Research On Resource Grid Allocation Based Energy Saving Access Selection Algorithm In Heterogeneous Wireless Networks

The development trend of future network is broadband, mobilization, all IPintegration of heterogeneous network, which can provide user with seamless roamingand high quality service experience, and meet user’s personalized needs of traffic. Asa key technology to achieve the integration of heterogeneous wireless networks,access selection which can choose the appropriate network for user to accessaccording to network status and user needs, let user always roam in the optimalnetwork, is a research hotspot in recent years.Meanwhile, with the increase of network type and quantity, the energy problemof the network side is becoming more and more serious, which is can’t be ignored. Bysummarizing and analyzing research status both domestic and foreign, the authordiscovered that the existing access selection mechanism tend to the user perception,business type, load balancing, terminal status as the optimization goal, less considerthe energy consumption of the network side; The existing energy saving accessselection mechanism which have considered the energy problem of the network sidealways take a single network for example, the forward-looking and networkcollaboration between degree is not enough, so there has a certain limitation.Therefore, reasonable design of energy saving access selection algorithm haveimportant guiding significance for implementing green mobile communication.Based on a hierarchical semi-centralized network structure which suitable forheterogeneous wireless networks collaborative energy saving algorithm, a networkcooperation based energy saving access selection algorithm in heterogeneous wirelessnetworks is proposed. The algorithm firstly divides carrier frequency into threecategories according to the working status of the carrier frequency in LTE/WiMAXsystem; then determines the target access network according to the trafficcharacteristics of the newly arrived user and the resource consumption case of eachnetwork in heterogeneous system; Finally, according to the open case and load case ofthe carrier frequency in the target network to formulate optimal access strategy. Theproposed algorithm is able to make full use of spare resources in the network, avoidopen closed carrier frequency and save the energy consumption in network.In order to further enhance the performance of the algorithm, this paperintroduces divide-flow into heterogeneous wireless networks in collaborative energysaving, and an energy saving access selection algorithm by dividing flow inheterogeneous wireless networks is proposed. When the user arrives, the algorithm can calculate the optimal flow-dividing ratio of the user’s traffic according to the typeand resource requirement of the traffic. If the optimal flow-dividing ratio is1, the userwill be accessed to the LTE or WiMAX, if the optimal flow-dividing ratio is not1, thealgorithm firstly builds a mathematic model of the system energy consumption andthe flow-dividing ratio according to the open case and the load case of each carrierfrequency in the heterogeneous system; then chooses the minimum system energyconsumption as the target function to solve the optimal flow-dividing ratio; Finallyaccesses the user’s traffic to the LTE and WiMAX on the basis of the optimalflow-dividing ratio to further enhance network resource sharing ability, reduce thepossibility of open closed carrier frequency. Simulation results show that the proposedtwo algorithms can ensure users QoS, at the same time reduce the number of carrierfrequency opened in the system, save the energy consumption of network, and have agood innovativeness and effectiveness.The research work of this paper will provide a new train of thought for thedesign of energy saving access selection algorithm in heterogeneous wirelessnetworks.