WO2020164466A1 - 一种随机接入过程切换方法、装置、系统、终端和存储介质 - Google Patents

一种随机接入过程切换方法、装置、系统、终端和存储介质 Download PDF

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Publication number
WO2020164466A1
WO2020164466A1 PCT/CN2020/074698 CN2020074698W WO2020164466A1 WO 2020164466 A1 WO2020164466 A1 WO 2020164466A1 CN 2020074698 W CN2020074698 W CN 2020074698W WO 2020164466 A1 WO2020164466 A1 WO 2020164466A1
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Prior art keywords
information
random access
access process
terminal
base station
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PCT/CN2020/074698
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English (en)
French (fr)
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沈霞
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中国信息通信研究院
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Publication of WO2020164466A1 publication Critical patent/WO2020164466A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • 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
    • 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
    • H04L1/1607—Details of the supervisory signal
    • 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • This application relates to the field of communication technology, and in particular to a random access process switching method, device, system, terminal, and storage medium.
  • Msg1 is the terminal selecting the preamble sequence according to the rules set in the standard 38.321 or 36.321 for the base station to estimate the timing advance (TA);
  • Msg2 is the random access response of Msg1, which contains the preamble identifier, TA
  • the terminal sends the uplink authorization information of Msg3 to the base station, and the temporary cell radio network temporary identifier (TC-RNTI) Wait;
  • the terminal sends a message Msg3 to the base station.
  • the terminal reads the preamble sequence identifier corresponding to Msg1 in Msg2, it sends Msg3 again.
  • the content of Msg3 is related to the event that triggers the random access process;
  • the base station sends a message Msg4 to the terminal.
  • Msg4 is a response to resolve the contention conflict.
  • the Msg4 detected by the terminal contains the relevant identification information in the corresponding Msg3, it is regarded as a successful random access.
  • the terminal sends a message MsgA to the base station, and assumes the functions of Msg1 and Msg3 in the 4-step RACH. It is a preamble sequence + physical uplink shared channel (PUSCH) transmission structure.
  • the main function is to use the preamble sequence and demodulation reference signal (DMRS) performs channel and TA estimation.
  • DMRS demodulation reference signal
  • the media access control (MAC) protocol data unit (PDU) corresponding to MsgA under different RACH trigger events contains different contents.
  • the PUSCH resource corresponding to MsgA is configured by the base station without scheduling, the preamble sequence and The PUSCH directly has a certain mapping relationship, which reduces resource selection conflicts;
  • the second time the base station sends a message MsgB to the terminal, and assumes the functions of Msg2 and Msg4 in 4-step RACH, which are mainly used to indicate the TA of random access, TC-RNTI allocation, authorization of uplink data transmission, and contention conflict resolution.
  • the prior art does not provide a specific solution for switching to 4-step RACH when both the preamble sequence and PUSCH in the MsgA of the 2-step RACH fail to be detected.
  • the present application provides a random access process switching method, device, system, terminal, and storage medium to realize a complete random access process.
  • a random access process switching method applied to a terminal, and the method includes:
  • the first information is sent to the base station according to the first configuration information of the first random access procedure, so that the base station is based on the preset random access procedure.
  • the input configuration detects the first information, and determines whether to send the second information to the terminal according to the first result after the detection and the second configuration information of the first random access process;
  • the terminal When the terminal receives the second information, it detects the second information according to the first information, and according to the second result after the detection, determines whether to switch the first random access procedure to scheduling contention-based The second random access procedure is to initiate random access.
  • a random access process switching device applied to a terminal comprising:
  • the sending unit is configured to send the first information to the base station according to the first configuration information of the first random access process when the random access is initiated by the first random access process based on the scheduling-free, so that the base station according to the The preset random access configuration detects the first information, and determines whether to send the second information to the terminal according to the first result after the detection and the second configuration information of the first random access process;
  • a receiving unit configured to receive the second information from the base station
  • a processing unit configured to detect the second information according to the first information, and determine whether to switch the first random access process to a second random access process based on scheduling contention according to the second result after the detection To initiate random access.
  • a random access process switching device applied to a base station comprising:
  • the detection unit is configured to detect the first information sent by the terminal according to a preset random access configuration; wherein, when the terminal initiates random access by adopting the first random access procedure based on scheduling-free, the first random access
  • the first configuration information of the access process sends the first information to the base station;
  • the processing unit is configured to determine whether to send the second information to the terminal according to the first result detected by the detection unit and the second configuration information of the first random access process, so that the terminal according to the first An information detects the second information, and according to the second result after the detection, it is determined whether to switch the first random access process to the second random access process based on scheduling contention to initiate random access.
  • a random access process handover system the system includes: a terminal and a base station;
  • the terminal is configured to send first information to the base station according to the first configuration information of the first random access process when the first random access process based on the scheduling-free is used to initiate random access; and detect according to the first information Second information, and according to the second result after the detection, determine whether to switch the first random access process to the second random access process based on scheduling contention to initiate random access;
  • the base station is configured to detect the first information according to a preset random access configuration, and determine whether to send to the terminal according to the first result after the detection and the second configuration information of the first random access process Send the second information.
  • a terminal includes a memory and a processor, and computer-readable instructions are stored in the memory, and the instructions can cause the processor to execute the foregoing method.
  • the embodiment of the present application also provides a computer-readable storage medium, which stores computer-readable instructions, which can cause at least one processor to execute the above-mentioned method.
  • FIG. 1 is a schematic diagram of a handover flow of a random access process in an embodiment of this application
  • FIG. 2 is a schematic diagram of using MAC CE to indicate the number of transmissions of first information in an embodiment of the application
  • Fig. 3 is a schematic diagram of indicating whether the first information is retransmitted in the MAC PDU in an embodiment of the application
  • FIG. 4 is a schematic diagram of the structure of a random access response MAC PDU in an embodiment of the application
  • FIG. 5 is a schematic diagram of the structure of an apparatus applied to a terminal in an embodiment of the application
  • FIG. 6 is a schematic diagram of the structure of an apparatus applied to a base station in an embodiment of the application
  • Figure 7 is a schematic diagram of a random access process handover system in an embodiment of the application.
  • FIG. 8 is a schematic structural diagram of a terminal in an embodiment of the application.
  • An embodiment of the present application provides a random access process switching method.
  • Both the terminal and the base station store the maximum number of transmissions for sending the first information. When the number of transmissions for sending the first information exceeds the maximum number of transmissions, the access has not been successful. , Switch to 4-step RACH; optionally, the terminal carries a retransmission instruction to the base station when sending the first information. The base station determines whether to respond to the second information corresponding to the first information according to the detection result and the system configuration. This solution provides a complete random access procedure.
  • the maximum number of transmissions of the first information based on 2-step RACH can be saved on the base station and the terminal side respectively; if the maximum number of transmissions of the first information based on 2-step RACH is not saved, configure the preset The rule realizes whether the random access process is switched from 2-step RACH to 4-step RACH.
  • the first type the maximum number of transmissions for sending the first information is configured by the base station and the terminal is notified, so that the terminal receives the maximum number of transmissions configured by the base station.
  • the base station When the base station notifies the terminal of the maximum number of transmission times for sending the first information, the maximum number of transmission times for sending the first information is included in the public configuration information for random access and sent to the terminal;
  • the maximum number of transmissions for sending the first information can be included in the following two elements in the common configuration information for random access:
  • RACH-ConfigCommon For example, the parameters in RACH-ConfigCommon are shown as follows:
  • the terminal When receiving the public configuration information for random access from the base station, the terminal reads the maximum number of transmissions for sending the first information from the public configuration information, and stores it in the first configuration information corresponding to the 2-step RACH.
