WO2020248944A1 - Procédé et appareil d'accès aléatoire - Google Patents

Procédé et appareil d'accès aléatoire Download PDF

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Publication number
WO2020248944A1
WO2020248944A1 PCT/CN2020/094964 CN2020094964W WO2020248944A1 WO 2020248944 A1 WO2020248944 A1 WO 2020248944A1 CN 2020094964 W CN2020094964 W CN 2020094964W WO 2020248944 A1 WO2020248944 A1 WO 2020248944A1
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WIPO (PCT)
Prior art keywords
random access
terminal device
carrier
network device
nul
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PCT/CN2020/094964
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English (en)
Chinese (zh)
Inventor
何青春
常俊仁
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华为技术有限公司
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Publication of WO2020248944A1 publication Critical patent/WO2020248944A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • 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
    • 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
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Definitions

  • This application relates to the field of mobile communication technology, and in particular to a random access method and device.
  • the terminal when a cell is configured with a normal uplink (NUL) carrier and a supplementary uplink (SUL) carrier, if the terminal (UE) performs the downlink measurement in the cell A value greater than a pre-configured reference threshold indicates that the UE is closer to the cell center. At this time, the UE will select the NUL carrier for uplink access, that is, send a random access request through the NUL carrier.
  • NUL normal uplink
  • SUL supplementary uplink
  • This application provides a random access method and device for optimizing a two-step random access scheme.
  • this application provides a random access method, which can be executed by a UE (in this application, the UE may also be referred to as a terminal device or a terminal device).
  • the terminal device can determine that the downlink measurement value is not lower than the first measurement threshold, and the downlink measurement value is the measurement value in the downlink direction between the terminal device and the network device; the terminal device can use the normal uplink NUL carrier and A target carrier is selected from the auxiliary uplink SUL carrier, the target carrier is configured with a first random access resource, the first random access resource is used for random access of the terminal device, the NUL carrier and the SUL carrier Configured by the network device; the terminal device may send a random access request to the network device through the selected first random access resource of the target carrier, and the random access request includes a random access preamble and Upstream data.
  • the terminal device can select the target carrier configured with the first random access resource from the NUL carrier or the SUL carrier, and initiate two steps through the target carrier Random access, because the two-step random access is no longer initiated only through the NUL carrier, the success rate of the two-step random access can be improved.
  • the downlink measurement value includes one or more of RSRP, RSRQ, or SINR.
  • the first measurement threshold corresponding to different downlink measurement values can be set.
  • the terminal device may also receive the configuration information of the first random access resource to obtain the related configuration of the first random access resource.
  • the configuration information of the first random access resource may be used to indicate one or more of the following information: preamble code index; or, time domain and frequency domain resources where the preamble code is located; or, preamble code and synchronization signal block SSB Or, the time domain and frequency domain resources where the physical layer shared channel PUSCH is located; or, the mapping relationship between the time domain and frequency domain resources where the PUSCH is located and the SSB.
  • the configuration information of the first random access resource may also be used to indicate that the first random access resource is configured in the NUL and/or SUL.
  • the terminal device may determine the NUL carrier as The target carrier.
  • the terminal device may determine the SUL carrier as the target carrier.
  • the NUL carrier is configured with the first random access resource, or the NUL carrier is not configured with the first random access resource.
  • both the NUL carrier and the SUL carrier are configured with the first random access resource, and the second measurement The terminal device with a value higher than the first measurement value may determine the NUL carrier as the target carrier.
  • the terminal device may receive a fallback random access response from the network device.
  • the target carrier includes the NUL carrier
  • the terminal device may send the network device to the network device through the SUL carrier.
  • Upstream data Therefore, in the case that the two-step random access fails, the terminal device will also retreat to the SUL to initiate a four-step random access, which further improves the success rate of random access.
  • the above uplink data can be similar to Msg3 in the competitive random access process.
  • the uplink data is carried in one or more of the following messages: RRC connection establishment request message; or, RRC reestablishment request message; or, RRC connection restoration message; or, system message acquisition request message; or, beam recovery request message .
  • the terminal device Before sending the uplink data to the network device via the SUL carrier, the terminal device may respond to the fallback random access response by sending the random access preamble to the network device via the SUL carrier, and from The network device receives a random access response corresponding to the random access preamble.
  • the terminal device may receive a first instruction from the network device, where the first instruction is used to instruct to access the network device in a two-step random access manner. Thereafter, the terminal device may respond to the first instruction to send a random access request including a random access preamble and uplink data, so as to realize the control of the random access mode of the terminal device by the network device.
  • this application provides a random access method, which can be implemented by a network device.
  • a network device can receive a random access request from a terminal device through the first random access resource of a target carrier, the random access request includes a preamble code and uplink data, and the target carrier includes the terminal device NUL carrier or SUL carrier; the network equipment may send the random access response corresponding to the random access request to the terminal device.
  • the random access response here may be the MsgB of the two-step random access process, that is, the RAR information and Msg4 of the four-step random access process.
  • the network device may also send the configuration information of the first random access resource to the terminal device, so as to implement the configuration of the first random access resource.
  • the configuration information of the first random access resource is used to indicate one or more of the following information: preamble code index; or, the time domain and frequency domain resources where the preamble code is located; or, the combination of the preamble code and SSB Mapping relationship; or, time domain and frequency domain resources where PUSCH is located; or, mapping relationship between time domain and frequency domain resources where PUSCH is located and SSB.
  • the configuration information of the first random access resource may also be used to indicate that the first random access resource is configured in the NUL and/or SUL.
  • the network device may also receive all data from the terminal device through the SUL carrier.
  • the upstream data can be similar to Msg3 in the competitive random access process.
  • the above uplink data is carried in one or more of the following messages: RRC connection establishment request message; or, RRC reestablishment request message; or, RRC connection restoration message; or, system message acquisition request message; or, beam recovery request message, Such as contention-based beam recovery request message.
