Methods and non-transitory computer readable media for wireless communication

Abstract

This application relates to data transfer in an inactive state. This application relates to small data transfer (SDT). In an example, SDT can be used to transfer information between a UE and a network, where a NAS layer of the UE is in a 5GMM-CONNECTED mode with an RRC inactive indication, and an AS layer of the UE is in an RRC_INACTIVE state. To this end, the UE can be preconfigured to classify information as conforming to SDT. Further, resources can be preconfigured for the SDT. For example, the UE can maintain a set of radio bearers in a suspended state. One or more of the preconfigured resources can be used to transfer information between the UE and the network while the NAS layer is in the 5GMM-CONNECTED mode with the inactive indication and the AS layer is in the RRC_INACTIVE state.

Claims

1. A method implemented by a user equipment (UE), the method comprising: When the UE’s Non-Access Stratum (NAS) layer operates in 5GMM-CONNECTED mode with Radio Resource Control (RRC) inactivity indication and the UE’s Access Stratum (AS) layer operates in RRC_INACTIVE state, the network paging message is processed, indicating that downlink data transmission is available and one or more radio bearers configured for Small Data Transmission (SDT) are to be used. When the NAS layer operates in the 5GMM-CONNECTED mode with the RRC inactivity indication and the AS layer operates in the RRC_INACTIVE state, the reception of the downlink data is initiated based on the paging message and configuration, wherein the configuration is defined in association with the 5GMM-CONNECTED mode with the RRC inactivity indication and the RRC_INACTIVE state, and indicates the one or more radio bearers to be used for the reception; After receiving the downlink data, it is determined that the NAS layer continues to operate in the 5GMM-CONNECTED mode with the RRC inactivity indication and the AS layer continues to operate in the RRC_INACTIVE state; and After receiving the downlink data, the NAS layer continues to operate in the 5GMM-CONNECTED mode with the RRC inactivity indication, and the AS layer continues to operate in the RRC_INACTIVE state.

2. The method according to claim 1, further comprising: When the NAS layer operates in the 5GMM-CONNECTED mode, and before the NAS layer transitions to the 5GMM-CONNECTED mode with the RRC inactivity indication and before the AS layer transitions to the RRC_INACTIVE state, it processes the configuration from the network. The configuration is indicated from the AS layer to the NAS layer.

3. The method of claim 1, wherein the configuration indicates at least one of the following: information size, information priority, or the number of radio bearers to which the configuration is applied.

4. The method according to claim 1, further comprising: This keeps the signaling radio bearer zero (SRB0) active. This causes the signaling radio bearers, except for SRB0, to be put into a suspended state; as well as This causes the Data Radio Bearer (DRB) to switch to the suspended state.

5. The method according to claim 1, further comprising: Determine the first trigger to transmit uplink data; Determine that the uplink data has a classification associated with the configuration; as well as When in the RRC_INACTIVE state, the uplink data is transmitted on the Data Radio Bearer (DRB).

6. The method according to claim 1, further comprising: It was determined that the Data Radio Bearer (DRB) cannot be used to transmit uplink data; The process of initiating a service request; Transition to the RRC_CONNECTED state; The service acceptance message is processed based on the service request process, wherein the service acceptance message indicates that the RRC_INACTIVE state will be maintained. as well as Maintain the 5GMM-CONNECTED mode with the RRC inactivity indication.

7. The method according to claim 1, further comprising: Determine the trigger to transmit Non-Access Stratum (NAS) signaling information; Determine that the NAS signaling information has a classification associated with the configuration; as well as When in the RRC_INACTIVE state, the NAS signaling information is transmitted on the signaling radio bearer (SRB).

8. The method according to claim 1, further comprising: Transitioning the Data Radio Bearer (DRB) from a suspended state to a resumed state. The downlink data is received on the DRB.

9. A non-transitory computer-readable medium storing instructions that, when executed, cause a user equipment (UE) to perform an operation, the operation comprising: When the Non-Access Stratum (NAS) layer is in 5GMM-CONNECTED mode with Radio Resource Control (RRC) inactivity indication and the User Equipment (UE) Access Stratum (AS) layer is in RRC_INACTIVE state, the paging message of the network is processed, indicating that downlink data transmission is available and one or more radio bearers configured for Small Data Transmission (SDT) are to be used. When the NAS layer is in the 5GMM-CONNECTED mode with the RRC inactivity indication and the AS layer is in the RRC_INACTIVE state, the reception of downlink data is initiated based on the paging message and configuration, wherein the configuration is defined in association with the 5GMM-CONNECTED mode with the RRC inactivity indication and the RRC_INACTIVE state, and indicates the one or more radio bearers to be used for the reception; After receiving the downlink data, it is determined that the NAS layer will remain in the 5GMM-CONNECTED mode with the RRC inactivity indication and the AS layer will remain in the RRC_INACTIVE state; and After receiving the downlink data, the NAS layer is maintained in the 5GMM-CONNECTED mode with the RRC inactivity indication and the AS layer is maintained in the RRC_INACTIVE state.

