Huawei Parameter Strategy Guide for Traffic Balancing

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Security Level:
www.huawei.com
Huawei Parameter Strategy

HUAWEITECHNOLOGIES CO., LTD. Huawei Confidential
www.huawei.com
Contents
Traffic Share Solution
Idle Mode & Call Control
Handover
2G/3G Interoperability
Power Control

• Recommended solutions for Traffic Balancing
I. In case of GSM900 and DCS1800 co-location, the GSM900 has strong signal
strength but we can use the idle parameter setting and handover to control the
traffic and achieve the balanced traffic between GSM900 and DCS1800
II. In case of 2G and 3G co-location, we can use the idle parameter setting and
handover to control the traffic and achieve the balanced traffic between 2G
and 3G
a. Set proper cell selection and reselection parameters
b. Utilize proper cell layer settings and other handover parameters
c. Control idle mode MS behavior, optimize handover settings to achieve proper
traffic load sharing
d. other

 Hierarchical strategy for GSM900 and GSM1800
The layer of GSM 1800 cell is higher than
the layer of GSM 900 cell.
① In idle mode, the MS stay in the GSM
900 cell B by setting the cell selecting or
cell reselecting parameters.
② When the DL signal level is good
enough to reach the threshold, the MS is
triggered the Layer HO to GSM 1800 cell
B.
③-1 Because the moving of Ms, the
UL/DL signal level become worse. When
UL/DL RxLevel is lower than the
threshold, the MS is triggered Edge HO to
GSM 900 cell B.
③-2 In oder to avoiding congestion of
GSM 1800 cell, the Load HO can be used
to share some traffic to GSM 900 cell.
Cell B
GSM 900
【 Inter-layer HO threshold 】 +64- 【 Inter-layer HO hysteresis 】
【 Edge HO
Threshold 】
Cell A
GSM 1800
①
Cell select/
cell reselect
②Layer HO
③
Edge HO/Load HO
The MS in this zone are
difficult to be triggered
handover from GSM
1800 cell to GSM 900
cell.

• Strategy for 2G/3G Interoperability
For the areas covered by both the GSM network and the UMTS
network,2G/3G interoperability can be performed to achieve traffic balance
between the GSM and UMTS.
I.Only suggest to active the cell reselection from 2G to 3G.
II.Both cell reselection and handover are suggested from 3G to 2G.
a.Cell reselection from 3G to 2G only when the UE leave 3G coverage.
b.UE will trigger cell reselection from 2G to 3G once it go back to 3G
coverage.
2G Coverage
3G/2G Coverage
①
②

Idle Mode
• Strategy: More subscribers stay in DCS in Idle mode
Layer Priority: ID=OD>MD>MG
GSM1800 GSM1800GSM1800
GSM900
Cell
Micro Cell
Layer 3
Layer 2
GSM 900 GSM 900 GSM 900
GSM1800
GSM1800 GSM1800
GSM1800
GSM1800
Cell
Layer 1
In-Building Cell

• Parameter suggested
PARAMETER PROPOSED VALUES
Abbreviated Name Parameter Name MG MD ID OD
MAX TA(bit period(1 bit=0.55km))
Actual distance between MS &
BTS
62 33
2
Repeater site
value TBD
4
Repeater site
value TBD
RXLEV_ACCESS_MIN RxLevel Acces Min
Rural,5
Suburban 5
Others 8
(follow existing
value)
15
(follow
existing value)
15
(follow existing
value)
20
Radio Link Timeout (FR & EFR) RLT 32 28 36 28
Radio Link Timeout (AMR FR) AFRDSBLCNT 48 48 48 48
Layer of the Cell Layer of the Cell 3 2 1 1
Cell Priority Cell Priority 1 1 1 1
CRO Cell Reselection Offset 0 (0dB) 12 (24dB) 18(36dB) 15 (30dB)
TO Temporary Offset 0 (0dB) 0 (0dB) 4 (40dB) 4 (40dB)
PT Penalty Time 0 (20 second) 0 (20 second) 1 (40 second) 0 (20 second)
CRH Cell Reselection Hysteresis 14 dB 14 dB 14 dB 14 dB
BS_AG_BLKS_RES
Number of CCCH blocks reserved
for the AGCH
1 1 1 1
BS-PA-MFRAMS
Number of multi-frames in a cycle
on the paging channel
2 Multiframe
Period
2 Multiframe
Period
2 Multiframe
Period
2 Multiframe
Period
FMSMAXOPCC MS_TXPWR_MAX_CCH 5 0 0 0
Idle Mode & Call Control

