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Recommended solutions for Traffic Balancing
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
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
Set proper cell selection and reselection parameters
Utilize proper cell layer settings and other handover parameters
Control idle mode MS behavior, optimize handover settings to achieve proper traffic load sharing
other
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Hierarchical strategy for GSM900 and GSM1800
The layer of GSM 1800 cell is higher than the layer of GSM 900 cell.
In idle mode, the MS stay in the GSM 900 cell B by setting the cell selecting or cell reselecting parameters.
When the DL signal level is good enough to reach the threshold, the MS is triggered the Layer HO to GSM 1800 cell B.
-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.
-2 In oder to avoiding congestion of GSM 1800 cell, the Load HO can be used to share some traffic to GSM 900 cell.
Traffic Share Solution
Edge HO/Load HO
The MS in this zone are difficult to be triggered handover from GSM 1800 cell to GSM 900 cell.
Cell B
GSM 900
Edge HO Threshold
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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.
Only suggest to active the cell reselection from 2G to 3G.
Both cell reselection and handover are suggested from 3G to 2G.
Cell reselection from 3G to 2G only when the UE leave 3G coverage.
UE will trigger cell reselection from 2G to 3G once it go back to 3G coverage.
Traffic Share Solution
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Layer Priority: ID=OD>MD>MG
In-Building Cell
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62
33
RXLEV_ACCESS_MIN
15 (follow existing value)
15 (follow existing value)
RLT
32
28
36
28
AFRDSBLCNT
48
48
48
48
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
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Handover
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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
Handover
Triggering
P/N
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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)
Candidate cell exists and available
Handover
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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)
Candidate cell exists and available
Handover
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Edge HO uplink RX Level threshold
-98 dBm
-94 dBm
-94 dBm
-94 dBm
Edge HO downlink RX Level threshold
-94 dBm
-90 dBm
-90 dBm
-90 dBm
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Ec/No>FDD_Qmin &last more than 5s
1 .RSCP > RLA_C+ FDD_Q_offset
2. Ec/NO > FDD_Q_min – FDD_Qmin_Offset
RLA_C>level threshold for searching 3G cell
End
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No
INTERRATCELLRESELEN
Yes
CELLSELECTAFTERCALLREL
Yes
FDDQOFF
FDDQMIN
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2G/3G Interoperability
Yes
BET3GHOEN
Yes
HOOPTSEL
-85 dBm
-75 dBm
-7 dB
5 seconds
4 seconds
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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
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