BSS Architecture Service Guideline B10

Site

Mobile Radio Division

Vélizy Originator(s)

A. Rezzoug

B10: BSS Architecture Service Guideline

E. Marza

Domain

: Network Architecture

Product

: GSM B10

Division

: Methods

Rubric

: GSM/GPRS/EDGE

Type

: Guidelines

Distribution codes Internal:

Pre-distribution: NE Velizy

NE Timisora

NE Portugal

NE Egypt

F. Colin

Cristian I. Inta

Pedro Henriques

Wessam Yanni

T. Plantier

E. Marza

Tiago Dias

M. Talayssat

João Frade

LM. Palumbo

Abstract: The aim of this document is to describe BSS architecture configuration rules & dimensioning processes in Alcatel release B10. It is recommended to be the guideline for RNE & TPM people who are involve in BSS architecture aspect. Key words: BTS, BSC, TC, MFS/GP(U), Abis, AterMUX, A, and Gb; B10 release

Appraisal and approval authorities

GSM TIS DD-MM-YY:

Signature:

Network Engineering DD-MM-YY:

DD-MM-YY:

Signature:

Florent Colin Signature:

All Alcatel system details given in this document are for your comfort only. The system information may not reflect the latest status of the equipment used in your project. Please consult in addition to this document the latest product descriptions! Alcatel File

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Table of contents 1

INTRODUCTION........................ INTRODUCTION........ ................................ ................................ ................................ ............................. ............. 14

2

OVERVIEW OVERV IEW OF BSS ARCH ARCHITECT ITECTURE URE SERVICES SERVICES .......... .................... .............. .... 15 2.1

WHAT IS THE BSS ARCHITECTURE ? ....................... .............................................. .............................................. ............................ ..... 15

2.1.1

BSS Network Elements Elements ....................... .............................................. .............................................. ....................................... ................ 15

2.1.2

BSS Interfaces ..................... ............................................ .............................................. .............................................. ............................... ........ 16

2.1.2.1 Um (air or radio) interface ..................... ............................................ .............................................. ............................... ........ 16 2.1.2.2 Abis interface ...................... ............................................. .............................................. .............................................. ........................... .... 16 2.1.2.3 AterMUX interface .................... ........................................... .............................................. ........................................... .................... 16 2.1.2.4 A interface ....................... .............................................. .............................................. .............................................. ............................... ........ 17 2.1.2.5 Gb interface ..................... ............................................ .............................................. .............................................. ............................... ........ 17 2.2

BSS A RCHITECTURE SERVICES ..................... ............................................ .............................................. ....................................... ................ 18

2.2.1

Scope ....................... .............................................. .............................................. .............................................. ........................................... .................... 18

2.2.2

Goal..................... Goal ............................................ .............................................. .............................................. .............................................. ......................... 18

2.2.3

Category...................... Category ............................................. .............................................. .............................................. ....................................... ................ 18

2.2.4

Process .................... ........................................... .............................................. .............................................. ........................................... .................... 19

2.2.4.1 Process for Network Architecture SETUP and EVOLUTION EVOLUTION.................... .................... 19 2.2.4.2 Process for Network Architecture ASSESSMENT ..................... ..................................... ................ 22 2.3

BSS A RCHITECTURE IMPACT – IN B10 .................... ............................................ ............................................... ........................... .... 25

2.3.1

Multiple CCCH ............................................................. .................................................................................... ................................... ............ 25

2.3.2

Gb over IP ....................... .............................................. .............................................. .............................................. ................................... ............ 26

2.3.3

Capacity Improvements.......................... Improvements................................................. .............................................. ................................... ............ 27

2.3.3.1 Optimized HR connectivity........................ connectivity............................................... .............................................. ........................... .... 28 2.3.3.2 HSL functionality functionality........................ ............................................... .............................................. .......................................... ................... 28

3

DETAILED DETA ILED BSS ARCH ARCHITECT ITECTURE URE PROCESS ......... .................. ................... ................ ...... 29 3.1

BTS .................... ........................................... .............................................. .............................................. .............................................. ................................... ............ 29

