1. Presented at IEEE 802.21 session #26, in Jacksonville, FL
IEEE MEDIA INDEPENDENT HANDOVER
DCN: mrpm
Title: MRPM Based on Existing Power Management of WiFi, WiMAX, 3GPP, and 3GPP2
Date Submitted: May 2008
Presented at IEEE session #26, in Jacksonville, FL
Authors or Source(s): James Han (Motorola), Farrokh Khatibi (Qualcomm), Scott Henderson (RIM), Bryan Lyles (Telcordia), and George Babut (Rogers)
Abstract: MRPM approaches have to be based on existing power management methods in various wireless technologies.
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2. IEEE 802.21 presentation release statements
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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
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3. Introduction
MRPM is to manage multi-radios of a mobile device to reduce battery power drains in various use cases such that the multi-radio mobile devices can achieve longer usage times, such as talk/data time and standby time.
MRPM assumes that each wireless technology has its own power management approaches. MRPM’s goal is to efficiently apply these approaches to achieve lower battery drains of the multi-radio devices.
Here our main focuses are:
power management approaches in each technology,
their status (registered or deregistered),
paging, and
control signaling capability
Their applications in MRPM use cases
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4. WiFi Power Management Enablers (I)
IEEE802.11_WLAN_2003_Edition:
STA Power Management modes
A STA may be in one of two different power states:
Awake: STA is fully powered
Doze: STA is not able to transmit or receive and consumes very low power.
STAs operating in PS modes shall periodically listen for beacons, as determined by the STA’s ListenInterval and ReceiveDTIMs parameters of the MLME-POWERMGT.request primitive.
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5. WiFi Power Management Enablers (II)
In v (draft):
Sleep mode: An extended power save mode for non-AP STAs whereby a non-AP STA need not listen for every DTIM (Delivery Traffic Indication Message) Beacon frame, and can negotiate to not perform GTK/IGTK updates while in this mode.
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6. WiFi Power Management Enablers (III)
Summary:
Off mode: not registered
Sleep mode: registered, extended PS mode, listen some of the DTIMs; but cannot transmit/receive control messaging beyond the DTIM.
PS mode: also registered, and listen all DTIMs; but cannot transmit/receive control messaging beyond DTIM.
Active mode: registered and fully data and control signaling available.
There is no paging method for
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7. WiMAX Power management Enablers (I)
Idle mode: Idle Mode is intended as a mechanism to allow the MS to become periodically available for DL broadcast traffic messaging without registration at a specific BS as the MS traverses an air link environment populated by multiple BSs, typically over a large geographic area (for wake up).
Sleep mode: Sleep mode is a state in which an MS conducts pre-negotiated periods of absence from the Serving BS air interface.
Power Saving Classes of type I: Power Saving Class of this type is recommended for connections of BE, NRT-VR type.
Power Saving Classes of type II: Power Saving Class of this type is recommended for connections of UGS, RT-VR type.
Power Saving Classes of type III: Power Saving Class of this type is recommended for multicast connections as well as for management operations,
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8. WiMAX Power management Enablers (II)
BS Broadcast Paging (MOB_PAG-ADV) message
The MOB_PAG-ADV message shall be sent on the Broadcast CID or
Idle mode multicast CID during the BS Paging Interval.
Summary
Off mode: not registered
Idle mode: not registered, can receive paging, but cannot receive any control signaling beyond paging
Sleep mode: registered, can receive paging, and also can receive control signaling (in Power Saving Class III) in pre-negotiated time periods.
Active mode: registered, fully paging, control signaling, and data service available.
