WO2020172777A1 - Procédé et appareil d'accès aléatoire - Google Patents

Procédé et appareil d'accès aléatoire Download PDF

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Publication number
WO2020172777A1
WO2020172777A1 PCT/CN2019/076089 CN2019076089W WO2020172777A1 WO 2020172777 A1 WO2020172777 A1 WO 2020172777A1 CN 2019076089 W CN2019076089 W CN 2019076089W WO 2020172777 A1 WO2020172777 A1 WO 2020172777A1
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WIPO (PCT)
Prior art keywords
resource
pusch
type
message
terminal device
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PCT/CN2019/076089
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English (en)
Chinese (zh)
Inventor
徐伟杰
吴作敏
贺传峰
Original Assignee
Oppo广东移动通信有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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/CN2019/076089 priority Critical patent/WO2020172777A1/fr
Priority to CN201980023412.8A priority patent/CN111972032B/zh
Publication of WO2020172777A1 publication Critical patent/WO2020172777A1/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

Definitions

  • the embodiments of the present application relate to the field of communications, and more specifically, to methods and devices for random access.
  • the 5G system or New Radio (NR) system allows the use of 2-step random access (2-step RA).
  • message 1 (Msg1) and message 3 (Msg 3) in 4-step random access (4-step RA) can be sent as the first message in 2-step random access.
  • Msg 2 and Msg 4 in the 4-step random access process as the second message in the 2-step random access.
  • the transmission of the first message has a great impact on the 2-step random access process. Therefore, how to realize the effective transmission of the first message becomes an urgent problem to be solved.
  • This application provides a method and equipment for random access, which can realize effective transmission of the first message in 2-step random access.
  • a random access method including: a terminal device sends a first message in 2-step random access, the first message includes a PUSCH and a preamble, and the PUSCH is in the preamble. Sent before the code.
  • a random access method including: a terminal device selects a target resource type from a first type of resource and a second type of resource; the terminal device uses the target resource type to send a 2-step random access The first message entered.
  • the first type resource includes a first PUSCH resource and a first PRACH resource located after the first PUSCH resource
  • the second type resource includes a second PRACH resource and a first PRACH resource located after the second PRACH resource.
  • Two PUSCH resources, the first PUSCH resource and the second PUSCH resource are used to transmit the PUSCH in the first message
  • the first PRACH resource and the second PRACH resource are used to transmit the first The preamble in the message.
  • a terminal device including 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 above-mentioned first aspect or the method in any possible implementation of the first aspect.
  • a communication system including terminal equipment and network equipment.
  • the network device is used to configure the first type of resources
  • the terminal device is configured to: use the first-type resource to send the first message in 2-step random access;
  • the first type resource includes a first PUSCH resource and a first PRACH resource located after the first PUSCH resource, the first PUSCH resource is used to send the PUSCH in the first message, and the first PUSCH resource is A PRACH resource is used to send the preamble in the first message.
  • a communication system including terminal equipment and network equipment.
  • the network device is used to configure the first type of resource and the second type of resource
  • the terminal device is configured to: select a target resource type from the first type of resource and the second type of resource, and use the target resource type to send the first message in 2-step random access;
  • the first type resource includes a first PUSCH resource and a first PRACH resource located after the first PUSCH resource
  • the second type resource includes a second PRACH resource and a first PRACH resource located after the second PRACH resource.
  • Two PUSCH resources, the first PUSCH resource and the second PUSCH resource are used to transmit the PUSCH in the first message
  • the first PRACH resource and the second PRACH resource are used to transmit the first The preamble in the message.
  • the first type of resource used to transmit the first message in the 2-step random access process is configured, where the first type of resource includes the first PUSCH resource and the first PRACH located after the first PUSCH resource Therefore, the terminal device can send the PUSCH and the preamble in the first message on the first PUSCH resource and the first PRACH resource in sequence, thereby realizing effective transmission of the first message.
  • the second type of resource includes a second PRACH resource and a second PUSCH resource located after the second PRACH resource, and the terminal device can be in the two types of resources Choose a suitable type of resource to transmit the first message. Even if one type of resource is currently missed, another type of resource can be used to continue to transmit the first message without waiting for the next resource cycle, which greatly reduces the first message. The delay of the message.
  • Fig. 1 is a schematic diagram of a possible wireless communication system applied by an embodiment of the present application.
  • Figure 2 is a schematic flow chart of the 4-step random access.
  • Figure 3 is a schematic flow chart of 2-step random access
  • Figure 4 is a schematic diagram of a second type of resource in an embodiment of the present application.
  • Fig. 5 is a flow interaction diagram of a random access method according to an embodiment of the present application.
  • Fig. 6 is a schematic diagram of a first type of resource in an embodiment of the present application.
  • Fig. 7 is a flow interaction diagram of a random access method according to an embodiment of the present application.
  • Figures 8(a) and 8(b) are schematic diagrams of resources of the first type of resources located before the second type of resources in an embodiment of the present application.
  • Fig. 9(a) is a schematic diagram of overlapping of the first PRACH resource and the second PRACH resource in an embodiment of the present application.
