RFUE WCDMA/UMTS Timers Explained
wcdma
umts
timer
ue
mobile communication
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This tutorial section on UMTS basics covers the following sub topics:
- Main Page
- Architecture
- Stack channel types
- Bands
- UARFCN
- Frame
- Timers
This page covers timers used in 3G/WCDMA/UMTS compatible UE which include T300, T302, T304, T305, T307, T308, T309, T310, T311, T312, T313, T314, T315 and T316 timers.
| WCDMA/UMTS Timer | Function | When Start/Stop/at expiry |
|---|---|---|
| T300 | Starts at the transmission of RRC CONNECTION REQ | Stops at the receipt of RRC Connection setup. At expiry, re-transmits RRC CONNECTION REQ if V300<=N300, ELSE go to IDLE Mode |
| T302 | Starts at the transmission of Cell Update or URA Update | Stops at the receipt of Cell Update Confirm or URA Update Confirm. At expiry, re-transmits Cell Update/URA Update if V302<= N302 Else goto IDLE Mode |
| T304 | Starts at the transmission of UE Capability Info | Stops at the receipt of UE capability Information Confirm. At Expiry, re-transmits UE capability information if V304<=N304, Else initiate a Cell Update proc |
| T305 | Starts upon entering CELL_FACH/URA_PCH/CELL_PCH state OR upon receipt of CELL Update Confirm/URA Update Confirm | Stops upon entering another state. At expiry, transmits CELL Update if T307 is not activated and UE detects “In Service Area”. Otherwise If T307 is not active, initiate starting of timer T307 |
| T307 | Starts when timer T305 has been expired and UE detects the ” Out of Service Area” | Stops when UE detects “In Service Area”. At Expiry it transit to the IDLE MODE |
| T308 | Starts at the transmission of RRC Connection Release Complete | Not Stopped. At Expiry, transmits RRC connection Release Complete IF V308<=N308 ELSE GOTO IDLE MODE |
| T309 | Starts upon receipt of Cell Change Order from UTRAN message | Stops upon successful response to a CONNECTION ESTABLISHMENT REQUEST in a new CELL. At Expiry, resumes the Connection to UTRAN network |
| T310 | Starts upon transmission of PUSCH Capacity Request message | Stops upon receipt of Physical Shared Channel Allocation. At expiry transmits PUSCH Capacity Request if V310 <= N310 ELSE stops the procedure |
| T311 | Starts upon reception of Physical Shared Channel Allocation (When “PUSCH ALLOCATION” set to “PUSCH ALLOCATION pending”) | Stops upon receipt of Physical Shared Channel Allocation (When “PUSCH allocation” set to “PUSCH allocation assignment”). At Expiry, UE initiate a PUSCH CAPACITY REQUEST procedure |
| T312 | Starts When UE starts to establish dedicated channel mode | Stops When UE detects N312 “in sync” indication from Layer-1(PHY). Timer expires when criteria for physical channel establishment failure is fulfilled |
| T313 | Timer Starts when UE detects consecutive N313 “out of sync” indication from Layer-1(PHY) | Stops when UE detects consecutive N315 “in sync” indication from Layer-1(PHY). Timer expires when the criteria for Radio Link failure is fulfilled |
| T314 | Starts after the criteria for radio link failure have been fulfilled, and if radio bearers associated with T314 exists. | Stops when the cell update procedure completes. REFER 8.3.1.13 in 3GPP TS 25.331 Specification |
| T315 | Starts after the criteria for radio link failure have been fulfilled, and if radio bearers associated with T315 exists. | Stops when the cell update procedure completes. REFER 8.3.1.14 in 3GPP TS 25.331 Specification |
| T316 | Starts when UE detects “out of service area” in the URA_PCH or CELL_PCH state | Stops when UE detects “in service area”. At expiry, initiates cell update procedure if “in service area” is detected, OTHERWISE starts timer T317, transit to CELL_FACH state and initiate cell update procedure when the UE detects “in service area” |
| T317 | Starts when timer T316 expires OR when in CELL_FACH state, UE detects “out of service area” | Stops when UE detects “in service area”. At Expiry, transits to IDLE MODE |
V300, V302, V304, V308 and V310 are counters used in UE.
N300, N302, N304, N308, N310, N312, N313 and N315 are constants used in UE.
For information refer 3GPP TS 25.331 Specification .
