IEEE 802.16m下，Macrocell-to-Femtocell (M2F)與Femtocell-to-Femtocell (F2F)間共頻干擾與頻寬分配問題研究與策略

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Title:	IEEE 802.16m下，Macrocell-to-Femtocell (M2F)與Femtocell-to-Femtocell (F2F)間共頻干擾與頻寬分配問題研究與策略
Other Titles:	Study and Strategies on Macrocell-To-Femtocell (M2f) and Femtocell-To-Femtocell (F2f) Co-Channel Interference and Low Bandwidth Utilization Mitigations for Ieee 802.16m Networks
Authors:	石貴平
Contributors:	淡江大學資訊工程學系
Keywords:	毫微微蜂巢式基地台;IEEE 802.16m;全球互通微波存取;資源管理配置;正交分頻多工多重存取;Femto ABS;IEEE 802.16m;Worldwide Interoperability for Microwave Access (WiMAX);Resource Management;Orthogonal Frequency Division Multiple Access (OFDMA)
Date:	2011-08
Issue Date:	2012-05-07 14:54:28 (UTC+8)
Abstract:	本計畫為兩年期個別型計畫，目標為【IEEE 802.16m下，Macrocell-to-Femtocell (M2F)與 Femtocell-to-Femtocell (F2F)間共頻干擾與頻寬分配問題研究與策略。】本計畫分成兩部分進行探討。第一年計畫主要以降低 M2F 與F2F 共頻干擾為目標進行討論。首先，藉由Femtocell 熱點佈建與 Macrocell 來達到無縫隙資料傳輸。接著，為了降低M2F 與F2F 共頻干擾，本計畫藉由切換Femto Advanced Base Station (Femto ABS)的Low Duty Mode 與調整Femto ABS 的傳輸電量來達到此目的。第一年的計畫分成以下三大目標進行探討：目標一：在 IEEE 802.16m 網路中，探討Femtocell 熱點佈建，以達到無縫隙網路傳輸。考量都會環境既有基礎建設的覆蓋情況下，仍有部分通訊死角是 ABS 無法完整覆蓋與提供服務，或經由Advanced Relay Stations (ARSs)代傳仍無法提供良好傳輸品質的區域，若針對這些少數的用戶進行ABS 或ARS 佈建將不合成本效益。因此，本計畫將藉由規劃Femtocell 熱點佈建增加網路覆蓋率，達到無縫隙網路傳輸。目標二：在 M2F 與F2F 網路中，探討協同合作低負載模式切換機制，以降低共頻干擾。為了要減少M2F與F2F 之間干擾，IEEE 802.16m 針對Femto ABS 定義了低負載模式(Low Duty Mode)。在此模式中，Femto ABS 會保持與ABS 同步但不進行資料之傳輸，因此，能夠減少F2F 與M2F 傳輸干擾。本計畫將藉由挑選適當的Femto ABS 進入Low Duty Mode，以減少F2F 與M2F 共頻道干擾。目標三：在 M2F 與F2F 網路中，探討協同合作傳輸電量控制機制，以降低共頻干擾。透過 Femto ABS 傳輸電量調整機制，使得相鄰兩Femto ABS 的通訊範圍交集最小，以減少F2F 的干擾。因此，本計畫將藉由調整Femto ABS 的傳輸電量，減少M2F 與F2F 共頻干擾。第二年計畫主要以提升網路效能為目標，探討協同合作頻寬分配機制與協同合作多步轉傳頻寬分配機制設計。第二年的計畫就以下二大目標進行探討：目標四：在 M2F 與F2F 網路中，探討協同合作頻寬分配機制，以提升網路效能。由於 Femtocell 間網路負載量的差異，某些Femto ABS 無法保證傳輸服務品質，而某些Femto ABS 卻因網路負載量輕，卻無法提供協助而造成頻寬浪費。因此，本計畫將藉由挑選適當的Femto ABS 進行協同合作傳輸，以提升網路效能。目標五：在 M2F 與F2F 網路中，探討協同合作多步轉傳頻寬分配機制，以提升網路效能。除了利用挑選適當的 Femto ABS 進行協同合作傳輸外，透過多步轉傳協同合作傳輸方式亦可提升頻寬利用率。然而，多步轉傳方式會導致傳輸上的延遲，因此，本計畫將探討多步轉傳與協同合作利弊，選擇適當的傳輸方式解決頻寬浪費問題，進而增加頻寬利用率。在計畫進行的過程中，本計畫會根據不同的目標設計演算法或協定，並使用模擬程式進行模擬，期望透過模擬之數據，驗證本計畫所設計之演算法或協定之執行效能，並進一步改良演算法。若在模擬程式上的測試能符合預期之成效，本計畫更希望就所開發之演算法或協定移植到實驗平台中，測試其效能，以評估演算法或協定之可行性，使所開發之演算法或協定能夠提昇網路效能，符合預期目標。 This project is a two-year personal project. The theme of this project is “Study and Strategies on Macrocell-to-Femtocell (M2F) and Femtocell-to-Femtocell (F2F) Co-channel Interference and Low Bandwidth Utilizations Mitigations for IEEE 802.16m Networks.” In the first year of the project, the planning of the femtocells deployment will be studied first to achieve the seamless wireless communications. In the meanwhile, the low duty mode switch mechanism and power control mechanism for Femto ABS to mitigate the M2F and F2F co-channel interference for the IEEE 802.16m networks will be investigated as well. The objectives of the first-year project are listed as follows.  Investigate the planning of the femtocells deployment to achieve seamless wireless communications for IEEE 802.16m networks,  Investigate the low duty mode switch mechanism by using cooperative transmissions to mitigate M2F/F2F co-channel interference for IEEE 802.16m networks, and  Investigate the power control mechanism by using cooperative transmissions to mitigate M2F/F2F co-channel interference for IEEE 802.16m networks. In the second year of the project, cooperative bandwidth allocations and cooperative relaying bandwidth allocations to improve the bandwidth utilizations between femtocells and macrocells in IEEE 802.16m networks will be investigated. The objectives of the second-year project are listed below.  Investigate bandwidth allocation mechanism by using cooperative transmissions to improve the bandwidth utilizations in IEEE 802.16m networks, and  Investigate bandwidth allocation mechanism by using cooperative relaying transmissions to improve the bandwidth utilizations in IEEE 802.16m networks. Comprehensively, the proposed project can mitigate the M2F/F2F co-channel interference by cooperative transmissions in IEEE 802.16m networks. In addition, the proposed project also can increase the bandwidth utilizations. Through the deployment of femtocells with the proposed resource management mechanisms, the co-channel interference can be mitigated and the network throughput can be improved in IEEE 802.16m networks.
Appears in Collections:	[Graduate Institute & Department of Computer Science and Information Engineering] Research Paper

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