Wireless Communication Apparatus Short TTI Coexistence Control
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Solution Overview
Problem
In wireless communication systems, introducing a short transmission time interval (TTI) poses challenges in managing resources and ensuring effective data transmission and reception, particularly when coexisting with existing TTI, as it increases the number of resources needed and can lead to inefficiencies in hardware usage and latency management.
Innovation Solution
A wireless communication apparatus and method that includes a notification unit to inform terminal apparatuses of short TTI fields and information within control fields transmitted in subframes, allowing for efficient allocation and use of resources, enabling both existing and short TTI data transmissions to coexist effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If short TTI is introduced to reduce latency, then system latency is reduced, but the number of resources to be allocated increases making the control field shorter
Solution Approach 1:
The control field is segmented into two parts: a first control field transmitted in units of subframes for existing TTI, and a second control field transmitted in units of short TTIs for short TTI data. This segmentation allows each control field to be optimized for its specific TTI type, preventing the second control field from becoming excessively long while still providing necessary scheduling information for multiple terminal apparatuses.
2Productivity
If short TTI resources are allocated to all terminal apparatuses, then short TTI transmission is enabled, but terminal apparatuses that cannot process short TTI are adversely affected
Solution Approach 1:
Different quality levels of service are provided to different terminal apparatuses based on their capabilities. Terminal apparatuses capable of processing short TTI receive data in the second control field with short TTI resources, while terminal apparatuses that cannot process short TTI receive data only in the first control field with existing TTI resources. This local differentiation ensures that each terminal receives appropriate service according to its processing capabilities.
3Quantity of substance
If the control field is extended to allocate resources for short TTI, then resource allocation is improved, but the field length exceeds available resources
Solution Approach 1:
The control information is organized in two dimensions: the first control field operates in the subframe time dimension for existing TTI, while the second control field operates in the short TTI time dimension. This dimensional separation allows resource allocation for both TTI types without requiring a single excessively long control field, as each dimension handles its own scheduling independently.
Data Source
AI summary
[Object] To provide a wireless communication apparatus capable of causing transmission and reception of data at an existing transmission time interval and transmission and reception of data at a short transmission time interval shorter than an existing transmission time interval to coexist effectively.[Solution] Provided is a wireless communication apparatus including: a notification unit configured to notify of a short transmission time field in which data is transmitted at a short transmission time interval which is a transmission time interval shorter than one subframe period in a subframe, and notify of information regarding the short transmission time interval for another communication apparatus in a control field transmitted in units of subframes.