Guard period configuration for LTE HD-FDD

1. A method, performed in a wireless device, of configuring a guard period in Half Duplex Frequency Division Duplex (HD-FDD) operation, the method comprising:

obtaining a timing advance between the wireless device and an access point; and

configuring a guard period in the wireless device based on the obtained timing advance and a radio access capability of the wireless device,

wherein the guard period specifies the time duration in unit of subframes, or a fractional amount of a subframe, that it is acceptable for the wireless device to either skip receiving at transition from DL-to-UL or skip transmitting at transition from UL-to-DL.

2. The method of claim 1 , wherein the obtaining the timing advance, comprises:

receiving the timing advance from the access point.

3. A method, performed in a wireless device, of configuring a guard period in Half Duplex Frequency Division Duplex (HD-FDD) operation, the method comprising:

obtaining a timing advance between the wireless device and an access point; and

configuring the guard period in the wireless device based on the obtained timing advance and a radio access capability of the wireless device,

wherein the guard period is configured using a default timing advance of 1 or 2subframes.

4. The method of claim 1 , wherein the method further comprises:

detecting an event triggering the configuration of guard period.

5. The method of claim 4 , wherein the event triggering the configuration of guard period comprises a change in the timing advance that is larger than a predetermined value.

6. The method of claim 1 , wherein the method further comprises:

obtaining the radio access capability of the wireless device.

7. The method of claim 1 , wherein the radio access capability is associated with a UE category.

8. The method of claim 1 , further comprising:

sending the radio access capability of the wireless device to the access point.

9. The method of claim 7 , wherein the radio access capability is sent during a random access procedure.

10. The method of claim 1 , wherein the access point is an eNodeB.

11. A computer program product comprising a non-transitory computer readable medium storing computer program code which, when executed in the wireless device, causes the wireless device to execute the method according to claim 1 .

12. A wireless device, adapted for configuring a guard period in Half Duplex Frequency Division Duplex (HD-FDD) operation, the wireless device comprising:

a radio communication interface;

processing circuitry configured to cause the wireless device to perform operations comprising:

obtaining a timing advance between the wireless device and an access point;

configuring the guard period in the wireless device based on the obtained timing advance and a radio access capability of the wireless device,

wherein the guard period specifies the time duration in unit of subframes, or a fractional amount of a subframe, that it is acceptable for the wireless device to either skip receiving at transition from DL-to-UL or skip transmitting at transition from UL-to-DL.

13. The wireless device of claim 12 , wherein the guard period is derived using a default timing advance.

14. The wireless device of claim 12 , wherein the obtaining the timing advance, comprises:

receiving the timing advance from the access point.

15. The wireless device of claim 12 , wherein the wireless device reports the radio access capability to the access point.