Uplink Control Channel Multiplexing CQI and ACK/NACK
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Solution Overview
Problem
Conventional technologies inadequately address the efficient transmission of uplink control information in next-generation mobile communication systems, particularly in terms of varying quality and bit requirements for CQI and ACK/NACK signals, leading to potential errors and throughput issues.
Innovation Solution
A user apparatus and base station system that multiplexes and processes CQI and ACK/NACK information using CAZAC codes, channel coding, and block-by-block modulation patterns to ensure reliable transmission, adjusting transmission power and using orthogonal code sequences to maintain orthogonality and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CQI and ACK/NACK information are transmitted using the same uplink control channel resources, then resource utilization is improved, but transmission reliability deteriorates due to different quality requirements
Solution Approach 1:
The patent segments the uplink control information into different parts with different reliability requirements. CQI information (especially lower-order bits) and ACK/NACK information are handled differently through selective mapping to repetition blocks, allowing each type of information to receive appropriate protection levels while sharing the same physical channel resources.
Solution Approach 2:
Different portions of the control information are assigned different quality levels through the mapping process. Higher-order CQI bits and ACK/NACK information are mapped to blocks with higher repetition counts, ensuring they receive better protection, while lower-order bits receive proportionally less protection, optimizing the overall resource utilization while maintaining necessary reliability.
2Reliability
If channel coding rate is reduced to improve error tolerance, then transmission reliability is improved, but transmission efficiency deteriorates
Solution Approach 1:
Instead of applying uniform channel coding to all control information, the patent applies coding selectively and partially. Different repetition block groups receive different coding treatments based on the importance of the information they carry, avoiding the overhead of full coding while still providing necessary error tolerance for critical information.
Solution Approach 2:
The patent changes the coding parameter (coding rate) dynamically based on the information type and channel conditions. By adjusting the coding rate for different block groups carrying different control information, the system achieves optimal balance between error tolerance and transmission efficiency without using excessively low coding rates for all data.
3Reliability
If all CQI bits are transmitted with high reliability, then error tolerance is improved, but resource consumption increases
Solution Approach 1:
The patent applies different quality levels to different CQI bits based on their significance. Higher-order bits that carry more critical information are mapped to repetition blocks with higher protection, while lower-order bits are mapped to blocks with proportionally less protection, avoiding the waste of applying high reliability protection to all bits uniformly.
Solution Approach 2:
The system applies high reliability transmission only partially to the most critical CQI bits rather than to all bits. This partial application of high reliability measures reduces resource consumption while still maintaining sufficient error tolerance for the most important control information.
Data Source
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AI summary
A user apparatus transmits an uplink control signal to a base station apparatus using a single carrier scheme. The user apparatus includes: a unit configured to prepare acknowledgement information indicating positive acknowledgement or negative acknowledgement for a downlink data signal based on a result of demodulation of the downlink data signal; a unit configured to prepare channel state information indicating reception quality of a downlink reference signal; a unit configured to channel-code multiplexed control information in which the acknowledgement information and the channel state information are multiplexed to prepare the uplink control signal; and a unit configured to transmit the uplink control signal using dedicated resources different from resources for an uplink data signal.