Multi-Slot PUSCH Coding Rate and DMRS Mapping
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Solution Overview
Problem
Existing communication systems in LTE and NR face challenges in efficiently managing the scheduling and transmission of PUSCH (Physical Uplink Shared Channel) to optimize coding rates and DMRS (Demodulation Reference Signals) for improved communication efficiency.
Innovation Solution
The terminal and base station apparatuses implement specific configurations for receiving and transmitting DCI formats to manage PUSCH and DMRS in multiple slots, determining coding rates and DMRS patterns based on higher layer signaling, DCI formats, and slot indices to optimize communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the target coding rate is set to 1 or greater for PUSCH transmission in multiple slots, then the data transmission capacity is improved, but the effective coding rate becomes 1 or less which may compromise transmission reliability
Solution Approach 1:
The patent implements dynamic coding rate adjustment by allowing the target coding rate to vary across different slots based on channel conditions and traffic requirements. The system can adaptively select coding rates from a range (including values >=1 for high capacity and values <=1 for reliability) to optimize the trade-off between productivity and reliability in real-time
Solution Approach 2:
The patent changes the coding rate parameter dynamically by introducing a mechanism where the target coding rate can be set to different values (>=1 or <=1) depending on the specific transmission requirements. This parameter flexibility allows the system to switch between high-capacity mode and high-reliability mode as needed
2Measurement precision
If DMRS is mapped to all multiple slots for PUSCH transmission, then the demodulation accuracy is improved, but the overhead and resource consumption increase
Solution Approach 1:
The patent applies local quality by mapping DMRS selectively to specific slots rather than uniformly to all slots. The system identifies which slots require DMRS based on local channel conditions, data importance, or interference levels, and maps DMRS only to those specific slots where it is most beneficial, thereby reducing overall overhead while maintaining necessary demodulation accuracy
Solution Approach 2:
The patent implements partial action by mapping DMRS to only a subset of slots rather than all slots. The system determines the minimum necessary DMRS mapping density to achieve acceptable demodulation performance, mapping DMRS to critical slots while omitting it from less critical slots to reduce overhead
3Productivity
If the PUSCH is transmitted in multiple slots with flexible DMRS mapping, then the resource utilization is improved, but the system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring DMRS mapping patterns and slot selection criteria before actual PUSCH transmission. The system establishes rules in advance for which slots will receive DMRS based on traffic patterns, channel characteristics, or QoS requirements, thereby simplifying real-time scheduling decisions while maintaining high resource utilization
Data Source
AI summary
A terminal apparatus includes a reception circuitry configured to receive a DCI format used for scheduling of a PUSCH, and a transmission circuitry configured to transmit the PUSCH in multiple slots. A size of a transport block is given based on a target coding rate indicated by the DCI format. The target coding rate is 1 or greater. An effective coding rate of the PUSCH is 1 or less. The effective coding rate is a value obtained by dividing the size of the transport block by a product of a modulation order of the PUSCH and the number of resource elements of the PUSCH.