D2D Discovery Message Transmission in Non-Supporting Cells
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Solution Overview
Problem
In 5G communication systems, D2D UEs face challenges in transmitting D2D discovery messages when the serving cell does not support the D2D discovery process, leading to limitations such as inability to transmit messages and load imbalance due to cell reselection on frequencies supporting D2D discovery processes.
Innovation Solution
A method and apparatus for transmitting D2D discovery messages by detecting the need for message transmission in a serving cell that does not support D2D, performing cell detection to find alternative cells broadcasting system information, and reselecting the cell for message transmission using available resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a D2D UE transmits D2D discovery messages in a serving cell that does not support D2D discovery process, then the UE can perform D2D discovery, but the cell reselection causes load imbalance and communication failure
Solution Approach 1:
The patent introduces an intermediary mechanism where the network side (base station) provides assistance information to guide D2D UEs in selecting appropriate cells for D2D discovery. This intermediary guidance prevents UEs from randomly selecting cells, thereby avoiding load imbalance and ensuring reliable message transmission.
Solution Approach 2:
The patent implements a feedback mechanism where the network broadcasts assistance information about suitable cells for D2D discovery. UEs use this feedback information to make informed cell selection decisions, ensuring they operate in cells that actually support D2D functionality, thus improving transmission reliability.
2Adaptability or versatility
If D2D UEs perform cell reselection to frequencies supporting D2D discovery processes, then D2D discovery can be performed, but load imbalance occurs
Solution Approach 1:
The network acts as an intermediary by providing assistance information that guides D2D UEs to select cells with appropriate D2D support. This coordinated approach ensures even load distribution across the network while maintaining D2D discovery functionality.
Solution Approach 2:
The patent changes the parameter of cell selection criteria by introducing assistance information from the network. Instead of UEs independently selecting cells based on signal strength alone, they now consider D2D capability parameters provided by the network, leading to balanced load distribution.
3Ease of operation
If the serving cell does not support D2D discovery process, then the UE cannot transmit D2D discovery messages, but the UE still needs to perform D2D discovery
Solution Approach 1:
The network provides assistance information as an intermediary guide, enabling UEs to perform D2D discovery operations even when the current serving cell does not natively support D2D. This intermediary guidance allows UEs to successfully transmit discovery messages by redirecting them to appropriate cells.
Data Source
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 discovery message in a communication system is provided. The method includes detecting a need for transmitting a discovery message in a serving cell in which a direct discovery process is unsupportable; detecting a cell other than the serving cell; and transmitting the discovery message based on system information if the system information is broadcasted in the cell.