Research On Power Control Under The Service Priority Constraint In MANET

Mobile Ad Hoc Networks(MANET)is a completely distributed network with no center and self-organization,which is mainly used in military,emergency rescue and other Mobile scenarios.In the network,there are services with high delay requirements(such as advanced instructions,emergency emergencies,etc.),which require the network to provide QoS guarantee to meet the requirements of real-time service transmission.In view of the above problems,this paper studies the power control under the constraint of strong business priority of MANET.Through the power adaptive adjustment,important data can be timely and accurately transmitted to the destination,providing effective service quality support for emergency emergencies.The main contents are as follows:Firstly,a distributed priority-based single channel MAC power control protocol is proposed to determine the transmitted power of nodes in the network and realize adaptive power adjustment.(1)data are assigned different priority in the source node,and the intermediate node processes data according to the priority of data,so as to ensure the priority transmission of high-priority data.(2)add power information in the control frame,determine the transmitting power of data through the exchange of power information between nodes,and realize the power adaptive adjustment.It enables high-priority data to obtain higher emission power permission,improves the signal to noise ratio,guarantees the efficient and reliable transmission of data,reduces the number of hops,and reduces the time delay.The distribution of interference limit power reduces interference and improves the multiplexing of channel space.Low priority series send data with the minimum effective power,reserving resources for high priority data,reducing interference and energy consumption.Experimental simulation shows that,under high network load,high priority service performance is significantly better than other protocols.Compared with the two power control protocols based on throughput and energy consumption(IAPCM and PCM),time delay is reduced by 18% and 43% respectively,and packet delivery rate is increased by 10% and 18% respectively.Secondly,Proposed QoS routing protocol under MAC layer power control mechanism,optimized transmission path,and improved network service quality.Based on the power information,the power limited by node interference is used as the transmitting power of the routing control frame to establish the network topology.With the constraints of delay,bandwidth and hop number,the route with the highest QoS compliance is selected to transmit data by using mixed routing metrics.And the route prerepair mechanism is adopted to timely pre-repair the links with poor service quality,thus reducing the delay and routing discovery frequency.The simulation results show that,compared with the single MAC layer power control,when the network load is high,the delay of high-priority service is reduced by about 14%,the packet delivery rate is increased by 17%,and the performance of lowpriority service delay,delay jitter and packet loss rate are also significantly improved.In the mobile scenario,compared with IAPCM and PCM power control protocols,high priority service delay,delay jitter,packet loss rate and other performance has obvious advantages.The above research results in this paper can provide effective support for real-time processing of urgent and important services in mobile Ad Hoc network,which is of great significance in practical application.