Aperiodic Channel State Information Transmission via PUSCH
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Solution Overview
Problem
Current methods for transmitting channel state information in MIMO systems face challenges in error detection capability, particularly in periodic transmissions over PUCCH, and require improved methods for aperiodic reporting and efficient use of channel capacity.
Innovation Solution
The method allows terminals to aperiodically transmit channel state information upon request from the base station using PUSCH, with error detection capabilities enhanced by incorporating CRC and additional error detection codes, and optimizes PUCCH capacity by transmitting CQI, PMI, and RI at different times or using different subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel state information is transmitted periodically over PUCCH, then the base station can continuously monitor channel conditions, but the error detection capability is insufficient
Solution Approach 1:
The patent combines periodic and aperiodic transmission modes into a unified system. The base station can configure both periodic PUCCH transmissions and trigger aperiodic PUSCH transmissions, merging the continuous monitoring capability of periodic transmission with the enhanced error detection of aperiodic transmission using CRC codes.
Solution Approach 2:
The patent introduces CRC (Cyclic Redundancy Check) codes as an intermediary error detection mechanism for aperiodic transmissions. The CRC code is attached to the channel state information before transmission over PUSCH, enabling the base station to detect transmission errors without requiring complex retransmission protocols.
2Reliability
If channel state information is transmitted aperiodically upon base station request, then error detection capability is improved, but transmission timing flexibility is reduced
Solution Approach 1:
The patent implements a dynamic transmission system where the base station can adaptively switch between periodic and aperiodic transmission modes based on channel conditions and traffic requirements. The base station configures periodic PUCCH resources for regular updates and dynamically triggers aperiodic PUSCH transmissions when immediate channel state information is needed, providing flexible adaptation to varying network conditions.
3Productivity
If multiple channel state information parameters are transmitted simultaneously, then reporting efficiency is improved, but PUCCH capacity is exceeded
Solution Approach 1:
The patent segments channel state information parameters into different transmission resources. Wideband CQI/PMI, subband CQI/PMI, and RI are transmitted at different times or on different PUCCH resources. This segmentation prevents any single PUCCH transmission from exceeding capacity while maintaining comprehensive channel state reporting through coordinated multiple transmissions.
Solution Approach 2:
The patent transitions from transmitting all channel state information parameters simultaneously on a single PUCCH resource to distributing them across multiple time slots and resources. By adding the time dimension to the transmission strategy, the system maintains reporting efficiency while respecting PUCCH capacity constraints through temporal separation of parameter transmissions.
Data Source
AI summary
A method for transmitting and receiving channel state information (CSI) periodically and aperiodically is disclosed. The method for aperiodically transmitting channel state information (CSI) by a terminal includes receiving an indicator requesting a channel state information report of a downlink channel from a base station over a downlink control channel, and aperiodically transmitting the channel state information (CSI) to the base station over a physical uplink shared channel (PUSCH) upon receiving the indicator from the base station.