tmd b9pres 11oct05 cs aspect ed02
TRANSCRIPT
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All rights reserved 2005, Alcatel
B9 Parameter WorkshopPart 1: Circuit Switched (CS) Aspects
Presentation to T-Mobile, Bonn, 11 Oct 2005
Alcatel-PCS
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Agenda
B9 features and related parameters:
Enhanced E-GSM band handling
Electromagnetic environment (EME) supervision
Radio Measurement Statistics (RMS) improvements
Voice Group Call Services (VGCS)
Features influencing the B9 channel allocation strategy forCS calls:
Enhanced E-GSM band handling
Voice Group Call Services (VGCS)
Intracell HO cause 30
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Enhanced E-GSM band handlingIntroduction (1/2)
Feature goals in B9: full support of the (E)GPRS service on the E-GSM TRXs of an E-GSM cell
signaling in G1 band
Limitations in B7.2 and B8: (E)GPRS service is not supported on G1 TRXs;
Signaling is not supported on G1 TRXs;
Only one GPRS MA;
The frequency hopping shall be applied only to a set of G1 frequencies or toa set of P-GSM frequencies.
Band ARFCNUplink Freq.
(MHz)Downlink Freq.
(MHz)
P-GSM 1 .. 124 890.2 to 915.0 935.2 to 960.0
G1-GSM 975 .. 1023, 0 880.2 to 890.0 925.2 to 935.0
G1-GSM
band
E-GSM uplink
E-GSM downlink
P-GSM band
G1-GSM
bandP-GSM band
880 890 915
935925 960
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Enhanced E-GSM band handlingIntroduction (2/2)
Characteristics of E-GSM in B9:The (E)GPRS service is supported, without any constraint, on E-GSM
TRXs;
Mixing frequencies of P-GSM band and G1 band in the same FHS issupported.
For Business cases 2, 3: all types of signaling channels (BCCH,CCCH, MPDCH, etc) are supported, without any constraint, on E-GSM TRXs;
For Business cases 1 only: the radio resource allocation strategyapplied for P-GSM capable only MSs is different than that applied forE-GSM capable MSs
Expected gains in B9Additional network capacityDecrease of the interference level in the P-GSM band by unloading
the P-GSM TRXs
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Enhanced E-GSM band handlingMarket View
Business Case 1: P-GSM network extension with the frequencies inG1 band
The operator has mainly the frequency in the P-GSM band. Some frequencies in G1
band are added to the cells for capacity extension purpose.
In this Business Case, the old Phase 1 MS may still be in use in the network.
In this presentation the Phase 1 MS is named as P-GSM capable only MS.
Business Case 2: DCS 1800 network extension with the frequencies in
E-GSM band (without frequencies in the P-GSM band)
In this Business Case, all MSs used are at least Phase 2 MSs, as a consequence, they
can decode G1 frequencies.
Business Case 3: : Full G1 network (without any frequency in the P-GSM band) or network with mainly the frequencies in G1 band
In this Business Case, all MSs used are at least Phase 2 MSs, as a consequence, they
can decode G1 frequencies.
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Enhanced E-GSM band handlingFunctional description (1/3)
The Enhanced E-GSM band handling" feature can work intwo different modes :
Mode 1 : P-GSM capable only MSs are not supported
The mode 1 covers the Business Case 2 and 3.
The allocation algorithm is linked to EGSM_RR_ALLOC_STRATEGY parameter set to
Same behaviour for E-GSM capable MS (1)
Mode 2 : P-GSM capable only MS are supported
The mode 2 covers the Business Case 1.
The allocation algorithm is linked to EGSM_RR_ALLOC_STRATEGY parameter setto Different behaviour for E-GSM capable MS (0)
The parameterEGSM_RR_ALLOC_STRATEGY is notmodifiable at the OMC-R : to be set in the BSC CDE Table
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Enhanced E-GSM band handlingFunctional description (2/3)
Mode 1: Support of E-GSM networks With this mode :
the E-GSM TRX is defined as follow:
frequencies in P-GSM band only
or frequencies in G1 band only
or mixing frequencies in P-GSM band and G1 band.
The (E)GPRS service is supported, without any constraint, on E-GSM TRXs.
All types of signaling channels (BCCH, CCCH, MPDCH, ) are supported, without any constraint,on E-GSM TRXs.
Resource allocation strategy:
As the P-GSM capable only MS is not supported, there is not specific radio resource allocation
strategy in the E-GSM cell. In particular, P-GSM capable only MS is not ensured to be allocated with P-GSM resources
G1 P-GSM
E-GSM
880 890 915
925 935 960
G1 P-GSM
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Enhanced E-GSM band handlingFunctional description (3/3)
Mode 2: Support ofP-GSM only MS in E-GSM networks
The main characteristics of this mode is as follows :
The radio resource allocation strategy applied forP-GSM capable only MSs is
different than that applied forE-GSM capable MSs.
From the radio resource allocation point of view, the meaning of E-GSM TRX is
changed. An E-GSM TRX is re-defined as follow:
frequencies in G1 band only
or mixing frequencies in P-GSM band and G1 band.
BCCH, CCCH, SDCCH and CBCH cannot be defined on E-GSM TRX
E-GPRS services can be supported on E-GSM TRX
The new radio resource allocation strategy is based on the hypotheses that all
GSM900 (E)GPRS MSs are assumed E-GSM capable and compliant to Phase 2 of
3GPP standard.
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Enhanced E-GSM band handlingOMC-R parameters (1/2)
HMI name Definition Sub-system
Instance
OMC-Raccess
Type Defvalue
Range Unit
EGSM_RR_ALLOC_STRATEGY
Defines the radio resourceallocation strategy used in E-GSM cells.
0: Different behavior for E-GSMcapable MS: The BSS handlesdifferently E-GSM capable MS fromP-GSM only capable MS in E-GSMcells.
1: Same behavior forE-GSM
capable MS: The BSS handles inthe same way only P-GSM capableMS as E-GSM capable MS in E-GSM cells,
BSC BSS Displayed Number 0 [0,1] None
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Enhanced E-GSM band handlingOMC-R parameters (2/2)
HMI name Definition Sub-system
Instance
OMC-Raccess
Type Defvalue
Range Unit
FREQUENCY_RANGE This parameter indicates thefrequency range of the cell.
0: PGSM (GSM 900),
1: DCS 1800,
2: EGSM,
3: DCS 1900,
4: PGSM-DCS1800,
5: EGSM-DCS1800,
6: GSM 850
BSC cell Changeable
Number 0 [0,6] None
PLMN_FREQUENCY_BANDS (BSC)
Frequency bands used inthe whole PLMN.
BSC BSS Virtualchangeable
Number 0 [0,3] None
PLMN_FREQUENCY_BANDS (MFS)
Frequency bands used inthe whole PLMN.
MFS BSS Virtualchangeable
Number 0 [0,3] None
HMI name Definition Sub-
system
Insta
nce
OMC-R
access
Type Def
value
Range Unit
EN_LOAD_EGSM Allows to take into account TCHresources of G1 TRXs for loadevaluation. When enabled, thevalues of the parametersFREElevel_1 to FREElevel_4need to be updated to numberof TRX considered in the loadcomputation.
BSC BSC changeable Flag 1 [0,1] None
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Agenda
B9 features and related parameters:
Enhanced E-GSM band handling
Electromagnetic environment (EME) supervision
Radio Measurement Statistics (RMS) improvementsVoice Group Call Services (VGCS)
Features influencing the B9 channel allocation strategy forCS calls:
Enhanced E-GSM band handling
Voice Group Call Services (VGCS)
Intracell HO cause 30
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EME supervisionIntroduction (1/3)
Feature goals in B9:
detect situations where the emitted power is exceeding the maximumvalue pre-defined at commissioning per cell and per frequency band
record over time the average power emitted at the BTS antenna output
connector per cell and per frequency band (i.e. power evolution overtime for each cell and per band)
with the help of appropriate tools (e.g. A956 RNO) to:
provide warning report on the delta power between the average emittedpower per cell and per band (EME_PWR_GSM resp. EME_PWR_DCS) and apredefined threshold (EME_PWR_MAX_GSM resp. EME_PWR_MAX_DCS)
display evolution of EME_PWR_GSM and EME_PWR_DCS
display the absolute BCCH power at the BTS antenna output connector
provide statistics and tendencies on the emitted power for each cell (perband).
