Cell Access Method Mitigating Lakeside Effect in Radio Networks
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Solution Overview
Problem
The 'lakeside effect' in radio communication technology, where uplink and downlink signals are inconsistent due to signal reflections over water, leading to failed access to base devices and deteriorated communication quality for terminal devices far from base stations.
Innovation Solution
A method for terminal devices to access cells by receiving system information with a cell resident risk identifier and measurement data, determining if the serving cell is prone to the lakeside effect, and initiating reselection or forbidding access when the effect is detected, ensuring successful connection and improved communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell reselection offset is configured to make uplink and downlink signals consistent, then access failure is reduced, but terminal devices are forced to select adjacent base devices causing communication quality deterioration
Solution Approach 1:
The patent applies preliminary action by having terminal devices detect and identify the lakeside effect before attempting cell access. The device determines whether it is subject to the lakeside effect based on signal characteristics, and only then decides whether to access the cell. This preliminary detection prevents unnecessary access attempts and avoids forcing terminal devices to select suboptimal adjacent cells, thereby maintaining both access reliability and communication quality.
2Area of stationary object
If terminal devices far from base devices access cells with strong downlink signals, then coverage is extended, but uplink feedback signals cannot reach the base device causing access failure
Solution Approach 1:
The patent applies feedback by having terminal devices monitor and detect signal characteristics to identify the lakeside effect condition. The terminal device uses this feedback information to determine whether it is subject to the lakeside effect and makes access decisions accordingly. This feedback mechanism enables terminal devices to recognize when they are in a situation where downlink signal strength does not correlate with uplink transmission capability, preventing access failures while maintaining extended coverage.
3Reliability
If cell reselection is forced to adjacent base devices, then uplink signal consistency is improved, but interference from the original base device deteriorates communication quality
Solution Approach 1:
The patent applies preliminary action by having terminal devices detect and identify the lakeside effect before attempting cell access. The device determines whether it is subject to the lakeside effect based on signal characteristics, and only then decides whether to access the cell. This preliminary detection prevents unnecessary access attempts and avoids forcing terminal devices to select suboptimal adjacent cells, thereby maintaining both access reliability and communication quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents failure in accessing base devices and enhances communication quality by determining and mitigating the lakeside effect before accessing the serving cell, allowing successful connections within coverage areas while preventing access outside these areas.
Implementation Method 1
Signals received and sent by the base devices arranged by water are influenced by atmosphere and a reflection of a water surface, so a relative strong reflection path is formed. When the reflection path is superposed with a direct path of the base device, a strong signal (hereinafter referred to as a superposed signal) may be formed
Data Source
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AI summary
The present disclosure provides a method for accessing a cell and a device for accessing a cell. The method for accessing a cell includes: receiving, by a terminal device, system information sent by a serving cell where the terminal device resides, wherein the system information comprises a cell resident risk identifier and measurement information; determining, based on the cell resident risk identifier, that the serving cell has a risk to be subjected to a lakeside effect, and detecting signal quality of the serving cell based on the measurement information; and determining whether the terminal device is subjected to the lakeside effect based on the detected signal quality, and accessing the serving cell when it is determined that the terminal device is not subjected to the lakeside effect. According to the method for accessing a cell, the terminal device determines, before accessing the serving cell, whether the terminal device is subjected to the lakeside effect, such that the terminal device within the coverage area of the serving cell accesses the base device successfully while the terminal device outside the coverage area of the serving cell which resides at the serving cell may be detected and prevented in time to access the serving cell, thereby to avoid the failure accessing to the base device of the terminal device caused by the lakeside effect.