CN114189948A

CN114189948A - User equipment execution method and user equipment

Info

Publication number: CN114189948A
Application number: CN202010964315.3A
Authority: CN
Inventors: 张崇铭; 刘仁茂
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2022-03-15
Also published as: WO2022052888A1

Abstract

The invention provides a method executed by user equipment and the user equipment, wherein the method executed by the user equipment comprises the following steps: user Equipment (UE) starts an RRC connection recovery process and judges whether the RRC connection recovery process is triggered by small data transmission; in case the RRC connection recovery procedure is triggered by the small data transmission, the UE comparing a data amount of user data that needs to be transmitted with a preconfigured threshold value; when the data volume is above the threshold value, the UE sets a value of a timer T319 to X; when the data volume is smaller than the threshold value, the UE sets the value of a timer T319 as Y; the timer T319 is started and transmission of an RRC connection resume request message is started.

Description

User equipment execution method and user equipment

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a method performed by a user equipment and a corresponding user equipment.

Background

In order to shorten transmission delay and save signaling overhead, a UE entering an RRC inactive state (RRC INACTIVE STATE) may send a Transport Block (Transport Block) with a predetermined size and carrying data on a Preconfigured Uplink Resource (PUR). This transmission mode may be referred to as PUR transmission. And in the process of random access, transmitting the transport block carrying the user data in the message III or the message A. Both of these ways may be referred to as small data transmissions.

In order to enable the UE to perform data transmission in the inactive state, the UE first needs to resume drb (resume drb). The UE restores (Restore) the configuration of RRC (Restore from the stored UE AS context) and the state of the PDCP (Restore PDCP state) according to the stored context of the UE access layer, and then reconstructs the PDCP entity, thereby restoring the DRB.

Through the preparation, the UE can perform small data transmission in the currently camped cell. Such a cell may be referred to as a cell providing a small data transmission service. In such a cell, the UE may obtain the pre-configured uplink resource, or may obtain a resource for random access based on the system information broadcasted in the cell, so as to perform small data transmission.

However, in preparation for small data transmissions there may be the following: if the UE expects to complete the transmission of all data by sending one transport block, the size of the required transport block is larger than the pre-configured resource, or larger than the uplink resource scheduled by message three, or larger than the reserved resource of message a. That is, the transmission of all data cannot be completed by only one transmission. In this case, in order to avoid the UE entering the connected state and ensure that the UE completes the next data transmission in the INACTIVE state, the network side needs to design a corresponding mechanism to ensure the normal operation of the transmission.

Disclosure of Invention

In view of the foregoing problems in the prior art, an object of the present invention is to provide a method performed by a user equipment and a user equipment, which can reliably transmit user data of the user equipment UE by using small data transmission.

According to a first aspect of the present disclosure, there is provided a method performed by a user equipment UE, including: the UE starts an RRC connection recovery process and judges whether the RRC connection recovery process is triggered by small data transmission; in case the RRC connection recovery procedure is triggered by the small data transmission, the UE comparing a data amount of user data that needs to be transmitted with a preconfigured threshold value; when the data volume is above the threshold value, the UE sets a value of a timer T319 to X; when the data volume is smaller than the threshold value, the UE sets the value of a timer T319 as Y; the timer T319 is started and transmission of an RRC connection resume request message is started.

In the method executed by the user equipment UE in the first aspect, when the RRC connection recovery procedure is not triggered by the small data transmission, a value of the timer T319 is a value provided in system information.

In the method executed by the user equipment UE in the first aspect, the threshold may be a threshold broadcasted by the base station in a system information block or system information, or the threshold may also be a threshold carried by the base station in an RRC release message sent to the UE and used for indicating that the UE enters an INACTIVE state.

In the method performed by the UE according to the first aspect, when the UE receives an indication from the network side/the base station to indicate the UE to perform subsequent transmission, the UE may restart the timer T319.

In the method performed by the user equipment UE of the first aspect, the instructing the UE to perform the subsequent transmission may be an explicit instruction or an implicit instruction.

In the method performed by the UE according to the first aspect, when the UE receives an indication from the network side/base station to instruct the UE to perform a subsequent transmission, the UE may stop the operation of the timer T319, and start a subsequent transmission control STC timer.

In the method performed by the UE according to the first aspect, when the UE receives an RRC release message, or the UE receives an indication from a lower layer, indicates that a subsequent transmission is completed, or indicates that a connectionless data transmission is completed, the STC timer may be stopped.

