Wireless Device Mobility Measurement Reporting Mechanisms

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Solution Overview

Problem

In wireless communication networks, especially in 5G systems with high-frequency beamforming, existing mobility measurement reporting methods face challenges in maintaining link continuity and efficiency due to rapid link quality degradation and high latency issues, particularly when using RRC signaling for mobility decisions.

Innovation Solution

A method that employs a combination of RRC and physical layer radio link reporting mechanisms, where a wireless device performs mobility measurements and transmits first and second radio link measurement reports using different reporting mechanisms to ensure comprehensive reporting and rapid link establishment, enabling seamless handover even during rapid link quality loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If RRC signaling is used for mobility measurement reporting, then comprehensive measurement information can be conveyed reliably, but signaling overhead and latency increase significantly

Engineering Contradiction:

Improvemeasurement reporting reliabilityVSAvoidhandover latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent segments the mobility measurement reporting process into two distinct phases: (1) RRC-based measurement reporting for comprehensive information gathering, and (2) Physical layer (L1) reporting for rapid handover execution. This segmentation allows each mechanism to operate in its optimal performance regime, resolving the contradiction between comprehensive reporting and fast execution.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements preliminary action by having the UE perform and report mobility measurements using RRC signaling in advance, so that when handover is needed, the measurement information is already available. This preliminary measurement phase allows the actual handover to proceed quickly using pre-configured L1 reporting mechanisms, reducing overall latency.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If RRC signaling is used for mobility decisions in beam-formed systems, then reliable measurement reporting is achieved, but link quality degradation due to narrow beam coverage causes problems

Engineering Contradiction:

Improvemeasurement reporting reliabilityVSAvoidlink recovery time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent introduces dynamics by allowing the reporting mechanism to adapt based on radio link conditions. When the serving link quality deteriorates rapidly (as in narrow beam scenarios), the system dynamically switches from RRC-based reporting to faster L1-based reporting, enabling quicker response to link failures and faster recovery.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent prepares alternative reporting paths in advance by configuring both RRC and L1 reporting mechanisms. When narrow beam link quality degrades, the pre-configured L1 reporting path can be activated immediately without waiting for RRC reconfiguration, enabling rapid link recovery.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If continuous transmission of reference signals is applied in all individual transmission beams, then coverage is maintained, but resources available for data are consumed and interference in neighboring cells increases

Engineering Contradiction:

Improveradio link reliabilityVSAvoidinterference in neighboring cells

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces continuous reference signal transmission with periodic transmission. Instead of continuously broadcasting reference signals in all beams, the system transmits them periodically, which reduces overall resource consumption and interference while still maintaining the ability to perform mobility measurements and maintain link reliability.

Inventive Principle:

Principle #19Periodic action

4Reliability

If continuous transmission of reference signals is applied in all individual transmission beams, then coverage is maintained, but energy consumption in the radio access points increases

Engineering Contradiction:

Improveradio link reliabilityVSAvoidradio access point energy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by stationary object

Solution Approach 1:

The patent reduces energy consumption by transitioning from continuous to periodic reference signal transmission. The periodic transmission schedule ensures that reference signals are sent only when needed for mobility measurements, significantly reducing the energy burden on radio access points while maintaining sufficient coverage and link reliability.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentEP3520473B1Methods and arrangements for measurement based mobility

Publication Date: 2022.09.28 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

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AI summary

The present disclosure relates to methods and arrangements for performing wireless device assisted handover form a source access node to a target access node. Performed in a wireless device, the method comprises performing (S31) one or more mobility measurements for corresponding candidate radio links and transmitting (S33) a first radio link measurement report, comprising the mobility measurements for a recommended target link, using a first radio link reporting mechanism to the source access node. When communication over a target link is not initiated under a predetermined condition, the method comprises transmitting a second radio link measurement report, for the one or more candidate radio links, on the recommended target link using a second radio link reporting mechanism different from the first radio link reporting mechanism.