Carrier Aggregation Coordination for Cross-Base Station Parameter Updates
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Solution Overview
Problem
In inter-base station carrier aggregation, data transmission failures occur when a radio terminal changes radio parameters in cells served by different radio stations, as the secondary cell station may continue data transmission unaware of the parameter change by the primary cell station.
Innovation Solution
A first radio station communicates update information to a second radio station about configuration changes in a secondary cell, enabling the second station to suspend data transmission during parameter updates, ensuring synchronized parameter changes across multiple cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a radio terminal changes radio parameters in a secondary cell served by a different radio station, then the parameter configuration is updated, but data transmission failures occur because the secondary cell station continues transmission unaware of the change
Solution Approach 1:
The primary cell station sends update information to the secondary cell station before the radio terminal completes parameter configuration. This preliminary notification allows the secondary cell station to prepare for parameter changes and suspend data transmission appropriately, preventing transmission failures while maintaining configuration flexibility.
Solution Approach 2:
The system implements a feedback mechanism where the primary cell station monitors parameter configuration status and sends update information to the secondary cell station. This feedback loop ensures the secondary cell station is aware of configuration changes and can adjust its data transmission accordingly, resolving the reliability issue while preserving adaptability.
2Reliability
If the primary cell station sends update information to the secondary cell station, then data transmission reliability is improved, but communication control complexity increases
Solution Approach 1:
The primary cell station performs multiple functions: it manages parameter configuration for the radio terminal and simultaneously acts as a coordinator for the secondary cell station. This multi-functionality consolidates control responsibilities, improving reliability through centralized coordination while minimizing the increase in overall system complexity.
Data Source
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AI summary
A radio terminal (3) can perform carrier aggregation using a first cell (10) of a first radio station (1) and a second cell (20) of a second radio station (2). The first radio station (1) performs, with the radio terminal (3), radio resource control for the first cell (10) and the second cell (20) in order to perform the carrier aggregation. Further, the first radio station (1) transmits, to the second radio station (2), update information regarding an update to a configuration related to the radio resource control for the second cell (20). It is thus, for example, possible to prevent or reduce data transmission/reception failures which would otherwise occur while a configuration of radio parameters or the like is being changed by a radio terminal in carrier aggregation of a plurality of cells served by different radio stations.