WO2020200260A1 - 一种随机接入的方法、基站及用户设备 - Google Patents

一种随机接入的方法、基站及用户设备 Download PDF

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Publication number
WO2020200260A1
WO2020200260A1 PCT/CN2020/082879 CN2020082879W WO2020200260A1 WO 2020200260 A1 WO2020200260 A1 WO 2020200260A1 CN 2020082879 W CN2020082879 W CN 2020082879W WO 2020200260 A1 WO2020200260 A1 WO 2020200260A1
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Prior art keywords
response message
random access
message
base station
pusch
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PCT/CN2020/082879
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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 WO2020200260A1 publication Critical patent/WO2020200260A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H04W74/008—Transmission of channel access control information with additional processing of random access related information at receiving side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure

Definitions

  • This application relates to the field of wireless communication technology, and in particular to a random access method, base station and user equipment.
  • the random access process is mainly used for user equipment (UE) and base station (Base station, BS) to establish a wireless link to obtain/restore uplink synchronization. Due to the randomness of the user and the complexity of the wireless environment, the initiation of this access and the resources used are also random, which makes it possible for the terminal to establish a communication connection with the network.
  • UE user equipment
  • Base station Base station
  • This application discloses a random access method, which includes:
  • the base station After receiving the first random access message sent by the user equipment UE, the base station sends a random access response message to the UE, instructing the UE to perform random access; the first random access message includes a preamble sequence and an uplink sequence. At least one type of information in the load carried by the shared channel PUSCH;
  • the MAC PDU of the media access control protocol data unit of the random access response message includes any one of the first response message, the second response message, and the third response message or a combination of multiple message types, and each response message corresponds to One MAC PDU subunit;
  • the first response message is a response message when the base station correctly detects the preamble sequence but does not correctly detect the load carried by the PUSCH;
  • the second response message is a response message when the base station detects both the preamble sequence and the load carried by the PUSCH correctly;
  • the third response message is a response message when the base station correctly detects the preamble sequence but corresponds to no load carried by the PUSCH.
  • the application also discloses a base station, which includes a first receiving module, a first processing module, and a sending module;
  • the first receiving module is configured to receive the first random access message sent by the user equipment UE and send it to the first processing module; the first random access message includes the preamble sequence Preamble and the load carried by the uplink shared channel PUSCH At least one type of information in;
  • the first processing module is configured to generate a random access response message according to the first random access message, and send it to the sending module;
  • the MAC PDU of the random access response message contains the first Any one or a combination of multiple message types among the response message, the second response message, and the third response message, each response message corresponds to a MAC PDU subunit;
  • the first response message is a response message when the base station correctly detects the preamble sequence but does not correctly detect the load carried by the PUSCH;
  • the second response message is a response message when the base station detects both the preamble sequence and the load carried by the PUSCH correctly;
  • the third response message is a response message when the base station correctly detects the preamble sequence but corresponds to no load carried by the PUSCH;
  • the sending module is configured to send a random access response message to the UE.
  • the application also discloses a user equipment UE, which includes a second receiving module and a second processing module;
  • the second receiving module is configured to, after receiving the random access response message according to claim 8, detect whether to send the response message content corresponding to the first random access message for itself; the corresponding response message content includes : RAPID corresponding to the transmitted preamble sequence, and/or response message corresponding to the load carried by the transmitted PUSCH;
  • the second processing module includes
  • the second receiving module detects that the response message content corresponding to the first random access message sent by itself, including the RAPID corresponding to the sent preamble sequence, but corresponding to the response message corresponding to the load without PUSCH bearer, according to The system configures the random access retransmission mechanism to re-initiate random access;
  • the second receiving module Used when the second receiving module detects that the response message content corresponding to the first random access message sent by itself, including the RAPID corresponding to the sent preamble sequence and the response message corresponding to the load carried by the sent PUSCH, It is further judged according to the system configuration whether to feed back the confirmation information of correctly receiving the response message;
  • the second receiving module When the second receiving module does not receive the response message content corresponding to the first random access message sent by the second receiving module within the time window configured by the system to receive the response message, re-initiate random access according to the random access retransmission mechanism configured by the system. Into.
  • Figure 1 is a schematic flow diagram of an existing random access process.
  • Figure 2 is a schematic diagram of the format of an existing MAC PDU.
  • Figure 3A shows a schematic diagram of a system structure to which the random access method provided in this application is applicable.
  • Fig. 3B is a schematic flowchart of the random access method provided by this application.
  • Figure 4 is a schematic diagram of the base station structure provided by this application.
  • FIG. 5 is a schematic diagram of the first MAC subPDU format of the first response message according to an embodiment of the application.
  • FIG. 6 is a schematic diagram of the second MAC subPDU format of the first response message according to an embodiment of the application.
  • FIG. 7 is a schematic diagram of the MAC RAR in the MAC subPDU of the third first response message in an embodiment of the application.
  • FIG. 8 is a schematic diagram of a MAC PDU including a first response message and a third response message in a random access response message according to an embodiment of the application.
  • FIG. 9 is a schematic diagram of a MAC PDU including a first response message and a third response message in a random access response message according to another embodiment of the application.
  • FIG. 10 is a schematic diagram of a MAC PDU including a first response message, a second response message, and a third response message in a random access response message according to an embodiment of the application.
  • FIG. 11 is a schematic diagram of a MAC PDU including a first response message, a second response message, and a third response message in a random access response message according to another embodiment of the application.
  • Figure 12 is a schematic diagram of the user equipment structure provided by this application.
  • FIG. 13 is a schematic structural diagram of a computing device provided by an embodiment of this application.
  • the user equipment (UE) At least four signaling interactions are required with the base station (BS), as shown in Figure 1. Examples are as follows:
  • the first time the user equipment sends Msg1 to the base station, and Msg1 selects the preamble sequence for the user equipment for the base station to estimate the timing advance (TA), etc.;
  • Msg2 is the random access response of Msg1, which includes the preamble sequence identifier (RadomAccess Preamble Index, RAPID), TA, and the user equipment sends the uplink grant (Uplink Grant, UL) of Msg3 to the base station. Grant), Temporary Cell-RadioNetwork Temporary Identifier (TC-RNTI), etc.;
  • the third time the user equipment sends Msg3 to the base station.
  • the user equipment 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 Msg4 to the user equipment.
  • Msg4 is a response to resolve the contention conflict.
  • the Msg4 detected by the user equipment contains the relevant identification information in the corresponding Msg3, it is deemed that the random access is successful.
  • the random access response information includes Msg2 and Msg4.
  • Msg2 is a common information, that is, the base station includes the information of the Msg1 response sent by multiple UEs in a Medium Access Control Protocol Data Unit (Medium Access Control Protocol Data Unit). , MAC PDU), as shown in Figure 2:
  • MAC PDU includes multiple MAC PDU sub-units (MAC sub PDU).
  • the MAC PDU subunit can be one of three types: MAC sub PDU 1, MAC sub PDU 2, MAC sub PDU.
  • MAC sub PDU 1 (BI only, BI only), consists of five fields (E/T/R/R/BI).
  • MAC sub PDU 2 (RAPID only, RAPID only), consists of three fields (E/T/RAPID).
  • Each MAC sub PDU includes a sub-header composed of three fields (E/T/RAPID) and a payload (MAC RAR).
  • Each MAC RAR consists of four fields (R/Timing Advance Command/UL Grant/TC-RNTI).
  • the UE recognizes that the RAPID information in Msg2 corresponds to sending the MAC subPDU of the preamble sequence in Msg1 as its own response information.
  • Msg4 is the random access contention conflict response information, which contains the contention conflict resolution identifier
  • the generation of Msg4 is related to TC-RNTI or Cell-RadioNetworkTemporaryIdentifier (C-RNTI)
  • C-RNTI Cell-RadioNetworkTemporaryIdentifier
  • the UE uses TC-RNTI or C-RNTI performs Msg4 detection, and further determines whether Msg4 contains the common control channel service data unit CCCH SDU (Common Control Channel Service Data Unit) (the first 48 bits) sent in Msg3, that is, whether it matches the conflict resolution flag to determine whether it is The corresponding response information.
  • CCCH SDU Common Control Channel Service Data Unit
  • the random access process of the four-step random access channel based on the contention method at least four signaling interactions are required between the user equipment (UE) and the base station (BS).
  • the random access process can be achieved through at least two signaling interactions between the UE and the base station. It can be called a two-step random access channel 2-step RACH.
  • An example of the access process is as follows:
  • the first time UE sends MsgA to the base station and assumes the functions of Msg1 and Msg3 in 4-step RACH;
  • the second time the base station sends MsgB to the UE and assumes the functions of Msg2 and Msg4 in 4-step RACH, which are mainly used to indicate the TA of random access, C-RNTI allocation, authorization of uplink data transmission, and contention conflict resolution.
  • This application proposes a random access method that can generate MsgB through 2-step RACH, reduce signaling overhead, quickly respond to random access information to UEs using different random access methods, and reduce random access delay.
  • FIG. 3A shows a schematic diagram of a system structure to which a random access method according to some embodiments of the present application is applicable.
  • the system to which the random access method of the present application is applicable includes at least: user equipment 301 and base station 302.
  • the aforementioned user equipment 301 may refer to a smart device with data calculation and processing functions, including but not limited to smart phones (with communication modules installed), palmtop computers, tablet computers, and the like.
  • An operating system is installed on the user equipment 301, including but not limited to: Android operating system, Symbian operating system, Windows mobile operating system, Apple iPhone OS operating system, and so on.
  • the base station 302 which can also be called a “wireless base station” can also be used interchangeably with terms such as “evolvedNode Base station, eNB", “cell”, “sector”, “cell group”, “carrier”, and “component carrier”. Switch to use.
  • the base station may also be called by terms such as fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femto cell, and small cell.
  • the base station 302 can accommodate one or more (e.g., three) cells (also referred to as sectors). When the base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also pass through the base station subsystem (for example, indoor small base stations (RF remote heads (RRH, RemoteRadioHead))) to provide communication services.
  • RF remote heads RF remote heads
  • FIG. 3B is a schematic flowchart of the random access method proposed in this application. As shown in FIG. 3, the method includes the following steps:
  • Step S31 The user equipment (UE) sends a first random access message to the base station, where the first random access message includes at least one of a preamble sequence (Preamble) and a load carried by an uplink shared channel (Physical Uplink Shared CHannel, PUSCH) kind of information
  • Preamble a preamble sequence
  • PUSCH Physical Uplink Shared CHannel
  • Random access technology is an important technology for media access control in communication systems. Random access is triggered by a random access event, that is, when the UE meets the random access event trigger condition, the random access process is initiated.
  • the main random access trigger events include UE initial access, radio resource control (Radio Resource Control, RRC) connection reestablishment and handover, and uplink and downlink data attainment in an asynchronous state. Therefore, the message related to the event triggering the random access process contained in the random access message sent by the UE to the base station is the message related to the initial access of the UE, or the RRC connection reestablishment, or handover, etc.
  • the uplink shared channel PUSCH is carried.
  • the first random access message is also called MsgA, and includes the preamble sequence and the payload carried by the PUSCH.
