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

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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

Individual Power Management Individual radios define their own power saving mechanisms WiFi PSM Extended PSM WiMAX SLEEP IDLE Cellular DORMANT IDLE

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.

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.

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

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 states Single radio view NRNR Reachable directly RIRI NRNR NRNR RIRI NRNR

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 view viewCentralized view Reachable Not reachable

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

Thank you

Redirect Example Addr2 IF1 Addr1 IF2 Network 1WiMAX SleepOff Network 1WiMAX SleepIdle Addr2 IF1 Addr1 IF2 CN