WO2020191515A1 - Procédé et appareil d'accès aléatoire, terminal et dispositif de réseau - Google Patents

Procédé et appareil d'accès aléatoire, terminal et dispositif de réseau Download PDF

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Publication number
WO2020191515A1
WO2020191515A1 PCT/CN2019/079205 CN2019079205W WO2020191515A1 WO 2020191515 A1 WO2020191515 A1 WO 2020191515A1 CN 2019079205 W CN2019079205 W CN 2019079205W WO 2020191515 A1 WO2020191515 A1 WO 2020191515A1
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WIPO (PCT)
Prior art keywords
random access
value
information
terminal
access response
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PCT/CN2019/079205
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English (en)
Chinese (zh)
Inventor
王淑坤
石聪
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Oppo广东移动通信有限公司
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Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to PCT/CN2019/079205 priority Critical patent/WO2020191515A1/fr
Priority to CN201980082724.6A priority patent/CN113170514B/zh
Publication of WO2020191515A1 publication Critical patent/WO2020191515A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]

Definitions

  • the embodiments of the present application relate to the field of mobile communication technology, and in particular to a random access method and device, terminal, and network equipment.
  • a window is opened, and the terminal detects a random access response (Random Access Response, RAR) in this window.
  • RAR Random Access Response
  • the maximum window of RAR is 10ms.
  • PRACH Physical Random Access Channel
  • the embodiments of the application provide a random access method and device, terminal, and network equipment.
  • the terminal receives a first random access response in a first window, where the first random access response carries first information, and the first information is used to indicate a random access channel associated with the first random access response.
  • the base station sends at least one random access response in the first window; wherein the random access response carries first information, and the first information is used to indicate a random access channel associated with the random access response.
  • the receiving unit is configured to receive a first random access response in a first window, where the first random access response carries first information, and the first information is used to indicate the random access associated with the first random access response Into the channel.
  • the sending unit is configured to send at least one random access response in the first window; wherein the random access response carries first information, and the first information is used to indicate a random access channel associated with the random access response.
  • the terminal provided in the embodiment of the present application includes a processor and a memory.
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program stored in the memory to execute the aforementioned random access method.
  • the network device provided by the embodiment of the present application includes a processor and a memory.
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program stored in the memory to execute the aforementioned random access method.
  • the chip provided in the embodiment of the present application is used to implement the aforementioned random access method.
  • the chip includes: a processor, configured to call and run a computer program from the memory, so that the device installed with the chip executes the random access method described above.
  • the computer-readable storage medium provided by the embodiment of the present application is used to store a computer program, and the computer program enables a computer to execute the random access method described above.
  • the computer program product provided by the embodiment of the present application includes computer program instructions, and the computer program instructions cause the computer to execute the random access method described above.
  • the computer program provided in the embodiment of the present application when it runs on a computer, causes the computer to execute the above-mentioned random access method.
  • the random access response carries indication information for indicating the random access channel associated with the random access response, so that the terminal can determine whether the random access response received by itself is its own random access response , Which reduces the probability of random access collisions.
  • the length of the random access response window can be extended, thereby increasing the probability of the terminal successfully receiving the random access response.
  • FIG. 1 is a schematic diagram of a communication system architecture provided by an embodiment of this application.
  • Figure 2 is a flowchart of a competitive random access process provided by an embodiment of the application
  • FIG. 3 is a schematic flow chart 1 of a random access method provided by an embodiment of the application.
  • Figure 4-1 is a structural diagram of MAC PDU provided by an embodiment of this application.
  • Figure 4-2 is a structural diagram of the E/T/R/R/BI subheader provided by an embodiment of this application;
  • FIG. 4-3 is a structural diagram of the E/T/RAPID subheader provided by an embodiment of this application.
  • FIG. 4-4 is a structural diagram of MAC RAR provided by an embodiment of this application.
  • Figure 5 is a diagram of an application example provided by an embodiment of the application.
  • FIG. 6 is a schematic diagram 1 of the structural composition of a random access device provided by an embodiment of this application.
  • FIG. 7 is a second schematic diagram of the structural composition of a random access device provided by an embodiment of this application.
  • FIG. 8 is a schematic structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 9 is a schematic structural diagram of a chip according to an embodiment of the application.
  • FIG. 10 is a schematic block diagram of a communication system provided by an embodiment of this application.
  • GSM Global System of Mobile Communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GSM Global System of Mobile Communication
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • the communication system 100 applied in the embodiment of the present application is shown in FIG. 1.
  • the communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal 120 (or called a communication terminal or a terminal).
  • the network device 110 may provide communication coverage for a specific geographic area, and may communicate with terminals located in the coverage area.