  • Figures 10(a) and 10(b) are schematic diagrams of resources of the first type of resources located behind the second type of resources in an embodiment of the present application.
  • FIG. 11 is a schematic diagram of overlapping of the first PUSCH resource and the second PUSCH resource in an embodiment of the present application.
  • FIG. 12 is a schematic diagram of a terminal device in an embodiment of the present application selecting a first-type resource or a second-type resource.
  • FIG. 14 is a schematic block diagram of a terminal device according to an embodiment of the present application.
  • FIG. 15 is a schematic block diagram of a terminal device according to an embodiment of the present application.
  • FIG. 16 is a schematic block diagram of a network device according to an embodiment of the present application.
  • FIG. 17 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 18 is a schematic structural diagram of a chip of an embodiment of the present application.
  • FIG. 19 is a schematic block diagram of a communication system according to an embodiment of the present 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
  • LTE-A Advanced long term evolution
  • NR New Radio
  • NR NR system evolution system
  • LTE on unlicensed frequency bands LTE-based access to unlicensed spectrum, LTE-U
  • NR NR-based access to unlicensed spectrum, NR-U
  • UMTS Universal Mobile Telecommunication System
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • WiMAX Wireless Local Area Networks
  • WLAN Wireless Fidelity
  • WiFi next-generation communication systems or other communication systems, etc.
  • D2D Device to Device
  • M2M Machine to Machine
  • MTC machine type communication
  • V2V vehicle to vehicle
  • the communication system in the embodiments of the present application can be applied to scenarios such as carrier aggregation (CA), dual connectivity (DC), and standalone (SA) networking.
  • CA carrier aggregation
  • DC dual connectivity
  • SA standalone networking
  • the wireless communication system 100 may include a network device 110.
  • the network device 110 may be a device that communicates with terminal devices.
  • the network device 110 may provide communication coverage for a specific geographic area, and may communicate with terminal devices located in the coverage area.
  • the network device 100 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 network side device in the NR system, or the wireless controller in the Cloud Radio Access Network (CRAN), or the network device can be a relay station or Entry points, in-vehicle devices, wearable devices, network-side devices in next-generation 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 Node B
  • eNodeB evolved base station
  • the network side device in the NR system
  • the network device can be a relay station or Entry points
  • the wireless communication system 100 also includes at least one terminal device 120 located within the coverage area of the network device 110.
  • the terminal device 120 may be mobile or fixed.
  • the terminal device 120 may refer to an access terminal, user equipment (UE), user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, terminal, wireless communication Equipment, user agent or user device.
  • UE user equipment
  • 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, terminal devices in the future 5G network or terminal devices in the future evolved PLMN, etc.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • D2D direct terminal
  • the network device 110 may provide services for a cell, and the terminal device 120 communicates with the network device 110 through transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell.
  • the cell may be the network device 110 (for example, a base station)
  • the corresponding cell the cell can belong to a macro base station or a base station corresponding to a small cell (Small cell).
  • the small cell here can include, for example, a metro cell, a micro cell, and a pico cell. Femto cells, etc. These small cells have the characteristics of small coverage and low transmit power, and are suitable for providing high-rate data transmission services.
  • Figure 1 exemplarily shows one network device and two terminal devices.
  • the wireless communication system 100 may include multiple network devices and the coverage of each network device may include other numbers of terminal devices. The application embodiment does not limit this.
  • the wireless 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.
  • random access may be triggered due to RRC active state (RRC_INACTIVE) transition, other system information (Other System Information, OSI), or beam failure recovery (beam failure recovery) and other reasons.
  • RRC_INACTIVE RRC active state
  • OSI System Information
  • beam failure recovery beam failure recovery
  • the network device After receiving the Msg 1 sent by the terminal device, the network device sends Msg 2, that is, a random access response (Random Access Response, RAR) message to the terminal device.
  • the Msg 2 can be scrambled through a random access radio network temporary identity (Random Access Radio Network Temporary Identity, RA-RNTI).
  • the terminal device can monitor the Physical Downlink Control Channel (PDCCH) in the RAR window to receive the RAR message scrambled with the RA-RNTI, regardless of the measurement gap that may occur .
  • PDCCH Physical Downlink Control Channel
  • the terminal device If the terminal device does not receive the RAR message replies from the network device within the RAR window, it is considered that this random access has failed. If the terminal device successfully detects the RAR message in the RAR window and the index of the preamble carried in the RAR message is the same as the index of the preamble in Msg 1, the terminal device can stop detecting the RAR message. The terminal device can use RA-RNTI to descramble the RAR message.
  • the RAR message may include response messages for multiple terminal devices that send the preamble.
  • the response message for each terminal device includes the random access preamble index (Random Access Preamble Identify, RAPID), Msg 3 resource allocation information, and time advance (Time Advance, TA) adjustment information used by the terminal device. , And Temporary Cell-Radio Network Temporary Identity (TC-RNTI), etc.
