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WO2018195984A1 - Procédé et dispositif d'envoi de préambule d'accès aléatoire - Google Patents

Procédé et dispositif d'envoi de préambule d'accès aléatoire Download PDF

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Publication number
WO2018195984A1
WO2018195984A1 PCT/CN2017/082578 CN2017082578W WO2018195984A1 WO 2018195984 A1 WO2018195984 A1 WO 2018195984A1 CN 2017082578 W CN2017082578 W CN 2017082578W WO 2018195984 A1 WO2018195984 A1 WO 2018195984A1
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Prior art keywords
symbol
symbol group
frequency
group
groups
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PCT/CN2017/082578
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English (en)
Chinese (zh)
Inventor
罗之虎
陈哲
金哲
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2017/082578 priority Critical patent/WO2018195984A1/fr
Priority to CN201780088127.5A priority patent/CN110419260B/zh
Publication of WO2018195984A1 publication Critical patent/WO2018195984A1/fr
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a method and a device for transmitting a random access preamble.
  • IoT Internet of Things
  • Typical IoT applications include possible applications including smart grid, smart agriculture, smart transportation, smart home, and environmental detection. Because the Internet of Things needs to be applied in a variety of scenarios, such as from the outdoors to the indoors, from the ground to the underground, there are many special requirements for the design of the Internet of Things. For example, where the wireless network signal is poor, there is a need for coverage enhancement.
  • Most IoT applications need to support a large number of low-rate devices and large-scale deployment of low-cost and low-energy devices.
  • IoT devices For applications targeting open areas, such as smart agriculture, animal husbandry monitoring, smart lakes (eg pollution monitoring, aquatic biomonitoring, etc.), the coverage level of IoT devices needs to meet larger cell radii.
  • NB-IoT Narrowband Internet of Things
  • SC-FDMA single-carrier frequency division multiple access
  • the user needs to perform a random access procedure before sending the uplink data, that is, the user needs to send the NB-IoT random access preamble on the random access channel.
  • An NB-IoT random access preamble consists of 4 symbol groups. One symbol group occupies one subcarrier, and one symbol group consists of a cyclic prefix CP and 5 symbols. The length of each symbol is NB-IoT uplink subcarrier. The reciprocal of the bandwidth.
  • the maximum cell radius supported by the NB-IoT is related to the guard time GT.
  • the larger the GT, the larger the radius of the largest cell covered, and the guard time GT is related to the time length T CP of the cyclic prefix and the time length T SEQ of 5 symbols. Therefore, the maximum cell radius supported by the NB-IoT is related to the format of the NB-IoT random access preamble and the subcarrier bandwidth supported by the NB-IoT .
  • the bandwidth of one NB-IoT carrier is 180 kHz, and the bandwidth of one subcarrier is 3.75 kHz.
  • the format of the NB-IoT random access preamble includes format 0 or format 1, format 0.
  • the time length T CP of the cyclic prefix of format 1 is different.
  • the maximum cell radius supported by format 0 is 10 km, and the maximum cell radius supported by format 1 is 40 km.
  • the maximum cell radius that the random access preamble can support exceeds 100 km.
  • NB-IoT In order to interface with LTE and multiplex the LTE site, NB-IoT also needs to meet the maximum cell radius supported by more than 100km.
  • the current random access preamble format of NB-IoT does not support such a large cell radius. Therefore, the new format of the random access preamble and the time-frequency resource configuration of the random access preamble transmitting the new format need to be designed to adapt to the maximum cell radius of the NB-IoT exceeding 100 km.
  • the embodiment of the present application provides a method and a device for transmitting a random access preamble, which are used to adapt to an application scenario in which the maximum cell radius of the NB-IoT is 100 km.
  • the application provides a method for sending a random access preamble, including:
  • the terminal device acquires random access configuration information sent by the network device, where the random access configuration information is used to indicate a format of the random access preamble;
  • the random access preamble is composed of L symbol groups, L is a positive integer greater than 4, and there is frequency hopping between each adjacent two of the symbol groups, and each of the symbol groups passes a subcarrier frequency.
  • the single-carrier transmission mode of the symbol group of the random access preamble has a lower peak average power than the PAPR, which helps to improve the performance of the entire system, and can simultaneously support more user multiplexing.
  • the frequency information of the random access preamble transmitting the new format is determined according to the new format and the random access configuration information corresponding to the new format, so that the terminal device can adapt the NB-IoT system to support a narrower subcarrier bandwidth and cover a larger cell.
  • the application scenario of the radius When the length of the cyclic prefix of the random access preamble in the new format and the length of time of all symbols increase, the protection time of the random access preamble increases, and the protection time of the random access preamble increases.
  • the NB-IoT system can adapt to the NB-IoT system to support narrower subcarrier bandwidth and cover larger cell radius, such as more than 100km.
  • the number of symbol groups included in the random access preamble is increased, which can transmit more service information, which is beneficial to improving the service capability of the entire NB-IoT system.
  • the L symbol groups are composed of N groups, each group includes 4 symbol groups, where N is a positive integer greater than or equal to 2; one of the N groups At least one hopping interval between the symbol groups is different from at least one hopping interval between the symbol groups of the other of the N groups.
  • the single-carrier frequency hopping mode is adopted, and the peak average power is lower than the PAPR, which helps to improve the performance of the entire system, and can simultaneously support more user multiplexing.
  • the features are conducive to simplifying the design.
  • the hopping interval may also be a narrower subcarrier bandwidth, such as 1.25 kHz, and further Can support larger cell radii, such as more than 100km.
  • the L symbol groups are composed of N groups, and one of the N groups includes m symbol groups, and m is a positive integer less than 4, in the N groups. All other groups include 4 symbol groups.
  • the single-carrier frequency hopping mode is adopted, and the peak average power is lower than the PAPR, which helps to improve the performance of the entire system, and can simultaneously support more user multiplexing.
  • the preset rule for determining the frequency point information includes multiple index expressions, where the index expression is a current symbol group, based on the foregoing two group division manners of the L symbol groups.
  • An index expression of a frequency point position the index expression is used to indicate a frequency hopping interval and a frequency hopping direction of the current symbol group with respect to a previous symbol group, and a frequency point position of the previous symbol group The index relationship between the symbol group index numbers of the current symbol group.
  • the preset rule and the method for determining the frequency point information are applicable to a scenario in which the hopping interval between all symbol groups is an integer multiple of the subcarrier bandwidth, compared with the prior art. Each symbol group has a large selection space with respect to the hopping interval of the previous symbol group, and can support more terminal device access.
  • the frequency point information is determined by:
  • the preset rule and the method for determining the frequency point information are applicable to a scenario in which the hopping interval between all symbol groups is an integer multiple of the subcarrier bandwidth, compared with the prior art.
  • Each symbol group has a large selection space with respect to the hopping interval of the previous symbol group, and can support more terminal device access.
  • the hopping interval between the symbol groups in the group is an integer multiple of the subcarrier bandwidth, if the hopping interval between the groups is also an integer multiple of the subcarrier bandwidth, when When the hopping interval is a narrower subcarrier bandwidth, such as 1.25 kHz, a larger cell radius can be supported, such as more than 100 km.
  • the preset rule for determining the frequency point information includes multiple index expressions, where the index expression is a current group, based on the foregoing two group division manners of the L symbol groups.
  • An index expression of a frequency point position of the current symbol group; the index expression is used to indicate a frequency hopping interval and a frequency hopping direction of the current symbol group with respect to a previous symbol group, and the previous symbol group The index position between the frequency point location and the symbol group index number of the current symbol group.
  • the preset rule and the method for determining frequency point information are applicable to a scheme in which a pseudo-random frequency hopping is adopted based on a frequency hopping interval between groups, and a frequency hopping interval between symbol groups in a group is an integer multiple of a subcarrier bandwidth.
  • a symbol group of a random access preamble (between groups) may also be determined by using a pseudo-random sequence, and the hopping interval of each symbol group in each group may be dynamically adjusted according to the pseudo-random sequence to reduce inter-cell interference. Conducive to increase system capacity and improve system performance.
  • the frequency point information is determined by:
  • Determining the current group according to a frequency point position of the first symbol group of the current group and a frequency hopping interval and a frequency hopping direction of each symbol group of the current group with respect to a previous symbol group. The frequency position of each symbol group.
  • the preset rule and the method for determining frequency point information are applicable to a scheme in which a pseudo-random frequency hopping is adopted based on a frequency hopping interval between groups, and a frequency hopping interval between symbol groups in a group is an integer multiple of a subcarrier bandwidth.
  • a symbol group of a random access preamble (between groups) may also be determined by using a pseudo-random sequence, and the hopping interval of each symbol group in each group may be dynamically adjusted according to a pseudo-random sequence, which is advantageous for reducing inter-cell spacing. Interference, increase system capacity, and improve system performance.
  • the initialization seed of the pseudo random sequence is a function of a physical layer cell identifier or a physical layer cell identifier of the terminal device.
  • the hopping interval between the symbol groups is at least two, and Any of the hopping intervals is an integer multiple of the subcarrier bandwidth.
  • the format of the random access preamble, including the time length of the cyclic prefix, and the time length of each symbol support a narrower subcarrier bandwidth
  • the hopping interval may also be a narrower subcarrier bandwidth, for example, 1.25 kHz, can support a larger cell radius, such as more than 100km.
  • the frequency hopping interval between the groups of the N groups is an integer multiple of a subcarrier bandwidth.
  • the hopping interval between the symbol groups in the group is an integer multiple of the subcarrier bandwidth
  • the hopping interval between the groups is also an integer multiple of the subcarrier bandwidth, when hopping
  • the frequency spacing is a narrower subcarrier bandwidth, such as 1.25 kHz, a larger cell radius can be supported.
  • the subcarrier bandwidth is 1.25 KHz.
  • the format of the random access preamble, including the length of the cyclic prefix, and the length of each symbol support a narrower subcarrier bandwidth, and the hopping interval can also be a narrower subcarrier bandwidth, such as 1.25 kHz, which can support A larger cell radius, such as more than 100km.
  • any group of the N groups including 4 symbol groups including 4 symbol groups:
  • the frequency hopping direction of the second symbol group in the group relative to the first symbol group is opposite to the frequency hopping direction of the fourth symbol group in the group with respect to the third symbol group;
  • the frequency spacing is equal; and the frequency hopping interval is smaller than a hopping interval of the third symbol group relative to the second symbol group.
  • a frequency hopping direction between the first symbol group and the second symbol group, and a frequency hopping between the third symbol group and the fourth symbol group The direction is reversed; the hopping interval between the first symbol group and the second symbol group is the same as the hopping interval between the third symbol group and the fourth symbol group, so that the differential accumulation method can eliminate
  • the reliability of the ToA estimation is improved due to the phase effect caused by the frequency offset.
  • the application provides a method for sending a random access preamble, including:
  • the network device sends random access configuration information to the terminal device, where the random access configuration information is used to indicate a format of the random access preamble;
  • the network device receives a random access preamble sent by the terminal device, where the random access preamble is sent by the terminal device according to the determined frequency point information according to the format, and the random access preamble is composed of L
  • the symbol group is composed, L is a positive integer greater than 4, and there is frequency hopping between each adjacent two of the symbol groups, and each of the symbol groups is transmitted by one subcarrier frequency, and the frequency point information includes the L
  • Each of the symbol groups corresponds to a frequency point, and the frequency point information is determined according to the random access configuration information and a preset rule.
  • the single-carrier transmission mode of the symbol group of the random access preamble has a lower peak average power than the PAPR, which helps to improve the performance of the entire system, and can simultaneously support more user multiplexing.
  • the frequency information of the random access preamble transmitting the new format is determined according to the new format and the random access configuration information corresponding to the new format, so that the terminal device can adapt the NB-IoT system to support a narrower subcarrier bandwidth and cover a larger cell.
  • the application scenario of the radius When the length of the cyclic prefix of the random access preamble in the new format and the length of time of all symbols increase, the protection time of the random access preamble increases, and the protection time of the random access preamble increases.
  • the NB-IoT system can adapt to the NB-IoT system to support narrower subcarrier bandwidth and cover larger cell radius, such as more than 100km.
  • the number of symbol groups included in the random access preamble is increased, which can transmit more service information, which is beneficial to improving the service capability of the entire NB-IoT system.
  • the L symbol groups are composed of N groups, and each group includes 4 symbol groups, where N is greater than Or a positive integer equal to 2; at least one hopping interval between symbol groups of one of the N groups, and at least one hop between the symbol groups of another group of the N groups
  • the frequency interval is different.
  • the single-carrier frequency hopping mode is adopted, and the peak average power is lower than the PAPR, which helps to improve the performance of the entire system, and can simultaneously support more user multiplexing.
  • the features are conducive to simplifying the design.
  • the hopping interval may also be a narrower subcarrier bandwidth, such as 1.25 kHz, and further Can support larger cell radii, such as more than 100km.
  • the L symbol groups are composed of N groups, and one of the N groups includes m symbol groups, and m is a positive integer less than 4, in the N groups. All other groups include 4 symbol groups.
  • the single-carrier frequency hopping mode is adopted, and the peak average power is lower than the PAPR, which helps to improve the performance of the entire system, and can simultaneously support more user multiplexing.
  • the preset rule used to determine the frequency point information includes multiple index expressions, where the index expression is a current symbol group, based on the foregoing two group division manners of the L symbol groups.
  • An index expression of a frequency point position the index expression is used to indicate a frequency hopping interval and a frequency hopping direction of the current symbol group with respect to a previous symbol group, and a frequency point position of the previous symbol group The index relationship between the symbol group index numbers of the current symbol group.
  • the preset rule and the method for determining the frequency point information are applicable to a scenario in which the hopping interval between all symbol groups is an integer multiple of the subcarrier bandwidth, compared with the prior art. Each symbol group has a large selection space with respect to the hopping interval of the previous symbol group, and can support more terminal device access.
  • the frequency point information is determined by:
  • the preset rule and the method for determining the frequency point information are applicable to a scenario in which the hopping interval between all symbol groups is an integer multiple of the subcarrier bandwidth, compared with the prior art.
  • Each symbol group has a large selection space with respect to the hopping interval of the previous symbol group, and can support more terminal device access.
  • the hopping interval between the symbol groups in the group is an integer multiple of the subcarrier bandwidth
  • the hopping interval between the groups is also an integer multiple of the subcarrier bandwidth
  • a larger cell radius can be supported, such as more than 100 km.
  • the preset rule used to determine the frequency point information includes multiple index expressions, where the index expression is a current group, based on the foregoing two group division manners of the L symbol groups.
  • the preset rule and the method for determining frequency point information are applicable to pseudo-random frequency hopping based on frequency hopping intervals between groups,
  • the hopping interval between symbol groups in a group is an integer multiple of the subcarrier bandwidth, compared with the prior art.
