Uplink Carrier Aggregation Cell Selection via Bandwidth Thresholding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless telecommunications networks face challenges in supporting uplink (UL) New Radio Carrier Aggregation (NRCA) frequency combinations, which are not adequately managed for primary and secondary cell selection in user equipment (UE), limiting high uplink speeds and accommodating multiple operators' spectrum holdings.
Innovation Solution
A method for UL NRCA aware primary and secondary cell selection is implemented, where a base station receives uplink messages from UE, determines if the current serving primary cell's frequency is supported, compares bandwidth with candidate cells, and hands over the UE if the difference is below a predetermined threshold, ensuring optimal frequency combinations for carrier aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UL NRCA frequency combinations are introduced to provide high uplink speeds, then uplink throughput is improved, but device compatibility and cell selection complexity worsen
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting cell selection criteria based on UL NRCA frequency combination parameters. The base station evaluates UE capabilities and modifies cell selection parameters to accommodate UL NRCA requirements, enabling high uplink throughput while managing device compatibility through parameter-based adaptation rather than hardware changes
Solution Approach 2:
The patent implements preliminary action by pre-configuring UL NRCA frequency combinations and cell selection criteria at the base station before UE connection. The base station prepares candidate cell lists with UL NRCA awareness in advance, so when UE needs handover or cell selection, the process is accelerated and complexity is reduced through pre-computed configurations
2Speed
If base station evaluates UL NRCA frequency combinations for cell selection, then uplink performance is improved, but signaling overhead and processing time increase
Solution Approach 1:
The base station performs preliminary evaluation of UL NRCA frequency combinations during initial cell configuration and maintains updated candidate cell lists. This pre-computation allows rapid cell selection and handover decisions without real-time evaluation delays, reducing signaling overhead while maintaining uplink performance
Solution Approach 2:
The patent implements feedback mechanisms where the base station receives UL capability information from UE and uses this feedback to refine cell selection decisions. The feedback loop allows the system to adapt cell selection criteria based on actual UE capabilities and network conditions, optimizing uplink speed while minimizing unnecessary processing
3Measurement precision
If bandwidth comparison with threshold is used for primary cell selection, then cell selection accuracy is improved, but the risk of frequent handovers increases
Solution Approach 1:
The patent applies beforehand cushioning by establishing a bandwidth threshold that provides a safety margin against marginal cases. The threshold is set to ensure that only cells with significantly better bandwidth characteristics trigger handover, cushioning against unnecessary handovers due to minor fluctuations while maintaining accuracy for clearly superior cells
Solution Approach 2:
The system dynamically adjusts cell selection based on real-time bandwidth measurements and threshold comparisons. The handover decision mechanism is dynamic, continuously evaluating current cell bandwidth against candidate cells and the threshold, allowing the system to adapt to changing network conditions while maintaining stability through the threshold buffer
Data Source
AI summary
Dynamic carrier aggregation cell relationship management systems and methods are provided. The method begins when a base station receives at least one first uplink message from a UE that includes at least one UL and DL carrier aggregation frequency set that the UE supports. The base station then determines if the current serving primary cell frequency used by the UE is included in the base station's set of UL NRCA frequency combinations. If the current serving primary cell frequency used by the UE is not included in the set of UL NRCA frequency combinations the base station compares the bandwidth of the current serving primary cell with a bandwidth of the candidate primary cell. If the different in bandwidth is less than a predetermined operator defined threshold, the UE is instructed to handover from the current serving primary cell to the candidate primary cell.