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WO2017028273A1 - 支持多种传输时间间隔的随机接入方法、装置以及通信系统 - Google Patents

支持多种传输时间间隔的随机接入方法、装置以及通信系统 Download PDF

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Publication number
WO2017028273A1
WO2017028273A1 PCT/CN2015/087502 CN2015087502W WO2017028273A1 WO 2017028273 A1 WO2017028273 A1 WO 2017028273A1 CN 2015087502 W CN2015087502 W CN 2015087502W WO 2017028273 A1 WO2017028273 A1 WO 2017028273A1
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WIPO (PCT)
Prior art keywords
user equipment
random access
preamble sequence
rnti
message
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PCT/CN2015/087502
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English (en)
French (fr)
Inventor
史玉龙
徐海博
周华
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Fujitsu Ltd
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Fujitsu Ltd
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Priority to PCT/CN2015/087502 priority Critical patent/WO2017028273A1/zh
Priority to EP15901477.8A priority patent/EP3340504B1/en
Priority to CN201580082028.7A priority patent/CN107852266B/zh
Priority to JP2018508217A priority patent/JP6525104B2/ja
Priority to KR1020187006151A priority patent/KR102054357B1/ko
Publication of WO2017028273A1 publication Critical patent/WO2017028273A1/zh
Priority to US15/892,779 priority patent/US10440754B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a random access method, apparatus, and communication system supporting multiple Transmission Time Intervals (TTIs) in a Long Term Evolution (LTE) system.
  • TTIs Transmission Time Intervals
  • LTE Long Term Evolution
  • Real-time services such as autonomous driving and industrial automation control that will appear in next-generation mobile communication networks have high requirements on transmission delay, such as requiring end-to-end delays between 1ms and 10ms.
  • end-to-end delays between 1ms and 10ms.
  • TCP Transmission Control Protocol
  • reducing the end-to-end delay can significantly improve the throughput of the system. From these two aspects, the LTE system urgently needs to reduce the end-to-end delay of user services.
  • the 3rd Generation Partnership Project (3GPP, 3rd Generation Partnership Project) is studying ways to reduce end-to-end delay by shortening TTI.
  • the legacy user equipment (UE, User Equipment) adopts a TTI of 1 ms, which is the same as the length of a subframe, that is, the basic time unit of scheduling data is 1 ms. If the shortened TTI is supported in the latest version of the UE, for example, the TTI is 0.5 ms or less, the end-to-end delay of the service is significantly reduced.
  • the round trip time (RTT, Round Trip Time) is 8 TTIs. After shortening the TTI, the RTT will change from the original 8ms to 4ms, or even shorter.
  • legacy UEs legacy UEs
  • UEs with short TTIs shorter TTI UEs.
  • the design of the LTE system needs to maintain backward compatibility, ensuring that legacy UEs and UEs with short TTIs can work simultaneously without affecting each other.
  • the inventor has found that if a plurality of user equipments of the TTI type perform random access according to an existing protocol, the base station cannot distinguish which TTI type user equipment is transmitted by the preamble sequence, and the user sets The ambiguity or error of RAR reception may also be caused by the inability to distinguish the received random access response (RAR).
  • Embodiments of the present invention provide a random access method, apparatus, and communication system that support multiple TTIs.
  • the message of the user equipment with short TTI in the random access procedure is allowed to be transmitted using short TTI.
  • a random access method for supporting multiple TTIs is provided, which is applied to a user equipment, where the random access method includes:
  • the user equipment sends a preamble sequence for requesting random access to the base station by using the first message, where the TTI type of the user equipment is indicated by the first message;
  • the user equipment receives a random access response sent by the base station by using a second message; where different TTI types correspond to different random access responses.
  • a random access device that supports multiple TTIs is provided, which is configured in a user equipment, where the random access device includes:
  • the random request sending unit sends a preamble sequence for requesting random access to the base station by using the first message, where the TTI type of the user equipment is indicated by the first message;
  • the random response receiving unit receives a random access response sent by the base station by using a second message, where different TTI types correspond to different random access responses.
  • a random access method for supporting multiple TTIs is provided, which is applied to a base station, where the random access method includes:
  • the base station sends a random access response to the user equipment by using a second message, where different TTI types correspond to different random access responses.
  • a random access device supporting multiple TTIs which is configured in a base station, where the random access device includes:
  • the random request receiving unit receives, by using the first message, a preamble sequence for requesting random access, which is sent by the user equipment, where the TTI type of the user equipment is indicated by the first message;
  • the random response sending unit sends a random access response to the user equipment by using a second message, where different TTI types correspond to different random access responses.
  • a communication system supporting a plurality of TTIs the communication The system includes:
  • the user equipment sends, by using the first message, a preamble sequence for requesting random access; wherein the first message indicates a TTI type of the user equipment; and receives a random access response sent by the second message;
  • the base station receives the preamble sequence sent by the user equipment by using the first message, and sends the random access response to the user equipment by using the second message, where different TTI types correspond to different Random access response.
  • a computer readable program wherein when the program is executed in a user equipment, the program causes a computer to perform a random access method as described above in the user equipment .
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a random access method as described above in a user equipment.
  • a computer readable program wherein when the program is executed in a base station, the program causes a computer to perform a random access method as described above in the base station.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a random access method as described above in a base station.
  • the benefit of the embodiment of the present invention is that the first message of the sending preamble sequence indicates the TTI type of the user equipment, and the base station can distinguish which TTI type user equipment is sent by the preamble sequence, and the user equipment can distinguish the received RAR, An ambiguity or error that would result in RAR reception.
  • the delay of the random access procedure of the user equipment with short TTI can be greatly reduced.
  • FIG. 1 is a schematic diagram of a random access method supporting multiple TTIs according to Embodiment 1 of the present invention
  • FIG. 2 is another schematic diagram of a random access method supporting multiple TTIs according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic diagram of a preamble sequence having a different length from a conventional format according to Embodiment 1 of the present invention
  • FIG. 4 is a schematic diagram of a preamble sequence of the same length as a conventional format according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic diagram of grouping 64 sequences occupied by UEs with short TTI according to Embodiment 1 of the present invention.
  • FIG. 6 is a schematic diagram of a random access method supporting multiple TTIs according to Embodiment 2 of the present invention.
  • FIG. 7 is a schematic diagram of a random access device supporting multiple TTIs according to Embodiment 3 of the present invention.
  • FIG. 8 is another schematic diagram of a random access device supporting multiple TTIs according to Embodiment 3 of the present invention.
  • FIG. 9 is a schematic diagram of a user equipment according to Embodiment 3 of the present invention.
  • FIG. 10 is a schematic diagram of a random access device supporting multiple TTIs according to Embodiment 4 of the present invention.
  • FIG. 11 is another schematic diagram of a random access device supporting multiple TTIs according to Embodiment 4 of the present invention.
  • FIG. 12 is a schematic diagram of a base station according to Embodiment 4 of the present invention.
  • Figure 13 is a diagram showing the communication system of Embodiment 5 of the present invention.
  • the LTE random access procedure (illustrated by the contention-based random access as an example) mainly includes four steps: the UE sends a preamble sequence through message 1, and initiates a random access procedure to a base station (for example, an eNB); the base station sends a RAR through message 2. , providing timing synchronization and uplink resource grant (UL Grant) for the UE; the UE sends a message through the message 3
  • the base station provides an ID (identification) for competing for resolution with other UEs; the base station notifies the UE that the access is successful through the message 4.
  • the RAR will start transmitting at the 3 TTIs after the message 1, and the message 3 will be sent at the 6 TTIs after the RAR is received. From the perspective of delay, if the UE with short TTI uses the shortened TTI for transmission in the above four messages in the random access procedure, the delay of the random access procedure is significantly reduced.
  • the downlink and uplink delays of the traditional random access procedure are 13.5 ms and 10.5 ms, respectively. If a 0.5 ms TTI transmission can be used during the random access procedure, the delay of the process can be reduced to about half of the original, that is, 6.5 ms and 5 ms. This is important for reducing the delay when performing uplink or downlink data transmission for a UE that loses synchronization. Therefore, it is required to support multiple TTI types of UEs to access the network at the same time in the random access process, and ensure mutual compatibility.
  • the random access procedure initiated at this time may come from a legacy UE, or may be from a UE with a short TTI (and there may be multiple UEs with short TTI, such as a TTI of 0.5 ms, 0.14 ms, etc.).
  • the random access channel resources used by the preamble sent by the UE in the message 1 and the available preamble sequences are uniformly configured by the base station for all UEs.
  • the base station detects a possible preamble sequence on the configured resource location, and makes different RARs according to the detected time-frequency resource location and sequence characteristics of the preamble.
  • these resources and sequences are defined for legacy UEs, and the base station cannot distinguish which TTI type UEs the detected preamble is.
  • the UE After the UE sends the message 1, it will receive the RAR that may arrive in a receiving window. However, if the random access time-frequency resource location and the preamble sequence selected by the legacy UE and the UE with the short TTI are exactly the same, the RAR scrambling sequence is the random access radio network temporary identifier (RA-RNTI) and its flag bit. The RAPID field is exactly the same. If a certain UE cannot distinguish whether the received RAR is sent to the legacy UE or the short TTI UE, it may cause ambiguity or error in RAR reception.
  • RA-RNTI random access radio network temporary identifier
  • the base station in order to transmit a RAR to a base station, it is possible to adopt a UE with a short TTI.
  • the corresponding short TTI mode transmission can notify the base station to initiate the random access UE type as early as possible. That is, the message carries the TTI type information of the UE, so that the base station can distinguish which type of UE the preamble is sent by.
  • the base station can send different types of RAR messages for different types of UEs, and ensure that the corresponding UE correctly receives the corresponding RAR.
  • the present invention is described below by taking contention-based random access as an example, but the present invention is not limited thereto, and may be applied to, for example, a non-contention random access procedure.
  • the embodiment of the invention provides a random access method supporting multiple TTIs, which is applied to user equipments.
  • FIG. 1 is a schematic diagram of a random access method supporting multiple TTIs according to an embodiment of the present invention, showing a situation on the user equipment side.
  • the random access method includes:
  • Step 101 The user equipment sends a preamble sequence for requesting random access to the base station by using the first message, where the TTI type of the user equipment is indicated by the first message;
  • Step 102 The user equipment receives an RAR that is sent by the base station by using a second message, where different TTI types correspond to different RARs.
  • FIG. 2 is another schematic diagram of a random access method supporting multiple TTIs according to an embodiment of the present invention, showing a situation in which a user equipment interacts with a base station when a contention based random access procedure is employed.
  • the random access method includes:
  • Step 201 The user equipment sends a preamble sequence for requesting random access to the base station by using the first message, where the TTI type of the user equipment is indicated by the first message.
  • Step 202 The base station sends an RAR to the user equipment by using the second message, where different TTI types correspond to different RARs.
  • the random access method may further include:
  • Step 203 The user equipment sends a user equipment identifier to the base station by using a third message for contention resolution.
  • Step 204 The base station sends the contention result information to the user equipment by using the fourth message.
  • the user equipment includes: a first user equipment that uses a first TTI type and a second user equipment that uses a second TTI type; wherein the first TTI type and the second TTI type correspond to The TTI is different and less than or equal to 1 millisecond.
  • the first user equipment may be one or more types of user equipments using the first TTI type
  • the second The user equipment may be one or more types of user equipment using a second TTI type.
  • the base station uniformly allocates resources for a certain type of user equipment.
  • the user equipment that is, the legacy UE whose TTI is 1 millisecond is used as the first user equipment
  • the user equipment that is, the UE with the short TTI whose TTI is less than 1 millisecond (for example, 0.5 ms) is taken as an example for description.
  • the user equipment When the user equipment initiates random access, it selects to send a preamble sequence as a first message (message 1) on an available resource, and the base station detects and receives the preamble sequence on the time-frequency resources of all preamble sequences.
  • the TTI type of the user equipment can be distinguished by the resources used by the preamble sequence; it can also be distinguished by the format or content of the preamble sequence.
  • multiple TTI types may be distinguished by resources occupied by the preamble sequence; the resources include one or any combination of the following: a time domain resource, a frequency domain resource, and a sequence resource. .
  • the UE selects available time domain resources configured by the base station, available frequency domain resources, and an optional ZC (Zadoff-Chu) sequence (64 in total) to transmit the preamble sequence. Therefore, three methods can be used to distinguish the preamble sequences of different TTI type UEs: allocating exclusive time domain resources for UEs with short TTIs; assigning exclusive frequency domain resources for UEs with short TTIs; and assigning exclusive to UEs with short TTIs ZC sequence. These three methods can be used in any one of them, or can be combined in combination at the same time.
  • the time domain resource that the first user equipment sends the preamble sequence is different from the time domain resources that the second user equipment sends the preamble sequence and is orthogonal to each other.
