RSSI Measurement for Hidden Node Detection in LTE Unlicensed Bands
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Solution Overview
Problem
In LTE networks operating on unlicensed frequency bands, existing methods like RSRP and RSRQ measurements fail to directly reflect interference conditions among different operators or systems, leading to hidden node issues that cause demodulation errors and interference on terminals.
Innovation Solution
Implementing RSSI measurement and reporting configurations that allow terminals to detect and report interference conditions accurately, enabling the network to identify hidden nodes by processing RSSI sample values and removing RSRP from RSSI measurements to isolate interference sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RSRP and RSRQ measurements are used to monitor signal quality, then mobility management can be performed, but interference conditions from different operators and hidden nodes cannot be directly detected
Solution Approach 1:
The patent segments the RSSI measurement into two distinct components: RSRP (signal strength from serving cell) and interference power (signal strength from other operators/systems). By separating these measurements and reporting them independently, the system can simultaneously maintain mobility management functionality while enabling precise interference detection from hidden nodes and other operators.
2Ease of operation
If base stations perform LBT before downlink sending, then channel availability can be judged, but hidden node interference on terminal side cannot be detected
Solution Approach 1:
The patent implements a feedback mechanism where the terminal measures RSSI during downlink reception and reports the interference power back to the base station. This feedback loop enables the base station to detect hidden node interference that LBT cannot perceive, as the terminal experiences the actual interference condition when receiving signals. The reported interference power provides critical information about hidden nodes that the transmitting base station cannot directly observe.
Data Source
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AI summary
Provided are a method and device for detecting signal strength. The method comprises: receiving measurement configuration information and report configuration information about received signal strength indication (RSSI) measurement issued by a network side; conducting RSSI measurement according to the measurement configuration information to obtain an RSSI sample value; and according to the report configuration information, processing the RSSI sample value to obtain a report value of the RSSI measurement, and reporting the report value of the RSSI measurement to the network side.