Adaptive D2D Synchronization Signal Transmission for Energy Efficiency
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Solution Overview
Problem
Device-to-device (D2D) synchronization signal transmission in wireless networks consumes significant energy, particularly affecting devices out of coverage, as they continuously transmit periodic synchronization signals to maintain synchronization, which is not necessary for all scenarios.
Innovation Solution
A method and apparatus for a UE to determine its interest in being received by another UE and adapt the time pattern for transmitting synchronization signals or broadcast channels, allowing for reduced transmissions by determining the level of interest based on service type, coverage states, and synchronization references, enabling periodic, aperiodic, or no transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic synchronization signals are transmitted continuously, then synchronization reliability is maintained, but energy consumption increases significantly
Solution Approach 1:
The patent applies dynamics by making the synchronization signal transmission pattern adaptable rather than fixed. The transmitting UE dynamically adjusts its transmission behavior based on real-time determination of interest levels from receiving UEs. When interest is detected, periodic signals are transmitted; when interest is not detected, transmission is suppressed or aperiodic, thereby optimizing the balance between synchronization reliability and energy consumption.
Solution Approach 2:
The patent changes the transmission parameter from continuous periodic to adaptive variable frequency. By determining interest levels and adjusting transmission accordingly, the system transitions from a fixed transmission pattern to a variable one that responds to network conditions, reducing unnecessary transmissions while maintaining synchronization when needed.
2Adaptability or versatility
If synchronization signals are transmitted to all UEs, then coverage is maximized, but overhead increases unnecessarily
Solution Approach 1:
The patent applies local quality by differentiating transmission behavior based on the specific receiving UE's interest level. Rather than uniform transmission to all UEs, the system tailors its approach locally - transmitting periodically to UEs with detected interest and suppressing or using aperiodic transmission to UEs without interest, thereby reducing overall overhead while maintaining necessary coverage.
Solution Approach 2:
The patent implements partial action by transmitting synchronization signals only to the extent necessary - i.e., only to UEs that have demonstrated interest. This selective transmission avoids excessive action (transmitting to uninterested UEs) while ensuring adequate action (transmitting to interested UEs) is maintained.
3Ease of manufacture
If fixed periodic transmission pattern is used, then implementation is simple, but energy efficiency deteriorates
Solution Approach 1:
The patent uses periodic action as the default transmission mode when interest is detected, maintaining simplicity for common scenarios. However, this periodic action is conditional - it only applies when UEs demonstrate interest, allowing the system to switch to aperiodic or suppressed transmission when interest is absent, thereby improving energy efficiency without significantly complicating implementation.
Data Source
AI summary
A method and apparatus in a first User Equipment (UE) that reduces the number of required transmissions when transmitting device-to-device (D2D) synchronization signals or broadcast channels in a wireless network. The first UE determines its level of interest in being received by a second UE that is within network coverage, and adapts a time pattern for transmission of synchronization signals or broadcast channels, depending on the determined level of interest of the first UE. The first UE's interest may be determined by analyzing a type of service that the first UE is interested in performing, and concluding the first UE is interested in being received by the second UE only when the first UE is interested in performing a certain type of service.