MIMO Feedback Signaling Error Checking for PMI Reliability

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

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 data detection and system capacity.

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 protecting feedback signaling and improving system performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If error check bits are added to feedback signaling, 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 are attached to feedback signaling in advance before transmission, enabling error detection and correction capabilities to be pre-established. This preliminary action ensures that reliability improvements are achieved without requiring complex real-time processing during transmission.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Error check bits serve as an intermediary element that mediates between the feedback information and the transmission channel. These bits provide error detection and correction capabilities without directly modifying the core feedback data, thus improving reliability while maintaining relatively simple signaling structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If error detection and correction capabilities are added to feedback signaling, then link performance is improved, but overhead increases

Engineering Contradiction:

Improvelink performanceVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

Instead of implementing full error correction coding which would significantly increase overhead, the patent applies partial error detection and correction by attaching error check bits. This partial action provides sufficient error protection for feedback signaling while keeping the overhead increase manageable and acceptable for the system.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If feedback signaling is protected by coding, then reliability is improved, but error checking or detection capabilities are lacking

Engineering Contradiction:

Improvefeedback signaling protectionVSAvoiderror detection capability

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent merges error detection and correction capabilities with feedback signaling by integrating error check bits attachment and channel coding processes. This combination ensures that feedback signaling is both protected against errors and equipped with error detection capabilities, resolving the contradiction between protection and error detection.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10970162B2Feedback signaling error detection and checking in MIMO wireless communication systems

Publication Date: 2021.04.06 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.