Dynamic Capability Reporting for Serving RAT Prioritization
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Solution Overview
Problem
The existing capability reporting methods for communication devices in LTE and NR networks are insufficient to report all supported band combinations due to Service Data Unit (SDU) limitations, leading to incomplete configuration and poor user experience, especially for services like MRDC and CA.
Innovation Solution
A dynamic capability reporting method that adjusts the distribution of capability information based on the serving and non-serving Radio Access Technologies (RATs), where the serving RAT is given higher weighting to report more band combinations, allowing the network to successfully configure services by prioritizing the serving RAT's capability information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the capability report message uses fixed distribution for all RATs, then the structure is simple, but the serving RAT cannot report all supported band combinations due to SDU size limitations
Solution Approach 1:
The capability report message employs dynamic distribution mechanism where the allocation of capability information across different RATs is adjusted based on the serving RAT. The system dynamically switches between different distribution patterns (first distribution for serving RAT, second distribution for non-serving RAT) to optimize the reporting of band combinations according to current operational context.
Solution Approach 2:
Different quality levels of capability information are assigned to different RATs within the same report message. The serving RAT receives enhanced capability information with more detailed band combination data, while non-serving RATs receive reduced or summarized information, allowing each RAT to have appropriately tailored information depth.
2Loss of information
If the capability report includes all band combinations for all RATs, then the information is complete, but the message size exceeds SDU maximum limits
Solution Approach 1:
The capability report message is segmented into different portions allocated to different RATs. The message structure divides the total capability information into serving RAT section and non-serving RAT section, with the serving RAT section receiving larger allocation for complete band combination data while non-serving sections receive reduced allocations, ensuring the total size remains within SDU limits.
Solution Approach 2:
The system applies partial action by including complete capability information only for the serving RAT while providing partial or summarized information for non-serving RATs. This selective inclusion strategy ensures that critical serving RAT capabilities are fully reported while controlling overall message size to fit within SDU maximums.
3Adaptability or versatility
If equal weighting is applied to all RATs in capability reporting, then the reporting is fair, but the serving RAT cannot prioritize its band combinations
Solution Approach 1:
The capability reporting system introduces asymmetry in weighting different RATs based on their operational status. The serving RAT is assigned higher weight and receives preferential treatment in terms of capability information allocation, while non-serving RATs receive lower weight. This asymmetric approach ensures the serving RAT can report all its band combinations while preventing network configuration failures.
Data Source
AI summary
A capability reporting method and a modem chip performing the same are provided. The capability reporting method includes the following steps. A capability enquiry message is received from a network. A plurality of weightings for a serving Radio Access Technology (RAT) and at least one non-serving RAT are determined. The weighting for the at least one non-serving RAT is downgraded. A plurality of capability information for the serving RAT and the non-serving RAT are composed according to the weightings. The size of the capability information for the at least one non-serving RAT is reduced. The capability information for the serving RAT and the capability information for the at least one non-serving RAT are combined to obtain a capability report message. The capability report message is replied to the network.