論文將 5G 網路與 ICN 架構結合，以降低網路流量消耗，並提出基於 SDN 的預先換手方案，旨在解決 5G 網路面臨用戶數量激增時可能導致的網路效能低下和用戶移動性所帶來的挑戰。論文提出基於 SDN 的預先換手方案，詳述結合 ICN 與基於 SDN 預先換手方案的 5G 架構換手流程，提出方案利用 SDN 控制器搜集使用者設備的定位以即時更新動態資訊，並根據使用者設備的動態資訊及設備與相鄰基地台的距離倒數進行權重值加成，以此選出擁有最高權重值的相鄰基地台作為使用者設備即將換手的目標基地台。透過目標基地台事先執行換手流程中準備階段的部分工作以及預先獲得使用者設備尚未被回應需求的資料封包，待使用者設備真正進行換手時，能更快速地完成換手流程，減少換手帶來的延遲和連線中斷。實驗結果證明，結合 ICN 與 SDN 的 5G 網路架構在平均傳輸延遲、緩存命中率及平均傳遞跳數皆有更好的表現，且提出的預先換手方案能有效降低使用者設備換手對網路的影響，提高整體網路效能以及增強用戶體驗。

This thesis integrates the 5G network with an Information-Centric Networking (ICN) architecture to decrease network traffic consumption. It introduces a pre-handover scheme based on Software-Defined Networking (SDN) to address the challenges stemming from the rapid surge in 5G network users and user mobility, possibly leading to diminished network performance. Thus, the thesis presents an SDN-based pre-handover scheme and elaborates on the handover process within the 5G architecture, amalgamating ICN and SDN pre-handover approaches. In the proposed scheme, the SDN controller captures location information from user equipment for real-time dynamic updates. Assign weight values to neighboring base stations based on dynamic information and the reciprocal distance from the user equipment. The adjacent base station with the highest weight is designated as the target for the impending handover of the user equipment. Having target base stations execute some tasks during the pre-handover setup phase and procuring data packets that the user equipment has yet to respond to can expedite the handover process when initiated by the user equipment. It helps curtail delays and connection interruptions associated with handovers. Simulation results underscore that integrating ICN and SDN within the 5G network architecture yields enhanced average transmission delay, cache hit ratio, and average delivery hops. The proposed pre-handover scheme effectively alleviates the impact of user equipment handovers on the network, elevating overall network performance and enhancing the user experience.

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