maxCacThreshold
•邻区的可用容量>=AMLEPR:
cacHeadroom
•UE检测到的目标邻区的下行rsrp大于设定的LNHOIF:
thresholdRsrpIFLBFilter参数门限
iFLB与AMLE的区别:
iFLB
AMLE
当小区达到高负载门限时,iFLB提供负载均衡
AMLE将小区与配对邻区的负载差异控制在所设的负载差值以内
iFLB的目的是把小区的负载控制在所设的负载门限下,而不是平衡小区间的负载
候选邻区的筛选过程类似iFLB
负载的信息只在同个eNB的小区间分享;对于不同eNB小区使用的是盲切换,不根据邻区的负载情况来判断
小区间使用资源状态报告(RSR)来分享负载情况,不使用盲切换,对于没有RSR的邻区将不会被切换
2.负载均衡功能测试
2.1异厂家负载均衡功能测试
为进行Nokia和HWLTE基站间负载均衡的实验,选定实验点为首都机场T1出发厅。
如下图所示,涉及到的Nokia小区为朝阳机场T1F2至F3层公共区NLM(ENBID:
76309),涉及到的HW基站为顺义首都机场T1航站楼F2F3东侧办公餐饮区及出港大厅HLM499769-132。
2.1.1参数设置
Ø开启featureLTE1531:
Inter-frequencyLoadBalancingExtension(开启iFLB)
ParameterName
ParameterFullName
MOC
默认值
修改值0301
9:
06~13:
00
修改值0226-2
10:
45~11:
30
修改值0226-1
10:
00~10:
30
actInterFreqLB
Activationofinterfrequencyloadbalancing(iFLB)
LNBTS
false
TRUE
TRUE
TRUE
thresholdRsrpIFLBFilter
Inter-Frequency LBThresholdforRSRPTargetFilter
LNHOIF
-98
-95
-95
-95
thresholdRsrqIFLBFilter
Inter-Frequency LBThresholdforRSRQTargetFilter
LNHOIF
-12
-12
-12
-12
targetLoadGbrDl
DLGBRresourcetargetload
LNCEL
50
50
50
50
targetLoadNonGbrDl
DLnon-GBRresourcetargetload
LNCEL
75
75
5%
8%
targetLoadPdcch
PDCCHtargetload
LNCEL
50
3%
50%
5%
iFLBHighLoadGBRDL
Inter-FrequencyLoadBalancingDLGBRHighLoad
LNCEL
60
60
60
60
iFLBHighLoadNonGBRDL
Inter-FrequencyLoadBalancingDLnon-GBRHighLoad
LNCEL
85
85
8%
10%
iFLBHighLoadPdcch
Inter-FreqLoadBalancingPDCCHHighLoad
LNCEL
80
5%
80%
7%
nomNumPrbNonGbr
NominalnumberofPRBsforloadbalancing
LNCEL
1
10
10
10
iFLBBearCheckTimer
Inter-FrequencyLoadBalancingQCI1BearerCheckTimer
LNCEL
12
12
12
12
prohibitLBHOTimer
ProhibitLoadBasedHandoverTimer
LNCEL
10
10
10
10
iFLBRetryTimer
InterFreqLoadBalRetryTimer
LNCEL
60
60
60
60
Ø开启featureLTE1841:
Inter-FrequencyLoadEqualization(开启AMLE)
MOClass
ParameterName
ParameterFullName
默认值
修改值3月1日
16:
39:
00
LNBTS
actIfHo
EnableinterFrequencyhandover
enabled
enabled
LNBTS
actAmle
Activateactivemodeloadequalization
false
TRUE
LNBTS
actInterFreqLB
Activationofinterfrequencyloadbalancing(iFLB)
false
TRUE
LNBTS
prohibitLBHOTimer
ProhibitLoadbasedhandovertimer
10
10
LNREL
amleAllowed
Activemodeloadequalizationallowed
false
TRUE
LNREL
removeAllowed
Removeallowed
true
FALSE
LNHOIF
thresholdRsrpIFLBFilter
Inter-freqloadbalthresholdforRSRPtargetfilter
-98
-95
LNHOIF
thresholdRsrqIFLBFilter
Inter-freqloadbalthresholdforRSRQtargetfilter
-12
不设置
LNCEL
cellResourceSharingMode
Cellresourcesharingmode
none
none
LNCEL
threshold2InterFreq
Thresholdth2interFreqforRSRP
-100
-90
LNCEL
threshold2a
Thresholdth2aforRSRP
-96
-87
LNCEL
iFLBRetryTimer
InterFreqLoadBalRetryTimer
60
60s
LNCEL
iFLBHighLoadGBRDL
Inter-frequencyloadbalancingGBRhighloadDL
60
60%
LNCEL
iFLBHighLoadNonGBRDL