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EME supervisionIntroduction (2/3)
Limitations in B8:
no information on the emitted power of the cell
Expected gains in B9:
secure the application of regulatory requirements
anticipate situations that may imply a revision of the accessrestrictions
collect raw data on the actual levels of emitted power
collect more accurate values at the BTS level taking into accountpower control and DTX
support dialogue with neighborhood and local authorities on sensitivesites with daily statistics
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EME supervisionIntroduction (3/3)
EME i i
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EME supervisionFunctional description (1/4)
Characteristics of EME supervision feature in B9:
1.) new BSS PM type is defined for EME: Type 33
restriction in the PMC configuration (for the EME type only) :
start-time value is forced to 00:00 and stop-time value is forced to 24:00 (interm of OMC local time)
accumulation period is blocked to 1 hour
Storage of hourly indicators: during 1 month
Storage of daily maximum power indicators: during 13 months
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EME supervisionFunctional description (2/4)
2.) PM33 type data collection (description)
The mechanism is permanent in EVOLIUM TRE and between BSC/TCU andEVOLIUM BTS/TRE; it involves all EVOLIUM TREs and all TCUs connected to1 or more EVOLIUM TREs:
every EVOLIUM TRE collects DL power data
every TCU sends every 15 minutes (and in the same time) the messageEME_DATA_REQ to all EVOLIUM TRE connected to it.
after sending EME_DATA_REQ to a TRE, BSC/TCU starts a wait timer(EME_DATA_TIMER) to wait the EME_DATA_IND from this TRE.
after reception of the message EME_DATA_REQ, each EVOLIUM TRE resetscounters, prepares statistics and sends EME counters to the related TCU inthe message EME_DATA_IND.
if no EME_DATA_IND received from a given TRE by TCU before time out, the h counter value will be set to invalid.
if EME_DATA_IND is delayed i.e. received by BSC after time out, the countervalue is discarded by the BSC
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EME supervisionFunctional description (3/4)
2.) continued: PM33 type data collection (visualisation of EMEmessage flow between BSC and BTS)
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EME supervisionFunctional description (4/4)
3.) Calculation of TRX average power at the antenna connector (ANoutput) takes into account:
Static power contribution:
TRE maximum power
power leveling
loss due to stages (ANy, AN) and cables between TRE output and BTSantenna output connector
BS_TXPWR_MAX
Dynamic power contribution: Power control
No power
contribution: DTX
unused timeslots
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EME supervisionOMC-R parameters
HMI name Definition Sub-system
Instance
OMC-Raccess
Type Defvalue
Range Unit
EME_PWR_MAX_
GSM
= operationalparameters (no impacton the telecom part, buton O&M).
This threshold is themaximum power level than aBTS (cell) is permitted toemit at the BTS antennaoutput connector on theGSM bands (850 MHz and900 MHz). It is set accordingto the size of thecompliance boundary, i.e.the wider the complianceboundary, the higher thethreshold value can be.If thepower level exceeds thisthreshold, then there is somechance that the referencelevels are no morerespected beyond thecompliance boundary.
OMC cell changeable Threshold
9999 [1,9999]
None
EME_PWR_MAX_DCS
Same definition as abovebut for DCS bands(1800MHz and 1900MHz)
OMC cell changeable Threshold 9999 [1,9999] None
EME_DATA_TIMER Supervision timer for thereception of theEME_DATA_IND messageby the BSC
BSC BSC changeable timer 6 [0,255]
sec
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Agenda
B9 features and related parameters:
Enhanced E-GSM band handling
Electromagnetic environment (EME) supervision
Radio Measurement Statistics (RMS) improvementsVoice Group Call Services (VGCS)
Features influencing the B9 channel allocation strategy forCS calls:
Enhanced E-GSM band handlingVoice Group Call Services (VGCS)
Intracell HO cause 30
RMS i t
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RMS improvementsIntroduction (1/2)
The B9 feature RMS improvements is composed of 3 sub-features.
Feature goals in B9:RMS improvements on AMR statistics (sub-feature RMS_I1, split into
the sub-features RMS_I12 and RMS_I13):providing measurement of AMR codec usage in RMS, for optimisation ofspeech quality through AMR
RMS improvements on TA statistics (sub-feature RMS_I2):providing statistic on RMS Timing advance, for optimisation of NWplanning, through identification of resurgences and hot spots
RMS improvements on TRX power statistics (sub-feature RFD55/138315 RMS indicators storage enhancement):providing the maximum GMSK power used by each TRE at BTSantenna connector
RMS i t
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RMS improvementsIntroduction (2/2)
Limitations in B8, B7.2:RMS on AMR (sub-feature RMS_I1): not supported in B7.2/B8
RMS on TA (sub-feature RMS_I2): only measurement reportstrespassing a TA threshold are available (counter name
PERC_TA_GT_TA_STAT), along with the max. measured TA (countername MAX_TA)
RMS on TRX power: not supported in B7.2/B8
Expected gains in B9:monitoring the proper operation of AMR and the voice quality in a cell
=> help tuning the AMR parameters (definition of the codec subset,thresholds and hysteresis)
monitoring the quality of the radio coverage and the geographical trafficdistribution in a cell (identifying hot spot and resurgences/interferencespots)
knowing the exact GMSK power of each TRE
RMS improvements
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RMS improvementsFunctional description (1/4)
General process for RMS (reminder): The BTS collects the RMS measurement results, formats them into
matrixes or vectors, and sends them to the BSC. The BSC forwards themto the OMC using the usual PM mechanism
Characteristics ofRMS improvements
feature in B9:
1.) RMS improvements on AMR statistics (sub-feature RMS_I1)
1.1) RMS_I12: Bad Frame Indication per AMR codec in UL
First, following 2 vectors are filled by each TRE of the BTS:
AMR FR UL BFI vector (TRX based)
AMR HR UL BFI vector (TRX based)
Next, for each vector listed above, there are 2 counters filled for RMSmeasurement reporting:
one counter contains the coded measurement values
the other counter contains the maximum value of all measurement values inthe vector
RMS improvements
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RMS improvementsFunctional description (2/4)
1.2) RMS_I13: AMR codec usage compared to RXLEV
First, following 4 matrices are filled by each TRE of the BTS:
AMR FR UL usage / UL_RXLEV (TRX based)
AMR HR UL usage / UL_RXLEV (TRX based)
AMR FR DL usage / DL_RXLEV (TRX based)AMR HR DL usage / DL_RXLEV (TRX based)
Next, for each matrix listed above, there are 2 counters filled for RMSmeasurement reporting:
one counter contains the coded measurement values,
the other counter is a vector which contains the maximum values in
each matrix row
RMS improvements
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RMS improvementsFunctional description (3/4)
2.) RMS improvements on TA statistics (sub-feature RMS_I2)
There are 3 groups of RMS improvements on TA statistics:
2.1)Timing advance distribution (TRX based)
2 counters are filled (TRX based):
one counter contains the coded measurement values for Timing advance
distribution per TA band the other counter contains the maximum value of all measurement value
2.2)Average Rxlev per TA band
2 counters are filled:
one with the coded measurement values for UL average Rxlev per TA band
the other with the coded measurement values for DL average Rxlev per TA band
2.3)Average Rxqual per TA band
2 counters are filled:
one with the coded measurement values for UL average Rxqual per TA band
the other with the coded measurement values for DL average Rxqual per TAband
RMS improvements
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RMS improvementsFunctional description (4/4)
3.) RMS improvements on TRX power statistics
One new counter (RMSpw3, TRX based) is defined, to get the maximumGMSK TRX power level applied at the BTS antenna output connector indBm.
