Adaptive Frame Structure for Unlicensed Spectrum
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Solution Overview
Problem
Current wireless communication systems face challenges in meeting growing demand for mobile broadband access due to spectrum congestion, particularly when using licensed radio frequency spectrum, and require modifications to implement Long Term Evolution (LTE) in unlicensed radio frequency spectrum, which involves adapting frame formats and using listen before talk (LBT) procedures like clear channel assessment (CCA) to access unlicensed bands effectively.
Innovation Solution
The implementation of adaptive frame structures with variable radio frame durations (e.g., 2 ms, 5 ms, or 10 ms) for LTE systems in unlicensed radio frequency spectrum, allowing for dynamic configuration based on network conditions to optimize data communications and reduce interference, while ensuring compliance with regulatory requirements through clear channel assessment and radar detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed radio frame duration (10 ms) is used in licensed spectrum, then system simplicity is maintained, but spectrum congestion cannot be alleviated and network adaptability to varying traffic conditions deteriorates
Solution Approach 1:
The patent implements dynamic frame structure where the radio frame duration is no longer fixed at 10 ms but can be adaptively adjusted based on network conditions. The base station determines appropriate frame durations (e.g., 2 ms, 5 ms, or 10 ms) according to traffic load, channel quality, and interference conditions, allowing the system to dynamically respond to varying network demands while maintaining operational simplicity through standardized duration options.
Solution Approach 2:
The patent changes the parameter of radio frame duration from a fixed value to a variable parameter that can take multiple standardized values (2 ms, 5 ms, 10 ms). This parameter change enables the system to adapt to different network conditions by selecting appropriate frame durations, thereby improving network adaptability without requiring completely new frame structure designs.
2Quantity of substance
If unlicensed spectrum is used to alleviate congestion, then spectrum availability improves, but interference from other transmissions increases requiring LBT procedures
Solution Approach 1:
The patent implements Clear Channel Assessment (CCA) procedures that require the base station to perform preliminary channel sensing before initiating transmissions in unlicensed spectrum. By checking channel availability in advance and selecting appropriate frame structures based on channel conditions, the system prevents interference with other transmissions while maximizing spectrum utilization opportunities.
3Productivity
If adaptive frame structures with variable durations are implemented, then network efficiency improves, but system complexity and configuration difficulty increase
Solution Approach 1:
The patent implements dynamic frame structure adaptation where the base station autonomously determines appropriate radio frame durations based on real-time network conditions including traffic load, channel quality, and interference levels. This dynamic approach improves network efficiency by optimizing resource allocation without requiring complex manual configuration, as the system automatically adapts to changing conditions while maintaining standardized frame duration options.
4Speed
If shorter frame durations are used to increase responsiveness, then system responsiveness improves, but overhead proportion increases reducing effective data transmission time
Solution Approach 1:
The patent provides multiple standardized frame duration options (2 ms, 5 ms, 10 ms) that allow the system to select the most appropriate duration based on specific network conditions. For high-speed responsive applications, shorter durations (2 ms or 5 ms) can be selected to improve responsiveness, while for data-intensive applications with stable conditions, longer durations (10 ms) are chosen to maximize effective transmission time and reduce overhead proportion.
Data Source
AI summary
Certain aspects of the present disclosure relate to techniques for configuring an adaptive frame structure for wireless communications systems using unlicensed radio frequency spectrum. A base station (BS) may determine whether another device is transmitting on a channel in the unlicensed radio frequency spectrum or one or more other network conditions pertaining to the channel, determine a frame structure from a plurality of frame structures used for data communications based at least in part on the one or more network conditions, wherein each of the plurality of frame structures has a different frame duration, and communicate with a user equipment (UE) using the determined frame structure. A UE may determine a frame structure from a plurality of frame structures used for data communications, wherein each of the plurality of frame structures has a different frame duration, and communicate with a BS using the determined frame structure.