Upload
premgprakash
View
17
Download
0
Embed Size (px)
Citation preview
INTRODUCTIONMobile devices are getting smaller and smarterMobile devices are equipped with a limited amount of
battery powerNext-generation wireless standards should provide very
efficient power conservation mechanismsTwo advanced power conservation mechanisms, sleep and
idle modes were proposed and adopted in IEEE 802.16m3GPP LTE adopts a discontinuous reception mechanism for
power conservation in RRC_CONNECTED and RRC_IDLE states
WiMAXWorldwide Interoperability of Microwave Access
WiMAXWiMAX, also known as IEEE 802.16Uses 10-66 GHz frequency bands and provides data rates up
to 70 Mbps & above over distance of 50 kmUses a base station to establish the wireless connection to the
subscriber Communication between two or more WiMAX base stations
could be Point to Point/ Line of Sight & between the base station and the subscriber can be Point to Multi Point/ Non Line of Sight
3GPP LTE Third Generation Partnership Program (3GPP) Long Term
Evolution (LTE)developed to provide higher data rates, lower latencies,
wider spectrumLike other cellular technologies LTE uses OFDM as
multiplexing techniqueLTE uses wider spectrum, up to 20 MHz, to provide
compatibility with existing cellular technologies
POSSIBILITIES FOR POWER SAVING In mobile networks an MS can be in one of the following
states:
State I: Receive or send trafficState II: Do not receive or send traffic while in active
session(s)State III: Not in an active session
POWER MANAGEMENT IN STATE IISleep mode operation of IEEE 802.16m can be divided
into the following stages
Sleep mode initiation
Sleep mode operation
Sleep mode exit
ADVANCED FEATURES TO ACHIEVE HIGHER POWER SAVING
Traffic exchange during sleep operation without sleep mode termination
Predefined sleep cycle settings adaptive to application characteristics
Dynamic adjustment of sleep cycle during sleep operation
LW early terminationVoIP-specific sleep operationMulticarrier sleep operation
SW AND LW OPERATION
Adaptive SW and LW operation makes IEEE 802.16m sleep mode simple and efficient
MSs save power during SWMonitor traffic indication broadcast by BS during LW
VoIP SUPPORT IN SLEEP MODEMS exchanges one set of packets every 20 msDuring its silent periods the MS exchanges a silence
insertion descriptor (SID) every 160 ms
3GPP LTE DRX IN RRC_CONNECTED STATE
Discontinuous reception in RRC_CONNECTED state is used for power saving while user equipment (UE) is in RRC_CONNECTED state
DRX mode can be enabled if there is no traffic longer than DRX inactivity timer or if the UE receives a control signal to enter DRX mode
POWER MANAGEMENT IN STATE IIIIdle mode operation of IEEE 802.16m can be divided into
the following stages
Idle mode initiation
Idle mode operation
Idle mode location update
Idle mode exit
ADVANCED FEATURES TO ACHIEVE HIGHER POWER SAVING
Multiple PGs’ assignment and managementUser mobility considerationElimination of paging and location updateTransfer of short message service without idle mode
terminationPaging overhead reductionMulti-carrier paging
NETWORK MODEL AND MULTIPLE PG OPERATION
MOBILITY-BASED PAGING AREA DESIGN
Determination of paging area size based on speedDetermination of paging area shape based on mobility
trajectory
DCR mode enhancements of idle mode
Multicarrier paging
3GPP LTE DRX IN RRC_IDLE STATEADVANCED FEATURES TO ACHIEVE HIGHER POWER
SAVING
Cell selection optimization during RRC_IDLE State
Mobility-based RRC_IDLE optimization
CONCLUSIONSPower saving is becoming critical in next-generation
wireless systemsNext-generation wireless networks provide advanced
power saving mechanismsEfficient and simple power conservation methodOptimized operation for various applications, traffic
patterns while providing extended battery life