The power takes into account the different BTS internal losses (cables,internal combiners) and the internal/ external leveling but it does not takeinto account the BS_TXPWR_MAX, attenuation required by the OMC_R.
RMS improvements
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RMS improvementsOMC-R parameters (1/2)
There are no new B9 parameters related to the sub-features:
RMS improvements on AMR statistics (sub-features RMS_I12 andRMS_I13)
RMS improvements on TRX power statistics
There are new B9 parameters related to the sub-feature:
RMS improvements on TA statistics (sub-feature RMS_I2)
RMS improvements
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RMS improvementsOMC-R parameters (2/2)
HMI name Definition Sub-
system
Insta
nce
OMC-R
access
Type Def
value
Range Unit
MEAS_STAT_TA_1 Upper limit of the first TAband, lower limit of thesecond TA band (for theRMS TA measurements)
BSC BSS Changeable
number 7 [1, 62] bper
MEAS_STAT_TA_2 Upper limit of the 2nd TAband, lower limit of the 3rdTA band
BSC BSS Changeable
number 13 [1, 62] bper
MEAS_STAT_TA_3 BSC BSS Changeable
number 19 [1, 62] bper
MEAS_STAT_TA_4 BSC BSS Changeable
number 25 [1, 62] bper
MEAS_STAT_TA_5 BSC BSS Changeable
number 31 [1, 62] bper
MEAS_STAT_TA_6 BSC BSS Changeable
number 37 [1, 62] bper
MEAS_STAT_TA_7 BSC BSS Changeabl
e
number 43 [1, 62] bper
MEAS_STAT_TA_8 BSC BSS Changeable
number 49 [1, 62] bper
MEAS_STAT_TA_9 Upper limit of the 9th TAband, lower limit of the 10thTA band
BSC BSS Changeable
number 55 [1, 62] bper
RMS improvements
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RMS improvementsRMS indicators (1/2)
Ref. name Mnemonic Definition Formula
RMAMUFBV RMS_AMR_FR_UL_BAD Number of bad speech frames using any
AMR FR codec in uplink
RMS44
RMAMUHBV RMS_AMR_HR_UL_BAD Number of bad speech frames using anyAMR HR codec in uplink
RMS45
RMAMUFSM RMS_AMR_FR_UL_RXLEV_UL Number of speech frames using oneAMR FR codec in uplink per Rxlev on
the uplink path
RMS46
RMAMUHSM RMS_AMR_HR_UL_RXLEV_UL Number of speech frames using oneAMR HR codec in uplink per Rxlev on
the uplink path
RMS48
RMAMDFSM RMS_AMR_FR_DL_RXLEV_UL Number of speech frames using oneAMR FR codec in downlink per Rxlev on
the downlink path
RMS47
RMAMDHSM RMS_AMR_HR_DL_RXLEV_UL Number of speech frames using oneAMR HR codec in downlink per Rxlev on
the downlink path
RMS49
As standards RMS indicators they are not agregatedday/week/month. They all are defined at TRX level andagregated on cell only
RMS improvements
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RMS improvementsRMS indicators (2/2)
Ref. name Mnemonic Definition Formula
RMAXTAV RMS_RXLEVEL_TA_THRESHOLD
10 TA bands: 9 thresholds + min + max TAB_PAR_MEAS_STAT__TA + min + max
RMTADIV RMS_TPR_TIMING_ADVANCE The distribution of number ofmeasurement reports for which the valueof timing advance is in TA band
RMS50
RMTAULVV RMS_TPR_UL_RXLEV_TA_BAND
The average value of RXLEV per TAband in uplink.
RMS51
RMTADLVV RMS_TPR_DL_RXLEV_TA_BAND The average value of RXLEV per TAband in downlink. RMS52
RMTAUQUV RMS_TPR_UL_RXQUAL_TA_BAND
The average value of RXQUAL per TAband in uplink.
RMS53
RMTADQUV RMS_TPR_DL_RXQUAL_TA_BAND
The average value of RXQUAL per TAband in downlink
RMS54
RMTIBPWMN MAX_POWER_PER_TRX Maximum GMSK TRX power level
applied at the BTS antenna outputconnector in dBm.
The power takes into account thedifferent losses (cables, internalcombiners) and the internal/externalleveling but it does not take into accountthe BS-TXPWR-MAX, attenuationrequired by the OMC_R..
RMSPw3
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Agenda
B9 features and related parameters:
Enhanced E-GSM band handling
Electromagnetic environment (EME) supervision
Radio Measurement Statistics (RMS) improvementsVoice Group Call Services (VGCS)
Features influencing the B9 channel allocation strategy forCS calls:
Enhanced E-GSM band handling
Voice Group Call Services (VGCS)
Intracell HO cause 30
VGCS
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VGCSIntroduction (1/2) - ASCI overview
Advanced Speech Call Items (ASCI) are defined as additionalsupplementary services by GSM Phase 2+
ASCI features provide voice group and priority functionality
1.) Voice group services:
Voice Broadcast Service (VBS) - not implemented in B9
Typical trunked radio communication, point to multipoint, 1 speaker (MOC or MTC), manylistener.
Voice Group Call Services (VGCS) - implemented in B9 as a pure SW feature
Typical trunked radio communication, point to multipoint, several dispatcher (MOC or MTC),many listener, subsequent talker.
2.) enhanced Multi-Level Precedence and Pre-emption service (eMLPP): Precedence involves assigning a priority level to a call in combination with fast call set-up.
Pre-emption involves the seizing of resources, which are in use by a call of a lowerprecedence, by a higher level precedence call in the absence of idle resources. Pre-emption can also involve the disconnection of an on-going call of lower precedence toaccept an incoming call of higher precedence
VGCS
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VGCSIntroduction (2/2)- General concept of VGCS usage
BTS BSC
BTS
BSC
BTS
BTS BSC
Group callarea A
GMSC
Relay MSC
Distribution function
Anchor MSC
Conference bridge
Group callarea B
Group ID 1
Group ID 1
Group ID 1
Group ID 2
Group ID 2
External dispatchera
VGCS I:
Group call area A
Group ID 1
Dispatcher (external)a
One broadcast channel percell and per group call
One VGCH channel (TCH/SACCH/FACCH)may be allocated per cell and group calll
GCR
Group Call Register (GCR)
contains group call related data:
- Group ID
- Priority (network, subscriber)
- Call setup class (fast, normal)
Group ID 1
New calling subscriber (first period dedicated
channel)
VGCS
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VGCSOverview VGCS procedure involved O&M parameter
VGCS Procedure Name of involved new B9 parameters
Notification for mobile stations in idle mode NOTIF_PCH_THR
Notifications for mobile stations in GroupReceive Mode or (Dedicated) Group TransmitMode
EN_INBAND_NOTIF
NOTIF_FACCH_OTHER_VGCS_CALL_THR
Notifications for mobile stations in DedicatedMode
EN_INBAND_NOTIF
NOTIF_FACCH_PTP_CALL_THR
Paging into on-going VGCS call EN_INBAND_PAGING
INBAND_PAGING_THR
Notification Response Procedure T_NOTIF_RESPONSE_DELAY
Uplink Access Procedure T3115
NY2
Uplink Allocation Procedure (SubsequentTalker Procedure)
T_WAIT_UPLINK_REQUEST_ACK
Uplink Reply Procedure (listener detection) START_UPLINK_REPLY
T_REPETITION_UPLINK_FREE
T_WAIT_UPLINK_ACCESS
WAIT_UPLINK_ACCESS
The VGCS Call Termination Procedures(when VGCS call is released by the callingsubscriber)
T_REPETITION_CHANNEL_RELEASE
VGCS
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VGCSOMC-R parameters (1/6)
HMI name Definition Sub-
system
Insta
nce
OMC-R
access
Type Def
value
Range Unit
CS_VGCS_CHAR(0,n) This parameter allows tocharacterise an handoveradjacency, meaning to beused as for normal CircuitSwitched transaction only, orfor VGCS call only, or forboth.
