CN117479315A - Method performed by user equipment and user equipment - Google Patents

Method performed by user equipment and user equipment Download PDF

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Publication number
CN117479315A
CN117479315A CN202210844588.3A CN202210844588A CN117479315A CN 117479315 A CN117479315 A CN 117479315A CN 202210844588 A CN202210844588 A CN 202210844588A CN 117479315 A CN117479315 A CN 117479315A
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CN
China
Prior art keywords
timer
small data
data transmission
user equipment
rrc
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CN202210844588.3A
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Chinese (zh)
Inventor
张崇铭
刘仁茂
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Sharp Corp
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Sharp Corp
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Priority to CN202210844588.3A priority Critical patent/CN117479315A/en
Priority to PCT/CN2023/107681 priority patent/WO2024017184A1/en
Publication of CN117479315A publication Critical patent/CN117479315A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

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

Abstract

The invention provides a method executed by user equipment and the user equipment, wherein the method comprises the following steps: when the RRC connection recovery procedure is triggered or started, the UE determines whether small data transmission can be performed; if the condition for performing small data transmission is satisfied, the UE starts a timer T319a, stops the timer T302 if the timer T302 is running, or stops the timer T390 if the timer T390 is running; if the condition for performing small data transmission cannot be satisfied, the UE starts a timer T319 and stops the timer T302 if the timer T302 is running or stops the timer T390 if the timer T390 is running when an RRC resume request message is transmitted to the base station and an RRC resume or RRC configuration message is received as a response message.

Description

Method performed by user equipment and user equipment
Technical Field
The present invention relates to the field of wireless communication technology, and more specifically, to a method performed by a user equipment, and a corresponding base station and user equipment.
Background
In order to shorten transmission delay and save signaling overhead, the UE in the RRC inactive state (RRC INACTIVE STATE) may communicate with the base station/network side, receive downlink data and send uplink data. Such a procedure may be referred to as a small data transfer procedure (small data transmission, SDT) which is characterized by the UE still being inactive and the transferred data belonging to a specific DRB (Data Radio Bearer ).
However, the following may be the case in the course of small data transmission:
the timer T302 is in an operating state, and a timer T390 for a certain Access Category (AC) is in an operating state.
Both timers T302 and T390 are used for access control (access control) and when they are running, data related to traffic of part of the access class will not be transmitted or even the arrival of the traffic will not be reported to the network.
Considering that the UE can normally communicate with the base station/network side during the small data transmission, how to avoid that the traffic arriving during the small data transmission is prohibited to be transmitted or prohibited to be reported is a problem to be solved.
Disclosure of Invention
In order to solve the above-mentioned problems in the prior art, the present invention provides a method performed by a user equipment and the user equipment, which can effectively avoid a situation that traffic arriving in a small data transmission process is prohibited from being transmitted or reported even in a case that the UE normally communicates with a base station/network side in the small data transmission process, thereby improving the communication efficiency and reliability of a wireless communication system.
According to a first aspect of the present invention, there is provided a method performed by a user equipment, UE, which is a small data transmission procedure performed by the user equipment, UE, wherein the small data transmission procedure is a procedure in which the UE in an RRC inactive state can communicate with a base station to transmit data belonging to a specific DRB, comprising the steps of:
when the RRC connection recovery procedure is triggered or started, the UE determines whether small data transmission can be performed;
if the condition for performing small data transmission is satisfied, the UE performs at least one of the following operations:
starting a timer T319a for managing the RRC connection recovery procedure;
if the timer T302 for access control is running, the timer T302 is stopped;
if the timer T390 for access control is running, the timer T390 is stopped,
if the condition for performing the small data transmission cannot be satisfied, the UE starts a timer T319 for managing the RRC connection restoration procedure, and when transmitting an RRC restoration request message to the base station and receiving an RRC restoration or an RRC configuration message as a response message, the UE performs at least one of the following operations:
if the timer T302 is running, the timer T302 is stopped;
if the timer T390 is running, the timer T390 is stopped.
