Variable Length Transmission Time Intervals for Latency Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in dynamically adapting to varying data traffic needs, leading to increased latency and inefficiencies in resource allocation for user equipment (UEs) in multiple-access systems.
Innovation Solution
The implementation of variable length transmission time intervals (TTIs) allows for flexible and dynamic adjustment of TTI duration based on UE or system requirements, enabling UEs to receive grants indicative of TTI type and duration, which can change dynamically, allowing for reduced latency operations by optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If fixed length TTI is used, then system stability is maintained, but latency increases and adaptability to traffic needs deteriorates
Solution Approach 1:
The patent implements variable length TTI by dynamically adjusting the duration of TTI based on traffic conditions and UE requirements. The base station determines appropriate TTI lengths and conveys them to UEs through grants, allowing the system to adapt between short TTIs for low-latency traffic and long TTIs for efficient resource utilization, thus resolving the contradiction between latency reduction and adaptability.
2Adaptability or versatility
If variable length TTI is implemented, then adaptability to traffic needs improves, but device complexity increases
Solution Approach 1:
The patent changes the parameter of TTI duration from fixed to variable based on traffic conditions. The base station determines appropriate TTI lengths and conveys them to UEs through grants, allowing the system to adapt between short TTIs for low-latency traffic and long TTIs for efficient resource utilization without requiring complex UE-side decision-making logic.
3Productivity
If dynamic TTI adjustment is implemented, then resource allocation efficiency improves, but processing complexity increases
Solution Approach 1:
The base station performs preliminary determination of appropriate TTI lengths based on traffic conditions and conveys this information to UEs through grants before actual data transmission. This preliminary action simplifies UE processing as they only need to follow the pre-determined TTI configuration rather than making complex real-time decisions.
Data Source
AI summary
Methods, systems, and apparatuses for enabling and utilizing variable length transmission time intervals (TTI) are described. Latency for communications between base stations and user equipment (UEs) may be reduced by flexibly and dynamically adapting to data traffic needs. TTI for a given UE may be dynamically adjusted according to UE or system requirements and the configuration of uplink and downlink TTI. A base station may utilize dynamic grants to schedule resources within a system. A UE may receive a grant in a first portion of a variable TTI. The UE may determine a duration of the variable TTI based on the grant, and the UE may communicate accordingly. The UE may receive a subsequent grant in the variable TTI—either in the first portion or another portion—and may respond or alter its operation accordingly.