Performance Analysis Of Non-cooperative Random Multiple Access Protocols With Short Packet Transmission

As an important application scenario of 5G and next-generation communication,machine to machine(M2M)communication mainly provides communication for Io T access terminals and a large number of sensors in control systems.M2 M communication has been widely used in various industries such as smart city,smart Home and smart transportation,which improves people’s quality of life and is of great significance to the national economy and human life.With the development of wireless communication technology,more and more machine-type communication terminals are beginning to access the network,how to improve the utilization efficiency of wireless spectrum resources for M2 M communication and support more terminal devices to access network efficiently is a problem which need to be solved.Non-cooperative random multiple access protocols has no cooperation between devices,which has no communication resource consumed by signaling interaction and is easy to implement.Thus,non-cooperative random multiple access protocols is one of the important technologies for realizing efficient M2 M communication in the future,which has attracted many scholars’ research in recent years.Short packet transmission is an important feature of M2 M communication,so the research on non-cooperative random multiple access protocols with short packet transmission is of great value to the future development of M2 M communication.This paper combines the characteristics of short packet transmission for M2 M communication scenarios and conducts the following researches on non-cooperative random multiple access protocols:(1)For the problem that existing non-cooperative random multiple access technologies with short packet transmission have the high packet error probability which cannot guarantee the system performance of short packet transmission: The concept of short packet decoding threshold is proposed,which is the signal-to-noise ratio when the short packet error probability(PEP)reaches the tolerable maximum packet PEP by the system for the fixed coding rate and packet length.In addition,the analytical formula of short packet decoding threshold for additive white gaussian noise(AWGN)is further derived.In practice,according to the short packet decoding threshold,the short packet PEP of non-cooperative random multiple access can be controlled within the acceptable range by power control to ensure the performance of the communication system.Further,aiming at the problem of low spectrum efficiency for existing ALOHA with short packet transmissions: a distributed power control scheme with intra-slot successive interference cancellation(SIC)support has been proposed based on the short packet decoding threshold,which can support ALOHA to implement two-packet reception.At the same time,an ALOHA performance analysis model for short packet transmission is established under the distributed power control which can support intra-slot SIC two-packet reception.The system performance optimization problem was transformed into a convex problem for solving,which maximized the system throughput and improved the spectrum efficiency of ALOHA with short packet transmission.(2)For the problem that the distributed power control scheme which supporting multi-packet reception in the existing non-cooperative random multiple access technologies has low successfully decoding probability for collided packets: A multi-power-level distributed power control scheme that supports intra-slot SIC multi-packet reception is proposed,which can improve successfully decoding probability of collided packets.Further,aiming at the problem of high packet PEP for the short packet transmission caused by the transmission power set design of the existing distributed power control ignoring the consideration of packet length: Based on short packet decoding threshold,the transmission power set expression of multi-power-level distributed power control is derived,which can accurately describe the required transmission power set for packet parallel transmission under different packet lengths and control PEP of the short packet within the tolerable range of the system to ensure the short packet transmission communication system performance with multipacket reception.At the same time,the lower limit closed analytic formula of successfully decoding probability for collided short packets is derived and then it is proved that the derived lower limit closed analytic formula can accurately describe the decoding probability of short packets for multi-packet reception distributed power control by simulation.Finally,a short packet transmission IRSA performance analysis model for multi-packet reception is established,which can accurately describe the IRSA performance of short packet transmission under different packet lengths and packet error probabilities.Meanwhile,the differential evolution algorithm is used to optimize the probability distribution of packet transmission times of the sender to maximize the system performance,which improves the spectrum utilization efficiency of multi-packet reception IRSA with short packet transmission.(3)For the problem of the limitation of the existing performance analysis for short packet transmission under fading channels: The PEP analysis for two-collision short packet decoding under Rayleigh fading channel is extended to the PEP analysis for multi-collision short packet decoding.Then,the analytical formula for PEP of multi-collision short packet decoding based on intra-slot SIC under Rayleigh fading channel is derived,which is more universal for short packet transmission performance analysis as well as providing theoretical support for the performance analysis and optimization of multi-packet reception noncooperative random multiple access protocols with short packet transmission under fading channels.Further,aiming at the problem of low spectrum utilization efficiency of IRSA with short packet transmission under fading channels,an intra-slot SIC based multi-packet reception scheme is proposed to decode the collided short packets by using the transmission power difference resulting from the different communication environments of different transmission packets,which further improves the spectrum utilization efficiency of IRSA with short packet transmission under fading channels.