Integration Of UMTS And B-ISDN: Is It Possible Or Desirable? Essay, Research Paper

Integration Of UMTS And B-ISDN: Is It Possible Or Desirable?

Introduction

In the hereafter, bing fixed webs will be complemented by nomadic webs

with similar Numberss of users. These nomadic users will hold indistinguishable

demands and outlooks to the fixed users, for on-demand applications of

telecommunications necessitating high bit-rate channels. It will be necessary for

these fixed and nomadic webs to interoperate in order to go through informations, in existent

clip and at high velocities, between their users.

But how far must this interoperation be taken? How much integrating of the fixed

and nomadic web constructions is needed? Here, a fixed web, B-ISDN, and a

nomadic web, UMTS, under development at the same clip, are examined to see

how good and closely they should work together in order to run into expected user

demands. Work already taking topographic point on this is discussed.

Background

The Universal Mobile Telecommunication System ( UMTS ) , the 3rd coevals of

nomadic webs, is soon being specified as portion of the European RACE

engineering enterprise. The purpose of UMTS is to implement terminal mobility and

personal mobility within its systems, supplying a individual universe nomadic criterion.

Outside Europe, UMTS is now known as International Mobile Telecommunications

2000 ( IMT2000 ) , which replaces its old name of Future Public Land Mobile

Telecommunication System ( FPLMTS ) . [ BUIT95 ]

UMTS is envisaged as supplying the substructure needed to back up a broad scope

of multimedia digital services, or teleservices [ CHEU94 ] , necessitating channel bit-

rates of less than the UMTS upper ceiling of 2 Mbits/second, as allocated to it

in the World Administrative Radio Conference ( WARC ) & # 8216 ; 92 sets. UMTS must besides

support the traditional Mobile services soon offered by separate webs,

including cordless, cellular, paging, wireless local cringle, and orbiter

services. [ BUIT95 ] Mobile teleservices necessitating higher spot rates, from 2 to 155

Mbits/second, are expected to be catered for by Mobile Broadband Services ( MBS ) ,

the eventual replacement to UMTS, which is still under survey. [ RACED732 ]

Broadband Integrated Services Digital Network ( B-ISDN ) , conceived as an all-

purpose digital web that will supplant Narrowband ISDN ( N-ISDN or ISDN ) , is

besides still being specified. B-ISDN, with its conveyance bed of Asynchronous

Transportation Mode ( ATM ) is expected to be the anchor of future fixed digital

webs. [ MINZ89 ]

It is anticipated that, by the twelvemonth 2005, up to 50 % of all communicating

terminuss will be nomadic. [ CHEU94 ] The Mobile Green Paper, issued by the

European Commission in 1994, predicts 40 million nomadic users in the European

Union by 2000, lifting to 80 million by 2010. This gives nomadic users an

importance ranking aboard fixed-network users. [ BUIT95 ]

One consequence of this growing in nomadic telecommunications will be the addition in

teleservice operations that originate in either the fixed or nomadic web, but

terminate in the other, traversing the boundary between the two. UMTS is expected

to be introduced within the following 10 old ages, and integrating with narrowband and

broadband ISDN is possible in this clip. Interoperability between UMTS and ISDN

in some manner will be necessary to back up the interoperability between the

fixed and nomadic webs that users have already come to anticipate with bing

nomadic webs, and to run into the outlook of consistence of fixed/mobile

service proviso laid out in the initial RACE vision. [ SWAI94 ]

One manner of doing UMTS attractive to possible clients is to offer the same

scope of services that B-ISDN will offer, within the bounds of the lower 2

Mbits/second ceiling of UMTS. [ BUIT95 ]

So, with the duplicate ends of run intoing bing outlooks and doing UMTS as

flexible as possible to pull clients, how closely incorporate must UMTS be

with B-ISDN to accomplish this?

ALTERNATIVES FOR INTEGRATING UMTS WITH OTHER NETWORKS

The UMTS web could be developed along one of the undermentioned option

integrating waies:

1. Developing an & # 8216 ; optimised & # 8217 ; web construction and signalling

protocols tailored for the particular nomadic demands of

UMTS. This would be incompatible with anything else. Servicess

from all fixed webs would be passed through via gateways.

