WO2022022444A1 - Procédé exécuté par un équipement utilisateur et équipement utilisateur - Google Patents

Procédé exécuté par un équipement utilisateur et équipement utilisateur Download PDF

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Publication number
WO2022022444A1
WO2022022444A1 PCT/CN2021/108359 CN2021108359W WO2022022444A1 WO 2022022444 A1 WO2022022444 A1 WO 2022022444A1 CN 2021108359 W CN2021108359 W CN 2021108359W WO 2022022444 A1 WO2022022444 A1 WO 2022022444A1
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random access
sdt
access procedure
step random
small data
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PCT/CN2021/108359
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English (en)
Chinese (zh)
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常宁娟
刘仁茂
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夏普株式会社
常宁娟
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/02—Hybrid 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, the present invention relates to a method performed by a user equipment and a corresponding user equipment.
  • 3rd Generation Partnership Project 3rd Generation Partnership Project
  • RAN#86 plenary meeting approved a new research project of version 17 (see non-patent literature: RP-193252: Work Item on NR smalldata transmissions in INACTIVE state), Referred to as the Small Data Transfer Project.
  • the purpose of this research project is to optimize the signaling overhead and power consumption caused by small-sized data services that are not frequently sent by users.
  • Radio Resource Control_Inactive For user equipment (User Equipment, UE) in the radio resource control inactive state (Radio Resource Control_Inactive, RRC_Inactive), some infrequent small-sized data services (such as instant information, heartbeat signals to keep online, smart wearable devices or sensors)
  • RRC_Inactive Radio Resource Control_Inactive
  • some infrequent small-sized data services such as instant information, heartbeat signals to keep online, smart wearable devices or sensors
  • the transmission of periodic information and periodic meter reading services brought by smart metering equipment, etc. makes the UE need to enter the RRC_connected state to perform the transmission of small-sized data packets, and the resulting signaling overhead brings about a decrease in network performance. It also greatly reduces the energy consumption of the UE.
  • next-generation wireless access New Radio Access
  • RA Random Access
  • a two-step random access process is introduced, that is, the random access process that can be completed in two steps is introduced. into the process.
  • the UE determines the random access control according to the resources used in the random access process, the reason for triggering the random access process, and the quality of the downlink channel.
  • the random access type of the access procedure that is, whether to use a two-step random access procedure or a four-step random access procedure. After the random access procedure type is determined, the UE performs the random access procedure using the resource and parameter configuration corresponding to the selected random access procedure type.
  • the present disclosure proposes a solution to the problem of how to set the random access procedure type in the random access procedure under the small data transmission mechanism used by the UE in the RRC_Inactive state.
  • the present invention provides a method performed by a user equipment and the user equipment, which can effectively perform a random access procedure of a UE in an inactive state when performing small-size data transmission.
  • a method performed by a user equipment UE comprising: when a random access procedure for small data transmission SDT is initiated, determining a random access channel RACH resource configured by the UE; The UE is configured with the RACH resources to determine whether to send small data by performing a two-step random access procedure or by performing a four-step random access procedure.
  • the UE determines to send the small data by performing the two-step random access procedure.
  • data if only the RACH resource for the four-step random access procedure of the SDT is configured on the bandwidth part for performing random access, the UE determines to send small data by performing the four-step random access procedure , if both the RACH resources used for the four-step random access process of the SDT and the RACH resources used for the two-step random access process of the SDT are configured on the bandwidth part for performing random access, when the downlink When the RSRP of the reference signal received power of the loss reference is higher than the second RSRP threshold, the UE determines to send small data by performing the two-step random access procedure, and when the RSRP of the downlink path loss reference is lower than or not higher than the second RSRP threshold When the RSRP threshold is two, the UE determines to send small data by performing the four-step random access procedure.
  • the UE determines to send the small data by performing the two-step random access procedure.
  • the UE determines to send the small data by performing the two-step random access procedure.
  • the UE falls back to the execution of the non-SDT random access procedure.
  • the UE continues to perform the two-step random access procedure for the SDT.
  • the UE determines that the medium access control protocol containing small data to be sent
  • the size of the data unit that is, the MAC PDU
  • TBS threshold the UE determines to send small data by performing the two-step random access procedure, and falls back to the non-SDT random access procedure.
