HARQ-ACK Feedback for Simultaneous Multi-Beam PDSCH Reception
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Solution Overview
Problem
In the 5G NR system, there is no defined scheme for accurately performing ACK and/or NACK feedback on multiple PDSCHs received simultaneously in the same serving cell, making it impossible to accurately feed back ACKs and/or NACKs.
Innovation Solution
A feedback information transmission method that involves receiving configuration information from a base station, determining the quantity of beam groups, and generating an HARQ-ACK sequence based on the quantity of bits, which is then transmitted to the base station, ensuring accurate ACK and/or NACK feedback for downlink transmissions using different beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE receives multiple PDSCHs simultaneously in the same serving cell using different beams, then the downlink transmission capacity is improved, but there is no defined feedback scheme making it impossible to accurately feed back ACKs and/or NACKs
Solution Approach 1:
The patent segments the feedback information for multiple PDSCHs received simultaneously by introducing a feedback indicator field in the downlink control information. Each PDSCH reception is assigned a specific feedback indicator value, allowing the UE to provide differentiated ACK/NACK feedback for each beam-based transmission. This segmentation enables accurate feedback for multiple simultaneous receptions without requiring a completely new feedback mechanism.
Solution Approach 2:
The patent adds a new dimension to the feedback mechanism by incorporating beam-specific feedback indicators. Instead of using only the traditional timing and sequence-based feedback approach, the system introduces beam identification as an additional dimension. This allows the feedback to distinguish between multiple PDSCHs received on different beams within the same time-frequency resource, resolving the ambiguity in simultaneous feedback scenarios.
2Adaptability or versatility
If the UE receives two PDSCHs at the same time from different TRPs using different beams, then the system diversity is improved, but the feedback information transmission becomes undefined
Solution Approach 1:
The patent creates a universal feedback mechanism that handles both single and multiple simultaneous PDSCH receptions through the same downlink control information structure. The feedback indicator field serves multiple functions: it identifies the beam used for transmission, distinguishes between different TRPs, and provides the ACK/NACK status. This multi-functionality allows the system to maintain diversity benefits while using a unified feedback approach rather than requiring separate mechanisms for different scenarios.
Solution Approach 2:
The patent introduces the feedback indicator as an intermediary element that mediates between the multiple PDSCH receptions from different TRPs and the single uplink feedback channel. This intermediary field in the downlink control information carries beam-specific identification that enables the UE to map multiple simultaneous receptions to distinct feedback bits, simplifying the overall feedback transmission process while maintaining support for diverse transmission scenarios.
3Productivity
If the UE provides ACK/NACK feedback for multiple PDSCHs through the same uplink channel, then the uplink resource efficiency is improved, but the feedback information may conflict or overlap
Solution Approach 1:
The patent applies local quality by making the feedback information beam-specific through the feedback indicator field. Each feedback bit or field is associated with a specific beam identification, ensuring that ACK/NACK information for different beams remains distinct even when transmitted through the same uplink channel. This local differentiation prevents information loss and confusion that would otherwise occur from overlapping feedback for multiple PDSCHs.
Solution Approach 2:
The patent changes the parameter structure of the feedback information by incorporating beam identification parameters within the downlink control information. By modifying the control information to include feedback indicators that uniquely identify each beam-based PDSCH reception, the system enables the UE to generate differentiated feedback parameters for multiple simultaneous receptions. This parameter change ensures that feedback information remains clear and distinguishable while utilizing efficient uplink resources.
Data Source
AI summary
A feedback information transmission method, a feedback information transmission device, a UE, a base station and a computer-readable storage medium are provided. The feedback information transmission method includes: receiving configuration information from a base station, and determining the quantity of beam groups based on the configuration information; determining the quantity of bits of an HARQ-ACK based on the quantity of the beam groups; and generating an HARQ-ACK sequence corresponding to the quantity of the bits and transmitting the HARQ-ACK sequence to the base station.