1. doc.: IEEE 802.22-07/0521r0 Submission November 2007 Gwangzeen Ko, ETRISlide 1 Channel Set Management IEEE P802.22 Wireless RANs Date: 2007-11-07 Authors: Notice: This document has been prepared to assist IEEE 802.22. 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 802.22. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures http://standards.ieee.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 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 Chairhttp://standards.ieee.org/guides/bylaws/sb-bylaws.pdf Carl R. StevensonCarl 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 802.22 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at patcom@iee.org.patcom@iee.org >

2. doc.: IEEE 802.22-07/0521r0 Submission November 2007 Gwangzeen Ko, ETRISlide 2 Abstract Proposed channel classification scheme, namely channel set management, is devised in order to efficiently manage the WRAN’s operating channels depending on channel occupancy status. This presentation addressed definition of channel set, structure of management messages, and several advantage of channel set management.

3. doc.: IEEE 802.22-07/0521r0 Submission November 2007 Gwangzeen Ko, ETRISlide 3 Contents The Objects of Channel Set Management Motivation of Channel Set Management Difference between Sensing and Channel Set Management Definition of Channel Set Channel Set Decision Input and Output Parameters for Data Fusion Interfaces

4. doc.: IEEE 802.22-07/0521r0 Submission November 2007 Gwangzeen Ko, ETRISlide 4 Motivation of channel set management In FRD [1], the procedure about the channel set management is clearly required –Section 15.1.4 Channel Utilization Table The system SHALL provide a way to populate a table of channels that characterizes channel availability – such as disallowed, occupied, available, available at reduced power, etc., and to update that table at any time. Disallowed channels SHALL not be used and therefore will not need to be sensed by the system. Updating of the table MAY occur either as a result of data entry by a system operator or as an automatic function of the network sensing mechanism, which will result in non disallowed channels being designated as either occupied, available, available at reduced power, etc. Such automatic updating by the sensing mechanism SHALL operate utilizing parameters as specified in section 15.1.2. The base station, and optionally the CPEs, SHOULD maintain a "list" of backup channel(s) in case a new incumbent is detected and a channel has to be quickly vacated. The exact scheme can be left to the proposers, as different approaches could be suggested to address this issue. –Section 15.2.4 Channel Utilization Database Each 802.22 WRAN base station (and optionally CPEs) SHALL maintain a table of frequencies used by other WRAN systems operating in the same geographic area, and SHALL use that information to facilitate sharing, coexistence, and interference mitigation amongst neighbors.

5. doc.: IEEE 802.22-07/0521r0 Submission November 2007 Gwangzeen Ko, ETRISlide 5 The Objects of channel set management The channel set management was designed in the following objects. –To sense the channels more efficiently Can employ channel group (similar characteristics) management Allowed CPE intelligence for sensing, when CPE have no BS orders –To reduce the CPE initial access time Based on Channel set history, a CPE can find SCH faster than full sensing. –To improve the system throughput If quality (e.g., SNR) of the first backup channel better than operating channel. Then WRAN can switch the both channel to improve the system throughput

6. doc.: IEEE 802.22-07/0521r0 SubmissionSlide 6 Spectrum vs. Channel Set Management The main difference between spectrum and channel set management is consideration of sensing requirements Channel set management is a part of sensing management. Spectrum Management WRAN Operating Channel CH # NCH # N+1CH # N-1 Channel Set Management CH # NCH # N+1CH # N-1 Empty Channel Empty Channel Considering of Sensing requirements -Power leakage -Quiet Period -Sensing Threshold Conceptual Spectrum Usage -No sensing requirements To sense the first adjacent channels, quiet periods are needed due to power leakage from channel N Therefore, these channel are considered as parts of operating channel. Conceptually Uncorrelated Correlated WRAN Operating Channel Empty But related with Operating channel November 2007 Slide 6 Gwangzeen Ko, ETRI

7. doc.: IEEE 802.22-07/0521r0 Submission November 2007 Gwangzeen Ko, ETRISlide 7 Definition of the channel sets Presently, in the Draft v.0.39, the following channel sets are defined. –Active set: a set of channels being used by WRAN systems Active set 1: a set of channels being used by BS and CPEs Active set 2: a set of channels being used by other CPEs or BSs –Candidate/Backup set: a set of clean channels available for a certain BS or CPE –Occupied set: a set of occupied channels by incumbent user which a certain CPE finds –Disallowed Set: a set of channels whose access are not allowed by regulation –Null set: a set of channels that are not classified as one of above five sets

8. doc.: IEEE 802.22-07/0521r0 Submission November 2007 Gwangzeen Ko, ETRISlide 8 Definition of the channel sets Slide 8  Transition diagram for channel set  The channel in null, active or candidate set becomes a member of occupied set as incumbent user appears.  Incumbent service releases the channel and its quality is better than an existing member of the candidate set, then it is classified as a member of candidate set.  Incumbent service releases the channel and its quality is worse than all member of the candidate set, then it is classified as a member of null set.  If the channel quality is better than an existing member of the candidate set, then it replaces the member of candidate set.  The channel becomes active by new allocation to a WRAN service.  The poorest channel in candidate set goes to a member of null set as its quality is worse than a new member of candidate set, which comes from null(4), active(7) or occupied(2) sets  The channel is released due to the termination of its usage and its quality is better than an existing member of the candidate set.  The channel is classified as a member of null set as the WRAN service releases the channel and its quality is worse than all member of the candidate set. Null Set Active Set Occupied Set Candidate Set 1 1 2 75 8 4 6 1 3

