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arXiv 1910.03255eess.SP
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用于TDD系统中超低延迟通信的信道感知稀疏传输

Channel aware sparse transmission for ultra low-latency communications in TDD systems

Wonjun Kim, Hyoungju Ji, Byonghyo Shim

摘要:

超可靠和低延迟通信(URLLC)的主要目标是将延迟降低到毫秒(ms)级别,同时确保传输的可靠性。由于当前的上行链路传输方案需要复杂的握手过程来发起传输,因此满足这种严格的延迟要求是无线系统设计中的挑战。特别地,在时分双工(TDD)系统中,由于移动终端必须等待直到发送方向被切换到上行链路,所以支持URLLC是困难的。在本文中,我们提出了一种新的方法来支持TDD系统中的低延迟接入,称为信道感知稀疏传输(CAST)。该方案的核心思想是将授权信号编码为稀疏向量。这与感测机制保留稀疏向量的能量的事实一起允许我们在CAST解码中使用压缩感知(CS)技术。从性能分析和数值评估,我们表明,所提出的CAST方案实现了显着减少接入延迟超过4G LTE-TDD和5G NR-TDD系统。

英文摘要:

Major goal of ultra reliable and low latency communication (URLLC) is to reduce the latency down to a millisecond (ms) level while ensuring reliability of the transmission. Since the current uplink transmission scheme requires a complicated handshaking procedure to initiate the transmission, to meet this stringent latency requirement is a challenge in wireless system design. In particular, in the time division duplexing (TDD) systems, supporting the URLLC is difficult since the mobile device has to wait until the transmit direction is switched to the uplink. In this paper, we propose a new approach to support a low latency access in TDD systems, called channel aware sparse transmission (CAST). Key idea of the proposed scheme is to encode a grant signal in a form of sparse vector. This together with the fact that the sensing mechanism preserves the energy of the sparse vector allows us to use the compressed sensing (CS) technique in CAST decoding. From the performance analysis and numerical evaluations, we demonstrate that the proposed CAST scheme achieves a significant reduction in access latency over the 4G LTE-TDD and 5G NR-TDD systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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