Modeling And Performance Analysis For Wireless Communication Protocols

Over the past 20 years, with the means of communication to enrich and the universal application of the Internet, an endless stream of new business, a powerful incentive in the demand and the strong support of the technology, communications experience from narrow-band to broadband, from cable to wireless, from fixed to mobile of the tremendous .Standardization in the field of communication is extremely important. IEEE 802 Working Group to standardize access network research, LAN IEEE 802.11, IEEE 802.16 MAN, and WAN IEEE 802.20, and IEEE 802.21 . IEEE 802 standardization work with the corresponding association and the Union effort to promote the industrialization of norms. With the IEEE 802.11 Working Group corresponding to the Wi-Fi Alliance, corresponding with the IEEE 802.16 is WiMAX Forum.IEEE 802.11 wireless LAN area, to achieve the "final 100 m" Access. Wireless LAN can access the core network, fixed network as a wireless extension, and may also have a high-speed performance and greater coverage of mobile technology, as 2G and 3G mobile network packet access network. From a market perspective, this is by far the most successful wireless access system. Inter embedded it in laptops, providing greater convenience for the broad application of this technology.IEEE 802.16 wireless MAN areas, to achieve the "last mile" access. It is made after initial practice of IEEE 802.11 and base a full analysis on the new demand. The release of IEEE 802.16 standard is of important significance, it is the first second-generation broadband wireless access system to produce signs, and will become the mainstream broadband access system.Ad Hoc network is self-organizing wireless network in the complex and dynamic environment. Mobile Ad Hoc network is characterized by strong network flexibility to support mobile, easy to quickly start system and stronger resistance to destruction.Through the establishment of mathematical models to analyze the performance of communication protocol is an important method. In this paper, we give Markov model of the competitive bandwidth for IEEE 802.16 in PMP mode, analysis the relationship between the delay and competition window size, the number of users stations and the slot number in each frame . IEEE 802.16 support QoS, But it did not give concrete realization of the programme, to the different needs of businesses under their own development, we realize it in NS-2 and verified by simulation. There are a number of models On IEEE 802.11 MAC under saturated condition, this paper gives a closed queueing model for IEEE 802.11 under saturated condition and a Markov model for IEEE 802.11 MAC under non-saturated condition, calculate the average delay , the validity of the model is verified. Against local congestion could lead to decline in the performance of routing protocols, the classic AODV routing protocol in Ad Hoc networks was improved.This paper is structured as follows:In the first chapter, we briefly introduced the Ad Hoc networks and IEEE 802.16, IEEE 802.11 Standards, as well as network simulation software NS-2. In the second chapter, we have established a Markov model for IEEE 802.16 in PMP mode, simulation results show model is more accurate. Chapter III, we give a support Qos bandwidth scheduling algorithm for IEEE 802.16, and implemente it in NS-2. In the fourth chapter, we give a closed queuing model for IEEE 802.11 DCF under the saturated condition , and gives the formula for calculating the average delay. Chapter V, for IEEE 802.11 DCF under the non-saturated conditions, a Markov model is gived. In the sixth chapter, we have improved AODV routing protocols . Chapter VII is the conclusion.