Multiple TTI Subframe Multiplexing for Wireless Latency Reduction
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Solution Overview
Problem
The 5G mobile communication system faces challenges in reducing delay to 1 ms or lower, especially with the introduction of massive MIMO systems and varying TTI lengths, which can lead to self-interference and increased response delay when different TTI subframes are multiplexed.
Innovation Solution
A method and apparatus for multiplexing signals using multiple TTI structures in a wireless communication system, where a first subframe of a shorter length and a second subframe of a longer length are multiplexed in an FDM mode, with specific time intervals not used for signal transmission in the second link direction if they differ from the first link direction, and these intervals are signaled through a downlink control channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If subframes corresponding to TTIs of different lengths are multiplexed in FDD mode, then service flexibility is improved, but self-interference and response delay occur
Solution Approach 1:
The patent extracts and removes the harmful self-interference components by configuring specific time intervals within subframes where signals in opposite link directions are not transmitted. This creates interference-free zones that eliminate the harmful effects while preserving the FDM multiplexing structure for service flexibility.
Solution Approach 2:
The patent applies local quality by creating specific time intervals with different transmission characteristics within the overall subframe structure. These localized intervals are configured to prevent self-interference while the rest of the subframe maintains FDM multiplexing for flexible service support.
2Adaptability or versatility
If subframes corresponding to TTIs of different lengths are multiplexed in FDD mode, then service flexibility is improved, but response delay increases
Solution Approach 1:
The patent segments the subframe structure into multiple time intervals, including downlink dedicated intervals, uplink dedicated intervals, and variable intervals. This segmentation allows for optimized resource allocation and reduced response delay by ensuring that signals can be transmitted and received within appropriately timed segments, while still supporting multiple TTI lengths for service flexibility.
3Stability of the object's composition
If TDD radio frame structure of LTE system is used, then system compatibility is improved, but delay reduction to 1 ms or lower becomes more difficult
Solution Approach 1:
The patent introduces dynamic configuration of time intervals within the TDD radio frame structure. By making the interval configurations flexible and adaptable rather than fixed, the system maintains compatibility with LTE TDD while enabling reduced delay through optimized resource allocation and shorter transmission time intervals where needed.
Data Source
AI summary
The document relates to a method for performing communication using multiple transmission time interval (TTI) structures in a wireless communication system. In this method, a terminal transmits and receives a signal through a resource region in which a first subframe corresponding to a TTI (short TTI) of a first length and a second subframe corresponding to a TTI (short TTI) of a second length longer than the first length are multiplexed in a frequency divisional multiplexing (FDM) manner, and when a second link direction of a signal transmitted through the second subframe in a specific time interval is different from a first link direction of a signal transmitted through the first subframe, the specific time interval of the second subframe is not used for signal transmission in the second link direction.