Development of Self-organized Wireless Network systems

该项目处理带有IP分组和/或ATM单元的Ad-hoc无线网络，用于未来的高级通信网络。该项目的目标是为工厂局域网、校园局域网和应急通信网络提供高可靠、高灵活的无线网络架构。本课题主要研究TDMA和CDMA通信环境下的分层自组织组网、数据错误控制、媒体访问控制。作为为期两年的研究项目，我们得到的结果如下。1)本课题根据网络中无线传输链路的情况，提出了一种集ARQ、FEC和bit - interleave于一体的动态数据误差控制方法。2)在基站与移动台联动的自组织过程中，有效的信道分配协议是构建高性能网络的关键要素之一。本课题提出了三种算法，并通过计算机仿真对其进行了评价，提出了一种考虑相邻链路间干扰的合适信道分配协议。3)提出了两种适用于多媒体通信的媒体访问控制方法；DQRUMA/PAR是由TDMA环境下的DQRUMA创新而来，PRMA/URU是由CDMA环境下的PRMA创新而来。本课题对这些方案进行了评价，并与原有方案和其他流行方案进行了数值比较，证明了它们的有效性。4)在按照计划进度进行研究的过程中，项目发现了一种新的、非常有效的CDMA环境下的访问控制协议，命名为CDMA/CSMA/CF （Code Sense Multiple access with Collision Free Mode）。当我们在CDMA中使用CSMA协议时，该协议保证了无分组冲突，显著提高了系统性能。在本项目中，由于没有足够的时间来检验和展示新协议的整体性能，但我们通过基本的性能评估来确定该协议在未来的无线CDMA通信中具有很大的潜力。少

This project dealt with Ad-hoc Wireless networks with IP packets and/or ATM cells for future advanced communications networks. The objectives of the project is to present high-reliable and high-flexible wireless network architecture for factory LANs, Campus LANs and emergency communications networks. This project mainly focuses on layered self-organized networking, data error control, media access control for both TDMA and CDMA communications environment. As results for two year research project, we obtained as follows.1) This project proposed an dynamic data error control methods which integrates ARQ, FEC, and Bit-Interleaving, depending on the condition of wireless transmission links in the networks.2) In the self-organizing process of linkage between a base station (BS) and mobile stations (MSs), effective channel assignment protocol is one of essential elements in order to construct highly performed networks. This project presented three algorithms, evaluated them by computer simul … More ations, and proposed a channel assignment protocol considering the interference between neighboring links as suitable one.3) This paper presented two media access control methods suitable for multimedia communications ; DQRUMA/PAR innovated from DQRUMA in TDMA environment and PRMA/URU innovated from PRMA in CDMA environment. The project evaluated them and compared with original protocols and other popular one and shown their effectiveness numerically.4) On the process of the research according to the planning schedule, the project found out a new and very effective access control protocol named in CDMA environment named as CDMA/CSMA/CF (Code Sense Multiple Access with Collision Free Mode). When we use CSMA protocol for CDMA, this protocol assure no packed collisions and improve system performance significantly. In this project, there is not sufficient time to check and show the whole performance of new protocol, but we make sure that the protocol has great potential for future wireless CDMA communications by the basic performance evaluations. Less