WO2024230321A1 - 一种随机接入方法及相关设备 - Google Patents

一种随机接入方法及相关设备 Download PDF

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Publication number
WO2024230321A1
WO2024230321A1 PCT/CN2024/082147 CN2024082147W WO2024230321A1 WO 2024230321 A1 WO2024230321 A1 WO 2024230321A1 CN 2024082147 W CN2024082147 W CN 2024082147W WO 2024230321 A1 WO2024230321 A1 WO 2024230321A1
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Prior art keywords
information
sub
random access
retransmission
response
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PCT/CN2024/082147
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English (en)
French (fr)
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WO2024230321A9 (zh
Inventor
张明珠
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Honor Device Co Ltd
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Honor Device Co Ltd
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Publication of WO2024230321A9 publication Critical patent/WO2024230321A9/zh
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present application relates to the field of communication technology, and in particular to a random access method and related equipment.
  • 5G communication systems can provide enhanced mobile broadband (eMBB), with faster connections, higher throughput and larger capacity, as well as ultra-reliable low-latency communications (uRLLC), so that the network can be applied in mission-critical scenarios that require uninterrupted and stable data links, meeting the ultra-high reliability and low latency requirements of wireless communication networks in the scenarios, and can provide massive machine type communications (mMTC), such as in the Internet of Things (IoT) scenario, connecting a large number of IoT devices.
  • eMBB enhanced mobile broadband
  • uRLLC ultra-reliable low-latency communications
  • mMTC massive machine type communications
  • IoT Internet of Things
  • the communication system may include network devices such as base stations. Each base station may support communication of multiple terminals, wherein the terminal may be a user equipment (UE).
  • the UE and other terminals may communicate with the base station through random access (RA).
  • RA random access
  • the UE may send a random access preamble (referred to as a preamble), for example, by sending a preamble through a first message (Message1, denoted as MSG1) or MessageA (denoted as MSGA), and after sending the preamble, open a random access response window (random access response window, RAR window) to monitor RAR (including RAR of a four-step random access process or fallback RAR of a two-step random access process), and when RAR is successfully monitored, for example, RAR in a second message (Message2, denoted as MSG2) or fallback RAR in MessageB (denoted as MSGB) is monitored, a third message may be sent to resolve the contention.
  • MSG1 first message
  • MessageA
  • NTN non-terrestrial network
  • TN terrestrial network
  • ms milliseconds
  • the above solution may cause the UE side to be unable to monitor the blind scheduling of MSG3 on the network side.
  • the present application provides a random access method and related equipment, which aims to solve the problem that when the network channel is poor, the network side instructs to perform blind scheduling of MSG3, and the terminal has difficulty monitoring the blind scheduling of the network side.
  • the first aspect of the present application provides a random access method.
  • the method can be performed by a first device.
  • the first device can be a device on the network side for providing a network communication function, which is also called a network device or a network element in some cases.
  • the network device can generally be a base station, a functional unit of a base station, or a combination of functional units of a base station.
  • the first information is indicated, and the first information corresponds to the blind retransmission information of the third message (message3, MSG3) in random access.
  • MSG3 can carry a radio resource control (RRC) connection request (RRC Connection Request) or an RRC connection re-establishment request (RRC Connection Re-establishment Request), so the third message is also called a scheduled transmission message.
  • RRC radio resource control
  • RRC Connection Re-establishment Request RRC Connection Re-establishment Request
  • RAR random access response
  • the first information includes at least one of the following sub-information: first sub-information, second sub-information, third sub-information, fourth sub-information, fifth sub-information, sixth sub-information or seventh sub-information.
  • the first sub-information is used to indicate whether to perform blind retransmission of MSG3 in random access;
  • the second sub-information is used to indicate whether to perform blind retransmission of MSG3 in four-step random access;
  • the third sub-information is used to indicate whether to perform blind retransmission of MSG3 in two-step random access;
  • the fourth sub-information is used to indicate whether to perform blind retransmission of MSG3 in four-step random access and whether to perform blind retransmission of MSG3 in two-step random access;
  • the fifth sub-information is used to indicate the blind retransmission threshold of MSG3 in random access;
  • the sixth sub-information is used to indicate the blind retransmission threshold of MSG3 in four-step random access; and
  • the seventh sub-information is used to indicate the blind
  • the above sub-information can directly or indirectly indicate whether to perform blind retransmission of MSG3.
  • terminals such as UE can monitor the MSG3 blind retransmission indication on the network side, and then perform blind retransmission of MSG3 based on the indication, thereby improving the random access success rate, shortening the random access time, reducing the random access resource occupancy, and thus reducing the power consumption of the terminal.
  • the first information may be indicated by a system message; or, the first information may be indicated by an information element (IE), wherein the IE is used to configure four-step random access process parameters or two-step random access process parameters; or, the first information may be indicated by a medium access control layer control element (MAC CE).
  • IE information element
  • MAC CE medium access control layer control element
  • the second aspect of the present application provides a random access method.
  • the method can be executed by a second device.
  • the second device can be a terminal.
  • the first information can be obtained, and the first information corresponds to the blind retransmission information of MSG3 in random access.
  • the first information includes at least one of the following sub-information: first sub-information, second sub-information, third sub-information, fourth sub-information, fifth sub-information, sixth sub-information or seventh sub-information.
  • the first sub-information is used to indicate whether to perform blind retransmission of MSG3 in random access
  • the second sub-information is used to indicate whether to perform blind retransmission of MSG3 in four-step random access
  • the third sub-information is used to indicate whether to perform blind retransmission of MSG3 in two-step random access
  • the fourth sub-information is used to indicate whether to perform blind retransmission of MSG3 in four-step random access and whether to perform blind retransmission of MSG3 in two-step random access
  • the fifth sub-information is used to indicate the blind retransmission threshold of MSG3 in random access
  • the sixth sub-information is used to indicate the blind retransmission threshold of MSG3 in four-step random access
  • the seventh sub-information is used to indicate the blind retransmission threshold of MSG3 in two-step random access. value.
  • the method obtains the first information, specifically the sub-information in the first information that directly or indirectly indicates whether to retransmit MSG3, so that in the case of poor network channel (for example, non-terrestrial network scenario), terminals such as UE can also monitor the MSG3 blind retransmission indication on the network side, and then blindly retransmit MSG3 based on the indication, thereby improving the random access success rate, shortening the random access time, reducing the random access resource occupancy, and thus reducing the power consumption of the terminal.
  • poor network channel for example, non-terrestrial network scenario
  • the first information may be obtained in the following manner:
  • MAC CE indicates the first information.
  • the method provides multiple ways to obtain the first information, can meet the needs of different businesses or scenarios, and has high availability.
  • the first response when it is known that blind retransmission of MSG3 is required, can also be monitored.
  • the first information when it is known that blind retransmission of MSG3 is required, and the first response can be monitored.
  • the first device can indicate whether to perform blind retransmission of MSG3 by carrying at least one of the first sub-information, the second sub-information, the third information, and the fourth sub-information, and/or the carrying of at least one of the fifth sub-information, the sixth sub-information, and the seventh sub-information.
  • the first response when the first information is obtained, that is, it is known that blind retransmission of MSG3 is required, the first response can be monitored.
  • the first sub-information, the second sub-information, the third information, and the fourth sub-information can respectively indicate whether to perform blind retransmission of MSG3 or not by different indication values (for example, 0, 1 or Boolean values or true, false). Based on this, when the first information includes at least one of the first sub-information, the second sub-information, the third sub-information and the fourth sub-information, and the indication of at least one of the first sub-information, the second sub-information, the third sub-information and the fourth sub-information is yes, it is known that blind retransmission of MSG3 is required, and the first response can be monitored.
  • different indication values for example, 0, 1 or Boolean values or true, false.
  • a timer when monitoring the first response, a timer may be started, and the first response may be monitored during the operation of the timer.
  • the method does not need to stop the random access response window, and does not need to modify the stop condition of the random access response window, and has high usability.
  • random access may be divided into four-step random access and two-step random access.
  • a first timer may be started, and a first response may be monitored during the operation of the first timer.
  • a second timer may be started, and a first response may be monitored during the operation of the second timer.
  • the method can ensure the timeliness and accuracy of monitoring by respectively setting timers for four-step random access and two-step random access to monitor the first response of the corresponding random access process.
  • the first response includes a first random access response and/or a first fallback random access response.
  • the first response may include a first random access response.
  • the first response may include a first fallback random access response.
  • the method implements blind retransmission of MSG3 in a four-step random access scenario or blind retransmission of MSG3 in a two-step random access scenario by monitoring the first random access response or the first fallback random access response.
  • the first information includes at least one of the fifth sub-information, the sixth sub-information and the seventh sub-information.
  • the count result of the retransmission counter is updated.
  • the count result of the retransmission counter is greater than or equal to the blind retransmission threshold (or the blind retransmission threshold plus 1), it is determined that the first response is successfully received.
  • it is also possible to stop monitoring the first response for example, by stopping the timer, thereby stopping monitoring the response.
  • the method defines a new variable, namely a retransmission counter, and counts the number of times the first response is monitored based on the retransmission counter, so as to determine whether the first response is received successfully, and further control the monitoring of the first response.
  • the retransmission counter includes a first retransmission counter applied to the four-step random access.
  • the count result of the first retransmission counter is less than the blind retransmission threshold (or the blind retransmission threshold plus 1)
  • the count result of the first retransmission counter is updated.
  • the count result of the first retransmission counter is greater than or equal to the blind retransmission threshold (or the blind retransmission threshold plus 1), it is determined that the first response is received successfully.
  • the method defines a new variable, namely a first retransmission counter, for four-step random access, and counts the number of times a first response is monitored based on the first retransmission counter, so as to determine whether the first response is received successfully, thereby controlling the monitoring of the first response of the four-step random access.
  • the retransmission counter includes a second retransmission counter applied to two-step random access.
  • the count result of the second retransmission counter is less than the blind retransmission threshold (or the blind retransmission threshold plus 1)
  • the count result of the second retransmission counter is updated.
  • the count result of the second retransmission counter is greater than or equal to the blind retransmission threshold (or the blind retransmission threshold plus 1), it is determined that the first response is received successfully.
  • the method defines a new variable, namely a second retransmission counter, for two-step random access, and counts the number of times the first response is monitored based on the second retransmission counter, so as to determine whether the first response is received successfully, and further control the monitoring of the first response of the two-step random access.
  • the first response when the timer times out, the first response may be stopped from being monitored, thereby reducing unnecessary power consumption.
  • the timer times out it is also possible to identify whether the response is successfully received, thereby deciding whether to continue the random access process. Specifically, when the count result of the retransmission counter is less than the blind retransmission threshold (or the blind retransmission threshold plus 1), or the number of responses corresponding to the preamble used for random access is less than the blind retransmission threshold, it indicates that the response reception is unsuccessful, and the count result of the preamble transmission counter can be updated, and when the count result of the preamble transmission counter is less than or equal to the maximum number of preamble transmissions, the random access resource is reselected. Alternatively, when the count result of the retransmission counter is greater than or equal to the blind retransmission threshold (or the blind retransmission threshold plus 1), it indicates that the response is successfully received, and the random access process can be terminated.
  • This method provides processing logic when the timer times out, improves the blind retransmission mechanism of MSG3, and can meet business needs.
  • the timer times out it can be determined whether the count result of the retransmission counter is less than the blind retransmission threshold (or the blind retransmission threshold plus 1), or whether the random access preamble code corresponding to the retransmission counter is received. Whether the number of responses is less than the blind retransmission threshold (or the blind retransmission threshold plus 1). If so, the count result of the preamble transmission counter is updated, and when the count result of the preamble transmission counter is less than or equal to the maximum number of preamble transmissions, the random access resource is reselected. Otherwise, the random access process is terminated. In this way, the processing under the condition of timer timeout can be realized, and the blind retransmission mechanism of MSG3 can be improved.
  • a second response may also be monitored in the random access response window to determine whether the second response is a medium access control MAC data packet including only a preamble identifier RAPID; if not, determine whether the first information is obtained.
  • the second response includes only RAPID, indicating that the random access is completed.
  • the second response also includes other information, indicating that the random access is not completed and the random access process can be continued.
  • the method avoids the waste of resources and power consumption caused by continuing to perform monitoring and other processes when the random access is completed by identifying whether the random access is completed.
  • the method identifies whether the random access is completed by determining whether the random access is contention-based random access, thereby avoiding resource waste and power consumption caused by continuing to perform monitoring and other processes when the random access is completed.
  • the first response includes at least one of the first sub-information, the second sub-information, the third sub-information, and the fourth sub-information, and/or at least one of the fifth sub-information, the sixth sub-information, and the seventh sub-information. In this way, it is possible to indicate in the first response whether to perform blind retransmission of MSG3 and/or indicate a blind retransmission threshold, thereby avoiding additional overhead.
  • the second response includes at least one of the first sub-information, the second sub-information, the third sub-information, and the fourth sub-information, at least one of the fifth sub-information, the sixth sub-information, and the seventh sub-information, and/or at least one of the spare bits. In this way, it is possible to indicate in the second response whether to perform blind retransmission of MSG3 and/or indicate a blind retransmission threshold, thereby avoiding additional overhead.
  • the first response and the second response have the same format, which can reduce the complexity of response implementation.
  • the first response and the second response have different formats, so the first response or the second response can be identified by identifying the response format, thereby improving the response monitoring efficiency.
  • the third aspect of the present application provides a random access method.
  • the method includes:
  • the first information includes at least one of the following sub-information:
  • the first sub-information is used to indicate whether to perform blind retransmission of the third message in random access
  • the second sub-information is used to indicate whether to perform blind retransmission of the third message in the four-step random access
  • the third sub-information is used to indicate whether to perform blind retransmission of the third message in the two-step random access
  • the fourth sub-information is used to indicate whether to perform blind retransmission of the third message in the four-step random access and whether to perform blind retransmission of the third message in the two-step random access;
  • the fifth sub-information is used to indicate a blind retransmission threshold of the third message in random access
  • the sixth sub-information is used to indicate a blind retransmission threshold of the third message in the four-step random access
  • the seventh sub-information is used to indicate a blind retransmission threshold of the third message in the two-step random access
  • the first information includes at least one of the first sub-information, the second sub-information, the third sub-information and the fourth sub-information, and the indication of at least one of the first sub-information, the second sub-information, the third sub-information and the fourth sub-information is yes, listen for the first response; or, when the first information is obtained, listen for the first response.
  • indicating the first information includes:
  • the first information is indicated by an information element IE, where the IE is used to configure a four-step random access process parameter or a two-step random access process parameter; or,
  • the first information is indicated by the medium access control layer control element MAC CE.
  • monitoring the first response includes:
  • monitoring the first response includes:
  • a second timer is started, and a first response is monitored during the running of the second timer.
  • the first information includes at least one of the fifth sub-information, the sixth sub-information, and the seventh sub-information, and after monitoring the first response, the method further includes:
  • the count result of the retransmission count counter is less than the blind retransmission threshold (or the blind retransmission threshold plus 1), the count result is updated; or,
  • the count result of the retransmission count counter is greater than or equal to the blind retransmission threshold (or the blind retransmission threshold plus 1), it is determined that the first response is received successfully.
  • the retransmission count counter includes a first retransmission count counter applied to four-step random access, and the method includes:
  • the count result of the first retransmission counter is less than the blind retransmission threshold (or the blind retransmission threshold plus 1), the count result of the first retransmission counter is updated; or,
  • the count result of the first retransmission count counter is greater than or equal to the blind retransmission threshold (or the blind retransmission threshold plus 1), it is determined that the first response is received successfully.
  • the retransmission count counter includes a second retransmission count counter applied to two-step random access, and the method includes:
  • the count result of the second retransmission counter is less than the blind retransmission threshold (or the blind retransmission threshold plus 1), the count result of the second retransmission counter is updated; or,
  • the count result of the second retransmission count counter is greater than or equal to the blind retransmission threshold (or the blind retransmission threshold plus 1), it is determined that the first response is received successfully.
  • the method further includes:
  • the method when the timer times out, the method further includes:
  • the count result of the retransmission number counter is less than the first threshold, or the number of responses corresponding to the random access preamble is less than the first threshold, the count result of the preamble transmission counter is updated, and when the count result of the preamble transmission counter is less than or equal to the maximum number of preamble transmissions, the random access resource is reselected; or,
  • the random access process is terminated.
  • the method further includes:
  • a second response is monitored in the random access response window, and it is determined whether the second response is a medium access control MAC data packet including only a preamble identifier RAPID; if not, it is determined whether the first information is acquired.
  • the method further includes:
  • the first response includes at least one item of the first sub-information, the second sub-information, the third sub-information, and the fourth sub-information, and/or at least one item of the fifth sub-information, the sixth sub-information, and the seventh sub-information.
  • the second response includes at least one item of the first sub-information, the second sub-information, the third sub-information, and the fourth sub-information, at least one item of the fifth sub-information, the sixth sub-information, and the seventh sub-information, and/or at least one item of the spare bits.
  • a fourth aspect of the present application provides a random access method, the method comprising:
  • the first device indicates first information, where the first information corresponds to blind retransmission information of a third message in random access;
  • the first information includes at least one of the following sub-information:
  • the first sub-information is used to indicate whether to perform blind retransmission of the third message in random access
  • the second sub-information is used to indicate whether to perform blind retransmission of the third message in the four-step random access
  • the third sub-information is used to indicate whether to perform blind retransmission of the third message in the two-step random access
  • the fourth sub-information is used to indicate whether to perform blind retransmission of the third message in the four-step random access and whether to perform blind retransmission of the third message in the two-step random access;
  • the fifth sub-information is used to indicate a blind retransmission threshold of the third message in random access
  • the sixth sub-information is used to indicate a blind retransmission threshold of the third message in the four-step random access
  • the seventh sub-information is used to indicate a blind retransmission threshold of the third message in the two-step random access
  • the second device listens for the first response; or, when the first information is obtained, the second device listens for the first response.
  • the first device indicates the first information, including:
  • the first device indicates the first information through a system message; or,
  • the first device indicates the first information through an information element IE, where the IE is used to configure a four-step random access process parameter or a two-step random access process parameter; or,
  • the first device indicates the first information through the media access control layer control element MAC CE.
  • the method further includes:
  • the second device monitors the first response; or,
  • the second device monitors the first response.
  • the second device monitors the first response, including:
  • the second device starts a timer and monitors the first response while the timer is running.
  • the second device monitors the first response, including:
  • the second device starts a first timer and listens for a first response during the running of the first timer; or,
  • the second device starts a second timer and listens for the first response while the second timer is running.
  • the first information includes at least one of the fifth sub-information, the sixth sub-information, and the seventh sub-information
  • the second device monitors the first response
  • the method further includes:
  • the second device updates the count result
  • the second device determines that the first response is received successfully.
  • the retransmission count counter includes a first retransmission count counter applied to four-step random access, and the method includes:
  • the second device updates the count result of the first retransmission counter
  • the second device determines that the first response is received successfully.
  • the retransmission count counter includes a second retransmission count counter applied to two-step random access, and the method includes:
  • the second device updates the count result of the second retransmission counter; or,
  • the second device determines that the first response is received successfully.
  • the method further includes:
  • the second device stops listening to the first response.
  • the method when the timer times out, the method further includes:
  • the count result of the retransmission number counter is less than the first threshold, or the number of responses corresponding to the random access preamble is less than the first threshold, the count result of the preamble transmission counter is updated, and when the count result of the preamble transmission counter is less than or equal to the maximum number of preamble transmissions, the random access resource is reselected; or,
  • the random access process is terminated.
  • the method further includes:
  • the second device determines whether the second response is a medium access control MAC data packet including only a preamble identifier RAPID, and if not, the second device determines whether the first information is obtained.
  • the method further includes:
  • the second device determines whether the random access is contention-based random access, and if so, the second device determines whether the first information is acquired.
  • the first response includes at least one item of the first sub-information, the second sub-information, the third sub-information, and the fourth sub-information, and/or at least one item of the fifth sub-information, the sixth sub-information, and the seventh sub-information.
  • the second response includes at least one item of the first sub-information, the second sub-information, the third sub-information, and the fourth sub-information, at least one item of the fifth sub-information, the sixth sub-information, and the seventh sub-information, and/or at least one item of the spare bits.
  • the fifth aspect of the present application provides an electronic device, including: a memory and at least one processor.
  • the memory is used to store a program
  • the at least one processor is used to run the program, so that the electronic device implements the random access method provided in the first aspect or the second aspect of the present application.
  • the sixth aspect of the present application provides a communication system, including a first device and a second device, where the first device and the second device are used to implement the random access method provided in the third aspect or the fourth aspect of the present application.
  • the seventh aspect of the present application is a computer storage medium for storing a computer program, which, when executed, is used to implement the random access method provided in the second aspect or the third aspect of the present application.
  • FIG1 is an example diagram of a scenario of communication between a base station and a terminal disclosed in an embodiment of the present application
  • FIG2 is a flowchart of a four-step random access disclosed in an embodiment of the present application.
  • FIG3 is a flowchart of a two-step random access fallback disclosed in an embodiment of the present application.
  • FIG4 is a time axis of a random access disclosed in an embodiment of the present application.
  • FIG5 is a flow chart of a random access method disclosed in an embodiment of the present application.
  • FIG6 is a flowchart of monitoring a first response in a random access method disclosed in an embodiment of the present application.
  • FIG7 is a schematic diagram of a pre-processing flow of a random access method disclosed in an embodiment of the present application.
  • FIG8 is a schematic diagram of a post-processing flow of a random access method disclosed in an embodiment of the present application.
  • FIG9 is a schematic diagram of a post-processing flow of another random access method disclosed in an embodiment of the present application.
  • FIG10 is a flow chart of another random access method disclosed in an embodiment of the present application.
  • FIGS. 11A to 11C are schematic diagrams of the structure of an initial random access response RAR disclosed in an embodiment of the present application.
  • 12A to 12C are schematic diagrams of the structure of a subsequent random access response RAR disclosed in an embodiment of the present application.
  • FIG13A is a flowchart of a random access method in a four-step random access scenario disclosed in an embodiment of the present application
  • FIG13B is a timeline of a four-step random access disclosed in an embodiment of the present application.
  • FIG14A is a flowchart of a random access method in a two-step random access scenario disclosed in an embodiment of the present application
  • FIG14B is a timeline of a two-step random access disclosed in an embodiment of the present application.
  • FIG15 is a structural diagram of an electronic device disclosed in an embodiment of the present application.
  • FIG. 16 is a structural diagram of another electronic device disclosed in an embodiment of the present application.
  • one or more refers to one, two or more; “and/or” describes the association relationship of associated objects, indicating that it can There are three types of relationships; for example, A and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural.
  • the character “/” generally indicates that the objects before and after are in an "or” relationship.
  • references to "one embodiment” or “some embodiments” etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application.
  • the phrases “in one embodiment”, “in some embodiments”, “in some other embodiments”, “in some other embodiments”, etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean “one or more but not all embodiments", unless otherwise specifically emphasized in other ways.
  • the terms “including”, “comprising”, “having” and their variations all mean “including but not limited to”, unless otherwise specifically emphasized in other ways.
  • the communication system includes a first device and a second device.
  • the first device may be a device on the network side for providing network communication functions, which may also be referred to as a network device or a network element in some cases.
  • the network device may generally be a base station, a functional unit of a base station, or a combination of functional units of a base station.
  • the second device may be a device for accessing the network, which may generally be a terminal.
