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Tue. May 30th, 2023


The enterprise of wi-fi information is predicted to develop within the area of 100-200 % every year and the cell communication business agrees that wi-fi information companies will type the inspiration for future enterprise. The large success of brief messaging in lots of international locations proves that individuals settle for the advantages of non-voice companies.

Enhanced Knowledge Fee for International Evolution (EDGE) is a know-how that provides International Techniques for Cell Communications (GSM) the capability to deal with companies for the third era of cell telephony. It offers 3 times the info capability of Normal packet Radio Service (GPRS). Utilizing EDGE, operators can deal with 3 times extra subscribers than GPRS; triple their information price per subscriber, or add further capability to their voice communications.

This text offers an summary of EDGE know-how. Particularly, ranging from the introduction of this 2.5G know-how I describe the core technical features and distinct options. I’ll present a comparability with GPRS for information companies after which a survey of the present state of this know-how in Pakistan. I’ve additionally coated some advantages for operators and prospects.

1. Introduction

The significance of wi-fi information and multimedia companies each for enterprise and finish prospects are rising on an unparalleled scale. Enhanced Knowledge Charges for GSM Evolution (EDGE) is a brand new radio interface answer and relies on an enhanced modulation. EDGE affords GSM community operators an evolution path to cell information and multimedia companies with a 3 fold enhance of knowledge throughput within the current GSM spectrum. EDGE subsequently offers another for operators who do not need a Common Cell Telecommunication System (UMTS) license. Furthermore it additionally represents a complement to UMTS for operators aspiring to first deploy UMTS solely in densely populated areas, however who also can use EDGE to offer huge space protection of future oriented 3G companies. Within the US market operators have chosen EDGE because the 3G options. [8].

We’re presently experiencing the Wi-fi Utility Protocol (WAP) in addition to the upper transmission speeds of Excessive Velocity Circuit Switched Knowledge (HSCSD), joined by the comfort of “all the time on-line” direct Web connections with GPRS. [1]

EDGE, new radios interface know-how with enhanced modulation, will increase the HSCSD and GPRS information charges by as much as three fold. EDGE modulation goes to extend the info throughput offered by the packet switched service even over 400 kbps per provider. Equally, the info charges of circuit switched information will be elevated, or current information charges will be achieved utilizing fewer timeslots, saving capability. Accordingly, these larger velocity information companies are known as EGPRS (Enhanced GPRS) and ECSD (Enhanced Circuit Switched Knowledge).

EDGE, is a significant enchancment in GSM part 2+. As a modification to current GSM networks, EDGE doesn’t require new community components. [1]

Within the US, for example, EDGE is a part of the IS-136 Excessive Velocity idea, which is among the third era Radio Transmission Know-how (RTT) proposals from TR.45. EDGE is ultimately going to be standardized which makes attainable to realize a world cell radio system with many companies attribute to 3rd era methods.

2. Overview

The elevated bit charges of EDGE put necessities on the GSM/GPRS community structure. Determine. 1 illustrates the GSM/GPRS structure, the shaded elements of that are mentioned on this part. Different nodes and interfaces should not affected in any respect by EDGE introduction. An obvious bottleneck is the A-bis interface, which right now helps as much as 16 kb/s per visitors channel. With EDGE, the bit price per visitors channel will strategy 64 kb/s, which makes allocation of a number of A-bis slots to 1 visitors channel needed. Various asynchronous switch mode (ATM) or IP-based options to this drawback can be discusses.

One vital truth is, nonetheless, that the 16 kb/s restrict might be exceeded already by the introduction of two coding schemes (CS3 and CS4) in GPRS, which have a maximal bit price per visitors channel of 22.Eight kb/s. Consequently, the A-bis limitation drawback is being solved outdoors the EDGE standardization, and it’s subsequently a GPRS associated, not EDGE-related, modification. For GPRS-based packet information companies, different nodes and interfaces are already able to dealing with larger bit charges, and are thus not affected. For circuit-switched companies, the A interface can deal with 64 kb/s per person, which isn’t exceeded by EDGE circuit-switched bearers. [9]

2.1. Affect on GSM Community Planning

An vital prerequisite, which to a big extent will decide the success of EDGE in GSM, is community operator be capable to introduce EDGE regularly. For preliminary deployment, EDGE-capable transceivers will complement customary GSM/GPRS transceivers in a subset of the prevailing cells the place EDGE protection is desired. Therefore, an built-in mixture of GSM, GPRS, and EDGE customers will coexist in the identical frequency band. To attenuate effort and value for the community operator, radio community planning (together with cell planning, frequency setting of energy and different cell parameters) should not require in depth modification.

