MIMO Feedback Error Checking for Reliable PMI and CQI Signaling

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Solution Overview

Problem

Current wireless communication systems lack effective error checking and detection capabilities in feedback signaling, leading to significant degradation of link and system performance, particularly in MIMO systems, where feedback errors can severely impact precoding and channel quality index validation.

Innovation Solution

Implementing error check bits, such as Cyclic Redundancy Check (CRC) bits, attached to feedback signals like PMI, CQI, and ACK/NACK, and coding them with data bits using various channel coding schemes to enhance error detection and correction capabilities, thereby improving the reliability of feedback signaling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If error check bits are attached to feedback signals, then reliability of feedback signaling is improved, but device complexity increases

Engineering Contradiction:

Improvefeedback signaling reliabilityVSAvoidsignaling structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Error check bits (such as CRC bits) are attached to feedback signals before transmission to the base station. This preliminary error detection capability is built into the feedback signaling structure in advance, allowing the receiver to detect errors without requiring complex post-reception processing or additional feedback rounds.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Error check bits serve as an intermediary mechanism between the transmitter and receiver in the feedback signaling process. These bits mediate the error detection function, enabling reliable communication without requiring the feedback signaling structure itself to become more complex.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If error detection capability is added to feedback signaling, then link performance is enhanced, but overhead increases

Engineering Contradiction:

Improvelink performanceVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

Rather than implementing comprehensive error correction codes that would significantly increase overhead, the patent applies partial error detection using compact check bits (e.g., CRC bits). This provides sufficient error detection capability for feedback signaling without the excessive overhead of full error correction schemes.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The error check bits are lightweight, minimal overhead elements that provide effective error detection. These compact check bits act as disposable protection mechanisms that can be easily appended to feedback signals without consuming significant signaling resources.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS11687401B2Feedback signaling error detection and checking in MIMO wireless communication systems

Publication Date: 2023.06.27 INTERDIGITAL PATENT HOLDINGS INC

AI summary

A method of feedback in a wireless transmit receive unit includes providing a precoding matrix index (PMI), error checking the (PMI) to produce an error check (EC) bit, coding the PMI and the EC bit and transmitting the coded PMI and EC bit.