Mobile Station Uplink Timing Capability Notification for Carrier Aggregation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current mobile station apparatus capability notification methods fail to effectively inform base stations about supported uplink transmission timings, leading to incorrect configuration of uplink transmission timings for frequencies that do not support multiple timing combinations.
Innovation Solution
The mobile station apparatus transmits capability information indicating supported uplink transmission timings for each combination of frequencies to the base station, allowing the base station to determine suitable aggregation and configure appropriate random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the mobile station apparatus transmits detailed capability information for each frequency combination, then the base station can accurately determine supported uplink transmission timings, but the signaling overhead and complexity increase
Solution Approach 1:
The capability information is segmented by frequency combination types. The mobile station apparatus divides its supported frequency combinations into different types (e.g., intra-band contiguous, inter-band non-contiguous) and transmits capability information specific to each type. This segmentation allows the base station to accurately determine supported uplink transmission timings for each frequency combination type without requiring detailed information for every possible combination, thus reducing signaling overhead while maintaining accuracy.
Solution Approach 2:
Instead of transmitting complete capability information for all possible frequency combinations, the mobile station apparatus transmits capability information only for representative frequency combination types. This partial action approach provides sufficient information for the base station to make accurate configuration decisions without the excessive signaling overhead of complete information transmission for every possible scenario.
2Productivity
If the base station configures multiple uplink transmission timings without verifying mobile station support, then carrier aggregation can be established, but transmission errors occur for frequencies that do not support multiple timing combinations
Solution Approach 1:
The mobile station apparatus performs preliminary action by transmitting its capability information regarding supported uplink transmission timings for different frequency combinations before the base station configures carrier aggregation. This allows the base station to verify which frequency combinations are actually supported by the mobile station and configure uplink transmission timings accordingly, preventing transmission errors while maintaining configuration efficiency.
Solution Approach 2:
The capability information transmission from mobile station to base station serves as feedback about the mobile station's actual capabilities. The base station uses this feedback to make informed configuration decisions, configuring uplink transmission timings only for frequency combinations that the mobile station has indicated it supports, thereby ensuring reliable transmission.
3Device complexity
If general capability information is transmitted without frequency combination specifics, then signaling overhead is reduced, but the base station cannot determine which frequency bands support multiple uplink transmission timings
Solution Approach 1:
The capability information is customized according to local quality requirements of different frequency combination types. Instead of using a uniform notification method for all frequencies, the mobile station apparatus provides specific capability information for each frequency combination type (e.g., intra-band contiguous, inter-band non-contiguous). This allows the base station to determine which specific frequency bands support multiple uplink transmission timings while keeping the notification structure organized and manageable.
Data Source
AI summary
An object of the invention is to provide a mobile station apparatus, a base station apparatus, a communication system, a mobile station apparatus capability notification method, and an integrated circuit, which enable uplink transmission timing support information of the mobile station apparatus to be effectively notified to the base station apparatus. The mobile station apparatus that is connected to the base station apparatus by aggregating a plurality of cells of which frequencies are different from each other transmits capability information in which information related to an uplink transmission timing supported by the mobile station apparatus is associated with the plurality of frequencies supported by the mobile station apparatus, to the base station apparatus.