  • the payload carried by the PUSCH corresponds to the one that triggers the random access process. Event-related messages.
  • the UE selects at least one of 2-stepRACH and 4-stepRACH to initiate random access according to the random access configuration and measurement results.
  • the first random access message includes a preamble sequence (Preamble).
  • the first random access message includes a preamble sequence (Preamble) and a load carried by the PUSCH.
  • Step S32 After receiving the first random access message sent by the user equipment, the base station sends a random access response message to the UE to instruct the UE to perform random access;
  • the media access control protocol data unit (MAC PDU) of the random access response message includes any one of the first response message, the second response message, and the third response message or a combination of multiple message types, and each response
  • the message corresponds to a MAC PDU sub-unit; among them, a MAC PDU sub-unit contains two parts: packet header and load.
  • the preamble sequence ID or random access retransmission fallback information is generally included in the sub-unit header part, and the MAC PDU sub-unit load part generally includes other response information indications, such as advance timing, uplink authorization, and temporary cell radio network temporary identification (Temporary Cell). -RadioNetworkTemporaryIdentifier, TC-RNTI) etc.
  • the first response message is a response message when the base station correctly detects the preamble sequence but does not correctly detect the load carried by the PUSCH;
  • the load in the MAC PDU subunit corresponding to the first response message includes: timing advance (Time Advance, TA), uplink grant information (Uplink Grant, UL Grant), one or a combination of the TC-RNTI field of the temporary cell radio network temporary identification; where the base station is based on the preamble sequence configured by the system and the load carried by the PUSCH Transmission resource mapping relationship, after the preamble sequence is correctly detected, the load carried by the PUSCH is further detected on the resource corresponding to the preamble sequence.
  • the improper detection of the load carried by the PUSCH includes that the MsgA PUSCH resource corresponding to the MsgA preamble sequence selected by the terminal is valid, the data is sent on the PUSCH but the base station does not receive it correctly, and the MsgA PUSCH resource corresponding to the MsgA preamble sequence selected by the terminal Invalid, the situation where the base station side cannot detect the data on the PUSCH when the PUSCH does not send data.
  • the second response message is a response message when the base station correctly detects the preamble sequence and the load carried by the PUSCH; the load in the MAC PDU subunit corresponding to the second response message includes: a response corresponding to the load carried by the PUSCH Message; the response message corresponding to the load carried by the PUSCH can be interpreted as whether the response message contains the contention conflict resolution identifier corresponding to the load carried by the PUSCH.
  • the message corresponding to the Msg3 load in Msg4 in traditional 4-step RACH is The contention conflict resolution identifier, which occupies 48 bits, corresponds to the CCCH SDU (first 48 bits) sent in Msg3.
  • the third response message is a response message when the base station correctly detects the preamble sequence but corresponds to no load carried by PUSCH; the load in the MAC PDU subunit corresponding to the third response message includes: TA, UL Grant, and TC -RNTI field.
  • the load corresponding to no PUSCH bearer means that the base station judges that the random access message sent by the UE device only includes the preamble sequence according to the random access configuration and the detected preamble sequence, and there is no load carried by the PUSCH, such as 4-step RACH situation Or according to the resource configured to send the load carried by the PUSCH corresponding to the preamble sequence and use energy detection to determine that no information is sent at the resource location (for example, 4-step RACH and 2-step RACH share preamble sequence and preamble sequence transmission resources happening).
  • the third response message corresponds to the UE using 4-step RACH to send the response information of the first random access message.
  • the MAC PDU subunit for different message types of the random access response message includes Distinguish the bits of each message type.
  • the load in the MAC PDU subunit corresponding to the first response message includes the timing advance information TA, the uplink grant information UL Grant, and the temporary cell radio network temporary identification TC-RNTI field, there is no need to The indicated field value is set to zero.
  • the two-step random access channel retransmission backoff indicator (Backoff Indicator: BI) in the MAC PDU of the random access response message and the four-step random access channel retransmission backoff indicator BI share the configuration or Independent configuration.
  • the MAC PDU of the random access response message includes the first retransmission back-off indication BI and the second retransmission
  • the back-off indicator BI contains bits for distinguishing different BIs in the MAC PDU subunits for different BIs;
  • the first BI is the two-step random access channel retransmission back-off indicator BI, which is used to indicate that the UE is in random access After the entry fails, the first BI is used to re-initiate the two-step random access;
  • the second BI is the four-step random access channel retransmission backoff indication BI, which is used to instruct the UE to apply the second BI after the random access fails Re-initiate four-step random access.
  • the MAC PDU of the random access response message includes a third retransmission back-off indication BI, and the third BI Used to instruct the UE to re-initiate two-step random access or four-step random access after random access fails.
  • This application generates MsgB, the MsgB includes any one of the first response message, the second response message, and the third response message or a combination of multiple message types, and each response message corresponds to a MAC PDU subunit;
  • the first response message is the response message when the base station detects the preamble sequence correctly, but the load carried by the PUSCH is not correctly detected;
  • the second response message is the response message when the base station detects both the preamble sequence and the load carried by the PUSCH correctly;
  • the third response message is a response message when the base station correctly detects the preamble sequence but corresponds to no load carried by the PUSCH.
  • the 2-step RACH random access response message design of this application can support 2-step RACH retransmission, support rapid response to random access information for UEs using different random access methods, reduce random access delay, and reduce random access delays. Different response information combinations reduce response information signaling overhead.
  • the present application also provides a base station.
  • a schematic structural diagram is shown in FIG. 4.
  • the base station includes a first receiving module 401, a first processing module 402, and a sending module 403;
  • the first receiving module 401 is configured to receive the first random access message sent by the user equipment UE and send it to the first processing module 402; the first random access message includes the preamble sequence Preamble and the uplink shared channel PUSCH bearer At least one type of information in the load;
  • the first processing module 402 is configured to generate a random access response message according to the first random access message, and send it to the sending module;
  • the MAC PDU of the random access response message contains Any one or a combination of multiple message types among the first response message, the second response message, and the third response message, each response message corresponds to a MAC PDU subunit;
  • the first response message is a response message when the base station correctly detects the preamble sequence but does not correctly detect the load carried by the PUSCH;
  • the second response message is a response message when the base station detects both the preamble sequence and the load carried by the PUSCH correctly;
  • the third response message is a response message when the base station correctly detects the preamble sequence but corresponds to no load carried by the PUSCH;
  • the sending module 403 is configured to send a random access response message to the UE.
  • the random access method provided by the embodiments of the present application is described through the following three features : the system configures the random access response message format and parameters, the random access retransmission mechanism, and the random access response message MAC PDU generation method.
  • the above 3) may further include a UE feedback response message that correctly detects the preamble sequence of MsgA and the load carried by PUSCH is not correctly detected, and the UE feedback response message that correctly detects the preamble sequence of MsgA and the load carried by the PUSCH.
  • MsgA and Msg1 correspond to application examples in which different random access modes are applied in the first random access message.
  • the first random access message corresponds to MsgA
  • the 4-step RACH is used to initiate random access
  • the first random access message corresponds to Msg1.
  • MsgA contains the preamble sequence and the load carried by PUSCH
  • Msg1 contains the preamble sequence.
  • This application corresponds to the response message for the correct detection of the preamble sequence for the 2-step RACH transmission of MsgA and the incorrect detection of the load carried by the PUSCH as the first response message; the preamble sequence for the transmission of MsgA and the PUSCH bearer for the 2-step RACH
  • the response message of correct load detection corresponds to the second response message; the response message Msg2 for 4-stepRACH Msg1 corresponds to the third response message.
  • the base station assembles the response messages of multiple UEs into a MAC PDU and sends it to the UE, the response message corresponding to the UE is a certain sub-unit (subPDU) of the MAC PDU.
  • the response message format includes preamble sequence ID (RAPID), TA indication, TC-RNTI indication, uplink authorization and other indications. Some of the information can be used as options, and the content of the information is determined according to the system configuration.
  • RAPID preamble sequence ID
  • TA indication indication
  • TC-RNTI indication indication
  • uplink authorization indications
  • Some of the information can be used as options, and the content of the information is determined according to the system configuration.
  • the format of the response message and the format of the MAC subPDU corresponding to the response message represent the same concept (same as below). Examples of response message formats, such as the following three:
  • the first type includes the preamble sequence ID (RAPID) and TA indication.
  • the schematic diagram of the response message format is shown in FIG. 5, which is a schematic diagram of the first MAC subPDU format of the first response message according to an embodiment of the application. Expressed as: subheader(E+T+RAPID)+Payload(TA).
  • the MAC subPDU includes a subheader and a payload, and the payload is the MAC RAR.
  • the "E” field in the subheader is used to indicate whether the subPDU is the last one
  • the "T” field is used to indicate whether it contains RAPID information
  • the "RAPID” indicates the preamble sequence ID
  • the "R” field in the payload field is reserved Bit
  • "TA” indicates timing advance information.
  • the second type: the first response message format includes the preamble sequence ID, TA and TC-RNTI indication.
  • the schematic diagram of the response message format is shown in FIG. 6, which is a schematic diagram of the MAC subPDU format of the second first response message according to the embodiment of the application.
  • TC-RNTI information is added to generate PUSCH during MsgA retransmission.
  • the third type the first response message format reuses the existing RACH response message format, where the payload part of the format MACsubPDU is shown in Figure 7, and the content not included in the response message is set to zero. For example, when the uplink authorization is not fed back, the content of the uplink authorization in the message format is set to zero. At this time, the length of the response message format is the same as the length of the existing RACH response message format.
  • FIG. 7 is a schematic diagram of the MAC RAR in the third first response message MAC subPDU according to an embodiment of the application. Expressed as: Payload (TA+UL GRANT+TC-RNTI).
  • the system when configuring the MAC subPDU that only contains the preamble sequence ID or the fallback indication, when random access response messages of different lengths are assembled into one MAC PDU, the system further configures the bit field in the response message MAC subPDU to indicate the The response message format to which the MAC subPDU belongs. For example, in Fig. 5, Fig. 6 or Fig. 7 further using reserved bits to indicate that the response message format to which the MAC subPDU belongs corresponds to a response message in which the MsgA preamble sequence in the 2-step RACH is correctly detected and the load carried by the PUSCH is not correctly detected. For another example, the T field in the subheader in the MAC subPDU is redesigned to indicate the response message format to which the MAC subPDU belongs.
  • the designed random access response message content corresponds to the trigger event, And it can include preamble sequence ID, TA, contention conflict resolution identification, TC-RNTI and other information. Part of the information is optional, and the specific information content is determined based on the system configuration and trigger events. For example, if the UE includes C-RNTI information in MsgA, the response message may not include TC-RNTI information.
  • the next retransmission can be configured to retransmit only the load carried by PUSCH.
  • the next MsgA retransmission when the UE detects the first response message corresponding to the MsgA, the next MsgA retransmission only retransmits the load carried by the PUSCH when the MsgA does not exceed the maximum number of retransmissions.
  • the response message can be configured to include TC-RNTI information, and the load carried by the retransmitted PUSCH is generated based on the TC-RNTI in the response message.