  • the first user equipment uses a first time domain resource table
  • the second user equipment uses a second time domain resource table; in the first time domain resource table and the second time domain resource table,
  • the same physical random access channel (PRACH) configuration index corresponds to a different subframe number.
  • PRACH physical random access channel
  • the legacy UE searches for the subframe number and the real-time domain resource available in Table 5.7.1-2 of the TS 36.211 protocol according to the parameter prach-ConfigIndex configured by the base station.
  • Table 1 Time domain resource tables used by legacy UEs (same as TS 36.211 Table 5.7.1-2)
  • a time domain resource ie, a subframe number
  • the time domain resources available to the corresponding legacy UE under the same prach-ConfigIndex are orthogonal to each other. That is, the base station configures the same prach-ConfigIndex for all UEs, but the set of available subframe numbers indicated by the legacy UE and the UE with the short TTI is completely different (ie, there is no intersection).
  • One of the implementation methods may be to define a new time domain resource table, as shown in Table 2, which corresponds to the parallel table in Table 5.7.1-2 of the TS 36.211 protocol.
  • a UE with a short TTI is only looked up in Table 2 when it selects to transmit the time domain resources of the preamble sequence.
  • the specific content of the table is not limited to Table 2 as long as it is orthogonal to the lookup table of the legacy UE.
  • implementations are not limited to methods of configuring separate time domain resource tables, and any other method such that UEs with short TTIs select time domain resources that are orthogonal to conventional UE selection are within the scope of the present invention.
  • Table 2 Time Domain Resource Table Used by Short TTI UEs (New Definition of the Invention)
  • Table 2 only schematically shows the case where the present invention uses the time domain resource to distinguish the preamble sequence, but the present invention is not limited thereto, and for example, the specific content of Table 2 can also be appropriately adjusted.
  • the frequency domain resource of the first user equipment that sends the preamble sequence is different from the frequency domain resources of the second user equipment that sends the preamble sequence and is orthogonal to each other.
  • the first user equipment sends a frequency domain resource of the preamble sequence by using a first parameter
  • the second user equipment uses a second parameter to select a frequency domain resource that sends the preamble sequence.
  • the legacy UE selects a frequency domain resource that transmits the preamble sequence according to the parameter prach-FreqOffset (first parameter) configured by the base station.
  • prach-FreqOffset first parameter
  • new frequency domain resources may be added to UEs with short TTIs, and the frequency domain resources used by legacy UEs are orthogonal to each other.
  • the base station adds a new parameter prach-FreqOffset-shorterTTI (second parameter) in the parameter PRACH-Config to indicate the frequency domain used by the UE with short TTI, and the parameter range is, for example, 0 to 94.
  • the traditional UE can ignore the parameter prach-FreqOffset-shorterTTI.
  • the ZC sequence in the preamble sequence sent by the first user equipment is different from the ZC sequence in the preamble sequence sent by the second user equipment;
  • a first portion of the 64 ZC sequences corresponds to the first user equipment, and a second portion of the 64 ZC sequences corresponds to the second user equipment.
  • the legacy UE selects one of the 64 ZC sequences as the preamble sequence according to the parameters configured by the base station.
  • the numberOfRA-Preambles sequence is used by the legacy UE except for the sequence used for non-contention random access, where sizeOfRA-PreamblesGroupA sequences belong to GroupA and the rest are GroupB.
  • the base station adds new parameters to characterize the ZC sequences that the UEs with short TTI can use. These sequences should belong to the parts other than the available sequences of the legacy UE. Minute.
  • a parameter numberOfRA-Preambles-TTItype1 is defined for the first UE with a short TTI, and sizeOfRA-PreamblesGroupA-TTItype1 is defined; a parameter numberOfRA-Preambles-TTItype2 is defined for the second UE with a short TTI, and sizeOfRA-PreamblesGroupA- is defined. TTItype2.
  • multiple sets of parameters can be defined for more types of UEs with short TTIs to specify the range of ZC sequences they use.
  • the ZC sequences used between legacy UEs and UEs of different TTI types do not coincide with each other.
  • the first numberOfRA-Preambles sequence of the 64 sequences is used by the legacy UE, and the numberOfRA-Preambles-TTItype 1 sequence is used by the first UE with a short TTI, followed by numberOfRA-Preambles-TTItype2
  • the sequence is used by the second UE with a short TTI.
  • the former part of the ZC sequence used by each TTI type UE is defined as belonging to Group A, and its size is defined by parameters sizeOfRA-PreamblesGroupA-TTItype1, sizeOfRA-PreamblesGroupA-TTItype2, and the like.
  • the latter half of the sequence used by this type of UE belongs to GroupB.
  • multiple TTI types may be distinguished by the format or content of the preamble sequence.
  • the legacy UE searches for the preamble sequence format to be used in Table 5.7.1-2 of the TS 36.211 protocol according to the prach-ConfigIndex configured by the base station, including format 0, format1, format2, format3, and the like. It can be distinguished from legacy UEs by designing a new preamble sequence format for UEs with short TTI.
  • the new format should have good cross-correlation with traditional preamble sequences, and can transmit both traditional and new formats with little interference.
  • the length of the preamble sequence of the new format and the traditional format is not necessarily the same.
  • the specific design of the new preamble sequence format is not in the scope of the present invention. The following only takes the features of the three new formats as an example, and the corresponding random access method is defined for different formats.
  • the length of the preamble sequence adopted by the first user equipment is different from the length of the preamble sequence used by the second user equipment.
  • the length of the preamble sequence used by the first user equipment is 1 millisecond, 2 milliseconds, or 3 milliseconds
  • the length of the preamble sequence used by the second user equipment is 0.5 milliseconds
  • the second user equipment is multiple.
  • the preamble sequence is transmitted by randomly selecting one time slot in the available time slots.
  • the traditional format format0, format1, format2, and format3 have good cross-correlation and little interference.
  • the length of the format 5 is 0.5 ms.
  • the length of the cyclic prefix (CP, Cyclic Prefix), guard interval (GT, Guard Time), and ZC sequence is not limited.
  • FIG. 3 is a schematic diagram of a preamble sequence having a different length from a conventional format according to an embodiment of the present invention. As shown in Figure 3, format 5 takes up 0.5 ms. It should be noted that FIG. 3 only schematically shows a new format different from the existing preamble sequence format, but the present invention is not limited thereto, and may be, for example, other length formats.
  • the preamble sequence is transmitted using format 5.
  • the UE with a short TTI selects a starting subframe.
  • a 0.5 ms time slot is randomly selected to send the preamble:
  • Case 1 If the base station is configured as format 0 (length is 1 ms, that is, 2 slots), the UE randomly selects one slot to transmit in 2 slots after the start subframe;
  • Case 2 If the base station is configured as format 1, 2 (length is 2 ms, that is, 4 time slots), the UE randomly selects one time slot to transmit in 4 time slots after the start subframe;
  • Case 3 If the base station is configured as format 3 (length is 3 ms, that is, 6 slots), the UE randomly selects one slot to transmit in 6 slots after the start subframe.
  • the resources used by the UE to transmit the preamble sequence are performed according to the configuration of the base station.
  • the UE records itself to select the first time slot transmission, which is denoted as s_id (0 ⁇ s_id ⁇ 6), that is, s_id indicates that the UE with the short TTI transmits the slot position of the preamble sequence in the optional time domain resource.
  • This value s_id will be used to calculate the RA-RNTI described later.
  • the length of the preamble sequence used by the first user equipment is the same as the length of the preamble sequence used by the second user equipment, but the format is different.
  • format 0a length 1ms, corresponding to format 0
  • format1a length 2ms, corresponding to format 1
  • format 2a length 2ms, corresponding to format 2
  • format3a length is 3ms, corresponding to format 3
  • the new format takes the same length of time as the corresponding traditional format, and the lengths of the CP, GT, and ZC sequences are not limited.
  • FIG. 4 is a schematic diagram of a preamble sequence of the same length as a conventional format according to an embodiment of the present invention.
  • format 0a, format 1a, format 2a, and format 3a occupy the same length of time as format 0, format 1, format 2, and format 3, respectively, but the contents (such as the lengths of CP, GT, and ZC) are different.
  • a new format corresponding to it is selected according to the preamble sequence format specified in the prach-ConfigIndex parameter of the base station configuration. That is, if the legacy UE selects format 0, the UE with the short TTI selects format 0a; if the legacy UE selects format 1, the UE with the short TTI selects format 1a; and the like.
  • the UE transmits the preamble sequence using resources according to the base station configuration.
  • the ZC sequence in the preamble sequence used by the first user equipment is different from the ZC sequence in the preamble sequence used by the second user equipment; wherein the first user setting corresponds to 64 first ZC sequences, and The second user equipment generates different 64 second ZC sequences.
  • the root sequence is used to first generate 64 sequences for the legacy UE. If less than 64, according to the TS 36.211 Table 5.7.2-4, The sequence of the root sequence uses the next root sequence to generate more ZC sequences until it reaches 64, and its index is 0-63.
  • RRC Radio Resource Control
  • 64 ZC sequences are further generated by other root sequences in the order of the root sequences. It is unique to a short TTI UE, and its preamble index is also 0-63, which is repeated with the legacy UE; that is, a sequence number of 0-63 corresponds to a conventional sequence (first ZC sequence) and a new sequence (second ZC sequence).
  • the 128 ZC sequences generated are known to both the base station and the UE. The cross-correlation between these 128 ZC sequences is very good.
  • a UE with a short TTI selects a corresponding preamble sequence according to the configuration of the base station, using the same format as the legacy UE, but the transmission sequence uses 64 sequences unique to UEs with short TTI.
  • the resources used to transmit the preamble sequence are configured according to the base station configuration.
  • the grouping of the ZC sequence may also be performed for the UE having the short TTI, and is applicable to all the embodiments except the embodiment 1.1.3 described above in the present invention.
  • UEs with short TTIs can occupy 64 ZC sequences. Grouping UEs with short TTI does not affect the traditional The grouping of the UEs is independent of each other.
  • Groups of GroupA and GroupB of respective types are divided into UEs of different TTI types (eg, 0.5 ms, 0.1 ms, etc.) by grouping.
  • the parameters numberOfRA-Preambles-TTItype1 and sizeOfRA-PreamblesGroupA-TTItype1 are defined for the UE of the short TTI type 1
  • the parameters numberOfRA-Preambles-TTItype2 and sizeOfRA-PreamblesGroupA-TTItype2 are defined for the UEs of the short TTI type 2, respectively, for each specific
  • the short TTI type defines parameters that are used to define the sequence range that the UE can use.
  • numberOfRA-Preambles-TTItypei indicates the number of ZC sequences that can be used by the i-th UE with a short TTI
  • sizeOfRA-PreamblesGroupA-TTItypei indicates the number of sequences belonging to its GroupA in the available sequence of the i-th UE with a short TTI, and the rest The sequence belongs to GroupB.
  • FIG. 5 is a schematic diagram of grouping 64 sequences occupied by UEs with short TTI according to an embodiment of the present invention.
  • the first type of UE having a short TTI may use a sequence number from 0 to numberOfRA-Preambles-TTItype 1-1, where the first sizeOfRA-PreamblesGroupA-TTItype1 sequence belongs to Group A, and the remaining sequences are It belongs to Group B;
  • the second type of short TTI UE can use a sequence sequence number from numberOfRA-Preambles-TTItype1 to numberOfRA-Preambles-TTItype1+numberOfRA-Preambles-TTItype2–1, where the preceding sizeOfRA-PreamblesGroupA-TTItype2 sequences belong to Group A, the rest is Group B; and so on.
  • the user equipment may also send a first message that does not indicate the TTI type if the first message indicating that the TTI type fails to be sent.
  • a UE with a short TTI when a UE with a short TTI sends a preamble sequence to notify the base station of its TTI type according to the above method, if multiple attempts fail, the UE with a short TTI should transmit the preamble sequence according to the transmission method of the legacy UE.
  • Information about the associated TTI type may be conveyed in subsequent signaling (e.g., carrying TTI type information in message 3) during which transmissions are made using conventional TTI.
  • Step 101 or 201 is schematically explained above, and step 102 or 202 will be described below.
  • the user equipment starts to listen to the physical downlink control channel (PDCCH, Physical Downlink Control Channel) scrambled by the RA-RNTI when the three TTIs after the preamble sequence is transmitted.
  • PDCCH Physical Downlink Control Channel
  • the UE After the UE transmits the preamble sequence, it will listen to the scrambling by the RA-RNTI in the "RAR time window". PDCCH to receive the RAR corresponding to its own RA-RNTI. If the RAR returned by the base station is not received within this RAR time window, the random access procedure fails.
  • the RAR time window begins with 3 subframes after the subframe in which the preamble sequence is transmitted.
