Abstract
The rapid growing of Internet makes the multimedia and broadband services more and more close to the users either by wireless network or wireline network. Because of the multimedia and broadband services, the wireline and wireless networks are required to have the capability to furnish these real-time services. To achieve the purpose, the bandwidth management is the most important issue. Our research deals with the bandwidth management in the central-controlled shared-media wireless and wireline networks and make the networks be able to manage the network bandwidth according to the classes of applications. Wireless LANs, each consists of a base station and several remote stations, interconnected by ATM backbone network will be one of the most attractive infrastructures for modern multimedia applications. A QoS (Quality of Service) Guaranteed MAC (Medium Access Control) Protocol is designed for wireless LANs interconnected by ATM backbone network. Both time-sensitive and time-insensitive transmission services are furnished and guaranteed. Efficient call admission control algorithm as well as scheduling algorithm are designed for the base stations and remote stations so that multiple real-time connections can be furnished concurrently with guaranteed QoS. For people at home, two typical wireline networks are available to access the Internet: telephone network and CATV network. A hierarchical Hybrid Fiber-Cable (HFC) network is considered and is a hierarchical tree-based structure, where the traditional HFC network is partitioned into segments. Each segment is coordinated by a central traffic controller (CTC). A reservation-based traffic policy is designed for the CTC to schedule the data transmissions within the segment to provide guaranteed QoS The CTC also furnishes the bridging function so that local traffic within the controlled segment is filtered to save the network bandwidth. Based on the segmentation concept and filtering function, the bandwidth can be reused efficiently and the system performance is improved significantly. A reservation-based traffic policy is also proposed for the CTC to schedule the data transmissions within the segment to provide guaranteed QoS, such as constant bit rate (CBR) service and variable bit rate (VBR) service. The CTC implements the bridging function so that local traffic within the controlled segment is filtered to save the network bandwidth. Based on the segmentation concept and filtering function, the bandwidth can be reused efficiently and the system performance is improved significantly. Through the proposed traffic policy, the hierarchical HFC network offers guaranteed QoS for the users.