Automatically select guard interval value

1. A device comprising:

a processor;

a memory storing instructions executed by the processor to perform the steps of:

detect a distance between a first location of the device and a second location of a peer device;

automatically select one value for Guard Interval (GI) from at least two available values based on the detected distance;

update the value of GI using the selected value;

wherein the distance between the device and a peer device is detected by measuring a transmission time of a packet transmitted between the device and the peer device;

wherein the selected value for GI is no less than a transmission time associated with the distance multiplied by a ratio, the ratio comprising (1) a difference between a longest path representative of a reflection transmission path and a shortest path representative of a direction transmission path, and (2) the shortest path.

2. The device of claim 1 , wherein the selected value for GI is not less than a difference between the measured transmission time and a pre-determined longest transmission time.

3. The device of claim 1 , wherein the at least two available values include 0.8 μs, 1.6 μs and 3.2 μs when the device is compliant with the IEEE 802.11ax standard, and 0.4 μs and 0.8 μs when the device is compliant with the IEEE 802.11n standard.

4. The device of claim 1 , wherein the instructions, when executed cause the processor to further:

notify the peer device to update the value of GI using the selected value.

5. The device of claim 1 , wherein the device comprises an access point (AP), and the peer device comprises a mobile device or another AP.

6. A method comprising:

detecting, by a processor of an access point (AP), a distance between a first location of the AP and a second location of a peer device;

automatically selecting, by the processor, one value for Guard Interval (GI) from at least two available values based on the detected distance;

updating, by the processor, the value of GI using the selected value;

wherein the distance between the AP and a peer device is detected by measuring a transmission time of a packet transmitted between the AP and the peer device;

wherein the selected value for GI is no less than a transmission time associated with the distance multiplied by a ratio, the ratio comprising (1) a difference between a longest path representative of a reflection transmission path and a shortest path representative of a direction transmission path, and (2) the shortest path.

7. The method of claim 6 , wherein the selected value for GI is not less than a difference between the measured transmission time and a pre-determined longest transmission time.

8. The method of claim 6 , wherein the at least two available values include 0.8 μs, 1.6 μs and 3.2 μs when the AP is compliant with the IEEE 802.11ax standard, and the at least two available values include 0.4 μs and 0.8 μs when the AP is compliant with the IEEE 802.11n standard.

9. The method of claim 6 , further comprising:

notifying, by the processor, the peer device to update the value of GI using the selected value.

10. A non-transitory computer readable storage medium storing instructions that, when executed by a processor of an access point (AP), causes the processor to:

measure a transmission time of a packet transmitted between the AP and the peer device to detect a distance between a first location of the AP and a second location of a peer device;

automatically select one value for Guard Interval (GI) from at least two available values based on the detected distance; and

update the value of GI using the selected value, wherein the selected value for GI is no less than a transmission time associated with the distance multiplied by a ratio, the ratio comprising (1) a difference between a longest path representative of a reflection transmission path and a shortest path representative of a direction transmission path, and (2) the shortest path.

11. The non-transitory computer readable storage medium of claim 10 , further storing instructions that, when executed by the processor, causes the processor to:

notify a peer device to update the guard interval using the selected value.

12. The non-transitory computer readable storage medium of claim 11 , wherein the selected value for GI is not less than a difference between the measured transmission time and a pre-determined longest transmission time.

13. The non-transitory computer readable storage medium of claim 10 , wherein the at least two available values include 0.8 μs, 1.6 μs and 3.2 μs when the device is compliant with the IEEE 802.11ax standard, and 0.4 μs and 0.8 μs when the device is compliant with the IEEE 802.11n standard.