Uplink Control Information Reporting Using CAZAC Codes
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Solution Overview
Problem
Conventional methods for reporting uplink control information in next-generation mobile communication systems are inefficient, particularly for acknowledgment information, which requires high quality but is limited to a single bit, making it difficult to obtain coding gain and requiring resource allocation through downlink L1/L2 control signals.
Innovation Solution
A user apparatus uses a single carrier scheme to efficiently report uplink control information by employing CAZAC codes and block spread codes, allowing for orthogonal transmission of control signals, thereby reducing the need for frequent resource allocation and enhancing the quality of acknowledgment information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If acknowledgment information is transmitted using a single bit, then the transmission overhead is reduced, but the reliability and quality of transmission deteriorates
Solution Approach 1:
The patent changes the parameter of acknowledgment information from a single bit to multiple bits by introducing virtual acknowledgments. This allows the system to maintain the simplicity of single-bit transmission while achieving the reliability of multi-bit transmission through codebook-based selection and implicit signaling mechanisms.
2Adaptability or versatility
If downlink L1/L2 control signals are used to allocate resources for uplink control information, then resource allocation flexibility is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent extracts the resource allocation information from downlink L1/L2 control signals and embeds it directly in the uplink control information transmission. By using the physical uplink control channel resources and codebook structures already allocated, the system eliminates the need for separate resource allocation signaling, thereby reducing overhead while maintaining flexibility.
3Reliability
If frequent resource allocation is performed for uplink control information, then transmission quality is improved, but system efficiency and throughput deteriorate
Solution Approach 1:
The patent performs preliminary action by pre-configuring codebooks and resource structures for uplink control information transmission. The base station and user equipment prepare the acknowledgment codebooks and resource mappings in advance, allowing multiple acknowledgments to be transmitted using pre-allocated resources without requiring frequent re-allocation, thus maintaining high transmission quality while improving system efficiency.
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 receive a downlink control signal and a downlink data signal; a unit configured to prepare acknowledgement information indicating positive acknowledgement or negative acknowledgement for the downlink data signal; a unit configured to prepare the uplink control signal including the acknowledgement information; a unit configured to transmit the uplink control signal using different resources which are different from resources that can be used for an uplink data signal; and a storage unit configured to store predetermined correspondence relationship which uniquely associates resources of the downlink control signal or the downlink data signal with resources used for the uplink control signal.