Fasltink IRAQ Second Carrier Introduction Ed02

COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED.

ALU RF Team16th Dec 2013

FASTLINK-IRAQSECOND CARRIER FEATURE INTRODUCTION

3


AGENDA

Introduction

LTE Inter-frequencyuency Cell Reselection

LTE Inter-frequencyuency Handover

LTE Inter frequencyuency Load balancing

Load Based Idle Mode Mobility

Conclusion

4


AGENDA

Introduction

LTE Inter-frequency Cell Reselection

LTE Inter-frequency Handover

LTE Inter frequency Load balancing


Conclusion

5


• As a result of traffic growth in Fastlink network, increased capacity and

offloading is considered through the 2nd carrier approach

• the second carrier is proposed with:

- 10 MHz carrier bandwidth adjacent to the original 20MHz.

- No Guard band required.

• Alcatel-Lucent’s Dual carrier feature is implemented using:

- 1 extra bCEM to handle the second carrier 3 cells in the same BBU (alongside the

original 20MHz Carrier bCEM)

- 3 RRHs

- 3 Antennas

• The presentation purpose is to showcase the functionality and features

associated with the Dual carrier such as Selection, Reselection , Mobility and

Load Balancing between carriers.

• Inter freq load balance feature no L115223

• Load Based Idle Mode Mobility feature no L115203

INTRODUCTIONDUAL CARRIER

6


Dual

Carrier

KEY BENEFITS

• Dual Carrier

feature is

proposed to

allow 2 bCEM to

populate 1 BBU

Reselection

KEY BENEFITS

• Idle mode

connectivity

allows the user

continuous

service

availability

Handover

KEY BENEFITS

• Connected

mode

connectivity

allows service

retainability

and minimizes

data

interruption

Load

Balancing

KEY BENEFITS

• Load Balancing

between

carriers to

minimize CAC

blocking

INTRODUCTIONFEATURE SUMMARY

7


Test cases Field Results

1 Reselection

Reselection Low to High Priority Pass

Reselection High to Low Priority Pass

Reselection Equal Priority Pass

2 Inter-frequency HO

Inter-frequencyuency HO based on Event A3 Pass

Inter-frequencyuency HO based on Event A5 Pass

Inter-frequencyuency Redirection based on Event A2 Floor Pass

3 Preventive Offloading

Preventive Offloading Load Balancing based on Event A4 Pass

X2 RESOURCE STATUS REPORTING Pass

Preventive Offloading Load balancing with eMCTA filtering Pass

4 reactive offloadingReactive Offloading through Outgoing Mobility Not tested

Reactive Offloading through Release Not tested

5Load Based Idle Mode

MobilityIdle Mode Load Balancing Pass

INTRODUCTIONTEST CASES

8


AGENDA

Introduction





Conclusion

9


THEORYRESELECTION SUMMARY

10



11


FIELD RESULTSRESELECTION - PARAMETER SETTINGS

Parameter Value

1 isInterfrequencyEutraSameFrameStructureMobilityAllowed TRUE

2 cellReselectionPriority (High) 5

3 cellReselectionPriority (Low) 4

4 threshServingLow (dB) 10

5 threshXhigh (dB) 20

6 threshXLow (dB) 0

7 qRxLevMin (dBm) -126

8 tReselectionEUTRAN (S) 2

9 sIntraSearch (dB) 62

10 sNonIntraSearch (dB) 16

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FIELD RESULTSRESELECTION LOW TO HIGH PRIORITY

CRP-Serving

1.SIB3 message

13



CRP-Target

2.SIB5 message

14



3.Reselection to higher priority cell

15


FIELD RESULTSRESELECTION HIGH TO LOW PRIORITY

1.SIB3 message

16



2.SIB5 message

17



3.Reselection to lower priority cell

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FIELD RESULTSRESELECTION EQUAL PRIORITY

1.SIB3 message

19



1.SIB5 message

20



3.Reselection to lower priority cell

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AGENDA

Introduction





Conclusion

22


THEORYHANDOVER EVENTS SUMMARY

UE measurement report trigger types supported in eNB:

• Event A1 – UE sends measurement reports when serving is better than a threshold value.