In the method performed by the user equipment UE according to the first aspect, when the STC timer runs out of time, the UE performs an operation of entering an RRC idle state.

According to a second aspect of the present disclosure, there is provided a method performed by a user equipment UE, comprising: when the condition of small data transmission is met, the UE compares the data quantity of user data needing to be transmitted with a pre-configured threshold value; when the data volume is greater than or equal to the threshold value, the UE sets a value of a timer T319 to X; when the data volume is smaller than the threshold value, the UE sets a value of a timer T319 to Y; the UE triggers an RRC connection recovery procedure, starts the timer T319 in the RRC connection recovery procedure, and starts transmission of an RRC connection recovery request message.

According to a third aspect of the present disclosure, there is provided a user equipment UE, comprising: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, perform a method performed by the user equipment according to the context.

Drawings

Fig. 1 is a schematic diagram illustrating a process flow in a first embodiment of the present disclosure.

Fig. 2 is a block diagram representing a user equipment UE to which the present disclosure relates.

In the drawings, the same or similar structures are identified by the same or similar reference numerals.

Detailed Description

The invention is described in detail below with reference to the figures 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 technologies not directly related to the present invention are omitted to prevent confusion of understanding of the present invention.

Before describing in detail, several terms mentioned in the present invention will be explained as follows. Unless otherwise indicated, the terms referred to in the present invention have the following meanings:

UE User Equipment

NR New Radio New generation wireless technology

LTE Long Term Evolution (LTE) Long Term Evolution (Long Term Evolution) technology

eLTE enhanced Long Term Evolution technology

RRC Radio Resource Control (layer)

MAC Medium Access Control (layer)

MAC CE MAC Control Element

SDAP Service Data addition Protocol Service Data adaptive layer Protocol

In the following, an NR mobile communication system and its subsequent evolution are taken as an example application environment, and a base station and a UE device supporting NR are taken as an example, and a plurality of embodiments according to the present invention are specifically described. However, it should be noted that the present invention is not limited to the following embodiments, but is applicable to more other wireless communication systems, such as an LTE, a communication system, or an NB-Iot system, or an LTE-M system. But also to other base stations and UE devices, such as those supporting LTE/NB-Iot/LTE-M.

When the UE is in INACTIVE state, an upper layer of the UE, e.g., a non-access stratum, may request the UE to resume RRC connection (request resume of an RRC connection). Such requests typically occur when data arrives at the upper layers. .

Based on the request, the UE may trigger an RRC connection recovery procedure. In this process, the UE sends an RRC connection recovery request message to the base station/network side.

If the UE does not support or adopt the small data transmission mode, the UE starts the timer T319 and sends an RRC connection recovery request message to the network side, and during the operation of T319, when the UE receives the RRC connection recovery message sent by the network side, the UE stops T319, enters a connected state, and performs a corresponding operation. During the operation of T319, the UE may also receive an RRC connection reject message sent from the network side, and then the UE also stops T319 and returns to the previous INACTIVE state, or enters an idle state. If the UE does not receive the response message from the network side, T319 will run until timeout. Once T319 runs out of time, the UE may consider that this connection recovery request fails, and the UE may return to the previous INACTIVE state or enter an idle state. As can be seen, T319 is a timer for RRC connection recovery procedure.

If the UE supports and decides to use the small data transmission mode, the UE may send a MAC PDU in the PUR or random access procedure, where the MAC PDU carries the RRC connection recovery request message and part or all of the user data.

If such a MAC PDU cannot accommodate all the data of the user, the UE needs to transmit this MAC PDU and then needs to perform one or several transmissions to finish all the data transmission. The next transmission may be referred to as a Subsequent Transmission (ST).

It can be seen that the small data transmission process can be divided into a first transmission and a subsequent transmission. The MAC PDU transmitted for the first time carries at least an RRC connection recovery request message, and optionally a part of user data, or information about the amount/size of all user data to be transmitted.

The existing setting of the duration of T319 only considers the message interaction operations of sending a request and receiving a response by the UE, and the UE can complete the connection recovery procedure quickly and stop T319. However, in small data transmission, since there is subsequent transmission, the time for the RRC connection recovery procedure to complete becomes long, and therefore there are cases in which: the lower layer of the UE is still performing subsequent transmission of small data, and the T319 timer set by the upper layer of the UE has timed out, so that the upper layer considers that the connection recovery has failed.

