WO2019029498A1 - Procédé et dispositif de communication - Google Patents

Procédé et dispositif de communication Download PDF

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Publication number
WO2019029498A1
WO2019029498A1 PCT/CN2018/099049 CN2018099049W WO2019029498A1 WO 2019029498 A1 WO2019029498 A1 WO 2019029498A1 CN 2018099049 W CN2018099049 W CN 2018099049W WO 2019029498 A1 WO2019029498 A1 WO 2019029498A1
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WIPO (PCT)
Prior art keywords
message
uplink resources
terminal device
uplink
network device
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PCT/CN2018/099049
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English (en)
Chinese (zh)
Inventor
颜矛
黄煌
陈磊
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华为技术有限公司
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Publication of WO2019029498A1 publication Critical patent/WO2019029498A1/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
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • 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
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and apparatus for communication.
  • Beamforming technology is proposed in future wireless communication systems (eg, new air interface). Beamforming technology can limit the energy of the transmitted signal to a certain beam direction, thereby increasing signal reception. effectiveness. Beamforming technology can effectively expand the transmission range of wireless signals and reduce signal interference, thereby achieving higher communication efficiency and higher network capacity. Beamforming technology, while improving the efficiency of communication networks, also poses challenges for beam management.
  • the user equipment needs to complete uplink synchronization before sending uplink service data to the network device.
  • LTE long term evolution
  • a random access procedure initiated by a user equipment completes uplink synchronization, but in a random access procedure of an LTE communication system, a user equipment initiates and retransmits a message 3 (msg3)
  • msg3 message 3
  • the technical problem to be solved by the present application is to provide a communication method and device, which can reduce the probability of collision of the message 3 and reduce the delay of the uplink synchronization.
  • the present application provides a method for communication, including: a network device receiving a message 3 sent by a terminal device, and if the detection message 3 fails to be sent, the network device sends, to the terminal device, K items for indicating that the message 3 is retransmitted.
  • K is an integer greater than 1.
  • the message 3 is the message 3 in the random access process, and the uplink resource includes at least one of a time-frequency resource, an antenna port, and a reference signal.
  • the configuration information can be notified to the terminal device by message 2 and/or system information (SI).
  • the network device when the network device detects that the message 3 fails to be sent, the network device sends, to the terminal device, configuration information of multiple uplink resources used to indicate that the message 3 is retransmitted, so that the terminal device obtains multiple uplink resources. Selecting one or more uplink resources to retransmit at least one message 3 reduces the probability of retransmitting the message 3 with the same uplink resource by other terminal devices, thereby reducing the probability of collision occurrence and reducing the delay of random access.
  • the new radio supports: the network device schedules 1 message 3 for transmission via message 2, and the network device can schedule multiple messages 3 for retransmission to reduce access delay and Reduce the probability of collision.
  • NR supports scheduling multiple Msg3 retransmission to reduce the access delay and the contention probability.
  • the new air interface supports: the network device schedules one uplink grant/uplink resource for the transmission of the message 3 through the message 2, and the network device can schedule multiple uplink grant/uplink resources for the weight of the message 3. Pass to reduce access delay and reduce the probability of collision.
  • the configuration information of the K uplink resources is indicated by one downlink control information (DCI), and one DCI is configured with K uplink resources; or the configuration information of the K uplink resources is configured by K.
  • the DCI indicates that the K DCIs and the K uplink resources have a one-to-one relationship, and each DCI is configured with one uplink resource; or the configuration information of the K uplink resources is indicated by M DCIs, where M is greater than 1
  • M is greater than 1
  • M An integral number
  • each DCI of the M1 DCIs is configured with one uplink resource
  • the sum of the number of uplink resources and the number of uplink resources configured by the M2 DCIs is K.
  • the K DCIs are located in different frequency domain locations and/or time slots, respectively, and the M DCIs are respectively located in different frequency domain locations or time slots.
  • the configuration information includes the uplink resource quantity information and/or the uplink resource location information of the retransmission message 3, and the uplink resource location information of the retransmission message 3 indicates the location information time domain of the K uplink resources. Location and/or frequency domain location; uplink resource quantity information indicates the number K of uplink resources.
  • the method before the network device receives the message 3 sent by the terminal device, the method further includes:
  • the network device sends at least one of a system message, a message 2, and other messages to the terminal device, where the system message or the message 2 carries uplink resource quantity information, and the uplink resource quantity information indicates the The number of K uplink resources.
  • the system message may be a remaining minimum system information (RMSI), and the other message may be a radio resource control (RRC) message, a medium access control-control element (Medium access control-control element) , MAC-CE) message, and physical down control channel order (PDCCH order).
  • RRC radio resource control
  • Medium access control-control element Medium access control-control element
  • MAC-CE physical down control channel order
  • the network device before the network device sends the message 2 to the terminal device, the network device further includes: the network device receiving the random access preamble sent by the terminal, and the network device determining that the type of the random access preamble is a preset type.
  • the random access preambles are divided into different types according to different roles, and different random access preambles correspond to different types.
  • the role of the random access preamble includes a contention-free random access method, beam recovery, beam management, link interruption recovery, and channel state information reference signal (CSI-RS) random access preamble.
  • CSI-RS channel state information reference signal
  • the system message or message 2 carries DCI configuration information indicating at least one of a time domain location, a frequency domain location, and a number of K DCIs or M DCIs.