  • a symbol group of a random access preamble may also be determined by using a pseudo-random sequence, and the hopping interval of each symbol group in each group may be dynamically adjusted according to a pseudo-random sequence, which is advantageous for reducing inter-cell spacing. Interference, increase system capacity, and improve system performance.
  • the frequency point information is determined by:
  • the preset rule and the method for determining frequency point information are applicable to a scheme in which a pseudo-random frequency hopping is adopted based on a frequency hopping interval between groups, and a frequency hopping interval between symbol groups in a group is an integer multiple of a subcarrier bandwidth. Compared with the prior art.
  • a symbol group of a random access preamble may also be determined by using a pseudo-random sequence, and the hopping interval of each symbol group in each group may be dynamically adjusted according to a pseudo-random sequence, which is advantageous for reducing inter-cell spacing. Interference, increase system capacity, and improve system performance.
  • the initialization seed of the pseudo random sequence is a function of a physical layer cell identifier or a physical layer cell identifier of the terminal device.
  • the hopping interval between the symbol groups is at least two, and Any of the hopping intervals is an integer multiple of the subcarrier bandwidth.
  • the format of the random access preamble, including the time length of the cyclic prefix, and the time length of each symbol support a narrower subcarrier bandwidth
  • the hopping interval may also be a narrower subcarrier bandwidth, for example, 1.25 kHz, can support a larger cell radius, such as more than 100km.
  • the frequency hopping interval between the groups of the N groups is an integer multiple of a subcarrier bandwidth.
  • the hopping interval between the symbol groups in the group is an integer multiple of the subcarrier bandwidth
  • the hopping interval between the groups is also an integer multiple of the subcarrier bandwidth, when hopping
  • the frequency spacing is a narrower subcarrier bandwidth, such as 1.25 kHz, a larger cell radius can be supported, such as more than 100 km.
  • the subcarrier bandwidth is 1.25 KHz.
  • the format of the random access preamble, including the length of the cyclic prefix, and the length of each symbol support a narrower subcarrier bandwidth, and the hopping interval can also be a narrower subcarrier bandwidth, such as 1.25 kHz, which can support A larger cell radius, such as more than 100km.
  • any group of the N groups including 4 symbol groups including 4 symbol groups:
  • the frequency hopping direction of the second symbol group in the group relative to the first symbol group is opposite to the frequency hopping direction of the fourth symbol group in the group with respect to the third symbol group;
  • the frequency spacing is equal; and the frequency hopping interval is smaller than a hopping interval of the third symbol group relative to the second symbol group.
  • the jump between the first symbol group and the second symbol group Frequency direction, opposite to the frequency hopping direction between the third symbol group and the fourth symbol group; the frequency hopping interval between the first symbol group and the second symbol group, and the third symbol group and the fourth symbol group
  • the frequency hopping interval between the symbol groups is the same, so that the phase influence due to the frequency offset can be eliminated by the differential accumulation method, thereby improving the reliability of the ToA estimation.
  • the application provides a terminal device, where the terminal device includes a memory, a transceiver, and a processor, wherein: the memory is used to store an instruction; the processor is configured to execute an instruction stored in the memory, and Controlling the transceiver to perform signal reception and signal transmission, and when the processor executes the instruction stored in the memory, the terminal device is configured to perform the foregoing first aspect or any possible implementation manner of the first aspect The method described.
  • the application provides a network device, where the network device includes a memory, a transceiver, and a processor, where: the memory is used to store an instruction;
  • the processor is configured to control the transceiver to perform signal reception and signal transmission according to an instruction to execute the memory, and when the processor executes the instruction stored in the memory, the network device is configured to execute the foregoing The steps related to the network device in any of the possible implementations of the second aspect or the second aspect.
  • the present application provides a computer readable storage medium having instructions stored therein that, when run on a computer, cause the computer to perform any of the first aspect or the first aspect described above The method described in the implementation.
  • the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method described in the first aspect or any of the possible implementations of the first aspect.
  • the present application provides a computer readable storage medium having instructions stored therein that, when run on a computer, cause the computer to perform any of the foregoing second or second aspects The method described in the implementation.
  • the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method described in any of the second or second aspects of the above.
  • Multi-carrier frequency hopping scheme
  • the application provides a random access preamble sending method, including:
  • the terminal device acquires random access configuration information sent by the network device, where the random access configuration information is used to indicate a format of the random access preamble;
  • the random access preamble is composed of 4 symbol groups, and there is frequency hopping between each adjacent two symbol groups, and each of the symbol groups is sent by two or more subcarrier frequency points.
  • the frequency point information includes frequency points corresponding to the L symbol groups respectively.
  • the multi-carrier together frequency hopping scheme is designed to facilitate the utilization of existing resource configurations and save signaling overhead. For a terminal device with a good coverage level, a multi-carrier frequency hopping method can be adopted.
  • the format of the random access preamble, including the length of the cyclic prefix, and the length of each symbol support a narrower subcarrier bandwidth, and the hopping interval can also be a narrower subcarrier bandwidth, such as 1.25 kHz, which can support A larger cell radius, such as more than 100km.
  • the two subcarrier frequency points are adjacent frequency points, or at least two of the two or more subcarrier frequency points are adjacent frequency points, and at least two adjacent frequency points can ensure multiple sub-points.
  • the interval between carriers is small, for example, the sub-carrier bandwidth is 1.25 kHz, which is beneficial to accessing more terminal devices and improving system performance.
  • the relative positions of the two or more subcarrier frequency points distributed in the frequency domain direction are the same and are in a hop The frequency remains unchanged. If the relative positions of multiple subcarriers in a symbol group remain unchanged during frequency hopping, as long as the frequency position of one subcarrier in the symbol group is determined, the frequency position of other subcarriers may be offset according to the relative position. .
  • the hopping interval between each two adjacent symbol groups is an integer multiple of a subcarrier bandwidth, and the subcarrier bandwidth is 1.25 kHz.
  • the hopping interval supports a narrower subcarrier bandwidth, such as 1.25 kHz, which can accommodate NB-IoT systems to support narrower subcarrier bandwidths and cover larger cell radii, such as over 100 km, which in turn helps to improve NB-IoT systems. capacity.
  • the application provides a method for sending a random access preamble, including:
  • the terminal device acquires random access configuration information sent by the network device, where the random access configuration information is used to indicate a format of the random access preamble;
  • the terminal device sends a random access preamble to the network device according to the measured value of the random access configuration information and the reference signal received power, where the random access preamble includes L symbol groups.
  • L is a positive integer greater than or equal to 4, and there is a frequency hopping between each adjacent two of the symbol groups.
  • the random access preamble is selected according to the condition of the terminal device to be transmitted according to the single carrier or the multi-carrier method, that is, the terminal device selects the condition by itself.
  • the subcarrier frequency point transmits each symbol group of the random access preamble in the new format, or transmits each symbol group of the random access preamble in the new format through two or more subcarrier frequency points, which can balance both
  • the carrier scheme can improve resource utilization and save signaling overhead.
  • the single-carrier scheme can improve the performance of the entire system and realize the features of supporting more users at the same time.
  • the terminal device sends the random access preamble to the network device according to the measured value of the random access configuration information and the reference signal received power, including:
  • the sending manner is: sending each of the symbols by using a subcarrier frequency point Grouping, or transmitting each of the symbol groups by two or more subcarrier frequencies;
  • the terminal device sends a random access preamble to the network device according to the sending manner and the format.
  • the terminal device determines, according to the random access configuration information and the measured value of the received power of the reference signal, the sending manner of the random access preamble, including:
  • the terminal device determines a sending manner of the random access preamble according to the coverage level.
  • sending the random access preamble to the network device according to the sending manner and the format including:
  • the terminal device acquires a preset rule and random access configuration information corresponding to the sending mode according to the sending manner;
  • the terminal device sends a random access preamble to the network device according to the frequency point information according to the format.
  • the application provides a terminal device, where the terminal device includes a memory, a transceiver, and a processor.
  • the memory is configured to store an instruction
  • the processor is configured to control an instruction to store the memory according to an instruction to execute the memory, and control the transceiver to perform signal reception and signal transmission when the processor executes the instruction stored in the memory
  • the terminal device is configured to perform the method described in any of the possible implementations of the ninth aspect or the ninth aspect.
  • the present application provides a computer readable storage medium having stored therein instructions that, when run on a computer, cause the computer to perform any of the above ninth or ninth aspects The method described in the possible implementation.
  • the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any of the above-described ninth or ninth aspects.
  • the present application provides a terminal device, where the terminal device includes a memory, a transceiver, and a processor, wherein: the memory is used to store an instruction, and the processor is configured to execute an instruction stored in the memory according to an instruction. And controlling the transceiver to perform signal reception and signal transmission.
  • the terminal device is configured to perform any of the foregoing tenth or tenth aspects. Said method.
  • the present application provides a computer readable storage medium having stored therein instructions that, when run on a computer, cause the computer to perform any of the above tenth or tenth aspects The method described in the possible implementation.
  • the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method described in any of the above-described tenth or tenth aspects.
  • FIG. 1 is a system architecture diagram of a narrowband Internet of Things according to an embodiment of the present application
  • FIG. 2 is a schematic diagram of a frequency hopping pattern of a narrowband Internet of Things random access preamble in the prior art
  • FIG. 3 is a schematic structural diagram of a symbol group of a random access preamble of a narrowband Internet of Things in the prior art
  • FIG. 4 is a schematic diagram of a prior art narrowband Internet of Things random access preamble including a repetition frequency hopping pattern
  • FIG. 5 is a schematic structural diagram of a symbol group of a narrowband Internet of Things random access preamble according to an embodiment of the present disclosure
  • FIG. 6 is a flowchart of a method for transmitting a random access preamble of a narrowband Internet of Things according to an embodiment of the present disclosure
  • FIG. 7 is a schematic diagram of a single carrier frequency hopping pattern of a narrowband Internet of Things random access preamble according to an embodiment of the present disclosure
  • FIG. 8 is a schematic diagram of a single carrier frequency hopping pattern of a narrowband Internet of Things random access preamble according to an embodiment of the present disclosure
  • FIG. 9 is a schematic diagram of another single carrier frequency hopping pattern of a narrowband Internet of Things random access preamble according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic diagram of another single-carrier frequency hopping pattern of a narrowband Internet of Things random access preamble according to an embodiment of the present disclosure
  • FIG. 11 is a schematic diagram of a multi-carrier frequency hopping pattern of a narrowband Internet of Things random access preamble according to an embodiment of the present disclosure
  • FIG. 12 is a schematic structural diagram of a multi-carrier symbol group of a narrowband Internet of Things random access preamble in a frequency domain distribution direction according to an embodiment of the present disclosure
  • FIG. 13 is a schematic diagram of a multi-carrier frequency hopping pattern of a narrowband Internet of Things random access preamble according to an embodiment of the present disclosure
  • FIG. 14 is a schematic structural diagram of a single carrier symbol group of a narrowband Internet of Things random access preamble in a time distribution direction according to an embodiment of the present disclosure
  • 15 is a schematic structural diagram of a multi-carrier symbol group of a narrowband Internet of Things random access preamble in a time distribution direction according to an embodiment of the present disclosure
  • 16 is a schematic structural diagram of a repetition quantity of a random access preamble of a narrowband Internet of Things in a time distribution direction according to an embodiment of the present disclosure
  • FIG. 17 is a schematic diagram of a method for transmitting a random access preamble of a narrowband Internet of Things in a coexistence of a single carrier and a multicarrier scheme according to an embodiment of the present disclosure
  • FIG. 18 is a schematic structural diagram of a terminal device according to the present application.
  • FIG. 19 is a schematic structural diagram of a terminal device according to the present application.
  • FIG. 20 is a schematic structural diagram of a network device provided by the present application.
  • FIG. 21 is a schematic structural diagram of a network device according to the present application.
  • the present application is mainly applied to a Long Term Evolution (LTE) system or an Advanced Long Term Evolution (LTE-A) (LTE Advanced) system.
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution
  • LTE Advanced Long Term Evolution
  • the present application can also be applied to other communication systems, as long as there are entities in the communication system that can transmit information, and other entities can receive information.
  • New Radio (NR) system Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (Wideband Code Division Multiple) Access, WCDMA) System, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) system, Universal Mobile Telecommunications System (Universal Mobile Telecommunication System, UMTS), Evolved Long Term Evolution (eLTE) system, other mobile communication systems such as 5G.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • Wideband Code Division Multiple Access Wideband Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution
  • Universal Mobile Telecommunications System Universal Mobile Telecommunication System
  • eLTE Evolved Long Term Evolution
  • the network device and the terminal device 1 to the terminal device 6 constitute a communication system in which the network device and the terminal device 1 to the terminal device 6 can transmit data to each other. Further, the terminal device 4 to the terminal device 6 also constitute a communication system in which the terminal device 5 can transmit information to one or more of the terminal device 4 and the terminal device 6.
  • the uplink of the NB-IoT is intended to use the frequency division multiple access (SC-FDMA) technology.
  • SC-FDMA frequency division multiple access
  • the user needs to send uplink data.
  • the random access procedure is performed first. Specifically, before the terminal device sends the uplink data to the network device, the NB-IoT random access preamble needs to be sent on the random access channel according to the random access configuration information specified by the network device.
  • an NB-IoT random access preamble consists of 4 symbol groups, one symbol group occupies one subcarrier, and there is frequency hopping between the symbol groups, and the frequency domain position of each symbol group transmission is limited to 12 Within the subcarriers, the frequency domain hopping range is within 12 subcarriers, the subcarrier bandwidth is 3.75 kHz, the hopping interval between symbol groups is an integer multiple of the subcarrier bandwidth, and the minimum hopping interval is 3.75 kHz.
  • an NB-IoT random access preamble is composed of a symbol group 1, a symbol group 2, a symbol group 3, and a symbol group 4.
  • one symbol group includes one cyclic prefix CP and five symbols (symbols #0 to #4), the cyclic prefix has a time length of T CP , and the length of five symbols is T SEQ , each symbol A sequence is carried on, and the length of time of each symbol group is the reciprocal of the subcarrier bandwidth.
  • the NB-IoT random access preamble is repeatedly transmitted according to the number of repetitions of the network configuration.
  • four symbol groups of the random access preamble are represented by gray-filled rectangles and numbers, and are recorded as chronological order as the first, second, third, and fourth symbol groups.
  • the figure is represented by the numbers 1, 2, 3, 4.
  • the random access preamble has two frequency hopping intervals in one repetition period, which are 3.75 kHz and 22.5 kHz, respectively.
  • the frequency hopping interval between the first symbol group and the second symbol group is 3.75 kHz
  • the frequency hopping interval between the third symbol group and the fourth symbol group is 3.75 kHz.