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9. 3GPP2 Power Management Enablers (I)
State diagrams of IS-95 and 3GPP2
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10. 3GPP2 Power Management Enablers (II)
3GPP2 MAC Layer services:
Signaling control
DCR PLICF (Dedicated/Common Router Physical Layer Independent Control Function)
Null state, dormant state, connected state (active, control hold, suspended state)
Dormant sate: idle or burst
Voice PLICF
Voice active state and null state
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11. 3GPP2 Power Management Enablers (III)
3GPP2 MAC Layer services
Data service PLICF
Null state, active state, control hold state, suspend state
Resource control
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12. 3GPP2 Power Management Enablers (IV)
Definitions of the states
Active state: State of the data service PLICF entity in which the dedicated traffic channel (dtch) and the dedicated MAC control channel (dmch) are maintained.
Dormant state: State of the data service DCR entity in which no dedicated logical channels are maintained, the service option is disconnected, but the Link Layer connection for the data service instance between the IWF and the mobile station is maintained and the base station maintains the IMSI to IWF mapping.
Dormant Burst Substate: A substate of the Dormant State. In addition to having the common properties of the Dormant state, users in this substate may receive short data bursts and request short data burst transmissions.
Dormant Idle Substate: A substate of the Dormant State. In addition to having the common properties of the Dormant state, users in this substate may receive short data bursts associated with a data service.
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13. 3GPP2 Power Management Enablers (V)
Definitions of the states
Control hold state: State of the data service PLICF entity in which the dedicated MAC control channel (dmch) is maintained, but dtch is not maintained.
Suspended state: State of the data service PLICF entity in which no dedicated logical channels are maintained, but in which the service option remains connected. RLP variables are saved in this state.
Null state: A state of the Data PLICF in which no data service has been activated, no service option has been connected, and no forward or reverse dedicated channels are allocated.
Service Connected State: State of the DCR PLICF. The user is in this state when the service option for the data service is connected. Simultaneously, the Data Service PLICF is in a connected state (Active, Control Hold, or Suspended State).
Voice Active State: State of the Voice PLICF entity in which the traffic channel (dtch) is maintained and the voice service option is connected.
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14. 3GPP2 Power Management Enablers (VI)
Summary:
Active state’s power consumption may vary depending on services and traffic loads
Dormant state’s power consumption varies due to idle (receiving) or burst (receiving and transmissing) substates
Control hold state and suspend state may help the service recovery. Their power consumptions may not vary too much.
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15. 3GPP Power Management Enablers (I)
State diagram
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16. 3GPP Power Management Enablers (II)
Definitions of the states
Idle mode
No camping
Camp on GSM/GPRS cell:Camped on any cell: UE is in idle mode and has completed the cell selection/reselection process and has chosen a cell irrespective of PLMN identity.
GPRS packet idle mode
Camp on UTRAN cell: the same as above for UTRAN
Connected mode
GSM connected mode
GPRS packet transfer mode
UTRA RRC connected mode
URA_PCH or CELL_PCH state (Paging Channel, neither DCCH nor DTCH available, monitor paging and PICH)
CELL_FACH state (Forward Access Channel, DCCH and DTCH (if configured) are available)
CELL_DCH state (Dedicated Channel, DCCH and DTCH (if configured) are available)
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17. Use Case I: Paging On Active Interface (I)
“Paging” of a mobile terminated call is a control signaling paging. That is, the control signaling channel has to be open at the time of paging. Otherwise an alternative approach has to be performed.
For WiMAX, active and sleep mode can be considered to have control signaling channels open. The paging can be conducted as normally.
Off and idle states: not registered. In order to page the mobile device, one has to use the following two ways
Through MIH server:
determine whether it is in the coverage area of WiMAX through MIH server
MIH server has to determine whether any other service is available and whether the service’s control signaling channel is available for “paging”
Paging signaling is sent through MIH server through WiFi (assume that it is in active state) to the device to wake up the WiMAX.
Through WiMAX paging:
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18. Use Case II: Location Update on Active Interface
In order to update the “location” from WiFi, then we have to change the design in infrastructure and in mobile device because the WiMAX mobile device is not registered in the network when the WiMAX modem is in idle or off state.
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19. Thank You!
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20. Appendix
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21. Power Save Mode
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