Flexible Radio Frame Configuration for Wireless Terminal Devices
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Solution Overview
Problem
In LTE communication systems, the fixed 1 millisecond transmission time interval (TTI) limits data transmission efficiency, particularly when multiple physical resources are consecutively allocated, leading to deteriorated transmission efficiency due to the rigid time frame structure.
Innovation Solution
The introduction of a radio frame configuration with 10 millisecond frames, divided into half frames, sub frames, slots, and special sub frames, allowing for flexible allocation of downlink and uplink transmissions, and enabling efficient mapping of physical channels and signals across these frames.
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 transmission efficiency deteriorates when multiple physical resources are consecutively allocated
Solution Approach 1:
The patent segments the rigid 1 millisecond TTI into multiple flexible transmission time intervals (e.g., multiple slots or mini-slots within one TTI). This allows data transmission to be divided into smaller, more granular time units that can be consecutively allocated without being constrained by the fixed TTI boundary, thereby improving transmission efficiency while maintaining manageable system complexity
Solution Approach 2:
The patent introduces dynamic TTI configuration where the transmission time interval can be flexibly adjusted based on traffic conditions and resource allocation requirements. Instead of a fixed 1 millisecond TTI, the system can dynamically configure multiple TTIs or partial TTIs within the same time frame, enabling efficient consecutive resource allocation while adapting to varying system demands
2Loss of time
If multiple physical resources are consecutively allocated to reduce transmission time, then the latency is reduced, but the transmission efficiency of the entire system deteriorates due to the rigid TTI structure
Solution Approach 1:
The patent enables continuous data transmission by allowing multiple physical resources to be allocated across consecutive TTIs or within a single flexible TTI without interruption. The segmentation and dynamic configuration principles ensure that transmission can continue seamlessly across resource boundaries, reducing latency while maintaining high system efficiency through optimized resource utilization
3Adaptability or versatility
If the TTI is fixed at 1 millisecond, then the data transmission procedure is simplified and standardized, but the flexibility in scheduling and resource allocation is limited
Solution Approach 1:
The patent changes the time parameter from a fixed 1 millisecond TTI to a flexible configuration where multiple TTI lengths or partial TTIs can be used. This parameter change enables adaptive scheduling that can adjust to different traffic patterns and service requirements, providing enhanced scheduling flexibility while the underlying standardized framework maintains manageable system complexity
Data Source
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AI summary
[Object] To provide a terminal device capable of efficiently performing communication in a communication system in which a base station device and the terminal device communicate with each other. [Solution] A terminal device that communicates with a base station device includes: a higher layer processing unit configured to perform one or more second PDCCH settings through signaling of a higher layer from the base station device; a receiving unit configured to monitor only a common search space and a terminal device-specific search space in a first PDCCH in a case in which the second PDCCH setting is not performed, and monitor a terminal device-specific search space in at least a second PDCCH in a case in which the second PDCCH setting is performed. The first PDCCH is transmitted on a basis of a sub frame defined in accordance with a predetermined number of symbols. The second PDCCH is transmitted on a basis of an extended sub frame of a smaller number of symbols than a number of symbols corresponding to the sub frame, and a resource block set through the second PDCCH setting.