1. TV White Space Coexistence Scenario based on Channel Availability
September 2009
TV White Space Coexistence Scenario based on Channel Availability
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Hyunduk Kang et al, ETRI

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

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