2.1.1. Protection Planning

One attribute of non-transparent radio hyperlink protocols that embrace automated repeat request (ARQ), is that low radio hyperlink high quality solely ends in a decrease bit price for the person. Therefore, low SIR for a person doesn’t lead to a dropped name, as for speech, however in a short lived lower of person bit price. For clear bearers, which usually supply a relentless bit price, hyperlink high quality management have to be prolonged to include useful resource allocation, within the sense that the variety of dynamically allotted time slots suits the bit price and bit error price (BER) retirements. Clear bearers, will thus be accessible in the complete GSM cell, however require fewer time slots within the middle of the cell (the place Eight-PSK coding schemes can be utilized).

2.1.2. Frequency Planning

Most mature GSM networks of right now have a mean frequency reuse issue of round 9 (that means that accessible frequencies are divided into 9 frequency teams). Nevertheless, there’s additionally a development towards tighter reuse elements. With the usage of frequency hopping, a number of reuse patterns (MRP), and discontinuous transmission (DTX), reuse elements as little as Three change into possible. EDGE helps quite a lot of reuse patterns. The truth is, by its use of hyperlink high quality management, EDGE will be launched in an arbitrary frequency plan, and profit from excessive SIR nearer to the bottom stations. EDGE will be launched in an current GSM frequency plan, and that it additionally helps future high-capacity options based mostly on tighter frequency reuse.

2.1.Three. Radio Community Planning

An vital prerequisite (and to a big extent, one that can decide the success of Edge) is that community operators ought to be capable to introduce Edge regularly. The preliminary deployment of Edge-capable transceivers will complement customary GSM transceivers in a subset of cells the place Edge protection is desired. An built-in combination of circuit-switched, GPRS and Edge customers will thus coexist in the identical frequency band. To attenuate operator efforts and prices, Edge-related implementation should not require in depth modification of the radio community plan (together with cell planning, frequency planning, the setting of energy ranges and different cell parameters).

2.1.Four. Channel Administration

After Edge has been launched, a cell will usually embrace two kinds of transceiver: customary GSM transceivers and Edge transceivers. Every bodily channel (time slot) within the cell will be seen as being one in every of at the very least 4 channel sorts:

1. GSM speech and GSM circuit-switched information (CSD);

2. GPRS packet information;

Three. Circuit-switched information, enhanced circuits witched information (ECSD), and GSM speech;

Four. Edge packet information (EGPRS), which permits a mixture of GPRS and EGPRS customers concurrently.

Whereas customary GSM transceivers solely help channel sorts 1 and a couple of, Edge transceivers help all 4 channel sorts. Bodily channels are dynamically outlined in keeping with terminal capabilities and desires within the cell. For instance, if a number of speech customers are energetic, the variety of type-1 channels is elevated, on the expense of GPRS and Edge channels. Clearly, channel administration have to be automated, to keep away from the splitting of channels into static teams. In any other case, trunking effectivity would diminish.

Three. Interleaving

To extend the efficiency of the upper coding schemes in EGPRS (MCS7 to MCS9) even at low C/I, the interleaving process has been modified throughout the EGPRS customary. When frequency hopping is used, the radio setting is altering on a per-burst stage. As a result of a radio block is interleaved and transmitted over 4 bursts for GPRS, every burst might expertise a very completely different interference setting. [7]

If simply one of many 4 bursts will not be correctly acquired, the complete radio block won’t be correctly decoded and must be retransmitted. Within the case of CS4 for GPRS, hardly any error safety is used in any respect. With EGPRS, the usual handles the upper coding scheme otherwise than GPRS to fight this drawback. MCS7, MCS8 and MCS9 really transmit two radio blocks over the 4 bursts, and the interleaving happens over two bursts as a substitute of 4. This reduces the variety of bursts that have to be retransmitted ought to errors happen. The probability of receiving two consecutive error free bursts is larger than receiving 4 consecutive error free bursts. Which means that the upper coding schemes

for EDGE have a greater robustness with regard to frequency hopping.


EDGE, or the Enhanced Knowledge Fee for International Evolution, is the brand new mantra within the International Web Connectivity scene. EDGE is the brand new identify for GSM 384. The know-how was named GSM 384 due to the truth that it offered Knowledge Transmission at a price of 384 Kbps. It consists of the Eight sample time slot, and the velocity might be achieved when all of the Eight time slots have been used. The thought behind EDGE is to acquire even larger information charges on the present 200 KHz GSM provider, by altering the kind of the modulation used.

Now, that is probably the most putting characteristic. EDGE, as being as soon as a GSM know-how, works on the prevailing GSM or the TDMA carriers, and allows them to most of the 3G companies. Though EDGE may have slightly technical impression, since its totally based mostly on GSM or the TDMA carriers, however it may simply get an EDGE over the up coming applied sciences, and naturally, the GPRS. With EDGE, the operators and repair suppliers can supply extra wi-fi information utility, together with wi-fi multimedia, e-mail (Internet Based mostly), Internet Infotainment, and above all, the know-how of Video Conferencing.

