WO2022199605A1 - 确定随机接入过程是否成功的方法以及用户设备 - Google Patents

确定随机接入过程是否成功的方法以及用户设备 Download PDF

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Publication number
WO2022199605A1
WO2022199605A1 PCT/CN2022/082453 CN2022082453W WO2022199605A1 WO 2022199605 A1 WO2022199605 A1 WO 2022199605A1 CN 2022082453 W CN2022082453 W CN 2022082453W WO 2022199605 A1 WO2022199605 A1 WO 2022199605A1
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Prior art keywords
random access
message
access procedure
specific interaction
triggered
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PCT/CN2022/082453
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English (en)
French (fr)
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张崇铭
刘仁茂
肖芳英
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夏普株式会社
张崇铭
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Publication of WO2022199605A1 publication Critical patent/WO2022199605A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to the technical field of wireless communication, and more particularly, to a method for determining whether a random access procedure is successful and a corresponding user equipment.
  • the UE entering the RRC inactive state can send a transmission block ( Transport Block).
  • This transmission method may be referred to as PUR transmission.
  • a transport block carrying user data may also be sent in message 3 or message A. Both ways can be referred to as small data transfers.
  • the UE can trigger a random access procedure and report this information to the network side/base station to obtain further scheduling by the network side/base station.
  • the UE may receive the PDCCH scrambled with C-RNTI, but such PDCCH is used for small data transmission, not the response of the base station/network to the random access process, which will affect the random access process.
  • the judgment of the ongoing random access process causes confusion. Therefore, how to judge the successful completion of the triggered random access in a small data transmission process is a problem that needs to be solved.
  • the purpose of the present invention is to provide a method and user equipment for determining whether a random access procedure is successful.
  • a method performed by a user equipment for determining whether a random access procedure is successful comprising: sending a specific interaction message for a random access procedure to a base station, where the specific interaction message carries the user identification of the device; starting a timer; confirming whether an indication message including an acknowledgment message indicated by the base station is received during the running of the timer, the acknowledgment message indicating that the base station has received the specific interaction message; In this case, when the acknowledgment message is received during the running of the timer, it is determined that the random access procedure has been successfully completed.
  • the specific situation includes at least one of the following: the currently triggered random access procedure is triggered by the user equipment during a small data transmission process; the currently triggered random access procedure is the user equipment Triggered in the inactive state; the currently triggered random access process is triggered by the MAC layer; the DCCH message is carried in the specific interaction message of the currently triggered random access process; in the currently triggered random access process
  • the specific interaction message of the process carries the data/MAC SDU from the logical channel identified as 1.
  • a timer associated with the small data transmission is running;
  • the user equipment is in an inactive state, but is able to transmit user data within a given time before the random access process.
  • sending the specific interaction message for the random access process to the base station is implemented by using the first specific interaction message sending process or the second specific interaction message sending process.
  • the first specific interaction message sending process may include: sending a preamble sequence to the base station; receiving a random access response sent by the base station for the preamble sequence; and sending a random access response to the base station upon receiving the random access response.
  • the base station sends the specific interaction message.
  • the second specific interaction message sending process may include: sending the specific interaction message including a preamble sequence and a bearer of the specific interaction message to the base station, where the bearer of the specific interaction message includes the identifier of the user equipment.
  • the first confirmation process may include: when monitoring the PDCCH associated with the identifier of the user equipment, determining whether the monitored PDCCH indicates downlink assignment; if the monitored PDCCH indicates downlink assignment, then determining whether the monitored PDCCH indicates downlink assignment decoding the transport block indicated in the downlink assignment; and if the downlink assignment is correctly decoded, determining whether the indication message is included in the transport block to determine whether the indication message is received.
  • the second confirmation process may include: when monitoring the PDCCH associated with the identity of the user equipment, confirming whether the PDCCH carries the DCI using the DCI format for determining feedback; and carrying the PDCCH using the DCI format.
  • the DCI of the DCI format for feedback is determined, it is confirmed that the indication message is received.
  • the indication message includes MAC CE.
  • the method further includes: when it is determined that the random access procedure has been successfully completed, stopping running a contention collision timer for random access.
  • the DCI format is a DCI format used to trigger a random access process in a small data transmission process or a DCI format used to trigger a random access process in an inactive state.
  • the specific interaction message also carries at least one of the following: a DCCH message; a data arrival message of a DRB that is not configured with SDT; data or MAC SDU from a logical channel identified as 1.
  • a user equipment comprising: a processor; and a memory storing instructions, wherein the instructions, when executed by the processor, perform the above method according to the claims.
  • FIG. 1 is a flowchart for explaining a four-step random access procedure involved in the present invention.
  • FIG. 2 is a flow chart for explaining the two-step random access procedure involved in the present invention.
  • FIG. 3 is a flowchart for explaining a method for determining whether a random access procedure is successful according to the present invention.
  • FIG. 4 is a flowchart for explaining the first confirmation process in the method for determining whether the random access process is successful according to the present invention.
  • FIG. 5 is a flowchart for explaining the second confirmation process in the method for determining whether the random access process is successful according to the present invention.
  • FIG. 6 is a block diagram illustrating the structure of the user equipment involved in the present invention.
  • the NR mobile communication system and its subsequent evolved versions are used as an example application environment, and the base station and UE equipment supporting NR are used as examples to specifically describe various embodiments according to the present invention.
  • the present invention is not limited to the following embodiments, but is applicable to more other wireless communication systems, such as eLTE, communication systems, or NB-Iot systems, or LTE-M systems. And it can be applied to other base stations and UE devices, such as base stations and UE devices supporting eLTE/NB-Iot/LTE-M.
  • small data mainly means that the size of the data or the packets carrying the data (for example, the MAC PDU/RLC PDU/PDCP PDU carrying the data) does not exceed a predetermined value.
  • This value can be broadcast by the base station or the network side in the system information.
  • the UE determines that the size of the data to be sent or the data packet does not exceed this value, the UE can directly send the data to the base station or the network side through the random access process, without first entering the RRC connection state and then performing data transmission. process.
  • the data type here mainly refers to the user plane data (User Plane data, UP data). Control Plane data (CP data) can also be transmitted by this method.
  • the random access procedure involved in this specification includes a four-step random access procedure and a two-step random access procedure. The following description will be made with reference to FIGS. 1 and 2 .
  • FIG. 1 is a flowchart for explaining a four-step random access procedure involved in the present invention.
  • the 4-step random access procedure performed by the UE includes the following steps:
  • Step S100 The UE selects random access resources for random access. in this process:
  • the UE has selected a preamble for transmission, and sets the sequence number corresponding to the selected preamble to the value of the parameter PREAMBLE_INDEX;
  • Step S101 The UE sends the selected preamble on the determined PRACH occasion.
  • Step S102 The UE receives a random access response (Random Access Response, RAR) sent from the base station side.
  • RAR Random Access Response
  • the UE can determine that the RAR is sent to itself.
  • a UL grant is carried in such a RAR.
  • the UL grant indicates the PUSCH resource used to transmit message three.
  • the UE After receiving the above RAR, the UE will process the UL grant carried in the RAR and indicate it to the lower layer. If this is the first time that the UE successfully receives the above RAR, the UE obtains the MAC PDU for transmission from the Multiplexing and Assembly entity and saves it in the buffer area of message 3 (MSG3 buffer).
  • MSG3 buffer the buffer area of message 3
  • Step S103 The UE sends message three on the PUSCH resource indicated by the UL grant.
  • the UE will carry identification information for contention conflict resolution.
  • Step S104 The UE receives the message 4 sent by the base station side.
  • the UE If the message 4 carries the identity information carried by the UE in the message 3, the UE considers that the contention conflict is resolved and the random access procedure is successfully completed.
  • the above four-step random access procedure may also be referred to as the first type of layer 1 random access (Type-1 layer 1 Random Access Procedure, type 1 L1 RA).
  • Type-1 layer 1 Random Access Procedure type 1 L1 RA
  • the type 1 L1 RA process at least includes the transmission of the random access preamble (or the transmission of message one) on the PRACH, and the random access response.
  • Transmission/reception of message (Random Access Response Message)
  • the transmission of this random access response message is scheduled by PDCCH and transmitted on PDSCH; in addition, random access response can also be included in the type 1 L1 RA process
  • Fig. 2 is a flow chart for explaining the two- step random access procedure involved in the present invention.
  • the two-step random access process is:
  • Step S200 The UE selects random access resources for random access. in this process
  • the UE has selected a preamble for transmission, and sets the sequence number corresponding to the selected preamble to the value of the parameter PREAMBLE_INDEX;
  • Step S201 The UE sends a message A (MSG A) to the base station.