BSC adj virtualchangeable
number 2 [0, 2] none
EN_INBAND_NOTIF Flag to disable/enable the in-band notification
BSC BSC changeable flag 0 [0, 1] none
EN_INBAND_PAGING Flag to disable/enable the in-band paging
BSC BSC changeable flag 0 [0, 1] none
EN_UPLINK_REPLY Flag to disable/enableuplink reply procedure
BSC BSC changeable flag 0 [0, 1] none
EN_VGCS Flag to disable or enableVGCS in the cell
BSC cell changeable flag 0 [0, 1] none
VGCS
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VGCSOMC-R parameters (2/6)
HMI name Definition Sub-
system
Insta
nce
OMC-R
access
Type Def
value
Range Unit
INBAND_PAGING_
THR
If the eMLPP priorityincluded in the Pagingmessage from the MSC ishigher than or equal to thisparameter, then the BSSshall trigger in-band pagingwithin cells, that areidentified to be paged fromthe PAGING message, and
that have existing VGCactive.
BSC cell changeable threshold
4 [0, 7] none
MAX_VGCS_TS Maximum number of radiotimeslots that can be usedby the VGCS calls in thecell.
BSC cell changeable number 0 [0,127]
none
MIN_VGCS_TS Minimum number of radiotimeslots that are reservedfor the VGCS calls in the cellin normal situation (point-to-
point CS call can NOT usethese timeslots).
BSC cell changeable number 0 [0, 31] none
NOTIF_FACCH_OTHER_VGCS_CALL_THR
If the eMLPP priority ishigher than or equal to thisparameter, the Notificationsmessage shall be sent onFACCH of all other on-goingVGCS call.
BSC cell changeable threshold
0 [0, 7] none
VGCS
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VGCSOMC-R parameters (3/6)
HMI name Definition Sub-system
Instance
OMC-Raccess
Type Defvalue
Range Unit
NOTIF_FACCH_PTP_
CALL_THR
If the eMLPP priority ishigher than or equal to thisparameter, the Notificationsmessage shall be sent onFACCH of all on-going pointto point call whose MS isVGCS capable.
BSC cell changeable threshold
0 [0, 7] none
NOTIF_PCH_THR The priority threshold fornotification over PCH. The
BSS shall consider, forNotification/PCH, onlyVGCS-Calls which have apriority (eMLPP priority) notbelow this parameter. Ifmore than one is selected,all these voice group callsshall be notified on PCH andall with the same frequencyof occurrence.
BSC cell changeable threshold
0 [0, 7] none
NUMBER_NCH_
BLOCKS
This parameter defines the
maximum number of blocksusable for NCH.
BSC cell changeable number 2 [1,7] none
NY2 Maximum number ofrepetitions for the VGCSUPLINK GRANT messageduring an uplink accessprocedure
BSC cell changeable number 3 [1,7] none
VGCS
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VGCSOMC-R parameters (4/6)
HMI name Definition Sub-system
Instance
OMC-Raccess
Type Defvalue
Range Unit
START_UPLINK_REPLY
Maximum number ofrepetitions for the UPLINKFREE message (with theUplink Access Request bitset to L) during the initial partof the uplink accessprocedure (i.e. beforesending the first UPLINKFREE message with theUplink Access Request bit
set to H)
BSC cell changeable number 256 [1,1024]
none
T14 Maximum queuing time forthe VGCS AssignmentRequests
BSC BSC changeable Timer 6 [1,19] sec
T3115 This timer is used for therepetition of the VGCSUPLINK GRANT messageduring the uplink accessprocedure.
BSC cell changeable Timer 200 [100,480]
msec
VGCS
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VGCSOMC-R parameters (5/6)
HMI name Definition Sub-system
Instance
OMC-Raccess
Type Defvalue
Range Unit
T_NOTIF_RESPONSE_
DELAY
Timer to delay the MultipleSACCH Info Modify and theVGCS_ADD_INFO to givethe MS a chance to receivethe immediately transmittedVGCS_ADD_INFO/FACCHand SI 6 messages
BSC BSC changeable Timer 200 [100,1000]
ms
T_REPETITION_
CHANNEL_RELEASE
This parameter defines therepetition period ofCHANNEL RELEASEmessage sent on FACCH
BSC cell changeable Timer 200 [2100,1000]
ms
T_REPETITION_UPLINK_FREE
The UPLINK FREEmessages shall be repeatedas long as no uplink isgranted to a mobile station.This parameter defines therepetition period.
BSC cell changeable Timer 200 [20,480]
ms
T_WAIT_UPLINK_
ACCESS
Guard timer to wait forUplink Access. If no uplinkaccess bursts are receivedat this timer expiry, the BSCreleases (if EN_Uplink_Reply is set to enabled) thevoice group call channel inthat cell and then providesnotifications containing nochannel description.
BSC BSC changeable Timer 60 [3,300]
sec
VGCS
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VGCSOMC-R parameters (6/6)
HMI name Definition Sub-system
Instance
OMC-Raccess
Type Defvalu
e
Range Unit
T_WAIT_UPLINK_REQUEST_ACK
Guard timer to wait forUPLINK REQUEST ACK orUPLINK REQUESTREJECT message from theMSC.
BSC BSC changeable Timer 500 [500,5000]
sec
VGCS_FIX_AMR_HR_CODEC
The type AMR-HR codecused in the network
BSC BSC changeable number 2 [0,3] nonoe
VGCS_FIX_AMR_FR_
CODEC
The type AMR-FR codec
used in the network.
BSC BSC changeable number 1 [0,7] nono
e
WAIT_UPLINK_ACCESS
Maximum number ofrepetitions for the UPLINKFREE message (with theUplink Access Request bitset to L) per cycle, during thenon-initial part of the uplinkaccess procedure (i.e. aftersending the first UPLINKFREE message with theUplink Access Request bitset to H). Each time thevalue of this counterbecomes zero, the BTSsend one UPLINK FREEmessage with the UplinkAccess Request bit set to H.
BSC cell changeable number 3 [1, 32] none
VGCS
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VGCSOther parameters
HMI name Definition Sub-system
Instance
OMC-Raccess
Type Defvalu
e
Range Unit
N201_BTER_D Length of information fieldon FACCH (Format Bter)
BTS BTS None (notin DLS)
number 23 [23,23] bytes
N201_BTER_S Length of information fieldon SACCH (Format Bter)
BTS BTS None (notin DLS)
number 21 [21,21] bytes
VGCS
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VGCSBSC counters (1/2)
New PM type VGCS (type 34); measured object=cellcounter
Mnemonic Definition
V01 NB_PTP_CALL_PREEMPTED_VGCS
Number of CS-calls (point-to-point) pre-empted for VGC-
Channels per cell duringobservation period
V021 AV_PARALLEL_TCH_VGCS Average number of parallel TCHin use for VGCS per cell duringobservation period
V022 MAX_PARALLEL_TCH_VGCS
Maximum number of parallelTCH in use for VGCS per cellduring observation period
V03 NB_VGC_ATTEMPTS_VGCS
Number of VGC establishmentattempts per cell duringobservation period
V04 NB_VGC_SUCCESS_VGCS
Number of VGC successfullyestablished VGC per cell duringobservation period
V05 NB_CM_SERV_REQ_VGCS
Number of receivedCM_SERV_REQ for VGC percell during observation period
V06 NB_VGC_RELEASED_VGCS
Number of released VGC percell during observation period
counter
Mnemonic Definition
V07 NB_HO_ATTEMPTS_VGCS
Number of handover attemptsfor VGC-talker per cell duringobservation period
V08 NB_HO_SUCCESS_VGCS
Number of successful handoverfor VGC-talker per cell during
observation period
V09 NB_INCOMMING_HO_VGCS
Number of incoming handoverfor VGC-talker per cell duringobservation period
V10 NB_OUTGOING_HO_VGCS
Number of outgoing handoverfor VGC-talker per cell duringobservation period
V11 NB_TALKER_CHANGE_VGCS
Number of talker change perestablished VGC in this BSS
during observation periodV12 NB_VGC_BLOCKE
D_VGCSNumber of blocked VGC due tolack of resources per cell duringobservation period
V13 NB_VGCS_NOTIFIFICATION_FACCH
Number of VGC notificationssent over FACCH per cell,differentiated for paging andnotification for VGCS.
