Base Station D2D Resource Relay for Cross-Cell Communication
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Solution Overview
Problem
In mobile communication systems, base stations fail to notify neighboring stations of Device-to-Device (D2D) resources across different cells, leading to incomplete D2D radio signal reception between user terminals in non-adjacent cells, resulting in reduced service effectiveness while increasing overheads.
Innovation Solution
A communication control method where a first base station transmits a resource message to a neighboring base station, including information on its own D2D resources and those of another neighboring base station, enabling the creation of new D2D reception resources by combining these resources, thus facilitating D2D communication between user terminals in different cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a base station notifies only neighboring base stations of D2D resources via X2 interface, then overheads are suppressed, but user terminals in non-adjacent cells cannot receive D2D radio signals
Solution Approach 1:
The patent introduces an intermediary mechanism where the first base station acts as a mediator to forward D2D resource information from the second base station to the third base station. This allows the third base station to obtain D2D resource information from non-adjacent cells without requiring direct X2 connections, thus maintaining low overheads while enabling reliable D2D signal reception across cell boundaries.
2Reliability
If a base station establishes X2 connections with all base stations to share D2D resources, then D2D signal reception is enabled across all cells, but overheads increase significantly
Solution Approach 1:
The patent segments the D2D resource information sharing process into hierarchical levels: direct neighboring base stations share information bidirectionally, while non-adjacent base stations receive information through intermediary base stations. This segmentation avoids the need for all-base-station connections, reducing overheads while maintaining comprehensive D2D coverage.
3Loss of energy
If D2D resource information is shared only between directly connected base stations, then overheads are minimized, but service coverage is limited to adjacent cells
Solution Approach 1:
The patent enables base stations to perform multiple functions: they serve as both information sources for their own cells and as information relays for non-adjacent cells. The first base station, for example, receives D2D resource information from the second base station and forwards it to the third base station, making the system universally applicable across the entire network rather than being limited to point-to-point connections.
Data Source
AI summary
A communication control method according to a present embodiment comprises: a step of transmitting, by a first base station, to a third base station that is a neighboring base station of the first base station, a first resource message relating to a first D2D resource used for the D2D proximity service in the first base station. The first resource message includes information on the first D2D resource and a second D2D resource used for the D2D proximity service in a second base station that is a neighboring base station of the first base station.