  • the hopping interval between the second symbol group and the third symbol group is 22.5 kHz.
  • Pseudo-random frequency hopping is used between two adjacent repetition periods.
  • the elliptical dotted line is marked in the figure, and the frequency hopping range is also limited to 12 subcarriers.
  • the preamble currently supported by NB-IoT has two formats, where T CP is the length of a cyclic prefix, and T SEQ is the length of 5 symbols.
  • a terminal also called a User Equipment (UE) is a device that provides voice and/or data connectivity to a user, for example, a handheld device with a wireless connection function, an in-vehicle device, and the like.
  • UE User Equipment
  • Common terminals include, for example, mobile phones, tablets, notebook computers, PDAs, mobile internet devices (MIDs), wearable devices such as smart watches, smart bracelets, pedometers, and the like.
  • MIDs mobile internet devices
  • wearable devices such as smart watches, smart bracelets, pedometers, and the like.
  • the network device which may be a common base station (such as a Node B or an eNB), may be a new radio controller (NR controller), may be a gNode B (gNB) in a 5G system, may be centralized
  • a centralized unit which may be a new wireless base station, may be a radio remote module, may be a micro base station, may be a relay, may be a distributed network element, or may be a receiving point (Transmission) A reception point (TRP) or a transmission point (TP) or any other wireless access device, but the embodiment of the present application is not limited thereto.
  • Orthogonal Frequency Division Multiplexing OFDM
  • SCMA Sparse Code Multiplexing Access
  • filtered orthogonal frequency division multiplexing Filtered
  • the Orthogonal Frequency Division Multiplexing (F-OFDM) symbol and the Non-Orthogonal Multiple Access (NOMA) symbol may be determined according to actual conditions, and details are not described herein again.
  • System message which is cell-level information, is valid for all terminal devices accessing the cell, and each system message contains a set of parameters related to a certain function.
  • the system information block SIB2 is a type of system message, and mainly includes public radio resource configuration information, which is common to all UEs.
  • Subcarrier bandwidth The smallest granularity in the frequency domain.
  • the subcarrier width of one subcarrier is 15 kHz.
  • the subcarrier width of one subcarrier is 15 kHz, 3.75 kHz, and even narrower.
  • Multiple means two or more. "and/or”, describing the association relationship of the associated objects, indicating that there may be three relationships, for example, A and/or B, which may indicate that there are three cases where A exists separately, A and B exist at the same time, and B exists separately.
  • the character "/” generally indicates that the contextual object is an "or” relationship.
  • first, second, third, etc. may be used to describe various messages, requests, and terminals in the embodiments of the present application, these messages, requests, and terminals should not be limited to these terms. These terms are only used to distinguish messages, requests, and terminals from one another.
  • each symbol group includes a cyclic prefix CP (time length is T CP ) and a sequence, wherein the sequence includes E symbols, and the total length of the sequence is T SEQ , E is a positive integer greater than or equal to 1, and E can be 1, 2, 3, 4, 5, and the like.
  • the subcarrier bandwidth is narrower than the existing NB-IoT system, for example, the subcarrier bandwidth is 1.25 kHz, and the time length of each symbol is the reciprocal of the subcarrier bandwidth, the time length of each symbol will be prior art. 3 times, the length of the symbol increases, and the length of the cyclic prefix CP also increases. Therefore, in the new format, the time length T CP of the cyclic prefix and the time length T SEQ of all symbols are increased relative to the existing format 0 and format 1.
  • the present application provides a method for notifying a new format of a random access preamble, which specifically includes:
  • the terminal device receives random access configuration information sent by the network device, where the random access configuration information is used to indicate a format of the random access preamble.
  • the network device notifies the terminal device of the random access preamble by using a system message, such as SIB2. Enter configuration information.
  • the network device may randomize the radio, the Radio Resource Control (RRC) dedicated signaling, the Media Access Control (MAC) control element, or the Downlink Control Information (DCI).
  • RRC Radio Resource Control
  • MAC Media Access Control
  • DCI Downlink Control Information
  • the access configuration information is sent to the terminal device, and the random access configuration information is sent to the terminal device in other manners, which is not limited herein.
  • the random access configuration information includes a random access preamble format index or CP length, a random access resource period, a starting subcarrier frequency domain location, a number of subcarriers allocated for random access, a random access repetition number, and a random number.
  • the random access preamble format index or the CP length is used to indicate the format of the random access preamble.
  • the random access configuration information may include at least one parameter of the following parameters: a random access channel format, a subcarrier spacing, a length of a basic time unit T hop , and a random access channel.
  • a random access channel format a random access channel format
  • a subcarrier spacing a length of a basic time unit T hop
  • a random access channel a random access channel. The total length of time or the number of basic time units T hop .
  • the random access channel format is used to indicate whether the terminal device sends a random access signal by using a single carrier-based hopping interval or a multi-carrier based hopping interval.
  • the length of the basic time unit T hop is used to indicate the specific duration of a time unit.
  • the parameter is related to the basic parameters of the random access channel, which is not limited herein.
  • the total length of the random access channel or the number of basic time units T hop is used to indicate how long or how many time units the terminal device needs to transmit, and the parameter is related to the basic parameters of the random access channel. , specifically here is not limited.
  • the NB-IoT system supports a narrower subcarrier bandwidth and covers a larger cell radius.
  • the frequency hopping interval between the symbol groups of the random access preamble in the new format and the number of subcarriers limited during the hopping change.
  • the hopping interval is an integer multiple of the carrier.
  • the hopping interval that can be used is increased, and the hopping limit of the symbol group is increased from 12 subcarriers to 36 subcarriers.
  • the frequency hopping pattern between the symbol groups needs to be updated based on the increase of the number of subcarriers of the frequency hopping interval and the frequency hopping restriction.
  • the new format random access preamble can transmit more symbol groups in a repetition time, that is, a new format random access preamble, which can Includes at least 4 symbol groups.
  • the method for transmitting the random access preamble may be that each symbol group is sent by using a single carrier, or each symbol group is sent by using multiple carriers.
  • the present application provides three frequency hopping schemes: Frequency hopping scheme of random access preamble of carrier; frequency hopping scheme of random access preamble based on multi-carrier; frequency hopping scheme of random access preamble based on single carrier and multi-carrier coexistence.
  • the present application provides different methods for transmitting random access preambles. The method for transmitting the random access preamble provided by the present application is described in detail below in combination with each frequency hopping scheme:
  • the random access preamble consists of L symbol groups, L is a positive integer greater than 4, and each symbol group consists of 1 CP and E symbols, where E is a positive integer, one symbol
  • the duration is the reciprocal of the subcarrier bandwidth.
  • the format of each symbol group can be referred to Figure 5.
  • the sequence carried on each symbol in the symbol group may be the same.
  • the sequence carried on each symbol is a
  • the symbol group A and the symbol group B are recorded, and the first symbol of the symbol group A and the sequence of the first symbol of the symbol group B may be the same, and the symbol group A
  • the second symbol and the sequence carried on the second symbol of the symbol group B may be the same...
  • the Eth symbol of the symbol group A and the sequence carried by the Eth symbol of the symbol group B may be the same, such as the symbol group A and the symbol
  • the first symbol of symbol group A and the sequence of symbol group B may be different, and the symbol group A
  • the sequence of the second symbol and the second symbol of the symbol group B may be different.
  • the E-th symbol of the symbol group A and the sequence carried by the E-th symbol of the symbol group B may be different, for example, each symbol group A
  • the L symbol groups are divided into groups for every 4 symbol groups, including the following two methods:
  • the L symbol groups are composed of N groups, and each group includes 4 symbol groups, where N is a positive integer greater than or equal to 2.
  • the random access preamble is grouped into four groups of four symbol groups, and the groups are recorded in time series as group 1, group 2, ..., group N. Within each group, the symbol groups are recorded in chronological order as symbol group 1, symbol group 2, symbol group 3, and symbol group 4.
  • the frequency points of symbol group 1, symbol group 2, symbol group 3, and symbol group 4 are f 1k , f 2k , f 3k , f 4k , and the frequency hopping interval between symbol group 1 and symbol group 2 is ⁇ 1k , the symbol The frequency hopping interval between group 2 and symbol group 3 is ⁇ 2k , the frequency hopping interval between symbol group 3 and symbol group 4 is ⁇ 3k , and the random access preamble subcarrier bandwidth is ⁇ f, where k represents the group index.
  • the frequency hopping interval between the two groups is ⁇ g .
  • ⁇ 1 indicates the frequency hopping interval between group 1 and group 2
  • the relevant hopping intervals of group 1 and the frequency points of each symbol group are labeled in FIG.
  • the frequency position of each symbol group of the random access preamble can be expressed as:
  • the frequency of symbol group 1 is f 1k
  • the frequency of symbol group 1 is f 1k
  • the frequency of symbol group 1 is f 1k
  • the frequency of symbol group 1 is f 1k
  • the frequency of symbol group 1 is f 1k
  • the frequency of symbol group 1 is f 1k
  • the frequency of symbol group 1 is f 1k
  • the frequency of symbol group 1 is f 1k
  • any one of the N groups is at least two, and any one of the hopping intervals is an integer multiple of the subcarrier bandwidth.
  • the subcarrier bandwidth is 3.75/n KHz, where n is a positive integer greater than or equal to 2.
  • the subcarrier bandwidth is 1.25 KHz.
  • ⁇ 1k , ⁇ 2k and ⁇ 3k are integer multiples of the subcarrier bandwidth ⁇ f.
  • ⁇ 1k and ⁇ 3k are smaller than ⁇ 2k , and ⁇ 1k and ⁇ 3k ⁇ may be equal and may be unequal.
  • ⁇ 1k ⁇ 3k and less than ⁇ 2k .
  • At least one hopping interval between the symbol groups of one of the N groups is different from at least one hopping interval between the symbol groups of the other group of the N groups.
  • At least two groups p and q between different groups satisfy ⁇ 1p ⁇ ⁇ 1q , ⁇ 2p ⁇ ⁇ 2q , ⁇ 3p ⁇ ⁇ 3q .
  • f 1 (g+1) is the frequency point of the symbol group 1 of the latter group
  • f 4g is the frequency point of the symbol group 4 of the previous group.
  • the hopping interval between the groups of the N groups is an integer multiple of the subcarrier bandwidth.
  • Hopping interval between any two groups ⁇ g is an integer multiple of the subcarrier bandwidth ⁇ f, between different groups may be the same or may be different.
  • each group is determined according to the random access configuration information and the preset rule.
  • the frequency point information of the symbol group is determined by determining a subcarrier index number of the starting subcarrier according to the time-frequency resource configuration parameter included in the random access configuration information, and determining, according to the starting subcarrier a carrier index number, a symbol group index number of the first symbol group of the random access preamble, and a pseudo random sequence, determining a frequency point position of the first symbol group; determining according to the multiple index expressions a frequency hopping interval and a frequency hopping direction of each of the L symbol groups with respect to a previous symbol group; according to a frequency point position of the first symbol group and each symbol group relative to a previous symbol group The frequency hopping interval and the frequency hopping direction determine the frequency point positions of the L symbol groups.
  • the preset rule includes a plurality of index expressions, where the index expression is an index expression of a frequency point position of the current symbol group, and the index expression is used to indicate that the current symbol group is relative to a previous symbol.
  • pseudo-random frequency hopping is used between the two groups.
  • the frequency point information of each symbol group of each group is determined according to the random access configuration information and the preset rule, and the frequency point information is determined by: a time-frequency resource configuration parameter included in the random access configuration information, determining a sub-carrier index number of the starting sub-carrier; a sub-carrier index number of the starting sub-carrier, and a symbol of the first symbol group of the current group a group index number and a pseudo-random sequence, determining a frequency point position of the first symbol group of the current group; determining, according to the plurality of index expressions, each symbol group of the current group relative to a front Frequency hopping interval and frequency hopping direction of a symbol group; Determining the current group according to a frequency point position of the first symbol group of the current group and a frequency hopping interval and a frequency hopping direction of each symbol group of the current group with respect to a previous symbol group.
  • the preset rule includes a plurality of index expressions, where the index expression is an index expression of a frequency point position of the current symbol group, and the index expression is used to indicate that the current symbol group is relative to a previous symbol.
  • the pseudo random sequence c may be an m sequence, an M sequence, a gold sequence, or the like.
  • the initialization seed of the pseudo-random sequence c is a function of the cell identity or cell identity.
  • the frequency hopping direction of the second symbol group in the group relative to the first symbol group is opposite to the hopping direction of the fourth symbol group in the group with respect to the third symbol group;
  • There are two hopping intervals the hopping interval of the second symbol group relative to the first symbol group is equal to the hopping interval of the fourth symbol group in the group with respect to the third symbol group;
  • the hopping interval is smaller than the hopping interval of the third symbol group relative to the second symbol group.
  • the hopping direction of the second symbol group in the group relative to the first symbol group may be the same as the hopping direction of the third symbol group in the group with respect to the second symbol group, or may be different.
  • the hopping direction of the second symbol group relative to the first symbol group may be the same or different.
  • the hopping direction of the third symbol group relative to the second symbol group may be the same or different.
  • the hopping interval of the second symbol group relative to the first symbol group may be the same or different, and the hopping interval of the third symbol group relative to the second symbol group may be the same or different.
  • the 4N symbol groups of the random access preamble may be continuous or discontinuous in time, as shown in FIG. 14.
  • the different duplicate copies of the random access preamble may be consecutive in time, or may be For discontinuity, refer to Figure 16.
  • the single-carrier frequency hopping method has a low Peak to Average Power Ratio (PAPR) PAPR, which helps improve the performance of the entire system and can support more user multiplexing at the same time.
  • PAPR Peak to Average Power Ratio
  • each random access preamble is divided into multiple groups, and each group includes four symbol groups, so that the frequency hopping pattern of each group includes a frequency hopping interval and a frequency hopping direction. It can inherit the characteristics of the prior art and help simplify the design.
  • the format of the random access preamble including the time length of the cyclic prefix, and the time length of each symbol support a narrower subcarrier bandwidth
  • the hopping interval may also be a narrower subcarrier bandwidth, for example, 1.25 kHz, can support a larger cell radius.
  • the random access preamble consists of 8 symbol groups based on single carrier frequency hopping. 8 is two random access preambles (random access preamble #1 and random access preamble #2, indicating random access preambles transmitted by two different terminal devices at the same time, respectively represented by different padding
  • #0 to #35 in Fig. 8 represent 36 subcarriers, and the subcarrier bandwidth is 1.25 kHz.
  • Both the random access preamble #1 and the random access preamble #2 are composed of 8 symbol groups, and 8 symbol groups are regarded as 2 groups, and there are 4 symbol groups in each group.