  • FIG1 An example of a communication system is shown in FIG1 , which includes a base station 1 and a terminal 2.
  • the communication system includes network equipment and terminals.
  • the network equipment is a device used by the network side to provide network communication functions, which is also called a network element in some cases.
  • the network equipment can generally be a base station, a functional unit of a base station, or a combination of functional units of a base station.
  • An example of a communication system is shown in Figure 1, which includes a base station 1 and a terminal 2.
  • the base station may be any device with wireless transceiver functions, including but not limited to: an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in long term evolution (LTE), a base station (gNodeB or gNB) or a transmission receiving point (transmission receiving point/transmission reception point, TRP) in new radio (NR), a base station of subsequent evolution of 3GPP, an access node in a Wi-Fi system, a wireless relay node, a wireless backhaul node, etc.
  • the base station may be: a macro base station, a micro base station, a pico base station, a small station, a relay station, or a balloon station, etc.
  • the base station may include one or more co-sited or non-co-sited transmission points (Transmission Reception Point, TRP).
  • TRP Transmission Reception Point
  • the base station may also be a wireless controller, a centralized unit (CU), and/or a distributed unit (DU) in a cloud radio access network (CRAN) scenario.
  • the base station can communicate with the terminal or communicate with the terminal through a relay station.
  • the terminal can communicate with multiple base stations of different technologies. For example, the terminal can communicate with a base station supporting the LTE network or a base station supporting the 5G network, or can establish dual connections with a base station supporting the LTE network and a base station supporting the 5G network.
  • the terminal may be in various forms, for example, a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a vehicle-mounted terminal device, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a wearable terminal device, etc.
  • VR virtual reality
  • AR augmented reality
  • the terminal may also be sometimes referred to as a terminal device, a user equipment (UE), an access terminal device, a vehicle-mounted terminal, an industrial control terminal, a UE unit, a UE station, a mobile station, a mobile station, a remote station, a remote terminal device, a mobile device, a UE terminal ... Terminal equipment, terminal equipment, wireless communication equipment, UE agent or UE device, etc.
  • the terminal may also be a fixed terminal or a mobile terminal.
  • a wireless link is established between the terminal 2 and the base station 1 on the network side. Data interaction through the wireless link usually requires random access. Random access refers to the process from the time a user sends a random access preamble (also referred to as preamble) through the Physical Random Access Channel (PRACH) to try to access the network to the time a basic signaling connection is established with the network.
  • a random access preamble also referred to as preamble
  • PRACH Physical Random Access Channel
  • PRACH is the access channel when terminal 2 starts to initiate a call. After terminal 2 receives the random access response message from the network device, the terminal will send a radio resource control (RRC) connection request message on the PRACH channel according to the information indicated by the network device to establish an RRC connection.
  • RRC radio resource control
  • a PRACH can contain a preamble.
  • the preamble is a Zadd Off Chu (ZC) sequence with a length of L_RA: ⁇ x(0), x(1), ... x(L_RA-1) ⁇ .
  • ZC Zadd Off Chu
  • the preamble can be divided into two categories: long preamble and short preamble.
  • the long preamble is divided into four formats (format), namely: format0, format1, format2 and format3; the short preamble is divided into nine types, namely: A1, A2, A3, B1, B2, B3, B4, C0 and C2.
  • format namely: format0, format1, format2 and format3
  • the short preamble is divided into nine types, namely: A1, A2, A3, B1, B2, B3, B4, C0 and C2.
  • a preamble consists of a cyclic prefix (CP), a preamble sequence, and a free guard period.
  • CP cyclic prefix
  • FIG2 shows a random access process, and FIG2 uses a four-step random access example for explanation.
  • terminal 2 sends a first message (denoted as MSG1) to base station 1 through PRACH, wherein the first message indicates that there is a preamble used for this random access.
  • the first message may carry a random access preamble identifier (RAPID), wherein RAPID may also be referred to as a preamble identifier, which is used to indicate the preamble identifier used for this random access.
  • RAPID may occupy at least one bit, for example, RAPID may occupy 6 bits, and accordingly, the value range of RAPID may be 0 to 63 (including the endpoint value).
  • Base station 1 may blindly detect the preamble in PRACH. If the preamble is detected, the second message (denoted as MSG2) may be fed back through the physical downlink shared channel (PDSCH) within the random access response window, specifically a random access response (RAR).
  • PDSCH physical downlink shared channel
  • RAR random access response
  • RAR may include: the preamble in MSG1 (for terminal 2 to match the operation), the uplink timing advance (TA) of terminal 2, the backoff parameter (the time to delay re-access after re-initiating the preamble code), the physical uplink shared channel (PUSCH) scheduling information UL_Grant allocated for transmitting the third message (denoted as MSG3) (including whether to perform frequency hopping, modulation and coding rate, access resources and access time, etc.), and Temple C-RNTI (for MSG3 scrambling).
  • TA uplink timing advance
  • PUSCH physical uplink shared channel
  • Terminal 2 can obtain uplink synchronization according to TA in RAR, and transmit the third message MSG3 in the uplink resources allocated to it by base station 1 for subsequent data transmission.
  • MSG3 can carry an RRC connection request (RRC Connection Request) or an RRC connection re-establishment request (RRC Connection Re-establishment Request). Therefore, the third message is also called a scheduled transmission message.
  • Base station 1 sends a fourth message (denoted as MSG4) to terminal 2 through downlink resources, which is specifically a contention resolution message.
  • terminal 2 can open the RAR window to monitor RAR after sending MSG1.
  • RAR window can be stopped and MSG3 can be sent.
  • MSG3 can be sent.
  • sending MSG3 contention resolution can be opened. If a contention resolution message, namely MSG4, is monitored within the time range of the contention resolution window, the random access process ends.
  • FIG3 shows a simplified random access process, which is a two-step random access process.
  • terminal 2 sends message A (referred to as message A, abbreviated as MSGA) to base station 1 via PRACH.
  • message A referred to as message A, abbreviated as MSGA
  • MSGA includes a random access preamble and a physical uplink shared channel payload PUSCH payload, which is equivalent to sending MSG1 and MSG3 of four-step random access in a package.
  • base station 1 can send message B (referred to as message B, abbreviated as MSGB) to terminal 2.
  • message B abbreviated as MSGB
  • MSGB is the response of the network side to the MSGA sent by terminal 2.
  • the content of MSGB depends on whether base station 1 can successfully detect the preamble and PUSCH payload carried by PRACH. If base station 1 detects the preamble and PUSCH payload and decodes successfully, base station 1 can include a success RAR in MSGB to complete contention resolution; if base station 1 detects the preamble but does not detect the PUSCH payload or the PUSCH payload decoding fails, base station 1 can include a fallback indication in MSGB, wherein the fallback indication is also called a fallback random access response (fallback RAR), which is used to request terminal 2 to send the PUSCH payload again, for example, to send MSG3 again.
  • fallback RAR fallback random access response
  • base station 1 returns the fallback indication, and then terminal 2 sends a third message MSG3, i.e., a scheduled transmission message, to base station 1, and receives a contention resolution message returned by base station 1.
  • MSG3 i.e., a scheduled transmission message
  • FIG3 illustrates an example of a random access attempt in a two-step random access process, and the two-step random access process may also include multiple random access attempts.
  • Two-step random access reduces the number of interactions between the terminal (such as UE) and the network during connection establishment and connection recovery, thereby reducing the control plane latency of IDLE and INACTIVE UEs.
  • the terminal such as UE
  • the network during connection establishment and connection recovery, thereby reducing the control plane latency of IDLE and INACTIVE UEs.
  • a small amount of data can be sent through the two-step RACH channel, thereby reducing the latency of uplink user plane data for connected mode UEs.
  • the network side (such as base station 1) can perform blind scheduling of MSG3.
  • RAR including RAR of four-step random access or fallback RAR of two-step random access
  • blind scheduling of MSG3 means continuously sending RAR (such as RAR of four-step random access or fallback RAR of two-step random access) without receiving MSG3.
  • the terminal can retransmit MSG3. Therefore, blind scheduling of MSG3 can also be called blind retransmission of MSG3.
  • the blind retransmission process is described by taking the non-terrestrial network (NTN) scenario as an example.
  • NTN non-terrestrial network
  • HAP high-altitude platforms
  • the round-trip delay (RTT) of data transmission is relatively large.
  • the round-trip delay of data transmission in the NTN scenario can reach dozens or even hundreds of times the round-trip delay of data transmission in the terrestrial network (TN) scenario.
  • TN terrestrial network
  • ms milliseconds
  • the UE may not open the RAR window immediately after sending the first message MSG1, but open the RAR window after a round-trip delay RTT, and at the same time, after sending the third MSG3, the contention resolution window is opened after a round-trip delay.
  • the base station and other network devices on the network side continuously send RAR to schedule MSG3 without receiving MSG3, instructing the UE to retransmit MSG3. Opening the RAR window after a long RTT may cause the UE side to be unable to monitor the initial scheduling of MSG3.
  • the initial RAR can be regarded as the initial scheduling of MSG3
  • PDCCH physical downlink control channel
  • the present application provides a random access method.
  • the method indicates first information, which corresponds to blind retransmission information of a third message in random access, and may include at least one of the following sub-information: first sub-information, second sub-information, third sub-information, fourth sub-information, fifth sub-information, sixth sub-information, and seventh sub-information.
  • the first sub-information is used to indicate whether to perform blind retransmission of the third message in random access
  • the second sub-information is used to indicate whether to perform the second sub-information of blind retransmission of the third message in four-step random access
  • the third sub-information is used to indicate whether to perform the third sub-information of blind retransmission of the third message in two-step random access
  • the fourth sub-information is used to indicate whether to perform the blind retransmission of the third message in two-step random access
  • the fifth sub-information is used to indicate the blind retransmission threshold (or blind scheduling threshold, indicating the maximum number of retransmissions or the maximum number of scheduling) of the third message in random access
  • the sixth sub-information is used to indicate the blind retransmission threshold of the third message in four-step random access
  • the seventh sub-information is used to indicate the blind retransmission threshold of the third message in two-step random access.
  • the fifth sub-information may also implicitly indicate the blind retransmission of the third message in random access
  • the sixth sub-information may also implicitly indicate the blind retransmission of the third message in four-step random access
  • the seventh sub-information may also implicitly indicate the blind retransmission of the third message in two-step random access.
  • terminals such as UE can monitor the MSG3 blind retransmission indication on the network side, and then perform blind retransmission of MSG3 based on the indication, thereby improving the random access success rate, shortening the random access time, reducing the random access resource occupancy, and thus reducing the power consumption of the terminal.
  • FIG5 is a random access method disclosed in an embodiment of the present application.
  • the process shown in FIG5 includes the following steps:
  • the second device may be a terminal.
  • the first information may be indicated by the first device.
  • the first device may be a network device, and the network device may be a base station.
  • the first information may also be configured or issued by a high layer (e.g., an application layer) of the second device, that is, the second device acquires the first information by itself.
  • the second device may report the first information to the first device so that the second device may be aware of the first information.
  • the first information corresponds to the blind retransmission information of the third message MSG3 in random access.
  • Blind retransmission of MSG3 means that the network side (such as a base station or other network equipment) continuously sends RAR without receiving MSG3 to instruct the terminal side to retransmit MSG3.
  • the retransmission of MSG3 exists in the following random access processes: four-step random access; two-step random access (specifically, the random access process when the network side fails to successfully receive the PUSCH payload and sends a fallback RAR to the terminal side). Accordingly, the blind retransmission of MSG3 can be applied to the following scenarios: contention-based four-step random access; MSGB includes a fallback RAR two-step random access. Considering that a random access process can include multiple random access attempts, the four-step random access can include a four-step random access attempt after switching in the two-step random access process.
  • the first information may include at least one of the following sub-information: first sub-information, second sub-information, third sub-information, fourth sub-information, fifth sub-information, sixth sub-information or seventh sub-information.
  • the above sub-information may directly or indirectly indicate to perform blind retransmission of MSG3 or not to perform blind retransmission of MSG3.
  • the first sub-information is used to indicate whether to perform blind retransmission of MSG3 in random access.
  • the first sub-information indicates that blind retransmission of MSG3 in random access is performed, which can be regarded as indicating that blind retransmission of MSG3 is performed in both four-step random access (for example, contention-based four-step random access) and two-step random access (for example, two-step random access of MSGB including fallback RAR). Further, the first sub-information indicates that blind retransmission of MSG3 in random access is not performed, which can be regarded as not performing blind retransmission of MSG3 in both the above-mentioned four-step random access and two-step random access.
  • the first sub-information is only applied to four-step random access
  • the content indicated by the first sub-information is only applied to four-step random access, that is, blind retransmission of MSG3 is performed in four-step random access or blind retransmission of MSG3 is not performed in four-step random access
  • the first sub-information is only applied to two-step random access
  • the content indicated by the first sub-information is only applied to two-step random access, that is, blind retransmission of MSG3 is performed in two-step random access or blind retransmission of MSG3 is not performed in two-step random access.
  • the second sub-information is used to indicate whether to perform blind retransmission of MSG3 in four-step random access, for example, blind retransmission of MSG3 in contention-based four-step random access.
  • the second sub-information indicates to perform blind retransmission of MSG3 in four-step random access, which can be regarded as indicating to perform blind retransmission of MSG3 in four-step random access.
  • the second sub-information indicates not to perform blind retransmission of MSG3 in random access, which can be regarded as not to perform blind retransmission of MSG3 in the above-mentioned four-step random access.
  • the third sub-information is used to indicate whether to perform blind retransmission of MSG3 in two-step random access, for example, blind retransmission of MSG3 in two-step random access in which MSGB includes fallback RAR.
  • the second sub-information indicates to perform blind retransmission of MSG3 in two-step random access, which can be regarded as indicating to perform blind retransmission of MSG3 in two-step random access.
  • the second sub-information indicates not to perform blind retransmission of MSG3 in two-step random access, which can be regarded as not to perform blind retransmission of MSG3 in the above-mentioned two-step random access.
  • the fourth sub-information is used to indicate whether to perform blind retransmission of MSG3 in four-step random access and whether to perform blind retransmission of MSG3 in two-step random access.
  • the fourth sub-information may include multiple indication contents, the first indication content is used to indicate whether to perform blind retransmission of MSG3 in four-step random access, and the second indication content is used to indicate whether to perform blind retransmission of MSG3 in two-step random access.
  • the difference between the fourth sub-information and the first information is that the fourth sub-information can not only indicate that both two-step random access and four-step random access perform blind retransmission or neither performs blind retransmission, but also indicate that two-step random access performs blind retransmission and four-step random access does not perform blind retransmission, or that four-step random access performs blind retransmission and two-step random access does not perform blind retransmission.
  • the fourth sub-information may be represented by multiple bits or by a bitmap. When represented by bits or a bitmap, the data structure of the fourth sub-information is a bit string with a size of 2, represented as BIT STRING (SIZE (2)).
  • bit when the bit is set to 1, it can be a "yes” situation, and when the bit is set to 0, it can be a "no” situation. In another implementation, when the bit is set to 1, it can be a "no” situation, and when the bit is set to 0, it can be a "yes” situation.
  • the first bit of the bit string indicates whether to perform blind retransmission of MSG3 in four-step random access.
  • bit When the bit is set to 1, it refers to the "yes” case, that is, blind retransmission of MSG3 in four-step random access is performed; when the bit is set to 0, it refers to the "no” case, that is, blind retransmission of MSG3 in four-step random access is not performed; the second bit indicates whether to perform blind retransmission of MSG3 in two-step random access.
  • bit When the bit is set to 1, it refers to the "yes” case, that is, blind retransmission of MSG3 in two-step random access is performed; when the bit is set to 0, it refers to the "no” case, that is, blind retransmission of MSG3 in two-step random access is not performed.
  • the first bit of the bit string indicates whether to perform blind retransmission of MSG3 in two-step random access.
  • bit refers to the "yes” case, that is, the blind retransmission of MSG3 in two-step random access is performed.
  • bit refers to the "no” case, that is, the blind retransmission of MSG3 in two-step random access is not performed.
  • the second bit indicates whether to perform blind retransmission of MSG3 in four-step random access.
  • the bit is set to 1, it means “yes”, that is, blind retransmission of MSG3 in four-step random access is performed.
  • bit is set to 0, it means “no”, that is, blind retransmission of MSG3 in four-step random access is not performed.
  • the fifth sub-information is used to indicate the blind retransmission threshold of MSG3 in random access.
  • the blind retransmission threshold may indicate the maximum number of retransmissions in the blind retransmission process.
  • the fifth sub-information may indicate a blind retransmission threshold (in this case, two-step random access and four-step random access may share), and the fifth sub-information may also indicate two blind retransmission thresholds, including the blind retransmission threshold of MSG3 in four-step random access and the blind retransmission threshold of MSG3 in two-step random access.
  • the fifth sub-information When it is stated that the fifth sub-information is only applied to four-step random access, the content indicated by the fifth sub-information is only applied to four-step random access, that is, the fifth sub-information indicates the blind retransmission threshold of MSG3 in four-step random access; when it is stated that the fifth sub-information is only applied to two-step random access, the content indicated by the fifth sub-information is only applied to two-step random access, that is, the fifth sub-information indicates the blind retransmission threshold of MSG3 in two-step random access.
  • the sixth sub-information is used to indicate a blind retransmission threshold of MSG3 in four-step random access.
  • the sixth sub-information may indicate a blind retransmission threshold, which is applied to the four-step random access.
  • the sixth sub-information may include a blind retransmission threshold applied to the four-step random access.
  • the sixth sub-information may include a four-step random access threshold parameter, based on which the blind retransmission threshold applied to the four-step random access may be determined.
  • the seventh sub-information is used to indicate a blind retransmission threshold of MSG3 in two-step random access.
  • the seventh sub-information may indicate a blind retransmission threshold, which is applied to the two-step random access.
  • the seventh sub-information may include a blind retransmission threshold applied to the two-step random access.
  • the seventh sub-information may include a two-step random access threshold parameter, based on which the blind retransmission threshold applied to the two-step random access may be determined.
  • the fifth, sixth and seventh sub-information implicitly indicate blind retransmission of MSG3.
  • the fifth sub-information indirectly indicates blind retransmission of MSG3.
  • the fifth sub-information indirectly indicates blind retransmission of MSG3 in both four-step random access and two-step random access
  • the sixth sub-information indirectly indicates blind retransmission of MSG3 in four-step random access
  • the seventh sub-information indirectly indicates blind retransmission of MSG3.
  • the second device may obtain the first information through a system message, obtain the first information through an information element IE, or obtain the first information through a MAC CE.
  • the second device may read at least one of the system message, the IE or the MAC CE to obtain the first information.
  • the second device may read at least one of the system message, the IE or the MAC CE to obtain the parameter for determining the first information, and then obtain the first information based on the parameter.
  • System messages may include but are not limited to system information blocks (SIBs), such as SIB1.
  • SIBs system information blocks
  • the system message may indicate at least one of the first sub-information, the second sub-information, the third sub-information, the fourth sub-information, the fifth sub-information, the sixth sub-information or the seventh sub-information.
  • the information element IE is used to configure the parameters of the random access process. Further, the information element can be divided into an information element for configuring the parameters of the four-step random access process (referred to as RACH-ConfigCommon) and an information element for configuring the parameters of the two-step random access process (referred to as RACH-ConfigCommonTwoStepRA). In other words, the information element can be used
  • RACH-ConfigCommon may indicate at least one of the first sub-information, the second sub-information, the fifth sub-information or the sixth sub-information
  • the information element RACH-ConfigCommon may indicate at least one of the first sub-information, the third sub-information, the fifth sub-information or the seventh sub-information.
  • MAC CE may include RAR in four-step random access or fallback RAR in two-step random access. Wherein, when MAC CE includes RAR in four-step random access, MAC CE may indicate at least one of the first sub-information, the second sub-information, the fifth sub-information or the sixth sub-information; when MAC CE includes fallback RAR in two-step random access, MAC CE may indicate at least one of the first sub-information, the third sub-information, the fifth sub-information or the seventh sub-information.
  • the first information can also be obtained by the second device.
  • the second device can obtain the target power.
  • RSRP reference signal received power
  • the second device can also report the first information so that the first device can know the first information.
  • the second device can report through the MSG1 message.
  • the first device can receive the MSG1 message sent by the second device, and know the RSRP of the second device by evaluating the link, so the first information can be known.
  • the indication content of the sub-information in the above-mentioned first information can be for the terminal or for the cell.
  • the blind retransmission of MSG3 in the embodiment of the present application can be based on the blind retransmission of MSG3 of the terminal, or based on the blind retransmission of MSG3 of the cell.
  • the reference signal received power (RSRP) of the terminals in the NTN cell is slightly different, for example, it is less than the target power.
  • the network side such as base stations and other network equipment
  • the network side can perform blind scheduling of MSG3 on the terminals in the NTN cell.
  • the network side can instruct the terminals in the NTN cell to perform blind retransmission of MSG3 through the first information.
  • This step can be performed by the second device.
  • the second device can be a terminal.
  • the second device when the second device obtains the above-mentioned first information, that is, when the second device learns the above-mentioned first information (for example, the first information indicating the blind retransmission of MSG3 in the random access process), the second device will perform monitoring of the first response.
  • the second device can also perform blind retransmission of MSG3 based on its own knowledge. For example, if the RSRP measured by the second device is less than the target power, the second device learns that blind retransmission of MSG3 is required, and the second device can perform monitoring of the first response.
  • the first sub-information, the second sub-information, the third sub-information, the fourth sub-information, the fifth sub-information, the sixth sub-information, and the seventh sub-information are optional.
  • the first device can indicate whether to perform blind retransmission of MSG3 through the carrying status of at least one of the first sub-information, the second sub-information, the third information, and the fourth sub-information, and/or the carrying status of at least one of the fifth sub-information, the sixth sub-information, and the seventh sub-information.
  • the first information carries at least one of the above sub-information, for example, includes a flag bit of at least one sub-information, it indicates to perform blind retransmission of MSG3. Accordingly, the terminal can listen to the first response after obtaining the above first information.
  • the first sub-information, the second sub-information, the third sub-information, and the fourth sub-information may respectively indicate whether to perform blind retransmission of MSG3 or not to perform blind retransmission of MSG3 through different indication values (for example, 0, 1, or Boolean values or true, false). Based on this, when the first information includes at least one of the first sub-information, the second sub-information, the third sub-information, and the fourth sub-information, and the first sub-information, the second sub-information, and the fourth sub-information If at least one of the information, the third sub-information and the fourth sub-information indicates yes, the terminal listens for the first response.
  • terminals such as UE can monitor the MSG3 blind retransmission indication on the network side, and then perform blind retransmission of MSG3 based on the indication, thereby improving the success rate of random access, shortening the random access time, reducing the random access resource occupancy, and thus reducing the power consumption of the terminal.
  • the method comprises the following steps:
  • the above S602 and S604 may be executed by the second device.
  • the second device may be a terminal, which is used to monitor the first response and perform blind retransmission of MSG3.
  • the timer may be set with a start condition.
  • the start condition may be that the second response is monitored in the random response window, and it is known that blind scheduling of MSG3 is required.
  • the second response refers to the initial response, for example, the first response in this random access process, including the first RAR and/or the first fallback RAR.
  • the first response may be a response after the initial response, based on which, the first response is also referred to as a subsequent response.
