Research On Congestion Optimization Of MTC Equipment Based On Preamble Resource Allocation Algorithm

In recent years,Machine-Type Communication(MTC)has played an increasingly prominent role in the Internet of Things(Io T).Due to the large number of devices,small amount of data,and wide coverage,MTC devices have been widely used in smart homes,multi-channel conferences,telemedicine,etc.challenge.When a large number of MTCDs access the network at the same time,devices will collide,resulting in a sharp increase in access delay,resulting in a large number of device access failures.For the optimization of preamble resource allocation,this paper proposes a preamble resource allocation scheme based on the delay sensitivity of different devices;for the problem of insufficient uplink resources in MTC,a preamble multiplexing based on spatial grouping is proposed.Program.The main research contents are as follows:Based on the massive deployment and delay sensitivity of devices in the large-scale Internet of Things,a random access scheme based on delay sensitivity is designed.Markov process is used to optimize the backoff scheme for delay insensitive devices;according to different The system congestion level optimizes the ACB factor,and improves the traditional ACB(Acess Class Baring,access class barring)method to a static preamble allocation algorithm based on different delay sensitivities.Aiming at the problem of uneven allocation of preamble resources exposed by static methods,which leads to the decline of resource utilization,a joint optimization algorithm based on dynamic ACB and the optimal number of preambles is proposed.level,the corresponding preamble resources are dynamically allocated.The simulation results show that the method can effectively solve the problem of network congestion and improve the throughput and resource utilization efficiency of the network.The preamble multiplexing problem based on relay forwarding access scenario is studied.First,this paper constructs an access model based on relay forwarding,that is,each general MTC equipment(General MTC equipment,GME)sends an access application to an e NB(evolved Node B,LTE base station)first to a machine type communication gateway.,called Spatial packet relay(SPR)transmission,one SPR and multiple GMEs it serves constitute a spatial packet,and the SPR acts as the relay of the spatial group where the GME is located and then forwards the data to the base station.Using the spatial isolation generated by GMEs nd SPRs in different spatial groups,GMEs with spatial isolation from each other are divided into a multiplexing group(Multiplexing group,MG),and the devices in the multiplexing group can implement preamble multiplexing.To sum up,the idea of the preamble multiplexing scheme in this paper is: let the two-stage transmission without interference multiplex the same resource to improve the resource utilization efficiency.By simulating the proposed scheme and comparing with the existing resource allocation schemes,the proposed scheme can greatly improve the communication satisfaction of GME in the system and the resource utilization rate of the system.