Development of Self-organized Wireless Network systems

该项目针对未来先进的通信网络，研究具有IP分组和/或ATM信元的自组织无线网络。该项目的目标是为工厂局域网、校园网和应急通信网络提供高可靠性和高灵活性的无线网络架构。本课题主要研究TDMA和CDMA两种通信环境下的分层自组织组网、数据差错控制、媒体接入控制。在两年的研究项目中，我们取得了以下成果：1)根据网络中无线传输链路的情况，提出了一种综合了ARQ、FEC和比特交织的动态数据差错控制方法。2)在基站(BS)和移动台(MS)之间链路的自组织过程中，有效的信道分配协议是构建高性能网络的关键因素之一。本课题提出了三种算法，并用计算机仿真…对其进行了评估3)提出了两种适用于多媒体通信的媒体接入控制方法：DQRUMA/PAR在TDMA环境下由DQRUMA改进而来，PRMA/URU在CDMA环境下由PRMA改进而成。4)在按照规划进度进行研究的过程中，本课题发现了一种新的、非常有效的码分多址接入控制协议--CDMA/CSMA/CF(Code Sense Multiple Access with Collision Free模式)。当我们将CSMA协议用于码分多址时，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，没有足够的时间来检查和展示新协议的整体性能，但通过基本的性能评估，我们确定该协议在未来的无线CDMA通信中具有很大的潜力。较少

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