【作者】 张昕然；

【导师】 靳浩；

【作者基本信息】 北京邮电大学 ， 通信与信息系统， 2013， 硕士

【摘要】 本文主要研究了异构无线系统的三种无线资源管理技术,主要场景为TD-SCDMA/TD-LTE异构蜂窝网络和集成LTE/WLAN异构网络,并对上述两种场景的异构无线系统的小区重选技术、负载控制技术、资源调度技术以及资源管理架构进行了详细的研究。主要工作和创新点归结如下：1.针对TD-SCDMA/TD-LTE异构蜂窝网络,提出了改进的小区重选方法,基于3GPP协议中定义的跨系统小区重选方法做出改进,实现了对于指定小区的重选控制,以防止网络发生过载,降低过载概率,提升平均用户QoS；进一步地,采用二维马尔可夫模型,依照路损模型对网络进行建模,推导出网络的性能指标,并采用MATLAB仿真给出了原方案和改进的小区重选方案的性能差异。2.针对集成LTE/WLAN异构网络,提出了一种分离式负载控制模型,该模型针对已有的负载控制模型计算复杂度过高的问题,采用分离式的建模思路,通过构造一系列简单的SMDP线性规划问题来逼近原问题,极大地降低了问题的计算复杂度,同时针对实际的异构系统给出了该负载控制算法的具体流程；为了评价分离式负载控制模型的正确性,通过MATLAB仿真结果给出了原模型和新模型的策略结果对比以及性能差异。3.针对异构无线系统的分层数据流传输场景,给出了数据子层颗粒度的资源调度流程,包括终端确定其绑定数据子层数目的方法,网络确定其转发数据子层的方法,以及转发节点的拥塞控制策略；并且,针对本文提出的所有异构无线系统的资源管理技术,给出了一种资源管理架构模型,定义了架构内的功能实体来完成所有提出的资源管理功能,并给出了网络架构和具体的资源管理流程。更多还原

【Abstract】 This work mainly focuses on3types of radio resource management techniques in heterogeneous wireless system. Primary scenarios include TD-SCDMA/TD-LTE heterogeneous cellular network and integrated LTE/WLAN heterogeneous network. Detailed technical solutions including cell reselection technique, load control technique, resource scheduling technique and RRM structure are investigated in these two scenarios. Primary work and innovations are summarized as follows:1. For TD-SCDMAA/TD-LTE heterogeneous cellular network, an enhanced cell reselection mechanism is proposed based on existing3GPP protocol for inter-system cell reselection, which achieves the control of cell reselection behavior to prevent load, decrease overload probability and increase average QoS; Furthermore, a2-dimensional markov model is build based on path loss model. The network criteria are derived and evaluated by MATLAB simulation, which illustrates the difference of performances between the original mechanism and the proposed mechanism.2. For integrated LTE/WLAN heterogeneous network, a separate load control model is proposed to solve the computational complexity problem of existing load control model, by utilizing the separate modeling method to build a series of simple SMDP linear programming problem to approximate the original problem, which greatly decreases the computational complexity. Algorithms of the proposed load control model in actual heterogeneous system are described in detail. To verify the rationality of the separate load control model, by utilizing MATLAB simulation we evaluate the difference of performance between policy results from the original model and the proposed model.3. For the layered streaming transmission scenario in heterogeneous wireless system, a set of resource scheduling mechanism is proposed, including the mechanism to determine user equipment’s subscription number of layered stream, the mechanism to determine the transmission number of layered stream for the network, and the congestion control strategy of forwarding nodes; Furthermore, to integrate all the proposed radio resource management techniques in heterogeneous wireless system, a radio resource management structure is proposed. Entities within the structure are defined to accomplish all management function, and detailed network structure and management process are described.更多还原