In the method performed by the user equipment, the method preferably further includes the following steps:
in the case where the condition for performing small data transmission is satisfied,
when the timer T302 is stopped, the UE determines that the access prohibition of the AC whose corresponding T390 timer is not running is released;
when the timer T390 is stopped, the UE determines that access prohibition of AC corresponding to the timer is released.
In the above method performed by the user equipment, more preferably, the method further includes the steps of:
informing the UE that the upper layer access barring is released.
In the method performed by the user equipment, the method preferably further includes the following steps:
in the case where the condition for performing small data transmission cannot be satisfied,
when the timer T302 is stopped, the UE determines that the access prohibition of the AC whose corresponding T390 timer is not running is released;
when the timer T390 is stopped, the UE determines that access prohibition of AC corresponding to the timer is released.
In the above method performed by the user equipment, more preferably, the method further includes the steps of:
informing the UE that the upper layer access barring is released.
In the above-described method performed by the user equipment, preferably,
the conditions met by the UE for performing small data transmissions include at least:
the system information block contains the relevant configuration information of small data transmission;
the UE is configured with configuration information for small data transmission;
the lower layer of the RRC layer indicates that the condition for starting small data transmission is satisfied.
In the above-described method performed by the user equipment, preferably,
the conditions met by the UE for performing small data transmissions include at least:
the upper layer of the RRC layer requests recovery of the RRC connection;
the data to be transmitted in the uplink can be mapped to a radio bearer configured with small data transmission or can be mapped to a radio bearer which can be used for small data transmission;
the UE receives a paging message, wherein the paging message carries the identification information of the UE.
In the above-described method performed by the user equipment, preferably,
the paging message also carries information indicating that the UE starts or performs small data transmission.
In the above-described method performed by the user equipment, preferably,
the paging message contains one or more paging records that are divided into at least two packets, wherein one of the packets is capable of small data transmissions.
According to another aspect of the present invention, there is provided a user equipment comprising:
a processor; and
a memory, the memory having instructions stored thereon,
the instructions, when executed by the processor, cause the user equipment to perform the method according to the above.
According to the method executed by the user equipment and the corresponding user equipment, even under the condition that the UE normally communicates with the base station/network side in the small data transmission process, the situation that the service arrived in the small data transmission process is forbidden to be transmitted or the report is forbidden can be effectively avoided, so that the communication efficiency and the reliability of the wireless communication system can be improved.
Drawings
The foregoing and other features of the invention will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings in which:
fig. 1 is a flowchart showing a four-step random access procedure.
Fig. 2 is a flow chart showing a two-step random access procedure.
Fig. 3 is a flow chart illustrating a method performed by a user equipment in accordance with an embodiment of the present invention.
Fig. 4 shows a block diagram of a user equipment according to an embodiment of the invention.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description. It should be noted that the present invention should not be limited to the specific embodiments described below. In addition, for the sake of brevity, detailed descriptions of well-known techniques, which are not directly related to the present invention, are omitted to prevent confusion of the understanding of the present invention.
Before the detailed description, several terms mentioned in the present invention are explained as follows. Unless otherwise indicated, all terms used in the present invention have the following meanings.
UE User Equipment user equipment
New NR New Radio generation wireless technology
LTE Long Term Evolution long term evolution technology
eLTE Enhaced Long Term Evolution enhanced long term evolution technology
RRC Radio Resource Control radio resource control (layer)
MAC Medium Access Control Medium Access control (layer)
PHY Physical Layer physical layer
PRACH Physical Random Access Channel physical random access channel
RA Random Access
RAR Random Access Response random access response
RB Radio Bearer
RNTI Radio Network Temporary Identifier radio network temporary identity
PDCP Packet Data Convergence Protocol packet data convergence protocol
RLC Radio Link Control radio link control protocol (layer)
I-RNTI Inactive Radio Network Temporary Identifier inactive wireless network temporary identification
NAS Non-Access Stratum
AS Access Stratum access stratum
Various embodiments in accordance with the present invention are described in detail below with reference to an example application environment for an NR mobile communication system and its subsequent evolved versions, with reference to NR-enabled base stations and UE devices. However, it should be noted that the present invention is not limited to the following embodiments, but is applicable to many other wireless communication systems, such as eLTE, communication systems, or NB-Iot systems, or LTE-M systems. But also to other base stations and UE devices, such as those supporting LTE/NB-Iot/LTE-M.