VGCS
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VGCSBSC counters (2/2)
New PM type VGCS (type 34); measured object=cellcounter
Mnemonic Definition
V14 NB_ASS_REQ_ABLE_PREEMT_VGCS
Number ofASSIGNMENT_REQUEST ableto pre-empt per cell duringobservation period.Note: The existing counter
NB_TCH_NOR_ASS_HO_REQ_ABLE_TO_PREMPT can notbe used. As a consequence,new counter is needed: only theAssignment Request for thetalker (contains the Talker Flag)message will be counted.
V15 NB_VGCS_ASS_REQ_ABLE_PREEMPT
Number ofVBS/VGCS_ASSIGNMENT_REQUEST able to pre-empt per cellduring observation period
V16 NB_VGCS_QUEUED
VGCs queuing
V17 NB_VGCS_ESTABLISHED
Number of VGCs establishedper cell
A d
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Agenda
B9 features and related parameters:
Enhanced E-GSM band handling
Electromagnetic environment (EME) supervision
Radio Measurement Statistics (RMS) improvementsVoice Group Call Services (VGCS)
Features influencing the B9 channel allocation strategy forCS calls:
Enhanced E-GSM band handling
Voice Group Call Services (VGCS)
Intracell HO cause 30
B9 channel allocation strategy for CS calls
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B9 channel allocation strategy for CS callsInfluence ofEnhanced E-GSM band handling (1/4)
Radio Resource allocation strategyCS allocation for E-GSM capable MS
1.Firstly select a radio timeslot which is E-GSM capable but NOT PS capable;
2.Secondly select a radio timeslot which is neither E-GSM capable nor PS capable;
3.Thirdly select a radio timeslot which is NOT E-GSM capable but PS capable;
4.Finally select a radio timeslot which is E-GSM capable and PS capable.
CS allocation for P-GSM capable only MS
1.Firstly select a radio timeslot which is neither E-GSM capable nor PS capable.
2.Finally select a radio timeslot which is NOT E-GSM capable but PS capable.
PS allocation
High
Low
E-GSM TRX, non-PS capable
Non E-GSM TRX, non-PS capable
Non E-GSM TRX, PS capable
E-GSM TRX, PS capable
CS allocation
High
Low
Non E-GSM TRX, non-PS capable
Non E-GSM TRX, PS capableCS allocation
High
Low
B9 channel allocation strategy for CS calls
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B9 channel allocation strategy for CS callsInfluence ofEnhanced E-GSM band handling (2/4)
TCH allocation criteria for PS capable TRXs(TRX_PREF_MARK =0) is as follows :
PS_PREF_BCCH_TRX (Highest priority to non-BCCH TRX ifPS_Pref_BCCH_TRX = Enable)
HW TRE capability (G3-> G4 MP-> G4 HP)
DR TRE capability (DR TRX ->FR TRX)
E-GSM TRX preference (new in B9, P-GSM TRX ->E-GSM TRX )
PDCH group (smallest PDCH group -> highest PDCH group)
TRX index (high TRX index -> low TRX index) TS index (high TS index -> low TS index)
B9 channel allocation strategy for CS calls
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B9 channel allocation strategy for CS callsInfluence ofEnhanced E-GSM band handling (3/4)
The TCH allocation criteria for non-PS capable TRXs(TRX_PREF_MARK 0) is as follows :
E-GSM TRX preference (new in B9, E-GSM TRX -> P-GSM TRX)
TRX_PREF_MARK (highest TRX_PREF_MARK -> lowestTRX_PREF_MARK)
Mobile allocation (biggest MA -> lowest MA)
Interference band (TS with best interference band-> TS with worstinterference band)
TRX index (highest index -> lowest index)
TS index (highest index -> lowest index)
B9 channel allocation strategy for CS calls
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B9 channel allocation strategy for CS callsInfluence ofEnhanced E-GSM band handling (4/4)
G3 - DR- P-GSM
G3 - DR- E-GSM
G3 - FR- P-GSM
G3 - FR- E-GSM
G4 - MP - DR - P-GSM
G4 - MP - DR - E-GSM
G4 - MP - FR- P-GSM
G4 - MP - FR- E-GSM
G4 - HP - DR - P-GSM
G4 - HP - DR - E-GSM
G4 - HP - FR- P-GSM
G4 - HP - FR- E-GSM
TRX with
TRX_PREF_MARK< >
0
TS 0 TS7
allocation for
CS traffic
RX's with
RX_PREF_MARK= 0
highest priority
lowest priority
allocation for
PS traffic
highest priority
lowest priority
highest prioritylowest priority
highest priority lowest priorityallocation for PS traffic
allocation for CS traffic
Agenda
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Agenda
B9 features and related parameters:
Enhanced E-GSM band handling
Electromagnetic environment (EME) supervision
Radio Measurement Statistics (RMS) improvementsVoice Group Call Services (VGCS)
Features influencing the B9 channel allocation strategy forCS calls:
Enhanced E-GSM band handling
Voice Group Call Services (VGCS)
Intracell HO cause 30
B9 channel allocation strategy for CS calls
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gyInfluence ofVGCS (1/5)
In order to have the impacts as small as possible on the currentimplemented CS and (E)GPRS radio resource management, thefollowing principles applies on the VGCS radio resource management:
1. No new radio channel type from O&M point of view: A timeslotconfigured as TCH timeslot by O&M can be used as PDCH or as
VGCS channel or standard CS TCH channel.2. The current radio resource management for CS and (E)GPRS on TRX
basis is kept.
3. No impact on (E)GPRS radio resource management: from the MFSpoint of view, there is NO difference between VGCS traffic andstandard point-to-point CS traffic.
4. The BSC CS radio resource management is modified to take intoaccount the VGCS: a timeslot configured as TCH timeslot by O&M isconsidered by the BSC as a TCH timeslot reserved for VGCS and CStraffic when it is identified neither as MPDCH timeslot nor asTCH/SPDCH/VGCH timeslot
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gyInfluence ofVGCS (2/5)
From BSC RAM (Radio resource allocation and Management) point of view, thefollowing types of service oriented timeslots are supported:
Pure BCCH timeslot: timeslot configured as BCC by O&M; carries common CS signalling.
Pure SDCCH timeslot: timeslot configured as a CBC or SDC by O&M; can carry SDCCHtraffic.
Pure TCH timeslot: timeslot configured as TCH by O&M; carries only TCH traffic (appliesonly to inner zone of contentric cells).
TCH/VGCH timeslot: timeslot configured as TCH by O&M; carries TCH or VGCH traffic.
TCH/SPDCH/VGCH timeslot: timeslot configured as TCH by O&M; is dynamicallyallocated as TCH or as SPDCH depending on the usage of the timeslot; can carry TCHtraffic, VGCH traffic or PS traffic.
TCH/SDCCH timeslot: configured as SDD by O&M; is dynamically allocated as TCH or asSDCCH depending on the usage of the timeslot; can carry TCH traffic or SDCCH traffic.
MPDCH timeslot: configured as TCH by O&M;can only carry common PS signalling.
From O&M side it is not possible to fix the localisation of these serviceoriented timeslots. Only the number of these timeslots can be configured.
