同时，鉴于无线链路上传输的不可靠和高误码率，详细介绍了跨层协议设计的相关内容。

Furthermore, the design of cross-layer protocol is described in detail due to the fallibility of wireless links.

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通过对现有协议栈进行改进，加入跨层设计方案则有助于改善下一代无线系统性能。

Therefore the existing protocol stack improved by cross-layer design will be helpful to promote the performances of the next generation wireless system.

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理论分析和仿真实验结果均表明，采用跨层设计思想在现有路由协议的基础上实现的服务发现协议是高效和可行的。

Quantitative analysis and simulation result also show that it's feasible and effective to implement service discovery protocol based on existed route protocols using cross-layer design methodology.

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