Access Category (AC)
In an RRC connection recovery procedure triggered by an upper layer above the RRC layer, the upper layer may provide an Access Category (AC) to the RRC, and the UE performs an access control procedure according to the provided AC before starting the RRC connection recovery procedure. The result of the access control procedure is both forbidden access (access attempt is barred) and allowed access (access attempt is allowed).
The operation of the access control flow is as follows:
if its corresponding timer T390 is running for an AC provided by an upper layer, then access to that AC is barred;
if T302 is running and the AC is not an AC corresponding to a value of "0" or a value of "2," then access to that AC is also barred.
If none of the above exists, the UE may perform an access barring check (Access barring check) step according to the parameters related to access control broadcasted in the system information according to the provided AC, and determine the result of the access control procedure according to the result of the step. In this step, if access is barred, the UE starts its corresponding timer T390 for the AC.
Based on the above operation, when it is determined that the result of the access control is access prohibition:
if T302 is running and T390 with an AC value of "2" is running, the UE will notify the upper layer that access to other ACs is barred except for an AC with an AC value of "0";
if T302 is running and T390 with an AC value of "2" is not running, the UE will notify the upper layer that access to other ACs is barred except for an AC with an AC value of "0" or "2";
if T302 is not running, the UE will notify the upper layer that access to the corresponding AC is barred.
When it is determined that the access control result is to run access, the UE also informs the upper layer that access to the corresponding AC is allowed.
According to the result of the access control, if the access is forbidden, the RRC connection recovery flow is ended; if access is allowed, the UE may continue to perform other operations in the RRC connection recovery procedure, such as sending an RRC connection recovery request message to the base station, etc.
Timers T319 and T319a
In the process of starting the RRC connection restoration, if the condition for performing the small data transmission is satisfied, the UE may consider that the restoration process is triggered or started by the small data transmission and start a timer T319a;
if the condition for performing small data transmission cannot be satisfied, the UE starts a timer T319.
Both timers are used to manage the RRC connection recovery procedure, and when either T319 or T319a runs out, the UE will enter an IDLE state (IDLE) and perform the corresponding operation.
Four-step random access procedure (4step Random Access procedure,4-step RA)
As shown in fig. 1, the UE performs a 4-step random access procedure including the steps of:
step S100: the UE selects a random access resource for random access. In this process
-the UE selecting a PREAMBLE sequence (PREAMBLE) for transmission, setting the sequence number corresponding to the selected PREAMBLE to the value of the parameter preamble_index; and
-determining a next PRACH occasion (determine the next available PRACH occasion from the PRACH occasions) available for transmission among a plurality of PRACH occasions (PRACH occasions).
Step S101: the UE transmits the selected preamble on the determined PRACH occasion.
Step S102: the UE receives a random access response (Random Access Response, RAR) transmitted from the base station side.
If the sequence number (preamble index id) corresponding to the preamble transmitted by the UE in step S101 is carried in this RAR, the UE may determine that the RAR is transmitted to itself.
The UL grant is carried in such RAR to indicate PUSCH resources for transmitting message 3.
Upon receiving the above-mentioned RAR, the UE processes the UL grant carried in the RAR and indicates it to the lower layer. If this is the first successful receipt of the above RAR by the UE, the UE obtains (obtain) the MAC PDU for transmission from the multiplexing and assembling entity (Multiplexing and assembly entity) and saves it in the buffer (MSG 3 buffer) of message 3.
If the UE does not receive the RAR within a predetermined time, the UE increases the value of the variable preamble_transmission_counter by 1, whose initial value is 0. If preamble_transmission_counter=preableTransMax+1, then the UE considers that the random access procedure is not successfully completed, and may indicate a random access problem to the upper layer.
