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Channel Aware Sparse Signaling for Ultra-Low Latency TDD Access

机译：通道感知的稀疏信令，用于超低延迟TDD访问

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摘要

Future mobile communication systems need to support wide variety of new services and applications. In order to support these, ITU-R introduced new types of use cases. One such use case, called ultra reliable and low latency communication (URLLC), concerns the reduction of latency down to a millisecond level while ensuring the reliability of the transmission. In case of uplink transmission, supporting the stringent latency requirement of URLLC is quite challenging due to a time-consuming and complicated handshaking process. In the time division duplexing (TDD) systems, satisfying the latency requirement is far more difficult since the mobile device cannot transmit the data when the subframe is directed to the downlink. In this paper, we propose a new grant signaling scheme, referred to as channel-aware sparse signaling (CASS), to achieve a low latency access in the TDD-based URLLC systems. Key idea of CASS is to map the grant information into a small number of subcarriers and then decode it using a small number of early received samples. From the numerical evaluations, we demonstrate that the proposed CASS scheme achieves significant reduction in access latency over the conventional LTE-TDD systems.
机译：未来的移动通信系统需要支持各种各样的新服务和应用。为了支持这些，ITU-R引入了新类型的用例。一种称为超可靠和低延迟通信（URLLC）的用例涉及将延迟降低到毫秒级，同时确保传输的可靠性。在上行链路传输的情况下，由于耗时且复杂的握手过程，要满足URLLC严格的等待时间要求非常具有挑战性。在时分双工（TDD）系统中，要满足等待时间要求要困难得多，因为当子帧指向下行链路时，移动设备无法发送数据。在本文中，我们提出了一种新的授权信令方案，称为信道感知的稀疏信令（CASS），以在基于TDD的URLLC系统中实现低延迟的访问。 CASS的关键思想是将授权信息映射到少量子载波中，然后使用少量早期接收的样本对其进行解码。从数值评估中，我们证明，与传统的LTE-TDD系统相比，提出的CASS方案可显着降低访问延迟。

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