PUCCH Joint-Coding for Control Information Efficiency
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting control information, particularly in resource allocation and channel formats, which affect the overall performance of control information transmission.
Innovation Solution
A method and apparatus for transmitting control information through a physical uplink control channel (PUCCH) using joint-coding and spreading modulation symbols, specifically employing single carrier-frequency division multiplexing (SC-FDMA) with orthogonal codes to efficiently allocate resources and maintain single carrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple control information are transmitted separately through PUCCH, then each control information can be independently processed, but the resource allocation becomes inefficient and the transmission overhead increases
Solution Approach 1:
The patent combines multiple control information (ACK/NACK for multiple downlink carriers, CQI, SR) into a single uplink control message. This is achieved by jointly encoding multiple acknowledgment bits from carrier aggregation into one codeword, and multiplexing different control information types (ACK/NACK, CQI, SR) into a single PUCCH transmission, thereby reducing the number of separate transmissions required and improving resource utilization efficiency
2Productivity
If carrier aggregation is implemented to increase downlink capacity, then the system can serve more users and increase throughput, but the complexity of control information transmission increases significantly
Solution Approach 1:
The patent segments control information transmission by separating acknowledgment bits from different downlink carriers and processing them independently through joint encoding. Each downlink carrier's ACK/NACK is generated separately, then all acknowledgment bits are jointly encoded together with other control information (CQI, SR) to form a unified control message, reducing the overall complexity compared to transmitting separate control messages for each carrier
3Reliability
If more PUCCH resources are allocated to transmit increased control information, then all control information can be transmitted reliably, but the uplink resource consumption increases
Solution Approach 1:
The patent changes the encoding parameters by using joint encoding that adapts the code rate and modulation scheme based on the total amount of control information to be transmitted. The system selects appropriate coding schemes (convolutional coding, tail-biting convolutional coding) and modulation orders (QPSK, 16-QAM) based on the payload size, allowing reliable transmission of aggregated control information without requiring proportional increases in resource allocation
Data Source
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AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method for transmitting control signal via a PUCCH in a wireless communication system, and to an apparatus for the method, wherein the method comprises the following steps: joint-coding a plurality of pieces of control information to obtain a single codeword; obtaining a first modulation symbol sequence from the single codeword; obtaining, from the first modulation symbol sequence, a plurality of second modulation symbol sequences corresponding to each slot in the PUCCH; cyclically shifting the plurality of second modulation symbol sequences in a time domain to obtain a plurality of third modulation symbol sequences; performing a discrete Fourier transform (DFT) precoding process on the plurality of third modulation symbol sequences to obtain a plurality of complex symbol sequences in a frequency domain; and transmitting the plurality of complex symbol sequences via the PUCCH.