  • the RAR message can be scheduled in a downlink control information (Download Control Information, DCI) format (DCI format) 1-0, and the PDCCH for scheduling the RAR message can be scrambled using the aforementioned RA-RNTI.
  • DCI Download Control Information
  • Step 3 The terminal device sends Msg 3.
  • the terminal device After receiving the RAR message, the terminal device determines whether the RAR is its own RAR message. For example, the terminal device can use the preamble index to check, and after determining that it is its own RAR message, it generates Msg 3 at the RRC layer and sends it to The network device sends Msg 3, which needs to carry the identification information of the terminal device, etc.
  • the Msg 3 sent by the terminal device in step 3 of the 4-step random access process may include different content.
  • Msg 3 includes the RRC Connection Request message (RRC Connection Request) generated by the RRC layer, which at least carries the non-access stratum (Non-Access Stratum, NAS) identification information of the terminal device.
  • RRC Connection Request RRC Connection Request
  • Msg 3 may also carry, for example, the serving temporary mobile subscriber identity (Serving-Temporary Mobile Subscriber Identity, S-TMSI) or random number of the terminal device.
  • S-TMSI Serving-Temporary Mobile Subscriber Identity
  • Msg 3 includes the RRC Connection Re-establishment Request message (RRC Connection Re-establishment Request) generated by the RRC layer and does not carry any NAS message.
  • RRC Connection Re-establishment Request RRC Connection Re-establishment Request
  • Msg 3 may also carry, for example, a Cell Radio Network Temporary Identifier (C-RNTI) and protocol control information (Protocol Control Information, PCI).
  • C-RNTI Cell Radio Network Temporary Identifier
  • PCI Protocol Control Information
  • the network device sends Msg 4 to the terminal device, and the terminal device correctly receives the Msg 4 to complete the contention resolution (Contention Resolution).
  • Msg 4 may carry the RRC connection establishment message.
  • Msg3 Since the terminal equipment in step 3 will carry its own unique identifier in Msg3, such as C-RNTI or identification information from the core network (such as S-TMSI or a random number), the network equipment will be in the contention resolution mechanism. Msg4 carries the unique identifier of the terminal device to specify the terminal device that wins the competition. Other terminal devices that did not win in the contention resolution will re-initiate random access.
  • the PDCCH used for scheduling Msg4 can be scrambled using TC-RNTI.
  • Step 1 The terminal device sends the first message.
  • the network device If the network device successfully receives the first message sent by the terminal device, it sends the second message to the terminal device.
  • the second message may include conflict resolution information, C-RNTI allocation information, TA adjustment information, etc., for example.
  • the second message may carry part or all of the information carried in Msg 2 and Msg 4 in the 4-step random access process.
  • the second message carries conflict resolution information for a single terminal device (including the information related to the identification of the terminal device sent by the terminal device in the first message), C-RNTI allocation information, TA adjustment information, etc.
  • the second message may also carry an RRC connection establishment message.
  • the first message to the fourth message in the 4-step random access process are called "Msg 1, Msg 2, Msg 3, and Msg 4" respectively. Accordingly, the first message in the 2-step random access process is referred to here.
  • One message and the second message are also called “Msg A or New Msg 1 (New_Msg 1)” and “Msg B or New Msg 2 (New_Msg 2)" respectively.
  • Msg A may include part or all of the information carried in Msg 1 and Msg 3.
  • Msg B may include part or all of the information carried in Msg 2 and Msg 4.
  • the first-type resources and the second-type resources may be configured at the same time, or only the first-type resources or only the second-type resources may be configured.
  • the following describes the first-type resources in the embodiments of the present application with reference to Figs. 5 and 6, and the simultaneous configuration of the first-type resources and the second-type resources in the embodiments of the present application with reference to Figs. 7 to 13.
  • FIG. 5 is a schematic flowchart of a random access method 500 according to an embodiment of the present application.
  • the method described in FIG. 5 may be executed by a terminal device and a network device.
  • the terminal device may be, for example, the terminal device 120 shown in FIG. 1
  • the network device may be, for example, the network device 110 shown in FIG. 1.
  • the random access method 500 may include some or all of the following steps. among them:
  • the first message includes the PUSCH and the preamble, and the PUSCH is sent before the preamble, that is, the PUSCH is sent before the preamble.
  • the Orthogonal Frequency Division Multiplexing (OFDM) symbol or time slot where the first PUSCH resource is located is before the time slot or symbol where the preamble is located.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the terminal device may use the first type of resource to send the first message, where the first type of resource includes the first PUSCH resource and the first PRACH resource located after the first PUSCH resource, and the first PUSCH resource Used to send the PUSCH in the first message, and the first PRACH resource is used to send the preamble in the first message.
  • the network device receives the first message sent by the terminal device.
  • the network device may configure a first type of resource for the terminal device.
  • the first type of resource includes the first PUSCH resource used to transmit the PUSCH in the first message and the preamble used to transmit the first message.
  • the first PRACH resource of the code where the first PUSCH resource is located before the first PRACH resource.
