摘要
基于IEEE 802.11协议的无线局域网(WLAN)能够为无线多媒体应用提供足够的带宽,由于无线接入点AP(Access Point)发射功率受限,其服务覆盖范围也因此受限,这使得终端在移动过程中需要在不同AP之间频繁地切换,由此带来的时延严重影响了无线多媒体应用的服务质量。因此,提出一种基于信道掩码和优先级的选择扫描策略和选择性邻居图缓存算法,增大了命中缓存的概率,减少了扫描的信道数量和系统信令开销。仿真结果表明,该切换方案可以有效降低移动节点MN(Mobile Node)在共享WiFi(Wireless Fidelity)系统中不同AP间的切换时延,满足了无线多媒体业务(如VoIP)的传输要求。
Wireless local area network （WLAN） based on IEEE 802.11 protocols can provide sufficient bandwidth for wireless multimedia applications, since the AP transmit power is limited, its service coverage also limited, which makes the terminal switch frequently between different APs, and the latency of handoff which is caused by the mobility of the MN affects the quality of service of wireless multimedia applications. Therefore, in this paper we propose the selective scan strategy and selective neighbor graph caching algorithm based on the channel mask and switching priority to increase the probability of hitting the cache and reduce the number of channels and system signaling overhead scanning. The simulation results indicate that the handoff mechanism can effectively reduce the handoff latency of mobile node between different APs in Sharing WiFi Platform, and meet the wireless multimedia services （such as VoIP） transmission requirements.
出处
《微型机与应用》
2017年第13期13-15,18,共4页
Microcomputer & Its Applications