  • the RAR time window starts at the 3 TTIs after the preamble sequence is transmitted (for example, for a 0.5 ms TTI, the RAR can be started after 1.5 ms), and the ra-ResponseWindowSize TTI length is continued.
  • the first user equipment and the second user equipment may each correspond to a first RA-RNTI (ie, a legacy RA-RNTI).
  • the first user equipment corresponds to a first RA-RNTI, and the first RA-RNTI is determined by sending a time domain resource and a frequency domain resource of the preamble sequence; The second RA-RNTI of the first RA-RNTI.
  • the RA-RNTI is used to distinguish the RAR corresponding to the UE that transmits the preamble by using different time-frequency resources.
  • the legacy UE uses the same preamble sequence resource as the UE with the short TTI, and may use the same ZC sequence or the same ZC sequence number (for the embodiment 1.2.3, the sequence index indicates at most 64
  • the RAR corresponding to the legacy UE and the UE with the short TTI can be distinguished by the RA-RNTI.
  • the embodiment of the present invention defines a new RA-RNTI calculation method for a UE with a short TTI.
  • the RA-RNTI corresponding to the UE having the short TTI may be related not only to the time domain resource and the frequency domain resource for transmitting the preamble sequence, but also to the slot position at which the preamble sequence is transmitted.
  • the value of the second RA-RNTI may be a positive integer multiple of 60 added to the value of the first RA-RNTI.
  • the above calculation method of the RA-RNTI is only schematically illustrated, but the present invention is not limited thereto.
  • the above calculation formula can be appropriately adjusted according to actual conditions. Can make new RA-RNTI and pass The range of RA-RNTI values is different, and there is no intersection at all.
  • the base station can know the TTI type of the UE transmitting the preamble sequence through the message 1, or the base station can learn the TTI type of the UE through other methods such as the core network, and the base station should send the corresponding RAR for different types of UEs.
  • the base station scrambles the PDCCH using the first RA-RNTI for the RAR of the first user equipment, and scrambles the PDCCH using the second RA-RNTI for the RAR of the second user equipment.
  • Each user equipment can descramble the PDCCH according to its own RA-RNTI.
  • the present invention is not limited thereto. It is also possible that the base station uses the first RA-RNTI to scramble each user equipment. For details, refer to Embodiment 2.
  • the base station may not know the TTI type of the UE transmitting the preamble sequence, in which case the base station may transmit a plurality of RARs corresponding to the plurality of TTI types for one of the received preamble sequences. For example, two RARs are transmitted for each detected preamble sequence (for legacy UEs and 0.5 ms TTI UEs, respectively).
  • the user equipment can obtain the RAR as follows.
  • the first user equipment uses the first RA-RNTI to descramble the PDCCH
  • the second user equipment uses the second RA-RNTI to descramble the PDCCH.
  • the physical downlink shared channel (PDSCH, Physical Downlink) may also be performed according to the PDCCH indication. Shared Channel) for decoding.
  • the base station sends two RARs for one received preamble sequence, and the UE can correctly receive the RAR corresponding to itself in two ways:
  • Manner 1 The traditional UE adopts the traditional RA-RNTI calculation method, and the UE with the short TTI adopts the newly defined RA-RNTI calculation method of the present invention.
  • the base station scrambles the RARs with different RA-RNTIs.
  • the UE descrambles the PDCCH with the RA-RNTI, the RAR of the legacy UE and the RAR of the short TTI UE can be distinguished.
  • Mode 2 The UE receives all RARs in the RAR time window and decrypts the PDSCH channel according to its own TTI type. If the RAR is not sent to the TTI of the TTI type, the data is incorrect and the RAR is discarded. Otherwise, the RAR is considered to correspond to its own TTI type.
  • step 103 and step 104 the following operations can also be performed:
  • the user equipment sends the third message to the base station when the six TTIs after receiving the RAR ends.
  • the legacy UE will send a message 3 (Msg3) in the 6th subframe after receiving the RAR, and the UE with the short TTI should send the message 3 after receiving the 6th TTI after the RAR.
  • Msg3 message 3
  • the UE shall initiate a contention resolution timer, mac-ContentionResolutionTimer, whose value is configured by the base station.
  • the unit of the timer value is a subframe, and for a UE with a short TTI, the unit of the timer value is TTI (0.5 ms or less).
  • the subsequent operation of the random access procedure is similar to the traditional random access procedure, and is not described here.
  • the base station can distinguish which TTI type user equipment is sent by the preamble sequence, and the user equipment can distinguish the received RAR, and does not cause RAR. Ambiguity or error received.
  • the delay of the random access procedure of the user equipment with short TTI can be greatly reduced.
  • the embodiment of the invention provides a random access method supporting multiple TTIs, which is applied to a base station.
  • the same content of the embodiment of the present invention and the first embodiment will not be described again.
  • FIG. 6 is a schematic diagram of a method for supporting multiple TTIs in the embodiment of the present invention, showing a situation on the base station side.
  • the random access method includes:
  • Step 601 The base station receives, by using the first message, a preamble sequence, which is sent by the user equipment, for requesting random access, where the TTI type of the user equipment is indicated by the first message.
  • Step 602 The base station sends an RAR to the user equipment by using a second message, where different TTI types correspond to different RARs.
  • the method may be a contention-based random access procedure, and the method further includes: the base station receiving the user equipment identifier sent by the user equipment by using the third message; and the base station sending the contention to the user equipment by using the fourth message. Result information.
  • the present invention is not limited thereto, and is also applicable to other types of random access procedures.
  • the base station detects a preamble sequence that may exist on the configured time-frequency resource location, and responds to the detected preamble sequence, that is, RAR.
  • the base station may send the RAR to the user equipment by using the PDCCH scrambled by the RA-RNTI when the three TTIs after receiving the preamble sequence are completed.
  • the user equipment may include: a first user equipment using a first TTI type and a second user equipment using a second TTI type; wherein the first TTI type and the second TTI type Corresponding TTIs are different and less than or equal to 1 millisecond;
  • the first user equipment and the second user equipment may both correspond to a traditional RNTI (ie, a first RA-RNTI).
  • the first user equipment may correspond to a first RA-RNTI, where the first RA-RNTI is determined by transmitting a time domain resource and a frequency domain resource of the preamble sequence;
  • the user equipment may correspond to a second RA-RNTI different from the first RA-RNTI.
  • Embodiment 2.1
  • the base station should send the corresponding RAR for different types of UEs.
  • the base station knows the configured time-frequency resource and the ZC sequence packet, and can determine the UE type corresponding to the preamble sequence according to the detected time-frequency resource location and the ZC sequence of the preamble sequence, and send different RARs.
  • the conventional RA-RNTI ie, the first RA-RNTI
  • the base station should first detect the legacy preamble sequence and then detect the format format5 to detect possible preamble sequences from legacy UEs and UEs with short TTIs, respectively, and transmit different RARs.
  • the RA-RNTI ie, the second RA-RNTI
  • the base station can detect the possible preamble sequences from the legacy UE and the UE with the short TTI and transmit different RARs by using the traditional preamble format detection.
  • the RA-RNTI ie, the second RA-RNTI
  • the base station After detecting the preamble sequence, the base station will send the RAR to the detected UE after 3 TTIs (3 ms for legacy UEs and shorter time for UEs with short TTIs).
  • the Random Access Preamble IDentit (FID) field in the RAR indicates the sequence number of the ZC sequence, ranging from 0 to 63, and the new 64 ZC sequences are shared with the conventional 64 ZC sequences. These 64 serial numbers.
  • the UL Grant (Uplink Grant) field is a resource location scheduled for the UE, and the UL Grant in the RAR sent to the UE with the short TTI is scheduled according to the shortened TTI.
  • the Backoff Indicator (BI) field indicates the backoff time of the UE, and should be configured to a smaller value for a UE with a short TTI.
  • Embodiment 2.2
  • the base station may transmit two RARs for each detected preamble sequence (for the legacy UE and the 0.5 ms TTI UE respectively), but the present invention is not limited thereto. For example, you can also send more RARs.
  • the base station may share some (or all) time-frequency resources and ZC sequence resources for legacy UEs and UEs with short TTIs. After the base station detects the preamble sequence on the resource, it is considered that there may be both the legacy UE and the A UE with a short TTI transmits a preamble sequence. The base station will allocate uplink grants (UL Grants) to both legacy UEs and UEs with short TTIs, one of which may be wasted.
  • UL Grants uplink grants
  • the base station sends two RARs to one received preamble sequence, and the UE can correctly receive the RAR corresponding to itself in two ways:
  • Manner 1 The traditional UE adopts the traditional RA-RNTI (first RA-RNTI) calculation method, and the UE with the short TTI adopts the newly defined RA-RNTI (second RA-RNTI) calculation method of the present invention.
  • the base station scrambles the RARs with different RA-RNTIs.
  • the UE descrambles the PDCCH with the RA-RNTI, the RAR of the legacy UE and the RAR of the short TTI UE can be distinguished.
  • Mode 2 The UE receives all RARs in the RAR time window and decrypts the PDSCH channel according to its own TTI type. If the RAR is not sent to the TTI of the TTI type, the data is incorrect and the RAR is discarded. Otherwise, the RAR is considered to correspond to its own TTI type.
  • the base station can distinguish which TTI type user equipment is sent by the preamble sequence, and the user equipment can distinguish the received RAR, and does not cause RAR. Ambiguity or error received.
  • the delay of the random access procedure of the user equipment with short TTI can be greatly reduced.
  • the embodiment of the present invention provides a random access device that supports multiple TTIs, and is configured in a user equipment.
  • the embodiment of the present invention corresponds to the random access method of Embodiment 1, and the same content is not described again.
  • FIG. 7 is a schematic diagram of a random access device supporting multiple TTIs according to an embodiment of the present invention. As shown in FIG. 7, the random access device 700 includes:
  • the random request sending unit 701 sends a preamble sequence for requesting random access to the base station by using the first message, where the TTI type of the user equipment is indicated by the first message;
  • the random response receiving unit 702 receives an RAR that is sent by the base station by using a second message, where different TTI types correspond to different RARs.
  • FIG. 8 is another schematic diagram of a random access device supporting multiple TTIs according to an embodiment of the present invention.
  • the random access device 800 includes: a random request sending unit 701 and a random response receiving unit 702, as shown in FIG. Said.
  • the random access device 800 may further include:
  • the identifier sending unit 801 sends a user equipment identifier to the base station by using a third message for contention;
  • the result receiving unit 802 receives the contention result information sent by the base station by using the fourth message.
  • the user equipment may include: a first user equipment using a first TTI type and a second user equipment using a second TTI type; wherein the first TTI type and the second TTI type The corresponding TTI is different and less than or equal to 1 millisecond.
  • multiple TTI types are distinguished by resources occupied by the preamble sequence; the resources include one or any combination of the following: a time domain resource, a frequency domain resource, and a sequence resource.
  • the time domain resource in which the first user equipment sends the preamble sequence is different from and orthogonal to the time domain resource in which the second user equipment sends the preamble sequence; wherein the first user equipment uses the first a time domain resource table, where the second user equipment uses a second time domain resource table; in the first time domain resource table and the second time domain resource table, the same physical random access channel configuration index is different Subframe number.
  • the frequency domain resource in which the first user equipment sends the preamble sequence is different from the frequency domain resource in which the second user equipment sends the preamble sequence and is orthogonal to each other; wherein the first user equipment uses the first The parameter selects to send the frequency domain resource of the preamble sequence, and the second user equipment uses the second parameter to select to send the frequency domain resource of the preamble sequence.
  • the ZC sequence in the preamble sequence sent by the first user equipment is different from the ZC sequence in the preamble sequence sent by the second user equipment; wherein, the first part of the 64 ZC sequences corresponds to The first user equipment, the second part of the 64 ZC sequences corresponds to the second user equipment.
  • multiple TTI types are distinguished by the format or content of the preamble sequence.
  • the length of the preamble sequence used by the first user equipment is different from the length of the preamble sequence used by the second user equipment; wherein the length of the preamble sequence adopted by the first user equipment is 1 millisecond, 2 milliseconds, or 3 milliseconds, the length of the preamble sequence adopted by the second user equipment is 0.5 milliseconds; and the second user equipment randomly selects one time slot among the plurality of available time slots to transmit the preamble sequence.
  • the length of the preamble sequence adopted by the first user equipment is the same as the length of the preamble sequence used by the second user equipment, but the format is different.
  • the ZC sequence in the preamble sequence used by the first user equipment is different from the ZC sequence in the preamble sequence used by the second user equipment; wherein the first user equipment corresponds to 64 first ZC sequences. And generating different 64 second ZC sequences for the second user equipment.
  • the random request sending unit 701 fails to send the first message indicating the TTI type. In the case of the first message, the TTI type may not be sent.
  • the random response receiving unit 702 starts listening to the PDCCH scrambled by the RA-RNTI when the three TTIs after the random request sending unit 701 sends the preamble sequence ends;
  • the identifier sending unit 801 sends the third message to the base station when the six TTIs after receiving the random access response ends.
