CQI-Only PUSCH Transmission via DCI Scheduling
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting larger channel quality indicator (CQI) and precoding matrix indicator feedback payloads on the physical uplink shared channel (PUSCH), particularly in supporting advanced downlink MIMO operations and carrier aggregation, due to limitations in modulation order, bandwidth allocation, and simultaneous reporting across multiple component carriers.
Innovation Solution
The proposed solution involves using downlink control information (DCI) formats 0 and 4 to schedule CQI-only feedback payloads on the PUSCH, allowing for higher modulation orders, increased bandwidth allocation, and support for rank-1 beamforming and multiple-input multiple-output (MIMO) spatial multiplexing, enabling efficient transmission of larger payloads and simultaneous reporting across primary and secondary component carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional CQI transmission methods are used on PUSCH, then basic feedback is supported, but larger CQI/PMI feedback payloads cannot be efficiently transmitted
Solution Approach 1:
The patent changes the modulation order parameter from traditional QPSK (2 bits per symbol) to higher order modulations like 16-QAM (4 bits per symbol) and 64-QAM (6 bits per symbol) for CQI feedback transmission. This parameter change enables larger CQI/PMI feedback payloads to be transmitted efficiently within the same time-frequency resources, directly resolving the contradiction between payload size and transmission efficiency
2Quantity of substance
If higher modulation orders are used for CQI transmission, then payload capacity increases, but performance in low SNR scenarios deteriorates
Solution Approach 1:
The patent introduces dynamic modulation and coding scheme (MCS) selection that adapts to channel conditions. The base station configures different MCS indices for CQI feedback, allowing the system to dynamically switch between robust low-order modulations in poor conditions and high-order modulations in good conditions. This dynamic adaptation resolves the contradiction by optimizing the trade-off between payload capacity and reliability based on actual SNR conditions
3Quantity of substance
If bandwidth allocation is increased for CQI transmission, then more feedback data can be sent, but resource utilization efficiency decreases
Solution Approach 1:
The patent changes the spectral efficiency parameter by implementing higher order modulations (16-QAM, 64-QAM) for CQI feedback. This allows more bits per symbol to be transmitted in the same bandwidth, effectively increasing feedback data volume without requiring additional bandwidth resources. The parameter change in modulation order directly resolves the contradiction between feedback data volume and resource utilization efficiency
4Use of energy by moving object
If CQI feedback is multiplexed with data transmission, then resource efficiency improves, but feedback reliability and priority are compromised
Solution Approach 1:
The patent extracts CQI feedback from data multiplexing and creates a separate CQI-only transmission mode on PUSCH. By separating CQI feedback into its own dedicated transmission resource (using specific DCI format 0 configurations with CQI request bits), the system ensures feedback reliability and priority while maintaining efficient resource utilization through specialized modulation and coding schemes optimized for feedback traffic
Data Source
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AI summary
A method for transmitting a channel quality indicator-only feedback payload is described. A channel quality indicator scheduling message is received from a base station. A channel quality indicator-only feedback payload is generated. The channel quality indicator-only feedback payload is transmitted on a physical uplink shared channel. The method may be performed by a wireless communication device.