• Event A2 – UE sends measurement reports when serving is worse than a threshold value.

• Event A3 – UE sends measurement reports when neighbor becomes offset better than serving.it is used to trigger intra-frequencyuency HO and inter-frequencyuency redirection/HO if UE does not support event A5 configuration.

• Event A4 – UE sends measurement reports when neighbor becomes better than a threshold.

• Event A5 – UE sends measurement reports when serving becomes worse than threshold1

and neighbor becomes better than threshold2.It is used to trigger inter-frequencyuency redirection/HO and intra-frequencyuency with ANR.

• Event B1 – UE sends measurement report when Inter-RAT neighbor becomes better than

Threshold.

• Event B2 – UE sends measurement report when serving becomes worse than threshold1

and inter-RAT neighbor becomes better than threshold2.

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THEORYHANDOVER EVENTS SUMMARY

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FIELD RESULTSHANDOVER - PARAMETER SETTINGS

# Parameter Value

1 isInterfrequencyEutraSameFrameStructureMobilityAllowed TRUE

2 isMeasurementGapsAllowed TRUE

3 ReportConfigEUTRA::thresholdEutraRsrp (Event A2 Coverage Alarm) -100

4 ReportConfigEUTRA::thresholdEutraRsrp (Event A2 Below Serving Floor) -119

5 ReportConfigEUTRA::thresholdEutraRsrp (Event A1 Coverage Alarm) -90

6 ReportConfigEUTRA::thresholdEutraRsrp (Event A5) -100

7 ReportConfigEUTRA::threshold2EutraRsrp (Event A5) -100

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FIELD RESULTSINTER-FREQUENCYUENCY HO BASED ON EVENT A3

Add A2 EVENT COVERAGE ALARM EARFCN 3050 @CALL SETUP

, A2_BELOW SERVING FLOOR 3050 @ CALL SETUP

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Measurement Report

A2_ COVERAGE ALARM 3050

27



RemoveA2_COVERAGE ALARM

Add A1 EVENT 3050

A3 EVENT 2900

28



Measurement report A3 EVENT 2900

29



HO CMD30502900

30



HO CompleteIFHO SUCCESSFUL

31



RemoveA1_CA

AddA2_COVERAGE ALARM

2900

32



Remove

A2_CA

AddA1_CA 3050

A3 2900

A5 2900

33



MR A5 2900

34



RemoveA1_CA

A5

Add A2_CA 2900

35


FIELD RESULTSINTER-FREQUENCYUENCY REDIRECTION BASED ON A2 FLOOR

MR A2_FLOOR 3050

36


FIELD RESULTS

INTER-FREQUENCYUENCY REDIRECTION BASED ON A2 FLOOR

ReleaseREDIRECT 2900

37


FIELD RESULTS

INTER-FREQUENCYUENCY REDIRECTION BASED ON A2 FLOOR

RRC Setup REDIRECT

SUCCESSFUL

38


AGENDA

Introduction





Conclusion

39


THEORYLOAD BALANCING STEPS

Step 1: TRIGGERING

• Estimated DL/UL PRB usage per cell is updated by new admitted requests and periodic modem PRB usage reporting.• Load balancing is triggered when current PRB usage exceeds a configurable % of total PRBs available in the cell.

Step 2: UE SELECTION FOR

OFFLOADING

• UE candidates for offloading must support inter-frequencyuency HO• UE candidates must have ARP priority level above a configurable threshold (i.e.lowest priority UEs are selected for offloading).

Step 3: EXECUTION OF OFFLOADING

• eMCTA algorithm selects unloaded target carrier(s) for UE Measurements, based on X2 Resource Status Reporting information.• Best cell in RRC Measurement Report is filtered on load status.• Inter-frequencyuencyHO only to unloaded cell.

40


THEORYLOAD CONTROL

There are two types of congestion control supported:

1. Reactive Load Control: initiated when congestion is detected during radio

admission control of a new request. This procedure attempts to offload UEs or

release radio bearers in order to free enough resources to admit a higher priority

request.