Step S103: the UE sends message 3 on PUSCH resources indicated by the UL grant.
In this message 3, the UE will carry identification information for contention conflict resolution.
Step S104: the UE receives the message 4 sent from the base station side.
In the message 4, if the identification information carried by the UE in the message 3 is carried, the UE considers that the contention conflict is resolved, and the random access procedure is successfully completed.
If the UE does not receive the message 4 for a predetermined time, the UE increases the value of the variable preamble_transmission_counter by 1, the initial value of which is 0. If preamble_transmission_counter=preableTransMax+1, then the UE considers that the random access procedure is not successfully completed, and may indicate a random access problem to the upper layer.
Since the UE has undergone the message passing process of steps S101 to S104 in the above random access process, it is called a "four-step random access" (4-step RA) process.
The above four-step random access procedure may also be referred to as layer 1 random access (Type-1layer 1 Random Access Procedure,type 1 L1 RA) of the first Type. From the physical layer (also called layer 1, layer 1) perspective, the type 1 L1 RA procedure involves at least transmission of a random access preamble sequence (or transmission called message one) on the PRACH, and transmission/reception of a random access response message (Random Access Response Message), the transmission of which is scheduled by the PDCCH and transmitted on the PDSCH; in addition, the type 1 L1 RA procedure may further include PUSCH scheduled by uplink grant carried in random access response, and PDSCH for contention resolution (contention resolution) therewith.
Two-step random access procedure (2 step Random Access procedure,2-step RA)
As shown in fig. 2, the two-step random access procedure is that
Step S200: the UE selects a random access resource for random access. In this process
-the UE selecting a PREAMBLE sequence (PREAMBLE) for transmission, setting the sequence number corresponding to the selected PREAMBLE to the value of the parameter preamble_index; and
-determining a next PRACH occasion (determine the next available PRACH occasion from the PRACH occasions) available for transmission among a plurality of PRACH occasions (PRACH occasions), and
-determining PUSCH resources corresponding to the preamble sequence.
Step S201: the UE sends a message a (MSGA) to the base station.
Wherein, the message A contains a preamble and a payload (payload) of the message A.
Wherein, the preamble is sent on PRACH and the payload of message a is sent on PUSCH. The payload of message a is transmitted on PUSCH packaged as a MAC PDU. When the UE determines the occasion for transmitting message a, if this is the first time the UE transmits MSG a, the UE acquires (obtain) the MAC PDU for transmission from the multiplexing and assembling entity (Multiplexing and assembly entity) and saves it in the buffer (MSGA buffer) of message a.
Step S202: the UE receives message B (MSGB) sent by the base station.
Wherein message B carries information for contention conflict resolution. If the message B carries a sequence number (preamble index id) corresponding to the preamble sent by the UE in step S201, the UE may determine that the message B is sent to itself, and then consider that the contention conflict resolution, and the random access procedure is successfully completed.
In order to solve the problems mentioned in the background art, several embodiments of the present invention are described in detail below.
Example 1
The present embodiment provides a method for transmitting SDT procedure by UE, wherein the SDT procedure is a procedure in which UE in RRC inactive state can communicate with a base station/network side to transmit data belonging to a specific DRB, as shown in fig. 3, and includes:
step S301: when the RRC connection recovery procedure is triggered or initiated, the UE determines whether small data transmission can be performed.
Step S302: if the condition for performing the small data transmission is satisfied, the UE decides/considers (con) that the recovery procedure is triggered or initiated by the small data transmission, and the UE performs one or more of the following operations:
starting a timer T319a, wherein the timer T319a is a timer for managing the RRC connection recovery procedure;
if the timer T302 is running, the UE stops the timer T302, wherein the timer T302 is a timer for access control; and optionally, determining/deeming (con der) that all AC access barring is released, in particular, those AC access barring whose corresponding T390 timer is not running is released, and may also notify the UE that upper layer access barring is released;
if the timer T390 is running, the UE stops the timer T390, wherein the timer T390 is a timer for access control; and optionally, determining/deeming (con-sider) that access to the AC corresponding to the timer is disabled; and may also inform the UE that the upper layer access barring is released.