  • the message A includes the preamble and the payload of the message A.
  • the preamble is sent on PRACH, and the payload of message A is sent on PUSCH.
  • the payload of message A is packaged as a MAC PDU and transmitted on the PUSCH.
  • Step S202 The UE receives the message B (MSGB B) sent by the base station.
  • the message B carries information for contention conflict resolution.
  • Fig. 3 is a flow chart for explaining a method for determining whether a random access procedure is successful or not related to the present invention .
  • a specific interaction message for a random access procedure is sent to the base station, where the specific interaction message carries the identifier of the user equipment.
  • the specific interaction message may be sent by adopting the four-step random access procedure shown in FIG. 1 , and at this time, the specific interaction message may correspond to message three in the four-step random access procedure.
  • the two-step random access process shown in FIG. 2 can also be used to send the specific interaction message, and at this time the specific interaction message can correspond to the message A in the two-step random access process.
  • a timer is started.
  • the timer may be the contention collision timer described later, and when the two-step random access procedure is adopted, the timer may be the message B response window timer described later.
  • S303 it is determined whether an indication message including an acknowledgment message indicated by the base station is received, and the acknowledgment message indicates that the base station has received a specific interaction message. If an indication message is received, in S304, it is determined whether a specific condition is satisfied. Reference is made later for descriptions of specific cases. If the specific condition is satisfied, at S306, it is determined that the random access procedure has been successfully completed.
  • the method of the present invention is not limited to the sequence shown in FIG. 3 , for example, it is also possible to first determine whether a specific condition is satisfied, and determine whether an indication message is received when it is determined that the specific condition is satisfied.
  • the indication message may be, for example, a MAC CE described later or a DCI in a specific DCI format.
  • the operation of determining whether the indication message is received may be implemented by adopting the first determination process or the second determination process.
  • the first determination process and the second determination process are described below with reference to FIGS. 4 and 5 .
  • FIG. 4 is a flowchart for explaining the first confirmation process in the method for determining whether the random access process is successful according to the present invention.
  • the PDCCH associated with the identifier of the user equipment is monitored.
  • it is determined whether an associated PDCCH is monitored. If the PDCCH associated with the identity of the user equipment is monitored, in S403, it is determined whether the monitored PDCCH indicates downlink assignment.
  • the downlink assignment is decoded, and at S405, it is determined whether the downlink assignment is successfully decoded. If the downlink assignment is successfully decoded, at S406, it is determined whether the downlink assignment includes the above-mentioned indication message. If the indication message is included, in S407, it is determined that the random access procedure has been successfully completed.
  • S403, S405, and S406 are negative, in S408, it is determined whether the timer has expired. If the timer is still running, it returns to S401, and continues to monitor the associated PDCCH. If the timer has expired, then End the first determination process.
  • FIG. 5 is a flowchart for explaining the second confirmation process in the method for determining whether the random access process is successful according to the present invention.
  • the PDCCH associated with the identifier of the user equipment is monitored, and at S502, it is determined whether the associated PDCCH is monitored.
  • the PDCCH associated with the identifier of the user equipment is monitored, in S503, it is determined whether the monitored PDCCH carries DCI of a specific DCI format, for example, a DCI of a DCI format used for determining feedback is used. If the DCI of a specific DCI format is carried in the PDCCH, in S504, it is confirmed that the indication message is received.
  • the UE triggers a 4-step random access process, which includes:
  • Step 1 the UE sends a preamble to the base station
  • Step 2 the UE receives the random access response (Random Access Response, RAR) sent by the base station
  • Step 3 the UE sends message 3 to the base station, where message 3 is the third message that the UE and the base station interact with, so it is called message 3.
  • message 3 is the third message that the UE and the base station interact with, so it is called message 3.
  • the messages exchanged in steps 1 and 2 can be called message 1 and message 2 respectively. .
  • the identifier of the UE is carried in the third message.
  • the C-RNTI is assembled into the C-RNTI MAC CE, carried in message 3 and sent to the base station.
  • the uplink resource used for sending message 3 is indicated by the RAR received in step 2.
  • the message 3 may also carry a DCCH message, and preferably, the message carries the data arrival information of the DRB that is not configured with SDT.
  • a DCCH message may also be a UE Assistance Information Message (UE Assistance Information Message).
  • message 3 also carries the data/MAC SDU from the logical channel with the identifier 1 (the LCID value is 1).
  • Step 4 the UE starts a contention conflict timer, and monitors (monitors) the downlink PDCCH channel during the running period of the timer.
  • the so-called monitoring means that the UE receives the downlink PDCCH and detects whether the PDCCH is scrambled by the UE's identity. If so, it indicates the information carried on the PDCCH, such as DCI sent to the UE. If not, then Indicates that the information carried on the PDCCH is not sent to the UE, and the UE can ignore the received PDCCH.
  • the currently triggered random access procedure is triggered by the UE during the small data transmission process
  • the currently triggered random access procedure is triggered by the UE in the INACTIVE state
  • the C-RNTI MAC CE is carried in message 3 of the currently triggered random access procedure
  • a DCCH message is carried in message 3 of the currently triggered random access procedure
  • the UE When all the following conditions are met, the UE considers that the triggered random access procedure is successfully completed (consider this Random Access procedure successfully completed).
  • Condition 1a When the UE receives the PDCCH scrambled by the UE's C-RNTI, or receives the PDCCH associated with the UE's C-RNTI; or receives the PDCCH transmission with the address of the C-RNTI (the PDCCH transmission is addressed to the C-RNTI)
  • Condition 1b The PDCCH satisfying Condition 1a indicates a downlink assignment.
  • Condition 1c The UE correctly decodes the transport block indicated in this downlink assignment.
  • the transport block contains a MAC PDU, and it can be considered that the UE has correctly decoded the MAC PDU contained in the downlink assignment.
  • Condition 1d The MAC PDU satisfying condition 1c contains indication information, which is used to indicate that the base station has received the message 3 sent by the UE in step 3. Such indication information can be carried in the MAC CE, such as defining a confirmation MAC CE (Confirmation MAC CE). Another embodiment of the condition 1d may be: the MAC PDU satisfying the condition 1c includes the Confirmation MAC CE.
  • the UE considers the contention resolution successful (consider this Contention Resolution successful), and stops the running contention conflict timer (stop ra-ContentionResolutionTimer), and can also complete the above MAC PDU disassembly and demultiplexing operations (finish the disassembly and demultiplexing of the MAC PDU).
  • the UE can determine that the currently triggered random access procedure is when the UE is in the small data transmission.
  • In-process trigger for another example, the UE has received an indication of triggering or small data transmission from the upper layer (such as the RRC layer) before the currently triggered random access process, then the UE can determine the currently triggered random access The process is triggered by the UE during small data transmission.
  • Such an indication may be received within a given time, for example, an indication of triggering small data transmission is received within X milliseconds before the current random access procedure is triggered, and the value of X may be 1-10.
  • the RRC layer will start a timer when small data transmission is triggered, and this timer may be used for detecting failure of small data transmission, or a timer for controlling/managing the small data transmission process.
  • this timer if the UE triggers the current random access procedure, it can be determined that the currently triggered random access procedure is triggered by the UE during the small data transmission procedure.
  • the UE is in an inactive state (INACTIVE), or is not in a connected state, but the UE can transmit user data, which means that the UE is in the process of small data transmission.
  • the currently triggered random access procedure is triggered by the UE in a connected state (RRC Connected State) or an active state, and preferably, is triggered by the MAC layer.
  • the currently triggered random access procedure is triggered by the RRC layer, then when one or more of the following conditions are met, the UE considers that the triggered random access procedure is successfully completed.
  • Condition 2a when the UE receives the PDCCH scrambled by the UE's C-RNTI, or in other words, receives the PDCCH associated with the UE's C-RNTI;
  • Condition 2b The PDCCH satisfying condition 2a indicates or contains an uplink grant for new transmission.
  • the UE considers that the contention conflict is successfully resolved, and stops the running contention conflict timer.
  • Such a supplementary situation can also be that the message 3 of the currently triggered random access procedure does not carry the DCCH message or the data/MAC SDU from the logical channel identified as 1, then when the above condition 2a is satisfied, the UE considers that the random access process is triggered. The access process completed successfully. Or when the above conditions 2a and 2b are satisfied, the UE considers that the triggered random access procedure is successfully completed.
  • the UE triggers the random access procedure, which specifically includes:
  • Step 1 the UE sends a preamble to the base station.
  • Step 2 the UE receives a random access response (RAR) sent by the base station.
  • RAR random access response
  • Step 3 the UE sends a message 3 to the base station, where the message 3 is the third message exchanged between the UE and the base station, so it is called the message 3.
