UE Capability Reporting for Carrier Aggregation Signaling
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Solution Overview
Problem
The existing methods for User Equipment (UE) capability reporting in LTE systems face challenges in efficiently conveying advanced transmission technologies like carrier aggregation, leading to increased traffic overhead due to the complexity and size of capability information.
Innovation Solution
A method and apparatus for efficiently reporting UE capabilities by combining band combination information and unit capabilities with the same measurement gap requirement, reducing signaling overhead through a hierarchical configuration of UE capability information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE capability information includes detailed band combination information for carrier aggregation, then the capability reporting supports advanced transmission technologies, but the traffic overhead increases due to the complexity and size of capability information
Solution Approach 1:
The UE capability information is segmented into multiple parts: a first part containing essential capability information that can be reported separately, and a second part containing detailed band combination information that is reported only when needed. This segmentation allows the system to reduce traffic overhead by not always transmitting the complete capability set, while still maintaining full adaptability when advanced features are required.
Solution Approach 2:
The network side performs preliminary action by determining whether the UE supports carrier aggregation before requesting full capability information. The network can first request and process a simplified capability report, and only if carrier aggregation is needed does it subsequently request the detailed band combination information. This preliminary filtering action reduces unnecessary traffic overhead.
2Loss of information
If UE capability report includes all band combination information, then complete capability information is provided, but signaling overhead increases
Solution Approach 1:
The detailed band combination information is extracted from the complete UE capability report and handled separately. Instead of including all band combination information in every capability report, the system extracts only the essential capability information for the main report, and the detailed band combination information is extracted and reported only when the network determines it is needed for carrier aggregation operations.
Solution Approach 2:
The capability reporting structure is made dynamic rather than static. The UE capability information is configured with a first part that is always reported and a second part containing band combination information that is dynamically reported based on network requirements. This dynamic approach ensures information completeness when needed while minimizing signaling overhead during normal operations.
3Measurement precision
If detailed capability information is reported for each band combination, then accurate UE capability representation is achieved, but message size increases
Solution Approach 1:
The capability information message is segmented into a compact first part with essential parameters and a second part with detailed band combination parameters. This segmentation allows the message size to be optimized by only including detailed information when necessary, while maintaining measurement precision through the structured organization that preserves all necessary capability details when fully reported.
Solution Approach 2:
Different parts of the capability information message have different levels of detail and importance. The first part contains high-priority essential capability information that is always reported, while the second part contains detailed band combination information that is reported selectively. This local quality differentiation ensures that the most critical information is always present while reducing overall message size by omitting less critical details when appropriate.
Data Source
AI summary
A method and an apparatus for reporting a capability of a User Equipment (UE) supporting advanced functions such as Carrier Aggregation (CA) are provided. The method includes checking, when a control message requesting a capability report is received, a Radio Access Technology (RAT) type and transmitting, when the RAT type is set to Evolved Universal Terrestrial Radio Access (EUTRA), at least one band combination information on at least one band combination supported by the terminal. The UE capability report method is capable of reporting the UE capability related to advanced functions, such as CA and Multiple Input Multiple Output (MIMO), to a network efficiently with the least amount of information, thereby resulting in an improvement of radio resource efficiency.