Device-to-Device (D2D) communications will play an important role in the fifth generation (5G) cellular networks, by increasing the spatial reuse of spectrum resources and by enabling communication links with low latency. D2D is composed of two fundamental building blocks: proximity discovery and direct communication between nearby users. Another emerging trend in wireless cellular systems is Machine-to-Machine (M2M) communications, often characterized by fixed, low transmission rates. In this chapter we motivate the synergy between D2D and M2M, and present technologies that enable M2M-via-D2D communication to operate as an underlay to the ordinary cellular transmissions.

Chapter Contents:

• Abstract
• 6.1 Introduction
• 6.1.1 Key concepts in D2D communication
• 6.1.2 How can D2D help MTC?
• 6.1.3 Chapter organization
• 6.2 Underlay D2D links
• 6.2.1 Underlay signal model
• 6.2.2 Optimal underlay decoding
• 6.2.3 Sub-optimal underlay decoding
• 6.3 Underlay proximity discovery
• 6.3.1 Network-controlled proximity discovery overview
• 6.3.2 System model
• 6.3.3 Analysis
• 6.3.3.1 Single monitoring device
• 6.3.3.2 Multiple monitoring devices
• 6.3.3.3 Choice of downlink channel to underlay
• 6.3.3.4 Orthogonal downlink power control
• 6.3.4 Numerical results and discussion
• 6.3.5 Remarks
• 6.4 Underlay direct communications
• 6.4.1 Analysis of topology A
• 6.4.2 Analysis of topology B
• 6.5 Conclusion
• Acknowledgements
• References

Inspec keywords: machine-to-machine communication; cellular radio; 5G mobile communication; radio links

Other keywords: communication links; wireless cellular systems; 5G cellular networks; fifth generation cellular networks; M2M communication; wireless device-to-device links; spectrum resources; D2D links; machine-to-machine communication; proximity discovery; spatial reuse; ordinary cellular transmissions

Subjects: Mobile radio systems