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A Slotted CDMA Protocol with BER Scheduling for Wireless Multimedia Networks



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146 IEEE ACM TRANSACTIONS ON NETWORKING VOL 7 NO 2 APRIL 1999 A Slotted CDMA Protocol with BER Scheduling for Wireless Multimedia Networks Ian F Akyildiz Fellow IEEE David A Levine and Inwhee Joe Abstract In future wireless multimedia networks there will be a mixture of different traffic classes which have their own maximum tolerable bit error rate BER requirements In this paper a novel medium access control MAC protocol called wireless multimedia access control protocol with BER scheduling in short form WISPER for CDMA based systems is proposed WISPER utilizes the novel idea of scheduling the transmission of multimedia packets according to their BER requirements The scheduler assigns priorities to the packets and performs an iterative procedure to determine a good accommodation of the highest priority packets in the slots of a frame so that packets with equal or similar BER requirements are transmitted in the same slots The proposed WISPER protocol has been validated using a software emulator on the cellular environment Performance evaluation results based on the implementation are also included in the paper Index Terms BER scheduling code division multiple access multimedia traffic power control priority wireless networks I INTRODUCTION I T IS anticipated that traffic in next generation cellular wireless networks will be a mixture of voice data and video messages Most services and applications currently available in wireline networks will be adapted and extended to the wireless environment Packets generated by future mobile platforms will belong to one of several traffic classes Each of these classes will exhibit a large variety of characteristics and inherent requirements such as transmission rate maximum tolerable bit error rate BER and timeout specifications Because of the expected variability in the transmitted traffic it is predicted that traditional voice based medium access control MAC protocols such as 7 25 29 would perform poorly in future wireless



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