Omo131020 Bsc6900 Gsm v9r11r12r13 Handover Algorithm i Issue1.11
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Transcript of Omo131020 Bsc6900 Gsm v9r11r12r13 Handover Algorithm i Issue1.11
8/13/2019 Omo131020 Bsc6900 Gsm v9r11r12r13 Handover Algorithm i Issue1.11
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Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved. Page2
Foreword
Handover is a key technology of mobile communication system
and make continued conversation possible.
Handover algorithm in Huawei product is flexible and powerful.
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Objectives
Upon completion of this course, you will be able to:
Outline the types of handover
Master handover judgment flow
Understand algorithm of different handovers
Explain HO data configuration
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Contents
1. Introduction of Handover
2. HO Algorithm Ⅰ Process
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Purposes of HO
To keep a continuous communication with a moving MS
To improve network service performance
To reduce the call drop rate
To reduce the congestion rate
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Classification by Reason
No DL MR Emergency HO
Timing Advance (TA) HO
Interference HO
Rx_Level_Drop HO
Bad Quality (BQ) HO
Emergency HO
Enhanced Dual Band HO
Load HO
Normal HO
1
2
3
4
Classification by
ReasonEDGE HO
PBGT HO
Layer HO
MS Fast Moving HOConcentric Cell HO
AMR HO
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Classification by Synchronization
CELL
Case 1
Synchronous Handover: the target BTS shall not send PHY INFO message
Case 2
Asynchronous Handover: the target BTS shall send PHY INFO message
Case 3 Case 4Case 5
MSC
BSC
BTS
BSC BSC
MSC
BTS BTSBTS
BTS
NSS Network
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Classification by Equipment and
Channel
SDCCH → TCH
(Direct Retry)
SDCCH → SDCCH
Intra – Cell HO
Inter – Cell HO
Intra – BSC HO
Intra – MSC HO
Inter – MSC HO
TCH → TCH
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Contents
1. Introduction of Handover
2. HO Algorithm Process
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Contents
2. HO Algorithm Ⅰ Process
2.1 General HO Process
2.2 Measure and Measurement Result Report
2.3 Measurement Report Preprocessing
2.4 Handover Judgment
2.5 Handover Implementation
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General HO Process
MS Goes into New Dedicated Mode
MS Goes into Dedicated Mode
Measure and Measurement Result Report1
Measurement Report Preprocessing2
Handover Judgment3
Handover Implementation4
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General HO Process
MS Goes into New Dedicated Mode
MS Goes into Dedicated Mode
Measure and Measurement Result Report1
Measurement Report Preprocessing2
Handover Judgment3
Handover Implementation4
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The downlink measurement reportof the neighbor cell (BCCH)
Measurement Report
Uplink MR includes uplink receiving level and quality.
Downlink MR includes downlink receiving level, downlink
receiving quality of the serving cell and other downlink
receiving levels from the neighbor cells.
Serving cell
Neighbor cell
The uplink MR
The downlink MR
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Measurement Report
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Period of Measurement Report
The downlink MR is sent to BTS in SACCH uplink
The interval is 480ms/per time when MS is on TCH
The interval is 470ms/per time when MS is on SDCCH
12TCH 12TCH1SACCH 1 Idle
480ms 4 TCH Multi-frames
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General HO Process
MS Goes into New Dedicated Mode
MS Goes into Dedicated Mode
Measurement Report Preprocessing
Handover Judgment3
Handover Implementation4
Measure and Measurement Result Report1
2
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MR Preprocessing
MR Preprocessing
Interpolation
Recover the lost
measurement report
Filtering
Smooth the instantaneous
fading point
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MR Interpolation
MR
MR
No. n
No. n+4
MR
MR MR
Missing by
some reasons
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MR Filtering
MR
MR MR
MR
MR
Filter----Average several
consecutive MRs
MR
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Data Configuration of MR
Preprocessing
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Data Configuration of MR
Preprocessing
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Data Configuration of MR
Preprocessing
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Data Configuration of MR
Preprocessing
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General HO Process
MS Goes into New
Dedicated Mode
MS Goes into
Dedicated Mode
Measure and MeasurementResult Report
1
MR. Preprocessing2
Handover Judgment3
Handover Implementation4
TA HO
Interference HO
Rx_Level_Drop HO
Bad Quality HO
Load HO
Edge HO
Layer HO
PBGT HO
AMR HO
No DL MR HO
Concentric Cell HO
MS Fast Moving HO
Enhanced Dual Band HO
Penalty Processing
Ranking Processing
OM Forced HO
Direct Retry
Emergency HO
Normal HO
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Penalty Processing
Intra-cellHO
HO FailsEmergency
(TA&BQ)HO
MS Fast
Moving
HO
Concentric
Cell HO
Penalty
Punish on
the target
cell
Punish on the
original cell
Punish on other
high priority layercells
AMR HO
Fails
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Penalty for Handover Failure
Punish the target cell when a HO fails.
This is to avoid the MS to select this cell again in next HO judgment.
BSC punishes Cell D by
signal level valueCell A
Cell D
HO fails X
-80dBm
-75dBm
Within penalty time:-75dBm-30dB=-105dBm
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Data Configuration of Penalty for
Handover Failure
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Data Configuration of Penalty for
Handover Failure
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Penalty for Emergency Handover
Punish the original cell when an emergency HO ( due to BQ and
TA) occurs.
Cell A
Cell D
BQ or TA HO
MS successfully handovers from cell A to
cell D for BQ or TA, so original cell A
should be punished-80dBm
-75dBm
Within penalty time: -80dBm-63dB=-143dBm
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Data Configuration of Penalty for
Emergency Handover
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Data Configuration of Penalty for
Emergency Handover
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Back? No way!
Umbrella
Micro cell
Penalty for MS Fast-moving Handover
Giving penalty on the other three layers(Non-umbrella Layer ) afterMS handovers to Umbrella cell by fast-moving-HO.
This is to keep MS staying in the umbrella cell and avoid frequent
HO.
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Data Configuration of Penalty for MS
Fast-moving Handover
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Underlaid
Overlaid Do not attempt
again duringpenalty time
after one failedHO(O<->U)!
Penalty for Concentric Cell
A new concentric cell HO is prohibited within a penalty timeafter a concentric cell HO failure.
Do notattempt again
after N failedHO(U->O)!
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Data Configuration of Penalty for
Concentric Cell
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Underlaid
Overlaid
Do notattempt backtoo fast!
Penalty for Enhanced Concentric Cell
A new UO HO is prohibited within a penalty time after
a OU HO is performed successfully.
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Data Configuration of Penalty for
Enhanced Concentric Cell
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Penalty for Intra-cell HO
A new intra-cell HO is prohibited if it occurs too frequently.
3s 4s 5s 20s Duration (s)0
Penalty time
Intra-cellHO Time
2nd.3rd.
4th.
Max. consecutive HO times: 3
Forbidden time after Max. times: 20s
Interval for consecutive HO Jud: 6s
1st.