  • the base station may configure retransmission timing information to indicate the time for the UE to retransmit the load carried by the PUSCH next time, where the retransmission timing information may be included in the response message to indicate, or the base station may notify the configuration information through RRC configuration UE.
  • the above configuration information 1), 2), and 3) may be included in the 2-step RACH configuration information in RRC signaling and notified to the UE by the base station; or included in the physical downlink control channel (PDCCH) by The base station notifies the UE; or writes it into the base station and the UE through device configuration.
  • PDCCH physical downlink control channel
  • the above 2-step RACH retransmission is the re-initiation of random access.
  • the UE that is using 2-step RACH to initiate random access can include the following 4 types of random access re-initiation: -step RACH initiates the retransmission of the preamble sequence of MsgA and the load carried by PUSCH, the second is to use 2-step RACH to initiate the retransmission of the load carried by PUSCH only, and the third is to fall back to 4-step RACH to initiate the transmission of Msg1 , The fourth is to fall back to 4-step RACH to initiate Msg3 transmission.
  • the system configures the random access response message MAC PDU generation method. This method reflects the multiplexing relationship between 2-step RACH and 4-step RACH response messages. According to the random access response message MAC PDU generation mode, it is determined whether the random access response message for the 2-step RACH MsgA and the 4-step RACH response message Msg2 are assembled into one MAC PDU. One or more of the first response message, the second response message, and the third response message are assembled into a MAC PDU format. Examples are as follows:
  • the first response message and the third response message are assembled into one MAC PDU
  • the MAC subPDU in the RACH response message MAC PDU fed back by the base station includes the following types:
  • MAC subPDU3 represents the third response message, the subheader indicates the preamble sequence ID, and the load indicates TA, TC-RNTI, and uplink authorization.
  • the schematic diagram of the load is shown in Figure 7.
  • MAC subPDU4 represents the first response message
  • MAC subPDU4 may further include multiple response message formats to support the inclusion of different response message contents, for example, include one format or multiple formats of the above-mentioned Figure 5, Figure 6, and Figure 7.
  • the format type becomes the first three.
  • the MAC PDU may contain certain zero-padded bits according to the size of the transmission packet, that is, padding as shown in Figure 8.
  • FIG. 8 is a schematic diagram of a MAC PDU including a first response message and a third response message in a random access response message according to an embodiment of the application. Among them, “MAC subPDU1" only indicates BI. "MAC subPDU2" is an indication that only indicates the preamble sequence ID.
  • RAPID+RAR of "MAC subPDU3" is the sub-header indicating the preamble sequence ID, the load indicating TA, TC-RNTI, and uplink authorization.
  • 2-step RACH MAC RAR type1 is a schematic representation of the payload part of the first response message MAC subPDU.
  • the MAC subPDU in the RACH response message MAC PDU fed back by the base station includes the following types:
  • MAC subPDU4 represents the third response message, the subheader indicates the preamble sequence ID, and the load indicates TA, TC-RNTI, and uplink authorization.
  • the schematic diagram of the load is shown in Figure 7.
  • MAC subPDU5 represents the first response message
  • the above 5) may further include multiple response message formats to support the inclusion of different response message contents, for example, including one format or multiple formats of the above-mentioned Figure 5, Figure 6, and Figure 7.
  • the MAC PDU may contain certain zero-padded bits according to the size of the transmission packet, that is, padding as shown in Figure 9.
  • FIG. 9 is a schematic diagram of a MAC PDU including a first response message and a third response message in a random access response message according to another embodiment of the application. Among them, “MAC subPDU1" only indicates the BI signal for 4-step RACH. "MAC subPDU2" only indicates the BI signal for 2-step RACH.
  • bits other than the bits occupied by the header "BI” need to be used to indicate that the BI information belongs to 4-step RACH UE's fallback indication or 2-step RACH UE's fallback indication, for example, one of the reserved bits "R” is designed as a new indication field, and the value is 1 to indicate that the "BI" belongs to the 2-step RACH UE response.
  • a value of "0" indicates that the "BI” belongs to a 4-step RACH UE response; or a value of 0 indicates that the "BI” belongs to a 2-step RACH UE response, and a value of "1" indicates that the "BI” belongs to 4 -step UE response to RACH.
  • the MAC subPDU format in the RACH response message MAC PDU fed back by the base station includes the following types:
  • MAC subPDU3 represents the third response message, the subheader indicates the preamble sequence ID, and the load indicates TA, TC-RNTI, and uplink authorization.
  • the schematic diagram of the load is shown in Figure 7.
  • MAC subPDU4 represents the first response message
  • MAC subPDU5 represents the second response message
  • the above 4) may further include multiple response message formats to support the inclusion of different response message contents, for example, including one format or multiple formats of the above-mentioned Figure 5, Figure 6, and Figure 7.
  • the above 5) may further include multiple response message formats according to the system configuration, so as to meet the requirements of different trigger event response message content.
  • the MAC PDU may include certain zero-padded bits according to the size of the transmission packet, that is, padding as shown in FIG. 10.
  • FIG. 10 is a schematic diagram of a MAC PDU including a first response message, a second response message, and a third response message in a random access response message according to an embodiment of the application.
  • “2-step RACH MAC RAR type1" is a schematic representation of the payload part of the first response message MAC subPDU.
  • “2-step RACH MAC RAR type2" is the payload part of the second response message MAC subPDU.
  • the MAC subPDU format in the RACH response message MAC PDU fed back by the base station includes the following types:
  • MAC subPDU4 represents the third response message, the subheader indicates the preamble sequence ID, and the load indicates TA, TC-RNTI, and uplink authorization.
  • the schematic diagram of the load is shown in Figure 7.
  • MAC subPDU5 represents the first response message
  • the above 5) may further include multiple response message formats to support the inclusion of different response message contents, for example, including one format or multiple formats of the above-mentioned Figure 5, Figure 6, and Figure 7.
  • the above 6) may further include multiple response message formats according to the system configuration to meet the needs of different trigger event response message content.
  • the MAC PDU may contain certain zero-padded bits according to the size of the transmission packet, that is, padding as shown in Figure 11.
  • FIG. 11 is a schematic diagram of a MAC PDU including a first response message, a second response message, and a third response message in a random access response message according to another embodiment of the application.
  • the bits other than the bytes occupied by the header "BI” need to be used to indicate that the BI information belongs to the 4-step RACHUE Back-off indication or 2-step RACH UE back-off indication, for example, one of the reserved bits "R” is designed as a new indication field, the value is 1 to indicate that the "BI” belongs to the 2-step RACH UE response, and the value is " 0" indicates that the "BI” belongs to a 4-step RACH UE response; or a value of 0 indicates that the "BI” belongs to a 2-step RACH UE response, and a value of "1” indicates that the "BI” belongs to a 4-step RACH The UE responds.
  • the first response message and the second response message are assembled into one MAC PDU.
  • the MAC PDU and the 4-step RACH response message are independent of each other.
  • the MAC subPDU in the 2-step RACH response message MAC PDU fed back by the base station includes the following types:
  • MAC subPDU3 represents the first response message
  • MAC subPDU4 represents the second response message
  • the above 3) may further include multiple response message formats to support the inclusion of different response message contents, such as including one format or multiple formats of the above-mentioned Figure 5, Figure 6, and Figure 7.
  • the above 4) may further include multiple response message formats according to the system configuration to meet the requirements of different trigger event response message content.
  • MAC PDU may contain certain zero-padded bits according to the size of the transmission packet.
  • the first response message is assembled into a MAC PDU.
  • the MAC PDU and the 4-step RACH response message are independent of each other.
  • the MAC subPDU in the MAC PDU assembled by the first response message fed back by the base station includes the following types:
  • MAC subPDU3 represents the first response message
  • MAC PDU may contain certain zero-padded bits according to the size of the transmission packet.
  • system configuration of the multiplexing relationship between the 2-step RACH and 4-step RACH response messages and the 2-step RACH response message design can be embodied in the MAC PDU design of the RACH response message, or configured through high-level signaling.
  • the system determines the format and parameters of the MAC PDU of the 2-step RACH response message through the design of the MAC PDU format or high-level configuration.
  • one or more bits are configured in the sub-unit (subPDU) format corresponding to the response message to indicate the message type.
  • the system can configure one or more bits in the first response message The field indicates that the response message corresponding to the subPDU belongs to the first response message of the 2-step RACH.
  • the system may configure one or more bit fields in the third response message to indicate that the response message corresponding to the subPDU belongs to the third response message.
  • the system configuration distinguishes the unit format type through random access related identifiers.
  • the terminal can identify the information format to which the currently detected MAC subPDU belongs according to the random access related identifier, there is no need to configure one or more bit fields in the response message in the response message format to indicate the response message format to which the MAC subPDU belongs.
  • the terminal can determine the currently detected MAC subPDU by identifying the preamble sequence ID Whether the information format it belongs to is the 4-stepRACH response message format.
  • the method for generating the response message MAC PDU may be included in the configuration information about random access in RRC signaling and notified to the UE by the base station; or included in the PDCCH and notified to the UE by the base station; or through the device The configuration is written in the base station and UE.
  • the base station feeds back the RACH response message to the UE
  • the above 3) may further include a UE feedback response message that correctly detects the preamble sequence of MsgA and the load carried by PUSCH is not correctly detected, and the UE feedback response message that correctly detects the preamble sequence of MsgA and the load carried by the PUSCH.
  • the base station generates a response message according to the system configuration, and sends the response message to the UE.
  • the random access response message of this application can support multiple 2-step RACH retransmissions. specifically,
  • the UE After receiving the random access response message, the UE detects whether to send the response message content corresponding to the first random access message for itself; the corresponding response message content includes: RAPID corresponding to the sent preamble sequence, And/or, a response message corresponding to the load carried by the transmitted PUSCH;
  • Case 1 If the response message content corresponding to the first random access message sent by itself includes the RAPID corresponding to the sent preamble sequence, but there is no response message corresponding to the load carried by the sent PUSCH, the corresponding message is
  • the base station correctly detects the preamble sequence, but the load carried by PUSCH is not correctly detected, or when the UE uses 4-step RACH or 2-step RACH to initiate random access, the base station only detects The situation of the correct detection of the leading sequence;
  • Case 2 If the content of the response message corresponding to the first random access message sent by itself includes the RAPID corresponding to the sent preamble sequence and the response message corresponding to the load carried by the sent PUSCH, the corresponding message is used by the UE When the 2-stepRACH initiates random access, the base station correctly detects the preamble sequence and the load carried by the PUSCH;
  • Case 3 If the response message content corresponding to the first random access message is not sent by itself, for example, after the UE sends MsgA, it waits to receive the response in the response timing window configured by the system. When the response timing expires, the UE does not receive it. Any response information content corresponding to the MsgA sent by itself corresponds to the situation where the base station fails to correctly detect the preamble sequence and the load carried by PUSCH when the UE initiates random access using 2-stepRACH, or the UE uses 4-stepRACH to initiate random access. The case where the incoming base station does not correctly detect the preamble sequence, or the case where the UE sends a response message corresponding to the first random access message sent by the base station to the base station.
