Multi-TB PUSCH Repetition in Unlicensed Configured Grants
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Solution Overview
Problem
Existing PUSCH repetition configurations are less suitable for communications in unlicensed frequency bands, particularly for multi-TB repetitions within a slot, leading to increased latency and inefficiencies in resource utilization.
Innovation Solution
Implement mechanisms for multi-TB repetition uplink communications using configured grant resources in unlicensed bands, including determining TB parameters, applying hybrid automatic repeat request (HARQ) processes, and indicating HARQ process identifiers to enhance communication reliability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transport block repetition is used to transmit uplink payload multiple times, then communication reliability is improved, but transmission latency increases
Solution Approach 1:
The patent segments the uplink transmission into multiple transport blocks (TBs) that can be transmitted in parallel across different time resources. By dividing the data into multiple TBs with different repetition factors, the system achieves both reliability through repetition and reduced latency through parallel transmission paths.
Solution Approach 2:
The patent introduces dynamic configuration of repetition factors for each transport block, allowing the system to adaptively adjust the number of repetitions based on channel conditions, data priority, and latency requirements. This dynamic approach enables optimization of the reliability-latency tradeoff in real-time.
2Productivity
If multiple transport blocks are transmitted with different repetition factors, then data throughput is improved, but device complexity increases
Solution Approach 1:
The patent applies partial repetition by allowing different transport blocks to have different repetition factors, where high-priority or time-sensitive data receives fewer repetitions while less critical data receives more repetitions. This partial application of repetition optimizes throughput without unnecessarily increasing complexity for all data.
Solution Approach 2:
The patent changes the repetition factor parameter dynamically for different transport blocks based on data characteristics, channel conditions, and QoS requirements. This parameter variation enables flexible control of throughput and complexity tradeoffs without requiring complete system redesign.
3Reliability
If hybrid automatic repeat request techniques are applied to TB repetition, then communication reliability is improved, but resource utilization efficiency decreases
Solution Approach 1:
The patent performs preliminary transmission of multiple transport blocks with different repetition factors before requiring any retransmissions. By pre-configuring diverse repetition paths, the system reduces the need for subsequent HARQ retransmissions, thereby improving resource utilization while maintaining high reliability.
Solution Approach 2:
The patent implements feedback mechanisms where the base station provides acknowledgment information for each transport block, enabling the UE to selectively retransmit only those TBs that failed decoding. This feedback-driven approach optimizes resource usage by avoiding unnecessary retransmissions of successfully received data.
Data Source
AI summary
Mechanisms for transmitting a plurality of uplink (UL) transmission block (TB) repetitions associated with a plurality of TBs in a configured grant (CG) resource are provided. In one aspect, a method for multi-TB PUSCH repetition performed by a CE includes determining, based on a first parameter and a second parameter, a number of transport blocks (TBS) for a multi-TB repetition uplink (UL) communication in a configured grant (CG) resource, where the first parameter indicates a first number of TB repetitions, and where the second parameter indicates a second number of TB repetitions. The method further includes transmitting, to a base station (BS) using the CG resource in an unlicensed band, a plurality of TB repetitions based on the determined number of TBs.