Dynamic sTTI Downlink Signal Reception in Wireless Terminals
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing latency for packet data transmission, particularly in new radio access technology (NRAT) and long-term evolution (LTE), which affects downlink signal reception and transmission efficiency.
Innovation Solution
A method and apparatus for receiving downlink signals in a wireless communication system that dynamically changes the transmission scheme to support short transmission time intervals (TTIs), allowing for flexible configuration of TTI lengths and transmission modes, including transmit diversity, and enables reporting of terminal capabilities to support these changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed transmission scheme is used for downlink operation, then system complexity is reduced and ease of operation is improved, but adaptability to different latency requirements and transmission conditions deteriorates
Solution Approach 1:
The patent implements dynamic switching between different transmission schemes (sTTI-based and non-sTTI-based) based on real-time channel conditions and latency requirements. The base station dynamically selects and notifies the UE which transmission scheme to use through DCI signaling, allowing the system to adapt to varying transmission conditions while maintaining operational simplicity through automated control.
2Productivity
If short transmission time intervals (sTTI) are implemented to reduce latency, then data transmission speed is improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent segments the transmission time into different intervals (sTTI and non-sTTI) with distinct processing requirements. By dividing the transmission scheme into separable modes with clear switching mechanisms, the terminal can process only the necessary subset of operations based on the active transmission mode, reducing overall processing complexity while enabling high-speed transmission when sTTI is activated.
Solution Approach 2:
The patent maintains separate but parallel processing paths for sTTI-based and non-sTTI-based transmissions, with the terminal capable of copying and adapting existing processing algorithms to different TTI lengths. This allows the terminal to handle multiple transmission modes without requiring completely separate processing architectures, thereby managing complexity while supporting high-speed transmission.
3Adaptability or versatility
If multiple transmission modes are supported for different TTIs, then adaptability to various transmission conditions is improved, but system complexity and configuration overhead increase
Solution Approach 1:
The patent designs a universal transmission framework where a single downlink control information format can schedule both sTTI-based and non-sTTI-based transmissions. The DCI structure incorporates flexible fields that can indicate different transmission modes, allowing the same control mechanism to handle multiple transmission scenarios, thereby reducing configuration complexity while maintaining high adaptability.
Data Source
AI summary
A method for receiving a downlink signal in a wireless communication system according to an embodiment of the present invention is performed by a terminal, and may comprise the steps of: receiving, from a base station, a dynamic change configuration into a predetermined transmission scheme related to a short transmission time interval (sTTI)-based downlink operation; when the dynamic change configuration is received, detecting a downlink control information format including a field related to the dynamic change; and when a value of the field indicates the predetermined transmission scheme, receiving a signal on a downlink data channel according to the predetermined transmission scheme.