关键词: 移动网络环境，位置更新，断连检测，断连处理

Abstract: New algorithms were proposed in this paper based on the segment-based policy, in order to detect disconnection in mobile computing environment and update location efficiently. First algorithm uses fix-time policy, can detect disconnection quickly and efficiently, but cause more numbers of location updates. Second algorithm uses adaptive time limit policy and finds a good balance. At last group-based policy will be modified to detect and deal with disconnection. Our experiments show that these algorithms not only decrease numbers of location updates,but also can detect network disconnection efficiently.

Key words: Mobile computing environment, Location update, Disconnection detection, Disconnection handling