V2X Synchronization Reference Selection via Subframe Dropping
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Solution Overview
Problem
Legacy LTE V2X systems face challenges in asynchronous synchronization reference source selection and reselection due to the inability to simultaneously receive multiple asynchronous signals, leading to potential service interruptions, especially when UEs lack support for simultaneous reception of two or more asynchronous signals.
Innovation Solution
The proposed solution involves a user equipment (UE) establishing a sidelink connection with a first synchronization reference UE and monitoring for physical sidelink broadcast channel (PSBCH) synchronization signals from a second UE, allowing the UE to drop subframes of data reception to perform selection or reselection, thereby enabling identification of newly detectable intra-frequency synchronization reference UEs within specified timeframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a UE simultaneously receives multiple asynchronous synchronization signals, then synchronization accuracy is improved, but device complexity increases due to inability of legacy UEs to support simultaneous reception
Solution Approach 1:
The UE performs preliminary identification of PSBCH monitoring occasions and determines timing relationships before actual synchronization signal reception. This allows the UE to prepare reception timing in advance, avoiding the need for complex simultaneous reception mechanisms while maintaining synchronization accuracy.
Solution Approach 2:
The synchronization signal reception process is segmented into distinct phases: identifying PSBCH monitoring occasions, determining timing relationships, and receiving synchronization signals at specific time offsets. This segmentation allows the UE to handle asynchronous signals sequentially rather than simultaneously, reducing device complexity.
2Adaptability or versatility
If a UE drops subframes to monitor for PSBCH synchronization signals, then synchronization reference reselection capability is improved, but data reception reliability deteriorates
Solution Approach 1:
The UE identifies PSBCH monitoring occasions and determines timing relationships in advance before dropping subframes for synchronization signal reception. This preliminary identification allows the system to schedule data transmissions around these monitoring occasions, reducing impact on data reception reliability.
Solution Approach 2:
The UE monitors for PSBCH synchronization signals at periodic intervals defined by the time offset and monitoring occasion structure. This periodic monitoring approach ensures that synchronization reselection capability is maintained without requiring continuous subframe dropping, thereby preserving data reception reliability during non-monitoring periods.
3Difficulty of detecting and measuring
If a UE monitors for PSBCH synchronization signals from second SyncRef UE, then synchronization reference detection capability is improved, but time consumption increases due to subframe dropping
Solution Approach 1:
The UE performs preliminary identification of PSBCH monitoring occasions and determines timing relationships before actual synchronization signal reception. This advance preparation enables the UE to efficiently monitor for synchronization signals without unnecessary time consumption, as the monitoring occasions are pre-determined based on the time offset parameter.
Data Source
AI summary
Apparatuses, systems and methods associated with asynchronous synchronization reference source selection and reselection for wireless communication devices are disclosed herein. In embodiments, one or more non-transitory, computer-readable media having instructions stored thereon, wherein the instructions, in response to execution by a user equipment (UE), cause the UE to establish a sidelink connection with a first synchronization reference (SyncRef) UE, and monitor for physical sidelink broadcast channel (PSBCH) synchronization signals from a second SyncRefUE, wherein the UE is to drop one or more subframes of data reception of the sidelink connection with the first SyncRef UE when the UE monitors for the PSBCH synchronization signals. Other embodiments may be described and/or claimed.