Groupcast Feedback Resource Allocation Under Device-Count Constraints

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Solution Overview

Problem

Existing resource allocation solutions for feedback in groupcast communication are inefficient, leading to high resource consumption and difficulty in identifying failed data receptions due to the large number of destination devices, especially in limited resource scenarios.

Innovation Solution

A method of resource allocation that includes allocating specific resources to individual destination devices and shared resources among groups, allowing for differentiated feedback transmission types and portions, thereby optimizing resource usage and facilitating identification of failed receptions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional cellular communication resource allocation is used for D2D groupcast communication, then resource allocation can be provided, but resource consumption becomes high and identification of failed receptions becomes difficult

Engineering Contradiction:

Improvefeedback transmission efficiencyVSAvoidresource consumption

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent segments the groupcast communication resources by dividing destination devices into multiple groups, with each group allocated dedicated feedback resources. This segmentation reduces overall resource consumption by avoiding universal resource allocation to all devices, while improving feedback efficiency through organized group-based feedback transmission.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of allocating dedicated resources to each individual destination device (which increases resource consumption), the patent inverts the approach by allocating shared resources to groups of destination devices. This inversion reduces resource consumption while maintaining feedback capability through group-based identification of failed receptions.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If resources are allocated to all destination devices for feedback transmission, then feedback can be received from all devices, but resource consumption increases significantly

Engineering Contradiction:

Improvefeedback reception completenessVSAvoidallocated resources

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent merges multiple destination devices into groups that share common feedback resources. By combining devices into groups rather than treating them individually, the system maintains complete feedback reception capability while significantly reducing the total quantity of allocated resources compared to individual device allocation.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates universal feedback resources that serve multiple destination devices within a group. These shared resources perform the multi-functional role of collecting feedback from any device in the group, reducing the need for device-specific resources while maintaining complete feedback coverage.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Loss of energy

If shared resources are allocated to groups of destination devices, then resource consumption is reduced, but identification of specific failed receptions becomes more difficult

Engineering Contradiction:

Improveresource consumptionVSAvoidfailed reception identification

Core Design Contradiction:

Loss of energyVSDifficulty of detecting and measuring

Solution Approach 1:

The patent implements feedback mechanisms where destination devices transmit feedback information on shared group resources. The source device receives this feedback and can identify failed receptions by analyzing which devices did not provide expected feedback, thus resolving the difficulty of identification while maintaining resource efficiency.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces group-based feedback resources as intermediaries between individual destination devices and the source device. These intermediary shared resources enable efficient resource usage while providing the source device with information needed to identify which specific devices failed to receive data correctly.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12452001B2Resource allocation for feedback in groupcast communication

Publication Date: 2025.10.21 NEC CORP

AI summary

Embodiments of the present disclosure relate to resource allocation for feedback in groupcast communication. A method comprises identifying a plurality of destination devices for reception of data from a source device in groupcast communication; in response to the number of the plurality of destination devices being below a threshold, allocating resources to the plurality of destination devices to enable feedback transmission associated with the reception by the plurality of destination devices; and in response to the number of the plurality of destination devices exceeding the threshold, disabling feedback transmission associated with the reception by the plurality of destination devices. By flexibly allocating resources to the destination devices, it is possible to facilitate identifying destination devices that miss the data or control information and save the resource consumption.