Air Interface Requirements for Mobile Data Services

Harald Haas, International University Bremen

Introduction

Spectral Efficiency and Interference

System Requirements

Multiuser Access

Duplexing

Link Adaptation

Radio Resource Management

Interference Considerations

DCA Algorithms

MAC Protocols

Packet Scheduling

Summary and Conclusion

Glossary

Cross References

References

INTRODUCTION

Current interest in wireless and cellular communications is aimed at high-speed data transmission. The fundamental system enhancements being developed will lead to many new mobile data services. Many different standards and systems have already appeared for cellular networks, wireless metropolitan area networks (MANs), wireless local area networks (WLANs), and personal area networks (PANs). Typical representatives, in the same order, are UMTS (universal mobile telecommunication system; http://www.umtsforum.org); WiMAX (http://www.wimaxforum.org, worldwide Interoperability for Microwave Access) standard, based on IEEE 802.16; and Wi-Fi (wireless fidelity) standard, based on IEEE 802.11 and Bluetooth. Although MANs, WLANs, PANs, and so forth are gaining significant momentum, cellular systems still offer the highest degree of mobility. Although cellular systems are the main carriers for mobile data services, mobile data services impose heavy demands on cellular systems, in particular with respect to security. For instance, if international roaming, such as in global standard for mobile communication (GSM), ...

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