Terminal TTI Management for SPS and Dynamic Scheduling
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Solution Overview
Problem
The existing LTE system faces challenges in managing different Transmission Time Intervals (TTIs) for Semi-Persistent Scheduling (SPS) and Dynamic Scheduling (DS), leading to inefficiencies and increased transmission delay when they operate under different TTI lengths, which affects system compatibility and resource utilization.
Innovation Solution
A data communication method and terminal configuration that allow for separate TTI management for SPS and DS by determining the specific time resources for each within a time unit, enabling communication at different TTIs without overlapping, thus ensuring compatibility with existing LTE systems and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a unified TTI is determined according to the service with minimum delay requirement, then transmission delay is reduced, but resources are wasted
Solution Approach 1:
The system dynamically adjusts TTI length based on service type and traffic conditions. Different TTIs are configured for different services: short TTI for delay-sensitive services and conventional TTI for other services, allowing optimal resource utilization while meeting diverse delay requirements
2Loss of time
If DS and SPS correspond to different TTIs, then transmission delay is reduced for short-delay services, but the existing working mechanism with SPS overridden by DS becomes inapplicable
Solution Approach 1:
The patent segments the time-frequency resource into distinct regions for SPS and DS transmissions. By allocating specific time resources to SPS and others to DS within a time unit, the system avoids resource conflicts and enables independent TTI management for each scheduling type, resolving the inapplicability of the override mechanism
Solution Approach 2:
Different TTI lengths are applied locally to different scheduling types: short TTI for SPS transmissions and conventional TTI for DS transmissions. This localized adaptation allows the system to optimize for short-delay services while maintaining compatibility with existing DS mechanisms
3Loss of time
If short TTI is used for transmission, then transmission delay is shortened, but control signaling overhead increases and spectrum efficiency decreases
Solution Approach 1:
The system dynamically selects TTI length based on service requirements and traffic conditions. Short TTI is used only for delay-sensitive services where it provides benefit, while conventional TTI is used for other services, thereby avoiding unnecessary control signaling overhead and maintaining spectrum efficiency
Data Source
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AI summary
The present invention discloses a data transmission method and a terminal. In the method, the terminal supports transmissions with different TTL The method comprises: a base station instructing the terminal to use, on the basis of a target time unit of a target carrier wave, a first TTI for transmitting first data for semi-persistent scheduling and a second TTI for transmitting a second data for dynamic scheduling; and determining, on the basis of respective positions in the target time unit of a first time resource occupied for transmitting semi-persistent scheduling and of a second time resource occupied for transmitting dynamic scheduling, to transmit at least one of the first data and the second data, thereby achieving dynamic scheduling and semi-persistent scheduling using different TTIs.