UCI Multiplexing on Overlapping Configured Grant PUSCH
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Solution Overview
Problem
In 5G NR systems, when a Physical Uplink Shared Channel (PUSCH) is granted but no user data is available for transmission, simply skipping it can cause reliability and complexity issues, especially when it overlaps with a Physical Uplink Control Channel (PUCCH), leading to inefficiencies and increased decoding hypotheses at the base station.
Innovation Solution
A user equipment (UE) processor identifies overlapping PUSCHs and selects one to carry uplink control information (UCI) from the PUCCH, allowing the PUSCH to be transmitted instead of being skipped, thereby improving efficiency and reducing base station complexity by determining a set of configured grant PUSCHs and excluding those that collide with semi-static or dynamic symbols, and selecting based on index, logical channel priority, or transmission duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a granted PUSCH is skipped when no user data is available, then transmission resources are saved, but reliability and transmission efficiency deteriorate when PUCCH overlap occurs
Solution Approach 1:
The patent merges PUCCH and PUSCH transmissions by multiplexing UCI onto the PUSCH when they overlap in time. This combining approach allows the UE to transmit both control information (UCI) and data (or padding) on a single channel, resolving the contradiction by ensuring reliable UCI delivery while maintaining productive uplink transmission without skipping the granted PUSCH.
2Adaptability or versatility
If multiple PUSCHs overlap with a PUCCH, then more options exist for UCI multiplexing, but base station decoding complexity increases
Solution Approach 1:
The patent applies local quality by selecting specific PUSCH candidates based on their overlap characteristics with the PUCCH. Rather than considering all PUSCHs equally, the method evaluates each PUSCH's time-domain overlap with the PUCCH and selects the one with the most appropriate overlap pattern for UCI multiplexing, thereby reducing base station decoding complexity while maintaining adaptability.
3Productivity
If PUSCH is transmitted without user data to carry UCI, then transmission efficiency improves, but resource waste occurs without proper data mapping
Solution Approach 1:
The patent applies partial action by transmitting only the necessary components on the PUSCH when no user data is available. The UE transmits the PUSCH with UCI multiplexed and appropriate padding, but without attempting to map nonexistent user data. This partial transmission approach maintains uplink transmission efficiency and ensures reliable UCI delivery while avoiding the waste of energy that would occur from skipping the transmission entirely or from complex attempts to find data to transmit.
Data Source
AI summary
Some aspects of this disclosure relate to apparatuses and methods for implementing techniques for a user equipment (UE) to transmit a configured grant (CG) physical uplink shared channel (PUSCH) including an uplink control information (UCI) without transmitting a physical uplink control channel (PUCCH). The UE determines, based on a configuration received from the base station, a first set of CG PUSCHs. Each CG PUSCH of the first set of CG PUSCHs overlaps with the PUCCH, and is configured to transmit data from the UE to the base station. The UE further determines a second set of CG PUSCHs by excluding a third set of CG PUSCHs from the first set of CG PUSCHs. and select a CG PUSCH from the second set of CG PUSCHs to carry the UCI contained in the PUCCH. The UE further transmits the selected CG PUSCH including the UCI without transmitting the PUCCH.