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|標題:||一個以信標為基礎之具備服務品質保證的WiMAX FemtoCell 架構換手掃描機制|
A Beacon-based Handover Scanning Mechanism with QoS Support in WiMAX FemtoCell Architecture
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|摘要:||WiMAX FemtoCell網路技術是未來趨勢，可以提供更良好的室內覆蓋率、服務品質、降低網路佈建成本，以及減輕基地台負載量。傳統的WiMAX網路，因為WiMAX BS (Base Station)訊號強度較fBS (Frmto Base Station)強，所以就算鄰近地區，有可以提供更良好服務的fBS，MS (Mobile Station)也不會主動啟動換手掃描機制。此外，WiMAX FemtoCell網路存在許多fBS，所以MS會浪費許多時間與無線資源，用於掃描鄰近的fBS。因此，本篇論文提出一個以信標為基礎之具備服務品質保證的WiMAX FemtoCell架構換手掃描機制，有效解決以上問題。本論文利用信標 (beacon)和MOB_NBR-ADV訊息產生Neighbor Cell List，此表格儲存在MS端，並且包含服務品質保證(QoS)參數，用於決定適合的換手目標基地台。本論文也運用信標訊息，主動啟動換手掃描機制，讓fBS減輕WiMAX BS負載量，達到負載平衡。讓有運用我們機制的網路系統，可以服務更多使用者，並擁有更好的服務品質。本論文運用QualNet網路模擬器做實驗，實驗證明，本論文提出的機制較傳統的WiMAX機制有更好的網路吞吐量(Throughput)和傳輸子通道使用率(Total Channel Usage Ratio)，可以提升FemtoCell使用率，以及37%到51%的網路吞吐量。|
Deploying FemtoCells in WiMAX network, also called WiMAX FemtoCell architecture, gains a lot of attention due to better indoor services can be provided, and WiMAX network traffic can be shared by the FemtoCell. However, since the signal of WiMAX base station (BS) is stronger than FemtoCell Base Station (fBS), the handover procedure may not be triggered even though fBS is within the BS coverage. Besides, since the coverage of FemtoCell is small, it is possible that a huge number of fBSs are deployed in a WiMAX BS coverage, which causes a large volume of power consumption to scan all indoor fBSs for a handover. In this paper, we propose a beacon-based handover scanning mechanism with Quality of Service (QoS) support. In the proposed mechanism, through the beacon and modified MOB_NBR-ADV messages, a neighbor cell list with QoS parameters is generated automatically at mobile station (MS). The decision criteria for triggering the handover procedure and selecting an appropriate target indoor cell from many candidate fBSs are developed. Through the adoption of the proposed mechanism, the system throughput can be improved and the traffic load through the WiMAX BS can be reduced effectively. A simulation was conducted using QualNet simulator. The simulation results demonstrate that along with the number of FemtoCells increases, both the system throughput and the utilization of FemtoCells increase significantly, as compared with conventional handover mechanisms. As compared with Full Scan and Neighbor Cell Information Mechanism, the proposed mechanism can improve 37% to 51% performance in total system throughput, and has a significant higher utilization in case of more FemtoCellls.
|Appears in Collections:||資訊科學與工程學系所|
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