Answer Posted / sambit routray

WHEN THE MOBILE CHANGES ITS STATE FROM URA IDEAL MODE TO URA
CONNECTED MODE. RRC HAS FOUR STATES IN UTRAN.
1.CELL_DCH STATE
2.CELL_FACH STATE
3.CELL_PCH STSTE
4.URA_PCH STATE

THESE ARE MAINLY COMMON TRANSPORT CHANNEL TYPE SWITGHING,
DONE BY MAC, BUT UNDER THE SUPERVISION OF RRC.

CELL_FACH: IN THIS STATE UE IS KNOW ON CELL LEVEL AND UE
USES FACH TRANSPORT CHANNEL TO SEND DCCH AND CCCH INFO.
CELL_FACH IS THE ONLY STATE THAT CAN BE ENTERED FROM STATES
WITHOUT RESOURCES LIKE FROM IDEAL MODE, CELL_PCH, URA_PCH.

CELL_DCH; in this state ue is known on the cell level and
uses the dch transport channel. this state can entered from
cell_fach, cell_pch, ura_pch by setting up a dedicated channel.

CELL_PCH: IN THIS STATE UE IS ALSO KNOWN ON CELL LEVEL BUT
NO RESOURCES ARE USED BY THE UE. THE UE ONLY LISTEN TO
SYSTEM INFO. AND PAGGING INFO.IN THIS STATE THE RRC
CONNECTION IS MAINTAINED BUT TO EXANGE MSG BETWEEN UE AND
UTRAN A PAGGING AND A FOLLOWING TRANSITION CELL_FACH IS
REQUIRED.

URA_PCH: IN THIS STATE THE UTRAN KNOWS UE ON THE UTRA LEVEL.


THESE STATE TRANSITION ARE ONLY BASED UPON THE AMOUNT OF
DATA FLOW.

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