  • the application provides a method for communication, including: the terminal device sends a message 3 to the network device, and if the message 3 fails to be sent, the terminal device receives the configuration of the K uplink resources from the network device indication message 3 for retransmission.
  • the information, K is an integer greater than 1, the terminal device selects N uplink resources from the K uplink resources, and retransmits the message 3 according to the N uplink resources.
  • the message 3 is the message 3 in the random access process, and in the step of the terminal device sending the message 3 to the network device, the message 3 may be initially transmitted or retransmitted.
  • the terminal device may retransmit N messages 3 according to the N uplink resources, and each uplink resource corresponds to one message 3.
  • Different uplink resources may use different physical layer parameters to transmit Msg3, and the physical layer parameters include at least one of a modulation and coding mode, a redundancy version, a transmission power, a frequency hopping mode, a waveform, and a subcarrier spacing.
  • the terminal device when the terminal device fails to send the message 3, the terminal device selects one or more uplink resources from the multiple uplink resources to retransmit one or more messages 3, and reduces the retransmission of the same uplink resource with other terminal devices.
  • the probability of message 3, thereby reducing the probability of collision occurrence and reducing the delay of random access.
  • the terminal device selects N uplink resources from the K uplink resources, where the terminal device randomly selects N uplink resources from the K uplink resources, or the terminal device associates according to the message 3.
  • the type of the random access preamble determines the number of uplink resources K and/or N; the terminal device selects N uplink resources from the K uplink resources.
  • the number N of downlink resources is notified by the network device to the terminal device.
  • the network device may notify the terminal device by using at least one of message 2, downlink control information, remaining minimum system message, radio resource control message, media access control-control element message, and physical downlink control channel command.
  • the terminal device determines K and/or N associated with the random access preamble according to the type of random access preamble transmitted.
  • the retransmission message 3 uses a different beam than the one used to transmit the message 3.
  • the beamwidth used by the retransmission message 3 is smaller than the beamwidth used by the last transmission message 3 (eg, the retransmission message 3 uses a 3 dB beamwidth), and the beam direction used by the retransmission message 3 is the same as that used for the last transmission of the message 3.
  • the beam directions can overlap in space.
  • the antenna port used by the retransmission message 3 may also be different from the antenna port used for the last transmission of the message 3.
  • the configuration information of the uplink resource is indicated by one downlink control information DCI, and K uplink resources are scheduled; or
  • the configuration information of the uplink resource is indicated by K DCIs, and each DCI is configured with one uplink resource; or
  • the configuration information includes uplink resource location information and uplink resource quantity information, where the uplink resource location information indicates a location of the K uplink resources, and the uplink resource quantity information indicates The number of K uplink resources.
  • the method before the terminal device sends the message 3 to the network device, the method further includes:
  • the terminal device receives at least one of a system message, a message 2, and other messages that are sent by the network device, and the uplink resource quantity information indicates the number of uplink resources of the retransmission message 3.
  • the system message may be an RMSI, and the other message may be at least one of an RRC message, a MAC-CE message, and a PDCCH order.
  • the terminal device sends a random access preamble to the network device, where the type of the random access preamble is a preset type.
  • the terminal device acquires the K uplink resources for retransmission of the message 3 from the K uplink resources according to the type of the random access preamble sent, and/or the K devices from the terminal device.
  • N uplink resources are selected in the uplink resource for retransmission of the message 3.
  • system message or the message 2 further carries DCI configuration information, where the DCI configuration information is used to indicate the time domain location, quantity, and sum of the K DCIs or the M DCIs. At least one of the frequency domain locations.
  • the DCI configuration information is carried in a DCI that has been sent to a terminal device, where the DCI configuration information is used to indicate a time domain location, a quantity, and a quantity of the K DCIs or the M DCIs. At least one of the frequency domain locations.
  • the DCI that has been sent to the terminal device may be other DCIs than K DCIs or M DCIs, or may belong to any one of K DCIs or M DCIs.
  • a communication device having the functionality to implement the behavior of a network device in the above method.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the apparatus includes: a receiving unit and a sending unit.
  • the receiving unit is configured to receive the message 3 sent by the terminal device.
  • a sending unit configured to send, to the terminal device, configuration information of the K uplink resources used to indicate that the message 3 is retransmitted, if the sending of the message 3 fails to be sent, where K is an integer greater than 1.
  • the device includes: a transceiver, a memory, and a processor; wherein
  • a transceiver configured to receive a message 3 sent by the terminal device
  • the program stores a set of program codes
  • the processor is configured to call the program code stored in the memory to perform the following operations:
  • the transceiver is instructed to send, to the terminal device, configuration information of the K uplink resources used to indicate that the message 3 is retransmitted, and K is an integer greater than 1.
  • the device may be a chip, and optionally, the chip may include one or more memories for storing program code, and when the program code is executed, causing the processor to implement a corresponding Features.
  • the principle and the beneficial effects of the device can be referred to the method embodiments of the foregoing possible network devices and the beneficial effects thereof. Therefore, the implementation of the device can refer to the implementation of the method, and the repetition is not Let me repeat.
  • a communication device having the functionality to implement the behavior of a terminal device in the above method.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the apparatus includes: a sending unit, an acquiring unit, and a retransmission unit.
