PUCCH Resource Mapping in Carrier Aggregation Systems

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Solution Overview

Problem

In wireless communication systems, particularly in LTE systems using inter-band carrier aggregation with different TDD UL/DL configurations, physical uplink control channel resource collisions occur, leading to inefficiencies and potential interference, especially in scenarios with different UL/DL configurations across component carriers.

Innovation Solution

The solution involves determining a derived downlink association set based on hybrid automatic repeat request timing linkages between component carriers with different UL/DL configurations, allowing for effective mapping of physical uplink control channel resources to avoid collisions by identifying PUCCH resources based on specific association sets and timing configurations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If inter-band carrier aggregation with different TDD UL/DL configurations is used, then bandwidth expansion and communication flexibility are improved, but physical uplink control channel resource collisions occur leading to interference and inefficiency

Engineering Contradiction:

Improvecarrier aggregation flexibilityVSAvoidPUCCH resource collision interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the PUCCH resource allocation by introducing separate downlink association sets for each component carrier. Each component carrier's PUCCH resources are independently identified based on its specific downlink association set, preventing resource collisions between carriers with different TDD configurations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by configuring different downlink association sets for different component carriers based on their specific TDD UL/DL configurations. Each carrier's PUCCH resources are optimized locally according to its timing requirements, rather than using a uniform allocation scheme across all carriers.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If different TDD UL/DL configurations are applied across component carriers, then system adaptability is improved, but determining PUCCH resources becomes more complex

Engineering Contradiction:

ImproveTDD configuration flexibilityVSAvoidPUCCH resource mapping complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent enables self-service by allowing each component carrier to independently determine its PUCCH resources based on its own downlink association set. The system automatically handles the complexity of different TDD configurations through standardized procedures that adapt to each carrier's specific timing requirements without manual intervention.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent manages complexity through parameter changes by dynamically adjusting the downlink association set parameters for each component carrier according to its TDD configuration. This allows the system to adapt to different configurations while maintaining a consistent resource identification mechanism.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If PUCCH resources are allocated without considering different TDD configurations, then resource allocation simplicity is maintained, but resource collisions and interference increase

Engineering Contradiction:

Improveresource allocation simplicityVSAvoidPUCCH resource collision free operation

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-configuring downlink association sets for each component carrier based on their TDD UL/DL configurations. This preliminary setup ensures that PUCCH resources are correctly identified before actual uplink transmissions occur, preventing collisions while maintaining allocation simplicity through standardized procedures.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9007963B2Uplink control channel resource mapping in carrier aggregation systems

Publication Date: 2015.04.14 MALIKIE INNOVATIONS LTD

AI summary

Certain aspects of the present disclosure describe determining a downlink (DL) hybrid automatic repeat request (HARD) timing linkage between a first component carrier and a second component carrier, the first component carrier having a different uplink (UL) and DL configuration than the second component carrier. A derived downlink association set can be determined. A PUCCH resource in a subframe can be identified based on a first downlink association set associated with the first component carrier and the derived downlink association set.