1. Sleep Mode Operations with Multi-carrier Support for IEEE 802.16m
IEEE Presentation Submission Template (Rev. 9)
Document Number: IEEE C802.16m-08/1033r1
Date Submitted:
Source: Chung-Hsien Hsu
Yih-Shen Chen
I-Kang Fu
Paul Cheng
MediaTek Inc. No.1, Dusing Rd. 1, Hsinchu Science-Based Industrial Park,
Hsinchu, Taiwan 300, R.O.C.
Venue: MAC: Multi-Carrier Operation; in response to the TGm Call for Contributions and Comments m-08/033 for Session 57
Base Contribution: This is the base contribution
Purpose: To be discussed and adopted by TGm for the m SDD

2. Different Power-saving Level in Sleep mode (1/2)
Connection level power saving
A state for a connection to discontinuously receive/transmit traffic
Consist of a series of alternate awake and sleep intervals
Awake interval for detecting and/or receiving traffic
Sleep interval for saving power
RF level power saving
A state for a RF to discontinuously receive/transmit traffic
A common set of all the connections which are operated in the sleep mode on a RF carrier
Sleep interval for saving power or operating with other BSs (e.g., scanning, pre-association, and network re-entry)
MS level power saving
A state for an MS to discontinuously receive/transmit traffic
A common set of all the RF carriers in an MS, which are all in the sleep mode
Consist of series of alternate listening and sleep windows
Listening window for detecting and/or receiving the traffic
Sleep window for saving power or operating with other BSs (e.g., scanning, per-association, and network re-entry)

3. Different Power-saving Level in Sleep mode (2/2)
Illustration of the different power-saving level for an MS in the Sleep mode with multi-carrier support

4. Design Principles
Multi-carrier operation principles (specified in SDD)
Each MS shall consider only one RF carrier to be its primary carrier in a cell
A primary carrier shall be fully configured for an MS
A secondary carrier shall be partially configured for an MS
The resource allocation can span across multiple RF carriers
A multi-carrier system may assign secondary carriers to an MS in the downlink and/or uplink asymmetrically based on system load, peak data rate, or QoS demand
Design principles of Sleep mode in multi-carrier system
Reuse the fundamental design concept of sleep mode in single-carrier system
Enhance the power saving in RF level and MS level
Reduce the total times of the RFs sleep/awake switch in an MS
Reduce the number of MS’s active RFs as many as possible

5. Basic Sleep Mode Operation for an MS with Multi-carrier (1/2)
Option #1: Traffic indication is always executed on MS’s primary carrier
BS transmits traffic indication message on MS’s primary carrier
BS indicates MS to receive traffic on which carrier according to some purposes (e.g., enhanced power saving, bandwidth constraint, and QoS consideration)
MS receives traffic indication message on its primary carrier and awakes the corresponding RF to receive traffic
Disadvantages:
Performance is constrained by the schedule of MS’s primary carrier
Ex: MS’s primary carrier is scheduled for scanning, pre-association, and network re-entry
Power consumption is increased due to traffic indication and traffic exchange is executed on different RF carriers
Ex: BS doesn’t have any bandwidth to transmit traffic to an MS on its primary carrier

6. Basic Sleep Mode Operation for an MS with Multi-carrier (2/2)
Option #2: Traffic indication is executed on MS’s primary or secondary carriers
BS transmits traffic indication message on MS’s primary or secondary carriers
BS indicates MS to receive traffic on which carrier according to some purposes (e.g., enhanced power saving, bandwidth constraint, and QoS consideration)
MS receives traffic indication message on a pre-designed carrier and awakes the corresponding RF to receive traffic
Advantage: Reduce the unnecessary RF sleep/awake switch for an MS
Traffic indication and traffic exchange is executed on the same RF carrier for an MS
Disadvantage: Some power consumption is caused while executing traffic indication and traffic exchange on different RF carriers
Ex: BS doesn’t have enough bandwidth to transmit all the traffic to an MS on a carrier

7. Proposed Text for SDD
Add the following text into SDD (IEEE m-08/003r4)
text begin
10.x.y Sleep Mode Operation with Multi-carrier Support
BS transmits traffic indication message to an MS on one of MS’s RF carriers. MS receives traffic
indication message on a pre-designed carrier. MS awakes the corresponding RF to receive traffic
in accordance with BS’s resource allocation.
text end