T
R
X1
T
R
X
2
T
R
X
3
T
R
X
4
T
R
X
5
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Data Configuration of Penalty for
Intra-cell HO
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Data Configuration of Penalty for AMR
FRHR Handover Failure
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General HO Process
MS Goes into New
Dedicated Mode
MS Goes into
Dedicated Mode
Measure and MeasurementResult Report
1
MR. Preprocessing2
Handover Judgment3
Handover Implementation4
TA HO
Interference HO
Rx_Level_Drop HO
Bad Quality HO
Load HO
Edge HO
Layer HO
PBGT HO
AMR HO
No DL MR HO
Concentric Cell HO
MS Fast Moving HO
Enhanced Dual Band HO
Penalty Processing
Ranking Processing
OM Forced HO
Direct Retry
Emergency HO
Normal HO
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Ranking Processing
M rule
K rule
Basic ranking
16 bits ranking
Network feature adjustment
The ranking result: target cell selection of handover
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M Rule
Begin
Finish to allneighbor cells?
No
Yes
the cell overload ? Yes
RX_LEV_DL(n) < [Min DL Power
on HO Candidate Cell](n)+
[Min Access Level Offset](s->n)?
RX_LEV_UL(n) < [Min UP Power on
HO Candidate Cell](n)+[Min Access Level Offset](s->n)?
Delete this cell from
the cell list
Yes
No
No
No
No
End
For service cell:
Min Access Level Offset=0
M rule will remove the cells fromthe candidate cell list whichunable to fulfill the conditionaccording to the flow.
Yes
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Data Configuration of M Rule
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Data Configuration of M Rule
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Network Feature Adjustment
After network feature adjustment, 16 bits value is calculated forevery candidate cells.
The smaller the value, the higher the handover priority and
ranking in the candidate cell list, and it is possible to be the
target cell.
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Network Feature Adjustment
The 1st
~3rd
bits
The bit value indicates the priority of downlink receiving level
according to the cell signal level and the penalty process taking
place beforehand.
The values come from max. 6 candidate cells and 1 serving cell
according to the level ranges from 000~110. The value for the
cell with the strongest signal level is 000, for the cell with
second strongest signal level is 001 and so on.
Actually that is the core of K rule.
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
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Cell A
Cell B
Cell C
Cell D
Cell E
Cell F
Cell S
-85dBm
-80dBm
-90dBm
-83dBm
-75dBm
-95dBm
-70dBm
3 2 1 RX_LEV Cell
-70dBm F
-75dBm D
-80dBm B
-83dBm C
-85dBm S
-90dBm A
-95dBm E
Candidate cell list
(high->low)
Question(The 1st~3rd Bits)
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Network Feature Adjustment
The 4th
bit: [Inter-cell HO hysteresis] bit.
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
serving cell?
Always set to 0
No
RX_LEV_DL (n) >=
RX_LEV_DL (s) +
[Inter-cell HO hysteresis] (s->n) ?
Yes
Set to 0 Yes
Set to1
No
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Cell A
Cell B
Cell C
Cell D
Cell E
Cell F
Cell S
-85dBm
-80dBm
-90dBm
-83dBm
-75dBm
-95dBm
-70dBm4 3 2 1 Current HO hys. RX_LEV Cell
-70dBm F
-75dBm D
-80dBm B
-83dBm C
-85dBm S
-90dBm A
-95dBm E
Candidate cell list
(high->low)
Question(The 4th Bit)
Suppose: [Inter-cell HO hysteresis] (s->n)=4
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Data Configuration of Inter-cell HO Hysteresis
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Network Feature Adjustment
The 5th
~10th
bits
The bit value is decided according to their position in Huawei
hierarchical network structure.
Huawei cell layers can be divided into 4 layers and each layer can
be further divided into 16 different priorities.
So there are 64 different priorities in Huawei hierarchical cell
structure.
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Player (0~3) Plevel (0~15)
Player_level (0~63)
level layer level layer P P P 16 _
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Hierarchical Cell Structure
GSM900 Cell
Micro Cell
Umbrella Cell GSM 900
GSM1800 GSM1800GSM1800
GSM 900
GSM900GSM900
GSM1800GSM1800
GSM1800 Cell
GSM 900
GSM900GSM900
GSM1800GSM1800
Layer 4
(low)
Layer 3
Layer 2
Layer 1
(high)
D t C fi ti f C ll Hi hi l
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Data Configuration of Cell Hierarchical
Network Structure
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Cell A
Cell B
Cell C
Cell D
Cell E
Cell F
Cell S
L3 P1
L3 P1
L2 P1
L2 P5
L1 P3
L3 P4
L2 P1
10 9 8 7 6 5 4 3 2 1 Cell
F
D
B
C
S
A
E
Candidate cell list(high->low)
Question(The 5th~10th Bits)
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Network Feature Adjustment
The 11
th
bit: The bit value is decided by cell-load-sharingcriterion.
This bit is affected by 14th bit.
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
System load>=[System Flux Threshold for Load HO](s)or [Load HO Allowed](s) =No ?
Yes 11th bit is
turned off
serving cell?
set to 0
No Yes
Cell load >= [Load
HO Threshold](s)?
set to 1 set to 1
cell load >=[ Load Req.
on Candidate Cell](n)?
set to 0
Yes
No
Yes
No
No
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Data Configuration of Cell-load-sharing
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Data Configuration of Cell-load-sharing
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Cell A
Cell B
Cell C
Cell D
Cell E
Cell F
Cell S
1
1
1
0
9 8 7 6 5 4 3 2 1 Cell
F
D
B
C
S
A
E
Candidate cell list(high->low)
Question(The 11th Bit)Suppose:system flow<[System Flux Threshold for Load HO](s) and
[Load HO Allowed](s) is “Yes”
Normal cell with few traffic
cell load(n) < [Load Req. on Candidate Cell](n)
Abmornal cell with heavy traffic
non-serving cell: load(n) >= [Load Req. on Candidate Cell](n)
serving cell: load(s) >= [Load HO Threshold](s)?
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Network Feature Adjustment
12th bit and 13th bit: Whether share the same BSC or MSC.
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
serving cell?NoYes
Both 12th and 13th set to 0
12th set to 113th set to 0
Is [Co-BSC/MSC Adj](s)yes?
Yes
No
Co-BSC?
Co-MSC?
No
Yes
12th set to 113th set to 1
No
Yes
Turn off
12th &13th bit
12th set to 013th set to 0
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Data Configuration of Co-BSC&MSC
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Cell A
Cell B
Cell CCell E
Cell F
Cell S
1
3
1
2
1
1
1
0
9 8 7 6 5 4 3 2 1 Cell
F
D
B
C
S
A
E
Candidate cell list(high->low)
Question(The 12th,13th Bit)
Cell D
BSC1
BSC2
MSC
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The 14th bit: [Inter-layer HO Threshold/Hysteresis] adjustment bit.