In order to solve the problems in the prior art, several embodiments of the present invention are described in detail below, and the following embodiments are only examples provided for easy understanding of the present invention and do not limit the present invention.

Example one

Hereinafter, a first embodiment of the present disclosure will be described in detail. Fig. 1 is a schematic diagram illustrating a process flow in a first embodiment of the present disclosure.

As shown in fig. 1, in step S1, the UE starts (initiation) an RRC connection recovery procedure, in which the UE determines whether the procedure is triggered by small data transmission.

In case that the RRC connection recovery procedure is triggered by small data transmission, the UE compares the data amount (data volume) of the user data that needs to be transmitted with a pre-configured threshold value in step S2 of fig. 1.

As a result of the comparison in step S2, if the data amount to be transmitted is greater than (or not less than) the preconfigured threshold, as shown in step S3 of fig. 1, the UE sets the value of T319 to X; if the amount of data to be transmitted is smaller than (or does not exceed) the preconfigured threshold, the UE sets the value of T319 to Y, as shown in step S4 of fig. 1.

In addition, as a result of the determination in step S1, if the RRC connection recovery procedure is not triggered by small data transmission, the value of T319 is the value provided in the system information, and may be Y or Z.

Then, the UE may start (start) a timer T319, and a value of T319 is obtained based on the foregoing scheme; and initiates (initiate) transmission of an RRC connection resume request message, including specifically setting the message content, and delivering to the lower layer for transmission.

In the above process, "the UE determines whether the process is triggered by small data transmission," where the small data transmission refers to a process in which the UE performs data transmission in a non-connected state or in an INACTIVE state, that is, the UE performs data transmission without performing a connected state.

The "preconfigured threshold" used for comparison in the above process may be a threshold broadcasted by the base station in the system information block or the system information; the RRC release message may also be carried by the base station in an RRC release message sent to the UE for instructing the UE to enter the INACTIVE state. Its unit may be a byte (byte) or a bit (bit), etc.

Accordingly, the "data amount of user data" used for comparison refers to the size of user data that needs to be transmitted by the UE side, and may be the data amount counted in the PDCP layer, the data amount counted in the RLC layer, the data amount counted in the MAC layer, or the data amount converted into the size of the transport block by the UE. Such user data may be data from the DRB alone or may be data amount considering an RRC connection recovery request message that needs to be transmitted.

In the above process, the value X of T319 is generally larger than Y. The value X may be a value configured in advance and used for a subsequent transmission (subsequent transmission) scene. The pre-configured method may be broadcast in a system information block or system information, or may be carried by the base station in an RRC release message sent to the UE for instructing the UE to enter an INACTIVE state. And the value Y is typically broadcast in a system information block or system information.

T319 can also take the value Y or Z. Wherein Y refers to the RRC connection recovery procedure for small data transmission triggers and Z refers to the RRC connection recovery procedure for non-small data transmission triggers. Of course, it is also possible to make no distinction, in which case Y is equal to Z.

Modification of the first embodiment

As a modification of the first embodiment, the method performed by the user equipment UE of the present disclosure may also be implemented as follows.

When user data arrives, if various conditions for small data transmission are met, the UE compares the data volume (data volume) of the user data needing to be transmitted with a pre-configured threshold value.

If the data volume needing to be transmitted is larger than (or not smaller than) a pre-configured threshold value, the UE sets the value of the T319 as X; if the amount of data to be transmitted is less than (or does not exceed) the pre-configured threshold, the UE sets the value of T319 to Y.

After completing the above setting operation, the UE triggers/initiates (initiation) an RRC connection recovery procedure, and in this procedure, starts T319 and starts transmission of an RRC connection recovery request message. Since the UE has set the value of T319 according to the above operation before triggering the RRC connection recovery procedure, the timer T319 can be started by obtaining the value of T319 based on the above scheme.

Example two

Hereinafter, a second embodiment of the present disclosure will be described in detail.

In the second embodiment, when user data arrives, if various conditions for small data transmission are satisfied, the UE may trigger/initiate (initiation) an RRC connection recovery procedure for small data transmission, and start T319 in this procedure.

During the transmission process, if the UE receives an indication from the network side/base station to instruct the UE to perform subsequent transmission (subsequent transmission), the UE restarts T319.

The indication to the UE to perform the subsequent transmission here may be an explicit or implicit indication.

