Terminal Apparatus Intra-Slot PUSCH Repetition Mapping
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Solution Overview
Problem
In the context of 5G NR Rel-16, achieving higher reliability and lower latency in communications is challenging due to the lack of detailed proposals for signal repetition within a slot, and there is a need for a control method that defines control signals between terminal and base station apparatuses.
Innovation Solution
A terminal apparatus configured with a receiver for communication, including a controller that divides a slot into sections, maps demodulation reference signals, and generates PUSCHs based on parameters related to frequency hopping and redundancy versions, allowing for intra-slot repetition and flexible mapping of signals to improve reliability and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal repetition in a slot is implemented to improve reliability, then transmission reliability is improved, but device complexity increases due to lack of detailed proposals requiring new control methods
Solution Approach 1:
The patent makes the existing DMRS mapping mechanism universal by enabling it to function in both frequency hopping and PUSCH repetition scenarios. The controller applies the same mapping criteria (based on OFDM symbol positions and frequency hop patterns) to different transmission modes, eliminating the need for separate control mechanisms and reducing overall system complexity while achieving reliable repeated transmissions.
Solution Approach 2:
The patent segments the slot into multiple sections based on frequency hop points and maps DMRS independently to each section. This segmentation allows the system to handle repetition transmissions by dividing the transmission into manageable segments (hops) that can be processed using standardized mapping rules, reducing control complexity.
2Reliability
If intra-slot frequency hopping is configured to improve reliability through diversity, then transmission reliability is improved, but the number of OFDM symbols available for data transmission decreases
Solution Approach 1:
The patent optimizes the mapping parameters by calculating DMRS positions based on the actual OFDM symbol indices within each hop section. By dynamically adjusting the mapping parameters according to the hop configuration and available symbols, the system achieves frequency diversity while maximizing the utilization of available time-frequency resources for data transmission.
3Loss of time
If PUSCH repetition is enabled to achieve lower latency, then transmission latency is reduced, but device complexity increases due to need for separate control signaling
Solution Approach 1:
The patent creates a universal control mechanism where the same higher layer parameters and mapping criteria are used for both frequency hopping and PUSCH repetition. The controller interprets the configuration parameters (such as dmrs-TypeA-Position, frequency hop patterns) in a unified manner that works for both transmission modes, eliminating the need for separate control signaling and reducing device complexity while enabling low-latency repetition transmissions.
Data Source
AI summary
Repeated transmission in a slot is efficiently performed with less control information. In a case that a parameter related to frequency hopping is configured to intra-slot hopping, a slot is divided into a first section and a second section and at least one demodulation reference signal is mapped to each of the first section and the second section. In a case that a parameter related to PUSCH repetition in a slot is enabled, a first section and a second section are generated according to a criterion identical to a criterion used in a case that information related to the frequency hopping is enabled, at least one demodulation reference signal is mapped to the first section and the second section, two PUSCHs generated from a same transport block are generated, and the two generated PUSCHs are mapped to the first section and the second section.