  • the first PUSCH resource is a time-frequency resource used to transmit the PUSCH; or, the first PUSCH resource is a time-frequency resource used to transmit the PUSCH and a demodulation reference signal (Dedicated Reference Signal, DMRS) corresponding to the PUSCH ), the DMRS is used to demodulate its corresponding PUSCH.
  • DMRS Dedicated Reference Signal
  • the first type of resource includes a first PUSCH resource and a first PRACH resource located after the first PUSCH resource, and a guard time GT1 is configured between the first PRACH resource and the first PUSCH.
  • the protection time may be configured by the network device for the terminal device, or may be pre-configured, for example, as agreed in the protocol.
  • the first PRACH resource is also used to transmit a cyclic prefix (Cyclic Prefix, CP) of the preamble, and the cyclic prefix is located before the preamble.
  • CP Cyclic Prefix
  • the terminal device sequentially transmits the cyclic prefix and the preamble on the first PRACH resource.
  • the first PUSCH resource and the first PRACH resource do not overlap, partially overlap, or completely overlap in the frequency domain.
  • the bandwidth of the first PUSCH resource and the first PRACH resource are the same or different.
  • the bandwidth of the first PUSCH resource is greater than the bandwidth of the first PRACH resource, and the first PUSCH resource and the first PRACH resource overlap in the frequency domain.
  • multiple first PUSCH resources correspond to multiple preambles one-to-one; and/or one first PUSCH resource corresponds to multiple preambles; and/or, one preamble corresponds to multiple preambles One PUSCH.
  • M N or M ⁇ N.
  • the first PUSCH resource may also have a corresponding relationship with the first PRACH resource.
  • the first PUSCH resource corresponds to the first PRACH resource one to one; and/or the first PUSCH resource corresponds to a plurality of the first PRACH resources; or, the first PRACH resource corresponds to a plurality of the first PRACH resources; PUSCH resources.
  • the resources used to transmit the first message may be configured periodically.
  • the number of resources of the first type may be configured by the network device or pre-configured, for example, as stipulated in the protocol .
  • the terminal device may select the resource with the best signal quality among the multiple first-type resources to send its first message.
  • the terminal device can measure the reference signal receiving power (RSRP) or the reference signal receiving quality (RSRQ) of the synchronization signal block (Synchronization Signal Block, SSB or SS/PBCH Block), And send the first message on the first type resource corresponding to the synchronization signal block with the best measurement result.
  • RSRP reference signal receiving power
  • RSRQ reference signal receiving quality
  • the network device receives the first message, including: the network device buffers the received PUSCH; if the network device successfully detects the preamble in the first message, the network device is buffering In the PUSCH, detect the PUSCH in the first message.
  • the network device detects the PUSCH in the first message in the buffered PUSCH, including: the network device determines the location of the first PUSCH resource corresponding to the preamble according to the successfully detected preamble; the network device is in the On the first PUSCH resource, the PUSCH in the first message is detected.
  • the network device receiving the first message includes: the network device blindly checking the PUSCH in the first message on all the first PUSCH resources.
  • the terminal device uses the first type of resource to send the first message. Since the PUSCH is sent before the preamble, the network device blindly detects the PUSCH from the PUSCH resources in all the first messages. Specifically, the network device may detect the DMRS corresponding to the PUSCH to determine whether the first message is sent. If the network device detects the DMRS, it further detects the PUSCH corresponding to the DMRS.
  • the network device may also configure a second type of resource for the terminal device.
  • the second type of resource includes a second PRACH resource and a second PUSCH resource located after the second PRACH resource.
  • the second PUSCH resource is used to transmit the second PRACH resource.
  • the second PRACH resource is used to transmit the preamble in the first message.
  • the terminal device selects a target resource type from the first type of resource and the second type of resource.
  • the network device can configure the first type of resource and the second type of resource for the terminal device at the same time, and the first type of resource includes the first PUSCH resource for transmitting the PUSCH and the first PRACH resource for transmitting the preamble,
  • the first PUSCH resource is located before the first PRACH resource.
  • the second type of resource includes a second PUSCH resource used for transmitting PUSCH and a second PRACH resource used for transmitting a preamble, where the second PUSCH resource is located after the second PRACH resource.
  • the terminal device can select a suitable resource from the two types of resources to transmit the first message. Even if one of the resources is currently missed, it can use the other resource to continue to transmit the first message without waiting for the next resource. Period, greatly reducing the transmission delay of the first message.
  • the first PUSCH resource is a time-frequency resource used to transmit the PUSCH; or, the first PUSCH resource is a time-frequency resource used to transmit the PUSCH and a DMRS corresponding to the PUSCH, and the DMRS is used to demodulate its corresponding Of the PUSCH.
  • the second PUSCH resource is a time-frequency resource used to transmit the PUSCH; or, the second PUSCH resource is a time-frequency resource used to transmit the PUSCH corresponding to the PUSCH, and the DMRS is used to demodulate the corresponding PUSCH .
  • a guard time GT1 may be set between the first PUSCH resource and the first PRACH resource.
  • a guard time GT2 may be set between the second PUSCH resource and the second PRACH resource.
  • the first PRACH resource and the second PRACH resource overlap in the time domain and/or the frequency domain.