  • a sending unit configured to send a message 3 to the network device
  • An acquiring unit configured to receive configuration information of K uplink resources from the network device, used to indicate that the message 3 is retransmitted, if the message 3 fails to be sent; K is an integer greater than one;
  • a retransmission unit configured to select N uplink resources from the K uplink resources, and retransmit the message 3 according to the N uplink resources; where N ⁇ K, and N is an integer greater than 0.
  • the terminal device includes: a transceiver, a memory, and a processor; wherein
  • a transceiver configured to send a message 3 to the network device
  • the program stores a set of program codes
  • the processor is configured to call the program code stored in the memory to perform the following operations:
  • the terminal device acquires configuration information of the K uplink resources used to indicate that the message 3 is retransmitted; K is an integer greater than one;
  • N ⁇ K, and N is an integer greater than 0.
  • the device may be a chip, and optionally, the chip may include one or more memories for storing program code, and when the program code is executed, causing the processor to implement a corresponding Features.
  • the principle and the beneficial effects of the device can be referred to the method embodiments of the foregoing possible terminal devices and the beneficial effects thereof. Therefore, the implementation of the device can refer to the implementation of the method, and the repetition is not Let me repeat.
  • Yet another aspect of the present application is directed to a computer readable storage medium having instructions stored therein that, when executed on a computer, cause the computer to perform the methods described in the various aspects above.
  • Yet another aspect of the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the methods described in the various aspects above.
  • 1a is a schematic structural diagram of a communication system according to an embodiment of the present invention.
  • 1b is a schematic diagram of a random access procedure in a long term evolution communication system
  • 2a is a schematic diagram of multi-beam communication in a new air interface communication system
  • 2b is another schematic diagram of multi-beam communication in a new air interface communication system
  • FIG. 3 is a schematic flowchart of a method for communication according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a communication apparatus according to an embodiment of the present invention.
  • FIG. 5 is another schematic structural diagram of a communication apparatus according to an embodiment of the present invention.
  • FIG. 6 is another schematic structural diagram of a communication device according to an embodiment of the present invention.
  • FIG. 7 is another schematic structural diagram of a communication apparatus according to an embodiment of the present invention.
  • FIG. 1a is a schematic structural diagram of a communication system according to an embodiment of the present invention.
  • the communication system includes multiple base stations and multiple terminal devices.
  • Figure 1a shows a network device communicating with two terminal devices.
  • the communication system may be a global system for mobile communication (GSM), a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) system, and a global system.
  • GSM global system for mobile communication
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • WiMAX Worldwide interoperability for microwave access
  • LTE long term evolution
  • 5G communication system such as new radio (NR)
  • NR new radio
  • the random access procedure between the terminal device and the network device is as shown in FIG. 1b.
  • S101 The network device sends system information to the terminal device, where the terminal device receives the system information sent by the network device, and the system message can carry parameters such as the maximum number of retransmissions.
  • S102. The terminal device sends a random access preamble (msg1, message 1) to the network device, where the network device receives the random access preamble sent by the terminal device.
  • the terminal device sends a message 3 (msg3) of the first scheduled transmission to the network device, where the network device receives the message 3 of the first scheduled transmission sent by the terminal device; and the time domain location and frequency indicated by the terminal device according to the uplink scheduling authorization.
  • the domain location sends a scheduling transmission message 3 (msg3); if the network device correctly receives the message 3, it sends a message 4 (msg4) to the terminal device for resolving the conflict, and the collision causes multiple users to use the same uplink resource to initiate the random access procedure.
  • the network device considers that only one user initiates random access.
  • S105 The network device sends a scheduling retransmission to the terminal device, and sends a scheduling retransmission through DCI (downlink control information, DCI).
  • DCI downlink control information
  • the network device When the message 3 is transmitted, the network device fails to receive the message 3 due to factors such as channel fading, interference, low transmission power, or multiple user conflicts. When the network device fails to receive the message 3, the resource is scheduled for the message 3 again by using the downlink control information.
  • the network device uses the downlink control information format 0 to schedule resources.
  • the structure of the downlink control information format 0 is as shown in Table 1.
  • the resource block assignment and hopping resource allocation schedules the frequency domain resources retransmitted by the message 3.
  • the maximum number of retransmissions of the message 3 is indicated by the system information. When the number of retransmissions of the message 3 exceeds the maximum number of retransmissions, the terminal device resends the random access preamble or reports the random access problem to the upper layer.
  • the network device assigns a temporary cell-radio network temporary identifier (TC-RNTI) to the terminal device for scrambling of the message 3. If the network device detects that the message 3 is successfully transmitted and the message 4 successfully resolves the conflict, the TC-RNTI is used as the cell-radio network temporary identifier (C-RNTI) of the terminal device.
  • TC-RNTI temporary cell-radio network temporary identifier
  • the network device reconfigures resources and power when the message 3 is retransmitted, and can solve the message 3 transmission failure caused by channel fading or interference, but does not resolve the conflict.
  • the network device notifies the terminal device to retransmit the message 3 all the time, resulting in a large access delay.
  • the network device and the terminal device may use multiple beams for communication, and there is also a problem that the collision probability is large and the access is prolonged.
  • multiple terminal devices use the same random access preamble, and when multiple terminal devices receive a random access response sent by the network device, they all consider that they are granting their own uplink scheduling authorization, so multiple terminals The device sends a message 3 on the same upstream resource, causing a collision.
