PUCCH Format 3 for Expanded ACK/NACK Capacity
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in transmitting control information, particularly in scenarios involving carrier aggregation, where the number of ACK/NACK bits exceeds the capacity of conventional PUCCH formats, leading to challenges in resource allocation and signal processing.
Innovation Solution
A new PUCCH format (PUCCH format 3) is introduced, utilizing DFT-based precoding and time-domain orthogonal cover codes to efficiently transmit increased UCI, including ACK/NACK bits, by channel encoding multiple bits jointly and applying DFT precoding followed by SC-FDMA transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional PUCCH formats (1a/1b) are used for ACK/NACK transmission, then device complexity is reduced and ease of operation is maintained, but the capacity to transmit control information is insufficient when the number of ACK/NACK bits exceeds the format capacity
Solution Approach 1:
The patent changes the parameters of the PUCCH format by introducing a new format (Format 3) with different modulation schemes (QPSK, 16-QAM, 64-QAM) and coding rates to accommodate varying numbers of ACK/NACK bits. This allows the system to adapt the transmission capacity by selecting appropriate modulation and coding parameters based on the payload size, thereby increasing information capacity while maintaining manageable complexity through parameter selection rather than structural redesign
Solution Approach 2:
The patent segments the control information transmission by dividing it into multiple PUCCH resources or formats. When the number of ACK/NACK bits exceeds the capacity of conventional formats, the system segments the transmission using multiple resource blocks or switches to PUCCH Format 3 with extended capacity. This segmentation allows the system to handle large control information volumes by distributing or adapting the transmission across multiple resources, solving the capacity limitation without requiring complete redesign of the entire PUCCH structure
2Quantity of substance
If the number of ACK/NACK bits increases in carrier aggregation scenarios, then the quantity of control information transmitted is improved, but resource allocation becomes more difficult and inefficient
Solution Approach 1:
The patent creates a universal PUCCH resource allocation mechanism that works for both small and large numbers of ACK/NACK bits. PUCCH Format 3 is designed to handle variable payload sizes through configurable modulation and coding schemes, making it a multi-functional solution that can accommodate different carrier aggregation scenarios without requiring separate specialized formats for each case. This universal approach simplifies resource allocation by providing a single flexible format rather than multiple rigid formats
Solution Approach 2:
The patent introduces dynamic resource allocation where the PUCCH format parameters (modulation scheme, coding rate, resource block assignment) can be dynamically adjusted based on the number of ACK/NACK bits that need to be transmitted. This dynamic adaptation allows the system to optimize resource usage for each specific transmission scenario, improving allocation efficiency by matching resources to actual needs rather than using fixed allocations that may be over or under-provisioned
3Reliability
If DFT-based precoding and joint channel encoding are applied to transmit multiple ACK/NACK bits, then the reliability of control information transmission is improved, but the device complexity and signal processing requirements increase
Solution Approach 1:
The patent applies preliminary channel encoding and DFT-based precoding to the control information before transmission. By performing these processing operations in advance at the transmitter, the system ensures that the control information is properly protected and formatted before entering the transmission channel. This preliminary action improves reliability by pre-establishing error correction capabilities and signal structure, while the complexity is managed by performing these operations once during transmission preparation rather than continuously during reception and processing
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
The present invention relates to a wireless communication system, and more specifically, to a method and a device for transmitting/receiving uplink control information. The method for a terminal to transmit confirmation response information in a wireless communication system according to one embodiment of the present invention comprises: a step for determining a PUCCH (physical uplink control channel) format and resource, in which confirmation response information is transmitted in response to a downlink transmission in a downlink sub-frame set including M(M≥1)downlink sub-frame; and a step for transmitting the confirmation response information using the PUCCH format and resource in one uplink sub-frame. Here, one excess serving cell is set to a terminal, and the one excess serving cell can include one PCell and at least one SCell. The confirmation response information can be transmitted using a PUCCH format 1a/1b when one PDSCH (physical downlink shared channel), from which a corresponding PDCCH (physical downlink control channel) is not detected, exists only on PCell in the downlink sub-frame set, and a SPS (semi-persistent scheduling) releasing PDCCH does not exist in the downlink sub-frame set.