An enhanced DQRUMA/MC-CDMA protocol for packet-based voice/data traffic

We introduce an enhanced DQRUMA/MC-CDMA protocol for mixed voice and data traffic in wireless packet networks. The original DQRUMA/MC-CDMA protocol may suffer severe code collisions due to a limited number of request codes. An enhanced DQRUMA/MC-CDMA protocol using minislots for request accesses is proposed to reduce request collisions. In the proposed protocol, request attempts are transmitted concurrently with data packets of other calls. The performance of the proposed protocol is evaluated by simulation and the result shows that the proposed protocol outperforms the original DQRUMA/MC-CDMA protocol in terms of the average total delay and packet loss rate.