  • the second type configure according to the maximum number of transmissions of the first information agreed by the base station and the terminal.
  • the maximum number of transmissions for sending the first information can be set as an optional configuration, and the base station and the terminal agree on a same value and configure it as the maximum number of transmissions for sending the first information.
  • Fig. 1 is a schematic diagram of a random access process handover flow in an embodiment of the application. The specific steps are:
  • Step 101 When a terminal initiates random access by adopting a first random access procedure based on scheduling-free, it sends first information to a base station according to first configuration information of the first random access procedure.
  • the first random access process based on scheduling-free refers to the aforementioned 2-step RACH
  • the first information includes the preamble sequence and the PUSCH corresponding to the preamble sequence.
  • the base station side detects the first information according to the preset random access configuration, including preamble sequence detection and payload detection in the PUSCH corresponding to the preamble sequence.
  • the first configuration information of the 2-step RACH includes the configuration information of the scheduling-free resource (used to send the PUSCH in the first information), and also includes the maximum number of transmissions for sending the first information.
  • a retransmission indication may also be carried in the first information.
  • the retransmission indication here may include the number of transmissions, whether to retransmit, and whether the number of times of sending the first information reaches the maximum number of transmissions.
  • the number of transmissions here refers to the number of times that the first information is sent when 2-stepRACH is used to initiate random access; whether the content of retransmission is: retransmission or non-retransmission, and the number of retransmissions is not clearly given during retransmission.
  • a counter is set for this random access to record the number of times the first information is sent. If the initial value is 0, each time the first message is sent, the value recorded by the counter increases by 1.
  • the preamble sequence and the first information can be selected according to the first configuration information based on 2-step RACH.
  • the PUSCH resource configuration including time-frequency resource location, DMRS configuration, etc.
  • the first information (such as the aforementioned MsgA) is sent using the selected configuration.
  • the timing of receiving the response information ie, the second information
  • the timing rule is started according to the timing rule.
  • the access rule when the maximum number of transmissions for sending the first information is not maintained on the terminal, the access rule can be pre-configured. For example, when the random access initiated by 2-step RACH fails, it will automatically switch to 4-step. RACH initiates random access; or, it is also possible to stay in 2-step RACH to initiate random access.
  • the first information carries the retransmission instruction, which can be implemented in the following two ways:
  • the first method is to use MAC control unit (CE) or MAC header (header) to indicate at the MAC layer.
  • CE MAC control unit
  • header MAC header
  • one MAC header is composed of one or more MAC subheaders (subheaders), and one MAC subheader may carry a retransmission indication.
  • a MAC CE is added to the MAC PDU to indicate the number of transmissions of the first information; this method uses the MAC PDU to include an indication, such as designing a The new MAC CE is used to indicate the number of transmissions of the first information.
  • FIG. 2 is a schematic diagram of the number of transmissions of the first information using the MAC CE indication.
  • FIG. 2 shows a logical channel ID (LCID) indicating the number of transmissions of the first information.
  • LCID logical channel ID
  • the MAC subheader when the retransmission indication is whether to retransmit, the MAC subheader is used to indicate; since only 1 bit of information is required to indicate whether the first information is retransmission, the MAC subheader may be used to indicate.
  • FIG. 3 is a schematic diagram of indicating whether the first information is a retransmission in the MAC PDU sub-packet header in an embodiment of the application.
  • the logical channel ID (LCID) indicating whether the first information is a retransmission is set, and 1 bit can be used to indicate whether it is a retransmission.
  • LCID logical channel ID
  • the MAC subheader when the retransmission instruction is whether the number of times the first information is sent reaches the maximum number of transmission times, the MAC subheader is used to indicate.
  • the terminal can choose to include the indication in the first information when the first information reaches the maximum number of transmissions; when the maximum number of transmissions is not reached, the terminal can choose not to include the indication in the first information.
  • the second type is the first type:
  • the physical layer uplink control information (UCI) is used to indicate the retransmission instruction of the first information.
  • This method uses the physical layer UCI to include an indication, the UCI is used to indicate information required for PUSCH related detection, and further includes an indication of the number of transmissions of the first information or whether the first information is a retransmission.
  • Step 102 The base station detects the first information according to a preset random access configuration, and determines whether to send to the terminal according to the first result after the detection and the second configuration information for the first random access process Second information.
  • the base station detects the first information (such as MsgA) sent in the 2-step RACH process according to the preset random access configuration, including the preamble sequence and the payload corresponding to the preamble sequence (that is, the payload on the PUSCH in MsgA).
  • the first result after testing includes the following four situations:
  • the second case the preamble sequence is not correctly detected, and the payload is correctly detected
  • the third case the preamble sequence is correctly detected, and the payload is not correctly detected;
  • the fourth case Neither the preamble sequence nor the payload is detected correctly.
  • the terminal responds to the second information corresponding to the first information, that is, sends the second information to the terminal.
  • the second information carries the preamble sequence identification ID corresponding to the first information, and uplink authorization information allocated for switching to the 4-step RACH to send the third information.
  • the preamble sequence is not correctly detected and the number of times that the payload corresponding to the preamble sequence is not correctly detected has not reached the maximum number of times, when responding to the terminal with the second information corresponding to the first information, only the preamble sequence corresponding to the first information is carried Identification ID, which does not allocate the uplink authorization information for switching to the 4-step RACH to send the third information for the terminal.
  • the third information refers to Msg3 in 4-step RACH.
  • the 2-step RACH follows non-adaptive retransmission, which specifically means that when the terminal retransmits the first information of the 2-step RACH, it will select the same preamble sequence as when the first information was previously transmitted.
  • the second information in response may also carry any one or both of timing advance information and TC-RNTI information corresponding to the preamble sequence ID of the first information.
  • the second configuration information does not configure the maximum number of times that the continuous preamble sequence is not correctly detected and the payload corresponding to the preamble sequence is not correctly detected, then the second information is sent, and the second information carries the same value as the first The corresponding preamble sequence ID in the message, and the uplink authorization information allocated for switching to the 4-step RACH to send the third message.
  • the second information further carries either one or both of timing advance information and TC-RNTI information corresponding to the preamble sequence ID of the first information.
  • the figure 4 is a schematic diagram of the random access response MAC PDU structure, where the uplink authorization information is identified as UL Grant, the timing advance information is identified as Time Advance Command, and the TC-RNTI information is identified as Temporary C-RNTI.
  • the base station cannot correctly detect the first information sent by the terminal, and thus cannot feed back the access response corresponding to the contention conflict resolution.
  • the base station can correctly detect the payload, and can feed back the access response corresponding to the contention conflict resolution. In other words, in this case, just stay in the 2-step RACH to complete the random access process.
  • the terminal carries a retransmission indication in the first information
  • the first result is that the payload corresponding to the preamble sequence is detected correctly, and the base station needs to send the second information corresponding to the first information in the 2-step RACH multiple times
  • the specific implementation is as follows:
  • Second information where one response may include second information for multiple terminals.
  • the base station sends the second information to the terminal first, that is, responds to the second information first.
  • a delay threshold can be set to determine whether the delay requirement of the trigger event is high; the transmission times threshold is set to determine whether the number of transmission times carried in the first information is large.
