CN-122002578-A - Communication method and device

Abstract

A communication method and device relate to the technical field of wireless communication. The method comprises the steps that a terminal device receives first indication information, the first indication information indicates the terminal device to change from a Radio Resource Control (RRC) connection state to a first state, the first state is entered according to the first indication information, the context information stored by the terminal device in the first state comprises part of context information in the context information stored by the terminal device in the RRC connection state, and the part of context information comprises security configuration information.

Inventors

• LI CHENWAN
• LI RUIJIE

Assignees

• 华为技术有限公司

Dates

Publication Date

20260508

Application Date

20241101

Claims (20)

1. 1. A communication method, applied to a terminal device, comprising: receiving first indication information, wherein the first indication information indicates the terminal equipment to change from a Radio Resource Control (RRC) connection state to a first state; And entering the first state according to the first indication information, wherein in the first state, the context information stored by the terminal equipment in the first state comprises part of the context information in the context information stored by the terminal equipment in the RRC connection state, and the part of the context information comprises security configuration information.
2. 2. The method of claim 1, wherein in the first state the terminal device stops measurement of periodic reference signals, or In the first state, the terminal device measures the periodic reference signal with a length longer than that of the periodic reference signal in the RRC connected state or the RRC inactive state, or In the first state, the terminal device measures the periodic reference signal, and the length of the measurement period is equal to the length of the measurement period for measuring the periodic reference signal when in the RRC connected state or the RRC inactive state.
3. 3. The method of any one of claims 1-2, wherein after receiving the first indication information, further comprising: and releasing or suspending one or more of the following items of the context information of the terminal equipment in the RRC connection state, namely, the air interface context information related to data transmission and periodically measuring configuration information.
4. 4. A method according to any one of claims 1-3, wherein prior to receiving the first indication information, further comprising: A first request is sent for requesting entry into the first state.
5. 5. The method of claim 4, wherein the sending the first request comprises: Determining to change from RRC connected state to said first state according to quality and/or service information of the serving cell, transmitting said first request, or Determining to change from the RRC connected state to the first state based on measurements of the downlink signal, transmitting the first request, or And determining to change from the RRC connection state to the first state according to the measurement of the downlink signal and the statistics of the transmitted data quantity, and sending the first request.
6. 6. The method according to any of claims 1-5, wherein the terminal device in the first state further comprises: receiving second indication information, wherein the second indication information is used for indicating the terminal equipment to change from the first state to an RRC connection state; And entering an RRC connection state according to the second indication information, and recovering the context information of the RRC connection state and recovering the measurement of the periodic reference signal by the terminal equipment under the RRC connection.
7. 7. The method according to any of claims 1-5, wherein the terminal device, when in the first state, further comprises: Receiving third indication information, wherein the third indication information is used for indicating the terminal equipment to change from the first state to an RRC inactive state; and entering an RRC inactive state according to the third indication information.
8. 8. The method of claim 7, wherein the terminal device, when in an RRC inactive state, further comprises: Receiving fourth indication information, wherein the fourth indication information is used for indicating the terminal equipment to change from an RRC inactive state to the first state; And entering the first state according to the fourth indication information.
9. 9. A method according to any of claims 1-8, characterized in that the first state comprises a first mode and/or a second mode, the terminal device transmitting data when in the first mode and the terminal device not transmitting data when in the second mode.
10. 10. The method of claim 9, wherein the terminal device when in the first mode further comprises transmitting data, receiving fifth indication information, changing from the first mode to the second mode according to the fifth indication information, wherein the fifth indication information is used for indicating that the terminal device changes from the first mode to the second mode or is used for indicating that data transmission is completed, or The terminal equipment further comprises a step of receiving sixth indication information when in the second mode, and a step of changing from the second mode to the first mode according to the sixth indication information.
11. 11. The method as recited in claim 9, further comprising: Starting a timer after receiving signaling for data transmission scheduling, wherein the terminal equipment is in the first mode during the running period of the timer; when the timer expires, the first mode is changed to the second mode.
12. 12. The method according to any of claims 1-11, wherein the terminal device, when in the first state, further comprises: switching or changing from a source cell to a target cell, wherein the source cell and the target cell belong to the same area; and sending an access request or an update instruction to the target cell, wherein the access request and the update instruction are used for triggering the target cell to send a UE change cell instruction to the source cell, and the UE change cell instruction is used for triggering the source cell to send the stored context information of the terminal equipment to the target cell.
13. 13. A method of communication, for use with a network device, comprising: In the first state, the terminal equipment stops measuring the periodic reference signal, and the context information stored by the terminal equipment in the first state comprises part of the context information in the context information stored by the terminal equipment in the RRC connection state, wherein the part of the context information comprises security configuration information; and releasing or suspending part of the context information in the context information of the terminal equipment in the RRC connection state, which is stored by the network equipment.
14. 14. The method of claim 13, wherein in the first state the terminal device stops measurement of periodic reference signals, or In the first state, the terminal device measures the periodic reference signal with a length longer than that of the periodic reference signal in the RRC connected state or the RRC inactive state, or In the first state, the terminal device measures the periodic reference signal, and the length of the measurement period is equal to the length of the measurement period for measuring the periodic reference signal when in the RRC connected state or the RRC inactive state.
15. 15. The method according to any of claims 13-14, wherein said releasing or suspending part of the context information of the terminal device in the RRC connected state, which is stored by the network device, comprises: And releasing or suspending one or more of the context information of the terminal equipment in the RRC connection state, which is stored by the network equipment, namely, air interface context information related to data transmission, and periodically measuring configuration information.
16. 16. The method according to any one of claims 13-15, wherein before the sending the first indication information, further comprising: Receiving a first request, wherein the first request is used for requesting to enter the first state; the sending the first indication information includes: And sending the first indication information according to the first request.
17. 17. The method according to any of claims 13-16, wherein the terminal device in the first state further comprises: transmitting second indication information, wherein the second indication information is used for indicating the terminal equipment to change from the first state to an RRC connection state; and restoring the context information of the terminal equipment in the RRC connection state, which is stored by the network equipment.
18. 18. The method according to any of claims 13-16, wherein the terminal device, when in the first state, further comprises: And sending third indication information, wherein the third indication information is used for indicating the terminal equipment to change from the first state to the RRC inactive state.
19. 19. The method of claim 18, wherein the terminal device, when in the RRC inactive state, further comprises: and sending fourth indication information, wherein the fourth indication information is used for indicating the terminal equipment to change from the RRC inactive state to the first state.
20. 20. A method according to any of claims 13-19, wherein the first state comprises a first mode and/or a second mode, wherein the terminal device performs data transmission when in the first mode, and wherein the terminal device does not perform data transmission when in the second mode.