  • the first response may be the i-th (i is greater than 1) response in this random access, for example, the 2nd response, the 3rd response... the Nth response, including the 2nd RAR, the 3rd RAR... the Nth RAR (collectively referred to as the first RAR) and/or the 2nd fallback RAR, the 3rd fallback RAR... the Nth fallback RAR (collectively referred to as the first fallback RAR).
  • the second device monitors a response in the random access response window, it can identify whether the response is the first response corresponding to the sent preamble or preamble identifier. If so, it means that the second response is monitored; if not, it means that the second response is not monitored. In addition, the second device can also determine whether the first information is obtained. For example, the second device can obtain the first information from the second response and determine whether the first information is obtained. In some examples, the second device obtains the first information and can be informed that blind scheduling of MSG3 is required.
  • the second device obtains the first information, and the first information includes at least one of the first sub-information, the second sub-information, the third sub-information, and the fourth sub-information, and at least one of the indications is yes, and the second device can be informed that blind scheduling of MSG3 is required.
  • the second device can also obtain the RSRP measured by itself. When the RSRP is less than the target power, the second device can be informed that blind scheduling of MSG3 is required.
  • the terminal can start the timer for four-step random access and two-step random access respectively.
  • the terminal can start the first timer, and the terminal can listen to the first response during the operation of the first timer.
  • the first timer can be used to monitor the first RAR or the PDCCH of the first RAR, so the terminal can listen to the first RAR during the operation of the first timer.
  • the terminal can start the second timer, and the terminal can listen to the first response during the operation of the second timer.
  • the second timer is used to monitor the first fallback RAR or the PDCCH of the first fallback RAR, so the terminal can listen to the first fallback RAR during the operation of the second timer.
  • the first response includes the first RAR and/or the first fallback RAR.
  • monitoring the first response can also be achieved by other methods.
  • the second device can also open a new random access response window and monitor the first response in the new random access response window.
  • FIG. 6 may be implemented alone or in combination with other embodiments, and this application does not impose any limitation on this.
  • the second RAR When the second RAR is received, it can also be identified whether the random access is completed. If so, the above S602 and S604 can be omitted. If not, it can be determined whether the first information is obtained, and then the above S602 and S604 are executed when the first information (indicating blind scheduling of MSG3) is obtained.
  • a schematic diagram of a pre-processing flow of a random access method includes the following steps:
  • S702 A second response is monitored in the random access response window, and it is determined whether the second response is a MAC data packet including only RAPID. If not, S703 is executed; if yes, S706 is executed.
  • S702 can be executed by the second device.
  • the second device (such as a terminal such as a UE) can parse the second response (such as an initial RAR) to determine whether the second response is a MAC data packet that includes only RAPID.
  • the second response is a MAC data packet that includes only RAPID, indicating that the random access is completed, and S706 can be executed to end the random access process, and there is no need to execute the process of the embodiment shown in Figure 6.
  • the second response is not a MAC data packet that includes only RAPID.
  • the second response also includes TA and PUSCH scheduling information UL_Grant allocated for the transmission of MSG3 (including whether frequency hopping, modulation coding rate, access resources and access time, etc.), which means that the random access is not completed, and the process of the embodiment shown in Figure 6 can be executed.
  • S703 can also be executed to confirm whether the random access is completed. When the random access is not completed, the process of the embodiment shown in Figure 6 is executed again.
  • S703 Determine whether the random access is contention-based random access. If yes, execute S704; if no, execute S706.
  • S703 can be executed by the second device.
  • the second device (such as a terminal such as a UE) can determine whether the random access is a contention-based random access by whether the preamble used for random access is a contention-based preamble, for example, whether it is a preamble in a contention code resource pool. If so, it means that the random access is not completed, and S704 can be executed, and then when the first information (indicating blind retransmission of MSG3) is obtained, the process of the embodiment shown in Figure 6 is executed. If not, it means that the random access is completed, and S706 can be executed to end the random access process, and there is no need to execute the process of the embodiment shown in Figure 6.
  • the above S703 is an optional step of the embodiment of the present application, and the method of the embodiment of the present application may not execute S703.
  • S704 may be directly executed, and when the execution result of S702 is yes, S706 may be executed.
  • S703 may be executed, and when the execution result of S703 is yes, S704 may be executed.
  • S704 may be executed.
  • S704 Determine whether the first information is acquired.
  • the random access method of the embodiment of the present application may not perform the above-mentioned judgment step.
  • the second device may not perform the step of determining whether the second response is a MAC data packet including only RAPID, and learn that the second response is a MAC data packet including only RAPID by other means, or that the second response is not a MAC data packet including only RAPID.
  • MAC data packet When the second response is not a data packet including only RAPID, it indicates that the random access is not completed, and the subsequent process of random access can be executed. When the second response is a data packet including only RAPID, it indicates that the random access is completed and the random access process can be terminated.
  • the second device may not execute the step of determining whether the random access is a contention-based random access, and learn through other means whether the current random access is a contention-based random access or a non-contention random access.
  • the random access is a contention-based random access, it indicates that the random access is not completed, and the subsequent process of random access can be executed.
  • the random access is a non-contention random access, it indicates that the random access is completed, and the random access process can be terminated.
  • the second device may not execute the step of determining whether the first information is obtained, and the second device may execute the step or process of monitoring the first response when the first information is obtained.
  • the method identifies whether the random access is completed by executing the above random access process, and then executes the process of the embodiment shown in FIG. 6 when the random access is not completed, thereby avoiding resource waste.
  • the embodiment shown in FIG7 can be implemented alone or in combination with other embodiments.
  • the embodiment shown in FIG7 can be implemented alone.
  • the embodiment of FIG7 can also be combined with the embodiment shown in FIG6 or the embodiment shown in FIG5. In some possible implementations, the embodiment of FIG7 can also be combined with subsequent embodiments.
  • FIG. 6 and FIG. 7 introduce the monitoring process and the pre-processing process of monitoring.
  • the post-processing process of monitoring may also be performed.
  • a schematic diagram of a post-processing flow of a random access method includes the following steps:
  • the above S802 to S806 may be performed by the second device.
  • the second device may be a terminal.
  • the second device may define a new variable, such as a retransmission count counter, which is used to count the number of blind retransmissions of MSG3 (or the number of blind scheduling and response reception of MSG3), and its initial value may be 0 or 1.
  • the second device can obtain the current variable value, for example, obtain the counting result of the retransmission counter in real time, and determine whether the counting result of the retransmission counter is less than the blind retransmission threshold (or the blind retransmission threshold plus 1).
  • the blind retransmission threshold can be at least one indication of the fifth sub-information, the sixth sub-information or the seventh sub-information in the first information. If so, the above variable can be updated, that is, the counting result of the retransmission counter is updated. For example, the second device can add 1 to the retransmission counter, thereby updating the counting result of the retransmission counter.
  • the second device can stop monitoring the first response, for example, the second device can stop the timer, thereby stopping monitoring the first response.
  • the second device can determine that the first response is received successfully when the counting result of the retransmission counter is equal to the blind retransmission threshold.
  • the second device may determine that the first response is successfully received when the counting result of the retransmission counter is equal to the blind retransmission threshold plus 1.
  • different retransmission counts may be set for different random accesses. For example, for four-step random access, a first retransmission count counter is set, and for two-step random access, a second retransmission count counter is set.
  • the count result of the first retransmission counter is less than the blind retransmission threshold (or the blind retransmission threshold plus 1)
  • the count result of the first retransmission counter is updated, and when the count result of the first retransmission counter is greater than or equal to the blind retransmission threshold (or the blind retransmission threshold plus 1), for example, the count result of the first retransmission counter is equal to the blind retransmission threshold, or the count result of the first retransmission counter is equal to the blind retransmission threshold plus 1, it is determined that the first response (such as the first RAR) is received successfully.
  • the second device can stop monitoring the first response, for example, the first timer can be stopped, thereby stopping monitoring the first response.
  • the count result of the second retransmission counter is updated.
  • the count result of the second retransmission counter is greater than or equal to the blind retransmission threshold (or the blind retransmission threshold plus 1), for example, the count result of the second retransmission counter is equal to the blind retransmission threshold, or the count result of the second retransmission counter is equal to the blind retransmission threshold plus 1, it is determined that the first response (such as the first fallback RAR) is received successfully.
  • the second device can stop listening to the first response, for example, the second timer can be stopped, thereby stopping listening to the first response.
  • the second device may learn through other means that the counting result of the retransmission counter is less than the blind retransmission threshold (or the blind retransmission threshold plus 1), or learn that the counting result of the retransmission counter is greater than or equal to the blind retransmission threshold (or the blind retransmission threshold plus 1).
  • the counting result of the retransmission counter is updated; when the counting result of the retransmission counter is greater than or equal to the blind retransmission threshold (or the blind retransmission threshold plus 1), it is determined that the first response is received successfully.
  • the second device may update the counting result of the retransmission counter when it monitors the first response.
  • the embodiment shown in FIG8 describes the counting logic of the retransmission counter.
  • the embodiment shown in FIG8 can be implemented alone to count the number of retransmissions during the blind retransmission of MSG3, or can be combined with other embodiments.
  • the embodiment shown in FIG8 can be combined with the embodiment shown in FIG5, or with the embodiments shown in FIG5 and FIG6, or with the embodiments shown in FIG5, FIG6, and FIG7.
  • the embodiment shown in FIG8 can also be combined with subsequent embodiments.
  • FIG. 9 another schematic diagram of a post-processing process of a random access method includes the following steps:
  • the above S902 to S910 may be performed by the second device.
  • the second device may be a terminal. Specifically, when the timer exceeds In the case of a four-step random access, the second device may determine whether N responses (responses corresponding to the sent preamble or preamble identifier RAPID) have been received, where N may be equal to the blind retransmission threshold indicated by the fifth sub-information, the sixth sub-information, or the seventh sub-information. Wherein, for four-step random access, the second device may determine whether N 1 RARs have been received when the first timer times out, where N 1 may be equal to the blind retransmission threshold indicated by the fifth sub-information or the sixth sub-information, that is, N 1 is equal to the first threshold.
  • the second device may determine whether N 2 fallback RARs have been received when the second timer times out, where N 2 may be equal to the blind retransmission threshold indicated by the fifth sub-information or the seventh sub-information, that is, N 2 is equal to the second threshold.
  • the second device may determine whether N responses have been received by reading the counting result of the retransmission counter, for example, by reading the counting result of the first retransmission counter, or by reading the counting result of the second retransmission counter.
  • the second device may also count the number of responses received corresponding to the preamble used in random access to determine whether N responses have been received.
  • the above-mentioned judgment step such as S902 may not be performed.
  • the second device may learn in other ways that the counting result of the retransmission counter is less than the blind retransmission threshold (or the blind retransmission threshold plus 1), or learn that the counting result of the retransmission counter is greater than or equal to the blind retransmission threshold (or the blind retransmission threshold plus 1).
  • the second device may update the counting result of the random access preamble transmission counter (also referred to as the preamble transmission counter), for example, the preamble transmission counter may be increased by 1. If the counting result of the current preamble transmission counter is greater than the maximum number of preamble transmissions, for example, the counting result of the preamble transmission counter is the maximum number of preamble transmissions plus 1, it means that the random access is not successfully completed, and the random access process can be terminated.
  • the second device may make another random access attempt, for example, reselect random access resources to continue sending the preamble.
  • the second device may also stop monitoring the first response when the timer times out. For example, the second device may stop the timer when the timer times out, thereby stopping monitoring the first response.
  • the second device can stop the first timer when the first timer times out, thereby stopping monitoring the RAR. If the first timer times out and no RAR is received N times (the value of the first threshold), it is considered that the RAR reception is not successful, and the second device can add 1 to the preamble transmission counter. If the count result of the current preamble transmission counter is greater than the maximum number of preamble transmissions, for example, the maximum number of transmissions plus 1, it means that the random access has not been successfully completed and the random access process can be terminated. If the count result of the current preamble transmission counter is less than or equal to the maximum number of preamble transmissions, it means that the random access has not ended, and the second device can return to the random access resource selection and continue to send the preamble.
  • the second device may stop the second timer when the second timer times out, thereby stopping monitoring the fallback RAR. If the second timer times out and no fallback RAR is received N times (the value of the second threshold), it is considered that the fallback RAR reception was not successful, and the second device may add 1 to the preamble transmission counter. If the count result of the current lead code transmission counter is greater than the maximum number of preamble transmissions, for example, the maximum number of transmissions plus 1, it indicates that the random access was not successfully completed and the random access process may be terminated. If the count result of the current lead code transmission counter is less than or equal to the maximum number of preamble transmissions, it indicates that the random access has not ended, and the second device may return to the random access resource selection and continue to send the preamble.
  • the embodiment shown in FIG. 9 describes the processing logic when the timer times out.
  • the embodiment shown in FIG. 9 can be implemented independently. It can also be combined with other embodiments.
  • the embodiment shown in FIG9 can be combined with the embodiment shown in FIG6, or with the embodiments shown in FIG5, FIG6, and FIG7, or with the embodiments shown in FIG5, FIG6, FIG7, and FIG8.
  • the embodiment shown in FIG9 can also be combined with subsequent embodiments.
  • the above embodiment introduces the random access method from the terminal side.
  • the following will explain the random access method from the network side.
  • the method includes:
  • the above S1002 and S1004 can be performed by the first device.
  • the first device can be a network device, including but not limited to a base station.
  • the target power is a threshold value of the reference signal received power RSRP, which can be configured by the first device.
  • RSRP can be the RSRP of the second device itself, or it can be the average value of the RSRP of each device in the cell where the second device is located.
  • the second device can be a terminal.
  • the second device can report to the first device after measuring its own RSRP. In this way, the first device can obtain the RSRP of the second device.
  • the first device can also obtain the RSRP reported by other devices in the cell where the second device is located, and the first device can determine the average value of the RSRP of each device in the cell.
  • the first device can compare the RSRP reported by the second device with the target power, or compare the average value of RSRP with the target power.
  • RSRP the RSRP of the second device or the average value of RSRP of each device in the cell where the second device is located
  • RSRP the RSRP of the second device or the average value of RSRP of each device in the cell where the second device is located
  • the first information may also be reported by the second device.
  • the first device may receive MSG1 sent by the second device, determine the RSRP measured by the second device according to the received power, and obtain the first information based on the RSRP, thereby indicating the first information.
  • the first information may include at least one of the following sub-information: first sub-information, second sub-information, third sub-information, fourth sub-information, fifth sub-information, sixth sub-information and seventh sub-information.
  • the relevant content description of the sub-information can refer to the relevant content description above, which will not be repeated here.
  • the first device may indicate the first information through a system message, through an information element IE, or through a MAC CE.
  • the IE is used to configure four-step random access process parameters or two-step random access process parameters, and the MAC CE includes RAR and/or fallback RAR.
  • the following example uses the corresponding sub-information carried in RAR or fallback RAR to indicate the first information.
  • the initial RAR (also called the second RAR) may include at least one of the first sub-information, the second sub-information, the third sub-information, and the fourth sub-information, and/or at least one of the fifth sub-information, the sixth sub-information, and the seventh sub-information.
  • the initial RAR may include the first sub-information, and the first sub-information may be represented by the character P, occupying 1 bit.
  • the initial RAR may include the fifth sub-information, and the fifth sub-information may be represented by the character N, occupying 8 bits.
  • the initial RAR may also include spare bits, denoted as R.
  • the initial RAR may include the first sub-information and the fifth sub-information.
  • the initial RAR in FIG11C includes the bit "P" representing the first sub-information. But does not include the above-mentioned spare bit "R".
  • the subsequent RAR (also referred to as the first RAR) may include at least one of the first sub-information, the second sub-information, the third sub-information, and the fourth sub-information, at least one of the fifth sub-information, the sixth sub-information, and the seventh sub-information, and/or at least one of the spare bits.
  • the format of the subsequent RAR may be the same as the format of the initial RAR, so that the RAR complexity can be reduced.
  • the format of the subsequent RAR may be different from the format of the initial RAR, so that the initial RAR and the subsequent RAR can be identified by the format.
  • the subsequent RAR when the initial RAR is in the format shown in FIG. 11A, the subsequent RAR may be in the format shown in FIG. 12A. Compared with the initial RAR of FIG. 11A, the subsequent RAR of FIG. 12A includes a spare bit "R" and does not include a bit "P" representing the first sub-information. In other examples, when the initial RAR is in the format shown in FIG. 11B or FIG. 11C, the subsequent RAR may be in the format of FIG. 12B or FIG. 12C. Compared with the initial RAR of FIG. 11B, the subsequent RAR of FIG.
  • 11B includes a bit "P" representing the first sub-information, does not include a spare bit “R", and "N” representing the fifth sub-information, and the subsequent RAR of FIG. 12B does not include "N” representing the fifth sub-information.
  • the subsequent RAR of FIG. 12B does not include "N” representing the fifth sub-information
  • the subsequent RAR of FIG. 12C does not include a bit "P” representing the first sub-information and "N" representing the fifth sub-information, and includes a spare bit "R”.
  • the above S1002 is an optional step of the embodiment of the present application, and the random access method of the embodiment of the present application may not perform the above S1002.
  • the first device may configure the first information to indicate the first information.
  • FIG10 can be implemented alone or in combination with other embodiments, for example, in combination with a terminal side embodiment, and this application does not limit this.
  • the method includes the following steps:
  • the terminal selects random access resources.
  • Random access resources refer to resources used for random access, including but not limited to preamble resources and random access occasion (RO) resources.
  • RO resources refer to time-frequency resources (time domain resources, frequency domain resources, also called time domain RO, frequency domain RO) that can transmit preambles.
  • the terminal can select a target resource from the random access resource pool according to the random access resource pool configured by the network side for random access, wherein the target resource can be an idle resource in the random access resource pool, such as an idle preamble code in the code resource pool, or an idle RO resource in the RO resource pool.
  • the target resource can be an idle resource in the random access resource pool, such as an idle preamble code in the code resource pool, or an idle RO resource in the RO resource pool.
  • S1304 The terminal selects four-step random access and sends MSG1.
  • the terminal can select four-step random access when RSRP is less than the target power.
  • the terminal has just accessed the cell, RSRP is greater than the target power, indicating good performance, and the terminal can choose to use two-step random access.
  • the performance decreases, and the terminal can choose to fall back from two-step random access to four-step random access.
  • the terminal has just accessed the cell, RSRP is less than or equal to the target power, indicating poor performance, and the terminal can choose to use four-step random access.
  • MSG1 may carry a preamble identifier RAPID to indicate the preamble used in this random access. In some examples, MSG1 may also carry the preamble used in this random access.
  • the terminal may send the above-mentioned preamble identifier RAPID to the base station. RAPID or MSG1 of preamble.
  • the base station indicates first information.
  • the base station may obtain the RSRP reported by the terminal.
  • the terminal may carry the RSRP measured by the terminal in MSG1.
  • the base station may indicate the first information.
  • the base station may indicate the first information through at least one of a system message, an IE, or a MAC CE.
  • the base station may indicate the first information through a MAC CE (for example, a RAR).
  • S1306 The terminal opens a RAR window to monitor the RAR.
  • S1308 is executed.
  • MSG1 may carry a preamble identifier RAPID to indicate the preamble used in this random access.
  • the initial RAR may be the first RAR corresponding to the RAPID in MSG1 monitored during this random access.
  • the initial RAR may also be the first RAR corresponding to the preamble in MSG1 monitored during this random access.
  • the terminal determines whether the initial RAR is a MAC data packet including only RAPID. If not, execute S1310. If yes, execute S1328.
  • the terminal can parse the initial RAR to determine whether the initial RAR is a MAC data packet that only includes RAPID.
  • the initial RAR is a MAC data packet that only includes RAPID, indicating that the random access is completed, and S1328 can be executed to end the random access process.
  • the initial RAR is not a MAC data packet that only includes RAPID.
  • the initial RAR also includes TA and PUSCH scheduling information UL_Grant allocated for the transmission of MSG3 (including whether frequency hopping, modulation coding rate, access resources and access time, etc.), which means that the random access is not completed and S1310 can be executed.
  • the terminal determines whether the random access is contention-based random access. If so, execute S1312; if not, execute S1328.
  • the terminal may determine whether the random access is a contention-based random access by determining whether the preamble used for the random access is a contention-based preamble, for example, whether the preamble is in a contention-based code resource pool.
  • the above S1308 and S1310 are executed in sequence according to the set order. In other possible implementations of the embodiment of the present application, they can also be executed in other orders or in parallel, which is not limited in this embodiment. In some possible implementations, the terminal may not execute the above S1308 or S1310, for example, it can determine whether the random access is completed in a subsequent process.
  • S1312 The terminal determines whether the first information is obtained. If so, execute S1314.
  • the terminal may obtain the first information from the initial RAR, obtain the first information from the system message, or obtain the first information from the IE.
  • the terminal obtains the first information, it may be known that blind retransmission of MSG3 in random access is required.
  • the first information includes at least one of the first sub-information, the second sub-information, the third sub-information, and the fourth sub-information, or includes at least one of the fifth sub-information, the sixth sub-information, and the seventh sub-information, that is, indicating that blind retransmission of MSG3 is to be performed, then the terminal may be aware of the need to perform blind retransmission of MSG3 when obtaining the first information, and therefore, the terminal may execute S1314 to perform blind retransmission of MSG3.
  • the first sub-information, the second sub-information, the third sub-information and the fourth sub-information indicate whether to blindly retransmit MSG3 through different values. Then, when the terminal obtains the first information, the first information includes at least one of the first sub-information, the second sub-information, the third sub-information and the fourth sub-information, and at least one of the first sub-information, the second sub-information, the third sub-information and the fourth sub-information indicates yes, the terminal can know that blind retransmission of MSG3 is needed. Therefore, the terminal can execute S1314 to perform blind retransmission of MSG3.
  • S1314 The terminal starts a first timer and monitors a subsequent RAR during the operation of the first timer. When a subsequent RAR is monitored, S1316 is executed.
  • the subsequent RAR may be the RAR other than the initial RAR in the RAR corresponding to the RAPID in MSG1 in this random access process, for example, the second RAR, the third RAR, ... the Nth RAR corresponding to RAPID.
  • the subsequent RAR may also be the RAR other than the initial RAR in the RAR corresponding to the preamble in MSG1 in this random access process.
  • a first timer such as the new timer in FIG. 13B , may be started to monitor subsequent RARs.
  • the above S1314 is a specific implementation of the terminal monitoring the subsequent RAR.
  • the subsequent RAR can also be monitored in other ways.
  • the terminal can also open a new window to monitor the subsequent RAR.
  • S1316 The terminal determines whether the count result of the first retransmission counter is greater than or equal to the first threshold. If yes, execute S1317. If no, execute S1318.
  • S1316 is an optional step of the embodiment of the present application, and the random access method of the embodiment of the present application may not execute S1316. For example, if the first information does not include the fifth sub-information and the sixth sub-information, or does not indicate the blind retransmission threshold of the four-step random access, S1316 may not be executed.
  • S1317 The terminal determines that the RAR is received successfully.
  • S1320 when the RAR is received successfully, S1320 may also be executed.
  • the terminal updates the counting result of the first retransmission count counter.
  • the terminal may increase the first retransmission counter by 1 each time it receives a subsequent RAR (non-initial RAR) when it is determined that the count result of the first retransmission counter is less than the first threshold.
  • the initial value of the first retransmission counter is 0.
  • the first retransmission counter may be increased by 1 when it is determined that the first retransmission counter is less than the updated first threshold (for example, the first threshold plus 1).
