Research On Adaptive Wireless Communication Technology

Multi-network fusion transmission technology has become one of the important technologies in the future development of communication networks.In the multi-network fusion transmission technology,the fusion network of wireless transmission technology has gradually become an important research direction.With the rapid development of semiconductor technology and integrated circuit,a communication terminal is often equipped with a variety of network card devices to support connection to different networks.For example,a smartphone supports WIFI wireless connection and LTE wireless connection.However,traditional network communication only transmits data through a single network link,which leads to the unutilized resources of other network links and causes the waste of resources.In order to build a wireless heterogeneous network,the wireless heterogeneous network of LTE and WIFI is constructed through the Multipath Transmission Control Protocol.MPTCP can split the single-path transmission data packets into multiple data packets.Compared with single-path TCP,MPTCP has higher reliability.In MPTCP transmission,transmission will be interrupted only when all paths fail,while traditional TCP transmission will interrupt transmission once the link fails.MPTCP can utilize multiple network links at the same time,which can better use of network resources than traditional TCP.There are also major problems to be solved in MPTCP transmission technology.In a wireless heterogeneous network,the congestion control algorithm in MPTCP and the performance of MPTCP data scheduling algorithm will be greatly tested due to the significant changes in key performances such as transmission bandwidth and round-trip delay between each wireless link.Firstly,the congestion control algorithm of MPTCP does not consider the state of the shared bottleneck,but mainly considers the network fairness.This default congestion control algorithm severely limits the bandwidth of MPTCP links at the non-shared bottleneck,which seriously affects the transmission efficiency of MPTCP.In order to solve the problem that the default congestion control algorithm over-limits the performance of MPTCP,a new congestion control algorithm should be designed,which can determine the shared bottleneck of the links,and realize the fairness between MPTCP and TCP by coupling the links to the shared bottleneck.It can also decouple non-shared bottleneck links,and increase the utilization of link resources.Secondly,in a wireless heterogeneous network,the existing date scheduling algorithm of MPTCP is designed based on the performance of sub-streams,without considering the characteristics of transmitted packets,and the same data scheduling algorithm is used for processing both delay-sensitive data and non-delay-sensitive data.Therefore,it is necessary to design an adaptive data scheduling algorithm to transmit data of different business types.In order to solve the above problems,the main solutions in this thesis are as follows:First,in order to solve the problem of the shared bottleneck judgment and congestion control,a multi-path shared bottleneck detection method based on BBR algorithm is proposed.This method can evaluate the transmission performance of each sub-stream in wireless heterogeneous network,and perform congestion control according to the judged shared bottleneck results.Second,according to the characteristics of different business types,a Bayesian classification model with weighted eigenvalues is proposed,classify the transmitted data by the data classification model,which provides support for the next adaptive data scheduling.Third,in view of the problem that data scheduling cannot realize classification scheduling,an adaptive data scheduling method is proposed,which can select the corresponding data scheduling strategy according to the results of data classification.