  • Four hopping intervals are preset, 1.25 kHz, 7.5 kHz, 3.75 kHz, 22.5 kHz.
  • ⁇ 12 3.75 kHz
  • each group includes two different hopping intervals; secondly, the frequency hopping direction between the first symbol group and the second symbol group in group 1 is The hopping direction between the third symbol group and the fourth symbol group is reversed; again, the hopping interval between the first symbol group and the second symbol group in group 1 is the same as the third symbol group and The hopping interval between the fourth symbol groups is the same.
  • the hopping pattern shown in FIG. 8 has the advantage that the phase accumulation due to the frequency offset can be eliminated by differential accumulation, thereby improving the reliability of the ToA estimation.
  • the hopping interval between group 1 and group 2 is equal to the hopping interval between the second symbol group and the third symbol group in group 1, and a similar effect can be achieved.
  • the random access preamble #2 and the random access preamble #1 hopping pattern are mutually symmetric, and the frequency hopping interval between the eight symbol groups of the random access preamble #2, and random access
  • the frequency hopping interval between the eight symbol groups of the preamble #1 is the same in time, but the frequency hopping direction of the first symbol group and the second symbol group in the group 1 of the random access preamble #2, and The first symbol group in the group 1 of the random access preamble #1 is opposite to the frequency hopping direction of the second symbol group; the third symbol group and the fourth group in the group 1 of the random access preamble #2
  • the frequency hopping direction of the symbol group is opposite to the hopping direction of the third symbol group and the fourth symbol group in the group 1 of the random access preamble #1; the group 2 in the random access preamble #2
  • the frequency hopping direction of one symbol group and the second symbol group is opposite to the hopping direction of the first symbol group and the second symbol group in group 2 of the random access preamble #1; the random access preamble
  • the L symbol groups are composed of N groups, one of the N groups includes m symbol groups, m is a positive integer less than 4, and the other of the N groups Each group includes 4 symbol groups.
  • the random access preamble is illustrated by 4(N-1)+2 symbol groups based on single carrier frequency hopping.
  • N is a positive integer greater than 1, 4(N-1)+2
  • the symbol groups are divided into N groups.
  • Each symbol group consists of 1 CP and E symbols, where E is a positive integer and the duration of one symbol is the reciprocal of the subcarrier bandwidth.
  • Each symbol group occupies only one subcarrier, and there is frequency hopping between the symbol groups.
  • the 4 (N-1)+2 symbol groups of the random access preamble may be continuous or discontinuous in time.
  • the different repeated copies of the random access preamble may be continuous or discontinuous in time.
  • a frequency hopping pattern of a random access preamble composed of 4 (N-1) + 2 symbol groups will be introduced with some symbols.
  • the random access preamble is grouped by four symbol groups, and the groups are recorded in time series as group 0, group 1, group 2, ..., group N.
  • Group 0 represents two symbol groups.
  • symbol groups are recorded in chronological order as symbol group 1, symbol group 2, symbol group 3, and symbol group 4.
  • the frequency points of symbol group 1, symbol group 2, symbol group 3, and symbol group 4 are f 1k , f 2k , f 3k , f 4k , and the frequency hopping interval between symbol group 1 and symbol group 2 is ⁇ 1k , the symbol The frequency hopping interval between group 2 and symbol group 3 is ⁇ 2k , the frequency hopping interval between symbol group 3 and symbol group 4 is ⁇ 3k , and the random access preamble subcarrier bandwidth is ⁇ f, where k represents the group index.
  • the frequency hopping interval between the two groups is ⁇ g .
  • ⁇ 1 indicates the frequency hopping interval between group 1 and group 2
  • the symbol groups are recorded as symbol group 1 and symbol group 2 in chronological order.
  • the frequency of the symbol group 1, the symbol group 2 is f 10 , f 20
  • the frequency hopping interval between the symbol group 1 and the symbol group 2 is ⁇ 10
  • the frequency hopping interval between the group 0 and the group 1 is ⁇ 0 .
  • the figure below is a schematic diagram.
  • the relevant frequency hopping intervals of group 0 and group 1 and the frequency points of each symbol group are marked in Fig. 9.
  • the frequency position of each symbol group of the random access preamble in this embodiment may be expressed as:
  • the frequency of symbol group 1 is f 1k
  • the frequency of symbol group 1 is f 1k
  • the frequency of symbol group 1 is f 1k
  • the frequency of symbol group 1 is f 1k
  • the frequency of symbol group 1 is f 1k
  • the frequency of symbol group 1 is f 1k
  • the frequency of symbol group 1 is f 1k
  • each symbol group For group 0, the frequency position of each symbol group can be expressed as:
  • the frequency of symbol group 1 is f 10
  • the frequency of the symbol group 1 is f 10
  • the group other than the group 0 the hopping interval between the symbol groups is at least two, and any one of the hopping intervals is an integer multiple of the subcarrier bandwidth.
  • the subcarrier bandwidth is 3.75/n KHz, where n is a positive integer greater than or equal to 2.
  • the subcarrier bandwidth is 1.25 KHz.
  • ⁇ 10 , ⁇ 1k , ⁇ 2k and ⁇ 3k may be integer multiples of the subcarrier bandwidth ⁇ f.
  • ⁇ 10 , ⁇ 1k and ⁇ 3k are smaller than ⁇ 2k
  • ⁇ 10 , ⁇ 1k and ⁇ 3k may be equal and may be unequal.
  • ⁇ 1k ⁇ 3k and less than ⁇ 2k
  • At least one hopping interval between the symbol groups of one group and at least one hop between the symbol groups of the other group of the N groups The frequency interval is different.
  • at least two groups p and q between different groups satisfy ⁇ 1p ⁇ ⁇ 1q , ⁇ 2p ⁇ ⁇ 2q , ⁇ 3p ⁇ ⁇ 3q .
  • f 1 (g+1) is the frequency point of the symbol group 1 of the latter group
  • f 4g is the frequency point of the symbol group 4 of the previous group.
  • the hopping interval between the group 0 and the remaining N-1 groups is an integer multiple of the subcarrier bandwidth.
  • the frequency point information is determined by determining a subcarrier index number of the starting subcarrier according to the time-frequency resource configuration parameter included in the random access configuration information, and determining, according to the starting subcarrier a carrier index number, a symbol group index number of the first symbol group of the random access preamble, and a pseudo random sequence, determining a frequency point position of the first symbol group; determining according to the multiple index expressions a frequency hopping interval and a frequency hopping direction of each of the L symbol groups with respect to a previous symbol group; according to a frequency point position of the first symbol group and each symbol group relative to a previous symbol group The frequency hopping interval and the frequency hopping direction determine the frequency point positions of the L symbol groups.
  • the preset rule includes a plurality of index expressions, where the index expression is an index expression of a frequency point position of the current symbol group, and the index expression is used to indicate that the current symbol group is relative to a previous symbol.
  • the hopping interval ⁇ g between any two groups is an integer multiple of the subcarrier bandwidth ⁇ f, and the different groups may be the same or different.
  • pseudo-random frequency hopping is used between the two groups.
  • the frequency point information of each symbol group of each group is determined according to the random access configuration information and the preset rule.
  • the frequency point information is determined by determining a subcarrier index number of the starting subcarrier according to the time-frequency resource configuration parameter included in the random access configuration information, and according to the subcarrier index number of the starting subcarrier, a symbol group index number and a pseudo random sequence of the first symbol group of the current group, determining a frequency point position of the first symbol group of the current group; determining according to the multiple index expressions a frequency hopping interval and a frequency hopping direction of each symbol group of the current group with respect to a previous symbol group; a frequency point position of the first symbol group of the current group and the current group A frequency point position of each symbol group of the current group is determined by a frequency hopping interval and a frequency hopping direction of each symbol group with respect to a previous symbol group.
  • the preset rule includes a plurality of index expressions, where the index expression is an index expression of a frequency point position of the current symbol group, and the index expression is used to indicate that the current symbol group is relative to a previous symbol.
  • the pseudo random sequence c may be an m sequence, an M sequence, a gold sequence, or the like.
  • the initialization seed of the pseudo-random sequence c is a function of the cell identity or cell identity.
  • Pseudo-random frequency hopping can also be used between group 0 and group 1.
  • the frequency hopping direction of the second symbol group in the group relative to the first symbol group is opposite to the hopping direction of the fourth symbol group in the group with respect to the third symbol group;
  • There are two hopping intervals the hopping interval of the second symbol group relative to the first symbol group is equal to the hopping interval of the fourth symbol group in the group with respect to the third symbol group;
  • the hopping interval is smaller than the hopping interval of the third symbol group relative to the second symbol group.
  • the hopping direction of the second symbol group in the group relative to the first symbol group may be the same as the hopping direction of the third symbol group in the group with respect to the second symbol group, or may be different.
  • the hopping direction of the second symbol group relative to the first symbol group may be the same or different.
  • the hopping direction of the third symbol group relative to the second symbol group may be the same or different.
  • the hopping interval of the second symbol group relative to the first symbol group may be the same, or Differently, the hopping interval of the third symbol group relative to the second symbol group may be the same or different.
  • the 4N+2 symbol groups of the random access preamble may be continuous or discontinuous in time, as shown in FIG. 14.
  • the different duplicate copies of the random access preamble may be consecutive in time, or may be For discontinuity, refer to Figure 16.
  • the single-carrier frequency hopping method has a low Peak to Average Power Ratio (PAPR) PAPR, which helps improve the performance of the entire system and can support more user multiplexing at the same time.
  • PAPR Peak to Average Power Ratio
  • each random access preamble is divided into a plurality of groups, wherein one group includes less than 4 symbol groups, and each of the remaining groups includes 4 symbol groups, thus including 4 symbol groups.
  • the frequency hopping pattern of the group including the frequency hopping interval and the frequency hopping direction, can inherit the characteristics of the prior art and help simplify the design.
  • the format of the random access preamble including the time length of the cyclic prefix, and the time length of each symbol support a narrower subcarrier bandwidth
  • the hopping interval may also be a narrower subcarrier bandwidth, for example, 1.25 kHz, can support a larger cell radius.
  • the random access preamble consists of 6 symbol groups based on single carrier frequency hopping. 10 is two random access preambles (random access preamble #1 and random access preamble #2, indicating that random access preambles transmitted by two different terminal devices at the same time are respectively represented by different padding)
  • #0 to #35 in Fig. 10 indicate 36 subcarriers
  • the subcarrier bandwidth is 1.25 kHz.
  • the remaining groups include at least two different frequency hopping intervals; secondly, except group 0, the first symbol group and the second group of the remaining groups.
  • the frequency hopping direction between the symbol groups is opposite to the frequency hopping direction between the third symbol group and the fourth symbol group; again, except for group 0, the first symbol group and the second group of the remaining groups
  • the hopping interval between symbol groups is the same as the hopping interval between the third symbol group and the fourth symbol group.
  • the hopping patterns of the other groups can eliminate the phase influence due to frequency offset by differential accumulation, thereby improving the reliability of ToA estimation.
  • the hopping interval between groups is equal to the hopping interval between the second symbol group and the third symbol group of the group, and a similar effect can be achieved.
  • the random access preamble #2 and the random access preamble #1 hopping pattern are symmetric with each other, and the frequency hopping interval between the six symbol groups of the random access preamble #2, and random access
  • the hopping interval between the six symbol groups of preamble #1 is the same in time, but the frequency hopping direction of the first symbol group and the second symbol group in group 0 of the random access preamble #2, and The first symbol group in group 0 of random access preamble #1 is opposite to the frequency hopping direction of the second symbol group; the first symbol group and the second one in group 1 of random access preamble #2
  • the frequency hopping direction of the symbol group is opposite to the hopping direction of the first symbol group and the second symbol group in the group 1 of the random access preamble #1; the group 1 in the random access preamble #2
  • the frequency hopping direction of the three symbol groups and the fourth symbol group is opposite to the hopping direction of the third symbol group and the fourth symbol group in the group 1 of the random access preamble #1.
  • the method for transmitting a random access preamble is applied to the NB-IoT system, as shown in FIG. 6, the method for transmitting a random access preamble according to the foregoing two-carrier scheme. include:
  • Step S101 The terminal device acquires random access configuration information sent by the network device, where the random access configuration information is a format for indicating a random access preamble;
  • Step S102 The terminal device determines, according to the random access configuration information and a preset rule, frequency point information of a random access preamble sent to the network device, where the frequency point information includes the L symbol groups. Corresponding frequency points;
  • Step S103 The terminal device sends a random access preamble to the network device according to the frequency point information according to the format.
  • step S102 there are two schemes for determining the frequency point information of the random access preamble.
  • the terminal device and the network device pass the protocol, and the two parties agree on the following preset rules:
  • the preset rule includes a plurality of index expressions, where the index expression is an index expression of a frequency point position of a current symbol group, and the index expression is used to indicate that the current symbol group is relative to a previous symbol group.
  • the random access configuration information includes a time-frequency resource configuration parameter of a random access preamble, and the time-frequency resource configuration parameter includes at least a random access preamble format index or a CP length, a random access resource period, and a starting subcarrier frequency domain. Location, the number of subcarriers allocated for random access, the number of repetitions of random access, the start time of random access, the maximum number of retransmissions of random access preamble, and the RSRP threshold.
  • step S102 specifically includes:
  • the initialization seed of the pseudo random sequence is a function of a physical layer cell identifier or a physical layer cell identifier of the terminal device.
  • the actual frequency domain position of the i-th symbol group as n start is the common starting frequency domain location of the terminal device in the cell, For the frequency point of the ith symbol group determined by the terminal device according to the random access configuration information and the preset rule, According to this expression, the actual frequency domain position of the i-th symbol group is determined according to the frequency point of the i-th symbol group determined by the terminal device and the common starting frequency domain position.
  • n init is the MAC layer from The subcarrier selected in
  • the transmission limit for the random access preamble is limited to Within subcarriers. with a random access configuration parameter obtained by the terminal device from the network side, where Indicates the frequency domain location of the common starting subcarrier, Indicates the number of subcarriers allocated for random access.
  • the subcarrier bandwidth is configured to be 1.25 kHz, and the transmission of the random access preamble is limited.
  • the frequency hopping range between the symbol groups is within 36 subcarriers as an example to illustrate the frequency of the ith symbol group determined by the terminal device according to the random access configuration information and the preset rule. Specific example.
  • the random access preamble consists of 8 symbol groups based on single carrier frequency hopping.
  • the random access preamble consists of 8 symbol groups, and the hopping interval between the symbol groups is an integer multiple of the subcarrier bandwidth.
  • the index expression of the first row is used to represent an index expression of the frequency point position of the first symbol group, and the frequency position of the first symbol group is based on the subcarrier index number of the starting subcarrier.
