Broadcast Indicator Broadcast Indicator & &

MS Power ConsumptionMS Power Consumption

Manuary 11 2003Stash Czaja, Feng Qian sczaja@via-telecom.com

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OutlineOutline

• BCMCS RequirementsBCMCS Requirements• BCMCS Transmission AnalysisBCMCS Transmission Analysis• BCMCS IndicatorsBCMCS Indicators• BCMC and MS Power Consumption BCMC and MS Power Consumption • SummarySummary

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BCMCS RequirementsBCMCS Requirements

• Radio channel requirements for BCMCS were defined in document P-0019 as follows: Optimal use of radio resources, including the use of

shared channels Minimization of the use of reverse link capacity Preservation of battery life flexibility - relationship between network and content

provider are based on static provisioning or via protocol exchanges (dynamic) and are still under development or study

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BSPM Transmission MethodsBSPM Transmission Methods

• Were analyzed in C23-BCMCAHG-20030904-002r1 (Lucent) • System info such as: flow ID, RC config, logical to physical channel

mappings, neighbor list info, etc. must carried on an overhead channel• BSPM which can carry several hundreds of bytes has been proposed• Method for notification of availability of BCMCS content with low latency,

low impact on MS battery and low impact on battery life of legacy MS Conclusions:

• BSPM information changes very frequent (min broadcast cycle = 5.12 sec)• Global broadcast of BSPM requires legacy MS “wake up” to decode BSPM• Use of QPCH broadcast indicator (BI) for signaling BSPM changes will:

– Effects battery life of MS supporting QPCH– Does not effect battery life of MS operating in non-slotted mode– Does not effect battery life of MS not supporting QPCH – Use multiple BI indicators to reduce impact on the battery life of MS

not supporting BCMCS

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BCMCS IndicatorsBCMCS Indicators

• Regardless of findings in Lucent contribution a single BCMC indicator was included into Rel-D

• Characteristics of single (global) BCMC indicator Significant impact on MS battery life (C30-20030930-004 )

• Differential BSPM contains parameters associated with all flows and is directed to all MS in the cell

• Legacy MS (not supporting BCMCS) must decode BSPM as well

• lack of flexibility - inability to address individual MS

+1

QPCH Slot

188 or 376 PI IndicatorsB

CM

CS

Global BCMC Indicator

0

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3-state BCMCS Indicator3-state BCMCS Indicator

• In C30-20030930-004 VIA proposed to use 3-state signaling on QPCH to allow individual :

+1 PI_ON 0 OFF 1 BCMC_ON

• Characteristics: Compatible with legacy mobiles Does not impact battery life of legacy MS Individual indication of BCMCS parameters

change Flexibility

+1

188 or 376 PI Indicators0

188 or 376 BCMC Indicators-1

+1

0

-1User 1 - OFF

User 2 - BCMC = ON

User 3 - PI = ON

QPCH Slot

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BCMCS and MS Battery LifeBCMCS and MS Battery Life

• It was agreed that BSPM message must be sent every 5 – 25 sec.

• Consequence of a single BCMC indicator Assumptions:

• 2.56 sec. PI slot cycle • 25 sec. BCMC slot cycle• 20 BCMCS flows, Walsh resources assigned dynamically

In 1 hr. BCMC capable MS: • wakes-up for ~5 ms every 2.5 sec to decode QPCH PI bit for a

total “on-air” time: 3600 2.56 1400 * 5ms = 7 sec• wakes-up every 25 sec to decode BSPM message (min 80 ms)

for a total “on-air” time: 3600 2.56 1400 * 5ms + 144 * 80ms 18.5 sec

62% reduction in MS battery life! Most important – legacy MS battery life is

also reduced even it doesn’t support Rel D BCMCS!

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SummarySummary

• Single BCMC indicator may have catastrophic impact on battery life of all (including legacy) MSs assigned to QPCH slot Users may refuse to use the BCMCS service if the his terminal

operational functionality is compromised

• Single BCMC indicator does not allow indicate changes associated with particular subscription (specific FLOW_ID individual MS)

• Solution: 3-state BCMC indicator on QPCH No negative impact on MS battery life No impact (compatible) on legacy MSs Flexibility in addressing individual MS to support future

services