GSM INTRODUCTION

INTRODUCTIONIntroduction

Transmission Principles

GSM Services

GSM PLMN

Network Planning

Procedure

GSM Signaling

Radio Interface

Siemens Solution

ICM N templ-example.ppt

INTRODUCTIONIntroduction

Transmission Principles

GSM Services

GSM PLMN

Network Planning

Procedure

GSM Signaling

Radio Interface

Siemens Solution

re-use distancerSingle CellSystemCellularSystem

ICM N templ-example.ppt

INTRODUCTIONIntroduction

Transmission Principles

GSM Services

GSM PLMN

Network Planning

Procedure

GSM Signaling

Radio Interface

Siemens Solution

876880890GSM90091592192593596017101785180518501880191019301990[MHz]GSM900E-GSME-GSMGSM1800GSM1800GSM1900GSM-RGSM1900

TRANSMISSION PRINCIPLESIntroduction

Transmission Principles

GSM Services

GSM PLMN

Network Planning

Procedure

GSM Signaling

Radio Interface

Siemens Solution

frequency fDuplex distanceUL / DLseparated by frequency !

TRANSMISSION PRINCIPLESIntroduction

Transmission Principles

GSM Services

GSM PLMN

Network Planning

Procedure

GSM Signaling

Radio Interface

Siemens Solution

frequency ftime tpower TS 1TS 2TS 3TDMAfrequency ftime tpower 123FDMAPP

TRANSMISSION PRINCIPLES

TRANSMISSION PRINCIPLESf2f1f3f2f1f3f2f1f3f2f1f3f2f1f3

TRANSMISSION PRINCIPLESPCM30: TDMA Principletelephone channels 1 - 15telephone channels 17 - 31signaling channeltime slot

TS 0TS 1TS 2TS 3TS 4TS 5TS 6TS 70.577 ms0.577 ms0.577 ms0.577 ms0.577 ms0.577 ms0.577 ms0.577 ms4.6 ms

TS 0TS 1TS 2TS 3TS 4TS 5TS 6TS 70.577 ms0.577 ms0.577 ms0.577 ms0.577 ms0.577 ms0.577 ms0.577 ms4.6 ms

TS 0TS 1TS 2TS 3TS 4TS 5TS 6TS 70.577 ms0.577 ms0.577 ms0.577 ms0.577 ms0.577 ms0.577 ms0.577 ms4.6 ms

TS 0TS 1TS 2TS 3TS 4TS 5TS 6TS 70.577 ms0.577 ms0.577 ms0.577 ms0.577 ms0.577 ms0.577 ms0.577 ms4.6 ms

GSM SERVICESIntroduction

Transmission Principles

GSM Services

GSM PLMN

Network Planning

Procedure

GSM Signaling

Radio Interface

Siemens Solution

GSM PLMN GSM InterfaceTMSBTSBSCTRAUVLRACLMTLMTLMTOMC - BUmAbisAsubCBFGEDTTOAEIRMSCMSC

GSM PLMN - Base Station ControllerTRAUTRAUTRAUBSC BSS control Switched between TRAU BTS Radio Resource Management Collecting error messages in BSS Contact to OMC-B Database storage, SW of BSSAsubAbis

GSM PLMN - TRAUTRAU64 kbit/s64646464 kbit/s64646464 kbit/s64646464 kbit/s64646416161616BSC64 kbit/s64646416161616sub multiplexer speech compression: 64kbit/s 13 or 5.6 kbit/s + in band signaling data transmission:"64 kbit/s" 0.3 - 9.6 kbit/s + in band signaling signaling:transparentAsubA

GSM PLMN GSM Phase 2+GGSN: Gateway to PDNs Protocol conversion Routing / Traffic Management Screening / FilteringMobileDTESGSNServing GPRS Support NodeGGSNGateway GPRS Support NodeVMSC / VLR

GMSCHLRextensionPCUBSSChannel Codec Unit CCU:BTS-SW upgrade for newCoding Schemes CS-1... CS-4HLR Extension::GPRS subscriber data(GPRS Register GR)Packet Control Unit PCU: protocol conversion radio resource managementCCUSGSN: serves all GPRS-MS in SGSN area Routing / Traffic-Management Mobility Management functions, e.g. Location Update, Attach, Paging,.. storing Location information Security & Access Control collecting charging data signalling with HLR, EIR, GGSN, MSC,..GiGnGbGr

