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Designing Energy-Efficient Wireless Access Networks:LTE and LTE-Advanced

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. Outline. Introduction

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Designing Energy-Efficient Wireless Access Networks:LTE and LTE-Advanced

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  1. Designing Energy-Efficient Wireless Access Networks:LTEand 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

  2. Outline • Introduction • Energy Efficiency in Wireless Access Networks • Power Consumption • Range of Base Station Types • Bit Rate • Users • Results • Future

  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

  4. Introduction(2/3) • Long-Term Evolution(LTE) • Release 8/9 • LTE-Advanced(LTE-A) • Release10

  5. Introduction(3/3) 影響LTE-A能源消耗的原因 • Carrier Aggregation(CA) • heterogeneous networks • multiple-input, multiple-output (MIMO)

  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

  7. Power Consumption

  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 • Erceg Cmodel • ITU-R P.1238 model

  9. 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

  10. Bit Rate 影響因素： • User data • Total number of carriers • Bandwidth • Modulation • Coding rate

  11. 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

  12. Results(1/4) • Carrier Aggregation QAM = quadrature amplitude modulation QPSK = quadrature phase shift keying

  13. Results(2/4) • Heterogeneous Deployments

  14. Results(3/4) • MIMO

  15. Results(4/4) • MIMO

  16. 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。

  17. Q&A

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