Provided by: Universidad Nacional Autonoma de Mexico
Date Added: Jun 2011
The IEEE 802.16-2004 standard supports the following two operating modes of the Medium Access Control (MAC) sub-layer: Point to MultiPoint (PMP) mode, where traffic occurs only between the Base Station (BS) and Subscriber Stations (SSs), and b) mesh mode, where traffic can be routed through other SSs and can occur directly between SSs. In mesh mode, system throughput can be increased by using multiple-hop paths. Thus, Wireless Mesh Networks (WMNs) can be used to extend cell ranges, cover shadowed areas and enhance system throughput. The IEEE 802.16 mesh protocol has defined two kinds of scheduling mechanisms: distributed and centralized. In the former, a Mesh SS (MSS), also termed a node, competes for channel access using a pseudo-random election algorithm.