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WO2018099328A1 - Procédé de communication, station de base et dispositif terminal - Google Patents

Procédé de communication, station de base et dispositif terminal Download PDF

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Publication number
WO2018099328A1
WO2018099328A1 PCT/CN2017/112838 CN2017112838W WO2018099328A1 WO 2018099328 A1 WO2018099328 A1 WO 2018099328A1 CN 2017112838 W CN2017112838 W CN 2017112838W WO 2018099328 A1 WO2018099328 A1 WO 2018099328A1
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WIPO (PCT)
Prior art keywords
terminal device
frequency band
base station
high frequency
dci
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PCT/CN2017/112838
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English (en)
Chinese (zh)
Inventor
黄磊
王艺
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication date
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Publication of WO2018099328A1 publication Critical patent/WO2018099328A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present application relates to communication technologies, and in particular, to a communication method, a base station, and a terminal device.
  • the high frequency band represented by the millimeter wave band has the characteristics of large path loss, weak ability to penetrate obstacles, and severe rain attenuation at certain frequency points, which seriously restricts the application of high frequency bands.
  • the high frequency band is easy to implement a large-scale array antenna, and the beam-forming (BF) technology can bring a large directional antenna gain, thereby effectively compensating for its high path loss, which is also high.
  • BF beam-forming
  • the present application provides a communication method, a base station, and a terminal device.
  • the communication method can determine a transmit beam and a receive beam used for transmitting data in a high frequency band in a signaling interaction in a low frequency band to implement high frequency data. transmission.
  • a first aspect of the present application provides a communication method, including:
  • the base station sends the downlink reference signal DLRS and the first downlink control information DCI to the terminal device by using the low frequency band, where the first DCI includes indication information of the uplink reference signal ULRS, where the DLRS is used by the terminal device to determine the high frequency a receive beam used for receiving downlink data in a frequency band;
  • the base station uses the transmit beam to send downlink data to the terminal device on the high frequency band.
  • the method further includes: sending, by the base station, a second DCI to the terminal device by using the low frequency band, where the second DCI is used to indicate that the base station is The high frequency resource allocated by the terminal device.
  • the embodiment of the present application performs beam training through the low frequency band auxiliary high frequency band to realize high frequency data transmission.
  • the determining, by the base station, the transmit beam used for sending the downlink data on the high frequency band according to the ULRS specifically includes:
  • the base station determines an arrival angle AoA according to the ULRS
  • the base station determines, according to the AoA, the transmit beam used for transmitting downlink data.
  • the method further includes:
  • the base station receives the capability indication information reported by the terminal device by using the low frequency band, where the capability indication information includes the number of receiving beams of the terminal device on the high frequency band and/or the terminal device The number of pieces of radio frequency links on the high frequency band.
  • the method further includes: the base station sending, by using the low frequency band, a third DCI, where the third DCI includes one or more of the following information.
  • the base station transmits the high frequency resource information of the beam tracking signal BTRS, the number of base station radio frequency links or the number of beam numbers.
  • the base station determines, according to the ULRS, a transmit beam used for transmitting downlink data on a high frequency band, including:
  • the base station sends the BTRS to the terminal device by using the high frequency resource indicated by the third DCI;
  • the base station receives, by using the low frequency band, a transmit beam that is sent by the terminal device and used by the base station to send downlink data on the high frequency band.
  • the low frequency band is a dedicated component carrier.
  • the low frequency band is a subband of a component carrier.
  • the high frequency resource includes a time resource and a frequency resource.
  • a second aspect of the present application provides a communication method, including:
  • the terminal device receives, by using a low frequency band, a downlink reference signal DLRS and a first downlink control information DCI, where the first DCI is used to instruct the terminal device to send an uplink reference signal ULRS;
  • the terminal device uses the receive beam to receive downlink data sent by the base station on the high frequency band.
  • the method further includes: receiving, by the terminal device, the second DCI sent by the base station by using the low frequency band, where the second DCI is used to indicate the base station A high frequency resource allocated to the terminal device.
  • the terminal device determines, according to the DLRS, a receiving beam that is used to receive downlink data in a high frequency band, and specifically includes:
  • the terminal device determines, according to the AoA, the receive beam used to receive downlink data.
  • the method further includes: the terminal device reporting capability indication information to the base station in the low frequency band, where the capability indication information includes the terminal device At least one of the number of receiving beams on the high frequency band and/or the number of pieces of radio frequency links of the terminal device on the high frequency band.
  • the method further includes: receiving, by the terminal device, the third DCI sent by the base station by using the low frequency band, where the third DCI includes one or more of the following Information:
  • the base station transmits the high frequency resource information of the beam tracking signal BTRS, the number of base station radio link or the number of beams.
  • the method further includes:
  • the terminal device receives the BTRS sent by the terminal device by using the high frequency resource indicated by the third DCI;
  • a receive beam used for receiving downlink data in a high frequency band according to the DLRS including:
  • the terminal device Determining, by the terminal device, the transmit beam used by the base station to transmit downlink data on the high frequency band and the receive beam used by the terminal device to receive downlink data on the high frequency band according to the BTRS;
  • the high frequency resource includes a time resource and a frequency resource.
  • a third aspect of the present application provides a base station, including:
  • a sending module configured to send, by using a low frequency band, a downlink reference signal DLRS and a first downlink control information DCI, where the first DCI is used to instruct the terminal device to send an uplink reference signal ULRS;
  • the terminal device determines a receive beam used for receiving downlink data on a high frequency band;
  • a receiving module configured to receive a ULRS sent by the terminal device by using the low frequency band
  • a processing module configured to determine, according to the ULRS, a transmit beam used for transmitting downlink data on a high frequency band
  • the sending module is further configured to send downlink data to the terminal device on the high frequency band by using the sending beam.