  • the network device 110 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, a base station (NodeB, NB) in a WCDMA system, or an evolved base station in an LTE system (Evolutional Node B, eNB or eNodeB), or the wireless controller in the Cloud Radio Access Network (CRAN), or the network equipment can be a mobile switching center, a relay station, an access point, a vehicle-mounted device, Wearable devices, hubs, switches, bridges, routers, network-side devices in 5G networks, or network devices in the future evolution of the Public Land Mobile Network (PLMN), etc.
  • BTS Base Transceiver Station
  • NodeB, NB base station
  • LTE Long Term Evolutional Node B
  • eNB evolved base station
  • CRAN Cloud Radio Access Network
  • the network equipment can be a mobile switching center, a relay station, an access point, a vehicle-mounted device, Wearable devices, hubs, switches
  • the communication system 100 also includes at least one terminal 120 located within the coverage area of the network device 110.
  • the "terminal” used here includes, but is not limited to, connection via wired lines, such as public switched telephone networks (PSTN), digital subscriber lines (Digital Subscriber Line, DSL), digital cables, and direct cable connections; And/or another data connection/network; and/or via a wireless interface, such as for cellular networks, wireless local area networks (WLAN), digital TV networks such as DVB-H networks, satellite networks, AM-FM Broadcast transmitter; and/or another terminal's device configured to receive/send communication signals; and/or Internet of Things (IoT) equipment.
  • a terminal set to communicate through a wireless interface may be referred to as a "wireless communication terminal", a “wireless terminal” or a “mobile terminal”.
  • mobile terminals include, but are not limited to, satellites or cellular phones; Personal Communications System (PCS) terminals that can combine cellular radio phones with data processing, fax, and data communication capabilities; can include radio phones, pagers, Internet/intranet PDA with internet access, web browser, memo pad, calendar, and/or Global Positioning System (GPS) receiver; and conventional laptop and/or palmtop receivers or others including radio phone transceivers Electronic device.
  • PCS Personal Communications System
  • GPS Global Positioning System
  • Terminal can refer to access terminal, user equipment (User Equipment, UE), user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or user Device.
  • the access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital processing (Personal Digital Assistant, PDA), with wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminals in 5G networks, or terminals in the future evolution of PLMN, etc.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • the terminals 120 may perform device-to-device (D2D) communication.
  • D2D device-to-device
  • the 5G system or 5G network may also be referred to as a New Radio (NR) system or NR network.
  • NR New Radio
  • FIG. 1 exemplarily shows one network device and two terminals.
  • the communication system 100 may include multiple network devices and the coverage of each network device may include other numbers of terminals. This embodiment of the present application There is no restriction on this.
  • the communication system 100 may also include other network entities such as a network controller and a mobility management entity, which are not limited in the embodiment of the present application.
  • network entities such as a network controller and a mobility management entity, which are not limited in the embodiment of the present application.
  • the devices with communication functions in the network/system in the embodiments of the present application may be referred to as communication devices.
  • the communication device may include a network device 110 and a terminal 120 with communication functions, and the network device 110 and the terminal 120 may be the specific devices described above, which will not be repeated here;
  • the device may also include other devices in the communication system 100, such as other network entities such as a network controller and a mobility management entity, which are not limited in the embodiment of the present application.
  • NR works in unlicensed frequency bands, including the following work scenarios:
  • Carrier aggregation scenario The primary cell (Primary Cell, PCell) is a licensed spectrum, and the secondary cells (SCell) working on the unlicensed spectrum are aggregated through carrier aggregation.
  • Primary Cell Primary Cell
  • SCell secondary cells
  • PCell is an LTE licensed spectrum
  • primary and secondary cell Primary Secondary cell, PScell
  • PScell Primary Secondary cell
  • NR works as an independent cell in an unlicensed spectrum.
  • NR-U New Radio Unlicensed
  • 5GHz unlicensed spectrum and 6GHz unlicensed spectrum on unlicensed spectrum, NR-U design should ensure that Fairness between systems working on these unlicensed spectrum.
  • the principle of fairness is that the impact of NR-U on systems that have been deployed on unlicensed spectrum cannot exceed the impact between these systems.
  • the general energy detection mechanism is the Listen Before Talk (LBT) mechanism.
  • LBT Listen Before Talk
  • the basic principle of this mechanism is that the base station or terminal (transmitting end) needs to listen for a period of time before transmitting data on the unlicensed spectrum. . If the result of the listening indicates that the channel is idle, the transmitting end can transmit data to the receiving end. If the listening result indicates that the channel is in an occupied state, the transmitting end needs to back off for a period of time according to regulations before continuing to listen to the channel, knowing that the channel listening result is in an idle state, before transmitting data to the receiving end.