  • the retransmission indication carried in the first information is whether the number of transmissions of the first information reaches the maximum number of transmissions, in multiple terminals, the trigger event corresponding to the first information requires high latency and the transmission carried in the first information For a terminal whose number of times reaches the maximum number of transmissions, the base station sends the second information to the terminal first.
  • the base station preferentially sends the second information to the terminal.
  • the base station When the first information does not carry the retransmission instruction, for the terminal with high delay requirement of the trigger event corresponding to the first information, the base station will send the second information to the terminal first.
  • FIG 4 is a schematic diagram of multiple responses to the second message (MsgB) in the 2-step RACH, which includes multiple uplink grant information UL Grant, timing advance information Time Advance Command, and TC-RNTI information Temporary C-RNTI.
  • Table 1 is the trigger event corresponding to each terminal and the number of transmissions of the first information. Among them, event 1 requires a delay of T1, event 2 requires a delay of T2, and T1 ⁇ T2. It can be seen that the delay demand of event 1 is high. Then the priority order of responses can be: UE2>UE1>UE4>UE3.
  • Step 103 When the terminal receives the second information, it detects the second information according to the first information, and determines whether to switch the first random access process to the second random access based on scheduling competition according to the second result after detection. Process to initiate random access.
  • the terminal uses The uplink authorization transmission is the third information for switching to 4-step RACH.
  • the second type is the first type:
  • the second result is that within the response time range, the second information corresponding to the preamble sequence ID of the first information is detected, and the uplink authorization information is not allocated for switching to 4-step RACH to send the third information, then the first random Whether the number of times the first message is sent during the access process reaches the maximum number of transmissions, if so, switch to 4-step RACH, and initiate the preamble transmission according to its random access configuration. If the received second message carries the timing advance TA, Then, during transmission, adjust the timing according to the TA in the received second message. If the received second message carries TC-RNTI, use the TC-RNTI in the second message for scrambling; otherwise, send the first message again.
  • the received second information carries the timing advance TA
  • the timing adjustment is performed according to the TA in the received second information received
  • the received second information carries TC-RNTI
  • the second information is used
  • the TC-RNTI in TC is scrambled.
  • the third type is the third type.
  • the second result is that the response time has expired and the second information corresponding to the preamble sequence ID in the first information is not detected, it is determined whether the number of times the first information is sent in the first random access process reaches the maximum number of transmissions, if yes , Switch to 4-step RACH, and initiate preamble transmission according to the random access configuration of 4-step RACH; otherwise, send the first information to the base station in 2-step RACH again.
  • random access is re-initiated according to 2-step RACH or 4-step RACH according to system settings.
  • the terminal is configured with the first information retransmission rollback mechanism, rollback first and then re-initiate transmission;
  • An example of a specific backoff mechanism is that if the terminal detects the maximum delay indication of the first information retransmission backoff sent by the base station, the indication value backoff_indicator corresponds to the maximum delay value of the first information retransmission backoff.
  • the terminal may choose to randomly generate a value in [0, backoff_indicator], and the terminal re-initiates transmission after the first information retransmission delay corresponding to the value.
  • non-contention random access conditions are met during the fallback process, random access is initiated according to the non-contention random access configuration.
  • a correlation can be set for the number of transmissions of the first information and the number of preamble transmissions configured in 4-stepRACH.
  • the MsgA transmission count increases by 1
  • the corresponding preamble transmission count increases by 1.
  • the number of transmissions for sending the first information increases, and the number of preamble transmissions configured in the 4-step RACH increases synchronously.
  • the embodiment of the present application provides a random access process switching device, which is applied to a terminal.
  • FIG. 5 is a schematic structural diagram of an apparatus applied to a terminal in an embodiment of the application.
  • the device includes: a sending unit 501, a receiving unit 502, and a processing unit 503;
  • the sending unit 501 is configured to send first information to the base station according to the first configuration information of the first random access process when the first random access process based on the scheduling-free is used to initiate random access, so that the base station Detect the first information according to a preset random access configuration, and determine whether to send the second information to the terminal according to the first result after the detection and the second configuration information of the first random access process ;
  • the receiving unit 502 is configured to receive the second information from the base station
  • the processing unit 503 is configured to detect the second information according to the first information, and determine whether to switch the first random access process to the second random access based on scheduling competition according to the second result after the detection Process to initiate random access.
  • the second information corresponding to the preamble sequence identifier of the first information is detected, and it is switching to the second random access
  • the process of sending the third information allocates uplink authorization information, and the processing unit 503 is specifically configured to use the uplink authorization information to send the third information.
  • the processing unit 503 is configured to determine whether the number of times the first information is sent in the first random access process reaches the maximum number of transmissions, and if so, switch Go to the second random access process, and initiate transmission of the preamble according to the random access configuration of the second random access process; otherwise, send the first information again.
  • the processing unit 503 is configured to determine Whether the number of times the first information is sent in the first random access process reaches the maximum number of transmissions, if so, switch to the second random access process, according to the random number of the second random access process
  • the access configuration initiates the transmission of the preamble; otherwise, the first information is sent to the base station again.
  • the units in the foregoing embodiments can be integrated or deployed separately; they can be combined into one unit or further divided into multiple sub-units.
  • the embodiment of the present application provides a random access process switching device, which is applied to a base station.
  • FIG. 6 is a schematic structural diagram of an apparatus applied to a base station in an embodiment of the application.
  • the device includes: a detection unit 601 and a processing unit 602;
  • the detection unit 601 is configured to detect the first information sent by the terminal according to a preset random access configuration; wherein, when the terminal initiates random access by using the first random access procedure based on scheduling-free, Sending the first configuration information of the random access process to the base station;
  • the processing unit 602 is configured to determine whether to send the second information to the terminal according to the first result detected by the detection unit and the second configuration information of the first random access process, so that the terminal can according to the The first information detects the second information, and according to the second result after the detection, it is determined whether to switch the first random access process to the second random access process based on scheduling contention to initiate random access.
  • the processing unit 602 is specifically configured to detect the current preamble sequence correctly and the payload corresponding to the preamble sequence not If the number of correct detections reaches the maximum number of times, the second information is sent to the terminal, and the second information carries the preamble sequence identifier corresponding to the first information, and is used for switching to the second random connection.
  • the uplink authorization information allocated by the third information is sent during the entry process.
  • the processing unit 602 is specifically configured to send the second information, and send the third information allocation when the second information is carried in the process of switching to the second random access Uplink authorization information.
  • the second information further carries either one or both of the timing advance information corresponding to the preamble sequence identifier and the temporary cell wireless network temporary identification information.
  • the units in the foregoing embodiments can be integrated or deployed separately; they can be combined into one unit or further divided into multiple sub-units.
  • FIG. 7 is a schematic diagram of the random access process switching system in an embodiment of this application.
  • the system includes: terminal and base station;
  • the terminal is configured to send first information to the base station according to the first configuration information of the first random access process when the first random access process based on the scheduling-free is used to initiate random access; and detect according to the first information Second information, and according to the second result after the detection, determine whether to switch the first random access process to the second random access process based on scheduling contention to initiate random access;
  • the base station is configured to detect the first information according to a preset random access configuration, and determine whether to send to the terminal according to the first result after the detection and the second configuration information of the first random access process Send the second information.
  • FIG. 8 is a schematic structural diagram of a terminal according to another embodiment of the present application.
  • the terminal 800 may include a processor 810, a memory 820, a port 830, and a bus 840.
  • the processor 810 and the memory 820 are interconnected through a bus 840.
  • the processor 810 may receive and transmit data through the port 830. among them,
  • the processor 810 is configured to execute a machine-readable instruction module stored in the memory 820.
