WO2023108420A1

WO2023108420A1 - Method and apparatus for determining validity of timing advance, device, and storage medium

Info

Publication number: WO2023108420A1
Application number: PCT/CN2021/137936
Authority: WO
Inventors: 林雪; 尤心; 李海涛
Original assignee: Oppo广东移动通信有限公司
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2023-06-22
Also published as: CN118104354A

Abstract

The present application relates to the field of wireless communications, and discloses a method and apparatus for determining validity of timing advance (TA), a device, and a storage medium. The method is applied to a terminal device. The method comprises: after initiating a CG-SDT, starting a first timer, and maintaining the validity of TA in a subsequent transmission stage by means of the first timer; or, after initiating the CG-SDT, maintaining the validity of the TA in the subsequent transmission stage on the basis of a first RSRP variation.

Description

Method, device, equipment and storage medium for determining effectiveness of timing advance

technical field

The present application relates to the field of wireless communication, and in particular to a method, device, device and storage medium for determining the effectiveness of timing advance.

Background technique

In the RRC_INACTIVE state (that is, the inactive state), the terminal device supports data transmission through Small Data Transmission (SDT). Moreover, in the process of SDT, subsequent transmission is supported.

In the subsequent transmission phase of uplink small data transmission (ie CG-SDT) based on pre-configured resources (such as CG type1), the terminal device can continue to perform data transmission using CG resources or DG resources. At this time, how does the terminal device determine the timing advance ( Timing Advance, TA) is effective, related technologies have not yet provided a better solution.

Contents of the invention

Embodiments of the present application provide a method, device, device, and storage medium for determining the effectiveness of timing advance. Described technical scheme is as follows:

According to one aspect of the present application, a method for determining the effectiveness of a timing advance is provided, the method comprising:

After initiating the CG-SDT, start a first timer, and use the first timer to maintain the validity of the TA in the subsequent transmission phase;

or,

After the CG-SDT is initiated, the validity of the TA in the subsequent transmission phase is maintained based on a first reference signal received power (Reference Signal Receiving Power, RSRP) variation.

sending a first feedback message to the terminal device;

Wherein, the first feedback message is used for the terminal device to determine to start the first timer after initiating the CG-SDT, and the first timer is used for maintaining the validity of the TA in the subsequent transmission phase.

According to one aspect of the present application, a device for determining the validity of timing advance is provided, the device comprising: a validity maintenance module;

The validity determination module is configured to start a first timer after initiating the CG-SDT, and use the first timer to maintain the validity of the TA in the subsequent transmission phase;

or,

The validity maintenance module is configured to maintain the validity of the TA in the subsequent transmission phase based on the first RSRP variation after the CG-SDT is initiated.

According to one aspect of the present application, an apparatus for determining the validity of timing advance is provided, and the apparatus includes: a message sending module;

The message sending module is configured to send a first feedback message to the terminal device;

According to one aspect of the present application, a terminal device is provided, and the terminal device includes: a processor; wherein,

The processor is configured to start a first timer after initiating the CG-SDT, and use the first timer to maintain the validity of the TA in the subsequent transmission phase;

or,

The processor is configured to maintain the validity of the TA in the subsequent transmission phase based on the first RSRP variation after the CG-SDT is initiated.

According to one aspect of the present application, a network device is provided, and the network device includes: a transceiver; wherein,

The transceiver is configured to send a first feedback message to the terminal device;

According to one aspect of the present application, a computer-readable storage medium is provided, wherein executable instructions are stored in the readable storage medium, and the executable instructions are loaded and executed by a processor to achieve timing advance as described in the above aspect method of determining effectiveness.

According to an aspect of an embodiment of the present application, a chip is provided, the chip includes a programmable logic circuit and/or program instructions, and when the chip is run on a computer device, it is used to realize the timing advance described in the above aspect method of determining effectiveness.

According to one aspect of the present application, a computer program product is provided. When the computer program product is run on a processor of a computer device, the computer device is made to execute the method for determining the validity of timing advance described in the above aspects.

The technical solutions provided by the embodiments of the present application at least include the following beneficial effects:

For the subsequent transmission phase of CG-SDT, the terminal device can maintain the validity of the TA through the timer, and can also maintain the validity of the TA through the RSRP variation, thus providing a way to determine the validity of the TA, so that the terminal device Uplink transmission can be performed based on a valid TA.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a flow chart of uplink advance data transmission provided by an exemplary embodiment of the present application;

FIG. 2 is a flow chart of pre-configured uplink resource transmission provided by an exemplary embodiment of the present application;

Fig. 3 is a block diagram of a communication system provided by an exemplary embodiment of the present application;

FIG. 4 is a flowchart of a method for determining the validity of timing advance provided by an exemplary embodiment of the present application;

FIG. 5 is a flowchart of a method for determining the validity of timing advance provided by an exemplary embodiment of the present application;

FIG. 6 is a flowchart of a method for determining the validity of timing advance provided by an exemplary embodiment of the present application;

FIG. 7 is a flowchart of a method for determining the validity of timing advance provided by an exemplary embodiment of the present application;

Fig. 8 is a schematic diagram of a method for determining the effectiveness of timing advance provided by an exemplary embodiment of the present application;

Fig. 9 is a structural block diagram of an apparatus for determining the validity of timing advance provided by an exemplary embodiment of the present application;

Fig. 10 is a structural block diagram of an apparatus for determining the validity of timing advance provided by an exemplary embodiment of the present application;

Fig. 11 is a schematic structural diagram of a communication device provided by an exemplary embodiment of the present application.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.

First, a brief introduction to the nouns involved in the embodiments of this application:

Early Data Transmission (EDT):

In Long Term Evolution (LTE), the EDT process is introduced, which can be understood as a small data transmission process. During this process, the terminal device may always remain in an idle state (RRC_IDLE) or a suspended state (RRC_SUSPEND) or an inactive state (RRC_INACTIVE) to complete the transmission of uplink and/or downlink small data packets. In terms of configuration, the network will configure a maximum transmission block threshold (TB size) allowed by the current network on the System Information Block 2 (SIB2). The terminal device judges the amount of data to be transmitted. If it is smaller than the broadcast The maximum TB size, the terminal device can initiate EDT transmission; otherwise, the terminal device uses the normal connection establishment process and enters the connection state to transmit data.

