HARQ Resource Mapping for TDD UL/DL Configuration Adaptability

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In LTE/TDD systems, legacy and advanced UEs configured with different UL/DL configurations can experience HARQ resource collisions, leading to undetectable HARQ feedbacks and disrupted communications between the network and UEs.

Innovation Solution

The advanced UE determines and configures a new association set for HARQ resources based on the legacy UE's UL/DL configuration, establishing a mapping between sequence indices to avoid resource collisions, allowing regular communication operations without affecting the legacy UE's operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If legacy UE and advanced UE are configured with different UL/DL configurations, then system adaptability is improved, but HARQ resource collision occurs leading to communication reliability degradation

Engineering Contradiction:

ImproveUL/DL configuration adaptabilityVSAvoidHARQ feedback detection reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the HARQ resource space by creating separate association sets for legacy UEs and advanced UEs. Legacy UEs use the original association set while advanced UEs use a newly configured association set, thereby dividing the resource space to avoid collisions between different UE types with different UL/DL configurations

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the parameters of the association set by reconfiguring the HARQ-ACK resource indication values (RVIs) for advanced UEs. By modifying the association set parameters while keeping legacy UE parameters unchanged, the system allows advanced UEs to use different UL/DL configurations without causing resource collisions

Inventive Principle:

Principle #35Parameter changes

2Speed

If advanced UE uses fast UL/DL configuration changes, then system responsiveness is improved, but HARQ resource collision with legacy UE occurs

Engineering Contradiction:

ImproveUL/DL configuration switching speedVSAvoidHARQ resource collision

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a new association set as an intermediary mechanism that mediates between advanced UEs using fast UL/DL configuration changes and legacy UEs using static configurations. This intermediary association set allows advanced UEs to switch configurations rapidly while mapping their HARQ resources to a separate space that does not conflict with legacy UE resources

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If same HARQ resource is used by legacy UE and advanced UE, then resource utilization is improved, but HARQ feedback detection fails

Engineering Contradiction:

ImproveHARQ resource utilization efficiencyVSAvoidHARQ feedback detection accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent adds a new dimension to the HARQ resource space by introducing a separate association set for advanced UEs. Instead of competing for the same HARQ resources in the original dimension, advanced UEs operate in an extended dimension with their own association set, allowing both legacy and advanced UEs to maintain high resource utilization without detection conflicts

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentEP2672644B1Method of handling HARQ resource in a TDD system and related communication device

Publication Date: 2023.08.09 ACER INC

Figure 1
Figure 2
Figure 3

AI summary

A method of determining hybrid automatic repeat request (HARQ) resource of a UL subframe for an advanced communication device comprises determining a first new association set of the UL subframe according to an association set of the UL subframe of a first UL/DL configuration of a legacy communication device; configuring a mapping between at least one sequence index of the UL subframe of the first UL/DL configuration and the first new association set according to the first UL/DL configuration; and determining the HARQ resource of the UL subframe according to the mapping and the first new association set.