Research On Key Technology Of Multi-Service Traffic Resource Allocation In Cross-Modal Communications Network

The development of 5G communication technology has brought more diversified service options to people,which makes it possible to transmit tactile data,a service data with high requirements for time delay.The cross-modal communications system,which integrates visual,auditory,and tactile service data,provides people with more realistic and rich multimedia experiences through the introduction of multiple modal data.In the transmission,the video service has a large amount of data as well as requiring a high transmission rate,while the tactile service pays more attention to transmission delay and emerges with suddenness and randomness.The differences in transmission requirements make the two types of service data conflicting in terms of wireless resource allocation.It is necessary to allocate wireless resources for video and tactile service data in an effective way,so as to realize the joint transmission of the two types of service data and the reasonable utilization of resources in the cross-modal communications system.In this thesis,the joint resource scheduling of two types of service data,video and tactile,in cross-modal communications system is studied,and the work of this thesis mainly includes the following two parts:(1)To address the resource scheduling problem caused by the difference in data transmission requirements of two services in the system,this thesis proposes a resource scheduling scheme based on puncturing architecture and network slicing to achieve flexible resource allocation and efficient resource utilization while realizing the joint transmission of data of the two services.In order to reduce the negative impact of puncturing resource occupation on user video data transmission,optimization problems related to transmission rate and reliability are constructed.At the same time,the influence of two puncturing resource allocation methods,occupy resources proportionally and occupy resources by resource block,on user video data transmission is discussed.The simulation results show that the propose scheme has advantages in realizing the joint transmission of video and tactile services data in cross-modal communications system.(2)For the problem of excessive band resource occupation and large tactile packet loss rate caused by a large number of tactile packet arrivals in the puncturing architecture,this thesis proposes a joint resource scheduling scheme based on the M/M/1 queuing model.On the basis of the puncturing architecture,M/M/1 queuing model is introduced to queue the arriving tactile data packets,and implement the first-come,first-served strategy.The tactile data packets that exceed the capacity of the current mini-timeslot are placed in the queue and then transmitted in the subsequent mini-timeslot,so as to reduce the packet loss rate of tactile data packets.Starting from the transmission requirements of the two types of service data,appropriate quality of service(QoS)indexes are established respectively,and an optimization problem aiming at maximizing the QoS of the two service data is constructed.The Deep Deterministic Policy Gradient(DDPG)algorithm is used for joint optimization of video data and haptic data transmission resources to maximize QoS metrics.And the Jain fairness index is applied to evaluate the fairness of resource scheduling scheme.The simulation results demonstrate that the proposed scheme outperforms the compared scheme in fairness,effectiveness,and transmission reliability.