摘要
通过分析IEEE802.11 EDCA网络中各优先级节点的能源消耗,利用全概率理论建立网络能源利用率和各优先级节点发送概率的关系模型。针对最优化最小竞争窗口设置问题,提出一种基于最大化网络能源利用率求各优先级节点最优发送概率的算法。在保证每类业务Qo S条件下,首先求出在最大化网络能源利用率下的节点最优发送概率,然后根据节点数目和节点最优发送概率来优化最小竞争窗口的大小,实现最优最小竞争窗口设置,从而提高网络能源利用率。仿真结果表明:该算法相对于EDCA在网络能源利用率方面有较好的表现。
By analysing the energy consumption of each priority-based node in IEEE802.11 EDCA （enhanced distributed channel access） networks ,we build the relational model using total probability theorem in regard to networks energy utilisation rate and transmission probability of each priority-based node. For the problem of setting optimal minimum contention window, we propose an algorithm which calculates the op- timal transmission probability of each priority-based node based on maximising the networks energy utilisation rate. Under the condition of en- suring QoS of each type of service, first it calculates the node optimal transmission probability in maximised networks energy utilisation rate, then according to the number of nodes and the node optimal transmission probability it optimises the size of minimum contention window to re- alise the optimal minimum contention window setting, so as to improve the networks energy utilisation rate. Simulation results show that this al- gorithm shows better performance relative to EDCA in networks energy utilisation rate.
出处
《计算机应用与软件》
CSCD
2015年第5期145-148,152,共5页
Computer Applications and Software
基金
国家自然科学基金项目(61363067
61103245)
广西自然科学基金项目(2012jjA AG0044)
