There are four RRC states present in UMTS .

1.CELL_DCH STATE

2.CELL_FACH STATE

3.CELL_PCH STSTE

4.URA_PCH STATE

WHEN MOBILE IS MOVING FROM IDLE MODE TO DEDICATED MODE AND

DATA TRANMISSION IS OF LARGE AMOUNT OF DATA THEN CELL_DCH

STATE COMES IN TO PICTURE .

IF DATA TRANSMISSION IS OF SMALL AMOUT OF DATA THEN

CELL_FACH STATE WILL COME IN TO PICTURE

WHEN MOBILE IS MOVING FROM ONE CELL TO ANOTHER CELL IT

SHOULD PERFORM HANDOVER THEN MOBILE RRC STATE WILL BE IN

CELL_PCH STATE.

URA MEANS UTRAN REGISTRATION AREA

THE AREA COVERED BY ONE RNC IS KNOWN AS URA

SO WHEN MOBILE IS MOVING FROM URA AREA TO ANOTHER URA AREA

THEN LOCATION UPDATION SHOULD PERFORM THEN MOBLIE RRC STATE

COMES TO URA_PCH STATE .

THESE ARE THE FOUR RRC STATES PRESENT IN UMTS NETWORK