  • FIG. 2b in a multi-beam scenario, when a random access is initiated, the terminal device uses a wider beam for communication, and a wider beam gains lower antenna gain, and the network device may not receive the message correctly. 3, thus causing the transmission of message 3 to fail.
  • the present application proposes a retransmission method of the message 3: when the network device detects that the message 3 fails to transmit, The terminal device sends a downlink control information to schedule multiple uplink resources, and the terminal device selects one or more uplink resources from the scheduled multiple uplink resources to retransmit one or more messages 3, thereby reducing collision when the message 3 is retransmitted. If the network device detects that the message 3 fails to transmit, the network device sends multiple downlink control information to schedule multiple uplink resources, and the terminal device selects one or more uplink resources from multiple uplink resources to retransmit at least one message.
  • Beam transmits one or more messages 3, sounding reference signal (SRS), channel state information reference signal (ch The annel state information reference signal (CSI-RS) improves the probability of successful message 3 detection.
  • SRS sounding reference signal
  • ch channel state information reference signal
  • CSI-RS annel state information reference signal
  • the terminal device in the present application is a device having a wireless communication function, and may be a handheld device having a wireless communication function, an in-vehicle device, a wearable device, a computing device, or other processing device connected to a wireless modem.
  • Terminal devices in different networks may be called different names, such as: user equipment, access terminals, subscriber units, subscriber stations, mobile stations, mobile stations, remote stations, remote terminals, mobile devices, user terminals, terminals, wireless communications.
  • Device, user agent or user device cellular phone, cordless phone, Session Initiation Protocol (SIP) phone, Wireless Local Loop (WLL) station, Personal Digital Assistant (PDA), Terminal equipment in a 5G network or a future evolution network.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • the network device in the present application may also be referred to as a base station device, and is a device deployed in a radio access network to provide wireless communication functions, including but not limited to: a base station (for example, a BTS (Base Transceiver Station, BTS), a node. B (NodeB, NB), Evolved Node B (eNB or eNodeB), transmission node or transmission reception point (TRP or TP) or next generation Node B (gNB) in the NR system , base stations or network devices in future communication networks), relay stations, access points, in-vehicle devices, wearable devices, wireless-fidelity (Wi-Fi) sites, wireless backhaul nodes, small stations, micro stations and many more.
  • a base station for example, a BTS (Base Transceiver Station, BTS
  • BTS Base Transceiver Station
  • NodeB NodeB
  • eNB or eNodeB Evolved Node B
  • TRP or TP transmission no
  • FIG. 3 is a schematic flowchart diagram of a method for communication according to an embodiment of the present invention, where the method includes but is not limited to the following steps:
  • the terminal device sends a message 3 to the network device, where the network device receives the message 3 sent by the terminal device.
  • the sending of the message 3 in this step may be the initial data or the retransmitted data.
  • the network device sends a system message to the terminal device, where the terminal device sends a random access preamble (msg1) to the network device, the network device receives the random access preamble sent by the terminal device, and the network device sends a random access response to the terminal device. (msg2).
  • the transmission process of the message 1 and the message 2 can be referred to the description in the long-term evolution communication system, and details are not described herein again.
  • the network device detects that the message 3 is sent.
  • the network device may determine the cause of the failure of the message 3 according to the signal quality, and determine the number of multiple uplink resources and/or multiple uplink resources scheduled for retransmission.
  • the signal quality is at least one of a reference signal receiving power (RSRP), a reference signal receiving quality (RSRQ), and a received signal strength indication (RSSI).
  • the reference signal may be a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a phase tracking reference signal (PTRS), and a sounding reference signal. At least one of a sounding reference signal (SRS).
  • the network device detects the signal quality of the reference signal in the message 3, the signal quality meets the preset condition (for example, the signal quality exceeds the preset threshold), and when the message 3 fails to detect, the network device determines that the message 3 fails to be sent, and the message 3 is sent due to the occurrence. Collision (ie, multiple terminal devices simultaneously send a message 3 on the same uplink resource). Optionally, the network device determines that multiple terminal devices collide, and determines a quantity of multiple uplink resources and/or multiple uplink resources that are scheduled for retransmission.
  • the preset condition for example, the signal quality exceeds the preset threshold
  • the network device presets the number of multiple uplink resources and/or uplink resources for retransmission after the message 3 fails to be transmitted according to the type of the random access preamble. For example, when the type of the random access preamble received by the network device is a preset type, after the message 3 fails to be transmitted, multiple uplink resources are scheduled for retransmission and retransmission of the message 3. For another example, when the type of the random access preamble received by the network device does not belong to the preset type, after the message 3 fails to be transmitted, only one uplink resource is scheduled for retransmission of the message 3.
  • the preset type of the contention-free random access mode, the beam recovery, the beam management, the link interruption recovery, and the random access preamble of the channel state information reference signal pre-defines the mapping between the index and the type of the random access preamble.
  • the different random access preambles correspond to different types, and the network device queries the corresponding type according to the received index of the random access preamble.
  • the network device sends, to the terminal device, configuration information of the K uplink resources, where the message 3 is retransmitted, and the terminal device receives the configuration information sent by the network device.
  • the configuration information is used to indicate information of K uplink resources scheduled to the message 3, for example, at least one of a time domain location, a frequency domain location, and a quantity of the K uplink resources.
