Document Number: Date Submitted: Source: Venue: Base Contribution: Purpose: Notice: This document does not represent the agreed views of the IEEE 802.16.

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Document Number: Date Submitted: Source: Venue: Base Contribution: Purpose: Notice: This document does not represent the agreed views of the IEEE

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Document Number: Date Submitted: Source: Venue: Base Contribution: Purpose: 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. Power Saving Management for IEEE m IEEE C802.16m-08/567r Chung-Hsien Yih-Shen I-Kang Paul MediaTek Inc. No.1, Dusing Rd. 1, Hsinchu Science-Based Industrial Park, Hsinchu, Taiwan 300, R.O.C. Denver, U.S.A. N/A To be discussed and adopted by TGm for the m SDD

2 Introduction The TGm SRD (IEEE m-07/002r4) specifies –Section 6.11 Enhanced Power Saving IEEE m shall provide support for enhanced power saving functionality to help reduce power consumption in devices for all services and applications Sleep mode in IEEE system –To minimize MS power usage and decrease usage of serving BS air interface resources –Base on power saving class (PSC) rather than individual connection or MS This contribution discusses and proposes different types of the power saving class for different service types for 16m system, including –PSC of type I for BE and NRT-VR service –PSC of type II for RT-CBR and RT-VR service –PSC of type III for multicast as well as for management operations –PSC of type IV for ERT-VR service

3 Service Type Comparison All the traffic can be generally classified into five service types –Real-time constant bit-rate (RT-CBR) T1/E1 and VoIP without silence suppression –Extended real-time variable bit-rate (ERT-VR) VoIP with silence suppression –Real-time variable bit-rate (RT-VR) MPEG video –Non-real time variable bit-rate (NRT-VR) FTP, HTTP –Best effort (BE) RT-CBRERT-VRRT-VRNRT-VRBE Data generation interval Periodic Variable Packet size Fixed Fixed/ Variable Variable Delay sensitivity High MiddleLow

4 Power Saving Class Consideration Power saving class (PSC) –A group of connections that have common demand properties –PSC shall be designed to enhance the power saving –PSC shall be designed to mimic the characteristics of the service type (e.g., data generation interval, packet size, and delay sensitivity) Four types of PSC are proposed and summarized as follows Sleep cycle = listening interval + sleep interval

5 PSC of Type I for 16m System Recommend for connections of BE, NRT-VR type –HTTP, FTP, Design concepts –Limited listening interval for receiving the indication message and traffic Negative indication: –The MS can start sleep interval after receiving the indication message Positive indication: –The traffic can be exchanged between the MS and BS during listening interval –The MS shall transit to Active mode for exchanging more traffic –Binary exponential increase sleep cycle length –Insert sleep offset in the head of the sleep mode Consider the behavior of traffic pattern and user interaction while reactive the PSC –PSC reactivation mechanism Conventional negotiation messages: sleep request/response Fast indication message –A bit for indicating the end of the burst packets may be designed in the MAC header –An end message may be sent in the end of the burst packets Idle time indication

6 PSC of Type I for 16m System (cont.) Basic structure Example:

7 PSC of Type II for 16m System Recommend for connections of RT-CBR, RT-VR type –T1/E1, VoIP without silence suppression, and MPEG video Design concepts –Fixed sleep cycle length for periodic data generation –Fixed/variable listening interval for fixed/variable-size packets Fixed interval for fixed-size packets (RT-CBR) Variable interval for variable-size packets (RT-VR) –Listening interval may be reduced or extended –Insert sleep offset in the head of the sleep mode Consider the waiting time for entering the sleep mode after the negotiation Basic structure

8 PSC of Type II for 16m System (cont.) Example: RT-CBR –Real-time data streams consisting of fixed-size data packets issued at periodic intervals Sleep negotiation follows the packet transmission immediately Example: RT-VR –Real-time data streams consisting of variable-size data packets issued at periodic intervals Packet transmission follows the sleep negotiation immediately

9 PSC of Type III for 16m System Recommend for multicast connections as well as for management operations –Periodic ranging, DSx operations, MOB_NBR-ADV etc. –Actually, it is the PSC of type III in 16e system Basic structure

10 PSC of Type IV for 16m System Recommend for connections of ERT-VR type –VoIP with silence suppression Design concepts –Two types of sleep cycle, the length of each type is fixed –Insert sleep offset in the head of the sleep mode Consider the waiting time for entering the sleep mode after the negotiation Example: VoIP with silence suppression traffic model

11 Proposed Text for SDD Add the following text into Session 10 of the SDD (IEEE m-08/003) text begin x Sleep Mode Management 10.x.y Power Saving Class Power saving class (PCS) is a group of connections that common demand properties. The enhanced PSC shall be considered in IEEE m. Therefore, the PSC shall be designed to mimic the characteristics of the service type, e.g., data generated interval, packet size, and delay sensitivity. 10.x.y.1 Power Saving Class of Type I.PSC of type I is recommended for connections of NRT-VR and BE type. Variable listening interval and variable sleep cycle length shall be considered in type I. Furthermore, the behavior of traffic pattern and user interaction while reactive the PSC shall also be considered. 10.x.y.2 Power Saving Class of Type II PSC of type II is recommended for connections of RT-CBR and RT-VR type. Fixed sleep cycle length and fixed/variable listening interval shall be considered in type II. Furthermore, an interval between the data transmission/reception and sleep negotiation shall be considered for enhancing the power saving.

12 Proposed Text for SDD (cont.) 10.x.y.3 Power Saving Class of Type III PSC of type III is recommended for multicast connections as well as for management operations. Actually, it is the PSC of type III in 16e system. 10.x.y.3 Power Saving Class of Type IV PSC of type IV is recommended for connections of ERT-VR type, i.e., VoIP with silence suppression. The length of sleep cycle shall be considered for active talking and silence periods individually. Furthermore, an interval between the data transmission/reception and sleep negotiation shall be considered for enhancing the power saving text end