Channel Management in IEEE 802.22 WRAN Systems

2,613 views

Published on

The first international standard in Cognitive Radio Networks is IEEE 808.22 Wireless Regional Area Networks, which uses unused TV spectrum to provide Broadband access to rural areas. This slides describes how Channel management is done in WRAN Systems.

Published in: Technology, Business
0 Comments
5 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
2,613
On SlideShare
0
From Embeds
0
Number of Embeds
978
Actions
Shares
0
Downloads
121
Comments
0
Likes
5
Embeds 0
No embeds

No notes for slide
  • Channel Management in IEEE 802.22 WRAN Systems
  • Channel Management in IEEE 802.22 WRAN Systems

    1. 1. Cognitive Radio Networks Praseetha KR
    2. 2. Channel management in IEEE 802.22 WRAN Systems
    3. 3. <ul><li>A paradigm for wireless communication </li></ul><ul><li>Avoid interference with licensed or unlicensed users </li></ul><ul><li>Transmission or reception parameters are changed by either a network or a wireless node </li></ul>Channel management in IEEE 802.22 WRAN Systems
    4. 4. Channel management in IEEE 802.22 WRAN Systems
    5. 5. Channel management in IEEE 802.22 WRAN Systems
    6. 6. Full Cognitive Radio (Every possible observable parameter) Spectrum Sensing Cognitive Radio (only RF spectrum) Licensed Band Cognitive Radio e g: IEEE 802.22 WRAN which will operate in unused television channels Unlicensed Band Cognitive Radio eg: IEEE 802.15 Task group 2 specification which focuses on the coexistence of IEEE 802.11 and Bluetooth Depending on the parts of the spectrum available Depending on the set of parameters Channel management in IEEE 802.22 WRAN Systems
    7. 7. <ul><li>Share the geographically unused TV spectrum in a rural environment to provide Broadband access </li></ul>Channel management in IEEE 802.22 WRAN Systems
    8. 8. <ul><li>Specify both PHY & MAC layer functionalities </li></ul><ul><li>Infrastructure based Broadband access </li></ul><ul><li>BS (base station) controls CPE (consumer premises equipment) </li></ul><ul><li>Operates in TV band </li></ul><ul><li>Dynamic channel management is the key feature </li></ul>Channel management in IEEE 802.22 WRAN Systems
    9. 9. Channel management in IEEE 802.22 WRAN Systems
    10. 10. Channel management in IEEE 802.22 WRAN Systems
    11. 11. Channel management in IEEE 802.22 WRAN Systems
    12. 12. <ul><li>Resource utilization </li></ul><ul><li>QoS (Quality of Service) </li></ul><ul><li>Incumbent monitoring </li></ul>Channel management in IEEE 802.22 WRAN Systems
    13. 13. <ul><li>In US, </li></ul><ul><li>Communication between BS and CPE </li></ul>Available for TV Broadcast BS Up to 255 CPE units TV channel 6-8Mhz, 17-30 km ,Half –duplex, TDMA 1.5 Mbps downstream 384 kbps upstream VHF UHF 10 channels 54-216 MHz 37 channels 470-758 MHz Channel management in IEEE 802.22 WRAN Systems
    14. 14. <ul><li>Types of incumbent user operations in TV band: </li></ul><ul><ul><ul><ul><ul><li>Analog TV </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Digital TV </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Wireless microphone </li></ul></ul></ul></ul></ul><ul><li>Guard bands </li></ul><ul><li>User protection rules by Regulatory bodies </li></ul>Channel management in IEEE 802.22 WRAN Systems
    15. 15. <ul><li>Geo-Location Database </li></ul><ul><li>Incumbent Database </li></ul><ul><li>Spectrum Sensing </li></ul>Channel management in IEEE 802.22 WRAN Systems
    16. 16. Channel management in IEEE 802.22 WRAN Systems Channel management in IEEE 802.22 WRAN Systems
    17. 17. <ul><li>The geographic location of the BS and CPE has to be known to determine the permissible channels at a given location </li></ul><ul><li>Devices find their location through Global Positioning System </li></ul>Channel management in IEEE 802.22 WRAN Systems
    18. 18. <ul><li>Maintained by Regulatory bodies in different places to keep information of licensed users </li></ul><ul><li>Should be available at no operational cost </li></ul>Incumbent Database REQUEST (Current location of BS and CPE) List of available TV channels + max Radiation power of CPE 802.22 WRAN
    19. 19. <ul><li>To detect presence of incumbent users </li></ul><ul><li>Both BS and CPE scans TV channels independently </li></ul><ul><li>SSF tunes channels & reports to SM </li></ul>Channel management in IEEE 802.22 WRAN Systems
    20. 20. <ul><li>Spectrum Manager uses a two-step channel decision process </li></ul>Channel management in IEEE 802.22 WRAN Systems
    21. 21. Channel classification start Incumbent DB exist? Available channels Is channel sensed? Decision considerations: -Empty or not -own WRAN cell used -WMP used -TV used -Other WRAN cells used -Cumulative empty time -History -Local regulatory end Disallowed Operating Backup Candidate Protected Unclassified Unavailable channels Incumbent protection requirements Channel availability? No No No Yes Yes Yes SM Incumbent db Channel Classification Procedure
    22. 22. Protected Operating Backup Candidate Disallowed Unclassified channels in which incumbent users or WRAN operations has been detected The channel currently in operation for WRAN channels that have been cleared to become the operating channel channels that are candidates to become a backup channel Channels precluded by the operator due to operational or local regulatory constraints Channels that have not yet been sensed Infrequent Every 2s Every 6s Infrequent Channels Characteristics Re-sensing time interval Channel management in IEEE 802.22 WRAN Systems
    23. 23. <ul><li>The BS and CPE should maintain same list of backup channels </li></ul><ul><li>WRAN system provides various channel list exchange information elements in the form of MAC Management messages </li></ul>Channel management in IEEE 802.22 WRAN Systems
    24. 24. <ul><li>BS  CPE </li></ul><ul><li>Embedded mode: </li></ul><ul><li>downstream channel descriptor (DCD) message </li></ul><ul><li>Explicit mode: </li></ul><ul><ul><ul><ul><li>Channel terminate request/response (CHT-REQ/RSP) </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Channel switch request/response (CHS-REQ/RSP) </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Channel quiet request/response (CHQ-REQ/RSP) </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Channel occupancy update (CHO-UPD) </li></ul></ul></ul></ul><ul><li>Between BSs </li></ul><ul><li>Using Coexistence Beacon Protocol (CBP) </li></ul>Channel management in IEEE 802.22 WRAN Systems
    25. 25. <ul><li>1 st international standard that uses Cognitive Radio technology is IEEE 802.22 WRAN standard, which is used to provide broadband access in rural areas from unused TV bands </li></ul><ul><li>The key features of WRAN are Incumbent protection and Dynamic channel management </li></ul><ul><li>Channel Classification using geo-location information, incumbent database and by spectrum sensing </li></ul><ul><li>For coexistence, channel information should be exchanged & updated between BSs and between BS & CPE </li></ul>Channel management in IEEE 802.22 WRAN Systems
    26. 26. Channel management in IEEE 802.22 WRAN Systems
    27. 27. Channel management in IEEE 802.22 WRAN Systems

    ×