  • the symbol group index numbers i and f(i/8) of the first symbol group of the random access preamble are determined, wherein the value of f(i/8) is based on a function f of the pseudo-random sequence c(n) (t) OK.
  • first line of the index expression is to the left of the equal sign Indicates the frequency position of the first symbol group, the index of the first line to the right of the equal sign The subcarrier index number of the starting subcarrier.
  • n init for the MAC layer from The subcarrier selected in Indicates the number of subcarriers allocated for random access included in the time-frequency resource configuration parameters.
  • the index expression of the second row to the 9th row is an index expression of the frequency point of the i-th symbol group, and the index expression of the frequency point of the i-th symbol group represents the i-th symbol group with respect to the i-1th
  • the first symbol group can be determined according to the hopping interval and the frequency hopping direction of the i-th symbol group with respect to the i-1th symbol group. The frequency position of each symbol group after that.
  • the pseudo-random sequence c(n) is a 31-long Gold sequence.
  • x 1 (n+31) (x 1 (n+3)+x 1 (n)) mod2
  • x 2 (n+31) (x 2 (n+3)+x 2 (n+2)+x 2 (n+1)+x 2 (n)) mod2
  • the random access preamble can be repeatedly transmitted at time.
  • the number of repetitions of the random access preamble is determined by the random access configuration parameters. Assume that the number of repetitions of the random access preamble is W, and W is a positive integer.
  • the random access preambles that are repeatedly transmitted are sequentially recorded as repeat 0, repeat 1, ... repeat W-1.
  • the foregoing multiple index expressions are used to calculate the frequency of the ith symbol group of the random access preamble transmitted when the configured repetition number is 1.
  • the above multiple index expressions are also applicable to calculating the frequency of the ith symbol group of the random access preamble whose number of repetitions is greater than one.
  • the random access preamble consists of 6 symbol groups based on single carrier frequency hopping.
  • the random access preamble consists of 6 symbol groups, and the hopping interval between the symbol groups is an integer multiple of the subcarrier bandwidth.
  • the index expression of the first row is used to represent an index expression of the frequency point position of the first symbol group, and the frequency position of the first symbol group is based on the subcarrier index number of the starting subcarrier.
  • the symbol group index numbers i and f(i/6) of the first symbol group of the random access preamble are determined, wherein the value of f(i/6) is based on a function f of the pseudo-random sequence c(n) (t) OK.
  • first line of the index expression is to the left of the equal sign Indicates the frequency position of the first symbol group, the index of the first line to the right of the equal sign The subcarrier index number of the starting subcarrier.
  • n init for the MAC layer from The subcarrier selected in Indicates the number of subcarriers allocated for random access included in the time-frequency resource configuration parameters.
  • the index expression of the second row to the seventh row is an index expression of the frequency point of the i-th symbol group, and the index expression of the frequency point of the i-th symbol group represents the i-th symbol group with respect to the i-1th
  • the first symbol group can be determined according to the hopping interval and the frequency hopping direction of the i-th symbol group with respect to the i-1th symbol group. The frequency position of each symbol group after that.
  • the pseudo-random sequence c(n) is a 31-long Gold sequence.
  • x 1 (n+31) (x 1 (n+3)+x 1 (n)) mod2
  • x 2 (n+31) (x 2 (n+3)+x 2 (n+2)+x 2 (n+1)+x 2 (n)) mod2
  • the random access preamble can be sent repeatedly at the time.
  • the number of repetitions of the random access preamble is determined by the random access configuration parameters. Assume that the number of repetitions of the random access preamble is W, and W is a positive integer.
  • the random access preambles that are repeatedly transmitted are sequentially recorded as repeat 0, repeat 1, ... repeat W-1.
  • the foregoing multiple index expressions are used to calculate the frequency of the ith symbol group of the random access preamble with the number of repetitions of 1 transmitted.
  • a pseudo-random frequency hopping based on the frequency hopping interval between groups, and the hopping interval between the symbol groups in the group is an integer multiple of the subcarrier bandwidth.
  • the pseudo-random frequency hopping is used for the hopping interval between the groups, and the hopping interval between the symbol groups in the group is an integer multiple of the sub-carrier bandwidth.
  • the terminal device and the network device pass the protocol, and the two parties agree on the following presets. rule:
  • the preset rule includes a plurality of index expressions, where the index expression is an index expression of a frequency point position of a current symbol group in a current group; the index expression is used to indicate that the current symbol group is relative to The indexing relationship between the frequency hopping interval and the frequency hopping direction of the previous symbol group, the frequency point position of the previous symbol group, and the symbol group index number of the current symbol group.
  • the random access configuration information includes a time-frequency resource configuration parameter of a random access preamble, and the time-frequency resource configuration parameter includes at least a random access preamble format index or a CP length, a random access resource period, and a starting subcarrier frequency domain. Location, the number of subcarriers allocated for random access, the number of repetitions of random access, the start time of random access, the maximum number of retransmissions of random access preamble, and the RSRP threshold.
  • the step S102 specifically includes:
  • Determining the current group according to a frequency point position of the first symbol group of the current group and a frequency hopping interval and a frequency hopping direction of each symbol group of the current group with respect to a previous symbol group. The frequency position of each symbol group.
  • the initialization seed of the pseudo random sequence is a function of a physical layer cell identifier or a physical layer cell identifier of the terminal device.
  • the actual frequency domain position of the i-th symbol group as n start is the common starting frequency domain location of the terminal device in the cell, For the frequency point of the ith symbol group determined by the terminal device according to the random access configuration information and the preset rule, According to this expression, the actual frequency domain position of the i-th symbol group is determined according to the frequency point of the i-th symbol group determined by the terminal device and the common starting frequency domain position.
  • n init is the MAC layer from The subcarrier selected in
  • the transmission limit for the random access preamble is limited to Within subcarriers. with a random access configuration parameter obtained by the terminal device from the network side, where Indicates the frequency domain location of the common starting subcarrier, Indicates the number of subcarriers allocated for random access.
  • the subcarrier bandwidth is configured to be 1.25 kHz, and the transmission of the random access preamble is limited.
  • the frequency hopping range between the symbol groups is within 36 subcarriers as an example to illustrate the frequency of the ith symbol group determined by the terminal device according to the random access configuration information and the preset rule. Specific example.
  • the random access preamble consists of 8 symbol groups based on single carrier frequency hopping.
  • the random access preamble consists of 8 symbol groups.
  • the frequency hopping interval between the symbol groups in the group is an integer multiple of the subcarrier bandwidth, and the frequency hopping interval between the groups adopts pseudo random frequency hopping.
  • the index expression of the first row is used to represent an index expression of the frequency point position of the first symbol group in the current group, and the frequency position of the first symbol group in the group is based on the subcarrier of the starting subcarrier.
  • the index number The symbol group index numbers i and f(i/4) of the first symbol group in the current group of the transmitted random access preamble are determined, wherein the value of f(i/4) is based on the pseudo-random sequence c ( The function f(t) of n) is determined.
  • first line of the index expression is to the left of the equal sign Indicates the frequency position of the first symbol group in the current group, the index of the first line to the right of the equal sign The subcarrier index number of the starting subcarrier within the current group.
  • the subcarrier index number of the starting subcarrier in the current group is satisfied.
  • n init for the MAC layer from The subcarrier selected in Indicates the number of subcarriers allocated for random access included in the time-frequency resource configuration parameters.
  • the index expressions of the second row to the ninth row are index expressions of the frequency points of the i-th symbol group in the current group, and the index expression of the frequency points of the i-th symbol group indicates the number in the current group.
  • the frequency hopping interval and frequency hopping direction of the i symbol group relative to the i-1th symbol group in the current group, the frequency point position of the i-1th symbol group in the current group, and the current group group The index relationship between the symbol group index numbers of the i-th symbol group. According to the index expressions of the second row to the ninth row, the hop interval and the hopping direction of the i-th symbol group in the current group with respect to the i-1th symbol group in the current group can be determined.
  • the frequency position of each symbol group after the first symbol group in the current group can be determined.
  • the pseudo-random sequence c(n) is a 31-long Gold sequence.
  • x 1 (n+31) (x 1 (n+3)+x 1 (n)) mod2
  • x 2 (n+31) (x 2 (n+3)+x 2 (n+2)+x 2 (n+1)+x 2 (n)) mod2
  • the random access preamble can be sent repeatedly at the time.
  • the number of repetitions of the random access preamble is determined by the random access configuration parameters. Assume that the number of repetitions of the random access preamble is W, and W is a positive integer.
  • the random access preambles that are repeatedly transmitted are sequentially recorded as repeat 0, repeat 1, ... repeat W-1.
  • the multiple index expressions are used to calculate the frequency of the i-th symbol group in the current group of the random access preamble whose repetition number is configured to 1.
  • the above multiple index expressions are also applicable to calculating the frequency of the i-th symbol group in the current group of the random access preamble whose number of repetitions is greater than or equal to 1. For example, when the number of repetitions is configured to be 2, when determining the frequency position of the first symbol group in the current group of the repeat 0, the first expression in the first group of 0 is repeated for the index expression of the first line.
  • the random access preamble consists of 6 symbol groups based on single carrier frequency hopping.
  • the random access preamble is composed of 6 symbol groups, and the frequency hopping interval between the symbol groups in the group is an integer multiple of the subcarrier bandwidth, and the frequency hopping interval between the groups adopts pseudo random frequency hopping.
  • the index expression of the first line is used to represent the index expression of the frequency point position of the first symbol group in the first group, and the frequency position of the first symbol group in the first group is based on the start Subcarrier index number of subcarrier
  • the symbol group index numbers i and f(2*i/6) of the first symbol group in the current group of the transmitted random access preamble are determined, wherein the value of f(2*i/6) is based on the pseudo
  • the function f(t) of the random sequence c(n) is determined.
  • first line of the index expression is to the left of the equal sign Indicates the frequency position of the first symbol group in the current group, the index of the first line to the right of the equal sign The subcarrier index number of the starting subcarrier within the current group.
  • the subcarrier index number of the starting subcarrier in the current group is satisfied.
  • n init for the MAC layer from The subcarrier selected in Indicates the number of subcarriers allocated for random access included in the time-frequency resource configuration parameters.
  • the index expression of the second row is used to represent the index expression of the frequency point position of the first symbol group in the second group, and the frequency position of the first symbol group in the second group is based on the start Subcarrier index number of subcarrier
  • the subcarrier index number of the starting subcarrier in the current group is satisfied.
  • n init for the MAC layer from The subcarrier selected in Indicates the number of subcarriers allocated for random access included in the time-frequency resource configuration parameters.
  • the index expression of the third row to the sixth row is an index expression of the frequency point of the i-th symbol group in the current group, and the index expression of the frequency point of the i-th symbol group indicates the current group
  • the frequency hopping interval and frequency hopping direction of the i-th symbol group relative to the i-1th symbol group in the current group, and the frequency point position of the i-1th symbol group in the current group, within the current group The index relationship between the symbol group index numbers of the i-th symbol group.
  • the hop interval and the hopping direction of the i-th symbol group in the current group with respect to the i-1th symbol group in the current group may be determined.
  • the frequency position of each symbol group after the first symbol group in the current group can be determined.
  • the pseudo-random sequence c(n) is a 31-long Gold sequence.
  • x 1 (n+31) (x 1 (n+3)+x 1 (n)) mod2
  • x 2 (n+31) (x 2 (n+3)+x 2 (n+2)+x 2 (n+1)+x 2 (n)) mod2
  • the random access preamble can be sent repeatedly at the time.
  • the number of repetitions of the random access preamble is determined by the random access configuration parameters. Assume that the number of repetitions of the random access preamble is W, and W is a positive integer.
  • the random access preambles that are repeatedly transmitted are sequentially recorded as repeat 0, repeat 1, ... repeat W-1.
  • the multiple index expressions are used to calculate the frequency of the i-th symbol group in the current group of the random access preamble when the number of repetitions is configured to 1.
  • the above multiple index expressions are also applicable to calculating the frequency of the i-th symbol group in the current group of the random access preamble whose transmission repetition number is greater than one. For example, if the number of repetitions is set to 2, when determining the frequency position of the first symbol group in the first group of the repetition 0, the symbol group index number of the first symbol group in the first group of 0 is repeated.
  • the present application provides a method for sending a random access preamble, which is applied to a network device side, and specifically includes:
  • the network device sends random access configuration information to the terminal device, where the random access configuration information is used to indicate a format of the random access preamble;
  • the network device receives a random access preamble sent by the terminal device, where the random access preamble is sent by the terminal device according to the determined frequency point information according to the format, and the random access preamble is composed of L
  • the symbol group is composed, L is a positive integer greater than 4, and there is frequency hopping between each adjacent two of the symbol groups, and each of the symbol groups is transmitted by one subcarrier frequency, and the frequency point information includes the L
  • Each of the symbol groups corresponds to a frequency point, and the frequency point information is determined according to the random access configuration information and a preset rule.
  • the L symbol groups are composed of N groups, each group includes 4 symbol groups, where N is a positive integer greater than or equal to 2; one of the N groups At least one hopping interval between the symbol groups is different from at least one hopping interval between the symbol groups of the other of the N groups.
  • the L symbol groups are composed of N groups, and one of the N groups includes m symbol groups, and m is a positive integer less than 4, in the N groups. All other groups include 4 symbol groups.
  • the preset rule used to determine the frequency point information includes multiple index expressions, where the index expression is a current symbol group, based on the foregoing two group division manners of the L symbol groups.
  • An index expression of a frequency point position the index expression is used to indicate a frequency hopping interval and a frequency hopping direction of the current symbol group with respect to a previous symbol group, and a frequency point position of the previous symbol group The index relationship between the symbol group index numbers of the current symbol group.
  • the frequency point information is determined by:
  • the preset rule used to determine the frequency point information includes multiple index expressions, where the index expression is a current group, based on the foregoing two group division manners of the L symbol groups.
  • An index expression of a frequency point position of the current symbol group; the index expression is used to indicate a frequency hopping interval and a frequency hopping direction of the current symbol group with respect to a previous symbol group, and the previous symbol group The index position between the frequency point location and the symbol group index number of the current symbol group.
  • the frequency point information is determined by:
  • Determining the current group according to a frequency point position of the first symbol group of the current group and a frequency hopping interval and a frequency hopping direction of each symbol group of the current group with respect to a previous symbol group. The frequency position of each symbol group.
  • the initialization seed of the pseudo random sequence is a function of a physical layer cell identifier or a physical layer cell identifier of the terminal device.
  • the hopping interval between the symbol groups is at least two, and Any of the hopping intervals is an integer multiple of the subcarrier bandwidth.
  • the frequency hopping interval between the groups of the N groups is an integer multiple of a subcarrier bandwidth.
  • the subcarrier bandwidth is 1.25 KHz.
