TDD Frame Structure for 5G Low Latency Communication
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Solution Overview
Problem
The legacy frame structure of 3GPP LTE wireless communication systems is unable to meet the low latency requirements of 5G technology, particularly for applications like real-time control and tactile internet, which necessitate data transmission latency of 1 ms or less.
Innovation Solution
A new time division duplex (TDD) frame structure is proposed, where a user equipment (UE) receives synchronization signals in specific subframes, performs channel estimation, and transmits uplink control information, while also receiving downlink control information and system information, with a guard period to minimize interference and support flexible data configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the legacy frame structure of 1 ms TTI is used, then the system maintains compatibility with existing LTE infrastructure, but it is unable to satisfy the 1 ms data requirement latency for 5G applications
Solution Approach 1:
The patent segments the traditional 1 ms TTI frame into multiple smaller subframes with different configurations. Each subframe can be independently configured for downlink or uplink transmission, enabling finer control over transmission timing and reducing overall latency while maintaining compatibility with the existing LTE frame structure through the use of familiar subframe units
Solution Approach 2:
The patent introduces dynamic TDD frame structures where the direction (downlink or uplink) of each subframe can be dynamically changed based on traffic requirements. This dynamic configuration allows the system to adapt to varying latency demands of different 5G applications while maintaining backward compatibility with LTE infrastructure
2Loss of time
If the TDD frame structure is configured to support low latency applications, then data transmission latency is reduced to meet 5G requirements, but the system must balance downlink and uplink resource allocation which complicates the frame structure
Solution Approach 1:
The patent incorporates preliminary configuration of TDD frame structures through higher-layer signaling that pre-defines subframe directions and configurations. This preliminary setup reduces the need for complex real-time adjustments while still enabling low latency performance by having the frame structure ready-optimized for specific traffic patterns before data transmission begins
Data Source
AI summary
A method for a terminal performing communication using a TDD frame in a wireless communication system may comprise the steps of: receiving a synchronization signal (SS) from one symbol of a first subframe of a TDD frame; and transmitting uplink control information via an uplink control zone comprising at least one last symbol in the first subframe.