Day1 slot3 br radio configuration assessment and bss radio configurationv0.4

Soc Classification level Presentation / Author / Date 1 © Nokia Siemens Networks

BR radio configuration assessment and BSS radio configuration planning

Soc Classification level

Presentation / Author / Date 2 © Nokia Siemens Networks

BR Configuration assessment and BSS planningExample (1 cell with 8TRXs)• Signalling allocation

– CCCH is removed (not available in BSS)– TCHSD is removed (not available in BSS)– SDCCH capacity is the same (dynamic SDCCH on BSS?)– BCCH is not on the same TRX (frequency channel?)

• TCH allocation– Rule of TCHD allocation

• TRXMD and GTRX– PS on non-BCCH on both system, but the setup is different (see next slide)

• Too many SDCCH TSLs are allocated statically (dynamic SDCCH?)

BR TRXMD

Gemini GTRX

GSWUXI3TSL0 TSL1 TSL2 TSL3 TSL4 TSL5 TSL6 TSL7

BR setup TRX0 MBCCH SDCCH CCCH TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF GSMBSS TRX-017 SDCCH TCHFR TCHD TCHD TCHD TCHD TCHD TCHD nBR setup TRX1 SDCCH TCHF_HLF TCHF_HLF TCHSD TCHSD TCHF_HLF TCHF_HLF TCHF_HLF GSMBSS TRX-018 SDCCH TCHD TCHD TCHD TCHD TCHD TCHD TCHD nBR setup TRX2 SDCCH TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF EDGEBSS TRX-019 SDCCH TCHF TCHF TCHF TCHF TCHF TCHF TCHF yBR setup TRX3 SDCCH TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF GSMBSS TRX-020 SDCCH TCHD TCHD TCHD TCHD TCHD TCHD TCHD nBR setup TRX4 SDCCH TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF GSMBSS TRX-021 SDCCH TCHF TCHF TCHF TCHF TCHF TCHF TCHF yBR setup TRX5 SDCCH TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF GSMBSS TRX-022 SDCCH TCHF TCHF TCHF TCHF TCHF TCHF TCHF yBR setup TRX6 SDCCH TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF GSMBSS TRX-023 MBCCH SDCCH TCHF TCHF TCHF TCHF TCHF TCHF nBR setup TRX7 SDCCH TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF GSMBSS TRX-024 SDCCH TCHD TCHD TCHD TCHD TCHD TCHD TCHD n



BR Configuration assessment and BSS planningExample (1 cell with 8TRXs)• Signalling and voice capacity on air interface

BR BSSCCCH 1 -

SDDCH/8 9 8TCHSD/8 2 -SDCCH total: 11 8

TCH_HFR 52 -TCHF - 24TCHD - 27CS total (FR+HR): 108 78



BR Configuration assessment and BSS planningExample (1 cell with 8TRXs)

Layer preferation:

The TRXs are treated on the same level both for CS and PS.

(E)GPRS enabling:

All the TRXs are GPRS and EGPRS enabled, but TRXMD and GTRX is the limiting setup.

(E)GPRS territory:

The offered capacity is not the same on BR and BSS:

LAYERID LAYERID CRTSWSPELLPRM GLLPRM ELLPRMLY_00 LY_00 LY_00 LY_00 LY_00

BFG TRP0 0

BR

BSS

EGPRS EEDGETRUE TRUEGENA EGENA

y y

BR

BSS

GMANPRESPRM EMANPRESPRM GPDPDTCHA3 2 22

CMAX CDEF CDED100 29% (6RTSL) 20% (4RTSL)

BR

BSS

BR: (5+7+7+7+7+7+7+7-3-2)*0.22=10 TSL

10+3+2=15 -> 15 TSLs can be used for PS in BR

13 for GPRS

7 for EGPRS

BSS: 7*3=21 -> 21 TSLs can be used for PS in BSS (both for GPRS and EGPRS)



BR Configuration assessment and BSS planningExample (1 segment with 10 TRXs)• Signalling allocation

– CCCH is removed (not available in BSS)

– TCHSD is removed (not available in BSS)

– SDCCH capacity is the same (dynamic SDCCH on BSS?)

