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In a wireless communication system having smart antennas and comprising a plurality of wireless transmit/receive units (WTRUs), a method and apparatus for transmitting and receiving data comprises a first WTRU transmitting a request for antenna (RFA) frame to a second WTRU. The second WTRU receives

In a wireless communication system having smart antennas and comprising a plurality of wireless transmit/receive units (WTRUs), a method and apparatus for transmitting and receiving data comprises a first WTRU transmitting a request for antenna (RFA) frame to a second WTRU. The second WTRU receives the RFA frame and determines a preferred antenna to receive a dataframe transmission. The first WTRU transmits the dataframe on the preferred antenna.

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1. A method, implemented by a first wireless transmit/receive unit (WTRU), for maximizing the performance of a radio link between the first WTRU and a second WTRU, the method comprising: the first WTRU receiving signals containing specific antenna IDs from the second WTRU;the first WTRU determining

1. A method, implemented by a first wireless transmit/receive unit (WTRU), for maximizing the performance of a radio link between the first WTRU and a second WTRU, the method comprising: the first WTRU receiving signals containing specific antenna IDs from the second WTRU;the first WTRU determining that the second WTRU is equipped with smart antennas based on the received signals;the first WTRU determining whether the use of smart antennas would improve transmission performance based on parameters associated with the received signal; on a condition that the first WTRU determines the use of smart antennas would not improve transmission performance: the first WTRU configuring a Request Antenna ID field of a Request for Antenna (RFA) frame with a value indicating that the first WTRU does not require any specific antenna to be used for transmission;the first WTRU transmitting the RFA frame to the second WTRU; andthe first WTRU transmitting a data frame to the second WTRU without the use of smart antennas;on a condition that the first WTRU determines the use of smart antennas would improve transmission performance: the first WTRU determining which antenna beam will maximize performance; on a condition that the first WTRU does not determine which antenna beam will maximize performance: the first WTRU configuring the Request Antenna ID field of the RFA frame with a null reserved field value; the first WTRU transmitting the RFA frame to the second WTRU; and the first WTRU transmitting a data frame to the second WTRU;on a condition that the first WTRU does determine which antenna beam will maximize performance: the first WTRU configuring the Request Antenna ID field of the RFA frame with a value corresponding to a preferred antenna beam for transmission; the first WTRU transmitting the RFA frame to the second WTRU; and the first WTRU transmitting a data frame to the second WTRU, using the preferred antenna beam. 2. The method of claim 1 wherein the received signals are queries. 3. The method of claim 1 wherein the received signals are beacons. 4. The method of claim 1 wherein the received signals are probe responses. 5. The method of claim 1 wherein the parameters are power at which the packets were received, signal to noise ratios, signal to interference ratios and/or error rates. 6. The method of claim 1 wherein the RFA frame further comprises a frame control field, a duration field, a receiver address (RA) field, a transmitter address (TA) field, a transmission (TX) length field, a date rate field, and a frame checksequence (FCS) field. 7. The method of claim 1 wherein the RFA frame is a control frame. 8. The method of claim 1 wherein the RFA frame is a management frame.