  • the first user equipment and the second user equipment may both correspond to the first RA-RNTI.
  • the first user equipment and the second user equipment may perform descrambling on the PDCCH by using the first RA-RNTI.
  • the first user equipment may correspond to a first RA-RNTI, where the first RA-RNTI is determined by transmitting a time domain resource and a frequency domain resource of the preamble sequence;
  • the user equipment corresponds to a second RA-RNTI different from the first RA-RNTI.
  • the first user equipment may use the first RA-RNTI to descramble the PDCCH, and the second user equipment may use the second RA-RNTI to descramble the PDCCH.
  • the PDSCH can also be decoded according to the PDCCH indication.
  • the embodiment of the invention further provides a user equipment, which is configured with the random access device 700 or 800 as described above.
  • FIG. 9 is a schematic diagram of a user equipment according to an embodiment of the present invention.
  • the user device 900 can include a central processing unit 100 and a memory 140; the memory 140 is coupled to the central processing unit 100.
  • the figure is exemplary; other types of structures may be used in addition to or in place of the structure to implement telecommunications functions or other functions.
  • the functionality of the random access device 700 or 800 can be integrated into the central processor 100.
  • the central processing unit 100 may be configured to implement a random access method supporting multiple TTIs as described in Embodiment 1.
  • the random access device 700 or 800 can be configured separately from the central processing unit 100, for example, the random access device 700 or 800 can be configured as a chip connected to the central processing unit 100, controlled by a central processing unit. The function of the random access device 700 or 800 is implemented.
  • the user equipment 900 may further include: a communication module 110, an input unit 120, an audio processing unit 130, a memory 140, a camera 150, a display 160, and a power source 170.
  • the functions of the above components are similar to those of the prior art, and are not described herein again. It should be noted that the user equipment 900 does not have to include all the components shown in FIG. 9, and the above components are not required; in addition, the user equipment 900 may further include components not shown in FIG. There are technologies.
  • the base station can distinguish which TTI type user equipment is sent by the preamble sequence, and the user equipment can distinguish the received RAR, and does not cause RAR. Ambiguity or error received.
  • the delay of the random access procedure of the user equipment with short TTI can be greatly reduced.
  • the embodiment of the invention provides a random access device supporting multiple TTIs, which is configured in a base station.
  • the embodiment of the present invention corresponds to the random access method of Embodiment 2, and the same content is not described again.
  • FIG. 10 is a schematic diagram of a random access device supporting multiple TTIs according to an embodiment of the present invention. As shown in FIG. 10, the random access device 1000 includes:
  • the random request receiving unit 1001 receives, by using the first message, a preamble sequence for requesting random access, which is sent by the user equipment, where the TTI type of the user equipment is indicated by the first message;
  • the random response sending unit 1002 sends an RAR to the user equipment by using a second message, where different TTI types correspond to different RARs.
  • the random access device 1100 includes: a random request receiving unit 1001 and a random response sending unit 1002, as shown in FIG. Said.
  • the random access device 1100 may further include:
  • the identifier receiving unit 1101 receives a user equipment identifier sent by the user equipment by using a third message
  • the result sending unit 1102 sends the contention result information to the user equipment by using the fourth message.
  • the random response sending unit 1002 sends the PDCCH that is scrambled by the RA-RNTI to the PDCCH that is scrambled by the RA-RNTI when the three TTIs after the random sequence receiving unit 1001 receives the preamble sequence The user equipment.
  • the user equipment may include: a first user equipment using a first TTI type and a second user equipment using a second TTI type; wherein the first TTI type and the second TTI type Corresponding TTIs are different and less than or equal to 1 millisecond;
  • the first user equipment and the second user equipment may both correspond to the first RA-RNTI.
  • the first user equipment may correspond to a first RA-RNTI, and the first RA-RNTI is sent by using a time domain resource and a frequency domain resource of the preamble sequence. Determining; the second user equipment may correspond to a second RA-RNTI different from the first RA-RNTI.
  • the random response sending unit 1002 is further configured to send, according to the received one of the preamble sequences, a plurality of RARs corresponding to the multiple TTI types.
  • the embodiment of the invention further provides a base station, which is configured with the random access device 1000 or 1100 as described above.
  • FIG. 12 is a schematic diagram of a structure of a base station according to an embodiment of the present invention.
  • base station 1200 can include a central processing unit (CPU) 200 and memory 210; and memory 210 is coupled to central processing unit 200.
  • the memory 210 can store various data; in addition, a program for information processing is stored, and the program is executed under the control of the central processing unit 200.
  • the functions of the random access device 1000 or 1100 can be integrated into the central processing unit 200.
  • the central processing unit 200 can be configured to implement a random access method supporting multiple TTIs as described in Embodiment 2.
  • the base station 1200 may further include: a transceiver 220, an antenna 230, and the like; wherein the functions of the foregoing components are similar to those of the prior art, and details are not described herein again. It should be noted that the base station 1200 does not have to include all the components shown in FIG. 12; in addition, the base station 1200 may further include components not shown in FIG. 12, and reference may be made to the prior art.
  • the base station can distinguish which TTI type user equipment is sent by the preamble sequence, and the user equipment can distinguish the received RAR, and does not cause RAR. Ambiguity or error received.
  • the delay of the random access procedure of the user equipment with short TTI can be greatly reduced.
