NR PSCell Selection Using Priority Band Measurement Reporting
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Solution Overview
Problem
The 3GPP standards lack specific reporting priorities for 5G user equipment, leading to unspecified order of measurement reports for NR frequency bands, which results in increased latency during the selection of a primary secondary cell (PSCell) due to added wait times in new radio communication systems.
Innovation Solution
Introduce a priority ranking system for NR frequency bands, allowing user equipment (UE) or network to prioritize measurement reporting, considering criteria such as bandwidth, radio conditions, and device conditions like battery state or thermal issues, to facilitate efficient selection of high-capacity cells without additional latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wait period/timer is implemented to add highest order frequency band as NSA primary cell, then frequency band selection is standardized, but latency increases
Solution Approach 1:
The patent applies preliminary action by having the UE prioritize and prepare measurement reports for higher priority NR frequency bands before the network makes its final selection decision. The UE proactively orders measurement reports based on priority criteria (such as bandwidth, radio conditions, device state) so that when the network receives them, the highest priority bands are already ready for immediate selection, eliminating the need for additional wait time while ensuring standardized selection.
2Device complexity
If measurement reports are received in unspecified order, then implementation complexity is reduced, but optimal frequency band selection is compromised
Solution Approach 1:
The patent applies local quality by assigning different priorities to different NR frequency bands based on their specific characteristics (bandwidth, radio conditions, device state). Instead of treating all frequency bands uniformly, the system applies localized priority rules to each band, allowing the network to receive and process measurement reports in a structured manner that ensures optimal selection while maintaining manageable implementation complexity through standardized priority criteria.
3Speed
If higher priority frequency bands are selected without priority reporting, then selection speed is maintained, but network performance is suboptimal
Solution Approach 1:
The patent applies feedback by having the UE include priority information in the measurement reports sent to the network. This feedback mechanism allows the network to receive not just raw measurement data but also prioritized information about which frequency bands are most suitable based on current conditions. The network can then use this feedback to make faster, more informed selection decisions that optimize network performance without sacrificing selection speed.
Data Source
AI summary
The disclosed technology is directed towards prioritizing selection of a new radio primary secondary cell (PSCell) for use by user equipment in non-standalone scenarios. User equipment (a mobile device) obtains measurement reports for available new radio frequency bands. The mobile device can prioritize the reporting of the measurement data so as to indicate to the network which candidate PSCell that the user equipment prefers to have selected. The network can bias selection of one candidate PSCell over others by providing different time-to-trigger periods for different available frequency bands. A mobile device can prioritize PSCell selection based on current conditions, such as based on application program needs, so as to use a PSCell with bandwidth that is appropriate for a current application program in use. The mobile device and network can collaborate to select a PSCell based on other conditions such as remaining battery capacity of the device and/or thermal conditions.