3.1.1

BTS Configuration.......................... Configuration................................................. .............................................. ........................................... .................... 29

3.1.1.1 Cell Configuration.................................. Configuration......................................................... .............................................. ............................... ........ 33 3.1.1.2 SDCCH Configuration ....................... .............................................. .............................................. ................................... ............ 34 3.1.2

Determination of BTS configuration configuration...................... ............................................. .......................................... ................... 36

3.1.3

Cell dimensioning................ dimensioning....................................... .............................................. .............................................. ............................... ........ 36

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Table of contents 1

INTRODUCTION........................ INTRODUCTION........ ................................ ................................ ................................ ............................. ............. 14

2

OVERVIEW OVERV IEW OF BSS ARCH ARCHITECT ITECTURE URE SERVICES SERVICES .......... .................... .............. .... 15 2.1

WHAT IS THE BSS ARCHITECTURE ? ....................... .............................................. .............................................. ............................ ..... 15

2.1.1

BSS Network Elements Elements ....................... .............................................. .............................................. ....................................... ................ 15

2.1.2

BSS Interfaces ..................... ............................................ .............................................. .............................................. ............................... ........ 16

2.1.2.1 Um (air or radio) interface ..................... ............................................ .............................................. ............................... ........ 16 2.1.2.2 Abis interface ...................... ............................................. .............................................. .............................................. ........................... .... 16 2.1.2.3 AterMUX interface .................... ........................................... .............................................. ........................................... .................... 16 2.1.2.4 A interface ....................... .............................................. .............................................. .............................................. ............................... ........ 17 2.1.2.5 Gb interface ..................... ............................................ .............................................. .............................................. ............................... ........ 17 2.2

BSS A RCHITECTURE SERVICES ..................... ............................................ .............................................. ....................................... ................ 18

2.2.1

Scope ....................... .............................................. .............................................. .............................................. ........................................... .................... 18

2.2.2

Goal..................... Goal ............................................ .............................................. .............................................. .............................................. ......................... 18

2.2.3

Category...................... Category ............................................. .............................................. .............................................. ....................................... ................ 18

2.2.4

Process .................... ........................................... .............................................. .............................................. ........................................... .................... 19

2.2.4.1 Process for Network Architecture SETUP and EVOLUTION EVOLUTION.................... .................... 19 2.2.4.2 Process for Network Architecture ASSESSMENT ..................... ..................................... ................ 22 2.3

BSS A RCHITECTURE IMPACT – IN B10 .................... ............................................ ............................................... ........................... .... 25

2.3.1

Multiple CCCH ............................................................. .................................................................................... ................................... ............ 25

2.3.2

Gb over IP ....................... .............................................. .............................................. .............................................. ................................... ............ 26

2.3.3

Capacity Improvements.......................... Improvements................................................. .............................................. ................................... ............ 27

2.3.3.1 Optimized HR connectivity........................ connectivity............................................... .............................................. ........................... .... 28 2.3.3.2 HSL functionality functionality........................ ............................................... .............................................. .......................................... ................... 28

3

DETAILED DETA ILED BSS ARCH ARCHITECT ITECTURE URE PROCESS ......... .................. ................... ................ ...... 29 3.1

BTS .................... ........................................... .............................................. .............................................. .............................................. ................................... ............ 29

3.1.1

BTS Configuration.......................... Configuration................................................. .............................................. ........................................... .................... 29

3.1.1.1 Cell Configuration.................................. Configuration......................................................... .............................................. ............................... ........ 33 3.1.1.2 SDCCH Configuration ....................... .............................................. .............................................. ................................... ............ 34 3.1.2

Determination of BTS configuration configuration...................... ............................................. .......................................... ................... 36

3.1.3

Cell dimensioning................ dimensioning....................................... .............................................. .............................................. ............................... ........ 36

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3.1.3.1 SDCCH Dimensioning Dimensioning....................... .............................................. .............................................. ................................... ............ 37 3.1.3.2 TCH/PDCH Dimensioning ....................... ............................................... ............................................... ........................... .... 39 3.2