2. Preventive Load Control : initiated before congestion is reached during radio

admission control of a new request or upon reception of a modem report. This

procedure attempts to offload lower priority UEs to avoid reaching congestion and to

achieve load balancing of calls between eNBs by offloading selected UEs to neighboring

inter-frequencyuency cells which have spare load capacity..

• Compared with reactive offloading, preventive offloading will use a more

rigorous UE selection scheme in order to have as small an impact on user

experience as possible.

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THEORYPREVENTIVE LOAD CONTROL

42


FIELD RESULTSLOAD BALANCING- PARAMETER SETTINGS

PARAMETER VALUE

1 isInterfrequencyEutraSameFrameStructureMobilityAllowed True

2 isInterfrequencyLoadBalancingFeatureEnabled True

3 isPreventiveLoadControlAllowed True

4 isReactiveLoadControlAllowed True

5 ReportConfigEUTRA::thresholdEutraRsrp (Event A4) -100

6 dlPreventiveLoadControlThresholdOnPrb 10

7 ulPreventiveLoadControlThresholdOnPrb 80

8 dlCellLoadedThreshold 80

9 ulCellLoadedThreshold 80

10 cellCapacityClass <unset>

11 dlMinBitRateForBE 2048

12 ulMinBitRateForBE 1

43


FIELD RESULTSPREVENTIVE OFFLOADING LOAD BALANCING BASED ON EVENT A4

Add A4 2900

44



MR A4 2900

45



HO CMD30502900

46



HO CompleteIFHO SUCCESSFUL

47



Remove

A2_CA

A4

Add

A2_CA 2900

48


FIELD RESULTSX2 RESOURCE STATUS REPORTING

49


FIELD RESULTSPREVENTIVE OFFLOADING LOAD BALANCING WITH EMCTA FILTERING

NoNo HO CMD NBR CELL LOADED

MR A4 2900

50


AGENDA

Introduction





Conclusion

51



52


THEORYLOAD BASED IDLE MODE MOBILITY

53


THEORYLOAD BASED IDLE MODE MOBILITY

54


FIELD RESULTSIDLE MODE LOAD BALANCING- PARAMETER SETTINGS

PARAMETER VALUE

1 isSIB3ReselectionAutomationEnabled True

2 isInterfrequencyEutraSameFrameStructureMobilityAllowed True

3 autoReselectValueTagChange True

4 autoReselectMinInterval (sec) 60

5 dlMinBitRateForBE 2048

6 weightDlPrbCell/weightDlPrbEnb 1

7 ulMinBitRateForBE 1

8 weightUlPrbCell/weightUlPrbEnb 1

9 qHyst dB6

10 sNonIntraSearch 20

11 threshServingLowDelta (All Objects) 0

13 threshXLowDelta (All Objects) 0

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FIELD RESULTSIDLE MODE LOAD BALANCING- PARAMETER SETTINGS

PARAMETER VALUE

1

Object1

LowerBound 5

2 UpperBound 6

3 qHystDelta -2

4 sNonIntraSearchDelta 14

5

Object2

LowerBound 7

6 UpperBound 8

7 qHystDelta -4


9

Object3

LowerBound 9

10 UpperBound 100

11 qHystDelta -6


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FIELD RESULTSIDLE MODE LOAD BALANCING

PagingSystemInfoModification is True

57



SIB1SystemInfoValueTag has increased by 1

58



SIB3NO LOAD

59



SIB3LOAD WITHIN OBJECT 1

60




61




62


AGENDA

Introduction





Conclusion

63


• Alcatel-Lucent’s Dual Carrier Solution is capable of operating six cells of two carriers

• Mobility functions of Reselection and Handover is ensuring coverage continuity between the two carriers/layers

• Load Balancing through Preventive Offloading is capable of shifting and balancing traffic between the two carriers/layers

• Idle Mode Load Balancing has the capability to adjust cell selection settings according to cell load, thus helping to balance traffic and load among cells, it impacts intra-frequency, inter-frequency reselection

• Reactive Offloading was not tested

CONCLUSIONRESULTS

Documents

Fasltink IRAQ Second Carrier Introduction Ed02