Wireless Feedback CRC Coding for Reliable PMI Signaling

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Solution Overview

Problem

Wireless communication systems lack effective error checking and detection capabilities for feedback signaling, leading to degraded link and system performance, particularly in advanced applications like MIMO systems, due to the significant number of bits required for precoding matrix index (PMI) feedback.

Innovation Solution

Implementing error check (EC) bits, such as cyclic redundancy check (CRC), for feedback signals like PMI, CQI, and ACK/NACK, ensuring they are encoded and transmitted via data or control channels, allowing for robust error detection and correction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If error checking and detection capability is added to feedback control signaling, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improvefeedback signaling reliabilityVSAvoidsignaling structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by attaching error check bits to feedback signaling elements (such as PMI, CQI, ACK/NACK) before transmission. This allows error detection capability to be built into the signaling structure in advance, enabling the receiver to detect errors without requiring complex post-reception processing or additional feedback rounds.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses error check bits as an intermediary element that mediates between the transmitter and receiver. These bits are attached to feedback signaling elements and serve as a separate detection mechanism that doesn't interfere with the primary feedback function, allowing error detection while maintaining the original signaling purpose.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If error check bits are attached to feedback signals, then reliability is improved, but loss of information increases due to additional overhead bits

Engineering Contradiction:

Improvefeedback signal accuracyVSAvoidspectral efficiency

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent applies partial action by attaching error check bits selectively to specific feedback signaling elements rather than to all signals uniformly. The error check capability is applied where most needed (to critical feedback elements like PMI and CQI) while maintaining spectral efficiency by not over-protectioning all signaling elements equally.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12524301B2Error detection and checking in wireless communication systems

Publication Date: 2026.01.13 INTERDIGITAL PATENT HOLDINGS INC

AI summary

A device capable of operating in a wireless communication environment. The device may be configured to determine a plurality of control signaling bits. The device may determine a plurality of cyclic redundancy check (CRC) bits based on the plurality of control signaling bits. The device may apply a channel coding scheme to the plurality of control signaling bits and the plurality of CRC bits. The plurality of CRC bits may be distributed among the plurality of control signaling bits prior to applying the channel coding scheme. The device may transmit the channel coded plurality of control signaling bits and CRC bits.