If the cell where the terminal device initiates the uplink EDT is the same as the last serving cell, the base station can directly submit the uplink data to the For the core network, the specific UP-EDT process is shown in Figure 1.

Preconfigured Uplink Resource (PUR):

In LTE, for Narrow Band Internet of Things (NB-IoT) and enhanced Machine Type Communication (eMTC) scenarios, a method of using PUR for data transmission in the RRC_IDLE state is introduced. The PUR is only valid in the currently configured cell, that is, when the terminal device detects a cell change and initiates random access in the new cell, the terminal device needs to release the PUR configured in the original cell. The PUR transmission process is similar to LTE UP-EDT, except that the process of sending a random access preamble to obtain TA and uplink grant (UL grant) is omitted. The specific air interface process of PUR transmission is shown in Figure 2.

Small Data Transmission (SDT):

In the 5G NR system, there are three RRC states, namely: RRC_IDLE (idle state), RRC_INACTIVE (inactive state), and RRC_CONNECTED (connected state).

Among them, the RRC_INACTIVE state is a new state introduced by the 5G system from the perspective of energy saving. For the terminal equipment in the RRC_INACTIVE state, the radio bearer and all radio resources will be released, but the UE access context is reserved on the terminal equipment side and the base station side to quickly restore RRC connection, the network usually keeps terminal devices with infrequent data transmission in the RRC_INACTIVE state.

Before R16, a terminal device in the RRC_INACTIVE state does not support data transmission. When uplink or downlink data arrives, the terminal device needs to restore the connection and release it to the inactive state after the data transmission is completed. For terminal devices with small data volume and low transmission frequency, such a transmission mechanism will cause unnecessary power consumption and signaling overhead. Therefore, R17 set up a project to carry out research on small data transmission under RRC_INACTIVE. The project goals mainly have two directions: small data transmission based on random access (two-step/four-step) (ie RA-SDT) and based on pre-configured resources (such as CG type1) small data transmission (i.e. CG-SDT).

For CG-SDT, terminal devices can directly use uplink resources pre-configured by the network to transmit data. Since the random access procedure is omitted, the terminal device needs to ensure that there is a valid timing TA when initiating CG-SDT. According to the discussion of 3GPP RAN2 work, the methods for terminal equipment to determine whether TA is valid include:

-Introduce a timer. During the running of the timer, TA is considered to be valid; Note: The timer is a new timer introduced for CG-SDT (the timer will be described later as SDT-TAT), which is different from the terminal in the connected state Timing Advance Timer (TAT) for equipment maintenance.

-Introducing the RSRP change threshold, if the RSRP change of the terminal device does not exceed the threshold, the TA is considered valid.

CG-SDT resources are UE-dedicated resources, configured through UE-specific signaling; RA-SDT resources are cell-dedicated resources, included in system broadcast messages, and terminal devices in the current cell share RA-SDT resources. When terminal equipment selects the SDT type, it first judges whether the conditions for executing CG-SDT are met, including:

- All the data to be transmitted belongs to the radio bearer (Radio Bear, RB) that is allowed to trigger SDT, and the amount of data to be transmitted is not greater than the data amount threshold configured by the network.

- The downlink RSRP measurement result is not less than the RSRP threshold configured by the network for performing SDT.

- There are CG resources on the selected carrier and synchronization signal block (Synchronization Signal Block, SSB).

-TA is valid.

The SDT process supports subsequent (subsequent) transmission. For CG-SDT, subsequent transmission can be based on configured grant (Configured Grant, CG) or network-based dynamic scheduling (Dynamic Grant, DG). In the subsequent transmission stage, the terminal device can use CG/DG to continue the transmission to perform data transmission. Therefore, it is necessary to determine what method the terminal device uses to determine whether the TA is valid.

In view of the above problems, in the embodiment of this application, for the subsequent transmission phase of CG-SDT, the terminal device can maintain the validity of TA through the timer, and can also maintain the validity of TA through the RSRP variation, thus providing a certain The realization method of TA effectiveness.

FIG. 3 shows a block diagram of a communication system provided by an exemplary embodiment of the present application. The communication system may include: an access network 12 and a terminal device 14 .

The access network 12 includes several network devices 120 . The network device 120 may be a base station, and the base station is a device deployed in an access network to provide a terminal device with a wireless communication function. The base station may include various forms of macro base stations, micro base stations, relay stations, access points and so on. In systems using different wireless access technologies, the names of devices with base station functions may be different. For example, in LTE systems, they are called eNodeB or eNB; in 5G NR-U systems, they are called gNodeB or gNB. . As communications technology evolves, the description "base station" may change. For convenience in this embodiment of the present application, the above-mentioned devices that provide the wireless communication function for the terminal device 14 are collectively referred to as network devices.

The terminal device 14 may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to wireless modems, as well as various forms of user equipment, mobile stations (Mobile Station, MS) , terminal device (terminal device) and so on. For convenience of description, the devices mentioned above are collectively referred to as terminal devices. The network device 120 and the terminal device 14 communicate with each other through a certain air interface technology, such as a Uu interface. Optionally, the terminal device 14 supports performing a small data transmission process in an inactive state.

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Global System of Mobile Communication (GSM) system, Code Division Multiple Access (CDMA) system, wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (Time Division Duplex, TDD) system, Advanced Long Term Evolution (LTE-A) system, New Radio (NR) system, evolution system of NR system, LTE on unlicensed frequency band (LTE-based access to Unlicensed spectrum, LTE-U) system, NR-U system, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, Wireless Local Area Networks (Wireless Local Area Networks, WLAN), Wireless Fidelity (Wireless Fidelity, WiFi), next-generation communication systems or other communication systems, etc.

Generally speaking, the number of connections supported by traditional communication systems is limited and easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communication, but also support, for example, Device to Device (Device to Device, D2D) communication, Machine to Machine (M2M) communication, Machine Type Communication (MTC), Vehicle to Vehicle (V2V) communication and Vehicle to Everything (V2X) system, etc. The embodiments of the present application may also be applied to these communication systems.

