Measurement Report Indication for Handover Reliability
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Solution Overview
Problem
In wireless communications, unpredictable sequences of inter-frequency measurements can lead to users being handed over to inferior radio frequencies or cells, resulting in frequent handovers and radio link failures, due to the inability of the serving network to accurately predict the user's radio conditions and mobility.
Innovation Solution
Incorporating a new indication in measurement reports that another measurement is in progress, allowing the network to wait for subsequent reports before making handover decisions, and prioritizing measurement identities to ensure the user is handed over to the best available cell or frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the network performs multiple inter-frequency measurements simultaneously without indication, then measurement coverage is improved, but handover decisions become unreliable due to unpredictable measurement sequences
Solution Approach 1:
The patent implements a feedback mechanism where the UE includes an indication in measurement reports to inform the network about ongoing measurements. This feedback loop allows the network to understand the current measurement state and adjust handover decisions accordingly, resolving the unreliability caused by unpredictable measurement sequences.
Solution Approach 2:
The patent applies preliminary action by having the UE evaluate measurement results against thresholds before reporting, and by including advance indications about ongoing measurements. This allows the network to prepare for potential handovers and avoid making decisions based on incomplete or sequential measurement data.
2Speed
If the network makes handover decisions based on available measurement reports, then response time is improved, but the risk of handover to inferior cells increases
Solution Approach 1:
The indication mechanism provides feedback to the network about the measurement state, enabling the network to distinguish between complete measurement reports and partial reports with ongoing measurements. This feedback allows the network to wait for additional reports when needed, balancing response time with handover quality.
Solution Approach 2:
The patent introduces dynamic behavior where the network's handover decision process adapts based on the measurement report contents. When an indication of ongoing measurement is received, the network dynamically adjusts its decision-making process, either waiting for more reports or prioritizing based on preliminary results, thus optimizing both speed and reliability.
3Productivity
If the UE reports measurement results immediately when criteria are met, then measurement efficiency is improved, but frequent handovers to inferior frequencies occur
Solution Approach 1:
The UE performs preliminary evaluation of measurement results against configured thresholds before generating reports. This preliminary action filters out premature or inferior measurement results, ensuring that only meaningful measurements trigger reports and thereby reducing frequent handovers to inferior frequencies.
Solution Approach 2:
The indication of ongoing measurements provides feedback to the network, allowing it to contextualize immediate reports. This feedback mechanism prevents the network from acting on potentially premature measurements by understanding whether additional measurements are still in progress, thus improving frequency stability.
Data Source
AI summary
Various aspects of the present disclosure relate to receiving a first message comprising a measurement configuration, where the measurement configuration comprises a plurality of measurement identities and determining, based on measurements associated with at least a first measurement identity in the plurality of measurement identities, that a measurement reporting criterion for at least one cell is satisfied. Aspects of the present disclosure relate to generating a measurement report based on the measurements associated with at least the first measurement identity and determining whether a radio quality of a respective cell satisfies a preliminary radio threshold. Aspects of the present disclosure relate to adding, to the measurement report, an indication that another measurement is in progress and the radio quality of the respective cell satisfies the preliminary radio threshold and transmitting a second message comprising the measurement report.