1. 21-09-0069-03-00001 IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-09-0069-03-0000 Title: MRPM Principle Date Submitted: May 11, 2009 Presented at IEEE 802.21 session #32 in Montreal Authors or Source(s): Junghoon Jee, Hongseok Jeon, Changmin Park (ETRI); Anthony Chan (Huawei) Abstract: Multi-Radio Power Management Principle.

2. 21-09-0069-03-00002 IEEE 802.21 presentation release statements This document has been prepared to assist the IEEE 802.21 Working Group. 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. 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 802.21. The contributor is familiar with IEEE patent policy, as outlined in Section 6.3 of the IEEE-SA Standards Board Operations Manual and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/guide.html> Section 6.3 of the IEEE-SA Standards Board Operations Manualhttp://standards.ieee.org/guides/opman/sect6.html#6.3 http://standards.ieee.org/board/pat/guide.html

3. 21-09-0069-03-00003 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

4. 21-09-0069-03-00004 Individual Power Management Individual radios define their own power saving mechanisms WiFi PSM Extended PSM WiMAX SLEEP IDLE Cellular DORMANT IDLE

5. 21-09-0069-03-00005 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.

6. 21-09-0069-03-00006 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.

7. 21-09-0069-03-00007 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

8. 21-09-0069-03-00008 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 802.11 states Single radio view NRNR Reachable directly RIRI NRNR NRNR RIRI NRNR

9. 21-09-0069-03-00009 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 Combined view of 2 interfaces 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 view802.16 viewCentralized view Reachable Not reachable

10. 21-09-0069-03-000010 MRPM (MN) MRPM Example 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

11. 21-09-0069-03-000011 Thank you

12. 21-09-0069-03-000012 Redirect Example Addr2 IF1 Addr1 IF2 Network 1WiMAX SleepOff Network 1WiMAX SleepIdle Addr2 IF1 Addr1 IF2 CN