rab nawaz jadoon nawaz jadoon assistant professor comsats iit, abbottabad pakistan mobile...

Department of Computer Science

DCS

COMSATS Institute of

Information Technology

Cellular Systems - II

Rab Nawaz JadoonAssistant Professor

COMSATS IIT, Abbottabad

Pakistan

Mobile Communication


UMTS Architecture

▲ A UMTS network consist of three interacting domains;

Core Network (CN)

UMTS Terrestrial Radio Access Network (UTRAN)

User Equipment (UE)

The main function of the core network is to provide switching, routing and transit for user traffic.

Core network also contains the databases and network management functions.

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Cont…

▲ The basic Core Network architecture for UMTS is based on GSM network with GPRS.

All equipment has to be modified for UMTS operation and services.

The UTRAN provides the air interface access method for User Equipment.

Base Station is referred as Node-B

Control Equipment for Node-B's is called Radio Network Controller (RNC).

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Cont…

▲ Here is the list of system areas from largest to smallest.

UMTS systems (including satellite)

Public Land Mobile Network (PLMN)

MSC/VLR or SGSN

Location Area

Routing Area (PS domain)

UTRAN Registration Area

(PS domain)Cell

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Conceptual Network Model (UMTS)

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Cont…

▲ RNS (Radio Network Subsystem)

UTRAN

Node B

RNC

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Node B

RNC


What is UTRAN???

▲ The UMTS Terrestrial Radio Access Network (UTRAN) is the fixed network infrastructure that contains the facilities for the transmission to and from the mobile users over radio.

The components of the UTRAN are the,

Base stations, which are called Node B in UMTS, and

Control nodes, which are called Radio Network Controller (RNC). The Radio Network Controllers are connected to the Core Network

(CN).

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UTRAN

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Node B

▲ The functions of Node B are,

Air interface Transmission / Reception

Modulation / Demodulation

CDMA Physical Channel coding

Micro Diversity

Error Handing

Closed loop power control

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Node B

▲ An important task of a node B is the inner loop power control to mitigate near-far effects.

▲ This node also measures connection qualities and signal strengths.

▲ A node B can even support a special case of handover, a so-called softer handover which takes place between different antennas of the same node B.

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RNC --- Radio Network Controller

▲ The functions of RNC are:

Radio Resource Control

Admission Control

Channel Allocation

Power Control Settings

Handover Control

Macro Diversity

Ciphering

Segmentation / Reassembly

Broadcast Signaling

Open Loop Power Control

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Micro Diversity --- Soft Handover

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Macro Diversity --- Soft Handover

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E-RAN

▲ GERAN without GSM is ERAN.

▲ A GERAN without EDGE is a GRAN

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3GPP-R99 Architecture

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UMTS Core Network--- Overview

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UMTS core network together with a 3G RNS and a 2G BSS


UMTS Core Network--- Overview

▲ The circuit switched domain (CSD)

comprises the classical circuit switched services including signaling.

Resources are reserved at connection setup and the GSM components MSC, GMSC, and VLR are used.

The CSD connects to the RNS via a part of the Iu

interface called IuCS.

The CSD components can still be part of a classical GSM network connected to a BSS but need additional functionalities (new protocols etc.)

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Cont…

▲ The packet switched domain (PSD)

uses the GPRS components SGSN and GGSN and connects to the RNS via the IuPS part of the Iu

interface.

Both domains need the data-bases EIR for equipment identification and HLR for location management (including the AuC for authentication and GR for user specific GPRS data).

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Real Motivation

▲ Reusing the existing infrastructure helps to save a lot of money and may convince many operators to use UMTS if they already use GSM.

The UMTS industry pushes their technology with the help of the market dominance of GSM.

This is basically the same as cdma2000, which is a evolution of cdmaOne.

The real flexible core network comes with releases 5 and 6, where the GSM circuit switched part is being replaced by an all-IP core.

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Release 4

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Originally called the Release 2000 - added features including an all-IP Core Network


Release 5

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Introduced IMS and HSDPA


3GPP - Release 5

▲ HSDPA (High-Speed Downlink Packet Access)

HSDPA is a packet-based mobile telephony protocol used in 3G UMTS radio networks to increase data capacity and speed up transfer rates.

HSDPA, which evolved from the WCDMA standard, provides download speeds at least five times faster than earlier versions of UMTS.

HSPDA specifies data transfer speeds of up to 14.4 Mbps per cell for downloads and

2 Mbps per cell for uploads.

As of 2013 HSDPA deployments can support down-link speeds of up to 99.3 Mbps

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3GPP – Release 6▲ HSUPA and MBMS

High-Speed Uplink Packet Access (HSUPA) is a 3G mobile telephony protocol in the HSPA family with up-link speeds up to 5.76 Mbit/s.

The name HSUPA was created by Nokia.

The official 3GPP name for 'HSUPA' is Enhanced Uplink (EUL).

▲ MBMS

Multimedia Broadcast Multicast services (MBMS) is a point-to-multipoint interface specification

which is designed to provide efficient delivery of broadcast and multicast services, both within a cell as well as within the core network, for Example Mobile TV

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3GPP – Release 7

▲ HSPA +, MIMO (HOM etc)

HSPA+, or Evolved High-Speed Packet Access, is a technical standard for wireless, broadband telecommunication.

HSPA+ provides an evolution of High Speed Packet Access and provides data rates up to 168 Mbps for downlink and

22 Mbps from the mobile device (uplink).

Technically these are achieved through the use of a multiple-antenna technique known as MIMO (for "multiple-input and multiple-output“).

Dual Cell HSDPA (DC-HSDPA), known also as Dual Carrier, is the natural evolution of HSPA by means of carrier aggregation in the downlink.

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Comparison(R99, R4, R5)

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Department of Computer Science 26

rab nawaz jadoon nawaz jadoon assistant professor comsats iit, abbottabad pakistan mobile...

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