Sleep Mode Considerations for a Device-Based Power Saving Document Number: S80216m-08_580 Date Submitted: 2008-07-07 Source: Mamadou Kone

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Sleep Mode Considerations for a Device-Based Power Saving Document Number: S80216m-08_580 Date Submitted: Source: Mamadou Kone Ming-Hung Tao Ying-Chuan Hsiao Richard Li ITRI. Venue: Session #56 Denver, USA Base Contribution: IEEE C80216m-08_580r1 Purpose: For discussion and adoption by IEEE m group Notice: This document does not represent the agreed views of the IEEE 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 Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and.

Approach Actual design of power saving mode has lots of complexities and signaling overheads making inefficient the power saving for a device. Two important performance factors have to be considered for MS operating in sleep mode: 1. MS power consumption  Depend on the number of Power Saving Class (PSC) and their design 2. Signaling load generated by MS in sleep mode  Traffic indications, deactivation and handoffs signals from the network Unavailability interval Availability interval Positive Traffic indication The PSC type 2 could be still running, but the device power saving is interrupted. DL/ UL data burst Receive signal from BS to reactivate PSC1 PSC type 1 – listening window of constant size and doubling sleep window PSC type 2 – listening window of constant size and sleep window of constant size Traffic indication Type 1 connections : BE, NRT-VR; Type 2 connections : RTVR, UGS, ERTVR Type 3 connections : Multicast, Periodic ranging, Management messages Deactivation of PSC type 3 Device mode – Unavailability interval - period of inactivity of the device

Sleep mode issues Common issues from e:  Three kinds of PSC: Overlapping of listening and sleep windows may extend power consumption.  Possibly several PSCs within same type of connection: Overlapping issue to get the device sleep interval. PSC type 2 issues  Fix listening window : May be too long or too short to cover different cases of traffic behaviors (HARQ operations, etc). PSC type 1 issues:  Signaling load: MOB_TRF_IND (traffic indication) at every listen window and signals for deactivation / reactivation of the power saving.  Reactivation of the power saving with Initial sleep window no matter the length of the sleep window before deactivation.  No influence of the doubling sleep window on device sleep interval when coupled with PSC type 2. PSC type 3 issues  Lack of listen window: signaling for reactivation of the power saving  No influence of long sleep window on device sleep interval when coupled with PSC type 2 or type 1.

Enhancement within same type of connections Use of traffic timer to monitor data burst or positive traffic indication Use of data burst timer to monitor data burst ending Match the start of every listening window with a super frame header Use a HARQ timer for data recovery After incoming data, new Initsleep= multiple of Initial sleep < last sleep. Data burst timer reached, MS sleeps Data/positive traffic indication received before timer ends Type 3 operations Signal to sleep and/or for next wakeup time The listening window is extended to recover the data HARQ traffic timer expires for each reception HARQ traffic timer stopped because of erroneous data Default listen window Sleep window HARQ traffic timer expires for each reception Traffic timer ends, no data burst received Only type 2 connections Only type 3 connections Only type 1 connections Super frame header For same type of connections: Integrate all the connections into a unique power saving class to represent their traffics pattern. Timer not expired, incoming data Timers not expired still data Initial sleep longer Default listen window to carry out normal operations of DL and UL based on no error of transmission Use HARQ traffic timer or data recovery and listening window may cover the next sleep length Define default listen and timers(multicast, periodic ranging) are used to increase its length when needed. The default listen window size could be a multiple of the longest timer used. Signaling to trigger MS sleep and/or decide for the next data time otherwise default length of inactivity used after timers expire.

Merging connections into a unique PSC Combine in each case two different types of connection in a unique Power saving class predicted type 3 inactive time matches with listen Listen matches with type 3 connections data reception timers expire or signal for next wakeup time Data burst timer expires Data burst / positive traffic indication for type 1 traffics Work as PSC type 2 connections only, because no data burst Traffic timer starts and ends no data burst received Receiving type 3 data Positive traffic indication for type 1 traffics Data burst timer expires Predicted type 3 inactive time is ok for type 1 traffics buffering Use type 2 connections to design the unique PSC With type 1 connection use: all timers from different types as previously defined. With type 3 connections use the predictive sleep period to define the scenarios of listen and sleep Listen window extensible with timers to support operations Signal for next wake up time Remaining Sleep window Type 2 and type 3 connections Type 2 and type 1 connections Type 1 and type 3 connections Traffic timer didnt expire Use the length of the type 3 connection inactive time as the default sleep window (matching with BS buffer for type 1 data) Integrate the timers/signals from type 1 and type 3 connections during listening window to either continue to receive data or sleep

Toward the design of a unique PSC Integrate type 1 connection to the merging of type 2 and type 3 to define only a unique Power Saving Class Type 1 connections data burst opportunity can be offered during every n default listening period. Apply all the timers and signals already define from all types of connections and also the possible listening window flexibility. Predicted type 3 inactive time matches with default listen sleep window reduced by listening extension length Listening matches with type 3 connections data reception Signal to stop data sending for type 3 and define next wake up time 2nd opportunity: traffic indication positive for type 1 traffics 1st opportunity for type 1 traffic, but no burst, so works as PSC 2 Listening extended Data burst timer ends Inactive Active Illustration of the device power saving from the unique PSC A unique power saving class representing all traffic patterns Power saving periods Here n= every 2 listening window

Dynamic Update of the unique PSC In case of update within the same type of connection, apply the update to listening and sleep windows definition.  Applied the change to the next sleep when decreasing the sleep length  Can apply the change to a later sleep period when increasing the sleep length In case of update or complete deletion of one type of connection included in the unique PSC design.  Update the unique Power saving class based on the remaining types of connection.  Signaling to decide for the effective start of the new definition if needed. predicted type 3 inactive time type 3 connections data reception traffic indication for type 1 traffics 1st opportunity for data burst, but traffic timer expires, works as PSC 2 type 3 connections data reception Signal for next wakeup type 3 connections data reception No traffic indication/data burst 1st new opportunity: traffic indication positive type 3 connections data reception Signal for next wakeup time …… Type 2 connection deletion indication Exchange new windows definition for 2nd sleep … Next predicted inactive time New parameters applied Type 1 connection deletion indication … type 3 connections data reception Signal for next wakeup time No more traffic timer, works with type 3 connections only Define or not new windows size for next sleep New parameters are applied No traffic indication/ data burst Signal for next wakeup time

3. Proposed text for SDD [Insert the following into sleep section of [2]] Text start X.x.x Sleep mode Sleep mode operation uses connection behaviors to design a unique device-based power saving framework. A mechanism for adaptively adjusting sleep patterns (i.e. duration of sleep and listening windows) based on traffic pattern without deactivating the sleep mode should be provided. This unique power saving framework uses efficient timers with less signaling that enables maximum MS power saving and reduces the air-link resource usage associated with sleep mode signaling Text end References [1] IEEE Std e-2005, IEEE Standard for Local and metropolitan area networks, Part 16: Air Interface for Fixed and Mobile Broadband Wireless Access Systems, Amendment 2: Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands, and P802.16Rev2/D3 (February 2008). [2] IEEE m-08/003r1, “The Draft IEEE m System Description Document”