NETWORK PLANNINGIntroduction

Transmission Principles

GSM Services

GSM PLMN

Network Planning

Procedure

GSM Signaling

Radio Interface

Siemens Solution

Very first steps

Studying the topographical maps, the relative statistical relevant information, local regulations and laws, existing networks and numbering plans future expansion plans

Network Planning

evaluation of expected traffic density use of CAD network planning tool (Tornado)determination of suitable MSC, BSC, BTS sitesTransmission Planning

connection points to the PSTN possible leased lines frequencies available for microwave links

NETWORK PLANNINGIntroduction

Transmission Principles

GSM Services

GSM PLMN

Network Planning

Procedure

GSM Signaling

Radio Interface

Siemens Solution

Frequency re-use distance: avoid inter-channel interferences Cluster: smallest domain within which all frequency resource is used (GSM900: typ. 7/9 cells) Network planning: difficult

The Cellular Network / Principles of Network Planning

NETWORK PLANNING

NETWORK PLANNING

PROCEDURE Codes IdentitiesIntroduction

Transmission Principles

GSM Services

GSM PLMN

Network Planning

Procedure

GSM Signaling

Radio Interface

Siemens Solution

CGI

PROCEDURE Security FeaturesSecurity Features: Authentication Ciphering TMSI allocation IMEI checkIntroduction

Transmission Principles

GSM Services

GSM PLMN

Network Planning

Procedure

GSM Signaling

Radio Interface

Siemens Solution

PROCEDURE Authentication & CipheringIntroduction

Transmission Principles

GSM Services

GSM PLMN

Network Planning

Procedure

GSM Signaling

Radio Interface

Siemens Solution

PROCEDURE TMSI Allocation

PROCEDURE IMEI Check

PROCEDURE Location UpdateIntroduction

Transmission Principles

GSM Services

GSM PLMN

Network Planning

Procedure

GSM Signaling

Radio Interface

Siemens Solution

PROCEDURE Location Update

GSM SIGNALLINGIntroduction

Transmission Principles

GSM Services

GSM PLMN

Network Planning

Procedure

GSM Signaling

Radio Interface

Siemens Solution

GSM SIGNALLING

RADIO INTERFACE Layer 1Introduction

Transmission Principles

GSM Services

GSM PLMN

Network Planning

Procedure

GSM Signaling

Radio Interface

Siemens Solution

RADIO INTERFACE Logical Channel

Multiplexing of Logical Channels1 RACH slot: 1 channel request message of 1 subscriber 1 CCCH block (4 slots):- 1 paging message for 1...4 subscribers or - 1 access grant message for 1...2 subscribers

Channel Organization in a Cell TCH/F + FACCH/F + SACCH/FTCHFULLFCCH + SCH+ BCCH+ CCCH (AGCH + PCH + RACH)MAINBCCHFCCH + SCH + BCCH + CCCH + 4 (SDCCH + SACCH)MBCCHC8 (SDCCH + SACCH)SDCCHTCH/H (0) + FACCH/H (0) + SACCH/H (0) + TCH/H (1)TCHF_HLFFCCH + SCH + BCCH + CCCH + 3 (SDCCH + SACCH) + CBCHBCBCH7 (SDCCH + SACCH) + CBCHSCBCHBCCH + CCCHCCCH

Channel Organization in a Cell

Time organization for one TCH

Channel configurationIn a cell with 2 RFC there are more possibilities, depending on the used traffic model [SDCCH dimensioning], for example:

Example :

call attempts per subscriber per hour1.1time for MOC/MTC setup signaling3 sectime for Location Update5 secLocation Updates per subscriber per hour2.2

The SDCCH load per subscriber is calculated as follows: (1.1 * 3 sec + 2.2 * 5 sec) / 3600 sec = 0.004 Erl

Furthermore we have for the TCH: 25 mErlUsing 2 carrier channel configuration.We have four values SDCCH load per subscriber to be considered:

Assumptions: 25 mErl TCH Load per subscriber 4 mErl SDCCH load per subscriberExample for Channel Configuration Erlang Table

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