- 期刊
OVSF Code Management Schemes on Ad Hoc Networks
並列摘要
Ad hoc networks are wireless networks without fixed infrastructure. Each mobile node in the network may move arbitrarily, explaining why network topology changes frequently and unpredictably. Consumer demand for wireless ad hoc networks to support a variably high data rate and bounded delay on multimedia services have grown. Therefore, designing efficient MAC protocols for ad hoc networks has received intensive attention. However, the single orthogonal variable-spreading-factor code (OVSF) CDMA systems, which is developed originally for third generation wireless standards UMTs/IMT-2000 to address the increasingly higher and variable rate requirements of multimedia applications, is promising as MAC layers of ad hoc networks. Previous OVSF code management schemes are centralized and cannot be applied directly to fully distributed systems such as ad hoc networks. Therefore, this work presents six OVSF code management schemes on ad hoc networks: three of them heavily exploit two techniques, i.e., code exchange and code tree management. Using ns-2, we perform simulations to demonstrate that the proposed OVSF code management schemes can significantly reduce the call-blocking rate.
延伸閱讀
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