IEEE MEDIA INDEPENDENT HANDOVER Title: Multi-Radio Power Management Date Submitted: July, 2007 Presented at IEEE 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: Multi-Radio Power Management SG proposal

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Multi-Radio Power Management Study Group Proposal

Current 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 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

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: Media independent idle mode and paging.ppt Idle Mode and paging.ppt Media Independent Paging.ppt Multi-Radio Paging.ppt

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

Problem 1: Power Management for Paging and Wake on Wireless in Multi-Radio environment

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

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 MS receiving Paging Announcement Primitives: IEEE

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

Problem 2: Power Management for Location Update

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

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 MS Location Update Request/Response Primitives: IEEE

Problem 3: Power Management for Idle Mode Protocol

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

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 BS/AP Enter/Exit Idle Mode Request/Response Primitives: IEEE

Problem 4: Extensible Power Saving Operations

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 to be extensible for application to new/future power saving schemes or technologies

Savings on Battery Consumption On 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 interfaces, if paging (proposed in v in 2006) can be used B, For a “less-mobile” user (10 roams per hour): 2.73% % For a “more-mobile” user (45 roams per hour): 12% % If paging on connected interface then 3 to 27 % power savings A B v-paging-power-saving-analysis-update

Potential Solution Approach Extend 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

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

Q & A?

Multi-Radio Power Management SG Motion Motion to get WG approval to form an 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: