Designing Energy-Efficient Wireless Access Networks:LTE and LTE-Advanced
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1資訊工程系 智慧型系統實驗室 iLab南台科技大學
Designing Energy-Efficient Wireless Access Networks:LTE and LTE-Advanced
Deruyck, M. ; Joseph, W. ; Lannoo, B. ; Colle, D. ; Martens, L.
Internet Computing, IEEE Volume:17 , Issue: 5 Sept.-Oct. 2013
報告者 :羅光男
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資訊工程系 智慧型系統實驗室 iLab南台科技大學 2
Outline1. Introduction2. Energy Efficiency in Wireless Access
Networks3. Power Consumption4. Range of Base Station Types5. Bit Rate6. Users7. Results8. Future
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資訊工程系 智慧型系統實驗室 iLab南台科技大學 3
Introduction(1/3)• 近幾年來,行動用戶的普及率急速增高,從
2003年 20%到 2009年 67%
• 基地台能源消耗的深入研究可以幫助降低基地台的電力消耗
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Introduction(2/3)1. Long-Term Evolution(LTE)
– Release 8/9
2. LTE-Advanced(LTE-A)– Release 10
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資訊工程系 智慧型系統實驗室 iLab南台科技大學 5
Introduction(3/3)影響 LTE-A能源消耗的原因
1. Carrier Aggregation(CA)
2. heterogeneous networks
3. multiple-input, multiple-output (MIMO)
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資訊工程系 智慧型系統實驗室 iLab南台科技大學 6
Energy Efficiency in Wireless Access Networks
EE=
R: range (in km) B: physical bit rate by the base station (in Mbps) U: number of served users
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資訊工程系 智慧型系統實驗室 iLab南台科技大學 7
Power Consumption
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資訊工程系 智慧型系統實驗室 iLab南台科技大學 8
Range of Base Station Types(1/2)• 要確定基地台的範圍,必須計算被允許的最大路徑損失 (Maximum allowable path loss,)
• 使用兩個不同 Propagation Model的基地台1. Erceg C model
2. ITU-R P.1238 model
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Range of Base Station Types(2/2)• An important parameter is the receiver signal-to-
noise ratio (SNR) for a certain bit error rate (BER) and depends on the modulation and coding rate used
• The higher the bitrate, the higher the receiver SNR and the shorter the range
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Bit Rate影響因素:
1. User data2. Total number of carriers3. Bandwidth4. Modulation5. Coding rate
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Users• macrocell與 femtocell最大的不同在於所能提供服務的用戶數量• 用戶被分配到最小單位的 physical resource
block (PRB),以 12個子載波為一組
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Results(1/4)• Carrier Aggregation
QAM = quadrature amplitude modulationQPSK = quadrature phase shift keying
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Results(2/4)• Heterogeneous Deployments
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Results(3/4)• MIMO
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Results(4/4)• MIMO
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Future 未來應該落實 LTE-Advanced,因為能比LTE更好的提高能源利用效率。此外,未來工作可能研究如何將所得到的特點,實際應用進去。
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Q & A