What is Wcdma ? How is it different from normal gsm

[jayesh]

wcdma is the upgrade path for gsm 2.5/2.7. Its a full blown seperate network with voice and data .

For more info

http://en.wikipedia.org/wiki/WCDMA

http://www.sss-mag.com/w-cdma1.html

http://www.ericsson.com/technology/...les/WCDMA.shtml <-------simplest explaination

[carcomptoy]

...what was the point of this thread?

[s02264849]

Interesting........Thanks for sharing :D

[jayesh]

...what was the point of this thread?

for people not as informed about it as you. A lot of people are confused between cdma gsm and wcdma. Just a simple info thread.

I did get a pm asking me what wcdma was... when i was speaking about it in another thread. Thats also partially the reason for this thread.

[carcomptoy]

Yeah, I realized that when I was looking through the Mobile Technology forum...sorry to seem rude...

[jayesh]

Yeah, I realized that when I was looking through the Mobile Technology forum...sorry to seem rude...


thats cool :)

[dtsm]

So does this dual band WCDMA work in both USA and say Korea and/or Japan? Or only USA?

[hotzigetty]

Depends on what band is utilised in japan.. 1900mhz or 2100mhz or 1800mhz...

[carcomptoy]

Only in the USA...the rest of the world uses solely 2100MHz, including Japan.

[kaebee]

is it possible to "convert" a cdma fone to gsm or vice versa?

[hotzigetty]

Haha thats funny... nope...

[carcomptoy]

Not at all...they use completely different protocols...it's be like trying to run Apple on a Windows PC...

[nikhiltalwar]

Its a upgraded form of a network for implementation of 3G.

[indelible]

okay, so how does this relate to UMTS and HSDPA?

how does it differ from CDMA2000?

after reading that wikipedia article I'm more confused than ever...

[fabarati]

UMTS is a form of Wcdma used almost everywhere wcdma is used. While it uses the Wcdma air interface, meaning it communicates between the basestation and your phone, it uses the gsm infrastructure.

HSDPA is an updated version of UMTS allowing much higher speeds (up to 14,4 mbit/s compared to umts' 384 kbit/s). the first rollout will be limited to 1,8 mbit, though it will be - and is being - upgraded for higher down- and upload speed.

Cdma2000 is another 3g standard, incompatible with wcdma. it's mostly used in the north americas, indonesia, south korea and japan. This is a direct competitior to Wcdma/umts/Hsdpa, but doesn't work in as many countries and doesn't allow as high a top speed as Hsdpa

[Geetanjali]

W-CDMA (Wideband Code Division Multiple Access) is a type of 3G cellular network. It is the higher speed transmission protocol used in the Japanese FOMA system and in the UMTS system, an advanced 3G system, designed as a replacement for the 2G GSM networks deployed worldwide.

FOMA is Cellular Network and UMTS is one of 3G Mobile Phone technologies

The GSM (Global System for Mobile Communications) is the most popular standard for mobile phones in the world. Basically GSM is a Cellualr Network since mobile phones connect it to by searching for cells in the vicinity.

WCDMA protocol ~ 3G Cellular Network
GSM is a Cellular Network.

[VodaMatt]

AMPS: Advanced Mobile Phone System. A first generation mobile communications service, generally referred to as "analogue" due to the way it handles calls. AMPS systems allow only one device per frequency (also known as “channel”) to be connected at any one time, and as it is an analogue technology it is susceptible to radio interference and eavesdropping using a radio scanner tuned to the frequency of a current call.

GSM: Global System for Mobiles (originally Groupe Spécial Mobile). Currently runs at 800MHz, 900MHz, 1800MHz, 1900MHz. USA/Canada uses 800MHz and 1900MHz. Almost everywhere else uses 900MHz and 1800MHz. GSM is also known as TDMA (Time Division Multiple Access) due to the way it divides a single frequency into time slots over a single period of time. It does this quickly enough not to be noticeable. It is also often referred to as a 2G network (AMPS or analogue networks being 1G). Most GSM towers have a maximum range of 30KM line-of-sight. GSM towers also have the ability to transmit a “cell broadcast” message that, in many cases, contains the tower's location.

CDMA: Code Division Multiple Access. A hybrid 2.5G/3G protocol that is similar to GSM in that it allows multiple users access to the network on the same frequency. GSM and CDMA differ in the way they actually provide multiple user access. CDMA networks assign a code for each device that is accessing the network and uses this code to discriminate between them. CDMA 1xRTT is the 2.5G equivalent for CDMA with speeds falling between GPRS and EDGE, whereas 1xEV-DO is the 3G equivalent with speeds between UMTS and HSDPA. All CDMA handsets are incompatible with any type of GSM network (including W-CDMA) however handsets do exist that allow access to both network simultaneously. As CDMA handsets generally don't have SIM cards if a handset is damaged then any data on them is very difficult to retrieve. CDMA is able to operate at 400MHz, 800MHz, 900MHz, 1700MHz, 1800MHz, 1900MHz and 2100MHz giving it the potential to have a much greater coverage area per tower than GSM-based networks.

CSD: Circuit Switched Data. Data available over GSM networks using circuit switched data techniques (analogous to dial-up modems) as opposed to packet switched data techniques (GPRS, analogous to ADSL modems) at a maximum theoretical speed of 9.6KB/s (both uploading and downloading).

HSCSD: High Speed Circuit Switched Data. An enhanced version of CSD, it uses the same circuit switching techniques as CSD but uses different data encoding methods to gain better data rates. Maximum theoretical download speed 43.2KB/s, upload 14.4KB/s.