ABIS I NTERFACE .................... ........................................... .............................................. .............................................. ....................................... ................ 45

3.2.1

Abis Configuration ...................... ............................................. .............................................. .............................................. ....................... 45

3.2.1.1 Abis Network Topology................................ Topology....................................................... .............................................. ......................... 45 3.2.1.2 Abis Channels ..................... ............................................ .............................................. .............................................. ........................... .... 47 3.2.1.3 Abis Link Capacity.............. Capacity..................................... .............................................. .............................................. ........................... .... 49 3.2.1.4 Signalling Sub-Multiplexing Schemes.................................. Schemes......................................................... ....................... 49 3.2.1.4.1

No Multiplexing............... ....................... .................... ....................... .................. ...................... 50

3.2.1.4.2

16K Static Multiplexing............................................................................................................. 50

3.2.1.4.3

64K Statistical Multiplexing ..................... ..................... ....................... .................. ................... 51

3.2.1.4.4

16K Statistical Multiplexing ..................... ..................... ....................... .................. ................... 54

3.2.1.5 Secondary Abis Link Link...................... ............................................. .............................................. ....................................... ................ 55 3.2.2

Abis Dimensioning ..................... ............................................ ............................................... ............................................... ....................... 57

3.2.2.1 Case #1: B9 with No GPRS/EDGE



B10 with EDGE EDGE..................... ............................. ........ 59

3.2.2.2 Case #2: B10 B10 with EDGE................... EDGE.......................................... .............................................. ................................... ............ 59 3.3

BSC ........................ ............................................... .............................................. .............................................. .............................................. ............................... ........ 66

3.3.1

G2 BSC Configuration Configuration ....................... .............................................. .............................................. ....................................... ................ 66

3.3.1.1 BSC Capacity ...................... ............................................. .............................................. .............................................. ........................... .... 67 3.3.1.2 Abis TSU........................................ TSU............................................................... .............................................. ....................................... ................ 68 3.3.1.3 Ater TSU ..................... ............................................ .............................................. .............................................. ................................... ............ 70 3.3.2

BSC Evolution Configuration................. Configuration........................................ ............................................... ................................... ........... 70

3.3.2.1 BSC Capacity ...................... ............................................. .............................................. .............................................. ........................... .... 72 3.3.2.2 Delta BSC Evolution versus G2 BSC ....................... .............................................. ................................... ............ 73 3.3.2.3 CCP board ....................... .............................................. .............................................. .............................................. ............................... ........ 73 3.3.2.4 LIU shelf ..................... ............................................ .............................................. .............................................. ................................... ............ 75 3.3.2.5 SS7 transport ....................... .............................................. .............................................. .............................................. ........................... .... 75 3.3.3

BSC Dimensioning ..................... ............................................ ............................................... ............................................... ....................... 76

3.3.3.1 Design BSC area .................... ........................................... .............................................. ............................................... ........................ 77 3.3.3.2 Parenting Abis ports of the BSC ....................... .............................................. ........................................... .................... 79 3.3.4

LA Dimensioning............................................... Dimensioning...................................................................... .............................................. ......................... 81

3.3.5

RA Dimensioning............................ Dimensioning................................................... .............................................. ........................................... .................... 85

3.3.6

Summary of LA/RA dimensioning process process .................... ........................................... ................................... ............ 87

3.3.7

CCCH dimensioning ......................................................... ................................................................................ ............................... ........ 88

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3.4

ATER MUX AND A INTERFACES .................................................................................. 89

3.4.1

General............................................................................................................. 89

3.4.1.1 AterMUX interface ...................................................................................... 89 3.4.1.2 A interface .................................................................................................... 89 3.4.1.3 AterMUX interface versus A interface ........................................................ 89 3.4.2

AterMUX configuration.................................................................................... 90

3.4.2.1 AterMUX CS and A interfaces .................................................................... 91 3.4.2.2 AterMUX PS ................................................................................................ 93 3.4.2.3 AterMUX CS/PS .......................................................................................... 94 3.4.3

SS7 Signalling mode......................................................................................... 96

