Mobile Terminal PUCCH Feedback Transmission
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Solution Overview
Problem
In LTE-A systems, the increased amount of feedback control information due to multiple downlink component carriers leads to inefficiencies in transmitting feedback control information through uplink channels, necessitating a more efficient method for transmitting ACK/NACK control bits.
Innovation Solution
A mobile terminal apparatus that uses cyclic shifts and orthogonal codes to efficiently transmit feedback control information by adding cyclic shifts to reference signal blocks and multiplying them with orthogonal codes in the physical uplink control channel format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple downlink component carriers are used to increase transmission rate, then the peak data rate is improved, but the amount of feedback control information increases proportionally
Solution Approach 1:
The feedback control information for multiple component carriers is segmented into separate ACK/NACK bits, each corresponding to a specific carrier. These segmented bits are then efficiently packed and transmitted using compact PUCCH formats, reducing the overall resource consumption while maintaining the ability to convey feedback for all carriers.
Solution Approach 2:
Multiple ACK/NACK bits corresponding to different component carriers are merged into a single uplink transmission. The patent combines these feedback bits using techniques such as bundling or multiplexing, allowing the mobile terminal to transmit feedback for multiple carriers simultaneously through a unified PUCCH resource, thereby improving transmission efficiency.
2Measurement precision
If the amount of feedback control information increases, then the transmission accuracy may be improved, but the uplink channel efficiency deteriorates
Solution Approach 1:
The patent changes the parameters of the PUCCH format to accommodate increased feedback information. This includes using extended PUCCH formats with more resource elements allocated for control information, adjusting the modulation scheme to handle higher data rates, and optimizing the resource allocation to maintain transmission accuracy while improving uplink channel efficiency.
3Adaptability or versatility
If conventional PUCCH formats are used for transmitting increased feedback information, then the system maintains backward compatibility, but the transmission efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic PUCCH format selection that adapts to the amount of feedback information required. When multiple component carriers are configured, the system dynamically switches to extended PUCCH formats optimized for higher feedback loads. This dynamic adaptation maintains backward compatibility with legacy single-carrier configurations while achieving high transmission efficiency in multi-carrier scenarios.
Data Source
AI summary
A mobile terminal apparatus and a radio communication method are provided which can efficiently transmit feedback control information through a physical uplink control channel. The radio communication method according to the present invention uses a plurality of ACK/NACK control bits as data signals, adds cyclic shifts to a plurality of reference signal blocks of a plurality of time blocks in a physical uplink control channel format comprised of a plurality of time blocks, multiplies the plurality of reference signal blocks by orthogonal codes and transmits a control channel signal including reference signals by which orthogonal codes are multiplied to a radio base station apparatus through a physical uplink control channel.