  • the network device may also receive the random access preamble from the terminal device through the SUL carrier and send it to the terminal device. Sending a random access response corresponding to the random access preamble.
  • the network device may also send a first instruction to the terminal device, where the first instruction is used to instruct to access the network device in a two-step random access manner.
  • this application provides a communication device, and this application provides a communication device that can be used to execute the steps performed by the terminal device in the first aspect or any possible design of the first aspect.
  • the communication device can implement each function in the above-mentioned methods through a hardware structure, a software module, or a hardware structure plus a software module.
  • the communication device may include a communication module and a processing module coupled with each other.
  • the communication module may be used to support the communication device to communicate, and the processing module may be used for the communication device to perform processing operations, such as generating information to be sent. /Message, or process the received signal to get information/message.
  • the communication device may include a communication interface, a memory, a processor, and the like that are coupled to each other.
  • the processing module may be used to determine that the downlink measurement value is not lower than a first measurement threshold, and the downlink measurement value is a measurement value in the downlink direction between the terminal device and the network device; processing The module can also be used to select a target carrier from a normal uplink NUL carrier and an auxiliary uplink SUL carrier, the target carrier is configured with a first random access resource, and the first random access resource is used for random access of the terminal device
  • the NUL carrier and the SUL carrier are configured by the network device;
  • the communication module may be used to send a random access request to the network device through the first random access resource of the target carrier, and the random access
  • the incoming request includes random access preamble code and uplink data.
  • the above downlink measurement value includes one or more of RSRP, RSRQ, or SINR.
  • the communication module may also be used to receive the configuration information of the first random access resource.
  • the configuration information of the first random access resource is used to indicate one or more of the following information: preamble code index; or, time domain and frequency domain resources where the preamble code is located; or, preamble code and synchronization signal block SSB Or, the time domain and frequency domain resources where the physical layer shared channel PUSCH is located; or, the mapping relationship between the time domain and frequency domain resources where the PUSCH is located and the SSB.
  • the processing module may determine the NUL carrier Is the target carrier.
  • the processing module may determine the SUL carrier as the target carrier.
  • the NUL carrier is configured with the first random access resource, or the NUL carrier is not configured with the first random access resource.
  • both the NUL carrier and the SUL carrier are configured with the first random access resource, and the second measurement If the value is higher than the first measured value, the processing module may determine the NUL carrier as the target carrier.
  • the communication module may also be used to receive a fallback random access response from the network device; if the target carrier includes the NUL carrier, the communication module may also be used to send the SUL carrier to the The network device sends the uplink data.
  • the above uplink data can be similar to Msg3 in the competitive random access process.
  • the above uplink data is carried in one or more of the following messages: RRC connection establishment request message; or, RRC reestablishment request message; or, RRC connection restoration message; or, system message acquisition request message; or, beam recovery request message, Such as contention-based beam recovery request message.
  • the communication module may be further configured to send the random access preamble to the network device through the SUL carrier in response to the fallback random access response, and receive the random access preamble from the network device The corresponding random access response.
  • the communication module may be further configured to receive a first instruction from the network device, where the first instruction is used to instruct to access the network device in a two-step random access manner.
  • the communication device may include a processor.
  • the steps performed by the above processing modules can be executed by the processor.
  • the communication device may include a transceiver, and the transceiver may be used to support the above device to communicate with other devices or devices. Specifically, the transceiver can be used to perform the steps performed by the above communication module.
  • the device may further include a memory, the memory may be used to store a program, and the program may be executed by the processor to perform the steps performed by the above processing module.
  • this application provides a communication device, and this application provides a communication device that can be used to perform the steps performed by the network device in the second aspect or any possible design of the second aspect.
  • the communication device can implement each function in the above-mentioned methods through a hardware structure, a software module, or a hardware structure plus a software module.
  • the communication device may include a communication module and a processing module coupled with each other.
  • the communication module may be used to support the communication device to communicate, and the processing module may be used for the communication device to perform processing operations, such as generating information to be sent. /Message, or process the received signal to get information/message.
  • the communication device may include a communication interface, a memory, a processor, and the like that are coupled to each other.
  • the communication module may be configured to receive a random access request from the terminal device through the first random access resource of the target carrier, and the random access request includes a preamble code and uplink data, so
  • the target carrier includes the NUL carrier or the SUL carrier of the terminal device; the communication module may also be configured to send a random access response corresponding to the random access request to the terminal device.
  • the communication module may also send configuration information of the first random access resource to the terminal device.
  • the configuration information of the first random access resource is used to indicate one or more of the following information: preamble code index; or, the time domain and frequency domain resources where the preamble code is located; or, the combination of the preamble code and SSB Mapping relationship; or, time domain and frequency domain resources where PUSCH is located; or, mapping relationship between time domain and frequency domain resources where PUSCH is located and SSB.
  • the communication module may also be configured to receive the uplink data from the terminal device through the SUL carrier.
  • the above uplink data can be similar to Msg3 in the competitive random access process.
  • the above uplink data is carried in one or more of the following messages: RRC connection establishment request message; or, RRC reestablishment request message; or, RRC connection restoration message; or, system message acquisition request message; or, beam recovery request message, Such as contention-based beam recovery request message.
  • the communication module may also be configured to receive the random access preamble from the terminal device through the SUL carrier, and send a random access response corresponding to the random access preamble to the terminal device.
  • the communication module may also send a first instruction to the terminal device, where the first instruction is used to instruct to access the network device in a two-step random access manner.
  • the communication device may include a processor.
  • the steps performed by the above processing modules can be executed by the processor.
  • the communication device may include a transceiver, and the transceiver may be used to support the above device to communicate with other devices or devices. Specifically, the transceiver can be used to perform the steps performed by the above communication module.
  • the device may further include a memory, the memory may be used to store a program, and the program may be executed by the processor to perform the steps performed by the above processing module.
