Abstract: According to multiple services in the dynamic networks,this paper proposed a new backoff scheme,which uses probability judgement based on network load and adaptive service distinguishing backoff (PJNL_ASDB) scheme that can judge network status with Probability mechanism and use adaptive dynamic backoff scheme to distinguish servi-ce by introducing weighting parameter,thus it can implement reasonable backoff.The numerical results of two-dimensional discrete-time Markov chains model and NS2 simulation show that the PJNL_ASDB scheme can not only ensure the demand of high priority transmission but also improve the network performance of low priority.

Key words: Dynamic networks,Service distinguishing,Probability judgement,Markov chains