  • the identifier of the UE such as the C-RNTI, is carried in the third message.
  • the C-RNTI is assembled into the C-RNTI MAC CE, carried in message 3 and sent to the base station.
  • the uplink resource used for sending message 3 is indicated by the RAR received in step 2.
  • the message 3 may also carry a DCCH message, and preferably, the message carries the data arrival information of the DRB that is not configured with SDT.
  • a DCCH message may also be a UE Assistance Information Message (UE Assistance Information Message).
  • message 3 also carries the data/MAC SDU from the logical channel identified as 1.
  • step 4 the UE starts a contention conflict timer, and monitors the PDCCH channel during the running period of the timer.
  • the currently triggered random access procedure is triggered by the UE during the small data transmission process
  • the currently triggered random access procedure is triggered by the UE in the inactive state
  • the C-RNTI MAC CE is carried in message 3 of the currently triggered random access procedure
  • the UE When all the following conditions are met, the UE considers that the triggered random access procedure is successfully completed.
  • Condition 3a When the UE receives the PDCCH scrambled by the UE's C-RNTI, or receives the PDCCH associated with the UE's C-RNTI; or receives the PDCCH transmission with the address of the C-RNTI (the PDCCH transmission is addressed to the C-RNTI)
  • the DCI carried in the PDCCH satisfying the condition 3a may adopt the DCI format (DCI format) used for acknowledgement feedback.
  • the existing DCI format 1_0 can be used, and the values of the frequency domain resource assignment fields of the DCI format 1_0 are all set to 1.
  • Such a DCI format 1_0 can be used for a triggered (initiated) random access procedure in a disconnected state, or in other words, a random access procedure triggered in a small data transmission procedure.
  • DCI format 0_1 can also be used, and the downlink feedback information flag (Downlink feedback Information flag) in it is set to 1, which is used to indicate that the reception of message three is confirmed.
  • Downlink feedback Information flag Downlink feedback Information flag
  • the UE considers that the contention conflict resolution is successful (consider this Contention Resolution successful), and stops the running contention conflict timer (stop ra-ContentionResolutionTimer).
  • the currently triggered random access procedure is triggered by the UE in a connected state (RRC Connected State) or an active state, and preferably, is triggered by the MAC layer.
  • the currently triggered random access procedure is triggered by the RRC layer, then when one or more of the following conditions are met, the UE considers that the triggered random access procedure is successfully completed.
  • Condition 2a when the UE receives the PDCCH scrambled by the UE's C-RNTI, or in other words, receives the PDCCH associated with the UE's C-RNTI;
  • Condition 2b The PDCCH satisfying condition 2a indicates or contains an uplink grant for new transmission.
  • the UE when the above conditions (2a-2b) are satisfied, the UE considers that the contention conflict is successfully resolved, and stops the running contention conflict timer.
  • Such a supplementary situation can also be that the message 3 of the currently triggered random access procedure does not carry the DCCH message or the data/MAC SDU from the logical channel identified as 1, then when the above condition 2a is satisfied, the UE considers that the random access process is triggered. The access process completed successfully. Or when the above conditions 2a and 2b are satisfied, the UE considers that the triggered random access procedure is successfully completed.
  • Embodiment 1 The difference from Embodiment 1 is that the UE triggers a two-step random access procedure, which specifically includes:
  • the UE triggers a two-step (2-step) random access procedure, which specifically includes:
  • Step 1 the UE sends a message A (Msg A) to the base station, where the MSG A includes the preamble and the payload of the MSG A.
  • the payload of MSG A carries the identifier of the UE, such as C-RNTI.
  • the C-RNTI is assembled into the C-RNTI MAC CE and sent to the base station in the payload of the MSGA.
  • a DCCH message may also be carried in the payload of the MSGA, and preferably, the message carries information about the arrival of data of the DRB that is not configured with SDT.
  • a DCCH message may also be a UE Assistance Information Message (UE Assistance Information Message).
  • the payload of message A also carries the data/MAC SDU from the logical channel identified as 1.
  • Step 2 the UE starts the message B response window timer msgB-ResponseWindow, and monitors the PDCCH channel.
  • the currently triggered random access procedure is triggered by the UE during the small data transmission process
  • the currently triggered random access procedure is triggered by the UE in the INACTIVE state
  • the C-RNTI MAC CE is included in the message A (or the transmission of the message A) of the currently triggered random access procedure;
  • the UE When all the following conditions are met, the UE considers that the triggered random access procedure is successfully completed (consider this Random Access procedure successfully completed).
  • Condition 4a When the UE receives the PDCCH scrambled by the UE's C-RNTI, or receives the PDCCH associated with the UE's C-RNTI, or receives the PDCCH transmission with the address of the C-RNTI (the PDCCH transmission is addressed to the C-RNTI);
  • Condition 4b The PDCCH satisfying Condition 4a indicates a downlink assignment.
  • Condition 4c The UE correctly decodes the corresponding or scheduled transport block of the downlink assignment.
  • the transport block contains a MAC PDU, and it can be considered that the UE has correctly decoded the MAC PDU contained in the downlink assignment.
  • the MAC PDU satisfying condition 4c contains indication information, which is used to confirm or indicate that the base station has received the message A sent by the UE in step 1, preferably, confirm or indicate that the base station has received the payload of the message A.
  • indication information can be carried in the MAC CE, such as defining a confirmation MAC CE (Confirmation MAC CE).
  • Another embodiment of the condition 4d may be: the MAC PDU satisfying the condition 4c includes the Confirmation MAC CE.
  • the UE when all the above conditions (4a-4d) are satisfied, the UE considers that the random access response is received successfully (consider this Random Access Response reception reception successful), and stops the running msgB-Response Window. And optionally, complete the disassembly and demultiplexing of the MAC PDU (finish the disassembly and demultiplexing of the MAC PDU).
  • the manner of how to determine that the currently triggered random access process is triggered by the UE during the small data transmission process is the same as that of the first embodiment.
  • the currently triggered random access procedure is triggered by the UE in a connected state (RRC connected), and preferably, is triggered by the MAC layer.
  • the currently triggered random access procedure is triggered by the RRC layer, then when one or more of the following conditions are met, the UE considers that the triggered random access procedure is successfully completed.
  • Condition 2a when the UE receives the PDCCH scrambled by the UE's C-RNTI, or in other words, receives the PDCCH associated with the UE's C-RNTI;
  • Condition 2b The PDCCH satisfying condition 2a indicates or contains an uplink grant for new transmission.
  • the UE considers that the random access response is received successfully, and stops the running msgB-ResponseWindow.
  • Such a supplementary situation can also be that, the message A of the currently triggered random access procedure does not carry a DCCH message or data/MAC SDU from the logical channel with the identifier 1, then when the above condition 2a is satisfied, the UE considers that the random access process is triggered. The access process completed successfully. Or when the above conditions 2a and 2b are satisfied, the UE considers that the triggered random access procedure is successfully completed.
  • the UE triggers a two-step (2-step) random access procedure, which specifically includes:
  • Step 1 the UE sends a message A (Msg A) to the base station, where the MSGA A includes the preamble and the payload of the MSGA.
  • the UE's identifier such as C-RNTI, is carried in the MSGA payload.
  • the C-RNTI is assembled into the C-RNTI MAC CE and sent to the base station in the payload of the MSGA.
  • a DCCH message may also be carried in the payload of the MSGA, and preferably, the message carries information about the arrival of data of the DRB that is not configured with SDT.
  • a DCCH message may also be a UE Assistance Information Message (UE Assistance Information Message).
  • the payload of message A also carries the data/MAC SDU from the logical channel identified as 1.
  • Step 2 the UE starts the message B response window timer msgB-ResponseWindow, and monitors the PDCCH channel.
  • the currently triggered random access procedure is triggered by the UE during the small data transmission process
  • the currently triggered random access procedure is triggered by the UE in the INACTIVE state
  • the C-RNTI MAC CE is included in the message A (or the transmission of the message A) of the currently triggered random access procedure;
  • the UE When all the following conditions are met, the UE considers the triggered random access procedure to be successfully completed.
  • Condition 3a When the UE receives the PDCCH scrambled by the UE's C-RNTI, or receives the PDCCH associated with the UE's C-RNTI; or receives the PDCCH transmission with the address of the C-RNTI (the PDCCH transmission is addressed to the C-RNTI);
  • the DCI carried in the PDCCH satisfying the condition 3a may adopt the DCI format for acknowledgement feedback.
  • the existing DCI format 1_0 can also be used, and the values of the frequency domain resource assignment fields of the DCI format 1_0 are all set to 1.
