Abstract: Reliability and efficiency channel is critical for QoS assurance in wireless network communication. The protocol layers correlated with channel are physical layer and data link layer. The techniques adopted in physical layer is for developing physical layer performances, the techniques adopted in data link layer is for developing data link layer performances which are limited by physical layer performances. In order to assure channel quality, a QoS vertical mapping structure between physical layer and data link layer is proposed, and the structure based on the effective capacity in low SNR ralyeigh flat fading channel is actualized, finally the simulation results verify the model.

Key words: wireless networks, QoS assurance, QoS vertical mapping, effective capacity, Rayleigh flat fading channel

摘要： 无线网络通信中为提供QoS保障，提高链路可靠性和有效性是十分关键的。通信协议中与链路相关的协议层包括物理层和数据链路层。物理层技术以提高物理层性能为目标，数据链路层技术以提高数据链路层性能为目标并受物理层技术制约。为保障可靠通信链路，提出一种无线网络中物理层和数据链路层QoS指标垂直映射结构，并通过等效容量方法实现低信噪比状态下瑞利平坦衰减信道QoS垂直映射；仿真结果验证了所提出模型的有效性。

关键词: 无线网络, QoS保障, QoS垂直映射, 等效容量, 瑞利平坦衰减信道