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Power Saving Management for IEEE 802.16m

C802.16m-08/567

2008-07-07

Chung-Hsien Hsu stanley.hsu@mediatek.com

Yih-Shen Chen yihshen.chen@mediatek.com

Paul Cheng paul.cheng@mediatek.com

MediaTek Inc.No.1, Dusing Rd. 1, Hsinchu Science-Based Industrial Park,

Hsinchu, Taiwan 300, R.O.C.

IEEE 802.16m-08/024 “Call for Comments and Contributions on Project 802.16m System Description Document (SDD)”

In response to the topic: Upper MAC concepts and methods (power management)

N/ATo be discussed and adopted by TGm for the 802.16m SDD

Introduction

• The TGm SRD (IEEE 802.16m-07/002r4) specifies– Section 6.11 Enhanced Power Saving

• IEEE 802.16m shall provide support for enhanced power saving functionality to help reduce power consumption in devices for all services and applications.”

• The TGm SDD (IEEE 802.16m-08/003r3) specifies– Section 6.3.2 Sleep

• During sleep mode, MS can do power saving during traffic interval

• This contribution discusses and proposes different types of the power saving class for different service types, including

– PSC of type II for UGS and RT-VR service– PSC of type IV for ERT-VR service– PSC of type I for BE and NRT-VR service– PSC of type III for multicast as well as for management operations

Service Type Comparison

• All the traffic can be generally classified into five service types– Real-time constant bit-rate (e.g., T1/E1 and VoIP without silence suppression)– Extended real-time variable bit-rate (e.g., VoIP with silence suppression)– Real-time variable bit-rate (e.g., MPEG video)– Non-real time variable bit-rate (e.g., FTP, HTTP)– Best effort (e.g., E-mail)

RT-CBR ERT-VR RT-VR NRT-VR BE

Data generated interval

Periodic Periodic Periodic Dynamic Dynamic

Packet size FixedFixed/

dynamicDynamic Dynamic Dynamic

Delay sensitivity High High High Middle Low

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

generated interval, packet size, and delay sensitivity)

• Four types of PSC are proposed and summarized as follows

Sleep cycle = listening interval + sleep interval

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/dynamic listening interval for fixed/variable-size packets– Insert sleep offset in the head of the sleep mode

• Consider the waiting time for entering the sleep mode after the negotiation

PSC of Type II for 16m System (cont.)

• Example 1:– Real-time data streams consisting of fixed-size data packets issued at periodic i

ntervals (e.g., T1/E1 and VoIP without silence suppression)– Sleep negotiation follows the packet transmission immediately

• Example 2: – Real-time data streams consisting of variable-size data packets issued at periodi

c intervals (e.g., MPEG video)– Packet transmission follows the sleep negotiation immediately

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

PSC of Type I for 16m System

• Recommend for connections of BE, NRT-VR type– HTTP, FTP, E-mail

• Design concepts– Fixed listening interval for receiving the indication message– Binary exponential increase sleep cycle length– Insert sleep offset in the head of the sleep mode

• Considering the behavior of traffic pattern and user interaction while re-enter the sleep mode

PSC of Type I for 16m System (cont.)

• Example 1:– Web browsing (HTTP) traffic model– Mean = 30 sec for reading time from the TGm EMD (IEEE 802.16m-07/004r1)

• Example 2:– File transfer protocol (FTP) model– Mean = 180 sec for reading time from the TGm EMD (IEEE 802.16m-07/004r1)

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

Proposed Text for SDD

Add the following text into Session 10 of the SDD (IEEE 802.16m-08/003)

-------------------------- text begin -----------------------------------------------------------------------------

10.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 802.16m. 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. Fixed listening interval and dynamic sleep cycle length shall be considered in type I. Moreover, the behavior of traffic pattern and user interaction while re-entry the sleep mode 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/dynamic listening interval shall be considered in type II. Moreover, an interval between the data transmission/reception and sleep negotiation shall be considered for enhancing the power saving.

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. Moreover, an interval between the data transmission/reception and sleep negotiation shall be considered for enhancing the power saving.

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