Uplink Collision Handling Between sTTI and TTI Transmissions
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Solution Overview
Problem
There is a challenge in handling collisions between shortened Transmission Time Interval (sTTI) and Transmission Time Interval (TTI) transmissions in Long Term Evolution (LTE) systems, where collisions can lead to interference and affect the decoding performance of uplink shared channels, particularly due to differences in numerology and overlapping resource allocations.
Innovation Solution
A method is introduced to manage collisions by determining whether to resume the transmission of uplink data blocks in sTTI and TTI, where the UE receives an indication to resume transmission after the completion of the sTTI transmission, allowing for efficient handling of collisions and minimizing interference by adjusting transmission based on the overlap and priority of resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sTTI and TTI transmissions are allowed to overlap in time to increase resource utilization, then productivity is improved, but decoding performance deteriorates due to collision and interference
Solution Approach 1:
The patent extracts the conflicting transmission by interrupting the sTTI transmission when a TTI transmission is detected in the overlapping region. The sTTI transmission is taken out or suspended from the overlapping time period to allow the TTI transmission to proceed without interference, thereby resolving the collision and improving decoding performance while maintaining overall resource utilization through selective transmission interruption
Solution Approach 2:
The patent implements dynamic transmission management by adjusting the sTTI transmission based on detected TTI transmissions. The system dynamically interrupts or suspends sTTI transmission in overlapping regions and may resume it after the TTI transmission completes, creating a flexible and adaptive collision handling mechanism that balances resource utilization with transmission reliability
2Reliability
If sTTI transmission is interrupted to allow TTI transmission, then decoding performance is improved, but loss of time increases due to transmission interruption
Solution Approach 1:
The patent applies the skipping principle by rapidly interrupting the sTTI transmission when a TTI collision is detected and resuming it as soon as the TTI transmission is complete. This minimizes the time the sTTI transmission is suspended, allowing the system to quickly skip through the collision handling process and resume normal operations, thereby reducing overall transmission delay while maintaining decoding performance
3Reliability
If collision handling mechanisms are implemented to manage sTTI and TTI transmissions, then decoding performance is improved, but device complexity increases
Solution Approach 1:
The patent implements a self-service collision handling mechanism where the UE autonomously detects TTI transmissions in overlapping regions and automatically interrupts or suspends its own sTTI transmission without requiring complex network coordination. This self-managed approach simplifies the overall system complexity while effectively resolving collisions and maintaining decoding performance
Data Source
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AI summary
For collision handling between shortened Transmission Time Interval (sTTI) and Transmission Time Interval (TTI) transmissions, a method determines a collision between user equipment (UE) uplink transmission resources in a first TTI 16 of a first TTI length and uplink transmission resources in a second TTI 16 of a second TTI length. The method further transmits a first uplink data transmission block (TB) in the first TTI and a second uplink data TB in the second TTI. The method interrupts the transmission of the first uplink data TB before transmission of the second uplink data TB. The method receives an indication that indicates whether to resume transmission of the first uplink data TB. The method determines to resume the transmission of the first uplink TB based on the indication.