  • the memory 820 stores a machine-readable instruction module executable by the processor 810.
  • the instruction modules executable by the processor 810 include: a sending unit 821, a receiving unit 822, and a processing unit 823. among them,
  • the sending unit 821 when the random access is initiated by the first random access procedure based on scheduling-free, the first information is sent to the base station according to the first configuration information of the first random access procedure. , So that the base station detects the first information according to the preset random access configuration, and determines whether to send information to the station according to the first result after the detection and the second configuration information of the first random access process.
  • the terminal sends second information;
  • the receiving unit 822 When the receiving unit 822 is executed by the processor 810, it may be: receiving the second information from the base station;
  • the processing unit 823 When the processing unit 823 is executed by the processor 810, it may detect the second information according to the first information, and determine whether to switch the first random access process to based on scheduling contention according to the second result after the detection. The second random access process to initiate random access.
  • each embodiment of the present application can be implemented by a data processing program executed by a data processing device such as a computer.
  • the data processing program constitutes this application.
  • a data processing program usually stored in a storage medium is executed by directly reading the program out of the storage medium or by installing or copying the program to a storage device (such as a hard disk and/or a memory) of the data processing device. Therefore, such a storage medium also constitutes the present application.
  • the storage medium can use any type of recording method, such as paper storage medium (such as paper tape, etc.), magnetic storage medium (such as floppy disk, hard disk, flash memory, etc.), optical storage medium (such as CD-ROM, etc.), magneto-optical storage medium ( Such as MO, etc.) etc.
  • the embodiment of the present application also discloses a storage medium in which a data processing program is stored, and the data processing program is used to execute any embodiment of the foregoing method of the present application.
  • the base station configures the maximum number of transmissions for the first message (MsgA) based on the non-scheduling random access process (2-step RACH), and the terminal side counts the number of transmissions of the first message (MsgA)
  • the terminal returns to the random access process (4-step RACH) based on scheduling contention, and the terminal can indicate to the base station the number of transmissions or whether it is a retransmission in the first message (MsgA) for The base station feeds back the random access response reference.

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Abstract

本申请提供了一种随机接入过程切换方法、装置、系统、终端和存储介质，该方法应用于终端，包括：当采用基于免调度的第一随机接入过程发起随机接入时，根据所述第一随机接入过程的第一配置信息向基站发送第一信息，以使所述基站根据预设的随机接入配置对所述第一信息进行检测，并根据检测后的第一结果以及所述第一随机接入过程的第二配置信息，确定是否向所述终端发送第二信息；当终端接收到所述第二信息时，根据所述第一信息检测所述第二信息，并根据检测后的第二结果，确定是否将所述第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入。

Description

一种随机接入过程切换方法、装置、系统、终端和存储介质
本申请要求于2019年2月15日提交中国专利局、申请号为201910116172.8、申请名称为“一种随机接入过程切换方法、装置和系统”的中国专利申请的优先权。
技术领域
本申请涉及通信技术领域，特别涉及一种随机接入过程切换方法、装置、系统、终端和存储介质。
发明背景
在现有4G和5G定义的基于竞争方式的随机接入过程中，终端和基站之间至少需要进行四次信令的交互，称之为四步基于调度竞争的随机接入过程(简称为4-step RACH)，示例如下：
第一次：终端向基站发送消息Msg1，Msg1为终端按照标准38.321或36.321中设定规则选择前导序列，用于基站进行定时提前(TA)估计等；
第二次：基站向终端发送消息Msg2，Msg2为Msg1的随机接入响应，其中包含了前导序列标识、TA、终端向基站发送Msg3的上行授权信息、临时小区无线网络临时标识(TC-RNTI)等；
