Research Of Radio Resource Management Technology In Heterogeneous Network

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.