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A Weakly Synchronous and Distributed Coordination Function for QoS Management in CSMA/CA Wireless Access Networks

This chapter presents a novel weakly synchronous and distributed coordination function, called TimeDivision Unbalanced Carrier Sense Multiple Access (TD-uCSMA). TD-uCSMA relies on synchronization among nodes and the contextual switching of channel access parameters to enable resource management and Quality of Service (QoS) provisioning over CSMA/CA wireless access networks. The TD-uCSMA operating principles and issue of synchronization are presented in detail. Moreover a signalling architecture is here designed, for the first time, to enable dynamic and distributed resource reservation over the wireless network by means of two protocols: the Resource Reservation Protocols with Traffic Engineering (RSVP-TE), properly extended to work in TD-uCSMA networks and the new Resource State Management Protocol (RSMP). The TD-uCSMA operating principles and the signalling architecture are then validated by simulation over many scenarios comprising multi-hop wireless access networks. Finally the chapter addresses the issue of prototyping TD-uCSMA by open source IEEE 802.11 legacy drivers. DOI: 10.4018/978-1-4666-1797-1.ch004