基于缓冲Cell的用户迁移方法研究  

An Avatar Migration Mechanism Based on Cell Buffer

作　　者：周忠[1,2] 王少峰[1,2] 吴威[1,2] 

机构地区：[1]虚拟现实技术与系统国家重点实验室(北京航空航天大学),北京100083 [2]北京航空航天大学计算机科学与技术学院,北京100083

出　　处：《计算机研究与发展》2008年第10期1654-1661,共8页Journal of Computer Research and Development

基　　金：国家"八六三"高技术研究发展计划基金项目(2006AA01Z331);国家自然科学基金项目(60603084)~~

摘　　要：分布式虚拟环境中现有的用户迁移方法主要基于固定缓冲区,而近年研究热点的多服务器结构采用动态缓冲区,服务器区域调整中受影响的用户不能进行迁移,影响了交互性和效率.提出一种基于缓冲Cell的用户迁移方法,将缓冲区用一组Cell来表示,将用户替身运动和区域调整引起的迁移抽象为4项状态迁移条件.根据用户和所属Cell的状态变化,触发用户状态迁移,多个用户可并发高效地完成迁移.实验表明,这种用户迁移方法可有效支持用户的并发迁移,并具有较低的通信附加负载.Avatar migration which changes the resident server of an avatar is an important issue in distributed virtual environment. Existing methods for multi-server DVE （distributed virtual environment） systems mainly conduct avatar migration according to the relationship between the avatar＇s movement and servers＇ region buffer, and the region buffers are fixed. However, regions are often regulated to balance the load in the latest multi-server DVE technologies. Then affected avatars have to migrate during the period of region regulation. This avatar migration of dynamic region buffer needs further study. An avatar migration mechanism based on cell buffer is proposed in this paper, where each region buffer is composed of a group of cells. Both cell and avatar are assigned to some status. Avatar migration is induced by two kinds, either avatar movement or region regulation. The mechanism abstracts the two kinds into a process of four critical conditions of status migration. Migration operations are devised on the status of avatar and the cell it resides on. In this way, many avatars can migrate concurrently with efficiency. The attribute update request of an avatar is only put in its region server＇s charge, which guarantees the status consistency. Experiments show that the mechanism can support concurrent migration efficiently, adding a low communication cost.

关 键 词：分布式虚拟环境 多服务器 用户迁移 缓冲区 感兴趣区域 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]