Fig. 4 shows a flow chart of a method for determining the validity of timing advance provided by an exemplary embodiment of the present application. The method may be applied to a terminal device in a communication system as shown in FIG. 3, and the method may include the following step 410 or step 420:

Step 410: After initiating the CG-SDT, start the first timer, and maintain the validity of the TA in the subsequent transmission phase through the first timer.

Small Data Transmission (SDT) is a data transmission method configured for terminal equipment in an inactive state. The small data transmission process does not require an RRC connection to be established between the terminal device and the network device. For terminal equipment with small data volume and low transmission frequency, if the data transmission can only be performed after restoring the RRC connection with the network equipment through the connection establishment recovery process, the data transmission needs to return to the inactive state , the power consumption of the terminal equipment is relatively large. By performing a small data transmission process, the terminal device can avoid switching the connection state, thereby reducing the power consumption of the terminal device.

Small data transmission includes: small data transmission based on pre-configured resources (Configured Grant, CG) (namely CG-SDT); or, small data transmission process based on random access (namely RA-SDT).

In the embodiment of the present application, the terminal device initiates CG-SDT, and utilizes resources pre-configured by the network device to perform data transmission. The SDT process supports subsequent (subsequent) transmission, and the subsequent transmission stage refers to that the terminal device continues to send/receive data in an inactive state after completing the first uplink transmission.

Wherein, the first timer is a timer used to maintain the validity of the TA in the subsequent transmission phase of the CG-SDT. Exemplarily, during the operation of the first timer in the subsequent transmission phase of CG-SDT, the TA is considered valid.

Optionally, the first timer includes: a timer introduced for the CG-SDT; or, the first timer includes: a timer introduced for a terminal device in a connected state.

That is, the first timer may be a timer dedicated to CG-SDT configured by the network device for the terminal device, and the timer may be recorded as SDT-TAT, or may be the TAT used by the terminal device in the connected state.

Step 420: After initiating the CG-SDT, maintain the validity of the TA in the subsequent transmission phase based on the first RSRP delta.

Wherein, the first RSRP change amount is the RSRP change amount determined by the RSRP measurement result before the terminal device performs data transmission in the subsequent transmission phase of the CG-SDT.

Optionally, maintaining the validity of the TA in the subsequent transmission phase based on the first RSRP variation includes: comparing the first RSRP variation with the RSRP threshold, and if the first RSRP variation is not greater than the RSRP threshold, the TA is considered valid.

Optionally, the RSRP threshold is configured by the network device, or is predefined in the protocol standard.

Exemplarily, before step 410, the terminal device in the connected state receives the first message sent by the network device, and the first message includes an RSRP threshold for judging whether the TA is valid; in addition, the first message also includes at least the CG - SDT resource configuration, the first message may be an RRCRelease message.

To sum up, in the technical solution provided by this embodiment, for the subsequent transmission phase of CG-SDT, the terminal device can maintain the validity of TA through the timer, and can also maintain the validity of TA through the variation of RSRP, thus providing An implementation manner of determining the validity of the TA is provided, so that the terminal device can perform uplink transmission based on the valid TA.

In an optional embodiment based on FIG. 4 , when initiating a CG-SDT, the terminal device confirms the validity of the TA through the RSRP variation.

Fig. 5 shows a flow chart of a method for determining the validity of timing advance provided by an exemplary embodiment of the present application. The method may be applied to a terminal device in a communication system as shown in FIG. 3 , and the method may include the following steps 510 to 530:

Step 510: When initiating the CG-SDT, confirm the validity of the TA through the second RSRP variation.

It can be understood that for RA-SDT, the terminal device can obtain a valid TA through the random access process, while for CG-SDT, since the random access process is not included, the terminal device needs to ensure that there is a valid TA when initiating CG-SDT. the TA.

In the embodiment of the present application, when initiating the CG-SDT, the terminal device confirms the validity of the TA through the second RSRP variation.

Wherein, the second RSRP change amount is the RSRP change amount determined by the terminal device through the RSRP measurement result when judging whether to initiate the CG-SDT.

Optionally, confirming the validity of the TA through the second RSRP variation includes: comparing the second RSRP variation with the RSRP threshold, and if the second RSRP variation is not greater than the RSRP threshold, the TA is considered valid.

Optionally, step 510 includes:

S11. Obtain a second RSRP variation based on the third RSRP measurement result and the fourth RSRP measurement result.

Wherein, the third RSRP measurement result is the RSRP measurement result when the third timing advance command is received, and the third timing advance command is the timing advance command received last time; the fourth RSRP measurement result is the RSRP measurement result corresponding to the judgment time point , the judging time point is the time point for judging whether to initiate the CG-SDT.

S12. If the second RSRP change amount is not greater than the RSRP threshold, confirm that the TA corresponding to the judgment time point is valid.

Optionally, the RSRP threshold includes: the first sub-RSRP threshold, the first sub-RSRP threshold is the threshold corresponding to the RSRP change amount as an increase; the second sub-RSRP threshold, the second sub-RSRP threshold is the RSRP change amount corresponding to the decrease amount threshold.

Wherein, the first sub-RSRP threshold and the second sub-RSRP threshold may be the same value or different values, which is not limited in the present application.

Exemplarily, the downlink RSRP measurement result when the terminal device receives the timing advance command for the last time is A; the downlink RSRP measurement result when the terminal device judges whether to trigger CG-SDT is B, then based on A and B, the second RSRP variation. In the case that the second RSRP variation is an increase, if the second RSRP variation is not greater than the first sub-RSRP threshold, then confirm that the current TA is valid; in the case of the second RSRP variation is a decrease, if the second If the variation of the RSRP is not greater than the second sub-RSRP threshold, it is confirmed that the current TA is valid.

Wherein, the above-mentioned timing advance command may be included in the RRCRelease message, which is used to instruct the terminal device to enter the inactive state, and may also be included in the indication message before RRCRelease, and the indication message may be any one of the following: downlink Control information (Downlink Control Information, DCI), media access control (Medium Access Control, MAC) control cell (Control Element, CE), RRC message.