  • Such a DCI format 1_0 can be used for a triggered (initiated) random access procedure in a disconnected state, or a random access procedure triggered during small data transmission.
  • DCI format 0_1 can also be used, and the downlink feedback information flag (Downlink feedback Information flag) in it is set to 1, which is used to indicate the reception confirmation of message three.
  • the UE considers that the random access response is received successfully (consider this random access response response reception reception successful), and stops the running msgB-Response Window.
  • the manner of how to determine that the currently triggered random access process is triggered by the UE during the small data transmission process is the same as that of the first embodiment.
  • the currently triggered random access procedure is triggered by the UE in a connected state (RRC connected), and preferably, is triggered by the MAC layer.
  • the currently triggered random access procedure is triggered by the RRC layer, then when one or more of the following conditions are met, the UE considers that the triggered random access procedure is successfully completed.
  • Condition 2a when the UE receives the PDCCH scrambled by the UE's C-RNTI, or in other words, receives the PDCCH associated with the UE's C-RNTI;
  • Condition 2b The PDCCH satisfying condition 2a indicates or contains an uplink grant for new transmission.
  • the UE considers that the contention conflict is successfully resolved, and stops the running contention conflict timer.
  • Such a supplementary situation can also be that, the message A of the currently triggered random access procedure does not carry a DCCH message or data/MAC SDU from the logical channel with the identifier 1, then when the above condition 2a is satisfied, the UE considers that the random access process is triggered. The access process completed successfully. Or when the above conditions 2a and 2b are satisfied, the UE considers that the triggered random access procedure is successfully completed.
  • FIG. 6 is a schematic structural block diagram of the user equipment UE involved in the present invention.
  • the user equipment UE600 includes a processor 601 and a memory 602 .
  • the processor 601 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like.
  • the memory 602 may include, for example, volatile memory (eg, random access memory RAM), a hard disk drive (HDD), non-volatile memory (eg, flash memory), or other memory, or the like.
  • the memory 602 has program instructions stored thereon. When the instruction is executed by the processor 601, the above-mentioned method performed by the user equipment described in detail in the present invention can be executed.
  • a program running on a device may be a program that causes a computer to implement the functions of the embodiments of the present invention by controlling a central processing unit (CPU).
  • the program or information processed by the program may be temporarily stored in volatile memory (eg, random access memory RAM), a hard disk drive (HDD), non-volatile memory (eg, flash memory), or other memory systems.
  • a program for realizing the functions of the embodiments of the present invention can be recorded on a computer-readable recording medium.
  • the corresponding functions can be realized by causing a computer system to read programs recorded on the recording medium and execute the programs.
  • the so-called "computer system” as used herein may be a computer system embedded in the device, and may include an operating system or hardware (eg, peripheral devices).
  • the "computer-readable recording medium” may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium that dynamically stores a program for a short period of time, or any other recording medium readable by a computer.
  • circuits eg, monolithic or multi-chip integrated circuits.
  • Circuits designed to perform the functions described in this specification may include general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above.
  • DSPs digital signal processors
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • a general-purpose processor may be a microprocessor or any existing processor, controller, microcontroller, or state machine.
  • the above circuit may be a digital circuit or an analog circuit. In the event that new integrated circuit technologies emerge as a result of advances in semiconductor technology that replace existing integrated circuits, one or more embodiments of the present invention may also be implemented using these new integrated circuit technologies.
