An Effectively Prefetching Policy for Location Based Services

• Main Authors: Sheng-Shiung Yang, 楊勝雄
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/13719228397347727827

碩士 === 東吳大學 === 資訊科學系 === 95 === With the growth of the mobile communication, location-dependent information services (LDISs) becomes increasingly popular. LDISs provide users location dependent data (LDD) according to where they are such as information of traffic flow, restaurants and so on. These services give them much convenience. However, to access the latest and plenty information of the remote server through mobile network can cause the latency of information retrieval due to the bandwidth of mobile networks and the quality of communication. This could decrease the effectiveness of the service. It’s well-known that the technology of caching and prefetching can reduce the information retrieval time. We propose the user mobility mode and take advantage of the method of prediction by partial match to dynamically construct the prefetching architecture based on users’ past moving history and tend to predict the next user’s mobility mode by prefetching architecture we construct. If wrong predicting happens, we adjust prefetching according to user’s moving behavior so as to increase the effective and efficiency of the prefetching. At the same we also improve the usefulness of the location-dependent information services.