It can be understood that when initiating CG-SDT, the terminal device confirms the validity of TA through the RSRP variation, and the validity judgment at this time only corresponds to the time point in which CG-SDT is initiated. Therefore, for subsequent CG-SDT In the subsequent transmission stage, the terminal device still needs to continue to judge the validity of the TA, and the terminal device determines the validity of the TA by performing the following step 520 or step 530 .

Step 520: After initiating the CG-SDT, start the first timer, and maintain the validity of the TA in the subsequent transmission phase through the first timer.

For the specific implementation manner of this step, reference may be made to the foregoing step 410, which will not be repeated here.

Step 530: After initiating the CG-SDT, maintain the validity of the TA in the subsequent transmission phase based on the first RSRP delta.

For the specific implementation manner of this step, reference may be made to the above-mentioned step 420, which will not be repeated here.

To sum up, the technical solution provided by this embodiment is aimed at the scenario where the terminal device confirms the validity of the TA through the RSRP variation when the terminal device initiates CG-SDT. Validity, to avoid unnecessary determination of the validity of the timing advance.

As mentioned above, in the embodiment of the present application, two different technical solutions are provided to judge the validity of the TA in the subsequent transmission phase of the CG-SDT, which will be further described below.

Solution 1: After initiating the CG-SDT, the terminal device starts the first timer, and maintains the validity of the TA in the subsequent transmission phase through the first timer.

Fig. 6 shows a flowchart of a method for determining the validity of timing advance provided by an exemplary embodiment of the present application. The method may be applied to a communication system as shown in FIG. 3, and the method may include the following steps 610 to 630:

Step 610: The network device sends a first feedback message to the terminal device.

Correspondingly, the terminal device receives the first feedback message sent by the network device.

Wherein, the first feedback message is used for the terminal device to determine whether to start the first timer after initiating the CG-SDT. The first timer is used to maintain the validity of the TA in the subsequent transmission phase.

Exemplarily, the first feedback message may be any one of the following: DCI, MACCE and RRC messages.

Step 620: The terminal device determines to start the first timer based on the first feedback message.

Step 630: The terminal device maintains the validity of the TA in the subsequent transmission phase through the first timer.

That is, after starting CG-SDT and receiving the first feedback message, the terminal device determines whether to start the first timer to maintain the validity of the TA in the subsequent transmission phase according to the content in the first feedback message.

In a possible implementation manner, the first feedback message includes: first indication information, where the first indication information is used to indicate to start the first timer.

Correspondingly, the terminal device maintains the validity of the TA in the subsequent transmission phase through the first timer, including: during the operation of the first timer, the terminal device confirms that the TA is valid in the subsequent transmission phase.

That is, when the first feedback message received by the terminal device includes the first indication information, the terminal device starts the first timer based on the first indication information, and considers that the currently maintained TA works.

In another possible implementation manner, the first feedback message includes: a first timing advance command, where the first timing advance command is used to indicate a timing advance measurement value N _TA .

Correspondingly, the terminal device maintains the validity of the TA in the subsequent transmission phase through the first timer, including: during the operation of the first timer, confirms that the adjusted TA is valid in the subsequent transmission phase, and the adjusted TA is based on N _TA Adjusted TA value.

It can be understood that TA is (N _TA +N _{TA offset} )Tc. Among them, N _TA is the measurement value sent to the terminal equipment as part of the timing advance command; N _TAOffset is a fixed value that varies according to different frequency bands and subcarrier spacing; Tc is the basic time unit of the communication system. In the case that the first timing advance command includes N _TA , the terminal device can obtain the adjusted TA based on the above formula.

That is, when the first feedback message received by the terminal device includes the first timing advance command, the terminal device determines the adjusted TA based on the N _TA in the first timing advance command, and starts the first timer accordingly, and During the running of the first timer, the adjusted TA is considered valid.

To sum up, in the technical solution provided by this embodiment, for the subsequent transmission phase of CG-SDT, the terminal device can maintain the validity of the TA through a timer, thereby providing an implementation method for determining the validity of the TA, so that the terminal device Uplink transmission can be performed based on a valid TA.

Solution 2: After initiating the CG-SDT, the terminal device maintains the validity of the TA in the subsequent transmission phase based on the first RSRP variation.

Fig. 7 shows a flowchart of a method for determining the validity of timing advance provided by an exemplary embodiment of the present application. The method may be applied to a terminal device in a communication system as shown in FIG. 3, and the method may include the following steps 710 to 720:

Step 710: After initiating the CG-SDT, based on the first RSRP measurement result and the second RSRP measurement result, obtain the first RSRP variation.

Wherein, the first RSRP measurement result is the RSRP measurement result when the second timing advance command is received, and the second timing advance command is the latest received timing advance command; the second RSRP measurement result is the RSRP measurement before the resource transmission opportunity arrives result.

Wherein, the resource transmission timing is a timing used for data transmission in a subsequent transmission phase. Optionally, the resource transmission opportunity includes: a CG opportunity; or, a DG opportunity; or, a physical uplink control channel (Physical Uplink Control Channel, PUCCH) transmission opportunity.

Step 720: If the first RSRP variation is not greater than the RSRP threshold, confirm that the TA corresponding to the resource transmission opportunity is valid.

That is, before each CG opportunity, DG opportunity, or PUCCH transmission opportunity for data transmission arrives, the terminal device completes TA validity verification based on the comparison between the RSRP variation and the RSRP threshold. For example, the terminal device has newly transmitted or retransmitted uplink data, and the terminal device completes TA validity verification before the CG opportunity, DG opportunity, or PUCCH transmission opportunity arrives.

Exemplarily, the downlink RSRP measurement result when the terminal device receives the timing advance command for the last time is C; the downlink RSRP measurement result of the terminal device before the CG opportunity or DG opportunity or PUCCH transmission opportunity arrives is D, then based on C and D, The first RSRP variation can be obtained. In the case where the first RSRP change amount is an increase, if the first RSRP change amount is not greater than the first sub-RSRP threshold, then confirm that the current TA is valid; when the first RSRP change amount is a decrease amount, if the first If the variation of the RSRP is not greater than the second sub-RSRP threshold, it is confirmed that the current TA is valid.