  • the present invention is not limited to the above-described embodiments. Although various examples of the described embodiments have been described, the invention is not limited thereto.
  • Fixed or non-mobile electronic equipment installed indoors or outdoors can be used as terminal equipment or communication equipment, such as AV equipment, kitchen equipment, cleaning equipment, air conditioners, office equipment, vending machines, and other household appliances.

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Abstract

本发明的目的在于提供一种确定随机接入过程是否成功的方法以及用户设备。该方法包括：向基站发送用于随机接入过程的特定交互消息，所述特定交互消息携带所述用户设备的标识；启动定时器；确认是否在所述定时器运行期间接收到了由基站指示的包括确认消息的指示消息，所述确认消息表示所述基站接收到了所述特定交互消息；以及在满足特定情况时，当在所述定时器运行期间接收到了所述确认消息时，确定所述随机接入过程已成功完成。

Description

确定随机接入过程是否成功的方法以及用户设备 技术领域
本发明涉及无线通信技术领域，更具体地，本发明涉及确定随机接入过程是否成功的方法以及相应的用户设备。
背景技术
为了缩短传输时延，以及节约信令开销，进入RRC非激活态(RRC INACTIVE STATE)的UE可以在预先配置的上行资源(preconfigured Uplink Resource，PUR)上发送既定大小的、携带数据的传输块(Transport Block)。这种传输方式可以称为PUR传输。还可以在随机接入的过程中，在消息三或者消息A中发送携带用户数据的传输块。这两种方式都可以被称为小数据传输。
在小数据传输过程中，由于新的数据到达，UE可以触发随机接入过程，向网络侧/基站报告这一信息，以获得网络侧/基站进一步的调度。
在现有的随机接入过程中，当UE接收到以C-RNTI加扰的PDCCH，或者是接收到以C-RNTI加扰的PDCCH并在该PDCCH中指示了上行授权(UL grant)时，可以认为这一随机接入过程成功完成。
当时在小数据传输过程中，UE可能接收到的以C-RNTI加扰的PDCCH，但是这样的PDCCH是用于小数据传输的，而非基站/网络对随机接入过程的响应，从而会对正在进行的随机接入过程的判断造成混淆因此，如何在一个小数据传输过程中判断触发的随机接入成功完成，是需要解决的问题。
发明内容
针对现有技术中的上述问题，本发明的目的在于提供一种确定随机接入过程是否成功的方法以及用户设备。
根据本发明的一个方面，提供一种由用户设备执行的确定随机接入过程是否成功的方法，包括：向基站发送用于随机接入过程的特定交互消息，所述特定交互消息携带所述用户设备的标识；启动定时器；确认是否在所述定时器运行期间接收到了由基站指示的包括确认消息的指示消息，所述确认消息表示所述基站接收到了所述特定交互消息；以及在满足特定情况时，当在所述定时器运行期间接收到了所述确认消息时，确定所述随机接入过程已成功完成。
可选地，所述特定情况包括以下中的至少一者：当前触发的随机接入过程是所述用户设备是在小数据传输过程中触发的；当前触发的随机接入过程是所述用户设备在非激活态下触发的；在当前触发的随机接入过程是由MAC层触发的；在当前触发的随机接入过程的所述特定交互消息中携带了DCCH消息；在当前触发的随机接入过程的所述特定交互消息中携带了来自标识为1的逻辑信道的数据/MAC SDU。
可选地，在满足以下的至少一个条件时，确定满足当前触发的随机接入过程是UE在小数据传输过程中触发的情况：与所述小数据传输关联的定时器正在运行；在触发当前的随机接入过程之前的给定时间内接到了来自上层的关于进行小数据传输的指示；所述用户设备处于非激活态，但能够进行用户数据的传输。
可选地，向基站发送用于随机接入过程的特定交互消息采用第一特定交互消息发送过程或第二特定交互消息发送过程来实现。所述第一特定交互消息发送过程可以包括：向所述基站发送前导序列；接收所述基站针对所述前导序列而发送的随机接入响应；以及在接收到所述随机接入响应时，向所述基站发送所述特定交互消息。所述第二特定交互消息发送过程可以包括：向所述基站发送包括前导序列和所述特定交互消息的承载的所述特定交互消息，所述特定交互消息的承载包括所述用户设备的标识。
可选地，确认是否在所述定时器运行期间接收了到由基站指示的包括确认消息的指示消息采用第一确认过程或第二确认过程来实现。所述第一确认过程可以包括：在监听到与所述用户设备的标识关联的PDCCH时，确定所监听到的PDCCH是否指示了下行指派；如果所监听到的 PDCCH指示了下行指派，则对所述下行指派中指示的传输块进行解码；以及如果正确解码了所述下行指派，则确定所述传输块中是否包括所述指示消息，以确定是否接收到了所述指示消息。所述第二确认过程可以包括：在监听到与所述用户设备的标识关联的PDCCH时，确认所述PDCCH中是否携带了采用用于确定反馈的DCI格式的DCI；以及在PDCCH中携带了采用用于确定反馈的DCI格式的DCI时，确认接收到了所述指示消息。
可选地，所述指示消息包括MAC CE。
可选地，所述方法还包括：在确定所述随机接入过程已成功完成时，停止运行用于随机接入的竞争冲突定时器。
可选地，所述DCI格式是用于触发小数据传输过程中的随机接入过程或用于在非激活态下触发随机接入过程的DCI格式。
可选地，所述特定交互消息还携带以下中的至少一者：DCCH消息；未被配置SDT的DRB的数据到达消息；来自标识为1的逻辑信道的数据或MAC SDU。
根据本发明的另一方面，还提供一种用户设备，包括：处理器；以及存储器，存储有指令，其中，所述指令在由所述处理器运行时执行根据权利要求上述方法。
根据本发明，能够准确地确定随机接入是否成功完成。
附图说明
图1是用于说明本发明涉及的四步随机接入过程的流程图。
图2是用于说明本发明涉及的两步随机接入过程的流程图。
图3是用于说明本发明涉及的确定随机接入过程是否成功的方法的流程图。
图4是用于说明本发明涉及的确定随机接入过程是否成功的方法中的第一确认过程的流程图。
图5是用于说明本发明涉及的确定随机接入过程是否成功的方法中的第二确认过程的流程图。
图6用于说明本发明涉及的用户设备的结构框图。
具体实施方式
下面结合附图和具体实施方式对本发明进行详细阐述。应当注意，本发明不应局限于下文所述的具体实施方式。另外，为了简便起见，省略了对与本发明没有直接关联的公知技术的详细描述，以防止对本发明的理解造成混淆。
在具体描述之前，先对本发明中提到的若干术语做如下说明。除非另有指出，本发明中涉及的术语都具有下文的含义：
UE  User Equipment用户设备
NR  New Radio新一代无线技术
LTE  Long Term Evolution长期演进技术
eLTE  Enhaced Long Term Evolution增强的长期演进技术
RRC  Radio Resource Control无线资源控制(层)
MAC  Medium Access Control媒体接入控制(层)
MAC CE  MAC Control Element MAC控制元素
C-RNTI  Cell Radio Network Temporary Identifier小区无线网络临时标识
C-RNTI  MAC CE Cell Radi o Network Temporary Identifier MAC Control Element小区无线网络临时标识MAC控制元素
PDCCH  Physical Downlink Control Channel物理下行控制信道
PUSCH  Physical Uplink Service Channel物理上行业务信道
PRACH  Physical Random Access Channel物理随机接入信道
LCID  Logical Channle Identity逻辑信道身份标识
PDU  Protocol Data Unit协议数据单元
SDU  Service Data Unit服务数据单元
RLC  Radio Link Control无线链路层控制协议(层)
PDCP  Packet Data Convergence Protoco分组数据汇聚协议(层)
MAC SDU  MAC Protocol Data Unit，MAC服务数据单元
MAC PDU  MAC Protocol Data Unit，MAC协议数据单元
DCI  Downlink Control Information下行控制信息
DCCH  Dedicated Control Channel专有控制信道
DRB  Data Radio Bear数据无线承载
SRB  Signaling Radio Bear信令无线承载
SDT  Small Data Transmission小数据传输
下文以NR移动通信系统及其后续的演进版本作为示例应用环境，以支持NR的基站和UE设备为例，具体描述了根据本发明的多个实施方式。然而，需要指出的是，本发明不限于以下实施方式，而是可适用于更多其它的无线通信系统，例如eLTE、通信系统，或者是NB-Iot系统，又或者是LTE-M系统。而且可以适用于其他基站和UE设备，例如支持eLTE/NB-Iot/LTE-M的基站和UE设备。
小数据的传输
本文中小数据主要是指数据或者携带这些数据的包(例如携带这些数据的MAC PDU/RLC PDU/PDCP PDU)的大小不超过既定的值。这个值可以是基站或者网络侧在系统信息中进行广播。当UE判定要发送的数据或者数据包的大小不超过该值时，UE可以通过随机接入过程直接发送给基站或者网络侧，而不需要通过先进入RRC连接态，然后再进行数据传输这一过程。这里的数据类型主要是指用户面的数据(User Plane data，UP data)。控制面的数据(control Plane data，CP data)也可以借助这种方法进行传输。
本说明书中涉及的随机接入过程包括四步随机接入过程和两步随机接入过程。以下参照图1和图2来进行说明。
四步随机接入过程(4step Random Access procedure，4-step RA)
图1是用于说明本发明涉及的四步随机接入过程的流程图。
如图1所示，UE执行的4步随机接入过程包含下述步骤：
