Sleep Mode Operations with Multi-carrier Support for IEEE 802.16m

1. Sleep Mode Operations with Multi-carrier Support for IEEE 802.16m IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: C802.16m-08/1033 Date Submitted: 2008-09-05 Source: Chung-Hsien Hsu stanley.hsu@mediatek.com Yih-Shen Chen yihshen.chen@mediatek.com I-Kang Fu IK.Fu@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. Venue: MAC: Multi-Carrier Operation; in response to the TGm Call for Contributions and Comments 802.16m-08/033 for Session 57 Base Contribution: This is the base contribution Purpose: To be discussed and adopted by TGm for the 802.16m 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 • Consist of a series of alternate awake and sleep intervals • Awake interval for detecting and/or receiving traffic • 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 802.16m-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 -------------------------------------------------------------------------------