  • S1319 The terminal determines whether the first timer has timed out, and if so, executes S1320 and S1322.
  • the terminal may not execute S1322 and S1324.
  • S1320 The terminal stops monitoring subsequent RARs.
  • the terminal may stop the first timer, thereby stopping monitoring subsequent RARs. As shown in FIG13B , when the new timer times out, the terminal may stop the new timer, thereby stopping monitoring subsequent RARs.
  • S1322 The terminal determines whether the count result of the first retransmission counter is less than the first threshold, or determines whether the number of received RARs corresponding to the RAPID in the sent MSG1 is less than the first threshold. If yes, execute S1324; if no, execute S1328.
  • the terminal increases the preamble code transmission counter by 1.
  • S1326 The terminal determines whether the count result of the preamble transmission counter is greater than the maximum number of preamble transmission times. If not, the terminal returns to S1302; if yes, the terminal executes S1328.
  • the count result of the current preamble transmission counter is greater than the maximum number of preamble transmissions, for example, equal to the maximum number of transmissions plus 1, it means that the random access process is not successfully completed, and S1328 can be executed to end the random access process. If the count result of the preamble transmission counter is less than or equal to the maximum number of preamble transmission times, it means that the random access process is not completed, and the process can return to S1302 to continue sending the preamble.
  • the terminal ends the random access process.
  • the method includes the following steps:
  • the terminal selects random access resources.
  • Random access resources refer to resources used for random access, including but not limited to preamble resources, random access opportunity RO resources, and PUSCH resources.
  • the terminal can select target resources from the random access resource pool according to the random access resource pool configured on the network side for random access.
  • the target resource can be an idle resource in the random access resource pool, such as an idle preamble in the code resource pool, or an idle RO resource in the RO resource pool, or an idle PUSCH in the PUSCH resource pool.
  • S1404 The terminal selects two-step random access and sends MSGA.
  • the terminal obtains RSRP.
  • RSRP is greater than the target power, it indicates good performance.
  • the terminal may choose to use two-step random access to reduce the number of interactions and thus reduce power consumption.
  • the MSGA may carry a preamble identifier RAPID to indicate the preamble used for this random access. In some examples, the MSGA may also carry the preamble used for this random access. In addition, the MSGA also includes a PUSCH payload. The terminal may then send the MSGA carrying the preamble (or RAPID) and the PUSCH payload to the base station.
  • the base station indicates first information.
  • the base station may obtain the RSRP reported by the terminal.
  • the terminal may carry the RSRP measured by the terminal in MSG1.
  • the base station may indicate the first information.
  • the base station may indicate the first information through at least one of a system message, an IE, or a MAC CE.
  • the base station may indicate the first information through a MAC CE (e.g., a fallback RAR).
  • the terminal opens a MSGB response window to monitor the RAR encrypted with MSGB-RNTI.
  • S1408 is executed.
  • the random access response window is also called the MSGB response window, which is used to monitor the RAR encrypted with the MSGB-RNTI.
  • the RAR encrypted with the MSGB-RNTI may include a fallback RAR.
  • the initial RAR may be the first fallback RAR corresponding to the sent preamble or RAPID, also called the initial fallback RAR.
  • the terminal monitors the fallback RAR it can identify whether the fallback RAR is the first fallback RAR corresponding to the sent preamble or RAPID. If so, it means that the initial RAR is monitored.
  • the terminal determines whether the random access is contention-based random access. If so, execute S1410; if not, execute S1426.
  • the terminal may determine whether the random access is a contention-based random access by determining whether the preamble used for the random access is a contention-based preamble, for example, whether the preamble is in a contention-based code resource pool.
  • the above S1408 is an optional step in the embodiment of the present application, and the random access method in the embodiment of the present application may not execute the above step.
  • S1410 The terminal determines whether the first information is obtained. If so, execute S1412.
  • the terminal may obtain the first information from MAC CE (such as initial fallback RAR), obtain the first information from a system message, or obtain the first information from an IE.
  • the terminal obtains the first information, it may be known that blind retransmission of MSG3 in random access is required.
  • the first information includes at least one of the first sub-information, the second sub-information, the third sub-information, and the fourth sub-information, or includes at least one of the fifth sub-information, the sixth sub-information, and the seventh sub-information, indicating that blind retransmission of MSG3 is to be performed. Then, when the terminal obtains the first information, it may be known that blind retransmission of MSG3 is required.
  • the terminal may execute S1412 to perform blind retransmission of MSG3.
  • the first sub-information, the second sub-information, the third sub-information and the fourth sub-information indicate whether to blindly retransmit MSG3 through different values. Then, when the terminal obtains the first information, the first information includes at least one of the first sub-information, the second sub-information, the third sub-information and the fourth sub-information, and at least one of the first sub-information, the second sub-information, the third sub-information and the fourth sub-information indicates yes, the terminal can know that blind retransmission of MSG3 is needed. Therefore, the terminal can execute S1412 to perform blind retransmission of MSG3.
  • S1412 The terminal starts a second timer and monitors a subsequent RAR during the operation of the second timer. When a subsequent RAR is monitored, S1414 is executed.
  • the subsequent RAR may be the fallback RAR other than the initial fallback RAR in the RAR corresponding to the RAPID carried by MSG1 in this random access process, for example, the second fallback RAR, the third fallback RAR, and so on, the Nth fallback RAR corresponding to RAPID.
  • the subsequent RAR may also be the fallback RAR other than the initial fallback RAR in the fallback RAR corresponding to the preamble carried by MSG1 in this random access process.
  • the above S1412 is a specific implementation of the terminal monitoring the subsequent RAR.
  • the subsequent RAR can also be monitored in other ways.
  • the terminal can also open a new window to monitor the subsequent RAR.
  • S1414 The terminal determines whether the count result of the second retransmission count counter is greater than or equal to the second threshold value. If yes, execute S1415; if no, execute S1416.
  • S1414 is an optional step of the embodiment of the present application, and the random access method of the embodiment of the present application may not execute S1414. For example, if the first information does not include the fifth sub-information and the seventh sub-information, or does not indicate the blind retransmission threshold of the two-step random access, S1414 may not be executed.
  • the terminal determines that the fallback RAR is received successfully.
  • the terminal when the fallback RAR is received successfully, the terminal can also execute S1418.
  • the terminal updates the counting result of the second retransmission count counter.
  • the terminal may increase the second retransmission counter by 1 each time it receives a subsequent RAR (for example, a subsequent fallback RAR) when it is determined that the count result of the second retransmission counter is less than the second threshold.
  • a subsequent RAR for example, a subsequent fallback RAR
  • the initial value of the second retransmission counter is 0.
  • the second retransmission count counter may be incremented by 1.
  • S1417 The terminal determines whether the second timer has timed out, and if so, executes S1418 and S1420.
  • the terminal may not execute S1420 and S1422.
  • the terminal may stop the second timer to stop listening to subsequent fallback RARs. Still using the example of FIG. 14B , when the terminal receives the last fallback RAR in a new timer, the terminal may stop the new timer to stop listening to subsequent fallback RARs.
  • S1420 The terminal determines whether the count result of the second retransmission counter is less than the second threshold value, or determines whether the number of fallback RARs received corresponding to the RAPID in the sent MSGA is less than the second threshold value. If yes, execute S1422; if no, execute S1426.
  • the terminal increases the preamble code transmission counter by 1.
  • S1424 The terminal determines whether the count result of the preamble transmission counter is greater than the maximum number of preamble transmission times. If not, the process returns to S1402. If yes, the process proceeds to S1426.
  • the count result of the current guide code transmission counter is greater than the maximum number of transmission times of the preamble code, for example, equal to the maximum number of transmission times plus 1, it means that the random access process is not successfully completed, and S1426 can be executed to end the random access process. If the count result of the current guide code transmission counter is less than or equal to the maximum number of transmission times of the preamble code, it means that the random access process is not completed, and it can return to S1402 to continue sending the preamble code.
  • FIG15 is an example of the composition of an electronic device provided in an embodiment of the present application.
  • the electronic device may be a first device, including but not limited to a base station and a core network unit.
  • FIG15 shows a simplified schematic diagram of the base station structure.
  • the base station includes parts 1510, 1520, and 1530.
  • Part 1510 is mainly used for baseband processing, controlling the base station, etc.;
  • Part 1510 is usually the control center of the base station, which can usually be called a processor, and is used to control the base station to perform the processing operations on the first device side in the above method embodiment.
  • Part 1520 is mainly used to store computer program code and data.
  • Part 1530 is mainly used for receiving and transmitting radio frequency signals and converting radio frequency signals to baseband signals; Part 1530 can usually be called a transceiver module, a transceiver, a transceiver circuit, or a transceiver.
  • the transceiver module of part 1530 which can also be called a transceiver or a transceiver, includes an antenna 1533 and a radio frequency circuit (not shown in the figure), wherein the radio frequency circuit is mainly used for radio frequency processing.
  • the device for implementing the receiving function in part 1530 may be regarded as a receiver, and the device for implementing the transmitting function may be regarded as a transmitter, that is, part 1530 includes a receiver 1532 and a transmitter 1531.
  • the receiver may also be referred to as a receiving module, a receiver, or a receiving circuit, etc.
  • the transmitter may be referred to as a transmitting module, a transmitter, or a transmitting circuit, etc.
  • Part 1510 and part 1520 may include one or more boards, each of which may include one or more processors and one or more memories.
  • the processor is used to read and execute programs in the memory to implement baseband processing functions and control the base station. If there are multiple boards, the boards can be interconnected to enhance processing capabilities.
  • the implementation method may also be that multiple boards share one or more processors, or multiple boards share one or more memories, or multiple boards share one or more processors at the same time.
  • the transceiver module of part 1530 is used to execute the transceiver-related process executed by the base station (first device) in the aforementioned method embodiment.
  • the processor of part 1510 is used to execute the processing-related process executed by the base station in the aforementioned method embodiment.