步骤S100：UE选定用于随机接入的随机接入资源。在这一过程中：
-UE选定了用于发送的前导序列(preamble)，将选定的preamble对应的序号设置为参数PREAMBLE_INDEX的值；以及
-在多个PRACH时机(PRACH occassions)中确定下一个可以用于传输的PRACH时机(determine the next available PRACH  occasion from the PRACH occasions)，
步骤S101：UE在确定的PRACH时机上发送选定的preamble。
步骤S102：UE接收基站侧发来的随机接入响应(Random Access Response，RAR)。
如果在这个RAR中携带了UE在步骤S101中发送的preamble对应的序号(preamble index id)，那么UE可以确定该RAR是发送给自己的。在这样的RAR中会携带UL grant。该UL grant指示了用于传输消息三的PUSCH资源。
当接收到上述的RAR之后，UE会处理RAR中携带的UL grant，并将它指示给下层。如果这是UE第一次成功的接收到上述RAR，那么UE从复用和组装实体(Multiplexing and assembly entity)中获取(obtain)用于发送的MAC PDU，并将它保存在消息三的缓存区(MSG3 buffer)中。
步骤S103：UE在UL grant指示的PUSCH资源上发送消息三。
在这个消息三中，UE会携带用于竞争冲突解决的标识信息。
步骤S104：UE接收基站侧发送来的消息四。
在消息四中如果携带了UE在消息三中携带的标识信息，那么UE认为竞争冲突解决，随机接入过程成功完成。
由于在上述随机接入过程中UE经历了步骤S101～S104的消息传递过程，因此被称为“四步随机接入”(4-step RA)过程。
上述四步随机接入过程还可以被称为是第一类型的层1随机接入(Type-1 layer 1 Random Access Procedure，type 1 L1 RA)。从物理层(又称为层1，layer 1)的角度来看，type 1 L1 RA过程至少包含了在PRACH上传输随机接入前导序列(或者称为消息一的传输)，以及随机接入响应消息(Random Access Response Message)的传输/接收，这个随机接入响应消息的传输是由PDCCH调度的，并且是在PDSCH上传输的；此外，在type 1 L1 RA过程中还可以包含随机接入响应中携带的上行授权所调度的PUSCH，以及随之而来的用于竞争冲突解决(contention resolution)的PDSCH。
两步随机接入过程(2step Random Access procedure，2-step RA)
图2是用于说明本发明涉及的 两步随机接入过程的流程图。
如图2所示，两步随机接入过程为：
步骤S200：UE选定用于随机接入的随机接入资源。在这一过程中
-UE选定了用于发送的前导序列(preamble)，将选定的preamble对应的序号设置为参数PREAMBLE_INDEX的值；以及
-在多个PRACH时机(PRACH occassions)中确定下一个可以用于传输的PRACH时机(determine the next available PRACH occasion from the PRACH occasions)，以及
-确定对应于该前导序列的PUSCH资源。
步骤S201：UE向基站发送消息A(MSG A)。
其中，消息A包含preamble和消息A的负载(payload)。
其中，preamble在PRACH上发送，消息A的payload在PUSCH上发送。消息A的payload是被包装成MAC PDU在PUSCH上传输。当UE确定了用于发送消息A的时机时，如果这是UE第一次发送MSG A，那么UE从复用和组装实体(Multiplexing and assembly entity)中获取(obtain)用于发送的MAC PDU，并将它保存在消息A的缓存区(MSGA buffer)中。
步骤S202：UE接收基站发送的消息B(MSG B)。
其中消息B携带了用于竞争冲突解决的信息。
为了解决现有技术中存在的问题，以下，详细描述本发明的若干实施例，以下的实施例仅仅是为了容易理解本发明而提供的示例，并不是对本发明的限定。
首先对本发明的方法进行整体性说明。 图3是用于说明本发明涉及 的确定随机接入过程是否成功的方法的流程图。
如图3所示，在S301中，向基站发送用于随机接入过程的特定交互消息，该特定交互消息携带用户设备的标识。可以采用图1所示的四步随机接入过程来发送特定交互消息，此时特定交互消息可以对应于四步随机接入过程中的消息三。也可以采用图2所示的两步随机接入过程 来发送特定交互消息，此时特定交互消息可以对应于两步随机接入过程中的消息A。
在S302中，启动定时器。在采用四步随机接入过程时，该定时器可以是后面描述的竞争冲突定时器，在采用两步随机接入过程时，该定时器可以是后面描述的消息B响应窗口定时器。
然后，在S303中，确定是否收到了由基站指示的包括确认消息的指示消息，该确认消息表示基站接收到了特定交互消息。如果接收到了指示消息，则在S304中，确定是否满足特定情况。关于特定情况的描述参照后文。如果满足特定情况，则在S306，确定随机接入过程已成功完成。
如果在S303中未接收到指示消息，则或在S304中确定不满足特定情况，则在S305，判断定时器是否已期满。如果定时器未期满，则回到S303，继继进行指示消息的接收和特定情况满足与否的确定操作。
本发明的方法并不限于图3所示的顺序，例如，也可以首先确定是否满足特定情况，在确定满足特定情况时确定是否接收到了指示消息。指示消息例如可以是后文所描述的MAC CE或特定DCI格式的DCI。
对是否接收到指示消息的确定操作可以采用第一确定过程或第二确定过程来实现。以下参照图4和图5来说明第一确定过程和第二确定过程。
图4是用于说明本发明涉及的确定随机接入过程是否成功的方法中的第一确认过程的流程图。如图4所示，在S401，监听与用户设备的标识关联的PDCCH。在S402，确定是否监听到了关联PDCCH。如果监听到了与用户设备的标识关联的PDCCH，则在S403，确定所监听到的PDCCH是否指示了下行指派。
如果所监听到的PDCCH是否指示了下行指派，则在S404，对该下行指派进行解码，并在S405确定是否成功解码了该下行指派。如果成功解码了该下行指派，则在S406，确定该下行指派是否包括上述指示消息。如果包括指示消息，则在S407，确定随机接入过程已成功完成。
在S402、S403、S405、S406的确认结果为否时，在S408，确定定时器是否期满，如果定时器仍处于运行期间，则返回S401，继续监听关 联PDCCH，如果定时器已期满，则结束第一确定过程。
图5是用于说明本发明涉及的确定随机接入过程是否成功的方法中的第二确认过程的流程图。
如图5所示，在S501，监听与用户设备的标识关联的PDCCH，并在S502，确定是否监听到了关联PDCCH。在监听到与用户设备的标识关联的PDCCH时，在S503，确定所监听到的PDCCH是否携带了特定DCI格式的DCI，例如采用用于确定反馈的DCI格式的DCI。如果在PDCCH中携带了特定DCI格式的DCI时，则在S504，确认接收到了指示消息。
在S502、S503的确认结果为否时，在S505，确定定时器是否期满，如果定时器仍处于运行期间，则返回S501，继续监听关联PDCCH，如果定时器已期满，则结束第二确定过程。
以下举出具体的例子来说明本发明。
实施例一
UE触发4步随机接入过程，具体包括：
步骤一，UE向基站发送前导序列(preamble)
步骤二，UE接收基站发送随机接入响应(Random Access Response，RAR)
步骤三，UE向基站发送消息三，这里的消息三是UE和基站交互的第三条消息，所以被称为消息三，步骤一和二中交互的消息可以分别被称为消息一和消息二。
在消息三中携带了UE的标识，例如C-RNTI。C-RNTI被组装进C-RNTI MAC CE，携带在消息三中发送给基站。用于发送消息三的上行资源，由在步骤二接收到的RAR中指示。
可选的，在消息三中还可以携带DCCH消息，优选的，在该消息中携带了没有被配置SDT的DRB的数据到达的信息。这样的DCCH消息还可以是UE辅助信息消息(UE Assistance Information Message)。又或者在消息三中还携带了来自标识为1的逻辑信道(LCID取值为1)的数据/MAC SDU。
步骤四，UE启动竞争冲突定时器，在该定时器运行期间，监听 (monitor)下行PDCCH信道。所谓监听，是指UE接收下行PDCCH，检测该PDCCH是否是由UE的标识加扰(Scrambled)，如果是，则表示该PDCCH上携带的信息，例如DCI是发送给该UE的，如果不是，则表明该PDCCH上携带的信息不是发送给该UE的，UE可以忽略接收到的PDCCH。
在下述情况发生之一或多时(对应于本发明中的“特定情况”)，确
定是否满足以下的条件1a～1d：
-当前触发的随机接入过程是UE在小数据传输过程中触发；
-当前触发的随机接入过程是UE在非激活态(INACTIVE state)下触发的；
-在当前触发的随机接入过程是由MAC层触发的；
-在当前触发的随机接入过程的消息三中携带了C-RNTI MAC CE；
-在当前触发的随机接入过程的消息三中携带了一个DCCH消息；
-在当前触发的随机接入过程的消息三中携带了来自标识为1的逻辑信道的数据/MAC SDU。
是否满足上述特定情况，可以根据前述步骤三中消息三中所携带的信息来确定。
当满足下述所有条件时，UE认为被触发随机接入过程成功完成(consider this Random Access procedure successfully completed)。
条件1a：UE接收到由UE的C-RNTI加扰的PDCCH时，或者说是接收到与该UE的C-RNTI关联的PDCCH；或者说是接收到地址为C-RNTI的PDCCH传输(the PDCCH transmission is addressed to the C-RNTI)
条件1b：满足条件1a的PDCCH指示了一个下行指派(downlink assignment)。
条件1c：UE正确解码了这个下行指派中指示的传输块。传输块中包含了一个MAC PDU，可以认为UE正确解码了这个下行指派包含的MAC PDU。
条件1d：满足条件1c中的MAC PDU里包含了指示信息，用于指 示基站接收到了UE在步骤三中发送的消息三。这样的指示信息可以是携带在MAC CE中，例如定义一个确认MAC CE(Confirmation MAC CE)。条件1d的又一实施方式可以是：满足条件1c中的MAC PDU里包含了所述的Confirmation MAC CE。
