3G Based Events

BY: M ISMAIL RAZA

Event Range Count Relation1 A-I Primary Pilot Channel

2 A-F Frequency

3 A-D Quality

4 A-B Channel Traffic Volume

5 A-A CRCs

6 A-G Rx-Tx

7 A-C Location / Position

RRC Reporting events or Handover events are sent from RBS or UE to trigger the different handover procedures in the RNC.The generation of handover events depend on the different RF parameters and thresholds.

Event 1A• A Primary CPICH (Primary Pilot Channel) enters the reporting range; addition of

a radio link.

Event 1B• A primary CPICH (Primary Pilot Channel) leaves the reporting range; removal of

a radio link.

Event 1C• A non-active primary CPICH (Primary Pilot Channel) becomes better than an

active primary CPICH; replacement of the worst cell in AS.

Event 1D

• Change of best cell

Primary Pilot Channel

Event 1E• A Primary CPICH (Primary Pilot Channel) becomes better than an absolute

threshold.

Event 1F• A primary CPICH (Primary Pilot Channel) becomes worse than an absolute

threshold

Event 1G• Change of best cell (TDD)

Event 1H

• Timeslot ISCP below a certain threshold (TDD)

Event 1I

• Timeslot ISCP above a certain threshold (TDD)

Primary Pilot Channel

Event 2A• Change of best frequencyEvent 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; handover to inter-frequency neighbors

Event 2C

Event 2D• The estimated quality of the currently used frequency is below a certain threshold;

start compressed mode to measure inter-frequency WCDMA or GSM neighbors.Event 2E• The estimated quality of a non-used frequency is below a certain threshold.

• The estimated quality of a non-used frequency is above a certain threshold

Event 2F• The estimated quality of the currently used frequency is above a certain threshold;

stop compressed mode & stop measure inter-frequency WCDMA or GSM neighbors

Frequency

Event 3A• The estimated quality of the currently used UTRAN frequency is below a certain

threshold and the estimated quality of the other system is above a certain threshold; handover to GSM neighbors

Event 3B• The estimated quality of other system is below a certain threshold

Event 3C

Event 3D

• Change of best cell in other system

• The estimated quality of other system is above a certain threshold

Quality

Event 4A

• Transport Channel Traffic Volume becomes larger than an absolute threshold

Event 4B

• Transport Channel Traffic Volume becomes smaller than an absolute threshold

Channel Traffic Volume

Event 5A

• A predefined number of bad CRCs is exceeded

CRCs

Event 6A• The UE Tx power becomes larger than an absolute threshold; start compressed

modeEvent 6B• The UE Tx power becomes less than an absolute threshold; stop compressed mode

Event 6C

Event 6D• The UE Tx power reaches its maximum value

Event 6E• The UE RSSI reaches the UE's dynamic receiver range

• The UE Tx power reaches its minimum value

Event 6F• The UE Rx-Tx time difference for a RL included in the active set becomes larger

than an absolute thresholdEvent 6G• The UE Rx-Tx time difference for a RL included in the active set becomes less

than an absolute threshold

Rx-Tx

Event 7A• The UE position changes more than an absolute threshold

Event 7B• SFN-SFN measurement changes more than an absolute threshold

Event 7C• GPS time and SFN time have drifted apart more than an absolute threshold

Location / Position

References• http://www.telecomsource.net/showthread.php?1441-

What-are-the-events-1a-1b-1c-etc

THE END