第三次：终端向基站发送消息Msg3，当终端在Msg2中读取到Msg1对应的前导序列标识时，再发送Msg3，Msg3的内容与触发随机接入过程的事件相关；
第四次：基站向终端发送消息Msg4，Msg4为解决竞争冲突的响应，当终端检测到的Msg4中包含对应Msg3中相关的标识信息时，则视为随机接入成功。
在技术的进一步研究中，将考虑简化基于竞争方式的随机过程，降低信令开销和随机接入时延，提出一种新的随机接入过程，终端和基站之间执行至少两次信令的交互即可，称之为两步基于免调度的随机接入过程(简称为2-step RACH)，示例如下：
第一次：终端向基站发送消息MsgA，承担4-step RACH中Msg1和Msg3的功能，为前导序列+物理上行共享信道(PUSCH)的传输结构，主要作用在于利用前导序列和解调参考信号(DMRS)进行信道和TA估计，不同RACH触发事件下MsgA对应的媒体接入控制(MAC)协议数据单元(PDU)包含不同的内容，其中MsgA对应的PUSCH资源由基站进行免调度配置，前导序列和所述PUSCH直接存在一定的映射关系，降低资源选择冲突；
第二次：基站向终端发送消息MsgB，承担4-step RACH中Msg2和Msg4的功能，主要用于指示随机接入的TA、TC-RNTI分配、上行数据传输的授权以及竞争冲突解决等。
现有技术中未提供从2-step RACH的MsgA中前导序列及PUSCH均检测失败时切换至4-step RACH的具体解决方案。
发明内容
有鉴于此，本申请提供一种随机接入过程切换方法、装置、系统、终端和存储介质，实现了一种完善的随机接入过程。
为解决上述技术问题，本申请的技术方案是这样实现的：
一种随机接入过程切换方法，应用于终端，该方法包括：
当采用基于免调度的第一随机接入过程发起随机接入时，根据所述第一随机接入过程的第一配置信息向基站发送第一信息，以使所述基站根据预设的随机接入配置对所述第一信息进行检测，并根据检测后的第 一结果以及所述第一随机接入过程的第二配置信息，确定是否向所述终端发送第二信息；
当终端接收到所述第二信息时，根据所述第一信息检测所述第二信息，并根据检测后的第二结果，确定是否将所述第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入。
一种随机接入过程切换装置，应用于终端上，该装置包括：
发送单元，用于当采用基于免调度的第一随机接入过程发起随机接入时，根据所述第一随机接入过程的第一配置信息向基站发送第一信息，以使所述基站根据预设的随机接入配置对所述第一信息进行检测，并根据检测后的第一结果以及所述第一随机接入过程的第二配置信息，确定是否向所述终端发送第二信息；
接收单元，用于从所述基站接收所述第二信息；
处理单元，用于根据所述第一信息检测所述第二信息，并根据检测后的第二结果，确定是否将所述第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入。
一种随机接入过程切换装置，应用于基站上，该装置包括：
检测单元，用于根据预设的随机接入配置检测终端发送的第一信息；其中，所述终端在采用基于免调度的第一随机接入过程发起随机接入时，根据所述第一随机接入过程的第一配置信息向所述基站发送所述第一信息；
处理单元，用于根据所述检测单元检测的第一结果以及所述第一随机接入过程的第二配置信息，确定是否向所述终端发送第二信息，以使所述终端根据所述第一信息检测所述第二信息，并根据检测后的第二结果，确定是否将所述第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入。
一种随机接入过程切换系统，该系统包括：终端和基站；
终端，用于当采用基于免调度的第一随机接入过程发起随机接入时，根据所述第一随机接入过程的第一配置信息向基站发送第一信息；根据所述第一信息检测第二信息，并根据检测后的第二结果，确定是否将所述第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入；
基站，用于根据预设的随机接入配置对所述第一信息进行检测，并根据检测后的第一结果以及所述第一随机接入过程的第二配置信息，确定是否向所述终端发送所述第二信息。
一种终端，包括存储器和处理器，所述存储器中存储有计算机可读指令，所述指令可以使所述处理器执行上述的方法。
本申请实施例还提供了一种计算机可读存储介质，存储有计算机可读指令，可以使至少一个处理器执行上述的方法。
附图简要说明
图1为本申请实施例中随机接入过程切换流程示意图；
图2为本申请实施例中使用MAC CE指示第一信息的传输次数的示意图；
图3为本申请实施例中在MAC PDU中指示第一信息是否重传的示意图；
图4为本申请实施例中随机接入响应MAC PDU的结构示意图；
图5为本申请实施例中应用于终端上的装置结构示意图；
图6为本申请实施例中应用于基站上的装置结构示意图；
图7为本申请实施例中随机接入过程切换系统示意图；
图8为本申请实施例中终端的结构示意图。
实施方式
这里将详细地对示例性实施例执行说明，其示例表示在附图中。下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本申请相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本申请的一些方面相一致的装置和方法的例子。
为了使本申请的目的、技术方案及优点更加清楚明白，下面结合附图并举实施例，对本申请的技术方案进行详细说明。
本申请实施例中提供一种随机接入过程切换方法，在终端和基站侧均存储发送第一信息的最大传输次数，当发送第一信息的传输次数超过最大传输次数，还未成功接入时，切换到4-step RACH；可选地，终端在发送第一信息时携带重传指示给基站。基站根据检测结果，以及系统配置确定是否响应第一信息对应的第二信息。该方案提供了一种完善的随机接入过程。
下面结合附图，详细描述本申请实施例中随机接入过程切换的过程。
本申请实施例中可以在基站和终端侧分别保存基于2-step RACH的发送第一信息的最大传输次数；若不保存基于2-step RACH的发送第一信息的最大传输次数，则配置预设规则实现随机接入过程是否由2-step RACH切换为4-step RACH。
针对保存发送第一信息的最大传输次数的实现方式有两种：
第一种：发送第一信息的最大传输次数由基站配置，并通知终端，这样，终端接收基站配置的最大传输次数。
基站通知终端发送第一信息的最大传输次数时，将发送第一信息的 最大传输次数包含在随机接入的公共配置信息中发送给终端；
发送第一信息的最大传输次数可以包含在随机接入的公共配置信息中如下两个元素中：
RACH-ConfigCommon、RACH-ConfigGeneric。
如在RACH-ConfigCommon中的参数示意为：
--ASN1START
--TAG-RACH-CONFIG-COMMON-START
RACH-ConfigCommon::＝ SEQUENCE{
MsgA-TransMax ENUMERATED{设定最大传输次数数值}
终端从基站接收到随机接入的公共配置信息时，从公共配置信息中读取发送第一信息的最大传输次数，并存储到2-step RACH对应的第一配置信息中。
第二种：根据基站与终端约定的发送第一信息的最大传输次数进行配置。
发送第一信息的最大传输次数可设置为可选配置，基站和终端约定一个相同的值配置为发送第一信息的最大传输次数。
参见图1，图1为本申请实施例中随机接入过程切换流程示意图。具体步骤为：
步骤101，当终端采用基于免调度的第一随机接入过程发起随机接入时，根据第一随机接入过程的第一配置信息向基站发送第一信息。
其中，基于免调度的第一随机接入过程指前述2-step RACH，第一信息包括前导序列和前导序列对应的PUSCH。基站侧根据预设的随机 接入配置对第一信息检测包括了前导序列检测以及前导序列对应的PUSCH中有效负载检测。
2-step RACH的第一配置信息，包括免调度资源(用于发送第一信息中的PUSCH)的配置信息，还包括发送第一信息的最大传输次数。
本申请实施例中，在采用2-step RACH发起随机接入时，还可以在第一信息中携带重传指示。
这里的重传指示可以包括传输次数、是否重传、以及发送第一信息的次数是否达到最大传输次数。这里的传输次数指的是采用2-stepRACH发起随机接入时，发送第一信息的次数；是否重传的内容为：重传，或非重传，重传时不明确给出重传的次数的一种实现；是否达到最大传输次数，即发送第一信息的次数是否达到发送第一信息的最大传输次数。
本申请一实施例中，当终端上保存发送第一信息的最大传输次数时，在终端首次发送第一信息时，针对该次随机接入设置一个计数器，用于记录发送第一信息的次数。如初始值为0，每发送一次第一信息，该计数器记录的值增加1。
