摘要
对IEEE802.11分布式协调功能(Distributed coordination function,DCF)的公平性进行了分析,指出了采用DCF方式进行接入控制时,因二进制指数退避算法的不合理而导致信道分配不公的问题。在结合二维马尔科夫链模型对系统进行分析的基础上,提出了一种基于检测网络负载的自适应退避算法LDBSB(Load detection based self-adapt backoff)。理论分析及仿真实验表明,所提算法在网络吞吐量、时延和公平性等方面较二进制指数退避算法有明显的改善。
The fairness of distributed coordination function（DCF） in IEEE802.11 is analyzed.It is pointed out that weaknesses of channel allocation unfairness when using DCF access control scheme due to its inherent nature of binary exponentially backoff algorithm.To address this problem,a self-adapt backoff algorithm,called the LDBSB（load detection based self-adapt backoff）,is presented based on two-dimensional Markov chain model.Theoretical analysis and simulation results show that the algorithm improves performances on through-put,delay and fairness compared with the binary exponentially backoff algorithm.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2010年第6期769-773,共5页
Journal of Nanjing University of Aeronautics & Astronautics
关键词
AD
HOC网络
分布式协调功能
退避算法
公平性
Ad Hoc networks
distributed coordination function（DCF）
backoff algorithm
fairness
