Content-Seamless Communications in Ubiquitous Computing Networks

普适计算网络中的内容无缝通信

• 批准号: 13650442
• 负责人: YAMADA Shigeki
• 金额: $ 2.18万
• 依托单位: National Institute of Informatics
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650442/
• 关键词: Network architecture; User context; Context awareness; Information delivery service; Privacy protection; Mobile agent; Performance evaluation; 性能評価; プライバシ保護; コンテクスト・アウェアコンピューティング; SIP; all IPネットワーク; サービス; メディア変換; 通信コンテクスト; 3GPP; CC; PP

This research project aims at establishing the basic technologies associated with the following three technical issues to realize ubiquitous computing networks the environment-adaptive personal communications architecture, the context-aware information delivery network architecture and systems, and the privacy protection technologies.(1)An environment-adaptive personal communications (EAPEC) systemAn environment-adaptive personal communications (EAPEC) system is proposed that accepts communications from senders, automatically selects the most appropriate communications device, medium, and service for the receiver, converts the sender's message into the selected form, and forwards the converted message to the receiver. The EAPEC can easily be implemented by adding functional components of five types to the 3GPP-based all IF network: The EAPEC architecture is evaluated in terms of call-setup times by theoretical analysis and simulation. Performance analysis indicates that the performance … More of application servers and degrees of server utilization greatly affects the call-setup times while the IP-network delay does not have much effect under practical conditions.(2)Context-aware information delivery network architecture and systemsContext-aware computing is a requisite to achieve "invisibility" in ubiquitous computing, where user context such as the user's location, time, activity status, activity history, and preferences are automatically captured and analyzed by computers to provide users with relevant content and services. Two types of network architectures are proposed that use. UMTS Release 5 architecture and wireless LAN suitable for context-aware information delivery services. The first type of network architecture is the NCA (network-centric architecture) and the second is the ECA (end-user-centric architecture). The two architectures are modeled with a queuing network and their response times are compared through theoretical analysis and simulation. The results indicate that with low-performance servers, the response times of the ECA are generally shorter or almost the same as those if the NCA. However, with high-performance servers, the response times of the NCA are generally shorter except during high server utilization.(3)Privacy protection technologiesA mobile agent-based privacy model characterized by two basic ideas is proposed. First, the model encapsulates personal data and the associated user's preferences into a privacy capsule. The purpose of encapsulation is to hide the data and prohibit it from flowing to the world outside of the capsule and to check the user's preferences for the personal data every time it is accessed. As a second feature, the model allows mobile agents to migrate into the privacy capsule, to execute necessary processes referring to the personal data, and to generate execution results to be utilized by the outside world. The mobile agent mechanism provides a robust and effective solution for enabling service execution while keeping the personal data hidden inside the privacy capsule. Less

本研究项目旨在建立与以下三个技术问题相关的基础技术，以实现普适计算网络：环境自适应个人通信架构、上下文感知信息传递网络架构和系统以及隐私保护技术。（1）环境自适应个人通信（EAPEC）系统提出了一种环境自适应个人通信（EAPEC）系统，它接受来自发送者的通信，自动为接收者选择最合适的通信设备、介质和服务，转换发送者的消息EAPEC 可以通过在基于 3GPP 的全中频网络中添加五种类型的功能组件来轻松实现： EAPEC 架构根据理论的呼叫建立时间进行评估。性能分析表明，应用服务器的性能和服务器利用率对呼叫建立时间影响很大，而IP网络延迟在实际情况下影响不大。(2)上下文感知信息传递。网络架构和上下文感知计算是普适计算实现“隐形”的必要条件，计算机自动捕获和分析用户的位置、时间、活动状态、活动历史和偏好等用户上下文，为用户提供相关内容和服务提出了两种类型的网络架构，它们适用于上下文感知信息传送服务，并且使用UMTS版本5架构。 ECA（以最终用户为中心的架构）通过排队网络进行建模，并通过理论分析和仿真对它们的响应时间进行比较。结果表明，对于低性能的服务器，ECA的响应时间通常较短。或者与NCA几乎相同。但是，对于高性能服务器，除了在高服务器利用率期间外，NCA的响应时间通常更短。(3)隐私保护技术基于移动代理的隐私模型，其特征在于两个基本思想。首先，提出了。该模型将个人数据和相关用户的偏好封装到隐私胶囊中，封装的目的是隐藏数据并阻止其流向胶囊外的世界，并在每次访问时检查用户对个人数据的偏好。作为第二个功能，该模型允许移动代理迁移到隐私胶囊中，执行涉及个人数据的必要过程，并生成供外界使用的执行结果。移动代理机制提供了稳健且有效的机制。在保持个人隐私的同时启用服务执行的解决方案隐藏在隐私胶囊内的数据更少。