UE Frequency Scan Ordering Using Conditional Handover Cell Data
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Solution Overview
Problem
Existing wireless communications systems face challenges in maintaining accurate and efficient cell frequency scans, particularly in complex and dynamic environments, where system information blocks (SIBs) may not provide the latest information on neighboring cells, leading to unsuccessful handovers and increased power consumption.
Innovation Solution
The proposed method optimizes cell frequency scans by using information from conditional handover (CHO) candidate cells, which are based on UE measurements, to determine the order of acquisition database scans, making this frequency/cell information persistent for subsequent scans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system information blocks (SIBs) are used to obtain neighboring cell information for frequency scans, then the scan process can be initiated, but the information may not be up-to-date in dynamic environments, leading to unsuccessful handovers
Solution Approach 1:
The patent applies preliminary action by performing frequency scans on candidate cells identified through conditional handover (CHO) measurements before actual handover is needed. The UE maintains an acquisition database with frequency information from CHO candidate cells, which is more current than SIB information. When out-of-service or radio link failure occurs, the UE can immediately perform scans on these pre-identified candidate frequencies, ensuring up-to-date information and提高 handover success rate.
2Reliability
If full band scans are performed to ensure comprehensive frequency coverage, then all possible cells can be detected, but power consumption increases and scan time is extended
Solution Approach 1:
The patent applies segmentation by dividing the frequency scan process into two parts: (1) a targeted scan on candidate cell frequencies from the acquisition database (which are more likely to succeed), and (2) a full band scan as fallback. The UE first performs scans on the segmented candidate frequencies, which consumes less power and time. Only if these scans fail does the UE proceed to the full band scan, thus reducing overall power consumption while maintaining detection completeness.
Solution Approach 2:
The patent applies local quality by focusing scan resources on specific candidate frequencies identified through CHO measurements rather than uniformly scanning all frequencies. The acquisition database stores frequency information for candidate cells that are locally relevant to the UE's current location and conditions. This localized approach to frequency scanning improves efficiency by concentrating power and time resources on the most promising candidates.
3Productivity
If acquisition database based scans are performed without using CHO candidate cell information, then the scan order is arbitrary, but using CHO information requires maintaining and processing additional cell data
Solution Approach 1:
The patent applies universality by making the acquisition database serve multiple functions: it stores frequency information for CHO candidate cells, provides the basis for determining scan order, and acts as a cache for previously scanned frequencies. This multi-functional use of the acquisition database eliminates the need for separate data structures, reducing overall system complexity while enabling efficient scan ordering based on CHO candidate information.
Data Source
AI summary
Certain aspects of the present disclosure provide a method for wireless communications by a user equipment (UE), generally including receiving, from a network entity, information regarding candidate cells configured for conditional handover (CHO), determining, based on the information regarding the candidate cells, an order to scan frequencies for an acquisition database based scan, and performing the acquisition database based scan in the determined order.