UE Mobility Reception Timer for Power-Saving Handover Reliability

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Solution Overview

Problem

Existing wireless communication systems face challenges in managing user equipment mobility and power saving, particularly in 5G NR networks, due to issues such as handover failures and latency in processing mobility commands, leading to inefficiencies in power consumption and network operations.

Innovation Solution

Implementing a mobility reception timer and adjusting BWP inactivity timers to allow user equipment to remain in an active downlink bandwidth part for additional time to monitor for mobility information, and providing UE assistance information to enhance mobility operations with reduced latency and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the BWP inactivity timer expires and UE switches to default DL BWP for power saving, then power consumption is reduced, but the UE may miss mobility information and handover commands leading to handover failures

Engineering Contradiction:

Improvepower consumptionVSAvoidhandover reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The network configures the UE with a mobility reception timer before the BWP inactivity timer expires. This preliminary timer ensures the UE remains in the active DL BWP long enough to receive mobility information and handover commands, preventing handover failures while still allowing power saving after mobility procedures complete

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts BWP switching behavior based on mobility conditions. The mobility reception timer is configured conditionally based on measurement reports and handover likelihood, allowing the UE to switch to power-saving mode when stable and remain active when handover is expected, optimizing both power consumption and handover reliability

Inventive Principle:

Principle #15Dynamics

2Use of energy by moving object

If the UE switches to default DL BWP quickly after BWP inactivity timer expires, then power saving is improved, but latency in processing mobility commands increases

Engineering Contradiction:

Improvepower savingVSAvoidmobility command processing latency

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The mobility reception timer is configured in advance based on expected handover timing and network processing requirements. This preliminary configuration ensures the UE maintains active BWP status for sufficient duration to receive and process mobility commands without unnecessary delay, while still enabling power saving once the timer expires

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20260012871A1Mobility enhancements and power saving for user equipment communication

Publication Date: 2026.01.08 QUALCOMM INC

AI summary

Mobility enhancements and power saving considerations for UE are described. An apparatus performs a measurement of at least one of a source node or a target node, and transmits UAI associated with power saving, coverage enhancement, reliability enhancement, measurements, sensing, channel sounding, a dedicated PRACH resource, and preferred configurations for a beam, a TRP, or a cell in the target node based on at least one of a condition associated with a first measurement of the source node being below a first signal quality threshold or a second measurement of the target node being above a second signal quality threshold. Another apparatus configures a UE to provide the UAI, and receives the UAI based on the configuration.