For example, if the UE receives a MAC PDU in the random access procedure, where the MAC PDU carries an indication of subsequent transmission (subsequent transmission), the UE may indicate the subsequent transmission (subsequent transmission) to an upper layer, as the upper layer of the UE, and for example, the RRC layer restarts T319 after receiving the indication. Such an indication of a subsequent transmission (subsequent transmission) may be carried in one MAC CE or in a subheader of a MAC PDU. In this context, such an indication indicating that the UE performs subsequent transmission (subsequent transmission) may also be replaced by other indications, such as indicating that the UE performs connectionless data transmission, or indicating that the UE continues to perform data transmission, etc., and the upper layer of the UE receives such an indication of a lower layer delivery, and may restart T319.

For another example, after the UE sends the RRC connection recovery request message for small data transmission, the UE receives a response RRC message to the message, where the message carries configured Uplink grants (configured Uplink grant), and Uplink resources corresponding to the Uplink grants can be used for subsequent transmission (subsequent transmission). Then T319 may be restarted when the UE receives such RRC.

In particular, such RRC message may be an RRC release message. When the RRC release message carries information indicating a subsequent transmission (subsequent transmission), the UE may restart T319 upon receiving such an RRC release message, and optionally, consider the configured uplink grant carried in the message as active and for transmission (application of the configured grant as activated in the message). As an example, if the RRC release message does not carry information indicating a subsequent transmission (subsequent transmission), the UE performs other operations, such as stopping (stop) the operation of the T319.

The second embodiment can be used in combination with the first embodiment or alone.

EXAMPLE III

Hereinafter, a third embodiment of the present disclosure will be described in detail.

The difference between the third embodiment and the second embodiment of the present disclosure is that the UE replaces the operation of "restarting T319" in the second embodiment with "stopping (stop) the operation of T319, and starting a subsequent transmission control timer".

Specifically, when user data arrives, the UE may trigger/initiate (initiation) an RRC connection recovery procedure for small data transmission if various conditions for small data transmission are satisfied. And starts T319 in this process. During transmission, if the UE receives an instruction from the network side/base station to instruct the UE to perform subsequent transmission (subsequenttransmission), the UE stops (stop) the operation of the T319, and starts a subsequenttransmission (subsequenttransmission) control timer STC. The indication information may adopt the method mentioned in the second embodiment.

The advantage of such control is that it is not limited by the duration of T319, but manages the subsequent transmission (subsequent transmission) in the RRC connection recovery request procedure by defining a new timer, i.e., a Subsequent Transmission (STC) timer.

The UE may stop the STC timer from running when receiving the RRC release message;

when the UE receives an indication from a lower layer indicating that a subsequent transmission (subsequent transmission) is completed or indicating that a connectionless data transmission is completed, the operation of the STC timer may be stopped;

when the STC timer runs out of time, the UE performs an operation of entering an RRC idle state, for example, resetting the MAC layer, stopping all timers, discarding any key, and the like, and sets a release cause value to an RRC recovery failure (RRC Resume failure)

In the above process, "the lower layer indicates that the subsequent transmission (subsequent transmission) is completed", may be that the UE receives acknowledgement information sent by the physical layer, for example, Downlink Control information (Downlink Control information) indicating acknowledgement, and then indicates the uplink layer, for example, indicates the RRC layer.

Such an STC timer may also be set at the MAC layer. For example, if the UE receives an indication from the network side/base station to instruct the UE to perform a subsequent transmission (subsequent transmission), the UE may start an STC timer at the MAC layer and instruct the subsequent transmission to the upper layer. The upper layer stops T319 based on the indication.

During the operation of the STC timer, if the UE receives the confirmation information of the data transmitted by the UE from the network side, restarting the STC timer; such acknowledgement information may be positive acknowledgement (positive acknowledgement), indicating that the network side acknowledges receipt; it may also be a negative acknowledgement (negative acknowledgement) indicating that the network side did not receive, or that decoding was erroneous. The STC timer may also be restarted if the UE receives a schedule of uplink resources for retransmission of data.

When the STC timer runs out of time, the transmission may be considered complete and this information is indicated to the upper layers of the UE. Preferably, the UE may consider that the transmission is successfully completed.

When the UE receives the acknowledgement information sent by the network side, the transmission is acknowledged to be completed, then the UE may stop the STC timer and may indicate this information to the upper layer of the UE.

