Unlicensed Spectrum Negotiation for Cellular Interference Reduction
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Solution Overview
Problem
The challenge in cellular communication systems is the interference between licensed and unlicensed spectra when using unlicensed spectra for data communication, which hinders efficient spectrum utilization and access efficiency.
Innovation Solution
A method and system that negotiate the use of unlicensed spectrum resources between base stations and terminals through configuration tables and mobility management entities to determine and allocate suitable unlicensed frequency bands, ensuring proper scheduling and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If unlicensed spectrum is used for data communication in cellular system, then spectrum utilization and access efficiency are improved, but interference between licensed and unlicensed spectra occurs
Solution Approach 1:
The patent applies preliminary action by performing LBT (Listen Before Talk) detection before transmitting data on unlicensed spectrum. The base station and terminal detect the channel status in advance, and only proceed with transmission if the channel is clear, thereby preventing interference with licensed spectrum operations.
Solution Approach 2:
The patent introduces negotiation mechanisms as intermediaries between licensed and unlicensed spectrum operations. The base station and terminal negotiate through messaging (mode request message, mode acknowledgement message) to coordinate spectrum usage, with the network device acting as a mediator to manage resource allocation and prevent interference.
2Productivity
If unlicensed spectrum is used for data communication, then access efficiency is improved, but scheduling complexity increases
Solution Approach 1:
The patent segments the spectrum resource management into distinct modes (licensed spectrum mode, unlicensed spectrum mode, and dual-mode). The terminal and base station negotiate to select one mode, breaking down the complex spectrum management problem into manageable segments with clear selection criteria and configuration tables.
Solution Approach 2:
The patent implements dynamic spectrum access where the terminal and base station negotiate in real-time to determine whether to use licensed or unlicensed spectrum based on current channel conditions and service requirements. The mode can be dynamically switched through negotiation, allowing flexible adaptation to changing conditions.
Data Source
AI summary
Embodiments of the present invention provide a method, a device, and a communications system for performing data communication by using an unlicensed spectrum. In an embodiment, a base station determines to use an unlicensed spectrum to perform data communication, and sends mode request information to a terminal. The terminal receives the mode request message sent by the base station and determines, according to a preset configuration table, whether to use the unlicensed spectrum to perform data communication. When determining to use the unlicensed spectrum to perform data communication, the terminal sends a mode acknowledgement message to the base station. The base station receives the mode acknowledgement information sent by the terminal, and the terminal performs data communication in a first unlicensed frequency band with the base station.