1. Dynamic sensing schemes
IEEE P Wireless RANs
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Liu Jinnan Huawei Hisi

2. ABSTRACT
We give a contribution about how the WRANs do dynamic sensing schemes to save the system resource.
Liu Jinnan Huawei Hisi

3. Background In-band sensing is a two-stage sensing mechanism [1]
Intra-frame QPs are set to do fast sensing periodic
Inter-frame QPs are set to do fine sensing driven by outcome of fast sensing
Out-band sensing is something like
Periodic?
Non-periodic ?
Dynamic?
Liu Jinnan Huawei Hisi

4. Overall System Architecture [2]
Higher Layers (IP, ATM, 1394 etc)
Overall System Architecture [2]
Incumbent
Database
Regulation and
Operational
considerations
Spectrum
Manager
PHY
Convergence
Sub-layer/Bridge
MAC Common part
SSF
Geo
location
PHY
MAC SM
SSF
Geo
location
PHY
MAC SM
SSF
Geo
location
PHY
MAC SM
SSF
Geo
location …
CPE#1
CPE#2
CPE#N
Liu Jinnan Huawei Hisi

5. To classify channel sets in SM at BS
Active set1 :used by BS itself
Active set2 :used by neighbor BSs
Occupied set: occupied by incumbent in coverage
Free set
Candidate set: used by the BS as backup channel
Potential candidate set: free channel but not in the candidate set
Not allowed set: not permit to be used by BS
(reflect the channel usage state)
Liu Jinnan Huawei Hisi

6. Incumbent Database Index: Channel Incumbent type Time Geolocation
Liu Jinnan Huawei Hisi

7. Predict incumbent type u set u feature detection on channel N
Active set1
After a fine sensing is driven by outcome of fast sensing
Incumbent detection time known
Channel No. N Known
(access database by index )
Predict incumbent type u set u feature detection on channel N
Active set2
Sensing driven by events, such as sensing request from neighbor, etc
Liu Jinnan Huawei Hisi

8. (access database by index )
Occupied set
Incumbent type known
Incumbent detection time known
Channel No. Known
(access database by index )
Predict time t of releasing channel assign dense sensing after t until free channel is detected.
Liu Jinnan Huawei Hisi

9. Free set Candidate set Potential candidate set Depend priority.
The higher priority , the shorter sensing period will be set
Potential candidate set
Sensing driven by events ,such as switch to candidate set, or sensing request from neighbor, etc.
Liu Jinnan Huawei Hisi

10. Hybrid mechanism for sensing
Conclusion
Hybrid mechanism for sensing
Take advantage both of the channel usage state and incumbent database.
Liu Jinnan Huawei Hisi

11. References
[1] IEEE P802.22™/D0.2 Draft Standard for Wireless Regional Area Networks Part 22: Cognitive Wireless RAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Policies and procedures for operation in the TV Bands
[2] Interface-MAC-Sensing
Liu Jinnan Huawei Hisi