SIP為基礎之行動管理協定在
IEEE 802.11與IEEE 802.16網路間之信令分析

現今沒有一套有效的行動管理機制支援在IEEE 802.11與IEEE 802.16異質網路間的換手，因此本論文分析了以SIP為基礎的行動管理協定行為在802.11無線區域網路與802.16無線都會網路。本論文研究著重於在802.11與802.16網路間換手時之信令過程，因此以SIP為基礎的行動管理協定換手的程序由以下子程序所組成︰（1）行動主機在MAC層的初始（802.11與802.16各自的MAC層初始運作），（2）透過在最新連接到網路的DHCP伺服器得到最新IP位址（網路層的運作），（3）SIP行動管理程序（應用層運作，有二種機制︰pre-call mobility與mid-call mobility，依據不同的情況下有不同的機制程序），由以上換手子程序來呈現在異質網路間換手時的信令。這篇論文分析結果參考一些數學式的計算呈現關於換手的程序所產生信令的傳送延遲與負載量。最後，從分析結果可得知關於SIP為基礎的行動管理協定在802.11與802.16間換手的差異。在802.11換手到802.16情況中是產生較多的信令傳送延遲，但換手時信令的負載則是幾乎相同，另外pre-call mobility是比mid-call mobility有更佳的效能。

關鍵字

行動管理

並列摘要

Nowadays, there were no set of effective mechanisms of mobility management to support handoff in heterogeneous networks like a wireless overlay network between IEEE 802.11 and IEEE 802.16. Thus, we analyze behavior based on SIP-based mobility management protocols between 802.11-based wireless local area network (WLAN) and 802.16-based wireless metropolitan area network (WMAN) in this thesis. This thesis focuses on signaling processes, during handoff between 802.11 and 802.16 networks. Accordingly, the SIP-based mobility management protocols handoff procedure consists of the following sub-procedures: (1) Mobile Host initialization at MAC layer (the MAC layer initial operation is based on 802.11 and 802.16 respectively), (2) Acquisition of a new IP address through Dynamic Host Configuration Protocol (DHCP) server in a newly connected network after handoff (operation of network layer), (3) SIP mobility management process (operation of application layer, there are two mechanisms: pre-call mobility and mid-call mobility, according to different situations). The above-mentioned handoff sub-procedures of signaling in heterogeneous networks are presented. This thesis refers some mathematic equations to present analytical results about handoff procedures that generate signaling transmission delay and overhead. Finally, the analytical results can find out that the differences concerning SIP-based mobility management protocols between 802.11 and 802.16 networks. For the case of handoff from 802.11 to 802.16 networks, it generates more signaling transmission delays, but the signaling overhead of handoff are almost the same. Besides, pre-call mobility performances are greater than mid-call mobility.