Research On Resource Allocation Algorithm Of Air-to-Ground Communication System

In recent years,with the increase of the number of aircraft passengers and the in-depth development of various intelligent terminals and mobile services,the demand for aviation communications has increased sharply,at the same time,the opening of the Internet on board has eased communication problems for passengers during flight.The air-to-ground communication system mainly carries three businesses,the Air Traffic Service(ATS)and Aeronautical Operational Control(AOC)which guarantee normal communication in the front cabin,and Aeronautical Passenger Communications(APC)business guarantee communication in the rear cabin.ATS and AOC services are related to the safety of aircraft operation,with low communication traffic and low network delay requirements.They should be given priority in the resource allocation process.The APC services are designed to meet passenger communication requirements,with high communication traffic,and have different Qo S requirements for handover nodes and new call nodes.Under the circumstance that the bandwidth resources available for air-to-ground communication are extremely limited,the traditional resource allocation algorithm that mainly solves the voice service transmission in the front cabin can no longer meet the current communication system with multi-service transmission and multi-Qo S requirements.Therefore,this paper combines the project " Development and Testing of Prototype of Ground-to-Air Broadband Data Link Communication System " to address how to use limited spectrum resources to meet the communication needs of different mobile nodes in air passenger communication systems on the premise of ensuring the safe operation of aircraft,and to seek efficient and stable transmission of multi-service data streams in ground-to-air communication systems,the following studies have been conducted:(1)Aiming at the resource allocation problem in the air passenger communication system,firstly,in the coverage area of the ground base station,in order to ensure the call drop rate of the switching nodes,by analyzing the communication needs of two types nodes,combining ARMA prediction model and node traffic model,a resource allocation algorithm with bandwidth constraints and transmission rate constraints is proposed,which can effectively reduce the call drop rate of handover nodes.At the same time,an optimized resource allocation model is designed.This algorithm can improve the system throughput and bring passengers a better communication experience while meeting the Qo S requirements of mobile nodes.The simulation results show that the proposed algorithm greatly reduces the call drop rate and the Go S,while maintaining a high level of system throughput,which can guarantee the provision of communication demand services for multiple users.(2)Aiming at the problem of multi-services resource allocation in air-to-ground communication systems,this paper analyzes and models the three services,and proposes resource allocation strategies when the bandwidth resources are insufficient and sufficient.When the bandwidth resources are insufficient,ATS and AOC which are related to aircraft safety are mainly transmitted,and a utility function-based allocation algorithm is proposed to maximize the average waiting delay of AOC total utility.When the bandwidth resources are sufficient,the paper proposes an optimization goal to maximize system transmission rate,and design related Qo S constraints for the operational services represented by ATS and non-operational services of APC,study subcarriers and power allocation strategies in a queuing network on a long-term scale.The simulation results show that the proposed two algorithms can effectively reduce the delay of service queuing,improve the system throughput,improve the fairness of resource allocation between services,and meet the requirements of aviation communications.