Terminal Feedback Mapping Across Discontinuous Virtual CCs
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Solution Overview
Problem
In wireless communication systems, there is a lack of a defined feedback operation for retransmission control in widebands that are discontinuous in the frequency domain, particularly in carrier aggregation scenarios.
Innovation Solution
A terminal equipped with a receiving unit to process a downlink shared channel in a virtual CC, a control unit to determine feedback information, and a transmitting unit to send uplink control channels, allowing for the determination of which actual CCs transmit the feedback and the interval between downlink and uplink channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is used to secure wideband data resources, then data transmission capacity is improved, but feedback operation for retransmission control cannot be executed in discontinuous frequency domains
Solution Approach 1:
The patent segments the wideband frequency domain into multiple component carriers (CCs) that are discontinuous in frequency. Each CC can be independently scheduled and acknowledged, allowing feedback operations to be performed on a per-CC basis rather than requiring a continuous wideband structure. This segmentation enables carrier aggregation to maintain high data transmission capacity while providing reliable feedback mechanisms for each individual carrier.
2Adaptability or versatility
If resource allocation is performed for respective carriers in carrier aggregation, then resource allocation flexibility is improved, but feedback operation related to retransmission control is not stipulated
Solution Approach 1:
The patent introduces an intermediary mapping relationship between downlink component carriers and uplink component carriers. This mapping serves as a mediator that connects the flexible downlink resource allocation with the uplink feedback transmission. The intermediary mechanism allows the system to maintain flexible resource allocation across multiple carriers while providing a structured method for feedback operations, thereby reducing the complexity that would otherwise arise from managing feedback across discontinuous frequency domains.
Data Source
AI summary
A terminal includes a receiving unit configured to receive, from a base station, a downlink shared channel in a virtual CC (component carrier) that is discontinuous in a frequency domain and that includes a plurality of actual CCs, a control unit configured to determine feedback information related to retransmission control corresponding to the downlink shared channel, and a transmitting unit configured to transmit, to the base station, an uplink control channel including the feedback information in the virtual CC, wherein the control unit determines which actual CC included in the virtual CC transmits the uplink control channel, and determines an interval between the downlink shared channel and the uplink control channel.