Handover
• Huawei handover algorithm introduction
Emergency HO
MS Goes into New
Dedicated Mode
MS Goes into
Dedicated Mode
Measurement Report
processing1
Handover Judgment2
Handover Implementation
if necessary
3
TA HO
Interference HO
Bad Quality HO
Load HO
Edge HO
Layer HO
PBGT HO
AMR HO
No DL MR HO
Penalty Processing
Ranking Processing
Normal HO

Handover
Triggering
P/N
Serving Cell Neighboring
Cell
P: Watch Time (s)(s)
N: Valid Time (s)
RX_LEV Thr
Time
RX_Lev
• Edge Handover
UL/DL Edge HO is triggered when:
Serving cell: Rxlev < Edge HO Threshold following P/N rules
Neighboring cells following P/N rules with:
16 bits values lower than serving cell
DL_Rx_Lev(n)> DL_Rx_Lev(s)+[Inter-cell HO Hysteresis](s->n)
Candidate cell exists and available
Handover

• Layer Handover
Layer HO is triggered when:
Neighboring cells following P/N rules with:
16 bits values lower than serving cell
RX_LEV (n)>= [Inter-layer HO threshold] (n) + [Inter-layer HO hysteresis] (s->n)
Layer & level (n)<Layer & level (s)
Handover

• PBGT Handover
Serving Cell Neighboring Cell
Handover
Triggering
PBGT
HO
Threshold
Time
Path Loss
(dB)
126dB 119dB
5
126-
119=7dB>5dB
P/N
P: Watch
Time
N: Valid
Time
PBGT HO is triggered when:
Path loss (s) – Path loss (n) > PBGT HO Margin (s->n) and 16bits(n) < 16bits (s) following P/N
rules
Layer & level (n) = Layer & level (s)
Handover

PARAMETER PROPOSED VALUES
Abbreviated Name Parameter Name MG MD ID OD
Edge HO UL RX_LEV Threshold Edge HO uplink RX Level threshold -98 dBm -94 dBm -94 dBm -94 dBm
Edge HO DL RX_LEV Threshold Edge HO downlink RX Level threshold -94 dBm -90 dBm -90 dBm -90 dBm
Inter-layer HO Threshold Inter-layer HO Threshold -75 dBm -85 dBm -85 dBm -85 dBm
Inter-layer HO Hysteresis Inter-layer HO Hysteresis 2dB 2dB 2dB 2dB
PBGTMARGIN PBGT HO Margin 68 68 68 68
DLQUALIMIT DL Qual. Threshold 60 60 60 60
ULQUALIMIT UL Qual. Threshold 55 55 55 55
TALIMIT TA Threshold 62 33 2 4
Handover

 Cell Reselection Flow(2G->3G)
StartStart
Inter-RAT Cell Reselection Enable=YesInter-RAT Cell Reselection Enable=Yes
Ec/No>FDD_Qmin &last more than 5sEc/No>FDD_Qmin &last more than 5s
1 .RSCP > RLA_C+ FDD_Q_offset
2. Ec/NO > FDD_Q_min – FDD_Qmin_Offset
3. RSCP > FDD_RSCP_MIN
Above conditions are met for five consecutive
seconds
1 .RSCP > RLA_C+ FDD_Q_offset
2. Ec/NO > FDD_Q_min – FDD_Qmin_Offset
3. RSCP > FDD_RSCP_MIN
Above conditions are met for five consecutive
seconds
RLA_C>level threshold for searching 3G cellRLA_C>level threshold for searching 3G cell
EndEnd

PARAMETER
PROPOSED VALUES
Abbreviated Name Parameter Name
INTERRATOUTBSCHOEN Inter-RAT Out BSC Handover Enable No
INTERRATCELLRESELEN Inter-RAT Cell Reselection Enable Yes
INTERRATINBSCHOEN Inter-RAT In BSC Handover Enable Yes
CELLSELECTAFTERCALLREL Select 3G Cell After Call Release Yes
FDDQOFF FDD Q Offset 0 (always select a cell if
acceptable)
FDDQMIN FDD Qmin 7 (-12 dB)
FDDQMINOFFSET FDD Qmin Offset 0 (0 dB)
FDDRSCPMIN FDD RSCP Min. -102 dBm
QI Qsearch I 7 (always)
QP QsearchP 7 (always)
QCI Qsearch C Initial Use_Qsearch_I
QSEARCHC Qsearch C 7 (always)

