PDCCH Occasion Scheduling for Consistent HARQ-ACK Transmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring robust and efficient transmission of control channels, particularly in multi-antenna systems like Multi-Transmission Reception Point (Multi-TRP) scenarios, which require enhanced coverage and reduced complexity.
Innovation Solution
A method is provided for determining PDCCH occasions and signaling to ensure consistent understanding of PDSCH resources and HARQ-ACK codebooks between the base station and the UE, using multiple PDCCHs for scheduling, and configuring reference PDCCH occasions to avoid collisions and optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PDCCH occasions are used for scheduling in multi-TRP systems, then transmission robustness is improved, but device complexity increases
Solution Approach 1:
The patent segments the control channel transmission by dividing PDCCH occasions into multiple instances (first PDCCH occasion for scheduling, second PDCCH occasion for HARQ-ACK determination). This segmentation allows the system to achieve robustness through multiple transmission points while managing complexity by assigning specific functions to each occasion, preventing the need for complex coordination across all PDCCH occasions.
Solution Approach 2:
The patent applies preliminary action by determining the first PDCCH occasion for PDSCH scheduling before determining the second PDCCH occasion for HARQ-ACK codebook determination. This sequential determination approach allows the system to establish the scheduling framework first, then build upon it with HARQ-ACK feedback mechanisms, reducing overall system complexity while maintaining robustness.
2Stability of the object's composition
If reference PDCCH occasions are configured for HARQ-ACK determination, then scheduling consistency is improved, but signaling overhead increases
Solution Approach 1:
The patent merges the functions of multiple PDCCH occasions by using the first PDCCH occasion for both scheduling PDSCH and determining HARQ-ACK codebook. This merging reduces signaling overhead by eliminating the need for separate reference PDCCH occasion configurations, while still maintaining scheduling consistency through the unified approach.
Solution Approach 2:
The patent applies universality by making the first PDCCH occasion serve multiple purposes: it is used for PDSCH scheduling and also as the reference for HARQ-ACK codebook determination. This multi-functionality reduces the need for additional dedicated reference signals, thereby reducing signaling overhead while maintaining scheduling consistency.
3Productivity
If multi-antenna techniques are enhanced for diversified application scenarios, then spectral efficiency is improved, but system complexity increases
Solution Approach 1:
The patent applies dynamics by enabling flexible configuration of PDCCH occasions based on different application scenarios. The system can dynamically adjust the number and positioning of PDCCH occasions depending on whether the scenario requires high robustness (e.g., coverage enhancement) or high spectral efficiency (e.g., URLLC), allowing the system to optimize performance for each scenario without being locked into a fixed complex structure.
Solution Approach 2:
The patent uses parameter changes by allowing the network to configure different parameters for PDCCH occasions (such as time intervals, frequency resources, and repetition counts) based on specific application requirements. This enables the system to adapt spectral efficiency and robustness parameters dynamically, achieving high spectral efficiency in suitable scenarios while managing complexity through parameter optimization rather than structural complexity.
Data Source
AI summary
The present application discloses a method and a device in a node for wireless communications. A node receives a first information block, the first information block being used to determine X1 PDCCH occasions; the node receives a first signaling and a first signal, the first signaling being used to determine a frequency-domain resource set occupied by the first signal in frequency domain; the node transmits a second signal, the second signal carrying a first bit block; the first signaling is used to determine a first time interval length, the first time interval length being used to determine a length of a time interval in time domain between a first PDCCH occasion and the first signal; a position of the first signal in time domain is used to determine a position of the second signal in time domain. The present application ensures the HARQ transmission.