Since the advent of mobile devices, both end-users and the IT industry have been longing for direct device-to-device (D2D) communication capabilities, expecting new kinds of interactive, personalized, and collaborative services. Fifteen years later, many D2D solutions have been implemented and deployed, but their availability and functionality are underwhelming. Arguably, the most widely-adopted D2D use case covers the pairing of accessories with smartphones; however, many other use cases-such as mobile media sharing-did not progress. Pervasive computing and cyber-physical convergence need local communication paradigms to scale. For inherently local use cases, they are even more appealing than ever: eschewing third-parties simultaneously fosters environmental sustainability, privacy and network resiliency. This paper proposes a survey on D2D communication, investigates its deployment and adoption, with the objective of easing the creation and adoption of modern D2D frameworks. We present the results of an online poll that estimates end-users' utilisation of D2D processes, and review enabling technologies and security models.

翻译：自移动设备问世以来，终端用户与信息技术行业一直期待实现直接的设备间（D2D）通信能力，以期催生新型交互式、个性化与协作式服务。十五年后，众多D2D解决方案已得到实施与部署，但其可用性与功能性仍不尽如人意。可以说，最广泛采用的D2D应用场景涵盖配件与智能手机的配对，然而许多其他场景（如移动媒体共享）并未取得进展。普适计算与物理-信息融合需要本地通信范式以实现扩展。对于本质为本地化的应用场景而言，此类通信范式比以往更具吸引力：规避第三方同时促进了环境可持续性、隐私保护与网络韧性。本文提出D2D通信综述，研究其部署与应用现状，旨在简化现代D2D框架的创建与推广。我们展示了一项在线调查的结果，该调查评估了终端用户对D2D流程的利用情况，并梳理了支持技术与安全模型。