  • LBT Listen Before Talk
  • the base station For downlink data transmission, the base station needs to perform LBT on the unlicensed frequency band; in LAA, the priority of channel access is determined by the following Table 1:
  • Mp is related to the listening channel time for channel access.
  • CWmin, p and CWmax, p are related to the random listening channel time during channel access. Specifically, when the base station listens to the channel for Td time and is idle, it needs to listen to the channel again N times, each with a duration of 9 us. Where N is a random number from 0 to CWp, and CW min,p ⁇ CW p ⁇ CW max,p .
  • Tmcot p is the longest time for the base station to occupy the channel after it has seized the channel. It is related to the channel priority adopted by the base station. For example, if the priority is 1, the channel will be occupied for 2ms at most after the channel is successfully monitored.
  • the base station needs to transmit data to the UE within the MCOT time. If the base station does not seize the channel, that is, outside the MCOT time, the UE will not receive the scheduling data from the base station to the UE.
  • Random access is an important process for the UE to establish a wireless connection with the network side. Through random access, it can obtain uplink synchronization with the base station and apply for uplink resources.
  • the random access process is divided into competitive random access and non-competitive random access.
  • Figure 2 shows the flow of a competitive random access process. As shown in Figure 2, the competitive random access process includes the following steps:
  • Step 201 The terminal sends msg1 to the base station.
  • the terminal sending msg1 to the base station can be specifically implemented through the following process:
  • the terminal determines the relationship between the synchronization signal block (Synchronization Signal Block, SSB) and the PRACH resource (configured by the higher layer);
  • SSB Synchronization Signal Block
  • the terminal receives a set of SSBs and determines its Reference Signal Received Power (RSRP) value, and selects the appropriate SSB according to the threshold;
  • RSRP Reference Signal Received Power
  • the terminal determines the PRACH resource based on the selected SSB and the corresponding relationship between the SSB and the RACH resource;
  • the terminal selects the preamble group according to the size of msg3, and further selects the preamble;
  • the terminal sets the target received power of the preamble
  • the terminal sends the preamble on the PRACH time-frequency domain resources.
  • Step 202 The terminal receives msg2 sent by the base station.
  • the terminal receiving the msg2 sent by the base station can be specifically implemented through the following process:
  • the terminal determines the random access radio network temporary identifier (RA-RNTI) according to the time-frequency domain resources of the PRACH sent by msg1;
  • RA-RNTI random access radio network temporary identifier
  • the terminal starts the RAR window (ra-Response Window) at the first physical downlink control channel (Physical Downlink Control Channel, PDCCH) after the preamble is sent, and monitors the PDCCH during the operation of the window to receive the corresponding RA -RNTI's RAR;
  • RAR window (ra-Response Window) at the first physical downlink control channel (Physical Downlink Control Channel, PDCCH) after the preamble is sent, and monitors the PDCCH during the operation of the window to receive the corresponding RA -RNTI's RAR;
  • PDCCH Physical Downlink Control Channel
  • the terminal will retransmit msg1;
  • the terminal transmits msg3 according to the RAR's instructions.
  • Step 203 The terminal sends msg3 to the base station.
  • the terminal sending msg3 to the base station can be specifically implemented through the following process:
  • the terminal transmits msg3 based on the uplink scheduling (UL Grant) in RAR;
  • start ra-ContentionResolutionTimer After Msg3 is transmitted, start ra-ContentionResolutionTimer and monitor the PDCCH during the running of the timer; when Msg3 retransmits, restart the timer; until the timer expires or stops, the terminal will always monitor the PDCCH.
  • Step 204 The terminal receives msg4 sent by the base station.
  • the terminal receives the DCI format 1_0 of the Cell-Radio Network Temporary Identifier (C-RNTI) scrambling code and its corresponding PDSCH, random access is complete; if the terminal receives the temporary cell radio network temporary identifier (Temporary Cell-Radio Network Temporary Identifier, TC-RNTI) scrambling DCI format 1_0 and its corresponding PDSCH, and the content is successfully compared, and random access is completed.
  • C-RNTI Cell-Radio Network Temporary Identifier
  • Fig. 3 is a schematic diagram 1 of the flow of the random access method provided by an embodiment of the application. As shown in Fig. 3, the random access method includes the following steps:
  • Step 301 The base station sends at least one random access response in the first window; wherein the random access response carries first information, and the first information is used to indicate the random access channel associated with the random access response.
  • the technical solutions of the embodiments of the present application can be applied to any type of random access process, such as a competitive random access process (as shown in FIG. 2) or a non-competitive random access process.
