ACK/NACK Joint Coding for LTE-A Uplink Control
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Solution Overview
Problem
In LTE-A systems, the increased number of component carriers leads to a significant increase in feedback control information, necessitating efficient transmission methods for feedback control information on uplink channels to maintain spectral efficiency and peak data rates.
Innovation Solution
A mobile terminal apparatus with a demodulation section, ACK/NACK determining section, ACK/NACK signal coding section, and ACK/NACK signal processing section is configured to demodulate downlink shared data channels, determine ACK/NACK states, collectively code states across multiple base frequency blocks, and perform orthogonal signal processing to reduce the number of states notified and efficiently transmit feedback control information on the physical uplink control channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control information for multiple downlink component carriers is transmitted individually, then transmission accuracy is improved, but the amount of feedback control information increases significantly
Solution Approach 1:
The patent combines feedback control information from multiple downlink component carriers into a single feedback signal. The mobile terminal apparatus transmits aggregated ACK/NACK information for multiple CCs through one PUCCH resource, rather than transmitting separate feedback signals for each carrier, thereby reducing the total amount of feedback information while maintaining transmission accuracy through joint coding techniques
2Productivity
If the number of component carriers is increased to improve spectral efficiency, then peak data rate is improved, but the complexity of feedback control information transmission increases
Solution Approach 1:
The patent creates a universal feedback transmission mechanism that can handle multiple component carriers through a single PUCCH resource. The mobile terminal apparatus uses joint coding to encode ACK/NACK information from multiple CCs into one signal, allowing the same transmission infrastructure to serve multiple carriers without increasing per-carrier complexity
Solution Approach 2:
The patent changes the coding parameters and signal processing methods to efficiently handle feedback from multiple component carriers. By using joint coding techniques and adjusting the coding rate based on the number of active CCs, the system maintains manageable complexity while supporting increased spectral efficiency through carrier aggregation
3Quantity of substance
If feedback control information for multiple base frequency blocks is coded collectively, then the maximum number of coded bits is reduced, but signal processing complexity increases
Solution Approach 1:
The patent performs preliminary signal processing and coding operations at the mobile terminal apparatus before transmission. The ACK/NACK information from multiple base frequency blocks is collected, coded jointly, and prepared in advance, which reduces the number of coded bits that need to be transmitted while distributing the processing complexity across multiple processing stages
Data Source
AI summary
To provide a mobile terminal apparatus and radio communication method for enabling feedback control information to be efficiently transmitted on a physical uplink control channel, a mobile terminal apparatus of the invention receives downlink shared data channels parallel in a plurality of CCs, makes determinations on the downlink shared data channels about ACK/NACK/DTX, collectively codes determination results (states) of the plurality of CCs after reducing the number of states allowed to be notified individually, and performs signal processing on the coded data to be orthogonalized between users to transmit.