可选的，当满足上述所有条件(1a-1d)时，UE认为竞争冲突解决成功(consider this Contention Resolution successful)，以及停止运行的竞争冲突定时器(stop ra-ContentionResolutionTimer)，还可以完成上述MAC PDU的去组装以及去复用操作(finish the disassembly and demultiplexing of the MAC PDU)。
其中，如何判断当前触发的随机接入过程是UE在小数据传输过程中触发？例如，在触发当前随机接入过程时，和小数据传输相关联的定时器或者用于小数据传输管理的定时器正在运行，那么UE可以确定当前触发的随机接入过程是UE在小数据传输过程中触发；又例如，在当前被触发的随机接入过程之前曾经收到过来自上层(例如RRC层)的、关于触发或者进行小数据传输的指示，那么UE可以确定当前触发的随机接入过程是UE在小数据传输过程中触发。这样的指示可以是在给定时间内接收到的，例如在当前随机接入过程被触发之前的X毫秒内接收到了触发小数据传输的指示，X的取值可以是1-10。又例如RRC层在触发小数据传输时会启动一个定时器，这个定时器可以用于小数据传输失败的检测，或者是控制/管理小数据传输过程的定时器。在这个定时器运行期间，如果UE触发了当前的随机接入过程，那么可以确定当前触发的随机接入过程是UE在小数据传输过程中触发。又例如，UE处于非激活态(INACTIVE)，或者没有处于连接态，但是UE能够进行用户数据的传输，这就表示UE处于小数据传输的过程中。
作为补充，在另外一种情况下，当前触发的随机接入过程是UE在连接态(RRC Connected State)或者激活态下触发，以及优选的，是MAC层层触发的。又或者当前触发的随机接入过程是由RRC层触发的，那么当满足下述条件之一或者多时，UE认为被触发随机接入过程成功完成。
条件2a：UE接收到由UE的C-RNTI加扰的PDCCH时，或者说是接收到与该UE的C-RNTI关联的PDCCH；
条件2b：满足条件2a的PDCCH指示了或者包含了用于新传(new transmission)的上行授权。
可选的，当满足上述所有条件(2a-2b)时，UE认为竞争冲突解决成功，以及停止运行的竞争冲突定时器。
这样的补充情况还可以是，当前触发的随机接入过程的消息三中没有携带DCCH消息或者来自标识为1的逻辑信道的数据/MAC SDU，那么当满足上述条件2a时，UE认为被触发随机接入过程成功完成。或者当满足上述条件2a和2b时，UE认为被触发随机接入过程成功完成。
实施例二
和实施例一的区别在于判断随机接入成功完成的条件不同，具体实施方式如下：
UE触发随机接入过程，具体包括：
步骤一，UE向基站发送preamble。
步骤二，UE接收基站发送随机接入响应(RAR)。
步骤三，UE向基站发送消息三，这里的消息三是UE和基站交互的第三条消息，所以被称为消息三。在消息三中携带了UE的标识，例如C-RNTI。C-RNTI被组装进C-RNTI MAC CE，携带在消息三中发送给基站。用于发送消息三的上行资源，由在步骤二接收到的RAR中指示。
可选的，在消息三中还可以携带DCCH消息，优选的，在该消息中携带了没有被配置SDT的DRB的数据到达的信息。这样的DCCH消息还可以是UE辅助信息消息(UE Assistance Information Message)。又或者在消息三中还携带了来自标识为1的逻辑信道的数据/MAC SDU。
步骤四，UE启动竞争冲突定时器，在该定时器运行期间，监听(monitor)PDCCH信道。
在下述情况之一或多时，确定是否满足以下的条件3a～3b：
-当前触发的随机接入过程是UE在小数据传输过程中触发；
-当前触发的随机接入过程是UE在非激活态下触发的；
-在当前触发的随机接入过程是由MAC层触发的；
-在当前触发的随机接入过程的消息三中携带了C-RNTI MAC CE；
-
-在当前触发的随机接入过程的消息三中携带了DCCH消息；
-在当前触发的随机接入过程的消息三中携带了来自标识为1的逻辑信道的数据/MAC SDU。
是否满足上述特定情况，可以根据前述步骤三中消息三中所携带的信息来确定。
当满足下述所有条件时，UE认为被触发随机接入过程成功完成。
条件3a：UE接收到由UE的C-RNTI加扰的PDCCH时，或者说是接收到与该UE的C-RNTI关联的PDCCH；或者说是接收到地址为C-RNTI的PDCCH传输(the PDCCH transmission is addressed to the C-RNTI)
条件3b：满足条件3a的PDCCH中携带的DCI可以采用用于确认反馈(acknowledge feedback)的DCI格式(DCI format)。可以采用现有的DCI format 1_0，并且将DCI format 1_0的频域资源指派fields的取值全部设置为1。这样的DCI format 1_0可以用于非连接态下的触发的(initiated)随机接入过程，或者说是用于小数据传输过程中触发的随机接入过程。还可以采用DCI format 0_1，设置其中的下行反馈信息标识(Downlink feedback Information flag)为1，用于指示对消息三的接收确以。
可选的，当满足上述所有条件(3a和3b)时，UE认为竞争冲突解决成功(consider this Contention Resolution successful)，以及停止运行的竞争冲突定时器(stop ra-ContentionResolutionTimer)。
作为补充，在另外一种情况下，当前触发的随机接入过程是UE在 连接态(RRC Connected State)或者激活态下触发，以及优选的，是MAC层层触发的。又或者当前触发的随机接入过程是由RRC层触发的，那么当满足下述条件之一或者多时，UE认为被触发随机接入过程成功完成。
条件2a：UE接收到由UE的C-RNTI加扰的PDCCH时，或者说是接收到与该UE的C-RNTI关联的PDCCH；
条件2b：满足条件2a的PDCCH指示了或者包含了用于新传(new transmission)的上行授权。
可选的，当满足上述条件(2a-2b)时，UE认为竞争冲突解决成功，以及停止运行的竞争冲突定时器。
这样的补充情况还可以是，当前触发的随机接入过程的消息三中没有携带DCCH消息或者来自标识为1的逻辑信道的数据/MAC SDU，那么当满足上述条件2a时，UE认为被触发随机接入过程成功完成。或者当满足上述条件2a和2b时，UE认为被触发随机接入过程成功完成。
实施例三
和实施例一的区别在于UE触发了一个两步骤随机接入过程，具体包括：
UE触发两步骤(2-step)随机接入过程，具体包括：
步骤一，UE向基站发送消息A(Msg A)，其中MSG A包括preamble以及MSG A的承载(payload)。在MSG A的payload中携带了UE的标识，例如C-RNTI。C-RNTI被组装进C-RNTI MAC CE，携带在MSGA的payload中发送给基站。
可选的，在MSGA的payload中还可以携带DCCH消息，优选的，在该消息中携带了没有被配置SDT的DRB的数据到达的信息。这样的DCCH消息还可以是UE辅助信息消息(UE Assistance Information Message)。又或者在消息A的payload中还携带了来自标识为1的逻辑信道的数据/MAC SDU。
步骤二，UE启动消息B响应窗口定时器msgB-ResponseWindow，监听(monitor)PDCCH信道。
在下述情况发生之一或多时，确定是否满足以下的条件4a～4d：
-当前触发的随机接入过程是UE在小数据传输过程中触发；
-当前触发的随机接入过程是UE在非激活态(INACTIVE state)下触发的，
-在当前触发的随机接入过程是由MAC层触发的；
-在当前触发的随机接入过程的消息A(或者消息A的传输)中包含了C-RNTI MAC CE；
-
-在当前触发的随机接入过程的消息A中携带了DCCH消息；
-在当前触发的随机接入过程的消息A中携带了来自标识为1的逻辑信道的数据/MAC SDU。
是否满足上述特定情况，可以根据前述步骤一中消息A中所携带的信息来确定。
当满足下述所有条件时，UE认为被触发随机接入过程成功完成(consider this Random Access procedure successfully completed)。
条件4a：UE接收到由UE的C-RNTI加扰的PDCCH时，或者说是接收到与该UE的C-RNTI关联的PDCCH，或者说是接收到地址为C-RNTI的PDCCH传输(the PDCCH transmission is addressed to the C-RNTI)；
条件4b：满足条件4a的PDCCH指示了一个下行指派(downlink assignment)。
条件4c：UE正确解码了这个下行指派对应的或者调度的传输块(transport block)。传输块中包含了一个MAC PDU，可以认为UE正确解码了这个下行指派包含的MAC PDU。
条件4d：满足条件4c中的MAC PDU里包含了指示信息，用于确认或者指示基站接收到了UE在步骤一中发送的消息A，优选的，确认或者指示基站接收到了消息A的payload。这样的指示信息可以是携带在MAC CE中，例如定义一个确认MAC CE(Confirmation MAC CE)。条件4d的又一实施方式可以是：满足条件4c中的MAC PDU里包含了 Confirmation MAC CE。
可选的，当满足上述所有条件(4a-4d)时，UE认为随机接入响应接收成功(consider this Random Access Response reception successful)，以及停止正在运行的msgB-Response Window。以及可选的，完成MAC PDU的去组装(disassembly)和解复用(demultiplexing)(finish the disassembly and demultiplexing of the MAC PDU)。
其中，如何判断当前触发的随机接入过程是UE在小数据传输过程中触发的方式和实施例一相同。
作为补充，在另外一种情况下，当前触发的随机接入过程是UE在连接态(RRC connected)下触发，以及优选的，是MAC层触发的。又或者当前触发的随机接入过程是由RRC层触发的，那么当满足下述条件之一或者多时，UE认为被触发随机接入过程成功完成。
条件2a：UE接收到由UE的C-RNTI加扰的PDCCH时，或者说是接收到与该UE的C-RNTI关联的PDCCH；
条件2b：满足条件2a的PDCCH指示了或者包含了用于新传(new transmission)的上行授权。
可选的，当满足上述所有条件(2a-2b)时，UE认为随机接入响应接收成功，以及停止运行的msgB-ResponseWindow.