  • K uplink resources are used to retransmit message 3, and K is an integer greater than one.
  • the uplink resource includes at least one of a time domain resource, a frequency domain resource, and a spatial resource of the service data of the message 3, and includes a reference signal resource of the message 3, and a reference signal. It may be any one of SRS, PTRS, DMRS, and CSI-RS. It should be noted that the K uplink resources may be in the same slot or in different time slots.
  • the configuration information of the K uplink resources is indicated by one DCI, and one DCI is configured with K uplink resources, that is, the network device sends the K uplink resources indicating that the message 3 is retransmitted to the terminal device. DCI.
  • the network device may notify the configuration information of one DCI in this embodiment in the system message, the message 2, or other DCI, where the configuration information includes at least one of the number of DCIs, the time domain location, and the frequency domain location.
  • the configuration information of the K uplink resources is indicated by K DCIs, and each DCI is configured with one uplink resource.
  • K 3
  • the network device sends three DCIs to the terminal device, namely DCI1, DCI2, and DCI3, and the uplink resources scheduled by the three DCIs are uplink resource 1, uplink resource 2, and uplink resource 3.
  • DCI1 indicates the time-frequency position of the uplink resource 1
  • DCI2 indicates the time-frequency position of the uplink resource 2
  • DCI3 indicates the time-frequency position of the uplink resource 3.
  • the network device may notify the configuration information of the K DCIs in the embodiment in the DCI that has been sent to the terminal device in the system message, the message 2, or the K DCIs, where the configuration information includes the number of K DCIs, the time domain location, and the frequency. At least one of the domain locations.
  • the K DCIs may be located in different frequency domain locations and/or time slots.
  • the K DCIs may be located in the same frequency domain location and/or time slot, and sent through different base station beams or antenna ports.
  • the configuration information of the K uplink resources is indicated by M DCIs, and M is an integer greater than 1.
  • M is an integer greater than 1.
  • Each DCI of the M1 DCIs is configured with one uplink resource, and each of the M2 DCIs.
  • the sum of the number of uplink resources configured by M1 DCIs and the number of uplink resources configured by M2 DCIs is equal to K.
  • the network device may notify the configuration information of the M DCIs in the embodiment in the DCI that has been sent to the terminal device in the system message, the message 2, or the M DCI, where the configuration information includes the number of the M DCIs, the time domain location, and At least one of the frequency domain locations.
  • the M DCIs may be located in different frequency domain locations and/or time slots.
  • the M DCIs may be located in the same frequency domain location and/or time slot, and sent through different base station beams or antenna ports.
  • the network device sends, to the terminal device, M DCIs for indicating that the message 3 is retransmitted.
  • Some DCIs of the M DCIs are configured with one uplink resource, and DCIs of another part of the M DCIs are configured with multiple uplink resources.
  • One uplink resource, three DCIs are divided into DCI1, DCI2 and DCI3.
  • DCI1 is configured with uplink resource 1
  • DCI2 is configured with uplink resource 2
  • DCI3 is configured with uplink resource 3 and uplink resource 4.
  • the configuration information of the K uplink resources may further indicate physical layer parameters on each uplink resource, where the physical layer parameters include at least one of a sending power, a modulation mode, an encoding mode, and a redundancy version.
  • the physical layer parameters used by different uplink resources may be the same or different.
  • the configuration information of the K uplink resources may further indicate a manner of sending the message 3 on each uplink resource, where the sending manner includes: switching a beam, changing a precoding manner, and changing a demodulation reference signal (demodulation reference) At least one of signal, DMRS), waveform, and subcarrier spacing.
  • the sending manner includes: switching a beam, changing a precoding manner, and changing a demodulation reference signal (demodulation reference) At least one of signal, DMRS), waveform, and subcarrier spacing.
  • the system message sent by the network device to the terminal device carries the resource quantity indication identifier, where the resource quantity indication identifier is used to indicate that the number of uplink resources scheduled to be retransmitted to the message 3 is one or more.
  • the resource quantity indication identifier is represented by 0 and 1, and 0 indicates that the number of uplink resources scheduled to be retransmitted to the message 3 is one, and 1 indicates that the number of uplink resources scheduled to be retransmitted to the message 3 is plural.
  • the system message includes, but is not limited to, any one of an RMSI, an RRC message, a MAC CE, and a PDCCH order.
  • the network message sent by the network device to the terminal device carries the quantity of the uplink resource, where the quantity of the uplink resource indicates the number of the K uplink resources that are scheduled to be retransmitted by the message 3, that is, the quantity of the uplink resource.
  • the information indicates K.
  • the system message includes an RMSI, where the uplink resource quantity information may also be carried in any one of an RRC message, a MAC CE, and a PDCCH order.
  • the message 2 sent by the network device to the terminal device carries the uplink resource quantity information of the uplink resource, and the message 2 is the random access response sent by the network device to the terminal device.
  • the uplink resource quantity information indicates the number of K uplink resources scheduled for retransmission by the message 3, that is, the uplink resource quantity information indicates K.
  • the system message includes an RMSI, where the uplink resource quantity information may also be carried in any one of an RRC message, a MAC CE, and a PDCCH order.
  • the network device when the network device detects that the message 3 fails to be sent, the network device schedules K uplink resources for retransmission for the message 3, and the number of K is greater than the number of uplink resources that are scheduled to be transmitted to the message 3 last time. .
