D2D Reliability Alarm for Isolated Device Synchronization
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Solution Overview
Problem
Mobile devices that become isolated from network synchronization signals due to moving out of coverage area face challenges in re-establishing synchronization, especially in dense device scenarios where resources are occupied, leading to unreliable timing and difficulty in recognizing or merging with other clusters having reliable timing.
Innovation Solution
Implementing a reliability alarm system that uses reserved D2D resources to alert isolated mobile devices of nearby reliable synchronization signals, allowing them to free resources and synchronize with the network, and subsequently transmit their own reliability alarms to help other isolated devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mobile devices use all available D2D resources for communication in dense scenarios, then device-to-device communication capacity is maximized, but synchronization signal reception becomes impossible and devices remain isolated from network timing
Solution Approach 1:
The patent segments D2D resources into different types: synchronization resources dedicated for receiving synchronization signals and reliability alarm resources for detecting alarm signals. This segmentation allows devices to maintain communication capacity on data resources while ensuring dedicated resources remain available for synchronization and alarm functions, resolving the contradiction between maximizing communication capacity and maintaining synchronization reliability.
2Reliability
If isolated mobile devices free resources to receive synchronization signals, then synchronization reliability improves, but device-to-device communication capacity decreases
Solution Approach 1:
The patent implements preliminary action by having devices transmit reliability alarms before actual synchronization signals are received. This allows isolated devices to proactively detect the presence of synchronization sources and prepare for synchronization by freeing resources in advance, improving synchronization reliability without causing immediate loss of communication capacity.
Solution Approach 2:
The reliability alarm serves as an intermediary signal between the synchronization source and the isolated device. Instead of directly requiring isolated devices to free resources for synchronization signals, the alarm mechanism provides intermediate information about synchronization availability, allowing devices to make informed decisions about resource allocation and maintain communication capacity while improving synchronization reliability.
3Loss of information
If mobile devices transmit reliability alarms on reserved resources, then isolated devices can detect synchronization opportunities, but resource availability for other communications is reduced
Solution Approach 1:
The patent applies local quality by allocating specific D2D resources with specialized functions: reliability alarm resources are dedicated for alarm transmission while other D2D resources maintain their communication functions. This localized resource allocation ensures that synchronization information detection is enabled on specific resources without reducing the quantity of resources available for general communication purposes.
Data Source
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AI summary
Methods, systems, and devices are described that provide for D2D synchronization. The methods, systems, and/or devices may include tools and techniques that provide for synchronizing a mobile device based on detection of a reliability alarm. A reliability alarm may be used between mobile devices, which is transmitted and/or received on specific D2D resources. Since the resources are reserved for the reliability alarm, a mobile device which was previously isolated from network synchronization will be able to receive the reliability alarm that a reliable synchronization signal is close when it moves within range of a reliable device. Once a reliability alarm is received the mobile device may free other resources to allow it to receive synchronization signals from the reliable devices. The mobile device may then synchronize with the network based on the received synchronization signals and transmit its own reliability alarm for subsequent isolated devices to use.