群播提供了一個完善的解決方案於族群通訊的多媒體應用，例如視訊會議和節目廣播等。這篇論文專注在無線非同步傳輸網路的群播。提出了兩個策略。第一個是圓環主控者輸替協定。這個協定是基於多對多群播協定，它只允許一個傳輸者在連接樹上傳輸。動態的角色管理方案協調每位傳輸者的傳輸送權。 在第二個策略中，於非同步傳輸網路的較基層修改其擁塞控制機制。首先，一個稱為“同時多傳輸多點對多點模擬通道連接”的連接樹被建立以便連接群組中的每一個成員。這個連接樹允許各各成員同時傳送資料。除此之外，在擁塞控制上採兩種漏水桶演算法，各設計在使用者層和網路層。在使用者層，一個資訊流調形演算法被採用。在網路層，一個雙層的漏水桶演算法用以檢查和調形。在這些控制下，成員的細胞將交錯在連接樹上，由傳送者端被送到目的端。目的端收到細胞再重組回其協定資料單位。 這篇論文分五章。第一和第二章是無線非步傳輸網路和群播的介紹。演算法被放在第三章。第四章為分析和模擬的結果。最後，第五章為結論。 Multicast provides an excellent solution for allowing a particular group of the partners to participate in a multimedia transmission, such as videoconference and program distribution. This thesis addresses on the wireless ATM multicasting issue, two schemes are proposed to provide many-to-many multicast services. The first proposal is a round robin root devolution protocol. This protocol is based on a many-to-many multicast protocol that has only one sender on a connect tree. The dynamic membership management scheme makes the identity of sender can be replaced accordingly. The second approach provides a lower level design with the leaky bucket congestion control on the ATM switch. Firstly, a multi-delivering multipoint-to-multipoint virtual channel connection, a connection tree is constructed to connect the members of a multicast group in wireless ATM network. This connection tree allows individual members to deliver multimedia traffic at the same time. Furthermore, in congestion control, two leaky bucket based algorithms are proposed in user level and network level. At user level, a traffic-shaping algorithm is adopted. The output cells stream of traffic-shaping algorithm is enforced to conform to the traffic contract. For the network level, a two-level leaky bucket algorithm is proposed to perform conformance checking and traffic shaping. Under these controls, the cells of the members are interlaced on the connection tree and flow from sources to destinations. After the cells are received by the destinations, the re-assembly of AAL layer’s protocol data unit (PDU) is performed. This thesis is organized as five chapters. Chapter 1 and chapter 2 are the introductions of wireless ATM and multicast, respectively. The proposed algorithms are depicted in chapter 3. Chapter 4 covers the analysis and simulation results. Finally, a conclusion is made in chapter 5. Keywords: Wireless ATM network, Quality of Service, Connection Tree, Multi-delivering Multipoint-to-multipoint Virtual Channel Connection, Leaky Bucket Algorithm, Congestion Control and Mobility.
