Patent ID: 7551591

Claim:
A method for data transmission within a wireless local area network (WLAN) which is operable simultaneously with other wireless local area networks (WLANs) in the same local area, wherein each wireless local area network (WLAN) comprises at least one transceiver, the method comprising the steps of: transmitting a signal using a transmitting transceiver of a wireless local area network (WLAN) that conveys data to a receiving transceiver of the same wireless local area network (WLAN) during data transmission intervals with changing frequency bands; changing the frequency band with each data transmission interval in a cyclical order according to a predetermined frequency hopping sequence which is identical for all simultaneously operated wireless local area networks (WLANs); providing a predetermined synchronization policy sequence for each data transmission channel and, wherein the transmitting transceivers of different wireless local area networks (WLANs) use different time shifts for the frequency hopping cycle with reference to a local time point that each transceiver holds, to establish different data transmission channels for the wireless local area networks (WLANs); wherein each wireless local area network (WLAN) comprises a coordinating transceiver for managing the data traffic within the wireless local area network (WLAN); wherein the transceivers transmit or receive a predetermined synchronization signal (sync) during a periodic synchronization time window according to a first synchronization policy sequence; and further comprising the step of transmitting the synchronizing signal within the synchronization time window at a fixed point with respect to the beginning of the synchronization time window during synchronization transmission transmission intervals with changing frequency bands.