臺灣博碩士論文加值系統

移動管理在次世代無線通訊網路中是一個重要的議題，其中包含了無縫的換手機置以及位置的管理，每一個使用者可以在不同子網路之中移動而持續取得網路服務。現今已提出各種的無線網路技術以支援行動中的使用者取得網路服務，一種新無線技術，稱做WiMAX，被定義在IEEE 802.16e 標準中，提供了彼IEEE 802.11更高的頻寬和更大的無線傳輸範圍。在無線IP網路中，移動式網際網路協定第六版(MIPv6) 提供了綁定訊息來更新使用者的IP資訊以支援第三層的移動管理。階層式MIPv6 (HMIPv6) 則是提供了階層式的網路架構以減少在微觀移動時綁定更新所造成的換手延遲，然而，HMIPv6在宏觀移動中造成了長時間的換手延遲以及大量的封包遺失。本篇論文以HMIPv6為基礎之下提供了一個夥伴協助之跨層換手機制，稱為 P_HMIPv6 協定，P_HMIPv6協定是一個結合了第二層和第三層的方法，並加入新的節點，稱做夥伴站台，夥伴站台是有著轉送能力的移動站台，此移動站台是處於靜止的狀態。藉由夥伴站台的幫助下，新的CoA可以先被測試是否重複以及區域性的綁定動作可以在第二層換手之前先被完成。藉由數學分析以及模擬結果可以得知P_HMIPv6確實縮短了換手延遲時間，減少了封包遺失的量以及換手時封包延遲變異量亦是降低。

Mobility management, which supports seamless handoff and locality, is a key issue in the next generation wireless communication networks. Users get mobility capability and move around different kinds of subnets. Various enhanced wireless technologies, are proposed to support many kinds of internet services for mobile users. A new wireless technology, called WiMAX, has been specified in the IEEE 802.16e standard document, which provides higher bandwidth and larger coverage area than the IEEE 802.11 networks. In wireless IP network, Mobile IPv6 (MIPv6) provides the binding update message to update the mobile user’s IP information for supporting layer 3 mobility. Hierarchical Mobile IPv6 (HMIPv6) is proposed by employing a hierarchical network structure to reduce handoff latency of binding update procedures. However, HMIPv6 suffers large handoff delay and packet lost in macro mobility for
mobile users. This thesis presents a cross-layer partner-assisted handoff mechanism based on HMIPv6, termed PHMIPv6 protocol. The PHMIPv6 protocol is a cross-layer, layer-2 and layer-3, approach. The partner station (PS), which is a new component with relay ability and adopted by our protocol, is an static mobile station (MS). With the aid of the PSs, care-of address (CoA) can be pre-acquired and DAD operation can be pre-executed by the PS before the MS initials the layer 2 handoff. The simulation results show that PHMIPv6 protocol actually achieves the performance improvements in the handoff delay time, the packet loss rate, and the
handoff delay jitter.

1 Introduction 1
2 Related works 5
2.1 IPv6 based mobility solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Mobile IPv6 based approach in IEEE 802.16e system . . . . . . . . . . . . . . . . 7
3 Preliminary 10
3.1 Mobility in IEEE 802.16e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Network architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3 Challenge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.4 Basic idea of our handoff scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4 Partner-Assisted HMIPv6 Protocol 18
4.1 partner discovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2 Successful case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3 Unsuccessful case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5 Performance Analysis 27
5.1 mathematical analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.2 Simulation result . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
6 Conclusion 38

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