Step S303: if the condition for performing small data transmission cannot be satisfied, the UE starts a timer T319 (wherein the timer T319 is a timer for managing the RRC connection recovery procedure), and performs one or more of the following operations when a RRC resume Request message (RRC recovery request message) is transmitted to the base station/network side and a response message RRC resume or RRC setup message is received:
if timer T302 is running, then the UE stops timer T302 and, optionally, decides/considers (con der) that all ACs' access barring is released, particularly those ACs whose corresponding T390 timer is not running are released, and may also inform the UE that the upper layer access barring is released, which may be a non-access stratum (NAS) above the RRC layer;
if timer T390 is running, then the UE stops timer T390 and, optionally, decides/considers (con der) that the access barring of the AC corresponding to the timer is released; and may also inform the UE that the upper layer access barring is released.
Example two
On the basis of the first embodiment, the conditions that the UE needs to meet to perform the small data transmission at least include:
1, the system information block contains relevant configuration information of small data transmission, such as duration information of a T390a timer, random access resource information for small data transmission and the like;
2 UE are configured with configuration information for small data transmissions, such as data bearers (DRBs) for transmitting small data, and associated configuration of the PDCP/RLC layer of the particular DRB or DRBs, or resource information for pre-configured uplink grants (Configured Uplink Grant) for transmitting small data, etc.;
the lower layers below the 3 RRC layer, e.g., physical layer, MAC layer, etc., indicate that conditions for starting small data transmission are satisfied, e.g., the detected level value satisfies the requirements, a time synchronization timer is running, etc.
In addition, the condition to be satisfied may be one or more of the following conditions:
condition 1: upper layers above the RRC layer, e.g. non-access layers, request to resume RRC connection;
condition 2: the data (the pending data in UL) to be transmitted in the uplink may be mapped to the radio bearer configured with the SDT or may be mapped to a radio bearer that may be used for the SDT;
condition 3: the UE receives a paging message carrying UE identity information (UE identity), which may preferably be an I-RNTI. And information indicating the UE to start/execute small data transmission is also carried in the paging message.
Example III
On the basis of example two, a further embodiment of condition 3 may be:
the UE receives the paging message;
where the received paging message contains (include) one or more paging records (paging records), preferably these paging records may be divided into at least two packets (or belong to at least two list lists), one of which is defined (or list), referred to herein as group a, small data transmissions may be employed, and embodiments may be:
in one or more paging records belonging to group a, if there is a match between a UE identity (include) contained in one paging record and a stored UE identity of the UE, for example, I-RNTI, then the paging message may be considered to carry information indicating that the UE starts/performs small data transmission, or condition 3 described above is satisfied, then the UE may start an RRC connection recovery procedure, and in this recovery procedure, since condition 3 is satisfied, if other conditions are also satisfied, then the condition for the UE to perform small data transmission is satisfied;
if there is a paging record that contains a UE identity that matches the UE identity stored by the UE, e.g. I-RNTI, in one or more paging records of the other group (not group a), then the UE may be considered to have no information in the paging message received by the UE that instructs the UE to initiate/perform small data transmission, or condition 3 described above cannot be met, then the UE may initiate an RRC connection recovery procedure, and in this recovery procedure, the condition for performing small data transmission cannot be met because condition 3 is not met.
Example IV
On the basis of example two, a further embodiment of condition 3 may be:
the UE receives an RRC reconfiguration message (RRC Reconfiguration Message) or an RRC connection release message (RRC Release Message) in a connected state, wherein the message contains at least two UE identifications, namely a UE identification-1 and a UE identification-2, and the UE stores the two UE identifications;
the UE receives the paging message;
when the received paging message contains the same UE identifier (included) as the UE identifier-1 stored in the UE or matches (match), the UE triggers/starts an RRC connection recovery flow (initiate the RRC connection resumption procedure);
when the received paging message contains the same (included) UE identity as the UE-stored UE identity-2, or matches with each other, the UE triggers/starts an RRC connection resume procedure, and in this procedure, small data transmission may be started/executed, or it is considered that the UE receives information carrying an instruction to the UE to start/execute small data transmission in the paging message.
