# US 9,521,064 B2 · Cooperative caching method and apparatus for mobile communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,521,064 B2 - Document ID: US9521064B2 - Status: Granted - Kind: B2 - Application number: 13/753,948 - Filed: 2013-01-30 - Published: 2013-08-01 - Granted: 2016-12-13 - Earliest claimed: 2012-01-30 - Assignees: Samsung Electronics Co., Ltd.; Research and Business Foundation, Korea University - Applicants: Samsung Electronics Co., Ltd.; Research and Business Foundation, Korea University - Inventors: Chulki Lee; Sangheon Pack; Janghee Lee; Sangjun Moon; Yongseok Park - Web page: https://patentgrep.com/patent/US9521064B2 ## CPC - H04W 4/18: Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals - H04L 45/00: Routing or path finding of packets in data switching networks (routing or path finding in wireless networks H04W40/00) - H04L 67/568: Storing data temporarily at an intermediate stage, e.g. caching - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A cooperative caching method and apparatus for reducing data access time and data acquisition cost in a mobile communication system are provided. The cooperative caching method of a local base station in a mobile communication system using caches of base stations cooperatively connected with each other includes determining, when a request for data is received from a client, whether the data is stored in the cache of the local base station; sending, to a home base station, upon determining that the data is not stored in the cache, a request for the data; acquiring the data from one of the home base station and a server according to whether the data is stored in the home base station; and serving the data to the client. ## Claims ### Claim 1 A cooperative caching method by a local base station in a mobile communication system, the method comprising: determining, by the local base station, if a request for data is received from a client, whether the data is stored in a cache of the local base station; transmitting, by the local base station, a message for requesting for the data, if the requested data is not stored in the cache, to a predetermined home base station to store the requested data; receiving, by the local base station the data from the predetermined home base station if the data is stored in the predetermined home base station and from a server if the data is not stored in the predetermined the home base station; transmitting, by the local base station the data to the client; and transmitting, by the local base station, the data to the predetermined home base station to store the requested data. ### Claim 2 (depends on 1) The method of claim 1, wherein transmitting the data to the client comprises: transmitting, to the client, if the data is stored in the predetermined home base station, the data received from the predetermined home base station; and storing the data in a local part of the cache. ### Claim 3 (depends on 2) The method of claim 2, wherein storing the data in the local part of the cache comprises: discarding an oldest data from the local part; and storing the data in the local part. ### Claim 4 (depends on 1) The method of claim 1, wherein transmitting the data to the client comprises: receiving, if the data is not stored in the predetermined home base station, the data from the server; transmitting, to the client, the data received from the server; and storing the data in a local part of the cache. ### Claim 5 (depends on 1) The method of claim 1, wherein transmitting the data to the predetermined home base station, comprises: transmitting, if a cooperation request is received from the predetermined home base station, the data to the home base station. ### Claim 6 A local base station for performing cooperative caching in a mobile communication system, the local base station comprising: an interface unit for communicating with at least one node connected to the local base station; a storage unit that includes a cache including a local part for storing data to be served to clients connected to the local base station and a cooperative part for storing data predetermined to be stored in the local base station and provided to the nodes; and a control unit for determining, if a request for a data is received from a client, whether the data is stored in a cache of the local base station, transmitting a message for requesting the data, if the requested data is not stored in the cache, to a predetermined home base station to store the requested data, receiving the data from the predetermined home base station if the data is stored in the predetermined home base station, and from a server if the data is not stored in the predetermined home base station, transmitting the data to the client, and transmitting the data to the predetermined home base station to store the requested data. ### Claim 7 (depends on 6) The local base station of claim 6, wherein the control unit controls transmitting, to the client, if the data is stored in the predetermined home base station, the data received from the predetermined home base station and storing the data in the local part of the cache. ### Claim 8 (depends on 7) The local base station of claim 7, wherein the control unit controls discarding of an oldest data from the local part and storing the data in the local part. ### Claim 9 (depends on 6) The local base station of claim 6, wherein the control unit controls receiving, if the data is not stored in the predetermined home base station, the data from the server, transmitting, to the client, the data received from the server, and storing the data in the local part of the cache. ### Claim 10 (depends on 6) The local base station of claim 6, wherein the control unit controls transmitting, if a cooperation request is received from the predetermined home base station, the data to the home base station.