TDD Subframe Configuration for Interference-Free Common Information
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Solution Overview
Problem
In TDD communication systems, terminal devices with opposite information transmission directions in the same subframe interfere with each other, causing the receive end to fail in correctly receiving common information, which is essential for operating.
Innovation Solution
A subframe configuration method where a network device sends a subframe configuration message to terminal devices to ensure they transmit information in the same direction in specific subframes, allowing for interference-free common information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If subframe types are randomly configured for different terminal devices to support flexible service transmission, then service flexibility and adaptability are improved, but interference between terminal devices with opposite transmission directions increases, causing common information to be incorrectly received
Solution Approach 1:
The patent segments subframes into two categories: first subframes where all terminal devices transmit in the same direction (no interference) and second subframes where terminal devices may transmit in opposite directions (interference possible). This segmentation allows the system to maintain flexible service configuration while ensuring reliable common information transmission in the first subframes.
Solution Approach 2:
The patent applies different transmission direction constraints to different subframes. In first subframes, all terminal devices are constrained to transmit in the same direction to eliminate interference. In second subframes, terminal devices can have different transmission directions to support flexible services. This local quality differentiation resolves the contradiction between reliability and adaptability.
2Adaptability or versatility
If terminal devices are allowed to transmit in opposite directions in the same subframe to support diverse services, then system adaptability is improved, but harmful interference is generated that prevents correct reception of common information
Solution Approach 1:
The patent divides subframes into first subframes (same direction transmission for all devices) and second subframes (different direction transmission allowed). This segmentation isolates interference to specific subframes while maintaining service diversity, thereby reducing overall harmful interference while preserving adaptability.
Solution Approach 2:
The patent acknowledges that opposite-direction transmission causes interference but converts this harmful effect into a beneficial structure by designating specific subframes (second subframes) for such transmissions. This allows the system to maintain service diversity while controlling interference to acceptable levels through structured subframe configuration.
Data Source
AI summary
A method for communication between a base station and multiple terminal devices in a time division duplex (TDD) mode is disclosed. Prior to communicating with the multiple terminal devices by means of a plurality of frames, the base station performs semi-static configuration on a first group of subframes of the plurality of frames, by sending a system message to the multiple terminal devices, the system message carrying configuration information designating a first group of subframes in every frame of the plurality of frames as being of a first subframe type; for each frame in the plurality of frames, the base station sends downlink control information to a first terminal device of the multiple terminal devices, the downlink control information designating a second group of subframes in said each frame as being of a second subframe type.