  • a competitive random access process as shown in FIG. 2
  • a non-competitive random access process does not need to resolve the random access conflict (the network side is pre-configured with random access resources without conflict). Therefore, the non-competitive random access process
  • the incoming process only includes two steps: msg1 transmission and mgs2 transmission. Among them, msg1 transmission refers to the terminal sending a preamble on the PRACH, and msg2 transmission refers to the base station sending RAR.
  • the base stations mentioned in the embodiments of this application include but are not limited to LTE base stations (eNB) and NR base stations (gNB.)
  • the terminal mentioned in the embodiments of this application may be any device capable of communicating with the network, such as a mobile phone, a notebook, a tablet computer, a vehicle-mounted terminal, and a wearable terminal.
  • the first window refers to the RAR window for detecting random access responses.
  • the length of the first window is between 10 ms and 20 ms. It should be noted that if the first window is less than 10ms, the RA-RNTI calculated based on the PRACH resource does not have repetitions; if the first window is greater than 10ms, the RA-RNTI calculated based on the PRACH resource has repetitions.
  • the base station before the base station sends at least one random access response in the first window, the base station further includes the following steps: the base station receives the preamble sent by the first terminal on the first random access channel, and receives The preamble sent on the second random access channel; the base station calculates the first RA-RNTI based on the resources of the first random access channel, and calculates the second RA-RNTI based on the resources of the second random access channel .
  • the base station When the first RA-RNTI and the second RA-RNTI are the same, the base station multiplexes the first random access response of the first terminal and the second random access response of the terminal in MAC PDU; wherein, the first information carried in the first random access response is used to indicate that the first random access response is associated with the first random access channel, and the second random access response The first information carried is used to indicate that the second random access response is associated with the second random access channel.
  • the transmission time of the first random access channel is earlier than the transmission time of the second random access channel
  • the transmission time of the second random access channel is earlier than the transmission time of the MAC PDU.
  • the transmission time of the first random access channel is farther from the transmission time of the MAC PDU than the transmission time of the second random access channel.
  • UE1 sends a preamble on PRACH-1 (assumed to correspond to time t1)
  • UE2 sends a preamble on PRACH-2 (assumed to correspond to time t2)
  • the base station successfully seizes the channel at time t3.
  • the time t1 is within 10ms of the window
  • the time t2 corresponding to PRACH-2 is 10ms outside the window.
  • the RA-RNTI of PRACH-1 and the RA-RNTI of PRACH-2 may be the same.
  • the base station will multiplex the RAR1 of UE1 and RAR2 of UE2 in the same MAC PDU for transmission, that is, send msg2.
  • the first information carried by RAR1 is used to indicate that RAR1 is associated with PRACH-1
  • the first information carried by RAR2 is used to indicate that RAR2 is associated with PRACH-2.
  • the first subheader in the MAC PDU includes back-off indication information and second information, and the second information is used to indicate the random access channel associated with the back-off indication information.
  • the MAC PDU is the MAC PDU of the RAR sent by the network device.
  • the data format of the RAR MAC PDU is shown in Figure 4-1.
  • the MAC PDU includes multiple MAC subPDUs (MAC subPDU), namely MAC subPDU1, MAC subPDU2, MAC subPDU3 and so on.
  • MAC subPDU1 includes backoff indication (Backoff Indication, BI)
  • MAC subPDU1 includes E/T/R/R/BI subheader (this application is recorded as the first subheader), E/T/R/R/BI subheader
  • BI Backoff Indication
  • MAC subPDU2 includes Random Access preamble ID (RAPID), MAC subPDU2 includes E/T/RAPID subheader (this application is referred to as the second subheader), the structure of E/T/RAPID subheader is shown in Figure 4 3 shown.
  • the remaining MAC subPDUs include RAPID and RAR. Take MAC subPDU3 as an example.
  • MAC subPDU3 includes E/T/RAPID subheader and MAC RAR.
  • the structure of E/T/RAPID subheader is shown in Figure 4-3.
  • MAC RAR The structure is shown in Figure 4-4. The description of each information in Figure 4-2 to Figure 4-4 is as follows:
  • fallback indication information used for the terminal to perform random access fallback according to the fallback indication information.
  • RAPID The preamble index (preamble index) obtained by the base station when detecting the preamble, namely RAPID.
  • R stands for reserved bit area.
  • TAC Timing Advance Command, which carries the TA value used to notify the terminal to perform uplink synchronization.
  • Uplink Grant used to indicate resources for uplink transmission of Msg3.
  • TC-RNTI used for the terminal to subsequently scramble the sent Msg3 message.
  • the R bit in the MAC RAR shown in FIG. 4-4 is used to carry first information, and the first information is used to indicate the random access channel associated with the first random access response.
  • the value of the first information carried in the first random access response is a second value, and the second value is used to indicate that the first random access response is associated with the first random access channel
  • the value of the first information carried in the second random access response is a first value, and the first value is used to indicate that the second random access response is associated with the second random access channel.
