Shortened TTI Scheduling Based on UE Capability Signaling
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently allocating resources and ensuring reliable Hybrid Automatic Repeat Request (HARQ) feedback for UEs supporting both standard and shortened transmission time intervals (TTIs) due to varying UE capabilities, leading to potential processing collisions and suboptimal scheduling.
Innovation Solution
UEs indicate their capabilities to process both standard and shortened TTIs, including constraints, separately or simultaneously, to the base station, allowing for efficient resource allocation and reliable HARQ feedback by generating an indicator representing these capabilities, which the base station uses to schedule component carriers accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a UE supports both standard and shortened TTIs, then the system can provide both low latency and normal latency services, but processing collisions may occur leading to suboptimal scheduling
Solution Approach 1:
The UE capability indication is segmented into separate fields: one indicating support for shortened TTI processing and another indicating support for standard TTI processing. This segmentation allows the base station to understand which processing types the UE can handle independently, preventing processing collisions by scheduling appropriate TTI types for each UE based on its capabilities.
2Productivity
If the base station allocates resources without considering UE processing capabilities, then resource allocation is simplified, but processing collisions occur leading to suboptimal scheduling
Solution Approach 1:
The UE provides feedback to the base station about its processing capabilities through capability indication messages. The base station uses this feedback information to make informed scheduling decisions, allocating resources in a way that matches UE capabilities. This feedback mechanism enables efficient scheduling while avoiding processing collisions, as the base station can configure UEs appropriately based on their indicated capabilities.
3Productivity
If the UE indicates detailed capability information, then the base station can optimize scheduling, but the signaling overhead increases
Solution Approach 1:
The capability indication extracts only the essential information needed for scheduling optimization: whether the UE can process shortened TTIs and whether it can process standard TTIs. By extracting only these critical capability bits rather than transmitting full detailed capability profiles, the system achieves efficient resource allocation while minimizing signaling overhead.
Data Source
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AI summary
Methods, systems, and devices for wireless communication are described for shortened transmission time interval (TTI) configuration based on user equipment (UE) capabilities. A UE may determine, for each of one or more supported bands or band combinations, a capability of the UE to process transmissions having a first transmission time interval (TTI) duration and a second TTI duration, the first TTI duration being shorter than the second TTI duration. The UE may transmit to a base station an indicator representing the capability for the each of the one or more supported bands or band combinations. The base station may receive the indicator, schedule a component carrier within a frequency band of a first supported band combination of the one or more supported band combinations based at least in part on the received indicator, and transmit information within the frequency band of the component carrier based on the scheduling.