UE Measurements

Intra-frequency measurements: measurements on downlink physical channels at the same frequency as the active set. A measurement object corresponds to one cell.

Inter-frequency measurements: measurements on downlink physical channels at frequencies that differ from the frequency of the active set. A measurement object corresponds to one cell.

Inter-RAT measurements: measurements on downlink physical channels belonging to another radio access technology than UTRAN, e.g. GSM. A measurement object corresponds to one cell.

Traffic volume measurements: measurements on uplink traffic volume. A measurement object corresponds to one cell.

Quality measurements: Measurements of downlink quality parameters, e.g. downlink transport block error rate. A measurement object corresponds to one transport channel in case of BLER. A measurement object corresponds to one timeslot in case of SIR (TDD only).

UE-internal measurements: Measurements of UE transmission power and UE received signal level.

UE positioning measurements: Measurements of UE position.The UE supports a number of measurements running in parallel. The UE also supports that each measurement is controlled and reported independently of every other measurement.

What is Soft Handover Overhead? What is the typical value in UMTS network?

• Soft Handover Overhead is calculated in two ways. 1) Average Active Set Size – Total Traffic / Primary Traffic. 2) Secondary / Total Traffic
• Typical Values are like 1.7 (Avg Active Set Size) or 35% (Secondary / Total )

How to improve Soft Handover in UMTS Network?
How can we avoide to many Soft Handover attempts?

What is Hard Handover in UMTS? When will it happen?

· Hard Handover in UMTS is a break before make type Handover
· It can happen in the inter RNC boundaries where there is no Iur link.

This may Helpful to You

IRAT Handover Guide
Inter System Cell Reselection Optimization Guide
TEMS UMTS Dropped and Block Call Specification 

What is the typical event sequence of IRAT Handover from 3G to 2G

Simple IRAT Handover Flow

Event 2d –entering into compressed mode –measurement of 2G candidates – Event 3a –Verification of 2G resources

Handover from UTRAN Command from 3G RNC to UE

Download Complete UMTS CS Call Flow

What are the conditions you typically set to trigger IRAT handover?

RSCP and Ec/Io are used to trigger IRAT handover:

1.       RSCP ≤ -100dBm.

2.       Ec/Io ≤ -16dBm.

Find more document on IRAT
WCDMA IRAT Handover
Details on IRAT Parameter Optimization Document

What is a typical soft handover gain in your link budget?

•          CS-12.2k:      3dB (UL), 2dB (DL)
•          PS-64k:         1dB (UL), 0dB (DL)
•          PS-128k:       1dB (UL), 0dB (DL)
•          PS-384k:       1dB (UL), 0dB (DL)

Know more about 

How does Soft Handover Work?

WCDMA Soft Handover Procedure

Why is there soft handover gain?

Soft handover gain comes from the following:

• Macro diversity gain over slow fading.
• Micro diversity gain over fast fading.
• Downlink load sharing over multiple RF links.  By maintaining multiple links each link could transmit at a lower power, resulting in lower interference therefore a gain.

Just for you:

Download WCDMA IRAT Handover Document.

Download Documnet on GSM to WCDMA Handover

How many types of handovers are there in UMTS?

• Soft/Softer Handover
• Inter Frequency Handover
• Inter RAT Handover
• Core Network Hard Handover
• Service based handover to GSM
• HSDPA Mobility

Download UMTS Basic Understanding Document