LTE-U Measurement Gap Activation for Unlicensed Band Interference
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Solution Overview
Problem
In LTE-U systems, channel measurement and data transmission in unlicensed bands face inefficiencies due to interference from Wi-Fi devices, leading to reduced performance and increased power consumption, as existing methods assume regular CRS transmission by base stations, which is not feasible in unlicensed bands.
Innovation Solution
The method involves adaptive activation of measurement gaps, proximity-based measurement, and uplink signal-based measurement techniques, allowing UE to measure channel quality and transmit data efficiently by utilizing virtual uplink subframes and CSI-RS configuration, even in interference-heavy environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If base stations transmit regular CRS in unlicensed bands, then channel measurement can be performed, but interference from Wi-Fi devices reduces measurement accuracy and transmission performance
Solution Approach 1:
The patent implements dynamic adaptation of measurement procedures by allowing UE to perform channel measurements during uplink subframes when base stations are receiving rather than transmitting. This dynamic approach adjusts measurement timing based on actual channel conditions and base station operations, avoiding interference periods while capturing channel characteristics during less congested times.
Solution Approach 2:
The patent employs periodic channel measurements during specifically designated uplink subframes that occur at regular intervals. This periodic measurement strategy allows the system to periodically capture channel state information when interference is minimized, maintaining measurement accuracy while adapting to the periodic nature of TDD frame structures.
2Measurement precision
If UE performs frequent channel measurements in interference-heavy environments, then channel quality can be accurately determined, but power consumption increases
Solution Approach 1:
The patent applies partial measurement action by performing channel measurements only during specific uplink subframes rather than continuously or during all downlink subframes. This partial measurement approach provides sufficient channel quality information for scheduling decisions while significantly reducing the power consumption associated with frequent measurements in interference-heavy environments.
3Measurement precision
If measurement gaps are activated for unlicensed band measurement, then channel measurement can be performed, but resource utilization efficiency decreases
Solution Approach 1:
The patent inverts the conventional measurement approach by performing channel measurements during uplink subframes when base stations are traditionally receiving, rather than during downlink subframes when base stations transmit. This inversion allows measurements to occur during periods when the channel is less congested with downlink transmissions, improving resource utilization while maintaining measurement capability.
4Productivity
If LTE-U systems use unlicensed bands for data transmission, then network capacity increases, but interference from Wi-Fi devices reduces transmission performance
Solution Approach 1:
The patent changes the temporal parameters of communication by utilizing uplink subframes for channel measurements instead of conventional downlink subframes. This parameter change in measurement timing allows the system to operate in unlicensed bands with improved performance by avoiding peak interference periods, thereby maintaining network capacity benefits while reducing interference impact.
Data Source
AI summary
The present disclosure relates to a 5G or pre-5G communication system for supporting a higher data transmission rate after a 4G communication system such as LTE. In a wireless communication system of the present disclosure, a method for receiving, by a base station, a measurement result of a terminal includes: a process for allocating at least one of a plurality of measurement gaps, set for measuring a licensed band, for the measurement of an unlicensed band; a process for transmitting activation instruction information that instructs the activation of a measurement gap for the allocated unlicensed band measurement; and a process for receiving, from the terminal, a measurement result for the unlicensed band measured in the activated measurement gap by the terminal.