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

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。

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

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。

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Cross layer design technique which jointly optimize several layers of protocol stack could improve network performance significantly.

联合优化协议栈中各层的跨层设计技术能够显著提高网络的性能。

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