摘要
大型无线局域网环境中移动点在不同AP间进行高速移动时需要进行切换,切换过程产生的延迟会影响无线局域网的服务质量,尤其对于多媒体应用,减小移动点在AP之间的切换延迟是提高无线局域网服务质量的关键。该文提出了确定下一个AP的确认、认证与连接过程开始的最佳距离和最佳接收信号强度的算法,算法结合移动点的移动速度、移动偏移角度等因素来确定最佳切换时机,提高切换成功率,减少切换延迟。算法已在地铁信号系统国产化预研项目中得到应用。
Handoff latency arisen in access points （APs） has become essential issue in wireless local area network （WLAN）. The delay caused by handoff process affects the quality of service （QoS）, such as real-time applications like VoIP. In order to resolve this problem, an improved fast handoff algorithm is proposed to confirm, authorize and connect the next AP. According to the moving speed and excursion angle, a threshold value of distance and received signal strength （RSS） is determined between mobile nodes （MNs） and the connecting AP. This algorithm has been used in a signal system of subway. The test results show that the delay caused by handoff orocess is reduced and the probability of success handoff is increased.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2009年第2期245-248,257,共5页
Journal of University of Electronic Science and Technology of China
基金
部级预研基金
关键词
移动点
服务质量
接收信号强度
无线局域网
mobile node
quality of service
received signal strength
wireless local area network
