Sidelink Synchronization via Component Carrier Priorities
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Solution Overview
Problem
Existing wireless communication systems face challenges in sidelink synchronization, particularly in carrier aggregation (CA) scenarios, where some UEs may not be synchronized, leading to loss of transmissions and decreased reliability.
Innovation Solution
The proposed techniques enable synchronization and backwards compatibility for carrier aggregation in sidelink communications by configuring user equipment (UE) with indications of component carriers and priorities for synchronization, allowing UEs to select synchronization sources based on received signal power and synchronization source priorities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is implemented in sidelink communications, then the data rate and communication capacity are improved, but synchronization reliability deteriorates because some UEs may not be synchronized
Solution Approach 1:
The network configures UEs with multiple component carriers and their associated priorities before sidelink communication begins. This preliminary configuration ensures that UEs have pre-established synchronization references and selection criteria, enabling reliable synchronization even when some UEs miss initial synchronization signals.
Solution Approach 2:
UEs measure the RSRP of synchronization signals on different component carriers and use this feedback information to select the most appropriate synchronization source. The UE reports or acts based on the measured signal quality, ensuring that synchronization is maintained with the best available reference.
2Adaptability or versatility
If multiple component carriers are configured for synchronization, then the adaptability and coverage are improved, but the device complexity increases
Solution Approach 1:
The patent introduces priority parameters associated with each component carrier to guide UE behavior. By changing the parameter structure to include priority levels, the system provides clear decision-making criteria for UE selection algorithms, reducing the complexity of multi-carrier synchronization management.
Solution Approach 2:
The set of component carriers is segmented into different priority groups, with reference carriers having higher priority. This segmentation allows UEs to focus on a subset of carriers for synchronization purposes, reducing the effective complexity while maintaining adaptability across multiple carriers.
3Measurement precision
If UEs select synchronization sources based on RSRP measurements, then the synchronization accuracy is improved, but the time required for synchronization increases
Solution Approach 1:
The network pre-configures priorities for different component carriers before the UE needs to perform synchronization. This preliminary setup provides a hierarchical framework that guides the UE's measurement and selection process, reducing the time needed to evaluate multiple carriers while maintaining accuracy through RSRP measurements on prioritized carriers.
Solution Approach 2:
The UE dynamically adjusts its synchronization source selection based on real-time RSRP measurements while following the pre-established priority framework. This dynamic approach allows the system to achieve accurate synchronization by measuring only the necessary carriers according to their priority levels, rather than exhaustively measuring all possible carriers.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive an indication of a configuration, for synchronization of a communication link, of a plurality of component carriers (CCs) and respective priorities associated with the plurality of CCs and may receive a plurality of synchronization signals (SSs) via the plurality of CCs. The UE may synchronize with a timing source associated with a wireless device associated with a first CC of the plurality of CCs, and may transmit SSs via one or more of the plurality of CCs. The UE may select the first CC and may transmit the SSs via the one or more of the plurality of CCs based on the respective priorities associated with the plurality of CCs, respective received signal powers of the SSs, a synchronization source priority of the wireless device, one or more reference carriers, or any combination thereof.