  • the embodiment of the present invention further provides a communication system that supports multiple TTIs, and the same content of the embodiment of the present invention is not described herein.
  • FIG. 13 is a schematic diagram of a communication system according to an embodiment of the present invention. As shown in FIG. 13, the communication system 1300 includes a base station 1301 and a user equipment 1302.
  • the user equipment 1302 sends a preamble sequence for requesting random access by using a first message, where the TTI type of the user equipment 1302 is indicated by the first message, and the base station 1301 receives the user equipment by using the first message.
  • the preamble sequence sent by 1302; and the base station 1301 sends an RAR to the user equipment 1302 by using a second message; wherein different TTI types correspond to different RARs; and the user equipment 1302 receives the RAR sent by the second message.
  • An embodiment of the present invention provides a computer readable program, wherein when the program is executed in a user equipment, the program causes a computer to perform a random connection supporting multiple TTIs as described in Embodiment 1 in the user equipment. Into the method.
  • An embodiment of the present invention provides a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a random access method supporting multiple TTIs as described in Embodiment 1 in a user equipment.
  • An embodiment of the present invention provides a computer readable program, wherein when the program is executed in a base station, the program causes a computer to perform a random access method supporting multiple TTIs as described in Embodiment 2 in the base station .
  • An embodiment of the present invention provides a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a random access method supporting multiple TTIs as described in Embodiment 2 in a base station.
  • the above apparatus and method of the present invention may be implemented by hardware or by hardware in combination with software.
  • the present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps.
  • the present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.
  • One or more of the functional blocks described in the figures and/or one or more combinations of functional blocks may be implemented as a general purpose processor, digital signal processor (DSP) for performing the functions described herein.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • One or more of the functional blocks described with respect to the figures and/or one or more combinations of functional blocks may also be implemented as a combination of computing devices, eg, a combination of a DSP and a microprocessor, multiple microprocessors One or more microprocessors in conjunction with DSP communication or any other such configuration.

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Abstract

一种支持多种TTI的随机接入方法、装置以及通信系统。所述随机接入方法包括：用户设备通过第一消息向基站发送用于请求随机接入的前导序列；其中通过所述第一消息指示所述用户设备的TTI类型；用户设备接收所述基站通过第二消息发送的随机接入应答；其中不同的TTI类型对应不同的所述随机接入应答。由此，可以大大降低具有短TTI的用户设备的随机接入过程的时延。

Description

支持多种传输时间间隔的随机接入方法、装置以及通信系统 技术领域
本发明涉及通信技术领域，特别涉及一种长期演进(LTE，Long Term Evolution)系统中的支持多种传输时间间隔(TTI，Transmission Time Interval)的随机接入方法、装置以及通信系统。
背景技术
下一代移动通信网络中将要出现的自动驾驶、工业自动化控制等实时业务对传输时延有很高的要求，例如要求端到端的时延在1ms到10ms之间。这些业务由LTE系统承载时，就给网络的时延性能带来了较大的挑战。此外，对于传统的传输控制协议(TCP，Transmission Control Protocol)业务而言，降低端到端的时延可以显著提高系统的吞吐量。从这两方面考虑，LTE系统迫切需要降低用户业务的端到端时延。
第3代合作伙伴计划(3GPP，3rd Generation Partnership Project)正在研究通过缩短TTI从而降低端到端时延的方法。传统(legacy)用户设备(UE，User Equipment)采用的TTI为1ms，与子帧(subframe)的长度相同，即调度数据的基本时间单位是1ms。如果在最新版本的UE中支持缩短的TTI，例如TTI为0.5ms或者更短的时间，业务的端到端时延就会明显降低。传统系统中往返时间(RTT，Round Trip Time)为8个TTI。缩短TTI后，RTT就会由原来的8ms变为4ms，甚至更短。
这样在LTE的小区内，就同时存在传统UE(legacy UE)和具有短TTI的UE(shorter TTI UE)。LTE系统的设计需要保持后向兼容性，保证传统UE和具有短TTI的UE能同时工作而互不影响。
应该注意，上面对技术背景的介绍只是为了方便对本发明的技术方案进行清楚、完整的说明，并方便本领域技术人员的理解而阐述的。不能仅仅因为这些方案在本发明的背景技术部分进行了阐述而认为上述技术方案为本领域技术人员所公知。
发明内容
但是，发明人发现：如果多种TTI类型的用户设备按照现有协议进行随机接入，则基站不能区别前导序列(Preamble)由哪种TTI类型的用户设备发送，并且用户设 备由于无法区别接收到的随机接入应答(RAR，Radom Access Response)，也可能造成RAR接收的歧义或错误。
本发明实施例提供一种支持多种TTI的随机接入方法、装置以及通信系统。允许具有短TTI的用户设备在随机接入过程中的消息采用短TTI传输。
根据本发明实施例的第一个方面，提供一种支持多种TTI的随机接入方法，应用于用户设备，所述随机接入方法包括：
用户设备通过第一消息向基站发送用于请求随机接入的前导序列；其中通过所述第一消息指示所述用户设备的TTI类型；
用户设备接收所述基站通过第二消息发送的随机接入应答；其中不同的TTI类型对应不同的所述随机接入应答。
根据本发明实施例的第二个方面，提供一种支持多种TTI的随机接入装置，配置于用户设备中，所述随机接入装置包括：
随机请求发送单元，通过第一消息向基站发送用于请求随机接入的前导序列；其中通过所述第一消息指示所述用户设备的TTI类型；
随机响应接收单元，接收所述基站通过第二消息发送的随机接入应答；其中不同的TTI类型对应不同的所述随机接入应答。
根据本发明实施例的第三个方面，提供一种支持多种TTI的随机接入方法，应用于基站，所述随机接入方法包括：
基站通过第一消息接收用户设备发送的用于请求随机接入的前导序列；其中通过所述第一消息指示所述用户设备的TTI类型；
基站通过第二消息向所述用户设备发送随机接入应答；其中不同的TTI类型对应不同的所述随机接入应答。
根据本发明实施例的第四个方面，提供一种支持多种TTI的随机接入装置，配置于基站中，所述随机接入装置包括：
随机请求接收单元，通过第一消息接收用户设备发送的用于请求随机接入的前导序列；其中通过所述第一消息指示所述用户设备的TTI类型；
随机响应发送单元，通过第二消息向所述用户设备发送随机接入应答；其中不同的TTI类型对应不同的所述随机接入应答。
根据本发明实施例的第五个方面，提供一种通信系统，支持多种TTI，所述通信 系统包括：
用户设备，通过第一消息发送用于请求随机接入的前导序列；其中通过所述第一消息指示所述用户设备的TTI类型；以及接收通过第二消息发送的随机接入应答；
基站，通过所述第一消息接收所述用户设备发送的所述前导序列；以及通过所述第二消息向所述用户设备发送所述随机接入应答；其中不同的TTI类型对应不同的所述随机接入应答。
根据本发明实施例的又一个方面，提供一种计算机可读程序，其中当在用户设备中执行所述程序时，所述程序使得计算机在所述用户设备中执行如上所述的随机接入方法。
根据本发明实施例的又一个方面，提供一种存储有计算机可读程序的存储介质，其中所述计算机可读程序使得计算机在用户设备中执行如上所述的随机接入方法。
根据本发明实施例的又一个方面，提供一种计算机可读程序，其中当在基站中执行所述程序时，所述程序使得计算机在所述基站中执行如上所述的随机接入方法。
根据本发明实施例的又一个方面，提供一种存储有计算机可读程序的存储介质，其中所述计算机可读程序使得计算机在基站中执行如上所述的随机接入方法。
本发明实施例的有益效果在于，通过发送前导序列的第一消息指示用户设备的TTI类型，基站能够区别前导序列由哪种TTI类型的用户设备发送，并且用户设备能够区别接收到的RAR，不会造成RAR接收的歧义或错误。可以大大降低具有短TTI的用户设备的随机接入过程的时延。
参照后文的说明和附图，详细公开了本发明的特定实施方式，指明了本发明的原理可以被采用的方式。应该理解，本发明的实施方式在范围上并不因而受到限制。在所附权利要求的精神和条款的范围内，本发明的实施方式包括许多改变、修改和等同。
针对一种实施方式描述和/或示出的特征可以以相同或类似的方式在一个或更多个其它实施方式中使用，与其它实施方式中的特征相组合，或替代其它实施方式中的特征。
应该强调，术语“包括/包含”在本文使用时指特征、整件、步骤或组件的存在，但并不排除一个或更多个其它特征、整件、步骤或组件的存在或附加。
附图说明
参照以下的附图可以更好地理解本发明的很多方面。附图中的部件不是成比例绘制的，而只是为了示出本发明的原理。为了便于示出和描述本发明的一些部分，附图中对应部分可能被放大或缩小。
在本发明的一个附图或一种实施方式中描述的元素和特征可以与一个或更多个其它附图或实施方式中示出的元素和特征相结合。此外，在附图中，类似的标号表示几个附图中对应的部件，并可用于指示多于一种实施方式中使用的对应部件。
图1是本发明实施例1的支持多种TTI的随机接入方法的一示意图；
图2是本发明实施例1的支持多种TTI的随机接入方法的另一示意图；
图3是本发明实施例1的与传统格式长度不同的前导序列的一示意图；
图4是本发明实施例1的与传统格式长度相同的前导序列的一示意图；
图5是本发明实施例1的为具有短TTI的UE所占用的64个序列进行分组的一示意图；
图6是本发明实施例2的支持多种TTI的随机接入方法的一示意图；
图7是本发明实施例3的支持多种TTI的随机接入装置的一示意图；
图8是本发明实施例3的支持多种TTI的随机接入装置的另一示意图；
图9是本发明实施例3的用户设备的一示意图；
图10是本发明实施例4的支持多种TTI的随机接入装置的一示意图；
图11是本发明实施例4的支持多种TTI的随机接入装置的另一示意图；
图12是本发明实施例4的基站的一示意图；
图13是本发明实施例5的通信系统的一示意图。
具体实施方式
参照附图，通过下面的说明书，本发明的前述以及其它特征将变得明显。在说明书和附图中，具体公开了本发明的特定实施方式，其表明了其中可以采用本发明的原则的部分实施方式，应了解的是，本发明不限于所描述的实施方式，相反，本发明包括落入所附权利要求的范围内的全部修改、变型以及等同物。
LTE的随机接入过程(以基于竞争的随机接入为例说明)主要包括4个步骤：UE通过消息1发送前导序列，向基站(例如eNB)发起随机接入过程；基站通过消息2发送RAR，为UE提供定时同步和上行资源授权(UL Grant)；UE通过消息3向 基站提供ID(identification)，用于和其他UE进行竞争解决；基站通过消息4通知接入成功的UE。
在随机接入过程中，RAR会在消息1之后的3个TTI开始发送，消息3会在收到RAR之后的6个TTI发送。从时延角度考虑，如果具有短TTI的UE在随机接入过程中的上述4条消息中就采用缩短的TTI进行传输，那么随机接入过程的时延就会显著降低。
