Cell Selection Method Skipping Barred Cells in Radio Networks
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Solution Overview
Problem
Existing cell selection methods in radio access networks can cause delays during emergency calls, negatively impact battery life, and user experience due to unnecessary scanning of barred cells, which wastes resources and time.
Innovation Solution
A method and apparatus for cell selection that involves searching for cells on frequencies, checking if they are barred, and if so, performing a search on another frequency, thereby avoiding the setup of channels and reading of Master Information Blocks (MIBs) and System Information Blocks (SIBs) for barred cells, thus optimizing resource usage and reducing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE scans all RF channels and checks all cells including barred cells, then the cell selection process is thorough and ensures finding a suitable cell, but it causes delays during emergency calls and wastes battery life
Solution Approach 1:
The patent applies preliminary action by having the UE first determine whether a cell is barred before initiating the full cell selection process. The UE checks the barred cell list and identifies barred cells in advance, then skips the channel scanning and information block reading for those cells. This preliminary filtering action reduces overall cell selection time while maintaining reliability by ensuring only unbarred cells are considered for camping.
2Loss of information
If the UE performs full cell search procedures including channel scanning and MIB/SIB reading for all cells, then complete cell information is obtained, but it consumes excessive battery power and network resources
Solution Approach 1:
The patent applies the extraction principle by removing the unnecessary cell search operations for barred cells from the overall cell selection process. Instead of performing complete channel scanning and MIB/SIB reading for all cells, the UE extracts and excludes barred cells from consideration based on pre-determined barred cell lists. This selective extraction maintains essential cell information completeness for valid cells while significantly reducing battery power consumption.
3Adaptability or versatility
If the UE checks all cells including barred cells, then no potential cells are missed, but it wastes network resources and increases processing time
Solution Approach 1:
The patent applies preliminary action by pre-determining which cells are barred and excluding them from the cell selection process before full analysis. This preliminary identification and exclusion of barred cells maintains adaptability by still considering all potentially valid cells while significantly improving productivity through reduced processing time and wasted resources on obviously unsuitable cells.
Data Source
AI summary
A method for cell selection in a radio access network covering a geographical area divided into a plurality of cells, the method comprising: searching for a cell on a frequency; checking to see if the cell is a barred cell; and conditional on identifying the cell as a barred cell performing a search for a cell on another frequency.