WiMax系统及其QoS机制研究

光纤技术的普遍应用使骨干网的承载能力大大提高，造成接入网成为业务的。瓶颈”。宽带无线接入系统WiMax具有带宽利用率高、覆盖范围大以及支持移动性等优点，是采用无线方式打破接入网。瓶颈。的重要一步。WiMax系统虽然给接入网增加了许多新的特性，但也带来了许多新问题，比如无线环境中的安全保证、动态资源管理、移动性管理等，特别是QoS机制，是复杂通信环境中提供可靠的端到端业务的重要保证。这些问题需要在实践中不断完善加以解决。

WiMax System and its QoS Mechanism

The wide application of optical fiber has greatly improved the bearing capability of the bone network. However, communication services have a bottleneck at the access network. WiMax system, a kind of broadband wireless access system enables efficient utilization of bandwidth, has a broad coverage, and supports mobility. It plays an important role in wireless solution to the bottleneck at the access network. Though WiMax system brings a lot of new characteristics for the access network, it also brings new problems as of security in wireless environment, dynamic resource management, mobility management, and especially QoS that is an important guarantee for reliable end-to-end services in complex communication environments. Therefore, it is necessary to improve WiMax system in practice and work the problems out.