3 G Arch & Various Relesas

8/10/2019 3 G Arch & Various Relesas

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3 G Architecture& Various releases

BY J.K.BACHANI

S.D.E (GSM)

BRBRAITT JABALPUR


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The

Mainly all the telecom network can be divided into

three parts.

1. UE ( User Equipment) such POT,EPBT in landline,

Mobile in a Mobile network, terminal in wirelessdata communication.

2. AN ( access network) such as cable in landline,

and frequency with type of access in wireless

communication.

3. CN ( Core Network):- It consist of the switching &

control equipment for the network.


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Brief Architecture of UMTS

Network

User Equipment

(UE)

Access Network

(AN)

Core Network

(CN)


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Network

As network changes theses entities

has to be changed accordingly.

In a UMTS network all the threeelement has to be changed as old

2G or 2.5 G equipments will not

work.


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Network

As access type is changed to WCDAM

the old BTS & UE will not work as they

are based on TDMA, GMSK Modulation& circuit switched data.

Now the UE should be capable of

handling packet sort of data & shouldsupport the IP for data communication.


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Network

As access type is changed the access

network has to be changed.

Now the Base station & Base Controllershould support soft handovers & spreading

which is used in WCDMA.

Now the base station is named as Node B &

Base Controller named as RNC ( RadioNetwork Controller)


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Network

Core Network does not required significant

changes as it is all ready migrated to packet

domain in 2.5 G (SGSN & GGSN are packet

switches & routers).

But as UMTS goes to R4 to R6 the

architecture is shifted to NGN or all IP based

system in that case core network has to bechanged and new entities like MGW &

MGWC is to be used.


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Various releases & difference

in them-3GPP

Node B

Node B

Node B

N M S

R N S C N

SGSN

RNC

HLR

MSC

BSS

BSS

GGSN

GN

RNC

lur

lub

lu-cs

lu-ps

lu-cs

lu-ps

lub

UE

UE

EE

Uu

Uu

PSTN

Internet

A


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in them-3GPP R99


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in them

In R99 the only difference is UTRAN ( UMTS

terrestrial Radio access network.

Only access type is changed to WCDMA.

To do that BTS is replaced by Node B & BSC

is replaced by RNS.

In 2G network there is no interconnection

between BSC & BSC. But now two RNCs are

connected to support the soft handover.


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in them-3GPP R4


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in them-3GPP R4

In R4 the major changes has been done in

the core network to support the NGN

architecture.

To do so MGW & MGCF has been deployed.


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in them-3GPP R5


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in them-3GPP R5 & further

In R5 and above most of the stress is givenon IP.

Whole of the network is integrated using IP

backbone. For IP domain IMS has been deployed & for

connecting voice network to IP SIP,SIGTRAN, MEGACO protocols has been

used. New hardware such as CSCF,MGCF,MGW

are use


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in them-3GPP R5

CSCF- (Call Session Control Function)- It will

provide the SIP functionality in the IP domain.

Three types of CSCF

1. Proxy CSCF: The first contact point for the UEwithin the IP

2. Interrogating CSCF: The contact point for all

IP(IMS) connection to a subscriber within an

operators network.

3. Serving CSCF: This CSCF actually handles the

session signaling in the IP


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in them-3GPP R5

MGCF-Media Gateway Control function: The

MGCF communicates with serving CSCF

over SIP and with MGW using the MEGACO

protocol.

MEGACO is used by MGCF to establish the

bearer connection through MGW

One MGCF manages one or more MGWs.


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in them-3GPP R5

MGW- The primary function of MGW is to

convert media from one format to another.

The conversion usually take place between

the IP-based packet format to PCM-basedvoice format and vice versa.

The MGW interact with MGCF using

MAGACO or ISUP


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in them-3GPP R5

SGW: Signaling Gateway :-The SGW carries

out the signaling conversion.

i.e. between sigtran , SCTP ( Stream Control

Transmission Protocol)/IP and SS7/MTP

But it does not interpret the application layer

e.g MAP,CAP,ISUP

But it may interpret SCCP or SCTP layer gor

proper routing of the massage.


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in them-3GPP R5

Instead of MSC MSC server has been used

as it has to open the session with MGW over

the IP domain.

The HLR is also converted to HSS to support

the SIGTRAN as IP has to do signaling with

HLR prior to the call establishment.


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in them-3GPP R5

Difference in authentication parameters.

In 2G network 3 authentication parameters

were use namely RAND, SRES,Kc.

In 3 G network 4 authentication parameters

were use namely RAND, SRES, Kc, Integrity

Key.


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V i b & t d i 2G &


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Various number & terms used in 2G &

UMTS Network

IMSI ( E212)

MSISDN (E164)

TMSI

LA

LAI

RA

RAI MSRN

PDP Address


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Various interfaces


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Various interfaces


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Various interfaces


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Various interfaces


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Various interfaces


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Call flow in 2G & 3G Network

Call flow of 2G


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Call flow in 2G & 3G Network


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THANK YOU

Documents

3 G Arch & Various Relesas