  • the sending module is further configured to: send, by using the low frequency band, a second DCI to the terminal device, where the second DCI is used to indicate that the base station is The high frequency resources allocated by the terminal device.
  • the processing module is specifically configured to:
  • the receiving module is further configured to: receive the capability indication information reported by the terminal device by using the low frequency band, where the capability indication information includes the terminal device At least one of the number information of the receiving beam on the high frequency band and the number of pieces of the radio frequency link of the terminal device in the high frequency band.
  • the sending module is further configured to: send, by using the low frequency band, a third DCI to the terminal device, where the third DCI includes one or more of the following information:
  • the base station sends the high frequency resource information of the beam tracking signal BTRS, the number of base station radio frequency links or the number of beam numbers.
  • the sending module is specifically configured to:
  • the fourth aspect of the present application provides a terminal device, including:
  • a receiving module configured to receive, by using a low frequency band, a downlink reference signal DLRS and a first downlink control information DCI, where the first DCI includes indication information of an uplink reference signal ULRS;
  • a sending module configured to send, according to the indication information of the ULRS, a ULRS to the base station by using the low frequency band
  • a processing module configured to determine, according to the DLRS, a receive beam used for receiving downlink data in a high frequency band
  • the receiving module is further configured to receive downlink data sent by the base station on the high frequency band by using the receiving beam.
  • the receiving module is further configured to: receive, by using the low frequency band, a second DCI sent by the base station, where the second DCI is used to indicate that the base station is The high frequency resources allocated by the terminal device.
  • the processing module is specifically configured to:
  • the sending module is further configured to: report the capability indication information to the base station in the low frequency band, where the capability indication information includes that the terminal device is at the high At least one of the number of receiving beams on the frequency band and the number of pieces of radio frequency links of the terminal device on the high frequency band.
  • the receiving module is further configured to: receive, by using the low frequency band, a third DCI sent by the base station, where the third DCI includes one or more of the following information:
  • the base station sends the high frequency resource information of the beam tracking signal BTRS, the number of base station radio frequency links or the number of beam numbers.
  • the receiving module is further configured to: receive, by using the high frequency resource indicated by the third DCI, the BTRS sent by the terminal device;
  • the processing module is specifically configured to: determine, according to the BTRS, a transmit beam used by the base station to send downlink data on the high frequency band, and a receive beam used by the terminal device to receive downlink data in the high frequency band;
  • the sending module is further configured to: send information about the transmit beam to the base station by using the low frequency band.
  • the second DCI includes information indicating a high frequency transmission time unit TTU identification.
  • the second DCI includes information indicating a high frequency transmission time unit TTU allocation.
  • the low frequency band is a dedicated component carrier.
  • the low frequency band is a subband of a component carrier.
  • the high frequency resource includes a time resource and a frequency resource.
  • the fifth aspect of the present application provides a wireless communication system, including a base station and a terminal device, wherein the base station is the base station according to the third aspect, and the terminal device is the terminal device according to the fourth aspect.
  • the communication method, the base station, and the terminal device provided by the present application the base station sends the indication information of the DLRS and the ULRS to the terminal device through a dedicated low frequency band, and the information of the high frequency resource allocated by the base station to the terminal device, so that the terminal device according to the indication information of the ULRS
  • the base station transmits the ULRS through the low frequency band, and the base station determines the transmission beam used for transmitting the downlink data in the high frequency band according to the URLS, and the terminal device also determines the receiving beam used for receiving the downlink data in the high frequency band according to the DLRS, and the base station uses the high allocated for the terminal device.
  • the frequency resource and the transmit beam send downlink data to the terminal device.
  • the method performs beam training through an auxiliary high frequency band in a low frequency band to achieve high frequency According to the transmission.
  • FIG. 1 is a schematic diagram of a network system architecture applicable to an embodiment of the present application
  • Figure 3 is a schematic diagram of a low frequency band
  • Figure 4 is another schematic diagram of the low frequency band
  • FIG. 5 is a schematic structural diagram of a TTU in a low frequency band
  • FIG. 6 is a schematic diagram of transmission of DLRS
  • Figure 7 is a schematic diagram of a transmission of URLS
  • Figure 8 is a schematic diagram of comparison of low frequency TTU and high frequency TTU
  • FIG. 9 is a flowchart of a communication method according to Embodiment 2 of the present application.
  • FIG. 10 is a flowchart of a communication method according to Embodiment 3 of the present application.
  • FIG. 11 is a flowchart of a communication method according to Embodiment 4 of the present application.
  • FIG. 12 is a schematic structural diagram of a base station according to Embodiment 5 of the present application.
  • FIG. 13 is a schematic structural diagram of a terminal device according to Embodiment 6 of the present application.
  • FIG. 14 is a schematic block diagram of a base station according to Embodiment 7 of the present application.
  • FIG. 15 is a schematic block diagram of a terminal device according to Embodiment 8 of the present application.
  • FIG. 1 is a schematic diagram of a network system architecture applicable to an embodiment of the present application.
  • the network system architecture includes a base station and a terminal device, and the base station and the terminal device simultaneously support high frequency band and low frequency band communication.
  • the high frequency band and the low frequency band are relative concepts.
  • the base station can work in the 2.5GHz-3GHz band and the 4GHz-4.5GHz band, so the relatively low 2.5GHz-3GHz band can be called the low frequency band, which is relatively high.
  • the 4GHz-4.5GHz band can be called a high frequency band.