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gyInfluence of VGCS (3/5)
GPRS
CS
GPRS/CSVGCS
VGCS/CS
VGCS/CS/GPRS
GSM 900 or DCS 1800
GSM 900GSM 900
Without VGCS
1. TRX
not installed
not installed
With VGCS
2. TRX
3. TRX
4. TRX
5. TRX
Additionalcapacityfor
VGCS
(optiona
l)
Min_PDCH
Max_PDCH
TRX_PREF_MARK=0
TRX_PREF_MARK 0 TRX_PREF_MARK 0 TRX_PREF_MARK 0
Min_VGCS_TS
Max_VGCS_TSthese TS are
point-to-
point
CS only
these TS areCS/VGCS switch-ablebut the VGCS
has priority
Legend: the colours show
the type of traffic handled
by the timeslot
B9 channel allocation strategy for CS calls
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gyInfluence ofVGCS (4/5)
For the radio TCH allocation on TCH/VGCH timeslots (I.e.TRX_PREF_MARK0) due to a VGCS request:
=>the same principles and criteria are used as for the radio TCHallocation on TCH/VGCH timeslots due to a TCH request
For the radio TCH allocation on TCH/SPDCH/VGCHtimeslots (I.e. TRX_PREF_MARK=0) due to a VGCSrequest:
=>the same principles and criteria are used as for the radio TCHallocation on TCH/SPDCH/VGCH timeslots due to a TCH request
B9 channel allocation strategy for CS calls
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gyInfluence ofVGCS (5/5)
Parameters in B9
HMI name Definition Sub-system
Instance
OMC-Raccess
Type Defvalu
e
Range Unit
MAX_VGCS_TS Maximum number of radio
timeslots that can be usedby the VGCS calls in thecell.
BSC cell changeable number 0 [0, 127] none
MIN_VGCS_TS Minimum number of radiotimeslots that are reservedfor the VGCS calls in the cellin normal situation (point-to-point CS call can NOT usethese timeslots).
BSC cell changeable number 0 [0, 31] none
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gyOverview on next slides
The following slides show how VGCS is taken into accountby the Radio resource updating function in the Radio
Allocation and Management (RAM) process for:
the evaluation of the cell load
the evaluation of the number of TCH/SPDCH/VGCH timeslots thancan be allocated to the MFS, the substeps being:
MAX_SPDCH_LIMIT calculation
MAX_SPDCH_LIMIT TS selection
Consideration of VGCS for the PS Load
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evaluation (1/5)
The BSC takes every TCH_INFO_PERIODs a sample of the currentusage on TCH/VGCH, TCH/SDCCH and TCH/SPDCH/VGCH TS
At the expiry of the TCH_INFO_PERIOD timer, the timer is re-startedand the following load samples are calculated:
NB_USED_CS_TS(k)
NB_USED_PS_TS(k) NB_USED_VGCS_TS(k)
NB_USED_TS(k) = NB_USED_CS_TS(k) + NB_USED_PS_TS(k) +NB_USED_VGCS_TS(k)
NB_UNUSED_TS(k)
TCH_INFO_PERIOD = 5s
NB_USED_CS_TS(k)
NB_USED_PS_TS(k)
NB_USED_VGCS_TS(k)
NB_USED_TS(k)
NB_UNUSED_TS(k)
Consideration of VGCS for the PS Load
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evaluation (2/5)
NB_USED_CS_TS(k): number of available timeslots handled by the BSC andcarrying CS traffic in the cell at sampling instant tk
a TS is taken into account in the evaluation of NB_USED_CS_TS(k) if:
SPDCH allocation state = not allocated
Occupancy state = used (i.e. the TS is currently carrying CS traffic or is allocated asSDCCH)
NB_USED_PS_TS(k): number of available timeslots used for PS traffic in thecell at sampling instant tk
a TS is taken into account in the evaluation of NB_USED_PS_TS(k) if:
SPDCH allocation state = allocated or de-allocating
Occupancy state = used
NB_USED_VGCS_TS(k): number of available timeslots handled by the BSC
and carrying VGCS traffic in the cell at sampling instant tk a TS is taken into account in the evaluation of NB_USED_VGCS_TS(k) if:
SPDCH allocation state = not allocated
Occupancy state = used
Consideration of VGCS for the PS Load
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evaluation (3/5)
NB_UNUSED_TS(k): at the expiry of TCH_INFO_PERIOD timer, theBSC computes the number of unused timeslots at sampling instant tk NB_UNUSED_TS(k) = NB_TS(k) NB_USED_CS_TS(k)
max(NB_USED_VGCS_TS(k), MIN_VGCS_TS) max(MIN_SPDCH(k),NB_USED_PS_TS(k))
NB_TS(k): total number of TCH/VGCH, TCH/SDCCH orTCH/SPDCH/VGCH timeslots available in the cell. This parameter is re-computed every RR_ALLOC_PERIOD * TCH_INFO_PERIOD to take intoaccount possible TRX failure
MIN_SPDCH(k): minimum number of SPDCHs that are always allocated tothe MFS. This parameter is re-computed every RR_ALLOC_PERIOD *TCH_INFO_PERIOD to take into account possible TRX failure
Consideration of VGCS for the PS Loadl i (4/ )
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evaluation (4/5)
Load evaluation: for each cell, every RR_ALLOC_PERIOD * TCH_INFO_PERIOD, the BSC
computes four averaged values through a sliding window of sizeLOAD_EV_PERIOD_GPRS (default value = 3):
AV_USED_CS_TS(k) =
(1/LOAD_EV_PERIOD_GPRS)*i=0 to LOAD_EV_PERIOD_GPRS -1 NB_USED_CS_TS(k-i)
AV_USED_PS_TS(k) =
(1/LOAD_EV_PERIOD_GPRS)*i=0 to LOAD_EV_PERIOD_GPRS -1 NB_USED_PS_TS(k-i)
AV_USED_VGCS_TS(k) =
(1/LOAD_EV_PERIOD_GPRS)*i=0 to LOAD_EV_PERIOD_GPRS -1 NB_USED_VGCS_TS(k-i)
AV_UNUSED_TS(k) = (1/LOAD_EV_PERIOD_GPRS)*i=0 to LOAD_EV_PERIOD_GPRS -1 NB_UNUSED_TS(k-i)
Consideration of VGCS for the PS Loadl ti (5/5)
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evaluation (5/5)
TCH_INFO_PERIOD = 5s
AV_USED_CS_TS(k)
AV_USED_PS_TS(k)
AV_USED_VGCS_TS(k)
AV_UNUSED_TS(k)
NB_USED_CS_TS(k)
NB_USED_PS_TS(k)NB_USED_VGCS_TS(k)
NB_USED_TS(k)
NB_UNUSED_TS(k)
kk-1k-2
LOAD_EV_PERIOD = 3
k+1 k+2
AV_USED_CS_TS(k+2)
AV_USED_PS_TS(k+2)
AV_USED_VGCS_TS(k+2)
AV_UNUSED_TS(k+2)
RR_ALLOC_PERIOD * TCH_INFO_PERIOD
Consideration of VGCS for theMAX SPDCH LIMIT l l ti (1/7)
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MAX_SPDCH_LIMIT calculation (1/7)
MAX_SPDCH_LIMIT calculation:
the BSC periodically (every RR_ALLOC_PERIOD *TCH_INFO_PERIOD) computes the number of Slave PDCHs that itcan provide to the MFS: MAX_SPDCH_LIMIT
MAX_SPDCH_HIGH_LOAD
Computation of CS/PS
Margin
AV_USED_CS_TSAV_USED_PS_TSAV_UNUSED_TS
NB_TS_DEFINEDNB_TS_SPDCH
Computation of
Thresholds
THR_MARGIN_PRIORITY_CSTHR_MARGIN_PRIORITY_PS
NB_TS
MARGIN_PRIORITY_CSMARGIN_PRIORITY_PS
Computation of
MAX_SPDCH_LIMIT
MAX_PDCH_HIGH_LOADMAX_PDCHMIN_PDCH
NB_TS_MPDCH
MAX_SPDCH_LIMIT
MIN_SPDCHMAX_SPDCH
O&M parameters
O&M parameter= 100 HIGH_TRAFFIC_LOAD_GPRS
Consideration of VGCS for theMAX SPDCH LIMIT l l ti (2/7)
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MAX_SPDCH_LIMIT calculation (2/7)
Calculation of MIN_SPDCH, MAX_SPDCH andMAX_SPDCH_HIGH_LOAD:
re-evaluated every RR_ALLOC_PERIOD * TCH_INFO_PERIOD totake into account TRX failures
introduction of a ratio named AVAILABILITY_TS_RATIO(k), evaluatedperiodically every RR_ALLOC_PERIOD * TCH_INFO_PERIOD atinstant tk:
= (NB_TS(k) MIN_VGCS_TS) / (NB_TS_DEFINED MIN_VGCS_TS)
