GSM Equipment

7/30/2019 GSM Equipment

1/38

GLOBAL SYSTEM OF MOBILE

COMMUNICATIONS (GSM)


2/38

NETWORK ARCHITECTURE

MSC/VLR

HLR/AUC EIR SC/VM

OMC

BSC

BTS

PSTNISDN

PSPDN

MS

BSS

MSS

Um

Abis

BIE

A

F

C

H

MSC/VLR

E


3/38

GSM900 :

up: 890~915MHz

down: 935~960MHz

duplex interval: 45MHz

bandwidth: 25MHz

frequency interval: 200KHz

GSM1800 :

up: 1710-1785MHz

down: 1805-1880MHz

duplex interval: 95MHz working

bandwidth: 75MHz


EGSM900 :

up: 880~890MHz

down: 925~935MHz


bandwidth: 10MHz


GSM1900MHz:

up:1850~1910MHz

down:1930~1990MHz


working bandwidth: 60MHz


Allocated GSM Frequency Bands


4/38

GSM ENTITIES

VLR dynamically stores subscriber information needed to handleincoming/outgoing calls

Manages the mobile subscribers databaseHLR

holds all the switching functions manages thenecessary radio resourcesMSC

AUC/EIRAuthentication Center(s) (AUC)Handling Mobile Station Equipment Identity

Equipment used by mobile service subscribers foraccess to services.

MS


5/38

INTERFACES

MS

Ater interface

Um interface

BSC

BIE

BTS

BIE

Abisinterface

SM SM TC

A interface

MSC

OMC

Q3 interface

Fig.1-3 BSS Structure


6/38

Voice conversion

16kbit/s RPE-LTP 64kbit/s A-law PCM codes.Typically TC is located between MSC and BSC.

TRAU


7/38

Managing Wireless network-BSS

Monitoring BTS

Controls:Wireless link distribution between MS and BTS

Communication connection and disconnection

MS location, handover and paging

Voice encoding, transecoding (TC), rate, adaptation,

The operation and maintenance functions of BSS.

BSC

Base Station Controller


8/38


9/38

channel

TCH

CCH

Voice CH

Data CH

FR Voice Traffic Channel (TCH/FS)

HR Traffic Channel (TCH/HS)

4.8Kbit/s HR TCH (TCH/H4.8)

9.6Kbit/s FR TCH(TCH/F9.6)

4.8Kbit/s FR TCH (TCH/F4.8)

BCH

FCCH (down)

SCH (down)

BCCH (down)

CCCH

RACH (up)

AGCH (down)

PCH (down)

DCCH

SDCCH

FACCHSACCH

14.4Kbit/s FR TCH (TCH/F14.4)

Enhanced FR Traffic Channel (TCH/EFR)

CHANNEL SPECIFICATIONS


10/38

Small capacity cell with only 1 TRX

TN0:FCCH+SCH+CCCH+BCCH+SDCCH/4(0,_,3)+SACCH/C4(0,_,3);

TN1-7: TCH/F+FACCH/F+SACCH/TF

The medium-size cell with 4 TRXs

1TN0 group: FCCH+SCH+BCCH+CCCH;2 SDCCH/8(0,_,7)+SACCH/C8(0,_,7);

29 TCH/F+FACCH/F+SACCH/TF

Channel Combinations


11/38

Cell Mode Layout

O

Omni-directional cell

Adopt omni-directional antenna

the overall directional propagation

characteristic is the same.

Directional cell

In general, cell with multi-sector is in

common use. Every directional cell

adopts directional antenna.


12/38

Traffic Measurements

Erlang :

the traffic intensity of a totally occupied channel (i.e.the call hour of a unit hour or the call minute of a unit

minute). For example, the traffic of a channel occupied

for 30 minutes in an hour is 0.5 Erlang)

GOS:

defined as the probability of call blocking or the

probability when the call delay time is longer than a

given queuing time.


13/38

Frequency Hopping

Reason:

counteract Rayleigh Fading scatter interference among multiple calls

Types:

Base band frequency hopping

keeps the transmission and receiving frequency of each carrier unitunchanged, but merely sends FU transmission data to different carrier

units at different FN moments.

radio frequency hopping

controls the frequency synthesizer of each transceiver, making it hop

according to different schemes in different time slots.


14/38

The multi-path propagation of radio signals causes

magnitude fading and delay time.

Space Diversity (antenna diversity)

Polarization Diversity

orthogonal polarization diversity.

horizontal polarization and vertical polarization.

Frequency Diversity

The working principle of this technology is that such

fading wont take place on the frequency outside the

coherence bandwidth of the channel.

Diversity ion Technology


15/38

Frequency Reuse Pattern

4 3 reuse mode:one group includes 3 sectors /site ,12 frequency which are

distributed to 4 sites. Every site owns 3 frequency.

