PUCCH Carrier Switching for HARQ Feedback Latency
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Solution Overview
Problem
Current implementations of PUCCH carrier switching in new radio (NR) Release 17 are incomplete, particularly in handling collisions between dynamic and semi-static PUCCH transmissions, which affect HARQ feedback latency and efficiency.
Innovation Solution
The method involves determining whether the first mode (dynamic DCI configuration) or second mode (RRC configuration) of PUCCH carrier switching is enabled, and handling collisions by either multiplexing or delaying HARQ feedbacks, allowing flexible configuration and efficient transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If PUCCH carrier switching is implemented based on dynamic DCI configuration only, then HARQ feedback latency is reduced, but collision handling between dynamic and semi-static PUCCH transmissions becomes complex and inefficient
Solution Approach 1:
The patent segments the PUCCH carrier switching mechanism into two independent modes: dynamic mode (based on DCI) and semi-static mode (based on RRC configuration). Each mode handles different types of PUCCH transmissions separately, allowing simple collision handling rules for each mode while maintaining low latency. The terminal device determines which mode applies based on the scheduling type, avoiding complex interactions between modes.
Solution Approach 2:
The patent introduces dynamic adaptability by allowing the network to flexibly configure which mode (dynamic or semi-static) applies to specific PUCCH transmissions based on actual traffic conditions. The terminal device can dynamically switch between modes depending on whether the transmission is dynamically scheduled or semi-persistently scheduled, optimizing collision handling for each scenario without requiring complex unified rules.
2Productivity
If multiple UL carriers are configured for PUCCH transmission, then spectral efficiency is improved, but collision between PUCCH transmissions on different carriers increases
Solution Approach 1:
The patent applies different quality characteristics to different PUCCH transmission scenarios. For dynamically scheduled PDSCH, the patent uses dynamic mode with DCI-based carrier switching to minimize latency. For semi-persistently scheduled PDSCH, the patent uses semi-static mode with RRC-based configuration to handle collisions more predictably. This localized approach allows each transmission type to have optimized handling tailored to its specific characteristics.
Solution Approach 2:
The patent introduces an intermediary decision mechanism at the terminal device that determines which mode (dynamic or semi-static) to apply based on the scheduling type. This intermediary layer resolves collisions by first classifying the transmission type and then applying the appropriate handling rules, preventing direct conflicts between different transmission modes on multiple carriers.
3Reliability
If PUCCH carrier switching is enabled for both dynamic and semi-persistent scheduling, then HARQ feedback completeness is improved, but collision handling between different scheduling types becomes complex
Solution Approach 1:
The patent segments the collision handling logic by separating dynamic and semi-static PUCCH transmissions into distinct processing paths. The terminal device first identifies whether the transmission is dynamically scheduled or semi-persistently scheduled, then applies the corresponding mode-specific rules. This segmentation eliminates the need for complex unified collision handling while ensuring both feedback types are transmitted reliably.
Solution Approach 2:
The patent applies preliminary classification of transmission types before collision handling occurs. The terminal device determines whether to use dynamic mode or semi-static mode based on the scheduling type in advance, preparing the appropriate handling rules before any potential collision occurs. This preliminary action simplifies the actual collision resolution process by eliminating uncertainty about which rules apply.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for communication. A terminal device receives, from a network device, an indication on whether one of a first mode and a second mode of PUCCH carrier switching is enabled, the first mode being based on a dynamic configuration in DCI, the second mode being based on an RRC configuration; and in accordance with a determination that the one of the first mode and the second mode is enabled, perform the PUCCH carrier switching for a PUCCH transmission to be processed. In this way, PUCCH carrier switching may be flexibly configured.