Research On Qos Oriented Resource Allocation In Future Wireless Networks

Future wireless communication networks are moving fast towards the direction of broadband, mobility and IP based. Future wireless networks will support different kind of wireless access technologies, and offer a variety of heterogeneous network evolution path. As a result, manage multiple wireless resources efficiently and let different access networks work together and integrate are the fundamental way of the network operators optimizing resources and achieving the best user experience.Future wireless communication networks need to break through the existing cellular network infrastructure to achieve high coverage and provide the ability of high speed access. Cooperative diversity technology overcomes the limitation of traditional MIMO, presenting a new idea for the practical MIMO. To introduce the cooperative communication to the cellular networks is an important feature of the future wireless communication networks.Power, channel, bandwidth, time slot and code are all important scare resource of wireless networks. However, cooperative diversity due to occupy the resources of source node and cooperative nodes, how to allocate and schedule the resources efficiently is the critical problem of increasing the capacity and guarantee the quality of service. As the cooperative nodes’involvement, compared to direct point to point communication, how to select cooperative nodes should be taken into account. Cooperative communication needs new dynamic resource allocation methods, such as the method joint with node selection, utilizing the systems resource more efficiently and providing the QoS assurance with lower system complexity. As a result, how to efficiently manage and allocate resources and maximize the advantage of cooperative communication are important research topics in the future wireless communication.This dissertation mainly focus on the QoS guarantee and resource allocation issues, including the research on resource allocation framework and procedure, channel-aware and queue-aware based relay selection and power allocation in OFDMA relay networks, node selection and power allocation in wireless self-organized networks with taking into account of cooperative nodes’ benefit, and coordination mechanism of CoMP.First, by learning from the idea of policy-control and service-driven from TISPAN RACS and ITU-T RACF, we propose a pricing-based resource management framework, which has a high versatility and low complexity. Furthermore, under the guidance of the framework, we design a pricing-based QoS control model and some key procedures such as admission control, real-time regulation and so on, adapting to the need of refined management of the network operators, guaranteeing the QoS and maximizing the users’satisfaction.Second, a joint channel-and-queue-aware relay selection and resource allocation scheme at the scheduling phase in an OFDMA downlink cellular network is proposed. Under the premise of satisfying the QoS requirement of the waiting service flow, the utility function consists of the overall power consumption of a packet when it is transmitted between base station to relay station and the relay station to destination and the queue’s state. This scheme prevents the overflow caused by the sudden arrival of high traffic, and allocates the system resources efficiently, guaranteeing quality of service.Third, a Rubinstein bargaining game based relay selection and power allocation scheme in distributed self-organized cooperative networks is proposed. By utilizing unique Nash Equilibrium for the bargaining game to divide the utility of the increased benefits, the cooperative node will be encouraged. Furthermore, the source nodes will choose the nodes which can maximize their own utility. Finally, simulation results verify the effectiveness of the proposed program.Fourth, a distributed inter-eNodeB CoMP cooperation mechanism is proposed, which including how to determine the users’type, cooperative set, the scheduling of the subchannel and the power allocation scheme. Taken the fairness into account, the bargaining based power allocation scheme not only reduces the signaling interaction and lowers the transmission of the pressure on the X2interface, but also take full account of the benefit of the serving cell and the slaving cell, which makes an effective tradeoff between performance and fairness.At last, the summary of the dissertation and the future research directions are given.