  • the present application provides a communication system, which may include the communication device shown in the third aspect and/or the communication device shown in the fourth aspect.
  • this application provides a computer storage medium in which instructions (or programs) are stored, which when invoked and executed on a computer, cause the computer to execute the first aspect or the first aspect described above. Any possible design, or the method described in the second aspect or any possible design of the second aspect.
  • the present application provides a computer program product.
  • the basic computing product may contain instructions that, when the computer program product runs on a computer, cause the computer to execute the first aspect or any one of the first aspects described above. Design, or, the method described in the second aspect or any one of the possible designs of the second aspect.
  • the present application provides a chip or a chip system including the chip, and the chip may include a processor.
  • the chip may also include a memory (or storage module) and/or a transceiver (or communication module).
  • the chip can be used to implement the method described in the first aspect or any one possible design of the first aspect, or the second aspect or any one possible design of the second aspect.
  • the chip system may be composed of the above-mentioned chips, or may include the above-mentioned chips and other discrete devices, such as a memory (or storage module) and/or a transceiver (or communication module).
  • FIG. 1 is a schematic structural diagram of a wireless communication system provided by an embodiment of this application.
  • FIG. 2 is a schematic diagram of the architecture of another wireless communication system provided by an embodiment of the application.
  • FIG. 3 is a schematic flowchart of a random access method provided by an embodiment of this application.
  • FIG. 4 is a schematic flowchart of another random access method provided by an embodiment of this application.
  • FIG. 5 is a schematic flowchart of another random access method provided by an embodiment of this application.
  • FIG. 6 is a schematic flowchart of another random access method provided by an embodiment of this application.
  • FIG. 7 is a schematic structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 8 is a schematic structural diagram of another communication device provided by an embodiment of this application.
  • FIG. 9 is a schematic structural diagram of another communication device provided by an embodiment of this application.
  • FIG. 10 is a schematic structural diagram of another communication device provided by an embodiment of this application.
  • FIG. 11 is a schematic structural diagram of another communication device provided by an embodiment of this application.
  • FIG. 12 is a schematic structural diagram of another communication device provided by an embodiment of this application.
  • the present application can be applied to a wireless communication system 100, and the wireless communication system may include a UE 101 and a network device 102.
  • the wireless communication system 100 can be applied to both low frequency scenarios (sub 6G) and high frequency scenarios (above 6G).
  • Application scenarios of the wireless communication system 100 include, but are not limited to, global system of mobile communication (GSM) system, code division multiple access (CDMA) system, and wideband code division multiple access (wideband code division multiple access) , WCDMA) system, general packet radio service (General Packet Radio Service, GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (time division) duplex, TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, the future fifth-generation system or new radio (NR) Communication system, etc.
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD time division duplex
  • UMTS universal mobile
  • the UE 101 shown above can be a user equipment, a terminal (terminal), a mobile station (MS), a mobile terminal (mobile terminal), etc.
  • the UE 101 can communicate with one or more networks of one or more communication systems
  • the device communicates and accepts network services provided by the network device.
  • the network device here includes but is not limited to the network device 102 shown in the figure.
  • UE 101 can be a device with wireless transceiver function, which can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; it can also be deployed on water (such as ships, etc.); it can also be deployed in the air (such as aircraft, Balloons and satellites are classy).
  • the UE may be a mobile phone (mobile phone), a tablet computer (pad), a computer with wireless transceiving function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, an industrial control (industrial control) Wireless terminals in, self-driving (self-driving), wireless terminals in remote medical, wireless terminals in smart grid, wireless terminals in transportation safety, Wireless terminals in a smart city, wireless terminals in a smart home, etc.
  • the UE shown in FIG. 3 may include a terminal device 101.
  • the UE 101 may also be a communication chip with a communication module.
  • the network device 102 shown above may include an access network device (or called an access website point).
  • the access network equipment refers to equipment that provides network access functions, such as a radio access network (RAN) base station and so on.
  • the network device 102 may specifically include a base station (base station, BS), or includes a base station and a radio resource management device for controlling the base station, etc.
  • the network device 102 may include a relay station (relay device), an access point, a vehicle-mounted device, and Wearable devices and base stations in the future 5G network, base stations in the future evolved public land mobile network (PLMN) network, or NR base stations, etc.
  • PLMN public land mobile network
  • the network equipment 102 includes, but is not limited to: next-generation base stations (gnodeB, gNB) in 5G, evolved node B (evolved node B, eNB), radio network controller (RNC), node B ( node B, NB), base station controller (BSC), base transceiver station (BTS), home base station (for example, home evolved nodeB, or home node B, HNB), baseband unit (baseBand unit) , BBU), transmission point (transmitting and receiving point, TRP), transmission point (transmitting point, TP), or mobile switching center, etc.
  • the network device 102 may also be a communication chip with a communication module.
  • the network device 102 can serve as a RAN base station to provide wireless network connection to the UE 101.
  • the network device 102 can serve as a 4G access network-an evolved universal mobile telecommunications system.
  • UMTS Universal Mobile Telecommunications
  • E-UTRAN evolved universal mobile telecommunications system
  • network equipment 102 can be used as a 5G access network-5G RAN access network equipment, or The network device 102 can be used as an access network device in a future wireless communication system.
  • the following takes the 5G network architecture shown in FIG. 2 as an example to describe a wireless communication system to which the embodiments of the present application can be applied.
  • the wireless communication system shown in FIG. 2 may include a 5G core network 201, and the wireless communication system may also include a 5G access network 202, wherein the 5G core network 201 and the 5G access network 202 can interact with each other through an interface.
  • the functional entity used to implement the method involved in the embodiment of the present application may be a network element and/or terminal device in the 5G core network 201, etc.
  • the UE 101 shown in FIG. 1 above may include a terminal device connected to a base station in the 5G access network 202, for example, the UE 203 shown in FIG. 2.
