This SpringerBrief focuses on crucial issues for device-to-device (D2D)
communications within the rapidly expanding 4G LTE toward 5G system.
Several critical technical challenges in D2D communications are
discussed, and D2D standardization activities in 3GPP are provided.
Topics range from proximity discovery and mode selection, to resource
management. The authors investigate proximity detection solutions for
enabling direct user equipment communication by listening to uplink
transmission. The problem of mixed mode selection is demonstrated to
meet multiple quality of service (QoS) requirements in D2D enabled
cellular networks. Finally, the brief explores the problem of designing
interference-constrained resource allocation to pair cellular user
resources with potential D2D links in cellular D2D underlay, with the
goal of improving spectrum efficiency. Device-to-Device Communications
in Cellular Networks targets researchers and professionals working in
wireless communications and networks. Advanced-level students in
electrical engineering and computer science studying wireless
communications and networks can also use this material as a study
guide.