Download - Vzw Dual Band Mobility Settings v2
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October 23rd 2013
Dual Band Mobility settings
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Vzw Initial AWS deployment in NY
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• Following launch on multiple sites in NYC, ALU has been monitoring traffic on AWS band
• Very few devices currently support AWS – PCMD analysis shows that 5 device models were seen on AWS up to now • Around 1-2% 3-8% of total device population on AWS – expected to go up
• AWS-capable devices are on AWS in average 40-50% of the time (some variations between sites)
• Idle mode setting already biased towards AWS through higher cell reselection priority
• Proposal is to consider more aggressive settings to retain devices on AWS as much as possible
Summary
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AWS Overlay Coverage
700
AWS
AWS Coverage will not match 700 MHz Coverage
Sector misalignment
Reduced AWS cell radius vs 700 in all but densest environments
Propagation anomalies due to large frequency difference between bands
Extended AWS propagation at AWS coverage edge (lower noise than continuing 700)
700 MHz In-building coverage better than AWS
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Idle mode Inter-frequency cell reselection
B4 B13
5
RSRPServing cell B4
Neighbor
Serving
Time
RSRP Target cell B13(lower prio)
tReselectionEUTRAN (2 s)
qRxLevMin + threshXLow
Lower priority cell is
reselected
qRxLevMin + sNonIntraSearch
UE starts measuring B13
qRxLevMin + threshServingLow
5
• qRxLevMin = -120dBm• sNonIntraSearch = 14 -> UE starts measuring B13 at -106dBm• threshServingLow = 4 -> UE reselects B13 at -116dBm, HO is at -111dBm
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ALCATEL-LUCENT — INTERNAL PROPRIETARY — USE PURSUANT TO COMPANY INSTRUCTION
Idle mode Inter-frequency cell reselection
B13 B4
6
RSRPServing cell B13
NeighborServing
Time
RSRP Target cell B4(higher prio)
tReselectionEUTRAN (2 s)
qRxLevMin + threshXHigh
Higher priority cell is
reselected
• qRxlevMin = -120 dBm• threshXHigh = 20 UE will reselect the higher priority cell when B4 is better than -120 + 20 = -100 dBm
6
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Dual band idle mode parameters
Object ParameterAWS settings (current and
proposed)B13 settings (current and
proposed)
Enb - ActivationServiceisInterFreqEutraSameFrameStructureMobilityAllowed
true true
Enb - LteCell - CellSelectionReselectionConf
pMax 23 23
qHyst 2dB 2dB
qRxLevMin -120 -114
qRxLevMinOffset 8 8
sIntraSearch 62 62
sNonIntraSearch 14 14
threshServingLow 5 4
CellReselectionConfLte id="0" (B13)
offsetFreq 0 0
cellReselectionPriority 3 3
qRxLevMin -120 -120
tReselectionEUTRAN 2 2
threshXHigh 20 20
threshXLow 0 0
CellReselectionConfLte id="0" (B4/AWS)
offsetFreq 0 0
cellReselectionPriority 5 5
qRxLevMin -120 -120
tReselectionEUTRAN 2 2
threshXHigh 20 10
threshXLow 0 0
1) AWS to B13 reselection at -115dBm (instead of -116dBm)2) B13 to AWS reselection at -110dBm (instead of -100dBm)
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ALCATEL-LUCENT — INTERNAL PROPRIETARY — USE PURSUANT TO COMPANY INSTRUCTION
Dual band connected mode parameters
1) When on B4, UE starts measuring B13 at -109 - 1 = -110 dBm 2) When on B4, UE sends A5 report to trigger IFHO when 1) B4 cell is lower than -113 - 2 = -115dBm3) When on B4, blind redirection is triggered at -117 - 3 = -120 dBm
Object Parameter Value in DB for AWS Value for B13 700MHz
Enb - ActivationServiceisInterFreqEutraSameFrameStructureMobilityAllowed
true true
A2 Coverage alarmthresholdEutraRsrp -109
Hysteris 1
A1 Leaving alarmthresholdEutraRsrp -108
Hysteris 1
A5 inter-frequency
thresholdEutraRsrp (serving) -113
threshold2EutraRsrp -113
Hysteris 2
A2 Below Serving FloorthresholdEutraRsrp -117
Hysteris 3
10