  • the UE determines that the medium access control protocol containing small data to be sent When the size of the data unit, that is, the MAC PDU, is greater than the first transport block size TBS threshold, if the RACH resource for the four-step random access process of the SDT is configured on the bandwidth part for performing random access, the The UE determines to send small data by performing the four-step random access procedure.
  • the UE when the UE further determines that the medium access control protocol containing small data to be sent When the size of the data unit, that is, the MAC PDU, is larger than the TBS threshold value of the second transport block size, the UE falls back to the execution of the non-SDT random access procedure to select the random access type.
  • a method performed by a user equipment UE comprising: in a two-step random access process for small data transmission SDT, the UE determines whether the number of times of sending a random access preamble exceeds If the UE determines that the number of times the random access preamble is sent exceeds the specified threshold, the UE is not configured with the random access channel RACH resource used for the four-step random access procedure of the SDT. , the UE falls back to the execution of the non-SDT four-step random access procedure.
  • a method performed by a user equipment UE including: in a two-step random access process for small data transmission SDT, the UE determines whether the number of times of sending a random access preamble exceeds If the UE determines that the number of times the random access preamble is sent exceeds the specified threshold, the UE is not configured with the random access channel RACH resource used for the four-step random access procedure of the SDT. , the UE falls back to the execution of the non-SDT two-step random access procedure.
  • the UE determines to transmit small data by performing the four-step random access procedure.
  • a user equipment comprising: a processor; and a memory storing instructions; wherein the instructions execute the above method when executed by the processor.
  • the random access procedure of the UE in the inactive state can be efficiently performed when small-sized data transmission is performed.
  • FIG. 1 is a schematic sequence diagram of a contention-based four-step random access procedure.
  • FIG. 2 is a schematic sequence diagram of a non-contention-based four-step random access procedure.
  • FIG. 3 is a schematic sequence diagram of a contention-based two-step random access procedure.
  • FIG. 4 is a schematic sequence diagram of a non-contention-based two-step random access procedure.
  • FIG. 5 is a flowchart illustrating a method performed by a user equipment according to Embodiment 1 of the present invention.
  • FIG. 6 is a flowchart illustrating a method performed by a user equipment according to Embodiment 4 of the present invention.
  • FIG. 7 is a flowchart illustrating a method performed by a user equipment according to Embodiment 5 of the present invention.
  • FIG. 8 is a block diagram showing a user equipment UE according to the present invention.
  • the NR mobile communication system is used as an example application environment to specifically describe various embodiments according to the present disclosure.
  • the present disclosure is not limited to the following embodiments, but is applicable to more other wireless communication systems.
  • RRC state Three RRC states are defined in the NR system: RRC idle state RRC_IDLE, RRC inactive state RRC_INACTIVE and RRC connected state RRC_CONNECTED.
  • RRC_IDLE refers to the state when the UE has not established an RRC connection
  • RRC_INACTIVE refers to the state when the UE has established an RRC connection but the RRC connection is suspended/suspended
  • RRC_CONNECTED refers to the state when the UE has established an RRC connection and the RRC connection is not suspended.
  • the UE saves the UE Inactive AS context, monitors the radio access network-based paging or core network-based paging, and monitors the Paging-Radio Network Temparary Identifier, P-RNTI) addresses short messages (short messages) sent through Downlink Control Information (DCI) to notify paging and system information updates, obtain system information through broadcast, and perform periodic Radio access network-based Notification Area (RNA) update or perform RNA update when moving out of a configured RNA.
  • DCI Downlink Control Information
  • RNA Radio access network-based Notification Area
  • the UE in RRC_INACTIVE cannot realize unicast data communication with the network side, and it restores the RRC connection with the network side by sending an RRC resume request message to perform an RRC resume procedure (RRC resume procedure).
  • Physical random access channel resource Physical Random Access Channel (PRACH) Resource.
  • PRACH Physical Random Access Channel
  • the base station broadcasts the physical random access channel parameter configuration used by the cell through system information.
  • the physical random access channel resource PRACH resource may refer to the physical frequency resource and/or time domain resource and/or code used for random access. Domain resources (such as preamble).
  • Random Access Channel Random Access Channel, RACH.
  • RACH may refer to either the transport channel RACH or the physical random access channel PRACH, without distinction.