NB_TS_DEFINED: total number of TCH/VGCH, TCH/SDCCH or
TCH/SPDCH/VGCH timeslots available in the cell if there is no TRX failure.This parameter is retrieved from the O&M configuration of the cell
Consideration of VGCS for theMAX SPDCH LIMIT l l ti (3/7)
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MAX_SPDCH_LIMIT calculation (3/7)
Calculation of MIN_SPDCH, MAX_SPDCH andMAX_SPDCH_HIGH_LOAD:
MAX_SPDCH(k) = RoundUp[ min(MAX_PDCH NB_TS_MPDCH,NB_TS_SPDCH) *AVAILABILITY_TS_RATIO(k) ]
NB_TS_SPDCH: total number of TCH/SPDCH/VGCH timeslots available inthe cell if there is no TRX failure. This parameter is retrieved from the O&Mconfiguration of the cell
MAX_SPDCH_HIGH_LOAD(k) = RoundUp[ min(MAX_PDCH_HIGH_LOAD NB_TS_MPDCH, NB_TS_SPDCH) *
AVAILABILITY_TS_RATIO(k) ]
MIN_SPDCH(k) = RoundUp[ (MIN_PDCH NB_TS_MPDCH) *AVAILABILITY_TS_RATIO(k) ]
Consideration of VGCS for theMAX SPDCH LIMIT l l ti (4/7)
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MAX_SPDCH_LIMIT calculation (4/7)
Margins for CS and PS traffics: two new margins, one for CS traffic and one for PS traffic are
introduced to guarantee that a certain number of timeslots are keptavailable for the arrival of new calls between two transmissions of theRR Allocation Indication message:
the first margin, named MARGIN_PRIORITY_CS, is dedicated to CS traffic
the second margin, named MARGIN_PRIORITY_PS, is dedicated to PStraffic
these two margins are re-evaluated every RR_ALLOC_PERIOD *TCH_INFO_PERIOD, before the computation of MAX_SPDCH_LIMIT
MARGIN_PRIORITY_CS(k) = (THR_MARGIN_PRIO_CS *(NB_TS(k) MAX_SPDCH_HIGH_LOAD(k)) / 100
MARGIN_PRIORITY_PS(k) = (THR_MARGIN_PRIO_PS *MAX_SPDCH_HIGH_LOAD(k)) / 100
Consideration of VGCS for theMAX SPDCH LIMIT l l ti (5/7)
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MAX_SPDCH_LIMIT calculation (5/7)
MAX_SPDCH_LIMIT calculation:
the basic idea to evaluate MAX_SPDCH_LIMIT is to estimate thenumber of unused TS and to share them between CS and PS traffic,taking into account both margins (for CS and PS traffics) defined to
guarantee a certain number of TS available to serve incoming calls
Computation of
MAX_SPDCH_LIMIT_CS
MARGIN_PRIORITY_CS
AV_USED_CS_TS(k)AV_UNUSED_TS(k)
MAX_SPDCH_LIMIT_CS(k)
Computation of
MAX_SPDCH_LIMIT_PSAV_USED_PS_TS(k)
MAX_SPDCH_LIMIT_PS(k)
MIN_SPDCHMARGIN_PRIORITY_PS
Computation of
MAX_SPDCH_LIMIT
MAX_SPDCHMAX_SPDCH_HIGH_LOAD
MAX_SPDCH_LIMIT(k)
Consideration of VGCS for theMAX SPDCH LIMIT l l ti (6/7)
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MAX_SPDCH_LIMIT calculation (6/7)
MAX_SPDCH_LIMIT calculation:
MAX_SPDCH_LIMIT_CS:
determines the maximum number of SPDCHs that can be allocated to the MFS inorder to ensure that a certain number of timeslots (margin) is kept in the BSC to servepossible incoming CS requests received between two sendings of the RR AllocationIndication message
MAX_SPDCH_LIMIT_CS(k) = RoundDown [ NB_TS(k) max (MIN_VGCS_TS(k) ;AV_USED_VGCS_TS(k)) AV_USED_CS(k) - MARGIN_CS(k) ]
MARGIN_CS(k) = max(MARGIN_PRIORITY_CS(k), AV_UNUSED_TS(k) / 2)
MAX_SPDCH_LIMIT_PS:
determines the minimum number of SPDCHs that should be allocated to the MFS inorder to ensure that a certain number of timeslots (margin) is kept in the MFS to
possibly serve incoming PS requests if AV_USED_PS_TS(k) is lower or equal than MIN_SPDCH then
MAX_SPDCH_LIMIT_PS(k) = MIN_SPDCH(k)
else MAX_SPDCH_LIMIT_PS(k) = RoundUp (AV_USED_PS_TS(k) +MARGIN_PRIORITY_PS(k))
Consideration of VGCS for theMAX SPDCH LIMIT calc lation (7/7)
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MAX_SPDCH_LIMIT calculation (7/7)
MAX_SPDCH_LIMIT calculation:
it can be in the range of [MIN_SPDCH, MAX_SPDCH]
its value can be either MAX_SPDCH_LIMIT_CS orMAX_SPDCH_LIMIT_PS
Zone whereMAX_SPDCH_LIMIT = MIN( MAX_SPDCH,
MAX_SPDCH_LIMIT_CS)
Zone whereMAX_SPDCH_LIMIT = MIN(MAX_SPDCH_LIMIT_PS,
MAX_SPDCH_HIGH_LOAD)
0
MAX_SPDCH
MAX_SPDCH_HIGH_LOAD
MIN_SPDCH
MIN_SPDCH
MAX_SPDCH_LIMIT_CS
MAX_SPDCH_HIGH_LOAD MAX_SPDCH
MAX_SPDCH_LIMIT_PS
Consideration of VGCS for theMAX SPDCH LIMIT TS selection (1/8)
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MAX_SPDCH_LIMIT TS selection (1/8)
PS TS and TRX ordering:
the first step consists in ordering the PS timeslots and the PS TRX soas to obtain an ordered list of TCH/SPDCH/VGCH timeslots
the ordering of the timeslots is based on the following criteria:
selection of the TRX: the TRX having the lowest rank in the TRX rankingtable (refer to the slide on TRX priority) is selected first
selection of the TS: once the TRX has been selected, theTCH/SPDCH/VGCH timeslots having the lowest timeslot index, i.e. locatedat the most left side of the TRX, is selected first
Consideration of VGCS for theMAX SPDCH LIMIT TS selection (2/8)
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MAX_SPDCH_LIMIT TS selection (2/8)
Different PS TS zones:MAX_SPDCH_HIGH_LOAD zone:
this zone corresponds to the MAX_SPDCH_HIGH_LOAD consecutive PScapable TS that are preferred for PS allocation
in this zone, allocated TBFs cannot be pre-empted
Non pre-emptable PS zone:
this zone is always inside the MAX_SPDCH_HIGH_LOAD zone
in this latter zone, we search for the rightest TS allocated to the MFS andused. Then, all the TS located at its left define the non pre-emptable PSzone
inside this zone, a TS: remains allocated to the MFS if already allocated to the MFS
is allocated to the MFS if previously allocated to the BSC and unused
remains allocated to the BSC if already allocated to the BSC and used
Consideration of VGCS for theMAX SPDCH LIMIT TS selection (3/8)
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MAX_SPDCH_LIMIT TS selection (3/8)
Different PS TS zones:
MAX_SPDCH_LIMIT zone:
this zone corresponds to the MAX_SPDCH_LIMIT consecutive PS capableTS that are preferred for PS allocation
inside this zone, a TS:
remains allocated to the MFS if already allocated to the MFS
is allocated to the MFS if previously allocated to the BSC and unused
remains allocated to the BSC if already allocated to the BSC and used
PS traffic zone:
this zone corresponds to the larger zone between the non pre-emptable PSzone and the MAX_SPDCH_LIMIT zone
Consideration of VGCS for theMAX SPDCH LIMIT TS selection (4/8)
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MAX_SPDCH_LIMIT TS selection (4/8)
Different PS TS zones:
example: MAX_SPDCH_HIGH_LOAD = 8, MAX_SPDCH_LIMIT = 10
example: MAX_SPDCH_HIGH_LOAD = 8, MAX_SPDCH_LIMIT = 3
TRX2 TRX1
1 3 42 5 6 7 8 9 10 1211 13 14 15 16
MAX_SPDCH_LIMIT zone
PS CSPS CS CSCS CS
MAX_SPDCH_HIGH_LOAD zone
PS PS PS PS
Non pre-emptable PS zone
PS traffic zone
TRX2 TRX1
1 3 42 5 6 7 8 9 10 1211 13 14 15 16
MAX_SPDCH_LIMIT zone
PS CSPS CS CSCS CS
MAX_SPDCH_HIGH_LOAD zone