This design-from-scratch method would ensue in extremely

efficient intra-network operation, at the disbursal of extremely

inefficient inter-network operation, high development cost,

agnosticism associating to non-standard engineering, and decelerate

market take-up. True integrating with fixed webs is non

possible in this scenario.

Given the drawbacks, this is non a realistic option, and it

has non been considered in deepness. One of the RACE ends was to

design UMTS non as a separate sheathing web, but to let

integrating with a fixed web ; this option is unwanted.

[ BUIT95 ]

2. Integration with and development from the bing Global

System for Mobile telecommunication. ( GSM, once standing

for Group Special Mobil during early French-led specification,

is now taken as intending Global System for Mobile

communications by the non-French-speaking universe. ) GSM is

presently being introduced on the European market.

This option has the advantage of utilizing already-existing Mobile

substructure with a ready and confined market, but at the

disbursal of restricting channel bit-rate well, which in

bend limits the services that can be made available over UMTS.

Some of the proficient premises of UMTS, such as advanced

security algorithms and distributed databases, would necessitate

new protocols to implement over GSM. GSM would be restricting the

capablenesss of UMTS. [ BROE93a ]

3. Integration with N-ISDN. Like the GSM option above, this

ab initio limits UMTS & # 8217 ; s channel bit-rate for services, but has

a distinguishable advantage over integrating with B-ISDN & # 8211 ; N-ISDN is

widely available, right now. However, incorporating UMTS and

N-ISDN would necessitate effectual usage of the intelligent web

construct for the execution of nomadic maps, and

alteration to bing fixed web protocols to back up

nomadic entree.

Integrating UMTS with N-ISDN makes possible widespread early

debut and interoperability of UMTS in countries that do non

yet have B-ISDN available. This allows wider market

incursion, as investing in new B-ISDN equipment is non

required, and removes the dependence of UMTS on successful

consumption

of B-ISDN for interoperability with fixed webs.

Eventual interoperability with B-ISDN, albeit with

bottlenecks imposed on UMTS by the initial N-ISDN

compatibility, is non prevented. [ BROE93a ]

4. Integration with B-ISDN. This scenario was the mark of

MONET ( MObile NETwork ) , or RACE Project R2066. Unlike the

above options, B-ISDN & # 8217 ; s high available bandwidth and characteristic

set does non enforce restrictions on the service provisioning in

UMTS. Fewer limitations are placed on the possible utilizations and

marketability of UMTS as a consequence. Development of B-ISDN is

taking topographic point at the same clip as UMTS, doing smooth

integrating and version of the criterions to each other

possible.

For these grounds, integrating of UMTS with B-ISDN has been accepted as the

eventual end for interoperability of future fixed and nomadic webs utilizing

these criterions, and this integrating has been discussed in deepness. [ BROE93a,

BROE93b, BUIT95, NORP94 ]

At present, bing B-ISDN criterions can non back up the mobile-specific

maps required by a nomadic system like UMTS. Enhancements back uping Mobile

maps, such as call handover between cells, are needed before B-ISDN can move

as the nucleus web of UMTS.

Flexible support of fixed, multi-party calls, to let B-ISDN to be used in

conferencing and broadcast medium applications, has many of the same demands as

support for nomadic shift, so providing common solutions to let both could

understate the figure of mobile-specific extensions that B-ISDN demands.

As an illustration of how B-ISDN can be adjusted to run into UMTS & # 8217 ; s demands, allow & # 8217 ; s expression at

that nomadic demand for support for call handover. Within RACE a multiparty-

capable sweetening of B-ISDN, upwards compatible with Q.2931, has already been

developed, and implementing UMTS with this has been studied. For illustration, a UMTS

handover can be handled as a multi-party call, where the cell the Mobile is

traveling to is added to the call as a new party, and the old cell is dropped as a

party go forthing the call, utilizing ADD ( _party ) and DROP ( _party ) primitives. Other

nomadic maps can be handled by similar versions to the B-ISDN protocols.

The sweetenings to B-ISDN Release 2 and 3 that are required for UMTS support

are minimum plenty to be able to organize an built-in portion of future B-ISDN

criterions, without impacting on bing B-ISDN work. [ BUIT95 ]

These alterations merely concern high-ranking B-ISDN signalling protocols, and make

non change the conveyance mechanisms. The underlying ATM beds, including the ATM

version bed ( AAL ) are unaffected by this.