  • RACH parameters/configurations refer to the wireless configuration that implements the random access function, including PRACH related configurations, such as the maximum number of preamble transmissions, power boost parameters, random access response receiving window size, MAC contention resolution timer configuration, PRACH time-frequency resource configuration , Message 1 (ie preamble) subcarrier spacing, information used to indicate the number of synchronization channel blocks (Synchronization Signal Block, SSB) corresponding to each RACH opportunity (RACH occasion, RO) and the contention-based random preamble corresponding to each SSB The configuration of the number of preambles (configured by the ssb-perRACH-OccasionAndCB-PreamblesPerSSB information element), the backoff parameter (in the scalingFactorBI information element), etc.
  • R Random Access Channel
  • CBRA contention-based random access
  • CBRA contention-based random access
  • CFRA contention Free Random Access
  • Each MAC sub-PDU may be a MAC subheader including a backoff indication, a MAC subheader including a random access preamble RAPID, or a MAC subheader including a random access preamble RAPID and a corresponding RAR.
  • the content of the RAR includes a time advance command, an uplink grant, a temporary cell radio network temporary identifier TC-RNTI, and the like.
  • Step 3 The UE sends message 3 (uplink transmission scheduled by the uplink grant in message 2), which is generally used to send the UE identity to the base station for radio resource control (Radio Resource Control, RRC) connection RRC message for setup/restore/re-establishment or system information request, UE contention resolution identifier for random access contention resolution, etc.;
  • Step 4 UE receives message 4 (ie, message for contention resolution) from the base station.
  • the PRACH resource used in CBRA is shared by all UEs in the cell, and the random access process is successfully completed only when the UE completes the above four steps of random access of CBRA and the contention is successfully resolved.
  • the process of CFRA is shown in FIG.
  • the base station generally allocates dedicated PRACH resources such as a preamble to the UE in advance (referred to as step 0 in FIG. 2 ), so there is no contention and no contention resolution is required.
  • Two-step random access procedure refers to the two-step random access procedure introduced by the NR system of Release 16. Two-step random access can also be used for CBRA (as shown in Figure 3) and CFRA (as shown in Figure 4).
  • message A contains a random access preamble and the associated physical uplink shared channel PUSCH payload (payload) transmission.
  • the content of the PUSCH payload is similar to that contained in message 3, which can include RRC messages or user plane data.
  • MAC control elements such as buffer status report BSR and UE identity.
  • the second and fourth steps are combined into the same step called message B.
  • Message B is the response to message A in the two-step random access process, and its content is similar to the content of the above-mentioned messages 2 and 4, and can include the successful RAR (contention resolution identifier, HARQ feedback time for contention resolution) indication, physical uplink control channel resource indication, time advance command, cell wireless network temporary identifier (C-RNTI, etc.), backoff indication, fallback RAR (time advance command, uplink grant, TC-RNTI), and may also include The response RRC message corresponding to the RRC message included in the response message A, etc.
  • the two-step random access process can shorten the delay of random access.
  • the two-step random access adopts a different random access resource configuration from the four-step random access.
  • the UE may fall back to the process of four-step random access during two-step random access, for example, when receiving a fallback random access response (fallback Random Access Response, fallbackRAR) sent by the network side, Or when the number of attempts to send message A in the two-step random access exceeds a configured maximum number of times, etc.
  • fallbackRAR fallback Random Access Response
  • the UE When the MAC layer initiates a random access procedure, the UE needs to select the type of random access, that is, whether to perform a two-step random access or a four-step random access procedure.
  • the UE when the UE is configured with CFRA resources of the four-step random access type, the UE performs four-step random access; when the UE is configured with CFRA resources of two-step random access, the UE performs two steps Random access process; and when the UE is not configured with CFRA resources, the UE selects the random access type according to the reference signal received power (Reference Signal Received Power, RSRP) measured by the downlink pathloss reference (downlink pathloss reference).
  • RSRP Reference Signal Received Power
  • the UE When the RSRP is greater than a configured first RSRP threshold (the random access type selection RSRP threshold, which can be recorded as msgA-RSRP-Threshold), the UE performs two-step random access, otherwise, the UE performs four-step random access enter.
  • a configured first RSRP threshold the random access type selection RSRP threshold, which can be recorded as msgA-RSRP-Threshold
  • SDT Small Data Transmission
  • the RRC layer determines to use the SDT mechanism to send data
  • the RRC layer informs the lower layer to use the SDT mechanism, or the RRC layer sends an SDT indication to the lower layer.
  • the lower layer includes the MAC layer, and the MAC layer thus triggers a random access procedure.