  • the first type of resource is located before the second type of resource.
  • the first type of resource includes the first PUSCH resource, the guard time GT1, and the first PRACH resource in order from front to back in the time domain.
  • One PUSCH is transmitted on each first PUSCH resource, such as PUSCH 1, PUSCH 2, etc.
  • Each preamble resource in the first PRACH resource transmits a preamble, such as preamble 1, preamble 2, and so on.
  • the second type of resource includes the second PRACH resource, the guard time GT2, and the second PUSCH resource in order from front to back in the time domain.
  • One PUSCH is transmitted on each second PUSCH resource, such as PUSCH 3, PUSCH 4, etc.
  • Each preamble resource in the second PRACH resource transmits a preamble, such as preamble 3, preamble 4, and so on.
  • the first type of resource is located before the second type of resource.
  • the first PRACH resource in the first type of resource and the second PRACH resource in the second type of resource completely overlap in the time domain.
  • one PRACH resource includes multiple preamble resources, each preamble resource is used to transmit one preamble, and one PRACH resource can transmit multiple preamble resources.
  • the first type of resource is located before the second type of resource.
  • the first PRACH resource in the first type resource and the second PRACH resource in the second type resource partially overlap in the time domain.
  • the resources of the first type and the resources of the second type may not overlap in the time domain.
  • the embodiments of the present application do not make any restriction on the time-frequency positions of the first-type resources and the second-type resources.
  • the first PRACH resource in the first type of resource and the second PRACH resource in the second type of resource overlap both in the time domain and the frequency domain. That is, the first type resources and the second type resources share PRACH resources.
  • the first PRACH resource and the second PRACH resource are the same PRACH resource, but different parts of the same PRACH resource may belong to the first type of resource and the second type of resource, respectively.
  • the part of the same PRACH resource that belongs to the first type of resource is used to transmit preamble 0 to preamble 5
  • the part of the same PRACH resource that belongs to the second type of resource is used to transmit preamble 6 to preamble. 11.
  • the terminal device selects the first type of resource, it selects the preamble carried in the first message from preamble 0 to preamble 5, and sends the PUSCH on the PUSCH resource corresponding to the selected preamble; if the terminal device selects For the second type of resources, the preamble carried in the first message is selected from preamble 6 to preamble 1, and the PUSCH is sent on the PUSCH resource corresponding to the selected preamble.
  • the second-type resource is located before the first-type resource.
  • the time domain start position of the second PRACH resource in the second type resource is located before the time domain start position of the first PUSCH resource in the first type resource.
  • the first PUSCH resource and the second PUSCH resource overlap in the time domain and/or the frequency domain.
  • the second type resource is located before the first type resource.
  • the second type of resource includes the second PRACH resource, the guard time GT2, and the second PUSCH resource in order from front to back in the time domain.
  • One PUSCH is transmitted on each second PUSCH resource, such as PUSCH 1, PUSCH 2, etc.
  • Each preamble resource in the second PRACH resource transmits a preamble, such as preamble 1, preamble 2, and so on.
  • the first type of resource includes the first PUSCH resource, the guard time GT1, and the first PRACH resource in order from front to back in the time domain.
  • One PUSCH is transmitted on each second PUSCH resource, such as PUSCH 3, PUSCH 4, etc.
  • Each preamble resource in the second PRACH resource transmits a preamble, such as preamble 3, preamble 4, and so on.
  • the second type of resource is located before the first type of resource.
  • the second PUSCH resource in the second type resource and the first PUSCH resource in the first type resource completely overlap in the time domain.
  • the resources of the first type and the resources of the second type may not overlap in the time domain.
  • the embodiments of the present application do not make any restriction on the time-frequency positions of the first-type resources and the second-type resources.
  • the first PUSCH resource and the second PUSCH resource may overlap in both the time domain and the frequency domain.
  • multiple first PUSCH resources correspond to multiple preambles one-to-one; and/or one first PUSCH resource corresponds to multiple preambles; and/or, one preamble corresponds to multiple preambles One PUSCH.
  • multiple second PUSCH resources correspond to multiple preambles one-to-one; and/or one second PUSCH resource corresponds to multiple preambles; and/or, one preamble corresponds to multiple first preambles Two PUSCH.
  • mapping manner between the preamble and PUSCH resources transmitted on the first type of resources may be the same or different from the mapping manner between the preamble and PUSCH resources transmitted on the second type of resources.
  • the first PUSCH resource corresponds to the first PRACH resource one to one; and/or the first PUSCH resource corresponds to a plurality of the first PRACH resources; or, the first PRACH resource corresponds to a plurality of the first PRACH resources; PUSCH resources.
  • the second PUSCH resource corresponds to the second PRACH resource one-to-one; and/or, the second PUSCH resource corresponds to a plurality of the second PRACH resources; or, the second PRACH resource corresponds to a plurality of the second PRACH resources PUSCH resources.
  • the number of resources of the first type and the number of resources of the second type in a resource period of the first message are the same or different.