  • the first value and the second value are represented by the value range ⁇ 1,0 ⁇ of the R bit. In an example, the first value is 0 and the second value is 1, and vice versa.
  • the R bit in the E/T/R/R/BI subheader (denoted as the first subheader in this application) shown in Figure 4-2 is used to carry the second information, and the second information is used for Indicate the random access channel associated with the fallback indication information.
  • one of the R bits of the E/T/R/R/BI subheader may be used to carry the second information, the value of the second information is the second value, and the first A two value is used to indicate that the backoff indication information is associated with the first random access channel; or, the value of the second information is a first value, and the first value is used to indicate the backoff indication information Associate the second random access channel.
  • the first value and the second value are represented by the value range ⁇ 1,0 ⁇ of the R bit. In an example, the first value is 0 and the second value is 1, and vice versa.
  • two R bits of the E/T/R/R/BI subheader may be used to carry the second information, the value of the second information is the second value, and the second value Is used to indicate that the backoff indication information is associated with the first random access channel; or, the value of the second information is a first value, and the first value is used to indicate that the backoff indication information is associated with the first random access channel; The second random access channel; or, the value of the second information is a third value, and the third value is used to indicate that the backoff indication information is associated with the first random access channel and the first random access channel 2. Random access channel; or, the value of the second information is a fourth value, and the fourth value is reserved information.
  • the first value, the second value, the third value, and the fourth value are represented by the value range ⁇ 00, 01, 11, 10 ⁇ of the R bit.
  • the first value is 00
  • the second value is 01
  • the third value is 10
  • the fourth value is 11.
  • Other values are also possible.
  • the base station sends the MAC PDU after successfully seizing the channel in the first window of the first terminal; in addition, after the base station fails to seize the channel in the first window of the first terminal, Suspend the first random access response of the first terminal.
  • Step 302 The terminal receives a first random access response in a first window, where the first random access response carries first information, and the first information is used to indicate the random access associated with the first random access response channel.
  • the terminal receiving the first random access response in the first window is specifically implemented in the following manner:
  • the terminal detects the MAC PDU in the first window, and obtains the first random access response corresponding to the first preamble identifier from the MAC PDU, where the first preamble identifier is the preamble sent by the terminal ID of the code. Further, the terminal obtains a first subheader from the MAC PDU, the first subheader includes backoff indication information and second information, and the second information is used to indicate the random number associated with the backoff indication information. Access channel.
  • the length of the first window is greater than 10 ms.
  • the first window can be divided into two ranges, a first time range and a second time range.
  • the first time range of the first window refers to the first time range.
  • the second time range of the first window refers to a time range other than the first 10 ms of the first window.
  • the first value is 0 and the second value is 1, and vice versa.
  • the first processing method (using one of the R bits of the E/T/R/R/BI subheader to carry the second information): if the value of the second information is the first value, the terminal Perform random access fallback according to the fallback indication information; if the value of the second information is the second value, the terminal does not perform random access fallback.
  • the first value is 0 and the second value is 1, and vice versa.
  • the second processing method (using two R bits of the E/T/R/R/BI subheader to carry the second information): if the value of the second information is the first value or the third value, The terminal performs random access fallback according to the fallback indication information; if the value of the second information is the second value or the fourth value, the terminal does not perform random access fallback.
  • the first value is 00
  • the second value is 01
  • the third value is 10
  • the fourth value is 11.
  • Other values are also possible.
  • the first value is 0 and the second value is 1, and vice versa.
  • the first processing method (using one of the R bits of the E/T/R/R/BI subheader to carry the second information): if the value of the second information is the second value, the terminal Perform random access fallback according to the fallback indication information; if the value of the second information is the first value, the terminal does not perform random access fallback.
  • the first value is 0 and the second value is 1, and vice versa.
  • the second processing method (using two R bits of the E/T/R/R/BI subheader to carry the second information): if the value of the second information is the second value or the third value, The terminal performs random access fallback according to the fallback indication information; if the value of the second information is the first value or the fourth value, the terminal does not perform random access fallback.
  • the first value is 00
  • the second value is 01
  • the third value is 10
  • the fourth value is 11.
  • Other values are also possible.
  • the maximum window length of RAR is 20ms, and the window length of RAR configured for UE1 in Figure 5 is 20ms.
  • UE1 sends msg1 (ie preamble) on PRACH-1, the RA-RNTI calculated based on PRACH-1 resources is a;
  • UE2 sends msg1 (ie preamble) on PRACH-2, and RA-RNTI calculated based on PRACH-2 resources is a.