– BCCH is not on the same TRX (frequency channel?)

• TCH allocation– Rule of TCHD allocation

• TRXMD and GTRX– PS on non-BCCH on both system, but the setup is different (see next slide)

BR TRXMD

Gemini GTRX

GSANYUAN2TSL0 TSL1 TSL2 TSL3 TSL4 TSL5 TSL6 TSL7

BR setup TRX0 MBCCH SDCCH CCCH SDCCH CCCH SDCCH TCHF_HLF TCHF_HLF GSMBSS TRX-009 SDCCH TCHF TCHF TCHD TCHD TCHD TCHD TCHD nBR setup TRX1 SDCCH TCHF_HLF TCHF_HLF TCHSD TCHSD TCHF_HLF TCHF_HLF TCHF_HLF GSMBSS TRX-010 SDCCH TCHF TCHF TCHF TCHF TCHF TCHF TCHF yBR setup TRX2 SDCCH TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF EDGEBSS TRX-011 SDCCH SDCCH TCHF TCHF TCHF TCHF TCHF TCHF yBR setup TRX3 SDCCH TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF GSMBSS TRX-012 MBCCH SDCCH SDCCH TCHF TCHF TCHF TCHF TCHF nBR setup TRX4 SDCCH SDCCH TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF GSMBSS TRX-013 SDCCH SDCCH TCHF TCHF TCHF TCHF TCHF TCHF yBR setup TRX5 SDCCH SDCCH SDCCH SDCCH TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF GSMBSS TRX-014 SDCCH SDCCH TCHF TCHF TCHF TCHF TCHF TCHF y

GSANYUAN2EBR setup TRX6 TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF GSMBSS TRX-015 TCHD TCHD TCHD TCHD TCHD TCHD TCHD TCHD nBR setup TRX7 TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF GSMBSS TRX-016 TCHD TCHD TCHD TCHD TCHD TCHD TCHD TCHD nBR setup TRX8 TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF GSMBSS TRX-017 TCHD TCHD TCHD TCHD TCHD TCHD TCHD TCHD nBR setup TRX9 TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF GSMBSS TRX-018 TCHD TCHD TCHD TCHD TCHD TCHD TCHD TCHD nBR setup TRX10 TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF TCHF_HLF GSMBSS TRX-019 TCHD TCHD TCHD TCHD TCHD TCHD TCHD TCHD n



BR Configuration assessment and BSS planningExample (1 segment with 10 TRXs)• Signalling and voice capacity on air interface

BR BSS

CCCH 2 -

SDDCH/8 12 10

TCHSD/8 2 -

SDCCH total: 14 10

TCH_HFR 71 -

TCHF - 28

TCHD - 45

CS total (FR+HR): 144 118



Upper limit for free FR TCHs- btsSpLoadDepTCHRate � BTS level- btsLoadDepTChRate � BSC level

Lower limit for free FR TCHs- btsSpLoadDepTCHRate � BTS level- btsLoadDepTChRate � BSC level

Allocation of FR TCHs

Allocation of HR TCHs

Allocation of FR TCHs

• Free FR TCHs based on ratio of available to working FR TCHs

• Process is disabled by setting lower limit > upper limit

• Enabling load analysis at BTS level automatically disables it at a BSC level

• To disable at BTS level must be disabled at both BTS and BSC level

BR Configuration assessment and BSS planning HR - TCH Allocation based on Cell Load

FRU: 20, 40, 100...

FRL: 0, 20, 30...



BR Configuration assessment and BSS planningExample (1 segment with 10 TRXs)

Layer preferation:

The TRXs are treated on the same level both for CS and PS.

(E)GPRS enabling:

Some of the TRXs are GPRS enabled only, but TRXMD and GTRX is the limiting factor.