Network Feature Adjustment
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
The 15th/16th bits are reserved
Yes
serving cell?
set to 0
NoYes
Bit 14th set to 1, and bit
5th ~13th are turned off
set to 0
Yes
RX_LEV_DL >= [Inter-layer HOThreshold](s) – [Inter-layer HO Hysteresis](s)?
RX_LEV_DL >= [Inter-layer HOThreshold](n) + [Adjacent Cell Inter-layer HO
Hysteresis](s->n)?
No No
Data Configuration of Layer HO
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Data Configuration of Layer HO
Threshold Adjustment
Data Configuration of Layer HO
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Data Configuration of Layer HO
Threshold Adjustment
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-73dBm
Cell A
Cell B
Cell CCell E
Cell F
Cell S
Cell D
-90dBm
-80dBm
-83dBm
-75dBm
-70dBm
-85dBm
Candidate cell list(high->low)
[Inter-layer HO Threshold](s&n)=25
[Inter-layer HO Hysteresis](s&n)= 3dB
Serving cell’s threshold:-88dBm
Neighbor cell’s threshold:-82dBm
Question(The 14th Bit)
1
4
1
3
1
2
1
1
1
0
9 8 7 6 5 4 3 2 1 Cell
F
D
B
C
S
A
EGiven condition:
Then we can get:
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General HO Process
MS Goes into New
Dedicated Mode
MS Goes into
Dedicated Mode
Measure and MeasurementResult Report
1
MR. Preprocessing2
Handover Judgment3
Handover Implementation4
TA HO
Interference HO
Rx_Level_Drop HO
Bad Quality HO
Load HO
Edge HO
Layer HO
PBGT HO
AMR HO
No DL MR HO
Concentric Cell HO
MS Fast Moving HO
Enhanced Dual Band HO
Penalty Processing
Ranking Processing
OM Forced HO
Direct Retry
Emergency HO
Normal HO
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No DL MR HO
Serving Cell Neighboring Cell
When the quality of Um interface become worse and worse, itis for the worse uplink quality that MS can not deliver
downlink MR, while the downlink quality is not bad enough for
MS to receive the downlink message normally.
Baduplinkquality
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Position of No DL MR HO
MS Goes into New
Dedicated Mode
MS Goes into
Dedicated Mode
Measure and Measurement
Result Report1
MR. Preprocessing2
Handover Judgment3
Handover Implementation4
TA HO
Interference HO
Rx_Level_Drop HO
Bad Quality HO
Load HO
Edge HO
Layer HO
PBGT HO
AMR HO
Concentric Cell HO
MS Fast Moving HO
Enhanced Dual Band HO
Penalty Processing
Ranking Processing
OM Forced HO
Direct Retry
Emergency HO
Normal HO
No DL MR HO
Handover Due to No Downlink
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Handover Due to No Downlink
Measurement Report
Start
At least one
downlink MR is received?
No Dl Mr.HO
Allowed](s) is set to Yes ?
The numberof lost downlink MRs Cons.No
Dl Mr.HO AllowedLimit (s)?
Add handover cause
and check others
Yes
No
Check other
handover types
No
No
No
No downlink
information is in the current
MR?
Yes
Yes
Yes
No
Remove the serving cell from the
candidate cell list and check the cell with a
high priority for handover
All the candidate
cells are checked?
RXLEV(n) > RXLEV(s) +
Inter-cell Handover Hysteresis
(s->n)-BQ HO Margin(s->n)
Yes
No
Yes
No
The lost MR. number meetP/N rule?(For GBSS13.0)
Yes
Uplink quality
No Dl Mr.Ul Qual HO
Limit (s)
Yes
No Meet the P/N rule?
Check other
handover types
Handover Due to No Downlink
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Handover Due to No Downlink
Measurement Report – Data Configuration
Handover Due to No Downlink
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These two parameters are available from GBSS13.0.
Handover Due to No Downlink
Measurement Report – Data Configuration
Handover Due to No Downlink
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Handover Due to No Downlink
Measurement Report – Data Configuration
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Handover Due to No Downlink
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Handover Due to No Downlink
Measurement Report – Data Configuration
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TA(Time Advance) HO
Serving Cell Neighboring Cell
[TA Threshold](s)
Time
TA(s)
Handover
Triggering
[TA Threshold](n)
or
Handover Triggering Zone
TA(n)
TA(Ti Ad ) HO
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TA(Time Advance) HO
TriggerTA handover
Begin
The actual TA >= [TA Threshold](s)?
[TA HO Allowed]
Yes ?
Any neighbour cell
exist?
serving cell?
Select the cell with the
highest priority in the
cadidate cell list
Suitable cell
exist?
Yes
No
End
No
No
Yes Yes
No
No
Yes
Yes
Yes
No
[TA Threshold]
(n,in the same BTS)
<= [TA Threshold](s)
D t C fi ti f TA HO
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Data Configuration of TA HO
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I t f H d
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Interference Handover
Lev_Thr
Rx_Qual
RX_Lev
Qual_Thr
InterferenceOrigin
Serving Cell Neighboring Cell
Handover TriggeringZone
I t f HO
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Interference HO
Begin
UL or DL receiving
Quality(s)>=A?
[Interference HO
Allowed] Yes ?
Any neighbour cell
exist?
serving cell?
Select the cell with the
highest priority in the
cadidate cell list
Rx_Level(n)>=[Inter-layer HO Threshold](n) +
[Inter-layer HO Hysteresis](s->n)?
Yes
No
End
No
No
Yes No
No Yes
None AMR FR/HR:
A = RXQUALn, 1<=n<=12
AMR FR/HR:
A = RXQUAL1, n=1;
A = RXQUALn + RXLEVoff, 2<=n<=12
[Intracell HO Allowed](s) yes
& cell not punished?
Any suitable cell
exist?
Trigger
interference handover
No
Yes
Yes
Yes
Yes
No
D t C fi ti f I t f HO
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Data Configuration of Interference HOConfigured Value
(-110dBm)
Receiving Level (dBm) Receiving Quality
RXQUAL1 <=30 (-∞, -80] 60
RXQUAL2 =31 =-79 50
RXQUAL3 32~35 [-78, -75] 49
RXQUAL4 36~38 [-74, -72] 48
RXQUAL5 39~41 [-71, -69] 47
RXQUAL6 42~45 [-68, -65] 46
RXQUAL7 46~48 [-64, -62] 45
RXQUAL8 49~52 [-61, -58] 44
RXQUAL9 53~55 [-57, -55] 43
RXQUAL10 56~58 [-54, -52] 42
RXQUAL11 59~62 [-51, -48] 41
RXQUAL12 >=63 [-47, + ∞) 40
Default
ValuePar.
Par.Name
D t C fi ti f I t f HO
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Data Configuration of Interference HO
D t C fi ti f I t f HO
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Data Configuration of Interference HO
Q ti (I t f HO)
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Question(Interference HO)
1、Suppose: Current call is a normal FR call, data is configured be
default as before
[Interference HO Allowed]=Yes,
DL receiving level=-70dBm
DL receiving quality=5,
Question: Interference HO will be triggered or not?