Now all these applied sciences that have been named earlier, have been the clauses of the IMT-UMTS 3G Package deal. However, with EDGE, we will get all these 3G companies on our current GSM telephones, which could simply show to be a boon to the person.

The present state of affairs clearly states that EDGE will certainly rating larger than GPRS. The previous permits its customers to extend the info velocity and throughput capability, to round Three-Four instances larger than GPRS.

Secondly, it permits the prevailing GSM or the TDMA carriers to present the delicate 3G companies. And with 1600 Million subscribers of GSM in over 170 international locations, supply the complete International Roaming, anyplace between India to Japan and to San Francisco. Based mostly on an Eight PSK modulation, it permits larger bit price throughout the air Interface. There’s one image for each Three bits. Thus, EDGE Fee is the same as 3x GPRS Fee.

5. Future Evolution In the direction of WCDMA

The subsequent evolutionary step for the GSM/EDGE mobile system consists of enhancements of service provisioning for the packet-switched area with the service provisioning in UMTS/UTRAN (UMTS terrestrial radio entry community). GERAN will present improved help for all high quality of service (QoS) lessons outlined for UMTS: interactive, background, streaming and conversational. By doing so, a brand new vary of purposes, together with IP multimedia purposes, might be adequately supported. This a part of the GSM/EDGE evolution focuses on help for the conversational and streaming service lessons, as a result of satisfactory help for interactive and background companies already exists. Moreover, parallel simultaneous bearers will help multimedia purposes with completely different QoS traits in direction of the identical MS, similar to a number of media streams dealt with by means of IMS area. A driver for such evolution on the packet-switched aspect is the paradigm shift throughout the telecommunications world from circuit to packet-switched communications.

Each the core community outlined for GPRS and the present GSM/EDGE radio entry community require modifications to help enhanced packet companies. The GPRS/EGPRS networks can shortly and affordably evolve with market wants, and align with companies offered by WCDMA networks. The present evolution of GSM/EDGE, which covers all the above features, is being standardized in 3GPP TSG GERAN. [4]

6. EDGE in Pakistan

Pakistan has the sixth largest inhabitants on the planet – roughly 150 million. There are at the moment 4 cell operators within the nation. Cell penetration on the finish of 2003 was simply 2.Three% with a subscriber base of three.Four million, whereas mounted line penetration was roughly 2.Four%. Many geographic areas in Pakistan are with out phone protection. To accompany latest optimistic financial improvement in Pakistan and the inherently low cell penetration, excessive progress throughout the cell section is predicted. In the mean time the individuals in Pakistan are extra concern with the text-enabled facility like SMS. Though the introduction of GPRS gave a brand new idea and new increase in Mobile community however nonetheless, individuals are not that a lot concern utilizing Web by their terminal. Few assume that it nonetheless extra expensive and few imagine that GPRS did not develop the curiosity for utilizing Web if we in contrast it by laptop.

In April 2004 Norwegian cell telecom operator, Telenor, bid for and finally received a license to function a mobile community in Pakistan. The license covers the operation of International System for Cell Communications (GSM), Normal Packet Radio Service (GPRS) and Enhanced Knowledge Charges for International Evolution (EDGE) know-how for the community. [14]

Telenor Pakistan has signed two offers with cell infrastructure contractors for various areas of the community:

Nokia have signed a three-year deal to construct and function a GSM / GPRS / EDGE community to cowl the central and Northern Punjab area (part one), centered round Lahore.

Siemens have signed a deal to construct a GSM / GPRS / EDGE community to cowl the southern areas of Pakistan, centered round Islamabad.

Additional enhancements in information functionality over the core GPRS / GSM community might be offered in each networks with the set up of Enhanced Knowledge for International (GSM) Evolution know-how. This element of the 2 methods might be put in after the preliminary roll-outs and can permit the subscribers to have the usage of superior cell companies similar to downloading video and music clips, full multimedia messaging, high-speed colour Web entry and electronic mail on the transfer.

Nortel Networks will improve Ufone’s current wi-fi methods and provide new GSM/GPRS core community and radio entry gear, together with Cell Switching Middle, House Location Register (HLR) and superior Base Transceiver Stations (BTS).

A key element of the Ufone enlargement might be Nortel Networks BTS 12000, designed to ship further capability inside a GSM/GPRS community whereas positioning operators to drive decrease prices and to supply superior wi-fi companies based mostly on third era (3G) EDGE (Enhanced Knowledge for GSM Evolution) know-how. The enlargement may also embrace Nortel Networks Passport Packet Voice Gateway (PVG) for migration of TDM voice trunking to a packet-based infrastructure.

