Terminal TTI Adaptation for Efficient Consecutive Resource Allocation
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Solution Overview
Problem
In LTE systems, the fixed 1 millisecond TTI limits data transmission efficiency, particularly when multiple physical resources are consecutively allocated, leading to reduced overall system performance.
Innovation Solution
Introduce a flexible radio frame structure with variable subframe configurations, allowing for improved allocation of downlink and uplink transmissions, and incorporating enhanced physical channels and signals to optimize data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed 1 millisecond TTI is used for data transmission, then the transmission time interval is standardized and simple to manage, but the data transmission efficiency deteriorates when multiple physical resources are consecutively allocated
Solution Approach 1:
The patent applies dynamics by making the TTI length variable rather than fixed. The base station dynamically adjusts the TTI length (e.g., 1ms, 0.5ms, 0.25ms, or shorter) based on channel conditions and traffic requirements. This allows the system to optimize transmission efficiency for different scenarios while maintaining manageable complexity through centralized control at the base station.
Solution Approach 2:
The patent changes the parameter of TTI length from a fixed value (1ms) to a variable parameter that can be adjusted according to system needs. The base station configures different TTI lengths for different terminal devices or different resource allocations, enabling flexible optimization of transmission efficiency without requiring complete restructuring of the radio frame framework.
2Loss of time
If multiple physical resources are consecutively allocated to reduce transmission time, then the period of time necessary for data transmission is reduced, but the transmission efficiency of the entire system greatly deteriorates
Solution Approach 1:
The patent segments the radio frame into multiple configurable subframes with flexible TTI lengths. Instead of uniformly allocating resources across the entire frame, the system divides the frame into segments that can be independently configured with different TTI lengths based on traffic priorities and channel conditions, optimizing both latency and overall system efficiency.
Solution Approach 2:
The base station dynamically determines the TTI length for each resource allocation based on real-time channel conditions and traffic requirements. This dynamic adjustment allows the system to reduce transmission delay when needed while maintaining optimal system-wide transmission efficiency through adaptive resource management.
3Speed
If the TTI length is shortened to improve transmission efficiency, then the data transmission speed increases, but the complexity of managing physical resources and frame configurations increases
Solution Approach 1:
The system uses dynamic TTI length adjustment controlled by the base station to achieve high transmission speeds when needed. The base station manages the complexity of frame configurations by centrally determining and signaling the TTI length to terminal devices, eliminating the need for each device to independently manage complex frame structures while still achieving short TTI performance.
Solution Approach 2:
The patent changes the TTI length parameter dynamically based on transmission requirements. By adjusting this single key parameter, the system can achieve varying transmission speeds without requiring complex changes to the overall frame structure, simplifying management while maintaining flexibility for high-speed transmission when needed.
Data Source
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AI summary
A terminal device that communicates with a base station device, comprising: a control unit configured to set information related to a transmission time interval (TTI) based on signaling from the base station device; and a receiving unit configured to receive a first physical downlink shared channel (PDSCH) that is mapped in a first TTI mode or a PDSCH that is mapped in a second TTI mode and a demodulation reference signal, based on the information related to the TTI. The first TTI mode is a mode in which one PDSCH is mapped within a time resource defined by a predetermined number of symbols, and the second TTI mode is a mode in which two or more PDSCHs can be mapped in the time resource