D2D Discovery MS Periodic Request Signal Power Reduction
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Solution Overview
Problem
In Device-to-Device (D2D) communication networks, existing discovery methods consume unnecessary power as devices transmit discovery signals regardless of the presence of neighboring devices, leading to inefficient resource allocation and increased power consumption.
Innovation Solution
A method and apparatus where a discovery Mobile Station (MS) broadcasts a discovery request signal at a predetermined period, and operates in active or idle mode based on receiving a discovery request signal, allowing discovered MSs to conserve power by entering idle mode until the next discovery request time if no signal is received, and transitioning to active mode to transmit discovery information when a signal is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discovered MS transmits discovery signal periodically to enable neighbor recognition, then neighbor device discovery capability is improved, but power consumption increases due to unnecessary signaling when no discovery MS exists
Solution Approach 1:
The patent applies preliminary action by having the discovery MS transmit a discovery request signal before the actual discovery signal transmission. This preliminary request allows the discovered MS to activate its transmission resources only when needed, preventing unnecessary power consumption while maintaining reliable neighbor discovery capability.
2Reliability
If discovery MS searches all discovery resources to receive discovery signal, then complete neighbor recognition is achieved, but power consumption increases due to continuous monitoring
Solution Approach 1:
The patent implements periodic action by establishing a periodic discovery request signal transmission mechanism. The discovery MS transmits request signals at predetermined intervals, allowing the discovered MS to monitor only during these periodic intervals rather than continuously, thus reducing power consumption while maintaining complete neighbor recognition.
3Adaptability or versatility
If centralized method allocates transmission and reception resources dynamically, then resource allocation flexibility is improved, but system complexity increases due to dynamic signaling requirements
Solution Approach 1:
The patent applies self-service by enabling the discovery MS to autonomously manage resource allocation through the discovery request signal mechanism. The discovered MS automatically activates its transmission resources when receiving a discovery request, eliminating the need for complex centralized dynamic signaling while maintaining resource allocation flexibility.
Data Source
AI summary
A method of a Mobile Station (MS) for discovering neighbor MSs in a Device to Device (D2D) network includes broadcasting, by a discovery MS, a discovery request signal for discovering neighbor MSs, using a discovery request resource region repeated with a first period, if a neighbor MS discovery event is detected; and receiving, by the discovery MS, a discovery signal from at least one of other MSs in response to the discovery request signal, using a discovery resource region repeated with a second period. Other embodiments including a method for a central node discovering neighbor MSs and a discovery MS and a central node are also disclosed.