3.4.3.1 LSL and HSL modes .................................................................................... 96 3.4.3.2 SS7 Dimensioning........................................................................................ 97 3.4.4

AterMUX Dimensioning................................................................................. 101

3.4.4.1 AterMUX CS.............................................................................................. 101 3.4.4.1.1

A Dimensioning....................................................................................................................... 104

3.4.4.2 AterMUX PS .............................................................................................. 105 3.4.4.2.1

Process description .................................................................................................................. 105

3.4.4.2.2

GSL Dimensioning ..................... .................... ....................... ........................ .................. ........ 108

3.4.4.2.3

GCH/AterMUX-PS Dimensioning .......................................................................................... 113

3.4.4.3 AterMUX CS/PS ........................................................................................ 115 3.5

TC............................................................................................................................. 116

3.5.1

G2 TC Configuration ..................................................................................... 117

3.5.2

G2.5 TC Configuration .................................................................................. 117

3.5.3

TC Dimensioning............................................................................................ 118

3.6

MFS.......................................................................................................................... 120

3.6.1

The 1st MFS generation (A9135 MFS) ........................................................... 120

3.6.1.1 GPRS Processing Unit (GPU).................................................................... 121 3.6.1.2 Multiple GPU per BSS............................................................................... 121 3.6.1.3 Capacity...................................................................................................... 122 3.6.2

MFS Evolution (A9130 MFS) ......................................................................... 122

3.6.2.1 Configurations and Capacity...................................................................... 123 3.6.2.2 Delta MFS Evolution versus the 1 st MFS generation................................. 124 3.6.3

GP(U) Dimensioning and AterMux PS dimensioning (user traffic) .............. 125

3.6.3.1 Required GCH traffic estimation in case of stable network....................... 128

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3.6.3.2 Required GCH estimation in anticipation of feature activation................. 130 3.6.3.2.1

Increase_factor estimation ..................... .................... ........................ .................. .................... 131

3.6.3.3 GP(U) GCH capacity estimation................................................................ 132 3.6.3.4 GP(U) limitations ....................................................................................... 134 3.7

4

GB INTERFACE .......................................................................................................... 138

3.7.1

Gb configuration ............................................................................................ 140

3.7.2

Gb Dimensioning............................................................................................ 142

ANNEX 1: BSS ARCHITECTURE IMPACT FROM B9.................. 145

5 ANNEX 2: PRE-REQUISITES FOR MXBSC CAPACITY IMPROVEMENTS ......................................................................................... 150 5.1

CIC

5.2

HSL

5.3

GBOIP LIMITATION ................................................................................................... 151

CODE LIMITATION LIMITATION

.............................................................................................. 150

...................................................................................................... 150

6

ANNEX 3: ABIS, ATER & GB OVER SATELLITE ......................... 153

7

ANNEX 4: TRANSPORT MIGRATION............................................. 154 7.1

OPTIMISATION OVER E1 ............................................................................................ 154

7.2

IP BACKHAULING ...................................................................................................... 154

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INDEX OF FIGURES Figure 1: BSS Architecture ...................................................................................................... 15 Figure 2: TRX configuration on Um interface ......................................................................... 16 Figure 3: Abis configuration .................................................................................................... 16 Figure 4: AterMUX configuration – Dedicated AterMUX for CS traffic ............................... 17 Figure 5: A-interface configuration.......................................................................................... 17 Figure 6: BSS Architecture Services........................................................................................ 18 Figure 7: Network Architecture Setup and Evolution process................................................. 19 Figure 8: BSC/LAC/RAC (re) design - example ..................................................................... 20 Figure 9: Abis TSU port (re) design......................................................................................... 22 Figure 10: Network architecture assessment process............................................................... 23 Figure 11: mCCCH mapping on Beacon TRX ........................................................................ 25 Figure 12: MFS capacity.......................................................................................................... 27 Figure 13: B10 BSC capacity improvements ........................................................................... 27 Figure 14: BSC - MSC connectivity with HSL mode.............................................................. 28 Figure 15: BTS generation/type – supported in B10................................................................ 29 Figure 16: Determination of BTS configuration ...................................................................... 36 Figure 17: SDCCH dimensioning process ............................................................................... 37 Figure 18: TCH/PDCH dimensioning process......................................................................... 40 Figure 19: TCH/PDCH dimensioning assessment ................................................................... 44 Figure 20: Abis Chain (Multi-drop) Topology ........................................................................ 45 Figure 21: Abis Star Topology................................................................................................. 46

