Research On Coding-Aware Routing Technology Of Wireless Communication Physical Layer Networks

Space-air-ground integration networks(SAGIN)break through space constraints,be flexible in networking,and be adapt to complex network environments,which endow it the research hot spot of 6G communication technology.But it is faced with poor adaptability to time-varying networks,high network congestion rate,large information latency,and low link utilization.Therefore,a wireless physical-layer network coding aware routing under multi-stream interference is studied to combat the above problems.First,the background,research significance,and current status of the SAGIN are introduced.Then,the principles and development status of network coding,and coding aware routing technology used in SAGIN are introduced.Third,there is a multi-stream interference in coding aware routing based on single-hop coding structure with listening(SCS-W).The multi-stream interference resistant coding aware network routing and load balancing method are proposed.Finally,coding aware routing has problems about poor metrics applicability and sub-optimal spatial location routing,the physical-layer coding aware routing metric design and optimal spatial routing are proposed.The main content and contributions of this thesis are concluded and listed as follows:1.To solve the multi-stream interference in code aware routing in SAGIN,the code aware routing and against multi-stream interference is proposed.First,the spatial location information of the route is collected by the node through two stages of routing request and routing response,Then,route is stored in the standby routing pool during the awareness phase,it is retrieved by a decoding failure node.Finally,a route of spatial location d satisfies one hop is selected as a relay node,it provides decoding information to decoding failed nodes and completes decoding,eliminating multi-stream interference.Simulation results indicated that the algorithm in this paper outperforms coding opportunity entity(COPE)by approximately 6% in signal-to-noise ratio(SNR)of 10 d B,the problem of multi-stream interference is alleviated in the SAGIN.2.To overcome the limitation of high node congestion in coding aware routing in SAGIN,Coding-aware routing network load balancing is proposed.The transmission link aggregate F is transmitted to surrounding nodes along with network status information,when the bottleneck node load is greater than the load threshold.Then,the surrounding nodes divert the data flow through the node in F,alleviating the load on bottleneck routing node.Simulation results indicated that the algorithm in this paper compared to COPE and lowest delay direct transmission scheme,the end-to-end average delay of this scheme decreases by 0.03 ms and 0.02 ms in the date flow reaches50,it can alleviate current route congestion.3.To solve the problem of lack of suitable routing metrics and optimal relay node selection for physical-layer coding aware routing.Therefore,the physical-layer coding aware routing metric design and optimal relay node selection algorithms are proposed.The performance index of information transmission in the physical-layer for coding aware routing is bit error ratio(BER).Therefore,a physical-layer coding aware routing metric based on BER is designed based on the minimum BER that successfully decodes the information as the BER threshold.To solve the problem of selecting optimal routing nodes for physical-layer coding aware routing,the influence of parameters on outage probability in information transmission is analyzed,theoretical derivation shows that there is a relationship between the outage probability and the routing node location d and get the theoretical value.When the relay node position projection is located between the source node and the destination node,the system achieves optimal performance.Finally,simulation results indicated that this scheme reduces expected transmissions count metric by 0.25 compared to COPE in the SNR of 10 d B,it reduces the number of successful network information delivery transmissions,and improves system throughput.By optimization and improvement of coding aware routing protocols and routing metrics,this thesis contributes to solved the multi-stream interference,high node congestion rate,small application range of routing metrics,and optimal routing space selection on wireless multi-stream environments.And it has better improved the comprehensive performance of the SAGIN.Therefore,it can be applied to the coding-aware routing in next generation space network systems.