PUSCH Repetition Enhancement for TDD Collision Avoidance
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Solution Overview
Problem
The existing PUSCH repetition type A in 5G NR systems for TDD scenarios faces inefficiencies due to dropped repetitions caused by collisions with downlink symbols and SRS resources, leading to degraded coverage performance and transmission efficiency.
Innovation Solution
A mechanism is developed to determine available UL slots and transmission occasions for PUSCH repetitions based on the time domain resource assignment field in DCI, allowing for enhanced PUSCH repetition by selecting appropriate symbol sets that avoid collisions with PUCCH and SRS resources, and adjusting the start symbol to ensure sufficient resources for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUSCH repetition type A is used in TDD scenarios, then transmission can be performed in uplink slots, but repetitions are dropped when colliding with downlink symbols or SRS resources, degrading coverage performance
Solution Approach 1:
The patent applies dynamics by making the PUSCH repetition mechanism adaptive to TDD slot configurations. The system dynamically determines whether to perform PUSCH repetitions in available uplink slots based on the TDD configuration, allowing the transmission behavior to change according to the dynamic slot structure rather than following a fixed repetition pattern.
Solution Approach 2:
The patent changes the parameter of repetition counting from consecutive slots to available uplink slots only. By redefining the denominator in the repetition ratio calculation to count only available uplink slots rather than all consecutive slots, the system adjusts the transmission parameters to match the TDD scenario characteristics, preventing unnecessary repetitions in unavailable slots.
2Productivity
If PUSCH repetitions are performed in all consecutive slots, then transmission efficiency is maintained, but collisions with downlink symbols cause repetitions to be dropped, reducing actual transmitted repetitions
Solution Approach 1:
The patent applies preliminary action by determining the TDD slot configuration and identifying available uplink slots before performing PUSCH repetitions. The system proactively checks the TDD configuration to identify which slots are actually available for uplink transmission, and only schedules repetitions in those identified available slots, preventing collisions before they occur.
3Device complexity
If the start symbol is not adjusted, then resource allocation is simple, but insufficient resources remain for transmission when collisions occur
Solution Approach 1:
The patent changes the start symbol parameter dynamically based on the TDD slot configuration. When a collision with downlink symbols is detected, the system adjusts the start symbol to begin after the downlink symbols end, ensuring sufficient resources are available for the complete PUSCH transmission. This parameter adjustment is triggered by the collision detection mechanism.
Data Source
AI summary
Embodiments of the present application are related to methods and apparatuses a physical uplink shared channel (PUSCH) repetition enhancement mechanism for a time division duplex (TDD) scenario. A method according to an embodiment of the present application includes: receiving downlink control information (DCI) including a time domain resource assignment field; determining a time domain resource in each of one or more available uplink slots based on the time domain resource assignment field in the DCI, to obtain the determined one or more time domain resources; and transmitting uplink (UL) data on the determined one or more time domain resources.