当随机接入过程的触发事件满足基于2-step RACH的条件时，采用2-step RACH发起随机接入，此时可以根据基于2-step RACH的第一配置信息选择前导序列和第一信息中PUSCH的资源配置(包括时频资源位置、DMRS配置等)，利用选择的配置发送所述第一信息(如前述MsgA)。在发送第一信息之后，根据定时规则启动接收第一信息对应的响应信息(即第二信息)的定时。
本申请另一实施例中，当终端上未保持发送第一信息的最大传输次数时，可以预先配置接入规则，如在采用2-step RACH发起随机接入失败时，自动切换到4-step RACH发起随机接入；或者，也可以仍停留在 2-step RACH发起随机接入。
第一信息携带重传指示，具体有如下两种实现方式：
第一种：在MAC层利用MAC控制单元(CE)或者MAC头部(header)的方式指示。具体地，一个MAC头部由一个或多个MAC子包头(subheader)组成，可以在一个MAC子包头中携带重传指示。
在本申请一实施例中，当重传指示为第一信息的传输次数时，在MAC PDU中新增MAC CE来指示第一信息的传输次数；该方式利用MAC PDU中包含指示，如设计一个新的MAC CE用于指示第一信息的传输次数。
参见图2，图2为第一信息的传输次数使用MAC CE指示的示意图。图2中示出了指示第一信息的传输次数的逻辑信道ID(LCID)。
在本申请另一实施例中，当重传指示为是否重传时，采用MAC subheader的方式指示；由于指示第一信息是否为重传只需要1比特信息，因此可以采用MAC subheader的方式指示。
参见图3，图3为本申请实施例中在MAC PDU子包头中指示第一信息是否为重传的示意图。图3中，设定指示第一信息是否为重传的逻辑信道ID(LCID)，可以利用1bit指示是否为重传。
在本申请又一实施例中，当重传指示为发送第一信息的次数是否达到最大传输次数时，采用MAC subheader的方式指示。
由于指示第一信息是否达到最大传输次数只需要1比特信息，因此可以采用MAC subheader的方式指示，信息格式可以同图3。进一步地，终端可选择当第一信息达到最大传输次数时，在第一信息中包含该指示；未达到最大传输次数时，可选择不在第一信息中包含该指示。
第二种：
使用物理层上行控制信息(UCI)指示第一信息的重传指示。
该方式利用物理层UCI包含指示，该UCI用于指示PUSCH相关检测需要的信息，并进一步包括指示第一信息的传输次数或者该第一信息是否为重传。
步骤102，基站根据预设的随机接入配置对所述第一信息进行检测，并根据检测后的第一结果以及针对所述第一随机接入过程的第二配置信息，确定是否向终端发送第二信息。
基站根据预设的随机接入配置对2-step RACH过程中发送的第一信息(如MsgA)进行检测，包括前导序列和前导序列对应的有效负载(即MsgA中PUSCH上的有效负载payload)检测，检测后的第一结果包括以下四种情况：
第一种情况：前导序列和有效负载均被正确检测；
第二种情况：前导序列未被正确检测，有效负载被正确检测；
第三种情况：前导序列被正确检测，有效负载未被正确检测；
第四种情况：前导序列和有效负载均未被正确检测。
针对第三种情况：本申请实施例中，根据检测后的第一结果以及第二配置信息，确定是否向终端发送第二信息，给出如下处理过程：
在一示例中，如果第二配置信息指示2 step-RACH遵循非自适应重传，以及连续前导序列被正确检测、前导序列对应的有效负载未被正确检测的最大次数，则当前导序列未被正确检测、前导序列对应的有效负载未被正确检测的次数达到该最大次数时，则向终端响应与第一信息对应的第二信息，即向终端发送第二信息。其中，该第二信息中携带与第一信息对应的前导序列标识ID，以及为切换到4-step RACH中发送第三信息分配的上行授权信息。
如果前导序列未被正确检测、前导序列对应的有效负载未被正确检 测的次数未达到最大次数，则向终端响应与第一信息对应的第二信息时，仅携带与第一信息对应的前导序列标识ID，不为该终端分配切换到4-step RACH发送第三信息的上行授权信息。其中，所述第三信息指4-step RACH中的Msg3。
其中，所述2-step RACH遵循非自适应重传，具体是指终端重传2-step RACH的第一信息时，将选择与之前传输第一信息时相同的前导序列。
进一步地，响应的第二信息还可携带与第一信息的前导序列ID对应的定时提前信息和TC-RNTI信息中的任一个或两个。
在另一示例中，若第二配置信息未配置连续前导序列未被正确检测、前导序列对应的有效负载未被正确检测的最大次数，则发送第二信息，在第二信息中携带与第一信息中对应的前导序列ID，以及为切换到4-step RACH中发送第三信息分配的上行授权信息。
所述第二信息进一步还携带与第一信息前导序列ID对应的定时提前信息和TC-RNTI信息中的任一个或两个。
在上述第二信息中发送与第一信息中前导序列ID对应的定时提前信息以及TC-RNTI信息，以及为切换到4-step RACH中发送第三信息(Msg3)分配的上行授权信息时，图4为随机接入响应MAC PDU的结构示意图，其中，上行授权信息标识为UL Grant，定时提前信息标识为Time Advance Command和TC-RNTI信息标识为Temporary C-RNTI。
针对上述第四种情况，基站无法正确检测终端发送的第一信息，进而无法反馈解决其竞争冲突对应的接入响应。
针对第一种和第二种检测结果，基站均可以正确检测有效负载，则可以反馈解决竞争冲突对应的接入响应。也就是说，对于这种情况，直接停留在2-step RACH完成随机接入过程即可。
进一步地，如果终端在第一信息中携带重传指示，第一结果为前导序列对应的有效负载检测正确，且基站需要分多次发送2-step RACH中第一信息对应的第二信息时，具体执行如下处理：
当第一信息携带的重传指示为第一信息的传输次数时，若基站需分多次发送2-step RACH中的第一信息对应的第二信息，即分多次向不同的终端发送第二信息，其中一次响应可以包含针对多个终端的第二信息。在多个终端中，针对第一信息对应的触发事件时延需求高、并且第一信息中携带的传输次数值大的终端，基站优先向该终端发送第二信息，即优先响应第二信息。
在具体实现时，可以设置时延阈值来判断触发事件时延需求是否为高；设置传输次数阈值来判断第一信息中携带的传输次数数值是否大。
当第一信息携带的重传指示为第一信息的传输次数是否达到最大传输次数时，在多个终端中，针对第一信息对应的触发事件时延需求高、并且第一信息中携带的传输次数达到最大传输次数的终端，基站优先向该终端发送第二信息。
当第一信息携带的重传指示为是否重传时，在多个终端中，针对第一信息对应的触发事件时延需求高、并且第一信息中携带的重传指示为重传的终端，基站优先向该终端发送第二信息。
当第一信息未携带重传指示时，针对第一信息对应的触发事件时延需求高的终端，基站将优先向该中的发送第二信息。
参见图4，图4为2-step RACH中多次响应第二信息(MsgB)示意图，其中包括多个上行授权信息UL Grant，定时提前信息Time Advance Command和TC-RNTI信息Temporary C-RNTI。
以第一信息携带传输次数为例，根据触发事件时延需求由高到底排序，对于相同触发事件进一步再根据第一信息的传输次数排序，假设存 在如下四个终端：UE1、UE2、UE3和UE4。参见表1，表1为各终端对应的触发事件及第一信息的传输次数。其中，事件1要求时延为T1，事件2要求时延为T2，T1<T2，可见，事件1的时延需求高。那么响应的优先顺序可以为：UE2>UE1>UE4>UE3。
终端 触发事件 第一信息的传输次数
UE1 事件1 1
UE2 事件1 2
UE3 事件2 1
UE4 事件2 2
表1
步骤103，当终端接收到第二信息时，根据第一信息检测第二信息，并根据检测后的第二结果，确定是否将第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入。
本步骤中，根据第二结果，确定是否将第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入，具体实现时，分如下四种情况：
第一种：
若第二结果为在响应时间范围内，检测到与发送的第一信息的前导序列ID对应的第二信息，且为切换到4-step RACH发送第三信息分配了上行授权信息，则终端利用上行授权发送为切换到4-step RACH的第三信息。
第二种：