Wherein, the above-mentioned timing advance command may be included in the RRCRelease message, and the RRCRelease message is used to instruct the terminal device to enter the inactive state, and may also be included in the indication message before the RRCRelease, or in the indication message after the RRCRelease, the indication The message can be any one of the following: DCI, MACCE and RRC messages.

To sum up, the technical solution provided by this embodiment, for the subsequent transmission stage of CG-SDT, the terminal device can maintain the validity of TA through the variation of RSRP, thus providing an implementation method of determining the validity of TA, so that the terminal The device can perform uplink transmission based on the valid TA.

In the following, the technical solution provided by the present application will be exemplarily described with reference to FIG. 8 .

In a possible implementation manner, after the terminal device initiates the CG-SDT, it starts a first timer to maintain the validity of the TA in the subsequent transmission phase of the CG-SDT process.

Exemplary, as shown in (a) in Figure 8:

1) The terminal device receives a timing advance command (Timing Advance Command, TAC) at time t1, so that the terminal device adjusts the current TA to be the first TA based on the N _TA value in the TAC.

2) The terminal device receives the RRCRelease message at time point t2, thereby entering the RRC_INACTIVE state, and the RRCRelease message includes an RSRP threshold for judging whether the TA is valid.

3) At the time point t3, the terminal device judges whether certain conditions are met. If it is satisfied, the terminal device determines to initiate CG-SDT. The conditions include: TA is valid, and the terminal device judges whether TA is valid based on the comparison between the RSRP variation and the RSRP threshold .

4) At time t4, the terminal device receives the first feedback message, determines to start the first timer according to the content of the first feedback message, and uses the first timer to maintain the validity of the first TA.

5) At time t5, the terminal device receives the TAC again. Therefore, the terminal device adjusts the current TA to the second TA based on the N _TA value in the TAC, and the terminal device restarts the first timer accordingly, and uses the first timer The validity of the second TA is maintained.

6) At time t6, the terminal device receives the RRCRelease message, thereby ending the CG-SDT and terminating the first timer.

In another possible implementation, after the terminal device initiates CG-SDT, in the subsequent transmission phase of the CG-SDT process, before each data transmission based on the resource transmission opportunity, the effective value of the TA is judged by the amount of RSRP change. sex.

Exemplary, as shown in (b) in Figure 8:

1) The terminal device receives the TAC at time t1, so that the terminal device adjusts the current TA to the first TA based on the N _TA value in the TAC, and the RSRP measurement result at this time is the first RSRP measurement result.

4) The t4 time point is the time point when the resource transmission opportunity arrives, the RSRP measurement result before the t4 time point is the second RSRP measurement result, and the terminal device obtains the RSRP variation based on the second RSRP measurement result and the first RSRP measurement result, In the case that the variation of RSRP is not greater than the RSRP threshold, it is considered that the first TA is valid, so that the resource transmission opportunity is used for data transmission at the time point t4.

5) The t5 time point is the time point when another resource transmission opportunity arrives, the RSRP measurement result before the t5 time point is the third RSRP measurement result, and the terminal device obtains the RSRP change based on the third RSRP measurement result and the first RSRP measurement result If the amount of change in RSRP is not greater than the RSRP threshold, the first TA is considered valid, and data transmission is performed at time t5 using resource transmission opportunities.

It should be noted that the above method embodiments may be implemented individually or in combination, which is not limited in the present application.

In each of the above embodiments, the steps performed by the terminal device can independently implement the method for determining the validity of timing advance on the side of the terminal device, and the steps performed by the network device can independently implement the method of effectively determining the timing advance on the side of the network device. sex determination method.

Fig. 9 shows a structural block diagram of an apparatus for determining the validity of timing advance provided by an exemplary embodiment of the present application. The apparatus can be implemented as a terminal device, or can be implemented as a part of a terminal device. The apparatus includes: validity maintenance module 902;

or,

The validity maintenance module 902 is configured to maintain the validity of the TA in the subsequent transmission phase based on the RSRP variation of the first reference signal received power after the CG-SDT is initiated.

In an optional embodiment, the validity maintenance module 902 includes: a timer starting unit;

The timer starting unit is configured to receive a first feedback message sent by a network device; and determine to start the first timer based on the first feedback message.

In an optional embodiment, the first feedback message includes: first indication information, the first indication information is used to indicate to start the first timer; the validity maintenance module 902 includes: validity Determine the unit;

The validity determination unit is configured to confirm that the TA is valid in the subsequent transmission phase during the operation of the first timer.

In an optional embodiment, the first feedback message includes: a first timing advance command, where the first timing advance command is used to indicate a timing advance measurement value N _TA ; the validity maintenance module 902 includes: Validity determination unit;

The validity determination unit is configured to confirm that the adjusted TA is valid in the subsequent transmission phase during the operation of the first timer, and the adjusted TA is based on the N _TA Adjusted TA value.

In an optional embodiment, the first timer includes: a timer introduced for the CG-SDT;

or,

The first timer includes: a timer introduced for a terminal device in a connected state.

In an optional embodiment, the validity maintenance module 902 includes: a variation determination unit and a validity determination unit;

The variation determination unit is configured to obtain the first RSRP variation based on the first RSRP measurement result and the second RSRP measurement result;

The validity determination unit is configured to confirm that the TA corresponding to the resource transmission opportunity is valid when the first RSRP change amount is not greater than the RSRP threshold, and the resource transmission opportunity is in the subsequent transmission stage, using at the timing of data transmission;

Wherein, the first RSRP measurement result is the RSRP measurement result when the second timing advance command is received, and the second timing advance command is the latest received timing advance command; the second RSRP measurement result is the The RSRP measurement result before the resource transmission opportunity arrives.

In an optional embodiment, the resource transmission opportunity includes:

Pre-configure CG timing;

or,

Dynamic scheduling of DG timing;

or,

PUCCH transmission timing.

