11 List of system parameters

3GPP44.018GSM/EDGE Radio Resource Control (RRC) protocolMobile radio interface Layer 3 specificationRelease 17TS

The description of timers in the following table should be considered a brief summary. The precise details are found in clauses 3 to 6, which should be considered the definitive descriptions.

11.1 Timers and counters for radio resource management

11.1.1 Timers on the mobile station side

T3110: This timer is used to delay the channel deactivation after the receipt of a (full) CHANNEL RELEASE. Its purpose is to let some time for disconnection of the main signalling link.

Its value is set to such that the DISC frame is sent twice in case of no answer from the network. (It should be chosen to obtain a good probability of normal termination (i.e. no time out of T3109) of the channel release procedure.)

T3112 The timer is used by a VGCS mobile when receiving segmented RP-Data message on the SACCH. The timer is started when receiving the first segment of a segmented RP-Data message for a group call that the MS is a member of, for which no previous segment has been received.

It is stopped in the following situations:

– The MS receives the complete RP-Data message

– The MS discards the message as a result of timer T3114 expiring for some other message

– The MS deletes the segment(s) (with SMS reference number n) because it has received a segment with a SMS reference number which is more than 4 higher (modulo 16) than that of the message corresponding to this timer

– The MS changes its channel

– The voice group call is cleared

The value of the timer is 20 seconds.

T3114 The timer is used by a VGCS mobile when receiving a complete RP-Data message on the SACCH that is not the next in sequence message that is to be sent to the upper layer.

It is stopped in the following situations:

– The MS delivers the RP-Data message to the upper layer

– The MS changes its channel

– The voice group call is cleared

The value of the timer is 10 seconds.

T3122: This timer is used during random access or during dedicated channel assignment while in packet transfer mode, after the receipt of an IMMEDIATE ASSIGN REJECT message.

Its value is given by the network in the IMMEDIATE ASSIGN REJECT message.

T3124: This timer is used in the seizure procedure during a hand-over, when the two cells are not synchronized.

Its purpose is to detect the lack of answer from the network to the special signal.

Its value is set to 675 ms if the channel type of the channel allocated in the HANDOVER COMMAND is an SDCCH (+ SACCH); otherwise its value is set to 320 ms.

T3126: This timer is started either

after sending the maximum allowed number of CHANNEL REQUEST messages or EGPRS PACKET CHANNEL REQUEST messages during an immediate assignment procedure,

or

on receipt of an IMMEDIATE ASSIGNMENT REJECT message,

or

when a mobile station accessing the network when the low priority indicator is set to "MS is configured to NAS signalling low priority" (see 3GPP TS 24.008) has initiated the immediate assignment procedure, sent one or more CHANNEL REQUEST messages and received an implicit reject for the CS domain (see sub-clause 3.3.1.1.2),

whichever occurs first.

It is stopped at receipt of an IMMEDIATE ASSIGNMENT message, an IMMEDIATE ASSIGNMENT EXTENDED message, or an IMMEDIATE PACKET ASSIGNMENT message (if supported).

At its expiry, the immediate assignment procedure is aborted and the mobile station proceeds as described in sub-clause 3.3.1.1.2 or the Implicit Reject procedure is completed as described in sub-clause 3.3.1.1.3.2a.

The minimum value of this timer is equal to the time taken by T+2S slots of the mobile station’s RACH. S and T are defined in sub-clause 3.3.1.2. The maximum value of this timer is 5 seconds.

T3128: This timer is started when the mobile station starts the uplink investigation procedure and the uplink is busy.

It is stopped at receipt of the first UPLINK FREE message.

At its expiry, the uplink investigation procedure is aborted.

The value of this timer is set to 1 second.

T3130: This timer is started after sending the first UPLINK ACCESS message during a VGCS uplink access procedure, or sending the first PRIORITY UPLINK REQUEST message during a VGCS priority uplink request procedure.

It is stopped at receipt of a VGCS UPLINK GRANT message.

It may be started a maximum of 3 times. On expiry of timer T3130 for the third time a rejection of the uplink request is indicated to the upper layers.

The value of this timer is set to 5 seconds.

T3142: The timer is used during packet access on CCCH and during packet access while in dedicated mode. It is started after the receipt of an IMMEDIATE ASSIGNMENT REJECT or a DTM REJECT or an EC IMMEDIATE ASSIGNMENT REJECT message.

Its value is given by the network in the IMMEDIATE ASSIGNMENT REJECT or DTM REJECT message.

