Mobile Station Carrier Aggregation Measurement Gap Control
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Solution Overview
Problem
When carrier aggregation is applied in LTE-advanced systems, the mobile station experiences data transmission and reception issues due to frequency changes between primary and secondary component carriers, leading to potential data loss and throughput deterioration, especially during measurement gaps.
Innovation Solution
A communication control method that manages measurement gaps differently for activated and deactivated secondary component carriers, allowing data transmission on the primary carrier during activated states and suspending it during deactivated states to avoid data loss and maintain throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station performs cell search, measurement, or radio link monitoring on a secondary component carrier, then the mobile station can maintain connection stability and system efficiency, but power consumption increases in proportion to the number of component carriers
Solution Approach 1:
The patent applies dynamic activation and deactivation control for secondary component carriers based on communication conditions. When data transmission is active, the secondary carrier is activated to maintain connection stability; when data transmission is suspended, the secondary carrier is deactivated to reduce power consumption. This dynamic state transition resolves the contradiction between maintaining reliability and reducing energy usage.
2Measurement precision
If the mobile station performs measurement on a carrier with a different frequency using a measurement gap, then the mobile station can perform cell search and measurement operations, but communication with the serving cell is stopped and throughput deteriorates
Solution Approach 1:
The patent performs measurement operations on secondary component carriers during periods when data transmission is already suspended, rather than creating separate measurement gaps. By utilizing existing suspension periods for measurement purposes, the system avoids additional throughput deterioration while maintaining measurement precision.
3Adaptability or versatility
If the mobile station changes frequency between primary and secondary component carriers, then the mobile station can perform data transmission on appropriate carriers, but data loss occurs and throughput deteriorates during frequency transitions
Solution Approach 1:
The patent ensures continuous data transmission by activating the secondary component carrier before frequency transitions are needed and maintaining it active during the transition period. This prevents data loss during carrier switching by ensuring the target carrier is already ready and active, maintaining both adaptability and reliability.
Data Source
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AI summary
A mobile station UE of the present invention is a mobile station that communicates with a radio base station using equal to or greater than two carriers, wherein the equal to or greater than two carriers include a first carrier and a second carrier, the mobile station including: a first communicating unit configured to perform communication with the first carrier; and a second carrier measuring unit configured to perform measurement of the second carrier, wherein, in a case where a measurement gap for measuring the second carrier is set, the first communicating unit is configured to perform communication with the first carrier without considering the measurement gap when the second carrier is activated, and not to perform communication with the first carrier in the measurement gap when the second carrier is not activated.