DS/CDMA prototype system transmitting low bit-rate voice and high bit-rate ISDN signals

Doi, Nobukazu; Yano, Takashi; Kobayashi, Naoto

doi:10.1109/vetec.1994.345167

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…For voice CDMA systems based on the IS-95 standard, power control is used to combat the near-far problem by maintaining nearly constant received power at the base station [6]. If this conventional power-control scheme applies for multimedia traffic without any modification, the capacity is largely limited by the traffic with the lowest BER requirement [1], [5], [6], [26]. In other words, voice packets can typically tolerate BER's of up to 10 while data packets require BER's below 10 Consequently, it is wasteful to schedule simultaneous transmissions of voice and data packets, since the transmission channel must be able to satisfy the most stringent BER specification among all the packets that are being transmitted at the same time.…”

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confidence: 99%

A slotted CDMA protocol with BER scheduling for wireless multimedia networks

Akyildiz

Levine²,

Joe

1999

IEEE/ACM Trans. Networking

163

150

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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.

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confidence: 99%