  • the UE determines whether to re-initiate random access or to send a second random access message according to the system random access configuration and response information detection result;
  • UE re-initiates random access according to the system configuration random access retransmission mechanism
  • the UE that is using 2-step RACH to initiate random access includes four types of random access re-initiation: the first is to use 2-step RACH to initiate the MsgA preamble sequence and the load retransmission carried by PUSCH, and the second is The 2-step RACH is used to only initiate the retransmission of the load carried by the PUSCH. The third is to fall back to 4-step RACH to initiate Msg1 transmission, and the fourth is to fall back to 4-step RACH to initiate Msg3 transmission.
  • the UE selects one of the above methods to initiate MsgA retransmission according to the system configuration and the detection result.
  • the UE determines according to the system configuration that the received response information content is to send the response information content corresponding to the MsgA for itself. If the content of the corresponding response information contains an uplink authorization, then use the uplink authorization to fall back to 4-step RACH to send msg3 (choose the fourth type above). If the uplink authorization is not included, select one of the above-mentioned first, second, or third methods to initiate MsgA retransmission according to the system configuration. If the content of the corresponding response information contains TA information, the sending timing is adjusted according to the TA in the next information transmission.
  • the UE that is using 4-step RACH to initiate random access includes two types of random access re-initiation and one type of second random access message sending: the first is to use 2-step RACH to initiate MsgA preamble sequence and Load retransmission carried by PUSCH; the second is to use 4-step RACH to initiate Msg1 transmission.
  • the sending of the second random access message means using a 4-step RACH to initiate Msg3 transmission.
  • the second random access message is Msg3.
  • the UE when the UE initiates random access by using the 2-step RACH, select the preamble sequence and related transmission resources according to the related configuration of the 2-step RACH, and generate the corresponding random access message.
  • the UE uses 4-step RACH to initiate random access, it selects the preamble sequence and related transmission resources according to the related configuration of 4-step RACH, and generates corresponding random access messages.
  • the UE further determines whether to feed back the confirmation information for correctly receiving the response message; for example, feed back ACK or NACK information. If the content of the corresponding response information contains TA information, the sending timing is adjusted according to the TA in the next information transmission.
  • the UE When the UE does not receive the response message content corresponding to the first random access message sent by itself within the time window when the UE receives the response message, the UE re-initiates random access according to the random access retransmission mechanism configured by the system.
  • the UE that is using 2-step RACH to initiate random access includes four types of random access: the first is to use 2-step RACH to initiate the MsgA preamble sequence and the load retransmission carried by PUSCH, and the second is to use 2- Step RACH only initiates the retransmission of the load carried by PUSCH.
  • the third type is to fall back to 4-step RACH to initiate Msg1 transmission
  • the fourth type is to fall back to 4-step RACH to initiate Msg3 transmission.
  • the retransmission of MsgA is in the first and third options.
  • the present application also provides a user equipment UE.
  • a schematic structural diagram is shown in FIG. 12.
  • the UE includes a second receiving module 1201 and a second processing module 1202;
  • the second receiving module 1201 is configured to detect whether the response message content corresponding to the first random access message is sent for itself after receiving the random access response message; the corresponding response message content includes: and the sent preamble The RAPID corresponding to the sequence and/or the response message corresponding to the load carried by the transmitted PUSCH;
  • the second processing module 1202 is the second processing module 1202
  • the second receiving module 1201 Used when the second receiving module 1201 detects that the response message content corresponding to the first random access message sent by the second receiving module 1201 includes the RAPID corresponding to the sent preamble sequence, but corresponds to the response message corresponding to the load without PUSCH bearer, And re-initiate random access or send a second random access message according to the system configuration random access retransmission mechanism;
  • the second receiving module 1201 Used when the second receiving module 1201 detects that it sends the response message content corresponding to the first random access message, including the RAPID corresponding to the sent preamble sequence and the response message corresponding to the load carried by the sent PUSCH , According to the system configuration, it is further judged whether to feedback the confirmation information of correctly receiving the response message;
  • the second receiving module 1201 does not receive the response message content corresponding to the first random access message sent by itself within the time window for receiving the response message configured by the system, and the UE re-initiates the random access retransmission mechanism according to the system configuration. Access.
  • the random access method, base station, and user equipment provided in this application can have the following advantages:
  • the random access response message of this application assembles 2-step RACH response information and 4-step RACH response information into one MAC PDU.
