1. [Distributed Sensing for Active 2 Set Channels]
Month Year
doc.: IEEE yy/xxxxr0
Oct 2006
[Distributed Sensing for Active 2 Set Channels]
IEEE P Wireless RANs Date:
Authors:
Notice: This document has been prepared to assist IEEE 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
Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures 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 Working Group 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
Carl R. Stevenson 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 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at
ETRI

2. Introduction to Distributed Sensing
Month Year
doc.: IEEE yy/xxxxr0
Oct 2006
Introduction to Distributed Sensing
Distributed Sensing
Distributed Sensing scheme yields more reliable incumbent detection through cooperation of BS and all CPEs.
Under distributed sensing operation, all CPE and BS should participate cooperative sensing not only their used channel (Active 1 set) but also other user’s used channel (Active 2 set)
Basic assumption for this distributive sensing scheme is that BS and CPE have separate sensing receiver.
All the current communication channels (i.e., Active Channel Set 1 and 2) have differently aligned QP in time.  Distributed QP
ETRI

3. Month Year
doc.: IEEE yy/xxxxr0
Oct 2006
Distributed Sensing
This scheme is proposed to support the better Incumbent protection as included in FRD
A quotation from FRD (Sec )
ETRI

4. Down Stream Beam Pattern of CH 1 Can’t detect Hidden Node
Month Year
doc.: IEEE yy/xxxxr0
Oct 2006
Hidden Node Problem
Down Stream Beam Pattern of CH 1 BS
CPE 1
Active1 Set:CH1
Active2 Set:CH2,3
CH1
Can’t detect Hidden Node
Local Interferer in CH 1
Wireless Microphone
CH1
CH2
CPE1
IU protection Fail
due to the Hidden Node
CH 3
CPE 4
Active1 Set:CH3
Active2 Set:CH1,2
CPE2
CPE3
CPE4
Therefore, it is needed not only Active set2 sensing but also Active set1 sensing
ETRI

5. When BS and CPE sense Active 2 set?
Month Year
doc.: IEEE yy/xxxxr0
Oct 2006
When BS and CPE sense Active 2 set?
In order to sense Active 2 set properly
During a channel’s QP, the host of the channel senses its Active 1 Set. Also, others sense the same channel as a sensing of Active 2 Set and report their sensing results to BS.
Thus, BS has N sensing results for the active channels, where N is the number of active CPEs in BS.
To sense the Active 2 Set, it is needed that all CPEs and BS should know the other channel’s QP positions (QP synchronization discussed slide 12).
ETRI

6. Possible QP assign scenarios
Month Year
doc.: IEEE yy/xxxxr0
Oct 2006
Possible QP assign scenarios
Simultaneous QP in the same cell
Distributed QP
Active1 sensing
Active1 sensing
Active2 sensing
Active2 sensing
CH 1
CH 1
CH 2
CH 2
CH 3
CH 3 QP
ETRI

7. Possible QP assign scenarios
Month Year
doc.: IEEE yy/xxxxr0
Oct 2006
Possible QP assign scenarios
Drawbacks of Simultaneous QP
Active1 sensing
Active2 sensing
-long QPs are needed
-There are sensing redundancy
CH 1
CH 2
CH 3
Additionally required QP
Minimum required QP to sense a channel
ETRI

8. Possible QP assign scenarios
Month Year
doc.: IEEE yy/xxxxr0
Oct 2006
Possible QP assign scenarios
Simultaneous QP
Distributed QP
Remove somewhat duplicate information.
CH 1
CH 1
CH 2
CH 2
CH 3
CH 3
-Additional QPs are needed
-There are sensing redundancy
-Enhanced Throughput
Minimum required QP to sense a channel
ETRI

9. Additional features of Distributed QP
Month Year
doc.: IEEE yy/xxxxr0
Oct 2006
Additional features of Distributed QP
Self-interference free sensing
In the vicinity of Cell or Sector, it is required QP information for occupied by other WRAN channels (i.e., Active 2 set) to sense without self interference. This yield more accurate sensing for other active 2 sets.
QP synchronization needs channel list for all BS and CPE
Current Draft v.0.1 can support the channel list.
Therefore, WRAN enable QP synchronization. Based on the QP synchronization, WRAN more efficiently sense without self interference by using the proposed distributed QP scheme.
ETRI

10. Single Channel 3 Sectors Case
Month Year
doc.: IEEE yy/xxxxr0
Oct 2006
Single Channel 3 Sectors Case BS
CH1
CH2
CH1
CH2
CPE1
CPE2
CPE3
Sense during the CH2’s QP
CPE4
To give more information for CH2, CH1’s CPE should sense to CH2 during the CH2’2 QP
ETRI

11. Single Channel Overlap Cell Situation
Month Year
doc.: IEEE yy/xxxxr0
Oct 2006
Single Channel Overlap Cell Situation
BS1
BS2
CH2
CH2
CH1
CPE1
CPE3
Sense during the CH2’s QP
CPE4
CPE2
To give more information to BS 1, CH1’s CPE should sense to CH2 during the CH2’2 QP
ETRI

12. Refer the joint proposal
Month Year
doc.: IEEE yy/xxxxr0
Oct 2006
QP Synchronization
Quiet Periods Synchronization
To support multiple channels transmission, BS would employ a Spectrum Manager
All channel information in the cell should report to SM (Spectrum Manager)
A BS’s all MAC write SCH every super frame duration under the control of SM
This SM control messages are delivered by periodic or aperiodic manner
Therefore all QPs in the same cell are synchronized under the control of SM
Refer the joint proposal
ETRI

13. Month Year
doc.: IEEE yy/xxxxr0
Oct 2006
Conclusions
QPs should be allocated in different time slot between active channels to be sensed.
Proposed distributed QP support more information to protect incumbent users
Also, distributed QP yield more efficient sensing without self-interference
ETRI