01-06-2012, 04:31 PM
4G-MOBILE COMMUNICATION USING WIRELESS COMMUNICATION
4G-MOBILE COMMUNICATION USING WIRELESS COMMUNICATION...doc (Size: 416 KB / Downloads: 84)
INTRODUCTION
We are seeing a massive demand for data, audio, image and video services on mobile phones. These require a faster rate of data transfer.
Though the projected data rate of 3G is around 2 Mbps, the actual data rate is much slower, especially in crowded areas or when the network is congested. Further, data rates also depend on the user’s activity (moving or steady state) and location (indoor/outdoor).
As expected data services like multimedia are going to play an increasing role and will dominate the cellular traffic instead of voice in future.
In such a scenario, the present 2G and 3G systems will saturate and have no room to survive. Also, the demand for increasing data rates leads to higher bandwidth requirements. These factors force the cellular industry to develop a common standard or system that over comes almost all limitations imposed by previous cellular technologies.
What is 4G?
the concept of 4G cellular network. The future 4G infrastructure will consist of various networks using Internet Protocol (IP) as a common protocol. So the users will be in control as they can choose every application and environment. Accessing information any where, in time with seamless connections to a wide range of information, data, pictures, video and so on will be the benefits of 4G infrastructure.
4G: Edge over 3G:
It is commonly said that 4G is the super- enhanced version of 3G.4G systems will be deployed with software –defined radios, allowing equipment upgrades for new protocols and services via software upgrades. In addition, 4G holds the promise of worldwide roaming using a single handheld device. To summarise,4G means fully converged services, ubiquitous cellular access, diverse user devices, autonomous networks and software dependency.
The main aim of 3G was to provide multimedia, multirate, cellular communications any time and any where. It’s uneconomical to meet this requirement with only cellular radio.4G systems will extend the scenario to an IP network that integrates broadcast, cellular radio.4G systems will extend the scenario to an IP network that integrates broadcast ,cellular , cordless ,WLAN/PAN and fixed wire.
FEATURES OF 4G:
4G is the Fourth Generation Wireless Network Communications Technology standard. When implemented, users of 4G devices will have the ability to access to applications ranging from basic voice communications to seamless real-time streaming video. Although it is in the research and development stage, 4G is expected to be globally available to the public between 2006 and 2010.
VISIONS OF 4G
This new generation of wireless is intended to complement and replace the 3G systems, perhaps in 5 to 10 years. Accessing information anywhere, anytime, with a seamless connection to a wide range of information and services, and receiving a large volume of information, data, pictures, video, and so on, are the keys of the 4G infrastructure. The future 4G infrastructures will consist of a set of various networks using IP (Internet protocol) as a common protocol so that users are in control because they will be able to choose every application and environment.