Carrier Aggregation Access Selection in LTE
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Solution Overview
Problem
Current techniques for access network selection and traffic steering in LTE networks with carrier aggregation are inadequate, as they do not effectively consider information from multiple aggregated carriers, leading to ambiguous decisions and potential degradation of system performance and user experience.
Innovation Solution
A method and apparatus for a mobile device and network node to obtain and process information from multiple aggregated carriers in a 3GPP network to determine appropriate actions for access network selection and traffic steering between 3GPP and WLAN or non-3GPP networks, using techniques such as measuring signal quality parameters and combining threshold values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current techniques for access network selection are used in LTE networks with carrier aggregation, then the decision process is simple, but the system performance degrades due to ambiguous decisions from not considering multiple carriers
Solution Approach 1:
The patent segments the information from multiple carriers by identifying a specific carrier (e.g., primary carrier or carrier with best signal quality) and using only that carrier's information for access network selection decisions. This segmentation approach resolves the contradiction by selecting one carrier's information out of multiple carriers, thereby improving decision reliability while avoiding the complexity of processing all carrier information simultaneously.
2Reliability
If information from multiple aggregated carriers is processed for access network selection, then the reliability of network selection improves, but the device complexity increases
Solution Approach 1:
The patent extracts information from a specific carrier (such as the primary carrier or the carrier with the best signal quality) out of multiple aggregated carriers and uses only that extracted information for access network selection. This extraction principle improves reliability by focusing on the most relevant carrier information while reducing processing complexity by excluding information from other carriers.
3Quantity of substance
If carrier aggregation is implemented to increase bandwidth, then the data capacity improves, but the access network selection becomes ambiguous due to multiple carriers
Solution Approach 1:
The patent applies local quality by assigning different roles to different carriers: one carrier (e.g., primary carrier) provides information for access network selection decisions, while other carriers contribute to bandwidth capacity. This local differentiation resolves the contradiction by ensuring that the carrier used for selection decisions has the appropriate quality characteristics (clear, unambiguous information) while other carriers provide quantity (bandwidth) without interfering with decision clarity.
Data Source
AI summary
According to one aspect, there is provided a method of operating a mobile device that is configured for use in a first radio access network that uses a first radio access technology and a second radio access network that uses a second, different, radio access technology, the mobile device aggregating a plurality of carriers in the first radio access network, the method comprising obtaining information for, or pertaining to, one or more of the plurality of carriers in the first radio access network; and processing the obtained information for a single carrier to determine an action for the mobile device to take with respect to the second radio access network.