Research On Multi-link Multi-service Scheduling In Heterogeneous Wireless Networks

With the rapid development and in-depth integration of wireless communication technologies such as mobile cellular technologies represented by 4G and 5G and wireless access technologies represented by Wi Fi in recent years,the data traffic of mobile network services has increased dramatically.The current data transmission technology is still dominated by TCP/UDP to realize end-to-end data transmission.However,in the future heterogeneous network environment,multi-link transmission technology with higher network resource utilization,greater throughput,and stronger disaster tolerance will inevitably replace traditional single-link transmission.At the same time,with the improvement of living standards,network users have put forward demands for multiple services.The standard TCP/IP protocol architecture does not support multipath features.This article uses network card virtualization technology to integrate multiple physical network cards into a virtual network card,which is still a network interface for network configuration and transmission to the transport layer,compatible with traditional TCP/UDP and other transport layer protocols.In order to ensure the transmission quality,the data packets to be sent evaluate each link based on the link's delay,bandwidth,overhead and other state parameters,and the link with the best state is preferentially selected for packet transmission.Multi-service is for users.The application program executed by the user has a port number corresponding to the computer.The port number information is hidden in the data packet sent by the application,and different services are distinguished by analyzing and comparing the port number field value of this data packet.This article proposes a multi-service scheduling algorithm,which divides services into real-time services and non-real-time services.The service priority is calculated according to the required bandwidth of the service,the maximum tolerable delay and packet loss rate,and user preferences.According to the service priority,the data packets to be sent are queued and waited.Combined with the selection algorithm after link state evaluation,the optimal transmission link is selected for each service data packet to realize the service scheduling function.