Carrier Aggregation Measurement Switching After SCC Activation
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Solution Overview
Problem
The measurement capability of measurement-free window measurement is affected after a secondary component carrier (SCC) is activated in carrier aggregation (CA) systems, leading to performance issues and potential SCC rollback.
Innovation Solution
A method involving a network device configuring a secondary component carrier (SCC) with additional measurement window information to enable seamless switching from measurement window-free to measurement window-based operations, using first and second information to activate the SCC and measurement window, respectively, ensuring timely adjustments based on timer settings and dormancy/non-dormancy behaviors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device performs cell measurement in measurement window-free manner after SCC activation, then the measurement capability is affected and cannot measure neighboring cell, but if measurement window is configured, then the terminal device can measure neighboring cell however it requires additional configuration complexity
Solution Approach 1:
The network device pre-configures measurement window parameters (measurement gap repetition period, measurement gap length, measurement offset) in advance through RRC signaling, so that when SCC activation is needed, the terminal device can immediately switch to measurement window-based operation without requiring additional real-time configuration, thus resolving the contradiction between measurement capability and configuration complexity
Solution Approach 2:
The system dynamically switches between measurement window-free and measurement window-based operations based on SCC activation state. The terminal device determines whether to use measurement window or measurement window-free manner according to whether SCC is activated, making the measurement mechanism adaptive to different operational states rather than fixed
2Reliability
If the terminal device switches from measurement window-free to measurement window-based measurement after SCC activation, then measurement capability is maintained but data transmission may be interrupted due to measurement window
Solution Approach 1:
The measurement window is configured with specific local parameters (measurement gap repetition period, measurement gap length, measurement offset) that are optimized for the particular operational state. By locally adjusting these measurement window characteristics rather than using fixed measurement windows, the system can maintain measurement capability while minimizing impact on data transmission
Solution Approach 2:
The measurement window operates periodically with a configured measurement gap repetition period, allowing data transmission to occur during non-measurement periods while maintaining regular measurement cycles. This periodic structure ensures both measurement capability and continuous data transmission can coexist
Data Source
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AI summary
A measurement configuration method and an apparatus are provided. The method includes: A network device sends first information to a terminal device. The first information includes configuration information of an SCC. The network device sends second information to the terminal device. The second information includes configuration information of a first measurement window, and the second information is used to enable the terminal device to switch, when supporting CA, from performing cell measurement in a measurement window-free measurement manner to performing cell measurement by using the first measurement window. A carrier included in the CA includes the SCC configured based on the first information. According to the foregoing method, after the network device configures the SCC, the terminal device may switch, based on the second information, from performing cell measurement in the measurement window-free measurement manner to performing cell measurement by using the first measurement window. This can resolve a problem that a measurement capability of measurement-free window measurement is affected after the SCC is activated.