Uplink Grant Scheduling for Short Transmission Time Intervals
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Solution Overview
Problem
Conventional wireless communication systems face challenges in improving the efficiency of radio resource utilization and facilitating flexible use of uplink time resources, particularly when using short transmission time intervals.
Innovation Solution
The method involves controlling downlink transmission of an uplink grant that identifies combinations of transmission time intervals and uplink reference signal transmissions to assist in the recovery of uplink data, allowing for efficient use of radio resources and flexible scheduling of uplink data transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If short transmission time intervals are used to reduce latency, then the transmission speed improves, but the efficiency of radio resource utilization deteriorates
Solution Approach 1:
The patent combines multiple short transmission time intervals into a single uplink grant that schedules multiple uplink data transmissions. This merging approach allows the system to utilize short TTI intervals for low latency while achieving better overall radio resource utilization by batching multiple transmissions under one grant, thus resolving the contradiction between speed and resource efficiency.
Solution Approach 2:
The patent employs preliminary action by providing control information in advance that indicates a set of predetermined combinations of transmission time intervals and reference signal transmissions. This allows the communication device to prepare and execute multiple uplink transmissions efficiently without requiring separate scheduling decisions for each short TTI, thereby improving both speed and resource utilization.
2Speed
If short transmission time intervals are used to reduce latency, then the transmission speed improves, but the control signaling overhead increases
Solution Approach 1:
The patent merges multiple uplink transmission schedules into a single uplink grant message. Instead of sending separate control signaling for each short TTI transmission, the system consolidates scheduling information for multiple transmissions into one grant, significantly reducing control signaling overhead while maintaining the low-latency benefits of short TTIs.
Solution Approach 2:
The uplink grant is designed with multi-functionality to serve multiple purposes: it schedules multiple uplink data transmissions across different time intervals, indicates reference signal configurations, and provides resource allocation information for several transmissions simultaneously. This universal approach reduces the need for multiple separate control messages.
3Adaptability or versatility
If flexible use of uplink time resources is implemented, then the adaptability improves, but the device complexity increases
Solution Approach 1:
The patent reduces device complexity by providing control information in advance that defines predetermined combinations of transmission time intervals and reference signal transmissions. The communication device can directly apply these pre-defined combinations without performing complex real-time scheduling decisions, thus achieving flexible uplink resource usage while keeping device complexity manageable.
Solution Approach 2:
The patent manages complexity by changing the parameter representation from individual per-TTI scheduling decisions to a set of predetermined combinations characterized by parameters such as the number of transmission time intervals and reference signal transmission patterns. This parameter transformation simplifies the scheduling complexity while maintaining adaptability.
Data Source
AI summary
A technique may include controlling downlink transmission of an uplink grant for one or more uplink data transmissions by a communication device. The uplink grant identifies one combination from a set of predetermined combinations of one or more transmission time intervals and one or more uplink reference signal transmissions, including at least one combination of two or more transmission time intervals and one or more uplink reference signal transmissions. The technique may also include using the one or more uplink reference signal transmissions of the identified combination to assist the recovery of data from the one or more uplink radio data transmissions by the communication device in the one or more transmission time intervals of the identified combination.