D2D Synchronization Signal Power Masking for UE Coverage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In device-to-device (D2D) communication, existing wireless communication systems face challenges in efficiently generating and transmitting synchronization signals, particularly in distinguishing between in-coverage and out-of-coverage User Equipments (UEs) for effective blind decoding and power management.
Innovation Solution
A method and apparatus for generating and transmitting synchronization signals based on a cell ID, where the cell ID determines the power mask and transmission characteristics, allowing UEs to differentiate between in-coverage and out-of-coverage UEs, and optimizing the transmission of primary and secondary sidelink synchronization signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronization signals are transmitted by all UEs in D2D communication, then synchronization coverage is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by differentiating transmission behavior based on UE location: in-coverage UEs transmit synchronization signals with specific power masks while out-of-coverage UEs use different power masks. This localized differentiation optimizes power consumption while maintaining synchronization coverage where needed.
Solution Approach 2:
The patent changes the power mask parameter based on UE coverage status. By adjusting the power mask parameter differently for in-coverage and out-of-coverage UEs, the system achieves efficient power management while ensuring adequate synchronization signal transmission in both scenarios.
2Measurement precision
If blind decoding is performed on all synchronization signals, then synchronization detection accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by having UEs pre-determine their coverage status and select appropriate power masks before transmitting synchronization signals. This preliminary classification enables receiving UEs to prioritize blind decoding attempts, reducing processing complexity while maintaining detection accuracy.
Solution Approach 2:
The patent implements partial action by having UEs perform blind decoding preferentially on signals with expected power masks rather than attempting to decode all possible signals. This selective approach reduces processing complexity while maintaining sufficient synchronization detection accuracy.
3Device complexity
If power masks are set uniformly for all synchronization signals, then device complexity is reduced, but power management efficiency deteriorates
Solution Approach 1:
The patent applies local quality by setting different power masks for synchronization signals transmitted by in-coverage UEs versus out-of-coverage UEs. This differentiated approach improves power management efficiency by adapting transmission power to the specific coverage scenario, while the power mask mechanism itself keeps device complexity manageable.
Data Source
AI summary
A method of transmitting a device-to-device (D2D) synchronization signal (SS) in a wireless communication system, includes transmitting to a first D2D user equipment (UE), by a second D2D UE, a primary D2D SS including ID information, the ID information informing whether the second D2D UE is an in-coverage UE or an out-of-coverage UE; and transmitting to the first D2D UE, by the second UE, a secondary D2D SS based on the primary D2D SS, wherein the primary D2D SS is transmitted on a same subframe as the secondary D2D SS and a physical sidelink broadcast channel (PSBCH), and wherein a transient period is included in a transmission region of the secondary D2D SS.