ACK/NACK Resource Mapping for Carrier Aggregation
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Solution Overview
Problem
In evolved wireless communication systems employing carrier aggregation or relay technology, conventional methods for determining ACK/NACK resources are inadequate, leading to challenges in accurately transmitting ACK/NACK information for downlink transmission.
Innovation Solution
A method is proposed to semi-statically allocate and map ACK/NACK resource sets to downlink subframes, allowing for flexible association of ACK/NACK resources with uplink subframes, even in systems where the number of associated downlink subframes changes over time, ensuring accurate ACK/NACK transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ACK/NACK resource determination methods are used, then the system is simple to operate, but the system cannot accurately transmit ACK/NACK information in evolved wireless communication systems with carrier aggregation or relay technology
Solution Approach 1:
The patent divides the ACK/NACK resource determination into multiple components: downlink subframe index, number of downlink subframes, and uplink subframe association. This segmentation allows the system to handle complex carrier aggregation and relay scenarios by breaking down the resource determination into manageable parts that can be systematically combined.
Solution Approach 2:
The patent introduces dynamic adaptation by allowing the number of downlink subframes associated with each uplink subframe to change over time based on system configuration. This dynamic approach enables the same resource determination method to work across different scenarios including carrier aggregation and relay technology without requiring separate complex mechanisms.
2Adaptability or versatility
If the number of downlink subframes associated with each uplink subframe is fixed, then the resource allocation is simple, but the system cannot adapt to changing system configurations in evolved wireless communication systems
Solution Approach 1:
The patent performs preliminary determination of the number of downlink subframes associated with each uplink subframe before actual ACK/NACK resource allocation. This preliminary action establishes a flexible foundation that can adapt to different system configurations including carrier aggregation and relay technology, while maintaining systematic resource management.
Solution Approach 2:
The patent changes the parameter of downlink subframe association from a fixed value to a variable that can be adjusted based on system configuration. By allowing this parameter to change, the system gains versatility to handle evolved wireless communication scenarios while maintaining a structured approach to resource determination.
Data Source
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AI summary
A wireless communication system and a method and apparatus for transmitting ACK/NACK for downlink transmission in a wireless communication system are disclosed. The method for transmitting ACK/NACK information for a downlink transmission in a receiver of a wireless communication system includes being configured with N physical uplink control channel (PUCCH) resources respectively having indexes 0, 1, 2,..., and N-l by a higher layer, receiving the downlink transmission from a transmitter in a downlink subframe set including M (1<M<N) downlink subframes, and transmitting the ACK/NACK information for the downlink transmission in the downlink subframe set to the transmitter in one uplink subframe associated with the downlink subframe set. Each of the M PUCCH resources respectively having the indexes 0, 1, 2,..., and M-1 among the N PUCCH resources configured with respect to the receiver corresponds to each of the M downlink subframes.