  • the network device schedules one uplink resource for the message 3; when the first transmission fails, the network device schedules K1 uplink resources for the message 3; when the second transmission fails, The network device schedules K2 uplink resources for message 3.
  • the network device schedules K3 uplink resources for message 3 until the number of retransmissions is equal to the maximum number of retransmissions or the total number of scheduled uplink resources is equal to the maximum allowed.
  • the number of uplink resources; wherein the maximum number of retransmissions and the maximum number of allowed uplink resources may be notified to the terminal device by the network device by any one of system message, DCI, RRC message or PDCCH order.
  • 1 ⁇ K1 ⁇ K2 ⁇ K3, and K1, K2, and K3 are integers, so that the number of uplink resources scheduled for each message 3 is greater than the number of uplink resources scheduled for message 3 last time.
  • the new air interface communication system supports: the network device schedules 1 message 3 for transmission through the message 2, and the network device can schedule multiple messages 3 for retransmission to reduce the access delay and reduce the collision. Probability. NR supports scheduling multiple Msg3 retransmission to reduce the access delay and contention probability.
  • the network device assigns a corresponding C-RNTI (different from the TC-RNTI in message 2) and/or TA (time advance) to the corresponding terminal device in the corresponding message 4.
  • the terminal device determines the contention resolution successful according to the content of the message 4, adopts the C-RNTI in the currently received message 4, and discards the TC-RNTI.
  • the network device does not assign a new C-RNTI to the message 4 corresponding to one of the messages 3.
  • the user equipment sends the message 3) after receiving the message 4 and completing the conflict resolution, the TC- The RNTI is set to C-RNTI.
  • the new air interface communication system supports: the network device schedules 1 uplink grant by message 2 for the transmission of the message 2, and the network device can schedule multiple uplink grants for the retransmission of the message 3 to reduce Access delay and reduce the probability of collision.
  • NR supports: gNB schedules one UL grant for Msg3 transmission by Msg2, and gNB may schedule multiple UL grants for Msg3 to reduce the access delay and contention probability.
  • the terminal device selects N uplink resources from the K uplink resources.
  • the terminal device receives configuration information from the network device for indicating retransmission of the message 3, and determines information of the K uplink resources according to the configuration information.
  • the configuration information may be one or more DCIs sent by the network device.
  • the terminal device selects N uplink resources from the K uplink resources according to a pre-stored or pre-configured selection rule, where N ⁇ K and N are integers.
  • the network device may notify the terminal device selection rule by at least one of system message, message 2, and DCI.
  • the terminal device may acquire N from at least one of message 2, DCI, RMSI, RRC message, MAC-CE message, and PDCCH order.
  • the terminal device pre-stores or pre-configures a mapping relationship between the type of the random access preamble and the number of selected uplink resources, and the terminal device determines the number of uplink resources according to the type of the random access preamble. N and / or K, select N uplink resources from K uplink resources.
  • the random access preamble 1 is a dedicated preamble when the link is interrupted, and the number of random access preamble 1 associations is 1; the random access preamble 2 is a dedicated preamble for beam management, and the number of random access preamble 2 associations is 2. It is assumed that the number of uplink resources indicated by the configuration information is 4, and when the message 3 fails to be transmitted, the terminal device determines that the message 3 corresponds to the random access preamble 1, and determines the number of associations of the random access preamble 1 according to the pre-stored or pre-configured mapping relationship. As shown in FIG. 1, the terminal device selects one uplink resource from the four uplink resources for retransmitting the message 3.
  • the terminal device determines that the message 3 corresponds to the random access preamble 2. According to the pre-stored or pre-configured mapping relationship, the number of associations of the random access preamble 2 is determined to be 2, and the terminal device selects from the four uplink resources. Two uplink resources are used to retransmit message 3.
  • the selection rule is: the terminal device randomly selects N uplink resources from the K uplink resources.
  • the probability that each of the uplink resources is selected is equal, and the terminal device randomly selects N uplink resources from the K uplink resources, that is, the terminal device selects N uplink resources from the K uplink resources.
  • the terminal device may retransmit the message 3 multiple times, and the number of retransmissions of the message 3 must be less than the maximum number of retransmissions, and the network device may pass the system message, the message 2, the DCI, Any one of the RRC message or the PDCCH order notifies the terminal device of the maximum number of retransmissions.
  • the network device schedules uplink resources for each retransmitted message 3.
  • the number of uplink resources scheduled for retransmission for message 3 may be in an increasing or non-decreasing relationship with the number of retransmissions, and the terminal device needs to select at least one of multiple uplink resources scheduled from the network device each time.
  • the uplink resource retransmits the message 3.
  • the selection rule and the number of the uplink resources of the network device may be the same or different, and the embodiment does not limit the present invention.
  • the terminal device retransmits the message 3 to the network device, where the network device receives the message 3 retransmitted by the terminal device.
  • the terminal device retransmits the message 3 to the network device according to the N uplink resources selected by S204.
  • the number of messages 3 retransmitted by the terminal device may be N, that is, one message 3 is retransmitted for each uplink resource.
  • the terminal device may send N messages 3 by using N transmit beams and/or antenna ports respectively according to the indication of the configuration information sent by the network device, and send 1 message 3 to each transmit beam and/or antenna port, and each sent message 3 may be The SRS, the DMRS, the PTRS, and/or the CSI-RS carried in each message 3 may be the same or different.