A3

D2B1

C3

B2D1

D3

A2C1

B3

C2A1

B3

C2A1

A3

A1B1

D1

D3D2

C3

B2A1

C3D2

C3

C1

D2B1C2A1

A2C1

D3


16/38

Frequency Reuse Pattern

A3

C2B1

B3

A2C1

C3

B2A1

A3

C2B1

B3

A2C1

B3

A1C1

A1

A3A2

C3

B2A1

A3A3

C3

C1

B2A1B2A1

A2C1

B3

3 3 reuse mode:one group includes 3 sectors /site ,9 frequency which are

distributed to 3 sites. Every site owns 3 frequency.


17/38

GSM EQUIPMENT

ZXG10 BSS


18/38

GSN MSC

BSCSCM

RMM#1 RMM#2... ...

OMC

BTS 1 BTS n BTS 1 BTS n.. ...

...

Gb ATCP/IPX.25DDN

Abis

RMM#4

SCM: System control Module

RMM: Radio Resource Management Module

Each Module of BSC can manage 128

Cells/256 TRXs, and each BSC consists of 4modules maximally, so one BSC can manage

1024 TRXs maximally.

Structure of ZXG10-BSC


19/38

Advantage:

1Support small capacity network

2Large capacity network can be constructed in phases

Ntrx < 240 1 rack 1 SCM+ 1 RMM

240 < Ntrx < 480 2 racks1 SCM + 2 RMM



Capacity Configuration of ZXG10-BSC


20/38

Rack Structure

BBIU

BCTL-SCU

BNET

BATC

BCTL-RMU

BATC

BCTL

BNET

BATC

BBIU

BSMU

PCU


21/38

1 3 54 6 87 9 1110 12 1413 15 1716 18 2019 21 2322 24 26252 27

P

O

W

B

M

P

M

P

S

M

E

M

C

O

M

M

C

O

M

M

C

O

M

M

C

O

M

M

C

O

M

M

C

O

M

M

C

O

M

M

C

O

M

M

C

O

M

M

C

O

M

M

C

O

M

M

C

O

M

M

P

E

P

D

M

O

N

P

O

W

B

MMOOOptionalMMandatoryRemark

12116~1221Qty.

BCTLPOWBMONPEPDCOMMMPSMEM

BBIU

BCTL-SCU

BNET

BATC

BCTL-RMU

BATC

N_COMM_MPMP=2

N_COMM_MTP=2

N_COMM_MPPP=2 or 4 or 6 or 8

So: N_COMM=6 or 8 or 10 or 12

BCTL Layer


22/38

BNET Layer

P

O

W

B

C

K

I

B

O

S

N

D

S

N

I

D

S

N

I

D

S

N

I

D

S

N

I

D

S

N

I

D

S

N

I

D

S

N

I

D

S

N

I

D

S

N

I

D

S

N

I

P

O

W

B

S

Y

C

K

S

Y

C

K

B

O

S

N

1 3 54 6 87 9 1110 12 1413 15 1716 18 2019 21 2322 24 26252 27

BOSN SYCK DSNI CKI POWB BNET

Qty. 2 2 6\8\10 1 2 1

Remark Mandatory M Optional O M M

BBIU

BCTL-SCU

BNET

BATC

BCTL-RMU

BATC

N_DSNI_MP=2

N_DSNI_PP_A=2 or 4

N_DSNI_PP_Abis=2 or 4

SO: N_DSNI=6 or 8 or 10


23/38

BBIU Layer

P

O

W

B

B

I

P

P

B

I

P

P

C

O

M

I

C

O

M

I

B

I

P

P

B

I

P

P

T

I

C

T

I

C

T

I

C

T

I

C

P

O

W

B

T

I

C

1 3 54 6 87 9 1110 12 1413 15 1716 18 2019 21 2322 24 26252 27

T

I

C

T

I

C

T

I

C

T

I

C

T

I

C

T

I

C

T

I

C

BBIU

BCTL-SCU

BNET

BATC

BCTL-RMU

BATC

COMI BIPP TIC POWB BBIU

Qty. 2 2 or 4 1~12 2 1

Remark Mandatory Optional Optional M M

N_TIC_Abis=N_Abis_E1/4

N_BIPP=N_TIC_Abis/6


24/38

BATC Layer

P

O

W

B

D

R

T

A

I

P

P

A

I

P

P

T

I

C

T

I

C

T

I

C

T

I

C

T

I

C

T

I

C

P

O

W

B

T

C

P

P

1 3 54 6 87 9 1110 12 1413 15 1716 18 2019 21 2322 24 26252 27

D

R

T

D

R

T

D

R

T

D

R

T

D

R

T

T

I

C

T

I

C

T

C

P

P

D

R

T

D

R

T

BBIU

BCTL-SCU

BNET

BATC

BCTL-RMU

BATC

TCPP DRT AIPP TIC POWB BATC

Qty. 2 1~8 2 1~8 2 1

Remark Mandatory Optional M O M M

N_TIC_A=N_A_E1/4

N_DRT_A=N_TIC_A


25/38

1 RACK

256TRX

2 RACKS

512TRX

3 RACKS

1024TRX

Easy to Expand


26/38

ZTE BTS Series

BTSV(1)

