Error Management in Wireless Networks

第三代个人通信系统可能涉及许多突发、移动、多媒体用户，其服务质量需求可能随时间动态变化。为了使无线系统充分响应这些需求，有必要确定在无线电环境中分配QoS需求的基本机制。与光纤连接不同，无线电连接可能昂贵且质量较差。因此，服务质量仲裁的很大一部分将必须通过编码和其他链接增强技术来支持。在本提案中，我们首先提出了揭示高阶错误统计在评估特定形式的错误控制对更高层服务的影响方面的重要性的研究结果。然后我们注意到，当通信在分层堆栈上进行时，一个特定的错误控制模块不仅通过其自身的纠错能力，而且通过它传递给更高层的错误事件类型，对整体端到端性能产生影响。因此，我们建议研究误差管理机制，不仅要纠正错误，而且要形成并可能利用逃逸到更高层的残余误差的统计。最后，给定一组最终用户性能需求，可以设想多种方法来分配错误控制函数。因此，我们建议研究如何分配误差控制函数。我们期望所提出的工作将有助于新一代网络无线电的设计。

Third generation personal communication systems are likely to involve many bursty, mobile, multi-media users whose quality of service needs may vary dynamically over time. In order for a wireless system to respond adequately to these demands it will be necessary to determine fundamental mechanisms for allocating QoS needs in the radio environment. Unlike fiber optic links, radio links are likely to be expensive and of poorer quality. Thus, a large part of the quality of service arbitration will have to be supported via coding and other link enhancements techniques. In this proposal, we first present findings that reveal the importance of higher order error statistics in assessing the impact of particular forms of error control on higher layer services. Then we note that when communications are conducted over a layered stack, a particular error control module exerts influence on the overall end to end performance not only via its own error correcting capabilities but also via the type of error events that it passes up to the higher layers. Therefore, we propose to investigate error management mechanisms that not only correct errors but also shape and possibly exploit the statistics of the residual errors that escape to the higher layers. Finally, given a set of end user performance requirements, one can conceive of multiple ways of distributing the error control functions. So, we propose to investigate how to distribute the error control functions. We expect that the proposed work will help in the design of a new generation of network radios.