Research On Statistical Priority-based Multiple Access Protocol

Low latency and high reliability are important trends in the development of wireless communications.The new-generation data link system,Tactical Target Network Technology(TTNT),and the fifth-generation mobile communication network all have higher requirements for low latency and high reliability.Traditional media access protocols can no longer meet the quality requirements for certain high-precision services in the diversified business data.The statistical priority-based multiple access protocol(SPMA)based on statistical priority can apply to these systems with its excellent performance.Compared with the traditional link-layer media access protocol,the SPMA protocol can provide different QoS for different services.It provides high-priority services with ultra-high successful transmission probability and ultra-low access delay.However,the research on SPMA protocol model description,performance analysis,and protocol optimization is still not comprehensive.In the Ad Hoc network,this paper uses the Markov renewal process to model the communication nodes,and the performance of the SPMA protocol is theoretically analyzed.By constructing a fixed point equation,we obtain the medium access probability of the SPMA protocol.And the theoretical expressions of successful packet transmission probability,throughput,and access delay are further deduced.The simulation results show that the theoretical error of the model proposed in this paper is small.It provides a new idea for understanding the working principle of the SPMA system.The main results obtained are as follows:1.This paper summarizes and proposes an SPMA protocol system model from the existing literature,establishes a discrete-time Markov update process analysis framework for communication nodes in the network,and proposes a fixed point equation to calculate the SPMA protocol in a saturated network Performance.A discrete-time Markov update process is established according to the different states of the node and the sojourn time of each state.The specific expressions of media access probability,successful packet transmission probability,throughput,and delay deduce in detail.The influence of network parameters on protocol performance is discussed based on this.We use Matlab simulation software to perform theoretical and protocol simulations to verify the theoretical analysis results.The simulation results show that the simulation model proposed by us has small errors and is suitable for analyzing the SPMA protocol.Under the condition of frequency-hopping,the success rate can not achieve the 99% success rate requirement.Only under the condition of both frequency-hopping and time-hopping,can the SPMA protocol's requirements for high success rate and low delay be met.2.In the same priority and differentiated priority systems,the performance is different.Under the condition of multi-priority,SPMA can provide different QoS for multiple priority packets by setting parameters in the system.The simulation results show that the channel access threshold determines the performance of multiple priorities.Besides,the length of the initial back-off window and the number of packet split bursts also have a certain impact on the performance of different priorities.Moreover,under the premise of a certain loss of low-priority packet performance,the performance of high-priority services and the overall throughput are improved.3.This paper proposes an SPMA protocol system model by summarizing the existing literature and establishes an analytical framework of the discrete-time Markov renewal process for the communication nodes in the network.We propose a fixed point equation to calculate the performance of the SPMA protocol under saturated networks.The specific expressions of the medium access probability,the average packet success rate,the average delay,and system throughput are deduced.Based on this,we discuss the influence of network parameters on the performance of the protocol.We use Matlab simulation software to verify the theoretical analysis results.The simulation results show that the model proposed by us has small errors and is suitable for analyzing the SPMA protocol.In the single-prioritized and multi-prioritized systems,the performance is different.It shows that SPMA can indeed provide different QoS for multiple priority packets.4.We designed the SPMA protocol scheme based on a QoS guarantee.It ensures that high-priority packets are served first,and the probability of packet success rate is above99%.Based on this,the low priority threshold is dynamically determined to achieve the goal of improving system fairness and increasing system throughput.The simulation results show that compared with the fixed threshold scheme,the scheme based on the QoS guarantee can improve the system throughput.