Terminal Layer Mapping for Multi-Codeword PUSCH Transmission
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Solution Overview
Problem
Current radio communication systems, particularly in future generations like NR, face challenges in effectively transmitting multiple codewords over the Physical Uplink Shared Channel (PUSCH) due to insufficient understanding of layer mapping, precoding, and generation processes, leading to potential throughput decreases and communication quality deterioration.
Innovation Solution
A terminal and radio communication method that includes a receiving section for scheduling multiple codewords on a physical uplink shared channel using single downlink control information and a control section for layer mapping based on the number of layers indicated by the precoding and number of layers field in the downlink control information, ensuring appropriate PUSCH transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple codewords are transmitted using PUSCH, then data rate and throughput are improved, but layer mapping and precoding control become complex and insufficiently studied
Solution Approach 1:
The patent applies parameter changes by utilizing the precoding and number of layers field in DCI to dynamically control the number of layers for multiple codeword transmission. This allows the system to adapt the layer mapping configuration based on channel conditions and traffic requirements, resolving the complexity issue by providing clear parameter-based control rules for multi-CW PUSCH transmission
2Loss of information
If multiple codewords are scheduled by single DCI, then signaling efficiency is improved, but communication quality may deteriorate due to insufficient study on transmission details
Solution Approach 1:
The patent implements feedback mechanisms where the base station provides DCI with precoding and number of layers field information to control the UE's layer mapping. This feedback loop ensures that the UE can appropriately map multiple codewords to the correct number of layers, maintaining communication quality while achieving signaling efficiency through single DCI scheduling
3Device complexity
If layer mapping is not properly controlled for multiple codewords, then device complexity is reduced, but throughput decreases and communication quality deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-defining the layer mapping rules based on the precoding and number of layers field in DCI. The UE uses this pre-specified information to automatically determine the correct layer mapping configuration for multiple codewords, eliminating the need for complex real-time decisions while ensuring optimal throughput and communication quality
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives information indicating that a plurality of codewords including a first codeword and a second codeword are scheduled for a physical uplink shared channel by single downlink control information; and a control section that performs control to map the plurality of codewords on a layer corresponding to a number of layers indicated by a precoding and number of layers field of the downlink control information. According to one aspect of the present disclosure, it is possible to appropriately perform PUSCH transmission.