10. The non-transitory computer-readable medium of claim 9, wherein the operation further comprises: It is determined that uplink data will be transmitted to the network, wherein the uplink data has different classifications that are not associated with the configuration; It is determined that the Data Radio Bearer (DRB) is available for the transmission of the uplink data, wherein the DRB is in a suspended state; Transform the DRB into a recovery state; as well as The uplink data is transmitted on the DRB when the NAS layer is in the 5GMM-CONNECTED mode with the RRC inactivity indication and the AS layer is in the RRC_INACTIVE state.

11. The non-transitory computer-readable medium of claim 9, wherein the operation further comprises: It is determined that uplink data will be transmitted to the network, wherein the uplink data has different classifications that are not associated with the configuration; It was determined that the Data Radio Bearer (DRB) could not be used for the transmission of the uplink data; Transition the AS layer to the RRC_CONNECTED state; as well as The uplink data is transmitted when the NAS layer is in the 5GMM-CONNECTED mode and the AS layer is in the RRC_CONNECTED state.

12. The non-transitory computer-readable medium of claim 9, wherein the operation further comprises: It is determined that uplink data will be transmitted to the network, wherein the uplink data has different classifications that are not associated with the configuration; as well as The uplink data is transmitted to the network based on the Unified Access Control (UAC) parameters when the NAS layer is in the 5GMM-CONNECTED mode with the RRC inactivity indication and the AS layer is in the RRC_INACTIVE state.

13. The non-transitory computer-readable medium of claim 9, wherein the operation further comprises: It is determined that uplink data will be transmitted to the network, wherein the uplink data has different classifications that are not associated with the configuration; The uplink data transmission is caused by the UE's AS layer when the NAS layer is in the 5GMM-CONNECTED mode with the RRC inactivity indication and the AS layer is in the RRC_INACTIVE state; The failure of the transmission is determined by the AS layer; as well as The uplink data is retransmitted due to the AS layer.

14. The non-transitory computer-readable medium of claim 9, wherein the operation further comprises: It is determined that uplink data will be transmitted to the network, wherein the uplink data has different classifications that are not associated with the configuration; It was determined that the Data Radio Bearer (DRB) could not be used for the transmission of the uplink data; Transition the AS layer to the RRC_CONNECTED state; as well as The uplink data is transmitted when the NAS layer is in the 5GMM-CONNECTED mode and the AS layer is in the RRC_CONNECTED state.

15. The non-transitory computer-readable medium of claim 9, wherein the operation further comprises: The AS layer of the UE receives an RRC release message indicating the termination of information transmission based on the configuration; as well as The AS layer indicates the termination to the NAS layer of the UE and the AS layer indicates the transition to the RRC_CONNECTED state.

16. A method implemented via a network, the method comprising: When the User Equipment (UE) is in 5GMM-CONNECTED mode, an indication is generated for transmission to the UE to transition the UE's Access Layer (AS) to Radio Resource Control (RRC)_INACTIVE state. Generate a configuration for transmission to the UE for the NAS layer in the 5GMM-CONNECTED mode with RRC inactivity indication and the AS layer in the RRC_INACTIVE state, the configuration indicating the radio bearer to be used for small data transmission (SDT); Generate a paging message for transmission to the UE, the paging message indicating that downlink data transmission is available and that one or more of the radio bearers are to be used; and When the NAS layer is in the 5GMM-CONNECTED mode with the RRC inactivity indication and the AS layer is in the RRC_INACTIVE state, the downlink data for transmission to the UE is generated based on the configuration.

17. The method of claim 16, wherein the configuration indicates at least one of the following: information size, information priority, or the number of radio bearers to which the configuration applies, wherein the radio bearers include at least one of data radio bearers (DRBs) or signaling radio bearers (SRBs).

18. The method of claim 16, further comprising: Process the service request of the UE, the service request being associated with the AS layer transitioning to the RRC_CONNECTED state; as well as Based on the service request, an indication is generated for transmission to the UE to keep the AS layer in the RRC_INACTIVE state.

19. The method according to claim 16, further comprising: Generate a paging message for transmission to the UE, indicating that the downlink data has a category associated with the configuration, wherein the downlink data is transmitted to the UE based on the paging message.

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