D2D Resource Release Signaling for Efficient Radio Allocation
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Solution Overview
Problem
In D2D communication systems, there is a challenge in managing radio resources efficiently, as existing methods struggle to release resources when they are no longer needed, leading to unnecessary resource allocation due to the base station's inability to ascertain the D2D transmission state of user apparatuses.
Innovation Solution
User apparatuses can proactively request resource release through explicit signaling to the base station or set a valid term for resource usage, allowing for timely and efficient resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station eNB does not actively manage resource release for D2D communication, then the user apparatus UE can maintain continuous resource availability for D2D transmission, but the radio resources are wasted when D2D transmission is not actually performed
Solution Approach 1:
The patent implements a feedback mechanism where the base station eNB monitors the actual D2D transmission state of user apparatuses and sends resource release instructions when resources are no longer needed. This feedback loop allows the system to dynamically adjust resource allocation based on actual usage, preventing resource waste while ensuring availability when needed.
Solution Approach 2:
The user apparatus UE autonomously reports its D2D transmission state to the base station eNB, enabling the base station to make informed resource management decisions. This self-service approach allows the system to efficiently release resources without continuous active management overhead, balancing resource availability with waste prevention.
2Productivity
If the base station eNB continuously monitors D2D transmission state to manage resources, then resource allocation can be optimized, but the system complexity and signaling overhead increase
Solution Approach 1:
The base station eNB pre-configures resource pools and allocation parameters for D2D communication before actual transmission begins. This preliminary setup reduces the need for continuous monitoring and complex real-time decision-making, simplifying the base station's ongoing management while maintaining efficient resource allocation.
Solution Approach 2:
The user apparatus UE autonomously reports its transmission state and resource usage to the base station, shifting part of the monitoring burden from the base station to the user equipment. This reduces the base station's complexity while still enabling optimized resource allocation based on actual usage conditions.
3Ease of operation
If semistatic resource assignment is used for D2D communication, then resource allocation is simplified and faster, but resources cannot be released when no longer needed
Solution Approach 1:
The patent combines semistatic resource assignment with dynamic release mechanisms. Resources are initially assigned using simple semistatic allocation for rapid setup, but the base station eNB maintains the ability to dynamically release these resources when D2D transmission ceases. This hybrid approach preserves the simplicity of semistatic assignment while adding the flexibility needed to prevent resource waste.
Data Source
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AI summary
A user apparatus for use in a mobile communication system that supports D2D communication, including: D2D communication means that transmits a D2D signal to another user apparatus by using a resource for D2D communication assigned from a base station in the mobile communication system; and resource control means that transmits, to the base station, a resource release request signal for requesting release of a resource for D2D communication assigned from the base station.