  • any group of the N groups including 4 symbol groups including 4 symbol groups:
  • the frequency hopping direction of the second symbol group in the group relative to the first symbol group is opposite to the frequency hopping direction of the fourth symbol group in the group with respect to the third symbol group;
  • the frequency spacing is equal; and the frequency hopping interval is smaller than a hopping interval of the third symbol group relative to the second symbol group.
  • the random access preamble is composed of four symbol groups, and the single-carrier frequency hopping mode is adopted, and the hopping interval may be smaller than the sub-carrier bandwidth.
  • the subcarrier bandwidth is 3.75 kHz
  • the four symbol groups are chronologically recorded as symbol group 1, symbol group 2, symbol group 3, symbol group 4, symbol group 1 and symbol group 2 with a frequency hopping interval of 1.25 kHz
  • symbol group 2 and symbol group 3 have a frequency hopping interval of 22.5 kHz
  • symbol group 3 and symbol group 4 have a frequency hopping interval of 1.25 kHz.
  • the frequency hopping direction of symbol group 1 and symbol group 2 is opposite to the frequency hopping direction of symbol group 3 and symbol group 4.
  • the specific content of the single-carrier scheme applied to the network device side can be mutually referenced with the single-carrier scheme applied to the terminal device side, and is not described here.
  • the random access preamble is composed of 4 symbol groups, each symbol group is composed of 1 CP and E symbols, where E is a positive integer, and the duration of one symbol is a subcarrier bandwidth.
  • the format of each symbol group can be referred to Figure 5.
  • two or more subcarriers occupied by each symbol group may be continuous or discontinuous, as shown in FIG.
  • the two subcarrier frequency points are adjacent frequency points, or at least two of the two or more subcarrier frequency points are adjacent frequency points.
  • the four symbol groups of the random access preamble may be continuous or discontinuous in time, as shown in FIG.
  • the different repeated copies of the random access preamble may be continuous or discontinuous in time, see FIG.
  • the relative positions of the two or more subcarrier frequency points distributed in the frequency domain direction are the same and remain unchanged during the frequency hopping process. If the relative positions of multiple subcarriers in a symbol group remain unchanged during frequency hopping, as long as the frequency position of one subcarrier in the symbol group is determined, the frequency position of other subcarriers may be offset according to the relative position. .
  • the hopping interval between each two adjacent symbol groups is an integer multiple of a subcarrier bandwidth, and the subcarrier bandwidth is 1.25 kHz.
  • symbol groups are recorded in chronological order as symbol group 1, symbol group 2, symbol group 3, and symbol group 4.
  • the number of subcarriers in a symbol group is N, and N is a positive integer greater than 2. At least two subcarriers in the multicarrier are adjacent subcarriers.
  • the frequency points of the kth subcarrier of symbol group 1, symbol group 2, symbol group 3, and symbol group 4, the frequency points are f 1k , f 2k , f 3k , f 4k , the kth subcarrier and symbol group in symbol group 1
  • the frequency hopping interval between the kth subcarriers in 2 is ⁇ 1k
  • the frequency hopping interval between the kth subcarrier in symbol group 2 and the kth subcarrier in symbol group 3 is ⁇ 2k
  • the frequency hopping interval between the kth subcarrier in the carrier and symbol group 4 is ⁇ 3k
  • the multicarriers are labeled as low, high, as 1, 2, 3.
  • the frequency hopping of subcarrier 1 is labeled in FIG.
  • the frequency position of each symbol group of the random access preamble can be expressed as:
  • the frequency of the kth subcarrier of symbol group 1 is f 1k
  • the frequency of the kth subcarrier of symbol group 3 f 3k f 2k + ⁇ 2k
  • the frequency of the kth subcarrier of symbol group 1 is f 1k
  • the frequency of the kth subcarrier of symbol group 3 f 3k f 2k + ⁇ 2k
  • the frequency of the kth subcarrier of symbol group 1 is f 1k
  • the frequency of the kth subcarrier of symbol group 3 f 3k f 2k - ⁇ 2k
  • the frequency of the kth subcarrier of symbol group 1 is f 1k
  • the frequency of the kth subcarrier of symbol group 3 f 3k f 2k - ⁇ 2k
  • the frequency of the kth subcarrier of symbol group 1 is f 1k
  • the frequency of the kth subcarrier of symbol group 3 f 3k f 2k + ⁇ 2k
  • the frequency of the kth subcarrier of symbol group 1 is f 1k
  • the frequency of the kth subcarrier of symbol group 3 f 3k f 2k + ⁇ 2k
  • the frequency of the kth subcarrier of symbol group 1 is f 1k
  • the frequency of the kth subcarrier of symbol group 3 f 3k f 2k - ⁇ 2k
  • the frequency of the kth subcarrier of symbol group 1 is f 1k
  • the frequency of the kth subcarrier of symbol group 3 f 3k f 2k - ⁇ 2k
  • the hopping interval between the symbol groups is at least two, and any one of the hopping intervals is an integer multiple of a subcarrier bandwidth.
  • the subcarrier bandwidth is 3.75/n KHz, where n is a positive integer greater than or equal to 2.
  • the subcarrier bandwidth is 1.25 KHz.
  • ⁇ 1k , ⁇ 2k and ⁇ 3k are integer multiples of the subcarrier bandwidth ⁇ f.
  • ⁇ 1k and ⁇ 3k are smaller than ⁇ 2k , and ⁇ 1k and ⁇ 3k ⁇ may be equal and may be unequal.
  • ⁇ 1k ⁇ 3k .
  • ⁇ 1k ⁇ 3k and less than ⁇ 2k .
  • the frequency hopping direction of the second symbol group relative to the first symbol group is opposite to the frequency hopping direction of the fourth symbol group with respect to the third symbol group; wherein, the second The frequency hopping direction of the symbol group with respect to the first symbol group may be the same as or different from the frequency hopping direction of the third symbol group with respect to the second symbol group.
  • the base sequence carried on the N sub-carriers in each symbol group should preferably have a smaller PAPR sequence.
  • Each symbol in each subcarrier carries the same sequence, which may be the same or different.
  • the sequence carried on each subcarrier in the symbol group may be the same.
  • the sequence carried on each subcarrier is a
  • the symbols on the first subcarrier of symbol group A and the symbols on the first subcarrier of symbol group B may be the same.
  • the symbol on the second subcarrier of symbol group A and the symbol on the second subcarrier of symbol group B may be the same... the symbol on the Eth subcarrier of symbol group A and the Eth subcarrier of symbol group B
  • the sequence carried on the symbol on the symbol may be the same.
  • the sequence carried by the symbol on each subcarrier on the symbol group A and the symbol group B is a
  • a may be a real number, such as 1 or -1
  • a may also be a complex number.
  • j or -j, where j represents an imaginary unit and satisfies j 2 -1.
  • the symbols on the first subcarrier of symbol group A and the sequences carried on the symbols on the first subcarrier of symbol group B may be Different, the symbol on the second subcarrier of symbol group A and the sequence on the symbol on the second subcarrier of symbol group B may be different... the symbol on the Eth subcarrier of symbol group A and the Eth of symbol group B
  • the sequence carried on the symbols on the subcarriers may be different.
  • the sequence carried by the symbols on each subcarrier in the symbol group A is a
  • a may be a real number, such as 1 or -1
  • the sequence carried on each subcarrier within a symbol group can be different.
  • the sequence carried on three subcarriers in each symbol group may be a NB-IoT3-tone Demodulation Reference Signal (DMRS) sequence.
  • DMRS Demodulation Reference Signal
  • the set of values of ⁇ is ⁇ 0, 2 ⁇ /3, 4 ⁇ /3 ⁇ .
  • ⁇ can be notified by system message, RRC signaling, MAC Control Element (CE), or by Downlink Control Information (DCI).
  • system message RRC signaling, MAC Control Element (CE), or by Downlink Control Information (DCI).
  • CE MAC Control Element
  • DCI Downlink Control Information
  • a multi-carrier frequency hopping manner may be adopted for a terminal device with a good coverage level.
  • the format of the random access preamble includes the length of the cyclic prefix, and the symbol of each symbol.
  • the length of time supports a narrower subcarrier bandwidth
  • the hopping interval can also be a narrower subcarrier bandwidth, such as 1.25 kHz, which can support a larger cell radius.
  • the frequency hopping direction between the first symbol group and the second symbol group is opposite to the frequency hopping direction between the third symbol group and the fourth symbol group; the first symbol group and the second symbol group
  • the hopping interval between the symbol groups is the same as the hopping interval between the third symbol group and the fourth symbol group, so that the phase addition due to the frequency offset can be eliminated by differential accumulation, thereby improving ToA estimates the reliability.
  • the pattern of the frequency hopping of each subcarrier is the same as the existing frequency hopping pattern, and the characteristics of the existing frequency hopping pattern can be inherited.
  • the multi-carrier together frequency hopping scheme is designed to facilitate the utilization of existing resource configurations and save signaling overhead.
  • the present application provides a method for transmitting a random access preamble according to a multi-carrier scheme, where the random access preamble transmission method is applied to a NB-IoT system, and is applied to a terminal device, where the method includes:
  • the terminal device acquires random access configuration information sent by the network device, where the random access configuration information is used to indicate a format of the random access preamble;
  • the frequency point information includes corresponding to the L symbol groups respectively Frequency;
  • the terminal device sends a random access preamble to the network device according to the frequency point information according to the format.
  • the hopping interval between the four symbol groups is an integer multiple of the sub-carrier bandwidth.
  • the preset rule includes a plurality of index expressions, where the index expression is an index expression of a frequency point position of a current symbol group, and the index expression is used to indicate that the current symbol group is relative to a previous symbol group.
  • the random access configuration information includes a time-frequency resource configuration parameter of a random access preamble, and the time-frequency resource configuration parameter includes at least a random access preamble format index or a CP length, a random access resource period, and a starting subcarrier frequency domain. Location, the number of subcarriers allocated for random access, the number of repetitions of random access, the start time of random access, random access The maximum number of retransmissions of the preamble, the RSRP threshold, and so on.
  • the initialization seed of the pseudo random sequence is a function of a physical layer cell identifier or a physical layer cell identifier of the terminal device.
  • n start is the common starting frequency domain location of the terminal device in the cell
  • the actual frequency domain position of the kth subcarrier of the i th symbol group is determined according to the frequency point of the i th symbol group determined by the terminal device and the common starting frequency domain position.
  • n init is the MAC layer from The subcarrier selected in
  • the transmission limit for the random access preamble is limited to Within subcarriers. with a random access configuration parameter obtained by the terminal device from the network side, where Indicates the frequency domain location of the common starting subcarrier, Indicates the number of subcarriers allocated for random access.
  • the following is a random access preamble consisting of four symbol groups based on multi-carrier frequency hopping.
  • the hopping interval between symbol groups is an integer multiple of the sub-carrier bandwidth, and the sub-carrier bandwidth is configured to be 1.25 kHz, and the random access preamble is used.
  • Transmission limit In the subcarriers the frequency hopping range between the symbol groups is within 36 subcarriers as an example to illustrate the frequency of the kth subcarrier of the ith symbol group determined by the terminal device according to the random access configuration information and the preset rule. Specific example.
  • the frequency position of the kth subcarrier of the i-th symbol group Determined by the following multiple index expressions:
  • the index expression of the first row is used to represent an index expression of the frequency position of the kth subcarrier of the first symbol group, and the frequency position of the kth subcarrier of the first symbol group is based on the starting subcarrier.
  • Subcarrier index number The symbol group index numbers i and f(i/4) of the kth subcarrier of the first symbol group of the random access preamble are determined, wherein the value of f(i/4) is based on a pseudo random sequence c ( The function f(t) of n) is determined.
  • first line of the index expression is to the left of the equal sign Indicates the frequency position of the kth subcarrier of the first symbol group, the index of the first line to the right of the equal sign The subcarrier index number of the starting subcarrier.
  • n init for the MAC layer from The subcarrier selected in Indicates the number of subcarriers allocated for random access included in the time-frequency resource configuration parameters.
  • the frequency position of the kth subcarrier of the first symbol group is determined, according to the hop interval and the frequency hopping direction of the i th symbol group with respect to the i-1th symbol group, it can be determined.
  • the pseudo-random sequence c(n) is a 31-long Gold sequence.
  • x 1 (n+31) (x 1 (n+3)+x 1 (n)) mod2
  • x 2 (n+31) (x 2 (n+3)+x 2 (n+2)+x 2 (n+1)+x 2 (n)) mod2
  • the random access preamble can be sent repeatedly at the time.
  • the number of repetitions of the random access preamble is determined by the random access configuration parameters. Assume that the number of repetitions of the random access preamble is W, and W is a positive integer.
  • the random access preambles that are repeatedly transmitted are sequentially recorded as repeat 0, repeat 1, ... repeat W-1.
  • the foregoing multiple index expressions are used to calculate the frequency of the kth subcarrier of the ith symbol group of the random access preamble whose transmission repetition number is configured to 0.
  • the above multiple index expressions are also applicable to calculating the frequency of the kth subcarrier of the i th symbol group of the random access preamble whose transmission repetition number is greater than 1.
  • the number of repetitions is configured to be 3.
  • the present application further provides a method for transmitting a random access preamble applied on a network device side, Specifically include:
  • the network device sends random access configuration information to the terminal device, where the random access configuration information is used to indicate a format of the random access preamble;
  • the network device receives a random access preamble sent by the terminal device
  • the random access preamble is sent by the terminal device according to the determined frequency point information, and the random access preamble is composed of 4 symbol groups, and there is frequency hopping between each adjacent two symbol groups, and each symbol group
  • the frequency point information includes frequency points corresponding to the L symbol groups respectively; the frequency point information is determined according to the random access configuration information and a preset rule.
  • the two subcarrier frequency points are adjacent frequency points, or at least two of the two or more subcarrier frequency points are adjacent frequency points.
  • the relative positions of the two or more subcarrier frequency points distributed in the frequency domain direction are the same and remain unchanged during the frequency hopping process.
  • the hopping interval between each adjacent two symbol groups is an integer multiple of the subcarrier bandwidth, and the subcarrier bandwidth is 1.25 kHz.
  • the present application provides a random access preamble transmission method, which can select random access according to the conditions of the terminal device when both the single-carrier frequency hopping scheme and the multi-carrier frequency hopping scheme are supported.
  • the preamble is transmitted according to a single carrier or a multi-carrier method, that is, the terminal device itself selects whether to transmit each of the symbol groups of the new format random access preamble through one subcarrier frequency, or through two or two
  • the above subcarrier frequency points transmit each of the symbol groups of the new format random access preamble.