  • the terminal device involved in the present application may communicate with one or more core networks via a Radio Access Network (RAN), and the user equipment may refer to an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, Remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device.
  • RAN Radio Access Network
  • the access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol ("SSIP") phone, a Wireless Local Loop (WLL) station, and a personal digital processing (Personal Digital) Assistant, referred to as "PDA” for short, handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, UEs in future 5G networks, and the like.
  • SSIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Processing
  • the base station involved in the present application may be a network side device for communicating with a user equipment, for example, may be a base station (Base Transceiver Station, abbreviated as "BTS”) processing unit in the GSM system or CDMA, or may be a WCDMA system.
  • the base station (NodeB, abbreviated as "NB") processing unit may also be an Evolved Base Node B (“eNB” or “eNodeB”) processing unit in the LTE system, or the network device may be a relay station.
  • eNB Evolved Base Node B
  • eNodeB Evolved Base Node B
  • FIG. 2 is an interaction diagram of a communication method according to Embodiment 1 of the present application. As shown in FIG. 2, the method in this embodiment may include the following steps:
  • Step 101 The base station sends a downlink reference signal (Downlink Reference Signal, DLRS for short), an uplink reference signal (ULRS) indication information, and a high frequency resource used by the base station to allocate the terminal device to the terminal device.
  • DLRS Downlink Reference Signal
  • ULRS uplink reference signal
  • the DLRS, the trigger information of the ULRS, and the information used to indicate the high frequency resource allocated by the base station to the terminal device may be through a physical downlink control channel (PDCCH) or a physical downlink broadcast channel (physical downlink broadcast channel).
  • PDCCH physical downlink control channel
  • PDBCH physical downlink broadcast channel
  • the indication information of the ULRS and the information about the high frequency resource used by the base station to be allocated to the terminal device may be sent to the terminal device through the same downlink control information (DCI), or may pass different DCIs respectively.
  • DCI downlink control information
  • the base station indicates the indication information of the uplink reference signal ULRS by using the first DCI, and indicates the high frequency resource allocated by the base station to the terminal device by using the second DCI.
  • the base station and the terminal device determine the transmit beam and the receive beam required for transmission in the high frequency band through the low frequency band, and this stage may be referred to as beam training.
  • the low frequency band may be a dedicated component carrier or a subband of the component carrier.
  • the definition of the subband can refer to the definition of the 3GPP standard, and details are not described herein again.
  • FIG. 3 is a schematic diagram of a low frequency band. As shown in FIG. 3, the low frequency band is added to a common component carrier operating in an existing communication system, and a dedicated component carrier is newly added. The dedicated component carrier is only used for auxiliary high. Beam training in the frequency band.
  • 4 is another schematic diagram of a low frequency band, as shown in FIG. 4, which is a subband of a common component carrier in which an existing communication system operates.
  • the frequency division multiplexing may be used for uplink and downlink data transmission, or time division multiplexing (Time Division Duplex). , referred to as TDD), for the transmission of uplink and downlink data.
  • TDD time division multiplexing
  • the data transmitted in the low frequency band may adopt the format shown in FIG. 5, and FIG. 5 is a schematic structural diagram of a Transmission Time Unit (TTU) on the low frequency band.
  • TTI Transmission Time Interval
  • TTI refers to the length of an independent decoded transmission in a wireless link.
  • 1TTI is generally considered to be equal to 1 ms. That is, the size of a Subframe (subframe equals 2slot), which is the basic unit of time governed by radio resource management.
  • the TTI may be equal to 1 slot or mini-slot.
  • the TTI or the TTU identifies the minimum transmission unit.
  • the following TTI and TTU are collectively called For the TTU.
  • the low frequency TTU includes at least 5 OFDM symbols, and the low frequency TTU refers to the TTU transmitted on the low frequency band.
  • at least one OFDM symbol is used to transmit a DLRS, for example, the first OFDM symbol of the low frequency TTU is used to transmit the DLRS.
  • the DLRSs are inserted at equal intervals in the frequency domain at corresponding resource elements (Resource Element, RE for short) of the OFDM symbol.
  • 6 is a schematic diagram of transmission of DLRS. As shown in FIG.
  • the first OFDM symbol of the low frequency TTU is used to transmit DLRS, and one for every three subcarriers.
  • DLRS Downlink Reference Signal
  • the base station can transmit the DLRS by using the transmission mode shown in FIG. 6.
  • the remaining REs may be used to transmit broadcast information on the high frequency band and a Physical Downlink Control Channel (PDCCH). information.
  • PDCH Physical Downlink Control Channel
  • the base station is a terminal device.
  • the information of the allocated high frequency resources can be indicated by the DCI.
  • the OFDM symbol transmitting the PDCCH may be an OFDM symbol immediately following the OFDM symbol in which the DLRS is transmitted.
  • At least one OFDM symbol is used for a guard interval (GP) for uplink transmission and downlink transmission, and the GP is used for a handover operation of a base station for downlink transmission to uplink transmission.
  • GP guard interval
  • At least one OFDM symbol is used to transmit a Physical Uplink Control Channel (PUCCH) information
  • PUCCH information may specifically be an ACK/NACK of data transmitted on a high frequency band ( Acknowledge, Non-Acknowledge information, Channel Quality Information (CQI) and Channel State Information (CSI).
  • PUCCH Physical Uplink Control Channel
  • CQI Channel Quality Information
  • CSI Channel State Information
  • a low frequency TTU at least one OFDM symbol is used to transmit an Uplink Reference Signal (ULRS).
  • ULRS Uplink Reference Signal
  • the last OFDM symbol of the TTU can be used as a transmission ULRS.
