Research On Cellular Network Link-aggregation Based On Mobile Terminal

Cellular network has the characteristics of wide coverage,small handover delay,and strong continuity.At present,more and more mobile terminal data is transmitted through the cellular network,so the cellular network load capacity needs to be further improved.The bandwidth and stability of the deployed LTE cannot fully meet the increasing demand of data transmission.In order to enhance data transmission capabilities,ISP(Internet Service Provider)is committed to researching cellular network link aggregation technologies in order to increase the bandwidth of cellular network.ISP studies the link aggregation of eNB to the Internet segment.The principle is that in LTE,according to the different data services,MME(Mobility Management Entity)is selected different eNB(Evolved Node B)to transmit data,thereby increasing the system's load capacity.However,the mobile terminals cannot improve the link bandwidth directly througth the link aggregation technology of ISP.In this paper,we will study the cellular network link aggregation from data source to eNB to increase link bandwidth and improve QoS(Quulity of Service).The main work of this paper includes:(1)Researching on the link aggregation technology of cellular network.According to the similarities and differences between the relay systems of the aggregated sub-links,the cellular network link aggregation is divided into intra-group aggregation and inter-group aggregation.This paper studies the LACP(Link Aggregation Control Protocol)based on the IEEE 802.3ad standard and LACP controlled link aggregation model.Analyze the technical difficulties of cellular network link aggregation with the same frequency interference and load balance.Based on the mobile terminal SIM7100 CE,propose the same frequency interference suppression strategy and load balancing strategy,and apply to the design and implementation of the cellular network link aggregation control system.(2)Designing and implementing the cellular network link aggregation control system CNLA_CS(Cellular Networks Link Aggregation_Control System).The design requirements of CNLA_CS are proposed.According to the requirements,CNLA_CS is divided into different sub-modules,and each sub-module is studied and implemented.CNLA_CS can dynamically acquire and modify each sub-link format,frequency band,connection/disconnection,and NAT(Network Address Translation),etc.,and classify andmanage sub-links according to the same frequency interference suppression strategy.According to the load balancing policy,CNLA_CS dynamically switches the combinations of sub-links,maintains the physical sub-links formed by cellular networks and eths,and dynamically sets forward policy routing,backward routing,and NAT.Build a test platform to test the performance of CNLA_CS sub-modules and the overall performance of CNLA_CS.(3)Designing and implementing the cellular network link aggregation system.In this paper,we will study the function of the submodules of the aggregation system and build the system architecture.Combined with CNLA_CS,we complete the initialization of sub-modules and implement the cellular network link aggregation system.Analyze the principle and role of the aggregation system tunnel model and each layer link in the model.The test system transmits data performance,compares individual cellular network links under different formats,and verifies that the cellular network links aggregation system can linearly increase the bandwidth of the cellular network.