  • the present application Based on the new format of the random access preamble and the single carrier scheme or the multi-carrier scheme for transmitting the random access preamble, the present application provides a method for transmitting a random access preamble, which is applied to the terminal device side, such as As shown in Figure 17, the specific includes:
  • Step S201 The terminal device acquires random access configuration information that is sent by the network device, where the random access configuration information is used to indicate a format of the random access preamble.
  • the format of the multi-carrier frequency hopping scheme and the random access configuration parameter corresponding to the format may be notified in the system message.
  • the format of the single carrier frequency hopping scheme is also notified, and the random access configuration parameters corresponding to the format are also reported.
  • the random access configuration parameters of the two formats may include a random access preamble format index or a CP length, a random access resource period, a starting subcarrier frequency domain location, and a number of subcarriers allocated for random access.
  • RSRP Reference Signal Received Power
  • Step S202 the terminal device determines, according to the random access configuration information and the measured value of the received power of the reference signal, a sending manner of the random access preamble;
  • the sending manner is to send each of the symbol groups by one subcarrier frequency point, or send each of the symbol groups by two or more subcarrier frequency points;
  • the terminal device determines the coverage level according to the measured RSRP and the RSRP threshold obtained from the random access configuration parameter, for example, the user with good coverage condition selects the multi-carrier hopping.
  • the random access preamble adopts the format of the multi-carrier frequency hopping scheme.
  • the user with poor coverage condition selects the resource corresponding to the single carrier frequency hopping scheme, and the random access preamble adopts the format of the single carrier frequency hopping scheme.
  • Step S203 Send a random access preamble to the network device according to the sending manner and the format.
  • the terminal device determines, according to the measured value of the reference signal power and the reference signal received power threshold included in the random access configuration information, the coverage level of the terminal device; The coverage level determines the manner in which the random access preamble is transmitted.
  • the step S203 includes: acquiring, according to the sending manner, a preset rule and random access configuration information corresponding to the sending manner; and determining, according to the preset rule and the random access configuration information, The frequency point information of the random access preamble sent by the network device; the terminal device sends a random access preamble to the network device according to the frequency point information according to the format.
  • the terminal device After determining the transmission mode of the random access preamble, the terminal device determines, according to the preset rule and the random access configuration information, specific content of the frequency point information of the random access preamble sent to the network device, where the foregoing embodiment is used.
  • the single carrier scheme or the multi-carrier scheme is not described here.
  • the present application further provides a method for transmitting a random access preamble to be applied to a network device, which specifically includes:
  • the network device sends random access configuration information to the terminal device, where the random access configuration information is used to indicate a format of the random access preamble;
  • the network device receives a random access preamble sent by the terminal device
  • the random access preamble is sent by the terminal device according to the random access configuration information and the measured value of the reference signal received power, and the random access preamble includes L symbol groups, where L is a positive integer greater than or equal to 4. There is frequency hopping between each adjacent two symbol groups.
  • the random access configuration information includes a format of a multi-carrier frequency hopping scheme, and a random access configuration parameter corresponding to a format of the multi-carrier frequency hopping scheme, and includes a format of a single carrier frequency hopping scheme, and a single carrier frequency hopping scheme.
  • the random access configuration parameters of the two formats may include a random access preamble format index or a CP length, a random access resource period, a starting subcarrier frequency domain location, and a number of subcarriers allocated for random access. The number of repetitions of random access, the start time of random access, the maximum number of retransmissions of random access preamble, and the RSRP threshold.
  • the random access preamble is sent by the terminal device according to the measurement manner of the random access configuration information and the received power of the reference signal to determine the transmission mode of the random access preamble, and is sent according to the format and the sending manner;
  • Each symbol group is transmitted at a carrier frequency or each symbol group is transmitted through two or more subcarrier frequencies.
  • the sending mode is determined by the terminal device according to the measured value of the reference signal power and the reference signal receiving power threshold included in the random access configuration information, after determining the coverage level of the terminal device, according to the coverage level.
  • the random access preamble is that the terminal device acquires a preset rule and random access configuration information corresponding to the sending mode according to the sending mode, and determines a random connection sent to the network device according to the preset rule and the random access configuration information. After the frequency information of the preamble is entered, the frequency point information is sent to the network device according to the format.
  • the embodiment of the present application further provides a network device and a terminal device, and a random access preamble sending method applied in the network device and the terminal device, to adapt to the maximum cell radius of the NB-IoT is 100 km.
  • Application scenario. The related method steps performed by the network device and the terminal device and the implementation in the foregoing method embodiments may be referred to each other, and the repeated description will not be repeated.
  • a terminal device provided by an embodiment of the present application, as shown in FIG. 18, includes a processor 1001 and a transceiver 1004, where:
  • the transceiver 1004 is configured to support communication between the terminal device and the network device, and send the random connection to the network device. Information or instructions involved in the preamble transmission method.
  • the processor 1001 is configured to support the terminal device to perform a corresponding function in the random access preamble transmission method described above.
  • a memory 1002 and a communication interface 1003 are further included; wherein the processor 1001, the memory 1002, the communication interface 1003, and the transceiver 1004 are connected to each other through a bus 1005.
  • the memory is for coupling with a processor that stores program instructions and data necessary for the terminal device.
  • the processor 1001 may be a central processing unit (CPU), a network processor (NP), or a combination of a CPU and an NP.
  • the processor may further include a hardware chip.
  • the hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof.
  • the PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general array logic (GAL), or any combination thereof.
  • the memory 1002 includes a volatile memory such as a random-access memory (RAM); the memory may also include a non-volatile memory such as a flash memory.
  • RAM random-access memory
  • the memory may also include a non-volatile memory such as a flash memory.
  • a hard disk drive (HDD) or a solid-state drive (SSD); the memory may also include a combination of the above types of memories.
  • the communication interface 1003 can be a wired communication access port, a wireless communication interface, or a combination thereof, wherein the wired communication interface can be, for example, an Ethernet interface.
  • the Ethernet interface can be an optical interface, an electrical interface, or a combination thereof.
  • the wireless communication interface can be a WLAN interface.
  • the transceiver 1004 can be a wired transceiver, a wireless transceiver, or a combination thereof.
  • the wired transceiver can be, for example, an Ethernet interface.
  • the Ethernet interface can be an optical interface, an electrical interface, or a combination thereof.
  • the wireless transceiver can be, for example, a wireless local area network communication interface, a cellular network communication interface, or a combination thereof.
  • the bus 1005 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus.
  • PCI peripheral component interconnect
  • EISA extended industry standard architecture
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in the figure, but it does not mean that there is only one bus or one type of bus.
  • Bus 1005 can include any number of interconnected buses and bridges, specifically linked by various circuits of one or more processors 1001 represented by the processor and memory represented by memory 1002.
  • the bus can also link various other circuits such as peripherals, voltage regulators, and power management circuits, and will not be further described in this application.
  • Transceiver 1004 provides means for communicating with various other devices on a transmission medium.
  • the processor 1001 is responsible for managing the bus architecture and general processing, and the memory 1002 can store data used by the processor 1001 in performing operations.
  • the processor 1001 is configured to: acquire random access configuration information sent by the network device, where the random access configuration information is used to indicate a format of the random access preamble; according to the random access The configuration information and the preset rule determine the frequency point information of the random access preamble sent to the network device; according to the frequency point information, send the random access preamble to the network device by using the transceiver 1004 according to the format code;
  • the random access preamble is composed of L symbol groups, L is a positive integer greater than 4, and there is frequency hopping between each adjacent two of the symbol groups, and each of the symbol groups passes a subcarrier frequency.
  • the L symbol groups are composed of N groups, each group includes 4 symbol groups, where N is a positive integer greater than or equal to 2; one of the N groups At least one frequency hopping interval between the symbol groups, At least one hopping interval between symbol groups of another of the N groups is different.
  • the L symbol groups are composed of N groups, and one of the N groups includes m symbol groups, and m is a positive integer less than 4, in the N groups. All other groups include 4 symbol groups.
  • the preset rule for determining the frequency point information includes multiple index expressions, where the index expression is a current symbol group, based on the foregoing two group division manners of the L symbol groups.
  • An index expression of a frequency point position the index expression is used to indicate a frequency hopping interval and a frequency hopping direction of the current symbol group with respect to a previous symbol group, and a frequency point position of the previous symbol group The index relationship between the symbol group index numbers of the current symbol group.
  • the frequency point information is determined by:
  • the preset rule for determining the frequency point information includes multiple index expressions, where the index expression is a current group, based on the foregoing two group division manners of the L symbol groups.
  • An index expression of a frequency point position of the current symbol group; the index expression is used to indicate a frequency hopping interval and a frequency hopping direction of the current symbol group with respect to a previous symbol group, and the previous symbol group The index position between the frequency point location and the symbol group index number of the current symbol group.
  • the frequency point information is determined by:
  • Determining the current group according to a frequency point position of the first symbol group of the current group and a frequency hopping interval and a frequency hopping direction of each symbol group of the current group with respect to a previous symbol group. The frequency position of each symbol group.
  • the initialization seed of the pseudo random sequence is a function of a physical layer cell identifier or a physical layer cell identifier of the terminal device.
  • the hopping interval between the symbol groups is at least two, and Any of the hopping intervals is an integer multiple of the subcarrier bandwidth.
  • the frequency hopping interval between the groups of the N groups is an integer multiple of a subcarrier bandwidth.
  • the subcarrier bandwidth is 1.25 KHz.
  • any group of the N groups including 4 symbol groups including 4 symbol groups:
  • the frequency hopping direction of the second symbol group in the group relative to the first symbol group is opposite to the frequency hopping direction of the fourth symbol group in the group with respect to the third symbol group;
  • the frequency spacing is equal; and the frequency hopping interval is smaller than a hopping interval of the third symbol group relative to the second symbol group.
  • the processor 1001 is configured to: acquire random access configuration information sent by the network device, where the random access configuration information is used to indicate a format of the random access preamble; according to the random access The configuration information and the preset rule determine the frequency point information of the random access preamble sent to the network device; according to the frequency point information, send the random access preamble to the network device by using the transceiver 1004 according to the format code;
  • the random access preamble is composed of 4 symbol groups, and there is frequency hopping between each adjacent two symbol groups, and each of the symbol groups is sent by two or more subcarrier frequency points.
  • the frequency point information includes frequency points corresponding to the L symbol groups respectively.
  • the two subcarrier frequency points are adjacent frequency points, or at least two of the two or more subcarrier frequency points are adjacent frequency points.
  • the relative positions of the two or more subcarrier frequency points distributed in the frequency domain direction are the same and remain unchanged during the frequency hopping process.
  • the hopping interval between each two adjacent symbol groups is an integer multiple of a subcarrier bandwidth, and the subcarrier bandwidth is 1.25 kHz.
  • the processor 1001 is configured to: acquire random access configuration information sent by the network device, where the random access configuration information is used to indicate a format of the random access preamble;
  • the random access configuration information and the measured value of the received power of the reference signal are sent to the network device by using the transceiver 1004 according to the format, where the random access preamble includes L symbol groups, where L is A positive integer greater than or equal to 4, there is a frequency hopping between each adjacent two of the symbol groups.
  • the processor 1001 is configured to: determine, according to the random access configuration information and the measured value of the received power of the reference signal, a sending manner of the random access preamble; the sending manner is to send by using a subcarrier frequency Each of the symbol groups, or each of the symbol groups is transmitted by two or more subcarrier frequency points; according to the transmission mode and the format, a random connection is sent to the network device through the transceiver 1004. Enter the preamble.
  • the processor 1001 is configured to: determine a coverage level of the terminal device according to a measured value of the reference signal power and a reference signal received power threshold included in the random access configuration information; and determine the random according to the coverage level How to access the preamble.
  • the processor 1001 is configured to: acquire, according to the sending manner, a preset rule and random access configuration information corresponding to the sending manner; and determine, according to the preset rule and the random access configuration information, The frequency point information of the random access preamble sent by the network device is sent; according to the frequency point information, the random access preamble is sent to the network device by using the transceiver 1004 according to the format.
  • the terminal device includes a plurality of functional modules for performing the method steps related to the terminal device in the foregoing embodiment of the present application to adapt to the maximum cell radius of the NB-IoT being 100 km. Application scenario.
  • the terminal device 2000 includes a receiving module 2001, a transmitting module 2002, and a processing module 2003. It should be noted that the operations performed by the receiving module 2001, the sending module 2002, and the processing module 2003 can be regarded as the operations of the terminal device 2000.
  • the processing module 2003 in the terminal device 2000 can be used by the terminal device 2000.
  • the processor implementation, the receiving module 2001, and the sending module 2002 can be implemented by a transceiver in the terminal device 2000.
  • the processing module 2003 is configured to obtain random access configuration information that is sent by the network device, where the random access configuration information is used to indicate a format of the random access preamble, and determine according to the random access configuration information and a preset rule. Frequency point information of a random access preamble transmitted to the network device;
  • the sending module 2002 is configured to send a random access preamble to the network device according to the frequency point information determined by the processing module 2003 and the format;
  • the random access preamble is composed of L symbol groups, L is a positive integer greater than 4, and there is frequency hopping between each adjacent two of the symbol groups, and each of the symbol groups passes a subcarrier frequency.
  • the L symbol groups are composed of N groups, each group includes 4 symbol groups, where N is a positive integer greater than or equal to 2; one of the N groups At least one hopping interval between the symbol groups is different from at least one hopping interval between the symbol groups of the other of the N groups.
  • the L symbol groups are composed of N groups, and one of the N groups includes m symbol groups, and m is a positive integer less than 4, in the N groups. All other groups include 4 symbol groups.
  • the preset rule includes a plurality of index expressions, where the index expression is an index expression of a frequency point position of the current symbol group, and the index expression is used to indicate that the current symbol group is relative to the front An index relationship between a frequency hopping interval and a frequency hopping direction of a symbol group, a frequency point position of the previous symbol group, and a symbol group index number of the current symbol group.
  • processing module 2003 determines the frequency point information by:
  • the preset rule includes multiple index expressions, where the index expression is an index expression of a frequency point position of a current symbol group in a current group; the index expression is used to indicate the current The index relationship between the frequency hopping interval and the frequency hopping direction of the symbol group relative to the previous symbol group, the frequency point position of the previous symbol group, and the symbol group index number of the current symbol group.
  • processing module 2003 determines the frequency point information by:
  • Determining the current group according to a frequency point position of the first symbol group of the current group and a frequency hopping interval and a frequency hopping direction of each symbol group of the current group with respect to a previous symbol group. The frequency position of each symbol group.
  • the hopping interval between the symbol groups is at least two, and any one of the hopping intervals is an integer multiple of the subcarrier bandwidth.
  • the hopping interval between the groups of the N groups is an integer multiple of the subcarrier bandwidth.
  • the present application provides a network device 3000.
