Base Station ABS Pattern Detection for Cell Selection
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Solution Overview
Problem
In wireless communication networks, especially in Heterogeneous Networks (HetNet), the almost blank subframe (ABS) technique leads to abnormal cell-selection behaviors due to erroneous Reference Signal Received Quality (RSRQ) measurements, resulting in incorrect handover decisions between base stations and user equipment.
Innovation Solution
A base station with a detection module to provide pattern information of the almost blank subframe and a measurement configuration adjustor to generate tailored parameter thresholds for cell-selection, allowing user equipment to perform accurate cell-selection based on specific broadcasting schedules and dedicated signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an almost blank subframe is used to reduce interference in HetNet, then co-channel interference between high-power and low-power base stations is reduced, but abnormal cell-selection behaviors occur due to erroneous RSRQ measurements
Solution Approach 1:
The patent changes the parameter threshold for cell-selection based on the detection of almost blank subframe patterns. When ABS patterns are detected, the base station adjusts the parameter threshold to compensate for the erroneous RSRQ measurements, thereby resolving the contradiction between reducing interference and maintaining measurement accuracy.
2Ease of operation
If the RSRQ measurement is used for cell-selection, then cell-selection decisions can be made based on signal quality, but the RSRQ becomes too optimistic in ABS regions leading to erroneous handover decisions
Solution Approach 1:
The base station detects the ABS pattern information and uses this feedback to adjust the parameter threshold for cell-selection. This feedback mechanism ensures that cell-selection decisions remain reliable even in the presence of ABS patterns that would otherwise cause optimistic RSRQ measurements and erroneous handovers.
3Device complexity
If a single parameter threshold is used for all user equipment, then the system is simple to operate, but user equipment in ABS regions makes erroneous handover decisions
Solution Approach 1:
The patent applies different parameter thresholds to different user equipment based on their location and the detected ABS patterns. Instead of using a single uniform threshold, the system configures local quality parameters specifically for equipment in ABS regions, thereby improving cell-selection accuracy without significantly increasing overall system complexity.
Data Source
AI summary
A base station and a method that reduce abnormal cell re-selection behaviors. The base station includes: a detection module having a pattern information detector that provides pattern information of an almost blank subframe, and a measurement configuration adjustor that provides a first parameter threshold for cell-selection and generates a second parameter threshold for cell-selection according to the pattern information; and a measurement configuration generating module having a measurement configuration schedule generator that generates a broadcasting schedule according to the pattern information, a system information broadcaster that transmits first schedule information to first user equipment when the first user equipment establishes connection to allow the first user equipment to receive the first parameter threshold according to the first schedule information and perform cell-selection, and a dedicated signal generator that generates a dedicated signal and transmits second schedule information to second user equipment when the second user equipment establishes connection.