Feedforward Weight Signaling for Wireless Feedback Errors

Solution Overview

Problem

In wireless communication systems, the existing dual-stream transmit antenna array (TxAA) technology faces challenges in accurately transmitting data due to potential feedback weight failures between the base station and user equipment, leading to system performance deterioration.

Innovation Solution

A method is introduced to provide precoding weights for data symbols by generating downlink frames with control subframes that include weight information, allowing for the transmission of accurate weights to the receiving device, even in cases of feedback failures, through the use of feedforward signaling messages over dedicated and shared channels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If feedback weight information is transmitted from user equipment to base station, then transmit antenna array performance is improved, but feedback weight errors cause system performance deterioration

Engineering Contradiction:

Improvefeedback weight accuracyVSAvoidfeedback mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent transmits feedforward weight information from base station to user equipment in advance, before the actual data transmission occurs. This preliminary transmission of weights allows the user equipment to prepare the correct receiving weights ahead of time, ensuring accurate signal reception even if feedback weight transmission encounters errors. The base station determines the weights based on channel conditions and sends them proactively to the user equipment.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a feedback mechanism where user equipment sends feedback information to the base station about channel conditions and reception status. The base station uses this feedback to adjust and determine optimal transmit weights, which are then sent back to the user equipment. This closed-loop feedback system enables continuous optimization of the transmit weights based on actual channel conditions.

Inventive Principle:

Principle #23Feedback

2Productivity

If dual-stream transmit antenna array technology is used, then data transfer rate is increased, but vulnerability to feedback failures increases

Engineering Contradiction:

Improvedata transfer rateVSAvoidsystem performance stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent transmits feedforward weight information from base station to user equipment in advance, before the actual data transmission occurs. This preliminary transmission of weights allows the user equipment to prepare the correct receiving weights ahead of time, ensuring accurate signal reception even if feedback weight transmission encounters errors. The base station determines the weights based on channel conditions and sends them proactively to the user equipment.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces feedforward weight information as an intermediary element that mediates between the base station's transmit weights and the user equipment's receiving weights. Instead of relying solely on feedback weights that may be corrupted, the feedforward weights serve as a reliable intermediary that carries the authoritative weight information from the base station to the user equipment, ensuring synchronization and accuracy.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If conventional transmit antenna array scheme is applied, then system performance is maintained, but adaptability to feedback failures is reduced

Engineering Contradiction:

Improvesystem performanceVSAvoidresistance to feedback weight errors

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent transmits feedforward weight information from base station to user equipment in advance, before the actual data transmission occurs. This preliminary transmission of weights allows the user equipment to prepare the correct receiving weights ahead of time, ensuring accurate signal reception even if feedback weight transmission encounters errors. The base station determines the weights based on channel conditions and sends them proactively to the user equipment.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the parameter transmission direction and timing by introducing feedforward weight information flow from base station to user equipment, complementing the traditional feedback flow. This parameter change in the weight information transmission mechanism provides redundancy and adaptability, allowing the system to maintain performance even when feedback parameters are corrupted or lost.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9967017B2Method for transmitting and receiving a signal to protect against erroneous feedback information

Publication Date: 2018.05.08 3G LICENSING SA

AI summary

A method for providing precoding weights for data symbols of data control subframes includes generating a downlink frame having control subframes which individually correspond to one of a plurality of downlink data subframes, and inserting weight information into each of the control subframes, such that the weight information is to be applied to data symbols present in the corresponding one of the data subframes. The method further includes transmitting the control subframes and the inserted weight information to a receiving device.