HARQ Process ID Determination in 5G NR Multi-TRP Configured Grants
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Solution Overview
Problem
In wireless communication systems, particularly in multi-TRP and 5G NR scenarios, determining the correct HARQ process ID/number for multiple PDSCH/PUSCH transmissions with single DCI format is challenging, leading to misunderstandings and increased complexity and costs across various application scenarios.
Innovation Solution
A method involving the use of distinct signaling groups to determine time-frequency resource pools and numerical values, ensuring accurate HARQ process numbering, thereby simplifying the use of multiple Configured Grants and reducing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple Configured Grants are used for transmission of repetitions of a Transport Block, then transmission reliability is improved, but determining the corresponding HARQ Process ID becomes complex and ambiguous
Solution Approach 1:
The patent segments the determination of HARQ Process ID into multiple independent components: (1) base HARQ Process ID from DCI format, (2) offset value from higher layer parameters, and (3) repetition index from time-frequency resource identification. This segmentation eliminates ambiguity by providing a clear hierarchical structure for ID determination across multiple Configured Grants.
Solution Approach 2:
The patent introduces an intermediary offset mechanism that mediates between the base HARQ Process ID and the final effective HARQ Process ID. This offset, determined by higher layer parameters and time-frequency resource identification, acts as a bridge to resolve conflicts when multiple Configured Grants share the same base ID, ensuring unique identification for each transmission.
2Loss of energy
If a single DCI format schedules multiple PDSCHs/PUSCHs, then signaling overhead is reduced, but the relationship between scheduled channels and HARQ Process ID becomes ambiguous
Solution Approach 1:
The patent resolves the ambiguity by adding another dimension to HARQ Process ID determination: instead of relying solely on the DCI-scheduled channel index, it incorporates the time-frequency resource pool identification as an additional dimension. This multi-dimensional approach maintains single DCI efficiency while ensuring unique HARQ Process ID assignment for each scheduled PDSCH/PUSCH.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple time-frequency resource pools with distinct identification parameters before scheduling occurs. This pre-configuration ensures that when a single DCI schedules multiple channels, each channel can be uniquely identified through its pre-assigned resource pool, eliminating the need for complex runtime resolution.
3Reliability
If multi-TRP techniques are implemented to enhance robustness, then communication reliability improves, but the complexity of managing multiple TRPs increases system complexity
Solution Approach 1:
The patent applies universality by designing a unified HARQ Process ID determination mechanism that works across all TRPs and all Configured Grants. The same formula and parameters (base ID + offset + resource identification) are universally applied regardless of which TRP or which grant is used, simplifying multi-TRP management while maintaining robustness.
Solution Approach 2:
The patent uses parameter changes to differentiate between multiple TRPs and grants: instead of creating complex management structures, it changes the values of existing parameters (offset values, resource pool indices, repetition indexes) to uniquely identify each transmission. This parameter-based differentiation maintains simplicity while supporting multiple TRPs.
Data Source
AI summary
The present disclosure provides a method and a device in a node used for wireless communications: a first receiver, receiving a first signaling group and a second signaling group; and a first transceiver, transmitting a first signal, or, receiving a first signal in a first time-frequency resource pool; herein, the first signaling group and the second signaling group respectively indicate a first index and a second index, the first index being different from the second index; the first signaling group is used to determine the first time-frequency resource pool; the second signaling group is used to determine a second numerical value set; a second numerical value is used to determine a HARQ process number corresponding to the first signal, the second numerical value belonging to the second numerical value set.