Research On Sending-end Data Allocation Scheme In Multi-path Parallel Transmission

With the continuous evolution of various access technologies and standards and the ever-increasing demands of users for diverse applications,various wireless networks using different access technologies are being rapidly deployed by operators in various application scenarios.In a heterogeneous network scenario where multiple wireless networks cover simultaneously,the terminal can use multiple paths to transmit data through multiple interfaces at the same time,thereby fully utilizing the effective bandwidth in the system and increasing the data transmission rate.However,the differences in bandwidth,delay,and power consumption of multiple paths may cause data disorder at the receiver,which lead to receive buffer blocking and the throughput decrease.In order to reduce the impact of path differences on the transmission performance of heterogeneous network Concurrent Multipath Transfer(CMT)systems,a data distribution scheme DDMTCP is proposed.Firstly,based on the existing delay prediction model,the impact of path capacity is considered,and an accurate forward transmission delay prediction model is proposed.Then,the path to be allocated is selected according to the predicted delay value.In order to fully utilize the idle bandwidth in the system,the path capacity constraint is considered,and the least delay path with the path capacity is selected as the path to be allocated,excluding the path without path capacity but with minimum delay.when allocating a packet for the path to be allocated,the transmitter no longer uses the first-in first-out data allocation method,but calculates the DSN number for the allocating path,the number is decided by the path which without path capacity but is the minimum delay path.That is,Before the packet transported by the path to be allocated arrives at the receiver,how many data packets pass through the path without path capacity but with minimum delay arrives already.Skipping the number of packets calculated berore and taking the corresponding packet in the sending buffer area.The simulation results show that the sender uses the scheme of this paper to allocate data for each path,which can effectivelyreduce the out-of-order degree of packets at the receiver and improve system throughput.Based on the above allocation scheme,a data distribution scheme IEMTCP for improving the energy utilization is proposed.Firstly,a path energy calculation model is established by analyzing the process of data packet transmission in the system.Then,a new energy consumption-related congestion window adjustment strategy is designed according to the obtained path energy consumption value.The goal of the strategy is to increase the transmission ability of the path with lower energy consumption by increase the capacity of the path.Finally,the path to be allocated is selected by defining a path evaluation factor related to the power consumption and the transmission rate,and the DSN number of allocating packet is calculated with the same method in DDMTCP.The simulation results show that using the scheme of this paper to allocate data packets for the path can reduce the system energy consumption without sacrificing system throughput.