以失去同步的连接态UE为例，传统随机接入过程的下行和上行时延分别为13.5ms和10.5ms。如果在随机接入过程中就可以采用0.5ms的TTI传输，该过程的时延可以减少到约为原来的一半，即6.5ms和5ms。这对于失去同步的UE进行上行或下行数据传输时降低时延有重要意义。因此，需要在随机接入过程中支持多种TTI类型的UE同时接入网络，且保证互相兼容。
假设小区内的所有UE已经通过小区广播的系统信息知道基站所支持的TTI类型，且具有短TTI的UE已经选择工作在一种短TTI模式下。此时发起的随机接入过程可能来自于传统UE，也可能来自具有短TTI的UE(并且可能存在多种具有短TTI的UE，例如TTI为0.5ms、0.14ms等)。
然而，根据现有协议中规定的UE行为，消息1中UE发送的preamble所使用的随机接入信道资源以及可使用的preamble序列都是由基站为所有UE统一配置的。基站在配置的资源位置上检测可能出现的preamble序列，并根据检测到preamble所在的时频资源位置和序列特征来做出不同的RAR。而目前这些资源和序列都是为传统UE定义的，基站不能区分出检测到的preamble是哪种TTI类型的UE。
此外，UE发送消息1后会在一个接收窗口内接收可能到达的RAR。但是，如果传统UE和具有短TTI的UE选择的随机接入时频资源位置和preamble序列都恰好相同，那么RAR的加扰序列即随机接入无线网络临时标识(RA-RNTI)以及其标志位RAPID字段就是完全相同的。某个UE无法区分收到的RAR是发送给传统UE的还是短TTI UE的，就可能会造成RAR接收的歧义或错误。
因此，需要为随机接入过程设计单独的方法用以支持多种TTI类型的UE，主要包括通过preamble区分UE的TTI类型的方法和区分发给不同TTI类型UE的RAR的方法。
在本发明中，一方面，为了在基站发送RAR时就可以对具有短TTI的UE采用 相应的短TTI模式传输，可以尽早通知基站发起随机接入的UE类型。也就是，在消息1中携带UE的TTI类型信息，使基站可以区分该preamble是哪种类型的UE所发送的。另一方面，基站可以为不同类型的UE发送不同类型的RAR消息，并保证相应UE正确接收到对应的RAR。
以下以基于竞争的随机接入为例，对本发明进行说明，但本发明不限于此，例如还可以应用于非竞争的随机接入过程。
实施例1
本发明实施例提供一种支持多种TTI的随机接入方法，应用于用户设备。
图1是本发明实施例的支持多种TTI的随机接入方法的一示意图，示出了用户设备侧的情况。如图1所示，所述随机接入方法包括：
步骤101，用户设备通过第一消息向基站发送用于请求随机接入的前导序列；其中通过所述第一消息指示所述用户设备的TTI类型；
步骤102，用户设备接收所述基站通过第二消息发送的RAR；其中不同的所述TTI类型对应不同的RAR。
图2是本发明实施例的支持多种TTI的随机接入方法的另一示意图，示出了当采用基于竞争的随机接入过程时用户设备和基站交互的情况。如图2所示，所述随机接入方法包括：
步骤201，用户设备通过第一消息向基站发送用于请求随机接入的前导序列；其中通过所述第一消息指示所述用户设备的TTI类型；
步骤202，基站通过第二消息向用户设备发送RAR；其中不同的所述TTI类型对应不同的RAR。
如图2所示，可选地所述随机接入方法还可以包括：
步骤203，用户设备通过第三消息向所述基站发送用户设备标识以用于竞争解决；
步骤204，基站通过第四消息向用户设备发送竞争结果信息。
在本实施例中，所述用户设备包括：使用第一TTI类型的第一用户设备以及使用第二TTI类型的第二用户设备；其中所述第一TTI类型和所述第二TTI类型所对应的TTI不同且小于或等于1毫秒。
其中，第一用户设备可以是一个或多个使用第一TTI类型的一类用户设备，第二 用户设备可以是一个或多个使用第二TTI类型的一类用户设备。基站为某一类用户设备统一配置资源。
以下以第一用户设备为TTI是1毫秒的用户设备(即传统UE)，第二用户设备为TTI小于1毫秒(例如为0.5ms)的用户设备(即具有短TTI的UE)为例进行说明；其中可能存在多种具有短TTI的UE。
用户设备发起随机接入时，选择在一个可用的资源上发送一个前导序列作为第一消息(消息1)，基站会在所有前导序列的时频资源上检测并接收该前导序列。用户设备的TTI类型可以通过前导序列所使用的资源进行区分；也可以通过前导序列的格式或内容来区分。
在一个实施方式(即实施方式1.1)中，可以通过所述前导序列所占用的资源来区分多种TTI类型；所述资源包括如下一种或任意组合：时域资源、频域资源和序列资源。
具体地，UE选择由基站配置的可用时域资源、可用频域资源以及可选的ZC(Zadoff-Chu)序列(总共64个)，进而发送前导序列。因此可以使用三种方法区分不同TTI类型UE的前导序列：为具有短TTI的UE分配独占的时域资源；为具有短TTI的UE分配独占的频域资源；为具有短TTI的UE分配独占的ZC序列。这三种方法可以使用其中任意一种，也可以多种方法同时组合使用。
实施方式1.1.1
所述第一用户设备发送所述前导序列的时域资源与所述第二用户设备发送所述前导序列的时域资源不同且相互正交。
例如，所述第一用户设备使用第一时域资源表，所述第二用户设备使用第二时域资源表；在所述第一时域资源表和所述第二时域资源表中，相同的物理随机接入信道(PRACH，Physical Random Access Channel)配置索引(Configuration Index)对应不同的子帧号(subframe number)。
具体地，传统UE根据基站配置的参数prach-ConfigIndex，查找TS 36.211协议中表格5.7.1-2中可用的子帧号，即时域资源。
表1：传统UE使用的时域资源表(同TS 36.211Table 5.7.1-2)
Figure PCTCN2015087502-appb-000001
为了与传统UE相区分，具有短TTI的UE所使用的时域资源(即子帧号)应该 与同一个prach-ConfigIndex下对应传统UE可用的时域资源相互正交。也就是说，基站为所有UE配置相同的prach-ConfigIndex，但传统UE和具有短TTI的UE所指示的可用子帧号的集合完全不同(即无交集)。
实现方法之一可以是定义一个新的时域资源表格，例如表2所示，与TS 36.211协议中表格5.7.1-2中并列对应。具有短TTI的UE在选择发送前导序列的时域资源时，仅在表2中查找。特别地，表格的具体内容不限于表2，只要满足与传统UE的查找表格正交即可。同样地，实现方式不限于通过配置单独时域资源表的方法，任何其他方法使得具有短TTI的UE选择与传统UE选择相互正交的时域资源均属于本发明的范围。
表2：短TTI UE使用的时域资源表(本发明新定义)
Figure PCTCN2015087502-appb-000002
Figure PCTCN2015087502-appb-000003
值得注意的是，表2仅示意性示出了本发明采用时域资源区分前导序列的情况，但本发明不限于此，例如还可以适当调整表2的具体内容。
实施方式1.1.2
所述第一用户设备发送所述前导序列的频域资源与所述第二用户设备发送所述前导序列的频域资源不同且相互正交。
例如，所述第一用户设备使用第一参数选择发送所述前导序列的频域资源，所述第二用户设备使用第二参数选择发送所述前导序列的频域资源。
具体地，传统UE根据基站配置的参数prach-FreqOffset(第一参数)，选择发送前导序列的频域资源。在系统带宽大于1.4MHz的情况下，可以为具有短TTI的UE增加新的频域资源，并与传统UE使用的频域资源相互正交。
基站在参数PRACH-Config内增加新的参数prach-FreqOffset-shorterTTI(第二参数)，用以指示具有短TTI的UE使用的频域，参数范围例如为0到94。而传统UE可以忽略该参数prach-FreqOffset-shorterTTI。
实施方式1.1.3
所述第一用户设备发送的所述前导序列中的ZC序列与所述第二用户设备发送的所述前导序列中的ZC序列不同；
例如，64个ZC序列中的第一部分对应于所述第一用户设备，所述64个ZC序列中的第二部分对应于所述第二用户设备。
具体地，传统UE根据基站配置的参数在64个ZC序列中选择一个作为前导序列发送。除去用于非竞争随机接入的序列外，numberOfRA-Preambles个序列为传统UE所使用，其中sizeOfRA-PreamblesGroupA个序列属于GroupA，其余为GroupB。
如果小区内同时存在传统UE和具有短TTI的UE，基站增加新的参数用以表征具有短TTI的UE可以使用的ZC序列，这些序列应属于传统UE可用序列之外的部 分。
例如，为第一种具有短TTI的UE定义参数numberOfRA-Preambles-TTItype1，此外定义sizeOfRA-PreamblesGroupA-TTItype1；为第二种具有短TTI的UE定义参数numberOfRA-Preambles-TTItype2，此外定义sizeOfRA-PreamblesGroupA-TTItype2。类似地，可以为更多类型的具有短TTI的UE定义多组参数，用以规定其使用的ZC序列范围。
由此，传统UE以及不同TTI类型的UE之间使用的ZC序列互不重合。例如，64个序列中最开始的numberOfRA-Preambles个序列为传统UE所使用，在其后numberOfRA-Preambles-TTItype1个序列为第一种具有短TTI的UE所使用，在其后numberOfRA-Preambles-TTItype2个序列为第二种具有短TTI的UE所使用。每种TTI类型的UE所使用的ZC序列中前一部分被定义为属于GroupA，其大小用参数sizeOfRA-PreamblesGroupA-TTItype1、sizeOfRA-PreamblesGroupA-TTItype2等定义。该类型UE所使用序列的后半部分属于GroupB。
在另一个实施方式(即实施方式1.2)中，可以通过所述前导序列的格式或内容来区分多种TTI类型。
具体地，传统UE根据基站配置的prach-ConfigIndex，查找TS 36.211协议中表格5.7.1-2中应该使用的前导序列格式，包括format 0，format1，format2，format3等。可以通过设计新的前导序列格式为具有短TTI的UE所特有，用来与传统UE作区分。新的格式应该与传统的前导序列具有很好的互相关性，可以同时传输传统格式和新格式而相互干扰很小。其中，新格式与传统格式的前导序列的长度不一定相同。关于新的前导序列格式的具体设计不属于本发明范畴，以下仅以三种新格式的特征为例，针对不同的格式定义相应的随机接入方法。
实施方式1.2.1
所述第一用户设备采用的前导序列的长度与所述第二用户设备采用的前导序列的长度不同。
其中，所述第一用户设备采用的前导序列的长度为1毫秒、2毫秒或3毫秒，所述第二用户设备采用的前导序列的长度为0.5毫秒；以及所述第二用户设备在多个可用时隙中随机选择一个时隙发送所述前导序列。
具体地，假设存在一种新的格式format 5为具有短TTI的UE所特有，且保证与 传统的格式format0,format1，format2，format3之间互相关性很好，存在的干扰很小。format 5占用的时间长度为0.5ms，其中循环前缀(CP，Cyclic Prefix)、保护间隔(GT，Guard Time)、ZC序列的长度不做限定。
图3是本发明实施例的与传统格式长度不同的前导序列的一示意图。如图3所示，format 5占用的时间长度为0.5ms。值得注意的是，图3仅示意性示出了与现有前导序列格式不同的新格式，但本发明不限于此，例如还可以是其他长度的格式。
对于具有短TTI的UE，不论基站配置的格式是哪种(例如配置的是format 0，format 1，format 2或format 3)，都采用format 5发送前导序列。根据基站的配置，具有短TTI的UE选择一个起始子帧。根据基站配置的前导序列应该占用子帧数(即获得的时域资源)情况，在多种可用的时隙资源中，随机选择一个0.5ms时隙发送preamble：
情况1：如果基站配置为format 0(长度为1ms，即2个时隙)，则UE在起始子帧后的2个时隙中随机选择一个时隙发送；
情况2：如果基站配置为format 1、2(长度为2ms，即4个时隙)，则UE在起始子帧后的4个时隙中随机选择一个时隙发送；
情况3：如果基站配置为format 3(长度为3ms，即6个时隙)，则UE在起始子帧后的6个时隙中随机选择一个时隙发送。
在本实施方式中，UE发送前导序列所使用的资源按基站的配置进行。UE记录自己选择了第几个时隙发送，记为s_id(0<s_id≤6)，即s_id表示具有短TTI的UE在可选时域资源中发送前导序列的时隙位置。该值s_id将用于计算后述的RA-RNTI。
实施方式1.2.2
所述第一用户设备采用的前导序列的长度与所述第二用户设备采用的前导序列的长度相同但是格式不同。
例如，假设存在一些新的格式format 0a(长度为1ms，对应于format 0)、format1a(长度为2ms，对应于format 1)、format 2a(长度为2ms，对应于format 2)、format3a(长度为3ms，对应于format 3)为具有短TTI的UE所特有，且保证与对应的传统的格式format 0,format 1，format 2，format 3之间互相关性很好，存在的干扰很小。新的格式占用的时间长度与对应的传统格式相同，其中CP、GT、ZC序列的长度不做限定。
图4是本发明实施例的与传统格式长度相同的前导序列的一示意图。如图4所示，format 0a,format 1a，format 2a，format 3a占用的时间长度分别与format 0,format 1，format 2，format 3相同，但是内容(例如CP、GT、ZC的长度)不同。
对于具有短TTI的UE，根据基站配置的prach-ConfigIndex参数中规定的前导序列格式，选择与之对应的新格式。即如果传统UE选择format 0，具有短TTI的UE则选择format 0a；如果传统UE选择format 1，具有短TTI的UE则选择format 1a；诸如此类。UE发送前导序列使用资源按基站配置进行。UE此时记录s_id＝1，用于计算后述的RA-RNTI。
实施方式1.2.3
所述第一用户设备采用的前导序列中的ZC序列与所述第二用户设备采用的前导序列中的ZC序列不同；其中，所述第一用户设对应于64个第一ZC序列，以及为所述第二用户设备生成不同的64个第二ZC序列。
具体地，可以根据无线资源控制(RRC，Radio Resource Control)消息配置的rootSequenceIndex参数，首先使用根序列产生64个序列用于传统UE，如果不足64个，根据TS 36.211Table 5.7.2-4定义的根序列的顺序，利用下一个根序列产生更多的ZC序列，直到达到64个为止，其序号index为0～63。
在本实施方式中，在已经为传统UE产生的64个ZC序列(第一ZC序列)后，进一步按照根序列的顺序，再由其他根序列产生64个ZC序列(第二ZC序列)，为短TTI的UE所特有，其序号(preamble index)也是0～63，与传统UE重复编号；即一个0～63的序号对应于一个传统序列(第一ZC序列)和一个新的序列(第二ZC序列)。产生的这128个ZC序列是基站和UE都知道的。这128个ZC序列之间的互相关性很好。
具有短TTI的UE根据基站配置选择相应的前导序列格式，使用与传统UE相同的格式，但发送序列使用具有短TTI的UE所特有的64个序列。发送前导序列使用的资源按基站配置进行。UE此时记录s_id＝1，用于计算后述的RA-RNTI。
在本实施例中，还可以为具有短TTI的UE进行ZC序列的分组，适用于本发明上述中除实施方式1.1.3之外的所有实施方式。当可以通过时频资源、前导序列格式这两种方式(不依赖于ZC序列的分组)区分传统UE和具有短TTI的UE时，具有短TTI的UE可以占用64个ZC序列。为具有短TTI的UE进行分组不影响对传统 UE的分组，二者相互独立。
