ACK/NACK Transmission via Implicit and Explicit PUCCH Resources
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Solution Overview
Problem
Current wireless communication systems face challenges in effectively transmitting ACK/NACK information due to limitations in channel formats and resource allocation methods, leading to inefficiencies in control information transmission.
Innovation Solution
A method for transmitting ACK/NACK information in a wireless communication system involves receiving physical downlink control channels and physical uplink control channel resource information, with initial and repetition transmission processes using multiple antenna ports, allowing for efficient resource allocation and improved control information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ACK/NACK information is transmitted using a single PUCCH resource, then the transmission process is simple, but the reliability of control information transmission is reduced
Solution Approach 1:
The patent segments the ACK/NACK transmission into multiple independent transmissions using different PUCCH resources. Each transmission uses a distinct PUCCH resource index, allowing the system to divide the single transmission task into multiple redundant transmission instances, thereby improving reliability through diversity without requiring a completely new transmission mechanism
Solution Approach 2:
The patent changes the PUCCH resource index parameter to create multiple transmission instances. By deriving different PUCCH resource indices from the same PDCCH CCE index through mathematical transformations, the system varies the transmission parameters to achieve diversity gain while maintaining a systematic and manageable approach to multiple transmissions
2Reliability
If multiple PUCCH resources are used for ACK/NACK transmission, then transmission reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously determine multiple PUCCH resource indices through predefined mathematical relationships with the PDCCH CCE index. This self-determination mechanism eliminates the need for explicit network configuration of multiple resources, allowing the system to achieve multiple transmission diversity while maintaining simple resource allocation procedures
Solution Approach 2:
The patent makes the PUCCH resource allocation mechanism universal by using a single CCE index to serve multiple PUCCH resource derivations. The same CCE index information is used to generate multiple different PUCCH resource indices through different mathematical operations, allowing one source parameter to fulfill multiple transmission resource needs
3Reliability
If ACK/NACK information is transmitted through multiple antenna ports, then transmission robustness is enhanced, but the device complexity increases
Solution Approach 1:
The patent segments the transmission across multiple antenna ports by associating different PUCCH resource indices with different antenna ports. This segmentation allows the ACK/NACK information to be transmitted through multiple spatial paths independently, enhancing robustness against fading or interference on any single antenna while maintaining manageable processing through clear port-resource mapping
Data Source
AI summary
A method and user equipment (UE) for transmitting ACK/NACK information, and a method and base station (BS) for receiving ACK/NACK information are disclosed. If ACK/NACK repetition and spatial orthogonal-resource transmit diversity (SORTD) caused by 2 antenna ports are configured in the UE, the UE performs first ACK/NACK transmission using 2 PUCCH resources implicitly decided by an associated PDCCH. From the second transmission, the UE performs ACK/NACK transmission using 2 PUCCH resources explicitly assigned respectively for the two antenna ports.