  • the UE 203 is connected to the access network device 204 through a wireless link, and the access network device 204 may be a 5G base station in the 5G access network 202.
  • the UE 101 shown in FIG. 1 above may include a UE connected to a relay station, such as the UE 205 shown in FIG. 2.
  • the UE 205 is connected to the relay station 206, and the relay station 206 is connected to the access network device 204 through a relay link.
  • the network device 102 shown in FIG. 1 above may include the access network device 204 in the 5G access network 202 shown in FIG. 2, or may be a relay station connected to the access network device 204 as shown in FIG. 206 and so on.
  • the four-step random access procedure may include the following steps:
  • the terminal device sends Msg1 to the network device.
  • Msg1 is a random access request, including a random access preamble code (or preamble, preamble), the random access preamble can be randomly selected by the terminal device, and the terminal device sends Msg1 to the network device on the RACH .
  • the network device receives Msg1 from the terminal device.
  • the network device sends Msg2 to the terminal device.
  • Msg2 is the random access response (RAR) information for the preamble, including reserved bits (usually denoted by R), timing advance (TA) command, uplink grant (uplink grant) ) And TC-RNTI etc.
  • RAR random access response
  • TA timing advance
  • uplink grant uplink grant
  • TC-RNTI a temporary cell wireless network temporary identifier allocated by the network device to the terminal device.
  • the terminal device receives Msg2 from the network device.
  • the terminal device can use the RA-RNTI on the PDCCH to monitor the DCI scheduling the PDSCH carrying the Msg2.
  • the terminal device sends Msg3 to the network device.
  • Msg3 is uplink data or uplink payload (UL payload), and Msg3 is carried on the physical layer uplink shared channel (PUSCH).
  • PUSCH physical layer uplink shared channel
  • Msg3 involved in S13 can be referred to as uplink data.
  • the terminal device immediately starts the contention resolution timer after sending Msg3 (the timer must be restarted each time Msg3 is retransmitted), and the terminal device monitors the network device to return to itself before the timer expires. Competition resolution news.
  • the uplink data may include uplink small packet data, such as data such as the identification of the terminal device.
  • the network device receives Msg3 from the terminal device.
  • S14 The network device sends Msg4 to the terminal device.
  • Msg4 stands for contention resolution message (CRM).
  • the network device when the network device sends a contention resolution message to the terminal device, when the terminal device is in the RRC idle state or the RRC inactive state, the TC-RNTI can be used to scramble the DCI.
  • the terminal monitors the DCI scrambled by the TC-RNTI, it demodulates the response information indicated by the DCI and carried on the PDSCH, and checks the contention resolution identifier carried in the PDSCH. , CRID) is matched with the common control channel serving data unit (CCCH SDU) carried by the Msg3 of the terminal device. If they are the same, the terminal device considers that the contention resolution is successful. Otherwise, the terminal device considers that this random access has failed.
  • CCCH SDU common control channel serving data unit
  • the two-step random access method includes the following steps:
  • the terminal device sends MsgA to the network device.
  • MsgA is a random access request, including a random access preamble and UL payload, which is equivalent to Msg1 and Msg3 in the 4-step RACH in FIG. 3 above.
  • S22 The network device sends MsgB to the terminal device.
  • MsgB is the response information for MsgA, and includes at least one of the response information for the preamble and the response information for the PUSCH.
  • the response information for the random access preamble is the random access response information, including TA command, TC-RNTI, and UL grant.
  • the response information for PUSCH includes contention resolution messages, such as CRID.
  • the network equipment may use a common RNTI to add DCI to the terminal equipment in the RRC idle state or the RRC inactive state. Disturb. Based on this method, the terminal device needs to demodulate the PDSCH indicated by the received DCI to obtain the CRID carried in the response information carried by the PDSCH, and compare it with the UE ID or UL CCCH SDU before it can confirm whether the contention resolution is successful.
  • the terminal device that initiates the two-step random access as shown in FIG. 4 and the terminal device that initiates the four-step random access as shown in FIG. 3 can use shared random access time-frequency resources (RACH Occasion, RO),
  • the random access time-frequency resource can be used to initiate two-step random access or four-step random access.
  • the terminal device that initiates two-step random access uses random access time-frequency resources dedicated to initiating two-step random access
  • the random access time-frequency resource used to initiate random access is referred to as the first random access resource below.
  • the first random access resource is a shared random access time-frequency resource used to initiate two-step random access and four-step random access, or it may be a random access time-frequency resource dedicated to initiate two-step random access. Resources.
  • an embodiment of the present application provides a random access method. As shown in Figure 5, the method may include the following steps:
  • S31 The terminal device determines that the downlink measurement value is not lower than the first measurement threshold.
  • the downlink measurement value is a measurement value in the downlink direction between the terminal device and the network device.
  • the terminal device selects a target carrier from the NUL carrier and the SUL carrier, where the selected target carrier is configured with the first random access resource.
  • the first random access resource is used for the terminal device to initiate random access.
  • the NUL carrier, the SUL carrier, and the first random access resource can be configured by the network device.
  • the terminal device sends a random access request to the network device through the first random access resource of the target carrier, where the random access request includes a random access preamble and uplink data.
  • the random access request is equivalent to the random access request in two-step random access, such as MsgA shown in FIG. 4.
  • the random access preamble is Msg1 as shown in Figure 3
  • the uplink data is the combination of Msg3 as shown in Figure 3.
  • the network device sends a random access response, where the random access response corresponds to the random access request.
  • the random access response here may be the MsgB of the two-step random access process, that is, the RAR information and Msg4 of the four-step random access process.
  • the terminal device can select the target carrier configured with the first random access resource from NUL and SUL under the condition that the downlink measurement value is not lower than the first measurement threshold, and initiate two operations through the target carrier. Step random access, thereby improving the success rate of two-step random access when NUL carrier and SUL carrier coexist.
  • the terminal device can obtain the downlink measurement value involved in S31 through downlink measurement.
