Method and apparatus for transferring smart antenna capability information

1. A first station (STA) for exchanging antenna capability information in wireless communications, the first STA comprising:

a receiver configured to receive a probe request frame that contains an antenna capability information element that indicates a plurality of antenna capabilities of a second STA;

a processor configured to determine whether the first STA supports at least one of the indicated plurality of antenna capabilities; and

a transmitter configured to transmit a probe response frame that contains a second antenna capability information element that indicates a plurality of antenna capabilities of the first STA.

2. The first STA according to claim 1 , wherein the first STA is a wireless local area network (WLAN) access point.

3. The first STA according to claim 1 , wherein the first STA is a STA in a wireless local area network (WLAN).

4. The first STA according to claim 1 , wherein the first or the second antenna capability information element includes an antenna technology field.

5. The first STA according to claim 1 , wherein the first or the second antenna capability information element further includes at least one field selected from the group consisting of a number of supported beams, an indicator of support of transmit antenna information after physical layer convergence protocol header, an indicator of diversity technique, an indicator of antenna measurement signaling support, and an indicator of multiple input support.

6. The first STA according to claim 5 , wherein each of the at least one fields is derived by the second STA from the antenna technology field.

7. The first STA according to claim 1 , wherein the probe response frame is transmitted at any time after association between the first STA and the second STA.

8. The first STA according to claim 1 , wherein the probe response frame is transmitted at any time after a data transfer between the STA and the second STA.

9. The first STA of claim 1 , wherein the processor is further configured to adjust antenna settings of the first STA to use a set of antenna capabilities belonging to both the first and second STAs on a condition that the first STA supports at least one of the indicated plurality of antenna capabilities.

10. A method for exchanging antenna capability information at a first station (STA) in wireless communications, the method comprising:

receiving a probe request frame that contains an antenna capability information element that indicates a plurality of antenna capabilities of a second STA;

determining whether the first STA can support at least one of the indicated plurality of antenna capabilities of the second STA; and

transmitting a probe response frame that contains a second antenna capability information element that indicates a plurality of antenna capabilities of the first STA.

11. The method according to claim 10 , wherein the replying is performed prior to the adjusting.

12. The method according to claim 10 , wherein the replying is performed after the adjusting.

13. The method according to claim 10 , wherein the replying includes notifying the transmitting STA that the receiving STA does not have the requested antenna capabilities.

14. The method according to claim 10 , wherein the receiving includes receiving data from the transmitting STA using a different antenna capability than the plurality of indicated antenna capabilities.

15. The method according to claim 10 , wherein the adjusting includes adjusting at least one setting selected from the group consisting of a number of antennas used, a diversity method, a smart antenna technology used, and additional antenna measurements.

16. The method of claim 10 , further comprising: adjusting settings at the first STA to use a set of antenna capabilities belonging to both the first and second STAs on a condition that the first STA can support at least one of the indicated plurality of antenna capabilities of the second STA.

17. A method for exchanging smart antenna capability information at a first station (STA) in wireless communications, the method comprising:

transmitting a probe request frame containing antenna capability information relating to the antenna capability of the first STA, prior to data transmission with a second STA;

receiving a probe response frame containing antenna capability information relating to the antenna capability of the second STA; and

determining which antenna capabilities to use for future transmission and reception.

18. The method according to claim 16 , wherein the deciding is performed without any additional communication.

19. The method according to claim 16 , further comprising:

exchanging measurement information with the second STA, the exchanging being performed prior to the deciding.

20. The method according to claim 16 , further comprising:

negotiating antenna capability information with the second STA, the negotiating being performed prior to the deciding.

21. A first station (STA) for exchanging antenna capability information in wireless communications, the first STA comprising:

a transmitter configured to transmit a probe request frame that contains antenna capability information relating to the antenna capability of the first STA, prior to data transmission with a second STA;

a receiver configured to receive a probe response frame that contains antenna capability information relating to the antenna capability of the second STA; and

a processor configured to determine

which antenna capabilities to use for future transmission and reception.

22. The first STA according to claim 20 , wherein the processor is configured to decide which antenna capabilities to use for future transmission and reception without any additional communication.

23. The first STA according to claim 20 , wherein the processor is configured to exchange measurement information with the second STA before it decides which antenna capabilities to use for future transmission and reception.

24. The first STA according to claim 20 , wherein the processor is configured to negotiate antenna capability information with the second STA before it decides which antenna capabilities to use for future transmission and reception.