为具有短TTI的UE占用的这64个序列要供不同的短TTI长度的UE使用。这里假设基于非竞争的序列为传统UE和短TTI类型UE共享。通过分组要为不同TTI类型(如0.5ms、0.1ms等)的UE划分各自类型的GroupA、GroupB序列。
例如，为短TTI类型1的UE定义参数numberOfRA-Preambles-TTItype1、sizeOfRA-PreamblesGroupA-TTItype1；为短TTI类型2的UE定义参数numberOfRA-Preambles-TTItype2、sizeOfRA-PreamblesGroupA-TTItype2，依此为每种特定的短TTI类型定义参数，用来限定该类型UE可以使用的序列范围。其中numberOfRA-Preambles-TTItypei表示第i种具有短TTI的UE可以使用的ZC序列个数，sizeOfRA-PreamblesGroupA-TTItypei表示第i种具有短TTI的UE可用序列中属于其GroupA的序列个数，其余的序列属于GroupB。
图5是本发明实施例的为具有短TTI的UE所占用的64个序列进行分组的一示意图。如图5所示，第一种类型的具有短TTI的UE可以使用序号从0到numberOfRA-Preambles-TTItype1-1之间的序列，其中前sizeOfRA-PreamblesGroupA-TTItype1个序列属于Group A，其余的序列属于Group B；第二种类型的短TTI UE可以使用序号从numberOfRA-Preambles-TTItype1到numberOfRA-Preambles-TTItype1+numberOfRA-Preambles-TTItype2–1之间的序列，其中前面sizeOfRA-PreamblesGroupA-TTItype2个序列属于Group A，其余的为Group B；以此类推。
在本实施例中，用户设备在发送指示所述TTI类型的第一消息失败的情况下，还可以发送不指示所述TTI类型的第一消息。
例如，具有短TTI的UE按照上述方法发送前导序列通知基站其TTI类型时，如果多次尝试均失败，则具有短TTI的UE应按照传统UE的发送方法发送前导序列。相关TTI类型的信息可以在后续信令中传递(例如在消息3中携带TTI类型信息)，这期间使用传统的TTI进行传输。
以上对于步骤101或201进行了示意性说明，以下对于步骤102或202进行说明。
在本实施例中，用户设备在发送所述前导序列后的3个TTI结束时，开始监听被RA-RNTI加扰的物理下行控制信道(PDCCH，Physical Downlink Control Channel)。
例如，UE发送前导序列之后将在“RAR时间窗”内监听由RA-RNTI加扰的 PDCCH，以接收对应自己RA-RNTI的RAR。如果在此RAR时间窗内没有接收到基站回复的RAR，则此次随机接入过程失败。
对于传统UE而言，RAR时间窗起始于发送前导序列的子帧之后的3个子帧。而对于具有短TTI的UE，RAR时间窗在发送前导序列后的3个TTI开始(例如对于0.5ms的TTI来说，可以在1.5ms后开始接收RAR)，并持续ra-ResponseWindowSize个TTI长度。
在实施方式1.1中，所述第一用户设备和第二用户设备均可以对应第一RA-RNTI(即传统的RA-RNTI)。在实施方式1.2中，所述第一用户设备对应第一RA-RNTI，所述第一RA-RNTI由发送所述前导序列的时域资源和频域资源确定；所述第二用户设备对应不同于第一RA-RNTI的第二RA-RNTI。
例如，传统的UE计算RA-RNTI的方法为RA-RNTI＝1+t_id+10*f_id；其中t_id是UE发送前导序列所选随机接入信道资源的第一个子帧号(0≤t_id<10)；f_id是UE发送前导序列所选随机接入信道的频域(0≤f_id<6)。RA-RNTI用以区分使用不同时频资源发送preamble的UE所对应的RAR。
在本实施例中，当传统UE与具有短TTI的UE使用相同的前导序列资源时，且可能使用相同的ZC序列或相同的ZC序列序号(对于实施例1.2.3，序号index最多表示64个，而ZC序列有128个)时，可以通过RA-RNTI对传统UE和具有短TTI的UE对应的RAR进行区分。
因此，本发明实施例为具有短TTI的UE定义一种新的RA-RNTI计算方法。具有短TTI的UE所对应的RA-RNTI不仅与发送所述前导序列的时域资源、频域资源有关，还可能与发送所述前导序列的时隙位置有关。
在本实施例中，所述第二RA-RNTI的值可以为在所述第一RA-RNTI的值的基础上加上60的正整数倍。
例如，具有短TTI的UE采用如下方法计算RA-RNTI：RA-RNTI＝1+t_id+10*f_id+60*s_id。其中s_id默认值为1，如前所述，s_id表示具有短TTI的UE在可选时域资源中发送前导序列的时隙位置。可以认为传统的RA-RNTI计算公式是s_id＝0的特殊情况。
值得注意的是，以上仅示意性地说明了RA-RNTI的计算方法，但本发明不限于此。可以根据实际情况对上述计算公式进行适当地调整。可以使得新RA-RNTI与传 统RA-RNTI的取值范围不同，完全不存在交集即可。
在本实施例中，基站可以通过消息1知道发送前导序列的UE的TTI类型，或者基站可以通过核心网等其他方式了解到UE的TTI类型，基站应该为不同类型的UE发送相应的RAR。例如，基站对于第一用户设备的RAR，使用第一RA-RNTI对PDCCH进行加扰；对于第二用户设备的RAR，使用第二RA-RNTI对PDCCH进行加扰。各用户设备可以根据自己的RA-RNTI对PDCCH进行解扰。但本发明不限于此，也有可能基站采用第一RA-RNTI对各用户设备进行加扰，具体内容可以参考实施例2。
此外，基站有可能不知道发送前导序列的UE的TTI类型，在这种情况下基站可以针对接收到的一个前导序列发送对应于所述多种TTI类型的多个RAR。例如，针对每个检测到的前导序列发送两个RAR(分别针对传统UE和0.5ms TTI的UE)。
用户设备可以使用如下方式获得RAR。第一用户设备使用第一RA-RNTI对PDCCH进行解扰，第二用户设备使用第二RA-RNTI对PDCCH进行解扰；此外，还可以根据PDCCH指示进行对物理下行共享信道(PDSCH，Physical Downlink Shared Channel)进行解码。
例如，基站针对接收到的一个前导序列发送两个RAR，UE可以采用两种方式正确接收对应自己的RAR：
方式1：传统UE采用传统的RA-RNTI计算方法，具有短TTI的UE采用本发明新定义的RA-RNTI计算方法。基站将RAR分别用不同的RA-RNTI加扰。UE在用RA-RNTI解扰PDCCH时，就可以区分出传统UE的RAR和短TTI UE的RAR。
方式2：UE接收RAR时间窗内的所有RAR，按照自己的TTI类型去解密PDSCH信道。如果不是发送给自己所属TTI类型的RAR，则数据错误，丢弃该RAR，否则认为该RAR对应自己的TTI类型。
在步骤103和步骤104中，还可以进行如下操作：
用户设备在接收到所述RAR后的6个TTI结束时，向所述基站发送所述第三消息。例如，传统UE会在接收到RAR后的第6个子帧发送消息3(Msg3)，具有短TTI的UE应该在接收到RAR后的第6个TTI之后发送消息3。
一旦发送消息3，UE应启动一个竞争解决定时器mac-ContentionResolutionTimer，该定时器的数值由基站配置。对于传统UE，该定时器数值的单位是子帧，对于具有短TTI的UE，该定时器数值的单位是TTI(0.5ms或者更短)。
随机接入过程的后续操作与传统随机接入过程类似，此处不再赘述。
由上述实施例可知，通过发送前导序列的第一消息指示用户设备的TTI类型，基站能够区别前导序列由哪种TTI类型的用户设备发送，并且用户设备能够区别接收到的RAR，不会造成RAR接收的歧义或错误。可以大大降低具有短TTI的用户设备的随机接入过程的时延。
实施例2
本发明实施例提供一种支持多种TTI的随机接入方法，应用于基站。本发明实施例与实施例1相同的内容不再赘述。
图6是本发明实施例的支持多种TTI的随机接入方法的一示意图，示出了基站侧的情况，如图6所示，所述随机接入方法包括：
步骤601，基站通过第一消息接收用户设备发送的用于请求随机接入的前导序列；其中通过所述第一消息指示所述用户设备的TTI类型；
步骤602，基站通过第二消息向所述用户设备发送RAR；其中不同的TTI类型对应不同的RAR。
在本实施例中，可以是基于竞争的随机接入过程，还随机接入方法还可以包括：基站接收用户设备通过第三消息发送的用户设备标识；以及基站通过第四消息向用户设备发送竞争结果信息。但本发明不限于此，也可适用于其他类型的随机接入过程。
在本实施例中，基站在配置的时频资源位置上检测可能存在的前导序列，并对检测到的前导序列做出应答，即RAR。其中，基站可以在接收到前导序列后的3个TTI结束时，将RAR通过被RA-RNTI加扰的PDCCH发送给所述用户设备。
在本实施例中，所述用户设备可以包括：使用第一TTI类型的第一用户设备以及使用第二TTI类型的第二用户设备；其中所述第一TTI类型和所述第二TTI类型所对应的TTI不同且小于或等于1毫秒；
在上述实施方式1.1的情况下，所述第一用户设备和第二用户设备可以均对应传统的RNTI(即第一RA-RNTI)。在上述实施方式1.2的情况下，所述第一用户设备可以对应第一RA-RNTI，所述第一RA-RNTI由发送所述前导序列的时域资源和频域资源确定；所述第二用户设备可以对应不同于第一RA-RNTI的第二RA-RNTI。关于上述内容的具体实现可以参考实施例1。
下面分两种情况讨论基站的相关操作。
实施方式2.1：
如果基站可以通过消息1知道发送前导序列的UE的TTI类型或者基站可以通过核心网等其他方式了解到UE的TTI类型，基站应该为不同类型的UE发送相应的RAR。
针对实施方式1.1的情况，基站知道配置的时频资源和ZC序列分组情况，可以根据检测到前导序列的时频资源位置和ZC序列判断前导序列对应的UE类型，并发送不同的RAR。此时采用传统的RA-RNTI(即第一RA-RNTI)计算方法。
针对实施方式1.2的情况，
对于实施方式1.2.1，基站应首先检测传统前导序列格式，然后检测格式format5，以便分别检测出可能的来自传统UE和具有短TTI的UE的前导序列，并发送不同的RAR。此时，采用本发明新定义的RA-RNTI(即第二RA-RNTI)计算方法；
针对实施方式1.2.2和实施方式1.2.3的情况，基站采用传统的前导序列格式检测即可同时检测出可能的来自传统UE和具有短TTI的UE的前导序列，并发送不同的RAR。此时，采用本发明新定义的RA-RNTI(即第二RA-RNTI)计算方法；
基站在检测到前导序列后，会在3个TTI后发送RAR给检测到的UE(对于传统UE是3ms，对于具有短TTI的UE是更短的时间)。
在本实施例中，RAR中的随机接入前导序列标志(RAPID，Random Access Preamble IDentitfie)字段表示ZC序列的序号，取值从0到63，新的64个ZC序列与传统64个ZC序列共享这64个序号。上行授权(UL Grant，Uplink Grant)字段是为UE调度的资源位置，发给具有短TTI的UE的RAR中的UL Grant是按照缩短的TTI进行调度。退避指示(BI，Backoff Indicator)字段指示UE的退避时间，对于具有短TTI的UE，应配置为较小的值。
实施方式2.2：
如果基站不能通过消息1知道发送前导序列的UE的TTI类型，基站可以针对每个检测到的前导序列发送两个RAR(分别针对传统UE和0.5ms TTI的UE)，但本发明不限于此，例如还可以发送更多的RAR。
基站可以将部分(或全部)时频资源及ZC序列资源让传统UE和具有短TTI的UE共享。当基站检测到该类资源上的前导序列后，认为可能同时存在传统UE和具 有短TTI的UE发送前导序列。基站将同时为传统UE和具有短TTI的UE分配上行授权(UL Grant)，其中的一个资源可能会被浪费。
例如，基站对收到的一个前导序列发送两个RAR，UE可以采用两种方式正确接收对应自己的RAR：
方式1：传统UE采用传统的RA-RNTI(第一RA-RNTI)计算方法，具有短TTI的UE采用本发明新定义的RA-RNTI(第二RA-RNTI)计算方法。基站将RAR分别用不同的RA-RNTI加扰。UE在用RA-RNTI解扰PDCCH时，就可以区分出传统UE的RAR和短TTI UE的RAR。
方式2：UE接收RAR时间窗内的所有RAR，按照自己的TTI类型去解密PDSCH信道。如果不是发送给自己所属TTI类型的RAR，则数据错误，丢弃该RAR，否则认为该RAR对应自己的TTI类型。
由上述实施例可知，通过发送前导序列的第一消息指示用户设备的TTI类型，基站能够区别前导序列由哪种TTI类型的用户设备发送，并且用户设备能够区别接收到的RAR，不会造成RAR接收的歧义或错误。可以大大降低具有短TTI的用户设备的随机接入过程的时延。
实施例3
本发明实施例提供一种支持多种TTI的随机接入装置，配置于用户设备中。本发明实施例对应于实施例1的随机接入方法，相同的内容不再赘述。
图7是本发明实施例的支持多种TTI的随机接入装置的一示意图，如图7所示，所述随机接入装置700包括：
随机请求发送单元701，通过第一消息向基站发送用于请求随机接入的前导序列；其中通过所述第一消息指示所述用户设备的TTI类型；
随机响应接收单元702，接收所述基站通过第二消息发送的RAR；其中不同的TTI类型对应不同的RAR。
图8是本发明实施例的支持多种TTI的随机接入装置的另一示意图，如图8所示，所述随机接入装置800包括：随机请求发送单元701和随机响应接收单元702，如上所述。
如图8所示，所述随机接入装置800还可以包括：
标识发送单元801，通过第三消息向所述基站发送用户设备标识以用于竞争；
结果接收单元802，接收所述基站通过第四消息发送的竞争结果信息。
在本实施例中，所述用户设备可以包括：使用第一TTI类型的第一用户设备以及使用第二TTI类型的第二用户设备；其中所述第一TTI类型和所述第二TTI类型所对应的TTI不同且小于或等于1毫秒。
在一个实施方式中，通过所述前导序列所占用的资源来区分多种TTI类型；所述资源包括如下一种或任意组合：时域资源、频域资源和序列资源。
例如，所述第一用户设备发送所述前导序列的时域资源与所述第二用户设备发送所述前导序列的时域资源不同且相互正交；其中，所述第一用户设备使用第一时域资源表，所述第二用户设备使用第二时域资源表；在所述第一时域资源表和所述第二时域资源表中，相同的物理随机接入信道配置索引对应不同的子帧号。
再例如，所述第一用户设备发送所述前导序列的频域资源与所述第二用户设备发送所述前导序列的频域资源不同且相互正交；其中，所述第一用户设备使用第一参数选择发送所述前导序列的频域资源，所述第二用户设备使用第二参数选择发送所述前导序列的频域资源。
再例如，所述第一用户设备发送的所述前导序列中的ZC序列与所述第二用户设备发送的所述前导序列中的ZC序列不同；其中，64个ZC序列中的第一部分对应于所述第一用户设备，所述64个ZC序列中的第二部分对应于所述第二用户设备。
在另一个实施方式中，通过所述前导序列的格式或内容来区分多种TTI类型。
例如，所述第一用户设备采用的前导序列的长度与所述第二用户设备采用的前导序列的长度不同；其中，所述第一用户设备采用的前导序列的长度为1毫秒、2毫秒或3毫秒，所述第二用户设备采用的前导序列的长度为0.5毫秒；以及所述第二用户设备在多个可用时隙中随机选择一个时隙发送所述前导序列。
再例如，所述第一用户设备采用的前导序列的长度与所述第二用户设备采用的前导序列的长度相同但是格式不同。
再例如，所述第一用户设备采用的前导序列中的ZC序列与所述第二用户设备采用的前导序列中的ZC序列不同；其中，所述第一用户设备对应于64个第一ZC序列，以及为所述第二用户设备生成不同的64个第二ZC序列。
