Patent ID: 7522576
Filing Date: 2009-04-21
Classification: H04W

Abstract:
1. A wireless access method based on Network allocation vector table (NAVT), which is applied to a distributed wireless mobile communication system comprising a plurality of nodes, the NAVT comprises a packet type field indicating whether a packet comes from a transmitting node or from a receiving node and a duration field indicating an expected length of a data transmission and is stored in the respective nodes of the communication system, comprising: on a transmitting side, determining whether only a request to send (RTS) item indicating that a packet comes from a transmitting node is contained in the NAVT when a packet to be transmitted by the transmitting side arrives; sensing a channel to determine whether the channel is busy after determining that only the RTS item is contained in the NAVT; fitting a data length of the packet to be transmitted by the transmitting side to a length shorter than a length of a data transmission obtained by subtracting a predetermined value from the value indicated by the RTS item when it is determined that the channel is busy; sending a RTS packet including the fitted data length of the packet to be transmitted by the transmitting side, or a data packet with fitted data length; and on a receiving side, determining the contents of the NAVT is empty when the RTS packet is received; and sending a clear to send (CTS) packet back to the transmitting side based on a determination of the contents of the NAVT.