LTE-A Base Station LBT Configuration for Unlicensed Band Interference
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Solution Overview
Problem
Existing LTE systems face inefficiencies in managing overhead when operating in unlicensed bands due to interference from neighboring communication nodes, leading to inefficient carrier sensing and resource utilization.
Innovation Solution
A method that dynamically adjusts the Listen Before Talk (LBT) configuration based on interference thresholds and neighboring node activity, including changing Carrier Sensing periods, Reserved Resource Periods, and Inter-System Measurement Gaps, to optimize data transmission in unlicensed bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carrier sensing is always performed in the unlicensed band, then interference from neighboring nodes can be detected, but resource utilization efficiency deteriorates due to excessive overhead and unnecessary sensing operations
Solution Approach 1:
The patent applies dynamics by making the carrier sensing operation adjustable rather than fixed. The base station dynamically changes the LBT configuration based on measured interference levels from neighboring nodes. When interference is high, carrier sensing is performed frequently; when interference is low, the sensing period is extended or reduced, optimizing resource utilization while maintaining reliable interference detection.
Solution Approach 2:
The patent changes the parameter of carrier sensing period based on interference conditions. The LBT configuration information includes parameters such as CS period, RRP period, and measurement gap configuration. These parameters are adjusted according to the measured interference level from neighboring communication nodes, allowing the system to adapt between reliable detection and efficient resource usage.
2Adaptability or versatility
If the LBT configuration is adjusted frequently to adapt to changing interference conditions, then adaptability improves, but system complexity increases due to continuous monitoring and configuration management
Solution Approach 1:
The patent implements feedback by having the base station measure interference from neighboring nodes and use this information to adjust LBT configuration. The system continuously monitors interference levels and feeds this information back into the configuration decision process, enabling adaptive behavior without requiring complex centralized control. The feedback loop operates at appropriate intervals to balance adaptability with system simplicity.
3Speed
If Carrier Sensing period is shortened to detect interference faster, then interference detection speed improves, but data transmission opportunities are reduced due to more frequent sensing interruptions
Solution Approach 1:
The patent changes the CS period parameter based on measured interference conditions. When interference from neighboring nodes is detected at high levels, the CS period is shortened to enable faster detection. When interference levels are low, the CS period is extended to reduce sensing interruptions and increase data transmission opportunities. This dynamic parameter adjustment resolves the contradiction between detection speed and transmission efficiency.
Data Source
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AI summary
One disclosure of the present specification provides a method by which a long term evolution advanced (LTE-A)-based base station transmits data on an unlicensed band. The method can comprise the steps of: setting, by the base station, a listen before talk (LBT) configuration for determining whether to transmit signals of other nodes before transmitting data on the unlicensed band; measuring, by the base station, interference due to signals from other nodes during a preset measurement period; comparing the detected interference and a preset threshold value; changing the LBT configuration according to the comparison; and transmitting the changed LBT configuration to a terminal.