All about CDMA & GSM

[Sadikk 301]

isn't it possible to buy any cdma handsets and insert ruim (operator of ur choice) card and go mobile like GSM??

[Puneet 0]

That could be possible (am not sure) but how many sets are actaully available with RUIM? The only set that was available was the *buggy* Gtran

[SexyGurl 0]

CDMA is more spectrum efficient (not very sure of the tecnical reason behind it) .... but it means more people can talk using the same amount of spectrum.

This has a very big economic consequence. CDMA operators can afford to have larger cells -- that is to say eg. a CDMA & GSM operator both have 2 Mhz of spectrum. A CDMA operator could support 1000 subscribers in a single cell with 2 Mhz, but a GSM guy could support only 500 with 2Mhz. So, the only alternative to GSM is to have 2 smaller cells and duplicated use of the same spectrum.

It means, the GSM operator will have to invest in 2 BTS towers, where as only 1 tower for CDMA.

While 1 CDMA tower is costlier than 1 GSM tower .... it's far lower than 2 GSM towers. So CDMA service become cheaper. (The other consequence is that CDMA operator can also go for smaller cells and duplicate use of spectrum .... with each cell supporting 1000 subscribers .... so total of 2000 subscribers can by supported by CDMA, where as only 1000 by GSM). Here the total cost to CDMA will be higher (since 2 CDMA towers cost more than 2 GSM towers) .. BUT again, the cost per subscriber will still be lower, since CDMA has 2000 subscribers !

CDMA is a later technology, while GSM is old. But upgraded GSM ... tries to use the better aspects of CDMA in the 3G implementation, where the name is also W-CDMA (though, it's really for GSM operators)

[vb86 0]

cdma spectrum usage is 5-6 times more efficient than gsm.. That is a technological advantage for them and that doesn't mean that they should be allocated less spectrum. Also, if the 1900 band is with the defence and it stops gsm from rolling out 3g services till dec 2006, why should the cdma operators ( acc to the coai demands, though not met as of now) also be made to wait till that time, when they have been allocated spectrum for 3g in some other band.. COAI members should have thought of all this before opting for gsm.. Also, asking trai to make 1900 gsm exclusive is asking for too much. First they get the 900 band, then 1800 now they want the 1900 band which is ok as long as they share it with the cdma operators.. After all cdma operators need that band even for basic 2g services..

[adwait 0]

The reason why CDMA is more spectrum efficient is that in CDMA, the messages are passed in a random order over the wide spectrum and each part of the message is send thru a different frequency. Hence, the same frequency can be used to carry different messages of different users. On the other hand, GSM allocates one frequency in a spectrum to a user for the entire duration of the call.

This is also a reason for CDMA being more secure as, even if the communication is intercepted, the interceptor needs to know the exact sequence in which the parts of the message are sent in the different frequencies.

[Sadikk 301]

That could be possible (am not sure) but how many sets are actaully available with RUIM? The only set that was available was the *buggy* Gtran

33009[/snapback]

All nokia CDMA handsets come with RUIM slots.

[Pankaj Verma 0]

That could be possible (am not sure) but how many sets are actaully available with RUIM? The only set that was available was the *buggy* Gtran

33009[/snapback]

All nokia CDMA handsets come with RUIM slots.

33084[/snapback]

There are few sets available both Tata and Reliance which you can interchange.

Tata : Motorola C131, Nokia 2280 and other UIM supported handsets.

Reliance : GTRAN GCP 4020, Motorola V730, Telson TWC and other handset supporting RUIM.

[deepu 0]

Where can i insert RUIM in Motorola C131

[@ksh@T 20]

welll yes if u r a tata subscriber and possibly no if u r a RIM customer....

ADJJ

[Saurav 22]

will tata work on reliance with just a ruim?

has anyone tested?

ask ruim from u friend and test and plz PM me ur experience.

munnamobile can help us to test?

[hritik123 4]

Will Cellcos dump GSM with 3G rollout?

R SRIRAM

TIMES NEWS NETWORK[ SATURDAY, JUNE 04, 2005 12:44:09 AM]

Surf 'N' Earn -Sign innow

SAN DIEGO: Qualcomm, the San Diego based wireless giant, believes that many Indian cellular operators will dump the global system for mobile communications (GSM) technology and adopt the code division multiple access (CDMA) standard as they start rolling out high margin and exotic third-generation mobile services in the country, CEO-elect Dr Paul Jacobs has said.

The battle between CDMA and GSM, which generated much heated debate and controversy in India when the Reliance group and the Tatas rolled out their CDMA services some time ago, will eventually be resolved in favour of the former as the industry moves onto providing next generation services.

“CDMA is more efficient, cost-effective. It is the best for providing 3G services as many operators in Europe are discovering,” he told a group of Indian reporters on Wednesday in his sprawling office complex in San Diego, California.

Bharti Tele-Ventures, the country’s most valuable domestic phone company, and Bharat Sanchar Nigam Ltd, the state-owned telecom giant, are both believed to have chosen CDMA for their proposed 3G services.

Bharti, Qualcomm officials believe, will use the WCDMA (where W stands for wideband) technology, for its $ 1bn 3G services roll-out.

The 42-year-old Dr Jacobs, who takes over from his father Dr Irwin Jacobs as CEO of the $ 5bn Qualcomm on July 1, believes that the transition from GSM to CDMA for those providing 3G services will happen in different ways in different countries.

“What we are seeing in Europe is that companies are investing in 3G using CDMA, and then migrating other consumers onto it and then reforming their existing spectrum,” he added. The global tussle between CDMA and GSM, he believes, has decisively moved in favour of the former.

Numbers appear to back up his assertion. Qualcomm’s revenues, which rose 27% to $ 4.9bn in ‘04, could soar in the coming years as the company has a stranglehold in the global market for operators using CDMA technology. Its cash and cash equivalents are now about $ 8bn.

Indian operators are not the only ones mulling a shift to CDMA. Vodafone, the world’s largest mobile phone company by subscribers, is accelerating the roll-out of wireless 3G services and so are Verizon and Sprint, two of the largest US operators.

In India, Reliance and the Tata group are the only ones using the CDMA technology with a total subscriber base of more than 10m.

“GSM by definition has to hit the wall. Their volumes are only in the low unit category. Across the world, the revenues from WCDMA handsets are rapidly overtaking GSM/GPRS handsets. There are some applications that GPRS cannot handle such as high-speed graphics and multimedia,” says Jeffrey K Belk, senior vice president, marketing Qualcomm.

[Dilbert 0]

Smart me ...to choose reliance & dump my GSM

[inderpalsingh 0]

I wish to know which network to choose whether GSM or CDMA Why GSM more widely used and handsets options are very large depending upon your pocket and use?

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Edited June 23, 2005 by Vishal Gupta

[raccoon 53]

Inderpalsing, on the surface CDMA is probably the better choice, but rather than worrying about that, you should consider other more important factors like tariffs, flexibility, customer support, etc, etc. And RIM certainly does not score well on most of these fronts! GSM currently has more competitive tariffs. GSM also affords more flexibility and more advanced handsets are available. And RIM highway coverage is poor; etc, etc...

[deepu 0]

You cannot say that Tariff of RIM is higher...

Their STD rates are the cheapest around. Infact many of my friends using GSM mobiles have started buying RIM connection once they found out that the rates are cheaper when compared to GSM.