Apparatus, system and method of communicating during a discovery window

1. An apparatus comprising logic and circuitry configured to cause a wireless Neighbor Awareness Networking (NAN) station to:

select a particular access window from a plurality of access windows within a discovery window (DW) of a plurality of DWs according to a discovery scheme corresponding to a NAN cluster comprising the wireless NAN station, the discovery scheme comprising a DW interval between two consecutive DWs, the DW interval to include communication of a plurality of discovery beacons, the discovery window configured to communicate NAN messages in the NAN cluster according to a contention mechanism, the NAN messages comprising one or more synchronization beacons and one or more NAN service discovery frames (SDFs), the plurality of access windows comprises at least first and second access windows, which are for transmission of the NAN SDFs according to the contention mechanism, the particular access window selected from the at least first and second access windows; and

contend to transmit a NAN SDF during the particular access window.

2. The apparatus of claim 1 , wherein an entire duration of said discovery window includes said plurality of access windows.

3. The apparatus of claim 1 , wherein the discovery window includes a first period followed by a second period, the second period including said plurality of access windows.

4. The apparatus of claim 3 configured to cause the wireless NAN station to process the one or more synchronization beacons communicated during the first period of the discovery window, and to select the particular access window within the second period.

5. The apparatus of claim 3 , wherein a duration of said first period is 2 milliseconds or less.

6. The apparatus of claim 1 configured to cause the wireless NAN station to contend to transmit the NAN SDF during another access window within said discovery window, if transmission of said NAN SDF during the particular access window fails.

7. The apparatus of claim 1 configured to cause the wireless NAN station to randomly select the particular access window.

8. The apparatus of claim 1 configured to cause the wireless NAN station to select the particular access window based on an identifier of said wireless NAN station.

9. The apparatus of claim 8 , wherein the identifier of said wireless NAN station comprises a Media Access Control (MAC) address of said wireless NAN station.

10. The apparatus of claim 1 configured to cause the wireless NAN station to select the particular access window based on a service descriptor of a service to be identified by the NAN SDF.

11. The apparatus of claim 1 configured to cause the wireless NAN station to set said plurality of access windows according to a synchronization beacon message received from another wireless NAN station.

12. The apparatus of claim 11 , wherein said synchronization beacon message comprises a first access window start time, and an access window duration.

13. The apparatus of claim 1 configured to cause the wireless NAN station to contend to transmit the NAN SDF over a 2.4 Gigahertz (GHz) or 5GHz band.

14. The apparatus of claim 1 configured to cause the wireless NAN station to contend to transmit the NAN SDF over a sub 1 Gigahertz (S1G) band.

15. A system comprising a wireless Neighbor Awareness Networking (NAN) device, the wireless NAN device comprising:

one or more antennas;

a memory;

a processor;

a controller to select a particular access window from a plurality of access windows within a discovery window (DW) of a plurality of DWs according to a discovery scheme corresponding to a NAN cluster comprising the wireless NAN device, the discovery scheme comprising a DW interval between two consecutive DWs, the DW interval to include communication of a plurality of discovery beacons, the discovery window configured to communicate NAN messages in the NAN cluster according to a contention mechanism, the NAN messages comprising one or more synchronization beacons and one or more NAN service discovery frames (SDFs), the plurality of access windows comprises at least first and second access windows, which are for transmission of the NAN SDFs according to the contention mechanism, the particular access window selected from the at least first and second access windows; and

a radio to contend to transmit a NAN SDF during the particular access window.

16. The system of claim 15 , wherein the discovery window includes a first period followed by a second period, the second period including said plurality of access windows.

17. A method to be performed at a wireless Neighbor Awareness Networking (NAN) device, the method comprising:

selecting a particular access window from a plurality of access windows within a discovery window (DW) of a plurality of DWs according to a discovery scheme corresponding to a NAN cluster comprising the wireless NAN device, the discovery scheme comprising a DW interval between two consecutive DWs, the DW interval to include communication of a plurality of discovery beacons, the discovery window being configured to communicate NAN messages in the NAN cluster according to a contention mechanism, the NAN messages comprising one or more synchronization beacons and one or more NAN service discovery frames (SDFs), the plurality of access windows comprises at least first and second access windows, which are for transmission of the NAN SDFs according to the contention mechanism, the particular access window selected from the at least first and second access windows; and

contending to transmit a NAN SDF during the particular access window.

18. The method of claim 17 comprising contending to transmit the NAN SDF during another access window within said discovery window, if transmission of said NAN SDF during the particular access window fails.

19. The method of claim 17 comprising setting said plurality of access windows according to a synchronization beacon message received from another wireless NAN device.

20. A product including one or more tangible computer-readable non-transitory storage media comprising computer-executable instructions operable to, when executed by at least one processor, enable the at least one processor to cause a wireless Neighbor Awareness Networking (NAN) device to:

select a particular access window from a plurality of access windows within a discovery window (DW) of a plurality of DWs according to a discovery scheme corresponding to a NAN cluster comprising the wireless NAN device, the discovery scheme comprising a DW interval between two consecutive DWs, the DW interval to include communication of a plurality of discovery beacons, the discovery window configured to communicate NAN messages in the NAN cluster according to a contention mechanism, the NAN messages comprising one or more synchronization beacons and one or more NAN service discovery frames (SDFs), the plurality of access windows comprises at least first and second access windows, which are for transmission of the NAN SDFs according to the contention mechanism, the particular access window selected from the at least first and second access windows; and

contend to transmit a NAN SDF during the particular access window.

21. The product of claim 20 , wherein the discovery window includes a first period followed by a second period, the second period including said plurality of access windows.

22. The product of claim 20 , wherein said instructions, when executed, cause the wireless NAN device to contend to transmit the NAN SDF during another access window within said discovery window, if transmission of said the NAN SDF during the particular access window fails.

23. The product of claim 20 , wherein said instructions, when executed, cause the wireless NAN device to select the particular access window based on an identifier of said wireless NAN device.

24. The product of claim 20 , wherein said instructions, when executed, cause the wireless NAN device to set said plurality of access windows according to a synchronization beacon message received from another wireless NAN device.