10 rn2010aen14gln0 multi-bcf cbcch
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Multi-BCF and Common CBCCH
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BSSPAR1: Chapter 10Multi-BCF and Common BCCH
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Module Objectives
Give an overview of the common BCCH and Multi BCF feature
Explain the concept of segments and associated Common BCCHparameters
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Dual Band Operation Every BTS has its BCCH and SDCCH channels
Common BCCH Control Improved spectral efficiency (one BCCH)
Optimised use of signalling channels
Tighter reuse of non BCCH carriers
Better quality (decreased number of HOs)
Non BCCH freq. BTS
BCCH/SDCCH
BCCH freq. BTS
Cell 2
BCCH/SDCCH
Cell 1
BCCH/SDCCH
Common BCCH
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Allows integration of TRXs from different frequency bands into onecell (segment)
Provides service to MSs in all frequency bands which they support Improved spectral efficiency: different bands of a cell share the same
BCCH
BCCH is allowed in any of the supported frequency bands Improved trunking gain
Base stations: Talk Family, Ultra, Flexi and Metrosite
Common BCCH
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BCCH Allocation mainly similar to the single band networkimplementation
Adjacency information sent to the mobile station is based on theBCCH frequency of a common BCCH segment
Other frequency layers in a segment are invisible to the mobilestations
MS sees a segment as one BCCH frequency cell
MS sees many segments as a BCCH frequency network
Modified BA list to an MS on the non BCCH frequency layer of asegment
the BCCH frequency of the segment itself is added among the BCCH
frequencies the MS measures
Common BCCH
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Initial SDCCH on the BCCH carrier band
the multiband capabilities of an accessing mobile station are notknown at the time of the initial SDCCH allocation
no way to define the usability of the non-BCCH layer of the segmentbecause the MS starts sending measurement reports only after it hasmoved to a dedicated channel
While the MS is on an SDCCH the BSC receives
in Classmark Change message Mobile Station Classmark 3 indicatingthe terminal's frequency capability of using other frequency bandsthan BCCH frequency band
SDCCH allocation in CBCCH
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1. SYS INFO-1 (BCCH)- CA list of BCCH frequency band
2. IMMEDIATE ASSIGNMENT COMMAND(AGCH)- MA list of BCCH frequency band (if FH)
Initial SDCCH allocation always from BCCH frequency band
Non BCCH freq. layer
BCCH freq. layer
SDCCHSDCCH
Common BCCHInitial SDCCH allocation
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Segment and BTS objects
Segment
Segment = Telecom cell A segment may consist of severalBTS objects. BTSs of a segment are co-locatedand synchronised. The maximum number of BTSs in asegment is 32. The maximum number of TRXs in asegment is 36.
BTS object in a segment must consist
of TRXs of the same frequency bandand base station type
This is an example only. Itis also possible to have
EGSM and PGSMresources in the same BTS
object.
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Allows combination of several BTSs into one logical cell
BSC supports Multi BCF Control for Talk family, UltraSite, Flexi and MetroSitebase stations (specific BTS combinations)
Allows the operator to increase the capacity of a cell to 24 TRX (Metro, TalkFamily) or to 36 TRXs (Ultra, Flexi)while maintaining the maximum spectralefficiency (no extra BCCH)
Site expansion path from Talk Family to UltraSite/Metrosite (thus providingEDGE support to the site)
In the case of MetroSite the BSC allows only MetroSite base stations in a multiBCF segment
When Multi BCF Control and Common BCCH are combined you are allowed toconfigure both BTSs of different frequency bands and BTSs of different basestation types to one segment.