T3146: This timer is started either

after sending the maximum allowed number of CHANNEL REQUEST or EGPRS PACKET CHANNEL REQUEST or EC PACKET CHANNEL REQUEST or EGPRS MULTILATERATION REQUEST or EC MULTILATERATION REQUEST messages during a packet access procedure.

or

on receipt of an IMMEDIATE ASSIGNMENT REJECT or EC IMMEDIATE ASSIGNMENT REJECT message during a packet access procedure,

or

a mobile station accessing the network when the low priority indicator is set to "MS is configured to NAS signalling low priority" (see 3GPP TS 24.008) has initiated the packet access procedure, has sent one or more CHANNEL REQUEST or one or more EGPRS PACKET CHANNEL REQUEST or one or more EC PACKET CHANNEL REQUEST messages and received an implicit reject for the PS domain (see sub-clause 3.5.2.1.2 or 3.5.2.1.2a),

whichever occurs first.

It is stopped at receipt of an IMMEDIATE ASSIGNMENT message, an IMMEDIATE ASSIGNMENT EXTENDED message, or an IMMEDIATE PACKET ASSIGNMENT message (if supported) or an EC IMMEDIATE ASSIGNMENT TYPE 1 message or an EC IMMEDIATE ASSIGNMENT TYPE 2 or an EC IMMEDIATE ASSIGNMENT TYPE 3 or EC IMMEDIATE ASSIGNMENT TYPE 4 message.

At its expiry, if the packet access procedure is ongoing then it is aborted and the mobile station proceeds as described in sub-clause 3.5.2.1.2 or 3.5.2.1.2a or the Implicit Reject procedure is completed as described in sub-clause 3.3.1.1.3.2a or the EC Implicit Reject procedure is completed as described in sub-clause 3.5.2a.2. At expiry of timer T3146, if the radio access part of the MTA procedure is ongoing then it is terminated for the current cell and the mobile station MS tunes to the next cell in the list of applicable cells and continues the radio access part of the MTA procedure therein.

For the case where a CHANNEL REQUEST or EGPRS PACKET CHANNEL REQUEST has been sent the minimum value of this timer is equal to the time taken by T+2S slots of the mobile station’s RACH. S and T are defined in sub-clause 3.3.1.2. The maximum value of this timer is 5 seconds. For the case where an EC PACKET CHANNEL REQUEST message has been sent the value of this timer is equal to the total number of downlink 51-multiframes it reads in an attempt to find a matching response (see sub-clause 3.5.2.1.2a).

T3148: This timer is used during DTM establishment in dedicated mode.

It is started after sending a DTM REQUEST message during a packet access procedure while in dedicated mode.

It is stopped at the receipt of one of the following messages:

– DTM ASSIGNMENT COMMAND;

– PACKET ASSIGNMENT;

– DTM REJECT;

– ASSIGNMENT COMMAND;

– HANDOVER COMMAND.

At its expiry, the packet access procedure is aborted.

Its value is 4 seconds.

T3164: This timer is used during packet access using CCCH. It is started at the receipt of an IMMEDIATE ASSIGNMENT message or an IMMEDIATE PACKET ASSIGNMENT message (if supported).

It is stopped at the transmission of a RLC/MAC block on the assigned temporary block flow, see 3GPP TS 44.060.

At expire, the mobile station returns to the packet idle mode.

The value of the timer is 5 seconds.

T3190: The timer is used during packet downlink assignment on CCCH. It is started at the receipt of an IMMEDIATE ASSIGNMENT message or an IMMEDIATE PACKET ASSIGNMENT message (if supported) when in dedicated mode.

It is stopped at the receipt of a RLC/MAC block on the assigned temporary block flow, see 3GPP TS 44.060.

At expiry, the mobile station returns to the packet idle mode.

The value of the timer is 5 seconds.

T3204: This timer is used by a mobile station with non-GSM capabilities. The timer is started after sending the first CHANNEL REQUEST during a packet access procedure. The CHANNEL REQUEST was sent requesting a single block packet access and the purpose of the packet access procedure is to send a PACKET PAUSE message.

It is stopped at the receipt of an IMMEDIATE ASSIGNMENT message granting a single block period on an assigned packet uplink resource.

At expiry, the packet access procedure is aborted.

The value of the timer is 1 second.

T3206 The timer is used by a VGCS mobile when receiving segmented notifications on the NCH. The timer is started when receiving a segment of a segmented notification for a group call that the MS is a member for which no previous segment has been received.

It is stopped in the following situations:

– The MS receives the second segment

– The MS joins another call

– The value of NLN changes

– The MS reselects to another cell

The value of the timer is 5 second.