  • the downlink measurement values mentioned here include but are not limited to reference signal receiving power (RSRP), reference signal receiving quality (RSRQ), or reference signal signal to interference plus (signal to interference plus)
  • RSRP reference signal receiving power
  • RSRQ reference signal receiving quality
  • SINR noise ratio
  • the above first measurement threshold may include values corresponding to one or more downlink measurement values of RSRP, RSRQ, or SINR, respectively.
  • the terminal device may compare the RSRP with the first measurement threshold corresponding to the RSRP.
  • the terminal device may compare the RSRQ with the first measurement threshold corresponding to the RSRQ.
  • the terminal device may compare the SINR with the first measurement threshold corresponding to the SINR.
  • the terminal device may determine that the downlink measurement value is not lower than the first measurement threshold when any one of the downlink measurement values of RSRP, RSRQ, or SINR is not lower than the corresponding first measurement threshold.
  • the downlink measurement value includes RSRP, and when the RSRP is not lower than the first measurement threshold corresponding to the RSRP, the terminal device determines that the downlink measurement value is not lower than the first measurement threshold.
  • the terminal device may determine that the downlink measurement value is not lower than the first measurement threshold when any multiple downlink measurement values in the RSRP, RSRQ, or SINR are not lower than the corresponding first measurement threshold.
  • the downlink measurement value includes RSRP and RSRQ.
  • RSRP is not lower than the first measurement threshold corresponding to RSRP
  • RSRQ is not lower than the first measurement threshold corresponding to RSRQ
  • the terminal device determines that the downlink measurement value is not lower than the first measurement threshold.
  • the downlink measurement value includes RSRP, RSRQ, and SINR, when RSRP is not lower than the first measurement threshold corresponding to RSRP, RSRQ is not lower than the first measurement threshold corresponding to RSRQ, and SINR is not lower than the first measurement threshold corresponding to SINR At this time, the terminal device determines that the downlink measurement value is not lower than the first measurement threshold.
  • the expression “the downlink measured value is not lower than the first measurement threshold” can also be replaced with “the downlink measured value is higher than the first measurement threshold”.
  • the terminal device may receive configuration information of the first random access resource, and the configuration information may be used to configure the above first random access resource.
  • the configuration information of the first random access resource may be sent by the network device.
  • the configuration information of the first random access resource may be specifically used to indicate the random access preamble index (index), the time domain and frequency domain resources where the random access preamble is located, or a part or part of the time domain and frequency domain resources where the PUSCH is located. All information.
  • the first random access resource may include a random access preamble index, time domain and frequency domain resources where the random access preamble is located, or time domain and frequency domain resources where the PUSCH is located.
  • the random access preamble index may include the index of the random access preamble sent by the terminal device in S33.
  • the time domain and frequency domain resources where the random access preamble is located may include the time domain and frequency domain resources used when the terminal device sends the random access preamble in S33.
  • the time domain and frequency domain resources where the PUSCH is located may include the time domain and frequency domain resources used by the terminal device to send uplink data in S33.
  • the configuration information of the first random access resource may also include a mapping relationship between a random access preamble and a synchronization signal block (synchronization signal block, SSB).
  • SSB can be used for cell search.
  • the SSB may include part or all of the system information transmitted by the primary synchronization signal (PSS), the secondary synchronization signal (SSS), or the physical broadcast channel (PBCH).
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • PBCH physical broadcast channel
  • each SSB will correspond to a beamforming direction.
  • the network device can know the corresponding SSB according to the preamble preamble sent by the UE. Random access response (such as sending Msg2 or MsgB) in the shaping direction of SSB.
  • the configuration information of the first random access resource may also include the mapping relationship between the time domain and frequency domain resources where the PUSCH is located and the SSB.
  • the network device can determine the corresponding SSB according to the time domain and frequency domain resources of the PUSCH carrying the uplink data sent by S33, so as to perform random access response in the corresponding shaping direction of the SSB.
  • the configuration information of the first random access resource may also include the mapping relationship between the PRACH resource and the SSB.
  • the PRACH resource refers to the random access preamble selected by the terminal device and the time-frequency domain resources for sending the random access preamble through Msg1 or MsgA. Accordingly, after receiving the random access request, the network device can determine the random access preamble selected by the terminal device and the SSB corresponding to the time-frequency domain resource for sending the random access preamble according to the mapping relationship between PRACH resources and SSB. Thus, random access response is performed in the shaping direction corresponding to the SSB.
  • the configuration information of the first random access resource may also include the mapping relationship between the time domain and frequency domain resources where the PUSCH is located and the preamble and/or PRACH resources.
  • the network device may send the configuration information of the above first random access resource through a broadcast message or radio resource control (radio resource control, RRC) signaling.
  • RRC radio resource control
  • the network device may instruct to configure the above first random access resource on the NUL carrier through a broadcast message or RRC signaling. And/or, the network device may instruct to configure the above first random access resource on the SUL carrier through a broadcast message or RRC signaling.
  • the terminal equipment can also obtain the information of the NUL carrier and the SUL carrier according to the carrier configuration information of the network equipment.
  • the carrier configuration information may be specifically used to indicate information such as bandwidth part (BWP) or secondary cell (SCELL) of the NUL carrier and the SUL carrier.
  • BWP bandwidth part
  • SCELL secondary cell
  • Example 1 If the NUL carrier is configured with the first random access resource, and the SUL carrier is not configured with the first random access resource, the terminal device may determine the NUL carrier as the target carrier.
  • Example 2 If the SUL carrier is configured with the first random access resource, and the NUL carrier is not configured with the first random access resource, the terminal device may determine the SUL carrier as the target carrier.
  • Example 3 If the SUL carrier is configured with the first random access resource, and the NUL carrier is configured with the first random access resource, the terminal device may determine the SUL carrier as the target carrier.