Multi BCF
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BTS-1, BCCH-1
- BB hopping- 6 TRXsBTS-5, BCCH-5
- RF hopping- 6 freq, f1-f6- 2 TRXs
BTS-3, BCCH-3
- BB hopping- 6 TRXsBTS-4, BCCH-4
- RF hopping- 6 freq, f1-f6- 2 TRXs BTS-2, BCCH-2
- BB hopping- 6 TRXsBTS-6, BCCH-6
- RF hopping- 6 freq, f1-f6- 2 TRXs
BTS-1, BCCH-1
- BB hopping- 6 TRXsBTS-5
- RF hopping
- 6 freq, f1-f6- 2 TRXs
BTS-3, BCCH-3
- BB hopping- 6 TRXsBTS-4
- RF hopping- 6 freq, f1-f6- 2 TRXs BTS-2, BCCH-2
- BB hopping- 6 TRXsBTS-6
- RF hopping- 6 freq, f1-f6- 2 TRXs
UltraSite 8+8+8 configurationwith separate BCCH (DualBCCH)
altogether 6 BCCH carriers
UltraSite 8+8+8 configurationwith Multi BCF
improved spectral efficiency, 3BCCH carriers
Multi BCF, example
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GSM 1800
GSM 900
BCCHBTS1
BTS2
GSM 1800
GSM 900
BCCHBTS1
BTS2
bsTxPwrMax = peak power 0 dB
bsTxPwrMax1x00 = peak power 0 dB
GSM 900 signal tends to be stronger than GSM 1800
-> wider coverage for GSM than for GSM 1800-> useless if BCCH is taken from GSM 1800
Band specific maximum output power of BTS
bsTxPwrMax used for GSM 800/900bsTxPwrMax1x00 used for GSM 1800/1900
bsTxPwrMax = peak power 6 dB
bsTxPwrMax1x00 = peak power 0 dB
Common BCCHBand Specific Power Control
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Common BCCH
TXP230 dBmThe maximum transmission power an MS may use
when accessing a CCH in the cell for GSM
1800/1900 bands.
Range:
GSM 1800: 0..36 dBm (step size 2)
GSM 1900: 0..32 dBm (step size 2) and 33 dBm
0...36 dBm, step 2 dBmmsTxPwrMaxCCH
1x00
BTS
TXP133 dBmThe maximum transmission power an MS may use
when accessing a CCH in the cell for GSM 900/800
bands.
5...39 dBm, step 2 dBmmsTxPwrMaxCCHBTS
BSC - MML
Name
Default
value
DescriptionRange And StepAbbreviated
Name
MO
Class
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Common BCCHAccess to non-BCCH layer
LAR-90 dBmThreshold value for the estimated downlink
signal level on non-BCCH layer for a
moving MS from BCCH layer to non-BCCH
layer.
-110...-47 dBm,
step 1 dBm
nonBcchLayerA
ccessThr
HOC
NBL0Defines whether the predefined offset
margin is used when evaluating the signal
level of the non BCCH layer.
-40...40, step 1nonBCCHLayer
Offset
BTS
BSC - MML
Name
Default
value
DescriptionRange And StepAbbreviated
Name
MO
Class
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MS indicates its capabilities while on an SDCCH
=> BSC finds out if non BCCH frequency band resources could be included inchannel allocation for the terminal
MS reports the downlink signal level on the SDCCH
=> BSC finds out if radio conditions are good enough for the MS to use nonBCCH frequency resources of the segment with the criterion
RXLEV_DL NonBcch LayerOf fset>= NonBCCHLayerAccessThreshold
Where: RXLEV_DL is last received signal strength on the serving channel
With the decisions above the BSC determines the applicable frequency bands ofa segment for an MS during call setup when the MS moves from an SDCCH to aTCH
Common BCCHCall Setup
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In BSC internal handovers between separate cells the usability of BCCH frequency handresources in a target cell is defined using the BTS specific offset parameter and aneighbour parameter defined for the target cell:
AV_RXLEVNCELL (n) >= rxLevMin Cell (n)
In BSC internal handovers between separate cells the usability of non BCCH frequencyband resources in a target cell is defined using the BTS specific offset parameter and a newthreshold parameter defined for the target cell:
AV_RXLEVNCELL (n) NonB cch LayerOffset (n)>=NonBCCHLayerAccessThreshold (n)
Applies to both SDCCH and TCH allocation cases
Common BCCHIntercell Handover
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When the call is going on on a non-BCCH frequency band the usability of differenttypes of resources is defined based on the averaged BCCH measurement results.The following formulas are used:
AV_BCCH_RXLEV_DL NonBcchLayerOffset >= rxLevAccessMin
AV_BCCH_RXLEV_DL NonBcchLayerOffset >= NonBCCHLayerAccessThreshold
The first formula is used to evaluate the usability of BCCH frequency resources of thesegment. The second formula is used to evaluate the usability of non-BCCH frequencyresources of the segment.