  • FIG. 15 is merely an example and not a limitation, and the network device including the processor, memory, and transceiver may not rely on the structure shown in FIG. 15 .
  • FIG16 is an example of the composition of another electronic device provided in an embodiment of the present application.
  • the electronic device may be a second device, and the second device may be a terminal, including but not limited to mobile phones, smart wearable devices (such as smart watches) and other electronic devices.
  • the electronic device may include a processor 310, an external memory interface 320, an internal memory 321, a display screen 330, a camera 340, an antenna 1, an antenna 2, a mobile communication module 350, and a wireless communication module 360, etc.
  • the structure illustrated in this embodiment does not constitute a specific limitation on the electronic device.
  • the electronic device may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently.
  • the components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.
  • the processor 310 may include one or more processing units, for example, the processor 310 may include an application processor (AP), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and/or a neural-network processing unit (NPU), etc.
  • AP application processor
  • GPU graphics processor
  • ISP image signal processor
  • DSP digital signal processor
  • NPU neural-network processing unit
  • Different processing units may be independent devices or integrated into one or more processors.
  • the interface connection relationship between the modules illustrated in this embodiment is only a schematic illustration and does not constitute a structural limitation of the electronic device.
  • the electronic device may also adopt different interface connection methods in the above embodiments, or a combination of multiple interface connection methods.
  • the external memory interface 320 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the electronic device.
  • the external memory card communicates with the processor 310 through the external memory interface 320 to implement a data storage function. For example, files such as music and videos can be saved in the external memory card.
  • the internal memory 321 can be used to store computer executable program codes, and the executable program codes include instructions.
  • the processor 310 executes various functional applications and data processing of the electronic device by running the instructions stored in the internal memory 321.
  • the internal memory 321 may include a program storage area and a data storage area.
  • the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.
  • the data storage area may store data created during the use of the electronic device (such as audio data, a phone book, etc.), etc.
  • the internal memory 321 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash storage (UFS), etc.
  • the processor 310 executes various functional applications and data processing of the electronic device by running the instructions stored in the internal memory 321, and/or the instructions stored in the memory provided in the processor.
  • the wireless communication function of the electronic device can be implemented through antenna 1, antenna 2, mobile communication module 350, wireless communication module 360, modem processor and baseband processor.
  • Antenna 1 and antenna 2 are used to transmit and receive electromagnetic wave signals.
  • Each antenna in the electronic device can be used to cover a single or multiple communication frequency bands. Different antennas can also be reused to improve the utilization of the antennas.
  • antenna 1 can be reused as a diversity antenna for a wireless local area network.
  • the antenna can be used in combination with a tuning switch.
  • the mobile communication module 350 can provide solutions for wireless communications including 2G/3G/4G/5G, etc., applied to electronic devices.
  • the mobile communication module 350 may include at least one filter, a switch, a power amplifier, a low noise amplifier (LNA), etc.
  • the mobile communication module 350 may receive electromagnetic waves from the antenna 1, and perform filtering, amplification, and other processing on the received electromagnetic waves, and transmit them to the modulation and demodulation processor for demodulation.
  • the mobile communication module 350 may also amplify the signal modulated by the modulation and demodulation processor, and convert it into electromagnetic waves for radiation through the antenna 1.
  • at least some of the functional modules of the mobile communication module 350 may be arranged in the processor 310.
  • at least some of the functional modules of the mobile communication module 350 may be arranged in the same device as at least some of the modules of the processor 310.
  • the electronic device initiates or receives a call request through the mobile communication module 350 and the antenna 1 .
  • an operating system is running on the above components.
  • an iOS operating system for example, an Android operating system, a Windows operating system, etc.
  • Applications can be installed and run on the operating system.
  • the present application also provides a communication system, which may include a first device as shown in FIG. 15 (eg, a network device such as a base station) and a second device as shown in FIG. 16 (eg, a terminal such as a mobile phone).
  • a first device as shown in FIG. 15
  • a second device as shown in FIG. 16
  • a terminal such as a mobile phone
  • a terminal or network device may include a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer.
  • the hardware layer may include hardware such as a central processing unit (CPU), a memory management unit (MMU), and a memory (also called main memory).
  • the operating system of the operating system layer may be any one or more computer operating systems that implement business processing through processes, such as Linux operating system, Unix operating system, Android operating system, iOS operating system, or Windows operating system.
  • the application layer may include applications such as browsers, address books, word processing software, and instant messaging software.
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed.
  • Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.
  • modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional module in each embodiment of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or software functional modules.
  • the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium.
  • the part that essentially contributes to the technical solution of the present application or all or 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 a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the process of the method described in each embodiment of the present application.
  • the aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk.

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Abstract

本申请提供一种随机接入方法及相关设备，包括：指示第一信息，第一信息对应于随机接入中第三消息的盲重传信息，第一信息包括以下至少一项子信息：第一子信息，用于指示是否进行随机接入中第三消息的盲重传，第二子信息，用于指示是否进行四步随机接入中第三消息的盲重传，第三子信息，用于指示是否进行两步随机接入中第三消息的盲重传，第四子信息，用于指示是否进行四步随机接入中第三消息的盲重传以及是否进行两步随机接入中第三消息的盲重传，第五子信息，用于指示随机接入的盲重传阈值，第六子信息，用于指示四步随机接入的盲重传阈值，第七子信息，用于指示两步随机接入的盲重传阈值。即使在网络信道较差时，也能够监听到网络侧的盲调度。

Description

一种随机接入方法及相关设备
本申请要求于2023年05月11日提交中国国家知识产权局、申请号为202310538524.5、发明名称为“一种随机接入方法及相关设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种随机接入方法及相关设备。
背景技术
随着移动通信技术的发展，尤其是第五代移动通信技术(the fifth generation mobile networks，简称为5G)等新一代移动通信技术的不断发展，通信系统的功能正在不断增强。具体地，5G通信系统可以提供增强型移动带宽(enhanced Mobile Broadband，eMBB)，具有更快的连接、更高的吞吐量和更大的容量，以及提供超高可靠低延迟通信(ultra-reliable low-latency communications，uRLLC)，从而将网络应用在需要不间断和稳定数据链接的关键任务场景，满足场景对于无线通信网络的超高可靠性和低延迟的要求，而且能够提供大规模机器类互联(massive Machine Type Communications，mMTC)，例如应用于物联网(Internet of Things，IoT)场景中，将大量物联网设备互联。
通信系统可以包括基站等网络设备。每个基站可以支持多个终端的通信，其中，终端可以是用户设备(user equipment，UE)。UE等终端可以通过随机接入(random access，RA)实现与基站通信。具体地，UE可以发送随机接入前导码(简称为前导码，preamble)，例如是通过第一消息(Message1，记作MSG1)或者是MessageA(记作MSGA)发送preamble，并在发送preamble之后开启随机接入响应窗口(random access response window，RAR window)监听RAR(包括四步随机接入过程的RAR或者两步随机接入过程的fallback RAR)，当成功监听到RAR，例如是监听到第二消息(Message2，记作MSG2)中的RAR或者是MessageB(记作MSGB)中的fallback RAR，可以发送第三消息，以进行竞争解决。
在非地面网络(Non-terrestrial Network，NTN)场景下，由于NTN场景下时延较大，数据传输的往返时间是地面网络(terrestrial network，TN)场景下的几十甚至几百倍，在UE传输数据之后，往往要经过十几甚至几百毫秒(millisecond，ms)的时长才可以接收到网络侧调度，因此在以上随机接入过程中，UE发送完MSG1之后不会立即开启RAR窗口，而是经过一个往返时间之后在开启RAR窗口，同时在发送完MSG3之后，会经过一个往返时间之后开启竞争解决窗口。
当网络侧指示进行MSG3的盲调度的情况下(即网络侧在没有接收到MSG3情况下连续发送RAR，指示终端进行MSG3的盲重传)，上述方案可以导致UE侧无法监听到网络侧MSG3的盲调度。
发明内容
本申请提供了一种随机接入方法及相关设备，目的在于解决网络信道较差情况下，网络侧指示进行MSG3的盲调度，终端难以监听到网络侧的盲调度的问题。
为了实现上述目的，本申请提供了以下技术方案：
本申请的第一方面提供一种随机接入方法。该方法可以由第一设备执行。第一设备可以是网络侧用于提供网络通信功能的设备，有些情况下也称作网络设备、网元，网络设备通常可以是基站，基站的功能单元，或者是基站的功能单元的组合。
具体实现时，指示第一信息，该第一信息对应于随机接入中第三消息(message3，MSG3)的盲重传信息。MSG3可以携带无线资源控制(radio resource control，RRC)建链请求(RRC Connection Request)或者RRC重建请求(RRC Connection Re-establishment Request)，因此，第三消息也称作调度传输(scheduled transmission)消息。MSG3的盲重传，也称作MSG3的盲调度，具体是指在没有接收到MSG3的情况下连续地发送随机接入响应(random access response，RAR)。
第一信息包括以下至少一项子信息：第一子信息、第二子信息、第三子信息、第四子信息、第五子信息、第六子信息或第七子信息。其中，第一子信息用于指示是否进行随机接入中MSG3的盲重传；第二子信息用于指示是否进行四步随机接入中MSG3的盲重传；第三子信息用于指示是否进行两步随机接入中MSG3的盲重传；第四子信息用于指示是否进行四步随机接入中的MSG3的盲重传以及是否进行两步随机接入中MSG3的盲重传；第五子信息用于指示随机接入中MSG3的盲重传阈值；第六子信息用于指示四步随机接入中MSG3的盲重传阈值；第七子信息用于指示两步随机接入中MSG3的盲重传阈值。
上述子信息能够直接或间接指示是否进行MSG3的盲重传。如此，即使在网络信道较差的情况(例如是非地面网络场景)下，UE等终端也可以监听到网络侧的MSG3盲重传指示，进而基于该指示进行MSG3的盲重传，提高随机接入成功率，缩短随机接入时间，减少随机接入资源占用，进而降低终端的功耗。
在一些可能的实现方式中，可以通过系统消息指示第一信息；或者，通过信息元素(information element，IE)指示第一信息，其中，IE用于配置四步随机接入过程参数或两步随机接入过程参数；或者，通过介质访问控制层控制元素(medium access control control element，MAC CE)指示第一信息。该方法提供了多种方式来指示第一信息，能够满足不同业务或场景的需求，具有较高可用性。
本申请的第二方面提供一种随机接入方法。该方法可以由第二设备执行。其中，第二设备可以为终端。具体实现时，可以获取第一信息，该第一信息对应于随机接入中MSG3的盲重传信息，第一信息包括以下至少一项子信息：第一子信息、第二子信息、第三子信息、第四子信息、第五子信息、第六子信息或第七子信息。其中，第一子信息用于指示是否进行随机接入中MSG3的盲重传，第二子信息用于指示是否进行四步随机接入中MSG3的盲重传，第三子信息用于指示是否进行两步随机接入中MSG3的盲重传，第四子信息用于指示是否进行四步随机接入中的MSG3的盲重传以及是否进行两步随机接入中MSG3的盲重传，第五子信息用于指示随机接入中MSG3的盲重传阈值，第六子信息用于指示四步随机接入中MSG3的盲重传阈值，第七子信息用于指示两步随机接入中MSG3的盲重传阈 值。
该方法通过获取第一信息，具体是获取第一信息中直接或间接指示是否进行MSG3的重传的子信息，从而实现在网络信道较差的情况(例如是非地面网络场景)下，UE等终端也可以监听到网络侧的MSG3盲重传指示，进而基于该指示进行MSG3的盲重传，提高随机接入成功率，缩短随机接入时间，减少随机接入资源占用，进而降低终端的功耗。
在一些可能的实现方式中，可以通过如下方式获取第一信息：
获取系统消息，系统消息指示第一信息；或者，
获取信息元素IE，IE用于配置四步随机接入过程参数或两步随机接入过程参数，IE指示第一信息；或者，
获取介质访问控制层控制元素MAC CE，MAC CE指示第一信息。
该方法提供了多种方式来获取第一信息，能够满足不同业务或场景的需求，具有较高可用性。
在一些可能的实现方式中，在获知需要进行MSG3的盲重传的情况下，还可以监听第一响应。在一些示例中，当获取到第一信息，则获知需要进行MSG3的盲重传，可以监听第一响应。具体地，第一设备可以通过第一子信息、第二子信息、第三信息、第四子信息中至少一项的携带情况，和/或第五子信息、第六子信息、第七子信息中至少一项的携带情况指示是否进行MSG3的盲重传，在该情况下，当获取到第一信息，即获知需要进行MSG3的盲重传，可以监听第一响应。在另一些示例中，第一子信息、第二子信息、第三信息、第四子信息可以通过不同指示值(例如是0、1或者布尔值或者true、false)来分别指示进行MSG3的盲重传、不进行MSG3的盲重传。基于此，当第一信息包括第一子信息、第二子信息、第三子信息和第四子信息中的至少一项，且第一子信息、第二子信息、第三子信息和第四子信息中的至少一项的指示为是，则获知需要进行MSG3的盲重传，可以监听第一响应。
如此可以实现及时监听第一响应，避免非地面网络的往返时延导致终端侧未监听到盲重传指示，提高随机接入成功率，缩短随机接入时间，减少随机接入资源占用，进而降低终端的功耗。
在一些可能的实现方式中，在监听第一响应时，可以开启定时器，在该定时器运行过程中监听第一响应。该方法通过开启定时器以监听第一响应，可以不用停止随机接入响应窗口，也就无需修改随机接入响应窗口的停止条件，具有较高可用性。
在一些可能的实现方式中，随机接入可以分为四步随机接入和两步随机接入。针对四步随机接入，可以开启第一定时器，在第一定时器运行过程中监听第一响应。或者，针对两步随机接入，可以开启第二定时器，在第二定时器运行过程中监听第一响应。
该方法通过对四步随机接入、两步随机接入分别设置定时器以监听相应随机接入过程的第一响应，可以保障监听的及时性、准确性。
在一些可能的实现方式中，第一响应包括第一随机接入响应和/或第一回退随机接入响应。针对四步随机接入，第一响应可以包括第一随机接入响应。针对两步随机接入，第一响应可以包括第一回退随机接入响应。
该方法通过监听第一随机接入响应，或者第一回退随机接入响应，从而实现四步随机接入场景中MSG3的盲重传，或者是两步随机接入场景中MSG3的盲重传。
在一些可能的实现方式中，第一信息包括第五子信息、第六子信息和第七子信息中的至少一项。监听到第一响应的情况下，当重传次数计数器的计数结果小于盲重传阈值(考虑到重传次数计数器的初始值可以为1，也可以是盲重传阈值加1)，则更新重传次数计数器的计数结果。或者，监听到第一响应的情况下，当重传次数计数器的计数结果大于或等于盲重传阈值(或者是盲重传阈值加1)，则确定第一响应接收成功。其中，第一响应接收成功的情况下，还可以停止监听第一响应，例如可以通过停止定时器，从而停止监听响应。
该方法通过定义新的变量即重传次数计数器，基于该重传次数计数器对监听到第一响应次数进行统计，可以确定第一响应是否接收成功，进而对第一响应的监听进行控制。
在一些可能的实现方式中，重传次数计数器包括应用于四步随机接入的第一重传次数计数器。当第一重传次数计数器的计数结果小于盲重传阈值(或者是盲重传阈值加1)，则更新第一重传次数计数器的计数结果。或者，当第一重传次数计数器的计数结果大于或等于盲重传阈值(或者是盲重传阈值加1)，则确定第一响应接收成功。
该方法通过针对四步随机接入，定义新的变量即第一重传次数计数器，基于该第一重传次数计数器对监听到第一响应次数进行统计，可以确定第一响应是否接收成功，进而对四步随机接入的第一响应的监听进行控制。
在一些可能的实现方式中，重传次数计数器包括应用于两步随机接入的第二重传次数计数器。当第二重传次数计数器的计数结果小于盲重传阈值(或者是盲重传阈值加1)，则更新第二重传次数计数器的计数结果。或者，当第二重传次数计数器的计数结果大于或等于盲重传阈值(或者是盲重传阈值加1)，则确定第一响应接收成功。
该方法通过针对两步随机接入，定义新的变量即第二重传次数计数器，基于该第二重传次数计数器对监听到第一响应次数进行统计，可以确定第一响应是否接收成功，进而对两步随机接入的第一响应的监听进行控制。
在一些可能的实现方式中，当定时器超时，还可以停止监听第一响应。如此可以减少不必要的功耗。
在一些可能的实现方式中，当定时器超时，还可以识别响应是否接收成功，从而决策是否继续进行随机接入流程。具体地，当重传次数计数器的计数结果小于盲重传阈值(或者是盲重传阈值加1)，或接收到与随机接入使用前导码对应的响应次数小于盲重传阈值，表示响应接收不成功，可以更新前导码传输计数器的计数结果，并在前导码传输计数器的计数结果小于或等于前导码的最大发送次数时，重新选择随机接入资源。或者，当重传次数计数器的计数结果大于或等于盲重传阈值(或者是盲重传阈值加1)，表示响应接收成功，可以结束随机接入流程。
该方法提供了定时器超时情况下的处理逻辑，完善了MSG3的盲重传的机制，能够满足业务需求。
在一些可能的实现方式中，当定时器超时，可以确定重传次数计数器的计数结果是否小于盲重传阈值(或者是盲重传阈值加1)，或者确定接收到与随机接入使用前导码对应 的响应次数是否小于盲重传阈值(或者是盲重传阈值加1)。若是，则更新前导码传输计数器的计数结果，并在前导码传输计数器的计数结果小于或等于前导码的最大发送次数时，重新选择随机接入资源。或者，若否，则结束随机接入流程。如此可以实现定时器超时情况下的处理，完善MSG3的盲重传的机制。
在一些可能的实现方式中，还可以在随机接入响应窗口监听到第二响应，确定第二响应是否为仅包括前导码标识RAPID的介质访问控制MAC数据包，若否，则确定是否获取到第一信息。
其中，第二响应仅包括RAPID，表示随机接入完成，第二响应还包括其他信息，则表示随机接入未完成，可以继续执行随机接入流程。该方法通过识别随机接入是否完成，避免在随机接入已完成情况下继续执行监听等过程导致的资源浪费和功耗开销。
在一些可能的实现方式中，还可以确定随机接入是否为基于竞争的随机接入，若是，则确定是否获取到第一信息。
