Wireless Connectivity for Internet of Things (IoT)

除了未来无线网络(5G)对无线连接的传统要求，即对更高的比特率、更广泛的融合和更低的延迟的日益增长的需求外，5G网络还有一些新的具有挑战性的要求。特别是，下一代移动网络联盟预测，5G网络将需要满足一个新的用例，即所谓的物联网(IoT)的需求。物联网是一种新的网络模式，其中为对象或人提供了唯一的标识符，并能够在不需要人与人或人与计算机交互的情况下通过网络传输数据。换句话说，物联网是嵌入了电子、软件、传感器和连接的物理对象或事物的网络，使其能够通过互联网基础设施与其他机器和/或人类交换数据。据估计，到2020年，物联网将由近500亿个对象组成。特别是，5G系统应该支持数十万个同时连接，以进行大规模的传感器部署。无线技术在过去几十年中发生了重大变化；然而，当前的系统远远不能满足预计的未来需求。研究内容包括：(1)超低延迟(&lt；1ms)、低频谱利用率、超可靠(无ARQ)传输。(2)频谱和能量高效、超可靠传输(无重传)。(3)下行链路和上行链路高速、非协调多址接入，开销小。(4)超高能效传输，即在能量与频谱效率之间有效权衡的可能性。(5)支持上行链路、下行链路和协作传输中的开环操作。(6)在上行链路/下行链路中支持非协调、低等待时间的多址接入；(7)分组级别的纠错。建议的研究依赖于跨层方法，包括射频/物理层和网络层来应对这些挑战。

In addition to conventional requirements for wireless connectivity in future wireless networks (5G), which is a growing demand for higher bit rates, wider converge and lower latency, 5G networks have some new challenging requirements. In particular, Next Generation Mobile Networks Alliance predicts that 5G networks will need to meet the need of a new use-case, the so-called Internet of Things (IoT). The IoT is a new networking paradigm in which objects, or people are provided with unique identifiers and the ability to transfer data over a network without requiring human-to-human or human-to-computer interaction. In other words, IoT is the network of physical objects or "things" embedded with electronics, software, sensors and connectivity to enable it to exchange data with other machines and/or humans through the Internet infrastructure. It is estimated that the IoT will consist of almost 50 billion objects by 2020. In particular, 5G systems should support several hundreds of thousands of simultaneous connections for massive sensor deployments. Wireless technology has evidenced significant changes in the last decades; however, the current systems are far from meeting the projected future demands. The proposed research addresses some of the key questions in conjunction with the realization of IoT wireless connectivity.The proposed research includes: (1) Extra low latency (< 1msec), low spectral efficiency, ultra-reliable (no ARQ) transmission. (2) Spectral and energy efficient, ultra-reliable transmission (no retransmission). (3) High speed, uncoordinated multiple access in down-link and up-link with small overhead. (4) Ultra energy efficient transmission, i.e., possibility to effectively trade-off of energy vs. spectral efficiency. (5) Support for open loop operation in up-link, down-link, and in cooperative transmission. (6) Support for uncoordinated, low latency multiple access in up-link/down-link, (7) Error correction at the packet level. The proposed research relies on a cross layer approach, including RF/PHY and network layers to address these challenges.