T3208 The timer is used by a VGCS mobile when receiving segmented notifications on the FACCH. The timer is started when receiving the first segment of a segmented notification for a group call that the MS is a member for which no previous segment has been received.

It is stopped in the following situations:

– The MS receives the complete message

– The MS joins another call

– The MS performs Handover to another cell

The value of the timer is 1 second.

T3210 The timer is used by a VGCS mobile when receiving segmented notifications on the PCH. The timer is started when receiving the first segment of a segmented notification for a group call that the MS is a member for which no previous segment has been received.

It is stopped in the following situations:

– The MS receives the complete message

– The MS leaves Idle mode

– Notifications for another group call are received on the PCH

The value of the timer is 5 seconds.

T3220 The timer is used by an MBMS capable mobile station when receiving pre-notification of an MBMS session. The timer is started when receiving a PAGING REQUEST message containing an MBMS pre-notification that the mobile station shall receive.

It is stopped at the receipt of a PAGING REQUEST message containing a notification of the same session as when starting this timer, or if any other RR procedure on CCCH not related to MBMS is triggered or a notification is received for a higher priority session while the timer is running.

At expiry, the mobile station returns to DRX mode unless it is engaged in any other MBMS session and then stays in broadcast/multicast receive mode.

The value of the timer is 46 s.

T3222: An instance of the timer may be used by an MBMS capable mobile station in dedicated mode during the notification of MBMS. An instance of this timer may be started at the receipt of an MBMS ANNOUNCEMENT message when in dedicated mode.

The instance of this timer is stopped when the mobile enters packet idle mode.

At expiry of an instance of this timer, the mobile station discards the MBMS related information stored upon receipt of the corresponding MBMS ANNOUNCEMENT message.

The value of the timer is defined in sub-clause 3.4.27.2.3.

T3224: The timer start at on receipt of a VGCS_UPLINK_GRANT message aimed to another mobile station.

It is stopped when the mobile station received an UPLINK BUSY message.

At expiry, the mobile station shall follow the same procedures as for expiry of timer T3130.

The value of the timer is 1 s.

T3230: The timer is used to control the validity period of individual priorities. It is started on receipt of the individual priorities for cell reselection via dedicated signalling or on inter-RAT reselection to GERAN if the corresponding timer in the source RAT (i.e., T320 in E-UTRA, and T322 in UTRA) was running when reselection occurred.

When one of the conditions specified in subclause 3.2.3.3 is met, the MS shall stop T3230 and delete the corresponding individual priorities.

At expiry the mobile station shall delete the corresponding individual priorities.

T3232: The timer is used to control the length of the non-DRX mode period in which the mobile station is acquiring an ETWS Primary Notification message. It is started on receipt of a first PAGING REQUEST TYPE 1 message containing a valid segment of an ETWS Primary Notification message.

It is stopped in the following situations:

The mobile station receives the complete ETWS Primary Notification message

Upon initiating cell reselection or connection establishment procedures

The timer is restarted if the mobile station receives an indication of a new ETWS Primary Notification message prior to acquiring a complete ETWS Primary Notification message.

At expiry the mobile station shall discard all segments of the partially received ETWS Primary Notification message and re-enter DRX mode.

The value of the timer is 5 seconds.

T3234: The timer is used to prevent a mobile station accessing the network when the low priority indicator is set to "MS is configured to NAS signalling low priority" (see 3GPP TS 24.008) from requesting CS resources (see sub-clause 3.3.1.1.3.2a). When a mobile station starts an implicit reject timer it selects a value randomly drawn from a uniform probability distribution within the set {10.0, 10.1, 10.2, …200.0} seconds (inclusive).

It is started when the Implicit Reject procedure is initiated following mobile station reception of an implicit reject indication for the CS domain prior to sending any CHANNEL REQUEST messages on the RACH or when T3126 expires (see sub-clause 3.3.1.1.3.2a).

It is stopped in the following cases:

– The mobile station responds to a PAGING REQUEST message

– The mobile station performs cell re-selection.

At expiry, the mobile station may once again access the network when the low priority indicator is set to "MS is configured to NAS signalling low priority" and request CS resources.

T3236: The timer is used to prevent a mobile station accessing the network when the low priority indicator is set to "MS is configured to NAS signalling low priority" (see 3GPP TS 24.008) from requesting PS resources (see sub-clause 3.3.1.1.3.2a and sub-clause 3.5.2a.2). When a mobile station starts an implicit reject timer it selects a value randomly drawn from a uniform probability distribution within the set {10.0, 10.1, 10.2, …200.0} seconds (inclusive).

