A Study on Online Cooperative Caching in Wireless Networks

• Main Authors: Yen, Chen-Tai, 顏辰泰
• Other Authors: Chien, Feng-Tsun
• Format: Others
• Language: en_US
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/kxbdqr

碩士 === 國立交通大學 === 電子研究所 === 106 === In this thesis, we study a delay-aware cooperative online content caching mechanism in wireless networks with limited caching space in each base station (BS) and unknown popularity of the contents. An online algorithm is proposed for cooperative caching in multi-BS coordinated systems that does not require any knowledge of the contents popularities. When a new request from a user arrives at a BS, the BS responds the request by direct delivery if the requested content is currently cached in its storage space; otherwise, the BS sends a message to the Mobility Management Entity (MME) to initiate the online content caching mechanism. The proposed cooperative online content caching algorithm (COCA) then decides in which BS the requested content should be cached with considerations of three important factors: the residual cache storage space in each BS, the number of coordinated connections each BS is involved with other BSs, and the number of served users in each BS. In addition, due to limited storage space in the cache, the proposed COCA algorithm eliminates the least recently used (LRU) contents to free up the space.