Abstract
As broadband multimedia services and wireless communication become popular, there is a growing demand of supporting integrated services in mobile environment. The resource reservation mechanism is essential for QoS provisioning in Integrated Services networks. Resource Reservation Protocol (RSVP) is a receiver oriented resource reservation setup protocol being an Internet standard approved by Internet Engineering Task Force (IETF). However, the RSVP designed for fixed network has been facing a great challenge owing to the participation of wireless networks. Provision of QoS in wireless networks is more complex than in wired networks due to user mobility.In this study, we will address the issue of resource reservation to fulfill QoS requirements for mobile host and emphasize the deficiencies of RSVP in mobile environment. We describe a new signaling protocol for mobile hosts to reserve resource in Integrated Services provided by Internet with mobile hosts. Under our approach, we extend the RSVP model based on IP multicast to support mobile hosts. The mobility of a host is modeled as a change in multicast group membership. To overcome mobility impact on service guarantees, mobile hosts need to make resource reservation in advance at the locations, which it may visit during the lifetime of the connections. These locations become the leaves of the multicast tree in our design. To obtain more efficient use of scarce wireless bandwidth, we propose the extended reservation model. The mobile proxy in a cell is required to mange resource reservations and other mobility related tasks on behalf of mobile hosts. The characteristics of our proposal include (1) extended reservation models (2) mobile proxies (3) multicast connection tree (4) new RSVP control messages.We also evaluate the performance of our proposal against original RSVP combining with Mobile IP. The mobility impacts on packet delay, bandwidth utilization and packet loss rate are investigated via simulations. Our approach achieves more reliable average data rate wherever the location of mobile host. Moreover, our proposal can provide 17% gain in average data rate. Furthermore, our proposal can provide 45% reduction in packet delay compared to RSVP Tunnel scheme when the mobile receiver is moving to another cell.