CN-122002577-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 sends a first signaling or receives a second signaling in a first state, wherein the first signaling is used for triggering the scheduling of uplink data transmission to the terminal device, the second signaling is used for scheduling downlink data transmission to the terminal device, and the context information stored in the first state by the terminal device comprises part of context information in the context information stored in an RRC connection state by the terminal device, 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: in a first state, a first signaling is sent or a second signaling is received, wherein the first signaling is used for triggering the scheduling of uplink data transmission to the terminal equipment, and the second signaling is used for scheduling downlink data transmission to the terminal equipment; wherein, in the first state, the context information stored by the terminal device in the first state includes part of the context information in the context information stored by the terminal device in the RRC connected state, and the part of the context information includes 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 according to any of claims 1-2, wherein before or after sending the first signaling, or after receiving the second signaling, or after receiving the third signaling, further comprising: Obtaining fifth context information; the third signaling is triggered based on the first signaling, and is used for scheduling uplink data transmission to the terminal equipment; the fifth context information includes one or more of: The data transmission related air interface context information comprises a data packet sequence number and/or a data transmission related variable, wherein the data transmission related variable is used for determining a time window of data transmission; Periodic reference signal configuration information and/or measurement reporting configuration information; A security key.
4. 4. The method of claim 3, wherein the obtaining fifth context information comprises: deducing to obtain a security key in the fifth context information according to the security configuration information in the context configuration information stored by the terminal equipment in the first state, or According to the information sent by the network equipment, obtaining the periodic reference signal configuration information and/or measurement report configuration information in the fifth context information, or Restoring the suspended fifth context information.
5. 5. The method of any one of claims 3-4, further comprising: The fifth context information is deleted or suspended when the first condition is satisfied.
6. 6. The method of claim 5, wherein deleting or suspending the fifth context information when the first condition is satisfied comprises: Deleting or suspending the fifth context information after the completion of the uplink data transmission or the downlink data transmission, or Deleting or suspending the fifth context information when a first timer expires, wherein the first timer is started after receiving the third signaling or is started after receiving the second signaling, or The fifth context information is deleted or suspended after receiving the fourth signaling.
7. 7. The method according to any of claims 1-6, wherein the second signaling is further used to instruct the terminal device to measure a reference signal sent with a channel or to indicate that there is a channel reference signal sent.
8. 8. The method according to any of claims 1-7, wherein the terminal device after receiving the second signaling in the first state, further comprises: Receiving downlink data; And sending a first sequence of a first signal, wherein the first sequence is used for indicating the terminal equipment to successfully receive the downlink data.
9. 9. The method according to any of claims 1-8, wherein the terminal device, after receiving the second signaling in the first state, further comprises: and sending a second sequence of the first signal, wherein the second sequence is used for indicating that the terminal equipment fails to receive downlink data.
10. 10. The method of claim 8 or 9, wherein the first signal is a preamble or a sounding reference signal.
11. 11. A method of communication, for use with a network device, comprising: Receiving a first signaling or sending a second signaling, wherein the first signaling is used for triggering the scheduling of uplink data transmission to the terminal equipment in a first state, and the second signaling is used for scheduling downlink data transmission to the terminal equipment in the first state; The context information stored by the terminal equipment in the first state comprises part of context information in the context information stored by the terminal equipment in the RRC connection state, and the part of context information comprises security configuration information.
12. 12. The method of claim 11, 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.
13. 13. The method according to any of claims 11-12, wherein before or after sending the first signaling, or after receiving the second signaling, or after receiving the third signaling, further comprising: obtaining fifth context information of the terminal equipment; the third signaling is triggered based on the first signaling, and is used for scheduling uplink data transmission to the terminal equipment; the fifth context information includes one or more of: The data transmission related air interface context information comprises a data packet sequence number and/or a data transmission related variable, wherein the data transmission related variable is used for determining a time window of data transmission; Periodic reference signal configuration information and/or measurement reporting configuration information; A security key.
14. 14. The method of claim 13, wherein the obtaining fifth context information comprises: deducing to obtain a security key in the fifth context information according to the security configuration information in the context configuration information stored by the terminal equipment in the first state, or Restoring the suspended fifth context information.
15. 15. The method of any one of claims 13-14, further comprising: the fifth context information is deleted or suspended when the second condition is satisfied.
16. 16. The method of claim 15, wherein the deleting or suspending the fifth context information when the second condition is satisfied comprises: Deleting or suspending the fifth context information after the completion of the uplink data transmission or the downlink data transmission, or Deleting or suspending the fifth context information when a second timer times out, wherein the second timer is started when the third signaling is sent or is started when the second signaling is sent, or And deleting or suspending the fifth context information when or after transmitting fourth signaling, wherein the fourth signaling is used for indicating the terminal equipment to delete or suspend the fifth context information.
17. 17. The method according to any of claims 11-16, wherein the second signaling is further used to instruct the terminal device to measure a reference signal sent with a channel or to indicate that there is a channel reference signal sent.
18. 18. The method of any of claims 11-17, further comprising, after sending the second signaling: transmitting downlink data; And receiving a first sequence of a first signal, wherein the first sequence is used for indicating the terminal equipment to successfully receive the downlink data.
19. 19. The method of any of claims 11-18, further comprising, after sending the second signaling: transmitting downlink data; And receiving a second sequence of the first signal, wherein the second sequence is used for indicating the failure of the terminal equipment to receive the downlink data.
20. 20. The method of claim 18 or 19, wherein the first signal is a preamble or a sounding reference signal.

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