若第二结果为在响应时间范围内，检测到与第一信息的前导序列ID对应的第二信息，且未为切换到4-step RACH发送第三信息分配上行授权信息，则确定第一随机接入过程中发送第一信息的次数是否达到最大 传输次数，如果是，切换到4-step RACH，根据其随机接入配置发起前导的传输，若接收到的第二信息中携带定时提前TA，则在传输时根据接收到第二信息中的TA进行定时调整，若接收到的第二信息中携带TC-RNTI，则利用第二信息中的TC-RNTI进行加扰；否则，再次发送第一信息，若接收到的第二信息中携带定时提前TA，则根据接收到的接收到第二信息中的TA进行定时调整，若接收到的第二信息中携带TC-RNTI，则利用第二信息中的TC-RNTI进行加扰。
第三种：
若第二结果为响应时间超时，未检测到与第一信息中的前导序列ID对应的第二信息，则确定第一随机接入过程中发送第一信息的次数是否达到最大传输次数，如果是，切换到4-step RACH，根据4-step RACH的随机接入配置发起前导的传输；否则，再次在2-step RACH中向基站发送第一信息。
第四种：
为了兼容现有实现，如果本地未保存发送第一信息的最大传输次数，则根据系统设定，按照2-step RACH或者4-step RACH重新发起随机接入。
进一步地，若终端配置了第一信息重传回退机制，则先回退再重新发起传输；
具体回退机制示例为，如果终端检测到基站发送的第一信息重传回退的最大时延指示，其中指示数值backoff_indicator对应第一信息重传回退的最大时延数值。终端可以选择在[0,backoff_indicator]随机产生一个数值，终端在该数值对应的第一信息重传时延之后，重新发起传输。
若在回退过程中满足非竞争随机接入条件，则根据非竞争随机接入 配置发起随机接入。
进一步地，对于第一信息的传输次数与针对4-stepRACH中配置的前导传输次数，可以设定一个相互关系，当MsgA传输次数计数增加1时，对应前导传输次数计数同步增加1。具体实现如下：
进行2-step RACH时，发送第一信息的传输次数增加，则针对4-stepRACH中配置的前导传输次数同步增加。
基于同样的发明构思，本申请实施例中提供一种随机接入过程切换装置，应用于终端上。参见图5，图5为本申请实施例中应用于终端上的装置结构示意图。该装置包括：发送单元501、接收单元502和处理单元503；
发送单元501，用于当采用基于免调度的第一随机接入过程发起随机接入时，根据所述第一随机接入过程的第一配置信息向基站发送第一信息，以使所述基站根据预设的随机接入配置对所述第一信息进行检测，并根据检测后的第一结果以及所述第一随机接入过程的第二配置信息，确定是否向所述终端发送第二信息；
接收单元502，用于从基站接收所述第二信息；
处理单元503，用于根据所述第一信息检测所述第二信息，并根据检测后的第二结果，确定是否将所述第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入。
在本申请一实施例中，若所述第二结果为在响应时间范围内，检测到与所述第一信息的前导序列标识对应的第二信息，且为切换到所述第二随机接入过程发送第三信息分配了上行授权信息，处理单元503，具体用于利用所述上行授权信息发送所述第三信息。
在本申请一实施例中，若所述第二结果为在响应时间范围内，检测 到与所述第一信息的前导序列标识对应的第二信息，且未为切换到所述第二随机接入过程发送第三信息分配上行授权信息，则所述处理单元503用于，确定所述第一随机接入过程中发送所述第一信息的次数是否达到所述最大传输次数，如果是，切换到所述第二随机接入过程，并根据所述第二随机接入过程的随机接入配置发起前导的传输；否则，再次发送所述第一信息。
在本申请一实施例中，若所述第二结果为响应时间超时，未检测到与所述第一信息中的前导序列标识相对应的第二信息，则所述处理单元503用于，确定所述第一随机接入过程中发送所述第一信息的次数是否达到所述最大传输次数，如果是，切换到所述第二随机接入过程，根据所述第二随机接入过程的随机接入配置发起前导的传输；否则，再次向所述基站发送所述第一信息。
上述实施例的单元可以集成于一体，也可以分离部署；可以合并为一个单元，也可以进一步拆分成多个子单元。
基于同样的发明构思，本申请实施例中提供一种随机接入过程切换装置，应用于基站上。参见图6，图6为本申请实施例中应用于基站上的装置结构示意图。该装置包括：检测单元601和处理单元602；
检测单元601，用于根据预设的随机接入配置检测终端发送的第一信息；其中，所述终端在采用基于免调度的第一随机接入过程发起随机接入时，根据所述第一随机接入过程的第一配置信息向所述基站发送所述第一信息；
处理单元602，用于根据所述检测单元检测的第一结果以及所述第一随机接入过程的第二配置信息，确定是否向所述终端发送第二信息，以使所述终端根据所述第一信息检测所述第二信息，并根据检测后的第 二结果，确定是否将所述第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入。
在本申请一实施例中，若所述第一结果为前导序列被正确检测、前导序列对应的有效负载未被正确检测，所述第二配置信息中指示所述第一随机接入过程遵循非自适应重传，以及连续前导序列被正确检测、前导序列对应的有效负载未被正确检测的最大次数，则处理单元602，具体用于当前导序列被正确检测、前导序列对应的有效负载未被正确检测的次数达到该最大次数，则向所述终端发送所述第二信息，所述第二信息中携带与所述第一信息对应的前导序列标识，以及为切换到所述第二随机接入过程中发送第三信息分配的上行授权信息。
在本申请一实施例中，若所述第一结果为前导序列被正确检测、前导序列对应的有效负载未被正确检测，所述第二配置信息未配置连续前导序列被正确检测、前导序列对应的有效负载未被正确检测的最大次数，则处理单元602，具体用于发送所述第二信息，在所述第二信息携带为切换到所述第二随机接入过程中发送第三信息分配的上行授权信息。
在本申请一实施例中，所述第二信息还携带与所述前导序列标识对应的定时提前信息和临时小区无线网络临时标识信息中的任一个信息或两个信息。
上述实施例的单元可以集成于一体，也可以分离部署；可以合并为一个单元，也可以进一步拆分成多个子单元。
此外，本申请实施例中基于同样的发明构思，还提供一种随机接入过程切换系统，参见图7，图7为本申请实施例中随机接入过程切换系统示意图。该系统包括：终端和基站；
终端，用于当采用基于免调度的第一随机接入过程发起随机接入时，根据所述第一随机接入过程的第一配置信息向基站发送第一信息；根据所述第一信息检测第二信息，并根据检测后的第二结果，确定是否将所述第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入；
基站，用于根据预设的随机接入配置对所述第一信息进行检测，并根据检测后的第一结果以及所述第一随机接入过程的第二配置信息，确定是否向所述终端发送所述第二信息。
此外，本申请实施例还提供一种终端，参见图8。图8为依据本申请又一实施例的终端的结构示意图。该终端800可包括：处理器810、存储器820、端口830以及总线840。处理器810和存储器820通过总线840互联。处理器810可通过端口830接收和发送数据。其中，
处理器810用于执行存储器820存储的机器可读指令模块。
存储器820存储有处理器810可执行的机器可读指令模块。处理器810可执行的指令模块包括：发送单元821、接收单元822和处理单元823。其中，
发送单元821被处理器810执行时可以为：当采用基于免调度的第一随机接入过程发起随机接入时，根据所述第一随机接入过程的第一配置信息向基站发送第一信息，以使所述基站根据预设的随机接入配置对所述第一信息进行检测，并根据检测后的第一结果以及所述第一随机接入过程的第二配置信息，确定是否向所述终端发送第二信息；
接收单元822被处理器810执行时可以为：从所述基站接收所述第二信息；
处理单元823被处理器810执行时可以为：根据所述第一信息检测 所述第二信息，并根据检测后的第二结果，确定是否将所述第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入。
由此可以看出，当存储在存储器820中的指令模块被处理器810执行时，可实现前述图5所示实施例中各个单元的各种功能。
另外，本申请的每一个实施例可以通过由数据处理设备如计算机执行的数据处理程序来实现。显然，数据处理程序构成了本申请。此外，通常存储在一个存储介质中的数据处理程序通过直接将程序读取出存储介质或者通过将程序安装或复制到数据处理设备的存储设备(如硬盘和或内存)中执行。因此，这样的存储介质也构成了本申请。存储介质可以使用任何类型的记录方式，例如纸张存储介质(如纸带等)、磁存储介质(如软盘、硬盘、闪存等)、光存储介质(如CD-ROM等)、磁光存储介质(如MO等)等。
因此，本申请实施例还公开了一种存储介质，其中存储有数据处理程序，该数据处理程序用于执行本申请上述方法的任何一种实施例。