  • Example 4 If the terminal device determines that the downlink measurement value is lower than the first measurement threshold in S31, the terminal device may determine the SUL carrier as the target carrier. When the downlink measurement value is lower than the first measurement threshold, it means that the terminal device is currently far from the center of the cell. At this time, the terminal device can select the SUL carrier as the target cell to initiate two-step random access or four-step random access.
  • Example 5 If the terminal device determines in S31 that the downlink measurement value is higher than the first measurement threshold, and the downlink measurement value is higher (or not lower than) the second measurement threshold, the terminal device may determine the NUL carrier as the target carrier.
  • the method for setting the second measurement threshold may refer to the first measurement threshold, and the second measurement threshold is higher than the first measurement threshold.
  • both the NUL carrier and the SUL carrier can be configured with the first random access resource.
  • the terminal device can determine to initiate a two-step random access according to the instruction information from the network device. Specifically, the network device may indicate whether the terminal device can initiate two-step random access. For example, the network device sends a first instruction to the terminal device, and the first instruction is used to instruct the terminal device to access the network device in a two-step random access manner.
  • the terminal device can send the random access preamble and uplink data in the random access request in a time division manner to initiate two-step random access.
  • the response message may include the above MsgB.
  • the base station fails to decode the terminal device successfully due to multiple users competing to use the PUSCH resource of the uplink data, or due to PUSCH channel quality, uplink synchronization, etc.
  • the network device may send a fallback random access response in S34 at this time.
  • the terminal device can initiate a four-step random access again, or perform MsgA retransmission.
  • the terminal device can send uplink data to the network device, and the uplink data can be similar to Msg3 in the competitive random access process.
  • the terminal device may resend the random access preamble, that is, Msg1, to the network device.
  • the terminal device sends the random access preamble and uplink data to the network device through the NUL carrier, and if the terminal device receives the fallback random access response in S34, the terminal device can use the SUL carrier
  • the configured first random access resource initiates a four-step random access to the network device. Specifically, after receiving the fallback random access response in S34, the terminal device may resend the uplink data, namely Msg3, to the network device.
  • the above Msg3 may be carried in an RRC connection establishment request message, an RRC reestablishment request message, an RRC connection recovery message, a system message acquisition request message, or a beam recovery request message, such as a contention-based beam recovery request message.
  • the terminal device after receiving the fallback random access response in S34, can resend the random access preamble, namely Msg1, to the network device, and after receiving the random access preamble sent by the network device, it corresponds to the random access preamble.
  • the terminal device After the random access response is Msg2, the terminal device sends uplink data, namely Msg3, to the network device.
  • the random access method provided in the embodiment of the present application may include the following steps:
  • the terminal device selects a target carrier from the NUL carrier and the SUL carrier according to the downlink measurement value, where the target carrier is configured with the first random access resource.
  • the terminal device may determine the NUL carrier as the target Carrier.
  • the terminal device may determine the SUL carrier as the target carrier.
  • the terminal device may determine the SUL carrier as the target carrier.
  • the terminal device may determine the SUL carrier as the target carrier.
  • the terminal device can determine the NUL carrier as the target carrier.
  • the terminal device sends the MsgA to the network device through the first random access resource of the target carrier.
  • MsgA includes random access preamble and uplink data.
  • the network device receives MsgA.
  • S44 The network device sends a response message corresponding to MsgA to the terminal device.
  • the terminal device receives the response message corresponding to MsgA.
  • the response message corresponding to MsgA can be MsgB or fallback random access response.
  • the method may further include the following steps:
  • S45 The terminal device sends Msg1 to the network device.
  • Msg1 includes the random access preamble in MsgA.
  • the network device receives Msg1.
  • the network device sends Msg2 to the terminal device.
  • the terminal device receives Msg2.
  • the terminal device sends Msg3 to the network device.
  • Msg3 includes the uplink data in MsgA.
  • the network device receives Msg3.
  • S48 The network device sends Msg4 to the terminal device.
  • the terminal device receives Msg4.
  • the above steps S45 and S46 may not be executed.
  • the response message of MsgA includes a fallback random access response
  • S47 and S48 are executed.
  • the method provided in the embodiments of the present application is introduced from the perspective of the functions implemented by the terminal device.
  • the terminal device may include a hardware structure and/or a software module, and implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether one of the above-mentioned functions is executed in a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraint conditions of the technical solution.
  • a communication device may include a communication module 701 and a processing module 702, and the communication module 701 and the processing module 702 are coupled with each other.
  • the communication device 700 can be used to execute the steps executed by the terminal device in the above method embodiments.
  • the communication module 701 may be used to support the communication device 700 to communicate.
  • the communication module 701 may have a wired communication function, for example, it can communicate with other network elements in a wired manner.
  • the processing module 702 can be used to support the communication device 700 to perform the processing actions of the terminal device in the foregoing method embodiments, including but not limited to: generating information and messages sent by the communication module 701, and/or performing processing on the signals received by the communication module 701 Demodulation and decoding and so on.
  • the processing module 702 may be used to determine that the downlink measurement value is not lower than the first measurement threshold, and the downlink measurement value is the downlink direction between the terminal device and the network device.
  • the processing module 702 can also be used to select a target carrier from a normal uplink NUL carrier and an auxiliary uplink SUL carrier, the target carrier is configured with a first random access resource, and the first random access resource is used for the For random access of a terminal device, the NUL carrier and the SUL carrier are configured by the network device; the communication module 701 may be used to send random access to the network device through the first random access resource of the target carrier Incoming request, the random access request includes random access preamble code and uplink data.
  • the above downlink measurement value includes one or more of RSRP, RSRQ, or SINR.
  • the communication module 701 may also be used to receive the configuration information of the first random access resource.
  • the configuration information of the first random access resource is used to indicate one or more of the following information: preamble code index; or, time domain and frequency domain resources where the preamble code is located; or, preamble code and synchronization signal block SSB Or, the time domain and frequency domain resources where the physical layer shared channel PUSCH is located; or, the mapping relationship between the time domain and frequency domain resources where the PUSCH is located and the SSB.
