網際網路的快速發展使得多媒體與寬頻服務越來越盛行。而因為多媒體網路與寬頻網路的發展，有線網路與無線網路被要求能提供即時服務。為了達到這個目的，頻寬管理便顯的非常的重要。我們的主要研究便在於共享媒體的有線網路與無線網路上的頻寬管理。
每一個無線網路包含一個基地台與多個遠端台，且其與非同步傳輸模式骨幹網路相連結。這種網路架構在現代的多媒體環境中受到非常廣泛的討論。所以，我們在以非非同步傳輸模式骨幹網路相連結的無線網路架構中設計一個保證服務品質的媒介存取控制通訊協定，以提供並保證即時服務與非即時服務。此協定包含一個有效率之排程演算法與呼叫允許控制演算法。

對於家庭的用戶來說，目前有兩種網路連線方式﹔一為電話網路，一為同軸電纜電視網路。為了改良同軸電纜電視網路的的缺點，延伸其為混合式光纖同軸電纜網路。我們將混合式光纖同軸電纜網路切割成一個個小的區段，每一個小區段由一個中央訊務控制器來控制其區段中訊務之傳輸，使網路成為一個階層式的樹狀架構，稱之為階層混合式光纖同軸電纜網路。在中央訊務控制器裡，放入一個保證服務品質的媒介存取控制通訊協定來牌成區段中的訊務傳輸以提供服務品質保證。中央訊務控制器另一個非常重要的功能是橋接功能，此功能主要過濾區段中的訊務以節省別的區段中的頻寬。所以，導入區段觀念與橋接功能可使得頻寬被有效的重新使用，並提高系統的效能。

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.

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