PUCCH HARQ Feedback Scheduling for Multicast-Unicast Conflicts
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Solution Overview
Problem
Existing communication technologies face challenges in resolving conflicts between multicast and unicast resource configurations for hybrid automatic repeat request (HARQ) information feedback, leading to potential impacts on feedback reliability.
Innovation Solution
A method is proposed to handle resource conflicts by determining the priority and time unit granularity of HARQ information for multicast and unicast services, allowing for either concatenation or sending one of the HARQ information and discarding the other, or concatenating the HARQ information when time units overlap, thereby improving feedback reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both multicast PUCCH-config and unicast PUCCH-config are configured for the terminal device, then the terminal device can send HARQ information for both multicast and unicast services, but resource conflicts occur when time units overlap, impacting feedback reliability
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the time unit granularity for different services. When a resource conflict is detected between multicast and unicast HARQ feedback, the terminal device changes the granularity parameter of the time unit for one of the services (typically using finer granularity for unicast and coarser for multicast) to resolve the overlap. This allows both services to be supported while avoiding resource conflicts, thereby maintaining feedback reliability.
2Loss of information
If the terminal device sends both first HARQ information and second HARQ information in overlapping time units, then complete feedback information is provided, but resource conflicts occur leading to transmission failures
Solution Approach 1:
The patent applies segmentation by dividing the HARQ feedback transmission into separate time units with different granularities. When a conflict is detected, the terminal device segments the feedback by transmitting one HARQ information in a coarser time unit and the other in a finer time unit, or in different frequency resources within the overlapping period. This ensures that both pieces of feedback information are transmitted reliably without mutual interference.
3Reliability
If the terminal device discards one HARQ information to avoid conflict, then resource conflict is resolved, but feedback information is lost
Solution Approach 1:
The patent applies dimensionality change by introducing additional resources or time dimensions for HARQ feedback transmission. Instead of simply discarding conflicting feedback, the terminal device transmits both pieces of HARQ information by utilizing different dimensions - such as different frequency resources, different spatial layers, or different time slots within the overlapping period. This ensures that no feedback information is lost while resolving the resource conflict.
Data Source
AI summary
Example methods and apparatuses are described. An example method includes: receiving first physical uplink control channel (PUCCH) configuration information corresponding to a first service and second PUCCH configuration information corresponding a second service, and respectively indicate a granularity of a first time unit and a granularity of a second time unit; determining first hybrid automatic repeat request (HARQ) information and second HARQ information, where a priority of the first HARQ information is the same as a priority of the second HARQ information; and in response to determining that the granularity of the first time unit is different from the granularity of the second time unit, feeding back the first HARQ information in the first time unit and the second HARQ information in the second time unit, wherein the first time unit and the second time unit do not overlap in time domain.