  • the processing module 702 may configure the NUL carrier Determined as the target carrier.
  • the processing module 702 may determine the SUL carrier as the target carrier.
  • the NUL carrier is configured with the first random access resource, or the NUL carrier is not configured with the first random access resource.
  • both the NUL carrier and the SUL carrier are configured with the first random access resource, and the second measurement If the value is higher than the first measured value, the processing module 702 may determine the NUL carrier as the target carrier.
  • the communication module 701 may also be used to receive a fallback random access response from the network device; if the target carrier includes the NUL carrier, the communication module 701 may also be used to send data to the network device through the SUL carrier The network device sends the uplink data.
  • the uplink data may be similar to Msg3 in the competitive random access process.
  • the above uplink data is carried in one or more of the following messages: RRC connection establishment request message; or, RRC reestablishment request message; or, RRC connection restoration message; or, system message acquisition request message; or, beam recovery request message, Such as contention-based beam recovery request message.
  • the communication module 701 may also be configured to send the random access preamble to the network device through the SUL carrier in response to the fallback random access response, and receive the random access preamble from the network device The random access response corresponding to the code.
  • the communication module 701 may also be configured to receive a first instruction from the network device, where the first instruction is used to instruct to access the network device in a two-step random access manner.
  • the communication device may include a processor.
  • the steps performed by the above processing module 702 can be executed by a processor.
  • the communication device may include a transceiver, and the transceiver may be used to support the above device to communicate with other devices or devices. Specifically, the transceiver can be used to perform the steps performed by the communication module 701 above.
  • the device may further include a memory, the memory may be used to store a program, and the program may be executed by a processor to perform the steps performed by the above processing module 702.
  • the communication device provided in the embodiment of the present application may also be composed of hardware components, such as a processor, a memory, or a communication interface.
  • the communication device When the communication device is the above second terminal device, its structure may also be as shown in FIG. 8. It is easy to understand and easy to illustrate.
  • a mobile phone is taken as an example to illustrate the structure of the communication device 800.
  • the communication device 800 may include a processor 801, a memory 802, and a transceiver 803.
  • the above processor 801 can be used to process the communication protocol and communication data, control the second terminal device, execute the software program, process the data of the software program, and so on.
  • the memory 802 may be used to store programs and data, and the processor 801 may execute the method executed by the second terminal device in the embodiment of the present application based on the program.
  • the transceiver 803 may include a radio frequency unit and an antenna.
  • the radio frequency unit can be used for conversion of baseband signals and radio frequency signals and processing of radio frequency signals.
  • the antenna can be used to send and receive radio frequency signals in the form of electromagnetic waves.
  • the radio frequency unit can also be regarded as the transceiver 803 only, then the communication device 800 can include a processor 801, a memory 802, a transceiver 803 and an antenna at this time.
  • the communication device 800 may further include an input and output device 804, such as a touch screen, a display screen, or a keyboard, etc., which can be used to receive data input by the user and output data to the user. It should be noted that some types of communication devices may not have input and output devices.
  • the above communication module 701 may have the structure shown in the transceiver 803, that is, including a radio frequency unit and an antenna; or, the communication module 701 may include the above radio frequency unit.
  • the above processing module 702 may include a processor 801, or include a processor 801 and a memory 802.
  • the above communication device 800 may also be composed of a chip.
  • the chip includes a processor 801.
  • the chip may also include a memory 802 and a transceiver 803, wherein the memory 802, the transceiver 803, and the processor 801 can be coupled to each other.
  • the transceiver 803 can be used to execute the steps executed by the communication module 701 described above.
  • the processor 801 calls the program stored in the memory 802 to execute the steps executed by the above processing module 702.
  • the communication device in this embodiment is a terminal device
  • its structure can also refer to the equipment shown in FIG. 9.
  • the device can perform functions similar to the processor 801 in FIG. 8.
  • the device includes a processor 910, a data sending processor 920, and a data receiving processor 930.
  • the processing module 702 in the foregoing embodiment may be the processor 910 in FIG. 9 and performs corresponding functions.
  • the communication module 701 in the foregoing embodiment may be the sending data processor 920 and/or the receiving data processor 930 in FIG. 9.
  • a channel encoder and a channel decoder are shown in FIG. 9, it can be understood that these modules do not constitute a restrictive description of this embodiment, and are only illustrative.
  • the processing device 1000 may include modules such as a modulation subsystem, a central processing subsystem, and a peripheral subsystem.
  • the communication device in this embodiment can be used as a modulation subsystem therein.
  • the modulation subsystem may include a processor 1003 and an interface 1004.
  • the processor 1003 completes the function of the aforementioned processing module 702, and the interface 1004 completes the function of the aforementioned communication module 701.
  • the modulation subsystem includes a memory 1006, a processor 1003, and a program stored on the memory 1006 and running on the processor.
  • the processor 1003 implements the method of the processing module 702 when the program is executed.
  • the memory 1006 may be non-volatile or volatile, and its location may be located inside the modulation subsystem or in the processing device 1000, as long as the memory 1006 can be connected to the The processor 1003 is fine.
  • a communication device may include a communication module 1101 and a processing module 1102, and the communication module 1101 and the processing module 1102 are mutually coupled.
  • the communication device 1100 can be used to execute the steps executed by the terminal device in the above method embodiments.
  • the communication module 1101 may be used to support the communication device 1100 to communicate.
  • the communication module 1101 may have a wired communication function, such as being able to communicate with other network elements in a wired manner.
  • the processing module 1102 can be used to support the communication device 1100 to perform the processing actions of the terminal device in the above method embodiments, including but not limited to: generating information and messages sent by the communication module 1101, and/or performing processing on the signals received by the communication module 1101 Demodulation and decoding and so on.