该方法通过确定随机接入是否为基于竞争的随机接入识别随机接入是否完成，避免在随机接入已完成情况下继续执行监听等过程导致的资源浪费和功耗开销。
在一些可能的实现方式中，第一响应包括第一子信息、第二子信息、第三子信息、第四子信息中的至少一项，和/或第五子信息、第六子信息、第七子信息中的至少一项。如此可以实现在第一响应中指示是否进行MSG3的盲重传和/或指示盲重传阈值，避免额外开销。
在一些可能的实现方式中，第二响应包括第一子信息、第二子信息、第三子信息、第四子信息中的至少一项，第五子信息、第六子信息、第七子信息中的至少一项，和/或空余比特位中的中至少一项。如此可以实现在第二响应中指示是否进行MSG3的盲重传和/或指示盲重传阈值，避免额外开销。
在一些可能的实现方式中，第一响应和第二响应的格式相同。如此可以减少响应实现的复杂度。
在一些可能的实现方式中，第一响应和第二响应的格式不同。如此可以通过识别响应格式识别第一响应或第二响应，提高响应监听效率。
本申请的第三方面提供一种随机接入方法。该方法包括：
指示第一信息，第一信息对应于随机接入中第三消息的盲重传信息；
第一信息包括以下至少一项子信息：
第一子信息，用于指示是否进行随机接入中第三消息的盲重传；
第二子信息，用于指示是否进行四步随机接入中第三消息的盲重传；
第三子信息，用于指示是否进行两步随机接入中第三消息的盲重传；
第四子信息，用于指示是否进行四步随机接入中的第三消息的盲重传以及是否进行两步随机接入中第三消息的盲重传；
第五子信息，用于指示随机接入中第三消息的盲重传阈值；
第六子信息，用于指示四步随机接入中第三消息的盲重传阈值；
第七子信息，用于指示两步随机接入中第三消息的盲重传阈值；
当第一信息包括第一子信息、第二子信息、第三子信息和第四子信息中的至少一项，且第一子信息、第二子信息、第三子信息和第四子信息中的至少一项的指示为是，监听第一响应；或者，当获取到第一信息，监听第一响应。
在一些可能的实现方式中，指示第一信息，包括：
通过系统消息指示第一信息；或者，
通过信息元素IE指示第一信息，IE用于配置四步随机接入过程参数或两步随机接入过程参数；或者，
通过介质访问控制层控制元素MAC CE指示第一信息。
在一些可能的实现方式中，监听第一响应，包括：
开启定时器，在定时器运行过程中监听第一响应。
在一些可能的实现方式中，监听第一响应，包括：
针对四步随机接入，开启第一定时器，在第一定时器运行过程中监听第一响应；或，
针对两步随机接入，开启第二定时器，在第二定时器运行过程中监听第一响应。
在一些可能的实现方式中，第一信息包括第五子信息、第六子信息和第七子信息中的至少一项，监听到第一响应，该方法还包括：
当重传次数计数器的计数结果小于盲重传阈值(或者是盲重传阈值加1)，则更新计数结果；或者，
当重传次数计数器的计数结果大于或等于盲重传阈值(或者是盲重传阈值加1)，则确定第一响应接收成功。
在一些可能的实现方式中，重传次数计数器包括应用于四步随机接入的第一重传次数计数器，该方法包括：
当第一重传次数计数器的计数结果小于盲重传阈值(或者是盲重传阈值加1)，则更新第一重传次数计数器的计数结果；或者，
当第一重传次数计数器的计数结果大于或等于盲重传阈值(或者是盲重传阈值加1)，则确定第一响应接收成功。
在一些可能的实现方式中，重传次数计数器包括应用于两步随机接入的第二重传次数计数器，该方法包括：
当第二重传次数计数器的计数结果小于盲重传阈值(或者是盲重传阈值加1)，则更新第二重传次数计数器的计数结果；或者，
当第二重传次数计数器的计数结果大于或等于盲重传阈值(或者是盲重传阈值加1)，则确定第一响应接收成功。
在一些可能的实现方式中，该方法还包括：
当定时器超时，停止监听第一响应。
在一些可能的实现方式中，当定时器超时，该方法还包括：
当重传次数计数器的计数结果小于第一阈值，或接收到与随机接入使用前导码对应的响应次数小于第一阈值，更新前导码传输计数器的计数结果，并在前导码传输计数器的计数结果小于或等于前导码的最大发送次数时，重新选择随机接入资源；或者，
当重传次数计数器的计数结果大于或等于第一阈值，结束随机接入流程。
在一些可能的实现方式中，该方法还包括：
在随机接入响应窗口监听到第二响应，确定第二响应是否为仅包括前导码标识RAPID的介质访问控制MAC数据包，若否，则确定是否获取到第一信息。
在一些可能的实现方式中，该方法还包括：
确定随机接入是否为基于竞争的随机接入，若是，则确定是否获取到第一信息。
在一些可能的实现方式中，第一响应包括第一子信息、第二子信息、第三子信息、第四子信息中的至少一项，和/或第五子信息、第六子信息、第七子信息中的至少一项。
在一些可能的实现方式中，第二响应包括第一子信息、第二子信息、第三子信息、第四子信息中的至少一项，第五子信息、第六子信息、第七子信息中的至少一项，和/或空余比特位中的中至少一项。
本申请的第四方面提供一种随机接入方法，该方法包括：
第一设备指示第一信息，第一信息对应于随机接入中第三消息的盲重传信息；
第一信息包括以下至少一项子信息：
第一子信息，用于指示是否进行随机接入中第三消息的盲重传；
第二子信息，用于指示是否进行四步随机接入中第三消息的盲重传；
第三子信息，用于指示是否进行两步随机接入中第三消息的盲重传；
第四子信息，用于指示是否进行四步随机接入中的第三消息的盲重传以及是否进行两步随机接入中第三消息的盲重传；
第五子信息，用于指示随机接入中第三消息的盲重传阈值；
第六子信息，用于指示四步随机接入中第三消息的盲重传阈值；
第七子信息，用于指示两步随机接入中第三消息的盲重传阈值；
当第一信息包括第一子信息、第二子信息、第三子信息和第四子信息中的至少一项，且第一子信息、第二子信息、第三子信息和第四子信息中的至少一项的指示为是，第二设备监听第一响应；或者，当获取到第一信息，第二设备监听第一响应。
在一些可能的实现方式中，第一设备指示第一信息，包括：
第一设备通过系统消息指示第一信息；或者，
第一设备通过信息元素IE指示第一信息，IE用于配置四步随机接入过程参数或两步随机接入过程参数；或者，
第一设备通过介质访问控制层控制元素MAC CE指示第一信息。
在一些可能的实现方式中，该方法还包括：
当第一信息包括第一子信息、第二子信息、第三子信息和第四子信息中的至少一项，且第一子信息、第二子信息、第三子信息和第四子信息中的至少一项的指示为是，第二设备监听第一响应；或者，
当获取到第一信息，第二设备监听第一响应。
在一些可能的实现方式中，第二设备监听第一响应，包括：
第二设备开启定时器，在定时器运行过程中监听第一响应。
在一些可能的实现方式中，第二设备监听第一响应，包括：
针对四步随机接入，第二设备开启第一定时器，在第一定时器运行过程中监听第一响应；或，
针对两步随机接入，第二设备开启第二定时器，在第二定时器运行过程中监听第一响应。
在一些可能的实现方式中，第一信息包括第五子信息、第六子信息和第七子信息中的至少一项，第二设备监听到第一响应，该方法还包括：
当重传次数计数器的计数结果小于盲重传阈值(或者是盲重传阈值加1)，则第二设备更新计数结果；或者，
当重传次数计数器的计数结果大于或等于盲重传阈值(或者是盲重传阈值加1)，则第二设备确定第一响应接收成功。
在一些可能的实现方式中，重传次数计数器包括应用于四步随机接入的第一重传次数计数器，该方法包括：
当第一重传次数计数器的计数结果小于盲重传阈值，则第二设备更新第一重传次数计数器的计数结果；或者，
当第一重传次数计数器的计数结果大于或等于盲重传阈值(或者是盲重传阈值加1)，则第二设备确定第一响应接收成功。
在一些可能的实现方式中，重传次数计数器包括应用于两步随机接入的第二重传次数计数器，方法包括：
当第二重传次数计数器的计数结果小于盲重传阈值(或者是盲重传阈值加1)，则第二设备更新第二重传次数计数器的计数结果；或者，
当第二重传次数计数器的计数结果大于或等于盲重传阈值(或者是盲重传阈值加1)，则第二设备确定第一响应接收成功。
在一些可能的实现方式中，该方法还包括：
当定时器超时，第二设备停止监听第一响应。
在一些可能的实现方式中，当定时器超时，该方法还包括：
当重传次数计数器的计数结果小于第一阈值，或接收到与随机接入使用前导码对应的响应次数小于第一阈值，更新前导码传输计数器的计数结果，并在前导码传输计数器的计数结果小于或等于前导码的最大发送次数时，重新选择随机接入资源；或者，
当重传次数计数器的计数结果大于或等于第一阈值，结束随机接入流程。
在一些可能的实现方式中，该方法还包括：
在随机接入响应窗口监听到第二响应，第二设备确定第二响应是否为仅包括前导码标识RAPID的介质访问控制MAC数据包，若否，则第二设备确定是否获取到第一信息。
在一些可能的实现方式中，该方法还包括：
第二设备确定随机接入是否为基于竞争的随机接入，若是，则第二设备确定是否获取到第一信息。
在一些可能的实现方式中，第一响应包括第一子信息、第二子信息、第三子信息、第四子信息中的至少一项，和/或第五子信息、第六子信息、第七子信息中的至少一项。
在一些可能的实现方式中，第二响应包括第一子信息、第二子信息、第三子信息、第四子信息中的至少一项，第五子信息、第六子信息、第七子信息中的至少一项，和/或空余比特位中的中至少一项。
本申请的第五方面提供一种电子设备，包括：存储器以及至少一个处理器。存储器用于存储程序，至少一个处理器用于运行程序，以使得电子设备实现本申请的第一方面、或者第二方面提供的随机接入方法。
本申请的第六方面提供一种通信系统，包括第一设备和第二设备，第一设备和第二设备用于实现本申请的第三方面、或者第四方面提供的随机接入方法。
本申请的第七方面一种计算机存储介质，用于存储计算机程序，计算机程序被执行时，用于实现本申请的第二方面、或者第三方面提供的随机接入方法。
附图说明
图1为本申请实施例公开的一种基站与终端通信的场景示例图；
图2为本申请实施例公开的一种四步随机接入的流程图；
图3为本申请实施例公开的一种两步随机接入回退的流程图；
图4为本申请实施例公开的一种随机接入的时间轴；
图5为本申请实施例公开的一种随机接入方法的流程图；
图6为本申请实施例公开的一种随机接入方法中监听第一响应的流程图；
图7为本申请实施例公开的一种随机接入方法的前处理流程示意图；
图8为本申请实施例公开的一种随机接入方法的后处理流程示意图；
图9为本申请实施例公开的另一种随机接入方法的后处理流程示意图；
图10为本申请实施例公开的另一种随机接入方法的流程图；
图11A至图11C为本申请实施例公开的初始随机接入响应RAR的结构示意图；
图12A至图12C为本申请实施例公开的后续随机接入响应RAR的结构示意图；
图13A为本申请实施例公开的一种四步随机接入场景中随机接入方法的流程图；
图13B为本申请实施例公开的一种四步随机接入的时间轴；
图14A为本申请实施例公开的一种两步随机接入场景中随机接入方法的流程图；
图14B为本申请实施例公开的一种两步随机接入的时间轴；
图15为本申请实施例公开的一种电子设备的结构示例图；
图16为本申请实施例公开的另一种电子设备的结构示例图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。以下实施例中所使用的术语只是为了描述特定实施例的目的，而并非旨在作为对本申请的限制。如在本申请的说明书和所附权利要求书中所使用的那样，单数表达形式“一个”、“一种”、“所述”、“上述”、“该”和“这一”旨在也包括例如“一个或多个”这种表达形式，除非其上下文中明确地有相反指示。还应当理解，在本申请实施例中，“一个或多个”是指一个、两个或两个以上；“和/或”，描述关联对象的关联关系，表示可以 存在三种关系；例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B的情况，其中A、B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系。
在本说明书中描述的参考“一个实施例”或“一些实施例”等意味着在本申请的一个或多个实施例中包括结合该实施例描述的特定特征、结构或特点。由此，在本说明书中的不同之处出现的语句“在一个实施例中”、“在一些实施例中”、“在其他一些实施例中”、“在另外一些实施例中”等不是必然都参考相同的实施例，而是意味着“一个或多个但不是所有的实施例”，除非是以其他方式另外特别强调。术语“包括”、“包含”、“具有”及它们的变形都意味着“包括但不限于”，除非是以其他方式另外特别强调。
本申请实施例涉及的多个，是指大于或等于两个。需要说明的是，在本申请实施例的描述中，“第一”、“第二”等词汇，仅用于区分描述的目的，而不能理解为指示或暗示相对重要性，也不能理解为指示或暗示顺序。
通信系统包括第一设备和第二设备。第一设备可以是网络侧用于提供网络通信功能的设备，有些情况下也称作网络设备、网元，网络设备通常可以是基站，基站的功能单元，或者是基站的功能单元的组合，第二设备可以是接入网络的设备，通常可以为终端。通信系统的一种示例如图1所示，图1中包括基站1与终端2。
通信系统包括网络设备和终端。其中，网络设备是网络侧用于提供网络通信功能的设备，有些情况下也称作网元，网络设备通常可以是基站，基站的功能单元，或者是基站的功能单元的组合。通信系统的一种示例如图1所示，图1中包括基站1与终端2。
在本申请提供的实施例中，基站可以是具有无线收发功能的任意一种设备，包括但不限于：长期演进(long term evolution，LTE)中的演进型基站(NodeB或eNB或e-NodeB，evolutional Node B)，新无线(new radio，NR)中的基站(gNodeB或gNB)或收发点(transmission receiving point/transmission reception point，TRP)，3GPP后续演进的基站，Wi-Fi系统中的接入节点，无线中继节点，无线回传节点等。基站可以是：宏基站，微基站，微微基站，小站，中继站，或气球站等。基站可以包含一个或多个共站或非共站的传输点(Transmission Reception Point，TRP)。基站还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器、集中单元(centralized unit，CU)，和/或分布单元(distributed unit，DU)。基站可以与终端进行通信，也可以通过中继站与终端进行通信。终端可以与不同技术的多个基站进行通信，例如，终端可以与支持LTE网络的基站通信，也可以与支持5G网络的基站通信，还可以与支持LTE网络的基站以及5G网络的基站进行双连接。
在本申请提供的实施例中，终端可以是各种形式，例如，手机(mobile phone)、平板电脑(Pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、工业控制(industrial control)中的无线终端、车载终端设备、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端、可穿戴终端设备等等。终端有时也可以称为终端设备、用户设备(user equipment，UE)、接入终端设备、车载终端、工业控制终端、UE单元、UE站、移动站、移动台、远方站、远程终端设备、移动设备、UE终 端设备、终端设备、无线通信设备、UE代理或UE装置等。终端也可以是固定终端或者移动终端。
终端2和网络侧的基站1之间建立无线链路，通过无线链路进行数据交互操作通常需要先进行随机接入(random access)。随机接入是指从用户通过物理随机接入信道(Physical Random Access Channel，PRACH)发送随机接入前导码(Random Access Preamble，也可以简称前导码preamble)，开始尝试接入网络到与网络间建立起基本的信令连接之前的过程。
PRACH是终端2开始发起呼叫时的接入信道。在终端2接收到来自网络设备的随机接入响应消息后，终端会根据网络设备指示的信息，在PRACH信道发送无线资源控制(radio resource control，RRC)连接请求消息，以建立RRC连接。通常，一个PRACH可以包含一个preamble。preamble是一个长度为L_RA的Zadd Off Chu(ZC)序列：{x(0),x(1),…x(L_RA-1)}。preamble可以分为两大类：长前导码(long preamble)和短前导码(short preamble)。其中，长前导码分为四种格式(format)，分别为：format0、format1、format2和format3；短前导码分为九种，分别为：A1、A2、A3、B1、B2、B3、B4、C0和C2。在时域上，一个preamble包括：一个循环前缀(cyclic prefix，CP)，一个前导序列(preamble sequence)，以及一段空余的保护周期(guard period)。
图2展示了一种随机接入的流程，图2以四步随机接入示例说明，如图2所示，终端2通过PRACH向基站1发送第一消息(记作MSG1)，其中，第一消息指示有本次随机接入使用的前导码preamble。具体地，第一消息可以携带随机前导码标识(Random Access Preamble Identifier，RAPID)，其中，RAPID也可以称为前导码标识，用于指示本次随机接入使用的前导码标识。在第一消息中，RAPID可以占至少一个bit位，例如RAPID可以占6个bit位，相应地，RAPID的取值范围可以为0至63(包括端点值)。基站1可以在PRACH中盲检前导码，如果检测到了前导码，则可以在随机接入响应窗口内，通过物理下行共享信道(Physical Downlink Shared Channel，PDSCH)反馈第二消息(记作MSG2)，具体是随机接入响应(Radom Access Response，RAR)。
RAR中可以包括：MSG1中的preamble(供终端2匹配操作)、终端2上行定时提前量(Timing Advance，TA)、backoff回退参数(重新发起Preamble码应延迟再次接入的时间)、为传输第三消息(记作MSG3)分配的物理上行共享信道(Physical Uplink Shared Channel，PUSCH)调度信息UL_Grant(包括是否跳频、调制编码率、接入资源和接入时刻等内容)、Temple C-RNTI(供MSG3加扰使用)。
终端2可以根据RAR中的TA获得上行同步，并在基站1为其分配的上行资源中传输第三消息MSG3，以便进行后续的数据传输。其中，MSG3可以携带RRC建链请求(RRC Connection Request)或者RRC重建请求(RRC Connection Re-establishment Request)。因此，第三消息也称作调度传输(scheduled transmission)消息。基站1通过下行资源向终端2发送第四消息(记作MSG4)，具体为竞争解决(contention resolution)消息。
在四步随机接入过程中，终端2在发送MSG1后可以开启RAR窗口监听RAR，当成功监听到RAR，可以停止RAR window，并发送MSG3，在发送MSG3时可以开启竞争解 决窗口，如果在竞争解决窗口的时间范围内监听到竞争解决消息即MSG4，则随机接入过程结束。
图3展示了一种简化的随机接入流程，该简化的随机接入流程为两步随机接入，如图3所示，在基站1进行前导码分配后，例如是分配用于两步随机接入的前导码以及分配用于四步随机接入的前导码后，终端2通过PRACH向基站1发送消息A(记作message A，简称为MSGA)。MSGA包括随机接入前导码random access preamble和物理上行共享信道的载荷PUSCH payload，相当于将四步随机接入的MSG1和MSG3打包发送。基站1在接收到前导码和PUSCH payload，可以向终端2发送消息B(记作message B，简称为MSGB)，MSGB为网络侧对终端2发送的MSGA的响应。MSGB的内容取决于基站1是否能够成功地检测到PRACH承载的前导码和PUSCH payload。如果基站1检测到前导码和PUSCH payload并解码成功，则基站1可以在MSGB中包括一个success RAR，以完成竞争解决；如果基站1检测到前导码但未检测到PUSCH payload或者PUSCH payload解码失败，则基站1可以在MSGB中包括回退指示(fallback indication)，其中，回退指示也称作回退随机接入响应(fallback RAR)，用于请求终端2再次发送PUSCH payload，例如是再次发送MSG3。如图3所示，基站1返回fallback indication，然后终端2向基站1发送第三消息MSG3，即调度传输(scheduled transmission)消息，接收基站1返回的竞争解决消息。需要说明的是，图3以两步随机接入过程中的一次随机接入尝试示例说明，两步随机接入过程也可以包括多次随机接入尝试。
两步随机接入减少了在连接建立和连接恢复期间，终端(如UE)和网络之间的交互次数，从而使得IDLE和INACTIVE的UE的控制平面时延更低。在连接模式的情况下，可以通过两步RACH信道发送少量数据，从而使得用于连接态模式UE的上行用户面数据的时延更低。
在网络信道环境比较差的情况下，网络侧(如基站1)执行可以MSG3的盲调度。其中，调度MSG3的是RAR(包括四步随机接入的RAR或者两步随机接入的fallback RAR)，因此，MSG3的盲调度是指在没有接收到MSG3的情况下连续地发送RAR(如四步随机接入的RAR或者两步随机接入的fallback RAR)。相应地，终端可以重传MSG3，因此，MSG3的盲调度也可以称为MSG3的盲重传。
以非地面网络(Non-terrestrial Network，NTN)场景对盲重传过程示例说明。在卫星和高空平台(High-Altitude Platforms，HAP)参与布网的场景下，数据传输的往返时延(round-trip delay，RTT)较大。其中，NTN场景下数据传输的往返时延可以达到地面网络(terrestrial network，TN)场景下数据传输的往返时延的几十甚至几百倍。在UE等终端传输数据之后，往往要经过十几甚至几百毫秒(millisecond，ms)的时长才可以接收到网络侧调度。因此在以上随机接入过程中，如图4所示，UE可以在发送完第一消息MSG1之后不立即开启RAR窗口，而是经过一个往返时延RTT再开启RAR窗口，同时在发送完第三MSG3之后，经过一个往返时延之后开启竞争解决窗口。
当网络侧进行MSG3的盲调度的情况下，例如是网络侧的基站等网络设备在没有接收到MSG3情况下连续发送RAR进行MSG3调度，指示UE重传MSG3，在经过一个较长的RTT后开启RAR窗口可以导致UE侧无法监听到MSG3的初始调度。
进一步地，UE接收到初始RAR(初始RAR可以视为MSG3的初次调度)的情况下停止RAR窗口，可以导致UE难以监听后续物理下行控制信道(Physical Downlink Control Channel，PDCCH)，进而导致很难监听MSG3的后续调度。
针对上述问题，本申请提供一种随机接入方法。该方法通过指示第一信息，该第一信息对应于随机接入中第三消息的盲重传信息，例如可以包括以下至少一项子信息：第一子信息、第二子信息、第三子信息、第四子信息、第五子信息、第六子信息、第七子信息。其中，第一子信息用于指示是否进行随机接入中第三消息的盲重传，第二子信息用于指示是否进行四步随机接入中第三消息的盲重传的第二子信息，第三子信息用于指示是否进行两步随机接入中第三消息的盲重传的第三子信息，第四子信息用于指示是否进行两步随机接入中第三消息的盲重传，第五子信息用于指示随机接入中第三消息的盲重传阈值(或称作盲调度阈值，指示最大重传次数或最大调度次数)，第六子信息用于指示四步随机接入中第三消息的盲重传阈值，第七子信息用于指示两步随机接入中第三消息的盲重传阈值。
其中，第五子信息还可以隐含指示进行随机接入中第三消息的盲重传，第六子信息还可以隐含指示进行四步随机接入中第三消息的盲重传，第七子信息还可以隐含指示进行两步随机接入中第三消息的盲重传。
如此，即使在网络信道较差的情况(例如是NTN场景)下，UE等终端也可以监听到网络侧的MSG3盲重传指示，进而基于该指示进行MSG3的盲重传，提高随机接入成功率，缩短随机接入时间，减少随机接入资源占用，进而降低终端的功耗。
图5为本申请实施例公开的一种随机接入方法，在图5所示的流程中，包括如下步骤：
S502、获取第一信息。
该步骤可以由第二设备执行。第二设备可以是终端。在一些可能的实现方式中，第一信息可以由第一设备指示。第一设备可以是网络设备，网络设备可以为基站。在另一些可能的实现方式中，第一信息也可以由第二设备的高层(例如应用层)配置或者下发，即第二设备通过自身进行第一信息获取，这种情况下，第二设备可以上报该第一信息到第一设备，以便第二设备可以获知该第一信息。
第一信息对应于随机接入中第三消息MSG3的盲重传信息。MSG3的盲重传是指网络侧(如基站等网络设备)在未接收到MSG3的情况下连续发送RAR，以指示终端侧进行MSG3的重传。
MSG3的重传存在于以下随机接入过程中：四步随机接入；两步随机接入(具体是网络侧未成功接收PUSCH payload，向终端侧发送fallback RAR的情况下的随机接入过程)。相应地，MSG3的盲重传可以应用于如下场景：基于竞争的四步随机接入；MSGB包括fallback RAR的两步随机接入。考虑到一次随机接入过程可以包括多次随机接入尝试，四步随机接入可以包括两步随机接入过程中切换后的四步随机接入尝试。
基于此，第一信息可以包括以下至少一项子信息：第一子信息、第二子信息、第三子信息、第四子信息、第五子信息、第六子信息或第七子信息。上述子信息可以直接或间接指示进行MSG3的盲重传，或不进行MSG3的盲重传。
第一子信息用于指示是否进行随机接入中MSG3的盲重传。其中，第一子信息指示进行随机接入中MSG3的盲重传，可以视为指示在四步随机接入(例如是基于竞争的四步随机接入)以及两步随机接入(例如是MSGB包括fallback RAR的二步随机接入)中均进行MSG3的盲重传。进一步地，第一子信息指示不进行随机接入中MSG3的盲重传，可以视为上述四步随机接入以及两步随机接入中均不进行MSG3的盲重传。当说明该第一子信息仅应用于四步随机接入时，则第一子信息指示的内容仅应用在四步随机接入，即四步随机接入进行MSG3的盲重传或者四步随机接入不进行MSG3的盲重传；当说明该第一子信息仅应用于两步随机接入时，则第一子信息指示的内容仅应用在两步随机接入，即两步随机接入进行MSG3的盲重传或者两步随机接入不进行MSG3的盲重传。
第二子信息用于指示是否进行四步随机接入中MSG3的盲重传，例如是基于竞争的四步随机接入中MSG3的盲重传。其中，第二子信息指示进行四步随机接入中MSG3的盲重传，可以视为指示在四步随机接入中进行MSG3的盲重传。进一步地，第二子信息指示不进行随机接入中MSG3的盲重传，可以视为上述四步随机接入中不进行MSG3的盲重传。
第三子信息用于指示是否进行两步随机接入中MSG3的盲重传，例如是MSGB包括fallback RAR的两步随机接入中MSG3的盲重传。其中，第二子信息指示进行二步随机接入中MSG3的盲重传，可以视为指示在二步随机接入中进行MSG3的盲重传。进一步地，第二子信息指示不进行二步随机接入中MSG3的盲重传，可以视为上述二步随机接入中不进行MSG3的盲重传。
第四子信息用于指示是否进行四步随机接入中的MSG3的盲重传以及是否进行两步随机接入中MSG3的盲重传。具体地，第四子信息可以包括多个指示内容，第一指示内容用于指示是否进行四步随机接入中MSG3的盲重传，第二指示内容用于指示是否进行两步随机接入中MSG3的盲重传。其中，第四子信息与第一信息的区别在于，第四子信息不仅可以指示两步随机接入与四步随机接入均进行盲重传或均不进行盲重传，也可以指示两步随机接入进行盲重传，四步随机接入不进行盲重传，或者是四步随机接入进行盲重传，两步随机接入不进行盲重传。其中，第四子信息可以通过多个bit位表示，或者通过位图(bitmap)表示。通过bit位或者位图进行表示时，第四子信息的数据结构为bit字符串，大小为2，表示为BIT STRING(SIZE(2))。在一种实现方式中，bit设置为1时，可以为“是”的情况，bit设置为0时，可以为“否”的情况，同时在另一种实现方式中，bit设置为1时，可以为“否”的情况，bit设置为0时，可以为“是”的情况。
在一种实现方式中，bit字符串的第一个bit指示是否进行四步随机接入中的MSG3的盲重传，当该bit设置为1，则指的“是”的情况，即进行四步随机接入中的MSG3的盲重传，当该bit设置为0，则指的“否”的情况，即不进行四步随机接入中的MSG3的盲重传；第二个bit指示是否进行两步随机接入中的MSG3的盲重传，当该bit设置为1，则指的“是”的情况，即进行两步随机接入中的MSG3的盲重传，当该bit设置为0，则指的“否”的情况，即不进行两步随机接入中的MSG3的盲重传。
在另一种实现方式中，bit字符串的第一个bit指示是否进行两步随机接入中的MSG3的盲重传，当该bit设置为1，则指的“是”的情况，即进行两步随机接入中的MSG3的盲重传，当该bit设置为0，则指的“否”的情况，即不进行两步随机接入中的MSG3的盲重 传；第二个bit指示是否进行四步随机接入中的MSG3的盲重传，当该bit设置为1，则指的“是”的情况，即进行四步随机接入中的MSG3的盲重传，当该bit设置为0，则指的“否”的情况，即不进行四步随机接入中的MSG3的盲重传。
以上实现方式仅仅是bit字符串的一些具体示例，本实施例对此不作限制。
第五子信息用于指示随机接入中MSG3的盲重传阈值。其中，盲重传阈值可以指示盲重传过程的最大重传次数。第五子信息可以指示一个盲重传阈值(该情况下，两步随机接入和四步随机接入可以共享)，第五子信息也可以指示两个盲重传阈值，包括四步随机接入中MSG3的盲重传阈值和两步随机接入中MSG3的盲重传阈值。当说明该第五子信息仅应用于四步随机接入时，则第五子信息指示的内容仅应用在四步随机接入，即第五子信息指示四步随机接入中MSG3的盲重传阈值；当说明该第五子信息仅应用于两步随机接入时，则第五子信息指示的内容仅应用在两步随机接入，即第五子信息指示两步随机接入中MSG3的盲重传阈值。
