SPS Downlink Control Activation With Multi-PDSCH HARQ-ACK
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing downlink control information for semi-persistent scheduling (SPS) in New Radio (NR) networks, leading to suboptimal resource allocation and increased latency.
Innovation Solution
Implementing mechanisms for downlink control information activation and HARQ-ACK feedback for SPS in NR networks, including multi-PDSCH scheduling, DAI counter procedures, and HARQ process ID determination to optimize resource allocation and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semi-persistent scheduling is implemented in NR networks, then resource allocation efficiency is improved, but downlink control information management complexity increases
Solution Approach 1:
The patent segments downlink control information into multiple parts distributed across different downlink transmissions. Instead of conveying all SPS activation information in a single DCI message, the information is divided and transmitted over multiple PDSCH occasions, reducing the complexity of any single control message while maintaining overall scheduling efficiency.
Solution Approach 2:
The patent employs preliminary action by pre-configuring SPS parameters through RRC signaling before actual data transmission. This preliminary configuration establishes the foundation for efficient resource allocation, allowing subsequent DCI messages to focus only on activation and scheduling decisions, thereby reducing control information complexity.
2Productivity
If multi-PDSCH scheduling is used for SPS activation, then resource utilization is improved, but latency in processing increases
Solution Approach 1:
The patent implements feedback mechanisms where the UE sends HARQ-ACK acknowledgments for each received downlink transmission carrying SPS activation information. This feedback loop enables the gNB to verify successful reception and adjust subsequent transmissions, optimizing resource utilization while managing processing latency through confirmed data delivery.
Solution Approach 2:
The patent employs periodic action through scheduled SPS transmissions occurring at predetermined intervals. Once SPS is activated through multi-PDSCH scheduling, data transmissions follow a periodic pattern, improving resource utilization by eliminating the need for continuous scheduling decisions while maintaining predictable latency characteristics.
3Reliability
If DAI counter procedures are implemented for HARQ-ACK feedback, then reliability of data transmission is improved, but device complexity increases
Solution Approach 1:
The patent segments HARQ-ACK feedback into multiple bits corresponding to different downlink transmissions. Each downlink PDSCH carrying part of the SPS activation information receives its own HARQ-ACK acknowledgment, ensuring reliable delivery of each segment while distributing the feedback processing load across multiple transmission occasions.
Solution Approach 2:
The patent introduces DAI (Downlink Assignment Index) counters as intermediaries that track and manage the sequence of downlink transmissions. These counters provide a systematic way to associate HARQ-ACK feedback bits with specific downlink transmissions, improving reliability through ordered acknowledgment while structuring the feedback process to reduce processing complexity.
Data Source
AI summary
A wireless device receives, from a base station, configuration parameters for semi-persistent scheduling (SPS) indicating a downlink control information (DCI) format for scheduling one or more PDSCHs via the first cell. The wireless device receives a DCI, based on the DCI format, indicating: a first field of the DCI format, a second field of the DCI format, a physical uplink control channel (PUCCH) resource, for receiving feedback information corresponding to a plurality of SPS PDSCH transmissions, and one or more resources for one or more PDSCHs. The wireless device determines that the DCI activates the SPS PDSCH based on the first field being set to a first predetermined value, the second field being set to a second predetermined value, and a number of the one or more PDSCHs being one.