TV White Space Coexistence Scenario based on Channel Availability September 2009 TV White Space Coexistence Scenario based on Channel Availability Date: 2009-09-24 Authors: Notice: This document has been prepared to assist IEEE 802.19. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.19. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures <http:// ieee802.org/guides/bylaws/sb-bylaws.pdf>, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the TAG of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair <shellhammer@ieee.org> as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.19 TAG. If you have questions, contact the IEEE Patent Committee Administrator at <patcom@ieee.org>. Hyunduk Kang et al, ETRI

Channel Availability (1/2) September 2009 Channel Availability (1/2) FCC report and order designates possible TV bands for fixed or portable/personal TVBDs and networks Channel availability shows how many TV bands are available for coexisting TVBDs and networks 4 5 2 3 20 21 22 36 37 38 51 Disallowed Allowed Allowed but more stringent emission mask is needed Possible channels for fixed TVBDs Possible channels for portable/personal TVBDs Hyunduk Kang et al, ETRI

Channel Availability (2/2) September 2009 Channel Availability (2/2) Channel availability might be locally different based on; Incumbent activity Type of TVBDs Fixed TVBDs: No adjacent channel use Portable/Personal TVBDs: Adjacent channel use is possible with limited transmit power Number of activating TVBDs (or networks) Usable channel for TVBDs (or networks) includes Free channel No incumbent activity No TVBDs activity Occupied channel by other TVBDs (or networks) Figure’s copied from [1] Hyunduk Kang et al, ETRI

Scenarios M available channel out of N ( ) networks September 2009 Scenarios M available channel out of N ( ) networks : scenario 1 (Sufficient channel availability) : scenario 2 (Deficient channel availability) : scenario 3 (Single channel availability) Hyunduk Kang et al, ETRI

Scenario 1: Sufficient Channel Availability September 2009 Scenario 1: Sufficient Channel Availability M available channel out of N networks ( ) Each network operates on its own TV channel at the same time No self or inter-system coexistence problem on each channel Coexistence problems Fairness among N networks One channel per network, NO problem! Possible coexistence mechanisms for channel allocation FDM (entire one channel use) might be perfect enough! 802.22 802.16 802.15 TV channels 802.11 Slide 5 Hyunduk Kang et al, ETRI

Scenario 2: Deficient Channel Availability September 2009 Scenario 2: Deficient Channel Availability M available channel out of N networks ( ) All networks can NOT operate on their own TV channels at the same time Self or inter-system coexistence problem Coexistence problems Fairness among N networks Channel utilization goal = M/N Possible coexistence mechanisms for channel allocation and co-channel sharing FDM (sub-channel, i.e., partial channel, use) Combination of TDM (or CDM) and FDM Can select which network coexists with which one 802.22 802.16 802.15 TV channels 802.11 Slide 6 Hyunduk Kang et al, ETRI

Scenario 3: Single Channel Availability September 2009 Scenario 3: Single Channel Availability Single available channel out of N networks N networks operate on single co-channel at the same time Self or inter-system coexistence problem A subset of scenario 2 Coexistence problems Fairness among N networks Channel utilization goal = 1/N Possible coexistence mechanisms for co-channel sharing TDM (entire channel use) FDM (sub-channel, i.e., partial channel, use) CDM (entire channel use) 802.22 802.16 802.15 TV channels 802.11 Hyunduk Kang et al, ETRI

Coexistence Mechanisms for TVWS September 2009 Coexistence Mechanisms for TVWS Channel allocation To allocate a channel to a new network Two cases Allocate free channel Allocate pre-occupied channel by other networks Co-channel sharing To share an operating channel with other existing networks The channel has the same or similar TVWS networks Self-coexistence mechanism might be needed The channel has dissimilar TVWS networks Inter-system coexistence mechanism might be needed Slide 8 Hyunduk Kang et al, ETRI

Channel Allocation based on Scenario 2 September 2009 Channel Allocation based on Scenario 2 Two stage channel allocation for a new TVBD network Step 1: allocate the channel being used by the same or similar class of networks Full or partial coexistence without cooperation is possible Mechanism for self-coexistence could be applicable Step 2: allocate the channel being used by dissimilar class of networks Coexistence require cooperation Mechanism for inter-system coexistence might be required 802.22 802.16 802.15 802.11 TV channels Slide 9 Hyunduk Kang et al, ETRI

September 2009 Reference [1] Richard Paine et al, Whitespace Coexistence Use Cases, IEEE 802.19-09/026r4, July 2009 Hyunduk Kang et al, ETRI