In an optional embodiment, the device further includes: a validity confirmation module;

The validity confirmation module is configured to confirm the validity of the TA through the second RSRP variation when initiating the CG-SDT.

In an optional embodiment, the validity confirmation module includes: a variation determination unit and a validity determination unit;

The variation determination unit is configured to obtain the second RSRP variation based on the third RSRP measurement result and the fourth RSRP measurement result;

The validity determining unit is configured to confirm that the TA corresponding to the judgment time point is valid when the second RSRP variation is not greater than the RSRP threshold, and the judgment time point is to judge whether to initiate the CG-SDT point in time;

Wherein, the third RSRP measurement result is the RSRP measurement result when the third timing advance command is received, and the third timing advance command is the latest timing advance command received; the fourth RSRP measurement result is the Determine the RSRP measurement result corresponding to the time point.

In an optional embodiment, the RSRP threshold includes:

A first sub-RSRP threshold, where the first sub-RSRP threshold is a threshold corresponding to an increase in the RSRP variation;

A second sub-RSRP threshold, where the second sub-RSRP threshold is a threshold corresponding to a decrease in the RSRP variation.

Fig. 10 shows a structural block diagram of an apparatus for determining the validity of timing advance provided by an exemplary embodiment of the present application. The apparatus can be implemented as a network device, or can be implemented as a part of the network device. The apparatus includes: message sending Module 1002;

The message sending module 1002 is configured to send a first feedback message to the terminal device;

Wherein, the first feedback message is used for the terminal device to determine to start the first timer after initiating the small data transmission CG-SDT based on pre-configured resources, and the first timer is used to maintain all The effectiveness of the TA.

In an optional embodiment, the first feedback message includes: first indication information, where the first indication information is used to indicate to start the first timer;

Wherein, the terminal device confirms that the TA is valid in the subsequent transmission phase during the operation of the first timer.

In an optional embodiment, the first feedback message includes: a first timing advance command, where the first timing advance command is used to indicate a timing advance measurement value N _TA ;

Wherein, during the operation of the first timer, the terminal device confirms that the adjusted TA is valid in the subsequent transmission phase, and the adjusted TA is a TA adjusted based on the N _TA value.

or,

In an optional embodiment, when the terminal device initiates the CG-SDT, it confirms the validity of the TA through a second RSRP variation.

In an optional embodiment, the terminal device obtains the second RSRP variation based on a third RSRP measurement result and a fourth RSRP measurement result;

When the second RSRP change amount is not greater than the RSRP threshold, the terminal device confirms that the TA corresponding to the judgment time point is valid, and the judgment time point is a time point for judging whether to initiate the CG-SDT;

In an optional embodiment, the RSRP threshold includes:

FIG. 11 shows a schematic structural diagram of a communication device (terminal device or network device) provided by an exemplary embodiment of the present application. The communication device 1100 includes: a processor 1101 , a transceiver 1102 and a memory 1103 .

The processor 1101 includes one or more processing cores, and the processor 1101 executes various functional applications by running software programs and modules.

The transceiver 1102 can be used for receiving and sending information, and the transceiver 1102 can be a communication chip.

The memory 1103 may be used to store a computer program, and the processor 1101 is used to execute the computer program, so as to implement various steps performed by the communication device in the foregoing method embodiments.

In addition, the memory 1103 can be implemented by any type of volatile or non-volatile storage device or their combination, and the volatile or non-volatile storage device includes but not limited to: random access memory (Random-Access Memory, RAM) And read-only memory (Read-Only Memory, ROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, EPROM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), flash memory or other solid-state storage technologies, compact disc read-only memory (CD-ROM), high-density digital video disc (Digital Video Disc, DVD) or other optical storage, tape cartridges, tapes, disks storage or other magnetic storage devices.

Wherein, when the communication device is implemented as a terminal device, the processor 1101 and the transceiver 1102 involved in the embodiment of the present application may execute the steps performed by the terminal device in any of the methods shown in FIG. 4 to FIG. 7 above, I won't repeat them here.

In a possible implementation manner, when the communication device is implemented as a terminal device,

The processor 1101 is configured to start a first timer after initiating the CG-SDT, and use the first timer to maintain the validity of the TA in the subsequent transmission phase;

or,

The processor 1101 is configured to maintain the validity of the TA in the subsequent transmission phase based on the first RSRP variation after the CG-SDT is initiated.

Wherein, when the communication device is implemented as a network device, the processor 1101 and the transceiver 1102 involved in the embodiment of the present application may execute the steps performed by the network device in any of the methods shown in FIG. 4 to FIG. 7 above, I won't repeat them here.

In a possible implementation manner, when the communication device is implemented as a network device,

The transceiver 1102 is configured to send a first feedback message to the terminal device;

In an exemplary embodiment, a computer-readable storage medium is also provided, the computer-readable storage medium stores at least one instruction, at least one program, a code set or an instruction set, the at least one instruction, the At least one section of program, the code set or instruction set is loaded and executed by the processor to implement the method for determining the effectiveness of timing advance provided by the above method embodiments.

In an exemplary embodiment, a chip is also provided, the chip includes a programmable logic circuit and/or program instructions, and when the chip is run on a communication device, it is used to realize the timing advance described in the above aspect method of determining effectiveness.

In an exemplary embodiment, there is also provided a computer program product, which, when run on a processor of a computer device, causes the communication device to execute the method for determining the validity of timing advance described in the above aspect.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above embodiments can be completed by hardware, and can also be completed by instructing related hardware through a program. The program can be stored in a computer-readable storage medium. The above-mentioned The storage medium mentioned may be a read-only memory, a magnetic disk or an optical disk, and the like.

The above are only optional embodiments of the application, and are not intended to limit the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the application shall be included in the protection of the application. within range.

