Uplink Carrier Selection via Path-Loss in Carrier Aggregation
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Solution Overview
Problem
The existing uplink contention-based data transmission methods are not optimized for mobile station apparatuses using multiple frequency bands in carrier aggregation, leading to uncertainty in selecting the optimal uplink transmission method, particularly when radio resources for uplink transmission data have not been allocated.
Innovation Solution
A mobile station apparatus selects an uplink frequency band for radio resource requests using a physical random access channel based on reception quality and allocates transmission settings for multiple frequency bands, allowing for either random access channel or contention-based data transmission, optimizing the uplink transmission method based on conditions such as path-loss and data volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a mobile station apparatus uses multiple frequency bands in carrier aggregation, then data rate is improved, but uncertainty in selecting the optimal uplink transmission method increases
Solution Approach 1:
The patent changes the parameter of transmission method selection by introducing conditional logic based on path-loss values and resource allocation status. The mobile station apparatus compares path-loss values across component carriers and selects the transmission method (random access or contention-based) based on predefined conditions, thereby resolving the uncertainty in method selection while maintaining multiple frequency band usage
Solution Approach 2:
The patent implements dynamic selection of uplink transmission methods based on real-time conditions such as path-loss values and resource allocation status. The system adapts its transmission approach by evaluating current channel conditions and selecting the most appropriate method, transforming a static uncertain process into a dynamic optimized one
2Loss of time
If a mobile station apparatus uses physical random access channel for radio resource requests, then transmission delay is reduced, but transmission power increases
Solution Approach 1:
The patent changes the parameter of transmission method selection by introducing conditional logic based on path-loss values and resource allocation status. The mobile station apparatus compares path-loss values across component carriers and selects the transmission method (random access or contention-based) based on predefined conditions, thereby resolving the uncertainty in method selection while maintaining multiple frequency band usage
3Reliability
If a mobile station apparatus selects uplink frequency band based on reception quality, then success probability of radio resource requests is improved, but control complexity increases
Solution Approach 1:
The patent changes the parameter of transmission method selection by introducing conditional logic based on path-loss values and resource allocation status. The mobile station apparatus compares path-loss values across component carriers and selects the transmission method (random access or contention-based) based on predefined conditions, thereby resolving the uncertainty in method selection while maintaining multiple frequency band usage
Data Source
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AI summary
When a mobile station apparatus capable of being connected to a base station apparatus by using a plurality of frequency bands performs an uplink transmission, the mobile station apparatus selects the optimum combination among the combinations of a plurality of frequency bands and uplink transmission methods, and performs the uplink transmission. The mobile station apparatus aggregates a plurality of cells to connect the same to a base station apparatus and requests, from the base station apparatus, an uplink radio resource required to transmit uplink data. The mobile station apparatus selects, based on a first condition, an uplink for making a radio resource request using a random access channel from the plurality of cells, and selects, based on a second condition, either the radio resource request using the random access channel or the transmission of uplink data using an uplink radio resource common to other mobile station apparatuses.