Wireless Communication Apparatus Dynamic Short TTI Selection
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Solution Overview
Problem
In wireless communication systems, existing technologies face challenges in efficiently managing the coexistence of short transmission time intervals (TTIs) with existing TTIs, leading to increased hardware costs and resource wastage, as not all devices require low latency, and not all UEs can support the same short TTI lengths.
Innovation Solution
A wireless communication system that includes a base station and terminal apparatus capable of generating and notifying multiple lengths of short TTIs, allowing devices to select the optimum length for data transmission and reception, thereby optimizing resource allocation and reducing hardware requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a short transmission time interval is implemented to reduce latency, then system latency is reduced, but hardware costs increase and not all devices can support it
Solution Approach 1:
The patent implements dynamic TTI length selection where the system can switch between different TTI lengths (short and long) based on real-time requirements. The base station and terminal apparatus negotiate and select the appropriate TTI length through signaling, allowing the system to adapt between short TTI for low-latency applications and long TTI for other scenarios, thereby avoiding the need for all devices to support short TTI hardware permanently.
Solution Approach 2:
The patent changes the TTI length parameter dynamically based on service requirements. By introducing multiple TTI length options (e.g., different numbers of OFDM symbols) and allowing selection through signaling between base station and terminal, the system can adjust the TTI parameter to match latency requirements without requiring all devices to have fixed short TTI capability, thus reducing hardware costs while maintaining low latency when needed.
2Adaptability or versatility
If multiple short TTI lengths are supported to provide flexibility, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent segments the TTI length options into discrete levels (e.g., different numbers of OFDM symbols) and allows the system to select from these segmented options through signaling. Rather than requiring continuous or fine-grained TTI length adjustment, the segmented approach provides sufficient flexibility for different service requirements while keeping the implementation complexity manageable through a limited set of predefined options.
3Loss of time
If short TTI is implemented universally to reduce latency, then system latency is reduced, but resource wastage increases as not all devices require low latency
Solution Approach 1:
The patent applies local quality by allowing different TTI lengths to be used for different terminal apparatuses or different services based on their specific requirements. Instead of uniformly applying short TTI across the entire system, the base station and terminal apparatus negotiate the appropriate TTI length through signaling, so that only devices or services requiring low latency use short TTI, while others use longer TTI, thereby avoiding resource wastage while maintaining low latency where needed.
Data Source
AI summary
[Object] To provide a wireless communication apparatus capable of transmitting and receiving data in accordance with an optimum length of a short transmission time interval in a terminal apparatus among a plurality of lengths of a short transmission time interval at the time of transmission and reception of data at a short transmission time interval shorter than an existing transmission time interval.[Solution] Provided is a wireless communication apparatus including: a frame generation unit configured to generate a frame including a plurality of subframes; a transmission unit configured to transmit the generated frame to another communication apparatus; and a notification unit configured to notify of information regarding a plurality of lengths of a short transmission time interval which is a transmission time interval shorter than one subframe period in the subframe.