Example four

In the fourth embodiment, a user equipment UE of the present disclosure is briefly described. Fig. 2 is a block diagram schematically illustrating a user equipment UE according to the present invention. As shown in fig. 2, the user equipment UE40 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 (e.g., random access memory RAM), a Hard Disk Drive (HDD), non-volatile memory (e.g., flash memory), or other memory, among others. The memory 402 has stored thereon program instructions. Which when executed by the processor 401 may perform the above-described method performed by the user equipment as detailed in the present invention.

EXAMPLE five

In the foregoing embodiment, taking T319 as an example, how the UE manages the transmission procedure when the RRC connection recovery procedure is used for small data transmission. Another situation may also be that a timer is newly defined, which is specially used for small data transmission, and the specific implementation manner is the same as T319 in the foregoing embodiment, and the timer is started when the RRC connection recovery procedure is used for small data transmission; and when the RRC connection recovery procedure is not used for small data transmission, the existing T319 timer is used.

The program running on the apparatus according to the present invention may be a program that causes 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 memory (such as a random access memory RAM), a Hard Disk Drive (HDD), a nonvolatile memory (such as a flash memory), or other memory system.

A program for implementing 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 the 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 that stores a program for short-term dynamics, or any other recording medium that is readable by a computer.

Various features or functional blocks of the devices used in the above-described embodiments may be implemented or performed by circuitry (e.g., a single or multiple chip integrated circuits). Circuitry 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 have emerged as a replacement for 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.

Further, the present invention is not limited to the above-described embodiments. While 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.

As above, the embodiments of the present invention have been described in detail with reference to the accompanying drawings. However, the specific configuration is not limited to the above embodiment, and the present invention includes any design modification without departing from the gist of the present invention. In addition, the present invention can be variously modified 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, components having the same effects described in the above embodiments may be substituted for each other.

Claims

1. A method performed by a User Equipment (UE), comprising:

the UE starts an RRC connection recovery process and judges whether the RRC connection recovery process is triggered by small data transmission;

in case the RRC connection recovery procedure is triggered by the small data transmission, the UE comparing a data amount of user data that needs to be transmitted with a preconfigured threshold value;

when the data volume is above the threshold value, the UE sets a value of a timer T319 to X;

when the data volume is smaller than the threshold value, the UE sets the value of a timer T319 as Y;

the timer T319 is started and transmission of an RRC connection resume request message is started.

2. The method performed by the user equipment, UE, of claim 1,

in the case that the RRC connection recovery procedure is not triggered by the small data transmission, the value of the timer T319 is a value provided in system information.

3. The method performed by the user equipment, UE, of claim 1,

the threshold is a threshold broadcasted by the base station in a system information block or system information, or,

the threshold is a threshold carried by the base station in an RRC release message sent to the UE for indicating the UE to enter an INACTIVE state.

4. The method performed by the user equipment, UE, of claim 1,

and when the UE receives an indication from the network side/the base station to indicate the UE to perform subsequent transmission, the UE restarts the timer T319.

5. The method performed by the user equipment, UE, of claim 4,

an indication that instructing the UE to make the subsequent transmission is explicit or implicit.

6. The method performed by the user equipment, UE, of claim 1,

and when the UE receives an instruction from a network side/base station and instructs the UE to perform subsequent transmission, the UE stops the operation of the timer T319 and starts a subsequent transmission control STC timer.

7. The method performed by the user equipment, UE, of claim 6,

and stopping the STC timer when the UE receives an RRC release message or receives an instruction from a lower layer to indicate the completion of subsequent transmission or indicate the completion of connectionless data transmission.

8. The method performed by the user equipment, UE, of claim 6,

and when the STC timer runs out of time, the UE performs the operation of entering an RRC idle state.

9. A method performed by a User Equipment (UE), comprising:

when the condition of small data transmission is met, the UE compares the data quantity of user data needing to be transmitted with a pre-configured threshold value;

when the data volume is greater than or equal to the threshold value, the UE sets a value of a timer T319 to X;

when the data volume is smaller than the threshold value, the UE sets a value of a timer T319 to Y;

the UE triggers an RRC connection recovery procedure, starts the timer T319 in the RRC connection recovery procedure, and starts transmission of an RRC connection recovery request message.

10. A user equipment, UE, comprising:

a processor; and

a memory storing instructions;

wherein the instructions, when executed by the processor, perform the method of any of claims 1 to 9.