1. doc.: IEEE 802.11-09/0586r0 Submission May 2009 Junghoon Jee, ETRISlide 1 MRPM Principle Notice: This document has been prepared to assist IEEE 802.11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) 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 802.11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at.http:// ieee802.org/guides/bylaws/sb-bylaws.pdfstuart.kerry@philips.compatcom@ieee.org Date: 2009-5-12 Authors:

2. doc.: IEEE 802.11-09/0586r0 Submission May 2009 Junghoon Jee, ETRISlide 2 Overview Motivation –Multi-Radio terminals are becoming popular –Multiple active radio interfaces drain battery power very rapidly Objective –Optimize multi-radio power consumption MRPM Principle –Optimized power management Deactivate unused radio interface Activate the deactivated radio interface when required –No modification of individual power states –Management of multi-radio power states

3. doc.: IEEE 802.11-09/0586r0 Submission May 2009 Junghoon Jee, ETRISlide 3 Individual Power Management Individual radios define their own power saving mechanisms WiFi –PSM –Extended PSM WiMAX –SLEEP –IDLE Cellular –DORMANT –IDLE

4. doc.: IEEE 802.11-09/0586r0 Submission May 2009 Junghoon Jee, ETRISlide 4 Power Saving vs. Reachability Deactivating unused radio interface is inevitable to reduce power consumption of multi-radio terminal. However, the deactivated radio interface looses network reachability thus impossible to serve incoming traffic. We need a way to keep network reachability even for the deactivated radio interface.

5. doc.: IEEE 802.11-09/0586r0 Submission May 2009 Junghoon Jee, ETRISlide 5 Multi-Radio Power Management MRPM defines multi-radio power states and manages them between MN and MIH PoS to provide network reachability for deactivated radio interface Network reachability of single radio terminal –If a radio interface is deactivated in single radio terminal, the terminal completely looses network reachability. –The traffic toward the terminal cannot be delivered. Network reachability of multi-radio terminal –Deactivated radio interface can be regarded as reachable by the help of another radio which can be utilized to locate the terminal for the incoming traffic.

6. doc.: IEEE 802.11-09/0586r0 Submission May 2009 Junghoon Jee, ETRISlide 6 Multi-Radio Power Management (2) Multi-radio power states are managed in MIHF level –REACHABLE-DIRECTLY Activated and reachable –REACHABLE-INDIRECTLY (RI) Deactivated but reachable via another radio interface –NOT REACHABLE (NR) Deactivated and non-reachable MRPM –Manages multi-radio power states –Tracks the MN ’ s currently accessible heterogeneous network coverage information –Activate/Deactivate MN ’ s radio interface MN –Updates MIH PoS on the changed multi-radio power states

7. doc.: IEEE 802.11-09/0586r0 Submission May 2009 Junghoon Jee, ETRISlide 7 Reachable directly MRPM view Radio view (states) Reachable Indirectly (RI) Reachable NRNR Not Reachable (NR) In service (active data traffic) PSM Extended PSMOff Power on (active) Power off Single radio view NRNR Reachable directly RIRI NRNR NRNR RIRI NRNR 802.11 States

8. doc.: IEEE 802.11-09/0586r0 Submission May 2009 Junghoon Jee, ETRISlide 8 Reachable directly MRPM view of each IF Single interface (IF) view Individual radio state Reachable via another IF Not Reachable Reachable NRNR NRNR NRNR In service (active data traffic) PSM Extended PSM Off Power on (active) Power off Reachable NRNR NRNR NRNR In service (active data traffic) Sleep classes 1, 2, 3 Idle Off Power on (active) Power off Reachable directly Reachable via another IF Not Reachable view from network 802.11 view 802.16 view Centralized view Reachable Not reachable

9. doc.: IEEE 802.11-09/0586r0 Submission May 2009 Junghoon Jee, ETRISlide 9 MRPM (MN) Multi-Radio States WiFiWiMAX REACHABLE_DIRECTLY Radios WiFi is turned off Individual Radio States WiFiWiMAX ActiveIDLE OFF ES: WiFi turned-off, REACHABLE via WiMAX REACHABLE_INDIRECTLY(WiMAX) WiFi is selected CS: command to wake up WiFi interface ON ES: WiFi turned-on, REACHABLE_DIRECTLY REACHABLE_DIRECTLY MRPM (Network) Incoming traffic to WiFi Redirect to WiMAX

10. doc.: IEEE 802.11-09/0586r0 Submission May 2009 Junghoon Jee, ETRISlide 10 Thank you

11. doc.: IEEE 802.11-09/0586r0 Submission May 2009 Junghoon Jee, ETRISlide 11 Addr2 IF1 Addr1 IF2 Network 1WiMAX SleepOff Network 1WiMAX SleepIdle Addr2 IF1 Addr1 IF2 CN