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普适计算环境的多样性、动态性和自主性对服务发现协议的适应性提出更高要求.传统服务发现协议中1)角色系统施加于设备的固定的功能集合和封闭的交互规则,以及2)对底层网络特性的两难假设阻碍了服务发现协议对环境中多样和动态的设备能力、连接方式和用户意图的适应;3)源自用户的自主性使得设备缺乏维护协议中交互规则的内在动机.提出基于能力(Ability)和策略(Policy)驱动的AP模型解决第一个问题;引入虚拟网络(Virtual Network)和组(Group)机制解决第二个问题,得到可适应的VGAP框架;基于市场机制建立Market模型解决VGAP中策略的自动选择这一分布式约束优化问题及第三个问题,得到自适应的服务发现模式VGMAP.原型系统和定量实验验证了VGMAP模式的自适应性.
The diversity, dynamism and autonomy of ubiquitous computing environments place higher demands on the suitability of service discovery protocols.Traditional service discovery protocols include 1) the fixed feature set and closed interaction rules imposed by the role system on the device, and 2 ) The dilemma of underlying network characteristics impedes the adaptation of service discovery protocols to diverse and dynamic device capabilities, connectivity and user intent in the environment; 3) User-driven autonomy makes the device lack intrinsic motivation for the interaction rules in maintenance protocols The first problem is solved based on the ability and policy driven AP model, the virtual network (Virtual Network) and group mechanism are introduced to solve the second problem, and the adaptive VGAP framework is obtained. Based on the market Mechanism to establish market model to solve the problem of automatic selection of VGAP strategy and the third problem of distributed constraint optimization and get the adaptive service discovery mode VGMAP.The prototype system and quantitative experiments verify the VGMAP mode adaptability.