  • the resources of the resource block (Resource Block, RB for short) inserted by the terminal device are configured by the base station and notified to the terminal device by corresponding signaling.
  • the terminal device inserts the ULRS at equal intervals at a certain density on the RBs configured by the base station.
  • FIG. 7 is a schematic diagram of transmission of a ULRS. As shown in FIG. 7, the last OFDM of the low frequency TTU is used to transmit the ULRS, and one ULRS is inserted every 2 subcarriers.
  • the ULRS is transmitted in a low-frequency TTU is configured and triggered by the base station. Only when the ULRS transmission is configured and triggered in the low-frequency TTU, the corresponding OFDM symbol is used for ULRS transmission, otherwise the OFDM symbol transmits PUCCH. .
  • Step 102 The terminal device sends the ULRS to the base station by using the low frequency band according to the indication information of the ULRS.
  • the transmission indication information of the ULRS is used to indicate whether the terminal device transmits the URLS.
  • the transmission indication information may be represented by one bit. For example, when the bit position is 1, it indicates that the terminal device should transmit the ULRS, and when the bit position is 0, it indicates that the terminal device does not need to transmit the ULRS.
  • the DCI in which the indication information of the ULRS is located may further include information of a time-frequency resource for transmitting the ULRS, and the information of the time-frequency resource for transmitting the ULRS may be an index of the RB that sends the ULRS, and the time-frequency resource of the ULRS may pass.
  • the method of code division multiplexing is multiplexed by a plurality of terminal devices. In this embodiment, the terminal device can transmit the ULRS by using the transmission mode shown in FIG. 7.
  • Step 103 The terminal device determines, according to the DLRS, a receive beam used for receiving downlink data in a high frequency band.
  • the DLRS has two functions.
  • the first function is a demodulation reference signal for downlink transmission.
  • the terminal device performs channel estimation on the DLRS, and demodulates the downlink data according to the result of the channel estimation.
  • the second function is used by the terminal device to estimate the Angle of Arrival (AoA:).
  • the terminal device can estimate the low frequency band according to the received DLRS by using a certain algorithm (for example, MUSIC algorithm, ESPRIT algorithm).
  • the AoA of the transmitted low-frequency signal utilizes the reciprocity between the transmitting and receiving antennas, and the terminal device acquires the receiving beam used for receiving the downlink data in the high-frequency band according to the AoA.
  • Step 104 The base station determines, according to the ULRS, a transmit beam used for transmitting downlink data on a high frequency band.
  • the ULRS transmitted by the terminal device is used by the base station to perform AoA estimation.
  • the base station may use a certain algorithm (for example, MUSIC algorithm, ESPRIT algorithm) to estimate the AoA of the low frequency signal in the low frequency band according to the received ULRS, and use the mutual communication between the transmitting and receiving antennas.
  • the base station can determine the transmit beam on the high frequency band based on the estimated AoA on the low frequency band.
  • Step 105 The base station sends the downlink data to the terminal device in the high frequency band by using the high frequency resource and the transmission beam allocated to the terminal device.
  • the information of the high frequency resource allocated by the base station to the terminal device includes information for indicating a high frequency TTU identifier and/or information for indicating a high frequency TTU allocation.
  • a TTU_ID field may be defined in the DCI, where the TTU_ID field is used to indicate which of the N high-frequency TTUs indicated by the DCI is allocated, for example, a 3-bit TTU_ID field is defined, and a maximum of 8 highs may be indicated.
  • the frequency TTU, 000-111 identifies eight high frequency TTUs, respectively. Therefore, in the first case, the DCI includes information indicating the high frequency TTU identification.
  • a TTU allocation (TTU_ALLOCATION) field may be defined in the DCI, where the TTU_ALLOCATION is used to indicate which DCIs are allocated resource allocations, for example, an 8-bit TTU_ALLOCATION field is defined by a bitmap. It can support up to 8 high frequency TTU joint scheduling. For example, 11001100 identifies a base station to allocate a time-frequency resource to a terminal on the 1st, 2nd, 4th, and 5th high-frequency TTUs; 10101010 identifies a base station to a terminal device in the first, third, fifth, and Time-frequency resources are allocated on seven high-frequency TTUs. Therefore, in the second case, the DCI includes information indicating the allocation of the high frequency TTU.
  • the length of one low frequency TTU is N times the length of one high frequency TTU, where N is an integer greater than one.
  • the terminal device and the base station can perform corresponding AoA estimation according to the DLRS and the ULRS, respectively, thereby determining the transmit beam and the receive beam used for data transmission in the high-frequency band.
  • the base station triggers transmission of the ULRS of the terminal device in the low frequency TTU on the PDCCH of the kth low frequency TTU.
  • the base station performs downlink data transmission on the N high frequency TTUs in the k+m low frequency TTUs scheduled by the terminal device, and the terminal equipment feeds back the ACK corresponding to the downlink data on the PUCCH in the k+m+l low frequency TTUs.
  • NACK message where l (greater than or equal to 1) low frequency TTUs are used as delays for data reception and processing in the high frequency band.
  • Step 106 The terminal device sends a feedback message of the downlink data to the base station.
  • the feedback message of the downlink data includes an ACK and a NACK message
  • the terminal device can send a feedback message of the downlink data to the base station by using the low frequency band, and the terminal device can also send the feedback message of the downlink data to the base station by using the high frequency band.
  • the terminal device can determine the TTU used by the feedback message for transmitting the downlink data according to the timing relationship between the high frequency TTU and the low frequency TTU.
  • the base station sends the indication information of the DLRS and the ULRS to the terminal device through the low frequency band, and the information about the high frequency resource allocated by the base station to the terminal device, so that the terminal device sends the ULRS through the low frequency band according to the indication information of the ULRS, and the base station according to the ULRS.