这样的补充情况还可以是，当前触发的随机接入过程的消息A中没有携带DCCH消息或者来自标识为1的逻辑信道的数据/MAC SDU，那么当满足上述条件2a时，UE认为被触发随机接入过程成功完成。或者当满足上述条件2a和2b时，UE认为被触发随机接入过程成功完成。
实施例四
UE触发两步骤(2-step)随机接入过程，具体包括：
步骤一，UE向基站发送消息A(Msg A)，其中MSG A包括preamble以及MSGA的承载(payload)。在MSGA的payload中携带了UE的标识，例如C-RNTI。C-RNTI被组装进C-RNTI MAC CE，携带在MSGA 的payload中发送给基站。
可选的，在MSGA的payload中还可以携带DCCH消息，优选的，在该消息中携带了没有被配置SDT的DRB的数据到达的信息。这样的DCCH消息还可以是UE辅助信息消息(UE Assistance Information Message)。又或者在消息A的payload中还携带了来自标识为1的逻辑信道的数据/MAC SDU。
步骤二，UE启动消息B响应窗口定时器msgB-ResponseWindow，监听(monitor)PDCCH信道。
在下述情况发生之一或多时，确定是否满足以下的条件3a～3b：
-当前触发的随机接入过程是UE在小数据传输过程中触发；
-当前触发的随机接入过程是UE在非激活态(INACTIVE state)下触发的；
-在当前触发的随机接入过程是由MAC层触发的；
-在当前触发的随机接入过程的消息A(或者消息A的传输)中包含了C-RNTI MAC CE；
-
-在当前触发的随机接入过程的消息A中携带了DCCH消息；
-在当前触发的随机接入过程的消息A中携带了来自标识为1的逻辑信道的数据/MAC SDU。
是否满足上述特定情况，可以根据前述步骤一中消息A中所携带的信息来确定。
当满足下述所有条件时，UE认为被触发随机接入过程成功完成(successfully completed)。
条件3a：UE接收到由UE的C-RNTI加扰的PDCCH时，或者说是接收到与该UE的C-RNTI关联的PDCCH；或者说是接收到地址为C-RNTI的PDCCH传输(the PDCCH transmission is addressed to the C-RNTI)；
条件3b：满足条件3a的PDCCH中携带的DCI可以采用用于确认 反馈(acknowledge feedback)的DCI format。还可以采用现有的DCI format 1_0，并且将DCI format 1_0的频域资源指派fields的取值全部设置为1。这样的DCI format 1_0可以用于非连接态下的触发的(initiated)随机接入过程，或者用于小数据传输过程中触发的随机接入过程。还可以采用DCI format 0_1，设置其中的下行反馈信息标识(Downlink feedback Information flag)为1，用于指示对消息三的接收确认。
可选的，当满足上述所有条件(3a和3b)时，UE认为随机接入响应接收成功(consider this random access response reception successful)，以及停止正在运行的msgB-Response Window。
其中，如何判断当前触发的随机接入过程是UE在小数据传输过程中触发的方式和实施例一相同。
作为补充，在另外一种情况下，当前触发的随机接入过程是UE在连接态(RRC connected)下触发，以及优选的，是MAC层层触发的。又或者当前触发的随机接入过程是由RRC层触发的，那么当满足下述条件之一或者多时，UE认为被触发随机接入过程成功完成。
条件2a：UE接收到由UE的C-RNTI加扰的PDCCH时，或者说是接收到与该UE的C-RNTI关联的PDCCH；
条件2b：满足条件2a的PDCCH指示了或者包含了用于新传(new transmission)的上行授权。
可选的，当满足上述所有条件(2a-2b)时，UE认为竞争冲突解决成功，以及停止运行的竞争冲突定时器。
这样的补充情况还可以是，当前触发的随机接入过程的消息A中没有携带DCCH消息或者来自标识为1的逻辑信道的数据/MAC SDU，那么当满足上述条件2a时，UE认为被触发随机接入过程成功完成。或者当满足上述条件2a和2b时，UE认为被触发随机接入过程成功完成。
实施例五
参照图6对本公开的用户设备UE进行简单说明。图6是本发明涉及的用户设备UE的简要结构框图。如图6所示，该用户设备UE600包括处理器601和存储器602。处理器601例如可以包括微处理器、微控制器、嵌入式处理器等。存储器602例如可以包括易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器等。存储器602上存储有程序指令。该指令在由处理器601运行时，可以执行本发明详细描述的用户设备执行的上述方法。
运行在根据本发明的设备上的程序可以是通过控制中央处理单元(CPU)来使计算机实现本发明的实施例功能的程序。该程序或由该程序处理的信息可以临时存储在易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器系统中。
用于实现本发明各实施例功能的程序可以记录在计算机可读记录介质上。可以通过使计算机系统读取记录在所述记录介质上的程序并执行这些程序来实现相应的功能。此处的所谓“计算机系统”可以是嵌入在该设备中的计算机系统，可以包括操作系统或硬件(如外围设备)。“计算机可读记录介质”可以是半导体记录介质、光学记录介质、磁性记录介质、短时动态存储程序的记录介质、或计算机可读的任何其他记录介质。
用在上述实施例中的设备的各种特征或功能模块可以通过电路(例如，单片或多片集成电路)来实现或执行。设计用于执行本说明书所描述的功能的电路可以包括通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、或其他可编程逻辑器件、分立的门或晶体管逻辑、分立的硬件组件、或上述器件的任意组合。通用处理器可以是微处理器，也可以是任何现有的处理器、控制器、微控制器、或状态机。上述电路可以是数字电路，也可以是模拟电路。因半导体技术的进步而出现了替代现有集成电路的新的集成电路技术的情况下，本发明的一个或多个实施例也可以使用这些新的集成电路技术来实 现。
此外，本发明并不局限于上述实施例。尽管已经描述了所述实施例的各种示例，但本发明并不局限于此。安装在室内或室外的固定或非移动电子设备可以用作终端设备或通信设备，如AV设备、厨房设备、清洁设备、空调、办公设备、自动贩售机、以及其他家用电器等。
如上，已经参考附图对本发明的实施例进行了详细描述。但是，具体的结构并不局限于上述实施例，本发明也包括不偏离本发明主旨的任何设计改动。另外，可以在权利要求的范围内对本发明进行多种改动，通过适当地组合不同实施例所公开的技术手段所得到的实施例也包含在本发明的技术范围内。此外，上述实施例中所描述的具有相同效果的组件可以相互替代。

Claims (10)

  1. 一种由用户设备执行的确定随机接入过程是否成功的方法，包括：
    向基站发送用于随机接入过程的特定交互消息，所述特定交互消息携带所述用户设备的标识；
    启动定时器；
    确认是否在所述定时器运行期间接收到了由基站指示的包括确认消息的指示消息，所述确认消息表示所述基站接收到了所述特定交互消息；以及
    在满足特定情况时，当在所述定时器运行期间接收到了所述确认消息时，确定所述随机接入过程已成功完成。
  2. 根据权利要求1所述的方法，其中，所述特定情况包括以下中的至少一者：
    当前触发的随机接入过程是所述用户设备是在小数据传输过程中触发的；
    当前触发的随机接入过程是所述用户设备在非激活态下触发的；
    在当前触发的随机接入过程是由MAC层触发的；
    在当前触发的随机接入过程的所述特定交互消息中携带了DCCH消息；
    在当前触发的随机接入过程的所述特定交互消息中携带了来自标识为1的逻辑信道的数据/MAC SDU。
  3. 根据权利要求2所述的方法，其中，在满足以下的至少一个条件时，确定满足当前触发的随机接入过程是UE在小数据传输过程中触发的情况：
    与所述小数据传输关联的定时器正在运行；
    在触发当前的随机接入过程之前的给定时间内接到了来自上层的关于进行小数据传输的指示；
    所述用户设备处于非激活态，但能够进行用户数据的传输。
  4. 根据权利要求1-3中任一项所述的方法，其中，向基站发送用于随机接入过程的特定交互消息采用第一特定交互消息发送过程或第二特定交互消息发送过程来实现，
    所述第一特定交互消息发送过程包括：
    向所述基站发送前导序列；
    接收所述基站针对所述前导序列而发送的随机接入响应；以及
    在接收到所述随机接入响应时，向所述基站发送所述特定交互消息，
    所述第二特定交互消息发送过程包括：
    向所述基站发送包括前导序列和所述特定交互消息的承载的所述特定交互消息，所述特定交互消息的承载包括所述用户设备的标识。
  5. 根据权利要求1-3中任一项所述的方法，其中，确认是否在所述定时器运行期间接收了到由基站指示的包括确认消息的指示消息采用第一确认过程或第二确认过程来实现：
    所述第一确认过程包括：
    在监听到与所述用户设备的标识关联的PDCCH时，确定所监听到的PDCCH是否指示了下行指派；
    如果所监听到的PDCCH指示了下行指派，则对所述下行指派中指示的传输块进行解码；以及
    如果正确解码了所述下行指派，则确定所述传输块中是否包括所述指示消息，以确定是否接收到了所述指示消息，
    所述第二确认过程包括：
    在监听到与所述用户设备的标识关联的PDCCH时，确认所述PDCCH中是否携带了采用用于确定反馈的DCI格式的DCI；以及
    在PDCCH中携带了采用用于确定反馈的DCI格式的DCI时，确认接收到了所述指示消息。
  6. 根据权利要求5所述的方法，其中，所述指示消息包括MAC CE。
  7. 根据权利要求5所述的方法，其中，所述方法还包括：
    在确定所述随机接入过程已成功完成时，停止运行用于随机接入的竞争冲突定时器。
  8. 根据权利要求5所述的方法，其中，所述DCI格式是用于触发小数据传输过程中的随机接入过程或用于在非激活态下触发随机接入过程的DCI格式。
  9. 根据权利要求1-3中任一项所述的方法，其中，所述特定交互消息还携带以下中的至少一者：
    DCCH消息；
    未被配置SDT的DRB的数据到达消息；
    来自标识为1的逻辑信道的数据或MAC SDU。
  10. 一种用户设备，包括：
    处理器；以及
    存储器，存储有指令，
    其中，所述指令在由所述处理器运行时执行根据权利要求1至9中的任一项所述的方法。
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