在本实施例中，所述随机请求发送单元701在发送指示TTI类型的第一消息失败 的情况下，还可以发送不指示TTI类型的第一消息。
在本实施例中，所述随机响应接收单元702在所述随机请求发送单元701发送所述前导序列后的3个TTI结束时，开始监听被RA-RNTI加扰的PDCCH；
所述标识发送单元801在所述接收到所述随机接入响应后的6个TTI结束时，向所述基站发送所述第三消息。
在本实施例中，在上述实施方式1.1的情况下，所述第一用户设备和第二用户设备可以均对应第一RA-RNTI。所述第一用户设备和所述第二用户设备均可以使用所述第一RA-RNTI对PDCCH进行解扰。
在上述实施方式1.2的情况下，所述第一用户设备可以对应第一RA-RNTI，所述第一RA-RNTI由发送所述前导序列的时域资源和频域资源确定；所述第二用户设备对应不同于第一RA-RNTI的第二RA-RNTI。所述第一用户设备可以使用所述第一RA-RNTI对PDCCH进行解扰，所述第二用户设备可以使用所述第二RA-RNTI对PDCCH进行解扰。此外，还可以根据PDCCH指示进行对PDSCH进行解码。
本发明实施例还提供一种用户设备，配置有如上所述的随机接入装置700或800。
图9是本发明实施例的用户设备的一示意图。如图9所示，该用户设备900可以包括中央处理器100和存储器140；存储器140耦合到中央处理器100。值得注意的是，该图是示例性的；还可以使用其他类型的结构，来补充或代替该结构，以实现电信功能或其他功能。
在一个实施方式中，随机接入装置700或800的功能可以被集成到中央处理器100中。其中，中央处理器100可以被配置为实现如实施例1所述的支持多种TTI的随机接入方法。
在另一个实施方式中，随机接入装置700或800可以与中央处理器100分开配置，例如可以将随机接入装置700或800配置为与中央处理器100连接的芯片，通过中央处理器的控制来实现随机接入装置700或800的功能。
如图9所示，该用户设备900还可以包括：通信模块110、输入单元120、音频处理单元130、存储器140、照相机150、显示器160、电源170。其中，上述部件的功能与现有技术类似，此处不再赘述。值得注意的是，用户设备900也并不是必须要包括图9中所示的所有部件，上述部件并不是必需的；此外，用户设备900还可以包括图9中没有示出的部件，可以参考现有技术。
由上述实施例可知，通过发送前导序列的第一消息指示用户设备的TTI类型，基站能够区别前导序列由哪种TTI类型的用户设备发送，并且用户设备能够区别接收到的RAR，不会造成RAR接收的歧义或错误。可以大大降低具有短TTI的用户设备的随机接入过程的时延。
实施例4
本发明实施例提供一种支持多种TTI的随机接入装置，配置于基站中。本发明实施例对应于实施例2的随机接入方法，相同的内容不再赘述。
图10是本发明实施例的支持多种TTI的随机接入装置的一示意图，如图10所示，所述随机接入装置1000包括：
随机请求接收单元1001，通过第一消息接收用户设备发送的用于请求随机接入的前导序列；其中通过所述第一消息指示所述用户设备的TTI类型；
随机响应发送单元1002，通过第二消息向所述用户设备发送RAR；其中不同的TTI类型对应不同的RAR。
图11是本发明实施例的支持多种TTI的随机接入装置的另一示意图，如图11所示，所述随机接入装置1100包括：随机请求接收单元1001和随机响应发送单元1002，如上所述。
如图11所示，所述随机接入装置1100还可以包括：
标识接收单元1101，接收用户设备通过第三消息发送的用户设备标识；以及
结果发送单元1102，通过第四消息向用户设备发送竞争结果信息。
在本实施例中，所述随机响应发送单元1002在所述随机请求接收单元1001接收到所述前导序列后的3个TTI结束时，将所述RAR通过被RA-RNTI加扰的PDCCH发送给所述用户设备。
在本实施例中，所述用户设备可以包括：使用第一TTI类型的第一用户设备以及使用第二TTI类型的第二用户设备；其中所述第一TTI类型和所述第二TTI类型所对应的TTI不同且小于或等于1毫秒；
在本实施例中，在上述实施方式1.1的情况下，所述第一用户设备和第二用户设备可以均对应第一RA-RNTI。在上述实施方式1.2的情况下，所述第一用户设备可以对应第一RA-RNTI，所述第一RA-RNTI由发送所述前导序列的时域资源和频域资源 确定；所述第二用户设备可以对应不同于第一RA-RNTI的第二RA-RNTI。
在本实施例中，所述随机响应发送单元1002还可以用于针对接收到的一个前导序列发送对应于所述多种TTI类型的多个RAR。
本发明实施例还提供一种基站，配置有如上所述的随机接入装置1000或1100。
图12是本发明实施例的基站的一构成示意图。如图12所示，基站1200可以包括：中央处理器(CPU)200和存储器210；存储器210耦合到中央处理器200。其中该存储器210可存储各种数据；此外还存储信息处理的程序，并且在中央处理器200的控制下执行该程序。
其中，随机接入装置1000或1100的功能可以被集成到中央处理器200中。中央处理器200可以被配置为实现如实施例2所述的支持多种TTI的随机接入方法。
此外，如图12所示，基站1200还可以包括：收发机220和天线230等；其中，上述部件的功能与现有技术类似，此处不再赘述。值得注意的是，基站1200也并不是必须要包括图12中所示的所有部件；此外，基站1200还可以包括图12中没有示出的部件，可以参考现有技术。
由上述实施例可知，通过发送前导序列的第一消息指示用户设备的TTI类型，基站能够区别前导序列由哪种TTI类型的用户设备发送，并且用户设备能够区别接收到的RAR，不会造成RAR接收的歧义或错误。可以大大降低具有短TTI的用户设备的随机接入过程的时延。
实施例5
本发明实施例还提供一种通信系统，支持多种TTI，本发明实施例与实施例1至4相同的内容不再赘述。
图13是本发明实施例的通信系统的一示意图，如图13所示，所述通信系统1300包括：基站1301和用户设备1302。
其中，用户设备1302通过第一消息发送用于请求随机接入的前导序列；其中通过所述第一消息指示所述用户设备1302的TTI类型；基站1301通过所述第一消息接收所述用户设备1302发送的所述前导序列；以及基站1301通过第二消息向所述用户设备1302发送RAR；其中不同的TTI类型对应不同的RAR；用户设备1302接收通过第二消息发送的RAR。
本发明实施例提供一种计算机可读程序，其中当在用户设备中执行所述程序时，所述程序使得计算机在所述用户设备中执行如实施例1所述的支持多种TTI的随机接入方法。
本发明实施例提供一种存储有计算机可读程序的存储介质，其中所述计算机可读程序使得计算机在用户设备中执行如实施例1所述的支持多种TTI的随机接入方法。
本发明实施例提供一种计算机可读程序，其中当在基站中执行所述程序时，所述程序使得计算机在所述基站中执行如实施例2所述的支持多种TTI的随机接入方法。
本发明实施例提供一种存储有计算机可读程序的存储介质，其中所述计算机可读程序使得计算机在基站中执行如实施例2所述的支持多种TTI的随机接入方法。
本发明以上的装置和方法可以由硬件实现，也可以由硬件结合软件实现。本发明涉及这样的计算机可读程序，当该程序被逻辑部件所执行时，能够使该逻辑部件实现上文所述的装置或构成部件，或使该逻辑部件实现上文所述的各种方法或步骤。本发明还涉及用于存储以上程序的存储介质，如硬盘、磁盘、光盘、DVD、flash存储器等。
针对附图中描述的功能方框中的一个或多个和/或功能方框的一个或多个组合，可以实现为用于执行本申请所描述功能的通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者其它可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件或者其任意适当组合。针对附图描述的功能方框中的一个或多个和/或功能方框的一个或多个组合，还可以实现为计算设备的组合，例如，DSP和微处理器的组合、多个微处理器、与DSP通信结合的一个或多个微处理器或者任何其它这种配置。
以上结合具体的实施方式对本发明进行了描述，但本领域技术人员应该清楚，这些描述都是示例性的，并不是对本发明保护范围的限制。本领域技术人员可以根据本发明的原理对本发明做出各种变型和修改，这些变型和修改也在本发明的范围内。

Claims (24)

  1. 一种支持多种传输时间间隔的随机接入装置，配置于用户设备中，所述随机接入装置包括：
    随机请求发送单元，通过第一消息向基站发送用于请求随机接入的前导序列；其中通过所述第一消息指示所述用户设备的传输时间间隔类型；
    随机响应接收单元，接收所述基站通过第二消息发送的随机接入应答；其中不同的所述传输时间间隔类型对应不同的所述随机接入应答。
  2. 根据权利要求1所述的随机接入装置，其中，所述随机接入装置还包括：
    标识发送单元，通过第三消息向所述基站发送用户设备标识以用于竞争解决；以及
    结果接收单元，接收所述基站通过第四消息发送的竞争结果信息。
  3. 根据权利要求1所述的随机接入装置，其中，所述用户设备包括：使用第一传输时间间隔类型的第一用户设备以及使用第二传输时间间隔类型的第二用户设备；
    其中所述第一传输时间间隔类型和所述第二传输时间间隔类型所对应的传输时间间隔不同且小于或等于1毫秒。
  4. 根据权利要求3所述的随机接入装置，其中，通过所述前导序列所占用的资源来区分多种传输时间间隔类型；所述资源包括如下一种或任意组合：时域资源、频域资源和序列资源。
  5. 根据权利要求4所述的随机接入装置，其中，所述第一用户设备发送所述前导序列的时域资源与所述第二用户设备发送所述前导序列的时域资源不同且相互正交；
    其中，所述第一用户设备使用第一时域资源表，所述第二用户设备使用第二时域资源表；在所述第一时域资源表和所述第二时域资源表中，相同的物理随机接入信道配置索引对应不同的子帧号。
  6. 根据权利要求4所述的随机接入装置，其中，所述第一用户设备发送所述前导序列的频域资源与所述第二用户设备发送所述前导序列的频域资源不同且相互正交；
    其中，所述第一用户设备使用第一参数选择发送所述前导序列的频域资源，所述 第二用户设备使用第二参数选择发送所述前导序列的频域资源。
  7. 根据权利要求4所述的随机接入装置，其中，所述第一用户设备发送的所述前导序列中的ZC序列与所述第二用户设备发送的所述前导序列中的ZC序列不同；
    其中，64个ZC序列中的第一部分对应于所述第一用户设备，所述64个ZC序列中的第二部分对应于所述第二用户设备。
  8. 根据权利要求3所述的随机接入装置，其中，通过所述前导序列的格式或内容来区分多种传输时间间隔类型。
  9. 根据权利要求8所述的随机接入装置，其中，所述第一用户设备采用的前导序列的长度与所述第二用户设备采用的前导序列的长度不同；
    其中，所述第一用户设备采用的前导序列的长度为1毫秒、2毫秒或3毫秒，所述第二用户设备采用的前导序列的长度为0.5毫秒；以及所述第二用户设备在多个可用时隙中随机选择一个时隙发送所述前导序列。
  10. 根据权利要求8所述的随机接入装置，其中，所述第一用户设备采用的前导序列的长度与所述第二用户设备采用的前导序列的长度相同但是格式不同。
  11. 根据权利要求8所述的随机接入装置，其中，所述第一用户设备采用的前导序列中的ZC序列与所述第二用户设备采用的前导序列中的ZC序列不同；
    其中，所述第一用户设备对应于64个第一ZC序列，以及为所述第二用户设备生成不同的64个第二ZC序列。
  12. 根据权利要求1所述的随机接入装置，其中，所述随机请求发送单元在发送指示所述传输时间间隔类型的第一消息失败的情况下，发送不指示所述传输时间间隔类型的第一消息。
  13. 根据权利要求2所述的随机接入装置，其中，所述随机响应接收单元在所述随机请求发送单元发送所述前导序列后的3个传输时间间隔结束时，开始监听被随机接入无线网络临时标识即RA-RNTI加扰的物理下行控制信道；
    所述标识发送单元在所述接收到所述随机接入响应后的6个传输时间间隔结束时，向所述基站发送所述第三消息。
  14. 根据权利要求4所述的随机接入装置，其中，所述第一用户设备和所述第二用户设备均对应第一RA-RNTI，所述第一RA-RNTI由发送所述前导序列的时域资源和频域资源确定；
    所述第一用户设备和所述第二用户设备均使用所述第一RA-RNTI对物理下行控制信道进行解扰。
  15. 根据权利要求8所述的随机接入装置，其中，所述第一用户设备对应第一RA-RNTI，所述第一RA-RNTI由发送所述前导序列的时域资源和频域资源确定；所述第二用户设备对应不同于所述第一RA-RNTI的第二RA-RNTI；
    所述第一用户设备使用所述第一RA-RNTI对物理下行控制信道进行解扰，所述第二用户设备使用所述第二RA-RNTI对物理下行控制信道进行解扰。
  16. 根据权利要求15所述的随机接入装置，其中，所述第二RA-RNTI的值为在所述第一RA-RNTI的值的基础上加上60的正整数倍。
  17. 根据权利要求15所述的随机接入装置，其中，所述第一RA-RNTI由如下公式计算：1+t_id+10*f_id；
    所述第二RA-RNTI由如下公式计算：1+t_id+10*f_id+60*s_id；
    其中，t_id为发送所述前导序列的时域资源信息，f_id为发送所述前导序列的频域资源信息，以及s_id为1或者发送所述前导序列的时隙位置。
  18. 一种支持多种传输时间间隔的随机接入装置，配置于基站中，所述随机接入装置包括：
    随机请求接收单元，通过第一消息接收用户设备发送的用于请求随机接入的前导序列；其中通过所述第一消息指示所述用户设备的传输时间间隔类型；
    随机响应发送单元，通过第二消息向所述用户设备发送随机接入应答；其中不同的所述传输时间间隔类型对应不同的所述随机接入应答。
  19. 根据权利要求18所述的随机接入装置，其中，所述随机响应发送单元在所述随机请求接收单元接收到所述前导序列后的3个传输时间间隔结束时，将所述随机接入应答通过被随机接入无线网络临时标识即RA-RNTI加扰的物理下行控制信道发送给所述用户设备。
  20. 根据权利要求19所述的随机接入装置，其中，所述用户设备包括：使用第一传输时间间隔类型的第一用户设备以及使用第二传输时间间隔类型的第二用户设备；其中所述第一传输时间间隔类型和所述第二传输时间间隔类型所对应的传输时间间隔不同且小于或等于1毫秒。
  21. 根据权利要求20所述的随机接入装置，其中，所述第一用户设备和所述第 二用户设备均对应第一RA-RNTI，所述第一RA-RNTI由发送所述前导序列的时域资源和频域资源确定；
    或者，所述第一用户设备对应所述第一RA-RNTI，所述第二用户设备对应不同于所述第一RA-RNTI的第二RA-RNTI。
  22. 根据权利要求21所述的随机接入装置，其中，所述第二RA-RNTI的值为在所述第一RA-RNTI的值的基础上加上60的正整数倍。
  23. 根据权利要求18所述的随机接入装置，其中，所述随机响应发送单元还用于针对接收到的一个前导序列发送对应于所述多种传输时间间隔类型的多个随机接入应答。
  24. 一种通信系统，支持多种传输时间间隔，所述通信系统包括：
    用户设备，通过第一消息发送用于请求随机接入的前导序列；其中通过所述第一消息指示所述用户设备的传输时间间隔类型；以及接收通过第二消息发送的随机接入应答；
    基站，通过所述第一消息接收所述用户设备发送的所述前导序列；以及通过所述第二消息向所述用户设备发送所述随机接入应答；其中不同的所述传输时间间隔类型对应不同的所述随机接入应答。
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