Inter-frequencyloadbalancingnon-GBRhighloadDL
85
8%
LNCEL
iFLBHighLoadPdcch
Inter-frequencyloadbalancingPDCCHhighload
80
80%
LNCEL
iFLBBearCheckTimer
Inter-frequencyloadbalancingQCI1Bearerchecktimer
12
12s
LNCEL
cellCapClass
Cellcapacityclassvalue
100
100
LNCEL
targetLoadGbrDl
DLGBRresourcetargetload
50
50%
LNCEL
targetLoadNonGbrDl
DLnon-GBRresourcetargetload
75
5%
LNCEL
targetLoadPdcch
PDCCHtargetload
50
50%
LNCEL
mlbEicicOperMode
ModeforcalculatingtheCACinloadbal.andeICIC
allUes
allUes
LNCEL
nomNumPrbNonGbr
NominalnumberofPRBsforloadbalancing
1
10
LNCEL
ulStaticCac
StaticCACforuplink
100
100
LNCEL
ulCacSelection
UplinkCACsourceselection
ulReflectDlCac
ulReflectDlCac
LNCEL-AMLEPR
amlePrId
amlePrId
0/1
0
LNCEL-AMLEPR
deltaCac
DifferenceinCACofsourceandtargetcells
20
5%
LNCEL-AMLEPR
cacHeadroom
HeadroominCAC
0
0
LNCEL-AMLEPR
targetCarrierFreq
Targetcarrierfrequency
39148
LNCEL-AMLEPR
maxCacThreshold
ThresholdformaximumCAC
100
100
2.1.2实验效果
Ø开启featureLTE1531:
Inter-frequencyLoadBalancingExtension(开启iFLB)
开启featureLTE1531后,指标统计Nokia76309-1和HW499769-132基于iFLB的LBHO全部成功,信令显示触发原因为reduce-load-in-serving-cell,符合预期。
SDATETIME
ENB_CELL
HO_LB_ATT
HO_LB_SUCC
HIGH_CELL_LOAD_LB
201602261000
76309-1
1
1
18
201602261015
76309-1
4
4
25
201602261030
76309-1
7
7
32
201602261045
76309-1
28
28
91
201602261100
76309-1
3
3
16
201602261115
76309-1
1
1
11
201602261130
76309-1
3
3
25
201603010945
76309_1
3
3
28
201603011000
76309_1
43
43
215
201603011015
76309_1
8
8
62
201603011030
76309_1
0
0
4
201603011045
76309_1
1
1
14
201603011100
76309_1
8
7
22
201603011115
76309_1
51
44
146
201603011130
76309_1
20
16
80
201603011145
76309_1
16
15
71
201603011200
76309_1
2
1
10
201603011215
76309_1
52
40
170
201603011230
76309_1
7
7
33
201603011245
76309_1
20
17
62
201603011300
76309_1
2
1
13
Ø开启featureLTE1841:
Inter-FrequencyLoadEqualization(开启AMLE)
开启featureLTE1841后,指标统计LBHO有尝试计数,信令显示触发原因也为reduce-load-in-serving-cell,但同时也开启了iFLB,为了区分LB基于具体feature,抓取wireshark,Nokia小区有发起资源请求,但未出现厂家间资源信息交互。
SDATETIME
ENB_CELL
HO_LB_ATT
HO_LB_SUCC
HIGH_CELL_LOAD_LB
201603011600
76309_1
0
0
0
201603011615
76309_1
0
0
0
201603011630
76309_1
47
36
156
201603011645
76309_1
55
46
229
201603011700
76309_1
0
0
0
201603011715
76309_1
0
0
0
76309向HW小区发起的资源请求消息类型为CompositeAvailableCapacityPeriodic,周期性综合可用容量。
IE/GroupName
Presence
Range
IEtypeandreference
Semanticsdescription
Criticality
AssignedCriticality
ReportCharacteristics
O
BITSTRING
EachpositioninthebitmapindicatesmeasurementobjecttheeNB2 isrequestedtoreport.
YES
reject
(SIZE(32))
FirstBit=PRBPeriodic,
SecondBit= TNLloadIndPeriodic,
ThirdBit=HWLoadIndPeriodic,
FourthBit=CompositeAvailableCapacityPeriodic.
