RRM Measurement in Unlicensed Bands via RSSI Segmentation
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Solution Overview
Problem
In wireless communication systems using unlicensed bands, interference from coexisting communication protocols hampers quality of service and mobility, especially due to contention-based channel access and the unpredictability of discovery reference signal transmission.
Innovation Solution
A method for performing radio resource management (RRM) measurements in unlicensed bands, involving setting up distinct measurement intervals for received signal strength indicator (RSSI) assessment during both transmission and non-transmission periods of unlicensed cells, to reduce interference and enhance channel utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RRM measurement is performed only during DRS transmission periods in unlicensed band, then measurement simplicity is maintained, but measurement accuracy deteriorates due to interference from other communication protocols
Solution Approach 1:
The measurement process is segmented into two distinct intervals: first measurement interval for measuring signal strength during DRS transmission, and second measurement interval for measuring interference during non-transmission periods. This segmentation allows separate characterization of desired signal and interfering signals, improving measurement accuracy while managing complexity through structured interval management.
2Productivity
If unlicensed band is used for LTE service, then data throughput is increased, but interference from coexisting protocols worsens quality of service
Solution Approach 1:
The system performs preliminary measurements during the second measurement interval (non-transmission period) to characterize interference conditions before actual data transmission. This preliminary characterization of the radio environment enables better transmission decisions and interference management, improving QoS reliability while maintaining high throughput benefits of unlicensed band operation.
Data Source
AI summary
Provided are a method and an apparatus for performing radio resource management (RRM) measurement in an unlicensed band. The apparatus sets a first measurement section and a second measurement section for the RRM measurement in the unlicensed band, and measures a received signal strength indicator (RSSI) during the first measurement section and the second measurement section.