31-03-2011, 11:27 AM
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Future Wireless Communication System: Towards to 4G
Evolution towards to 4G
• The growth of number of mobile subscribers
• Why mobile subscribers are increasing ?
• Movement from the Personal Computing Age (one computing device per person) to Ubiquitous Computing Age (several platforms at user’s request whenever and wherever needed)
The convergence of media
• Numerous demanding of multimedia applications arose from huge number of personal wireless devices, which are small, cheap, more convenient and more powerful.
• Road map of wireless communication systems
Key Concept of 4G
• Global wireless communication system
• All-IP based seamless connectivity
• 4G is foreseen as an integrator of all existing and future wireless and wired networks, both terrestrial and satellite.
• 4G is not a new system design from scratch but 4G is a concept of integration and convergence
4G systems will deliver
• All digital all-IP communication
• End-to-end QoS guarantees
• Efficient spectrum sharing and dynamic spectrum allocation
• Diversified radio access (e.g. cellular, WLAN, ad hoc networks)
• Adaptive multimode user terminals (cognitive approach)
• Seamless and transparent user roaming with fully support of various handovers.
• Support for huge multimedia traffic
• Integration of navigation and communication system in order to offer a variety of location/situation/context aware service
• Increased level of security
• Increased personalization
• Quickly deployable user services (anytime, anywhere, and from any device) in cost effective manner
• All-IP based 4G network
• Research Challenge in Future Wireless Communication Systems
Crucial issues needed to be investigated are
– User terminals issue
– Mobile Services issue
– Access network issue
– Communication issue
• Spectrum efficiency and channel capacity
• Provisioning of ubiquitous coverage
• Cost-effective solution for high data rates
• Increased bandwidth usability
• Efficient spectrum allocation by using cognitive approach
• Spectrum sharing of cognitive radios
• Emerging paradigm of cognitive network
• IEEE 802.21 framework of Multimedia Independent Handover- Network
• IEEE 802.21 framework of Multimedia Independent Handover - User
Conclusion
• The 4G paradigm is already on the road.
• 4G wireless system provide high speed, high capacity, low cost per bits.
• 4G is IP-based services for broadband multimedia.
• Concept of 4G is all about an integrated, global network based on open system approach.
• 4G wireless systems utilize spectrum efficiently via cognitive approach, and optimize the choice of radio access technology.
• Cognitive radio and networking will become the key in reconfigurable wireless system.
