D2D Communication Control in LTE Cellular Networks
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Solution Overview
Problem
Current mobile communication systems lack a designed specification for effectively controlling Device-to-Device (D2D) communication, which hinders seamless integration and management of D2D communication within LTE cellular networks.
Innovation Solution
A mobile communication system architecture that includes both D2D supporting and non-supporting cells, where the base station transmits system information blocks indicating permission for D2D communication, allowing user equipment to transition from an idle state to a connected state and perform handovers from D2D non-supporting cells to supporting cells for D2D communication, enabling D2D communication even in non-supporting cells under LTE standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication is integrated into LTE cellular networks, then communication efficiency is improved, but device complexity increases due to lack of designed specification
Solution Approach 1:
The patent segments the cellular network into D2D supporting cells and D2D non-supporting cells, allowing D2D communication to be enabled in specific cells while maintaining traditional cellular communication in others. This segmentation approach enables gradual integration of D2D functionality without requiring complete system redesign, thus improving communication efficiency while managing device complexity through selective deployment.
2Adaptability or versatility
If user equipment transitions from idle state to connected state for D2D communication, then D2D communication capability is improved, but loss of time increases due to state transition
Solution Approach 1:
The base station performs preliminary actions by pre-configuring D2D communication parameters and resources in the system information broadcast before the user equipment needs to engage in D2D communication. This allows user equipment to have D2D capability ready in advance, reducing the time required for state transitions and enabling faster initiation of D2D communication when needed.
3Adaptability or versatility
If handover from D2D non-supporting cell to D2D supporting cell is performed, then D2D communication support is improved, but loss of time increases due to handover process
Solution Approach 1:
The patent implements feedback mechanisms where user equipment continuously measures signal quality and provides measurement reports to the base station. The base station uses this feedback to make informed handover decisions, selecting optimal target cells for D2D communication. This feedback-driven approach reduces unnecessary handovers and optimizes handover timing, thereby minimizing handover time while ensuring D2D communication support is properly established.
Data Source
AI summary
A mobile communication system includes a base station that configures a plurality of cells. The plurality of cells include D2D supporting cell that supports D2D communication in which data communication is directly performed between terminals and D2D non-supporting cell that does not support the D2D communication. The base station transmits D2D information indicating that the D2D communication is permitted in the base station. Based on a measurement report received from a user equipment, the base station is further configured to perform handover of the user equipment from the D2D non-supporting cell to the D2D supporting cell, after receiving notification information from the user equipment indicating an interest in performing the D2D communication by the user terminal.