  • the random access type setting procedure of the existing random access procedure does not involve and consider the SDT mechanism. Therefore, how to determine or set the type of the random access procedure in the random access procedure for SDT becomes the problem to be solved by the present disclosure.
  • the following embodiments provide solutions for how the UE determines or sets the random access procedure type in the case of performing SDT. It is worth noting that the SDT does not limit the name of the mechanism for transmitting small data in the RA process, and can also be named in other ways, such as early data transmission.
  • the random access type refers to two-step random access or four-step random access; in some embodiments, the random access type may also refer to random access for SDT or random access for non-SDT access.
  • the non-SDT random access refers to a random access procedure in which user plane data is not sent along with message 3 or message A.
  • This embodiment 1 provides a method for determining the random access type according to the configured RACH resources when the random access process is initiated.
  • the random access RACH resource or parameter configuration used for SDT is configured separately from the random access RACH resource or parameter configuration used for transmitting the random access procedure, ie, non-SDT.
  • FIG. 5 is a flowchart illustrating a method performed by a user equipment according to Embodiment 1 of the present invention.
  • step 501 when a random access procedure for small data transmission SDT is initiated, the RACH resources configured by the UE are determined.
  • step 503 it is determined according to the RACH resources configured by the UE whether to send small data by performing a two-step random access procedure or by performing a four-step random access procedure.
  • the UE determines to perform the two-step random access procedure to send small data in message A. If only RACH resources for the four-step random access of SDT are configured on the bandwidth part BWP for performing random access, that is to say, no RACH resources for the two-step random access of SDT are configured, the UE determines that A four-step random access procedure is performed to send small data together with message 3.
  • both the four-step random access RACH resource for SDT and the two-step random access resource for SDT are configured on the bandwidth part BWP for performing random access, preferably, the UE determines to perform the random access for SDT.
  • Two-step random access procedure of SDT alternatively, if the RSRP referenced by the downlink path loss is higher than a second RSRP threshold, the UE performs a two-step random access procedure for SDT to send small data; if the following If the RSRP referenced by the line path loss is lower than or equal to the second RSRP threshold, the UE performs a four-step random access procedure for SDT to send small data.
  • the UE's determination to perform a two-step random access procedure can be described as the UE setting the random access type variable RA_TYPE to 2-step, and the UE's determination to perform a four-step random access procedure can be described as the UE setting the random access variable to 4-step step.
  • the second RSRP threshold value is a parameter configured by the network side through the RRC message, which is denoted as msgA-RSRP-Threshold-SDT here; when the network side does not configure the second RSRP threshold value, the UE It is considered that the second RSRP threshold value adopts the same value as the first RSRP threshold value.
  • the second RSRP threshold and the first RSRP threshold are the same parameter.
  • the network side may configure multiple second RSRP thresholds.
  • each RSRP threshold corresponds to one or more PUSCH resources associated with msgA.
  • the second RSRP threshold takes all the second RSRP thresholds. The smallest of the RSRP thresholds.
  • the downlink path loss refers to the downlink of the primary cell.
  • This embodiment 2 provides a method for determining the random access type according to the configured RACH resources and the RSRP referenced by the downlink path loss when the random access process is initiated.
  • the random access RACH resource or parameter configuration used for SDT is configured separately from the random access RACH resource or parameter configuration used for transmitting the random access procedure, ie, non-SDT.
  • the random access type may refer to a random access procedure for SDT or a random access procedure for non-SDT.
  • the UE When the MAC layer initiates a random access procedure for SDT, if only RACH resources for two-step random access for SDT are configured on the bandwidth part BWP for performing random access, but no RACH resources for SDT are configured For four-step random access RACH resources, the UE sets the random access type variable RA_TYPE to 2-step. The UE further determines that if the RSRP measurement value referenced by the downlink path loss is not higher than a second RSRP threshold value, the MAC layer falls back to the non-SDT random access procedure, and indicates to the upper layer (RRC layer) that SDT fallback has occurred , or inform the upper-layer SDT to cancel.
  • RRC layer the upper layer
  • the MAC layer continues to perform the random access procedure for SDT, using the RACH parameters for SDT and from the random access RACH for SDT Select an available resource among resources to send message A and small data.
  • the downlink path loss refers to the downlink of the primary cell.
  • the second RSRP threshold value is described in Embodiment 1.
  • This embodiment 3 provides a method for determining the random access type according to the configured RACH resource and the transport block size (Transport Block Size, TBS) threshold when the random access process is initiated.
