Carrier Aggregation Random Access Acknowledgement Reception
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in performing random access procedures and transmitting/receiving control information in carrier aggregation-based systems, particularly in handling acknowledgement information during uplink signal transmissions.
Innovation Solution
A method and apparatus for a user equipment (UE) in a carrier aggregation-based wireless communication system, where uplink resource allocation information is received through a first cell, and an uplink signal is transmitted on a second cell using this information, with acknowledgement information being received via a specific cell different from the first cell during random access procedures, and via the first cell during non-random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If acknowledgement information is always received via the first cell (PCell), then control information transmission is simplified, but random access procedure efficiency deteriorates due to suboptimal resource utilization
Solution Approach 1:
The patent applies dynamics by making the acknowledgement information reception cell dynamic rather than fixed. The UE determines whether to receive acknowledgement information via the first cell or second cell based on the random access indicator value, allowing the system to adaptively switch between reception paths to optimize for different operational scenarios (random access vs. non-random access procedures).
Solution Approach 2:
The patent applies local quality by assigning different reception characteristics to different types of uplink transmissions. Random access procedure acknowledgements are received via the second cell (SCell) to leverage its resources, while non-random access acknowledgements are received via the first cell (PCell) for reliability. This localized optimization resolves the contradiction by tailoring the reception path to the specific procedure type.
2Productivity
If acknowledgement information for random access is received via the second cell (SCell), then random access procedure efficiency is improved, but control information transmission complexity increases
Solution Approach 1:
The patent reduces complexity through dynamic cell selection based on the random access indicator. Rather than maintaining complex logic to determine which cell to use for each acknowledgement type, the system uses the indicator to directly select the appropriate reception cell, simplifying the overall control flow while maintaining optimization for random access procedures.
3Productivity
If different cells are used for different procedures, then resource utilization is optimized, but system complexity increases
Solution Approach 1:
The patent applies local quality by optimizing resource utilization for specific procedure types without requiring complex system-wide changes. The UE uses the random access indicator to locally determine the appropriate acknowledgement reception cell based on whether the current transmission is part of a random access procedure, achieving localized resource optimization with minimal added complexity.
Data Source
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AI summary
The present invention relates to a wireless communication system. In detail, the present invention is a method in which user equipment for which a plurality of cells is constituted receives control information in a carrier aggregation-based wireless communication system, and an apparatus for the method. The method comprises: a step of receiving, through a first cell, uplink resource allocation information for a second cell; a step of transmitting an uplink signal on the second cell using the uplink resource allocation information; and a step of receiving response information to the uplink signal. The response information is received via a specific cell rather than the first cell when the uplink signal is transmitted by a random access process, and the response information is received via the first cell when the uplink signal is transmitted by a non-random access process.