  • msg2 contains RARs of different PRACH resources corresponding to the same RA-RNTI, where RAR1 represents the RAR associated with PRACH-1, and RAR2 represents the RAR associated with PRACH-2.
  • the base station carries first information through R bits of RAR1 and RAR2, and the first information is used to indicate the random access channel associated with the first random access response.
  • the value of the R bit is 1 indicates that the corresponding RAR is the feedback of the preamble detected by the PRACH-1 corresponding to the RA-RNTI
  • the value of the R bit is 0 indicates that the corresponding RAR is the preamble detected by the PRACH-2 corresponding to the RA-RNTI. feedback of.
  • the base station will also set the E/T/R/R/BI subheader of the MAC PDU.
  • the R bit in the E/T/R/R/BI subheader carries the second information, and the second information is used to indicate the The random access channel associated with the fallback indication information, that is, the second information is used to set whether the BI is a fallback for the PRACH-1 resource corresponding to the same RA-RNTI or the fallback for the PRACH-2 resource. For example: use one of the R bits of E/T/R/R/BI subheader to indicate the fallback indication of one of the PRACH resources.
  • the opposite is also possible.
  • the base station For UE1, if the base station does not grab a channel within the RAR window of UE1, the base station discards the RAR of UE1. The RAR of UE2 is not sent, and the transmission of RAR of UE2 is suspended.
  • the UE receives msg2 (that is, the MAC PDU of the RAR), obtains the RAR corresponding to the RAPID of the preamble sent by the UE, and then determines whether the RAR is a response to the RAR based on the value of the R bit in the RAR. If the UE receives the RAR within 10ms, the UE first looks for the RAPID corresponding to the RAPID in the MAC PDU according to the RAPID sent by the preamble, and if so, further judges the R bit in the RAR. If the R bit is set to 0, the corresponding RAR is considered to be its own RAR, otherwise the RAR is discarded.
  • msg2 that is, the MAC PDU of the RAR
  • the UE If the RAR corresponding to the RAPID is not found, it is considered that there is no RAR of its own. If the UE receives the RAR in a time greater than 10ms, the UE first searches the MAC PDU according to the RAPID corresponding to the preamble sent by the UE to see if there is a RAR corresponding to the RAPID in the MAC PDU. If it exists, then further judge the R bit in the RAR. If the R bit is set If it is 1, it is considered that the corresponding RAR is its own RAR, otherwise the RAR is discarded. If the RAR corresponding to the RAPID is not found, it is considered that there is no RAR of its own.
  • the UE will determine whether to perform random access fallback. For the case where one R bit in the E/T/R/R/BI subheader indicates the fallback indication of one of the PRACH resources, if the UE receives RAR within 10ms, if the R bit is set to 0, the UE executes according to BI Random access rollback, otherwise it will not be executed. If the UE receives the RAR in a time greater than 10ms, if the R bit is set to 1, the UE performs random access fallback according to the BI, otherwise it does not perform it.
  • the UE receives RAR within 10ms, if the two R bits are set to 00 Or 10, the UE executes random access fallback according to BI, otherwise it does not execute. If the UE receives the RAR in a time greater than 10 ms, if the two R bits are set to 01 or 10, the UE performs random access fallback according to the BI, otherwise it does not perform it.
  • the UE finds its own RAR, the UE sends msg3 according to the scheduling of the RAR; if the UE does not find the RAR, it detects BI to determine whether to perform random access fallback, and initiates random access again.
  • the technical solution of the embodiment of this application expands the window length of the RAR, and indicates the PRACH associated with the RAR through the R bit in the MAC RAR, and at the same time, through one or two R bits in the E/T/R/R/BI subheader Indicates the PRACH associated with the BI.
  • FIG. 6 is a schematic diagram 1 of the structural composition of a random access device provided by an embodiment of this application. As shown in FIG. 6, the random access device includes:
  • the receiving unit 601 is configured to receive a first random access response in a first window, where the first random access response carries first information, and the first information is used to indicate the random access associated with the first random access response. Access channel.
  • the receiving unit 601 is configured to detect a MAC PDU in the first window, and obtain a first random access response corresponding to a first preamble identifier from the MAC PDU, wherein the first random access response is A preamble identifier is the identifier of the preamble sent by the terminal.
  • the device further includes a processing unit 602; when the receiving unit 601 detects the MAC PDU in the first time range of the first window:
  • the processing unit 602 determines that the first random access response is a response to the random access response of the terminal;
  • the processing unit 602 discards the first random access response.
  • the device further includes a processing unit 602; when the receiving unit 601 detects the MAC PDU in the second time range of the first window:
  • the processing unit 602 determines that the first random access response is a response to the random access response of the terminal;
  • the processing unit 602 discards the first random access response.
