Terminal Device PUCCH Resource Selection for Aperiodic CSI Transmission
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Solution Overview
Problem
In 5G systems, aperiodic CSI is often discarded during transmission on PUCCH resources, leading to impaired downlink data transmission and system performance due to limited bit capacity and missing DCI signals.
Innovation Solution
The method involves determining a target PUCCH resource from multiple indicated resources and sending UCI triggered by multiple pieces of DCI, with indication information to differentiate between types of UCI, ensuring aperiodic CSI is transmitted correctly by indicating whether CSI is present, using explicit or implicit carrying methods to maintain channel coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If aperiodic CSI is transmitted on PUCCH resource, then channel state information can be feedback, but the PUCCH resource bit capacity is exceeded and CSI is discarded
Solution Approach 1:
The patent segments the UCI into different types (first type with CSI, second type without CSI) and uses different mapping methods for each type. This segmentation allows the system to accommodate both CSI and A/N feedback while managing the limited PUCCH resource bit capacity efficiently.
Solution Approach 2:
The patent dynamically determines the UCI type based on whether the DCI triggers aperiodic CSI reporting, and dynamically selects the corresponding mapping method. This dynamic adaptation allows the system to optimize bit allocation based on actual feedback requirements rather than using a fixed approach.
2Reliability
If DCI indicates quantity of bits for A/N feedback, then A/N can be transmitted, but aperiodic CSI is discarded due to limited PUCCH resource
Solution Approach 1:
The patent merges the transmission of A/N and aperiodic CSI into a single PUCCH resource by defining a unified mapping method that accommodates both types of information. The DCI triggers both A/N feedback and aperiodic CSI reporting, and the system combines them in the UCI without discarding either component.
Solution Approach 2:
The patent creates a universal UCI structure that can carry both A/N feedback and aperiodic CSI depending on the DCI trigger. The mapping method is designed to be multi-functional, adapting to different feedback scenarios and ensuring that the PUCCH resource can accommodate various combinations of information types.
3Loss of information
If periodic CSI and A/N are transmitted at same moment, then both can be feedback, but PUCCH resource bit capacity is exceeded and periodic CSI is discarded
Solution Approach 1:
The patent segments feedback into periodic CSI (transmitted on PUCCH) and aperiodic CSI (triggered by DCI). The mapping method specifically handles aperiodic CSI differently from periodic CSI, allowing both to coexist in the PUCCH resource without exceeding bit capacity.
Solution Approach 2:
The patent uses DCI to preliminarily trigger aperiodic CSI reporting before the actual feedback transmission. This preliminary action allows the system to prepare and prioritize which CSI types to include in the UCI, ensuring efficient use of PUCCH resource bits.
Data Source
AI summary
This application provides an information transmission method and apparatus. The method includes: receiving, by a terminal device, a plurality of pieces of downlink control information DCI, where each of the plurality of pieces of DCI is used to trigger reporting of one piece of UCI and indicate a physical uplink control channel PUCCH resource carrying the UCI, the UCI includes at least one piece of channel state information CSI and response information, and PUCCH resources indicated by the plurality of pieces of downlink DCI occupy at least one same orthogonal frequency division multiplexing OFDM symbol; and sending, by the terminal device, target UCI on a target PUCCH resource, where the target UCI includes UCI triggered by the plurality of pieces of DCI, and the target PUCCH resource is one of the PUCCH resources indicated by the plurality of pieces of DCI.