  • the communication module 1101 may be configured to receive a random access request from the terminal device through the first random access resource of the target carrier, the random access request including a preamble code And uplink data, the target carrier includes the NUL carrier or the SUL carrier of the terminal device; the communication module 1101 may also be configured to send a random access response corresponding to the random access request to the terminal device.
  • the communication module 1101 may also send configuration information of the first random access resource to the terminal device.
  • the configuration information of the first random access resource is used to indicate one or more of the following information: preamble code index; or, the time domain and frequency domain resources where the preamble code is located; or, the preamble code and SSB Mapping relationship; or, time domain and frequency domain resources where PUSCH is located; or, mapping relationship between time domain and frequency domain resources where PUSCH is located and SSB.
  • the communication module 1101 may also be configured to receive the uplink data from the terminal device through the SUL carrier.
  • the above uplink data is carried in one or more of the following messages: RRC connection establishment request message; or, RRC reestablishment request message; or, RRC connection restoration message; or, system message acquisition request message; or, beam recovery request message, Such as contention-based beam recovery request message.
  • the communication module 1101 may also be configured to receive the random access preamble from the terminal device through the SUL carrier, and send a random access response corresponding to the random access preamble to the terminal device.
  • the communication module 1101 may also send a first instruction to the terminal device, where the first instruction is used to instruct to access the network device in a two-step random access manner.
  • the communication device may include a processor.
  • the steps performed by the above processing module 1102 can be executed by a processor.
  • the communication device may include a transceiver, and the transceiver may be used to support the above device to communicate with other devices or devices. Specifically, the transceiver can be used to perform the steps performed by the communication module 1101 above.
  • the device may also include a memory, which may be used to store a program, and the program may be executed by a processor to perform the steps performed by the above processing module 1102.
  • the communication device in this embodiment when the communication device in this embodiment is a network device, the communication device may have a structure as shown in FIG. 12.
  • the communication device 1200 includes one or more radio frequency units, such as a remote radio unit (RRU) 1210 and one or more baseband units (BBU) (also referred to as digital units, digital units, DU) 1220.
  • RRU 1210 may be referred to as a communication module, which corresponds to the communication module 1101 in FIG. 11, and is used to execute the steps performed by the communication module 1101 above.
  • the RRU 1210 may also be called a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna and a radio frequency unit.
  • the RRU 1210 part is mainly used for sending and receiving of radio frequency signals and conversion of radio frequency signals and baseband signals, for example, for sending resource indications to terminal equipment.
  • the 1220 part of the BBU is mainly used for baseband processing and control of the base station.
  • the RRU 1210 and the BBU 1220 may be physically set together, or may be physically separated, that is, a distributed base station.
  • the BBU 1220 is the control center of the base station, which may also be referred to as a processing module, which may correspond to the processing module 1102 in FIG.
  • the BBU 1220 can also be used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading.
  • the BBU 1220 may be used to control the network device to execute the operation process of the network device in the foregoing method embodiment, for example, to generate an RRC message and first information.
  • the BBU 1220 may be composed of one or more single boards, and multiple single boards may jointly support a radio access network (such as an LTE network) of a single access standard, or support different access standards. Wireless access network (such as LTE network, 5G network or other networks).
  • the BBU 1220 also includes a memory 1221 and a processor 1222.
  • the memory 1221 is used to store necessary instructions and data.
  • the processor 1222 is used to control the network device to perform necessary actions, for example, to control the network device to execute the operation procedure executed by the CU and/or the CU in the foregoing method embodiment. Exemplarily, the above steps executed by the processing module 1102 may be executed by the processor 1222.
  • the memory 1221 and the processor 1222 may serve one or more single boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.
  • the embodiment of the application also provides a computer-readable storage medium on which a computer program is stored.
  • the program When the program is executed by a processor, the computer executes the above method embodiment and method implementation. Examples of operations performed by terminal devices or network devices in any possible implementation manner.
  • the present application also provides a computer program product, which when invoked and executed by a computer, enables the computer to implement the above method embodiment and any possible implementation of the method embodiment The operation performed by the terminal device or network device.
  • the present application also provides a chip or chip system, and the chip may include a processor.
  • the chip may also include a memory (or storage module) and/or a transceiver (or communication module), or the chip may be coupled with a memory (or storage module) and/or a transceiver (or communication module), wherein the transceiver ( (Or communication module) can be used to support the chip for wired and/or wireless communication, the memory (or storage module) can be used to store a program, and the processor can call the program to implement any one of the above method embodiments and method embodiments.
  • the chip system may include the above chips, and may also include the above chips and other discrete devices, such as a memory (or storage module) and/or a transceiver (or communication module).
  • this application also provides a communication system, which may include the above terminal equipment and/or network equipment.
  • the communication system may be used to implement operations performed by a terminal device or a network device in any possible implementation manner of the foregoing method embodiment and method embodiment.
  • the communication system has a structure as shown in FIG. 4.
  • These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device.
  • the device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps for implementing functions specified in a flow or multiple flows in the flowchart and/or a block or multiple blocks in the block diagram.

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Abstract

La présente invention concerne un procédé et un appareil d'accès aléatoire. Selon le procédé, lorsqu'une valeur de mesure de liaison descendante d'un appareil terminal n'est pas inférieure à un premier seuil de mesure, l'appareil terminal peut sélectionner, à partir d'une porteuse NUL et d'une porteuse SUL, une porteuse cible configurée avec une première ressource d'accès aléatoire, et initie un accès aléatoire en deux étapes au moyen de la porteuse cible. Le taux de réussite d'accès aléatoire en deux étapes peut être amélioré étant donné que l'accès aléatoire en deux étapes n'est plus uniquement initié au moyen d'une porteuse NUL.
PCT/CN2020/094964 2019-06-14 2020-06-08 Procédé et appareil d'accès aléatoire WO2020248944A1 (fr)

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