2、If the call is AMR FR call, all the other is still the same, what will
happen?
Q estion(Interference HO)
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Question(Interference HO)
Candidate cell list(high-
>low) S F E D B C A
Suppose: Cell S’s quality is 7
1) [Intracell HO Allowed](s) is Yes,
which is the target cell?
2) [Intracell HO Allowed](s) is No,
which is the target cell?
Cell A
Cell B
Cell C
Cell D
Cell E
Cell F
Cell S
-85dBm
-80dBm
-90dBm
-83dBm
-75dBm
-73dBm
-70dBm
[Inter-layer HO Threshold](s/n)=25[Inter-layer HO Hysteresis](s/n) = 3dB
Neighbor cell threshold:-82dBm
Rx Level Drop HO
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Rx_Level_Drop HO
Rx Level Drop HO
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Rx_Level_Drop HO
Begin
Satisfy the Formula&
The latest RX_LEV_UL(s) <
[Edge HO UL RX_LEV Threshold](s)?
[Rx_Level_Drop HO
Allowed] Yes ?
Any neighbour cell
exist?
serving cell?
Select the cell with the
highest priority in the
cadidate cell list
Yes
No
End
No
No
Yes
No Yes
Formula:
Is priority higher than
serving cell?
Trigger
Rx_Level_Drop handover
Yes
Yes
B X A X A X A X A
X A X A X A X A
88776655
44332211
10101010
10101010
EndNo
D t C fi ti f R L l D HO
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Data Configuration of Rx_Level_Drop HO
Data Config ration of R Le el Drop HO
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Data Configuration of Rx_Level_Drop HO
BQ(Bad Quality) HO
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BQ(Bad Quality) HO
Begin
Is [BQ HO Allowed]
Yes ?
Any neighbour cell
exist?
serving cell?
Select the cell with the
highest priority in the
cadidate cell list
Yes
No
End
No
No
Yes
No Yes
Yes
UL_Rx_Q(s)>=[UL Qual.
Threshold](s) or DL _ Rx _ Q(s)>=[DL Qual. Threshold](s)?
RX_LEV_DL (n) > RX_LEV_DL (s)
+ Inter-cell HO hysteresis(s->n)
-BQ HO Margin(s->n) ?
[Intracell HO Allowed](s) yes
& cell not punished?
Suitable cellexist?
Trigger
BQ handover
Yes
Yes
Yes
No
No
No
Data Configuration of BQ HO
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Data Configuration of BQ HO
Data Configuration of BQ HO
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Data Configuration of BQ HO
Data Configuration of BQ HO
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Data Configuration of BQ HO
General HO Process
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General HO Process
MS Goes into New
Dedicated Mode
MS Goes into
Dedicated Mode
Measure and MeasurementResult Report
1
MR. Preprocessing2
Handover Judgment3
Handover Implementation4
TA HO
Interference HO
Rx_Level_Drop HO
Bad Quality HO
Load HO
Edge HO
Layer HO
PBGT HO
AMR HO
No DL MR HO
Concentric Cell HO
MS Fast Moving HO
Enhanced Dual Band HO
Penalty Processing
Ranking Processing
OM Forced HO
Direct Retry
Emergency HO
Normal HO
Enhanced Dual Band HO
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Enhanced Dual Band HO
Two single band cells which are configured as bi-directional
neighbor cell relationship can be configured as enhanced dual
band cell to each other.
Purpose
During the procedure of channel assignment and handover,the two single band cells can share their resource.
Assign the channel with low load in UL to MS preferentially.
Make MS handover from the high load cell to the low load
cell.
Channel Assignment of Enhanced Dual Band
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Channel Assignment of Enhanced Dual Band
RX_LEV_OL>= [Incoming OL Subcell HO level Threshold(dB)](o) andRX_LEV_UL – RX_LEV (n) >[Distance Between Boundaries of UL and OL Subcells(dB)]
Attention:
RX_LEV (n): RX_LEV of the strongest neighboring cell which has the same frequency band and layer
with underlaid subcell, but locates in a different BTS. If there is no such a cell, this value is -110dBm
If [ATCBHoSwitch] is [Close], the second condition is turn off.
A:
TCH assignment (SDCCH channel in UL)
Beginfrom UL
[UL Subcell AssignmentOptimization(u) ?
Cell load of UL >
[UL Subcell General
Overload Threshold(%)](u)?
Yes
A
Yes
No
Any idle TCH
Available in OL?
Assign TCH
in OL
Yes
No
Yes
Assign TCH in UL
or direct retry identification
or queuing
No
No
Data Configuration of Channel
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Assignment
Data Configuration of Channel
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Assignment
Channel Assignment of Enhanced Dual Band
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Begin
from OL
[OL Subcell AssignmentOptimization) No ?
Cell load of UL<
[UL Subcell Lower
Load Threshold](u)?
Yes
Yes
No
Assign TCH
in UL
Any idle TCH
Available in UL?
Assign TCH
in UL
Any idle TCH
Available in OL?
Assign TCH
in OL
Yes No
Yes
Assign TCH in OL
or direct retry identificationor queuing
No
No
TCH assignment (SDCCH channel in OL)
Channel Assignment of Enhanced Dual Band
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Enhanced Dual Band HO
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Enhanced Dual Band HO
Classification of TCH HO in enhanced dual band HO
OL to UL
for low load in UL
UL to OL
for high load in ULand moving
OL to UL for moving
Enhanced Dual Band HO(UO )
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Enhanced Dual Band HO(UO )
Triggering condition for TCH Load HO from UL to OL for high load in
UL
Enhanced Dual Band HO(UO ) Triggering condition for TCH Load HO from UL to OL for high load in
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Triggering condition for TCH Load HO from UL to OL for high load in
UL
RX_LEV_UL – RX_LEV (n) > [Distance Between Boundaries of UL and OL Subcells(dB)]+
[Distance Hysteresis Between Boundaries of UL and OL Subcells(dB)]
A:
Cell load of UL>=[UL SubcellSerious Overload Threshold(%)](u)?
Begin[Load HO From UL Subcell
to OL Subcell Allowed](u) Yes ?
Cell load of UL>=[UL SubcellGeneral Overload Threshold(%)](u)?
and
No
Satisfy P/N?
Trigger
UL to OL
Yes No
Adjust HO zone basing
on HO step and HO period
BB-C
Yes
Any MS in HO zone?
Yes
No
Yes
Yes
No
End
Cell load of OL<=[Inner Cell Serious Overload Threshold(%)](o)?
Yes Yes
No
Is the system traffic of current cell<=[Allowed Flow Control Level of UL
and OL Subcell HO]?
RX_LEV_OL >= [Incoming OL Subcell
HO level Threshold(dB)] (o)?
