Base Station Preamble Interference Information Broadcasting
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently communicating and utilizing interference information, leading to suboptimal bandwidth usage and transmission control in multi-user environments.
Innovation Solution
Incorporating a preamble with pilot symbols that include interference information, transmitted by base stations to access terminals, allowing them to adjust transmission power and data rates based on recovered interference data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional wireless communication systems transmit data without incorporating interference information in preambles, then system structure remains simple, but bandwidth efficiency is suboptimal and transmission control is inadequate
Solution Approach 1:
The patent merges interference information with pilot symbols within the preamble structure. By combining the existing pilot symbols (used for channel estimation) with interference information carrying symbols, the system achieves efficient bandwidth utilization without requiring separate dedicated channels for interference communication, thus resolving the contradiction between productivity and device complexity
Solution Approach 2:
The preamble structure is given multiple functions: it continues to provide channel estimation through pilot symbols while simultaneously conveying interference information through modulated pilot symbols. This multi-functionality allows the system to improve transmission control and bandwidth efficiency without adding separate communication mechanisms, addressing the contradiction between productivity and complexity
2Productivity
If base stations do not transmit interference information to access terminals, then transmission control decisions are simplified, but transmission power and data rate adjustments cannot be optimized
Solution Approach 1:
The base station measures and prepares interference information in advance, then embeds it in the preamble before actual data transmission occurs. This preliminary action allows access terminals to receive interference information ahead of time, enabling them to optimize transmission power and data rates before the critical transmission moment, thus improving productivity without adding real-time control complexity
Solution Approach 2:
The system establishes a feedback mechanism where base stations transmit interference information to access terminals through the preamble, allowing terminals to adjust their transmission parameters based on actual interference conditions. This feedback loop enables optimized transmission control while the use of preambles keeps the complexity manageable by batching information transmission
3Reliability
If interference information is not communicated efficiently, then system operation remains simple, but interference-related issues increase and bandwidth usage becomes suboptimal
Solution Approach 1:
The patent combines interference information communication with the existing preamble and pilot symbol structure. By merging these functions, the system achieves reliable interference management without creating separate complex communication mechanisms, as the same pilot symbols serve both channel estimation and interference information conveyance purposes
Data Source
AI summary
Wireless communications methods and apparatus are described. A communications apparatus, e.g., a base station, measures interference information, e.g., other sector interference information. The communications apparatus generates a preamble which includes a plurality of pilot symbols and at least one of the pilot symbols includes interference information. In some embodiments, the preamble is part of a superframe structure, e.g., a recurring superframe structure, including the preamble and a plurality of frames, at least some of the frames used to convey traffic data. The communications apparatus transmits the preamble, thus broadcasting the interference information to access terminals in the vicinity. An access terminal receives the preamble including a plurality of pilot signals, at least one of the pilot signals including interference information. The access terminal recovers the interference information from the received preamble and controls signal transmission based on the recovered interference information.