Multi-PDSCH Priority Indication in High Frequency Wireless Systems
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Solution Overview
Problem
Higher subcarrier spacing in wireless communication systems results in short slot durations, limiting the flexibility in configuring priority for physical downlink shared channels (PDSCHs) and requiring efficient scheduling to meet diverse reliability and latency requirements, while existing methods lack the ability to differentiate priority levels and optimize resource allocation effectively.
Innovation Solution
A method where a wireless transmit/receive unit (WTRU) receives downlink control information (DCI) with multi-PDSCH priority indications, determines priorities for each PDSCH transmission, and adjusts scheduling parameters such as repetition number, time location, demodulation reference signal (DMRS) pattern, and modulation and coding scheme (MCS) to differentiate high and low priority transmissions, enabling flexible priority configuration and efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher subcarrier spacing is used for high frequency communication, then slot duration is reduced and signaling overhead is reduced, but priority configuration flexibility for PDSCH is lost
Solution Approach 1:
The patent segments the priority indication into multiple bits (e.g., 2 bits for 4 priority levels) within the DCI, allowing each PDSCH to be individually assigned a priority level. This segmentation enables fine-grained priority control without requiring separate DCI messages for each PDSCH, thus resolving the contradiction between reduced signaling overhead and maintained priority configuration flexibility.
Solution Approach 2:
The patent introduces dynamic priority indication in the DCI that can be adjusted per PDSCH scheduling instance. The priority field in DCI can be dynamically configured to indicate different priority levels (e.g., 0, 1, 2, 3) for different PDSCHs, allowing the system to adapt to varying traffic requirements while maintaining efficient multi-PDSCH scheduling with higher SCS.
2Device complexity
If all scheduled PDSCHs share the same priority index and MCS, then signaling overhead is reduced, but ability to meet diverse reliability and latency requirements is lost
Solution Approach 1:
The patent applies local quality by allowing different priority levels and MCS values for different PDSCHs within the same DCI. Each PDSCH can be assigned a specific priority level (e.g., through a priority indicator field) and corresponding MCS, enabling high-priority traffic (e.g., URLLC) to receive more robust modulation and coding while low-priority traffic (e.g., eMBB) uses more efficient schemes, thus meeting diverse QoS requirements without excessive complexity.
Solution Approach 2:
The patent changes the parameter configuration by introducing separate priority indication and MCS indication fields in the DCI for multi-PDSCH scheduling. This allows the base station to independently adjust priority levels and MCS values for each scheduled PDSCH, enabling flexible adaptation to different reliability and latency requirements while maintaining a unified scheduling framework.
3Reliability
If multiple TRPs are used for PDSCH transmission, then time and frequency domain diversity gains are achieved, but scheduling complexity increases
Solution Approach 1:
The patent merges the scheduling of multiple PDSCHs from different TRPs into a single DCI message. The DCI contains priority indications and MCS values that apply to multiple PDSCHs scheduled across different TRPs, allowing the system to achieve time and frequency diversity through multi-TRP transmission while maintaining simplified unified scheduling control, thus resolving the contradiction between reliability improvement and scheduling complexity.
Data Source
AI summary
A method performed by a wireless transmit/receive unit (WTRU) may compromise: receiving a downlink control information, wherein the DCI includes a multi-PDSCH priority indication; determining a priority for each of a two or more PDSCHs transmissions based on the multi-PDSCH priority indication; determining one or more scheduling parameters for each of the two or more PDSCH transmissions based on the determined priority of each of the two or more PDSCH transmissions; and receiving each of the two or more PDSCH transmissions using the respective determined scheduling parameters. The method may further compromise associating a first scheduling parameter with a first priority and a second scheduling parameter with a second priority, wherein the first priority is a high priority and the second priority is a low priority.