Adaptive LBT Protocol Selection for LTE-U Hidden Node Resolution
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Solution Overview
Problem
The conventional LTE system operating in unlicensed spectrum faces challenges in efficiently sharing the wireless communication medium with other radio access technologies (RATs) due to the 'hidden node problem', where transmitters may not detect ongoing transmissions, leading to inefficiencies and performance degradation.
Innovation Solution
An adaptive Listen Before Talk (LBT) protocol selection method that determines whether to use transmitter-based LBT or receiver-aided LBT based on the correlation of sensing results between transmitters and receivers, allowing for dynamic adjustment of LBT mechanisms according to deployment scenarios to improve user and system throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If transmitter-based LBT protocol is used, then device complexity is reduced, but hidden node problems occur leading to reduced reliability
Solution Approach 1:
The patent implements dynamic LBT protocol selection that adapts between transmitter-based LBT and receiver-aided LBT based on real-time channel conditions and deployment scenarios. The system dynamically determines which protocol to use by evaluating correlation of sensing results, transforming the static protocol selection into a dynamic adaptive mechanism that resolves the contradiction between simplicity and reliability.
Solution Approach 2:
The patent changes the parameter of LBT protocol type based on sensing environment characteristics. By monitoring channel conditions and correlation metrics, the system switches between different LBT protocol parameters (transmitter-based vs. receiver-aided), allowing optimization of reliability without permanently increasing device complexity.
2Reliability
If receiver-aided LBT protocol is used, then hidden node issues are reduced improving reliability, but device complexity increases
Solution Approach 1:
The system dynamically selects receiver-aided LBT only when channel conditions indicate high correlation between transmitter and receiver sensing results. This dynamic activation ensures reliability improvement is achieved only when necessary, avoiding permanent complexity increase. The protocol selection is flexible and condition-dependent.
Solution Approach 2:
The receiver assists the transmitter in performing LBT by providing sensing results feedback. This self-service mechanism allows the receiver to contribute to medium access control, improving reliability through distributed sensing without requiring complete reconfiguration of the transmitter's LBT logic.
3Productivity
If adaptive LBT protocol selection is implemented, then system throughput is improved, but processing requirements increase
Solution Approach 1:
The patent implements feedback mechanisms where receivers report sensing results to transmitters. This feedback enables the transmitter to make informed decisions about protocol selection and channel access timing, improving system throughput through coordinated access while keeping processing requirements manageable through standardized feedback formats.
Solution Approach 2:
The patent replaces complex centralized control mechanisms with distributed sensing and decision-making. Each node independently evaluates channel conditions and selects appropriate LBT protocols based on local observations and received feedback, substituting mechanical centralized coordination with decentralized intelligent behavior that reduces overall system processing burden.
Data Source
AI summary
Embodiments of the present disclosure describe apparatuses and methods for determining a listen before talk (LBT) protocol to be used in a long term evolution unlicensed spectrum environment, wherein the LBT protocol is based at least in part on a transmitter-based LBT protocol or a receiver-aided LBT protocol. Other embodiments may be described and/or claimed.