Guard period configuration for LTE HD-FDD
The present disclosure relates to a method, a device and a computer program for configuring a guard period in Half Duplex Frequency Division Duplex, HD-FDD, operation. According to some aspects, the disclosure relates to a method, performed in a wireless device, of configuring a guard period in HD-FDD operation. The method comprises obtaining a timing advance between the wireless device and an access point; and determining a guard period in the wireless device based on the obtained timing advance and a radio access capability of the wireless device. The disclosure also relates to a wireless device and to a computer program for executing the methods.
1. A method, performed in a user equipment, the method comprising:
configuring a guard period in Half Duplex Frequency Division Duplex (HD-FDD) operation;
detecting a timing advance between the user equipment and an access point has changed by a value that is larger than a predetermined non-zero value; and
responsive to detecting the timing advance has changed by a value that is larger than the predetermined non-zero value, determining the guard period in the user equipment based on an amount of the detected change in the timing advance and a radio access capability of the user equipment.
2. The method of claim 1 , wherein the guard period is configured using a default timing advance.
3. The method of claim 2 , wherein the guard period configured using the default timing advance is 1 or 2 subframes.
4. The method of claim 1 , wherein the guard period specifies a time duration in unit of subframes, or a fractional amount of a subframe, that it is acceptable for the user equipment to skip receiving at transition from downlink (DL)-to-uplink (UL) transmissions.
5. The method of claim 1 , wherein the guard period specifies a time duration in unit of subframes, or a fractional amount of a subframe, that it is acceptable for the user equipment skip transmitting at transition from uplink (UL)-to-downlink (DL) transmissions.
6. The method of claim 1 , wherein the method further comprises:
obtaining the radio access capability of the user equipment.
7. The method of claim 1 , wherein the radio access capability is associated with a user equipment (UE) category.
8. The method of claim 7 , wherein the radio access capability is sent during a random access procedure.
9. The method of claim 1 , further comprising:
sending the radio access capability of the user equipment to the access point.
10. The user equipment of claim 1 , wherein the radio access capability of the user equipment depends on a number of oscillators of a transceiver in the user equipment.
11. The user equipment of claim 10 , wherein the radio access capability of the user equipment identifies the transceiver of the user equipment comprises a single oscillator.
12. The method of claim 1 , wherein the radio access capability of the user equipment comprises a radio switching time of a transceiver of the user equipment.
13. The method of claim 12 , wherein the radio switching time of the transceiver of the user equipment comprises a time for the transceiver to switch from ON-to-OFF and a time for the transceiver to switch from OFF-to-ON.
14. The method of claim 12 , wherein determining the guard period in the user equipment based on the obtained timing advance and a radio access capability of the user equipment comprises:
selecting the guard period from a set of predefined guard period configurations based on the obtained timing advance and the radio access capability of the user equipment.
15. A computer program product comprising a non-transitory computer readable medium storing computer program code which, when executed by a processor comprised of a user equipment, causes the processor of the user equipment wireless device to perform operations comprising:
configuring a guard period in Half Duplex Frequency Division Duplex (HD-FDD) operation;
detecting a timing advance between the user equipment and an access point has changed by a value that is larger than a predetermined non-zero value; and
responsive to detecting the timing advance has changed by a value that is larger than the predetermined non-zero value, determining the guard period in the user equipment based on an amount of the detected change in the timing advance and a radio access capability of the user equipment.
16. A user equipment comprising:
a radio communication interface;
processing circuitry configured to cause the user equipment to perform operations comprising:
configuring a guard period in Half Duplex Frequency Division Duplex (HD-FDD) operation;
detecting a timing advance between the user equipment and an access point has changed by a value that is larger than a predetermined non-zero value; and
responsive to detecting the timing advance has changed by a value that is larger than the predetermined non-zero value, determining the guard period in the user equipment based on an amount of the detected change in the timing advance and a radio access capability of the user equipment.
17. The user equipment of claim 16 , wherein the guard period is derived using a default timing advance.
18. The user equipment of claim 16 , wherein the user equipment reports the radio access capability to the access point.