Collision avoidance in IEEE 802.11 contention free period (CFP) with overlapping basic service sets (BSSs)
a technology of overlapping basic service sets and avoiding collisions, which is applied in the field of wireless network protocols, can solve the problems of physical limitations of physical networks, and limited access to network nodes, and achieve the effect of facilitating the effectiveness of hardware or softwar
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first embodiment
[0035] Said first embodiment may further comprise a new counter called Overlapping Network Allocation Vector (ONAV) to render the RTS / CTS during CFP truly effective even in the existence of the STAs in CFP in the case of overlapping BSSs.
third embodiment
[0036] the invention provides a hybrid wireless MAC protocol for isochronous traffic support which uses a novel Ready To Send(RTS) / Clear To Send(CTS) exchange during a contention free period (CFP) in order to avoid contention from Stations (STAs) in overlapping BSSs, combined with a new counter called Overlapping Network Allocation Vector (ONAV) to render the RTS / CTS during CFP truly effective even in the existence of the STAs in CFP in the case of overlapping BSSs.
[0037] More particularly, the inventions disclosed herein utilize a work frame which could included and used in a conventional WLAN such as that shown in FIG. 1. Within the invention, the network frame starts with a beacon transmission from the access point (AP) to all the stations (STA) in the receiving range of the AP (as shown in FIGS. 2 and 3). The beacon includes the information about the time slot allocation for each STA, synchronization information and information about the AP itself, which is necessary for new STA...
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