On Radio Resource Management Of Wireless Networks

With the development of wireless communication technologies, we’re experienc-ing the increasing convenience from that. Meanwhile, heterogeneous wireless net-works will be the future wireless system directions. The traditional separate manage-ment mode causes the waste of resource, and does not satisfy our persistent service requirements. Therefore, radio resource management is a hot topic for wireless com-munication systems. It focuses on the efficient utilization and sharing of the system resource through fine assignment and domination, and thus users will be served with high QoS.This dissertation follows the direction of downside to upside, discusses the radio resource management with respect to base station level, stream level and system level, and explores the resource management schemes and strategies from resource sharing and assignment to access control of heterogeneous wireless networks. The main achievements and results of this dissertation are listed as follows:1. Inter-cell frequency reuse is established as a game theoretical model. The existence of the equilibrium solution and the convergence of the process are proved. Based on the features of the model, a distributed algorithm AMRG is proposed. Ac-cess points continuously learn the surrounding information and adjust their actions, aiming at maximizing the system throughput. Simulation results show that AMRG algorithm has a tradeoff on convergence rate and the number of required frequencies;2. With the established inter-cell frequency reuse, resource sharing among multi-hop users in a cell is also discussed. For users with a same kind of traffic, a negotiation-based TDMA protocol, N-TDMA, is proposed to share slots distributively. It has a similar performance to the traditional central coloring algorithms, and the con-vergence speed is twice that of DRAND. Besides, two coloring algorithms, C-TDRS and S-TDGRS, are proposed to share the resource fairly among users with different traffic types. Simulation results show their improvements on the fairness and effec-tiveness compared to the existing algorithms. Furthermore, S-TDGRS performs better than C-TDRS, and it is an effective resource sharing scheme;3. The future wireless network will be heterogeneous, with different access tech-nologies co-existing. Therefore, an open and flexible resource management architec-ture is designed. A uniform management model is designed for different level equip-ments and terminals. They separate the action of decision and execution. This archi- tecture is the foundation for the following research;4. The heterogeneity of the future network endues access control with more meanings. A policy-based access scheme Er-G-JRRM is proposed, and it is user-centric. The initial network selection works on a random mode, for the sake of dis-tributing users to different networks. Load balancing contains network re-selection and user prioritization. Each overloading network judges the vertical handover according to the resource it gets. This two-step scheme has significant superiority on the drop-ping probability and the served ratio. Moreover, access control is bi-directional for the heterogeneous wireless networks. Not only the user selects the network, but also networks choose users. GRA-BKP algorithm is then proposed. Users examine all available networks through QoS, price and service by GRA, and try to access the one with the highest integrated performance; and each network compares the available and the requested resource amount, formulates the admission issue as a knapsack problem, and then users which could bring the greatest profit will be admitted. The whole procedure takes both user requirements and network profit into consideration, and benefits them at the same time.