  • the receiving unit 601 is further configured to obtain a first subheader from the MAC PDU, where the first subheader includes backoff indication information and second information, and the second information is used for Indicate the random access channel associated with the fallback indication information.
  • the device further includes a processing unit 602; when the receiving unit 601 detects the MAC PDU in the first time range of the first window:
  • the processing unit 602 performs random access fallback according to the fallback indication information
  • the processing unit 602 does not perform random access fallback.
  • the device further includes a processing unit 602; when the receiving unit 601 detects the MAC PDU in the second time range of the first window:
  • the processing unit 602 performs random access fallback according to the fallback indication information
  • the processing unit 602 does not perform random access fallback.
  • the device further includes a processing unit 602; when the receiving unit 601 detects the MAC PDU in the first time range of the first window:
  • the processing unit 602 performs random access fallback according to the fallback indication information
  • the processing unit 602 does not perform random access fallback.
  • the device further includes a processing unit 602; when the receiving unit 601 detects the MAC PDU in the second time range of the first window:
  • the processing unit 602 performs random access fallback according to the fallback indication information
  • the processing unit 602 does not perform random access fallback.
  • the first time range of the first window refers to a time range within the first 10 ms of the first window.
  • the second time range of the first window refers to a time range other than the first 10 ms of the first window.
  • FIG. 7 is a second schematic diagram of the structural composition of the random access device provided by an embodiment of the application. As shown in FIG. 7, the random access device includes:
  • the sending unit 701 is configured to send at least one random access response in a first window; wherein the random access response carries first information, and the first information is used to indicate the random access channel associated with the random access response .
  • the device further includes:
  • the receiving unit 702 is configured to receive the preamble sent by the first terminal on the first random access channel, and receive the preamble sent by the second terminal on the second random access channel;
  • the processing unit 703 is configured to calculate a first RA-RNTI based on the resources of the first random access channel, and calculate a second RA-RNTI based on the resources of the second random access channel;
  • the sending unit 701 is configured to connect the first random access response of the first terminal with the second random access response of the terminal when the first RA-RNTI and the second RA-RNTI are the same.
  • the incoming response is multiplexed in the MAC PDU for transmission; wherein the first information carried in the first random access response is used to indicate that the first random access response is associated with the first random access channel, so The first information carried in the second random access response is used to indicate that the second random access response is associated with the second random access channel; wherein, the transmission time of the first random access channel is earlier than the The transmission time of the second random access channel, the transmission time of the second random access channel is earlier than the transmission time of the MAC PDU.
  • the value of the first information carried in the first random access response is a second value, and the second value is used to indicate that the first random access response is associated with the first random access response.
  • the value of the first information carried in the second random access response is a first value, and the first value is used to indicate that the second random access response is associated with the second random access channel.
  • the first subheader in the MAC PDU includes back-off indication information and second information, and the second information is used to indicate the random access channel associated with the back-off indication information.
  • the value of the second information is a second value, and the second value is used to indicate that the backoff indication information is associated with the first random access channel; or,
  • the value of the second information is a first value, and the first value is used to indicate that the backoff indication information is associated with the second random access channel.
  • the value of the second information is a second value, and the second value is used to indicate that the backoff indication information is associated with the first random access channel; or,
  • the value of the second information is a first value, and the first value is used to indicate that the backoff indication information is associated with the second random access channel; or,
  • the value of the second information is a third value, and the third value is used to indicate that the backoff indication information is associated with the first random access channel and the second random access channel; or,
  • the value of the second information is a fourth value, and the fourth value is reserved information.
  • the sending unit 701 is configured to send the MAC PDU after successfully seizing the channel in the first window of the first terminal; the device further includes:
  • the processing unit is configured to suspend the first random access response of the first terminal after the channel preemption fails in the first window of the first terminal.
  • FIG. 8 is a schematic structural diagram of a communication device 600 provided by an embodiment of the present application.
  • the communication device may be a terminal or a network device.
  • the communication device 600 shown in FIG. 8 includes a processor 610, and the processor 610 can call and run a computer program from a memory to implement the method in the embodiment of the present application.
  • the communication device 600 may further include a memory 620.
  • the processor 610 may call and run a computer program from the memory 620 to implement the method in the embodiment of the present application.
  • the memory 620 may be a separate device independent of the processor 610, or may be integrated in the processor 610.
  • the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices. Specifically, it may send information or data to other devices, or receive other devices. Information or data sent by the device.
  • the transceiver 630 may include a transmitter and a receiver.
  • the transceiver 630 may further include an antenna, and the number of antennas may be one or more.
  • the communication device 600 may specifically be a network device in an embodiment of the present application, and the communication device 600 may implement the corresponding process implemented by the network device in each method of the embodiment of the present application. For brevity, details are not repeated here. .
