1. 1 IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-08-0072-00-MRPM Title: Media Independent Power Management Tutorial Date Submitted: March, 2008 Presented at IEEE 802.21 March 17-20 at Orlando Authors or Source(s): H Anthony Chan (Huawei) Abstract: This tutorial explains 802.21 media independent power management and includes a generalized treatment of power saving modes of operation.

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3. 3 802.21 MRPM Tutorial Multi-Radio Power Conservation Management (MRPM)

4. 4 Terminology On/Active: actively running a network application such as transmitting data to or receiving data from the network. Standby: ready to transmit and to receive data at any time. Sleep mode: basically off but wakes up at regular intervals in synchrony with network to transmit and to receive data when needed. Deep sleep mode: intervals between successive wakeups can be much longer. Off: completely off

5. 5 Battery life While engineers may work on power conservation, customers perceive primarily the battery life (between recharges), which depends on how the MN is being used For example, a mobile device may have: Battery life in ON mode: ~ 2 hours Battery life in STANDBY mode: ~ 1 days Battery life in SLEEP mode: ~ 6-7 days Battery life in DEEP SLEEP mode: >> 6-7 days

6. 6 Why MRPM? Each network has own power management for paging and wake, location update, sleep mode protocol, and power saving operations. Each one is performing tasks that consume energy.

7. 7 Battery life With multiple interfaces, customers perceive primarily the life (between recharges) of the shared battery, which depends on how each interface is being used

8. 8 Battery life with 2 interfaces On/ActiveStandbyNormalsleepDeepsleepOff Battery life (approximate only) Remarks 1 interfaceA2 hrReference A24 hr A 6  24 hours A >> 6  24 hours DualAB2 hr minus 9 minLose 9 min of ON life interfacesAB2 hr minus 1 minLose 1 min of ON life standbyA,B12 hrLose 12 hrs of standby mode battery life sleepA,B 3  24 hours Lose 3 days of sleep mode battery life

9. 9 Tasks consuming energy (irrespective of whether mobile or not)

10. 10 Sleep interval

11. 11 Additional Tasks when moving

12. 12 Update serving AP/BS via another network when many network 1 cells are inside each of network 2 cell may update network 2 from network 1 but the converse is non-trivial

13. 13 Update initiated from MN

14. 14 Update initiated from MN How often? Sleep interval < time to move to outside of cell Sleep interval >> time to move to outside of cell Or completely off

15. 15 How often? MN associated with an AP may remain there for hours. Even a 100 km/hr vehicle carrying an MN takes several minutes to traverse a 10 km radius cell.

16. 16 MRPM Multiple radio power conservation management: collaborative efforts from the different networks and the multiple radio interfaces to optimize power conservation in the operations of paging, sleep, wake, and serving BS/AP update. Analogy: car-pool / public transportation. Media independent power conservation management

17. 17 MIH

18. 18 MRPM

19. 19 Scenario One radio (A) to handle paging Other radios (B,C, … ) only need serving BS/AP update, which may be through network or be initiated by MN

20. 20 Battery life with 2 interfaces On/ActiveStandbyNormalsleepDeepsleepOff Battery life (approximate only) Remarks Active/OnAB2 hr minus 9 minLose 9 min of ON life AB2 hr minus 1 minLose 1 min of ON life AB B standbyA,B12 hrLose 12 hrs of standby life AB24hr minus 3hr 26 min AB AB sleepA,B 3  24 hours Lose 3 days of sleep life AB 6  24 minus 2.4 hours Lose 2.4 hrs of sleep life AB