LTE TDD Access Device Dynamic Subframe Configuration Control
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Solution Overview
Problem
In LTE TDD systems, data receiving errors occur when user terminals receive data in subframes that are dynamically configured for either uplink or downlink transmission, leading to inefficiencies and resource waste, especially when configuration periodicity switches between 5ms and 10ms.
Innovation Solution
An access device determines the distribution of downlink transmission time slots in a subframe based on the configuration periodicity of a wireless frame and generates control information to indicate this distribution, which is sent to user terminals to ensure accurate reception of downlink data, thereby reducing errors and optimizing resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic TDD configuration is used to adjust uplink-downlink allocation according to traffic requirements, then spectrum resource utilization is improved, but data receiving errors occur in user terminals when configuration periodicity switches between 5ms and 10ms
Solution Approach 1:
The patent applies preliminary action by notifying the user terminal of the downlink transmission time slot distribution in advance through control information carried in a subframe prior to the first subframe. This allows the terminal to prepare correctly before receiving data, preventing receiving errors that would otherwise occur during dynamic configuration transitions between 5ms and 10ms periodicities.
Solution Approach 2:
The patent introduces control information as an intermediary element that carries indication of the downlink transmission time slot distribution. This intermediary communicates the configuration state from the access device to the user terminal, enabling the terminal to correctly interpret the dynamic TDD configuration without direct observation of the switching mechanism, thereby maintaining reliable data reception during transitions.
2Adaptability or versatility
If subframe 6 is configured as a special subframe to switch transmission between uplink and downlink, then transmission flexibility is improved, but user terminals experience data receiving errors when the configuration changes dynamically
Solution Approach 1:
The patent implements feedback by providing control information that indicates the distribution of downlink transmission time slots to the user terminal. This feedback mechanism ensures the terminal has accurate knowledge of the current configuration state, allowing it to correctly receive data even when subframe 6 dynamically switches between special subframe and downlink subframe configurations.
Data Source
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AI summary
Disclosed are a method for transmission control, a related device and a communication system. The method for transmission control may comprise: an access device determining the distribution of time slots for downlink transmission in a first subframe of a first wireless frame, where, if the first wireless frame corresponds to a first matching period, then the first subframe is a special subframe, and if the first wireless frame corresponds to a second matching period, then the first subframe is a downlink subframe; and generating control information for use in indicating the determined distribution of time slots for downlink transmission in the first subframe; transmitting the first wireless frame to a user terminal, where a downlink control channel of the first subframe of the first wireless frame bears the control information, or where a subframe that comes before the first subframe in the wireless subframe bears the control information. The solution of embodiments of the present invention facilitates an improvement on cases of reception error when the user terminal is receiving data borne by a subframe that may either be a special subframe or a downlink subframe.