  • the random access response message of this application can support multiple retransmissions of 2-step RACH.
  • FIG. 13 is a schematic structural diagram of a computing device provided by an embodiment of this application.
  • the computing device can be a user equipment or a base station. As shown in FIG. 13, the computing device includes a power supply, various types of housings and other structures.
  • the computing device may also include: at least one processor 1301, an input interface 1302, an output interface 1303, and a memory 1304.
  • the input interface 1302 may be some network interface or user interface. Through the input interface 1302, the audio training file or the audio file to be classified can be downloaded from the network, or the audio training file or the audio file to be classified input by the user can be received. file.
  • the output interface 1303 may also be some display interface such as a network interface or a display screen, which can output or display the classification result or the classified audio file to the user.
  • the memory 1304 may include volatile memory (volatile memory), such as random-access memory (RAM); the memory 1304 may also include non-volatile memory (non-volatile memory), such as flash memory (flash memory), solid-state drive (solid-state drive, SSD), etc.; the memory 1304 may also include a combination of the foregoing types of memories.
  • volatile memory volatile memory
  • non-volatile memory non-volatile memory
  • flash memory flash memory
  • solid-state drive solid-state drive
  • SSD solid-state drive
  • the processor 1301 may be a central processing unit (CPU). In an embodiment, the processor 1301 may further include a hardware chip.
  • the aforementioned hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), etc.
  • ASIC application-specific integrated circuit
  • PLD programmable logic device
  • the above-mentioned PLD may be a field-programmable gate array (FPGA), a generic array logic (GAL), etc.
  • the memory 1304 is also used to store program instructions.
  • the processor 1301 can call the program instructions to implement the various methods and steps mentioned above.
  • the program can be stored in a computer readable storage medium. During execution, it may include the procedures of the above-mentioned method embodiments.
  • the storage medium may be a magnetic disk, an optical disc, a read-only memory (Read-Only Memory, ROM), or a random access memory (Random Access Memory, RAM), etc.

Abstract

本申请提供了一种随机接入的方法、基站及用户设备UE，该方法包括：基站接收到UE发送的第一随机接入消息后，向所述UE发送随机接入响应消息；所述随机接入响应消息的MAC PDU包含第一响应消息、第二响应消息和第三响应消息中的任意一种或者多种消息类型的组合，每种响应消息对应一个MAC PDU子单元；所述第一响应消息为基站对前导序列正确检测，但对PUSCH承载的负载未正确检测时的响应消息；所述第二响应消息为基站对前导序列和PUSCH承载的负载都正确检测时的响应消息；所述第三响应消息为基站对前导序列正确检测，但对应无PUSCH承载的负载时的响应消息。

Description

一种随机接入的方法、基站及用户设备
本申请要求于2019年4月4日提交中国专利局、申请号为201910270192.0、名称为“一种随机接入的方法、基站及用户设备”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
本申请涉及无线通信技术领域，特别涉及一种随机接入的方法、基站及用户设备。
背景
随机接入流程主要用于用户设备(User equipment，UE)和基站(Base station，BS)建立无线链路，获取/恢复上行同步。由于用户的随机性、无线环境的复杂性决定了这种接入的发起及采用的资源也具有随机性，它使终端与网络建立通信连接成为可能。
技术内容
本申请公开了一种随机接入的方法，该方法包括：
基站接收到用户设备UE发送的第一随机接入消息后，向所述UE发送随机接入响应消息，指示所述UE进行随机接入；所述第一随机接入消息包含前导序列Preamble和上行共享信道PUSCH承载的负载中至少一种信息；
所述随机接入响应消息的媒体接入控制协议数据单元MAC PDU包含第一响应消息、第二响应消息和第三响应消息中的任意一种或者多种消息类型的组合，每种响应消息对应一个MAC PDU子单元；
所述第一响应消息为基站对前导序列正确检测，但对PUSCH承 载的负载未正确检测时的响应消息；
所述第二响应消息为基站对前导序列和PUSCH承载的负载都正确检测时的响应消息；
所述第三响应消息为基站对前导序列正确检测，但对应无PUSCH承载的负载时的响应消息。
本申请还公开了一种基站，所述基站包括第一接收模块、第一处理模块和发送模块；
所述第一接收模块，用于接收用户设备UE发送的第一随机接入消息，并发送给第一处理模块；所述第一随机接入消息包含前导序列Preamble和上行共享信道PUSCH承载的负载中至少一种信息；
所述第一处理模块，用于根据所述第一随机接入消息生成随机接入响应消息，并发送给发送模块；所述随机接入响应消息的媒体接入控制协议数据单元MAC PDU包含第一响应消息、第二响应消息和第三响应消息中的任意一种或者多种消息类型的组合，每种响应消息对应一个MAC PDU子单元；
所述第一响应消息为基站对前导序列正确检测，但对PUSCH承载的负载未正确检测时的响应消息；
所述第二响应消息为基站对前导序列和PUSCH承载的负载都正确检测时的响应消息；
所述第三响应消息为基站对前导序列正确检测，但对应无PUSCH承载的负载时的响应消息；
所述发送模块，用于向所述UE发送随机接入响应消息。
本申请还公开了一种用户设备UE，所述UE包括第二接收模块和第二处理模块；
所述第二接收模块，用于接收到如权利要求8所述的随机接入响 应消息后，检测是否为自身发送第一随机接入消息对应的响应消息内容；所述对应的响应消息内容包括：与已发送的前导序列对应的RAPID，和/或，与已发送的PUSCH承载的负载对应的响应消息；
所述第二处理模块，
用于在第二接收模块检测出是自身发送第一随机接入消息对应的响应消息内容，其中包括与已发送的前导序列对应的RAPID，但对应无PUSCH承载的负载对应的响应消息时，根据系统配置随机接入重传机制重新发起随机接入；
用于在第二接收模块检测出是自身发送第一随机接入消息对应的响应消息内容，其中包括与已发送的前导序列对应的RAPID以及与已发送的PUSCH承载的负载对应的响应消息时，进一步根据系统配置判断是否反馈正确接收响应消息的确认信息；
用于在第二接收模块在系统配置的接收响应消息的时间窗内未接收到与自身发送第一随机接入消息对应的响应消息内容时，根据系统配置随机接入重传机制重新发起随机接入。
附图说明
图1为现有随机接入过程的流程示意图。
图2为现有MAC PDU的格式示意图。
图3A显示了本申请提供的随机接入方法所适用的系统结构示意图。
图3B为本申请提供的随机接入方法的流程示意图。
图4为本申请提供的基站结构示意图。
图5为本申请实施例第一种第一响应消息MAC subPDU格式的示意图。
图6为本申请实施例第二种第一响应消息MAC subPDU格式的示意图。
图7为本申请实施例第三种第一响应消息MAC subPDU中的MAC RAR示意图。
图8为本申请实施例随机接入响应消息中包括第一响应消息和第三响应消息的MAC PDU的示意图。
图9为本申请另一实施例随机接入响应消息中包括第一响应消息和第三响应消息的MAC PDU的示意图。
图10为本申请实施例随机接入响应消息中包括第一响应消息、第二响应消息和第三响应消息的MAC PDU的示意图。
图11为本申请另一实施例随机接入响应消息中包括第一响应消息、第二响应消息和第三响应消息的MAC PDU的示意图。
图12为本申请提供的用户设备结构示意图；
图13为本申请实施例提供的一种计算设备的结构示意图。
实施方式
在为使本申请的目的、技术方案、及优点更加清楚明白，以下参照附图并举实施例，对本申请进一步详细说明。
在一些实施例中，随着在现有4G和5G定义的基于竞争方式的四步随机接入信道(4-step Random Access Channel，4-step RACH)的随机接入过程，用户设备(UE)和基站(BS)之间至少需要进行四次信令的交互，如图1所示，示例如下：
第一次：用户设备向基站发送Msg1，Msg1为用户设备选择前导序列，用于基站进行定时提前量(Time Advance，TA)估计等；
第二次：基站向用户设备发送Msg2，Msg2为Msg1的随机接入 响应，其中包含了前导序列标识(RadomAccess Preamble Index，RAPID)、TA、用户设备向基站发送Msg3的上行授权(Uplink Grant，UL Grant)、临时小区无线网络临时标识(Temporary Cell-RadioNetworkTemporaryIdentifier，TC-RNTI)等；
第三次：用户设备向基站发送Msg3，当用户设备在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：基站向用户设备发送Msg4，Msg4为解决竞争冲突的响应，当用户设备检测到的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。
目前随机接入响应信息包含Msg2和Msg4两种，其中Msg2为一个公用信息，即基站将针对多个UE发送的Msg1响应的信息包含在一个媒体接入控制协议数据单元(Medium Access Control Protocol Data Unit，MAC PDU)中发生，如图2所示：
MAC PDU包含多个MAC PDU子单元(MAC sub PDU)。其中MAC PDU子单元可以为MAC sub PDU 1、MAC sub PDU 2、MAC sub PDU 3三种类型中的一种。MAC sub PDU 1(仅BI，BI only)，由五个字段组成(E/T/R/R/BI)。MAC sub PDU 2(仅RAPID，RAPID only)，由三个字段组成(E/T/RAPID)。MAC sub PDU 3，每个MAC sub PDU包括由三个字段(E/T/RAPID)组成的子头和负载(MAC RAR)。每个MAC RAR由四个字段组成(R/Timing Advance Command/UL Grant/TC-RNTI)。
UE通过识别Msg2中的RAPID信息对应为发送Msg1中的前导序列的MACsubPDU为自己的响应信息。而对于Msg4为随机接入竞争冲突响应信息，其中包含了竞争冲突解决标识，Msg4的生成与 TC-RNTI或者小区无线网络临时标(Cell-RadioNetworkTemporaryIdentifier，C-RNTI)相关，UE通过TC-RNTI或者C-RNTI进行Msg4检测，并进一步判断Msg4中是否包含Msg3中发送的公共控制信道业务数据单元CCCH SDU(Common Control Channel Service Data Unit)(前48bit)是否匹配，即竞争解决冲突标识以判断是否是其对应的响应信息。
