D2D Discovery Signal Transmission on Non-Serving Carriers
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Solution Overview
Problem
Current D2D communication systems are limited to transmitting discovery signals only on the serving carrier frequency used by the serving cell, lacking the ability to operate on non-serving carriers, and do not implement carrier aggregation for enhanced frequency resource efficiency.
Innovation Solution
A method and apparatus for transmitting D2D discovery signals on non-serving carriers and controlling transmission power, enabling inter-carrier D2D discovery and system information exchange between devices and base stations, utilizing carrier aggregation to support D2D communication across multiple frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D discovery signals are transmitted only on serving carrier frequency, then transmission simplicity is maintained, but frequency resource efficiency and D2D communication versatility are limited
Solution Approach 1:
The patent segments D2D discovery signal transmission by separating serving carrier operations from non-serving carrier operations. Devices can selectively transmit and receive discovery signals on different carriers based on configuration, allowing versatile multi-carrier D2D communication while maintaining simple single-carrier operation when needed. The base station configures specific carriers for D2D discovery, enabling devices to operate on multiple frequencies without requiring full multi-carrier complexity.
Solution Approach 2:
The patent implements multi-functionality by enabling the same D2D discovery mechanism to operate on both serving carriers and non-serving carriers. The base station can configure carriers for different purposes (serving or non-serving), and devices can perform D2D discovery on whichever carriers are configured, providing universal D2D discovery capability across multiple frequency resources without requiring separate mechanisms for each carrier type.
2Productivity
If carrier aggregation is implemented for D2D communication, then frequency resource efficiency is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by having the base station pre-configure carriers for D2D discovery before devices attempt D2D communication. The base station identifies which carriers are suitable for D2D operations and configures them in advance, so devices receive ready-to-use carrier configurations without needing to perform complex real-time carrier selection or aggregation management, reducing device complexity while maintaining frequency resource efficiency.
Solution Approach 2:
The base station acts as an intermediary that manages carrier aggregation complexity. It selects and configures appropriate carriers for D2D discovery, handling the complex decisions about which carriers to aggregate and how to allocate resources. Devices simply follow base station configurations, transferring the aggregation management burden from devices to the base station, thereby improving frequency resource efficiency without significantly increasing device complexity.
Data Source
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AI summary
The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as a long term evolution (LTE). A method for transmitting a device to device (D2D) discovery signal by a user equipment (UE) in a communication system supporting a D2D scheme is provided. The method includes determining transmission power for D2D discovery signal transmission, and transmitting a D2D discovery signal using the transmission power, wherein the transmission power is determined by considering a cell at which the D2D discovery signal is transmitted.