1. Group Sleep Mode in IEEE 802.16m IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16m-08/591r1 Date Submitted: 2008-07-07 Source: Eunkyung Kim, Namsuk Lee, Kyung Soo KimVoice:+82-42-860-5415 ETRIE-mail:{ekkim, namsuk, kksu}@etri.re.kr 138 Gajeongno, Yuseong-gu, Daejeon, 305-700, KOREA * http://standards.ieee.org/faqs/affiliationFAQ.html Venue: IEEE 802.16 Session #56, Denver, CO, USA Base Contribution: None Purpose: To discuss and adopt the proposed text in the next revision of the 802.16m SDD Notice: This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who 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 802.16. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and.http://standards.ieee.org/guides/bylaws/sect6-7.html#6http://standards.ieee.org/guides/opman/sect6.html#6.3 Further information is located at and.http://standards.ieee.org/board/pat/pat-material.htmlhttp://standards.ieee.org/board/pat

2. Contents Grouping the Sleep Mode MSs Sleep Mode Operation Example of –Grouping of Sleep Mode MSs –Bitmap of Group Sleeping Mode Summary Proposed Text

3. Grouping the sleep mode MS Legacy sleep mode deals –Power saving class –Sleep mode MSs individually Listening to TRF_IND is overhead due to unnecessary of listening period Grouping the sleep mode MS –With same/similar traffic pattern (sleep/listening interval) –BS tells the group if the MS(s) in group should be listen or sleep with bitmap in each super-frame control signal –MS in the listening period checks the bitmap whether it should wake or not the predefined frame in the Super- frame

4. Sleep Mode Operation [Step 1] MS is ready to go to sleep mode [Step 2] MS is in sleep mode –Listens the control signal of super-frame to synchronize & check if there is traffic from/to the MS –Sleeps again after sending/receiving traffic –Sleep info. should be changed [Step 3] MS is returning to active mode

5. Sleep Mode Operation (cont’d) [Step 1] MS is ready to go to sleep mode –RSP MSG from BS makes MS enter the sleep mode with info. Listening interval –According to the traffic pattern Group ID –BS assigns it which can be shared by MSs Listening Frame in Super-frame –Pre-defined frame index in the super-frame –Small used frame index first [Example of Sleep mode opeartion]

6. Sleep Mode Operation (cont’d) [Step 2] MS is in sleep mode –Sleeps with the info Listening interval, Group ID, Listening frame –[Step 2-1] Listens in listening period along with the listening interval Listens bitmap in super-frame control signal –If the bitmap is set, MS listens in the listening frame –If the bitmap is not, MS sleeps continuously until next listening time [Example of Sleep mode opeartion]

7. Sleep Mode Operation (cont’d) [Step 2] MS is in sleep mode –[Step 2-2] Backs to sleep immediately after listening the same sleep mode info. –[Step 2-3] Sleep mode info. needs to be changed BS can notify with MOB_SLP- RSP with changed sleep mode info –listening interval, group id, & listening frame MS can request with MOB_SLP-REQ with expected sleep mode info. [Example of Sleep mode opeartion] [Step 2-2]

8. Sleep Mode Operation (cont’d) [Step 3] MS is returning to active mode –MS have some traffic to transmit –BS wake the MS in sleep mode up due to Buffer delay New traffic is coming to the MS

9. Example of Grouping the sleep mode MSs Traffic tx/rx IntervalPre-defined frame index in super-frame MS130F1 MS240F2 MS370F3 MS460F0 MS550F3 MS680F1 MS790F2 GroupMS(s)Pattern 0MS1(F1),MS4(F4),MS7(F2)30*n 1MS2(F2), MS6(F0)40*n 2MS3(F3), MS5(F3)- 3-- GroupMS(s)Pattern 0MS2(F2),MS4(F0),MS6(F4)20*n 1MS1(F1), MS7(F2)30*n 2MS3(F3)- 3MS5(F3)- [Traffic pattern & pre-defined frame index of sleep mode MS] [Possible Grouping 1] [Possible Grouping 2]

10. Example of Bitmap of Group sleeping mode Group ID := 1 Predefined Listening Frame := F2

11. Summary Group sleep mode instead of individual sleep mode –Same/similar traffic pattern –Bitmap in the super-frame control signal instead of TRF_IND –Group ID & pre-defined frame in the super-frame

12. Proposed Text X.x Sleep mode operation X.x.x Group Sleep mode BS manages MS in sleep mode with grouping according to the same/similar traffic pattern. BS transmits sleep information such as Group ID, frame number in the super-frame, and listening interval. BS indicates MS to wake up or sleep contiguously with bitmap which corresponds with sleep group ID.