Aperiodic Trigger Signaling for Carrier Aggregation Feedback

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Solution Overview

Problem

In carrier aggregation scenarios, existing technologies lack a defined method for non-periodic trigger signaling, making it impossible for User Equipment (UE) to determine which downlink component carrier to feedback, leading to inefficient resource allocation and performance issues in downlink data transmission.

Innovation Solution

A method and system where the base station sends a non-periodic trigger signaling to the UE, allowing it to determine and trigger feedback on specific downlink component carriers, reducing unnecessary uplink feedback and enabling the base station to adjust resource allocation effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If carrier aggregation is adopted to support wider frequency spectrum, then the downlink transmission bandwidth and peak rate are improved, but the complexity of non-periodic trigger signaling increases and the UE cannot determine which component carrier to feedback

Engineering Contradiction:

Improvedownlink transmission bandwidthVSAvoidnon-periodic trigger signaling complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent segments the carrier aggregation scenario by introducing separate handling mechanisms for different component carriers. The base station sends non-periodic trigger signaling on a first component carrier to trigger feedback on a second component carrier, creating a segmented feedback architecture that resolves the ambiguity in carrier identification.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary mechanism where the first component carrier acts as a mediator to carry the non-periodic trigger signaling for the second component carrier. This intermediary approach allows the UE to correctly identify which component carrier's feedback is being requested without increasing overall system complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If non-periodic feedback is implemented without defined trigger signaling method, then the feedback flexibility is improved, but the UE is unable to determine which downlink component carrier to feedback

Engineering Contradiction:

Improvefeedback flexibilityVSAvoidcomponent carrier identification information

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent applies preliminary action by having the base station pre-configure the mapping relationship between component carriers and trigger signaling. The UE uses this pre-established configuration to correctly interpret the non-periodic trigger signaling and identify the target component carrier for feedback, preventing information loss.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a feedback mechanism where the UE feeds back channel quality information for the specified component carrier upon receiving the non-periodic trigger signaling. This feedback loop ensures that the UE correctly identifies and reports the appropriate component carrier while maintaining feedback flexibility.

Inventive Principle:

Principle #23Feedback

3Ease of manufacture

If all downlink component carriers send scheduling information on themselves, then the scheduling simplicity is improved, but the uplink feedback resource allocation becomes inefficient

Engineering Contradiction:

Improvescheduling simplicityVSAvoiduplink feedback resource waste

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The patent applies partial action by enabling the base station to send non-periodic trigger signaling on a first component carrier to trigger feedback on a second component carrier. This selective approach allows feedback only when needed, avoiding unnecessary uplink feedback resources and reducing energy consumption while maintaining scheduling simplicity.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP2555577B1Method and system for aperiodic feedback under carrier aggregation scene

Publication Date: 2016.03.30 ZTE CORP

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AI summary

The present invention discloses a method and a system for non-periodic feedback in a carrier aggregation scenario. The method comprises: a base station sending a non-periodic trigger signaling to a piece of User Equipment (UE); the UE receiving the non-periodic trigger signaling, and determining a Downlink Component Carrier (DL CC) requiring feedback according to the non-periodic trigger signaling; the UE triggering a non-periodic feedback of the determined DL CC. With the present invention, the problem that it is impossible to determine which downlink component carrier is to be fed back according to the non-periodic trigger signaling in the carrier aggregation scenario is solved, uplink feedback of the DL CC that is unnecessary to be fed back is effectively reduced, the base station can adjust resource allocation according to information fed back by the UE, and the performance of downlink data transmission is ensured.