4G Communication Technology1

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4G Communication Technology BY Ch Samudraveni 07R21A1242 MLR INSTITUE OF TECHNOLOGY.

Contents: 

Contents Introduction Evolution Architecture Features Future of 4G Conclusion

Introduction: 

Introduction 4G can be defined as MAGIC — M obile multimedia, anytime A nywhere G lobal mobility support, I ntegrated wireless solution, and C ustomized personal service. 4G is used broadly to include several types of broadband wireless access communication systems along with cellular telephone systems. The 4G systems not only will support the next generation of mobile service, but also will support the fixed wireless networks. The approaching 4G (fourth generation) mobile communication systems are projected to solve still-remaining problems of 3G (third generation) systems.

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The 4G systems will interoperate with 2G and 3G systems, as well as with digital (broadband) broadcasting systems and IP-based one. The 4G infrastructure consists 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. 4G Technology is to provide a wide variety of new services, from high-quality voice, high-definition video, high-data-rate wireless channel. 4G mobile data transmission rates are planned to be up to 20 megabits per second. Different multiple access techniques like TDMA, FDMA, CDMA are the various fields that are being explored to improve the utility of 4G systems.

Evolution: 

Evolution 1G 1G was based on analog technique and deployed in the 1980 s. It built the basic structure of mobile communications and solved many fundamental problems. Speech chat was the only service of 1G. 2G 2G was based on digital signal processing techniques and regarded as a revolution from analog to digital technology, which has gained tremendous success during 1990s with GSM as the representative. 2.5G 2.5G extended the 2G with data service and packet switching methods, and it was regarded as 3G services for 2G networks. Under the same networks with 2G, 2.5G brought the Internet into mobile personal communications. This was a revolutionary concept leading to hybrid communications.

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3G 3G is deploying a new system offer multimedia transmission, global roaming across a cellular or other single type of wireless network, and bit rates ranging from 384 Kbps to 2Mbps. The limitations and difficulties of 3G include: Limitation of spectrum and its allocation. Difficult to roam across distinct service environment in different frequency bands. Lack of end-to-end seamless transport mechanism spanning a mobile sub-network and a fixed one. However, the demand for higher access speed multimaedia communication in today's society and the limitations of 3G communication service wave the path for 4G mobile communication.

Architecture of 4G: 

Architecture of 4G There are three possible architectures for 4G. Multimode devices Overlay network Common access protocol. Multimode devices: This architecture uses a single physical terminal with multiple interfaces to access services on different wireless networks. It may improve call completion and expand effective coverage area. It should also provide reliable wireless coverage in case of network, link, or switch failure. The user, device, or network can initiate handoff between networks. The device itself incorporates most of the additional complexity without requiring wireless network modification or employing inter working devices. Each network can deaploy a database that keeps track of user location, device capabilities, network conditions, and user preferences.

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Overlay network : In this architecture, a user accesses an overlay network consisting of several universal access points. These UAPs in turn select a wireless network based on availability, QoS (Quality of Service) specifications, and user defined choices. A UAP performs protocol and frequency translation, content aadaptation , and QoS negotiation-renegotiation on behalf of users. The overlay network, rather than the user or device, performs handoffs as the user moves from one UAP to another. A UAP stores user, network, and device information, capabilities, and preferences. Common access protocol : This protocol becomes viable if wireless networks can support one or two standard access protocols. One possible solution, which will require inter working between different networks, uses wireless asynchronous transfer mode. To implement wireless ATM, every wireless network must allow transmission of ATM cells with additional headers or wireless ATM cells requiring changes in the wireless networks.

4G Features: 

4G Features High usability: anytime, anywhere, and with any technology. 4G networks are all-IP based heterogeneous networks that allow users to use any system at any time and anywhere. Support for multimedia services at low transmission cost. Personalization, integrated services Entirely packet switched networks. All network elements are digital. Higher bandwidth, tight network security. with the expected growth in Internet Opening new spectrum frontiers 4G networks expected to support real-time multimedia services that are highly time-sensitive .

Future of 4G: 

Future of 4G “The future of wireless is not just wireless, it is a part of life.” The future offers faster speeds and larger bandwidth. It is suggested that 4G technologies will allow 3D virtual reality and interactive video / hologram images. The technology could also increase interaction between compatible technologies, so that the smart card in the handset could automatically pay for goods in passing a linked payment kiosk (I-mode can already boast this capability) or will tell your car to warm up in the morning, because your phone has noted you have left the house or have set the alarm. 4G is expected to provide high-resolution images (better quality than TV images) and video-links (all of these will require a band width of about 100MHz). It is likely that the forecasts of the next 'Killer Apps' for 4G technology will change as customer demand develops over time.

Conclusion: 

Conclusion Low cost high speed data will drive forward the fourth generation (4G) as short-range communication emerges. Service and application ubiquity, with a high degree of personalization and synchronization between various user appliances, will be another driver. It is probable that the radio access network will evolve from a centralized architecture to a distributed one. 4G is likely to enable the download of full length songs or music pieces which may change the market response dramatically. We hope that future generations of wireless networks will provide virtually unlimited opportunities to the global, connected community. Innovations in network technology will provide an environment in which virtually anything is available, anywhere, at any time, via any connected device.

References: 

References www.4g.co.uk www.wikipedia.com www.google.co.in

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