| In recent years,medical health monitoring of human Body is in high demand,and Wireless Body Area Networks(WBANs)as an effective means has been widely concerned.Compared with traditional Wireless Sensor Networks(WSNS),wireless body area networks need to consider the influence of network energy and link heterogeneity.In the case of limited node energy,how to improve energy efficiency,control network energy consumption and improve network Quality of Service(QoS)has become a research hotspot in this field.Based on the systematic study and summary of the existing WSN and WBAN routing protocols,it is found that the clustering routing algorithm is helpful to realize the energy efficiency optimization under the condition of network heterogeneity.Therefore,a node mobility model of heterogeneous WBAN is established,and two WBAN energy efficiency clustering routing protocol are designed for the static model with heterogeneous energy and the mobility model with heterogeneous link,respectively.The main contents and innovative results of this thesis include:(1)For routing problems in WBAN networks with heterogeneous energy,a Local Energy Equilibrium Game Clustering with Penalty(LEEGCP)is proposed.Based on non-cooperative game theory,a benefit function model related to node residual energy is constructed.The temporary cluster heads are selected according to the probability of the mixed strategy Nash equilibrium,and the final cluster heads are selected through multiple rounds of iteration.The experimental results show that the proposed protocol achieves good performance in energy balance,prolongs the network life,and can be used in wireless body area networks with heterogeneous energy.(2)For modeling problems for WBAN networks with heterogeneous mobility characteristics,a WBAN mobility model with heterogeneous links is proposed,which integrates human body mobility model and human body channel model.Based on ad hoc network model,the WBAN mobility model which conforms to the characteristics of group movement and movement of human body is constructed.Considering the different channel conditions of line-of-sight and non-line-of-sight,the path loss and channel quality of WBAN are modeled accurately.Finally,combined with the above two models,a WBAN mobile model of link heterogeneity is established,which provides a more detailed basis for the subsequent routing protocol design.(3)According to the characteristics of WBAN heterogeneous mobility model,a dynamic link quality adaptive energy-efficient clustering routing protocol is proposed.Based on network information such as residual energy,signal strength of neighborhood links and node degree,this protocol constructs a new game model to solve Nash equilibrium and realize cluster head election.When calculating the game factor,the node degree of cluster head is considered to fit the mobility characteristics,and the expected transmission times are accurately predicted according to the path loss condition to fit the link heterogeneous characteristics.The new game model makes the nodes with low energy consumption burden and low recurrence times have more chances to become temporary cluster heads.In addition,the iterative election mechanism is redesigned and verified.The simulation results show that the network life of this algorithm is prolonged,while the packet delivered rate is increased stably,the amount of data sink received is increased,and the QoS performance is obviously enhanced. |
