Dynamic HARQ Process Quantity Adjustment for Wireless Communication

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Solution Overview

Problem

Current wireless communication systems face challenges in dynamically managing hybrid automatic repeat request (HARQ) processes based on operating bands and subcarrier spacing, leading to inefficiencies in HARQ feedback and rate matching, particularly in scenarios with varying bandwidth and symbol durations.

Innovation Solution

The system dynamically adjusts the quantity of active HARQ processes and limited buffer rate matching (LBRM) based on operating bands and subcarrier spacing, allowing for flexible configuration of HARQ processes and buffer sizes, enabling efficient HARQ feedback and rate matching through dynamic indications and feedback mechanisms between user equipment (UE) and network entities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the quantity of active HARQ processes is fixed, then the system complexity is reduced, but the adaptability to different operating bands and subcarrier spacing is degraded

Engineering Contradiction:
Improveadaptability to operating bands and subcarrier spacingVSAvoidcomplexity of dynamic HARQ process management
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies dynamics by making the quantity of active HARQ processes changeable rather than fixed. The network entity dynamically configures the number of active HARQ processes based on operating band and subcarrier spacing conditions, allowing the system to adapt to varying wireless communication requirements while maintaining manageable complexity through controlled dynamic adjustment.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent implements parameter changes by modifying the HARQ process quantity parameter according to operating conditions. The network entity adjusts the number of active HARQ processes as a configurable parameter based on the specific operating band and subcarrier spacing, enabling the system to optimize performance for different wireless environments without requiring complete system redesign.

Inventive Principle:
Principle #35Parameter changes

2Reliability

If the buffer size for each HARQ process is increased, then the reliability of data transmission is improved, but the loss of time for buffer management increases

Engineering Contradiction:
Improvereliability of data transmissionVSAvoidtime for buffer management
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The patent applies local quality by implementing limited buffer rate matching on a per-HARQ-process basis rather than using a uniform buffer management approach. Each active HARQ process is allocated a specific buffer size tailored to its requirements, allowing the system to maintain adequate reliability for each process while reducing overall buffer management time through localized, targeted buffer allocation.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent implements segmentation by dividing the buffer management into separate, independent buffer allocations for each HARQ process. This segmentation allows the system to manage buffers independently for each process, reducing the complexity and time required for overall buffer management while ensuring each process has sufficient buffering capacity for reliable operation.

Inventive Principle:
Principle #1Segmentation

3Productivity

If the quantity of active HARQ processes is dynamically adjusted, then the productivity of data transmission is improved, but the device complexity increases

Engineering Contradiction:
Improveproductivity of data transmissionVSAvoidcomplexity of HARQ feedback mechanism
Core Design Contradiction:
ProductivityVSDevice complexity

Solution Approach 1:

The patent applies feedback by implementing a feedback mechanism where the UE reports HARQ acknowledgments and the network entity uses this feedback to dynamically adjust the quantity of active HARQ processes. This feedback-driven approach enables the system to optimize productivity by adjusting HARQ process quantity based on actual transmission conditions and success rates, while the structured feedback mechanism keeps the complexity manageable through systematic information exchange.

Inventive Principle:
Principle #23Feedback

Data Source

PatentUS12199773B2Hybrid automatic repeat request (HARQ) feedback for active HARQ processes
Publication Date: 2025.01.14 QUALCOMM INC
  • US12199773B2 patent drawing
  • US12199773B2 patent drawing
  • US12199773B2 patent drawing

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network entity, an indication associated with a quantity of active hybrid automatic repeat request (HARQ) processes, wherein the quantity of active HARQ processes is dynamically changeable based at least in part on an operating band and an associated subcarrier spacing. The UE may transmit, to the network entity, HARQ feedback based at least in part on the indication associated with the quantity of active HARQ processes. Numerous other aspects are described.