CSI-Part1 Mapping in UCI-Only Frequency Hopping
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Solution Overview
Problem
In a 5G mobile communications system, during a UCI-only scenario, information in CSI-part1 is incompletely sent due to insufficient mapping of coded bits onto the second frequency hopping resource, leading to incomplete transmission of CSI-part1 during frequency hopping.
Innovation Solution
The communication method involves adjusting the CSI-part1 mapping rule by ensuring that the quantity of coded bits mapped onto the second frequency hopping resource is increased, allowing more resource elements for CSI-part1, thereby ensuring complete transmission of CSI-part1 by reducing the number of coded bits reserved for HARQ-ACK on both frequency hopping resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping is applied to transmit UCI on PUSCH, then frequency diversity gain is improved, but CSI-part1 transmission completeness deteriorates due to insufficient resource elements on the second hop
Solution Approach 1:
The patent changes the mapping parameters for CSI-part1 by allocating resource elements based on the first hop's resource availability rather than the second hop's limited resources. This parameter adjustment ensures that CSI-part1 can be completely mapped onto the first hop's resource elements, resolving the information loss issue while maintaining frequency hopping's diversity gain
Solution Approach 2:
The patent performs preliminary allocation of resource elements for CSI-part1 on the first hop before frequency hopping occurs. By pre-allocating sufficient resource elements on the first hop to accommodate all CSI-part1 coded bits, the system ensures complete transmission of CSI-part1 without relying on the limited resources of the second hop
2Reliability
If resource elements are reserved for HARQ-ACK on both frequency hopping resources, then HARQ-ACK reliability is improved, but available resource elements for CSI-part1 on the second hop are reduced
Solution Approach 1:
The patent extracts the resource allocation decision for CSI-part1 from the second hop and relocates it to the first hop. By taking out the CSI-part1 mapping from the resource-constrained second hop and placing it entirely on the first hop, the system resolves the conflict between HARQ-ACK reliability and CSI-part1 resource availability
Solution Approach 2:
The patent shifts the CSI-part1 resource allocation from the time-frequency dimension of the second hop to the time-frequency dimension of the first hop. This dimensional relocation allows CSI-part1 to utilize the abundant resources of the first hop while leaving the second hop's resources available for HARQ-ACK and other UCI types
Data Source
AI summary
The present disclosure relates to communication methods in a UCI-only scenario. One example method includes receiving downlink control information used to schedule a PUSCH, where the PUSCH includes a first frequency hopping resource and a second frequency hopping resource, and a time-domain start symbol of the first frequency hopping resource is before a time-domain start symbol of the second frequency hopping resource, and sending first UCI on the PUSCH, where the first UCI includes at least one of an HARQ-ACK, CSI-part1, or CSI-part2, where a quantity GCSI-part1(1) of coded bits that are of the CSI-part1 in the first UCI and that are mapped onto the first frequency hopping resource is a smaller one of a fourth value and a fifth value.