  • the random access RACH resource or parameter configuration used for SDT is configured separately from the random access RACH resource or parameter configuration used for transmitting the random access procedure, ie, non-SDT.
  • the UE When the MAC layer initiates a random access procedure for SDT, if the RACH resource for two-step random access for SDT is configured on the BWP performing the random access procedure, the UE further determines that the data to be sent contains small data. When the size of the MAC PDU is greater than a first TBS threshold, preferably, the UE determines to perform two-step random access, sets the random access type variable RA_TYPE to 2-step, and falls back to non-SDT random access. Enter the process, instruct the upper RRC layer to roll back the SDT process or notify the cancellation of the SDT process.
  • the UE determines to perform the four-step random access, sets the random access type variable RA_TYPE to 4-step, and performs the random access for SDT.
  • the four-step random access procedure if the RACH resource for the four-step random access of SDT is configured on the BWP but the size of the MAC PDU containing small data to be sent is greater than a second TBS threshold, that is, the MAC PDU is When the size is greater than both the first TBS threshold and the second TBS threshold, the UE falls back to the non-SDT random access procedure, and performs the random access type RA_TYPE determination of the non-SDT random access procedure.
  • the determination of the random access type RA_TYPE for performing the non-SDT random access procedure refers to determining the random access type according to the RA_TYPE selection method in the non-SDT case in Release 16.
  • the size of the MAC PDU containing small data refers to the available uplink data for transmission plus the size of the corresponding MAC header, and may also include the size of one or more MAC control elements (Control Element, CE).
  • the first TBS threshold value or the second TBS threshold value may be directly configured through RRC signaling explicitly. It may also be calculated by the UE according to the configured or allocated uplink resources/parameters of the PUSCH used for sending the load of message A or message 3. Optionally, if more than one first TBS threshold value is configured or allocated, the first TBS threshold value in the above operation is the maximum value, or the selected value for sending the message A load is associated with the load. The calculated value of the PUSCH resource.
  • Embodiments 4 to 5 provide methods for determining the random access type when the number of times of sending the message A reaches the maximum number of transmissions in the two-step random access process for SDT.
  • This embodiment 4 provides a random access type determination method when random access type backoff occurs.
  • FIG. 6 is a flowchart illustrating a method performed by a user equipment according to Embodiment 4 of the present invention.
  • the UE In a two-step random access procedure for SDT, after the UE sends message A accompanied by small data, the UE starts a message B response window, and monitors and receives message B before the window times out. If the message B response window times out, the random access response reception is not considered to be successful, if the random access process is not completed.
  • step 601 the UE determines whether the count value of the times of sending the random access preamble, PREAMBLE_TRANSMISSION_COUNTER, exceeds the configured maximum times of sending the message A, msgA-TransMax.
  • step 603 if PREAMBLE_TRANSMISSION_COUNTER is equal to msgA-TransMax plus 1, the UE sets the random access type variable RA_TYPE to 4-step. At this time, if the four-step random access RACH resource for SDT is not configured, the UE falls back to the non-SDT four-step random access procedure, and sends an SDT cancellation indication to the upper RRC layer or informs the upper layer SDT to fall back.
  • the data in the UE update message 3 cache is non-SDT data, that is, the UE update message 3.
  • the data in the cache is the data on the radio bearer that does not include user plane data.
  • the data in the update message 3 cache is non-SDT data and is executed after the UE receives the random access response, and the UE updates the message 3 cache according to the uplink grant UL grant in the received random access response. the MAC PDU.
  • FIG. 7 is a flowchart illustrating a method performed by a user equipment according to Embodiment 5 of the present invention.
  • the UE In a two-step random access procedure for SDT, after the UE sends message A accompanied by small data, the UE starts a message B response window, and monitors and receives message B before the window times out. If the message B response window times out, the random access response reception is not considered to be successful, if the random access process is not completed.
  • step 701 the UE determines whether the count value PREAMBLE_TRANSMISSION_COUNTER of the sending times of the random access preamble exceeds the configured maximum sending times value msgA-TransMax of the message A.
  • step 703 if PREAMBLE_TRANSMISSION_COUNTER is equal to msgA-TransMax plus 1, and the four-step random access resource for SDT is not configured, the UE continues the current two-step random access procedure without changing the value of the random access type RA_TYPE, and the UE Fall back to the non-SDT two-step random access process, send an SDT cancellation indication to the upper RRC layer or inform the upper layer SDT to fall back.