The UE identity-1 may be an I-RNTI, which is a radio network temporary identity of the UE in an inactive state, and the UE identity-2 may be another RNTI, for example, an SDT-RNTI, which is a radio network temporary identity of the UE for small data transmission in the inactive state.
The present embodiment may also be implemented separately for indicating in the paging message whether the UE needs to make a small data transmission.
Example five
The difference from the first embodiment is that the timings of stopping T302 and T390 are different. One possible implementation may be:
the UE starts a random access procedure, when the random access procedure is successfully completed and the random access procedure is triggered by the SDT, for example, RACH resources for random access are used for the SDT, or RACH resources associated with the SDT, or upper layers above the MAC layer, for example, RRC layer indicates to trigger the random access procedure for the SDT, then the UE may stop timers T302 and T390 and perform the corresponding operations as described in example one.
Specific embodiments may be: the UE starts a random access procedure, when the random access procedure is successfully completed, and the random access procedure is triggered by the SDT, the MAC layer of the UE indicates to the upper layer that the SDT-triggered random access procedure is successfully completed, the RRC layer of the UE stops T302 and T390 after receiving the indication information, and performs the corresponding operations as described in embodiment one.
Example six
The difference from the first embodiment is that the timings of stopping T302 and T390 are different. One possible implementation may be:
the UE makes an initial transmission, i.e. sends a first transmission containing CCCH information to the network side, on a preconfigured uplink grant (configured UL grant) for SDT. After the first transmission, when the first downlink assignment (receive the first downlink assignment) is received, then the UE may stop timers T302 and T390 and perform the corresponding operations as described in embodiment one.
Specific embodiments may be: the UE makes an initial transmission, i.e. sends a first transmission containing CCCH information to the network side, on a preconfigured uplink grant (configured UL grant) for SDT. After the first transmission, when the first downlink assignment (receive the first downlink assignment) is received, the MAC layer of the UE indicates to the upper layer that the SDT initial transmission is completed or completed successfully, and the RRC layer of the UE stops T302 and T390 and performs the corresponding operations after receiving the indication information as described in embodiment one.
Fig. 4 shows a block diagram of a user equipment 400 according to an embodiment of the invention. As shown in fig. 4, the user equipment 400 includes a processor 401 and a memory 402. The processor 401 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like. The memory 402 may include, for example, volatile memory (such as random access memory RAM), a Hard Disk Drive (HDD), non-volatile memory (such as flash memory), or other memory systems. The memory 402 has stored thereon program instructions. Which, when executed by the processor 401, may perform the above-described method in a user equipment as described in detail in the present invention.
The program running on the apparatus according to the present invention may be a program for causing a computer to realize 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 a volatile store such as a random access memory RAM, a Hard Disk Drive (HDD), a nonvolatile store such as a flash memory, or other memory system.
A program for realizing the functions of the embodiments of the present invention may 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 term "computer system" as used herein may be a computer system embedded in the device and may include an operating system or hardware (e.g., peripheral devices). The "computer-readable recording medium" may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium in which a program is stored dynamically at a short time, or any other recording medium readable by a computer.
The various features or functional modules of the apparatus used in the embodiments described above may be implemented or performed by circuitry (e.g., single-chip or multi-chip integrated circuits). Circuits designed to perform the functions described herein may include a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The circuit may be a digital circuit or an analog circuit. Where new integrated circuit technologies are presented as an alternative to existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present invention may also be implemented using these new integrated circuit technologies.
Furthermore, the present invention is not limited to the above-described embodiments. Although various examples of the embodiments have been described, the present invention is not limited thereto. Fixed or non-mobile electronic devices installed indoors or outdoors may be used as terminal devices or communication devices such as AV devices, kitchen devices, cleaning devices, air conditioners, office devices, vending machines, and other home appliances, etc.
