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IRAT

The document discusses how inter-frequency handovers are triggered in 3G networks. The network sends a measurement control message instructing the mobile equipment to perform inter-frequency measurements and sets an event threshold. If the estimated quality of the currently used frequency falls below the threshold while a non-used frequency rises above it, or if another threshold condition is met, it can trigger a measurement report and potential handover to another frequency. The network then evaluates signal quality on the current and non-used frequencies and may propose a handover to a new frequency if the evaluation is positive.

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Arinze Okemefuna
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89 views1 page

IRAT

The document discusses how inter-frequency handovers are triggered in 3G networks. The network sends a measurement control message instructing the mobile equipment to perform inter-frequency measurements and sets an event threshold. If the estimated quality of the currently used frequency falls below the threshold while a non-used frequency rises above it, or if another threshold condition is met, it can trigger a measurement report and potential handover to another frequency. The network then evaluates signal quality on the current and non-used frequencies and may propose a handover to a new frequency if the evaluation is positive.

Uploaded by

Arinze Okemefuna
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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How inter-frequency Handover is triggered in 3G The network decides that inter frequency measurements need to be performed and sends

the MEASUREMENT CONTROL MESSAGE with Measurement type set to Inter-Frequency measurements. Generally it will set an Event as well along with the measurements. The following are list of Events that can trigger Measurement Report. y Event 2a: Change of Best Frequency y Event 2b: The estimated quality of the currently used frequency is below a certain threshold and the estimated quality of a non-used frequency is above a certain threshold y Event 2c: The estimated quality of a non-used frequency is above a certain threshold y Event 2d: The estimated quality of the currently used frequency is below a certain threshold y Event 2e: The estimated quality of a non-used frequency is below a certain threshold y Event 2f: The estimated quality of the currently used frequency is above a certain threshold The Inter-Frequency Handover Evaluation bases its decision on P-CPICH quality measures on the currently used frequency and on one or more nonused frequencies. If the evaluation result is positive, one cell on a non-used frequency is proposed to Inter-Frequency handover Execution. Inter-Frequency Handover is a hard handover where the UE is ordered by the network to tune to another frequency. This means that there will be small interruptions in the data flow to and from the UE.

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