Abstract: Most researches on mobile video communication(MVC) focus on audio and video synchronization,bit rate adjustment and energy saving,however,the change between APs which leads video communication service to interruption is not considered.We proposed a cloudlet-based mobile video prefetching system(CMVP) to this challenge.CMVP utilizes cloudlets to prefetch video streams for mobile-phones.We designed a greedy prefetching algorithm to reduce the count of service interruption as far as possible.And to balance cloudlets’ resource consumption,the low probability K to 1 markov prefetching progress schedule algorithm(LPMPPS) and first AP selection algorithm were designed.Our simulation results demonstrate that CMVP can access to more than 90% hit rate,and QoE can be improved remarkably.

Key words: Public AP,Video prefetching,Cloudlets,K to 1 Markov