Terminal Response Signal Mapping for LTE-A Carrier Aggregation

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Solution Overview

Problem

In LTE-A systems with carrier aggregation, the quality of uplink data is degraded due to puncturing by response signals, especially when multiple response signals are transmitted simultaneously, leading to significant coding gain loss and power inefficiency.

Innovation Solution

A terminal apparatus and method that map response signals to specific resources based on the number of downlink component carriers, allowing flexible allocation of response signals to minimize puncturing of uplink data and maintain power efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple response signals are transmitted simultaneously in LTE-A carrier aggregation, then downlink communication efficiency is improved, but uplink data quality is degraded due to puncturing

Engineering Contradiction:

Improvedownlink communication efficiencyVSAvoiduplink data quality

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the uplink resource into multiple regions, with a first region reserved for response signals and a second region for uplink data. This segmentation prevents response signals from puncturing uplink data by allocating them to separate, non-overlapping resource regions, thereby resolving the contradiction between transmitting multiple response signals efficiently and maintaining uplink data quality.

Inventive Principle:

Principle #1Segmentation

2Use of energy by moving object

If response signals are mapped to flexible resources, then power efficiency is improved, but resource allocation complexity increases

Engineering Contradiction:

Improvepower efficiencyVSAvoidresource allocation complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent applies local quality by assigning different mapping strategies to different resource regions. The first region is specifically optimized for response signal transmission with predetermined resource allocation, while the second region handles uplink data. This localized optimization maintains power efficiency through flexible resource mapping while reducing overall complexity through structured regional division.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS8942199B2Terminal apparatus and response signal mappiing method

Publication Date: 2015.01.27 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

This invention relates to a terminal apparatus that can possibly reduce situations in which upstream channel data are punctured by a plurality of response signals. When having received at least one piece of downstream allocation control information corresponding to a second downstream unit band, which is other than a first downstream unit band, of a plurality of unit bands, a control unit (208) maps a plurality of response signals, which are corresponding to the respective ones of the plurality of downstream unit bands established, to a first resource corresponding to the plurality of downstream unit bands established. When having received only the downstream allocation control information corresponding to the first downstream unit band of the plurality of unit bands established, the control unit (208) maps the response signal, which is corresponding to the first downstream unit band, to a second resource corresponding to the first downstream unit band.