metamorphosis teknologi transmisi pada industri selular

Oleh :Hary Johari Mansur

hary.j.mansur@gmail.com

GSM Transmission Networks

RAN◦ GERAN

◦ UTRAN

IP RAN◦ Packet Abis dan A over IP

◦ 3G Native IP

◦ LTE RAN

GSM Architecture & Interfaces

BSC

HLR/AC/EIRTCSM

MSC/VLR

BTS

AbisInterface

AterInterface

AInterface

AirInterface

TC

Ater’Interface

Air interface OPEN• 13 kb/s traffic channels• 8 channels / TRX• some channels reserved for signalling• blocking

Ater interface PROPRIETARY• 16 kb/s traffic channels• up to 120 traffic channels / 2M frame• 64 kb/s CCS#7 signalling• 64 kb/s channels for X.25 NMS connection• blocking

Abis interface PROPRIETARY• 13 kb/s traffic channels• up to 96 traffic channels / 2M frame• one TRXSIG signalling channel / TRX• one BCFSIG signalling channel / BTS• 16, 32 or 64 kb/s signalling rates

A interface OPEN• 64 kb/s traffic channels• 30 traffic channels / 2M frame• 64 kb/s CCS#7 signalling• 64 kb/s channels for X.25 NMS connection

GENERAL RULE for TS allocation0 : Synchronization1 - 24 : TCH25 - 30 : TRX/BCF SIG31 : Loop control

Max 12 TRX per 2 Mbit frame

Abis

Interface

Air

Interface

BSCMSC

A

InterfaceAter’

Interface

TC SM

Ater

Interface

BTS2

BTS1

bits 1 2 3 4 5 6 7 8

TS

0 Synchronisation

1 BTS 1

2 TRX 1

3 BTS 1

4 TRX 2

5 BTS 1

6 TRX 3

7 BTS 2

8 TRX 1

9 BTS 2

10 TRX 2

11 BTS 2

12 TRX 3

13 BTS 3

14 TRX 1

15 BTS 3

16 TRX 2

17 BTS 3

18 TRX 3

19 BTS 3

20 TRX 4

21 BTS 3

22 TRX 5

23 BTS 3

24 TRX 6

25 BTS 1 TRX 1 SIG BTS 1 BCF SIG BTS 1 TRX 2 SIG

26 BTS 1 TRX 3 SIG BTS 2 TRX 1 SIG BTS 2 BCF SIG

27 BTS 2 TRX 2 SIG BTS 2 TRX 3 SIG

28 BTS 3 TRX 1 SIG BTS 3 BCF SIG BTS 3 TRX 2 SIG

29 BTS 3 TRX 3 SIG BTS 3 TRX 4 SIG

30 BTS 3 TRX 5 SIG BTS 3 TRX 6 SIG

31 Loop bits / LCB / MCB

BTS 11+1+1

BTS 21+1+1

BTS 32+2+2

Transmission equipment to branch data streams between different link sets

Non-blocking stage◦ Each input stream is routed to an output stream

Tasks◦ Switching between link sets

◦ Switching between timeslots of a PCM trunk

◦ Dropping & inserting timeslots

3 x 2 Mbit/slinks

64 kbit/schannels

1 x 2 Mbit/slink

n

m

k

i < n+m+k

BSC

Total Traffic (Erl)Blocking Prob.

i = number of channels

Cross-ConnectsConcentration

full 2 Mbit/s frames

BSC

not full 2 Mbit/s frames

Cross-ConnectsGrooming

Secara fungsi RAN dibagi menjadi 3 jenis◦ GERAN (GSM EDGE Radio Access Network)

Jaringan Akses untuk GSM

◦ UTRAN (UMTS Teresterial Radio Access Network

Jaringan Akses untuk UMTS/WCDMA/3G

◦ E-UTRAN

Jaringan Akses untuk LTE/4G

GSM EDGE RADIO ACCESS NETWORK

◦ How Multiple E1 or T1 interfaces effectively provide a “virtual

common bandwidth” using MLPPP

IP layer on top of ML/Multi Class PPP (MCPPP) and HDLC over TDM (E1/T1)

TDM

TDMTDM Network

MLPPP

Packet Abis

E1/T1/FB

MLPPP

Packet Abis

E1/T1/SDHFlexiEDGE

BSC

◦ How

L1 connectivity: options to bring Ethernet to the BTS sites are: to use DSL connection to use Ethernet MW Radio for last mile to use fiber connection

BSC

Eth

EthPacket Switched Network

UDP/ IP

Packet Abis

Ethernet

UDP/ IP

Packet Abis

EthernetBTS

BSC Site router with Layer 2 (Ethernet) and optional Layer 3 (IP) functionality required for packet network based configurations for following purposes:

◦ Aggregation of site connectivity

◦ Flexible IP address planning and network configuration

◦ Router equipment redundancy based on Hot Standby Router Protocol (HSRP)

IP Backbone Network

2G BTS MGW

SGSN

HSRP

2G BTS

Virtual RouterRedundancy

BSC

A o IP

Gb o IP

Packet Abis

RG20

UMTS RADIO ACCESS NETWORK

Transport dari Node B ke RNC menggunakan 2 Teknologi transport ATM danEthernet

IuB yang menggunakan ATM biasanya digunakan untuk layanan circuit switching (voice,sms,mms)

IuB yang menggunakan tekhnologi ethernet digunakan untuk Data

Leased line domain

RNC

STM1

NBE1/T1

Eth

Ethernet

ATM(TDM Network)

Router

ATM Aggregator

Menggunakan teknologi ATM untuk interface IuB

Layanan suara dan data menggunakanteknologi ATM, dipisahkan dengan virtual path (VP) yang berbeda

RNCNB

Eth

TDM Transmission

ATMAggregator

Semua transport sudah menggunakanteknologi IP Transport

Semua layanan baik suara maupun data menggunakan teknologi packet switching

RNCNB

Eth

Ethernet

IP Router

EVOLVED RADIO ACCESS NETWORK