  • Determining the transmit beam used for transmitting downlink data in the high frequency band, and the terminal device also determines the receive beam used for receiving the downlink data in the high frequency band according to the DLRS, and the base station uses The high frequency resource and the transmission beam allocated to the terminal device transmit downlink data to the terminal device.
  • the method performs beam training through a low frequency band auxiliary high frequency band to realize high frequency data transmission.
  • Embodiment 1 The technical solutions of the method embodiment shown in Embodiment 1 are described in detail below by using several specific embodiments.
  • FIG. 9 is a flowchart of a communication method according to Embodiment 2 of the present application. As shown in FIG. 9, the method in this embodiment may include the following steps:
  • Step 201 The base station sends the DLRS and the DCI to the terminal device by using the low frequency band, where the DCI includes the indication information of the ULRS and the high frequency resource allocated by the base station to the terminal device.
  • a DCI corresponds to resource allocation of a terminal device on a high frequency TTU.
  • the base station needs to send multiple DCIs to the terminal device. Based on the first case, the base station can allocate different frequency domain resources for the terminal equipment on different high frequency TTUs.
  • one DCI corresponds to resource allocation of a terminal device on multiple high frequency TTUs. If the terminal device is scheduled to multiple high frequency TTUs, the frequency domain resources allocated on these high frequency TTUs are the same.
  • a TTU_ID field may be defined in the DCI, where the TTU_ID field is used to indicate which of the N high-frequency TTUs indicated by the DCI is allocated, for example, a 3-bit TTU_ID field is defined, Indicates up to 8 high frequency TTUs, 000-111 respectively identifying 8 high frequency TTUs. Therefore, in the first case, the DCI includes information indicating the high frequency TTU identification.
  • a TTU allocation (TTU_ALLOCATION) field may be defined in the DCI, and the TTU_ALLOCATION is used to indicate which DCIs are indicated on the high frequency TTU, for example, an 8-bit TTU_ALLOCATION field is defined by bit mapping. (bitmap), can support up to 8 high-frequency TTU joint scheduling. For example, 11001100 identifies a base station to allocate a time-frequency resource to a terminal on the 1st, 2nd, 4th, and 5th high-frequency TTUs; 10101010 identifies a base station to a terminal device in the first, third, fifth, and Time-frequency resources are allocated on seven high-frequency TTUs. Therefore, in the second case, the DCI includes information indicating the allocation of the high frequency TTU.
  • the indication information of the ULRS and the information of the high frequency resource allocated by the base station to the terminal device are carried in a DCI, so that the beam training process and the data scheduling process are performed simultaneously, and beam training is required for each data scheduling.
  • Step 202 The terminal device sends the ULRS to the base station by using the low frequency band according to the indication information of the ULRS.
  • the terminal device After receiving the ULRS indication information in the DCI, the terminal device transmits the ULRS on the corresponding low frequency TTU.
  • the terminal device may transmit the ULRS in the low frequency TTU in which the base station transmits the indication information of the ULRS, or may delay the transmission of the ULRS by several low frequency TTUs after the base station transmits the low frequency TTU of the indication information of the ULRS.
  • the number of the low-frequency TTUs that are delayed by the terminal device may be set by the base station, or may be configured by the base station, and then sent to the terminal device by using signaling.
  • Step 203 The terminal device determines, according to the DLRS, a receive beam used for receiving downlink data in a high frequency band.
  • Step 204 The base station determines, according to the ULRS, a transmit beam used for transmitting downlink data on a high frequency band.
  • the high frequency transmitting and receiving antenna and the low frequency transmitting and receiving antenna have reciprocity, and the receiving beam and the transmitting beam in the high frequency band and the low frequency band are consistent, and the transmitting beam and the high frequency band are transmitted in the low frequency band.
  • the beams are consistent.
  • Step 205 The base station sends the downlink data to the terminal device in the high frequency band by using the high frequency resource and the transmission beam allocated to the terminal.
  • the terminal device receives the downlink data sent by the base station in the high frequency band by using the receiving beam determined in step 203, and determines the feedback message according to the receiving result of the downlink data. If the downlink data is successfully received, the feedback message is an ACK message, and if the downlink data reception fails, the feedback message is a NACK message.
  • Step 206 The terminal device sends a feedback message of the downlink data to the base station.
  • step 206 For a specific implementation of the step 206, refer to the related description of the first embodiment, and details are not described herein again.
  • the base station sends the DLRS and the DCI to the terminal device by using the low frequency band
  • the DCI is used to indicate the indication information of the ULRS and the high frequency resource indication information allocated by the base station to the terminal device
  • the base station determines the high frequency according to the URLS sent by the terminal device.
  • the transmitting beam used for transmitting the downlink data in the frequency band, and the terminal device also determines the receiving beam used for receiving the downlink data in the high frequency band according to the DLRS, thereby completing the beam training process, and after the beam training ends, the base station uses the trained transmitting beam and
  • the high frequency resource allocated to the terminal device sends downlink data to the terminal device, and the terminal device receives the downlink data by using the received receive beam.
  • the method performs beam training through a low frequency band auxiliary high frequency band to realize high frequency data transmission.
  • FIG. 10 is an interaction diagram of a communication method according to Embodiment 3 of the present application. As shown in FIG. 10, the method in this embodiment may include the following steps:
  • Step 301 The base station sends the DLRS and the first DCI to the terminal device by using the low frequency band, where the first DCI includes indication information of the ULRS.