  • the communication device 600 may specifically be a mobile terminal/terminal according to an embodiment of the application, and the communication device 600 may implement the corresponding procedures implemented by the mobile terminal/terminal in each method of the embodiments of the application. For the sake of brevity, This will not be repeated here.
  • FIG. 9 is a schematic structural diagram of a chip of an embodiment of the present application.
  • the chip 700 shown in FIG. 9 includes a processor 710, and the processor 710 can call and run a computer program from the memory to implement the method in the embodiment of the present application.
  • the chip 700 may further include a memory 720.
  • the processor 710 may call and run a computer program from the memory 720 to implement the method in the embodiment of the present application.
  • the memory 720 may be a separate device independent of the processor 710, or may be integrated in the processor 710.
  • the chip 700 may further include an input interface 730.
  • the processor 710 may control the input interface 730 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.
  • the chip 700 may further include an output interface 740.
  • the processor 710 can control the output interface 740 to communicate with other devices or chips, and specifically, can output information or data to other devices or chips.
  • the chip can be applied to the network device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the network device in the various methods of the embodiment of the present application.
  • the chip can implement the corresponding process implemented by the network device in the various methods of the embodiment of the present application.
  • the chip can be applied to the mobile terminal/terminal in the embodiment of the present application, and the chip can implement the corresponding process implemented by the mobile terminal/terminal in each method of the embodiment of the present application.
  • the chip can implement the corresponding process implemented by the mobile terminal/terminal in each method of the embodiment of the present application.
  • it will not be omitted here. Repeat.
  • the chip mentioned in the embodiment of the present application may also be referred to as a system-level chip, a system-on-chip, a system-on-chip, or a system-on-chip.
  • FIG. 10 is a schematic block diagram of a communication system 900 according to an embodiment of the present application. As shown in FIG. 10, the communication system 900 includes a terminal 910 and a network device 920.
  • the terminal 910 may be used to implement the corresponding functions implemented by the terminal in the foregoing method
  • the network device 920 may be used to implement the corresponding functions implemented by the network device in the foregoing method.
  • details are not described herein again.
  • the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capability.
  • the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
  • the aforementioned processor may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP Digital Signal Processor
  • ASIC application specific integrated circuit
  • FPGA ready-made programmable gate array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the memory in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), and electrically available Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be a random access memory (Random Access Memory, RAM), which is used as an external cache.
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • SDRAM double data rate synchronous dynamic random access memory
  • Double Data Rate SDRAM DDR SDRAM
  • ESDRAM enhanced synchronous dynamic random access memory
  • Synchlink DRAM SLDRAM
  • DR RAM Direct Rambus RAM
  • the memory in the embodiment of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is to say, the memory in the embodiment of the present application is intended to include but not limited to these and any other suitable types of memory.
  • the embodiment of the present application also provides a computer-readable storage medium for storing computer programs.
  • the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the computer-readable storage medium may be applied to the mobile terminal/terminal in the embodiments of the present application, and the computer program causes the computer to execute the corresponding processes implemented by the mobile terminal/terminal in the various methods of the embodiments of the present application, for It’s concise and will not be repeated here.
  • the embodiments of the present application also provide a computer program product, including computer program instructions.
  • the computer program product may be applied to the network device in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the computer program product can be applied to the mobile terminal/terminal in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding procedures implemented by the mobile terminal/terminal in the various methods of the embodiments of the present application, for the sake of brevity , I won’t repeat it here.
  • the embodiment of the present application also provides a computer program.
  • the computer program can be applied to the network device in the embodiment of the present application.
  • the computer program runs on the computer, the computer is caused to execute the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • I won’t repeat it here.
  • the computer program can be applied to the mobile terminal/terminal in the embodiments of the present application.
  • the computer program runs on the computer, the computer can execute the corresponding methods implemented by the mobile terminal/terminal in the various methods of the embodiments of the present application. For the sake of brevity, the process will not be repeated here.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • 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, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory,) ROM, random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

Abstract

La présente invention porte, selon les modes de réalisation, sur un procédé et un appareil d'accès aléatoire, sur un terminal et sur un dispositif de réseau. Ledit procédé comprend un terminal recevant, dans une première fenêtre, une première réponse d'accès aléatoire, la première réponse d'accès aléatoire comportant des premières informations, les premières informations étant utilisées pour indiquer un canal d'accès aléatoire associé à la première réponse d'accès aléatoire.
PCT/CN2019/079205 2019-03-22 2019-03-22 Procédé et appareil d'accès aléatoire, terminal et dispositif de réseau WO2020191515A1 (fr)

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CN201980082724.6A CN113170514B (zh) 2019-03-22 2019-03-22 一种随机接入方法及装置、终端、网络设备

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