A
No
No
No
Yes
Data Configuration of Enhanced Dual
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Band HO(UO )
Data Configuration of Enhanced Dual
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Band HO(UO )
Enhanced Dual Band HO(OU )
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Enhanced Dual Band HO(OU )
Triggering condition for TCH HO from OL to UL for moving
RX_LEV_UL – RX_LEV (n) < [Distance Between Boundaries of UL and OL Subcells(dB)] –
[Distance Hysteresis Between Boundaries of UL and OL Subcells(dB)]
A:
Satisfy P/N?
Begin
AYes
End
Trigger
OL to UL
Yes
Select Neighbor cell
with the highest priority
No
YesNo
[Inner Cell EDGE HOEnable](o) Yes ?
RX_LEV_OL <[Outgoing OL Subcell HO levelThreshold(dB)](o)
Yes
No
No
The target cell could be underlaid
subcell or normal neighboring cell
Data Configuration of Enhanced Dual
B d HO(OU )
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Band HO(OU )
Enhanced Dual Band HO(OU )
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Enhanced Dual Band HO(OU )
Triggering condition for TCH Load HO from OL to UL for low load in UL
Enhanced Dual Band HO(OU )
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Enhanced Dual Band HO(OU )
Triggering condition for TCH Load HO from OL to UL for low load in
UL
HO zone: [Outgoing OL Subcell HO Level Threshold(dB)](o) ~ -47dBm
HO step: [Step Length of OL Subcell Load HO(dB)](o)
A: RX_LEV_UL >= Inter-layer HO Threshold(u) + Inter-layer HO Hysteresis(o->u)
Begin
[Load HO of OL Subcellto UL Subcell Enable](o) Yes ?
Cell load of UL <[UL Subcell
Lower Load Threshold(%)](u)?
Yes
No
End
Satisfy P/N?
Yes
No
The object cell must be
the underlaid subcell
and satisfy condition A
Any MS in HO zone?
Yes
Trigger OL to UL
No
YesNo
Adjust HO zone basing
on HO step and HO period
Is the system traffic of currentcel<=[Allowed Flow Control Level
of UL and OL Subcell HO]?
RX_LEV_OL >= [Outgoing OL SubcellHO level Threshold(dB)] (o)?
No
Yes
Yes
No
Data Configuration of Enhanced Dual
B d HO(OU )
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Band HO(OU )
General HO Process
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General HO Process
MS Goes into New
Dedicated Mode
MS Goes into
Dedicated Mode
Measure and MeasurementResult Report
1
MR. Preprocessing2
Handover Judgment3
Handover Implementation4
TA HO
Interference HO
Rx_Level_Drop HO
Bad Quality HO
Load HO
Edge HO
Layer HO
PBGT HO
AMR HO
No DL MR HO
Concentric Cell HO
MS Fast Moving HO
Enhanced Dual Band HO
Penalty Processing
Ranking Processing
OM Forced HO
Direct Retry
Emergency HO
Normal HO
Load HO
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Load HOHandover triggering zone
[Load HO Threshold]
Time
Load of Serving Cell
[Load Req. on Candidate Cell]
Load of Neighboring Cell
Congested Cell
Congested Cell
Congested CellNormal Cell
Normal CellNormal Cell
Normal Cell
Load HO
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oad O
As load HO may trigger several HOs, the CPU load
(system flow level) must be considered before the
feature is triggered.
In addition, load HO is executed step by step, that is,
from the edge HO thrsh. raises according to certain step
and period.
The process will be stopped when the Load HO Zone is
reached the threshold.
Load HO
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Load HO
Congested Cell
Normal Cell
Normal Cell
Normal Cell
Load HO
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Begin
[Load HO Allowed] (s)
Yes ?
BSC internal cell?
Select the cell with the highest
priority in the cadidate cell list
End
No
No
Yes
No Yes
Yes
Current system flux<=[System Flux Threshold
for Load HO](s)?
C & D
Suitable cellexist?
Trigger
load handover
Yes
Yes
Yes
EndNo
Load of service cell >=[Load HO Threshold](s)?
Yes
No
Yes
Load HO timerT overflow?
Yes
Step Period
T )1( [Load HO Bandwidth](s)
B
Yes
serving cell?
No
No
B: [Edge HO_DL_RX_LEV Threshod](s)<DL_RX_Lev(s)
< [Edge HO_DL_RX_LEV Threshod](s)+A
C: RX_LEV (n)>= [Inter-layer HO Threshold](n) +
[Inter-layer HO Hysteresis](s->n)D: load(n)< Load Req. on Candidate Cell(n)
Step: [Load HO Step Level](s)
Period: [Load HO Step Period](s)
CNo
A=
No
Yes
Load HO timerT begin?
No
No
Star timer T
Period Step
T AStep )1Bandwidth]HO[Load
(0 Bandwidth]HO[LoadA T
Yes
A=
Data Configuration of Load HO
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g
General HO Process
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MS Goes into New
Dedicated Mode
MS Goes into
Dedicated Mode
Measure and MeasurementResult Report
1
MR. Preprocessing2
Handover Judgment3
Handover Implementation4
TA HO
Interference HO
Rx_Level_Drop HO
Bad Quality HO
Load HO
Edge HO
Layer HO
PBGT HO
AMR HO
No DL MR HO
Concentric Cell HO
MS Fast Moving HO
Enhanced Dual Band HO
Penalty Processing
Ranking Processing
OM Forced HO
Direct Retry
Emergency HO
Normal HO
Edge Handover
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g
HandoverTriggering
P/ N
Serving Cell Neighboring Cell
P: Valid TimeN: Watch Time
RX_LEV Thr
Time
RX_Lev
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Data Configuration of Edge HO
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g g
Should be lower than the[Outgoing OL
Subcell HO Level Threshold(dB)] in enhance
dual band data table
[Edge HO UL/DL RX-LEV
Threshold]<[UL/DL RX_LEV Lower
Threshold] in HWII/III power control table
Data Configuration of Edge HO
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g g
Data Configuration of Edge HO
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g g
MS Fast-Moving Handover
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g
TimeThreshold
Fast-Moving
Handover Triggering
2 311
P/NP: Watch CellsN: Valid Cells
Time
Cells Number
Umbrella Cell
Micro Cell
MS Fast-Moving Handover
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Begin
[MS Fast Moving HO
Allowed](s) Yes ?
End
No
Yes
Yes
the serving
cell on layer 4?
Satisfy P / N rule?No Select the neighbor cell with the highest priority &
on the 4th layer & satisfy RX_LEV(n)>= [Inter-layer
HO threshold](n) + [Inter-layer HO hysterisis](s->n)
Any cell satisfy the
condition above?
Trigger MS fast-
moving handover
No
Yes
Refresh timer(s)
No
Yes
Data Configuration of MS Fast-moving
Handover
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Handover
Layer HO
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Neighboring CellServing Cell
GSM900 Cell
Lay 3 GSM1800 Cell
Lay 2
Layer HO
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Begin
[Level HO
Allowed](s) Yes ?
