Multi-radio UE Channel Barring for Interference Management
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Solution Overview
Problem
Multi-radio user equipment (UE) faces challenges in handling network-triggered mobility from a channel that is not locally barred to a locally barred channel, leading to repeated redirections and communication degradation due to interfering activities across different radio access technologies (RATs).
Innovation Solution
The UE detects unusable channels due to interfering activities and adds them to a list of blocked channels, treats redirection messages as connection release commands, and locally bars channels to prevent repeated redirections to barred channels, thereby managing mobility and maintaining communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE follows network redirection messages to switch channels, then mobility and network control are improved, but the UE may be repeatedly redirected to barred channels causing communication degradation
Solution Approach 1:
The UE proactively identifies and bars channels that are likely to cause interference based on current radio activities before following network redirection. By preemptively blocking problematic channels, the UE prevents the harmful effect of being redirected to barred channels, thus resolving the contradiction between network-controlled mobility and communication reliability
Solution Approach 2:
The UE monitors its own radio activities and channel conditions, then uses this feedback to dynamically bar or unbar channels. This feedback mechanism allows the UE to adapt to changing interference conditions and avoid being redirected to channels that would degrade communication quality while maintaining network-controlled mobility
2Reliability
If the UE bars channels locally to avoid interference, then communication quality is improved, but the UE cannot access valid channels that are not actually interfered with
Solution Approach 1:
The UE applies channel barring selectively based on local interference conditions rather than globally barring all channels. Each channel is evaluated individually, and only channels with actual interference from concurrent radio activities are barred. This localized approach maintains communication quality while preserving access to valid non-interfered channels
Solution Approach 2:
The channel barring state is dynamic rather than static. The UE continuously monitors radio activities and adjusts channel barring status in real-time, unbaring channels when interference conditions change. This dynamic adaptation ensures that channels are only barred when necessary, maintaining both communication quality and channel access capability
3Adaptability or versatility
If the UE simultaneously communicates over multiple RANs, then service capability is improved, but interference between RATs causes channel unusability
Solution Approach 1:
Before initiating communication on a channel, the UE checks whether concurrent radio activities on other RATs will cause interference. By performing this preliminary check and proactively barring affected channels, the UE prevents interference-related failures while maintaining the ability to simultaneously communicate over multiple RANs on non-interfering channels
Data Source
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AI summary
Methods, apparatus, and computer program products for managing mobility in a multi-radio device are provided. One example method generally includes detecting that a first channel is not usable for communicating via a first radio access technology (RAT); receiving a message to redirect from a second channel to the first channel; determining the first channel is in a set of one or more blocked channels not usable for the first RAT; and in response to the determination, taking one or more actions. Another example method generally includes detecting that a first channel is not usable for communicating via a first RAT and providing an indication to a network that a user equipment (UE) no longer supports the first channel.