  • the terminal device may send N messages 3 in the same manner (for example, a transmit beam/antenna port) according to the indication of the configuration information sent by the network device.
  • the base station receives N messages 3 using different receive beams.
  • the network device may schedule multiple uplink resources for the message 3, and the uplink resources selected by the conflicting terminal devices may be different, so that the network device may be in different uplink resources.
  • Message 3 is detected on, reducing the probability of a collision occurring.
  • the network device After receiving the retransmitted message 3, the network device sends a message 4 to the terminal device.
  • the network device when the network device detects that the message 3 fails to be sent, the network device sends, to the terminal device, configuration information of multiple uplink resources used to indicate that the message 3 is retransmitted, so that the terminal device obtains multiple uplink resources. Selecting one or more uplink resources to retransmit at least one message 3 reduces the probability of retransmitting the message 3 with the same uplink resource by other terminal devices, thereby reducing the probability of collision occurrence and reducing the delay of random access.
  • the apparatus 4 shown in FIG. 4 can implement the network device side of the embodiment shown in FIG. 3, and the apparatus 4 includes a receiving unit 401 and a sending unit 402.
  • the receiving unit 401 is configured to receive the message 3 sent by the terminal device, for example: the receiving unit 401 performs the step of S301 in FIG. 3.
  • the sending unit 402 is configured to: if it detects that the message 3 fails to be sent, send, to the terminal device, configuration information of the K uplink resources used to indicate that the message 3 is retransmitted, where M is an integer greater than 1, for example, sending The unit performs the steps of S302 and S303 in FIG.
  • the device 4 may be a network device, and the device 4 may also be a field-programmable gate array (FPGA), a dedicated integrated chip, a system on chip (SoC), and a central unit.
  • FPGA field-programmable gate array
  • SoC system on chip
  • CPU central processor unit
  • NP network processor
  • MCU micro controller unit
  • PLD programmable logic device
  • an embodiment of the present invention further provides a device 5.
  • the device 5 is a network device, and the network device includes:
  • the memory 502 is configured to store programs and data.
  • the number of the memories may be one or more, and the type of the memory may be any form of storage medium.
  • the memory may be a random access memory (English: random access memory, RAM for short) or a read only memory (English: read only memory, abbreviated as: ROM) or a flash memory, wherein the memory 502 may be located separately in the terminal device, It may be located inside the processor 501.
  • the transceiver 503 is configured to send and receive signals.
  • the transceiver can be a separate chip, or can be a transceiver circuit in the processor 501 or as an input and output interface.
  • the transceiver may be at least one of a transmitter for performing a transmitting step in the device and a receiver for performing a receiving step in the device.
  • the transceiver 503 may further include a transmitting antenna and a receiving antenna.
  • the transmitting antenna and the receiving antenna may be two antennas that are separately provided, or may be one antenna.
  • the transceiver 503 is configured to receive the message 3 sent by the terminal device.
  • the transceiver 503 is configured to perform the steps of S301 in FIG.
  • the processor 501 is configured to execute the program code stored by the memory 502. When the program code is executed, the processor 501 is configured to instruct the transceiver 503 to send to the terminal device if the sending of the message 3 fails.
  • K is an integer greater than 1.
  • the processor 501 is configured to perform the steps of S302 and S303 in FIG.
  • the transceiver 503, the memory 502, and the processor 501 communicate with each other through an internal connection path, for example, by a bus connection.
  • the configuration information of the uplink resource is indicated by one downlink control information DCI; or
  • the configuration information of the uplink resource is indicated by K DCIs, and each DCI is configured with one uplink resource; or
  • the K DCIs are located in different frequency domain locations and/or time slots
  • the M DCIs are located in different frequency domain locations and/or time slots.
  • the configuration information includes uplink resource location information and/or uplink resource quantity information, where the uplink resource location information indicates a time domain location and/or a frequency domain location of the K uplink resources, where The uplink resource quantity information indicates the number of the K uplink resources.
  • the transceiver is further configured to send, to the terminal device, a system message SI, a message 2, a radio resource control RRC message, a media access control-control element MAC-CE message, and a physical downlink control channel instruction PDCCH.
  • a system message SI a message 2, a radio resource control RRC message, a media access control-control element MAC-CE message, and a physical downlink control channel instruction PDCCH.
  • At least one of the order; wherein, at least one of the system message SI, the message 2, the radio resource control RRC message, the media access control-control element MAC-CE message, and the physical downlink control channel command PDCCH order carries uplink resource quantity information
  • the uplink resource quantity information indicates the quantity of the K uplink resources.
  • the transceiver 503 is further configured to receive a random access preamble sent by the terminal device;
  • the processor 501 is further configured to determine that the type of the random access preamble is a preset type.
  • the system message or the message 2 further carries DCI configuration information, where the DCI configuration information indicates a time domain location, a quantity, and a frequency domain location of the K DCIs or the M DCIs. At least one of them.
  • the device 5 may be a chip, for example, may be a communication chip used in a network device for implementing related functions of the processor 501 in the network device.
  • the chip can be a field programmable gate array for implementing related functions, a dedicated integrated chip, a system chip, a central processing unit, a network processor, a digital signal processing circuit, a microcontroller, and a programmable controller or other integrated chip.
