BWP Switching Default Configuration Alignment

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Solution Overview

Problem

The misalignment between active bandwidth parts (BWP) and associated physical layer configurations in wireless network communications leads to suboptimal performance and erroneous behavior, particularly during BWP switching, as previously activated CSI-RS or SRS configurations may become invalid for the new active BWP.

Innovation Solution

The wireless device reverts to a default configuration for physical layer procedures upon receiving a BWP switching indication, either immediately or after a timer expires if no new MAC CE is received, ensuring that only valid reports are sent to the network, thereby preventing misalignment and maintaining optimal performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the UE maintains previously activated CSI-RS or SRS configurations during BWP switching, then the configuration complexity is reduced, but misalignment between active BWP and physical layer configurations occurs leading to erroneous behavior

Engineering Contradiction:

Improveconfiguration management complexityVSAvoidBWP-configuration alignment

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies preliminary action by resetting physical layer configuration to default state before new MAC CE commands are received after BWP switching. This ensures that the UE is in a known good state before reconfiguring, preventing misalignment issues while maintaining configuration management simplicity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of maintaining old configurations and updating them incrementally, the patent inverts the approach by resetting to default configuration after BWP switching. This reversal ensures alignment with the new active BWP while reducing the complexity of tracking and managing multiple configuration states.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If the UE resets to default physical layer configuration upon BWP switching, then alignment between active BWP and configurations is ensured, but additional signaling overhead and processing delay are introduced

Engineering Contradiction:

ImproveBWP-configuration alignmentVSAvoidconfiguration switching delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies self-service by having the UE autonomously reset its physical layer configuration to default when BWP switching occurs. This self-managed reset mechanism ensures alignment without requiring additional network signaling, thereby reducing time loss while maintaining reliability.

Inventive Principle:

Principle #25Self-service

3Productivity

If the UE sends physical layer reports based on previously activated configurations after BWP switching, then reporting continuity is maintained, but invalid reports are sent leading to suboptimal network performance

Engineering Contradiction:

Improvereporting continuityVSAvoidreport validity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies preliminary anti-action by preventing the UE from sending reports based on outdated configurations. By resetting the physical layer configuration to default before new MAC CE commands are received, the system avoids generating invalid reports that would compromise network performance, while still maintaining reporting continuity through proper reconfiguration.

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS11671231B2Bandwidth part switching and PHY configuration alignment

Publication Date: 2023.06.06 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

According to an aspect, a wireless device is configured to selectively operate in one of two or more previously configured bandwidth parts (BWPs), each BWP being a different subset of an available bandwidth for uplink and/or downlink operation. The wireless device receives an indication to switch from use of a first BWP to a second BWP, and after switching to use of the second BWP, applies a predetermined default configuration, corresponding to the second BWP, to one or more physical layer parameters and/or procedures.