Redcap UE Cell Search Database for Interference Avoidance
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Solution Overview
Problem
The coexistence of Redcap base stations and regular base stations poses challenges for Redcap UEs, including interference from neighboring regular base stations and reduced success and reliability of handovers.
Innovation Solution
A method where a Redcap UE searches for neighboring cells, stores this information, marks regular base station cells as 'barred' to avoid interference, and makes mobility decisions based on this database to improve handover success and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a Redcap UE searches for neighboring cells including regular base stations, then the UE can potentially find more cells for mobility, but the UE encounters stronger interference from neighboring regular base stations which do not support Redcap feature
Solution Approach 1:
The Redcap UE performs preliminary actions by storing search information of neighboring cells in a database before making mobility decisions. This allows the UE to pre-identify and mark barred cells (regular base stations) and barred frequencies, so that when mobility decisions are made, the UE can quickly reference the database to avoid interfering cells without having to evaluate each cell in real-time, thus resolving the contradiction between finding more mobility options and avoiding interference
Solution Approach 2:
The database acts as an intermediary between the cell search process and mobility decision-making. It stores and processes information about neighboring cells, marking them as barred or allowed, and provides this processed information to the mobility decision module. This intermediary structure allows the UE to systematically manage the trade-off between exploring more cells and avoiding interference from regular base stations
2Adaptability or versatility
If a Redcap UE selects a regular base station during mobility decisions, then the UE may have more cell options, but the success rate and reliability of handover are downgraded
Solution Approach 1:
The UE performs preliminary marking of barred cells and barred frequencies in the database before handover decisions are made. By pre-identifying regular base stations as barred cells, the UE ensures that these cells are excluded from mobility decisions, thereby maintaining handover reliability while still allowing selection from appropriate Redcap-capable cells
Solution Approach 2:
The database provides feedback information about which cells are suitable for handover by marking barred cells and barred frequencies. This feedback mechanism allows the UE to make informed mobility decisions by referencing the stored information about cell compatibility, ensuring that handover decisions are made only to cells that support Redcap feature and thus maintain high success rates
Data Source
AI summary
A communication network system includes a Redcap UE, at least one Redcap base station and at least one regular base station. The Redcap UE currently camping on a Redcap cell covered by a Redcap base station searches for regular neighboring cells covered by a regular base station in the surrounding. The related search information is stored as a database in the Redcap UE, wherein each detected regular neighboring cell is marked as a barred cell and/or the frequency associated with each barred cell is marked as a barred frequency. The Redcap UE performs mobility decisions and interference countermeasures based on the database, thereby improving the success rate and the reliability of handover.