Common BCCHIntra cell handover
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In case of handover to a segment of another BSC, the non-BCCH layer of the segmentis usable if it is at least as strong as the BCCH layer.
The nonBCCHLayerOffset(n) on the target non-BCCH BTS must be equal to zero orless than zero for the BTS to be used for incoming handover
Applies to both TCH and SDCCH cases
Common BCCHExternal handover
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Common BCCHSDCCH Handover based on duration of reservation
Since the allocation of the initial SDCCH takes place in the band where the BCCH is, a method is defined totrigger SDCCH handovers to other band(s)
Based on the SDCCH reservation duration on the initial band
Guided by a parameter IntraSegSdc chHo Guard (ISS)
SDCCH reservation duration exceeds IntraSegSdcchHoGuard
There are resources outside the initial band in a cell and satisfy the following:
RXLEV_DL - non BCCH layer offset >= non BCCH layer access threshold
MS has the required support for the other resource types
ISS255 sguard time for attempting an
SDCCH handover from the
BCCH BTS resource layer to
another resource layer in a
segment.
0...255 s, step 1 s
0: no time limit set for starting an SDCCH
handover attempt from the BCCH BTS
resource layer, attempt can be made as
soon as possible1..254: time after which an SDCCH
handover from the BCCH BTS resource
layer is attempted
255: no SDCCH handover from the BCCH
BTS resource layer is attempted based on
SDCCH reservation duration
intraSegSdcchHoG
uard
BSC
BSC - MML
Name
Default
value
DescriptionRange And StepAbbreviated
Name
MO
Class
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BSC initiates an intra cell handover when TCH load in a some BTS of the
segment reaches a level defined with the BTS level parameterBTSLoadInSEG.
Triggering level = BTSLoadInSEG +((100 - BTSLoadInSEG )/2)
BSC checks the load of the BTSs every time it receives a TCH request for thesegment
BSC accepts as target only the segment's BTSs whose load is below the respective BTSLoadInSEG value
in which the radio conditions are good enough
which are not same resource type as the source BTS and the BCCH BTS
The handover is primarily used to move TCH load from the BCCH resourcetype but handovers can also be made between other resource types
Common BCCH & Multi BCFHandover for balancing load
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Common BCCH & Multi BCFBTS Load in SEG
LSEG70%Determines the load limit for a BTS.
It is used in controlling the load distribution
between BTSs in a segment.
0...100 %, step 1 %btsLoadInSegBTS
BSC - MMLName
Defaultvalue
DescriptionRange And StepAbbreviatedName
MOClass
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Common BCCHIntra cell handover from non BCCH layer based on signal level
BSC initiates an intra cell handover from non BCCH layer to BCCH layer when the averageddownlink signal level on serving channel decreases below the threshold defined by
parameter NonB cch LayerExitTh resho ld (LER, Nx, Px) This decreases the number of inter cell handovers from non BCCH layer
Handover is applicable in cells where BCCH layer has more coverage than non BCCH layer
BSC uses general Power Control and Handover Algorithm functions to trigger the handover
If intra cell handover fails then inter cell handover can be triggered
LER-95 dBmWith this parameter you define a threshold value
for the measured downlink signal level on non-
BCCH layer for a moving MS from non-BCCH layer
to BCCH layer
-110...-47 dBm, step 1
dBm
rxLevelHOC
LEP1Px value for the above threshold1...32, step 1nonBcchLayerExit
Thr_px
HOC
LEN1Nx value for the above threshold1...32, step 1nonBcchLayerExit
Thr_nx
HOC
BSC - MML
Name
Default
value
DescriptionRange And StepAbbreviated
Name
MO
Class