End
No
Yes
Yes
Any neighbor cell exit?
16 bit value(n)<16 bit value(s)?
A & ( layer(n)< layer(s)or level(n)<level(s) )?
Satisfy P/N rule(n)?
No
Trigger
layer handover
Yes
No
Yes
No
A: RX_LEV(n)>= [Inter-layer HO threshold](n)
+ [Adjacent Cell Inter-layer HO Hysteresis](s->n)
Yes
Identify the next cell
No
Data Configuration of Layer HO
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Data Configuration of Layer HO
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Data Configuration of Layer HO
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PBGT HOHandover
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Serving Cell Neighboring Cell
PBGT HOThreshold
Time
Path Loss (dB)
126dB119dB
5
126-119=7dB>5dB
HandoverTriggering
P /N P: Valid Ti me
N: Watch Time
PBGT HO
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Begin
[PBGT HO
Allowed] (s)Yes ?
End
No
Yes
current channelsignaling channel?
Satisfy P / N rule?
No
Yes
layer(n)=layer(s)&level(n)=level(s)?
Path loss (s) – Path loss (n)>PBGT HO Threshold(s->n)
TriggerPBGT HO
Yes
No
Yes
Yes
No
NOTES: whichever the greater of the
[inter-cell HO hysteresis] and
[PBGT HO threshold], that value will be
used in the PBGT HO.
16 bit value(n)<16 bit value(s)?
Yes
Identify thenext cell
No
No
Data Configuration of PBGT HO
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Data Configuration of PBGT HO
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Concentric Cell
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Purposes
Maximize coverage area
Reduce interference and improve frequency reuse density
Construction methods
Different combiner loss Different propagation loss
Modify the transmission power of TRX, the down tilt of antennas, etc.
By HO parameters
Overlaid
Underlaid
Classification and HO Judgment of
Concentric Cell
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Concentric Cell
Receiving level
Time advance
Quality
…
Receiving level
Time advance
Quality
ATCB
Cell load of underlaid
… Normal concentric cell Enhance concentric cell
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Normal Concentric Cell HO
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Division of underlaid and overlaid is decided by MS downlink
receive level ,TA value and quality.
underlaid
overlaid
Receiving Level Threshold
Receiving Level Hysteresis
Receiving Qaulityl Threshold
TA Threshold
TA Hysteresis
Normal Concentric Cell HO
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U to O O to U
Normal Concentric Cell HO(OU )
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Flow for TCH HO from overlaid to underlaid
Begin within Penalty Time End Yes
No
[RX_LEV for UOHO Allowed] Yes?
Yes
[OL to UL HO
Allowed] Yes ?
No
Yes
[RX_QUAL for UOHO Allowed] Yes?
Yes
Rx_Dl_Quality>=[RX_QUAL Treshold]?
Current TA>=[TA Threshold]+[TA Hysteresis]?
[TA for UO HOAllowed] Yes?
Trigger OL to UL
P/N rule?
Yes Yes
Yes
Yes
No
NoNo
No No No
End
Rx_Dl_Level<=[RX_LEV thshold]-[RX_LEV Hysteresis]
No Yes
Normal Concentric Cell HO(UO )
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Criterion for TCH HO from underlaid to overlaid
Begin
With Penalty Time ? End Yes
No
Current TA<=[TA Threshold]-[TA Hysteresis]?
[RX_QUAL for UOHO Allowed] Yes?
Yes
Yes
No
No[RX_LEV for UOHO Allowed] Yes?
Rx_Dl_Level >=[RX_LEV Threshold] +
[RX_LEV Hysteresis]No
[TA for UO HOAllowed] Yes?
Rx_Dl_Qual<=[RX_QUAL Treshold]?
Yes
P/N rule?
Yes
No
No
No
Yes
Yes
No
[UL to OL HO
Allowed] Yes ?
End
Yes
No
Trigger UL to OL
Data Configuration of Normal
Concentric Cell HO
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Co ce c Ce O
Data Configuration of Normal
Concentric Cell HO
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Data Configuration of Normal
Concentric Cell HO
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Enhance Concentric Cell HO
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Division of underlaid and overlaid is decided by MS downlink
receive level, quality, TA value and cell load of underlaid.
underlaid
overlaid
U to O HO Receiving Level Threshold
O to U HO Receiving Level Hysteresis
Receiving Qaulityl Threshold
TA Threshold
TA Hysteresis
Enhance Concentric Cell HO
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Classification of TCH HO in enhance concentric cell HO
O to U
for low load in U
U to O
for high load in U
O to U
for moving
ATCB Principle
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Neighboring
cell
Rxlev(n) = -80 dBm
Rxlev(UL) = -80 dBm
Serving cell
Rxlev(n) = -82 dBm
Rxlev(UL) = -78 dBm
A call is handed overto the OL subcell
Rxlev(n) = -80 dBm
Rxlev(UL) = -80 dBm
Neighboring
cellServing cell
Rxlev(n) = -82 dBm
Rxlev(UL) = -78 dBm
A call is handed overto the OL subcell
RX_LEV (n): RX_LEV of the
strongest neighboring cell
which has the samefrequency band and layer
with underlaid subcell, but
locates in a different BTS. If
there is no such a cell, this
value is -110dBm
Enhance Concentric Cell HO(UO ) Flow for TCH HO from underlaid to overlaid for high load in UL
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A: RX_LEV_UL – RX_LEV (n) >[Distance Between Boundaries of UL and OL Subcells(dB)] [Distance
Hysteresis Between Boundaries of UL and OL Subcells(dB)]
RX_LEV (n): RX_LEV of the strongest neighboring cell which has the same frequency band and layer
with underlaid subcell, but locates in a different BTS. If there is no such a cell, this value is -110dBm
Begin
Within Penalty Time ? End Yes
No
Current TA<[TA Threshold]-[TA Hysteresis]?
[ATCBHoSwitch] Open?
[RX_QUAL for UOHO Allowed] Yes?
Go to the user selectionflow in the next slide
Yes
Yes
No
No[RX_LEV for UOHO Allowed] Yes?
Rx_Dl_Level>[UtoO HOReceived Level Threshold]
No
A Yes
No
[TA for UO HOAllowed] Yes?
Rx_Dl_Qual<[RX_QUAL Treshold]?
Yes
P/N rule? Yes
No
No
No
No
Yes
Yes
Yes
Yes
[UL to OL HOAllowed] Yes ?
End
Yes
No
Enhance Concentric Cell HO(UO )
(Con.)
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( ) User selection flow from UL to OL for high load in UL
Cell load of UL>=[En Iuo Out
Cell Serious OverLoad Thred]?
Begin[UtoO Traffice
HO Allowed] Yes ?
Cell load of UL>=[En Iuo Out
Cell General OverLoad Thred]?
TriggerUL to OL
Yes No
Adjust HO zone basing
on HO step and HO period
Refresh cell load
per second
B(B-1)/second
Yes
B=[Underlay HO Step Period(s)]
HO step: [Underlay HO Step Level]
HO period: B-x or B
HO zone: begin from -47dBm
Any MS in HO zone?
