1. Sensing Manager Authors: IEEE P802.22 Wireless RANs Date: 2008-03-11
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Liu Jinnan Huawei Hisi

2. ABSTRACT
We give a contribution about unsolved functions in Spectrum Manager and propose Sensing Manager to implement those functions.
Liu Jinnan Huawei Hisi

3. The functions of Spectrum Manager at BS may include:
Background
The functions of Spectrum Manager at BS may include:
Data collection and fusion [1]
Channel management [1] [2]
Self-coexistence and spectrum sharing [1] [2]
Control of spectrum sensing [2]
TPC [2]
Liu Jinnan Huawei Hisi

4. Self-coexistence and spectrum sharing
Previous Work
Channel manager
Channel classification
Channel switch procedure (with backup channel)
Self-coexistence and spectrum sharing
CBP
Spectrum sharing mechanism
Exchange measurement report in overlap area [3]
TPC
Liu Jinnan Huawei Hisi

5. To do the unsolved functions of Spectrum Manager in previous works
Sensing Manager
Sensing Manager
To do the unsolved functions of Spectrum Manager in previous works
Data collection and fusion
Channel Set Status (without backup channel)
Control of Spectrum sensing
Channel set status dissemination
Liu Jinnan Huawei Hisi

6. Functions of Spectrum Manager
Incumbent History is a static record to reflect incumbent occupancy from historical data of one month/year of sensing results and incumbent database.
Data collection
Sensing manager would collect information from Geolocation, SSF, Incumbent History, Incumbent Database, Operator and Regulation.
Channel information related with current WRAN system and neighbor WRAN systems may be obtained from channel manager and coexistence manager respectively.
Data fusion
Firstly, to fuse same signal source from different data sources, and to distinguish different signal sources from same or different data sources.
And then, to store the multiple signal sources, even in one channel.
Finally, to form a channel set status.
Data dissemination
According to the channel set status, channel manager would do channel switching ,such as operation channel switching or backup channel maintaining.
While coexistence manager would share spectrum with neighbor WRAN, for example , borrowing channel from neighbor WRAN.
And Power control manager would control transmit power by sensing manager’s assignment.
Sensing Manager also would schedule dynamic sensing based on channel set status.
Liu Jinnan Huawei Hisi

7. Table 160—Channel state information
Value
State
000
Unmeasured
001
vacant
010
Occupied
011
Occupied by TV service
100
Occupied by wireless microphones
101
Occupied by
110~111
Reserved
Assumption:
1)Channel state is either vacant or occupied if it is measured.
2)Channel state is occupied by one kind of signal source.
Assumption:
Channel state is either vacant or occupied if it is measured.
Channel state is occupied by one kind of signal source.
Liu Jinnan Huawei Hisi

8. Data fusion
How to fuse?
Is it possible that the same channel is occupied by different signal sources at same time?
Yes (location dependent )
Is it beneficial to distinguish interfered status from occupied status ?
Yes( the interfered status is related with the occupied status, not independent )
sys2
sys1
WRAN BS
Case1 : Both sys1 and sys2 work on channel K
Case 2: Sys1 works on channel K, and sys2 works on channel K-1 but channel K is constrained.
Case 3:Sys1 works on channel K, and sys2 works on channel K-1 but channel K is non-constrained
Liu Jinnan Huawei Hisi

9. Proposed rules for data fusion
One channel would be saved as multiple channel statuses which are related with different signal sources
different signal type (signal type known)
different location
The channel status distinguishes “interfered” status from other channel statuses.
High (such as adjacent)
Media (such as Inter modulation)
Others (such as non-identification signal )
Liu Jinnan Huawei Hisi

10. Selected by channel manager
Disallowed (quasi- static)
Forbidden
Occupied by incumbent
Allowed (dynamic)
Occupied (by incumbents, current WRAN, Neighbor WRANs)
Interfered
Free backup channel
others
Selected by channel manager
Liu Jinnan Huawei Hisi

11. Conclusion
To build a channel status list with multiple signal sources in one channel
To avoid confusion, different signal sources would be stored respectively instead of fusion as one signal source in one channel.
To distinguish “interfered “ status
To decrease measurement resource consumption, the interfered status refreshes channel status according to occupied status
WRAN may take usage of interfered channel with acceptable interference
Liu Jinnan Huawei Hisi

12. References [1] IEEE 802.22-07/0457-r0 Outline of Sec9 , Sept. 2007
[2] IEEE /0456r1 Spectrum Manager 9.1, Sept. 2007
[3] IEEE /0316r0 Forward Coexistence Measurement Report To Neighbor, July, 2007
[4] IEEE /0412r0 Dynamic sensing, Sept. 2007
Liu Jinnan Huawei Hisi

13. other functions of sensing manager
Liu Jinnan Huawei Hisi

14. Control of Spectrum sensing
To confirm channel status for double check
To maintain the channel status list
Dynamic sensing [4]
The status of Interfered channel is dependent on the occupied status. If the signal source release the occupied status, the status of interfered channel would be changed. So we mention dynamic sensing about occupied channel instead of interfered channel plus occupied channel.
Liu Jinnan Huawei Hisi

15. Channel set status dissemination
Channel manager
Backup channel selection
Coexistence manager
Spectrum sharing
Power Control manager
Power constraints
Liu Jinnan Huawei Hisi