UE Cell Mobility Feedback for RAN Optimization
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Solution Overview
Problem
Current technologies face challenges in observing and optimizing the movement of user equipment (UE) between cells, as the source and target radio access network nodes lack information about the UE's movement, making it difficult to track success rates and optimize network conditions.
Innovation Solution
The method involves user equipment (UE) transmitting a signal to a target radio access network node with cell mobility parameters, including source cell identification, source radio access technology, reason for cell change, and requested frequencies, allowing the target RAN node to store and use this information for future mobility decisions, and sharing this data with core network nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Release with Redirect mechanism is used to move UE between cells, then mobility between cells is enabled, but observability of success rate and optimization capability are lost
Solution Approach 1:
The patent implements feedback by having the UE send a message to the target RAN node containing mobility information (source cell ID, source RAT, reason for change). This feedback loop enables the target node to observe and record mobility events, allowing the network to track success rates and optimize redirection parameters based on actual performance data.
Solution Approach 2:
The patent introduces an intermediary message exchange between the UE and the target RAN node. This intermediary mechanism carries mobility information that would otherwise be lost, enabling observation and optimization without disrupting the existing Release with Redirect mobility mechanism.
2Speed
If Release with Redirect mechanism is used, then rapid UE movement between frequencies and RATs is achieved, but network optimization and tuning capability are reduced
Solution Approach 1:
The feedback mechanism collects data on UE mobility patterns, success rates, and failure reasons. This data enables network operators to optimize redirection parameters, frequency selections, and RAT preferences based on actual field performance, making network optimization easier and more effective while maintaining rapid UE movement capabilities.
3Adaptability or versatility
If Release with Redirect is implemented, then UE can move between different RATs, but ability to track and analyze mobility patterns is lost
Solution Approach 1:
The feedback message from the UE to the target RAN node provides precise mobility information including source cell ID, source RAT type, and reason for change. This enables accurate tracking and analysis of mobility patterns across different RATs, transforming the previously unobservable redirects into measurable events for network optimization.
Data Source
AI summary
A procedure is disclosed where a user equipment (UE) 10 can share information (with e.g. radio access network (RAN) nodes 20, 30) about its cell mobility attempts (e.g. redirection successes/failures). This information can subsequently be utilized by the various RAN nodes 20, 30 when making subsequent, i.e. future, cell mobility decisions. Hereby it is made possible to improve cell mobility decisions, such as redirection or handover, by the various RAN nodes 20, 30.