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In this paper, we describe the design and implementation of D2D communicationfunctionality for LTE. To our knowledge, this is the first such implementationthat is compliant with the LTE Release 12 standard. In this paper, we designand demonstrate an experiment on mode selection between infrastructure mode andD2D communication mode in LTE networks. We implement our system on asoftware-defined radio SDR testbed, augmenting the open-source LTE eNodeB andUE implementation provided by the srsLTE software suite. Our measurementsdemonstrate the cell extension capabilities of D2D and quantify the SNR andthroughput obtained by a subscriber when directly served by the eNodeB and whenprovided connectivity through the relay UE. Our implementation of sidelink,relaying, and mode selection functionality enables experimentation andprototyping of D2D communication that can assist in standardization, research,and development.

LTE Standard-Compliant D2D Communication: Software-defined Radio Implementation and Evaluation