第六子信息用于指示四步随机接入中MSG3的盲重传阈值。第六子信息可以指示一个盲重传阈值，该盲重传阈值应用于四步随机接入。在一些示例中，第六子信息可以包括应用于四步随机接入的盲重传阈值。在另一些示例中，第六子信息可以包括四步随机接入阈值参数，基于该四步随机接入阈值参数可以确定应用于四步随机接入的盲重传阈值。
第七子信息用于指示两步随机接入中MSG3的盲重传阈值。第七子信息可以指示一个盲重传阈值，该盲重传阈值应用于两步随机接入。在一些示例中，第七子信息可以包括应用于两步随机接入的盲重传阈值。在另一些示例中，第七子信息可以包括两步随机接入阈值参数，基于该两步随机接入阈值参数可以确定应用于两步随机接入的盲重传阈值。
需要说明的是，上述第五子信息、第六子信息、第七子信息隐含指示进行MSG3的盲重传。例如，第五子信息间接指示进行MSG3的盲重传，在没有额外说明的情况下，第五子信息间接指示四步随机接入和两步随机接入中均进行MSG3的盲重传，第六子信息间接指示四步随机接入进行MSG3的盲重传，第七子信息间接指示进行MSG3的盲重传。
当第一信息由第一设备指示，例如是第一设备通过系统消息、信息元素(information element，IE)或介质访问控制层控制元素(medium access control control element，MAC CE)中的至少一项进行指示时，第二设备可以通过系统消息获取第一信息，通过信息元素IE获取第一信息，或者是通过MAC CE获取第一信息。例如，系统消息、IE或者MAC CE中的至少一项携带第一信息中的至少一项子信息时，第二设备可以读取系统消息、IE或者MAC CE中的至少一项，获得第一信息。又例如，系统消息、IE或者MAC CE中的至少一项携带用于确定第一信息的参数时，第二设备可以读取系统消息、IE或者MAC CE中的至少一项，获得用于确定第一信息的参数，然后根据该参数获得第一信息。
系统消息可以包括但不限于系统信息块(systeminformation block，SIB)，例如是SIB1。
系统消息可以指示上述第一子信息、第二子信息、第三子信息、第四子信息、第五子信息、第六子信息或第七子信息的至少一项。
信息元素IE用于配置随机接入过程参数。进一步地，信息元素可以分为用于配置四步随机接入过程参数的信息元素(记作RACH-ConfigCommon)、用于配置两步随机接入过程参数的信息元素(记作RACH-ConfigCommonTwoStepRA)，换言之，信息元素可以用 于配置四步随机接入过程参数或两步随机接入过程参数。其中，信息元素RACH-ConfigCommon可以指示上述第一子信息、第二子信息、第五子信息或第六子信息中的至少一项，信息元素RACH-ConfigCommon可以指示上述第一子信息、第三子信息、第五子信息或第七子信息中的至少一项。
MAC CE可以包括四步随机接入中的RAR或两步随机接入中的fallback RAR。其中，MAC CE包括四步随机接入中的RAR的情况下，MAC CE可以指示第一子信息、第二子信息、第五子信息或第六子信息中的至少一项；MAC CE包括两步随机接入中的fallback RAR的情况下，MAC CE可以指示第一子信息、第三子信息、第五子信息或第七子信息中的至少一项。
第一信息也可以由第二设备获取。第二设备可以获取目标功率，当第二设备测量的参考信号接收功率(Reference Signal Received Power，RSRP)小于目标功率，则获知需要进行随机接入中MSG3的盲重传，即获取到MSG3的盲重传的第一信息。其中，第二设备还可以上报该第一信息，以便于第一设备获知第一信息。第二设备可以通过MSG1消息进行上报。具体地，第一设备可以接收第二设备发送的MSG1消息，通过对链路的评估获知第二设备的RSRP，因此可以得知第一信息。
需要说明的是，上述第一信息中的子信息的指示内容可以是针对终端，或者是针对小区。换言之，本申请实实施例中MSG3的盲重传可以是基于终端的MSG3的盲重传，或者是基于小区的MSG3的盲重传。以NTN小区示例说明，NTN小区内终端的参考信号接收功率(Reference Signal Received Power，RSRP)差异较小，例如是小于目标功率，网络侧(例如是基站等网络设备)在进行MSG的盲调度时，则可以对NTN小区内的终端执行MSG3的盲调度，换言之，网络侧可以通过第一信息指示NTN小区内的终端进行MSG3的盲重传。
S504、监听第一响应。
该步骤可以由第二设备执行。第二设备可以是终端。在一种实现方式中，第二设备获取到上述第一信息，即为第二设备获知到上述的第一信息(例如是指示随机接入过程进行MSG3的盲重传的第一信息)情况下，第二设备会执行监听第一响应。在另一种实现方式中，第二设备也可以根据自身获知进行MSG3的盲重传，例如，第二设备测量的RSRP小于目标功率，则第二设备获知需要进行MSG3的盲重传，第二设备可以执行监听第一响应。
在一些可能的实现方式中，第一子信息、第二子信息、第三信息、第四子信息、第五子信息、第六子信息、第七子信息为可选项，第一设备可以通过上述第一子信息、第二子信息、第三信息、第四子信息中至少一项的携带情况，和/或第五子信息、第六子信息、第七子信息中至少一项的携带情况指示是否进行MSG3的盲重传。例如，当第一信息携带上述至少一个子信息，例如包括至少一个子信息的标志位，则指示进行MSG3的盲重传。相应地，终端可以在获取到上述第一信息，监听第一响应。
在另一些可能的实现方式中，第一子信息、第二子信息、第三信息、第四子信息可以通过不同指示值(例如是0、1或者布尔值或者true、false)来分别指示进行MSG3的盲重传、不进行MSG3的盲重传。基于此，当所述第一信息包括所述第一子信息、所述第二子信息、所述第三子信息和所述第四子信息中的至少一项，且所述第一子信息、所述第二子 信息、所述第三子信息和所述第四子信息中的至少一项的指示为是，终端监听第一响应。
由于第一信息中的至少一项子信息可以指示是否进行随机接入中MSG3的盲重传，即使在网络信道较差的情况(例如是NTN场景)下，UE等终端也可以监听到网络侧的MSG3盲重传指示，进而基于该指示进行MSG3的盲重传，提高随机接入成功率，缩短随机接入时间，减少随机接入资源占用，进而降低终端的功耗。
接下来，对监听第一响应的过程进行详细说明。
参见图6所示的一种随机接入方法的流程图，该方法包括如下步骤：
S602、开启定时器。
S604、在定时器运行过程中，监听第一响应。
上述S602、S604可以由第二设备执行。第二设备可以是终端，用于监听第一响应，进行MSG3的盲重传。
在一些可能的实现方式中，定时器可以设置开启条件。当开启条件被满足时，可以开启定时器。具体地，开启条件可以为在随机响应窗口监听到第二响应，且获知需要进行MSG3的盲调度。
其中，第二响应是指初始响应，例如为本次随机接入过程中的第一个响应，包括第一个RAR和/或第一个fallback RAR。第一响应可以是初始响应之后的响应，基于此，第一响应也称作后续响应。类似地，第一响应可以为本次随机接入中的第i(i大于1)个响应，例如是第2个响应、第3个响应……第N个响应，包括第2个RAR、第3个RAR……第N个RAR(可以统称为第一RAR)和/或第2个fallback RAR、第3个fallback RAR……第N个fallback RAR(可以统称为第一fallback RAR)。
第二设备在随机接入响应窗口监听到响应时，可以识别该响应是否为与发送的前导码或前导码标识对应的第一个响应。若是，则表示监听到第二响应；若否，则表示未监听到第二响应。此外，第二设备还可以确定是否获取到第一信息。例如，第二设备可以从第二响应获取第一信息，并确定是否获取到该第一信息。在一些示例中，第二设备获取到第一信息，即可获知需要进行MSG3的盲调度。在另一些示例中，第二设备获取到第一信息，且第一信息包括第一子信息、第二子信息、第三子信息、第四子信息中的至少一项，且至少有一项的指示为是，第二设备可以获知需要进行MSG3的盲调度。第二设备也可以获取自身测量的RSRP，当RSRP小于目标功率，则第二设备可以获知需要进行MSG3的盲调度。
考虑到MSG3的盲重传可以应用于四步随机接入或两步随机接入，终端可以针对四步随机接入、两步随机接入分别开启定时器。具体地，针对四步随机接入，终端可以开启第一定时器，终端可以在所述第一定时器运行过程中监听第一响应。其中，第一定时器可以用于监听第一RAR或第一RAR的PDCCH，因此，终端可以在第一定时器运行过程中监听第一RAR。针对两步随机接入，终端可以开启第二定时器，终端可以在第二定时器运行过程中监听第一响应。第二定时器用于监听第一fallback RAR或第一fallback RAR的PDCCH，因此，终端可以在第二定时器运行过程中监听第一fallback RAR。第一响应包括第一RAR和/或第一fallback RAR。
上述S602至S604为图5所示实施例中S504的一种实现方式，在本申请实施例其他可能的实现方式中，也可以通过其他方式实现监听第一响应，例如第二设备也可以开启新的随机接入响应窗口，在新的随机接入响应窗口监听第一响应。
需要说明的是，图6所示实施例可以单独实施，也可以与其他实施例结合，本申请对此不作限制。
接收到第二RAR时，还可以识别随机接入是否完成，若是，则可以不执行上述S602、S604，若否，则可以确定是否获取到第一信息，然后在获取到第一信息(指示进行MSG3的盲调度)的情况下，执行上述S602、S604。
参见图7所示的一种随机接入方法的前处理流程示意图，具体包括如下步骤：
S702：在随机接入响应窗口监听到第二响应，确定第二响应是否为仅包括RAPID的MAC数据包。若否，则执行S703；若是，则执行S706。
S702可以由第二设备执行。第二设备(例如UE等终端)可以解析第二响应(如初始RAR)，从而确定第二响应是否为仅包括RAPID的MAC数据包。其中，第二响应为仅包括RAPID的MAC数据包，表示随机接入完成，可以执行S706以结束随机接入流程，无需再执行图6所示实施例的流程。第二响应不是仅包括RAPID的MAC数据包，例如第二响应还包括TA、为传输MSG3分配的PUSCH调度信息UL_Grant(包括是否跳频、调制编码率、接入资源和接入时刻等内容)，则表示随机接入未完成，可以执行图6所示实施例的流程。在一些可能的实现方式中，还可以执行S703，以确认随机接入是否完成，当随机接入未完成，再执行图6所示实施例的流程。
S703：确定随机接入是否为基于竞争的随机接入。若是，则执行S704；若否，则执行S706。
S703可以由第二设备执行。第二设备(例如UE等终端)可以通过随机接入使用的前导码是否为基于竞争的前导码，例如是否为竞争的码资源池中的前导码，从而确定随机接入是否为基于竞争的随机接入。若是，则表示随机接入未完成，可以执行S704，进而在获取到第一信息(指示进行MSG3的盲重传)的情况下，执行图6所示实施例的流程。若否，则表示随机接入完成，可以执行S706以结束随机接入流程，无需再执行图6所示实施例的流程。
上述S703为本申请实施例的可选步骤，执行本申请实施例的方法也可以不执行S703。当S702的执行结果为否，可以直接执行S704，当S702的执行结果为是，可以执行S706。例如，在四步随机接入场景中，可以在S702的执行结果为否时，还执行上述S703，并在S703的执行结果为是时执行S704，在两步随机接入场景中，可以在S702的执行结果为否时，执行S704。
S704：确定是否获取到第一信息。
S706：随机接入完成。
需要说明的是，执行本申请实施例的随机接入方法也可以不执行上述判断步骤，例如第二设备可以不执行确定第二响应是否为仅包括RAPID的MAC数据包的步骤，通过其他方式获知第二响应为仅包括RAPID的MAC数据包，或者第二响应不是仅包括RAPID的 MAC数据包。当第二响应并非仅包括RAPID的数据包，表示随机接入未完成，可以执行随机接入的后续流程，当第二响应为仅包括RAPID的数据包，表示随机接入完成，可以结束随机接入流程。类似地，第二设备可以不执行确定随机接入是否为基于竞争的随机接入的步骤，通过其他方式获知当前随机接入为基于竞争的随机接入或非竞争的随机接入。当随机接入为基于竞争的随机接入，表示随机接入未完成，可以执行随机接入的后续流程。当随机接入为非竞争的随机接入，表示随机接入完成，可以结束随机接入流程。同理，第二设备可以不执行确定是否获取到第一信息的步骤，第二设备可以在获取到第一信息时，执行监听第一响应的步骤或流程。
该方法通过执行上述随机接入流程，识别随机接入是否完成，从而在随机接入未完成的情况下再执行图6所示实施例的流程，避免资源浪费。
图7所示实施例可以单独实施，或者是与其他实施例结合。例如，第二响应为仅包括RAPID的MAC数据包，或者随机接入为非竞争的随机接入，则图7所示实施例可以单独实施。又例如，第二响应并非仅包括RAPID的MAC数据包，或者是随机接入为基于竞争的随机接入，则图7实施例还可以与图6所示实施例或图5所示实施例结合。在一些可能的实现方式中，图7实施例也可以与后续实施例结合。
图6、图7所示实施例对监听流程、监听的前处理流程进行了介绍，在一些可能的实现方式中，还可以执行监听的后处理流程。
参见图8所示的一种随机接入方法的后处理流程示意图，具体包括如下步骤：
S802：当监听到第一响应，确定重传次数计数器的计数结果是否小于盲重传阈值。若是，则执行S804；若否，则执行S806。
S804：更新重传次数计数器的计数结果。
S806：确定第一响应接收成功。
上述S802至S806可以由第二设备执行。第二设备可以是终端。具体地，第二设备可以定义新的变量，例如为重传次数计数器，该重传次数计数器用于对MSG3的盲重传次数(或者称作MSG3的盲调度次数、响应接收次数)进行计数，其初始值可以为0或1。
当监听到第一响应时，第二设备可以获取当前变量值，例如实时获取重传次数计数器的计数结果，确定重传次数计数器的计数结果是否小于盲重传阈值(或者是盲重传阈值加1)。其中，盲重传阈值可以是第一信息中的第五子信息、第六子信息或第七子信息中的至少一项指示。若是，则可以更新上述变量，即更新重传次数计数器的计数结果。例如，第二设备可以对重传次数计数器加1，从而更新重传次数计数器的计数结果。若否，即重传次数计数器的计数结果大于或等于盲重传阈值(或者是盲重传阈值加1)，例如是等于盲重传阈值加1或者等于盲重传阈值，则确定第一响应接收成功，在该情况下，第二设备可以停止监听第一响应，例如第二设备可以停止定时器，从而停止监听第一响应。其中，重传次数计数器的初始值为0时，第二设备可以在重传次数计数器的计数结果等于盲重传阈值时，确定第一响应接收成功。重传次数计数器的初始值为1时，第二设备可以在重传次数计数器的计数结果等于盲重传阈值加1时，确定第一响应接收成功。
在一些可能的实现方式中，还可以针对不同随机接入，分别设置不同的重传次数计数 器。例如，针对四步随机接入，设置第一重传次数计数器，针对两步随机接入，设置第二重传次数计数器。
在四步随机接入场景，当所述第一重传次数计数器的计数结果小于所述盲重传阈值(或者是盲重传阈值加1)，则更新所述第一重传次数计数器的计数结果，当所述第一重传次数计数器的计数结果大于或等于盲重传阈值(或者是盲重传阈值加1)，例如第一重传次数计数器的计数结果等于盲重传阈值，或者第一重传次数计数器的计数结果等于盲重传阈值加1，则确定第一响应(如第一RAR)接收成功。第一响应接收成功的情况下，第二设备可以停止监听第一响应，例如可以停止第一定时器，从而停止监听第一响应。
在两步随机接入场景，当所述第二重传次数计数器的计数结果小于盲重传阈值(或者是盲重传阈值加1)，则更新所述第二重传次数计数器的计数结果，当所述第二重传次数计数器的计数结果大于或等于所述盲重传阈值(或者是盲重传阈值加1)，例如第二重传次数计数器的计数结果等于盲重传阈值，或者第二重传次数计数器的计数结果等于盲重传阈值加1，则确定第一响应(如第一fallback RAR)接收成功。第一响应接收成功的情况下，第二设备可以停止监听第一响应，例如可以停止第二定时器，从而停止监听第一响应。
需要说明的是，在一些情况下，也可以不执行上述判断步骤如S802。例如，第二设备可以通过其他方式获知重传次数计数器的计数结果小于盲重传阈值(或者是盲重传阈值加1)，或者是获知重传次数计数器的计数结果大于或等于盲重传阈值(或者是盲重传阈值加1)。基于此，第二设备监听到第一响应时，当重传次数计数器的计数结果小于盲重传阈值(或者是盲重传阈值加1)，则更新重传次数计数器的计数结果，当重传次数计数器的计数结果大于或等于盲重传阈值(或者是盲重传阈值加1)，则确定第一响应接收成功。又例如，第一信息并未指示盲重传阈值的情况下，第二设备可以在监听到第一响应，更新重传次数计数器的计数结果。
图8所示实施例描述了重传次数计数器的计数逻辑，图8所示实施例可以单独实施，用于对MSG3的盲重传过程中重传次数进行计数，也可以与其他实施例结合。例如，图8所示实施例可以与图5所示实施例结合，或者是图5、图6所示实施例结合，或者是图5、图6、图7所示实施例结合，在一些实现方式中，图8所示实施例也可以和后续的实施例结合。
参见图9所示的另一种随机接入方法的后处理流程示意图，具体包括如下步骤：
S902、当定时器超时，确定重传次数计数器的计数结果是否小于盲重传阈值(或者是盲重传阈值加1)，或者接收到与随机接入使用前导码对应的响应次数。若是，则执行S904。若否，则执行S910。
S904、更新前导码传输计数器的计数结果。
S906、前导码传输计数器的计数结果是否小于或等于前导码的最大发送次数。若是，执行S908；若否，则执行S910。
S908、重新选择随机接入资源。
S910、结束随机接入流程。
上述S902至S910可以由第二设备执行。第二设备可以是终端。具体地，在定时器超 时的情况下，第二设备可以确定是否接收到N次响应(与发送的前导码或前导码标识RAPID对应的响应)，其中，N可以等于第五子信息、第六子信息或第七子信息指示的盲重传阈值。其中，针对四步随机接入，第二设备可以在第一定时器超时的情况下，确定是否接收到N1次RAR，N1可以等于第五子信息或第六子信息指示的盲重传阈值，也即N1等于第一阈值。针对两步随机接入，第二设备可以在第二定时器超时的情况下，确定是否接收到N2次fallback RAR，N2可以等于第五子信息或第七子信息指示的盲重传阈值，也即N2等于第二阈值。第二设备可以通过读取重传次数计数器的计数结果，例如是读取第一重传次数计数器的计数结果，或者是读取第二重传次数计数器的计数结果，确定是否接收到N次响应。第二设备也可以对接收到与随机接入使用前导码对应的响应次数进行统计，确定是否接收到N次响应。
在一些可能的实现方式中，也可以不执行上述判断步骤如S902，第二设备可以通过其他方式获知重传次数计数器的计数结果小于盲重传阈值(或者是盲重传阈值加1)，或者获知重传次数计数器的计数结果大于或等于盲重传阈值(或者是盲重传阈值加1)。当重传次数计数器的计数结果小于盲重传阈值(或者是盲重传阈值加1)，或者接收到与随机接入使用前导码对应的响应次数小于N，则表示响应接收不成功，第二设备可以更新随机接入前导码传输计数器(也称作前导码传输计数器)的计数结果，例如可以将前导码传输计数器加1。当前导码传输计数器的计数结果大于前导码的最大发送次数，例如前导码传输计数器的计数结果为前导码的最大发送次数加1，则表示随机接入未成功完成，可以结束随机接入流程。当前导码传输计数器的计数结果不大于前导码的最大发送次数，则表示随机接入未结束，第二设备可以再次进行随机接入尝试，例如可以重新选择随机接入资源，以继续发送前导码。
在一些可能的实现方式中，第二设备还可以在定时器超时的情况下，停止监听第一响应。例如，第二设备可以在定时器超时的情况下，停止定时器，从而停止监听第一响应。
在四步随机接入场景中，第二设备可以在第一定时器超时的情况下，停止第一定时器，从而停止监听RAR。如果第一定时器超时的情况下并没有接收到N次(第一阈值的值)RAR，则认为这次RAR接收并没有成功，第二设备可以将前导码传输计数器加1。当前导码传输计数器的计数结果大于前导码的最大发送次数，例如为最大发送次数加1，则表示随机接入没有成功完成，可以结束随机接入流程。当前导码传输计数器的计数结果小于或等于前导码的最大发送次数，则表示随机接入没有结束，第二设备可以返回随机接入资源选择，继续发送前导码。
在两步随机接入场景中，第二设备可以在第二定时器超时的情况下，停止第二定时器，从而停止监听fallback RAR。如果第二定时器超时的情况下并没有接收到N次(第二阈值的值)fallback RAR，则认为这次fallback RAR接收并没有成功，第二设备可以将前导码传输计数器加1。当前导码传输计数器的计数结果大于前导码的最大发送次数，例如为最大发送次数加1，则表示随机接入没有成功完成，可以结束随机接入流程。当前导码传输计数器的计数结果小于或等于前导码的最大发送次数，则表示随机接入没有结束，第二设备可以返回随机接入资源选择，继续发送前导码。
图9所示实施例描述了定时器超时情况下的处理逻辑，图9所示实施例可以单独实施，， 也可以与其他实施例结合。例如，图9所示实施例可以与图6所示实施例结合，或者是图图5、图6、图7所示实施例结合，或者是图5、图6、图7、图8所示实施例结合，在一些实现方式中，图9所示实施例也可以和后续的实施例结合。
上述实施例从终端侧对随机接入方法进行了介绍，下面将从网络侧对随机接入方法进行说明。
参见图10所示的一种随机接入方法的流程图，该方法包括：
S1002、获取RSRP。当RSRP小于目标功率，执行S1004。
S1004、指示第一信息。
上述S1002、S1004可以由第一设备执行。第一设备可以是网络设备，包括但不限于基站。其中，目标功率为参考信号接收功率RSRP的门限值，可以是第一设备配置。RSRP可以是第二设备自身的RSRP，也可以是第二设备所在小区内各设备的RSRP的平均值。其中，第二设备可以是终端。第二设备可以在测量到自身的RSRP后上报至第一设备。如此，第一设备可以获得第二设备的RSRP。进一步地，第一设备还可以获得第二设备所在小区内其他设备上报的RSRP，第一设备可以确定小区内各设备的RSRP的平均值。第一设备可以比较第二设备上报的RSRP与目标功率，或者是比较RSRP的平均值与目标功率。当RSRP(第二设备的RSRP或者第二设备所在小区内各设备的RSRP的平均值)小于目标功率，则表示网络信道环境较差，第一设备获知需要进行随机接入中MSG3的盲重传，可以执行S1004，以指示进行MSG3的盲重传。
在一些可能的实现方式中，第一信息也可以是第二设备上报。具体地，第一设备可以接收第二设备发送的MSG1，根据接收功率确定第二设备测量的RSRP，基于该RSRP可以获知第一信息，从而指示第一信息。
其中，第一信息可以包括以下至少一项子信息：第一子信息、第二子信息、第三子信息、第四子信息、第五子信息、第六子信息和第七子信息。子信息的相关内容描述可以参见上文相关内容描述，在此不再赘述。
第一设备在指示第一信息时，可以通过系统消息指示第一信息，通过信息元素IE指示第一信息，或者是通过MAC CE指示第一信息。其中，IE用于配置四步随机接入过程参数或两步随机接入过程参数，MAC CE包括RAR和/或fallback RAR。
为了便于理解，下面以在RAR或fallback RAR中携带相应的子信息，从而指示第一信息进行示例说明。
具体地，初始RAR(也称第二RAR)可以包括第一子信息、第二子信息、第三子信息、第四子信息中的至少一项，和/或第五子信息、第六子信息、第七子信息中的至少一项。在一个示例中，如图11A所示，初始RAR可以包括第一子信息，第一子信息可以用字符P表示，占用1个bit位。在另一个示例中，如图11B所示，初始RAR可以包括第五子信息，第五子信息可以用字符N表示，占用8个bit位。进一步地，初始RAR中还可以包括空余bit位，记作R。在其他示例中，如图11C所示，初始RAR可以包括第一子信息和第五子信息，与图11B中初始RAR相比，图11C中初始RAR包括表示第一子信息的比特位“P”， 但不包括上述空余比特位“R”。
后续RAR(也称作第一RAR)可以包括第一子信息、第二子信息、第三子信息、第四子信息中的至少一项，第五子信息、第六子信息、第七子信息中的至少一项，和/或空余比特位中的中至少一项。在一些可能的实现方式中，后续RAR的格式可以与初始RAR的格式相同，如此可以减少RAR复杂度。在另一些可能的实现方式中，后续RAR的格式可以与初始RAR的格式不同，如此可以通过格式识别初始RAR、后续RAR。
在一些示例中，当初始RAR为图11A所示的格式，后续RAR可以是图12A所示的格式。与图11A的初始RAR相比，图12A的后续RAR包括空余比特位“R”，不包括表示第一子信息的比特位“P”。在另一些示例中，当初始RAR为图11B或图11C所示的格式时，后续RAR可以是图12B或图12C的格式。与图11B的初始RAR相比，图11B的后续RAR包括表示第一子信息的比特位“P”，不包括空余比特位“R”以及表示第五子信息的“N”，图12B的后续RAR不包括表示第五子信息的“N”。与图11C的初始RAR相比，图12B的后续RAR不包括表示第五子信息的“N”，图12C的后续RAR不包括表示第一子信息的比特位“P”和表示第五子信息的“N”，包括空余比特位“R”。
需要说明的是，上述S1002为本申请实施例的可选步骤，执行本申请实施例的随机接入方法也可以不执行上述S1002。例如，第一设备可以配置第一信息，从而指示第一信息。
图10所示实施例可以单独实施，也可以与其他实施例结合，例如是与终端侧实施例结合。本申请对此不作限制。
为了使得本申请的技术方案更加清楚、易于理解，下面结合四步随机接入、两步随机接入场景对本申请的随机接入方法进行详细说明。
首先，参见图13A所示的一种四步随机接入场景中随机接入方法的流程图，该方法包括如下步骤：
S1302、终端选择随机接入资源。
随机接入资源是指进行随机接入所使用的资源，包括但不限于前导码资源、随机接入时机(random access occasion，RO)资源。其中，RO资源是指能够传输前导码的时频资源(时域资源、频域资源，也称作时域RO、频域RO)。
终端可以根据网络侧配置的随机接入资源池，从随机接入资源池中选择目标资源，以进行随机接入。其中，目标资源可以是随机接入资源池中的空闲资源，如码资源池中空闲的前导码，或者是RO资源池中空闲的RO资源。
S1304、终端选择四步随机接入，发送MSG1。
具体地，终端可以在RSRP小于目标功率时，选择四步随机接入。在一些示例中，终端刚接入小区，RSRP大于目标功率，表征性能良好，终端可以选择使用两步随机接入，使用过程中性能(例如RSRP)下降，终端可以选择从两步随机接入回退到四步随机接入。在另一些示例中，终端刚接入小区，RSRP小于或等于目标功率，表征性能较差，终端可以选择使用四步随机接入。
MSG1中可以携带前导码标识RAPID，以指示本次随机接入使用的前导码。在一些示例中，MSG1也可以携带本次随机接入使用的前导码。终端可以向基站发送上述携带有 RAPID或前导码的MSG1。
S1305、基站指示第一信息。
具体地，基站可以获取终端上报的RSRP，例如终端可以在MSG1中携带终端测量的RSRP。当RSRP小于目标功率，基站可以指示第一信息。其中，基站可以通过系统消息、IE或MAC CE中的至少一项指示第一信息。例如，基站可以通过MAC CE(例如是RAR)指示第一信息。
S1306、终端开启RAR窗口以监听RAR。当监听到初始RAR，执行S1308。
MSG1中可以携带前导码标识RAPID，以指示本次随机接入使用的前导码。相应地，初始RAR可以为本次随机接入过程中监听到的与MSG1中RAPID对应的第一个RAR。在一些示例中，初始RAR也可以为本次随机接入过程中监听到的与MSG1中前导码对应的第一个RAR。
S1308、终端确定初始RAR是否为仅包括RAPID的MAC数据包，若否，执行S1310，若是，则执行S1328。
终端可以解析初始RAR，从而确定初始RAR是否为仅包括RAPID的MAC数据包。其中，初始RAR为仅包括RAPID的MAC数据包，表示随机接入完成，可以执行S1328以结束随机接入流程。初始RAR不是仅包括RAPID的MAC数据包，例如初始RAR还包括TA、为传输MSG3分配的PUSCH调度信息UL_Grant(包括是否跳频、调制编码率、接入资源和接入时刻等内容)，则表示随机接入未结束，可以执行S1310。
S1310、终端确定随机接入是否为基于竞争的随机接入，若是，则执行S1312，若否，则执行S1328。
具体地，终端可以通过随机接入使用的前导码是否为基于竞争的前导码，例如是否为竞争的码资源池中的前导码，从而确定随机接入是否为基于竞争的随机接入。
上述S1308、S1310为按照设定顺序先后执行，在本申请实施例其他可能的实现方式中，也可以按照其他顺序先后执行，或者是并行执行，本实施例对此不作限定。在一些可能的实现方式中，终端也可以不执行上述S1308或S1310，例如可以在后续流程中确定随机接入是否完成。
S1312、终端确定是否获取到第一信息。若是，则执行S1314。
终端可以从初始RAR获取第一信息，从系统消息中获取第一信息，或者从IE中获取第一信息。当终端获取到第一信息，可以获知需要进行随机接入中MSG3的盲重传。在一些可能的实现方式中，第一信息中包括第一子信息、第二子信息、第三子信息、第四子信息中的至少一项，或者包括第五子信息、第六子信息、第七子信息中的至少一项，即指示进行MSG3的盲重传，则终端可以在获取到第一信息时，获知需要进行MSG3的盲重传，因此，终端可以执行S1314，从而执行MSG3的盲重传。在另一些可能的实现方式中，第一子信息、第二子信息、第三子信息和第四子信息通过不同取值指示是否进行MSG3的盲重传，则终端可以在获取到第一信息，第一信息包括第一子信息、第二子信息、第三子信息和第四子信息中的至少一项，且第一子信息、第二子信息、第三子信息和第四子信息中的至少一项指示为是时，获知需要进行MSG3的盲重传，因此，终端可以执行S1314，从而执行MSG3的盲重传。
S1314、终端开启第一定时器，在第一定时器运行过程中监听后续RAR。当监听到后续RAR，执行S1316。