  • the first DCI may include indication information of a ULRS of a terminal device, that is, the first DCI indicates that one terminal device sends a ULRS, and the first DCI may also include a group-specific ULRS indication information. That is, the first DCI indicates that a plurality of terminal devices in one terminal device group transmit the ULRS.
  • Step 302 The terminal device sends the ULRS to the base station by using the low frequency band according to the indication information of the ULRS.
  • Step 303 The terminal device determines, according to the DLRS, a receive beam used for receiving downlink data in a high frequency band.
  • Step 304 The base station determines, according to the ULRS, a transmit beam used for transmitting downlink data on a high frequency band.
  • Step 305 The base station sends a second DCI to the terminal device by using the low frequency resource, where the second DCI is used to indicate the high frequency resource allocated by the base station to the terminal device.
  • a second DCI may correspond to resource allocation of a terminal device on a high frequency TTU.
  • a second DCI may also correspond to one terminal device.
  • Resource allocation on a high frequency TTU when a second DCI can correspond to resource allocation of a terminal device on a high frequency TTU, the second DCI includes information for indicating a high frequency TTU identifier.
  • the second DCI when a second DCI can also correspond to resource allocation of a terminal device on a plurality of high frequency TTUs, the second DCI includes information for indicating high frequency TTU allocation.
  • step 201 of the second embodiment For the specific implementation manner of this step, refer to step 201 of the second embodiment. Related descriptions are not described here.
  • the base station separately indicates the beam training process and the data scheduling process by using the indication information of the ULRS and the information of the high frequency resource allocated by the base station to the terminal device through different DCI indications. In this way, through one beam training, multiple data scheduling can be performed, which makes data scheduling more flexible and can reduce the overhead of beam training.
  • Step 306 The base station sends the downlink data to the terminal device in the high frequency band by using the high frequency resource and the transmission beam allocated to the terminal device.
  • the terminal device receives the downlink data sent by the base station on the high frequency band by using the receive beam determined in step 303. And determining a feedback message according to the receiving result of the downlink data.
  • Step 307 The terminal device sends a feedback message of the downlink data to the base station.
  • the base station sends the DLRS, the first DCI, and the second DCI to the terminal device by using a dedicated low frequency band, where the first DCI includes indication information of the ULRS, and the second DCI is used to indicate the high frequency resource allocated by the base station to the terminal device.
  • the information is such that the terminal device transmits the ULRS through the low frequency band according to the indication information of the ULRS, and the base station determines, according to the ULRS, the transmission beam used for transmitting the downlink data on the high frequency band, and the terminal device also determines, according to the DLRS, the downlink data used for receiving the downlink data according to the DLRS.
  • the beam is received to complete the beam training.
  • the base station sends the downlink data to the terminal device by using the trained transmit beam and the high frequency resource allocated for the terminal device.
  • the method performs beam training through a low frequency band auxiliary high frequency band to realize high frequency data transmission.
  • FIG. 11 is an interaction diagram of a communication method according to Embodiment 4 of the present application. As shown in FIG. 11, the method in this embodiment may include the following steps:
  • Step 401 The terminal device reports capability indication information to the base station.
  • the capability indication information includes the number of pieces of the receiving beam of the terminal device on the high frequency band and/or the number of pieces of the radio frequency link of the terminal device in the high frequency band.
  • Step 402 The base station sends the DLRS and the first DCI to the terminal device by using the low frequency band, where the first DCI includes indication information of the ULRS.
  • the first DCI includes indication information of a ULRS of a terminal device, and may also include indication information of a ULRS of a terminal device group.
  • Step 403 The terminal device sends the ULRS to the base station by using the low frequency band according to the indication information of the ULRS.
  • Step 404 The terminal device determines a receiving direction angle in the low frequency band according to the DLRS.
  • Step 405 The base station determines a transmission direction angle in the low frequency band according to the ULRS.
  • Step 406 The base station sends a third DCI to the terminal device by using the low frequency band.
  • the third DCI includes one or more of the following information: the high frequency resource information of the Beam Tracking Reference Signal (BTRS), the number of base station radio frequency links, or the number of beam numbers.
  • the high frequency resource information included in the third DCI is used to notify the terminal device base station to send the high frequency resource used by the BTRS, and the number of the radio link information is used to notify the terminal device base station to send the number of the radio link used by the BTRS, and the beam.
  • the number information is used to notify the terminal device base station of the number of transmit beams used by the BTRS.
  • the base station determines to send the BTRS according to the capability indication information reported by the terminal device.
  • High frequency resources used For example, suppose the number of base station beams is 8, and the number of radio link is 1, and training a pair of beams requires resources of 1 OFDM symbol. If the number of receive beams reported by the terminal device is 4 and the number of radio link is 1, the BTRS needs to be sent to perform beam training using 32 OFDM symbols. If the number of receive beams reported by the terminal device is 4, the number of radio links is To be 2, the BTRS needs to be transmitted using 16 OFDM symbols for beam training.
  • Step 407 The base station sends the BTRS to the terminal device according to the transmission direction angle of the low frequency band and the high frequency resource indicated in the third DCI.
  • the base station may determine, according to a transmission direction angle of the low frequency band, a transmit beam used by the BTRS, where the number of transmit beams determined by the base station is the same as the number of beams included in the third DCI. Assuming that the number of transmit beams is four, the base station can select four transmit beams around the transmit direction angle of the low frequency band for transmitting the BTRS with the transmission direction angle of the low frequency band as the center point.
  • the terminal device receives the BTRS sent by the base station according to the receiving direction angle of the third DCI and the low frequency band, and the terminal device can select multiple receiving beam receiving around the receiving direction angle of the low frequency band with the receiving direction angle of the low frequency band as a center point.