  • one or more memories may be included for storing program code, and when the program code is executed, the processor implements corresponding functions.
  • the computer program product includes one or more computer instructions (sometimes referred to as code or programs).
  • code or programs When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transmission to another website site, computer, server or data center via wired (eg coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device that includes one or more servers, data centers, etc. that can be integrated with the media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)) or the like.
  • a magnetic medium eg, a floppy disk, a hard disk, a magnetic tape
  • an optical medium eg, a DVD
  • a semiconductor medium such as a solid state disk (SSD)
  • the apparatus 6 shown in FIG. 6 can implement the terminal device side of the embodiment shown in FIG. 3, and the apparatus 6 includes: a sending unit 601, an obtaining unit 602, and a retransmission unit 603.
  • the sending unit 601 is configured to send a message 3 to the network device.
  • the obtaining unit 602 is configured to: if the message 3 fails to be sent, receive configuration information of the K uplink resources from the network device for indicating that the message 3 is retransmitted; K is an integer greater than 1.
  • the retransmission unit 603 is configured to select N uplink resources from the K uplink resources, and retransmit the message 3 according to the N uplink resources; where N ⁇ K, and N is an integer greater than 0.
  • the device 6 may be a terminal device, and the device 6 may also be a field-programmable gate array (FPGA), a dedicated integrated chip, a system on chip (SoC), and a central unit for implementing related functions.
  • FPGA field-programmable gate array
  • SoC system on chip
  • CPU central processor unit
  • NP network processor
  • MCU micro controller unit
  • PLD programmable logic device
  • an embodiment of the present invention further provides a device 7.
  • the device 7 is a terminal device, and the terminal device includes:
  • the memory 702 is configured to store programs and data.
  • the number of the memories may be one or more, and the type of the memory may be any form of storage medium.
  • the memory may be a random access memory (English: random access memory, RAM for short) or a read only memory (English: read only memory, abbreviated as: ROM) or a flash memory, wherein the memory 702 may be located separately in the terminal device, It may be located inside the processor 701.
  • the transceiver 703 is configured to send and receive signals.
  • the transceiver can be a separate chip, or can be a transceiver circuit in the processor 701 or as an input and output interface.
  • the transceiver may be at least one of a transmitter for performing a transmitting step in the device and a receiver for performing a receiving step in the device.
  • the transceiver 703 may further include a transmitting antenna and a receiving antenna, and the transmitting antenna and the receiving antenna may be two antennas that are separately provided, or may be one antenna.
  • the transceiver 703 is configured to send a message 3 to the network device.
  • the transceiver 703 is configured to perform the steps of S303 in FIG.
  • the processor 701 is configured to execute the program code stored in the memory 702. When the program code is executed, the processor 701 is configured to: if the message 3 fails to be sent, acquire, to indicate that the message 3 is retransmitted. Configuration information of K uplink resources; K is an integer greater than 1;
  • N ⁇ K and N is an integer greater than 0.
  • the processor 701 is configured to perform the steps of S304 and S305 in FIG.
  • the transceiver 703, the memory 702, and the processor 701 communicate with each other through an internal connection path, for example, via a bus.
  • the device 7 may be a chip, for example, may be a communication chip used in a network device for implementing related functions of the processor 701 in the network device.
  • the chip can be a field programmable gate array for implementing related functions, a dedicated integrated chip, a system chip, a central processing unit, a network processor, a digital signal processing circuit, a microcontroller, and a programmable controller or other integrated chip.
  • one or more memories may be included for storing program code, and when the program code is executed, the processor implements corresponding functions.
  • the computer program product includes one or more computer instructions (sometimes referred to as code or programs).
  • code or programs When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transmission to another website site, computer, server or data center via wired (eg coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device that includes one or more servers, data centers, etc. that can be integrated with the media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)) or the like.
  • a magnetic medium eg, a floppy disk, a hard disk, a magnetic tape
  • an optical medium eg, a DVD
  • a semiconductor medium such as a solid state disk (SSD)
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above embodiments it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present invention are generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in or transmitted by a computer readable storage medium.
  • the computer instructions can be from a website site, computer, server or data center to another website site by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.) Transfer from a computer, server, or data center.
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)).
  • the program can be stored in a computer readable storage medium, when the program is executed
  • the flow of the method embodiments as described above may be included.
  • the foregoing storage medium includes various media that can store program codes, such as a ROM or a random access memory RAM, a magnetic disk, or an optical disk.

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Abstract

La présente invention concerne un procédé et un dispositif de communication. Dans un cas où un dispositif de réseau détecte qu'un message 3 ne parvient pas à être transmis, le dispositif de réseau envoie à un dispositif terminal des informations de configuration d'une pluralité de ressources de liaison montante pour indiquer le message 3 devant être retransmis, de sorte que le dispositif terminal sélectionne une ou plusieurs ressources de liaison montante parmi la pluralité de ressources de liaison montante pour retransmettre au moins un message 3. Par conséquent, la possibilité que d'autres dispositifs terminaux utilisent les mêmes ressources de liaison montante pour retransmettre le message 3 est réduite, ce qui abaisse la probabilité d'un conflit et diminue un retard temporel pour un accès aléatoire.
PCT/CN2018/099049 2017-08-08 2018-08-06 Procédé et dispositif de communication WO2019029498A1 (fr)

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