D2D Resource Allocation via Secondary Cell Load Reduction
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Solution Overview
Problem
In device-to-device (D2D) communication, the primary cell becomes overloaded when multiple user equipment simultaneously transmit D2D discovery messages, leading to inadequate resources and increased load.
Innovation Solution
Allocating D2D communication resources from a secondary cell or non-serving cell, allowing user equipment to use these resources for communication, thereby reducing the load on the primary cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If D2D discovery messages are transmitted only in the primary cell, then user equipment can conveniently use the resource to transmit D2D discovery messages, but resources on the primary cell become inadequate and load on the primary cell is increased
Solution Approach 1:
The patent segments the resource allocation by introducing a second cell as a separate resource pool for D2D discovery messages. This divides the original single-cell resource constraint into multiple independent resource pools (first cell and second cell), allowing UE to transmit discovery messages in either cell based on availability and configuration, thereby distributing the load and increasing overall resource availability.
2Productivity
If multiple user equipment simultaneously use primary cell resources to transmit D2D discovery messages, then D2D communication functionality is achieved, but load on the primary cell is increased
Solution Approach 1:
The patent introduces a spatial dimension by configuring a second cell as an additional resource pool for D2D discovery. This transforms the single-dimension resource constraint (one cell) into a multi-dimensional resource space (multiple cells), allowing multiple UEs to simultaneously transmit discovery messages across different cells, thereby maintaining D2D communication productivity while distributing and reducing the load pressure on any single cell.
Data Source
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AI summary
The present invention relates to the field of communications technologies, and provides a resource allocation method, device, and system, so as to resolve a problem of increased load of an existing primary cell. The method provided in the embodiments of the present invention includes: determining, by a first base station, whether user equipment can perform D2D communication in a first cell, where the first cell is a secondary cell or a non-serving cell of the user equipment; when the first base station determines that the user equipment can perform D2D communication in the first cell, transmitting, by the first base station, a response message to the user equipment, so that the user equipment performs D2D communication in the first cell, where the response message is used to provide a D2D communication resource of the first cell to the user equipment; and when the first base station determines that the user equipment cannot perform D2D communication in the first cell, transmitting, by the first base station, a reply message to the user equipment, to notify that the user equipment cannot perform D2D communication in the first cell.