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Michael Timmers, Sofie Pollin, Antoine Dejonghe, Liesbet Van der Perre, and Francky Catthoor Katholieke Universiteit (K.U.) Leuven IEEE Transactions on.

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Presentation on theme: "Michael Timmers, Sofie Pollin, Antoine Dejonghe, Liesbet Van der Perre, and Francky Catthoor Katholieke Universiteit (K.U.) Leuven IEEE Transactions on."— Presentation transcript:

1 Michael Timmers, Sofie Pollin, Antoine Dejonghe, Liesbet Van der Perre, and Francky Catthoor Katholieke Universiteit (K.U.) Leuven IEEE Transactions on Vehicular Technology, TVT 2010

2 Page: 2 WMNL Introduction Conclusion Multichannel MAC protocol for CR networks (MMAC-CR) Multichannel MAC protocol for CR networks (MMAC-CR) Performance Evaluation

3 Page: 3 WMNL Introduction Conclusion Multichannel MAC protocol for CR networks (MMAC-CR) Multichannel MAC protocol for CR networks (MMAC-CR) Performance Evaluation

4 Page: 4 WMNL  Defense Advanced Research Projects Agency (DARPA)  Only 2% spectrum are used at a given time and location.  Federal Communications Commission in the United States (FCC)  15%~85% of the licensed spectrum remains unused at a given time and location.  White holes  A more flexible allocation strategy could solve the spectrum scarcity problem.

5 Page: 5 WMNL  Cognitive Radio (CR) Networks  Primary User (or Licensed User)  Has a license to operate in a certain spectrum band.  Secondary User (or Unlicensed User)  Has no spectrum license.  Additional functionalities are required to share the license spectrum band.

6 Page: 6 WMNL  Primary User (or Licensed User)  Has a license to operate in a certain spectrum band.  Secondary User (or Unlicensed User)  Has no spectrum license.  Hence, additional functionalities are required to share the license spectrum band.

7 Page: 7 WMNL StandardPurpose IEEE SCC41 下世代無線頻寬管理系統 IEEE 802.22 結合數位電視頻道 (TV channel) 之感知無線通訊系統 IEEE 802.11k 開發 Wi-Fi 系統具備量測、回報、與辨識之頻寬使用 IEEE 802.11y 於 3650-3700MHz 頻帶之競爭式感知無線通訊協定 IEEE 802.16h 支援 WiMAX 系統使用免執照 (License-exempt) 之通訊協定

8 Page: 8 WMNL  Multichannel advantages over single-channel  Reduce interference among users  Increased network throughput  Reduce the number of CRs affected by the return of PU  Distributed controlled advantages over centrally controlled  Reduces infrastructure cost  Providing larger flexibility  Providing larger robustness

9 Page: 9 WMNL  Recently, some MMAC-CRs have been proposed.  Focused on CR performance rather than on protection of the Pus  Not consider missed detections and false alarm  Not consider energy efficiency  Not handled the Hidden PU problem  Require tight synchronization  Focuses on single-hop networks PU A A B B C C Detectability Range

10 Page: 10 WMNL  Proposes a distributed multichannel MAC protocol for CR networks.  Improve performance  Protect the PUs from interference  Decrease the energy cost  Only requires less tight synchronization  Multi-hop

11 Page: 11 WMNL Introduction Conclusion Multichannel MAC protocol for CR networks (MMAC-CR) Multichannel MAC protocol for CR networks (MMAC-CR) Performance Evaluation

12 Page: 12 WMNL  C+1 channels are available for use  None of these channels overlap  One of the channels is a Common Control Channel (CCC)  This channel is free of PU interference  All radios are assumed to have an interface  The interface is capable of dynamically switching their channel  Dedicated for sensing purposes  Communicating and sensing can be done in parallel on different channels

13 Page: 13 WMNL ATIM Window (Fast Scan) DATA Window (Fine Scan) BEACON SRP Control Channel ATIM ATIM-ACK DATA ACK Beacon Interval Licensed Channels 123456123456 ATIM-RES RTS CTS

14 Page: 14 WMNL ATIM Window (Fast Scan) DATA Window (Fine Scan) BEACON Control Channel Beacon Interval Licensed Channels 123456123456

15 Page: 15 WMNL E E 00:03 B B F F 00:01 D D 00:02 H H 00:03 C C 00:01 A A 00:02 I I G G 00:01

16 Page: 16 WMNL E E 00:03 B B F F 00:01 D D 00:02 H H 00:03 C C 00:01 A A 00:02 I I G G 00:01 00:02 00:01

17 Page: 17 WMNL ATIM Window (Fast Scan) DATA Window (Fine Scan) BEACON Licensed Channels Control Channel Beacon Interval Initialization Update 123456123456

