Dynamic TTI Scheduling for Low Latency Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face increased complexity and power consumption when using multiple transmission time intervals (TTIs) for low latency communications, which can lead to higher latency and reduced efficiency in data transmission.
Innovation Solution
The implementation of dynamic TTI scheduling, where multiple TTI lengths are grouped together to share common configuration aspects, such as control channel formats, resource allocation granularity, and HARQ processes, to reduce complexity and enhance communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiple TTI lengths are used for low latency communications, then latency is reduced, but device complexity and power consumption increase
Solution Approach 1:
The patent segments TTI configurations by grouping multiple TTI lengths (e.g., 2-symbol, 4-symbol, 7-symbol) into distinct TTI groups, where each group shares common configuration aspects. This segmentation allows the system to use multiple TTI lengths for low latency communications while managing complexity through structured organization of configuration parameters.
Solution Approach 2:
The patent implements dynamic TTI scheduling that allows flexible selection and switching between different TTI lengths within groups based on traffic conditions and latency requirements. The base station can dynamically adjust TTI length, grouping configuration, and resource allocation to optimize performance while managing complexity adaptively rather than statically.
2Loss of time
If multiple TTI lengths are used for low latency communications, then latency is reduced, but power consumption increases
Solution Approach 1:
By segmenting TTI configurations into groups with shared parameters, the patent reduces the total number of configuration aspects that need to be monitored and processed. UEs can focus on specific TTI groups relevant to their service requirements, reducing power consumption while still benefiting from multiple TTI lengths for low latency when needed.
Solution Approach 2:
The patent changes key parameters including TTI length duration, grouping configuration, and resource allocation patterns to optimize the balance between latency reduction and power consumption. The system can adjust these parameters dynamically based on traffic conditions, using shorter TTIs only when low latency is required.
3Productivity
If dynamic TTI scheduling is implemented, then communication efficiency is improved, but computational intensity increases
Solution Approach 1:
The patent segments the scheduling complexity by organizing TTI configurations into groups with shared parameters. This segmentation allows the base station and UEs to process fewer unique configuration aspects, reducing computational intensity while maintaining the ability to implement dynamic scheduling for improved communication efficiency.
4Device complexity
If multiple TTI lengths are grouped together, then configuration complexity is reduced, but flexibility in resource allocation may be limited
Solution Approach 1:
The patent implements dynamic TTI scheduling that allows flexible selection and switching between different TTI lengths within groups based on traffic conditions and latency requirements. The base station can dynamically adjust TTI length, grouping configuration, and resource allocation to optimize performance while managing complexity adaptively rather than statically.
Data Source
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AI summary
Methods, systems, and devices for wireless communication are described. A wireless device may establish a configuration for at least one carrier based on multiple transmission time interval (TTI) lengths. Several TTI lengths may be associated in a TTI group, and aspects of the configuration may be the same for all TTIs having a TTI length in the TTI group. The device may then communicate using the carrier configuration based on the TTI group. In some cases, a second TTI group with different TTI lengths from the first group may also be identified, and the device may communicate using TTI from the second group using a different TTI group configuration. Aspects of a TTI group configuration may include a common control channel format, resource allocation granularity, hybrid automatic repeat request (HARQ) process, HARQ timing, soft buffer size, channel state information (CSI) reporting configuration, or an uplink control channel.