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Answer Posted / 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
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