Method and apparatus for absence time request
Embodiments of the present disclosure relate to methods and apparatuses for absence time request and user equipment (UE) behavior during the absence time. According to an embodiment of the present disclosure, a method performed by a UE for wireless communication includes: transmitting a request for an absence time to a base station (BS); receiving a response assigning the absence time from the BS; suspending a connection to the BS upon receiving the response; and resuming the connection to the BS before or at the end of the absence time.
1. A user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
transmit a request for an absence time to a base station (BS);
receive a response assigning the absence time from the BS, wherein the response comprises information indicating a duration corresponding to the absence time, and wherein the information comprises a beginning system frame number (SFN), a beginning sub-frame number, and a number of consecutive subframes within the duration;
suspend a connection to the BS based on receiving the response; and
resume the connection to the BS before or at an end of the absence time.
2. The UE of claim 1 , wherein the request comprises at least one of:
a paging cause included in a paging message from a second BS;
indication of whether the paging message is a radio access network (RAN) paging or a core network (CN) paging;
indication of whether a user plane function (UPF) or an access and mobility management function (AMF) triggers the RAN paging; or
a configuration from the second BS.
3. The UE of claim 2 , wherein the configuration from the second BS comprises at least one of:
a time-domain random access channel (RACH) resource for preamble transmission for a random access procedure;
a value of a random access response window; or
indication of whether a two-step random access procedure is allowed.
4. The UE of claim 1 , wherein the response comprises a configuration for a timer corresponding to the absence time.
5. The UE of claim 4 , wherein the at least one processor is further configured to cause the UE to:
in response to receiving the response, start the timer; and
resume the connection to the BS after the timer expires.
6. The UE of claim 4 , wherein the at least one processor is further configured to cause the UE to:
in response to receiving the response, start the timer; and
enter an idle mode after the timer expires.
7. The UE of claim 1 , wherein the information further comprises a beginning slot number and a number of consecutive slots within the duration.
8. A base station (BS) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the BS to:
receive a request for an absence time from a user equipment (UE);
transmit a response assigning the absence time to the UE, wherein the response comprises information indicating a duration corresponding to the absence time, and wherein the information comprises a beginning system frame number (SFN), a beginning sub-frame number, and a number of consecutive subframes within the duration;
suspend a connection to the UE; and
resume the connection to the UE before or at an end of the absence time.
9. The BS of claim 8 , wherein the request comprises at least one of:
a paging cause included in a paging message from the BS;
indication of whether the paging message is a radio access network (RAN) paging or a core network (CN) paging;
indication of whether a user plane function (UPF) or an access and mobility management function (AMF) triggers the RAN paging; or
a configuration from the BS.
10. The BS of claim 9 , wherein the configuration from the BS comprises at least one of:
a time-domain random access channel (RACH) resource for preamble transmission for a random access procedure;
a value of a random access response window; or
indication of whether a two-step random access procedure is allowed.
11. The BS of claim 8 , wherein the response comprises a configuration for a timer corresponding to the absence time.
12. The BS of claim 11 , wherein the at least one processor is further configured to cause the BS to:
resume data transmission with the UE after the timer expires.
13. The BS of claim 11 , wherein the at least one processor is further configured to cause the BS to:
page the UE to resume data transmission with the UE after the timer expires.
14. The BS of claim 8 , wherein the information further comprises a beginning slot number and a number of consecutive slots within the duration.
15. A method performed by a user equipment (UE), the method comprising:
transmitting a request for an absence time to a base station (BS);
receiving a response assigning the absence time from the BS, wherein the response comprises information indicating a duration corresponding to the absence time, and wherein the information comprises a beginning system frame number (SFN), a beginning sub-frame number, and a number of consecutive subframes within the duration;
suspending a connection to the BS based on receiving the response; and
resuming the connection to the BS before or at an end of the absence time.
16. The method of claim 15 , wherein the request comprises at least one of:
a paging cause included in a paging message from a second BS;
indication of whether the paging message is a radio access network (RAN) paging or a core network (CN) paging;
indication of whether a user plane function (UPF) or an access and mobility management function (AMF) triggers the RAN paging; or
a configuration from the second BS.
17. The method of claim 16 , wherein the configuration from the second BS comprises at least one of:
a time-domain random access channel (RACH) resource for preamble transmission for a random access procedure;
a value of a random access response window; or
indication of whether a two-step random access procedure is allowed.
18. A method performed by a base station (BS), the method comprising:
receiving a request for an absence time from a user equipment (UE);
transmitting a response assigning the absence time to the UE, wherein the response comprises information indicating a duration corresponding to the absence time, and wherein the information comprises a beginning system frame number (SFN), a beginning sub-frame number, and a number of consecutive subframes within the duration;
suspending a connection to the UE; and
resuming the connection to the UE before or at an end of the absence time.
19. The method of claim 18 , wherein the request comprises at least one of:
a paging cause included in a paging message from a base station (BS);
indication of whether the paging message is a radio access network (RAN) paging or a core network (CN) paging;
indication of whether a user plane function (UPF) or an access and mobility management function (AMF) triggers the RAN paging; or
a configuration from the BS.
20. The method of claim 19 , wherein the configuration from the BS comprises at least one of:
a time-domain random access channel (RACH) resource for preamble transmission for a random access procedure;
a value of a random access response window; or
indication of whether a two-step random access procedure is allowed.