  • the data in the UE update message A cache is non-SDT data, that is, the UE update message A.
  • the data in the cache is the data on the radio bearer that does not include user plane data.
  • the data in the update message A cache is non-SDT data and is executed after the UE receives the random access response, and the UE updates message 3 according to the uplink grant (UL grant) in the received random access response.
  • MAC PDUs in the cache is the two-step random access process in which the UE falls back to non-SDT further includes that the UE flushes the message A buffer (flush MsgA buffer) or flushes the HAPQ buffer used for sending the MAC PDU in the message A buffer.
  • PREAMBLE_TRANSMISSION_COUNTER is equal to msgA-TransMax plus 1
  • the UE will change the value of the random access type RA_TYPE and set it to 4-step , perform a four-step random access procedure for SDT.
  • FIG. 8 is used to illustrate a user equipment that can execute the method performed by the user equipment described in detail above in the present invention as a modification.
  • FIG. 8 is a block diagram showing a user equipment UE according to the present invention.
  • the user equipment UE80 includes a processor 801 and a memory 802 .
  • the processor 801 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like.
  • the memory 802 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.
  • Program instructions are stored on the memory 802 . When the instructions are executed by the processor 801, the above method described in detail in the present invention and executed by the user equipment can be executed.
  • the MAC layer determines the random access type, it can be one or more of the following conditions, the MAC determines that the random access type is two-step random access for SDT, and sets RA_TYPE to 2-step: When the two-step random access resource for SDT is configured on the BWP for random access, the size of the MAC PDU containing small data to be sent is not greater than the configured first TBS threshold, the downlink RSRP is greater than the second RSRP threshold; it may also be that when one or more of the following conditions are met, the MAC determines that the type of random access is four-step random access for SDT, and sets RA_TYPE to 4-step: when the Four-step random access resources for SDT are configured on the BWP for random access, and the size of the MAC PDU containing small data to be sent is not greater than the configured second T
  • the MAC layer determines, according to the foregoing method, whether the initiated random access procedure type satisfies the two-step random access for SDT, and if so, determines the initiated random access procedure type.
  • the random access procedure type is two-step random access for SDT, and RA_TYPE is set to 2-step; otherwise, the UE determines whether the initiated random access procedure type satisfies the four-step random access for SDT, and if so , then it is determined that the initiated random access procedure type is the four-step random access for SDT, and RA_TYPE is set to 4-step; otherwise, the UE falls back to the non-SDT procedure and performs the non-SDT random access procedure, And according to the existing mechanism, determine whether the random access procedure type is a two-step random access procedure or a four-step random access procedure.
  • base station refers to a mobile communication data and control switching center with larger transmit power and wider coverage area, including functions such as resource allocation and scheduling, and data reception and transmission.
  • User equipment refers to a user's mobile terminal, for example, including a mobile phone, a notebook, and other terminal equipment that can wirelessly communicate with a base station or a micro base station.
  • the method and related apparatus of the present disclosure have been described above in conjunction with the preferred embodiments. Those skilled in the art will understand that the methods shown above are only exemplary. The methods of the present disclosure are not limited to the steps and sequences shown above.
  • the base station and user equipment shown above may include more modules, for example, may also include modules that can be developed or developed in the future and that can be used for the base station, MME, or UE, and so on.
  • the various identifiers shown above are only exemplary and not restrictive, and the present disclosure is not limited to the specific information elements exemplified by these identifiers. Numerous changes and modifications may occur to those skilled in the art in light of the teachings of the illustrated embodiments.
  • the program running on the device may be a program that causes a computer to implement the functions of the embodiments of the present disclosure 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 disclosure 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 to replace existing integrated circuits, one or more embodiments of the present disclosure may also be implemented using these new integrated circuit technologies.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé exécuté par un équipement utilisateur (UE). Le procédé comprend les étapes consistant à : lors de l'initiation d'une procédure d'accès aléatoire permettant une transmission de petites données (SDT), déterminer une ressource d'un canal d'accès aléatoire (RACH) configurée par un UE ; et, en fonction de la ressource de RACH configurée par l'UE, déterminer s'il faut envoyer de petites données en effectuant une procédure d'accès aléatoire à deux étapes ou une procédure d'accès aléatoire à quatre étapes.
PCT/CN2021/108359 2020-07-30 2021-07-26 Procédé exécuté par un équipement utilisateur et équipement utilisateur WO2022022444A1 (fr)

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