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Figure 22: Abis Ring (Closed loop) Topology......................................................................... 46 Figure 23: Secondary Abis Topology ...................................................................................... 47 Figure 24: TRX - Abis mapping .............................................................................................. 47 Figure 25: Example of Abis TS usage for 1 BTS/4 TRX – No Multiplexing.......................... 50 Figure 26: Example of Abis TS usage for 1 BTS/4 TRX – 16K Static Multiplexing ............. 51 Figure 27: 64K Statistical Multiplexing – MCB 64/1 mapping............................................... 51 Figure 28: 64K Statistical Multiplexing – MCB 64/2 mapping............................................... 52 Figure 29: 64K Statistical Multiplexing – MCB 64/4 mapping............................................... 52 Figure 30: Example of Abis TS usage for 1 BTS/4 TRX – 64K Statistical Multiplexing....... 53 Figure 31: 16K Statistical Multiplexing – MCB 16/1 mapping............................................... 54 Figure 32: Example of Abis TS usage for 1 BTS/4 TRX – 16K Statistical Multiplexing....... 55 Figure 33: Abis TS configuration on primary and secondary links ......................................... 55 Figure 34: BTS with 24 TRX mapped on both Abis links....................................................... 56 Figure 35: Example of topology with two BTS chained .......................................................... 56 Figure 36: Two Abis links filling examples. ............................................................................ 57 Figure 37: Abis dimensioning process – Method 1.................................................................. 60 Figure 38: Abis dimensioning process – Method 2.................................................................. 63 Figure 39: Abis method algorithm ........................................................................................... 64 Figure 40: Abis dimensioning process ..................................................................................... 65 Figure 41: G2 BSC (A9120 BSC) Architecture ....................................................................... 66 Figure 42: G2 BSC Cabinet layout .......................................................................................... 67 Figure 43: Abis TSU – G2 BSC ............................................................................................... 68

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Figure 44: Ater TSU – G2 BSC ............................................................................................... 70 Figure 45: BSC Evolution (A9130 BSC) HW Architecture .................................................... 71 Figure 46: Abis and Ater allocation on LIU boards / BSC capacity........................................ 75 Figure 47: BSC dimensioning process ..................................................................................... 76 Figure 48: BTS position & configuration – design BSC area step 1 ....................................... 77 Figure 49: Transmission planning & BSC position – design BSC area step 2 ........................ 78 Figure 50: BSC area definition – design BSC area step 3 ....................................................... 78 Figure 51: Transmission load checking ................................................................................... 79 Figure 52: BTS / Abis parenting on BSC – done by AMT.NET ............................................. 80 Figure 53: LA dimensioning assessment ................................................................................. 84 Figure 54: Subdivision of a LA in GPRS routing areas (RA).................................................. 85 Figure 55: AterMUX and A relationship ................................................................................. 89 Figure 56: AterMUX interface structure .................................................................................. 90 Figure 57: AterMUX CS interface configuration – G2 BSC ................................................... 91 Figure 58: Channel mapping between AterMUX CS and A.................................................... 92 Figure 59: AterMUX PS interface configuration - GPU.......................................................... 93 Figure 60: Sharing AterMUX links.......................................................................................... 94 Figure 61: AterMUX CS/PS Timeslot configuration............................................................... 95 Figure 62: SS7 message length (in bytes) according to GSM event........................................ 97 Figure 63: Difference between Exact busy hour, NPO busy hour and Peak traffic................. 99 Figure 64: AterMUX-CS dimensioning process.................................................................... 102 Figure 65 AterMux-PS dimensioning process at BSC level .................................................. 106

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BSS Architecture Service Guideline B10

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