  • the network device 3000 includes a processor 3001 and a transceiver 3004, where:
  • the transceiver 3004 is configured to support communication between the terminal device and the network device, and send the information or the instruction involved in the foregoing random access preamble sending method to the terminal device.
  • the processor 3001 is configured to support the network device to perform a corresponding function in the random access preamble transmission method described above.
  • a memory 3002 and a communication interface 3003 are further included; wherein the processor 3001, the memory 3002, the communication interface 3003, and the transceiver 3004 are connected to each other through a bus 3005.
  • the memory is for coupling with a processor that holds program instructions and data necessary for the network device.
  • the processor 3001 may be a central processing unit (CPU), a network processor (NP), or a combination of a CPU and an NP.
  • the processor may further include a hardware chip.
  • the hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof.
  • the PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general array logic (GAL), or any combination thereof.
  • the memory 3002 includes a volatile memory such as a random-access memory (RAM); the memory may also include a non-volatile memory such as a flash memory.
  • RAM random-access memory
  • the memory may also include a non-volatile memory such as a flash memory.
  • a hard disk drive (HDD) or a solid-state drive (SSD); the memory may also include a combination of the above types of memories.
  • the communication interface 3003 can be a wired communication access port, a wireless communication interface, or a combination thereof, wherein the wired communication interface can be, for example, an Ethernet interface.
  • the Ethernet interface can be an optical interface, an electrical interface, or a combination thereof.
  • the wireless communication interface can be a WLAN interface.
  • the transceiver 3004 can be a wired transceiver, a wireless transceiver, or a combination thereof.
  • the wired transceiver can be, for example, an Ethernet interface.
  • the Ethernet interface can be an optical interface, an electrical interface, or a combination thereof.
  • the wireless transceiver can be, for example, a wireless local area network communication interface, a cellular network communication interface, or a combination thereof.
  • the bus 3005 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus.
  • PCI peripheral component interconnect
  • EISA extended industry standard architecture
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in the figure, but it does not mean that there is only one bus or one type of bus.
  • Bus 3005 can include any number of interconnected buses and bridges, specifically linked by various circuits of memory represented by one or more processors 3001 and memory 3002 represented by the processor.
  • the bus can also link various other circuits such as peripherals, voltage regulators, and power management circuits, and will not be further described in this application.
  • Transceiver 3004 provides means for communicating with various other devices on a transmission medium.
  • the processor 3001 is responsible for managing the bus architecture and general processing, and the memory 3002 can store data used by the processor 3001 in performing operations.
  • the transceiver 3004 is configured to send random access configuration information to the terminal device, where the random access configuration information is used to indicate a format of the random access preamble, and receive a random access preamble sent by the terminal device, where The random access preamble is sent by the terminal device according to the determined frequency point information according to the format, where the random access preamble is composed of L symbol groups, and L is a positive integer greater than 4, and each adjacent two There is a frequency hopping between the symbol groups, and each of the symbol groups is sent by a sub-carrier frequency, where the frequency point information includes frequency points corresponding to the L symbol groups respectively, and the frequency point information is according to the The random access configuration information and the preset rule are determined.
  • the L symbol groups are composed of N groups, each group includes 4 symbol groups, where N is a positive integer greater than or equal to 2; one of the N groups At least one hopping interval between the symbol groups is different from at least one hopping interval between the symbol groups of the other of the N groups.
  • the L symbol groups are composed of N groups, and one of the N groups includes m symbol groups, and m is a positive integer less than 4, in the N groups. All other groups include 4 symbol groups.
  • the preset rule used to determine the frequency point information includes multiple index expressions, where the index expression is a current symbol group, based on the foregoing two group division manners of the L symbol groups.
  • An index expression of a frequency point position the index expression is used to indicate a frequency hopping interval and a frequency hopping direction of the current symbol group with respect to a previous symbol group, and a frequency point position of the previous symbol group The index relationship between the symbol group index numbers of the current symbol group.
  • the frequency point information is determined by:
  • the preset rule used to determine the frequency point information includes multiple index expressions, where the index expression is a current group, based on the foregoing two group division manners of the L symbol groups.
  • An index expression of a frequency point position of the current symbol group; the index expression is used to indicate a frequency hopping interval and a frequency hopping direction of the current symbol group with respect to a previous symbol group, and the previous symbol group The index position between the frequency point location and the symbol group index number of the current symbol group.
  • the frequency point information is determined by:
  • Determining the current group according to a frequency point position of the first symbol group of the current group and a frequency hopping interval and a frequency hopping direction of each symbol group of the current group with respect to a previous symbol group. The frequency position of each symbol group.
  • the initialization seed of the pseudo random sequence is a function of a physical layer cell identifier or a physical layer cell identifier of the terminal device.
  • the hopping interval between the symbol groups is at least two, and Any of the hopping intervals is an integer multiple of the subcarrier bandwidth.
  • the frequency hopping interval between the groups of the N groups is an integer multiple of a subcarrier bandwidth.
  • the subcarrier bandwidth is 1.25 KHz.
  • any group of the N groups including 4 symbol groups including 4 symbol groups:
  • the frequency hopping direction of the second symbol group in the group relative to the first symbol group is opposite to the frequency hopping direction of the fourth symbol group in the group with respect to the third symbol group;
  • the frequency spacing is equal; and the frequency hopping interval is smaller than a hopping interval of the third symbol group relative to the second symbol group.
  • the transceiver 3004 is configured to send random access configuration information to the terminal device, where the random access configuration information is used to indicate a format of the random access preamble, and receive a random access preamble sent by the terminal device, where The random access preamble is sent by the terminal device according to the determined frequency point information according to the format, and the random access preamble is composed of four symbol groups, and frequency hopping exists between each adjacent two symbol groups.
  • Each of the symbol groups is transmitted by two or more subcarrier frequency points, where the frequency point information includes frequency points respectively corresponding to the L symbol groups; the frequency point information is according to the random access Configuration information and preset rules are determined.
  • the two subcarrier frequency points are adjacent frequency points, or at least two of the two or more subcarrier frequency points are adjacent frequency points.
  • the relative positions of the two or more subcarrier frequency points distributed in the frequency domain direction are the same and remain unchanged during the frequency hopping process.
  • the hopping interval between each two adjacent symbol groups is an integer multiple of a subcarrier bandwidth, and the subcarrier bandwidth is 1.25 kHz.
  • the transceiver 3004 is configured to send random access configuration information to the terminal device, where the random access configuration information is used to indicate a format of the random access preamble, and receive a random access preamble sent by the terminal device, where The random access preamble is sent by the terminal device according to the measured value of the random access configuration information and the reference signal received power, and the random access preamble includes L symbol groups, where L is greater than or A positive integer equal to 4, there is a frequency hopping between each adjacent two of the symbol groups.
  • the random access configuration information includes a format of a multi-carrier frequency hopping scheme, and a random access configuration parameter corresponding to a format of the multi-carrier frequency hopping scheme, and includes a format of a single carrier frequency hopping scheme, and single carrier frequency hopping.
  • the format of the scheme corresponds to the random access configuration parameter.
  • the random access configuration parameters of the two formats may include a random access preamble format index or a CP length, a random access resource period, a starting subcarrier frequency domain location, and a number of subcarriers allocated for random access. The number of repetitions of random access, the start time of random access, the maximum number of retransmissions of random access preamble, and the RSRP threshold.
  • the random access preamble is that after the terminal device determines the sending manner of the random access preamble according to the random access configuration information and the measured value of the received power of the reference signal, according to the format and the sending the way
  • the sending manner is that each of the symbol groups is transmitted through one subcarrier frequency point, or each of the symbol groups is transmitted through two or more subcarrier frequency points.
  • the sending manner is that the terminal device determines the coverage level of the terminal device according to the measured value of the reference signal power and the reference signal received power threshold included in the random access configuration information, according to the coverage The level is determined.
  • the random access preamble is that the terminal device acquires a preset rule and random access configuration information corresponding to the sending mode according to the sending manner; and according to the preset rule and the random connection After the configuration information is determined, the frequency point information of the random access preamble sent to the network device is determined, and then sent to the network device according to the format according to the frequency point information.
  • the network device includes multiple function modules for performing network device-related method steps in various embodiments involved in the present application to accommodate a maximum cell radius of NB-IoT of 100 km. Application scenario.
  • the network device 4000 shown in FIG. 21 includes a receiving module 4001, a transmitting module 4002, and a processing module 4003.
  • the operations performed by the receiving module 4001, the transmitting module 4002, and the processing module 4003 can all be considered as operations of the network device 4000.
  • the processing module 4003 in the network device 4000 can be implemented by a processor of the network device 4000, and the receiving module 4001 and the transmitting module 4002 can be implemented by a transceiver in the network device 4000.
  • the sending module 4002 is configured to send random access configuration information to the terminal device, where the random access configuration information is used to indicate a format of the random access preamble;
  • the receiving module 4001 is configured to receive a random access preamble sent by the terminal device, where the random access preamble is sent by the terminal device according to the determined frequency point information according to the format, the random access preamble
  • the code is composed of L symbol groups, L is a positive integer greater than 4, and there is frequency hopping between each adjacent two of the symbol groups, and each of the symbol groups is transmitted through a subcarrier frequency point, the frequency point information
  • the frequency points corresponding to the L symbol groups are respectively included, and the frequency point information is determined according to the random access configuration information and a preset rule.
  • the L symbol groups are composed of N groups, each group includes 4 symbol groups, where N is a positive integer greater than or equal to 2; one of the N groups At least one hopping interval between the symbol groups is different from at least one hopping interval between the symbol groups of the other of the N groups.
  • the L symbol groups are composed of N groups, and one of the N groups includes m symbol groups, and m is a positive integer less than 4, in the N groups. All other groups include 4 symbol groups.
  • the preset rule includes a plurality of index expressions, where the index expression is an index expression of a frequency point position of the current symbol group, and the index expression is used to indicate that the current symbol group is relative to the front An index relationship between a frequency hopping interval and a frequency hopping direction of a symbol group, a frequency point position of the previous symbol group, and a symbol group index number of the current symbol group.
  • processing module 4003 determines the frequency point information by:
  • the frequency point positions of the L symbol groups are determined.
  • the preset rule includes multiple index expressions, where the index expression is an index expression of a frequency point position of a current symbol group in a current group; the index expression is used to indicate the current The index relationship between the frequency hopping interval and the frequency hopping direction of the symbol group relative to the previous symbol group, the frequency point position of the previous symbol group, and the symbol group index number of the current symbol group.
  • processing module 4003 determines the frequency point information by:
  • Determining the current group according to a frequency point position of the first symbol group of the current group and a frequency hopping interval and a frequency hopping direction of each symbol group of the current group with respect to a previous symbol group. The frequency position of each symbol group.
  • the hopping interval between the symbol groups is at least two, and any one of the hopping intervals is an integer multiple of the subcarrier bandwidth.
  • the hopping interval between the groups of the N groups is an integer multiple of the subcarrier bandwidth.
  • the present application provides a computer readable storage medium having instructions stored therein that, when run on a computer, cause the computer to execute the various embodiments and terminals involved in the present application Device related method steps.
  • the present application provides a computer readable storage medium having instructions stored therein that, when run on a computer, cause the computer to perform various embodiments and networks involved in the present application Device related method steps.
  • the present application provides a computer program product comprising instructions that, when executed on a computer, cause the computer to perform the method steps associated with the terminal device in various embodiments of the present application.
  • the present application provides a computer program product comprising instructions that, when run on a computer, cause the computer to perform the method steps associated with the network device in various embodiments of the present application.
  • the steps of the method or algorithm described in the embodiments of the present application may directly embed the software executed by the hardware and the processing unit. Module, or a combination of the two.
  • the software modules can be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium in the art.
  • the storage medium can be coupled to the processing unit such that the processing unit can read information from the storage medium and can write information to the storage medium.
  • the storage medium can also be integrated into the processing unit.
  • the processing unit and the storage medium may be configured in an ASIC, and the ASIC may be configured in the user terminal. Alternatively, the processing unit and the storage medium may also be configured in different components in the user terminal.
  • the above-described functions described in the embodiments of the present invention may be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, these functions may be stored on a computer readable medium or transmitted as one or more instructions or code to a computer readable medium.
  • Computer readable media includes computer storage media and communication media that facilitates the transfer of computer programs from one place to another.
  • the storage medium can be any available media that any general purpose or special computer can access.
  • Such computer-readable media can include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage device, or any other device or data structure that can be used for carrying or storing Other media that can be read by a general purpose or special computer, or a general or special processing unit.
  • any connection can be appropriately defined as a computer readable medium, for example, if the software is from a website site, server or other remote source through a coaxial cable, fiber optic computer, twisted pair, digital subscriber line (DSL) Or wirelessly transmitted in, for example, infrared, wireless, and microwave, is also included in the defined computer readable medium.
  • DSL digital subscriber line
  • the disks and discs include compact disks, laser disks, optical disks, DVDs, floppy disks, and Blu-ray disks. Disks typically replicate data magnetically, while disks typically optically replicate data with a laser. Combinations of the above may also be included in a computer readable medium.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un dispositif d'envoi d'un préambule d'accès aléatoire. Le procédé comprend les étapes suivantes : un dispositif terminal acquiert des informations de configuration d'accès aléatoire envoyées par un dispositif de réseau, les informations de configuration d'accès aléatoire étant utilisées pour indiquer un format d'un préambule d'accès aléatoire; le dispositif terminal détermine, en fonction des informations de configuration d'accès aléatoire et d'une règle prédéfinie, des informations de point de fréquence envoyées au dispositif de réseau et concernant le préambule d'accès aléatoire; et le dispositif terminal envoie, en fonction des informations de point de fréquence, le préambule d'accès aléatoire au dispositif de réseau sur la base du format, le préambule d'accès aléatoire étant composé de L groupes de symboles, L étant un nombre entier positif supérieur à 4, un saut de fréquence existant entre chaque paire de groupes de symboles adjacents, chaque groupe de symboles étant envoyé au moyen d'un point de fréquence de sous-porteuse, et les informations de point de fréquence comprenant des points de fréquence qui correspondent respectivement aux L groupes de symboles. Le procédé d'envoi à porteuse unique pour des groupes de symboles d'un préambule d'accès aléatoire et les informations de point de fréquence déterminées en fonction d'un nouveau format permettent à un dispositif terminal de s'adapter au scénario d'application d'un système NB-IoT prenant en charge une bande passante de sous-porteuse plus étroite et couvrant un rayon de cellule plus grand.
PCT/CN2017/082578 2017-04-28 2017-04-28 Procédé et dispositif d'envoi de préambule d'accès aléatoire Ceased WO2018195984A1 (fr)

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CN201780088127.5A CN110419260B (zh) 2017-04-28 2017-04-28 一种随机接入前导码发送方法及设备

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