根据上述描述可以看出，基于竞争方式的四步随机接入信道的随机接入过程，用户设备(UE)和基站(BS)之间至少需要进行四次信令的交互。
为了降低信令开销和随机接入时延，随机接入过程通过UE和基站之间至少两次信令的交互即可实现，可以称之为两步随机接入信道2-step RACH，其随机接入过程示例如下：
第一次：UE向基站发送MsgA，承担4-step RACH中Msg1和Msg3的功能；
第二次：基站向UE发送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、C-RNTI分配、上行数据传输的授权以及竞争冲突解决等。
本申请提出一种随机接入方法，能够通过2-step RACH生成MsgB，降低信令开销，快速对采用不同随机接入方法的UE响应随机接入信息，降低随机接入时延。
图3A显示了本申请一些实施例所述的一种随机接入方法所适用的系统结构示意图。如图3A所示，本申请的随机接入方法所适用的系统至少包括：用户设备301以及基站302。
在本申请的一些实例中，上述用户设备301可以是指具有数据计算处理功能的智能设备，包括但不限于(安装有通信模块的)智能手 机、掌上电脑、平板电脑等。用户设备301上安装有操作系统，包括但不限于：Android操作系统、Symbian操作系统、Windows mobile操作系统、以及苹果iPhone OS操作系统等等。
基站302，又可以称为“无线基站”，还可以与“evolvedNode Base station，eNB”、“小区”、“扇区”、“小区组”、“载波”以及“分量载波”这样的用语可以互换使用。基站有时也以固定台(fixedstation)、NodeB、eNodeB(eNB)、接入点(accesspoint)、发送点、接收点、毫微微小区、小小区等用语来称呼。
基站302可以容纳一个或多个(例如三个)小区(也称为扇区)。当基站容纳多个小区时，基站的整个覆盖区域可以划分为多个更小的区域，每个更小的区域也可以通过基站子系统(例如，室内用小型基站(射频拉远头(RRH，RemoteRadioHead)))来提供通信服务。“小区”或“扇区”这样的用语是指在该覆盖中进行通信服务的基站和/或基站子系统的覆盖区域的一部分或整体。
基于上述图3A所示的系统结构，本申请的一个实施例提供了一种随机接入方法，由基站302执行。图3B为本申请提出的随机接入的方法的流程示意图，如图3所示，该方法包括以下步骤：
步骤S31、用户设备(UE)向基站发送第一随机接入消息，所述第一随机接入消息包含前导序列(Preamble)和上行共享信道(Physical Uplink Shared CHannel,PUSCH)承载的负载中至少一种信息；
随机接入技术是通信系统中媒体接入控制的一项重要技术。随机接入由随机接入事件触发发起，即当UE满足随机接入事件触发条件时，则发起随机接入过程。主要随机接入触发事件包括UE的初始接入、无线资源控制(Radio Resource Control，RRC)连接重建和切换、 非同步状态下上下行数据达到等目的。因此，UE向基站发送的所述随机接入消息中包含的所述与触发随机接入过程的事件相关的消息就是与UE的初始接入，或者RRC连接重建，或者切换等相关的消息，由上行共享信道PUSCH承载。在2-step RACH中所述第一随机接入消息也称作MsgA，包括前导序列和PUSCH承载的负载(payload)，其中PUSCH承载的负载(payload)对应为所述与触发随机接入过程的事件相关的消息。
进一步地，当满足随机接入事件触发条件时，UE根据随机接入配置和测量结果，选择2-stepRACH和4-stepRACH中至少一种方式发起随机接入。当UE采用4-step RACH发起随机接入时，所述第一随机接入消息包括前导序列(Preamble)。当UE采用2-step RACH发起随机接入时，所述第一随机接入消息包括前导序列(Preamble)和PUSCH承载的负载。
步骤S32、基站接收到用户设备发送的第一随机接入消息后，向所述UE发送随机接入响应消息，指示所述UE进行随机接入；
所述随机接入响应消息的媒体接入控制协议数据单元(MAC PDU)包含第一响应消息、第二响应消息和第三响应消息中的任意一种或者多种消息类型的组合，每种响应消息对应一个MAC PDU子单元；其中，一个MAC PDU子单元包含包头和负载两部分。对于前导序列ID或者随机接入重传回退信息一般包含在子单元包头部分，MAC PDU子单元负载部分一般包含其他响应信息指示，例如提前定时、上行授权、临时小区无线网络临时标识(Temporary Cell-RadioNetworkTemporaryIdentifier，TC-RNTI)等。
所述第一响应消息为基站对前导序列正确检测，但对PUSCH承载的负载未正确检测时的响应消息；所述第一响应消息对应的MAC  PDU子单元中的负载包括：定时提前量(Time Advance，TA)，上行授权信息(Uplink Grant，UL Grant)，临时小区无线网络临时标识TC-RNTI字段的一种或者几种的组合；其中基站根据系统配置的前导序列与PUSCH承载的负载所在的传输资源映射关系，在前导序列正确检测后进一步在与前导序列对应的资源上检测PUSCH承载的负载。所述PUSCH承载的负载未正确检测包括了终端选择的MsgA前导序列对应的MsgA PUSCH资源有效，在PUSCH上发送了数据但是基站未正确接收的情况，以及终端选择的MsgA前导序列对应的MsgA PUSCH资源无效，在PUSCH未发送数据基站侧无法检测到该PUSCH上的数据的情况。
所述第二响应消息为基站对前导序列和PUSCH承载的负载都正确检测时的响应消息；所述第二响应消息对应的MAC PDU子单元中的负载中包括：与PUSCH承载的负载对应的响应消息；其中与PUSCH承载的负载对应的响应消息可以对应解释为响应消息中是否包含与PUSCH承载的负载对应的竞争冲突解决标识，如传统4-step RACH中Msg4中与Msg3负载对应的消息即为竞争冲突解决标识，该标识占用48bit，对应为Msg3中发送的CCCH SDU(前48bit)。
所述第三响应消息为基站对前导序列正确检测，但对应无PUSCH承载的负载时的响应消息；所述第三响应消息对应的MAC PDU子单元中的负载中包括：TA，UL Grant和TC-RNTI字段。其中所述对应无PUSCH承载的负载表示基站根据随机接入配置，根据检测的前导序列判断UE设备发送的所述随机接入消息仅包括前导序列，无PUSCH承载的负载，例如4-step RACH情况；或者根据配置在前导序列对应的发送PUSCH承载的负载的资源上利用能量检测等方式判定该资源位置上无信息发送(例如4-step RACH和2-step RACH共享 前导序列和前导序列发送资源的情况)。第三响应消息在应用中对应为UE采用4-step RACH发送第一随机接入消息的响应信息。
在一些实施例中，为区分各种消息类型的第一响应消息、第二响应消息和第三响应消息，所述随机接入响应消息的针对不同消息类型的MAC PDU子单元中，包含用于区分各消息类型的比特。
在一些实施例中，当所述第一响应消息对应的MAC PDU子单元中的负载中包括定时提前信息TA，上行授权信息UL Grant和临时小区无线网络临时标识TC-RNTI字段时，将其中无需指示的字段值置零。
在一些实施例中，所述随机接入响应消息的MAC PDU中两步随机接入信道重传回退指示(Backoff Indicator：BI)和四步随机接入信道重传回退指示BI共用配置或者相互独立配置。
具体地，当2-step RACH和4-step RACH配置相互独立的重传回退计时机制时，所述随机接入响应消息的MAC PDU中包含第一重传回退指示BI和第二重传回退指示BI，在针对不同BI的MAC PDU子单元中包含用于区分不同BI的比特；所述第一BI为两步随机接入信道重传回退指示BI，用于指示UE在随机接入失败后应用该第一BI重新发起两步随机接入；所述第二BI为四步随机接入信道重传回退指示BI，用于指示UE在随机接入失败后应用该第二BI重新发起四步随机接入。
具体地，当2-step RACH和4-step RACH共用相同的重传回退计时机制时，所述随机接入响应消息的MAC PDU中包含第三重传回退指示BI，所述第三BI用于指示UE在随机接入失败后重新发起两步随机接入或者四步随机接入。
本申请通过生成MsgB，所述MsgB包括第一响应消息、第二响应 消息和第三响应消息中的任意一种或者多种消息类型的组合，每种响应消息对应一个MAC PDU子单元；所述第一响应消息为基站对前导序列正确检测，但对PUSCH承载的负载未正确检测时的响应消息；所述第二响应消息为基站对前导序列和PUSCH承载的负载都正确检测时的响应消息；所述第三响应消息为基站对前导序列正确检测，但对应无PUSCH承载的负载时的响应消息。本申请的2-step RACH的随机接入响应消息设计可以支持2-step RACH重传、支持对采用不同随机接入方法的UE快速响应随机接入信息，降低随机接入时延，并且通过将不同响应信息组合降低响应信息信令开销。
基于相同的发明构思，本申请还提供了一种基站，结构示意图如图4所示，所述基站包括第一接收模块401、第一处理模块402和发送模块403；
所述第一接收模块401，用于接收用户设备UE发送的第一随机接入消息，并发送给第一处理模块402；所述第一随机接入消息包含前导序列Preamble和上行共享信道PUSCH承载的负载中至少一种信息；
所述第一处理模块402，用于根据所述第一随机接入消息生成随机接入响应消息，并发送给发送模块；所述随机接入响应消息的媒体接入控制协议数据单元MAC PDU包含第一响应消息、第二响应消息和第三响应消息中的任意一种或者多种消息类型的组合，每种响应消息对应一个MAC PDU子单元；
所述第一响应消息为基站对前导序列正确检测，但对PUSCH承载的负载未正确检测时的响应消息；
所述第二响应消息为基站对前导序列和PUSCH承载的负载都正确检测时的响应消息；
所述第三响应消息为基站对前导序列正确检测，但对应无PUSCH承载的负载时的响应消息；
所述发送模块403，用于向所述UE发送随机接入响应消息。
为清楚说明本申请实施例提供的随机接入的方法，下面结合附图，列举具体实例对本申请实施例提供的随机接入方法进行说明。
通过以下三个特征来描述本申请实施例提供的随机接入的方法：系统配置随机接入响应消息格式及参数、随机接入重传机制、以及随机接入响应消息MAC PDU生成方式。
特征1：系统配置2-step RACH和4-step RACH响应消息格式 及参数
在基站侧，需要检测RACH中的以下几种信息，并根据检测结果进行响应
1)4-stepRACH中的Msg1，对其响应4-stepRACH中的Msg2
2)4-stepRACH中的Msg3，对其响应4-stepRACH中的Msg4
3)2-stepRACH中的MsgA，对其响应2-step RACH中的MsgB
其中上述3)可进一步包含对MsgA的前导序列正确检测、PUSCH承载的负载未正确检测的UE反馈响应消息，对MsgA的前导序列和PUSCH承载的负载正确检测的UE反馈响应消息。其中MsgA和Msg1对应为所述第一随机接入消息中应用不同随机接入方式下的应用举例。当采用2-stepRACH发起随机接入时，所述第一随机接入消息对应为MsgA，当采用4-stepRACH发起随机接入时，所述第一随机接入消息对应为Msg1。MsgA包含了前导序列和PUSCH承载的负载，Msg1包含前导序列。
本申请将所述针对2-step RACH发送MsgA的前导序列正确检测、 PUSCH承载的负载未正确检测的响应消息对应为第一响应消息；所述针对2-step RACH发送MsgA的前导序列和PUSCH承载的负载正确检测的响应消息对应为第二响应消息；所述针对4-stepRACH Msg1的响应消息Msg2对应为第三响应消息。基站端将多个UE的响应消息组装成一个MAC PDU发送给UE时，该UE对应的响应消息为MAC PDU的某一个子单元(subPDU)。
针对第一响应消息：响应消息格式包含前导序列ID(RAPID)、TA指示、TC-RNTI指示、上行授权等指示。其中部分信息可作为可选项，具体根据系统配置确定包含的信息内容。所述响应消息格式与该响应消息对应的MAC subPDU的格式表示相同概念(下文同)。举例响应消息格式，例如下面三种：
第一种：第一响应消息格式包含前导序列ID(RAPID)和TA指示。响应消息格式示意图如图5所示，图5为本申请实施例第一种第一响应消息MAC subPDU格式的示意图。表示为：subheader(E+T+RAPID)+Payload(TA)。该MAC subPDU包括子头(subheader)和负载(Payload)，负载即MAC RAR。
其中在subheader中包含“E”域用以指示该subPDU是否为最后一个，“T”域用以指示是否包含RAPID信息，“RAPID”指示前导序列ID，在payload域中的“R”域为保留比特，“TA”指示定时提前信息。
第二种：第一响应消息格式包含前导序列ID、TA和TC-RNTI指示。响应消息格式示意图如图6所示，图6为本申请实施例第二种第一响应消息MAC subPDU格式的示意图。
表示为： subheader(E+T+RAPID)+Payload(TA+TC-RNTI)。
相比第一种格式增加“TC-RNTI”信息，用以MsgA重传时PUSCH的生成。
第三种：第一响应消息格式复用现有RACH的响应消息格式，其中格式的MACsubPDU的负载部分如图7所示，将响应消息中不包含的内容置零。例如不反馈上行授权时，则将消息格式中上行授权部分内容设置为零。此时该响应消息格式的长度与现有RACH的响应消息格式长度相同。
图7为本申请实施例第三种第一响应消息MAC subPDU中的MAC RAR示意图。表示为： Payload(TA+UL GRANT+TC-RNTI)。
进一步地，当配置除仅包含前导序列ID，或回退指示的MACsubPDU之外，不同长度的随机接入响应消息组装成一个MAC PDU时，系统进一步配置响应消息MAC subPDU中的比特域以指示该MAC subPDU所属的响应消息格式。例如在图5、图6或图7中的进一步利用保留比特指示该MAC subPDU所属的响应消息格式对应为2-step RACH中MsgA前导序列正确检测、PUSCH承载的负载未正确检测的响应消息。又例如重新设计MAC subPDU中的subheader中的T域，指示该MAC subPDU所属的响应消息格式。