  • the number of receiving beams that receive the BTRS determined by the terminal device is the same as the number of receiving beams in the capability indication information reported to the base station.
  • the BTRS sent by the base station is received according to the high frequency resource, the number of radio link, and the number of transmit beams used by the base station to transmit the BTRS.
  • Step 408 The terminal device determines, according to the BTRS, a transmit beam used by the base station to send downlink data on the high frequency band and a receive beam used by the terminal device to receive downlink data in the high frequency band.
  • the terminal device receives 16 BTRSs, and the terminal device can select the strongest received signal strength from the received 16 BTRSs.
  • the transmit beam corresponding to the strongest BTRS of the received signal is a transmit beam used by the base station to transmit downlink data in the high frequency band
  • the receive beam corresponding to the strongest received BTRS is the terminal device receiving the downlink on the high frequency band. The receive beam used by the data.
  • Step 409 The terminal device sends the information of the transmit beam to the base station by using a low frequency band.
  • the information of the transmit beam includes identification information of the transmit beam, such as a beam ID.
  • Step 410 The base station sends a second DCI to the terminal device by using the low frequency resource, where the second DCI is used to indicate the high frequency resource allocated by the base station to the terminal device.
  • Step 411 The base station sends the downlink data to the terminal device in the high frequency band by using the high frequency resource and the transmission beam allocated to the terminal device.
  • the base station sends the downlink data to the terminal device by using the transmit beam determined in step 408. Accordingly, the terminal device receives the downlink data sent by the base station by using the receive beam determined in step 408.
  • Step 412 The terminal device sends a feedback message of the downlink data to the base station.
  • the base station receives the capability indication information reported by the terminal device in the low frequency band, sends the third DCI to the terminal device according to the capability indication information to trigger the beam tracking process, and sends the BTRS to the terminal device through the high frequency band, and the terminal device And determining, according to the received BTRS, a transmit beam used by the base station to send downlink data on the high frequency band, and a receive beam used by the terminal device to receive downlink data in the high frequency band, and send the transmit beam information to the base station by using the low frequency band.
  • the determined transmit and receive beams on the obtained high frequency band are more accurate.
  • FIG. 12 is a schematic structural diagram of a base station according to Embodiment 5 of the present application. As shown in FIG. 12, the base station provided in this embodiment includes: a sending module 11, a receiving module 12, and a processing module 13.
  • the sending module 11 is configured to send, by using a low frequency band, a downlink reference signal DLRS and a first downlink control information DCI, where the first DCI includes indication information of an uplink reference signal ULRS;
  • the receiving module 12 is configured to receive a ULRS that is sent by the terminal device by using the low frequency band;
  • the processing module 13 is configured to determine, according to the ULRS, a transmit beam used for transmitting downlink data on a high frequency band;
  • the sending module 11 is further configured to send downlink data to the terminal device on the high frequency band by using the sending beam.
  • the low frequency band is a dedicated component carrier or a subband of the component carrier.
  • the sending module 11 is further configured to: send the second DCI to the terminal device by using the low frequency resource, where the second DCI is used to indicate the high frequency resource allocated by the base station to the terminal device.
  • the second DCI includes information for indicating a high frequency transmission time unit TTU identifier.
  • the second DCI includes information indicating a high frequency transmission time unit TTU allocation.
  • the processing module 13 is configured to: obtain an arrival angle AoA according to the ULRS, and then obtain, according to the AoA, the transmit beam used for sending downlink data.
  • the receiving module 12 is further configured to: receive capability indication information that is reported by the terminal device, where the capability indication information includes information about a number of receive beams of the terminal device on the high frequency band, and/or Or the number information of the radio frequency link of the terminal device in the high frequency band.
  • the sending module 11 is further configured to: send, by using the low frequency resource, a third DCI to the terminal device, where the third DCI includes one or more of the following information: the high frequency resource that the base station sends the beam tracking signal BTRS Information, number of base station RF links, or number of beams.
  • the processing module is specifically configured to: send, by the sending module, the BTRS to the terminal device by using the high frequency resource indicated by the third DCI. Receiving, by the receiving module, the transmit beam used by the base station to send downlink data on the high frequency band sent by the terminal device in the low frequency band.
  • the base station in this embodiment may be used to perform the steps performed by the base station in the foregoing Embodiments 1 to 4, and the specific implementation manners and technical effects are similar, and details are not described herein again.
  • FIG. 13 is a schematic structural diagram of a terminal device according to Embodiment 6 of the present application.
  • the terminal device provided in this embodiment includes: a sending module 21, a receiving module 22, and a processing module 23.
  • the receiving module 22 is configured to receive, by using a low frequency band, a downlink reference signal DLRS and a first downlink control information DCI, where the first DCI includes indication information of an uplink reference signal ULRS;
  • the sending module 21 is configured to send, according to the indication information of the ULRS, a ULRS to the base station by using the low frequency band;
  • the processing module 23 is configured to determine, according to the DLRS, a receive beam used for receiving downlink data on a high frequency band;
  • the receiving module 22 is further configured to receive, by using the receiving beam, the base station to send on the high frequency band Downstream data.
  • the low frequency band is a dedicated component carrier or a subband of the component carrier.
  • the receiving module 22 is further configured to: receive the second DCI sent by the base station by using the low frequency resource, where the second DCI is used to indicate the high frequency resource allocated by the base station to the terminal device.
  • the second DCI includes information for indicating a high frequency transmission time unit TTU identifier.
  • the second DCI includes information indicating a high frequency transmission time unit TTU allocation.