Claims

A method for determining the validity of a timing advance TA, characterized in that the method comprises:

After initiating small data transmission CG-SDT based on pre-configured resources, start a first timer, and maintain the validity of the TA in the subsequent transmission phase through the first timer;

or,

After the CG-SDT is initiated, the validity of the TA in the subsequent transmission phase is maintained based on the variation amount of the first reference signal received power RSRP.
The method according to claim 1, wherein said starting the first timer comprises:

receiving a first feedback message sent by the network device;

Based on the first feedback message, determine to start the first timer.
The method according to claim 2, wherein the first feedback message includes: first indication information, and the first indication information is used to indicate to start the first timer;

The maintaining the validity of the TA in the subsequent transmission phase through the first timer includes:

During the running of the first timer, confirming that the TA is valid for the subsequent transmission phase.
The method according to claim 2, wherein the first feedback message comprises: a first timing advance command, and the first timing advance command is used to indicate a timing advance measurement value N TA ;

The maintaining the validity of the TA in the subsequent transmission phase through the first timer includes:

During the operation of the first timer, it is confirmed that the adjusted TA is valid in the subsequent transmission phase, and the adjusted TA is an adjusted TA value based on the N TA .
The method according to any one of claims 1 to 4, characterized in that,

The first timer includes: a timer introduced for the CG-SDT;

or,

The first timer includes: a timer introduced for a terminal device in a connected state.
The method according to claim 1, wherein the maintaining the validity of the TA in the subsequent transmission phase based on the first RSRP variation comprises:

Obtaining the first RSRP variation based on the first RSRP measurement result and the second RSRP measurement result;

When the first RSRP change amount is not greater than the RSRP threshold, confirm that the TA corresponding to the resource transmission opportunity is valid, and the resource transmission opportunity is an opportunity for data transmission in the subsequent transmission stage;

Wherein, the first RSRP measurement result is the RSRP measurement result when the second timing advance command is received, and the second timing advance command is the latest received timing advance command; the second RSRP measurement result is the The RSRP measurement result before the resource transmission opportunity arrives.
The method according to claim 6, wherein the resource transmission opportunity comprises:

Pre-configure CG timing;

or,

Dynamic scheduling of DG timing;

or,

Physical uplink control channel PUCCH transmission timing.
The method according to any one of claims 1 to 7, wherein the method further comprises:

When the CG-SDT is initiated, the validity of the TA is confirmed by the second RSRP variation.
The method according to claim 8, wherein the confirming the validity of the TA through the second RSRP variation comprises:

Obtaining the second RSRP variation based on the third RSRP measurement result and the fourth RSRP measurement result;

When the second RSRP change amount is not greater than the RSRP threshold, confirm that the TA corresponding to the judgment time point is valid, and the judgment time point is a time point for judging whether to initiate the CG-SDT;

Wherein, the third RSRP measurement result is the RSRP measurement result when the third timing advance command is received, and the third timing advance command is the latest timing advance command received; the fourth RSRP measurement result is the Determine the RSRP measurement result corresponding to the time point.
The method according to claim 6 or 9, wherein the RSRP threshold comprises:

A first sub-RSRP threshold, where the first sub-RSRP threshold is a threshold corresponding to an increase in the RSRP variation;

A second sub-RSRP threshold, where the second sub-RSRP threshold is a threshold corresponding to a decrease in the RSRP variation.
A method for determining the validity of a timing advance TA, characterized in that the method comprises:

sending a first feedback message to the terminal device;

Wherein, the first feedback message is used for the terminal device to determine to start the first timer after initiating the small data transmission CG-SDT based on pre-configured resources, and the first timer is used to maintain all The effectiveness of the TA.
The method according to claim 11, characterized in that,

The first feedback message includes: first indication information, where the first indication information is used to indicate to start the first timer;

Wherein, the terminal device confirms that the TA is valid in the subsequent transmission phase during the operation of the first timer.
The method according to claim 11, characterized in that,

The first feedback message includes: a first timing advance command, where the first timing advance command is used to indicate a timing advance measurement value N TA ;

Wherein, during the operation of the first timer, the terminal device confirms that the adjusted TA is valid in the subsequent transmission phase, and the adjusted TA is a TA adjusted based on the N TA value.
The method according to any one of claims 11 to 13, characterized in that,

The first timer includes: a timer introduced for the CG-SDT;

or,

The first timer includes: a timer introduced for a terminal device in a connected state.
The method according to any one of claims 11 to 14, characterized in that,

When the terminal device initiates the CG-SDT, it confirms the validity of the TA through the second RSRP variation.
The method according to claim 15, characterized in that,

The terminal device obtains the second RSRP variation based on the third RSRP measurement result and the fourth RSRP measurement result;

When the second RSRP change amount is not greater than the RSRP threshold, the terminal device confirms that the TA corresponding to the judgment time point is valid, and the judgment time point is a time point for judging whether to initiate the CG-SDT;

Wherein, the third RSRP measurement result is the RSRP measurement result when the third timing advance command is received, and the third timing advance command is the latest timing advance command received; the fourth RSRP measurement result is the Determine the RSRP measurement result corresponding to the time point.
The method according to claim 16, wherein the RSRP threshold comprises:

A first sub-RSRP threshold, where the first sub-RSRP threshold is a threshold corresponding to an increase in the RSRP variation;

A second sub-RSRP threshold, where the second sub-RSRP threshold is a threshold corresponding to a decrease in the RSRP variation.
A device for determining the validity of a timing advance TA, characterized in that the device comprises: a validity maintenance module;

The validity determination module is configured to start a first timer after initiating small data transmission CG-SDT based on pre-configured resources, and use the first timer to maintain the validity of the TA in the subsequent transmission phase;

or,

The validity maintenance module is configured to maintain the validity of the TA in the subsequent transmission phase based on the RSRP variation of the first reference signal received power after the CG-SDT is initiated.
The device according to claim 18, wherein the validity maintenance module comprises: a timer starting unit;

The timer starting unit is configured to receive a first feedback message sent by a network device; and determine to start the first timer based on the first feedback message.
The device according to claim 19, wherein the first feedback message includes: first indication information, the first indication information is used to indicate to start the first timer; the validity maintenance module includes: : validity determination unit;

The validity determination unit is configured to confirm that the TA is valid in the subsequent transmission phase during the operation of the first timer.
The device according to claim 19, wherein the first feedback message comprises: a first timing advance command, the first timing advance command is used to indicate a timing advance measurement value N TA ; the validity maintenance The modules include: validity determination unit;

