NSAG-Based Cell Reselection Across Shared Tracking Areas
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cell reselection processes in wireless communication networks fail to consider network slicing access stratum group (NSAG) priorities across different tracking areas, leading to inefficient radio resource management and cell reselection, particularly when UEs move between tracking areas with different NSAG configurations.
Innovation Solution
Incorporating tracking area identifiers (TAIs) with NSAG identifiers in NAS messages and configuring UEs to prioritize frequencies and cells based on NSAG-TAI pairs, ensuring that only frequencies and cells supporting the desired NSAG-TAI pairs are considered for RRM measurements and cell reselection, thereby optimizing network resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cell reselection processes do not consider NSAG priorities across tracking areas, then the process is simple and does not require complex NSAG-TAI pairing, but cell reselection efficiency deteriorates and UEs may camp on cells not supporting desired network slices
Solution Approach 1:
The patent segments the cell reselection process by introducing NSAG-TAI pairs as distinct identification units. Instead of treating all cells uniformly, the system divides cells into groups based on their NSAG-TAI configurations, allowing UEs to selectively evaluate cells based on their specific slice requirements and current tracking area context.
Solution Approach 2:
The patent applies preliminary action by having the network pre-configure UEs with NSAG priority information and valid TAI lists before cell reselection occurs. This advance configuration enables UEs to perform targeted RRM measurements only on cells that support their required NSAG-TAI combinations, avoiding unnecessary measurements and improving reselection efficiency.
2Measurement precision
If UEs perform RRM measurements on all frequencies without NSAG-TAI filtering, then the measurement process is simple and comprehensive, but unnecessary measurements increase power consumption and reduce measurement precision
Solution Approach 1:
The patent extracts and removes unnecessary measurement targets from the UE's evaluation set. By filtering out cells that do not support the UE's required NSAG-TAI combinations, the system reduces the number of RRM measurements UEs must perform, directly lowering power consumption while maintaining measurement precision for relevant cells.
Solution Approach 2:
The patent changes the measurement selection parameter from a blanket approach (measure all cells) to a conditional approach (measure only cells matching NSAG-TAI criteria). This parameter change enables UEs to dynamically adjust their measurement set based on their slice requirements and current tracking area, optimizing both power consumption and measurement accuracy.
3Reliability
If the system does not validate NSAG-TAI combinations, then the system is simpler and does not require cross-checking between release messages and system information, but service availability deteriorates when UEs move between tracking areas
Solution Approach 1:
The patent implements feedback mechanisms where the network provides UEs with validated NSAG-TAI combination information through release messages and system information broadcasts. UEs use this feedback to verify whether target cells support their required slice groups, ensuring reliable service availability when moving between tracking areas while maintaining manageable system complexity.
4Reliability
If frequencies are prioritized without considering NSAG-TAI pairs, then frequency prioritization is simple and follows traditional methods, but cell reselection reliability deteriorates as UEs may select cells not supporting required network slices
Solution Approach 1:
The patent adds another dimension to frequency prioritization by incorporating TAI information into the traditional frequency priority framework. Instead of prioritizing frequencies alone, the system creates NSAG-TAI-frequency triplets, allowing UEs to prioritize frequencies based on both traditional quality metrics and slice-specific requirements across different tracking areas, thereby improving reselection reliability.
Data Source
AI summary
Systems, methods, and circuitries are provided for performing network slice-based prioritization. In one example a UE is configured to receive a non-access stratum (NAS) message configuring one or more network slicing access stratum groups (NSAGs) and providing NSAG priority information. The UE receives a release message that indicates first NSAG/frequency priority information for a first set of one or more NSAG/frequency pairs. The UE receives system information that indicates second NSAG/frequency priority information for a second set of one or more NSAG/frequency pairs. The UE prioritizes frequencies that are included in at least one NSAG/frequency pair belonging to both the first set and the second set while not considering frequencies that are not included an NSAG-frequency pair belonging to both the first set and the second set. The UE performs radio resource management measurements or cell reselection based on the prioritized frequencies.