D2D Discovery Signal Control via Identifier-Based Overhead Reduction
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Solution Overview
Problem
In D2D communication, the existing methods for controlling discovery signals result in increased overhead due to network apparatus transmission of conditions for regulating signal transmission and reception, leading to radio resource consumption and security concerns.
Innovation Solution
A user terminal and network apparatus implement a discovery signal list with identifiers and conditions for controlling signal transmission and reception, where the network apparatus transmits specific identifiers to the user terminal, allowing it to set transmission conditions, thereby reducing overhead by minimizing unnecessary information exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a network apparatus transmits predetermined conditions for regulating discovery signal transmission to a user terminal, then the user terminal can control discovery signal transmission, but overhead increases due to transmission of control information
Solution Approach 1:
The patent extracts only the essential control information needed for discovery signal regulation from the complete set of possible control parameters. Instead of transmitting all predetermined conditions, the network apparatus transmits a simplified subset of control items that are most critical for maintaining reliability while minimizing overhead.
Solution Approach 2:
The control information is segmented into multiple components, with only the necessary portions being transmitted to the user terminal. The patent divides the complete control parameter set into essential control items and optional items, transmitting only the essential ones to reduce overhead while preserving core control functionality.
2Reliability
If a network apparatus transmits predetermined conditions for regulating discovery signal reception to a user terminal, then the user terminal can control discovery signal reception, but overhead increases due to transmission of control information
Solution Approach 1:
The patent extracts only the essential control information needed for discovery signal reception regulation from the complete set of possible control parameters. Instead of transmitting all predetermined conditions, the network apparatus transmits a simplified subset of control items that are most critical for maintaining reliability while minimizing overhead.
Solution Approach 2:
The control information is segmented into multiple components, with only the necessary portions being transmitted to the user terminal. The patent divides the complete control parameter set into essential control items and optional items, transmitting only the essential ones to reduce overhead while preserving core control functionality.
3Adaptability or versatility
If a user terminal freely transmits discovery signals, then discovery capability is enhanced, but interference with nearby user terminals occurs
Solution Approach 1:
The patent implements dynamic control of discovery signal transmission by allowing the user terminal to adjust transmission parameters based on received control information from the network apparatus. The terminal can dynamically modify transmission power, timing, and frequency resources to maintain discovery capability while avoiding interference with nearby terminals.
Solution Approach 2:
The network apparatus provides feedback to the user terminal through transmitted control information, enabling the terminal to regulate its discovery signal transmission. This feedback mechanism allows the terminal to adapt its transmission behavior to avoid interference while maintaining effective discovery capability.
Data Source
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AI summary
A user terminal according to the present invention is a user terminal in a mobile communication system supporting D2D communication being direct terminal-to-terminal communication. The user terminal includes: a storage configured to store a discovery signal list relating: to a plurality of conditions for controlling transmission and/or reception of a discovery signal used for discovery of another user terminal existing near the user terminal; and to a plurality of identifiers consisting of identifiers respectively associated with the plurality of conditions; a receiver configured to receive a specific identifier specified by a network apparatus storing the discovery signal list, wherein the specific identifier is specified from among the plurality of identifiers; and a controller configured to perform control to transmit and/or receive the discovery signal according to a specific condition associated with the specific identifier from among the plurality of conditions.