臺灣博碩士論文加值系統

D2D通訊為兩個行動設備間的通訊無須通過基地台，其可提升頻譜效率、系統容量及蜂窩覆蓋率。當D2D通訊與蜂窩網路共享頻段時，此稱為重疊式帶內D2D (underlay inband D2D)，重疊式帶內D2D由於與蜂窩網路共用頻段，D2D通訊與蜂窩設備和基地台間通訊會互相干擾，故先前研究主要使用資源分配來決定哪些D2D與蜂窩設備配對來共用頻段以降低干擾問題，這些研究大多以一最小距離為門檻值，當D2D與蜂窩設備距離超過此門檻值即可共用頻段，然超過此門檻值僅表示D2D與蜂窩設備間互相干擾較小，但不代表可得到理想的頻寬，因此本論文提出多重虛擬扇區之資源分配方法(Resource Allocation with Multiple Virtual Sectors，MVS)，試圖在超過此門檻值的條件，進一步將D2D與干擾程度較低的蜂窩設備作配對，以降低干擾來提升整體產能(Throughput)，MVS具有三項特點：(1)扇區切割：將整個區域以基地台為圓心，依不同的半徑及角度切割成若干個扇區；(2)互補扇區：依距離超過門檻值的條件為每個扇區找尋互補扇區群，且互補扇區依其產生之吞吐量分最佳、次佳、尚可三類；(3)外而內配對：共享資源的 D2D 設備與蜂窩設備間距離愈遠對蜂窩設備造成的干擾較少，故從最外圈的D2D設備優先搜尋共享頻段的蜂窩設備。模擬結果顯示MVS能比之前研究VCS及DRC分別提升30.1%及14%的產能。

D2D communication means direct communication between two devices without traveling through the base station. It can improve spectral efficiency, system capacity, and cellular coverage. When D2D communication share the same radio resource with cellular communication, it is called as underlay inband D2D. In underlay inband D2D, since radio resource is shared, D2D communication and cellular communication will interfere with each other. The previous resource allocation methods for mapping D2D and cellular resources is mainly based on a minimum distance threshold to reduce the interferences. That is, the distance between D2D and cellular devices must exceed the minimum distance threshold. However, exceeding the distance threshold only means that the interference between them is acceptable, but does not represent that D2D devices can get enough good bandwidth.
The thesis proposes a resource allocation method for D2D communication, called Resource Allocation with Multiple Virtual Sectors (MVS). MVS has three characteristics: (1) sector division: the coverage of base station is divided into several sectors depending on the different radiuses and angles; (2) Complementary sectors: MVS searches complementary sectors for each sector by the distance threshold and classifies complementary sectors into optimal, suboptimal and acceptable sectors by obtained throughput; (3) outer-to-inner mapping: when the distance between D2D and cellular devices is longer, the interference between them becomes less. Thus, D2D devices in outer will has a higher priority to be mapped. Finally, the simulation results show that MVS can improve 28.6% and 12.7% throughput, compared with previous work, Virtual Cell Sectoring (VCS) by 28.6% and Distance-constrained Resource-sharing Criterion (DRC) by 12.7%, respectively.

摘要 I
Abstract II
目錄 III
圖目錄 IV
表目錄 V
第一章 緒論 1
第二章 相關研究 3
2.1重疊式帶內D2D通訊 3
2.2重疊式帶內D2D通訊研究比較 6
2.3重疊式帶內D2D通訊之干擾場景 8
2.3.1上行頻段資源 8
2.3.2下行頻段資源 9
第三章 研究方法 11
3.1參數說明 11
3.2問題描述 13
3.3 MVS 13
3.4 MVS虛擬程式碼 18
第四章 系統模擬與數據結果 19
4.1模擬環境與參數設定 19
4.2模擬結果 20
4.2.1 MVS同心圓個數對系統容量影響 20
4.2.2 MVS、VCS、DRC比較結果 22
第五章 結論 26
參考文獻 27

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