System and method for uplink timing synchronization in conjunction with discontinuous reception
View Patent ↗A system and method are disclosed for providing uplink timing synchronization during DRX operation in a wireless communication system.
1. A method in a user equipment (UE), comprising:
receiving an instruction;
determining from the instruction whether to operate in a first operation mode or a second operation mode;
wherein when operating with discontinuous reception (DRX) in the first operation mode, the UE transmits a sounding reference signal (SRS) during DRX active time; and
wherein when operating with DRX in the second operation mode, the UE transmits a SRS irrespective of DRX active time; and
maintaining an SRS resource configuration for the user equipment when not in the DRX active time.
2. The method of claim 1 , wherein the determining comprises operating in the first operation mode when the received instruction includes an instruction to operate in the first operation mode.
3. The method of claim 2 , wherein the determining comprises operating in the second operation mode when the received instruction includes an instruction to operate in the second operation mode.
4. The method of claim 3 , wherein the UE operates in the second operation mode in the absence of an instruction to operate in the first operation mode.
5. The method of claim 2 , wherein the UE operates in the first operation mode in the absence of an instruction to operate in the second operation mode.
6. The method of claim 1 , wherein the received instruction is from a network.
7. The method of claim 1 , wherein the method is repeated continuously.
8. The method of claim 1 , wherein the method executes when there is a change in SRS period.
9. The method of claim 8 , wherein the SRS period changes as a function of mobility of the UE.
10. The method claim 1 , wherein the method executes when there is a change in DRX cycle.
11. The method of claim 10 , wherein the DRX cycle changes as a function of channel utilization.
12. The method of claim 1 , wherein when operating with discontinuous reception (DRX) in the first operation mode, the UE refrains from transmitting the sounding reference signal (SRS) when not during DRX active time.
13. A user equipment (UE) for a wireless telecommunications system, comprising:
a receiver, the receiver configured to receive an instruction;
a transmitter, the transmitter configured to transmit a sounding reference signal (SRS); and
a processor, the processor configured to perform operations comprising:
determining from the received instruction whether to operate in a first operation mode or a second operation mode;
wherein when operating with discontinuous reception (DRX) in the first operation mode, instructing the transmitter to transmit SRS during DRX active time; and
wherein when operating with DRX in the second operation mode, instructing the transmitter to transmit SRS irrespective of DRX active time; and
maintaining an SRS resource configuration for the user equipment when not in the DRX active time.
14. The UE of claim 13 , wherein the determining comprises operating in the first operation mode when the received instruction includes an instruction to operate in the first operation mode.
15. The UE of claim 13 , wherein the determining comprises operating in the second operation mode when the received instruction includes an instruction to operate in the second operation mode.
16. The UE of claim 13 , wherein the UE operates in the second operation mode in the absence of an instruction to operate in the first operation mode.
17. The UE of claim 13 , wherein the UE operates in the first operation mode in the absence of an instruction to operate in the second operation mode.
18. The UE of claim 13 , wherein the received instruction is from a network.
19. The UE of claim 13 , wherein the processor is configured to repeat the operations continuously.
20. The UE of claim 13 , wherein the processor is configured to perform the operations when there is a change in SRS period.
21. The UE of claim 20 , wherein the SRS period changes as a function of mobility of the UE.
22. The UE of claim 13 , wherein the processor is configured to perform the operations when there is a change in DRX cycle.
23. The UE of claim 22 , wherein the DRX cycle changes as a function of channel utilization.
24. The UE of claim 13 , wherein when operating with discontinuous reception (DRX) in the first operation mode, the UE refrains from transmitting the sounding reference signal (SRS) when not during DRX active time.
25. A non-transitory machine-readable medium with a set of instructions stored thereon, which when executed, cause a processor to perform operations comprising:
receiving an instruction; determining from the instruction whether to operate in a first operation mode or a second operation mode;
wherein when operating with discontinuous reception (DRX) in the first operation mode, transmitting a sounding reference signal (SRS) during DRX active time; and
wherein when operating with DRX in the second operation mode, transmitting a SRS irrespective of DRX active time; and
maintaining an SRS resource configuration for the user equipment when not in the DRX active time.
26. The medium of claim 25 , wherein the determining comprises operating in the first operation mode when the received instruction includes an instruction to operate in the first operation mode.
27. The medium of claim 25 , wherein the determining comprises operating in the second operation mode when the received instruction includes an instruction to operate in the second operation mode.
28. The medium of claim 25 , the operations further comprising operating in the second operation mode in the absence of an instruction to operate in the first operation mode.
29. The medium of claim 24 , the operations further comprising operating in the first operation mode in the absence of an instruction to operate in the second operation mode.
30. The medium of claim 25 , wherein the received instruction is from a network.
31. The medium of claim 25 , wherein the operation are repeated continuously.
32. The medium of claim 25 , wherein the operations are executed when there is a change in SRS period.
33. The medium of claim 32 , wherein the SRS period changes as a function of mobility.
34. The medium claim 25 , wherein the operations are executed when there is a change in DRX cycle.
35. The medium of claim 34 , wherein the DRX cycle changes as a function of channel utilization.
36. The medium of claim 25 , wherein when operating with discontinuous reception (DRX) in the first operation mode, the UE refrains from transmitting the sounding reference signal (SRS) when not during DRX active time.