PS CS CS
Non pre-emptable PS zone
PS traffic zone
CS
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MAX_SPDCH_LIMIT TS selection (5/8)
Selection of the TCH/SPDCH/VGCH TS:
to be selected, the states of a TCH/SPDCH/VGCH timeslot must havethe following values:
SPDCH allocation state = allocated: the timeslot is already allocated to the
MFS SPDCH allocation state = not allocated and occupancy state = unused:
the timeslot is allocated to the BSC but there is no CS traffic on it
Consideration of VGCS for theMAX SPDCH LIMIT TS selection (6/8)
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MAX_SPDCH_LIMIT TS selection (6/8)
Selection of the TCH/SPDCH/VGCH TS:
the process begins with the non pre-emptable PS zone:
all the TS in this zone that can be or are allocated to the MFS are allocated to theMFS. The verification in terms of number of TS allocated to the MFS is done onlywhen all the TS inside this zone have been handled
if at the end of the non pre-emptable PS zone, the number of selected TS forthe MFS is strictly lower than MAX_SPDCH_LIMIT then the process ofselection continues in the MAX_SPDCH_LIMIT zone
if at the end of the MAX_SPDCH_LIMIT zone, the number of selected TS forthe MFS is still lower than MAX_SPDCH_LIMIT, the process continuesoutside this zone until this number reaches MAX_SPDCH_LIMIT
once MAX_SPDCH_LIMIT TS have been selected, all the remaining
TCH/SPDCH/VGCH TS are now allocated to the BSC, even if they werepreviously allocated to the MFS. This means that a TS with a SPDCHallocation state set to allocated that is no more allocated to the MFS, has itsSPDCH allocation state set to de-allocating
Consideration of VGCS for theMAX SPDCH LIMIT TS selection (7/8)
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MAX_SPDCH_LIMIT TS selection (7/8)
Pre-reservation mechanism in the PS traffic zone:
in order to increase the PS capacity and limit the occurrence of holesin the SPDCHs_Allocation bitmap, each TCH/SPDCH/VGCH capableTS carrying CS traffic and located inside the PS traffic zone, has its
pre-reservation state set to pre-reserved for PS. No new incomingCS call can be served on this TS, if it becomes unused once it is pre-reserved for PS. This is valid until the TS becomes not pre-reservedfor PS again and of course still handled by the BSC
the modification of the value of the pre-reservation state can onlyoccur when the SPDCHs_Allocation bitmap is built, every
TCH_INFO_PERIOD * RR_ALLOC_PERIOD seconds
Consideration of VGCS for theMAX SPDCH LIMIT TS selection (8/8)
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MAX_SPDCH_LIMIT TS selection (8/8)
Pre-reservation mechanism in the PS traffic zone:
the following transition can be foreseen for a timeslot inside the PS trafficzone:
it goes from not pre-reserved for PS to pre-reserved for PS or remains in pre-reserved for PS if it is in one of the two following situations:
SPDCH allocation state = not allocated and occupancy state = used SPDCH allocation state = de-allocating
it goes from pre-reserved for PS to not pre-reserved for PS or remains in not pre-reserved for PS if it is in the following situation:
SPDCH allocation state = allocated
the following transition can be foreseen for a timeslot outside the PS trafficzone:
it goes from pre-reserved for PS to not pre-reserved for PS or remains in not pre-reserved for PS if it is in one of the following situations:
SPDCH allocation state = not allocated
SPDCH allocation state = allocated
SPDCH allocation state = de-allocating
Agenda
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g
B9 features and related parameters:
Enhanced E-GSM band handling
Electromagnetic environment (EME) supervision
Radio Measurement Statistics (RMS) improvementsVoice Group Call Services (VGCS)
Features influencing the B9 channel allocation strategy forCS calls:
Enhanced E-GSM band handling
Voice Group Call Services (VGCS)
Intracell HO cause 30
B9 channel allocation strategy for CS callsInfluence of Intracell HO cause 30 (1/4)
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Influence of Intracell HO cause 30 (1/4)
Intracell HO cause 30 =>applies for CS calls in the Non pre-emptable PSzone, independent of VGCS usage:
to speed up the release of a TS carrying a CS call inside both the non pre-emptable PS zone and the MAX_SPDCH_LIMIT zone, the concerned CS calls inthe CS zone are reallocated using an intra-cell handover (cause 30)
if EN_RETURN_CS_ZONE_HO = enabled, each time MAX_SPDCH_LIMIT iscalculated, the BSC shall check whether TCHs are allocated in both theMAX_SPDCH_LIMIT zone and the non pre-emptable PS zone.In this case, it shall send a Start HO (cause 30) message to the HO Preparationentity, to trigger an intracell handover, to move these TCHs into the CS zone
if for any reason, the handover fails, the TCH will remain in the PS zone, until thenext calculation of MAX_SPDCH_LIMIT, where a new HO could be triggered, if
still needed the TS will be considered as unused only once the handover will have been
successfully performed. As the pre-reservation state of such a TS is set to pre-reserved for PS, no new incoming CS call can be allocated on it
B9 channel allocation strategy for CS callsInfluence of Intracell HO cause 30 (2/4)
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Influence of Intracell HO cause 30 (2/4)
This CS call is not candidate for theintra cell HO as it is outside the nonpre-emptable PS zone
TRX1
MAX_SPDCH zone
PS PSPS PS CSCS CS
TRX2
MAX_SPDCH_HIGH_LOAD zone
PS CS CS PS
MAX_SPDCH_LIMITzone
MIN_SPDCH zone
PS
PS traffic zone CS traffic zone
1 3 42 5 6 7 8 9 10 1211 13 14 15 16BC SD
Non pre-emptable PS zone
Intra cell HO to move thisCS call to the CS traffic zone
B9 channel allocation strategy for CS callsInfluence of Intracell HO cause 30 (3/4)
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Influence of Intracell HO cause 30 (3/4)
BCC SDC PS PS PS PS PS CS PS CS PS CS CS CS
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
TRX 1 TRX 2
MIN_SPDCH zone
MAX_SPDCH_HIGH_LOAD zone
MAX_SPDCH_LIMIT zone
MAX_SPDCH zone
non pre-emptable PS zone
PS traffic zone CS traffic zone
this call is not a candidate for HO cause 30
B9 channel allocation strategy for CS callsInfluence of Intracell HO cause 30 (4/4)
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Influence of Intracell HO cause 30 (4/4)
HMI name Definition Sub-system
Instance
OMC-Raccess
Type Defvalu
e
Range Unit
EN_RETURN_CS_
ZONE_HO
Flag enabling the intracellhandovers allowing to move
TCH from the PS zone to theCS zone of PDCH/TCHallocation
BSC cell changeable flag 1 [0,1] none
Parameter in B9
End of presentation
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