GPRS: General Packet Radio Service. GPRS is a data network subset of an existing GSM network. Not all GSM networks are enabled for GPRS usage, and GPRS cannot exist on its own. Maximum theoretical download speed of 80KB/s with upload of 20KB/s. Maximum theoretical upload speed of 40KB/s with download of 60KB/s (most common). GPRS is often referred to as a 2.5G network.

EDGE: Enhanced Data rates for GSM Evolution. An enhanced version of GPRS that allows data rates up to a maximum theoretical download speed 236.8KB/s with uploads of 59.2KB/s. Maximum theoretical upload speed of 118.4KB/s with downloads of 177.6KB/s. EDGE is sometimes referred to as 2.75G as it provides speeds between GPRS and W-CDMA.

W-CDMA: Wideband Code Division Multiple Access. One of a few types of 3G network, it works in a similar (but incompatible) way to current CDMA technologies. W-CDMA uses a much larger chunk of the available frequencies to enable much greater data access speeds over CDMA. Often touted as a third generation follow on to the GSM system (hence the term 3G). It forms the basis for the current UMTS and Japanese FOMA network systems.

UMTS: Universal Mobile Telecommunications System. Currently the most common form of 3G network, most of the worlds UMTS networks run on top of W-CDMA as the network access technology. Often referred to as 3GSM to differentiate it from other 3G networks, it allows max theoretical download speeds of up to 384KB/s, with uploads at 64KB/s. The most common UMTS networks run on 2100MHz bands (Australia, NZ, most of Europe and Asia) & 1900MHz (USA and Canada), although some companies have introduced UMTS networks running on 850MHz. Most handsets will only work on one of the two frequencies, although there are an increasing number of handsets that access both.

FOMA: Freedom of Mobile Multimedia Access. The brand name for 3G services offered by Japanese telco NTT DoCoMo, it was the world’s first 3G network it allows similar data access rates to UMTS. Originally FOMA used the same 2100MHz frequency band as UMTS, allowing roaming access for UMTS handsets even though technically the two standards are not 100% compatible. Some rural areas now use the 800MHz band that was traditionally used for 2G PDC services (Japanese equivalent to GSM) making it incomputable with other existing 3G technologies.

HSPA: High Speed Packet Access. Collectively refers to HSDPA (High Speed Downlink Packet Access) and HSUPA (High Speed Uplink Packet Access). HSDPA is to UMTS what EDGE is to GPRS in that it is essentially and enhancement on the existing UMTS technology that allows for download speeds up to a maximum theoretical 14.4MBit/s. HSUPA allows upload speeds up to a theoretical max of 5.76MBit/s.

Evolved HSPA: Evolved High Speed Packet Access. An enhanced version of HSPA that allows for maximum theoretical download speeds of 42MBit/s with uploads of 11MBit/s (similar speeds to current Wi-Fi networks).

WLAN: Wireless Local Area Network. Essentially a wireless version of cabled Local Area Networks, WLAN can provide network access for devices such as laptop computers, mobile phones, VoIP phones, media centre devices etc. WLAN is sometimes incorrectly used synonymously with Wi-Fi, as WLAN provides the underlying network that Wi-Fi runs on (like an inner tube on a water slide; without the water, the inner tube goes nowhere :)). In networking terminology, WLAN provides the “physical layer” whereas Wi-Fi provides the “data link layer”.

Wi-Fi: Also known as IEEE 802.11x, there are a number of differing Wi-Fi standards available today providing differing speeds and ranges. The most common today are 802.11b and 802.11g which allow maximum speeds of 11MBit/s and 54MBit/s respectively, both running at a wireless frequency of 2.4GHz. 11g is backwards compatible with 11b allowing multiple B/G devices in the same network. 802.11n is currently in development allowing speeds of up to 248MBit/s by using multiple-input multiple-output technology (i.e. multiple antennae) running at 5GHz and/or 2.4GHz (depending on the device). Some devices have been produced that already support it (known as pre-n or draft-n devices) however because the standard is still in the draft phase some pre-n devices from differing manufacturers may have issues working together. 802.11n devices are compatible with 11b and 11g when running on 2.4GHz but will fall back to the fastest available speed of the slowest device. Another standard, 802.11a, runs at the same speed of 11g but uses the 5GHz frequency range. It is more reliable and stable, but its range is not as good and is more expensive to implement. 11a is not backwards compatible with other existing standards, however many devices are available that support multiple standards. Most devices available now are classed “a & b/g” compatible, with an increasing number now supporting “pre-n” or “draft-n”.

[brebeatinging]

Thanks for links. ;)

[usha patel]

Hello friends,i hope some body could help me,i have a oem phone from china and the phone works fine but i am having a problem connecting to the internet,my service provider is T-mobile. I when into the GPRS data and installed internet3.voicestream.com as the APN but when i try to connect it comes back as connection failed, is there some other setting that i need to change like WAP data. The name of the phone is Jianeng 269 and it is a PDA . Any help would be greatly appreciated. Thank you. :sad5:

[aarathi]

W-CDMA (Wideband Code Division Multiple Access) is a type of 3G cellular network. W-CDMA is the higher speed transmission protocol used in the Japanese FOMA system and in the UMTS system, an advanced 3G system, designed as a replacement for the ageing 2G GSM networks deployed worldwide.

[puranamravinder]

Check the link:

puranamravinder.blogspot.com

It has a post....Introduction to Mobiles....

That will probably give you some idea and will not confuse you!!

Ravi

[mazed]

good to know - thanks

[april09]

Thanks for sharing. I have this question in my mind for a long time until get the answer here.

[Limlin]

I just saw W995 reviews on google and it says W995 has HSCSD. And your posts explained that and thank you for the sharing!:)