无线局域网中的负载均衡技术

随着无线局域网扩展服务集中的终端（STA）的移动和无线信道的时变，各个接入点（AP）上的负载会出现差异，需要加强负载均衡，平衡各个AP的差异，以达到最大化的网络资源利用。无线局域网中的负载均衡算法可以采用STA／AP主控负载均衡或接入式／切换式负载均衡技术。在时分双工的时分同步码分多址（TD—SCDMA）系统中，由于系统在最小资源单位和媒体访问机制等方面的差异，负载均衡可以在小到时隙和码道，大到终端和小区等不同的级别上进行，体现码分多址（CDMA）和时分双工（TDD）的特点，具体方式更加灵活多样。

Load Balancing Technologies in WLAN

Because of the movement of Stations (STAs) and the time-variety characteristic of wireless channels in the Extended Service Set (ESS) of Wireless Local Area Network (WLAN), each AP's load is different. Load balancing needs to be strengthened to balance the diversity of Access Points (APs), so as to use network resources efficiently. The load-balancing algorithm in WLAN may use technologies such as STA/AP host-control load balancing or access/switch load balancing. In a TD-SCDMA system, its minimum resources unit and media access mechanism are different from others, so the load balancing can be realized at different levels: based on time-slot and code-channel, or based on user ends and cells. With the characteristics of CDMA and Time Division Duplex (TDD), the load balancing can be more flexibly implemented.