1. 21-07-0258-00-00001 IEEE 802.21 MEDIA INDEPENDENT HANDOVER Title: Multi-Radio Power Management Date Submitted: July, 2007 Presented at IEEE 802.21 session #21, San Francisco Authors or Source(s): Behcet Sarikaya (Huawei), Muthu Venkatachalam, Emily Qi, DJ Johnston (Intel), Benjamin Koh (Panasonic) Phil Barber (Huawei) Abstract: 802.21 Multi-Radio Power Management SG proposal

2. 21-07-0258-00-00002 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. 21-07-0258-00-00003 802.21 Multi-Radio Power Management Study Group Proposal

4. 21-07-0258-00-00004 Current 802.21 WG PAR PAR says: “The purpose is to improve the user experience of mobile devices by facilitating handover between 802 networks whether or not they are of different media types, including both wired and wireless, where handover is not otherwise defined and to make it possible for mobile devices to perform seamless handover where the network environment supports it. These mechanisms may also be useable for handovers between 802 networks and non 802 networks.” IEEE 802.21 WG did not address power management aspect of handovers as part of the current project (see 5 Criteria document) Due to the desire to define MIHF protocol first

5. 21-07-0258-00-00005 Problem Scope Problem 1: Power Management for Paging and Wake on Wireless in Multi-Radio environment Problem 2: Power Management for Location Update Problem 3: Power Management for Idle Mode Protocol Problem 4: Extensible Power Saving Operations Related contributions: 21-06-0701-00-0000-Media independent idle mode and paging.ppt 21-06-747-00-0000-Idle Mode and paging.ppt 21-06-0806-01-0000 Media Independent Paging.ppt 21-07-0121-00-0000 Multi-Radio Paging.ppt

6. 21-07-0258-00-00006 Multi-Radio Power Management The goal is to develop interface primitives needed for power management by extending current 802.21 specification The goal is not to develop power optimization algorithms on the mobiles because they are implementation specific and interoperability can not be tested

7. 21-07-0258-00-00007 Problem 1: Power Management for Paging and Wake on Wireless in Multi-Radio environment

8. 21-07-0258-00-00008 What is the Problem? Current paging systems are designed to achieve power savings but the assumption is that there is only one interface Current paging systems require periodic wake-ups in idle mode which consumes battery Current paging systems signal to a large number of base stations in search of MN which leads to non-optimal usage of the mobile communications infrastructure Considerable power savings at the MN can be achieved using multi-radio power management and also radio/network/device resource optimization at the mobile communication infrastructure can be provided in paging and wake on LAN in multi-radio mobiles

9. 21-07-0258-00-00009 Usage Scenario 1 Example: User is browsing on the Wi-Fi interface, User gets a VoIP call on the WiMAX interface, WiMAX network needs to page the user Wake up WiMAX interface using Wi-Fi BS/AP Paging Announcement Primitives: IEEE 802.21 MS receiving Paging Announcement Primitives: IEEE 802.21

10. 21-07-0258-00-000010 What’s Available Today? Single-Radio Paging Paging is defined in 3GPP and WiMax No paging is defined in 802.11 at this point. Sleep Mode service (under development of 802.11v) can eventually accommodate this requirement (alerting MN) No standards group seems to be chartered to work on the multi-radio power management

11. 21-07-0258-00-000011 Problem 2: Power Management for Location Update

12. 21-07-0258-00-000012 What is the Problem? Location of the mobile in idle mode needs to be updated. Current systems are designed with a single interface in mind and therefore lead to high battery consumption because the interface has to stay active during location signaling Single-radio or vertical systems do not take into account the additional capabilities arising from having multiple radios In multi-radio mobiles, considerable power savings at the MN can be achieved by being able to use the active mode radio for location updates

13. 21-07-0258-00-000013 Usage Scenario 2 Example: User has WiFi connection that is currently active and WiMAX connection that is idle Instead of contending on the WiMAX airlink, MS uses the Wi-Fi radio to perform location update for its WiMAX radio BS/AP Location Update Request/Response Primitives: IEEE 802.21 MS Location Update Request/Response Primitives: IEEE 802.21

14. 21-07-0258-00-000014 Problem 3: Power Management for Idle Mode Protocol

15. 21-07-0258-00-000015 What is the Problem? Idle mode entry/exit needs to be signaled. Current systems are designed with a single interface in mind and therefore lead to high battery consumption because the interface has to stay active during idle mode signaling Single-radio or vertical systems do not take into account the additional capabilities arising from having multiple radios Considerable power savings at the MN can be achieved using multi-radio power management by simply considering the multi-radio capability and use the active mode radio for idle mode signaling

16. 21-07-0258-00-000016 Usage Scenario 3 Example: Multiple radios are being switched to idle mode For example: when the user takes a break, his WiMAX, WiFi and 3G connections may go into idle mode IM Entry/Exit for radios i, j, k happens on radio-i MS Enter/Exit Idle Mode Request/Response Primitives: IEEE 802.21 BS/AP Enter/Exit Idle Mode Request/Response Primitives: IEEE 802.21

17. 21-07-0258-00-000017 Problem 4: Extensible Power Saving Operations

18. 21-07-0258-00-000018 What is the Problem? Considerable power savings at the MN can be achieved using multi-radio power management by simply considering the multi-radio capability Single-radio or vertical systems do not take into account the additional capabilities arising from having multiple radios Objective is to allow 802.21 to be extensible for application to new/future power saving schemes or technologies

19. 21-07-0258-00-000019 Savings on Battery Consumption On 802.11 interfaces A, Active mode power consumption 250 mA Power save mode 30mA or 12% minimum but usually higher like 100 mA or 40% If interface can be turned off, 12 to 40% power savings On 802.11 interfaces, if paging (proposed in 802.11v in 2006) can be used B, For a “less-mobile” user (10 roams per hour): 2.73% - 6.12% For a “more-mobile” user (45 roams per hour): 12% - 27.08% If paging on connected interface then 3 to 27 % power savings A http://www.wi-fiplanet.com/tutorials/article.php/1015781 B 11-07-0058-01-000v-paging-power-saving-analysis-update

20. 21-07-0258-00-000020 Potential Solution Approach Extend 802.21 with new primitives and information elements ES extensions Power related link state change notification Power schedule events CS extensions Configuration of power related behavior of clients IS extensions Declaration of power management feature capability

21. 21-07-0258-00-000021 Proposed Direction for Problems Work on 802.21 Enhanced Functionalities From a wider perspective, single-radio power management systems adaptations for 802.21 enhancements No standards group is known to be working on the multi-radio power management  Leverage on the current 802.21 experience

22. 21-07-0258-00-000022 Q & A?

23. 21-07-0258-00-000023 802.21 Multi-Radio Power Management SG Motion Motion to get 802.21 WG approval to form an 802.21 Study Group on Multi- Radio Power Management in July 2007 to work on a PAR defining the scope and requirements of the identified areas Moved by: Seconded by: Yes: No: Abstain: Result: