An Enhanced DQRUMA/MC-CDMA Protocol for Wireless Packet Networks

概要

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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.A random scheme(Scheme I)and a designated scheme(Scheme II)are distinguished depending on the methods which select a request code and a request minislot based on a lattice pool for request accesses(LPRA).Both schemes yield low request access delays due to few or no collisions during request accesses.In Scheme I one of request minislots is selected with a randomly chosen code, while in Scheme II the minislot and the code uniquely used in request attempts can resolve a code collision problem during request accesses.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 average total delay.
社団法人電子情報通信学会の論文
2000-07-25