【摘要】 在移动P2P网络环境中能量有效数据查询是一个基本应用问题。现有研究只关注数据广播,没有考虑到移动主机有限的资源,还没有研究在数据广播和索引中考虑查询节点位置特性和时间特性。文中提出了基于最小边界矩形的分布式空间索引(DMBR)结构,设计了一种有选择的监听广播信道的查询算法。所有提出的新算法机能最小化通信开销,减少访问时间,提高查询效率,移动客户机电量,节省能量消耗。仿真结果表明DMBR索引结构的查询算法范围查询、访问时间和能力消耗方面具有更好的性能。更多还原

【Abstract】 In mobile peer-to-peer( P2P) networks energy efficient data query processing is a fundamental problem for applications. However,the current studies do not take into account the limited resources of the mobile hosts,only address the dissemination of data items via wireless broadcast.Moreover,none of them considers location-based and time-base data dissemination and index for mobile P2 P environments. This paper proposes a distributed minimum boundary rectangle( DMBR) which is a new spatial index specifically designed for mobile P2 P environments. We propose a query processing new query processing with the DMBR index algorithm which can immediately begin to query and quickly repair query interrupted. The proposed algorithm can minimize communication costs,reduce the access time,improve query efficiency, conserve energy consumption in mobile P2 P environments. The simulation results show that proposed query algorithm with DMBR index and have offers better performance in terms of access time,energy consumption in range queries.更多还原