Description

Communication method and device Technical Field The present application relates to the field of wireless communications technologies, and in particular, to a communication method and apparatus. Background In a long term evolution (long term evolution, LTE) system, the radio resource control (radio resource control, RRC) state of the terminal device includes an RRC connected state and an RRC idle state. In the RRC connected state, there is a signaling connection between the terminal device and the base station, and data transmission may be performed between the terminal device and the base station, or there may be no data transmission between the terminal device and the base station but only RRC signaling transmission. In the RRC idle state, no signaling connection exists between the terminal equipment and the base station, and no data transmission or RRC signaling transmission exists between the terminal equipment and the base station. When the terminal device is in the RRC idle state, the core network may page the terminal device in an area corresponding to the tracking area identifier (TRACKING AREA IDENTITY, TAI) list through one or more base stations in the area. When the terminal device moves out of the area corresponding to the TAI list, a core network registration procedure may be initiated, a non-access stratum (NAS) registration update (NAS Registration Update) is performed, and the core network registers the location of the terminal device and updates the terminal device registration area of the terminal device, that is, reassigns the TAI list including the tracking area (TRACKING AREA, TA) to which the cell where the terminal device is currently located to the terminal device. In the fifth generation (5th generation,5G) system, an RRC inactive state (RRC INACTIVE) is introduced on the basis of an RRC connected state and an RRC idle state. In the RRC connection state, the terminal equipment and the base station establish RRC connection, the terminal equipment and the base station store the context information of the terminal equipment, in the RRC idle state, the terminal equipment and the base station do not need to maintain the context information of the terminal equipment, and in the RRC inactive state, the terminal equipment pauses data processing, but the terminal equipment and the base station still maintain part of the context information of the terminal equipment, so that the terminal equipment can be quickly restored to the RRC connection state. The terminal device in the RRC inactive state can maintain a power consumption level similar to that in the RRC idle state because data processing is suspended. Meanwhile, the base station still maintains the context information of the terminal equipment in the RRC inactive state, so that the terminal equipment is still in a connection management connection (connection management connected, CM-connected) state, that is, the terminal equipment still has signaling connection with the access and mobility management function (ACCESS AND mobility management function, AMF), when data transmission needs to be carried out, the terminal equipment is required to be carried out from the RRC inactive state to the RRC connected state, and compared with the terminal equipment carried out from the RRC idle state to the RRC connected state, the processes of bearer establishment, authentication and the like are not required, so that the service of the terminal equipment can be recovered more rapidly. In the aspect of data transmission, in an RRC connection state, when data transmission is needed, the terminal equipment can immediately perform data transmission based on the RRC connection to realize rapid conversion from countless data transmission to the data transmission, in an RRC inactive state, for downlink data transmission, the terminal equipment needs to receive paging information at paging occasions and can receive data after accessing a network based on the paging information, for uplink data transmission, the terminal equipment needs to recover the RRC connection based on stored context information and can send the data, compared with the RRC connection state, the conversion time of the terminal equipment from countless data transmission is slower, in an RRC idle state, because the terminal equipment does not store the context information, compared with the RRC connection with a network side in the RRC inactive state, the conversion time of the terminal equipment from countless data transmission to the data transmission is slower. In the aspect of energy conservation, in the RRC connection state, the terminal equipment needs to perform channel measurement on a periodic reference signal, for example, channel state information reference signal (CHANNEL STATE information REFERENCE SIGNAL, CSI-RS) with a period of 20 milliseconds is measured, so that appropriate bandwidth resources are selected to perform data transmission with a network side, the power consu