基于业务请求数据包长度的机会频谱接入算法

摘要

Opportunistic spectrum access for a single secondary user under periodic sensing framework is analyzed aiming for the unslotted primary user network. By constructing the secondary user channel sense and access model, an opportunistic spectrum access algorithm based on user request data packet length is proposed. The proposed algorithm could automatically modify the strategy of opportunistic spectrum access according to the service data packet length allocated by each slot. Experiment results show that the proposed algorithm can enhance the secondary users expect effective throughput under the condition of tight interference, and realize the tradeoff between effective throughput and collision probability. It behaves strong robustness against the exotic environment changes.%针对非时隙主用户网络，研究了单个次用户在周期性感知框架下的机会频谱接入问题。通过建立次用户信道感知和接入模型，提出了一种基于次用户请求业务数据包长度的机会频谱接入算法。该算法根据每个时隙分配给次用户业务数据包长度，自适应调整机会频谱接入策略。仿真结果表明，所提算法能够在干扰水平要求较高情况下，提高次用户平均有效传输吞吐量的同时，实现有效吞吐量与碰撞概率的折中；同时当外部环境发生变化时算法具有较强的鲁棒性。