Multi-Slot PUSCH Repetitions for 5G Uplink Coverage
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Solution Overview
Problem
Existing 5G NR technologies face challenges in enhancing uplink data channel coverage, particularly in coverage-limited scenarios, where transmission power is a bottleneck, and increasing bandwidth with lower effective code rates leads to resource inefficiencies and potential loss of uplink control information reliability.
Innovation Solution
Implementing TBS scaling and MCS scaling for multiple-slot PUSCH transmissions, along with multiplexing uplink control information (UCI) on PUSCH repetitions, to enhance transmission reliability and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bandwidth is increased with lower effective code rates to enhance coverage, then coverage is improved, but resource efficiency deteriorates and uplink control information reliability is lost
Solution Approach 1:
The PUSCH transmission is divided into multiple repetitions across different slots, where each repetition carries a portion of the transport block. This segmentation allows the system to achieve coverage enhancement through repeated transmissions without requiring continuous bandwidth expansion, thereby maintaining resource efficiency while improving reliability in coverage-limited scenarios.
Solution Approach 2:
The patent implements periodic repetition of PUSCH transmissions across multiple slots with a defined repetition pattern. This periodic action enables the system to achieve coverage enhancement through time-domain repetition rather than frequency-domain bandwidth expansion, resolving the contradiction between coverage improvement and resource efficiency maintenance.
2Quantity of substance
If TBS is scaled up for multiple-slot PUSCH transmissions, then data transmission capacity is improved, but transmission power requirements increase
Solution Approach 1:
The patent introduces dynamic TBS scaling mechanisms where the transport block size is adjusted based on the number of repetitions and slot configurations. This dynamic adjustment allows the system to optimize data transmission capacity while adapting power requirements to the actual transmission conditions, resolving the contradiction between capacity improvement and power consumption control.
Solution Approach 2:
The system changes key parameters including TBS scaling factors, modulation and coding schemes (MCS), and repetition numbers to achieve optimal balance between data transmission capacity and power consumption. These parameter adjustments enable the system to scale TBS for multiple-slot transmissions while controlling power requirements through coordinated parameter optimization.
3Reliability
If PUSCH repetitions are transmitted over multiple slots, then transmission reliability is improved, but peak-to-average power ratio increases
Solution Approach 1:
The patent implements preliminary power control adjustments before PUSCH repetition transmissions by configuring power offset parameters and scaling factors in advance. This preliminary action allows the system to maintain consistent power levels across multiple slots, preventing peak power spikes while ensuring transmission reliability through repeated transmissions at controlled power levels.
Solution Approach 2:
The system ensures continuous power delivery across multiple PUSCH repetition slots by maintaining steady power levels rather than allowing peak variations. This continuity of useful action in power transmission achieves reliability through repeated transmissions while avoiding peak-to-average power ratio increases, as each repetition transmits at consistent power levels.
4Reliability
If UCI is multiplexed with PUSCH repetitions, then control information transmission is enhanced, but resource allocation complexity increases
Solution Approach 1:
The patent merges UCI transmission with PUSCH repetitions by multiplexing control information onto the same physical resources as data transmissions. This merging eliminates the need for separate UCI resource allocations, thereby enhancing control information transmission reliability while actually reducing resource allocation complexity through resource consolidation rather than multiplication.
Solution Approach 2:
The PUSCH resources are designed to serve multiple functions simultaneously: carrying both data transmissions and control information (UCI) across multiple repetitions. This multi-functionality allows the same resource allocation to support both data and control planes, enhancing control information transmission while simplifying resource management through universal resource usage rather than separate allocations.
Data Source
AI summary
Apparatus, methods, and computer-readable media for improving uplink data channel repetitions using multiple slot transmit time intervals are disclosed herein. An example method for wireless communication at a user equipment (UE) includes receiving scheduling downlink control information (DCI) indicating, in a time domain resource allocation (TDRA) field, a scaling parameter for a transport block size (TBS) of a physical uplink shared channel (PUSCH) transmission for transmission as PUSCH repetitions over a repetition unit comprising a plurality of single repetitions. The example method also includes transmitting the PUSCH repetitions with scaling based on the scaling parameter indicated in the scheduling DCI.