  • the current moment may be the moment when the terminal device expects to perform the 2-step random access procedure or the moment when it expects to send the first message, or the moment when the terminal device decides to execute the 2-step random access procedure or decides to send the The moment of the first message.
  • the terminal device needs to select one of the first type of resource and the second type of resource to send its first message. Specifically, the terminal device will select the earliest resource type that can be used to transmit the first message from the current moment. As the target resource type. It should be noted here that the terminal device must not only consider the sequence of the first type of resource and the second type of resource in the time domain, but also consider whether the first type of resource and the second type of resource can be used from the current moment.
  • the terminal device if the terminal device expects to initiate a 2-step random access at time T1, then the earliest resource that can be used to transmit the first message from time T1 is For the second type of resource in resource period 2, the terminal device will use the second type of resource to sequentially send the preamble and PUSCH in its first message. If the terminal device expects to initiate a 2-step random access at time T2, since the terminal device has missed the first part of the second type of resources in resource cycle 2 at time T2, and therefore cannot use the second type of resources, then start from T2 The earliest resource that can be used to transmit the first message is the first-type resource in resource period 2. The terminal device will use the first-type resource to send the PUSCH and preamble in its first message in sequence.
  • the terminal device After the terminal device selects the target resource type from the first type of resource and the second type of resource, optionally, the terminal device may select the resource with the best signal quality among multiple resources belonging to the target resource type to send the second resource type. a message.
  • the terminal device can measure the RSRP or RSRQ of the SSB. If the terminal device selects the first type of resource, the first message is sent on the first type of resource with the highest RSRP and/or the highest RSRQ; if the terminal device selects If the second type of resource is used, the first message is sent on the second type of resource corresponding to the SSB with the highest RSRP and/or the highest RSRQ.
  • the network device may also configure the first transmission window and the second transmission window.
  • the first type resource and the second type resource in a resource period correspond to the first transmission window and the second transmission window, respectively.
  • the first transmission window and the second transmission window are used to transmit the second message (ie, Msg B) in the 2-step random access process.
  • the network device receives the first message sent by the terminal device on the first type of resource, it sends the second message to the terminal device in the first transmission window; and/or, if the network device When the first message sent by the terminal device is received on the second-type resource, the second message is sent to the terminal device in the second transmission window.
  • the terminal device if the terminal device uses the first type of resource to send the first message, the terminal device receives the second message in the first transmission window; and/or if the terminal device uses the second type of resource After sending the first message, the terminal device receives the second message in the second transmission window.
  • the length of the second transmission window and the first transmission window may be the same or different.
  • the time domain start position of the second transmission window and the first transmission window are the same or different.
  • the time domain start position of the first transmission window is immediately adjacent to the time domain end position of the first type resource, or between the time domain start position of the first transmission window and the time domain end position of the first type resource There is a time interval.
  • the first type of resource in Figure 13 (a) is located before the second type of resource
  • the second type of resource in Figure 13 (b) is located in the first type of resource
  • the first transmission window and the second transmission window in Figure 13 (a) and Figure 13 (b) were located after the first type of resource and the second type of resource, and the length of the first transmission window and the length of the second transmission window The length is equal.
  • the terminal device sends the first message on the first type of resource, the network device receives the first message on the first type of resource, and then the network device sends the second message in the first transmission window, and the terminal device transmits Receive the second message in the window.
  • the terminal device sends the first message on the second type resource
  • the network device receives the first message on the second type resource
  • the network device sends the second message in the second transmission window
  • the terminal device The second message is received in the second transmission window.
  • the first transmission window and the second transmission window may be used for the terminal device to blindly check a physical downlink control channel (Physical Downlink Control Channel, PDCCH), and the PDCCH is used to schedule the physical downlink sharing that carries the second message Channel (Physical Downlink Shared Channel, PDSCH).
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • the network device sends the PDCCH in the first transmission window, and the PDCCH is used to schedule the PDSCH that carries the second message.
  • the terminal device blindly detects the PDCCH in the first transmission window, and the DCI carried in the PDCCH is used to indicate the resource information of the PDSCH, so that the terminal device is at the resource position in the second transmission window according to the resource position indicated by the DCI Receive the PDSCH carrying the second message sent by the network device.
  • FIG. 14 is a schematic block diagram of a terminal device 1400 according to an embodiment of the present application.
  • the terminal device 1400 includes a processing unit 1410 and a transceiver unit 1420. among them:
  • the transceiver unit 1420 is configured to send the first message, where the PUSCH is sent before the preamble.
  • the first PRACH resource is also used to transmit a cyclic prefix of the preamble, and the cyclic prefix is located before the preamble.
  • the first PUSCH resource and the first PRACH resource do not overlap, partially overlap, or completely overlap in the frequency domain.
  • the bandwidth of the first PUSCH resource and the first PRACH resource are the same or different.
  • multiple first PUSCH resources correspond to multiple preambles one-to-one; and/or one first PUSCH resource corresponds to multiple preambles; and/or, one preamble corresponds to multiple The first PUSCH resource.