18 Page: 18 WMNL ATIM Window (Fast Scan) DATA Window (Fine Scan) BEACON Control Channel Beacon Interval Update Initialization Licensed Channels 123456123456

19 Page: 19 WMNL ATIM Window (Fast Scan) DATA Window (Fine Scan) BEACON Control Channel Beacon Interval Initialization Update Licensed Channels 123456123456

20 Page: 20 WMNL Spectral Image of Pus (SIP) Channel 123456 A B C D E F 0 ： No PU is active 1 ： A PU is active 2 ： The spectral image is uncertain A Ch1 Ch4 B C D F E 100000 200000 100000 100100 000100 000100

21 Page: 21 WMNL ATIM Window (Fast Scan) DATA Window (Fine Scan) BEACON SRP Control Channel Beacon Interval Licensed Channels 123456123456 Scan Result Packet

22 Page: 22 WMNL Spectral Image of Pus (SIP) Channel 123456 A Ch1 Ch4 B C D F E A 100000 B 200000 C 100000 D 100100 E 000100 F 000100 [ 0,1,1,1,1,1 ] [ 0,1,1,0,1,1 ] [ 1,1,1,0,1,1 ] [ Ch1,Ch2,Ch3,Ch4,Ch5,Ch6 ] Spectral Opportunities

23 Page: 23 WMNL Spectral Image of Pus (SIP) Channel 123456 A Ch1 Ch4 B C D F E SRP 123456 Time A 100000 B 200000 C 100000 D 100100 E 000100 F 000100 A 100000 E 000100 F 000100 [ 0,1,1,1,1,1 ] [ 0,1,1,0,1,1 ] [ 1,1,1,0,1,1 ] [ 0,1,1,0,1,1 ] [ Ch1,Ch2,Ch3,Ch4,Ch5,Ch6 ] Spectral Opportunities

24 Page: 24 WMNL Spectral Image of Pus (SIP) Channel 123456 A Ch1 Ch4 B C D F E A 100000 B 200000 C 100000 D 100100 E 000100 F 000100 [ 0,1,1,1,1,1 ] [ 0,1,1,0,1,1 ] [ 1,1,1,0,1,1 ] [ Ch1,Ch2,Ch3,Ch4,Ch5,Ch6 ] Spectral Opportunities [ 0,1,1,0,1,1 ]

25 Page: 25 WMNL ATIM Window (Fast Scan) DATA Window (Fine Scan) BEACON SRP Control Channel ATIM ATIM-ACK Beacon Interval Licensed Channels 123456123456 ATIM-RES

26 Page: 26 WMNL A Ch1 Ch4 B C D F E [ 0,1,1,1,1,1 ] [ 0,1,1,0,1,1 ] [ 1,1,1,0,1,1 ] [ 0,1,1,0,1,1 ] [ Ch1,Ch2,Ch3,Ch4,Ch5,Ch6 ] Spectral Opportunities Hidden region of C Hidden region of D

27 Page: 27 WMNL C D [ 0,1,1,0,1,1 ] [ Ch1,Ch2,Ch3,Ch4,Ch5,Ch6 ] Spectral Opportunities ATIM[0,1,1,0,1,1]ATIM-ACK (Ch2)ATIM-RES (Ch2) A B F E [ 0,1,1,1,1,1 ] [ 1,1,1,0,1,1 ]

28 Page: 28 WMNL C D [ 0,1,1,0,1,1 ] [ Ch1,Ch2,Ch3,Ch4,Ch5,Ch6 ] Spectral Opportunities ATIM[0,1,1,0,1,1] Secondary users Channel Load (SCL) Channel 123456 A B C D E F 00000 00000 0000 0000 00000 00000 ATIM-ACK (Ch2)ATIM-RES (Ch2) A B F E [ 0,1,1,1,1,1 ] [ 1,1,1,0,1,1 ] 00000 00000 0000 0000 00000 01000 10000 10000 0000 0000 00000 01000

29 Page: 29 WMNL Secondary users Channel Load (SCL) Channel 123456 A B C D E F 10000 10000 0000 0000 00000 01000 C D [ 0,1,1,0,1,1 ] [ Ch1,Ch2,Ch3,Ch4,Ch5,Ch6 ] Spectral Opportunities ATIM[1,1,1,0,1,1] ATIM-ACK (Ch1)ATIM-RES (Ch1) A B F E [ 0,1,1,1,1,1 ] [ 1,1,1,0,1,1 ] Ch2

