A Bimodal Architecture Using Unlicensed Band by Developing

8/6/2019 A Bimodal Architecture Using Unlicensed Band by Developing

1/19

A Bimodal Architecture using

Unlicensed band by developing RF

planning tool in Matlab and Lab view

Presented by

Samad Bin Khalid

MS-FA09-0028

Advisor

Sir Abbass Ali


2/19

Table of Content

` Problem Statement` Abstract


3/19

Problem Statement

` In order to extent the coverage and capacity of cellular network theMobile Network Operator have implemented Unlicensed Mobile

Access by integrating it with UMTS and GSM core network as it is

cost effective and it is a fast deployment solution.

` Implementing UMA in villages and rural areas is an issues, as thereis no infrastructure for backhaul.

` Dual band Mobile hand set is not very common (3G+2G+Wifi), in fact the

majority of the users can not afford the expensive dual band mobile

handsets.

` To extend the service to remote areas having low population, give

rise to develop a solution which could offer easy, cost effective and

fast deployment.


4/19

Abstract

` In the last few years the growth in mobile services is confined tourban areas.

` The challenge now lies in providing affordable connectivity to the

people living in the rural areas.

` 3GPP develop Unlicensed Mobile Access (UMA).

` A Bimodal Architecture is developed on the principle of UMA.

` The Bimodal Architecture would provide Mobile Network Operators

to extend their network coverage.

` Implementing the Idea would not require to deploy full cellular site.


5/19

UMA Overview

` In traditional cellular network, mobile station (MS) talks with mobilecore network via access network, which consists of base station

(BS), base station controller (BSC) and antenna.

` In UMA solution, dual-mode handset will connect with mobile core

network via UMA network, which consists of access point, UNC(UMA network controller). Once dual mode handset detect WiFi

network, it will connect with the UNC via IP connection


6/19

UMA Overview


7/19

UMA Interfaces


8/19

UMA Interfaces

` A-, Gb-, Wm-, Lb-, and D/Gr- interfaces are standardized andcommonly used in 2G/3G mobile networks. They define the used

protocols and methods for interoperation between different network

elements.

` The A interface works between the base station controller (BSC) andthe mobile switching centre (MSC).

` The Gb interface is used between the BSC and the SGSN (serving

GPRS support node). Main function for this interface is to define the

used protocols and techniques needed for support of GPRS packettraffic and signaling.


9/19

UMA Interfaces

` The D / Gr interface is used for exchanging subscription informationbetween 3G AAA (Authentication, Authorization and Accounting) and

the HLR (Home Location Register) by means of MAP (Mobile

Application Part) protocol.

` The Lb interface is the newest addition to specifications. It is usedbetween the SMLC (Serving Mobile Location Centre) and UNC.

` Up interface is the new interface that UMA requires and it is used

between MS and UNC. This interface is used to define the signaling,

voice and data transfer protocol architectures for both circuit andpacket switched connections.


10/19

Requirements for Bimodal Architecture

` IP based RAN architecture where the different remote sites connectwith each other on IP based Microwave backhauling.The technology

proposed for this is an IEEE 802.11a and IEEE 802.11g

` Mobile Network Operators can setup Microwave Point to Point and

Point to Multipoint links in unlicensed band which is 5.0 GHz and 2.4GHz.

` Bimodal Architecture user will not require a dual band Mobile hand

set, the user just need a conventional mobile handset in order to

make cellular transactions

` The minimum bandwidth of the Abis interface between the base

transceiver station (BTS) and the base station controller (BSC) is 2

Mbps.


11/19

Purposed Bimodal Network Architecture

BSCCore

NetworkCGW

OMC NMS

RGWGAP

AccessPoints

E1/T1

IP based

Microwave link

E1/T1

Abis Over IP

Signaling


12/19

Local Switching Function

t

t

t

t

B S C M S CL S F

G A P

A c c e s s P o i ts

S p e e c h D

t

is

S w it c h e d L o c a ll

G A P

A c c e s s

P o i t s

S i g n a l i n g

V o i c

V il la g e A

V il la g e B


13/19

Bimodal Architecture Network Elements

` GSM Access Point` A GSM Access Point is a radio base station. It provides a GSM

interface for subscriber terminals and switches traffic within its local

cell. It also provides IP encapsulation for traffic being routed to the

Access gateways.

` Features

` 850/900/1800/1900 MHz GSM air interface

` Light 5 m site construction

` 23 km coverage with Omni or directional/sector antenna` IP-based backhaul, typically 20-30 km range

` No BSC, transcoder or MSC needed to complete a local call

` Database with call records


14/19


` Access Gateways` Central Gateway (CGW) is a part of BSC end. Its main function is to

provide the internetworking function between the Cellular signaling

and the Microwave IP backhaul. The CGW is capable of converting

the E1/T1 signaling to IP in order to transmit the signaling for network

calls to the BTS site.

` Remote Gateway (RGW) is a part of BTS end where it reconverts the

cellular signaling over IP in E1/T1 and provide interface to connect

with the GSM Access point.


15/19


` IP Backhaul` The IP backhaul operates on the 5.0GHZ band which is an ISM band

(industrial Scientific Medical band) for which they do not have to

purchase the frequency as well

` The technology proposed for the microwave backhaul is the IEEE

802.11a which provides data rate up to 54 Mbps. 20- 30km of point

to point and point to multipoint backhaul links can be establish to

connect multiple remote sites with the BSC (Base Station Controller)


16/19


17/19

Microwave Backhaul Planning

` Fresnel Zone

` Earth Bulge

` Antenna Height

` Free Space path Loss Lp = (92.4 + 20 log10 F) + (20

log10 D)

` Received Signal RX Signal = EIRP FSL + RX

Gt Coax Cable Loss.

` Fade Margin SOM=RX Signal-RX Sensitivity


18/19

RF Planning for Cellular coverage

` OkumaraHata model

OpenDdBAL

SuburbanCdBAL

UrbanEdBAL

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1,20030,1500150

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19/19

RF Planning for Cellular coverage

` COST 231 Extension to Hata Model

Documents

A Bimodal Architecture Using Unlicensed Band by Developing