Uplink Control Channel Processing for LTE-A Feedback
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Solution Overview
Problem
In the LTE-A system, the increased number of feedback control information bits due to wider frequency band allocation and multiple component carriers complicates efficient transmission of retransmission acknowledgement signals on uplink control channels, particularly when backward compatibility with LTE is required.
Innovation Solution
A mobile terminal apparatus with a demodulation section for downlink shared channel signals and an uplink control channel processing section that maps retransmission acknowledgement signals from multiple fundamental frequency blocks to a specific uplink control channel using phase shift modulation and channel selection information, allowing efficient transmission of feedback control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple component carriers are used to widen frequency band, then frequency usage efficiency and peak throughput are improved, but the amount of feedback control information increases
Solution Approach 1:
The patent combines multiple ACK/NACK bits from different component carriers into a single uplink control channel transmission. Instead of transmitting separate feedback for each carrier, the invention merges them and uses channel selection to convey the combined acknowledgment status, reducing the total feedback overhead while maintaining support for multiple carriers.
Solution Approach 2:
The uplink control channel is designed to serve multiple functions simultaneously: it transmits both channel quality information and combined acknowledgment signals for multiple component carriers. This multi-functionality allows the system to handle increased feedback requirements without proportionally increasing resource allocation.
2Productivity
If multiple component carriers are allocated, then frequency usage efficiency is improved, but device complexity increases
Solution Approach 1:
The patent changes the parameter representation of acknowledgment signals by mapping multiple ACK/NACK states to a reduced set of channel selections. Instead of transmitting each acknowledgment bit separately, the system transforms the multiple-bit feedback into a fewer-number-of-states representation through channel selection, simplifying the processing complexity.
3Productivity
If channel selection is used for feedback transmission, then transmission efficiency is improved, but information representation complexity increases
Solution Approach 1:
The patent segments the feedback information into distinct parts: channel selection information for indicating acknowledgment status and additional bit information for conveying supplementary data. This segmentation allows the system to use simple channel selection for the primary feedback while attaching additional bits for extra information, balancing transmission efficiency with information completeness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables efficient transmission of feedback control information by defining additional information through channel selection and bit information, supporting multiple states of retransmission acknowledgement signals across component carriers, thereby improving frequency usage efficiency and peak throughput.
Implementation Method 1
the uplink control channel processing section selects a plurality of allocated resources from the uplink control channel, and defines the states of the retransmission acknowledgement signals of the plurality of fundamental frequency blocks by bit information by phase shift modulation and channel selection information
Data Source
AI summary
The present invention is directed to efficiently transmitting feedback control information in a physical uplink control channel in a communication system having a system band formed with a plurality of fundamental frequency blocks. The present invention has a demodulation section that demodulates downlink shared channel signals for each of a plurality of fundamental frequency blocks, a detection section that detects the state of a retransmission acknowledgement signal of each of the plurality of fundamental frequency blocks based on the demodulated downlink shared channel signals, and an uplink control channel processing section that maps the retransmission acknowledgement signals of the plurality of fundamental frequency blocks to an uplink control channel of a specific fundamental frequency block that is selected from the plurality of fundamental frequency blocks, and the uplink control channel processing section selects a plurality of allocated resources from the uplink control channel, and defines the states of the retransmission acknowledgement signals of the plurality of fundamental frequency blocks by bit information by phase shift modulation and channel selection information.