群播與廣播服務(Multicast and Broadcast Service, MBS)是第四代行動通訊網路的重要服務之ㄧ。MBS針對不同的使用者人數，可以藉由適當的服務架構進行傳送來提升頻譜使用效率(Spectrum Efficiency)。而傳統的群播與廣播服務，採用固定的服務架構進行傳送，所以無法有效率的使用頻譜資源。
本論文提出了群播與廣播服務架構選擇機制，在滿足使用者服務品質的情況下，各個蜂巢式基地台(cell)選用適當的服務架構來提升整體網路的頻譜使用效率。本篇的MBS架構選擇機制，主要是透過本論文所提出的服務架構平均消息量演算法以及頻譜使用效率演算法，依據各基地台(Base Station, BS)涵蓋範圍內的使用者人數，計算出在各種服務架構模式下平均每個cell的平均消息量與頻譜使用效率，讓系統選出效能最佳且滿足服務品質的服務架構模式，並進一步選擇適合各個cell的服務架構。此外，本篇提出的平均消息量公式也可針對各種不同通訊涵蓋範圍比例的效能進行分析。

關鍵詞：群播與廣播服務、服務架構、服務架構模式、消息量、頻譜使用效率

Multicast and broadcast service (MBS) is one of the important services for 4th generation wireless communication systems. According to different number of users, we can select the suitable service architecture to improve spectral efficiency for MBS. The tradition MBS can't use the spectrum resource by fixed service architecture.
In this thesis, we proposed a service architecture selection for multicast and broadcast services. In the situation to ensure user's quality of service, each cell can select the suitable service architecture to improve overall network's spectral efficiency. According to the number of user in each cell's coverage, we can get the average mutual information in each cell for different service architecture based on our analytical equations. then select the best service architecture. In addition, our analytical equations can also calculate the performance for different coverage ratio.

Index Terms: Multicast and broadcast service (MBS), service architecture, mutual information, spectral efficiency

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