THE INTELLIGENT NETWORK

The Intelligent Network ( IN ) is a agency for service suppliers to make new

services and quickly present them on bing webs. As the IN was

considered utile for implementing mobility processs in UMTS, it was studied

as portion of MONET, and is now specified in the Q.1200 series of the ITU-T

recommendations.

The intelligent web separates service control and service informations from basic

name control. Service control is so activated by & # 8216 ; trigger points & # 8217 ; in the basic

call. This means that services can be developed on computing machines independent of the

web switches responsible for basic call and connexion control. This gives

flexibleness to the web operators and service suppliers, every bit good as the

potency to back up the services on any web that supports the trigger

points. Finally, IN can be expanded to command the web itself, such as

managing all UMTS nomadic maps. [ BROE93a ]

Any web back uping the intelligent web service set will be able to

support new services utilizing that service set easy, doing integrating of

webs easier and transparent to the user of those services. The intelligent

web is therefore an of import factor in the integrating of B-ISDN and UMTS. UMTS,

B-ISDN and the intelligent web set are all being developed at the same clip,

leting each to act upon the others in bring forthing a coherent, integrated whole.

[ BUIT95 ]

Decision

In order to be accepted by users as utile and to supply as broad a assortment of

services as possible, UMTS needs some signifier of interoperabilty or integrating

with a fixed web. Integration of UMTS with B-ISDN offers the most

flexibleness in supplying services when compared to other web integrating

options, and constrains UMTS the least.

With the addition in the figure of services that will be made available in UMTS

and B-ISDN over present standalone services, it is unrealistic to develop two

separate, and incompatible, versions of each service for the fixed and nomadic

webs. Integrating UMTS and B-ISDN makes the same service set available to

both sets of users in the same timescale, cut downing development costs for the

services, and advancing consumption and usage in the market. The intelligent web

construct allows the easy proviso of extra services with small excess

development cost. Integrating UMTS with B-ISDN, and with the intelligent web

set, is hence desirable.

Work on this integrating indicates that the nomadic demands of UMTS can be

met by widening bing B-ISDN signalling to manage them, without

significantly modifying B-ISDN. Integration of UMTS with B-ISDN is hence

technically executable.

Mentions

[ BROE93a ] W. van lair Broek, A. N. Brydon, J. M. Cullen, S. Kukkonen, A. Lensink,

P. C. Mason, A. Tuoriniemi, & # 8220 ; RACE 2066: Functional theoretical accounts of UMTS and

integrating into future webs & # 8221 ; , IEE Electronics and Communication Engineering

Journal, June 1993.

[ BROE93b ] W. van lair Broek and A. Lensink, & # 8220 ; A UMTS architecture based on IN and

B-ISDN developments & # 8221 ; , Proceedings of the Mobile and Personal Communications

Conference, 13-15 December 1993. IEE Conference Publication 387.

[ BUIT95 ] E. Buitenwerf, G. Colombo, H. Mitts, P. Wright, & # 8220 ; UMTS: Fixed web

issues and design options & # 8221 ; , IEEE Personal Communications, February 1995.

[ CHEU94 ] J. C. S. Cheung, M. A. Beach and J. P. McGeehan, & # 8220 ; Network planning for

third-generation nomadic wireless systems & # 8221 ; , IEEE Communications Magazine, November

1994.

[ MINZ89 ] S. E. Minzer, & # 8220 ; Broadband ISDN and Asynchronous Transfer Mode ( ATM ) & # 8221 ; ,

IEE Communications Magazine, September 1989.

[ NORP94 ] T. Norp and A. J. M. Roovers, & # 8220 ; UMTS integrated with B-ISDN & # 8221 ; , IEEE

Communications Magazine, November 1994.

[ RACED732 ] IBC Common Functional Specification, Issue D. Race D732: Service

Aspects.

[ SWAI94 ] R. S. Swain, & # 8220 ; UMTS & # 8211 ; a twenty-first century system: a RACE Mobile undertaking line

assembly vision & # 8221 ;

End.