  • the first PUSCH resource is a time-frequency resource used to transmit the PUSCH, or the first PUSCH resource is a time-frequency resource used to transmit the PUSCH and a demodulation reference signal corresponding to the PUSCH DMRS.
  • terminal device 1400 can perform corresponding operations performed by the terminal device in the method 500 of the embodiment of the present application, and for the sake of brevity, details are not described herein again.
  • FIG. 15 is a schematic block diagram of a terminal device 1500 according to an embodiment of the present application.
  • the terminal device 1500 includes a processing unit 1510 and a transceiver unit 1520. among them:
  • the processing unit 1510 is configured to select a target resource type from the first type of resource and the second type of resource;
  • the first type resource includes a first PUSCH resource and a first PRACH resource located after the first PUSCH resource
  • the second type resource includes a second PRACH resource and a first PRACH resource located after the second PRACH resource.
  • Two PUSCH resources, the first PUSCH resource and the second PUSCH resource are used to transmit the PUSCH in the first message
  • the first PRACH resource and the second PRACH resource are used to transmit the first The preamble in the message.
  • the first type of resource includes the first PUSCH resource and the first PRACH resource located after the first PUSCH resource
  • the second type of resource includes the second PRACH resource and the first PRACH resource located there.
  • the second PUSCH resource after the second PRACH resource enables the terminal device to select a suitable resource from the two types of resources to transmit the first message. Even if one type of resource is currently missed, the other type of resource can be used to continue transmission.
  • the first message does not have to wait until the next resource period, which greatly reduces the delay of the first message, and further reduces the delay of the 2-step random access process.
  • the first PUSCH resource and the second PUSCH resource overlap in the time domain and/or the frequency domain.
  • the first type of resource is located before the second type of resource.
  • the first PRACH resource and the second PRACH resource overlap in the time domain and/or the frequency domain.
  • multiple first PUSCH resources correspond to multiple preambles one-to-one; and/or one first PUSCH resource corresponds to multiple preambles; and/or, one preamble corresponds to multiple The first PUSCH resource.
  • multiple second PUSCH resources correspond to multiple preambles one-to-one; and/or, one second PUSCH resource corresponds to multiple preambles; and/or, one preamble corresponds to multiple The second PUSCH resource.
  • the first PUSCH resource is a time-frequency resource used for transmitting the PUSCH, or the first PUSCH resource is a time-frequency resource used for transmitting the PUSCH and a DMRS corresponding to the PUSCH.
  • the second PUSCH resource is a time-frequency resource used for transmitting the PUSCH, or the second PUSCH resource is a time-frequency resource used for transmitting the PUSCH and a DMRS corresponding to the PUSCH.
  • the number of resources of the first type and the number of resources of the second type in one resource period of the first message are the same or different.
  • the processing unit 1510 is specifically configured to: among the first-type resources and the second-type resources, select the resource type that can be used to transmit the first message at the earliest from the current moment as the source. State the target resource type.
  • the transceiving unit 1520 is specifically configured to select a resource with the best signal quality among multiple resources belonging to the target resource type to send the first message.
  • the first type of resource and the second type of resource in one resource period correspond to a first transmission window and a second transmission window, respectively, and the transceiving unit 1520 is further configured to: if the first type of resource is used Class resources send the first message, then receive the second message in 2-step random access in the first transmission window; and/or, if the second class resources are used to send the first message , The second message is received in the second transmission window.
  • the first transmission window and the second transmission window are used for the terminal device to blindly detect a PDCCH, and the PDCCH is used for scheduling a PDSCH carrying the second message.
  • the time domain start position of the first transmission window is immediately adjacent to the time domain end position of the first type resource, and/or the time domain start position of the second transmission window is immediately adjacent to the second The end position of the time domain of the class resource.
  • time interval between the time domain start position of the first transmission window and the time domain end position of the first type resource, and/or the time domain start position of the second transmission window There is a time interval between the end position of the time domain of the second type resource.
  • the length of the second transmission window and the first transmission window are the same or different.
  • terminal device 1500 can perform corresponding operations performed by the terminal device in the method 700 of the embodiment of the present application, and for the sake of brevity, details are not described herein again.
  • the first type of resource used to transmit the first message in the 2-step random access process is configured, where the first type of resource includes the first PUSCH resource and the first PRACH resource located after the first PUSCH resource, so The terminal device can sequentially send the PUSCH and the preamble in the first message on the first PUSCH resource and the first PRACH resource, thereby realizing effective transmission of the first message.
  • the second type of resource includes a second PRACH resource and a second PUSCH resource located after the second PRACH resource, and the terminal device can be in the two types of resources Choose a suitable type of resource to transmit the first message. Even if one type of resource is currently missed, another type of resource can be used to continue to transmit the first message without waiting for the next resource cycle, which greatly reduces the first message. The delay of the message.
  • the first PRACH resource is also used to transmit a cyclic prefix of the preamble, and the cyclic prefix is located before the preamble.
  • the first PUSCH resource and the first PRACH resource do not overlap, partially overlap, or completely overlap in the frequency domain.
  • the bandwidth of the first PUSCH resource and the first PRACH resource are the same or different.
