Terminal Camping Cell Selection Licensed Unlicensed Bands
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Solution Overview
Problem
Current wireless cellular systems face challenges in optimizing terminal equipment access performance between licensed and unlicensed frequency bands, with unlicensed frequency bands primarily serving as supplements and experiencing limitations in access time and resource utilization due to competition mechanisms and interference.
Innovation Solution
A method and device for selecting a camping cell that measures licensed and unlicensed frequency bands using configuration information including channel signal quality and interference level metrics, such as RSRP, RSRQ, and RSSI, to determine optimal camping cells, allowing terminals to flexibly switch between bands for improved access performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If terminal camps in unlicensed frequency band cell, then resource utilization is improved, but access performance deteriorates due to LBT mechanism and competition
Solution Approach 1:
The patent implements dynamic camping cell selection by enabling the terminal to flexibly switch between licensed and unlicensed frequency bands based on real-time channel conditions. The terminal measures channel quality metrics (RSRP, RSRQ, RSSI) and dynamically determines whether to camp in licensed or unlicensed cells, optimizing the balance between resource utilization and access performance according to current network conditions.
2Reliability
If terminal uses LBT mechanism for unlicensed band access, then channel competition is resolved, but time delay increases
Solution Approach 1:
The patent applies preliminary action by having the terminal perform channel measurements and camping decisions before actual data transmission. The terminal proactively measures channel quality metrics (RSRP, RSRQ, RSSI) and determines the optimal camping cell in advance, so that when data transmission is needed, the terminal can immediately start without undergoing time-consuming LBT procedures, thus reducing time delay while maintaining channel access fairness.
3Reliability
If terminal camps in licensed frequency band cell, then access performance is ensured, but resource utilization is limited
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the camping cell selection based on measured channel quality parameters. The terminal continuously monitors RSRP, RSRQ, and RSSI values and changes its camping decision based on these parameter thresholds. When unlicensed band conditions are favorable (high RSRP, low RSSI), the terminal switches to unlicensed cells to improve resource utilization; when conditions deteriorate, it returns to licensed cells to ensure access performance.
4Measurement precision
If terminal measures multiple frequency bands, then camping decision accuracy is improved, but measurement complexity increases
Solution Approach 1:
The patent applies local quality by measuring and evaluating specific local characteristics of different frequency bands (licensed and unlicensed) rather than performing comprehensive global analysis. The terminal focuses on measuring key local parameters (RSRP for signal strength, RSRQ for signal quality, RSSI for interference level) in the immediate camping area, which provides sufficient accuracy for camping decisions without requiring complex-wide spectrum analysis.
Data Source
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AI summary
The invention provides a method for cell selection and reselection for a camping cell and a device utilizing the same. The method comprises: a terminal device performs, according to configuration information, measurements on a licensed band and an unlicensed band, wherein the configuration information comprises signal quality measurement configuration and/or interference level measurement configuration, the signal quality measurement configuration comprises a reference signal received power (RSRP) measurement configuration and/or a reference signal received quality (RSRQ) measurement configuration, and the interference level measurement configuration comprises a received signal strength indicator (RSSI) measurement configuration; and the terminal device determines, according to measurement results with respect to the measurements on the licensed band and the unlicensed band, a cell to be camped on. Therefore, a terminal device can camp on a cell covering a licensed or unlicensed band, providing favorable access performance among licensed or unlicensed bands.