BTSV(2) BS21

MB

EMB SBTS

BS30


27/38

S222 S444 S888

S444 S888 S12/12/12

ZXG10-BTS Rack


28/38

Receiver sensitivity: -110dBm

Power output: 40/80W

BTS power control

6 levels staticstep: 2dB

15 levels dynamicstep: 2dB

Rack demension: 1600600550 mm3 (H x W x D)

Max power consumption: 2200W12 TRXs

DC voltage input: -40~-57VDC 19~29VDC

Working temperature: -5oC ~ +45oC

Relative humidity: 15% ~ 85%

Indoor BTS with 12 TRX(ZXG10-BTSV2)


29/38

Z T E Z X G 1 0 - B 2

-48V GND

PDM

CCM

RST

TRM

TX

RX

RXDRST

CCM

RST

RX1

CDU

T E S T

AN T

TX 1TX 2

RX2

RX3

RX4

EX1

EX2

TRM

TX

RX

RXDRST

TRM

TX

RX

RXDRST

TRM

TX

RX

RXDRST

RX1

CEUTX 1

TX 2

RX2

RX3

RX4

EX1

EX2

O T X 1

TX 3

TX 4

O T X 2

RX1

CDU

T E S T

AN T

TX 1TX 2

RX2

RX3

RX4

EX1

EX2

RX1

CEUTX 1

TX 2

RX2

RX3

RX4

EX1

EX2

O T X 1

TX 3

TX 4

O T X 2

TRM

TX

RX

RXDRST

TRM

TX

RX

RXDRST

TRM

TX

RX

RXDRST

TRM

TX

RX

RXDRST

RX1

CDU

T E S T

AN T

TX 1TX 2

RX2

RX3

RX4

EX1

EX2

TRM

TX

RX

RXDRST

TRM

TX

RX

RXDRST

TRM

TX

RX

RXDRST

TRM

TX

RX

RXDRST

RX1

CDU

T E S T

AN T

TX 1TX 2

RX2

RX3

RX4

EX1

EX2

PDM CMM

AEMTRM

FCM

Physical structure of ZXG10-BTS(V2)


30/38

Architecture of ZXG10-BTS(V2)

Internal bus(control signaling,date flow,clock signal,etc

CMM

PDM

TRM1

AE

M

FAN

MMIZXG10-BTSV2

TRM2

TRM12

BSC


31/38

CDUTX1 TX2 RX1 RX2 RX3 RX4 ERX1 ERX2

CDUTX1 TX2 RX1 RX2 RX3 RX4 ERX1 ERX2

TRM1

TX RX1 RX2

TRM2

TX RX1 RX2

TRM3

TX RX1 RX2

TRM4

TX RX1 RX2

S444

TRX Configuration


32/38

CMM(Controller &

Maintenance

Module)

TRM(Transceiver

Module )

CMM and TRM


33/38

CDU(Combiner Distribution Unit ):

one duplexer

one combiner(2 to 1)

one spliter(1 to 4 with 2 extended outputs )

CDU

VSWR_meter

ANT

RTE

forward reverse

Alarms

optional

DuplexerCable

Cable

Rx_in

Tx_out

RX1

RX2RX3

RX4

EX1

EX2

LNA_Splitter

Alarms

TX1

TX250ohm

Hybird_combiner


34/38

Each E1(2M) on Abis interface can support 15 TRX, So it can

effectively save the transmission cost.

7.2*16k TCH timeslot / TRX = 1.8*64k TCH timeslot / TRX

1*16k signaling timeslot / TRX

Since very 4 16k timeslot can be multiplexed to a 64k timeslot,

each E1 consists of 32 64k timeslot

( n + 1 ) / 4 + n * 1.8 + 1 = 32 n = 15

Multiplex ratio on Abis interface is 15:1


35/38

OMC-R

The adoption of OMC aims at the local or centralized operation

and management. So network mode of OMC-R includes two: local

networking and centralized networking. They will be introduced indetail later.

OMC enables NSS/BSS to connect with upper-level mobile

network management center through Q3 interface or DB interface.

BTS is managed and maintained by BSC. The local BSC

communicates with the server over LAN, and the remote BSCaccesses the OMC-R server through centralized networking. The

network topology of OMC-R is given in this Fig.

One OMC-R can manage 10 MSC, 16 BSC, 4096 BTS


36/38

Upper-level NMC

TCP/IP

TCP/IP

TCP/IP

Billing Center

PCM/X.25/DDN...ZXG10-BSC

ZXG10-BSC

ZXG10-MSSClient

Client

Client

Client

Q3 DB

OMC

LAN/WAN...

Server

Router

Router

Hub

Hub

Hub

OMC-R Structure


37/38


38/38

ThankYou

GSM Equipment

Documents

Transcript of GSM Equipment