后续RAR可以为本次随机接入过程与MSG1中RAPID对应的RAR中除了初始RAR之外的RAR，例如是与RAPID对应的第二个RAR、第三个RAR……第N个RAR。后续RAR也可以为本次随机接入过程与MSG1中前导码对应的RAR中除了初始RAR之外的RAR。
如图13B所示，当终端在RAR窗口监听到初始RAR，即接收到与前导码对应的第一个RAR，可以开启第一定时器，例如是图13B中的新timer，以监听后续RAR。
上述S1314为终端监听后续RAR的一种具体实现，在本申请实施例其他可能的实现方式中，也可以通过其他方式监听后续RAR，例如终端也可以开启新的窗口，以监听后续RAR。
S1316、终端确定第一重传次数计数器的计数结果是否大于或等于第一阈值。若是，则执行S1317。若否，则执行S1318，
上述S1316为本申请实施例的可选步骤，执行本申请实施例的随机接入方法也可以不执行S1316。例如，第一信息中不包括第五子信息、第六子信息，或者未指示四步随机接入的盲重传阈值，则可以不执行S1316。
S1317、终端确定RAR接收成功。
在一些可能的实现方式中，在RAR接收成功的情况下，还可以执行S1320。
S1318、终端更新第一重传次数计数器的计数结果。
具体地，终端可以每接收一个后续RAR(非初始RAR)，在确定第一重传次数计数器的计数结果小于第一阈值时，将第一重传次数计数器加1。其中，该示例是以第一重传次数计数器的初始值为0示例说明，当第一重传次数计数器的初始值为1，也可以在确定第一重传次数计数器的小于更新后的第一阈值(例如是第一阈值加1)时，将第一重传次数计数器加1。
S1319、终端确定第一定时器是否超时，若是，则执行S1320、S1322。
上述第一定时器设置的超时时间足够长时，也可以不需执行S1319。相应地，终端也可以不执行上述S1322、S1324。
S1320、终端停止监听后续RAR。
具体地，终端可以停止第一定时器，从而停止监听后续RAR。如图13B所示，当新timer超时，终端可以停止新timer，从而停止监听后续RAR。
S1322、终端确定第一重传次数计数器的计数结果是否小于第一阈值，或者确定接收到与发送的MSG1中RAPID对应的RAR次数是否小于第一阈值。若是，则执行S1324，若否，则执行S1328。
S1324、终端将前导码传输计数器加1。
S1326、终端确定前导码传输计数器的计数结果是否大于前导码的最大发送次数。若否，则返回S1302；若是，则执行S1328。
当前导码传输计数器的计数结果大于前导码的最大发送次数，例如是等于最大发送次数加1，则表示随机接入过程没有成功完成，可以执行S1328，以结束随机接入流程。当前 导码传输计数器的计数结果小于或等于前导码的最大发送次数，则表示随机接入过程未结束，可以返回S1302以继续发送前导码。
S1328、终端结束随机接入流程。
仍以图13B示例说明，在新timer超时的情况下如果没有收到最后一个RAR说明此时的信道环境较差，很可能接收不到MSG4，因此可以进行下一次随机接入或者下一个随机接入尝试。
接下来，参见图14A所示的一种两步随机接入场景中随机接入方法的流程图，该方法包括如下步骤：
S1402、终端选择随机接入资源。
随机接入资源是指进行随机接入所使用的资源，包括但不限于前导码资源、随机接入时机RO资源、PUSCH资源。终端可以根据网络侧配置的随机接入资源池，从随机接入资源池中选择目标资源，以进行随机接入。其中，目标资源可以是随机接入资源池中的空闲资源，如码资源池中空闲的前导码，或者是RO资源池中空闲的RO资源、PUSCH资源池中的空闲PUSCH。
S1404、终端选择两步随机接入，发送MSGA。
具体地，终端获取RSRP，当RSRP大于目标功率时，表征性能良好，终端可以选择使用两步随机接入，以减少交互次数，进而减少功耗。
MSGA中可以携带前导码标识RAPID，以指示本次随机接入使用的前导码。在一些示例中，MSGA也可以携带本次随机接入使用的前导码。此外，MSGA中还包括PUSCH payload。然后终端可以向基站发送上述携带有前导码(或RAPID)与PUSCH payload的MSGA。
S1405、基站指示第一信息。
具体地，基站可以获取终端上报的RSRP，例如终端可以在MSG1中携带终端测量的RSRP。当RSRP小于目标功率，基站可以指示第一信息。其中，基站可以通过系统消息、IE或MAC CE中的至少一项指示第一信息。例如，基站可以通过MAC CE(例如是fallback RAR)指示第一信息。
S1406、终端开启MSGB response窗口以监听用MSGB-RNTI加扰的RAR。当监听到初始RAR，执行S1408。
在两步随机接入场景中，随机接入响应窗口也称作MSGB response窗口，用于监听用MSGB-RNTI加扰的RAR。其中，用MSGB-RNTI加扰的RAR可以包括fallback RAR。初始RAR可以为与发送的前导码或RAPID对应的第一个fallback RAR，也称作初始fallback RAR。终端可以在监听到fallback RAR时，识别该fallback RAR是否为与发送的前导码或RAPID对应的第一个fallback RAR，若是，则表示监听到初始RAR。
S1408、终端确定随机接入是否为基于竞争的随机接入，若是，则执行S1410，若否，则执行S1426。
具体地，终端可以通过随机接入使用的前导码是否为基于竞争的前导码，例如是否为竞争的码资源池中的前导码，从而确定随机接入是否为基于竞争的随机接入。
上述S1408为本申请实施例的可选步骤，执行本申请实施例的随机接入方法也可以不执行上述步骤。
S1410、终端确定是否获取到第一信息。若是，则执行S1412。
终端可以从MAC CE(如初始fallback RAR)获取第一信息，从系统消息中获取第一信息，或者从IE中获取第一信息。当终端获取到第一信息，可以获知需要进行随机接入中MSG3的盲重传。在一些可能的实现方式中，第一信息中包括第一子信息、第二子信息、第三子信息、第四子信息中的至少一项，或者包括第五子信息、第六子信息、第七子信息中的至少一项，即指示进行MSG3的盲重传，则终端可以在获取到第一信息时，获知需要进行MSG3的盲重传，因此，终端可以执行S1412，从而执行MSG3的盲重传。在另一些可能的实现方式中，第一子信息、第二子信息、第三子信息和第四子信息通过不同取值指示是否进行MSG3的盲重传，则终端可以在获取到第一信息，第一信息包括第一子信息、第二子信息、第三子信息和第四子信息中的至少一项，且第一子信息、第二子信息、第三子信息和第四子信息中的至少一项指示为是时，获知需要进行MSG3的盲重传，因此，终端可以执行S1412，从而执行MSG3的盲重传。
S1412、终端开启第二定时器，在第二定时器运行过程中监听后续RAR。当监听到后续RAR，执行S1414。
后续RAR可以为本次随机接入过程与MSG1携带RAPID对应的RAR中除了初始fallback RAR之外的fallback RAR，例如是与RAPID对应的第二个fallback RAR、第三个fallback RAR……第N个fallback RAR。后续RAR也可以为本次随机接入过程与MSG1携带前导码对应的fallback RAR中除了初始fallback RAR之外的fallback RAR。
以图14B示例说明，当终端在系统消息中接收到第一信息，第一信息指示在MSGB包括fallback RAR的两步随机接入应用MSG3的盲重传，则在执行两步随机接入的情况下，接收到fallback RAR之后，停止MSGB response window的情况下，开启第二定时器，即图14B中的新timer。
上述S1412为终端监听后续RAR的一种具体实现，在本申请实施例其他可能的实现方式中，也可以通过其他方式监听后续RAR，例如终端也可以开启新的窗口，以监听后续RAR。
S1414、终端确定第二重传次数计数器的计数结果是否大于或等于第二阈值。若是，则执行S1415；若否，则执行S1416。
上述S1414为本申请实施例的可选步骤，执行本申请实施例的随机接入方法也可以不执行S1414。例如，第一信息中不包括第五子信息、第七子信息，或者未指示两步随机接入的盲重传阈值，则可以不执行S1414。
S1415、终端确定fallback RAR接收成功。
在一些可能的实现方式中，在fallback RAR接收成功的情况下，终端还可以执行S1418。
S1416、终端更新第二重传次数计数器的计数结果。
具体地，终端可以每接收一个后续RAR(例如为后续fallback RAR)，在确定第二重传次数计数器的计数结果小于第二阈值时，将第二重传次数计数器加1。其中，该示例是以第二重传次数计数器的初始值为0示例说明，当第二重传次数计数器的初始值为1，也 可以在确定第二重传次数计数器的小于更新后的第二阈值(例如是第二阈值加1)时，将第二重传次数计数器加1。
S1417、终端确定第二定时器是否超时，若是，则执行S1418、S1420。
上述第二定时器设置的超时时间足够长时，也可以不需执行S1417。相应地，终端也可以不执行上述S1420、S1422。
S1418、终端停止监听后续RAR。
具体地，终端可以停止第二定时器，从而停止监听后续fallback RAR。仍以图14B示例说明，当终端在新timer接收到最后一个fallback RAR，则可以停止该新timer，以停止监听后续fallback RAR。
S1420、终端确定第二重传次数计数器的计数结果是否小于第二阈值，或者确定接收到与发送的MSGA中RAPID对应的fallback RAR次数是否小于第二阈值。若是，则执行S1422，若否，则执行S1426。
S1422、终端将前导码传输计数器加1。
S1424、终端确定前导码传输计数器的计数结果是否大于前导码的最大发送次数。若否，则返回S1402。若是，则执行S1426。
当前导码传输计数器的计数结果大于前导码的最大发送次数，例如是等于最大发送次数加1，则表示随机接入过程没有成功完成，可以执行S1426，以结束随机接入流程。当前导码传输计数器的计数结果小于或等于前导码的最大发送次数，则表示随机接入过程未结束，可以返回S1402以继续发送前导码。
S1426、终端结束随机接入流程。
需要说明的是，上述实施例仅仅是本申请提供的一些示意性的实施方式，并不表示本申请仅提供上述方式，在实际应用时，还可以对上述实施例的步骤进行拆分或组合，本申请对此不作限制。
图15为本申请实施例提供的一种电子设备的组成示例。该电子设备可以是第一设备，包括但不限于基站、核心网单元。图15示出了一种简化的基站结构示意图。基站包括1510部分、1520部分以及1530部分。1510部分主要用于基带处理，对基站进行控制等；1510部分通常是基站的控制中心，通常可以称为处理器，用于控制基站执行上述方法实施例中第一设备侧的处理操作。1520部分主要用于存储计算机程序代码和数据。1530部分主要用于射频信号的收发以及射频信号与基带信号的转换；1530部分通常可以称为收发模块、收发机、收发电路、或者收发器等。1530部分的收发模块，也可以称为收发机或收发器等，其包括天线1533和射频电路(图中未示出)，其中射频电路主要用于进行射频处理。可选地，可以将1530部分中用于实现接收功能的器件视为接收机，将用于实现发送功能的器件视为发射机，即1530部分包括接收机1532和发射机1531。接收机也可以称为接收模块、接收器、或接收电路等，发送机可以称为发射模块、发射器或者发射电路等。
1510部分与1520部分可以包括一个或多个单板，每个单板可以包括一个或多个处理器和一个或多个存储器。处理器用于读取和执行存储器中的程序以实现基带处理功能以及对基站的控制。若存在多个单板，各个单板之间可以互联以增强处理能力。作为一种可选 的实施方式，也可以是多个单板共用一个或多个处理器，或者是多个单板共用一个或多个存储器，或者是多个单板同时共用一个或多个处理器。
例如，在一种实现方式中，1530部分的收发模块用于执行前述方法实施例中由基站(第一设备)执行的收发相关的过程。1510部分的处理器用于执行前述方法实施例中由基站执行的处理相关的过程。
应理解，图15仅为示例而非限定，上述包括处理器、存储器以及收发器的网络设备可以不依赖于图15所示的结构。
图16为本申请实施例提供的另一种电子设备的组成示例。该电子设备可以是第二设备，第二设备可以为终端，包括但不限于手机、智能穿戴设备(如智能手表)等电子设备。下面以手机为例，电子设备可以包括处理器310，外部存储器接口320，内部存储器321，显示屏330，摄像头340，天线1，天线2，移动通信模块350，以及无线通信模块360等。
可以理解的是，本实施例示意的结构并不构成对该电子设备的具体限定。在另一些实施例中，该电子设备可以包括比图示更多或更少的部件，或者组合某些部件，或者拆分某些部件，或者不同的部件布置。图示的部件可以以硬件，软件或软件和硬件的组合实现。
处理器310可以包括一个或多个处理单元，例如：处理器310可以包括应用处理器(application processor，AP)，调制解调处理器，图形处理器(graphics processing unit，GPU)，图像信号处理器(image signal processor，ISP)，控制器，视频编解码器，数字信号处理器(digital signal processor，DSP)，基带处理器，和/或神经网络处理器(neural-network processing unit，NPU)等。其中，不同的处理单元可以是独立的器件，也可以集成在一个或多个处理器中。
可以理解的是，本实施例示意的各模块间的接口连接关系，只是示意性说明，并不构成对电子设备的结构限定。在本申请另一些实施例中，电子设备也可以采用上述实施例中不同的接口连接方式，或多种接口连接方式的组合。
外部存储器接口320可以用于连接外部存储卡，例如Micro SD卡，实现扩展电子设备的存储能力。外部存储卡通过外部存储器接口320与处理器310通信，实现数据存储功能。例如将音乐，视频等文件保存在外部存储卡中。
内部存储器321可以用于存储计算机可执行程序代码，可执行程序代码包括指令。处理器310通过运行存储在内部存储器321的指令，从而执行电子设备的各种功能应用以及数据处理。内部存储器321可以包括存储程序区和存储数据区。其中，存储程序区可存储操作系统，至少一个功能所需的应用程序(比如声音播放功能，图像播放功能等)等。存储数据区可存储电子设备使用过程中所创建的数据(比如音频数据，电话本等)等。此外，内部存储器321可以包括高速随机存取存储器，还可以包括非易失性存储器，例如至少一个磁盘存储器件，闪存器件，通用闪存存储器(universal flash storage，UFS)等。处理器310通过运行存储在内部存储器321的指令，和/或存储在设置于处理器中的存储器的指令，执行电子设备的各种功能应用以及数据处理。
电子设备的无线通信功能可以通过天线1，天线2，移动通信模块350，无线通信模块360，调制解调处理器以及基带处理器等实现。
天线1和天线2用于发射和接收电磁波信号。电子设备中的每个天线可用于覆盖单个或多个通信频带。不同的天线还可以复用，以提高天线的利用率。例如：可以将天线1复用为无线局域网的分集天线。在另外一些实施例中，天线可以和调谐开关结合使用。
移动通信模块350可以提供应用在电子设备上的包括2G/3G/4G/5G等无线通信的解决方案。移动通信模块350可以包括至少一个滤波器，开关，功率放大器，低噪声放大器(low noise amplifier，LNA)等。移动通信模块350可以由天线1接收电磁波，并对接收的电磁波进行滤波，放大等处理，传送至调制解调处理器进行解调。移动通信模块350还可以对经调制解调处理器调制后的信号放大，经天线1转为电磁波辐射出去。在一些实施例中，移动通信模块350的至少部分功能模块可以被设置于处理器310中。在一些实施例中，移动通信模块350的至少部分功能模块可以与处理器310的至少部分模块被设置在同一个器件中。
一些实施例中，电子设备通过移动通信模块350和天线1发起或接收的呼叫请求。
另外，在上述部件之上，运行有操作系统。例如iOS操作系统，Android操作系统，Windows操作系统等。在操作系统上可以安装运行应用程序。所属领域的技术人员可以清楚地了解到，为描述方便和简洁，上述提供的任一种电子设备中相关内容的解释及有益效果均可参考上文提供的对应的方法实施例，此处不再赘述。
本申请还提供一种通信系统，该通信系统可以包括如图15所示的第一设备(例如是基站等网络设备)和如图16所示的第二设备(例如是手机等终端)。
本申请中，终端或网络设备可以包括硬件层、运行在硬件层之上的操作系统层，以及运行在操作系统层上的应用层。其中，硬件层可以包括中央处理器(central processing unit，CPU)、内存管理模块(memory management unit，MMU)和内存(也称为主存)等硬件。操作系统层的操作系统可以是任意一种或多种通过进程(process)实现业务处理的计算机操作系统，例如，Linux操作系统、Unix操作系统、Android操作系统、iOS操作系统或windows操作系统等。应用层可以包含浏览器、通讯录、文字处理软件、即时通信软件等应用。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统，设备和模块的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，设备和方法，可以通过其它的方式实现。例如，以上所描述的设备实施例仅仅是示意性的，例如，所述模块的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个模块或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，设备或模块的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的模块可以是或者也可以不是物理上分开的，作为模块显示的部件可以是或者也可以不是物理模块，即可以位于一个地方，或者也可以分布到多个网络模块上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能模块可以集成在一个处理模块中，也可以是各个模块单独物理存在，也可以两个或两个以上模块集成在一个模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。
所述集成的模块如果以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分过程。而前述的存储介质包括：U盘、移动硬盘、只读存储器、随机存取存储器、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案范围。

Claims (32)

  1. 一种随机接入方法，其特征在于，所述方法包括：
    指示第一信息，所述第一信息对应于随机接入中第三消息的盲重传信息；
    所述第一信息包括以下至少一项子信息：
    第一子信息，用于指示是否进行随机接入中第三消息的盲重传；
    第二子信息，用于指示是否进行四步随机接入中第三消息的盲重传；
    第三子信息，用于指示是否进行两步随机接入中第三消息的盲重传；
    第四子信息，用于指示是否进行四步随机接入中的第三消息的盲重传以及是否进行两步随机接入中第三消息的盲重传；
    第五子信息，用于指示随机接入中第三消息的盲重传阈值；
    第六子信息，用于指示四步随机接入中第三消息的盲重传阈值；
    第七子信息，用于指示两步随机接入中第三消息的盲重传阈值。
  2. 根据权利要求1所述的方法，其特征在于，所述指示第一信息，包括：
    通过系统消息指示所述第一信息；或者，
    通过信息元素IE指示所述第一信息，所述IE用于配置四步随机接入过程参数或两步随机接入过程参数；或者，
    通过介质访问控制层控制元素MAC CE指示所述第一信息。
  3. 一种随机接入方法，其特征在于，所述方法包括：
    获取第一信息，所述第一信息对应于随机接入中第三消息的盲重传信息；
    所述第一信息包括以下至少一项子信息：
    第一子信息，用于指示是否进行随机接入中第三消息的盲重传；
    第二子信息，用于指示是否进行四步随机接入中第三消息的盲重传；
    第三子信息，用于指示是否进行两步随机接入中第三消息的盲重传；
    第四子信息，用于指示是否进行四步随机接入中的第三消息的盲重传以及是否进行两步随机接入中第三消息的盲重传；
    第五子信息，用于指示随机接入中第三消息的盲重传阈值；
    第六子信息，用于指示四步随机接入中第三消息的盲重传阈值；
    第七子信息，用于指示两步随机接入中第三消息的盲重传阈值。
  4. 根据权利要求3所述的方法，其特征在于，所述获取第一信息，包括：
    获取系统消息，所述系统消息指示所述第一信息；或者，
    获取信息元素IE，所述IE用于配置四步随机接入过程参数或两步随机接入过程参数，所述IE指示所述第一信息；或者，
    获取介质访问控制层控制元素MAC CE，所述MAC CE指示所述第一信息。
  5. 根据权利要求3或4所述的方法，其特征在于，所述方法还包括：
    当所述第一信息包括所述第一子信息、所述第二子信息、所述第三子信息和所述第四子信息中的至少一项，且所述第一子信息、所述第二子信息、所述第三子信息和所述第四子信息中的至少一项的指示为是，监听第一响应；或者，
    当获取到所述第一信息，监听第一响应。
  6. 根据权利要求5所述的方法，其特征在于，所述监听第一响应，包括：
    开启定时器，在所述定时器运行过程中监听第一响应。
  7. 根据权利要求5或6所述的方法，其特征在于，所述监听第一响应，包括：
    针对四步随机接入，开启第一定时器，在所述第一定时器运行过程中监听第一响应；或者，
    针对两步随机接入，开启第二定时器，在所述第二定时器运行过程中监听第一响应。
  8. 根据权利要求5至7任一项所述的方法，其特征在于，所述第一信息包括所述第五子信息、所述第六子信息和所述第七子信息中的至少一项，监听到第一响应，所述方法还包括：
    当重传次数计数器的计数结果小于所述盲重传阈值，则更新所述计数结果；或者，
    当重传次数计数器的计数结果大于或等于所述盲重传阈值，则确定第一响应接收成功。
  9. 根据权利要求8所述的方法，其特征在于，所述重传次数计数器包括应用于四步随机接入的第一重传次数计数器，所述方法包括：
    当所述第一重传次数计数器的计数结果小于所述盲重传阈值，则更新所述第一重传次数计数器的计数结果；或者
    当所述第一重传次数计数器的计数结果大于或等于所述盲重传阈值，则确定第一响应接收成功。
  10. 根据权利要求8所述的方法，其特征在于，所述重传次数计数器包括应用于两步随机接入的第二重传次数计数器，所述方法包括：
    当所述第二重传次数计数器的计数结果小于所述盲重传阈值，则更新所述第二重传次数计数器的计数结果；或者，
    当所述第二重传次数计数器的计数结果大于或等于所述盲重传阈值，则确定第一响应接收成功。
  11. 根据权利要求5至10任一项所述的方法，其特征在于，所述方法还包括：
    当定时器超时，停止监听第一响应。
  12. 根据权利要求5至11任一项所述的方法，其特征在于，当定时器超时，所述方法还包括：
    当重传次数计数器的计数结果小于盲重传阈值，或接收到与随机接入使用前导码对应的响应次数小于盲重传阈值，更新前导码传输计数器的计数结果，并在所述前导码传输计数器的计数结果小于或等于所述前导码的最大发送次数时，重新选择随机接入资源；或者，
    当重传次数计数器的计数结果大于或等于盲重传阈值，结束随机接入流程。
  13. 根据权利要求3至12任一项所述的方法，其特征在于，所述方法还包括：
    在随机接入响应窗口监听到第二响应，确定所述第二响应是否为仅包括前导码标识RAPID的介质访问控制MAC数据包，若否，则确定是否获取到所述第一信息。
  14. 根据权利要求3至13任一项所述的方法，其特征在于，所述方法还包括：
    确定所述随机接入是否为基于竞争的随机接入，若是，则确定是否获取到所述第一信息。
  15. 根据权利要求5至12任一项所述的方法，其特征在于，所述第一响应包括第一子 信息、第二子信息、第三子信息、第四子信息中的至少一项，和/或第五子信息、第六子信息、第七子信息中的至少一项。
  16. 根据权利要求13所述的方法，其特征在于，所述第二响应包括第一子信息、第二子信息、第三子信息、第四子信息中的至少一项，第五子信息、第六子信息、第七子信息中的至少一项，和/或空余比特位中的中至少一项。
  17. 一种随机接入方法，其特征在于，所述方法包括：
    指示第一信息，所述第一信息对应于随机接入中第三消息的盲重传信息；
    所述第一信息包括以下至少一项子信息：
    第一子信息，用于指示是否进行随机接入中第三消息的盲重传；
    第二子信息，用于指示是否进行四步随机接入中第三消息的盲重传；
    第三子信息，用于指示是否进行两步随机接入中第三消息的盲重传；
    第四子信息，用于指示是否进行四步随机接入中的第三消息的盲重传以及是否进行两步随机接入中第三消息的盲重传；
    第五子信息，用于指示随机接入中第三消息的盲重传阈值；
    第六子信息，用于指示四步随机接入中第三消息的盲重传阈值；
    第七子信息，用于指示两步随机接入中第三消息的盲重传阈值；
    当所述第一信息包括所述第一子信息、所述第二子信息、所述第三子信息和所述第四子信息中的至少一项，且所述第一子信息、所述第二子信息、所述第三子信息和所述第四子信息中的至少一项的指示为是，监听第一响应；或者，当获取到所述第一信息，监听第一响应。
  18. 根据权利要求17所述的方法，其特征在于，所述指示第一信息，包括：
    通过系统消息指示所述第一信息；或者，
    通过信息元素IE指示所述第一信息，所述IE用于配置四步随机接入过程参数或两步随机接入过程参数；或者，
    通过介质访问控制层控制元素MAC CE指示所述第一信息。
  19. 根据权利要求17所述的方法，其特征在于，所述监听第一响应，包括：
    开启定时器，在所述定时器运行过程中监听第一响应。
  20. 根据权利要求17至19任一项所述的方法，其特征在于，所述监听第一响应，包括：
    针对四步随机接入，开启第一定时器，在所述第一定时器运行过程中监听第一响应；或，
    针对两步随机接入，开启第二定时器，在所述第二定时器运行过程中监听第一响应。
  21. 根据权利要求17至20任一项所述的方法，其特征在于，所述第一信息包括所述第五子信息、所述第六子信息和所述第七子信息中的至少一项，监听到第一响应，所述方法还包括：
    当重传次数计数器的计数结果小于所述盲重传阈值，则更新所述计数结果；或者，
    当重传次数计数器的计数结果大于或等于所述盲重传阈值，则确定第一响应接收成功。
  22. 根据权利要求21所述的方法，其特征在于，所述重传次数计数器包括应用于四步随机接入的第一重传次数计数器，所述方法包括：
    当所述第一重传次数计数器的计数结果小于所述盲重传阈值，则更新所述第一重传次数计数器的计数结果；或者，
    当所述第一重传次数计数器的计数结果大于或等于所述盲重传阈值，则确定第一响应接收成功。
  23. 根据权利要求21所述的方法，其特征在于，所述重传次数计数器包括应用于两步随机接入的第二重传次数计数器，所述方法包括：
    当所述第二重传次数计数器的计数结果小于所述盲重传阈值，则更新所述第二重传次数计数器的计数结果；或者，
    当所述第二重传次数计数器的计数结果大于或等于所述盲重传阈值，则确定第一响应接收成功。
  24. 根据权利要求17至23任一项所述的方法，其特征在于，所述方法还包括：
    当所述定时器超时，停止监听第一响应。
  25. 根据权利要求17至24任一项所述的方法，其特征在于，当所述定时器超时，所述方法还包括：
    当重传次数计数器的计数结果小于第一阈值，或接收到与随机接入使用前导码对应的响应次数小于第一阈值，更新前导码传输计数器的计数结果，并在所述前导码传输计数器的计数结果小于或等于所述前导码的最大发送次数时，重新选择随机接入资源；或者，
    当重传次数计数器的计数结果大于或等于第一阈值，结束随机接入流程。
  26. 根据权利要求17至25任一项所述的方法，其特征在于，所述方法还包括：
    在随机接入响应窗口监听到第二响应，确定所述第二响应是否为仅包括前导码标识RAPID的介质访问控制MAC数据包，若否，则确定是否获取到所述第一信息。
  27. 根据权利要求17至26任一项所述的方法，其特征在于，所述方法还包括：
    确定所述随机接入是否为基于竞争的随机接入，若是，则确定是否获取到所述第一信息。
  28. 根据权利要求17至27任一项所述的方法，其特征在于，所述第一响应包括第一子信息、第二子信息、第三子信息、第四子信息中的至少一项，和/或第五子信息、第六子信息、第七子信息中的至少一项。
  29. 根据权利要求26所述的方法，其特征在于，所述第二响应包括第一子信息、第二子信息、第三子信息、第四子信息中的至少一项，第五子信息、第六子信息、第七子信息中的至少一项，和/或空余比特位中的中至少一项。
  30. 一种电子设备，其特征在于，所述电子设备包括：
    存储器，用于存储计算机程序或计算机指令；
    处理器，用于执行所述存储器中存储的计算机程序或计算机指令，使得所述电子设备执行如权利要求1或2所述的方法，或者执行如权利要求3至16任一项所述的方法。
  31. 一种通信系统，其特征在于，所述系统包括第一设备和所述第二设备，所述第一设备和所述第二设备用于执行如权利要求17至29任一项所述的方法。
  32. 一种计算机存储介质，用于存储计算机程序，所述计算机程序被执行时，用于实现权利要求1至29任一项所述的方法。
PCT/CN2024/082147 2023-05-11 2024-03-18 一种随机接入方法及相关设备 Ceased WO2024230321A1 (zh)

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