Research On Two Types Of Coded Caching Schemes

With the popularity of electronic equipment,the request and signal transmission stage of network resources will cause large system delay and network load.How to reduce the transmission pressure during the peak period has become an urgent problem to be solved,and cache technology is just the most effective way to slow down network congestion.In 2014,Maddah-Ali and Niesen proposed a new coding cache scheme,which mainly includes two aspects:the off-peak placement phase and the peak delivery phas.In order to better study the design of coding cache scheme,Yan Qifa and others put forward the placement delivery array in 2016,and introduced the corresponding relationship between the coding cache scheme and the placement delivery array(PDA).Therefore,the problem of designing a coding cache scheme can be transformed into the problem of constructing a suitable place-ment delivery array.And Maddah-Ali and Niesen's scheme is also a special case of placement delivery array scheme.In this paper,a class of coding cache scheme is designed based on the maximum distance separable(MDS)code and its coded gains is analyzed.Secondly,a better performance coding cache scheme can be obtained by transposition of the original coding cache scheme to the array in the scheme.Finally,a class of coding cache scheme is designed and constructed.Compared with the existing scheme,the proposed scheme has some advantages under some parameters.