Research On Key Technologies Of Cross-layer Design Of Instantaneous Spectrum Access Protocol

This dissertation proposes a fast channel access protocol: the instantaneous spectrum access protocol,abbreviated as ISA in following.The protocol tries to realize the instantaneous access channel of each node in a similar swarm fighting system network environment,and improve spectrum utilization,send and receive information at any time,ensure the maximum throughput of the network based on the OSA design idea.The basic principle adopted by the swarm fighting system combat scene is the decentralization of a large number of low-cost unmanned weapons to achieve widespread occupation of enemy areas.During the implementation process,the swarm fighting system needs to exchange information such as environment,tactics and coordination continuously,and the communication volume is huge.How to make the swarm fighting drones can effectively access the network under the shared spectrum conditions,maintains the fairness of channel access and realizes data distribution at any time without interfering with parallel communication or weak interference to parallel communication without affecting its substantive communication effect is a challenging problem.This dissertation mainly studies several key technologies involved in the cross-layer design of the instantaneous spectrum access protocol,as follows:First,a multi-channel sensing scheme combining cooperative and non-cooperative sensing design ideas is proposed.In the traditional channel sensing scheme,there is a problem that the network load of the cooperative sensing mechanism is high,and the accuracy of the noncooperative sensing mechanism is low.In this dissertation,a multi-channel sensing scheme combining cooperative and non-cooperative sensing design ideas is proposed.Multiple probe points are deployed on the network node to jointly detect a one-hop spatial channel situation around itself,and the detection result is fused at the node and finally forms a complete channel sensing result,and based on the result,the torque lever strategy is used to identify the occupied Spectrum,thereby obtaining idle spectrum resources.The scheme overcomes the technical difficulties of single-node narrow channel sensing in the past,and does not have the communication load problem of wide channel cooperative detection,and has the characteristics of strong timeliness and high accuracy.Secondly,based on the cross-layer design idea of the system,the communication guarantee mechanism of the instantaneous spectrum access protocol is studied.The instantaneous spectrum access protocol allows multiple information to be transmitted in parallel.Therefore,the physical layer communication system adopts a Single Input Multiple Output system(SIMO)to combat non-cooperative interference of the system and obtain the spatial diversity gain of the receiving end.In addition,in order to reduce the retransmission load caused by the channel collision in the instantaneous spectrum access protocol network,system physical layer channel coding adopts two-layer cascade coding,which relies on strong secondary error correction capability of error correction coding,and the spatial diversity gain of the SIMO system to ensure the ability of the system to transmit multiple information in parallel.Thirdly,a non-cooperative backoff strategy based on Nash equilibrium is proposed.The instantaneous spectrum access protocol constructively adopts the Quality of Service(QOS)as the constraint condition,and the Nash equilibrium strategy is used as a strategy mode trainer.The network node can form a fixed backoff selection only after a limited number of iterative collision training mode,in which each object takes measures against other objects in the system,and accordingly adopts the selection result that is most beneficial to oneself,which has the characteristics of small calculation amount,fast convergence rate,and does not easily change once the mode is fixed.Fourthly,the problem of spectrum resource selection in the design of instantaneous spectrum access protocol is studied.With the system throughput as the constraint condition,the spectrum resource of the model estimation system is established,and the waste of resources is avoided under the premise of satisfying the communication.At the end of the dissertation,the instantaneous spectrum access protocol and the Statistical Priority based Multiple Access protocol(SPMA)adopted in the US military Tactical Targeting Network Technology(TTNT)are compared,both of which are based on channel statistics to determine the channel access.However,there are differences in the specific design details between them.This dissertation adopts the overall cross-layer design idea combined with the physical layer,focuses on the realization of the instantaneous spectrum access protocol,and finally compares the core parameters with the Statistical Priority based Multiple Access protocol to verify that the instantaneous spectrum access protocol has good performance.