D2D Control Information Exchange for Distributed Resource Allocation

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Solution Overview

Problem

Existing technologies face challenges in efficiently controlling device-to-device (D2D) communication, particularly in scenarios with multiple links competing for resources and experiencing frequent changes due to mobility, where centralized coordination is not available.

Innovation Solution

A method where a first D2D communication device receives control information from one or more second D2D communication devices and determines its own control information based on this received information, enabling efficient control of D2D communication links.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a centralized coordination mechanism is used to control D2D communication, then resource allocation and QoS management can be optimized, but system complexity and coordination overhead increase significantly

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidcoordination mechanism complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Each D2D communication device independently determines its own control information (transmit power, precoder, transmission timing) based on received control information from other devices, without requiring centralized coordination. This self-service approach reduces system complexity while maintaining resource allocation efficiency through distributed decision-making

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Devices exchange control information containing channel state information, interference levels, and QoS requirements. Each device uses this feedback from other devices to optimize its transmission parameters, achieving coordinated resource allocation through iterative feedback loops rather than centralized control

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If distributed computation of transceiver vectors is implemented, then system adaptability to mobility improves, but difficulty in handling multiple coexisting links and QoS constraints increases

Engineering Contradiction:

Improvemobility adaptabilityVSAvoidlink parameter optimization difficulty

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The control information determination process is segmented into independent components: channel estimation, interference measurement, control information reception, and parameter optimization. Each component can be computed separately using distributed algorithms, making the overall system more manageable despite multiple coexisting links

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Devices perform iterative optimizations of their control parameters, making partial adjustments in each iteration rather than attempting to optimize all parameters simultaneously. This approach handles the complexity of multiple links by breaking down the optimization into manageable steps that converge to a satisfactory solution

Inventive Principle:

Principle #16Partial or excessive action

3Device complexity

If D2D devices make independent transmission decisions without control information exchange, then system simplicity is maintained, but resource utilization efficiency and QoS guarantee capability deteriorate

Engineering Contradiction:

Improvecontrol mechanism simplicityVSAvoidsystem sum-rate

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

Devices exchange control information containing channel state information, interference measurements, and QoS requirements. This feedback enables each device to make informed transmission decisions that consider the state of other links, improving overall system sum-rate while maintaining relatively simple distributed control

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent combines multiple functions into the control information exchange mechanism: channel state sharing, interference coordination, QoS requirement communication, and transmission parameter optimization. This merging allows devices to achieve coordinated resource allocation through a single integrated information exchange process rather than multiple separate mechanisms

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12219627B2Control information exchange for control of D2D communication

Publication Date: 2025.02.04 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Control information exchange for control of D2D communication A first D2D communication device (10) receives first information from one or more second D2D communication devices (10). The first information indicates control information for one or more links from the respective second D2D communication device (10). Based on the indicated control information, the first D2D communication device (10) determines control information for one or more links from the first D2D communication device (10).