Reference Signal Positioning for Split NR Repetition Transmission
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Solution Overview
Problem
In the context of New Radio (NR) systems, there is a lack of clear guidance on how to split demodulation reference signals (DMRS) when a transmission repetition is split into multiple repetitions, leading to inconsistent understanding between network devices and terminal equipment, which affects the reliability and latency of low-latency and high-reliability services.
Innovation Solution
A method and apparatus for transmitting reference signals, where the position of the reference signal is determined based on time-domain resource segments, ensuring consistent understanding between network devices and terminal equipment, thereby improving transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If one repetition is split into multiple repetitions to reduce transmission latency, then transmission latency is reduced, but it becomes unclear whether the DMRS needs to be split and how it can be split, leading to inconsistent understanding between network devices and terminal equipment
Solution Approach 1:
The patent applies segmentation by dividing the reference signal transmission into multiple time-domain resource segments corresponding to split repetitions. Each segment contains appropriately positioned reference signals, allowing the original repetition to be divided into multiple smaller transmission units while maintaining reference signal integrity and enabling consistent understanding between network devices and terminal equipment.
2Loss of time
If multiple repetitions are transmitted in one slot to reduce transmission latency, then transmission latency is reduced, but the position of reference signals in split repetitions becomes undefined
Solution Approach 1:
The patent applies preliminary action by pre-defining reference signal positioning rules within each time-domain resource segment before transmission occurs. The method establishes clear guidelines for placing reference signals in split repetitions, eliminating the need for complex real-time calculations and ensuring consistent understanding between network devices and terminal equipment.
3Reliability
If repetition transmission is used to improve transmission reliability, then transmission reliability is improved, but transmission latency increases
Solution Approach 1:
The patent applies dynamics by making the reference signal positioning adaptive to the specific time-domain resource segment characteristics. The method dynamically adjusts reference signal placement based on the segment structure created by splitting repetitions, allowing the system to maintain reliability through multiple transmissions while minimizing latency by optimizing reference signal positions in each segment.
Data Source
AI summary
A terminal equipment includes: a receiver configured to: receive a first signal including a first parameter configuring or indicating one or more repetition, and receive a second signal including downlink control information indicating a first repetition or a second repetition, the first repetition being a repetition of slot level, the second repetition being a repetition of symbol level; and a transmitter configured to transmit, according to the first parameter and downlink control information, one or more actual repetitions corresponding to the same transport block in one or more time-domain resource segments in which the one or more actual repetitions are located, each of the one or more actual repetitions comprising a data channel and a reference signal.