What Are Difference Betwwen A Cdma And Gsm?

[tinoymalayil 0]

CDMA(Code Division Mutiple Access) and GSM are two types of technologies are using in mobile phones nowadays.what is actually the advantage of CDMA over GSM?Somebody likes CDMA..They stated that CDMA have higher performance.

[aloKNsh 0]

In cellular service there are two main competing network technologies: Global System for Mobile Communications (GSM) and Code Division Multiple Access (CDMA). Cellular carriers including Sprint PCS, Cingular Wireless, Verizon and T-Mobile use one or the other. Understanding the difference between GSM and CDMA will allow you to choose a carrier that uses the preferable network technology for your needs.
The GSM Association is an international organization founded in 1987, dedicated to providing, developing, and overseeing the worldwide wireless standard of GSM. CDMA, a proprietary standard designed by Qualcomm in the United States, has been the dominant network standard for North America and parts of Asia. However, GSM networks continue to make inroads in the United States, as CDMA networks make progress in other parts of the world. There are camps on both sides that firmly believe either GSM or CDMA architecture is superior to the other. That said, to the non-invested consumer who simply wants bottom line information to make a choice, the following considerations may be helpful.

Coverage: The most important factor is getting service in the areas you will be using your phone. Upon viewing competitors' coverage maps you may discover that only GSM or CDMA carriers offer cellular service in your area. If so, there is no decision to be made, but most people will find that they do have a choice.

Data Transfer Speed: With the advent of cellular phones doing double and triple duty as streaming video devices, podcast receivers and email devices, speed is important to those who use the phone for more than making calls. CDMA has been traditionally faster than GSM, though both technologies continue to rapidly leapfrog along this path. Both boast "3G" standards, or 3rd generation technologies.

EVDO, also known as CDMA2000, is CDMA's answer to the need for speed with a downstream rate of about 2 megabits per second, though some reports suggest real world speeds are closer to 300-700 kilobits per second (kbps). This is comparable to basic DSL. As of fall 2005, EVDO is in the process of being deployed. It is not available everywhere and requires a phone that is CDMA2000 ready.

GSM's answer is EDGE (Enhanced Data Rates for GSM Evolution), which boasts data rates of up to 384 kbps with real world speeds reported closer to 70-140 kbps. With added technologies still in the works that include UMTS (Universal Mobile Telephone Standard) and HSDPA (High Speed Downlink Packet Access), speeds reportedly increase to about 275380 kbps. This technology is also known as W-CDMA, but is incompatible with CDMA networks. An EDGE-ready phone is required.

In the case of EVDO, theoretical high traffic can degrade speed and performance, while the EDGE network is more susceptible to interference. Both require being within close range of a cell to get the best speeds, while performance decreases with distance.

Subscriber Identity Module (SIM) cards: In the United States only GSM phones use SIM cards. The removable SIM card allows phones to be instantly activated, interchanged, swapped out and upgraded, all without carrier intervention. The SIM itself is tied to the network, rather than the actual phone. Phones that are card-enabled can be used with any GSM carrier.

The CDMA equivalent, a R-UIM card, is only available in parts of Asia but remains on the horizon for the U.S. market. CDMA carriers in the U.S. require proprietary handsets that are linked to one carrier only and are not card-enabled. To upgrade a CDMA phone, the carrier must deactivate the old phone then activate the new one. The old phone becomes useless.

Roaming: For the most part, both networks have fairly concentrated coverage in major cities and along major highways. GSM carriers, however, have roaming contracts with other GSM carriers, allowing wider coverage of more rural areas, generally speaking, often without roaming charges to the customer. CDMA networks may not cover rural areas as well as GSM carriers, and though they may contract with GSM cells for roaming in more rural areas, the charge to the customer will generally be significantly higher.

International Roaming: If you need to make calls to other countries, a GSM carrier can offer international roaming, as GSM networks dominate the world market. If you travel to other countries you can even use your GSM cell phone abroad, providing it is a quad-band phone (850/900/1800/1900 MHz). By purchasing a SIM card with minutes and a local number in the country you are visiting, you can make calls against the card to save yourself international roaming charges from your carrier back home. CDMA phones that are not card-enabled do not have this capability, however there are several countries that use CDMA networks. Check with your CDMA provider for your specific requirements.

According CDG.org, CDMA networks support over 270 million subscribers worldwide, while GSM.org tallies up their score at over 1 billion. As CDMA phones become R-UIM enabled and roaming contracts between networks improve, integration of the standards might eventually make differences all but transparent to the consumer.

The chief GSM carriers in the United States are Cingular Wireless, recently merged with AT&T Wireless, and T-Mobile USA. Major CDMA carriers are Sprint PCS, Verizon and Virgin Mobile.

I got this from

http://http://www.wisegeek.org/what-is-the-difference-between-gsm-and-cdma.htm

and also i think CDMA is bascially an operator providing a cellphone with which only their particular company's sim or wim will work like if you buy vigin you can only use vigin operator where as gsm gives you the liberty to use any GSM sim on any GSM compatible handset.

[jjaenagle 0]

the next best thing to gsm and cdma will be LTE! I think Sprint has already started incoorporating it and verizon and ATT and some other major carriers will start using it within the next few years.

[ramiya 0]

CDMA(Code Division Mutiple Access) and GSM are two types of technologies are using in mobile phones nowadays.what is actually the advantage of CDMA over GSM?
Somebody likes CDMA..They stated that CDMA have higher performance.

 

 

The main differences of CDMA and GSM are,

1.CDMA (Code Division Multiple Access)after digitizing data, spreads it out over the entire bandwidth available to it.GSM (Global System for Mobile communication) is a digital mobile telephone system that is widely used around the world .

2.In CDMA network,there is one physical channel and a special code for every device in the coverage network.In GSM network,every cell has a corresponding network tower, which serves the mobile phones in that cellular area.
3.Handset network service is specific in CDMA ,but in GSM it is SIM specific, User has option to select handset of his choice ,sometime it will locked with a particular network contract for a particular periods, but we can remove it by getting the unlocking service from an provider like OnlineGSMUnlocking.com

 

4.CDMA offers more efficient use of an analog transmission because it allows greater frequency reuse, as well as increasing battery life, improving the rate of dropped calls, and offering far greater security than GSM/TDMA.GSM is the dominant technology used around the globe and is available in more than 100 countries. It is the standard for communication for most of Asia and Europe.
5.GSM is a very straight forward standard, whereas, CDMA is somewhat complicated. According to me gsm is better as it is globally accepted and used except some countries.You can change the sim cards whenever you like and you put that in any other phone you like.For data transfers it offers networks like GPRS, EDGE, and the latest HSDPA [3g] Technologies....

cause it allows greater frequency reuse, as well as
CDMA offers more efficient use of an analog transmission because it allows greater frequency reuse, as well as increasing battery life, improving the rate of dropped calls, and offering far greater security than GSM/TDMA. For this reason CDMA has strong support from experts who favor widespread development of CDMA networks across the globe.

Edited December 20, 2013 by ramiya (see edit history)