Home
Computers & Networking
Cellular Phones
Mobile Phone Operating Systems

Cellular Wireless Network Technologies: Cdma, Gsm, Cdma Iden

i. BlackBerry^® Map Display -Access maps, zoom in for a closer look, and plan your route faster than you could before. You can also place your cursor over an unlabeled street to make the name pop up. Automatic Address Detection - Simply click on an address is displayed in an email or on a web page to view the location with BlackBerry Maps. Points of Interest - View points of interest like hotels, restaurants, and shopping centers, get directions from one to the other, and see ratings and reviews all on BlackBerry Maps.

1.2.f Bada OS

Bada is a mobile operating system being developed by Samsung Electronics for use on mobile phones, ranging from low-end feature phones to high-end smartphone. Native applications are developed in C++ with the Bada SDK, and the Eclipse based integrated development environment (IDE).

Bada fully utilizes the power of hardware for the ultimate application experience. Even with mid-range or cost-effective models, it also provides powerful features for better application experiences.

Features such as plenty of UI controls, Flash support, sensors support help applications to be more interactive. Service-centric features such as in-app-purchasing, SNS integration help applications to offer customers a richer, more interactive experience.

2. Wireless Network Technologies

2.1 GSM (Global System For Mobile Communication)

It is a 2G technology, and is a standard for digital cellular telephone service. GSM is the most widely used of the three digital wireless telephone technologies (TDMA, GSM and CDMA), widely used in most parts of the world, including developing countries like Afghanistan (Eshan Bayat Foundation Telephone Systems International), Namibia (Orascom Telecom Holding) and Belize (Digicell). GSM supports voice, data, text messaging and cross-border roaming. The SIM (Subscriber Identification Module), a removable plastic card that contains a users data, is an essential element in a GSM network.

GSM operates in multiple frequency bands, GSM 900, GSM 1800, GSM 1900. When GSM is working on a radio frequency of 1800 MHz, it is sometimes referred to as DCS 1800, GSM1800 or PCN.

GSM networks are excellent for voice calls; they are limited when it comes to sending and receiving data. GSM phones use a technology called CSD (Circuit Switched Data) to transfer data. CSD requires the phone to make a special connection to the network before it can transfer data (like making a voice call), which can take up to 30 seconds. Once connected, the data is sent or received and the user is billed for the time spent online.

2.2 CDMA (Code Division Multiple Access)

It is a digital cellular technology that uses spread-spectrum techniques. Unlike competing systems, such as GSM, that use TDMA, CDMA does not assign a specific frequency to each user. Instead, every channel uses the full available spectrum. Individual conversations are encoded with a pseudo-random digital sequence. CDMA consistently provides better capacity for voice and data communications than other commercial mobile technologies, allowing more subscribers to connect at any given time, and it is the common platform on which 3G technologies are built.

2.3 CDMA iDEN (Integrated Digital Enhanced Network)

A wireless communications technology from Motorola that provides support for voice, data, short messages (SMS) and dispatch radio (two-way radio) in one phone. Operating in the 800MHz and 1.5GHz bands and based on TDMA, iDEN uses Motorola's VSELP (Vector Sum Excited Linear Predictors) vocoder for voice compression and QAM modulation to deliver 64 Kbps over a 25KHz channel. Each 25KHz channel can be divided six times to transmit any mix of voice, data, dispatch or text message. Used by various carriers around the globe, Nextel Communications provides nationwide coverage in the U.S.

One feature of iDEN technology that many users like is its use of a SIM (Subscriber Identification Module) just as GSM phones do. Should you switch from iDEN to GSM, your SIM card, containing your entire phone book and contact information, can often be used in your new GSM phone to eliminate the tedious re-entry of your saved data.