(E)GPRS territory:

The offered capacity is not the same on BR and BSS:

BR: (2+7+7+7+6+4+8+8+8+8+8-3-2)*0,12= 8TSL

8+3+2=13 -> 13 TSLs can be used for PS in BR

11 for GPRS

6 for EGPRS

BSS: 7*2+6*2=25 -> 25 TSLs can be used for PS in BSS (both for GPRS and EGPRS)

EGPRS EEDGETRUE TRUEGENA EGENA

y y

y nBTS2

BR

BSS BTS1

GMANPRESPRM EMANPRESPRM GPDPDTCHA3 2 12

CMAX CDEF CDED100 24% (6RTSL) 16% (4RTSL)

BR

BSS

LAYERID LAYERID CRTSWSPELLPRM GLLPRM ELLPRMLY_00 LY_00 LY_00 LY_00 LY_00

BFG TRP0 0

BR

BSS



BR configuration assessment and BSS planningParameters• BR

– LAYERID= LY_xx Service Layer ID, this parameter is used for the feature 'Service Dependent Channel Allocation' and defines the

service layer this TRX belongs to.– CRTSWSPELLPRM= LY_xx

Circuit switched speech layer list primary, this parameter defines list of TRX layers assigned to circuit switched speech call applying EFR-FR-HR codec in a single band standard cell, or in the complete/far area of a dual area cell (extended, concentric single/dual band), or in the BCCH band of a dual band standard cell. The service layers of the SLL are defined in a decreasing priority order, i.e. the entered sequence of layer-IDs determines the layer preference for the resource allocation for this service.

– GLLPRM=LY_xx GPRS layer list primary, this parameter defines list of TRX layers assigned to GPRS service in a single band

standard cell, or in the complete/far area of a dual area cell (extended, concentric single/dual band), or in the BCCH band of a dual band standard cell. The service layers of the SLL are defined in a decreasing priority order, i.e. the entered sequence of layer-IDs determines the layer preference for the resource allocation for this service.

– ELLPRM= LY_xx EDGE layer list primary, this parameter defines list of TRX layers assigned to EDGE service in a single band

standard cell, or in the complete/far area of a dual area cell (extended, concentric single/dual band), or in the BCCH band of a dual band standard cell. The service layers of the SLL are defined in a decreasing priority order, i.e. the entered sequence of layer-IDs determines the layer preference for the resource allocation for this service.

• BSS– TRP

With this parameter you define whether the BCCH TRX or other TRXs (of the regular frequency area) are preferred in traffic channel allocation.

– BFG With this parameter you define whether the BCCH TRX or other TRXs are preferred in GPRS channel allocation.




– TRXMD=GSM TRX Mode, this parameter indicates the capability of the TRX to support EDGE. This parameter can only be set to the value EDGE, if the

TRX-HW which is associated to the created TRX object an EDGE CU (ECU). • Carrier Unit (CU, first model, introduced in the early 1990)• GPRS Carrier Unit (G-CU)• EDGE Carrier Unit (E-CU)• Flexible Carrier Unit (FlexCU)

– EGPRS=TRUE Enable GPRS, this parameter allows to enable/disable GPRS on a per cell basis. As this parameter can only be set to TRUE, if at least one

of the TRXs in the cell supports GPRS (this is the case if the TRX is defined as belonging to a service layer which is included in the SLL for GPRS services - please see command SET BTS [SERVICE] for further explanations).

– EEDGE=TRUE Enable EDGE, this parameter allows to enable/disable EGPRS (EDGE GPRS) on a per cell basis. As this parameter can only be set to

TRUE, if at least one of the TRXs in the cell support EDGE (see parameter TRXMD in command CREATE TRX). – GPDPDTCHA=100

GPRS Percentage of dynamic PDTCH Available, this parameter indicates the percentage of available 'shared' traffic channels that may be used for GPRS traffic. 'Shared traffic channels' are those channels (TCHFULL, TCHF_HLF, TCHSD in TCHPOOL) for which the parameter GDCH is set to <NULL> (see CREATE CHAN for TCH) and for which the superordinate TRX is in service and available for (E)GPRS service

• BSS– GTRX

With this parameter you define whether the GPRS, EGPRS, or Extended Cell for GPRS/EDGE capability is enabled for the current TRX.– GENA

With this parameter you define whether the GPRS capability is enabled in the cell.– EGENA

Attribute enables or disables EGPRS on BTS level. All GPRS-enabled TRXs of the BTS have to be EDGE capable. The GPRS must be enabled in the segment in order to enable EGPRS in the BTS.

