D2D Discovery Signal Proximity Validation
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Solution Overview
Problem
Current D2D communication systems face inefficiencies in sending and receiving discovery signals, leading to unnecessary power consumption and interference due to repeated responses to periodic discovery requests, which are not validated for proximity.
Innovation Solution
A method that determines the validity of proximity by measuring time intervals using a timer and only transmits discovery response signals when proximity is deemed invalid, thereby optimizing signal transmission and reducing unnecessary responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each UE sends a discovery response signal whenever a periodic discovery request signal is received, then the discovery process is thorough, but unnecessary power consumption and interference are generated
Solution Approach 1:
The system performs preliminary validation of proximity validity before requiring response transmissions. By pre-determining which UEs are in valid proximity relationships, the system avoids unnecessary response signals from UEs that are not actual targets, thereby reducing power consumption while maintaining discovery completeness for valid targets.
Solution Approach 2:
Instead of requiring all UEs to respond to all discovery requests, the system applies partial action by limiting responses only to UEs that have been validated as actual proximity targets. This selective response mechanism reduces overall system activity and power consumption while maintaining adequate discovery coverage.
2Reliability
If each UE sends a discovery response signal whenever a periodic discovery request signal is received, then all potential devices are discovered, but interference with other UEs is generated
Solution Approach 1:
The system performs preliminary validation of proximity relationships before the discovery request transmission phase. By pre-identifying valid target UEs for each discovering UE, the system enables selective response transmission that maintains discovery completeness for valid targets while eliminating unnecessary responses that would cause interference to other UEs.
Solution Approach 2:
The system converts the potentially harmful effect of widespread response transmissions into a benefit by using the proximity validation information to suppress unnecessary responses. The validation mechanism transforms what would be interfering signals into a filtering criterion, benefiting overall system performance by reducing interference while maintaining necessary discovery functionality.
3Reliability
If discovery request signals are transmitted periodically and repeatedly, then reliable device discovery is achieved, but unnecessary responses increase power consumption
Solution Approach 1:
The system performs preliminary validation of proximity relationships before the periodic discovery request transmission begins. This pre-validation creates a reference set of legitimate targets, enabling receiving UEs to selectively respond only to requests from valid discoverers, thereby maintaining discovery reliability while significantly reducing power consumption from unnecessary periodic responses.
Solution Approach 2:
The system uses proximity validation results as feedback to control response behavior. By continuously referencing the pre-determined validity information, UEs can adjust their response decisions based on whether the requesting UE is a legitimate target, creating a feedback mechanism that maintains reliable discovery while minimizing unnecessary energy expenditure.
Data Source
AI summary
Provided are a method for transmitting/receiving discovery signals in a wireless communication system and user equipment for supporting same. The method involves receiving a discovery request signal from user equipment, and determining whether or not to transmit a discovery response signal in response to the discovery request signal on the basis of the determination of the validity of proximity of the user equipment.