Dynamic TTI Length Selection Based on Timing Advance
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Solution Overview
Problem
Current mobile communication systems face challenges in efficiently selecting a transmission time interval (TTI) length that balances latency reduction with system efficiency, particularly in varying environmental conditions and user distances from the base station, without compromising the cyclic prefix length and control overhead.
Innovation Solution
The system dynamically selects TTI lengths based on the timing advance value, which measures the distance between the user equipment and the base station, considering quality of service requirements and environmental factors to maintain efficient data transmission while adapting to changing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the TTI length is shortened to reduce transmission latency, then the feedback and forwarding speed is improved, but the ratio of useful data to overhead is reduced due to constant control information and cyclic prefix requirements
Solution Approach 1:
The patent implements dynamic TTI length selection that adapts to different transmission conditions. The system can switch between short TTI (for low latency requirements) and long TTI (for high efficiency requirements) based on service type, channel conditions, and timing advance values, making the TTI structure flexible rather than fixed
Solution Approach 2:
The patent changes the TTI length parameter based on timing advance values and service requirements. By adjusting this key parameter dynamically, the system optimizes the balance between latency and transmission efficiency for different scenarios without being constrained by a fixed TTI structure
2Loss of time
If the TTI length is shortened while keeping the cyclic prefix length constant, then the latency is reduced, but the data per TTI is reduced while the overhead remains unchanged
Solution Approach 1:
The system dynamically adjusts TTI length based on timing advance values, allowing short TTI to be used when latency is critical and long TTI when data throughput is prioritized, optimizing the quantity of data transmitted per TTI based on real-time conditions
3Speed
If the TTI length is shortened while keeping the control information amount constant, then the feedback speed is improved, but the ratio of useful data to overhead is reduced
Solution Approach 1:
The patent implements dynamic TTI length selection that adapts to different service requirements and channel conditions, allowing the system to optimize the balance between feedback speed and transmission efficiency by choosing appropriate TTI lengths for different scenarios
Solution Approach 2:
The system changes the TTI length parameter based on timing advance values and service types, enabling faster feedback when using short TTI for latency-sensitive services while maintaining higher transmission efficiency with long TTI for data-intensive services
4Device complexity
If a fixed TTI length is used for all users and channels, then the system complexity is reduced, but the adaptability to different transmission conditions and user requirements is limited
Solution Approach 1:
The patent implements dynamic TTI length selection that adapts to different transmission conditions, user requirements, and service types. The base station determines appropriate TTI lengths based on timing advance values and service characteristics, providing flexibility without requiring complex per-user configuration
Solution Approach 2:
The system uses a unified TTI length determination mechanism that serves multiple functions: supporting different service types (eMBB, uRLLC, mMTC), adapting to different channel conditions, and optimizing for different user distances from the base station, all through a single adaptive framework
Data Source
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AI summary
The present invention provides a method of determining a transmission time interval length to be used for communications between a user equipment device and a base station in response to a new service request, wherein the transmission time interval length is selected dependent on a timing advance value to be used by the user equipment device for communication with the base station.