HARQ Process Identifier Offset for Semi-Persistent Scheduling

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Solution Overview

Problem

In wireless communication technologies, particularly in 3GPP wireless access networks, the existing methods for determining HARQ process identifiers using semi-persistent scheduling (SPS) lead to conflicts when multiple SPS configurations are used, as they result in identical identifiers for different HARQ processes.

Innovation Solution

The method involves determining an identifier offset for each HARQ process based on its SPS configuration, using a formula that incorporates the SPS interval, the number of HARQ processes, and a sorting position of the SPS configuration. This ensures that each HARQ process receives a unique identifier, even when multiple SPS configurations are employed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple SPS configurations are used to increase resource allocation flexibility, then adaptability is improved, but identifier conflicts occur between different HARQ processes

Engineering Contradiction:

Improveresource allocation flexibilityVSAvoididentifier uniqueness

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the identifier space by introducing separate identifier determination formulas for different SPS configurations. Each configuration (first and second SPS configurations) has its own identifier calculation method, dividing the HARQ process identifier space into distinct segments that do not overlap, thereby preventing identifier conflicts while maintaining multiple configurations

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by making the identifier determination rule configuration-specific. Different SPS configurations have different identifier calculation characteristics (using different parameters such as SPS interval, HARQ process number, or sorting position), allowing each configuration to have optimized local identifier assignment that avoids conflicts with other configurations

Inventive Principle:

Principle #3Local quality

2Device complexity

If a single HARQ entity is used to simplify the system structure, then device complexity is reduced, but identifier management becomes problematic with multiple SPS configurations

Engineering Contradiction:

ImproveHARQ entity structureVSAvoididentifier management

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The patent changes the parameters used for identifier determination based on the SPS configuration. Instead of using a uniform identifier assignment, the system dynamically selects different parameters (SPS interval, HARQ process number, sorting position) depending on which SPS configuration is being used, enabling the single HARQ entity to manage multiple configurations without identifier conflicts

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4203585B1Method and apparatus for transmitting hybrid automatic repeat request using semi-persistent scheduling

Publication Date: 2025.01.22 ZTE CORP

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AI summary

Disclosed are a method and an apparatus for transmitting a hybrid automatic repeat request (HARQ) using a semi-persistent scheduling (SPS). The method for transmitting the hybrid automatic repeat request using the semi-persistent scheduling, which is applied to a network-side network element of an access network, includes: determining an identifier offset of an HARQ process using an SPS radio resource, and determining an identifier of the HARQ process according to the identifier offset of the HARQ process; and performing a transmission of the HARQ process corresponding to the identifier of the HARQ process with a user equipment.