Abstract
Coded caching schemes with low subpacketization and small transmission rate are desirable in practice due to the requirement of low implementation complexity and efficiency of transmission. Placement delivery arrays (PDA in short) can be used to generate coded caching schemes. However, many known coded caching schemes, which have low subpacketizations, realized by PDAs do not fully use the users’ caching content to create multicasting opportunities. So we propose a method to overcome this drawback. As an application, we obtain a new scheme, which has significantly advantages on the tradeoff between memory ratio and transmission rate.
Highlights
T HE wireless networks have been imposed tremendous pressure on the data transmission during the peak traffic times due to the explosive increasing of mobile services, especially the video streaming
Coded caching schemes with low subpacketization and small transmission rate are desirable in practice due to the requirement of low implementation complexity and efficiency of transmission
A coded caching scheme, which has been recognized as an efficient solution to reduce this tremendous pressure, was proposed in [1] and has been rapidly used to in various settings such as cache-aided combination networks [2], D2D networks [3], hierarchical networks [4], insecure channel [5], among others
Summary
T HE wireless networks have been imposed tremendous pressure on the data transmission during the peak traffic times due to the explosive increasing of mobile services, especially the video streaming. Denote Zk the contents cached by user k In this phase we assume that the server does not know the users’ requests in the following phase. Delivery phase: During the peak traffic times, each user randomly requests one file from the files set W independently. The server broadcasts a coded signal (XOR of some required packets) of size Sd packets to users such that each user is able to recover its requested file with the help of its caching contents. We focus on the worst-case scenario, i.e., all the users require different files. In this case, the transmission rate of a coded caching scheme is defined as the maximal normalized transmission amount among all the requests in. Since the implementation complexity of a coded caching scheme increases along with its subpacketization level, it is desirable to design a scheme with the transmission rate and the subpacketization as small as possible
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