Yes
No
Yes
No
End
No
Enhance Concentric Cell HO(OU )
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Flow for TCH HO from overlaid to underlaid for low load in underlaid
HO period: [En Iuo in Cell Load Classification HO Period]
HO step: [En Iuo in Cell Load Classification HO Step]
HO zone: begin from [OtoU HO Received Level Threshold] to -47dBm
Begin[[OL to UL HO
Allowed] Yes ?
Cell load of UL<[En Iuo Out
Cell Low Load Thred]?
No
TriggerUL to OL
Adjust HO zone basing
on HO step and HO periodRefresh cell loadper second
Yes
Any MS in HO zone?
Yes
No
Yes
No
End
The object cell must be
the underlaid subcell
Enhance Concentric Cell HO(OU ) Flow for TCH HO from overlaid to underlaid for moving
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No
Begin With Penalty Time ? End Yes
No
[ATCBHoSwitch]Open?
No[RX_LEV for UOHO Allowed] Yes?
Rx_Dl_Level<[OtoU HOReceived Level Threshold]
A
Yes
[OL to UL HOAllowed] Yes ?
No
Yes
[RX_QUAL for UOHO Allowed] Yes?
Yes
Rx_Dl_Qual>[RX_QUAL Treshold]? Current TA>[TA Threshold]+
[TA Hysteresis]?
[TA for UO HOAllowed] Yes?
Trigger OL to UL
P/N rule?
Select the underlaid subcell orthe neighbour cell with thehighst priority in 16 bits list
Yes Yes Yes
Yes
No
Yes
No No
No No
NoEnd
A: RX_LEV_UL – RX_LEV (n) < [Distance Between Boundaries of UL and OL Subcells(dB)]
[Distance Hysteresis Between Boundaries of UL and OL Subcells(dB)]
RX_LEV (n): RX_LEV of the strongest neighboring cell which has the same frequency band and layer
with underlaid subcell, but locates in a different BTS. If there is no such a cell, this value is -110dBm
The object cell could be
underlaid subcell or
normal neighboring cell
Data Configuration of Enhance
Concentric Cell HO
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Data Configuration of Enhance
Concentric Cell HO
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Data Configuration of Enhance
Concentric Cell HO
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Data Configuration of Enhance
Concentric Cell HO
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Data Configuration of Enhance
Concentric Cell HO
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Data Configuration of Enhance
Concentric Cell HO
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Channel Assignment strategies of
Concentric Cell
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Channel Assignment Strategies of Concentric Cell
Immediate
AssignmentAssignment
Intra-BSC
Inter-cell
Handover
Incoming
Cell
Handover
Immediate Assignment
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The preferred SDCCH channel in two layers is controlled by
parameter “TA pref. Of Imme- Assign Allowed ”
If "No", system prefers the channel in Underlaid subcell
If “Yes", system prefers the channel according to in Channel
Request message
TA smallerTA bigger
Data Configuration of Immediate
Assignment
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Assignment
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Preferred assignment in the overlay or underlay cell
Assign the channel of overlay or underlay cell
according to the Rx_level and TA in the measurement
report
TA smaller and
Rx level higher
Data Configuration of Assignment
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Intra-BSC Inter-Cell Handover
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In the case of intra-BSC inter-cell handover, the MS can be
handed over to the underlay or overlay cell first.
If “System Optimization” is selected, the preferred assignment
is conducted according to the level value in the measurement
report.
overlaid
Underlaid
Overlaid
According to the Rx-level
Data Configuration of Intra-BSC Inter-
Cell Handover
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Inter-BSC Handover
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For the inter-BSC Handover, if the target cell is concentric cell ,
the channel of underlay cell should be assigned first.
overlaid
Underlaid
Overlaid
BSC1 BSC2
Assign underlaid first
Data Configuration of Inter-BSC Inter-
Cell Handover
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AMR Handover FlowBegin
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g
Is [Intracell F-H HO
Allowed] Yes ?
Yes
Is current channelTCH & version3?
No
A: Cell load > [AMR TCH/H Prior
Cell Load Threshold]
During [Penalty Time
after AMR TCHF-H HOFail(s)]?
Yes
Yes
current channel is FR
Satisfy P/N rule?Trigger internal cell
AMR handover
Yes
NoEnd
RQI/2 >[F2H HO th] & A RQI/2 <[H2F HO th] End
Yes Yes
NoNo
No
No
No
Yes
Data Configuration of AMR HO
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Data Configuration of AMR HO
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General HO Process
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MS Goes into New Dedicated Mode
MS Goes into Dedicated Mode
Measure and Measurement Result Report1
Measurement Report Preprocessing2
Handover Judgment3
Handover Implementation4
Handover Implementation
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Begin
Is [Power ForecastAllowed](s) Yes ?
BSC predict power
YesNo
BSC send “HO
Command” to MS
HO execute
MS uses the highestpower to access For MS
MS will use this predict
power to access the
target cell
Data Configuration of Handover
Implementation(MS)
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Summary
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In this course, we have learned:
Classification of HO
HO general procedure
HO judgment algorithmⅠ HO implementation process
HO data configuration
Question
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Question
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Please answers the following questions:
1. What’s the neighbour cell sequence basing on MS
measurement report?
2. What’s the neighbour cell sequence on BSC after 16-bit
ranking?
