Shortened TTI Scheduling for Ultra-Low Latency Wireless
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Solution Overview
Problem
Current wireless communication systems, particularly LTE, face challenges in achieving lower latency as demand for mobile broadband access increases, necessitating improvements in scheduling data communications within control channel resources.
Innovation Solution
The implementation of an ultra-low latency (ULL) wireless technology using a shorter transmission time interval (TTI) than traditional LTE, allowing for resource element-level or resource block-level multiplexing to coexist with legacy technologies, enabling the scheduling of data resources based on a second TTI within a control channel associated with a first TTI, thereby reducing communication latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If legacy LTE scheduling with 1ms TTI is used, then system compatibility and stability are maintained, but communication latency remains high
Solution Approach 1:
The patent segments the TTI structure into multiple shorter TTIs within the original 1ms subframe. Each shorter TTI can be independently scheduled and processed, enabling reduced latency communications while maintaining compatibility with legacy LTE infrastructure through the overall subframe structure.
Solution Approach 2:
The patent introduces dynamic TTI length adjustment capability, allowing the system to switch between legacy 1ms TTI and shorter TTI configurations based on service requirements. This dynamic adaptation enables low-latency communications when needed while maintaining compatibility with legacy systems during normal operation.
2Loss of time
If shorter TTI duration is implemented, then communication latency is reduced, but control channel resource overhead increases
Solution Approach 1:
The patent merges multiple control channels into a unified control resource structure. By consolidating control information for both legacy and shortened TTI transmissions into shared control resource pools, the system reduces overall control channel overhead while supporting multiple TTI configurations.
Solution Approach 2:
The control channel structure is designed with multi-functionality to handle both legacy 1ms TTI scheduling and shortened TTI scheduling using the same control resources. This universal control mechanism eliminates the need for separate dedicated control channels for each TTI type, reducing resource overhead.
3Speed
If shorter TTI is used for low latency, then data transmission speed improves, but processing complexity at UE increases
Solution Approach 1:
The patent applies local quality optimization by enabling UE to process only the relevant shorter TTI configurations needed for low-latency services, while maintaining support for legacy TTIs for other services. This selective processing approach reduces overall UE complexity compared to processing all possible TTI configurations.
Data Source
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AI summary
Various aspects described herein relate to receiving data at a user equipment (UE) in wireless communications. The UE monitors a control channel associated with first data resources of a first transmission time interval (TTI). Based on the monitoring, the UE can determine that the control channel schedules second data resources for the UE based on a second TTI. Accordingly, in response to such determination, the UE can process data received over the second data resources based on the second TTI, where a first duration of the first TTI is greater than a second duration of the second TTI.