It is started when T3146 expires (see sub-clause 3.3.1.1.3.2a or 3.5.2a.2).

It is stopped in the following cases:

– The mobile station responds to a PAGING REQUEST or an EC PAGING REQUEST message

– The mobile station performs cell re-selection.

At expiry, the mobile station may once again access the network when the low priority indicator is set to "MS is configured to NAS signalling low priority" and request PS resources.

11.1.2 Timers on the network side

T3101: This timer is started when a channel is allocated with an IMMEDIATE ASSIGNMENT message. It is stopped when the MS has correctly seized the channels.

Its value is network dependent.

NOTE 1: It could be higher than the maximum time for a L2 establishment attempt.

T3103: This timer is started by the sending of a HANDOVER message and is normally stopped when the MS has correctly seized the new channel. Its purpose is to keep the old channels sufficiently long for the MS to be able to return to the old channels, and to release the channels if the MS is lost.

Its value is network dependent.

NOTE 2: It could be higher than the maximum transmission time of the HANDOVER COMMAND, plus the value of T3124, plus the maximum duration of an attempt to establish a data link in multiframe mode.)

T3105: This timer is used for the repetition of the PHYSICAL INFORMATION message during the hand-over procedure.

Its value is network dependent.

NOTE 3: This timer may be set to such a low value that the message is in fact continuously transmitted.

T3107: This timer is started by the sending of an ASSIGNMENT COMMAND or a DTM ASSIGNMENT COMMAND message and is normally stopped when the MS has correctly seized the new RR channels.

Its purpose is to release the new channels (and, in the case of Enhanced DTM CS establishment, the old PS resources) if the MS is lost and, except when used for Enhanced DTM CS Establishment, to keep the old channel sufficiently long for the MS to be able to return to the old channels.

Its value is network dependent.

NOTE 4: It could be higher than the maximum transmission time of the ASSIGNMENT COMMAND message plus twice the maximum duration of an attempt to establish a data link multiframe mode.

T3109: This timer is started when a lower layer failure is detected by the network, when it is not engaged in a RF procedure. It is also used in the channel release procedure.

Its purpose is to release the channels in case of loss of communication.

Its value is network dependent.

NOTE 5: Its value should be large enough to ensure that the MS detects a radio link failure.

T3111: This timer is used to delay the channel deactivation after disconnection of the main signalling link. Its purpose is to let some time for possible repetition of the disconnection.

Its value is equal to the value of T3110.

T3113: This timer is started when the network has sent a PAGING REQUEST message and is stopped when the network has received the PAGING RESPONSE message.

Its value is network dependent.

NOTE 6: The value could allow for repetitions of the Channel Request message and the requirements associated with T3101.

T3115: This timer is used for the repetition of the VGCS UPLINK GRANT message during the uplink access procedure or priority uplink request procedure.

Its value is network dependent.

NOTE 7: This timer may be set to such a low value that the message is in fact continuously transmitted.

T3121: This timer is started by the sending of an INTER SYSTEM TO UTRAN HANDOVER COMMAND message or of an INTER SYSTEM TO E-UTRAN HANDOVER COMMAND and is normally stopped when the MS has correctly seized the UTRAN channel(s) or E-UTRAN channel(s). Its purpose is to keep the old channels sufficiently long for the MS to be able to return to the old channels, and to release the channels if the MS is lost.

Its value is network dependent.

T3123: This timer is started by the sending of an INTER SYSTEM TO CDMA2000 HANDOVER COMMAND message and is normally stopped when the MS has correctly seized the CDMA2000 channel(s). Its purpose is to keep the old channels sufficiently long for the MS to be able to return to the old channels, and to release the channels if the MS is lost.

Its value is network dependent.

T3141: This timer is started when a temporary block flow is allocated with an IMMEDIATE ASSIGNMENT or an IMMEDIATE PACKET ASSIGNMENT or an EC IMMEDIATE ASSIGNMENT TYPE 1 message during a packet access procedure. It is stopped when the mobile station has correctly seized the temporary block flow.

Its value is network dependent.

T3151: This timer is used by the network to supervise the periodic transmission of the UPLINK BUSY message on the FACCH of the voice group call channel (see sub-clause 3.3.1.2.2a.2.2).

Its value is network dependent.

T3153: This timer is used by the network to supervise the periodic transmission of the VGCS ADDITIONAL INFORMATION message on the SACCH of the voice group call channel (see subclause 3.4.15.3a).

Its value is network dependent.

T3155: In a network supporting validation of Priority Uplink Requests, the timer T3155 supervises the broadcast of a new token after a valid Priority Uplink Request has been received.

