Terminal HARQ-ACK Channel Selection for Multicast Uplink Overlap
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Solution Overview
Problem
In future radio communication systems like NR, the processing of hybrid automatic repeat request acknowledgement (HARQ-ACK) for multicast downlink data is not fully studied, leading to potential system performance degradation such as throughput reduction.
Innovation Solution
A terminal determines and transmits channels for hybrid automatic repeat request acknowledgement (HARQ-ACK) when a physical uplink control channel overlaps with an uplink channel in the time domain, resolving collisions by mapping HARQ-ACK to a PUSCH or transmitting on a PUCCH based on specific conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK for multicast downlink data is transmitted on PUCCH, then acknowledgment reliability is improved, but channel collision occurs when PUCCH overlaps with uplink channel in time domain
Solution Approach 1:
The patent introduces a determination mechanism that acts as an intermediary between HARQ-ACK transmission and uplink channel transmission. When overlap is detected, the system selectively determines whether to transmit HARQ-ACK on PUCCH or PUSCH based on specific conditions (unicast vs multicast data types), thereby mediating the conflict between reliable acknowledgment transmission and avoiding channel collision.
Solution Approach 2:
The patent changes the transmission parameter (transmission channel selection) based on the type of downlink data. When unicast data is detected, HARQ-ACK is transmitted on PUCCH; when multicast data is detected, it is transmitted on PUSCH. This parameter change resolves the contradiction by adapting the transmission method to the specific data type, avoiding collision while maintaining reliability.
2Productivity
If channel overlap is avoided by selective transmission, then system performance is improved, but transmission flexibility is reduced
Solution Approach 1:
The patent applies different transmission strategies to different types of downlink data locally. Unicast data follows one transmission path (PUCCH), while multicast data follows another (PUSCH). This local differentiation maintains system performance by avoiding collision for multicast while preserving transmission flexibility and reliability for unicast, resolving the contradiction between performance and adaptability.
3Device complexity
If HARQ-ACK processing is not performed, then device complexity is reduced, but system performance degrades due to throughput reduction
Solution Approach 1:
The patent extracts the HARQ-ACK processing function from the general uplink transmission process and handles it separately based on data type. By identifying and separately processing multicast and unicast data scenarios, the system maintains necessary HARQ-ACK processing for throughput while avoiding unnecessary complexity in collision scenarios through clear conditional logic.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a control section that, when a physical uplink control channel (PUCCH) for transmission of hybrid automatic repeat reQuest acknowledgement (HARQ-ACK) information for a multicast physical downlink shared channel (PDSCH) overlaps with an uplink channel in a time domain, determines at least one channel of the PUCCH and the uplink channel, and a transmitting section that transmits the channel. According to one aspect of the present disclosure, it is possible to appropriately performs processing of the HARQ-ACK for multicast downlink data.