DCI Format Ordering for HARQ-ACK Uplink Resource Allocation
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Solution Overview
Problem
Existing wireless communication systems face challenges in determining the order of multiple DCI formats and uplink transmission resources for HARQ-ACK information, particularly in scenarios involving multiple serving cells and variable HARQ-ACK feedback delays.
Innovation Solution
A method and apparatus for a terminal in a wireless communication system that involves receiving multiple DCI formats, determining their order, and allocating uplink transmission resources for HARQ-ACK information based on this order, utilizing a controller and transceiver to manage these processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple DCI formats are received in parallel without ordering, then reception speed is improved, but determination of transmission resource order becomes complex
Solution Approach 1:
The base station performs preliminary ordering of DCI formats before transmission by determining the order in advance based on uplink grant information and HARQ-ACK timing. This preliminary action eliminates the need for complex real-time ordering at the terminal, allowing parallel reception while maintaining clear order determination.
Solution Approach 2:
Downlink assignment index (DAI) values are introduced as intermediary indicators to mark the order of DCI formats. These DAI values serve as mediators that carry ordering information without requiring complex processing, enabling the terminal to determine the sequence of multiple DCI formats efficiently.
2Adaptability or versatility
If fixed HARQ-ACK feedback delay is used, then resource allocation is simple, but adaptability to varying service requirements is reduced
Solution Approach 1:
The HARQ-ACK feedback delay is made dynamic rather than fixed. The base station can flexibly adjust the timing between downlink data transmission and HARQ-ACK reception based on service requirements, terminal capabilities, and resource availability. This dynamic approach allows adaptation to varying service requirements while maintaining manageable resource allocation through standardized timing indication mechanisms.
3Adaptability or versatility
If DCI ordering is determined at terminal side, then flexibility is improved, but processing complexity increases
Solution Approach 1:
The base station performs the ordering action preliminarily by determining the DCI format sequence before transmission based on uplink grant assignments and HARQ-ACK timing requirements. This shifts the processing burden from the terminal to the base station, maintaining flexibility in ordering while reducing terminal complexity.
Solution Approach 2:
DAI values serve as intermediary markers embedded in DCI formats to indicate their positional order. Instead of requiring the terminal to perform complex ordering algorithms, the DAI intermediaries carry the ordering information explicitly, enabling simple sequential processing at the terminal side.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. An apparatus and a method performed by the same in a wireless communication system are provided. The method includes receiving a plurality of downlink control information (DCI), determining an order of each DCI format of the plurality of DCI; and determining an uplink transmission resource for transmitting hybrid automatic repeat request-acknowledgement (HARQ-ACK) information based on the determined order. The invention can improve communication efficiency.