Wireless Device Synchronization Signal Management
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Solution Overview
Problem
In device-to-device (D2D) communication, D2D UEs outside network coverage rely on in-network UEs for synchronization, leading to unnecessary radio resource and power consumption, as synchronization signals are transmitted without ensuring their necessity.
Innovation Solution
Defining distinct synchronization signals, SYNC1 and SYNC2, where SYNC1 indicates network synchronization and SYNC2 is unrelated to the network, allowing UEs to transmit only when needed, with specific sequences and timing to manage synchronization efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If in-network UEs continuously transmit synchronization signals to support out-of-network UEs, then synchronization reliability is improved, but power consumption and radio resource usage increase
Solution Approach 1:
The patent applies dynamics by making the synchronization signal transmission state changeable. UEs can dynamically switch between transmitting and non-transmitting states based on whether out-of-network UEs are detected. This resolves the contradiction by allowing the system to maintain reliability when needed (when out-of-network UEs are present) while reducing power consumption when not needed (when all UEs are in-network).
Solution Approach 2:
The patent implements feedback mechanisms where UEs monitor the network environment and adjust their transmission behavior accordingly. Through detection of out-of-network UEs and feedback to the network, the system can dynamically control synchronization signal transmission, ensuring reliability only when necessary and thereby reducing unnecessary power consumption and radio resource usage.
2Reliability
If in-network UEs continuously transmit synchronization signals, then synchronization availability is improved, but radio resource consumption increases
Solution Approach 1:
The patent makes radio resource usage dynamic by allowing synchronization signal transmission to be activated or deactivated based on actual need. When all UEs are within network coverage, transmission is stopped, conserving radio resources. When out-of-network UEs are detected, transmission is activated to ensure synchronization availability, thus resolving the contradiction between availability and resource consumption.
Solution Approach 2:
The patent changes the transmission parameter (whether to transmit synchronization signals) based on network conditions. By monitoring UE distribution and adjusting the transmission parameter accordingly, the system maintains synchronization availability when needed while minimizing radio resource consumption when not needed, effectively resolving the contradiction.
3Reliability
If synchronization signals are transmitted without verifying necessity, then synchronization coverage is improved, but resource efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by having UEs perform detection and verification before transmitting synchronization signals. The network first checks whether out-of-network UEs exist, and only then activates synchronization signal transmission. This preliminary verification ensures that synchronization coverage is provided only when necessary, thereby maintaining resource efficiency while ensuring adequate coverage.
Solution Approach 2:
The patent uses feedback mechanisms to verify the necessity of synchronization signal transmission. Through monitoring and detection feedback, the network determines whether out-of-network UEs are present and adjusts transmission accordingly. This feedback-driven approach ensures synchronization coverage is maintained when needed while avoiding unnecessary transmissions that would reduce resource efficiency.
Data Source
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AI summary
Systems and techniques for synchronization between in-coverage and out-of coverage user devices. A base station configures in-coverage and out-of coverage synchronization signals and configures user devices to recognize synchronization signals as in-coverage or out-of-coverage. An in-coverage device furnishes an in-coverage synchronization signal upon detection of an out-of coverage signal, and may continue to furnish the signal upon continued detection of an out-of-coverage signal that is not synchronized to the network. An out-of-coverage device may receive and synchronize to an in-coverage signal if available, or an out-of-coverage signal if available, or may generate and transmit its own out-of-coverage signal if no in-coverage or out-of-coverage signal is available. Signals may include rank information to indicate relay sequence information, and user devices may be configured to respond to signals based on the rank information - such as favoring a signal whose rank indicates that the signal represents a lower relay order number.