30 Page: 30 WMNL ATIM Window (Fast Scan) DATA Window (Fine Scan) BEACON SRP Control Channel ATIM ATIM-ACK Beacon Interval Licensed Channels 123456123456 ATIM-RES DATA ACK RTS CTS

31 Page: 31 WMNL Spectral Image of Pus (SIP) Channel 123456 A B C D E F 0 ： No PU is active 1 ： A PU is active 2 ： The spectral image is uncertain A Ch1 Ch4 B C D F E 100000 200000 100000 100100 000100 000100

32 Page: 32 WMNL ATIM Window (Fast Scan) DATA Window (Fine Scan) BEACON SRP Control Channel ATIM ATIM-ACK Beacon Interval Licensed Channels 123456123456 ATIM-RES

33 Page: 33 WMNL ATIM Window (Fast Scan) DATA Window (Fine Scan) BEACON SRP Control Channel ATIM ATIM-ACK Beacon Interval Licensed Channels 123456123456 ATIM-RES

34 Page: 34 WMNL Packet Type PriorityBackoff Time ATIM Window (Fast Scan) DATA Window (Fine Scan) BEACON SRP Control Channel ATIM ATIM-ACK Beacon Interval ATIM-RES BEACON SRP ATIM ATIM-ACK ATIM-RES Beacon SRP ATIM Handshakes High Low [0, CW / 2) [CW / 2, CW)

35 Page: 35 WMNL F B G E J CA KI H D L Ch1 Ch2 SRP A I H

36 Page: 36 WMNL F B G E J CA KI H D L Ch1 Ch2 SRP A I H 11 1 1 1 1 1,2 Ch2

37 Page: 37 WMNL F B G E J CA KI H D L Ch1 Ch2 SRP A I H 11 1 1 1 1 1,2 ATIM-RES (Ch2) ATIM ATIM-ACK (Ch2) K SRP

38 Page: 38 WMNL F B G E J CA KI H D L Ch1 Ch2 SRP A I H 11 1 1 1,2 ATIM-RES (Ch3) ATIM ATIM-ACK (Ch3) K SRP

39 Page: 39 WMNL ATIM Window (Fast Scan) DATA Window (Fine Scan) BEACON SRP Control Channel ATIM ATIM-ACK Beacon Interval Licensed Channels 123456123456 ATIM-RES DATA ACK RTS CTS

40 Page: 40 WMNL ATIM WindowDATA Window A ATIM Window B C Time BEACON ATIM ATIM-ACK DATA ACK Doze State ATIM-RES RTS CTS B C A C

41 Page: 41 WMNL Introduction Conclusion Multichannel MAC protocol for CR networks (MMAC-CR) Multichannel MAC protocol for CR networks (MMAC-CR) Performance Evaluation

42 Page: 42 WMNL Simulation Parameters Simulatorns-2 (version 2.29) Datarate24Mbps CWmin15 CWmax1023 SIFS 16  s t ATIM 10ms t BI 100ms Fast sensing1ms Fine sensing25ms CRs deploymentRandomly PNs deploymentRandomly

43 Page: 43 WMNL Power Table of IMEC SDR AnalogDigital  Doze0mW10mW Idle (Fast Sensing) 120mW11mW131mW Receive (Fine Sensing) 120mW370mW490mW Transmit600mW300mW900mW

44 Page: 44 WMNL Performance metrics Channel Vacate Time Total Interference Time Time and Energy Spent Througuput

45 Page: 45 WMNL Single-hop Scenario Parameter 4 PNs 20 CRs (10 are communicating) CRs sending 150 packet/s 5 channel 80m  80 m

46 Page: 46 WMNL Single-hop PU channel statesCR channel states

47 Page: 47 WMNL Single-hop Channel Vacate TimeTotal Interfered Time

48 Page: 48 WMNL Single-hop Time and Energy cost

49 Page: 49 WMNL Single-hop CR Performance

50 Page: 50 WMNL Multi-hop Scenario Parameter 4 PNs 2 traffic streams (150 packet/s) Interference range 350m 5 channel 500m  500 m

51 Page: 51 WMNL Multi-hop Channel Vacate TimeTotal Interfered Time

52 Page: 52 WMNL Introduction Conclusion Multichannel MAC protocol for CR networks (MMAC-CR) Multichannel MAC protocol for CR networks (MMAC-CR) Performance Evaluation

53 Page: 53 WMNL  Proposes a distributed multichannel MAC protocol for CR networks.  Improve performance  Protect the PUs from interference  Decrease the energy cost  Only requires less tight synchronization  Multi-hop

54 Page: 54 WMNL

55 Page: 55 WMNL

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