Transcript 21-07-0258-00-0000-Multi-Radio-Power-Management.ppt

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
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IEEE 802.21 presentation release statements
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802.21 Multi-Radio Power Management
Study Group Proposal
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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
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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
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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
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Problem 1:
Power Management for Paging and Wake
on Wireless in Multi-Radio environment
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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
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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
•MS receiving Paging Announcement
Primitives: IEEE 802.21
1a
Is your radio in connected
mode in MS_a?
Yes! r_k is in connected
mode in MS_a
3
4
5
Is your radio in connected
mode in MS_a?
1b
2
Inter PC co-ordination
Paging announce on r_k
to turn on r_i
Paging announce on r_k
to turn on r_i
MS_a
BS/AP
of radio r_k
PC
of radio r_k
PC
of radio r_i
PC of r_j
•BS/AP Paging Announcement
Primitives: IEEE 802.21
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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
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Problem 2:
Power Management for Location Update
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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
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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
•MS Location Update Request/Response
Primitives: IEEE 802.21
LU for r_k
•BS/AP Location Update Request/Response
Primitives: IEEE 802.21
(sent on radio
r_i)
LU for r_k
(sent on radio
r_i)
LU for r_k
(sent on radio r_i)
LU_RSP for MS
LU_RSP for MS
LU_RSP for MS (sent on
r_i)
BS/AP
of radio r_i
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PC
of radio r_i
PC
of radio r_k
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Problem 3:
Power Management for Idle Mode Protocol
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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
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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
1
IM_entry for r_i, r_j, r_k
(sent on radio r_i)
2
IM_entry for MS on r_i, r_j,
r_k (sent on radio r_i)
3
IM_entry for MS
IM_entry for MS
4
5
IM_entry_RSP for MS
(paging parameters for r_j)
6
IM_entry_RSP for MS (contains paging params for r_k)
7
8
IM_entry_RSP for MS
(paging params for r_i,j,k)
IM_entry_RSP for
MS(paging params for
r_i,j,k)
MS
BS/AP
of radio r_i
•MS Enter/Exit Idle Mode
Request/Response Primitives:
IEEE 802.21
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PC
of radio r_i
PC
of radio r_j
PC
of radio r_k
•BS/AP Enter/Exit Idle Mode
Request/Response Primitives:
IEEE 802.21
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Problem 4:
Extensible Power Saving Operations
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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
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Savings on Battery Consumption
• On 802.11 interfacesA,
• 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 usedB,
• 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
Ahttp://www.wi-fiplanet.com/tutorials/article.php/1015781
B11-07-0058-01-000v-paging-power-saving-analysis-update
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Potential Solution Approach
• Extend 802.21 with new primitives and information
elements
• ES extensions
•
•
•
CS extensions
•
•
Power related link state change notification
Power schedule events
Configuration of power related behavior of clients
IS extensions
•
Declaration of power management feature capability
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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
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Q & A?
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802.21 Multi-Radio Power Management
SG Motion
• Motion to get 802.21 WG approval to form an 802.21 Study Group on MultiRadio 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:
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