•2G to 3G handover only activate in some spots
PARAMETER
PROPOSED VALUES
Abbreviated Name Parameter Name
INTERRATOUTBSCHOEN Inter-RAT Out BSC Handover Enable Yes
BET3GHOEN Better 3G Cell HO Allowed Yes
HOOPTSEL Inter-rat Ho Preference Pre_3G_Cell
HOPRETH2G HO Preference Threshold for 2G Cell -85 dBm
HORSCPTH3G RSCP Threshold for Better 3G Cell HO -75 dBm
HOECNOTH3G Ec/no Threshold for Better 3g Cell HO -7 dB
MINRSCPTHRES Min RSCP threshold -90 dBm
MINECNOTHRES Min Ec/No threshold - 9.5 dB
HOSTAT3G 3G Better Cell HO Watch Time 5 seconds
HODURT3G 3G Better Cell HO Valid Time 4 seconds
QCI Qsearch C Initial Use_Qsearch_I
QSEARCHC Qsearch C 7 (always)
FDDREP FDD REP QUANT
Dense Urban & Urban:
Ec/No
Suburban & Rural:
RSCP

PowerControl
• Huawei III Power Control
step1(k)= -1* (SF1*(ca_filtered(k)-STarget)+QF1*( qa_filtered(k)-QTarget))
step2(k)= -1* (SF2*(ca_filtered(k)- STarget)+QF2*( qa_filtered(k)-QTarget))
step(k)=max(step1(k) ， step2(k) )
SF1: Rx Level Adjust Factor
QF1: Rx Qual Adjust Factor
SF2: Rx Level Protect Factor
QF2: Rx Qual Protect Factor
STarget =(SThrUp+ SThrDown)/2
QTarget =(QThrUp+ QThrDown)/2
Step Calculation:

PowerControl
Parameter Name (UL)
PROPOSED
VALUES
Parameter Name (DL)
PROPOSED
VALUES
ULRexLevHighThred 18 (Rxlev > -92dBm) DLRexLevHighThred 25 (Rxlev > -85dBm)
ULRexLevLowThred 18 (Rxlev < -92dBm) DLRexLevLowthred 25 (Rxlev < -85dBm)
ULFSRexQualHighThred 16 (C/I >16dB) DLFSRexQualHighThred 16 (C/I >16dB)
ULFSRexQualLowThred 16 (C/I <16dB) DLFSRexQualLowThred 16 (C/I <16dB)
ULHSRexQualHighThred 18 (C/I >18dB) DLHSRexQualHighThred 18 (C/I >18dB)
ULHSRexQualLowThred 18 (C/I <18dB) DLHSRexQualLowThred 18 (C/I <18dB)
ULAFSRexQualHighThred 14 (C/I >14dB) DLAFSRexQualHighThred 14 (C/I >14dB)
ULAFSRexQualLowThred 14 (C/I <14dB) DLAFSRexQualLowThred 14 (C/I <14dB)
ULAHSRexQualHighThred 16 (C/I >16dB) DLAHSRexQualHighThred 16 (C/I >16dB)
ULAHSRexQualLowThred 16 (C/I <16dB) DLAHSRexQualLowThred 16 (C/I <16dB)
ULMAXDOWNSTEP 6 dB DLMAXDOWNSTEP 4 dB
ULMAXUPSTEP 8 dB DLMAXUPSTEP 8 dB
ULREXLEVADJFCTR 3 DLREXLEVADJFCTR 3
ULREXQUALADJFCTR 4 DLREXQUALADJFCTR 4
DLRXLEVPROTECTFACTOR 10 ULRXLEVPROTECTFACTOR 10
DLRXQUALPROTECTFACTOR 60 ULRXQUALPROTECTFACTOR 60

Huawei Parameter Strategy Guide for Traffic Balancing

Recommended

Recommended

More Related Content

What's hot

What's hot (20)

Viewers also liked

Viewers also liked (16)

Similar to Huawei Parameter Strategy Guide for Traffic Balancing

Similar to Huawei Parameter Strategy Guide for Traffic Balancing (20)

More from Ketut Widya

More from Ketut Widya (15)

Recently uploaded

Recently uploaded (20)

Huawei Parameter Strategy Guide for Traffic Balancing