综上所述，本申请通过基站为基于免调度的随机接入过程(2-step RACH)发送第一信息(MsgA)配置最大传输次数，终端侧进行所述第一信息(MsgA)传输次数计数，当超过最大传输次数时，终端退回基于调度竞争的随机接入过程(4-step RACH)，终端可在第一信息(MsgA)中将其传输次数或是否为重传指示给基站，用于基站反馈随机接入响应参考。
以上所述仅为本申请的较佳实施例而已，并不用以限制本申请，凡在本申请的精神和原则之内，所做的任何修改、等同替换、改进等，均 应包含在本申请保护的范围之内。

Claims (22)

  1. 一种随机接入过程切换方法，应用于终端，该方法包括：
    当采用基于免调度的第一随机接入过程发起随机接入时，根据所述第一随机接入过程的第一配置信息向基站发送第一信息，以使所述基站根据预设的随机接入配置对所述第一信息进行检测，并根据检测后的第一结果以及所述第一随机接入过程的第二配置信息，确定是否向所述终端发送第二信息；
    当终端接收到所述第二信息时，根据所述第一信息检测所述第二信息，并根据检测后的第二结果，确定是否将所述第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入。
  2. 根据权利要求1所述的方法，其中，所述第一配置信息包括发送所述第一信息的最大传输次数，所述方法进一步包括：
    接收所述基站配置的所述最大传输次数；或，
    根据所述基站与所述终端的约定，配置最大传输次数。
  3. 根据权利要求2所述的方法，其中，所述接收所述基站配置的所述最大传输次数包括：
    从所述基站接收随机接入的公共配置信息；
    从所述公共配置信息中读取所述最大传输次数。
  4. 根据权利要求1所述的方法，其中，若所述第一结果为前导序列被正确检测、前导序列对应的有效负载未被正确检测，所述第二配置信息未配置连续前导序列被正确检测、前导序列对应的有效负载未被正确检测的最大次数，则根据检测后的第一结果以及针对所述第一随机过程的第二配置信息，确定是否向所述终端发送第二信息，包括：
    发送所述第二信息，在所述第二信息携带与所述第一信息中对应的 前导序列标识，以及为切换到所述第二随机接入过程中发送第三信息分配的上行授权信息。
  5. 根据权利要求4所述的方法，其中，所述第二信息还携带与所述前导序列标识对应的定时提前信息和临时小区无线网络临时标识信息中的任一个信息或两个信息。
  6. 根据权利要求1-4中任一项所述的方法，其中，若所述第二结果为在响应时间范围内，检测到与所述第一信息的前导序列标识对应的第二信息，且为切换到所述第二随机接入过程发送第三信息分配了上行授权信息，则所述根据检测后的第二结果，确定是否将所述第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入，包括：
    利用所述上行授权信息发送所述第三信息。
  7. 根据权利要求1-4中任一项所述的方法，其中，若所述第二结果为响应时间超时，未检测到与所述第一信息中的前导序列标识相对应的第二信息，则所述根据检测后的第二结果，确定是否将所述第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入，包括：
    确定所述第一随机接入过程中发送所述第一信息的次数是否达到所述最大传输次数，如果是，切换到所述第二随机接入过程，根据所述第二随机接入过程的随机接入配置发起前导的传输；否则，再次向所述基站发送所述第一信息。
  8. 根据权利要求1-4中任一项所述的方法，其中，若所述终端配置了第一信息重传回退机制，所述方法进一步包括：
    先回退，再重新发起传输；
    若在回退过程中满足非竞争随机接入条件，则根据非竞争随机接入配置发起随机接入。
  9. 根据权利要求1-4中任一项所述的方法，其中，当确定以所述第二随机接入过程发起随机接入时，所述方法进一步包括：
    若进行所述第一随机接入过程时发送所述第一信息的传输次数增加，则针对所述第二随机接入过程配置的前导传输次数同步增加。
  10. 一种随机接入过程切换装置，应用于终端上，该装置包括：
    发送单元，用于当采用基于免调度的第一随机接入过程发起随机接入时，根据所述第一随机接入过程的第一配置信息向基站发送第一信息，以使所述基站根据预设的随机接入配置对所述第一信息进行检测，并根据检测后的第一结果以及所述第一随机接入过程的第二配置信息，确定是否向所述终端发送第二信息；
    接收单元，用于从所述基站接收所述第二信息；
    处理单元，用于根据所述第一信息检测所述第二信息，并根据检测后的第二结果，确定是否将所述第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入。
  11. 根据权利要求10所述的装置，其中，所述第一配置信息包括发送所述第一信息的最大传输次数，所述接收单元进一步用于，接收所述基站配置的所述最大传输次数；或，根据所述基站与所述终端的约定，配置最大传输次数。
  12. 根据权利要求11所述的装置，其中，所述接收单元用于，从所述基站接收随机接入的公共配置信息；从所述公共配置信息中读取所述最大传输次数。
  13. 根据权利要求10-12中任一项所述的装置，其中，若所述第二结果为在响应时间范围内，检测到与所述第一信息的前导序列标识对应的第二信息，且为切换到所述第二随机接入过程发送第三信息分配了上行授权信息，则所述处理单元用于，利用所述上行授权信息发送所述第 三信息。
  14. 根据权利要求10-12中任一项所述的装置，其中，若所述第二结果为响应时间超时，未检测到与所述第一信息中的前导序列标识相对应的第二信息，则所述处理单元用于，确定所述第一随机接入过程中发送所述第一信息的次数是否达到所述最大传输次数，如果是，切换到所述第二随机接入过程，根据所述第二随机接入过程的随机接入配置发起前导的传输；否则，再次向所述基站发送所述第一信息。
  15. 根据权利要求10-12中任一项所述的装置，其中，若所述终端配置了第一信息重传回退机制，所述发送单元进一步用于，先回退，再重新发起传输；若在回退过程中满足非竞争随机接入条件，则根据非竞争随机接入配置发起随机接入。
  16. 根据权利要求10-12中任一项所述的装置，其中，当确定以所述第二随机接入过程发起随机接入时，所述发送单元进一步用于，若进行所述第一随机接入过程时发送所述第一信息的传输次数增加，则针对所述第二随机接入过程配置的前导传输次数同步增加。
  17. 一种随机接入过程切换装置，应用于基站上，该装置包括：
    检测单元，用于根据预设的随机接入配置检测终端发送的第一信息；其中，所述终端在采用基于免调度的第一随机接入过程发起随机接入时，根据所述第一随机接入过程的第一配置信息向所述基站发送所述第一信息；
    处理单元，用于根据所述检测单元检测的第一结果以及所述第一随机接入过程的第二配置信息，确定是否向所述终端发送第二信息，以使所述终端根据所述第一信息检测所述第二信息，并根据检测后的第二结果，确定是否将所述第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入。
  18. 根据权利要求17所述的装置，其中，若所述第一结果为前导序列被正确检测、前导序列对应的有效负载未被正确检测，所述第二配置信息未配置连续前导序列被正确检测、前导序列对应的有效负载未被正确检测的最大次数，则所述处理单元用于，发送所述第二信息，在所述第二信息携带与所述第一信息中对应的前导序列标识，以及为切换到所述第二随机接入过程中发送第三信息分配的上行授权信息。
  19. 根据权利要求18所述的装置，其中，所述第二信息还携带与所述前导序列标识对应的定时提前信息和临时小区无线网络临时标识信息中的任一个信息或两个信息。
  20. 一种随机接入过程切换系统，该系统包括：
    终端，用于当采用基于免调度的第一随机接入过程发起随机接入时，根据所述第一随机接入过程的第一配置信息向基站发送第一信息；根据所述第一信息检测第二信息，并根据检测后的第二结果，确定是否将所述第一随机接入过程切换为基于调度竞争的第二随机接入过程以发起随机接入；
    基站，用于根据预设的随机接入配置对所述第一信息进行检测，并根据检测后的第一结果以及所述第一随机接入过程的第二配置信息，确定是否向所述终端发送所述第二信息。
  21. 一种终端，其特征在于，包括存储器和处理器，所述存储器中存储有计算机可读指令，所述指令可以使所述处理器执行如权利要求1至9中任一项所述的方法。
  22. 一种计算机可读存储介质，其特征在于，存储有计算机可读指令，可以使至少一个处理器执行如权利要求1至9中任一项所述的方法。
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