Dynamic TTI Adjustment for Wireless Terminal Processing
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Solution Overview
Problem
The shortening of transmission time intervals (TTIs) in wireless communication systems, such as in LTE and 5G networks, poses challenges in ensuring sufficient terminal processing time due to varying environmental and performance conditions, leading to difficulties in securing adequate processing time for terminal apparatuses, especially at shorter TTI lengths like one symbol.
Innovation Solution
The system dynamically sets the minimum unit of transmission time, including TTI or short TTI (sTTI), based on the terminal processing time and timing advance value, allowing the base station to adjust the sTTI length by comparing the terminal processing time with the timing advance value and ensuring the condition T UE + T ADV < a * sTTI is met, where a is a coefficient determined by the cyclic prefix type and communication configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the transmission time interval (TTI) is shortened to reduce communication delay, then the communication speed and real-time performance are improved, but the terminal processing time becomes insufficient
Solution Approach 1:
The patent applies dynamics by making the TTI length adjustable rather than fixed. The base station dynamically sets the TTI length based on terminal processing capabilities and communication conditions, allowing the system to adapt between shorter TTIs for speed-critical scenarios and longer TTIs for processing-critical scenarios, thus resolving the contradiction between communication speed and processing time
Solution Approach 2:
The patent changes the parameter of TTI length based on terminal processing time characteristics. By monitoring terminal processing capabilities and adjusting the TTI parameter accordingly, the system optimizes the balance between communication speed and processing time, preventing processing bottlenecks while maintaining low latency where possible
2Loss of time
If the TTI is shortened to less than 1 ms for low-delay communication, then real-time application performance is improved, but it becomes difficult to secure sufficient terminal processing time under various communication conditions
Solution Approach 1:
The system dynamically adjusts TTI length based on terminal processing capabilities and communication conditions. When terminal processing time is sufficient, shorter TTIs are used to minimize delay; when processing time is constrained, longer TTIs are used to guarantee reliable processing, thus dynamically balancing delay reduction with processing reliability
Solution Approach 2:
The base station receives feedback from terminals regarding their processing capabilities and uses this information to adjust TTI length. This feedback mechanism ensures that TTI settings are matched to actual terminal capabilities, maintaining reliable processing time guarantees while optimizing for low delay when possible
Data Source
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AI summary
[Object] To set a minimum unit of a transmission time in communication via wireless communication in a further preferred form in accordance with conditions. [Solution] An apparatus including: a communication unit that performs wireless communication; and a control unit that decides a minimum unit of a transmission time in communication via the wireless communication on a basis of a first processing time that is decided in accordance with a terminal apparatus and a second processing time that is decided in accordance with a communication environment.