– CMAX Attribute defines the maximum number of timeslots in the PS territory. Timeslot that belongs to a PS territory can be configured to PS use or

DTM-CS use.




– GMANPRESPRM GPRS maximum Number of PDCH reserved Primary, this parameter defines the number of traffic channels

reserved for GPRS in the 'Primary Area'.

– EMANPRESPRM EGPRS maximum Number of PDCH reserved Primary, this parameter defines the number of traffic channels

reserved for EGPRS in the 'Primary Area'.

• BSS– CDEF

With this parameter you determine the default GPRS territory size in a cell. The channels in the default GPRS territory are used primarily for packet switched traffic. However, if the circuit switched territory becomes congested, the BSC can allocate a traffic channel in the default GPRS territory for circuit switched use.

– CDED With this parameter you determine the amount of PSW-only channels in a cell. The value of the dedicated GPRS

capacity parameter must be smaller than or equal to the value of the default GPRS capacity parameter.



BR Configuration assessment and BSS planning Channel types

BR Parameter BSS ParameterCHTYPEobject: CHANrange: 1 (TCHFULL), 2(SDCCH), 3(MAINBCCH),4(MBCCHC), 5(CCCH), 6 (SCBCH), 7(BCBCH), 8(TCHF_HLF), 9 (TCHSD)no defaultThis parameter - defines the logical channel combination mapped onto the physical channel (timeslot).

channel<n>Type (n: number of TSLS 0..7) object: TRXRange: TCHF (0), TCHH (1), TCHD (2), SDCCH (3), MBCCH (4), MBCCHC (5), MBCCB (7), Not allowed in CH0 (8), Not In Use (9), ERACH (10), Not allowed in CH0 (13), EGTCH (14), Not allowed in CH0 (15)default: TCHF (0)With this parameter you define the logical channel combination that has to be mapped onto the basic physical channel.

BR parameters mapped to BSS:



BR Configuration assessment and BSS planning Channel types - TCH

• FR, HR, EFR, AMR FR and AMR HR, WB AMR (GMSK codecs; without quality based homing) are supported

• If NB-AMR or WB-AMR conditions are met like in S14 BSC3i SW then a speech call with AMR HR/FR or WB-AMR FR codec is established according to wideband AMR and AMR TFO

– In BSS WB-AMR capability of TRX is indicated by existing TRX-specific parameter “BB Unit Supports EDGE” (bbUnitSupportsEdge)

• In GEMINI WB-AMR capability of BTSplus TRX is indicated by existing BBS TRX-specific parameter “BB Unit Supports EDGE” which is mapped from TRXMD



BR Configuration assessment and BSS planning Channel types (Dynamic SDCCH)

• No need to configure TCHSD channels anymore

• Static planning (according to the maximum SDCCH and TCH needs) has to be done so saving total required number of channels

• The configured TCH and SDCCH channels may be reconfigured dynamically by BSC according the actual traffic needs

• BSS “Dynamic SDCCH" is a feature in which timeslots are configured to work either as TCH/FR or SDCCH.

• The feature is available on both BR and BSS system

• In GEMINI BSS Dynamic SDCCH feature replaces BR Smooth Channel Modification feature

• The number of timeslots configured as Dynamic SDCCH plus the one SDCCH pure is however limited up to four due to memory and CPU load limitations in both BR and BSS

Technology

Day1 slot3 br radio configuration assessment and bss radio configurationv0.4