  • the processing module 23 is configured to: obtain an angle AoA according to the DLRS, and then obtain, according to the AoA, the received beam used for receiving downlink data.
  • the sending module 21 is further configured to: report the capability indication information to the base station, where the capability indication information includes the number information and/or location of the receiving beam of the terminal device on the high frequency band. The number information of the radio frequency link of the terminal device in the high frequency band.
  • the receiving module 22 is further configured to: receive, by using the low frequency resource, a third DCI sent by the base station, where the third DCI includes one or more of the following information: the high frequency resource that the base station sends the beam tracking signal BTRS The information, the number of base station radio frequency links or the number of beams, and the high frequency resource indicated by the third DCI are used to receive the BTRS sent by the terminal device.
  • the processing module 23 is specifically configured to: determine, according to the BTRS, a transmit beam used by the base station to send downlink data in the high frequency band, and a receive beam used by the terminal device to receive downlink data in the high frequency band .
  • the sending module 21 is further configured to: send information about the transmit beam to the base station by using the low frequency band.
  • the terminal device in this embodiment may be used to perform the steps performed by the terminal device in the foregoing Embodiments 1 to 4, and the specific implementation manners and technical effects are similar, and details are not described herein again.
  • FIG. 14 is a schematic block diagram of a base station according to Embodiment 7 of the present application.
  • the base station 1300 includes a processor 1310, a memory 1320, a transceiver 1330, an antenna 1340, a bus 1350, and a user interface 1360.
  • processor 1310 controls the operation of network element 1300, which may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array, or other programmable logic device.
  • Transceiver 1330 includes a transmitter 1332 for transmitting signals and a receiver 1334 for receiving signals.
  • the number of antennas 1340 may be one or more.
  • the network element 1300 can also include a user interface 1360, such as a keyboard, microphone, speaker, and/or touch screen. User interface 1360 can communicate content and control operations to base station 1300.
  • bus 1350 which in addition to the data bus includes a power bus, a control bus, and a status signal bus.
  • various buses are labeled as bus system 1350 in the figure. It should be noted that the foregoing description of the structure of the base station can be applied to the embodiments of the present application.
  • the memory 1320 may include a Read Only Memory (ROM) and a Random Access Memory (RAM), or other types of dynamic storage devices that can store information and instructions, or may be a disk storage.
  • the memory 1320 can be used to save instructions that implement the related methods provided by the embodiments of the present application. It will be appreciated that at least one of the cache and long term storage is programmed or loaded by the processor 1310 to the network element 1300.
  • the base station 1300 in this embodiment may perform the corresponding steps performed by the base station in the first embodiment to the fourth embodiment.
  • the application examples will not be described again.
  • FIG. 15 is a schematic block diagram of a terminal device according to Embodiment 8 of the present application.
  • the terminal device 1400 includes a processor 1410, a memory 1420, a transceiver 1430, an antenna 1440, a bus 1450, and a user interface 1460.
  • processor 1410 controls the operation of network element 1400, which may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array, or other programmable logic device.
  • Transceiver 1430 includes a transmitter 1432 for transmitting signals and a receiver 1434 for receiving signals.
  • the number of antennas 1440 may be one or more.
  • Terminal device 1400 can also include a user interface 1460, such as a keyboard, microphone, speaker, and/or touch screen. User interface 1460 can communicate content and control operations to terminal device 1400.
  • bus 1450 which in addition to the data bus includes a power bus, a control bus, and a status signal bus.
  • various buses are labeled as bus system 1450 in the figure. It should be noted that the foregoing description of the structure of the terminal device can be applied to the embodiments of the present application.
  • the memory 1420 may include a Read Only Memory (ROM) and a Random Access Memory (RAM), or other types of dynamic storage devices that can store information and instructions, or may be a disk storage.
  • the memory 1420 can be used to save instructions that implement the related methods provided by the embodiments of the present application. It will be appreciated that at least one of the cache and long term storage is programmed or loaded by the processor 1410 of the terminal device 1400 by programming or loading executable instructions.
  • the terminal device 1400 of this embodiment may perform the corresponding steps performed by the terminal device in the first embodiment to the fourth embodiment, and details are not described herein again.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

La présente invention concerne un procédé de communication, une station de base et un dispositif terminal, le procédé comprenant les étapes consistant : à transmettre, par une station de base, un signal de référence de liaison descendante (DLRS) et des premières informations de commande de liaison descendante (DCI) à un dispositif terminal au moyen d'une bande basse fréquence, les premières DCI comprenant des informations d'indication d'un signal de référence de liaison montante (ULRS), et le DLRS étant utilisé par le dispositif terminal pour déterminer un faisceau de réception utilisé dans la réception de données de liaison descendante sur une bande haute fréquence ; à transmettre, par le dispositif terminal, l'ULRS au moyen de la bande basse fréquence en fonction des informations d'indication de l'ULRS ; à déterminer, par la station de base, le faisceau de transmission utilisé dans la transmission de données de liaison descendante sur la bande haute fréquence en fonction de l'ULRS ; à déterminer, par le dispositif de terminal, un faisceau de réception utilisé dans la réception des données de liaison descendante sur la bande haute fréquence en fonction du DLRS ; et à utiliser, par la station de base, une ressource haute fréquence attribuée au dispositif terminal et au faisceau de transmission pour transmettre des données de liaison descendante au dispositif terminal. Le procédé réalise un apprentissage de faisceau au moyen d'une bande basse fréquence qui aide une bande haute fréquence de façon à transmettre des données haute fréquence.
PCT/CN2017/112838 2016-12-02 2017-11-24 Procédé de communication, station de base et dispositif terminal Ceased WO2018099328A1 (fr)

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