Explain about RRC States in Umts
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Answer / lalatendu
When the mobile is in connected mode there r 4 RRC states.
(i)cell_pch ststes
(ii)cell_DCH states
(iii)ura_pch states
(iv)cell_fach states
| Is This Answer Correct ? | 112 Yes | 6 No |
Answer / srikanthraja
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
| Is This Answer Correct ? | 67 Yes | 7 No |
Answer / 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.
| Is This Answer Correct ? | 19 Yes | 5 No |
Answer / waseem
CELL_DCH state is characterised by:
A dedicated physical channel is allocated to the UE in
uplink and downlink.
The UE is known on cell level according to its current
active set.
Dedicated transport channels, downlink and uplink (TDD)
shared transport channels, and a combination of these
transport channels can be used by the UE.
CELL_FACH state is characterised by:
No dedicated physical channel is allocated to the UE.
The UE continuously monitors a FACH in the downlink.
The UE is assigned a default common or shared transport
channel in the uplink (e.g. RACH) that it can use anytime
according to the access procedure for that transport
channel.
The position of the UE is known by UTRAN on cell level
according to the cell where the UE last made a cell update.
In TDD mode, one or several USCH or DSCH transport channels
may have been established.
CELL_PCH state is characterised by:
No dedicated physical channel is allocated to the UE.
The UE selects a PCH with the algorithm, and uses DRX for
monitoring the selected PCH via an associated PICH.
No uplink activity is possible.
The position of the UE is known by UTRAN on cell level
according to the cell where the UE last made a cell update
in CELL_FACH state.
URA_PCH State is characterised by:
No dedicated channel is allocated to the UE.
The UE selects a PCH with the algorithm, and uses DRX for
monitoring the selected PCH via an associated PICH.
No uplink activity is possible.
The location of the UE is known on UTRAN Registration area
level according to the URA assigned to the UE during the
last URA update in CELL_FACH state.
| Is This Answer Correct ? | 3 Yes | 0 No |
Answer / joby joseph
There are 4 RRC CONNECTED MODE states,
1.Cell_DCH:
Possible to transfer large quantities of uplink and downlink data
Dedicated channels can be used for both CS and PS connections
HSDPA and HSUPA can be used for PS connections
UE and network resource requirement is relatively high
Soft handover possible for dedicated channels and HSUPA
Inter-system and inter-frequency handover possible
Radio access network uses U-RNTI, H-RNTI, E-RNTI to identify UE
Paging Type 2 messages without a DRX cycle are used for paging purposes
2.CELL_FACH:
Possible to transfer small quantities of uplink and downlink PS data
CS connections require transition to CELL_DCH
Release 7 of the 3GPP specifications introduces HSDPA for CELL_FACH
UE and network resource requirement relatively low
Cell re-selections completed when UE is mobile
Inter-system and inter-frequency handover possible
Radio access network uses U-RNTI and C-RNTI to identify UE
Paging Type 2 messages without a DRX cycle are used for paging purposes
3.CELL_PCH:
Uplink data transfer is not possible
Downlink MBMS and CBS data can be received
Paging Type 1 messages with a DRX cycle are used for paging purposes
Paging UE in CELL_PCH is more efficient than paging UE in RRC Idle mode
Transitions to CELL_FACH use the Cell Update procedure for more than one reason
The UE and network resource requirement is less than CELL_FACH
Cell reselections and cell updates completed when a UE is mobile
Inter-system and inter-frequency cell reselections possible
Radio access network uses U-RNTI to identify UE
4.URA_PCH:
Uplink data transfer is not possible
Downlink MBMS and CBS data can be received
Paging Type 1 messages with a DRX cycle are used for paging purposes
Paging UE in URA_PCH is less efficient than paging UE in CELL_PCH
Transitions to CELL_FACH use URA and Cell Update procedures for more than one reason
The UE and network resource requirement is potentially less than CELL_PCH
Cell reselections and URA updates completed when a UE is mobile
Inter-system and inter-frequency cell reselections possible
Radio access network uses U-RNTI to identify UE
| Is This Answer Correct ? | 4 Yes | 1 No |
Answer / sachin
@Answer 2 :
Some ques
1) how it will be decided that data is less or high ? when entering into cell_dch or cell_fach state.!!!
RLC buffer occupancy comes into later part of picture intially How it will be decided that UE should move into CELL_DCH or CELL_FACH ?
| Is This Answer Correct ? | 3 Yes | 1 No |
Answer / thiago marcengo
Actually I have a new question related to this subject. What are the theoretical and practical transitions between states on a PS call that goes idle?
(All states involved)
CELL_DCH > CELL_FACH > CELL_PCH > URA_PCH > IDLE
(CELL_PCH or URA_PCH)
CELL_DCH > CELL_FACH > CELL_PCH > IDLE
CELL_DCH > CELL_FACH > URA_PCH > IDLE
(No CELL_PCH or URA_PCH)
CELL_DCH > CELL_FACH > IDLE
(No CELL_FACH)
CELL_DCH > CELL_PCH > URA_PCH > IDLE
CELL_DCH > CELL_PCH > IDLE
CELL_DCH > URA_PCH > IDLE
Thaanks!
| Is This Answer Correct ? | 3 Yes | 2 No |
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