针对第二响应消息：当UE利用2-step RACH发送MsgA时，其前导序列和PUSCH承载的负载正确检测时，根据不同RACH触发事件需求，设计的随机接入响应消息内容与触发事件相对应，以及可以包含前导序列ID、TA、竞争冲突解决标识、TC-RNTI等信息。其中部分信息作为可选项，依据系统配置以及触发事件确定具体包含信息内容。例如如果UE在MsgA中包含了C-RNTI信息，则在响应消息中可不包含TC-RNTI信息。
特征2：系统配置2-step RACH重传机制，配置包括：
1)配置MsgA最大传输次数，当MsgA传输次数超过配置最大传输次数时仍未随机接入成功时，回退到4-step RACH发起Msg1传 输或者基于调度(基站分配Msg3传输的上行授权)发起Msg3传输；例如当MsgA最大传输次数配置为1时，基站检测MsgA前导序列正确检测、PUSCH承载的负载未正确检测时，可在响应消息中反馈2-step RACH回退到4-step RACH发送Msg3传输的上行授权。
2)配置MsgA自适应重传或非自适应重传，对于自适应重传在重传时重新选择前导序列以及对应的PUSCH资源；对于非自适应重传在重传时选择相同的前导序列以及PUSCH资源位置，以支持基站端对MsgA PUSCH的传输进行HARQ合并检测。
进一步地，非自适应重传中针对MsgA的前导序列正确检测、PUSCH承载的负载未正确检测的场景，下一次重传可配置为仅重传PUSCH承载的负载。在该配置下，当UE检测到与MsgA对应的第一响应消息，则在MsgA未超过最大重传次数时下一次MsgA重传仅重传PUSCH承载的负载。
进一步地，对于非自适应重传仅重传PUSCH承载的负载场景，可配置在响应消息中包含TC-RNTI信息，重传PUSCH承载的负载基于响应消息中的TC-RNTI生成。
进一步地，基站可配置重传定时信息，以指示UE下一次重传PUSCH承载的负载的时间，其中重传定时信息可包含在响应消息中指示，或者通过RRC配置的方式由基站将配置信息通知UE。
3)配置MsgA的重传回退指示BI取值列表，可以规定2-step RACH中BI与4-step RACH的BI共用相同列表，或者为2-step RACH的重传独立设计一个新的重传回退指示列表。
进一步地，上述配置信息1)、2)和3)可以包含在RRC信令中关于2-step RACH的配置信息中，并由基站通知给UE；或者包含在物理下行控制信道(PDCCH)中由基站通知给UE；或者通过设备配 置写入基站和UE中。
上述2-step RACH的重传为随机接入的重新发起，根据系统配置，正在利用2-step RACH发起随机接入的UE可包含以下4种随机接入的重新发起：第一种是利用2-step RACH发起MsgA的前导序列和PUSCH承载的负载重传，第二种是利用2-step RACH仅发起PUSCH承载的负载的重传，第三种是回退到4-step RACH发起Msg1的传输，第四种是回退到4-step RACH发起Msg3的传输。
特征3：系统配置随机接入响应消息MAC PDU生成方式。该方式中体现了2-step RACH和4-step RACH响应消息之间的复用关系。根据随机接入响应消息MAC PDU的生成方式确定针对2-step RACH MsgA的随机接入响应消息是否和4-step RACH响应消息Msg2组装成一个MAC PDU。包括第一响应消息、第二响应消息和第三响应消息中的一个或多个组装成一个MAC PDU的格式。举例如下：
1.第一响应消息和第三响应消息组装成一个MAC PDU
进一步地，当4-step RACH和2-step RACH共用相同的重传回退计时机制时，基站反馈的RACH响应消息MAC PDU中的MAC subPDU包含以下几种类型：
1)MAC subPDU1仅指示BI
2)MAC subPDU2仅指示前导序列ID
3)MAC subPDU3表示第三响应消息，子头指示前导序列ID，负载指示TA、TC-RNTI、上行授权。其中负载示意图如图7所示。
4)MAC subPDU4表示第一响应消息
其中上述4)MAC subPDU4可能进一步包含多种响应消息格式以支持包含不同响应消息内容，例如包含上述图5、图6、图7的一种格式或多种格式。当4)包含一种格式，且与3)使用相同的响应 消息格式的情况，此时格式类型变为前三种。MAC PDU根据传输包大小可能包含一定的补零比特，即图8所示padding。图8为本申请实施例随机接入响应消息中包括第一响应消息和第三响应消息的MAC PDU的示意图。其中“MAC subPDU1”为仅指示BI的示意。“MAC subPDU2”为仅指示前导序列ID的示意。“MAC subPDU3”的“RAPID+RAR”为子头指示前导序列ID，负载指示TA、TC-RNTI、上行授权的示意。“2-step RACH MAC RAR type1”为所述第一响应消息MAC subPDU的payload部分示意。
进一步地，当4-step RACH和2-step RACH配置相互独立的重传回退计时机制时，基站反馈的RACH响应消息MAC PDU中的MAC subPDU包含以下几种类型：
1)MAC subPDU1仅指示针对4-step RACH的BI
2)MAC subPDU2仅指示针对2-step RACH的BI
3)MAC subPDU3仅指示前导序列ID
4)MAC subPDU4表示第三响应消息，子头指示前导序列ID，负载指示TA、TC-RNTI、上行授权。其中负载示意图如图7所示。
5)MAC subPDU5表示第一响应消息
其中上述5)可能进一步包含多种响应消息格式以支持包含不同响应消息内容，例如包含上述图5、图6、图7的一种格式或多种格式。当5)包含一种格式，且与4)使用相同的响应消息格式的情况，此时格式类型变为前4种。MAC PDU根据传输包大小可能包含一定的补零比特，即图9所示padding。图9为本申请另一实施例随机接入响应消息中包括第一响应消息和第三响应消息的MAC PDU的示意图。其中“MAC subPDU1”为仅指示针对4-step RACH的BI示意。“MAC subPDU2”为仅指示针对2-step RACH的BI示意。
进一步地，为区分一个指示“BI”的subPDU属于4-step RACH和2-step RACH中的哪一个，需利用包头“BI”占据的比特之外的比特进行指示该BI信息属于4-step RACH UE的回退指示或者2-step RACH UE的回退指示，例如将其中一个保留比特“R”设计为一个新的指示域，值为1标识该“BI”属于2-step RACH的UE响应，值为“0”标识该“BI”属于4-step RACH的UE响应；或者是值为0标识该“BI”属于2-step RACH的UE响应，值为“1”标识该“BI”属于4-step RACH的UE响应。
(2)第一响应消息、第二响应消息和第三响应消息组装成一个MAC PDU。
进一步地，当4-step RACH和2-step RACH共用相同的重传回退计时机制时，基站反馈的RACH响应消息MAC PDU中的MAC subPDU格式包含以下几种类型：
1)MAC subPDU1仅指示BI
2)MAC subPDU2仅指示前导序列ID
3)MAC subPDU3表示第三响应消息，子头指示前导序列ID，负载指示TA、TC-RNTI、上行授权。其中负载示意图如图7所示。
4)MAC subPDU4表示第一响应消息
5)MAC subPDU5表示第二响应消息
其中上述4)可能进一步包含多种响应消息格式以支持包含不同响应消息内容，例如包含上述图5、图6、图7的一种格式或多种格式。当4)包含一种格式，且与3)使用相同的subPDU格式的情况，此时格式类型4)和3)可以合并为一种。上述5)可能根据系统配置进一步包含多种响应消息格式，以对应满足不同的触发事件响应消息内容的需求。MAC PDU根据传输包大小可能包含一定的补零比特， 即图10所示padding。图10为本申请实施例随机接入响应消息中包括第一响应消息、第二响应消息和第三响应消息的MAC PDU的示意图。其中“2-step RACH MAC RAR type1”为所述第一响应消息MAC subPDU的payload部分示意。“2-step RACH MAC RAR type2”为所述第二响应消息MAC subPDU的payload部分示意。
进一步地，当4-step RACH和2-step RACH配置相互独立的重传回退计时机制时，基站反馈的RACH响应消息MAC PDU中的MAC subPDU格式包含以下几种类型：
1)MAC subPDU1仅指示针对4-step RACH的BI
2)MAC subPDU2仅指示针对2-step RACH的BI
3)MAC subPDU3仅指示前导序列ID
4)MAC subPDU4表示第三响应消息，子头指示前导序列ID，负载指示TA、TC-RNTI、上行授权。其中负载示意图如图7所示。
5)MAC subPDU5表示第一响应消息
1.MAC subPDU6表示第二响应消息
其中上述5)可能进一步包含多种响应消息格式以支持包含不同响应消息内容，例如包含上述图5、图6、图7的一种格式或多种格式。当5)包含一种格式，且与4)使用相同的subPDU格式的情况，此时格式类型5)和4)可以合并为一种。上述6)可能根据系统配置进一步包含多种响应消息格式，以对应满足不同的触发事件响应消息内容的需求。MAC PDU根据传输包大小可能包含一定的补零比特，即图11所示padding。图11为本申请另一实施例随机接入响应消息中包括第一响应消息、第二响应消息和第三响应消息的MAC PDU的示意图。其中为区分一个指示“BI”的subPDU属于4-step RACH和2-step RACH中的哪一个，需利用包头“BI”占据的字节之外的比特 进行指示该BI信息属于4-step RACHUE的回退指示或者2-step RACHUE的回退指示，例如将其中一个保留比特“R”设计为一个新的指示域，值为1标识该“BI”属于2-step RACH的UE响应，值为“0”标识该“BI”属于4-step RACH的UE响应；或者是值为0标识该“BI”属于2-step RACH的UE响应，值为“1”标识该“BI”属于4-step RACH的UE响应。
(3)第一响应消息和第二响应消息组装成一个MAC PDU。该MAC PDU与4-step RACH响应消息相互独立。
基站反馈的2-step RACH响应消息MAC PDU中的MAC subPDU包含以下几种类型：
1)MAC subPDU1仅指示BI
2)MAC subPDU2仅指示前导序列ID
3)MAC subPDU3表示第一响应消息
4)MAC subPDU4表示第二响应消息
其中，上述2)当2-step RACH中未对应有仅反馈前导序列ID的需求时，可不包含该类型subPDU。
上述3)可能进一步包含多种响应消息格式以支持包含不同响应消息内容，例如包含上述图5、图6、图7的一种格式或多种格式。
上述4)可能根据系统配置进一步包含多种响应消息格式，以对应满足不同的触发事件响应消息内容的需求。MAC PDU根据传输包大小可能包含一定的补零比特。
(4)第一响应消息组装成一个MAC PDU。该MAC PDU与4-step RACH响应消息相互独立。
基站反馈的第一响应消息组装的MAC PDU中的MAC subPDU包含以下几种类型：
1)MAC subPDU1仅指示BI
2)MAC subPDU2仅指示前导序列ID
3)MAC subPDU3表示第一响应消息
其中上述2)当2-step RACH中未对应有仅反馈前导序列ID的需求时，可不包含该类型subPDU。上述3)可能进一步包含多种响应消息格式以支持包含不同响应消息内容，例如包含上述图5、图6、图7的一种格式或多种格式。MAC PDU根据传输包大小可能包含一定的补零比特。
进一步地，系统配置2-step RACH和4-step RACH响应消息之间的复用关系以及2-stepRACH响应消息设计可通过RACH响应消息的MAC PDU设计中体现，或者通过高层信令配置。系统通过MAC PDU的格式设计体现或者高层配置确定2-step RACH响应消息的MAC PDU的格式及参数。
进一步地，如上述所述当不同类型响应消息需组装成一个MAC PDU时，在响应消息对应的子单元(subPDU)格式中配置一个或多个比特指示该消息类型。例如当第一响应消息与第三响应消息组装成一个MAC PDU时，当第一响应消息和第三响应消息对应的MAC subPDU格式不同时，系统可配置第一响应消息中的一个或多个比特域指示该subPDU对应的响应消息属于2-step RACH的第一响应消息。相应地，系统可配置第三响应消息中的一个或多个比特域指示该subPDU对应的响应消息属于第三响应消息。
进一步地，系统配置通过随机接入相关标识区分该单元格式类型。当终端可根据随机接入相关标识识别当前检测的MAC subPDU所属的信息格式，则可无需在响应消息格式中配置响应消息中的一个或多 个比特域以指示该MAC subPDU所属的响应消息格式。例如系统配置2-step RACH和4-stepRACH采用不同的前导序列ID时，当配置第一响应消息和第三响应消息组装成一个MAC PDU时，终端可通过识别前导序列ID判断当前检测的MAC subPDU所属的信息格式是否是4-stepRACH响应消息格式。
进一步地，所述关于响应消息MAC PDU的生成方式可以包含在RRC信令中关于随机接入的配置信息中，并由基站通知给UE；或者包含在PDCCH中由基站通知给UE；或者通过设备配置写入基站和UE中。
二、基站向UE反馈RACH响应消息
在基站侧，需要检测RACH中的以下几种信息，并根据检测结果进行响应消息
1)4-stepRACH中的Msg1，对其响应4-stepRACH中的Msg2
2)4-stepRACH中的Msg3，对其响应4-stepRACH中的Msg4
3)2-stepRACH中的MsgA，对其响应2-step RACH中的MsgB
其中上述3)可进一步包含对MsgA的前导序列正确检测、PUSCH承载的负载未正确检测的UE反馈响应消息，对MsgA的前导序列和PUSCH承载的负载正确检测的UE反馈响应消息。
基站根据系统配置生成响应消息，并将响应消息发送给UE。
