近年來由於網際網路以及無線網路的快速發展，造成人們對於網路應用服務的需求也相對的日益增加。因此如何有效的運用網路頻寬以及提供服務品質保證成為了目前網際網路所面臨的重要問題。在本文中我們先對目前現有的資源保留機制作一些簡單的介紹，這些機制包含了如何在Macro-domain以及Micro-domain 中提供品質服務保證。其中包含了Pointer Forwarding、Crossover Router Discovery 等機制，這些機制都是為了改善使用者在移動時路徑資源重新保留的速度以及網路頻寬的使用效率，其主要目的在於提供使用者無縫隙的換手服務。其中Pointer Forwarding的方法提供了相當快速的換手服務但卻相對的使用了過度的頻寬，而Crossover Router Discovery的方法則是針對在樹狀拓樸下提供快速的換手以及有效的頻寬資源保留。接著在本文中我們提出了三種混合式的資源保留機制，這三個機制融合的各種方法的各種特性。透過模擬的結果顯示，我們所提出的資源保留機制不論在網路資源的使用上以及換手的速度上都提供了相當優異的效能。 Recently, progress of wireless communication technology has made people easily access wireless network via various kinds of portable devices (PDA, Cell Phone, Notebook, etc.). Due to the fast growing of wireless network deployment, human can access wireless network easily, and it also stimulates the population of using mobile services. However, people always claim for stable quality of service (Qos), especially when users are accessing real-time or multimedia applications during movement. In this thesis, we introduce several existing schemes to deal with this issue, which includes Pointer Forwarding scheme and Crossover Router Scheme. These schemes are used for supporting seamless Qos handoff under micro-mobility domain. Then, based on the above schemes, we propose three hybrid methods to combine the advantages of those related schemes. Furthermore, we carry out our simulation results and show the performance of the proposed schemes. From the simulation results we found that the Pointer Forwarding can support fast handoff but in lack of efficiency of using link bandwidth. The Crossover Router Scheme can reserve link bandwidth more efficient than Pointer Forwarding scheme. Overall, the simulation results show that our proposed hybrid schemes can support seamless and efficient RSVP branch path rerouting during handoff.