3. What cell is the target cell? and what’s the handover type?
Answer(The 1st~3rd Bits)
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Cell A
Cell B
Cell C
Cell D
Cell E
Cell F
Cell S
-85dBm
-80dBm
-90dBm
-83dBm
-75dBm
-95dBm
-70dBm
3 2 1 RX_LEV Cell
0 0 0 -70dBm F
0 0 1 -75dBm D
0 1 0 -80dBm B
0 1 1 -83dBm C
1 0 0 -85dBm S
1 0 1 -90dBm A
1 1 0 -95dBm E
Candidate cell list(high->low) F D B C S A E
Answer(The 4th Bit)
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Cell A
Cell B
Cell C
Cell D
Cell E
Cell F
Cell S
-85dBm
-80dBm
-90dBm
-83dBm
-75dBm
-95dBm
-70dBm
4 3 2 1 Current HO hys. RX_LEV Cell
0 0 0 0 15dB -70dBm F
0 0 0 1 10dB -75dBm D
0 0 1 0 5dB -80dBm B
1 0 1 1 2dB -83dBm C
0 1 0 0 0 -85dBm S
1 1 0 1 -15dB -90dBm A
1 1 1 0 -10dB -95dBm E
Candidate cell list
(high->low)
F D B C S A E
F D B S C A E
Answer(The 5th~10th Bits)
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Cell A
Cell B
Cell C
Cell D
Cell E
Cell F
Cell S
L3 P1
L3 P1
L2 P1
L2 P5
L1 P3
L3 P4
L2 P1
1
0
9 8 7 6 5 4 3 2 1 Cell
0 1 0 0 0 0 0 0 0 0 F
0 0 0 0 1 0 0 0 0 1 D
1 0 0 0 0 0 0 0 1 0 B
0 1 0 1 0 0 1 0 1 1 C
1 0 0 0 0 0 0 1 0 0 S
0 1 0 0 0 0 1 1 0 1 A
1 0 0 0 1 1 1 1 1 0 E
Candidate cell list
(high->low)
F D B C S A E
F D B S C A E
D F A C B S E
Answer(The 11th Bit)Suppose:system flow<[System Flux Threshold for Load HO](s) and [Load
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Cell A
Cell B
Cell C
Cell D
Cell E
Cell F
Cell S
1
1
1
0
9 8 7 6 5 4 3 2 1 Cell
0 1 0 0 0 0 1 0 0 0 0 F
0 0 1 0 0 1 1 0 0 0 1 D
0 1 1 0 0 0 1 0 0 1 0 B
1 1 0 0 1 0 1 1 0 1 1 C
1 1 1 0 0 0 1 0 1 0 0 S
1 1 0 0 0 0 1 1 1 0 1 A
1 1 1 0 1 0 0 1 1 1 0 E
Candidate cell list
(high->low)
F D B C S A E
F D B S C A E
D F A C B S E
D F B A C S E
HO Allowed](s) is “Yes”
Normal cell with few traffic
cell load(n) < [Load Req. on Candidate Cell](n)
Abmornal cell with heavy traffic
non-serving cell: load(n) >= [Load Req. on Candidate Cell](n)
serving cell: load(s) >= [Load HO Threshold](s)?
1 1 1 1 9 8 7 6 5 4 3 2 1 C ll
Answer(The 12th,13th Bit)
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Cell A
Cell B
Cell CCell E
Cell F
Cell S
1
3
1
2
1
1
1
0
9 8 7 6 5 4 3 2 1 Cell
0 0 0 1 0 0 0 0 1 0 0 0 0 F
0 1 0 0 1 0 0 1 1 0 0 0 1 D
0 1 0 1 1 0 0 0 1 0 0 1 0 B
0 1 1 1 0 0 1 0 1 1 0 1 1 C
0 0 1 1 1 0 0 0 1 0 1 0 0 S
0 0 1 1 0 0 0 0 1 1 1 0 1 A
0 0 1 1 1 0 1 0 0 1 1 1 0 E
Candidate cell list(high->low)
F D B C S A E
F D B S C A E
D F A C B S E
D F B A C S E
F A S E D B C
Cell D
BSC1
BSC2
MSC
Answer(The 14th Bit)
1 1 1 1 1 9 8 7 6 5 4 3 2 1 C ll
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-73dBm
Cell A
Cell B
Cell CCell E
Cell F
Cell S
Cell D
-90dBm
-80dBm
-83dBm
-75dBm
-70dBm
-85dBm
Candidate cell list(high->low)
F D B C S A E
F D B S C A E
D F A C B S E
D F B A C S E
F A S D B C E
F S E D B C A
1
4
1
3
1
2
1
1
1
0
9 8 7 6 5 4 3 2 1 Cell
0 0 0 0 1 0 0 0 0 1 0 0 0 0 F
0 0 1 0 0 1 0 0 1 1 0 0 0 1 D
0 0 1 0 1 1 0 0 0 1 0 0 1 0 B
1 0 1 0 1 1 C
0 0 0 1 1 1 0 0 0 1 0 1 0 0 S
1 0 1 1 0 1 A
0 0 0 1 1 1 0 1 0 0 1 1 1 0 E
[Inter-layer HO Threshold](s&n)=25
[Inter-layer HO Hysteresis](s&n)= 3dB
Serving cell’s threshold:-88dBm
Neighbor cell’s threshold:-82dBm
Given condition:
Then we can get:
Answer(TA HO)
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TA=2
Cell A
Cell B
Cell CCell E
Cell F
Cell S
Cell D
TA=3
TA=5
TA=4
TA=3
TA=0
TA=1
Candidate cell list(high->low) F S E D B C A
Which cell is the target cell?
Target cell is cell E
Answer(Interference HO)
Cell ASuppose: Cell S’s quality is 7
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Candidate cell list(high-
>low) S F E D B C A
Cell B
Cell C
Cell E
Cell F
Cell S
-85dBm
-80dBm
-90dBm
-83dBm
-75dBm
-73dBm
-70dBm
Suppose: Cell S s quality is 7
1) [Intracell HO Allowed](s) is Yes ,which is the target cell?
Answer: Intra cell HO, andtriggering sequence: differentfrequency band ->different TRX-
>different TS2) [Intracell HO Allowed](s) is No ,
which is the target cell?
Answer: Cell F
[Inter-layer HO Threshold](s/n)=25
[Inter-layer HO Hysteresis](s/n) = 3dB
Neighbor cell threshold:-82dBm
Question
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Pl th f ll i ti
Question
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Please answers the following questions:
1. What’s the neighbour cell sequence basing on MS
measurement report?
2. What’s the neighbour cell sequence on BSC after 16-bit
ranking?
3. What cell is the target cell? and what’s the handover type?
Answer
1 What’s the neighbour cell sequence on MS (on MS measurement
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1. What s the neighbour cell sequence on MS (on MS measurement
report)?
Cell Band Rx_Level(-dBm)
(Serving cell)A 900 -86
C 900 -66
F 900 -69
B 1800 -73
D 1800 -81
E 900 -72
H 900 -84
2 MBR
Answer2. What’s the neighbour cell sequence on BSC from 16-bit rule point of
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view?
Cell14t
h12th 10th 4th 1st~3rd
Sweving
Cell A1 0 0 0 -86(110)
C 0 1 1 0 -66(000)
F 0 0 1 0 -69(001)
B 0 1 0 0 -73(011)
D 1 0 0 0 -81(100)
E 0 0 1 0 -72(010)
H 1 0 0 1 -84(101)
Cell14t
h12th 10th 4th 1st~3rd
F 0 0 1 0 -69(001)
E 0 0 1 0 -72(010)
B 0 1 0 0 -73(011)
C 0 1 1 0 -66(000)
D 1 0 0 0 -81(100)
Serving
Cell A1 0 0 0 -86(110)
H 1 0 0 1 -84(101)
Before 16 bits ranking After 16 bits ranking
3 What cell will be chosen by MS for handover and what’s the handover
Answer
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3. What cell will be chosen by MS for handover and what s the handover
type? It’s clear that F cell will be chosen for target. And it will be PBGT
handover, because only PBGT conditions are met:
The layer and level of the object cell are the same as those of the service cell.
Satisfy Path loss (s) – Path loss (n) >PBGT HO Threshold or RxLev (serving) –
RxLev (candidate)>PBGT HO Thrsh.
In our case PBGT HO Thrsh=68=4 dB and cell layer serving and neigboor cells
are the same.
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