在一些实施例中，通过本申请的随机接入响应消息，能够支持2-step RACH的多次重传。具体地，
所述UE接收到所述随机接入响应消息后，检测是否为自身发送第一随机接入消息对应的响应消息内容；所述对应的响应消息内容包括：与已发送的前导序列对应的RAPID，和/或，与已发送的PUSCH 承载的负载对应的响应消息；
情况一：如果是自身发送第一随机接入消息对应的响应消息内容，其中包括与已发送的前导序列对应的RAPID，但对应无与已发送的PUSCH承载的负载对应的响应消息，则对应为UE采用2-stepRACH发起随机接入时基站对前导序列正确检测，但对PUSCH承载的负载未正确检测的情况，或者是UE采用4-step RACH或2-step RACH发起随机接入时基站仅对前导序列正确检测的情况；
情况二：如果是自身发送第一随机接入消息对应的响应消息内容，其中包括与已发送的前导序列对应的RAPID和或与已发送的PUSCH承载的负载对应的响应消息，则对应为UE采用2-stepRACH发起随机接入时基站对前导序列和PUSCH承载的负载都正确检测的情况；
情况三：如果不是自身发送第一随机接入消息对应的响应消息内容，例如，UE在发送MsgA之后，在系统配置的响应定时时间窗中等待接收响应，当响应定时超时时，UE未接收到任何与自己发送MsgA对应的响应信息内容，则对应为UE采用2-stepRACH发起随机接入时基站对前导序列和PUSCH承载的负载都未正确检测的情况，或是UE采用4-stepRACH发起随机接入时基站对前导序列未正确检测的情况，或是UE对基站发送的包含与自身发送第一随机接入消息对应的响应消息未正确检测的情况。
从而，所述UE根据系统随机接入配置和响应信息检测结果，判断是否重新发起随机接入或是第二随机接入消息的发送；
对应上述情况一：UE根据系统配置随机接入重传机制重新发起随机接入；
其中正在利用2-step RACH发起随机接入的UE包括了四种随机接入的重新发起：第一种是利用2-step RACH发起MsgA的前导序列 和PUSCH承载的负载重传，第二种是利用2-step RACH仅发起PUSCH承载的负载的重传，第三种是回退到4-step RACH发起Msg1的传输，第四种是回退到4-step RACH发起Msg3的传输。UE根据系统配置和检测结果选择上述一种方式发起MsgA重传。例如UE根据系统配置判定接到的响应信息内容是为自己发送MsgA对应的响应信息内容。如果对应的响应信息内容中包含上行授权，则利用上行授权回退到4-step RACH发送msg3(选择上述第四种)。如果未包含上行授权根据系统配置选择上述第一种、第二种或第三种中一种方式发起MsgA重传。如果对应的响应信息内容中包含TA信息，在下一信息发送根据TA进行发送定时调整。
正在利用4-step RACH发起随机接入的UE包括了两种随机接入的重新发起和一种第二随机接入消息的发送：第一种是是利用2-step RACH发起MsgA的前导序列和PUSCH承载的负载重传；第二种是利用4-step RACH发起Msg1的传输。所述一种第二随机接入消息的发送表示利用4-step RACH发起Msg3的传输。其中第二随机接入消息则为Msg3。
进一步地当UE利用2-step RACH发起随机接入时根据2-stepRACH的相关配置选择前导序列以及相关传输资源，生成相应的随机接入消息等。当UE利用4-step RACH发起随机接入时根据4-stepRACH的相关配置选择前导序列以及相关传输资源，生成相应的随机接入消息等。
对应上述情况二：UE进一步判断是否反馈正确接收响应消息的确认信息；例如反馈ACK或者NACK信息。如果对应的响应信息内容中包含TA信息，在下一信息发送根据TA进行发送定时调整。
对应上述情况三：当UE接收响应消息的时间窗内未接收到与自 身发送第一随机接入消息对应的响应消息内容，UE根据系统配置随机接入重传机制重新发起随机接入。
其中正在利用2-step RACH发起随机接入的UE包括了四种随机接入：第一种是利用2-step RACH发起MsgA的前导序列和PUSCH承载的负载重传，第二种是利用2-step RACH仅发起PUSCH承载的负载的重传，第三种是回退到4-step RACH发起Msg1的传输，第四种是回退到4-step RACH发起Msg3的传输。在MsgA前导序列和PUSCH承载的负载均未正确检测场景下，MsgA的重传在所述第一种和第三种选择。
基于相同的发明构思，本申请还提供了一种用户设备UE，结构示意图如图12所示，所述UE包括第二接收模块1201和第二处理模块1202；
所述第二接收模块1201，用于接收到随机接入响应消息后，检测是否为自身发送第一随机接入消息对应的响应消息内容；所述对应的响应消息内容包括：与已发送的前导序列对应的RAPID，和/或，与已发送的PUSCH承载的负载对应的响应消息；
所述第二处理模块1202，
用于在第二接收模块1201检测出是自身发送第一随机接入消息对应的响应消息内容，其中包括与已发送的前导序列对应的RAPID，但对应无PUSCH承载的负载对应的响应消息时，并根据系统配置随机接入重传机制重新发起随机接入或发送第二随机接入消息；
用于在第二接收模块1201检测出是自身发送第一随机接入消息对应的响应消息内容，其中包括与已发送的前导序列对应的RAPID以及与已发送的PUSCH承载的负载对应的响应消息时，根据系统配置进一步判断是否反馈正确接收响应消息的确认信息；
用于在第二接收模块1201在系统配置的接收响应消息的时间窗内未接收到与自身发送第一随机接入消息对应的响应消息内容，UE根据系统配置随机接入重传机制重新发起随机接入。
由以上描述可以看出，本申请提供的随机接入的方法、基站及用户设备可以具备以下优点：
1)本申请的随机接入响应消息将2-step RACH的响应信息和4-step RACH的响应信息组装为一个MAC PDU。
2)本申请的随机接入响应消息可以支持2-step RACH的多次重传。
请参见图13，为本申请实施例提供的一种计算设备的结构示意图。该计算设备可以是用户设备也可以是基站。如图13所示，该计算设备包括供电电源、各类壳体等结构，所述计算设备还可以包括：至少一个处理器1301，输入接口1302，输出接口1303，存储器1304。
在一个实施例中，输入接口1302可以是一些网络接口或者用户接口，通过输入接口1302可以从网络上下载音频训练文件或者待分类的音频文件，或者接收用户输入的音频训练文件或者待分类的音频文件。所述输出接口1303也可以为一些网络接口或者显示屏等显示接口，能够将分类结果或者分类后的音频文件输出或者显示给用户。
所述存储器1304可以包括易失性存储器(volatile memory)，如随机存取存储器(random-access memory，RAM)；存储器1304也可以包括非易失性存储器(non-volatile memory)，如快闪存储器(flash memory)，固态硬盘(solid-state drive，SSD)等；存储器1304还可以包括上述种类的存储器的组合。
所述处理器1301可以是中央处理器(central processing unit，CPU)。在一个实施例中，所述处理器1301还可以包括硬件芯片。上述硬件 芯片可以是专用集成电路(application-specific integrated circuit，ASIC)，可编程逻辑器件(programmable logic device，PLD)等。上述PLD可以是现场可编程逻辑门阵列(field-programmable gate array，FPGA)，通用阵列逻辑(generic array logic，GAL)等。
在一个实施例中，所述存储器1304还用于存储程序指令。所述处理器1301可以调用所述程序指令，实现上述提及的各种方法和步骤。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存储记忆体(Random Access Memory，RAM)等。
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 (12)

  1. 一种随机接入的方法，由基站执行，该方法包括：
    基站接收到用户设备UE发送的第一随机接入消息后，向所述UE发送随机接入响应消息，指示所述UE进行随机接入；所述第一随机接入消息包含前导序列Preamble和上行共享信道PUSCH承载的负载中至少一种信息；
    其中，所述随机接入响应消息的媒体接入控制协议数据单元MAC PDU包含第一响应消息、第二响应消息和第三响应消息中的任意一种或者多种消息类型的组合，每种响应消息对应一个MAC PDU子单元；
    所述第一响应消息为基站对前导序列正确检测，但对PUSCH承载的负载未正确检测时的响应消息；
    所述第二响应消息为基站对前导序列和PUSCH承载的负载都正确检测时的响应消息；
    所述第三响应消息为基站对前导序列正确检测，但对应无PUSCH承载的负载时的响应消息。
  2. 如权利要求1所述的方法，其中，
    所述第一响应消息对应的MAC PDU子单元中的负载中包括：定时提前信息TA，上行授权信息UL Grant，临时小区无线网络临时标识TC-RNTI字段的一种或者几种的组合；
    所述第二响应消息对应的MAC PDU子单元中的负载中包括：与PUSCH承载的负载对应的响应消息；
    所述第三响应消息对应的MAC PDU子单元中的负载中包括：TA，UL Grant和TC-RNTI字段。
  3. 如权利要求1所述的方法，其中，所述随机接入响应消息的 针对不同消息类型的MAC PDU子单元中，包含用于区分各消息类型的比特。
  4. 如权利要求2所述的方法，其中，当所述第一响应消息对应的MAC PDU子单元中的负载中包括定时提前信息TA，上行授权信息UL Grant和临时小区无线网络临时标识TC-RNTI字段时，将其中无需指示的字段值置零。
  5. 如权利要求1所述的方法，其中，所述随机接入响应消息的MAC PDU的格式配置包含在无线资源控制RRC信令中由基站通知给UE；或者包含在物理下行控制信道PDCCH中由基站通知给UE；或者通过设备配置写入基站和UE中。
  6. 如权利要求1所述的方法，其中，所述随机接入响应消息的MAC PDU中两步随机接入信道重传回退指示BI和四步随机接入信道重传回退指示BI共用配置或者相互独立配置。
  7. 如权利要求6所述的方法，其中，所述随机接入响应消息的MAC PDU中两步随机接入信道重传回退指示BI和四步随机接入信道重传回退指示BI共用配置，具体包括：
    所述随机接入响应消息的MAC PDU中包含第三重传回退指示BI，所述第三BI用于指示UE在随机接入失败后重新发起两步随机接入或者四步随机接入。
  8. 如权利要求1所述的方法，其中，
    所述UE接收到所述随机接入响应消息后，检测是否为自身发送第一随机接入消息对应的响应消息内容；所述对应的响应消息内容包括：与已发送的前导序列对应的RAPID，和/或，与已发送的PUSCH承载的负载对应的响应消息；
    如果是自身发送第一随机接入消息对应的响应消息内容，其中包 括与已发送的前导序列对应的RAPID，但对应无与已发送的PUSCH承载的负载对应的响应消息，则UE根据系统配置随机接入重传机制重新发起随机接入或发送第二随机接入消息；
    如果是自身发送第一随机接入消息对应的响应消息内容，其中包括与已发送的前导序列对应的RAPID和或与已发送的PUSCH承载的负载对应的响应消息，则UE进一步根据系统配置判断是否反馈正确接收响应消息的确认信息；
    如果系统配置的接收响应消息时间窗内未收到与自身发送第一随机接入消息对应的响应消息内容，则UE根据系统配置随机接入重传机制重新发起随机接入。
  9. 一种基站，所述基站包括第一接收模块、第一处理模块和发送模块；
    所述第一接收模块，用于接收用户设备UE发送的第一随机接入消息，并发送给第一处理模块；所述第一随机接入消息包含前导序列Preamble和上行共享信道PUSCH承载的负载中至少一种信息；
    所述第一处理模块，用于根据所述第一随机接入消息生成随机接入响应消息，并发送给发送模块；所述随机接入响应消息的媒体接入控制协议数据单元MAC PDU包含第一响应消息、第二响应消息和第三响应消息中的任意一种或者多种消息类型的组合，每种响应消息对应一个MAC PDU子单元；
    所述第一响应消息为基站对前导序列正确检测，但对PUSCH承载的负载未正确检测时的响应消息；
    所述第二响应消息为基站对前导序列和PUSCH承载的负载都正确检测时的响应消息；
    所述第三响应消息为基站对前导序列正确检测，但对应无PUSCH 承载的负载时的响应消息；
    所述发送模块，用于向所述UE发送随机接入响应消息。
  10. 一种用户设备UE，所述UE包括第二接收模块和第二处理模块；
    所述第二接收模块，用于接收到如权利要求8所述的随机接入响应消息后，检测是否为自身发送第一随机接入消息对应的响应消息内容；所述对应的响应消息内容包括：与已发送的前导序列对应的RAPID，和/或，与已发送的PUSCH承载的负载对应的响应消息；
    所述第二处理模块，
    用于在第二接收模块检测出是自身发送第一随机接入消息对应的响应消息内容，其中包括与已发送的前导序列对应的RAPID，但对应无PUSCH承载的负载对应的响应消息时，根据系统配置随机接入重传机制重新发起随机接入；
    用于在第二接收模块检测出是自身发送第一随机接入消息对应的响应消息内容，其中包括与已发送的前导序列对应的RAPID以及与已发送的PUSCH承载的负载对应的响应消息时，进一步根据系统配置判断是否反馈正确接收响应消息的确认信息；
    用于在第二接收模块在系统配置的接收响应消息的时间窗内未接收到与自身发送第一随机接入消息对应的响应消息内容时，根据系统配置随机接入重传机制重新发起随机接入。
  11. 一种计算设备，所述计算设备包括处理器和存储装置；
    所述存储装置中存储有计算机应用程序指令，所述处理器调用所述程序指令，用于执行如权利要求1-10任一项所述的方法。
  12. 一种计算机可读存储介质，所述计算机可读存储介质中存储有程序指令，所述程序指令被执行时，实现如权利要求1-10任一项 所述的方法。
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