Adjusted Replica Allocation in Ad Hoc Networks for Improving Data Accessibility

In ad hoc networks, disconnections occur frequently. In this paper, we allocate the data replicas according to time and space. In temporal method, we store the original data, the median data in a specific time period and the replica with the second highest frequency among all the other data on the mobile hosts to improve data accessibility. In spatial method, we store the original data, the median data among all the neighbors and the replica with the second highest frequency. The advantages of storing the median data are for fault tolerance to eliminate the outliers so that we can get more accurate information of a specific time period or a region, to save memory spaces and energy of the mobile hosts.