Dynamic TTI Reselection for Uplink Reliability
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Solution Overview
Problem
Current wireless communication systems face challenges in adapting quickly to changing uplink conditions due to the limitations of transmission time interval (TTI) selection, which can lead to inefficient data transmission, especially when mobile terminals move from central to edge areas or when initial TTI selection is based on inaccurate measurements.
Innovation Solution
A method and apparatus that allow for the reselection of a different TTI resource in response to detected failure conditions, such as changes in preamble power or unrecoverable errors, enabling adaptation to improve uplink data transmission efficiency by switching from a shorter TTI to a longer one or modifying transmission strategies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a shorter TTI (e.g., 2 ms) is selected to enable quicker adaptation to uplink conditions, then the responsiveness and data transmission speed are improved, but the coverage area and reliability for terminals at the edge of the coverage area deteriorate
Solution Approach 1:
The patent implements dynamic TTI switching that allows the system to adaptively change between different TTI configurations based on real-time uplink conditions. The mobile terminal can switch from a first TTI configuration to a second TTI configuration when movement or condition changes are detected, enabling the system to maintain optimal performance across varying scenarios including both speed-critical and reliability-critical situations
Solution Approach 2:
The patent changes the TTI parameter (transmission time interval duration) based on detected conditions such as mobile terminal movement and uplink quality metrics. By adjusting this critical parameter dynamically, the system optimizes the balance between transmission speed and reliability according to current operational requirements
2Productivity
If a shorter TTI is used to increase network capacity and bit rate, then productivity is improved, but the adaptability to changing conditions and coverage area edge performance worsen
Solution Approach 1:
The system dynamically adjusts TTI configuration based on detected conditions including mobile terminal movement and uplink quality changes. This dynamic adaptation enables the network to maintain high productivity when conditions permit while ensuring reliable operation when conditions change, thus achieving both high network capacity and adaptability
Solution Approach 2:
The patent implements feedback mechanisms that monitor uplink transmission conditions, mobile terminal movement, and transmission success/failure. This feedback information is used to trigger TTI reconfiguration, enabling the system to adapt to changing conditions while maintaining high network capacity through optimized resource utilization
3Measurement precision
If the mobile terminal moves from the central portion to the edge of the coverage area, then the initial TTI selection becomes inaccurate, but maintaining the original shorter TTI leads to transmission failures
Solution Approach 1:
The patent implements monitoring mechanisms that detect signs of TTI misconfiguration before transmission failures occur. By detecting mobile terminal movement and changes in uplink conditions, the system can proactively switch TTI configurations to prevent transmission failures, rather than waiting for failures to occur
Solution Approach 2:
The system continuously monitors uplink transmission conditions and mobile terminal status to provide feedback on the appropriateness of the current TTI configuration. This feedback enables corrective action to be taken when the mobile terminal moves to areas where the original TTI selection is no longer optimal, maintaining both measurement precision and transmission reliability
Data Source
AI summary
A method, apparatus and computer program product are provided in order to allow for reselection of a TTI resource, such as in an instance in which a mobile terminal has moved to a different portion of the coverage area and/or in an instance in which the TTI resource was initially incorrectly selected, such as based upon an inaccurate measurement. In the context of a method, a first TTI resource is selected in conjunction with an uplink. The method also detects a failure condition associated with the uplink and selects a second TTI resource, different than the first TTI resource, in response to detection of the failure condition.