4g technologymohit

8/7/2019 4G TechnologyMOHIT

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` 1G

` 2G

` 3G

` 4G



` The Core Network

It contains a core IP network that has little

intellegence.Thus, most core functions such as

routing are handled by existing and evolving IPtechnology.



` Above the core is what we call a high level control

layer.It does not provide function for routing or call

pathsetup,unlike the control layer of SS7 in the

PST

N,but leaves it to the core.` It focuses on functions that can be made available

to applications and overlay networks such as

access to decision points for AAA,rule and role

assignment for policy management.



` Finally,the architrcture has an overlay layer that

provides higher layer functionality and support

services for applications such as location services

and content distribution.



` UMTS will be a mobile communications systemthat can offer significant user benefits includinghigh-quality wireless multimedia services to aconvergent network of fixed, cellular and satellite

components.` It will deliver information directly to users and

provide them with access to new and innovativeservices and applications.

` It will offer mobile personalised communications tothe mass market regardless of location, networkand terminal used´.



Multi-media

Multi-environment

Multi-operator



` Two main applications of wimax

` Fixed wimax :it is point to multi point enabling the

delivery of last mile wireless broadband access as

an alternative to cable and dsl for homes andbusiness.

` Mobile wimax: it offers full mobility of cellular

network at true broadband speeds.



` OFDMA

` Using ODFM, it is possible to exploit the time

domain, the space domain, the frequency domain

and even the code domain to optimize radiochannel usage. It ensures very robust

transmission in multi-path environments with

reduced receiver complexity.



` MIMO uses signal multiplexing between multipletransmitting antennas (spacemultiplex) and time or frequency. It is well suited to OFDM, as it is possible toprocess independent time symbols as soon as theOFDM waveform is correctly designed for the channel.This aspect of OFDM greatly simplifies processing.The signal transmitted by m antennas is received by nantennas. Processing of the received signals maydeliver several performance improvements: range,quality of received signal and spectrum efficiency.

` In principle, MIMO is more efficient when manymultiple path signals are received.



` Although the concept of 4G communications showsmuch promise, there are still limitations that must beaddressed. Amajor concern is interoperabilitybetween the signaling techniques that are planned for use in 4G (3XRTT and WCDMA).

` Cost is another factor that could hamper the progressof 4G technology. The equipment required toimplement the next-generation network are still veryexpensive.

` A Key challenge facing deployment of 4G technologies

is how to make the network architectures compatiblewith each other. This was one of the unmet goals of 3G.



` 1. Support for interactive multimedia services liketeleconferencing and wireless Internet.

` 2. Wider bandwidths and higher bitrates.

` 3. Global mobility and service portability.

` 4. Scalability of mobile network.

` 5. Entirely Packet-Switched networks.

` 6. Digital network elements.

` 7. Higher band widths to provide multimediaservices at lower cost(up to 100 Mbps).

` 8. Tight network security



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4g technologymohit

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