The validity determination unit is configured to confirm that the adjusted TA is valid in the subsequent transmission phase during the operation of the first timer, and the adjusted TA is based on the N TA Adjusted TA value.
Apparatus according to any one of claims 18 to 21, wherein,

The first timer includes: a timer introduced for the CG-SDT;

or,

The first timer includes: a timer introduced for a terminal device in a connected state.
The device according to claim 18, wherein the validity maintenance module comprises: a variation determination unit and a validity determination unit;

The variation determination unit is configured to obtain the first RSRP variation based on the first RSRP measurement result and the second RSRP measurement result;

The validity determination unit is configured to confirm that the TA corresponding to the resource transmission opportunity is valid when the first RSRP change amount is not greater than the RSRP threshold, and the resource transmission opportunity is in the subsequent transmission stage, using at the timing of data transmission;

Wherein, the first RSRP measurement result is the RSRP measurement result when the second timing advance command is received, and the second timing advance command is the latest received timing advance command; the second RSRP measurement result is the The RSRP measurement result before the resource transmission opportunity arrives.
The device according to claim 23, wherein the resource transmission opportunity comprises:

Pre-configure CG timing;

or,

Dynamic scheduling of DG timing;

or,

Physical uplink control channel PUCCH transmission timing.
The device according to any one of claims 18 to 24, wherein the device further comprises: a validity confirmation module;

The validity confirmation module is configured to confirm the validity of the TA through the second RSRP variation when initiating the CG-SDT.
The device according to claim 25, wherein the validity confirmation module comprises: a variation determination unit and a validity determination unit;

The variation determination unit is configured to obtain the second RSRP variation based on the third RSRP measurement result and the fourth RSRP measurement result;

The validity determining unit is configured to confirm that the TA corresponding to the judgment time point is valid when the second RSRP variation is not greater than the RSRP threshold, and the judgment time point is to judge whether to initiate the CG-SDT point in time;

Wherein, the third RSRP measurement result is the RSRP measurement result when the third timing advance command is received, and the third timing advance command is the latest timing advance command received; the fourth RSRP measurement result is the Determine the RSRP measurement result corresponding to the time point.
The device according to claim 23 or 26, wherein the RSRP threshold comprises:

A first sub-RSRP threshold, where the first sub-RSRP threshold is a threshold corresponding to an increase in the RSRP variation;

A second sub-RSRP threshold, where the second sub-RSRP threshold is a threshold corresponding to a decrease in the RSRP variation.
A device for determining the validity of a timing advance TA, characterized in that the device includes: a message sending module;

The message sending module is configured to send a first feedback message to the terminal device;

Wherein, the first feedback message is used for the terminal device to determine to start the first timer after initiating the small data transmission CG-SDT based on pre-configured resources, and the first timer is used to maintain all The effectiveness of the TA.
The apparatus according to claim 28, characterized in that,

The first feedback message includes: first indication information, where the first indication information is used to indicate to start the first timer;

Wherein, the terminal device confirms that the TA is valid in the subsequent transmission phase during the operation of the first timer.
The apparatus according to claim 28, characterized in that,

The first feedback message includes: a first timing advance command, where the first timing advance command is used to indicate a timing advance measurement value N TA ;

Wherein, during the operation of the first timer, the terminal device confirms that the adjusted TA is valid in the subsequent transmission phase, and the adjusted TA is a TA adjusted based on the N TA value.
Apparatus according to any one of claims 28 to 30, wherein

The first timer includes: a timer introduced for the CG-SDT;

or,

The first timer includes: a timer introduced for a terminal device in a connected state.
Apparatus according to any one of claims 28 to 31 wherein,

When the terminal device initiates the CG-SDT, it confirms the validity of the TA through the second RSRP variation.
The device according to claim 32, characterized in that,

The terminal device obtains the second RSRP variation based on the third RSRP measurement result and the fourth RSRP measurement result;

When the second RSRP change amount is not greater than the RSRP threshold, the terminal device confirms that the TA corresponding to the judgment time point is valid, and the judgment time point is a time point for judging whether to initiate the CG-SDT;

Wherein, the third RSRP measurement result is the RSRP measurement result when the third timing advance command is received, and the third timing advance command is the latest timing advance command received; the fourth RSRP measurement result is the Determine the RSRP measurement result corresponding to the time point.
The device according to claim 33, wherein the RSRP threshold comprises:

A first sub-RSRP threshold, where the first sub-RSRP threshold is a threshold corresponding to an increase in the RSRP variation;

A second sub-RSRP threshold, where the second sub-RSRP threshold is a threshold corresponding to a decrease in the RSRP variation.
A terminal device, characterized in that the terminal device includes: a processor; wherein,

The processor is configured to start a first timer after initiating the small data transmission CG-SDT based on pre-configured resources, and use the first timer to maintain the validity of the timing advance TA in the subsequent transmission phase;

or,

The processor is configured to, after initiating the CG-SDT, maintain the validity of the TA in the subsequent transmission phase based on a first reference signal received power RSRP variation.
A network device, characterized in that the network device includes: a transceiver; wherein,

The transceiver is configured to send a first feedback message to the terminal device;

Wherein, the first feedback message is used for the terminal device to determine to start the first timer after initiating the small data transmission CG-SDT based on pre-configured resources, and the first timer is used to maintain the timing of the subsequent transmission phase Advance the validity of TA.
A computer-readable storage medium, characterized in that executable instructions are stored in the readable storage medium, and the executable instructions are loaded and executed by a processor to realize the timing as described in any one of claims 1 to 17 The method of determination of the validity in advance.
A kind of chip, it is characterized in that, described chip comprises programmable logic circuit and/or program instruction, when described chip runs, is used for realizing the determination of the validity of timing advance as described in any one of claims 1 to 17 method.
A computer program product or computer program, characterized in that the computer program product or computer program includes computer instructions, the computer instructions are stored in a computer-readable storage medium, and the processor reads the computer-readable storage medium from the computer-readable storage medium And executing the computer instructions to realize the method for determining the effectiveness of timing advance as claimed in any one of claims 1 to 17.