  • multiple first PUSCH resources correspond to multiple preambles one-to-one; and/or one first PUSCH resource corresponds to multiple preambles; and/or, one preamble corresponds to multiple The first PUSCH resource.
  • the first PUSCH resource is a time-frequency resource used for transmitting the PUSCH, or the first PUSCH resource is a time-frequency resource used for transmitting the PUSCH and a DMRS corresponding to the PUSCH.
  • the processing unit 1610 is further configured to configure a second type of resource; the transceiving unit 1620 is further configured to: indicate the second type of resource to the terminal device; wherein, the second type of resource includes A second PRACH resource and a second PUSCH resource located after the second PRACH resource, the second PUSCH resource is used to transmit the PUSCH in the first message, and the second PRACH resource is used to transmit the first message.
  • the preamble in a message is further configured to configure a second type of resource;
  • the second type of resource is located before the first type of resource.
  • the first PUSCH resource and the second PUSCH resource overlap in the time domain and/or the frequency domain.
  • the first type of resource is located before the second type of resource.
  • the first PRACH resource and the second PRACH resource overlap in the time domain and/or the frequency domain.
  • the time domain length of the first type resource and the second type resource are the same or different.
  • the second PUSCH resource is a time-frequency resource used for transmitting the PUSCH, or the second PUSCH resource is a time-frequency resource used for transmitting the PUSCH and a DMRS corresponding to the PUSCH.
  • the number of resources of the first type and the number of resources of the second type in one resource period of the first message are the same or different.
  • the processing unit 1610 is further configured to configure a first transmission window and a second transmission window; wherein, the transceiving unit 1620 is further configured to: if the terminal device is received on the first type resource If the first message is sent, the second message in 2-step random access is sent to the terminal device in the first transmission window; and/or, if it is received on the second type of resource If the first message sent by the terminal device is sent, the second message is sent to the terminal device in the second transmission window.
  • the first transmission window and the second transmission window are used to send a physical downlink control channel PDCCH, and the PDCCH is used to schedule a physical downlink shared channel PDSCH that carries the second message.
  • network device 1600 can perform the corresponding operations performed by the network device in the methods of the various embodiments of the present application. For the sake of brevity, details are not described herein again.
  • the communication device 1700 may further include a memory 1720.
  • the processor 1710 may call and run a computer program from the memory 1720 to implement the method in the embodiment of the present application.
  • the memory 1720 may be a separate device independent of the processor 1710, or may be integrated in the processor 1710.
  • the communication device 1700 may further include a transceiver 1730, and the processor 1710 may control the transceiver 1730 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 communication device 1700 may specifically be a terminal device of an embodiment of the present application, and the communication device 1700 may implement the corresponding procedures implemented by the terminal device in each method of the embodiments of the present application. For brevity, details are not repeated here. .
  • FIG. 18 is a schematic structural diagram of a chip of an embodiment of the present application.
  • the chip 1800 shown in FIG. 18 includes a processor 1810, and the processor 1810 can call and run a computer program from the memory to implement the method in the embodiment of the present application.
  • the chip 1800 may further include an input interface 1830.
  • the processor 1810 can control the input interface 1830 to communicate with other devices or chips. Specifically, it can obtain information or data sent by other devices or chips.
  • the processor in 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.
  • FIG. 19 is a schematic block diagram of a communication system 1900 according to an embodiment of the present application. As shown in FIG. 19, the communication system 1900 includes a network device 1910 and a terminal device 1920.
  • FIG. 20 is a schematic block diagram of a communication system 2000 according to an embodiment of the present application. As shown in FIG. 20, the communication system 2000 includes a network device 2010 and a terminal device 2020.
  • the network device 2010 is used to configure the first-type resources and the second-type resources;
  • the first type resource includes a first PUSCH resource and a first PRACH resource located after the first PUSCH resource
  • the second type resource includes a second PRACH resource and a first PRACH resource located after the second PRACH resource.
  • Two PUSCH resources, the first PUSCH resource and the second PUSCH resource are used to transmit the PUSCH in the first message
  • the first PRACH resource and the second PRACH resource are used to transmit the first The preamble in the message.
  • the network device 2010 can be used to implement the corresponding functions implemented by the network device in the method of the embodiment of the present application, and the composition of the network device 2010 can be as shown in the network device 1600 in FIG. 16. For the sake of brevity, it will not be omitted here. Repeat.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the unit is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or may be Integrate 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 functional units in the various embodiments 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 .

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

L'invention concerne un procédé et un appareil d'accès aléatoire aptes à réaliser une transmission efficace d'un premier message dans une procédure d'accès aléatoire en deux étapes. Le procédé comprend les étapes suivantes : un appareil terminal transmet un premier message dans une procédure d'accès aléatoire en deux étapes, le premier message comprenant un canal partagé de liaison montante physique (PUSCH) et un préambule, et le PUSCH étant transmis avant la transmission du préambule.
PCT/CN2019/076089 2019-02-25 2019-02-25 Procédé et appareil d'accès aléatoire WO2020172777A1 (fr)

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