A new dynamic code allocation CDMA (DCDMA) protocol,which can support voice and data services simultaneously,is investigated in this paper. In DCDMA protocol, a voice terminal will reserve a spreading code only in talkspurt. The base station assigns a code after successfully receiving a request packet through a special request channel at the beginning of each talkspurt. Unlike a voice terminal,a data terminal must contend a spreading code for each packet transmission. So the code utilization can be significantly improved in DCDMA system. An analytical model and computer simulation is performed for evaluating the performance of the DCDMA protocol. The results show that the DCDMA protocol is very effective in utilizing code resource, and the QOS requirement on voice calls is still satisfied while the number of data terminal is increased.
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