The document discusses various timers related to radio resource control (RRC) connection and reestablishment procedures in cellular networks. It describes the starting and stopping conditions for timers including the interval between RRC connection requests, RRC connection reestablishment requests, timers after RRC connection reject, handover failure timers, radio link failure declaration timers, and RRC connection reestablishment recovery timers. The document notes that the values for many of these timers are operator configurable.

1. PREPARED BY: ARUP GHOSH

2. Interval between subsequent transmissions of RRC Connection Request.
>>Starts at the RRC connection REQ transmit
>>Stops at the Receipt of RRC connection setup or reject message OR at the cell
reselection time OR upon abortion of connection establishment by Higher layers (L2/L3).
>>At the expiry performs the actions
Enum {ms100, ms200, ms300, ms400, ms600, ms1000, ms1500, ms2000} This parameter is
settable by the operator

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Interval between subsequent transmission
RRC Connection Reestablishment Request
>>Starts at the RRC Connection Re-establishment REQUEST
>>Stops at the Receipt of RRC Connection Re-establishment OR
RRC Connection Re-Establishment REJECT message OR
When selected cell becomes unsuitable to continue further
>>At expiry, it Go to RRC_IDLE mode
Enum {ms100, ms200, ms300, ms400, ms600, ms1000, ms1500, ms2000} This parameter is
settable by the operator

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Time to wait for cell reselection or
RRC Connection Setup after RRC Connection Reject
Enum {ms100, ms200, ms300, ms400, ms600, ms1000, ms1500, ms2000} This parameter is
settable by the operator

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Time to wait for cell reselection or
RRC Connection Setup after RRC Connection Reject
>>Starts when access is barred while performing RRC CONNECTION ESTABLISHMENT for
MO(Mobile Originating) calls
>>Stops while entering RRC_CONNECTED and upon cell re-selection mode
>>At expiry, Informs higher layers about barring alleviation
.

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HO failure timer. Maps to t304 defined within IE Mobility Control Info in 36.331 and has
the set of values as defined in IE Mobility Control Info
>>Starts at the Receipt of RRC CONNECTION RECONFIGURATION message along with Mobility
Control Info OR at the receipt of mobility from EUTRA command message including CELL
CHANGE ORDER
>>Stops at the successful completion of HANDOVER to EUTRA or CELL CHANGE ORDER is met
>>At expiry, it performs action based on need.
1. In the case of CELL CHANGE ORDER from E-UTRA OR intra E-UTRA handover, initiate the
RRC connection re-establishment procedure.
.
2. In case of HANDOVER to E-UTRA, perform the actions defined as per the specifications
applicable for the source RAT.
ENUMERATED {ms50, ms100, ms150, ms200, ms500, ms1000, ms2000, spare1}, This parameter is
settable by the operator.

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HO failure timer. Maps to t304 defined within IE CellChangeOrder in 36.331 and has the
set of values as defined in IE CellChangeOrder
ENUMERATED {ms50, ms100, ms150, ms200, ms500, ms1000, ms2000, spare1}, This parameter is
settable by the operator.

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RLF declaration timer.
>>Starts when UE detects PHY layer related problems (when it receives N310
consecutive out-of-sync INDs from lower layers)
>>Stops 1. When UE receives N311 consecutive in-sync INDs from lower layers/
2. Upon triggering the HANDOVER procedure
3. Upon initiating the CONNECTION RE-ESTABLISHMENT procedure
>> At expiry, if security is not activated it goes to RRC IDLE else it initiates the CONNECTION
RE-ESTABLISHMENT Procedure
Enum ms0, ms50, ms100, ms200, ms500, ms1000, ms2000} This parameter is settable by the
operator.

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RLF recovery timer.
>>Starts while initiating RRC CONNECTION RE-ESTABLISHMENT procedure.
>>stops upon selection of suitable E-UTRA cell OR a cell using another RAT
>>At expiry it enters RRC IDLE state
Enum {ms1000, ms3000, ms5000, ms10000, ms15000, ms20000, ms30000} This parameter is
settable by the operator