Quality of Service (QoS) support is provided by means of a Tiered Contention Multiple Access (TCMA) distributed medium access protocol that schedules transmission of different types of traffic based on their service quality specifications. In one embodiment, a wireless station is supplied with data from...http://www.google.com/patents/US7095754?utm_source=gb-gplus-sharePatent US7095754 - Tiered contention multiple access (TCMA): a method for priority-based shared channel access