9. doc.: IEEE 802.22-07/0521r0 Submission November 2007 Gwangzeen Ko, ETRISlide 9 Definition of the channel sets In [2], the following channel sets was suggested as the modified version of previous slide. 1- Precluded channels for incumbent and WRAN operation e.g., ch. 37, >52 by regulation, etc. no need to sense, no transmit 2- Disallowed channels forced by operator or from database or regulation No transmit but sensing may be needed Permanent 3- Current operating channel N (WRAN transmits) 4- Backup channels ordered list No transmit, sensing required declared as clear by BS 5- Candidate channels additional channels that the BS asks the CPE to sense 6- Occupied channel Incumbents found on this channel from sensing and: temporary occupied or WRAN operation sensing needs to be regularly sensed 7- Unclassified channels any other channels not sensed yet

10. doc.: IEEE 802.22-07/0521r0 SubmissionSlide 10 Definition of the channel sets Relation between definitions BS(CPE) initialization StageDuring BS operation November 2007 Slide 10 Gwangzeen Ko, ETRI

11. doc.: IEEE 802.22-07/0521r0 Submission November 2007 Gwangzeen Ko, ETRISlide 11 Channel Set Decision Two step channel decision By Geo-location and Sensing By WRAN Channel Management

12. doc.: IEEE 802.22-07/0521r0 SubmissionSlide 12 How to classify the Channel Set ? “Channel set decision policy(CSDP)”, located in SME, takes care of entire channel set decision and update management procedure. If CSDP needs sensing results or location information, CSDP directly control measurement and Geo-location blocks. CSDP is considered as a part of “channel management policy” function November 2007 Slide 12 Gwangzeen Ko, ETRI

13. doc.: IEEE 802.22-07/0521r0 SubmissionSlide 13 Data Fusion: Input and Output Parameters Channel Set Update Policy Inputs Last updated time Channel number Channel Set ID Outputs Update time Channel number Channel Set ID Measurement Policy Refer Inputs/Outputs of SSF Geo-Location Policy TBD November 2007 Slide 13 Gwangzeen Ko, ETRI

14. doc.: IEEE 802.22-07/0521r0 SubmissionSlide 14 November 2007 Slide 14 Gwangzeen Ko, ETRI How to manage channel set between SM and SA (1) CPE receives SM(BS) through DCD and MAC message such as CHO-UPD, during initialization. CPE CH Set #N Active Set Occupied Set Candidate/ Backup Set Null Set Disallowed set CPE CH Set #1 Active Set Occupied Set Candidate/ Backup Set Null Set Disallowed set BS CH Set #1 Active Set Occupied Set Candidate/ Backup Set Null Set Disallowed set... (3) Based on each CPE’s sensing information and other information (Incumbent database and so on), BS decides master CSL (4) BS transmits to CPE’s SM and CPE override on the last CSL CPE CH Set #1 Active Set Occupied Set Candidate/ Backup Set Null Set Disallowed set BS CPE (2) CPE reports sensing results to BS 2 3 1 4

15. doc.: IEEE 802.22-07/0521r0 SubmissionSlide 15 Management Interface: MAC to MAC Channel Set information can be conveyed by related MAC management massages which is defined in current Draft. Relation between MAC messages and channel set are as followed MessageFieldInformationNote SCH TxID, CN, NC Active set DCD Channel Number for BackupCandidate/Backup set Number of Channels for Backup CHO-UPD (Channel Occupancy Update) Channel number and channel state Occupied set Other channels are not clearly defined in current Draft. November 2007 Slide 15 Gwangzeen Ko, ETRI

16. doc.: IEEE 802.22-07/0521r0 SubmissionSlide 16 Management Interface: SM-SA To convey channel set information to CPE, modification of current CHO-UPD message is needed. CHO-UPD SyntaxSizeNotes CHO-UPD_Message_Format() { Management Message Type = 518 bits Transaction ID16 bits Starting Channel Number8 bits Number of Channels8 bits for (i = 1; i  Number of Channels; i++) { Channel State3 bitsTable 144 } Padding Nibble } ValueState 000Unmeasured 001Vacant 010Occupied 011Occupied by TV service 100Occupied by Part 74 service 101Occupied by 802.22 110~111Reserved Channel State information November 2007 Slide 16 Gwangzeen Ko, ETRI

17. doc.: IEEE 802.22-07/0521r0 Submission Channel Set Management Procedure Channel state information (Modified) ValueSetsState 0000NullUnmeasured 0001Nullvacant 0010OOccupied 0011OOccupied by TV service 0100OOccupied by Part 74 service 0101A2Occupied by other 802.22 0110A1Occupied by intra 802.22 0111xTBD 1000xTBD 1001xTBD 1010DPreclude or Disallowd 1011xTBD 1100Reserved 1101Reserved 1110~1111Reserved November 2007 Slide 17Gwangzeen Ko, ETRI

18. doc.: IEEE 802.22-07/0521r0 Submission November 2007 Gwangzeen Ko, ETRISlide 18 References 1)22-05-0007-47-0000 RAN Requirements 2)22-07-0466-00-0000 Channel Sets Status 3)22-07-0467-00-0000 Channel Sets Gerald Suggestions