Answers are grounded in this paper and cite their sources.
As one of the crucial application scenarios, URLLC (Ultra-Reliable and Low Latency Communication) has been put on the agenda with the development of the 5G communication technology. This paper focuses on the downlink evaluation of shortened TTI (Transmission Time Interval), which is the pivotal characteristic of URLLC. In order to describe the varying control overhead of shortened TTI, we propose a model basing on the traffic arriving rate and the TTI length. What's more, we design a downlink scheduling algorithm to take the impact of shortened TTI into consideration. The system-level simulation verifies that shortened TTI is able to achieve high throughput as well as low latency due to low transmission delay at low system load. However, benefit brought by shortened TTI decreases as the load increases since its higher relative control overhead may lead to non-negligible queuing delay facing high system load. In this situation, system should choose relatively long shortened TTI configurations to reduce the influence of queueing delay.
No takes yet. Share an insight, caveat, or question.
Zhang et al. (2018) studied this question.