Dynamic TTI Bundling Management for Wireless Uplink Reliability
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Solution Overview
Problem
Current transmission time interval (TTI) bundling techniques in LTE wireless communication systems do not effectively manage transmission patterns, leading to transmission delays and wastage of wireless resources, particularly at cell boundaries, and fail to adapt to changing channel quality.
Innovation Solution
A method for managing TTI bundling in user equipment, which involves forming packets and selecting either a fixed or dynamic time interval for repeated transmission, allowing for flexible and adaptive retransmission strategies to enhance reliability and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TTI bundling is performed by repeatedly transmitting the same packet with default fixed times, then uplink coverage is improved and transmission reliability is enhanced, but transmission delay increases and wireless resources are wasted
Solution Approach 1:
The patent applies dynamics by transitioning from fixed TTI bundling to dynamic TTI bundling, where the time interval between repeated transmissions is adjusted based on channel quality indicators (CQI). When channel conditions are good, the time interval is reduced or transmissions are stopped early, minimizing delay. When channel conditions are poor, the time interval is extended or more repetitions are performed, ensuring reliability. This dynamic adaptation resolves the contradiction between reliability and transmission delay.
Solution Approach 2:
The patent changes the parameter of time interval duration from a fixed default value to a variable parameter that adapts based on channel quality measurements. By monitoring CQI and adjusting the TTI bundling time interval accordingly, the system optimizes the balance between transmission reliability (needing more repetitions in poor conditions) and transmission delay (needing fewer repetitions in good conditions).
2Ease of manufacture
If TTI bundling is performed with default fixed time intervals, then implementation is simple, but wireless resources are wasted due to inability to adapt to changing channel quality
Solution Approach 1:
The patent implements feedback mechanisms where the user equipment (UE) monitors channel quality indicators (CQI) and provides feedback to the network. Based on this feedback, the network adjusts the TTI bundling time interval dynamically. This feedback loop enables the system to adapt to changing channel conditions, preventing wireless resource waste while maintaining implementation feasibility through standardized feedback procedures.
Solution Approach 2:
The system transitions from static fixed time intervals to dynamic adaptive time intervals that respond to channel conditions. The dynamic adjustment is triggered by CQI measurements and feedback, allowing the system to optimize resource usage without requiring complex manual configuration or implementation changes.
3Device complexity
If fixed TTI bundling is used, then system complexity is low, but transmission accuracy and reliability deteriorate in varying channel conditions
Solution Approach 1:
The patent changes the TTI bundling time interval parameter from fixed to variable based on channel quality measurements. By adjusting this parameter dynamically according to CQI, the system maintains transmission accuracy in varying channel conditions without requiring complex changes to the overall system architecture or protocol stack.
Solution Approach 2:
The system performs self-adjustment of TTI bundling parameters based on autonomous CQI measurements made by the user equipment. The UE independently monitors channel conditions and triggers appropriate feedback, enabling the system to maintain transmission accuracy without requiring external manual intervention or complex centralized control mechanisms.
Data Source
AI summary
A method for managing transmission time interval bundling transmission in a user equipment of a wireless communication system includes forming a plurality of packets to be transmitted (402), and selecting a fixed time interval or a dynamic time interval for repeatedly transmitting each packet of the plurality of packets to a network end of the wireless communication system (404).