Group Sleep Mode in IEEE 802.16m

IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number:

IEEE C802.16m-08/591r1Date Submitted:

2008-07-07Source:

Eunkyung Kim, Namsuk Lee, Kyung Soo Kim Voice: +82-42-860-5415ETRI E-mail: {ekkim, namsuk, kksu}@etri.re.kr138 Gajeongno, Yuseong-gu, Daejeon, 305-700, KOREA

*<http://standards.ieee.org/faqs/affiliationFAQ.html>Venue:

IEEE 802.16 Session #56, Denver, CO, USABase Contribution:

NonePurpose:

To discuss and adopt the proposed text in the next revision of the 802.16m SDDNotice:

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.

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Contents

• Grouping the Sleep Mode MSs• Sleep Mode Operation• Example of

– Grouping of Sleep Mode MSs– Bitmap of Group Sleeping Mode

• Summary• Proposed Text

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

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

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]

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]

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]

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

Example of Grouping the sleep mode MSs

Traffic tx/rx Interval Pre-defined frame index in super-frame

MS1 30 F1

MS2 40 F2

MS3 70 F3

MS4 60 F0

MS5 50 F3

MS6 80 F1

MS7 90 F2

Group MS(s) Pattern

0 MS1(F1),MS4(F4),MS7(F2) 30*n

1 MS2(F2), MS6(F0) 40*n

2 MS3(F3), MS5(F3) -

3 - -

Group MS(s) Pattern

0 MS2(F2),MS4(F0),MS6(F4) 20*n

1 MS1(F1), MS7(F2) 30*n

2 MS3(F3) -

3 MS5(F3) -

[Traffic pattern & pre-defined frame index of sleep mode MS]

[Possible Grouping 1]

[Possible Grouping 2]

Example of Bitmap of Group sleeping mode

• Group ID := 1• Predefined Listening Frame := F2

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

Proposed Text

• X.x Sleep mode operationX.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.