Bits5to32shallbeignoredbytheeNB2
2.2同厂家同站双载波负载均衡功能测试
为进行Nokia同站内各载波间负载均衡的实验,选定实验点为76413朝阳机场2号航站楼出发厅南侧NLM,该站点两个载波业务量和用户数分布不均。
2.1.3参数设置
开启featureLTE1841:
Inter-FrequencyLoadEqualization(开启AMLE)
MOClass
ParameterName
ParameterFullName
默认值
修改值
3.210:
00
LNBTS
actIfHo
EnableinterFrequencyhandover
enabled
enabled
LNBTS
actAmle
Activateactivemodeloadequalization
FALSE
TRUE
LNBTS
actInterFreqLB
Activationofinterfrequencyloadbalancing(iFLB)
FALSE
FALSE
LNBTS
prohibitLBHOTimer
ProhibitLoadbasedhandovertimer
10
10
LNREL
amleAllowed
Activemodeloadequalizationallowed
FALSE
TRUE
LNREL
removeAllowed
Removeallowed
TRUE
FALSE
LNHOIF
thresholdRsrpIFLBFilter
Inter-freqloadbalthresholdforRSRPtargetfilter
-98
-90
LNHOIF
thresholdRsrqIFLBFilter
Inter-freqloadbalthresholdforRSRQtargetfilter
-12
不设置
LNCEL
cellResourceSharingMode
Cellresourcesharingmode
none
none
LNCEL
threshold2InterFreq
Thresholdth2interFreqforRSRP
-100
-90
LNCEL
threshold2a
Thresholdth2aforRSRP
-96
-87
LNCEL
iFLBRetryTimer
InterFreqLoadBalRetryTimer
60
60s
LNCEL
iFLBHighLoadGBRDL
Inter-frequencyloadbalancingGBRhighloadDL
60
60%
LNCEL
iFLBHighLoadNonGBRDL
Inter-frequencyloadbalancingnon-GBRhighloadDL
85
8%
LNCEL
iFLBHighLoadPdcch
Inter-frequencyloadbalancingPDCCHhighload
80
80%
LNCEL
iFLBBearCheckTimer
Inter-frequencyloadbalancingQCI1Bearerchecktimer
12
12s
LNCEL
cellCapClass
Cellcapacityclassvalue
100
100
LNCEL
targetLoadGbrDl
DLGBRresourcetargetload
50
50%
LNCEL
targetLoadNonGbrDl
DLnon-GBRresourcetargetload
75
5%
LNCEL
targetLoadPdcch
PDCCHtargetload
50
50%
LNCEL
mlbEicicOperMode
ModeforcalculatingtheCACinloadbal.andeICIC
allUes
allUes
LNCEL
nomNumPrbNonGbr
NominalnumberofPRBsforloadbalancing
1
10
LNCEL
ulStaticCac
StaticCACforuplink
100
100
LNCEL
ulCacSelection
UplinkCACsourceselection
ulReflectDlCac
ulReflectDlCac
LNCEL-AMLEPR
amlePrId
amlePrId
0/1
0
LNCEL-AMLEPR
deltaCac
DifferenceinCACofsourceandtargetcells
20
5%
LNCEL-AMLEPR
cacHeadroom
HeadroominCAC
0
0
LNCEL-AMLEPR
targetCarrierFreq
Targetcarrierfrequency
39148
LNCEL-AMLEPR
maxCacThreshold
ThresholdformaximumCAC
100
100
2.1.4实验效果
修改后76413两载波用户数实现均衡,1小区用户数下降,PRB利用率下降,同时11小区用户数增加,PRB利用率有所上升。
由于是站内切换无明显log显示LBHO,但切换事件均为LB切换的所用事件A4,符合预期。
SDATETIME
ENB_CELL
HO_LB_ATT
HO_LB_SUCC
HIGH_CELL_LOAD_LB
201603020800
76413_1
0
0
0
201603020815
76413_1
0
0
0
201603020830
76413_1
0
0
0
201603020845
76413_1
0
0
0
201603020900
76413_1
0
0
0
201603020915
76413_1
0
0
0
201603020930
76413_1
0
0
0
201603020945
76413_1
0
0
0
201603021000
76413_1
138
137
0
201603021015
76413_1
120
118
0
201603021030
76413_1
172
169
0
201603021045
76413_1
237
237
0
201603021100
76413_1
243
240
0
201603021115
76413_1
264
262
0
201603021130
76413_1
210