Patent ID: 8411663

Claim:
A method of operating a wireless data communication system, the system including an access point and a plurality of stations associated with said access point, and each for exchanging wireless data communication messages with the access point, the access point polling said stations, said stations transmitting messages to said access point only in response to being polled by said access point, the method comprising: the access point polling each of said stations during a polling cycle, said polling cycle being repeated; and during each polling cycle, authorizing a respective one of said stations to include in a poll response from said authorized station a data unit addressed to another one of said stations, said data unit for transmitting to said another one of said stations a data frame from a first pre-determined type of data frame, said authorized station being the only station authorized during said each polling cycle to include in a poll response a data unit addressed to another station including a data frame from the first pre-determined type of data frame, wherein, during each said polling cycle, all of said stations are allowed to include in a respective poll response a piggyback data unit addressed to one of said stations, said piggyback data unit for transmitting a data frame from a second pre-determined type of data frame that has a higher priority than said first type of data frame.