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The Cautious Road Beyond 3G
- Wireless Systems Beyond IMT-2000
- Fourth-generation mobile communications (4G mobile)
- The converged broadband wireless system (wireless mobile and wireless access)
- Spectrum efficiency
- Dynamic bandwidth allocation
- Secured wireless application
- Improved quality of service
What is 4G Wireless?
- The Way to the 4G
- 4G Characteristics
- 4G Definitions
- 4G Multiple Access
- Orthogonal Frequency Division Multiplexing and MC CDMA.
- Ultra Wide Band Radio
- Network building blocks
- Quality of Service
- Packet switched/IP Multimedia
4G Around the World
- A critical view on Roadmaps for the Future of Wireless Access
- Standardization bodies
- Licenses
- Implementations
Features of 4G Wireless Systems
- Adaptive Modulation and Coding
- Speed, capacity and cost per bit
- Global mobility
- Service portability
- Scalable mobile networks
- Seamless switching
- Quality of Service (QoS) requirements
- Scheduling and call admission control techniques
- Ad hoc networks and multi-hop networks
What's New in 4G
- New Services
- What is a 4G mobile service?
- Expected 4G services
- Media-Rich Apps
- Who provides services?
- 4G business model and potential services and applications
- The wireless world beyond third generation
- The evolution of 3G networks towards 4G mobile communications
- 4G Networks Overlay
- Location Services (LCS) in 4G Networks.
- Channel Modeling and Measurements for 4G
- Adaptive 4G Networks
Challenges in 4G
- Multi-access interface, timing and recovery
- Higher frequency reuse
- Issues in the interface with the ad hoc networks
- Voice over multi-hop networks
- Security
- Variable QoS services
- Changing channel conditions
- Seamless roaming
- Seamless transfer of services
Radio Theory
- Problems in a cellular system
- Near-far problems
- Interference
- Multipath fading
- Shadowing
- Specific solutions in 4G
- Cell Planning
- Fast power control
- Radio planning aspects of 4G
- Handover
- Bit rate
4G Radio Interface
- Different access techniques
- Global roaming
- The terminals
- Software radio approach
- What is multicarrier modulation (MCM)?
- OFDMA
- WOFDM
- MC-CDMA
- Ultra Wideband technology in 4G
- Fair packet loss sharing (FPLS) packet scheduling for 4G wireless
- MAC protocol time-division and code-division multiplexing
- 4G processing
- Receiver section
- Transmitter section
- Ultrawideband (UWB) parameters and characteristics
- Interference results
OFDM Characteristics
- High peak-to-average power levels
- orthogonality in severe multi-path
- Efficient FFT based receiver structures
- Efficient TX and RX diversity
- Adaptive antenna arrays without joint equalization
- Support for adaptive modulation by subcarrier
- Frequency diversity
- Robust against narrow-band interference
- Efficient for simulcasting
- Variable/dynamic bandwidth
- Why is used for highest speed applications
- Supports dynamic packet access
4G Network Architecture
- Access
- Handoff
- Location coordination
- Resource coordination to add new users
- Support for multicasting
- Support for quality of service
- Wireless security and authentication
- Network failure and backup
- QoS
- Operation Support Systems
- Pricing and billing
Possible Architectures
- How to access several different mobile and wireless networks
- Three possible architectures
- Overlay network
- Common access network
- Multimode devices
- Multiplexing of heterogeneous traffic
- Resource Allocation
- Multiple information bearing data rates (> 2 Mbps)
- QoS guarantee (bit error rate, delay, power/spectral efficiency)
- Cell coverage environment (indoor, outdoor, local and wide area)
- Flexibility and efficiency in channel assignment and scheduling
- Complexity and power consumption of a transceiver
Backbone network infrastructure
- Convergence
- Infrastructure link to the last mile
- Flow control at access points/network edges
- Packet routing
- Native-mode ATM, TCP/IP, mobile IP
- End-to-end QoS control: minimum bandwidth guarantee
- Integration with various application-specific networks: interworking
- Higher Layer Issues in 4G
- Management, Congestion control,and QoS Guarantees :
- Mobility Management
- Mobility Management includes location registration, paging and handover.
- Congestion Control
- Avoidance or prevention of the congestion
- Detection and recovery after congestion
Physical and MAC Layer issues in 4G
- Summary of higher layer issues in 4G
- Fast Fourier transform (FFT) techniques
- Peak-to-average ratio (PAVR) of the signal
- Some new challenges in the lower layer
- Physical and MAC Layer specifications
- Multi-carrier modulation
4G mobile QoS
- open multiple air interfaces
- The real-time services
- Guaranteed
- Better-than-best effort
- Predictive
- Controlled delay
- Controlled load
- Guaranteed and Controlled Load services
- Mixed QOS requirements for 4G
- Web data (real-time/non real-time, microflows)
- Continuous media (mostly real-time)
- TCP data (bursty best effort)
- IP Micro-mobility access networks
- Mobile ad hoc networks
- Sensor and deeply embedded networks
- Quality of Service Challenges
- Varying bit rate
- Channel characteristics
- Bandwidth allocation
- Fault tolerance
- Handoff support among heterogeneous wireless networks
4G Security Issues
- Security issues beyond 3G
- Encryption techniques
- Authentication and authorization functions
4G mobile Case Study: MOTO-Media
- The Evolution of TDMA to W-CDMA & 4G Wireless Systems
- What is MOTO-Media?
- Implementation Issues
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