Sidelink Synchronization Resource Selection for 5G UE
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Solution Overview
Problem
The challenge in 5G wireless communication systems is the severe propagation loss at extremely high frequency bands, such as millimeter wave frequencies, which affects the efficiency and reliability of sidelink synchronization signals, particularly in scenarios where UEs may lose synchronization with the network clock.
Innovation Solution
A method for a user equipment (UE) to identify and utilize a pool of resources for transmitting sidelink synchronization signals, including UE-specific resources, to synchronize with peer UEs, allowing for on-demand or opportunistic resource selection and synchronization, even when disconnected from the network clock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink synchronization signals are transmitted using conventional resources at mmW frequencies, then network coverage can be maintained, but severe propagation loss occurs reducing synchronization reliability
Solution Approach 1:
The resource pool is segmented into conventional resources and UE-specific resources, allowing the system to switch between transmission modes depending on synchronization needs and propagation conditions
Solution Approach 2:
The patent changes transmission parameters by introducing UE-specific resources with modified time-frequency structures and power allocation, optimizing signal propagation characteristics at mmW frequencies
2Productivity
If UE-specific resources are allocated for sidelink synchronization signals, then synchronization efficiency is improved, but resource pool complexity increases
Solution Approach 1:
UE-specific resources are pre-configured and identified in advance through resource pool indication, allowing UEs to efficiently select appropriate resources without real-time complex decision-making
Solution Approach 2:
The resource pool structure is made dynamic through configurable parameters that allow the network to adapt the complexity level based on deployment scenarios and UE capabilities
3Adaptability or versatility
If on-demand resource selection is implemented, then adaptability to varying synchronization needs is improved, but resource management complexity increases
Solution Approach 1:
UEs autonomously select resources from the indicated pool based on their own synchronization needs and channel conditions, eliminating the need for complex centralized resource allocation
Solution Approach 2:
The system implements feedback mechanisms where UEs report synchronization status and resource usage, allowing the network to dynamically adjust resource pool configurations
Data Source
AI summary
In an embodiment, a UE identifies a pool of resources where transmission of sidelink synchronization signals is permitted, the pool of resources including at least UE-specific resources, and transmits a sidelink synchronization signal to one or more peer sidelink UEs based on a subset of the pool of resources. In another embodiment, a UE transmits a synchronization request message to at least one peer sidelink UE, and receives at least one sidelink synchronization signal from the at least one peer sidelink UE in response to the transmission of the synchronization request message.