7. Advantages

As highlighted beforehand the necessity to scale back enterprise threat and make the most effective use of current sources is of paramount significance inside right now’s enterprise setting.

7.1. Monetary

GSM based mostly networks have change into the usual throughout the mobile panorama. As EDGE is a GSM based mostly know-how and offers an enhancement for GPRS at slightly further price it’s thought-about one of the simplest ways wherein to capitalize on current sources. [1]

7.1.1. Radio Entry Community

Normally GPRS enabled base stations and BSC’s will be merely upgraded to EDGE by means of comparatively low-cost software program and upgrades, which is able to pro-long the life cycle of the deployed RAN components.

7.1.2. Core Community

For GPRS enhancement, there’s little or no modification to be accomplished inside a GPRS enabled core community, thus enhancing the sunk core community funding.

7.1.Three. Antenna Websites

There isn’t any requirement for added antenna websites when deploying EDGE. Assuming prime quality linear amplifiers with excessive RF output energy are used throughout the BTS, the protection sample would be the identical as the prevailing GPRS deployment, so defending current web site funding.

7.1.Four. Spectrum Utilization

EDGE triples the GPRS information capability while utilizing the prevailing GSM spectrum and affords as much as 3 times the GPRS information price to the top person. EDGE is spectrally probably the most environment friendly radio know-how for information purposes requiring as much as 100Kb/s throughput (in comparison with CDMA and WCDMA), and solely WCDMA is spectrally higher for larger throughputs.

7.1.5. Purposes

GPRS enabled purposes and companies will typically not require any further funding to change into EDGE appropriate. That is additionally legitimate for identified WCDMA purposes.

Though the monetary advantages of EDGE will be apportioned to particular person community components as outlined above, one of many predominant enterprise drivers is that EDGE kinds an important a part of the general GSM evolution in direction of a seamless multi-radio GSM/ GPRS/EDGE/WCDMA community. As talked about beforehand GSM is the principle customary for mobile communications worldwide and the enterprise advantages of deploying an business customary know-how will be seen in almost each facet of a community deployment, from end-user gadgets, to purposes to .

7.2. For Operator

Operators also can experiences some great benefits of EDGE in following methods.

7.2.1. Migration to wi-fi multimedia companies

The operator can enhance information revenues by providing enticing new sorts purposes to end-users.

7.2.2. Improved buyer satisfaction

Elevated information capability and better information throughput will lower response instances for all information companies, thus retaining finish customers glad and related.

7.2.Three. Early deployment of 3G kind purposes

EDGE networks are anticipated to emerge in yr 2001, when mature markets are more likely to begin demanding multimedia purposes.

7.2.Four. Fast community implementation

EDGE won’t require new community components and EDGE functionality will be launched regularly to the community.

7.Three. For Consumer

7.Three.1. Improved high quality of service

Elevated information capability and better information throughput will ultimately fulfill the purchasers’ want for QoS.

7.Three.2. Private multimedia companies

Engaging new kinds of purposes and terminals will change into accessible.

7.Three.Three. Probably cheaper price per bit

Decrease price of knowledge capability for high-speed information purposes provides the operator flexibility in pricing.

Eight. Conclusion

Whereas the tug of warfare between entry applied sciences – CDMA vs. UMTS vs. GSM — continues to be debated globally, EDGE offers a super answer for GSM carriers so as to add information capability utilizing restricted spectrum. Retaining in view the truth that GSM helps extra subscribers right now than every other entry know-how (roughly 65 to 70% of the worldwide subscriber market), and that GSM/GPRS operators are scrambling so as to add capability to help person progress and launch subsequent era information companies, the elevated capability and throughput supplied by EDGE turns into very compelling. And, in a market the place wi-fi carriers should squeeze probably the most out of capital outlays–past and future, it’s no actual shock that we’re going to see a renewed wave of curiosity in EDGE from our GSM prospects.

At the moment the place of EDGE as a know-how evolution of GSM is evident. Initially promoted as a substitute for WCDMA and usually a distinct segment know-how, EDGE is now considered a key enabler for GSM/EDGE and WCDMA operators alike. Having the ability to drive enterprise worth from current GSM infrastructure and spectrum is among the predominant benefits, and along-with the flexibility of EDGE to cut back CAPEX, time-to-market and time-to-revenue, with regards the supply of world high-speed information companies, EDGE is a should know-how.

The mobile corporations working in Pakistan didn’t have the license for the EDGE. Now because the introduction of some new corporations like Telenor and WARID, it’s attainable that in close to future Pakistan may also be capable to use this facility. Then GPRS can change into an actual vital consider mobile community, because the individuals in Pakistan will use the Web not just for downloading ring tones but additionally can benefit from the streaming movies by their mobile phone and so many different amenities.

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