As above, the embodiments of the present invention have been described in detail with reference to the accompanying drawings. However, the specific structure is not limited to the above-described embodiment, and the present invention also includes any design modification without departing from the gist of the present invention. In addition, various modifications can be made to the present invention within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the different embodiments are also included in the technical scope of the present invention. Further, the components having the same effects described in the above embodiments may be replaced with each other.

Claims (10)

1. A method performed by a user equipment, which is a method of a small data transmission procedure performed by a user equipment UE, wherein the small data transmission procedure is a procedure in which the UE in an RRC inactive state can communicate with a base station to transmit data belonging to a specific DRB, comprising the steps of:
when the RRC connection recovery procedure is triggered or started, the UE determines whether small data transmission can be performed;
if the condition for performing small data transmission is satisfied, the UE performs at least one of the following operations:
starting a timer T319a for managing the RRC connection recovery procedure;
if the timer T302 for access control is running, the timer T302 is stopped;
if the timer T390 for access control is running, the timer T390 is stopped,
if the condition for performing the small data transmission cannot be satisfied, the UE starts a timer T319 for managing the RRC connection restoration procedure, and when transmitting an RRC restoration request message to the base station and receiving an RRC restoration or an RRC configuration message as a response message, the UE performs at least one of the following operations:
if the timer T302 is running, the timer T302 is stopped;
if the timer T390 is running, the timer T390 is stopped.
2. The method performed by a user equipment of claim 1, further comprising the step of:
in the case where the condition for performing small data transmission is satisfied,
when the timer T302 is stopped, the UE determines that the access prohibition of the AC whose corresponding T390 timer is not running is released;
when the timer T390 is stopped, the UE determines that access prohibition of AC corresponding to the timer is released.
3. The method performed by a user equipment according to claim 2, further comprising the step of:
informing the UE that the upper layer access barring is released.
4. The method performed by a user equipment of claim 1, further comprising the step of:
in the case where the condition for performing small data transmission cannot be satisfied,
when the timer T302 is stopped, the UE determines that the access prohibition of the AC whose corresponding T390 timer is not running is released;
when the timer T390 is stopped, the UE determines that access prohibition of AC corresponding to the timer is released.
5. The method performed by the user equipment of claim 4, further comprising the step of:
informing the UE that the upper layer access barring is released.
6. The method performed by a user equipment according to any one of claims 1 to 5, wherein,
the conditions met by the UE for performing small data transmissions include at least:
the system information block contains the relevant configuration information of small data transmission;
the UE is configured with configuration information for small data transmission;
the lower layer of the RRC layer indicates that the condition for starting small data transmission is satisfied.
7. The method performed by a user equipment according to any one of claims 1 to 5, wherein,
the conditions met by the UE for performing small data transmissions include at least:
the upper layer of the RRC layer requests recovery of the RRC connection;
the data to be transmitted in the uplink can be mapped to a radio bearer configured with small data transmission or can be mapped to a radio bearer which can be used for small data transmission;
the UE receives a paging message, wherein the paging message carries the identification information of the UE.
8. The method performed by the user equipment of claim 7, wherein,
the paging message also carries information indicating that the UE starts or performs small data transmission.
9. The method performed by the user equipment of claim 7, wherein,
the paging message contains one or more paging records that are divided into at least two packets, wherein one of the packets is capable of small data transmissions.
10. A user equipment, comprising:
a processor; and
a memory having instructions stored thereon,
the instructions, when executed by the processor, cause the user equipment to perform the method according to any one of claims 1 to 9.
CN202210844588.3A 2022-07-18 2022-07-18 Method performed by user equipment and user equipment Pending CN117479315A (en)

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PCT/CN2023/107681 WO2024017184A1 (en) 2022-07-18 2023-07-17 Method executed by user equipment and user equipment

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KR20230038657A (en) * 2020-07-14 2023-03-21 삼성전자주식회사 Method and apparatus for processing response timer and cell reselection for small data transmission
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CN114258161B (en) * 2020-09-22 2024-01-19 华硕电脑股份有限公司 Method and apparatus for new data arrival for small data transfer in wireless communication
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