A New Medium Access Control Protocol for TDD Mode Wideband CDMA Wireless Local Area Networks

It is well known that TDD mode wideband CDMA is particularly suited for wireless local area networks (LANs). In this paper a medium access control (MAC) protocol is proposed for wireless multimedia LANs that are based on TDD mode wideband CDMA. In order to minimize interference experienced by a packet and to satisfy bit error rates (BERs) of multimedia traffic, a minimum-power allocation algorithm is derived to determine the received power levels of code channels that are allocated to a mobile terminal. Based on the minimumpower allocation algorithm, the maximum system capacity is investigated, which points out that both rateand BER-scheduling is required in order to achieve maximum system capacity. Using minimum power allocation and rateand BER-scheduling, a new packet scheduling scheme is proposed to accommodate packets in time slots. Simulation is carried out to evaluate the proposed MAC protocol. Results show that the proposed MAC protocol greatly improves the performance of TDD mode wideband CDMA wireless multimedia LANs.