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IEEE 802.16 standard provides a high-speed channel access to various multimedia services. It specifies both PHYsical (PHY) and Media Access Control (MAC) layers with a special emphasis on the concept of quality of service (QoS). In this paper, the authors address the bandwidth reservation in IEEE 802.16 standard via multicast and broadcast polling mechanisms. It is shown that symmetric user grouping with the same QoS requirements does not change the capacity of the random multiple access system. Binary exponential backoff protocol is then investigated as it is standardized for both multicast and broadcast polling. They establish that symmetric user grouping does not essentially increase the performance of this protocol.
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