Single-DCI Scheduling for Multi-TTI Wireless Transmissions
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Solution Overview
Problem
Existing wireless communication networks face challenges in efficiently scheduling transmissions to meet the demands of low-latency, high-rate applications like eXtended Reality (XR) due to high signaling overhead and latency, particularly when channel conditions and traffic demands fluctuate.
Innovation Solution
A downlink control information message schedules multiple non-redundant transmissions across multiple transmission time intervals (TTIs) on both downlink and uplink serving cells, using a single DCI message to reduce signaling overhead and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiple transmissions are scheduled using separate DCI messages, then each transmission can be individually controlled, but signaling overhead and transmission latency increase
Solution Approach 1:
The patent combines multiple transmission scheduling operations into a single DCI message. The network device schedules multiple non-redundant transmissions (across different TTIs and/or serving cells) using one unified DCI message instead of separate DCI messages for each transmission, thereby reducing signaling overhead and transmission latency while maintaining individual control over each scheduled transmission through parameters within the single message
2Productivity
If single TTI scheduling is used, then scheduling can react quickly to changing channel conditions, but radio resource utilization is not maximized for sustained traffic demands
Solution Approach 1:
The patent applies preliminary action by scheduling multiple transmissions in advance through a single DCI message. The network device can allocate multiple TTIs and/or serving cells for future transmissions within one scheduling decision, allowing the system to proactively prepare for sustained traffic demands (such as XR applications) while maintaining the flexibility to adapt to changing channel conditions, thus improving radio resource utilization without sacrificing scheduling responsiveness
Data Source
AI summary
A wireless device (14) receives a downlink control information message (20) on a physical downlink control channel. In some embodiments, the downlink control information message (20) schedules two or more non-redundant downlink transmissions to be transmitted to the wireless device (14) in respective transmission time intervals, TTIs, on a first downlink serving cell (16A) and one or more non-redundant downlink transmissions to be transmitted to the wireless device (14) in one or more respective TTIs on a second downlink serving cell. In other embodiments, the downlink control information message (20) schedules one or more non-redundant uplink transmissions to be transmitted from the wireless device (14) in one or more respective TTIs on a first uplink serving cell (18A) and one or more non-redundant uplink transmissions to be transmitted from the wireless device (14) in one or more respective TTIs on a second uplink serving cell (18B).