Downlink Control Information Scheduling for Wireless Latency Reduction
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Solution Overview
Problem
The increasing number of user equipment (UEs) and the demand for higher data throughput in wireless communication systems pose challenges in efficiently transmitting and receiving data using limited radio resources, while also requiring reduced latency and support for new radio access technologies.
Innovation Solution
A method where a user equipment (UE) and a base station (BS) transmit and receive downlink signals by monitoring control information in subframes, allowing for efficient data transmission and reception based on detected or undetected control information, enabling flexible resource allocation and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of user equipment and data transmission demand increase, then data throughput requirement increases, but available radio resources remain limited
Solution Approach 1:
The patent combines multiple downlink control information (DCI) transmissions for different subframes into a single DCI message. This merging allows the base station to convey scheduling information for multiple future subframes simultaneously, increasing data throughput efficiency without requiring additional radio resources for each individual DCI transmission.
Solution Approach 2:
The patent implements preliminary scheduling by transmitting DCI that contains resource allocation information for future subframes before those subframes occur. This allows user equipment to prepare in advance for data reception, reducing latency and improving throughput by eliminating the need for separate scheduling transmissions for each subframe.
2Adaptability or versatility
If control information is transmitted in every subframe, then scheduling flexibility improves, but latency increases
Solution Approach 1:
Multiple subframe scheduling decisions are merged into a single DCI transmission. The base station can allocate resources for multiple future subframes in one control message, maintaining scheduling flexibility across multiple subframes while reducing the frequency of control transmissions, thereby reducing latency.
Solution Approach 2:
The patent enables dynamic resource allocation across multiple future subframes through a single DCI message. The scheduling information includes resource allocations that can be dynamically adjusted for different subframes, maintaining adaptability while reducing the time overhead associated with frequent control transmissions.
3Reliability
If monitoring is performed in every subframe, then control information detection reliability improves, but device complexity and power consumption increase
Solution Approach 1:
The user equipment receives preliminary scheduling information in advance through the combined DCI message. This allows the device to prepare reception parameters and resource allocations before the actual data transmission occurs, improving detection reliability while reducing the need for continuous monitoring in every subframe, thereby lowering device complexity and power consumption.
Data Source
AI summary
In a control region of a first subframe, first downlink control information (DCI) for a second subframe may be transmitted to a user equipment. The user equipment monitors DCI in a control region of the second subframe. The user equipment operates on the basis of the second DCI if the second DCI for the second subframe is detected in the control region of the second subframe, and can receive downlink data or transmit uplink data in a data area of the second subframe on the basis of the first DCI if the second DCI is not detected.