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

This document discusses the design principles and operation of sleep mode in a multi-carrier system, focusing on power saving and efficient resource allocation.

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

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  1. Sleep Mode Operations with Multi-carrier Support for IEEE 802.16m IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16m-08/1033r2 Date Submitted: 2008-09-16 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. Design Principles (1/2) • 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 • Summary from the multi-carrier operation principles • Traffic indication can be implemented on different RF carriers • Traffic exchange can be implemented on different RF carriers • Traffic indication and exchange can be implemented on different RF carriers

  3. Design Principles(2/2) • 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 • 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 • Basic sleep mode operation for an MS with multi-carrier • All the RFs are turned off or connected with other BSs in the sleep intervals • One or more RFs can be awaked to exchange traffic in the extended listening windows • Only one of the RFs is awaked to detect/receive traffic indication in the listening window per sleep cycle • Option #1: Traffic indication is always executed on MS’s primary carrier • Option #2: Traffic indication is executed on one of the MS’s carriers

  4. 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

  5. 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

  6. 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 -------------------------------------------------------------------------------

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