If a Priority Uplink Request is received, and the token matches the token in the BSS then the request is accepted, the token is invalidated and T3155 is started. On T3155 expiry a new token, and the priority of the accepted request, shall be sent in the UPLINK BUSY message on the FACCH of the voice group call channels. The T3155 timer should be set to a value that allows other service subscribers who sent a Priority Uplink Request at the same time as the one accepted by the network, to be back on the voice group call channel, in order to receive the new token.

The default value for T3155 is 500ms.

T3157: In a network supporting validation of Priority Uplink Requests, the timer T3157 supervises an additional validity period for an unused (old) token. When T3151 (supervising the periodic UPLINK BUSY) expires a new token is sent in the UPLINK BUSY message on the FACCH of the voice group call channels and timer T3157 is started. If a Priority Uplink Request is received before T3157 expires and the token matches either token in the BSS (old or new), the request is considered to be valid, both tokens in the BSS are invalidated and T3157 is stopped. If T3157 expires (i.e. no valid Priority Uplink Request has been received within T3157 seconds) the old token is invalidated.

The value of timer T3157 is operator specific. The value chosen should allow for the reception of requests from service subscribers, who have left the group call channel before receipt of the UPLINK BUSY message with the new token.

Its default value is 1s.

11.1.3 Other parameters

Ny1: The maximum number of repetitions for the PHYSICAL INFORMATION message during a handover (see sub-clause 3.4.4.2.2). The value is network dependent.

Ny2: The maximum number of repetitions for the VGCS UPLINK GRANT message during an uplink access procedure or priority uplink request procedure (see sub-clause 3.3.1.2.2). The value is network dependent.

11.2 Timers of mobility management

See 3GPP TS 24.008.

11.3 Timers of circuit-switched call control

See 3GPP TS 24.008.

Annex A (informative):
Example of subaddress information element coding

See 3GPP TS 24.008.

Annex B (normative):
Compatibility checking

See 3GPP TS 24.008.

Annex C (normative):
Low layer information coding principles

See 3GPP TS 24.008.

Annex D (informative):
Examples of bearer capability information element coding

See 3GPP TS 24.008.

Annex E (informative):
Comparison between call control procedures specified in 3GPP TS 24.008 and ITU-T Recommendation Q.931

See 3GPP TS 24.008.

Annex F (informative):
GSM specific cause values for radio resource management

This annex is informative.

Cause value = 0 Normal event;

indicates that the channel is released because of a normal event or that an assignment or handover is successfully, and normally, completed.

Cause value = 1 Abnormal release, unspecified;

indicates that the channel is released because of an abnormal event without specifying further reasons.

Cause value = 2 Abnormal release, channel unacceptable;

indicates that the channel type or channel characteristics are not acceptable.

Cause value = 3 Abnormal release, timer expired;

indicates that the release is caused by a timer expiry.

Cause value = 4 Abnormal release, no activity on the radio path;

indicates that some supervisory function has detected that the channel is not active.

Cause value = 5 Pre-emptive release;

indicates that the channel is released in order to be allocated to a call with priority (e.g. an emergency call).

Cause value = 6 UTRAN configuration unknown;

indicates that the MS does not know the UTRAN predefined configuration (i.e. was not read from UTRAN Channels) or that the MS does not have the capability to handle the requested default configuration.

Cause value = 8 Handover impossible, timing advance out of range;

indicates that a handover is unsuccessful because the target BTS is beyond the normal range and the target BTS would not accept an out of range timing advance.

Cause value = 9 Channel mode unacceptable

indicates that the MS does not have the capability to handle the requested mode or type of channel.

Cause value = 10 Frequency not implemented

indicates that the MS does not have the capability to operate on (at least one of) the requested frequency(ies).

Cause value = 11 Originator or talker leaving group call area

indicates that VGCS uplink or VBS call is released because the mobile talking is outside the group call area

Cause value = 12 Lower layer failure

indicates that a lower layer failed to establish a connection on the new channel.

Cause value = 65 Call already cleared;

indicates that a handover is unsuccessful because the connection has been released by the network or the remote user.

Cause value = 95 Semantically incorrect message;

See annex H, sub-clause H5.10.

Cause value = 96 Invalid mandatory information;

See annex H, sub-clause H6.1.

Cause value = 97 Message type non-existent or not implemented;

See annex H, sub-clause H6.2.

Cause value = 98 Message type not compatible with protocol state;

See annex H, sub-clause H6.3

Cause value = 100 Conditional IE error;

See annex H, sub-clause H6.5

Cause value = 101 No cell allocation available;

indicates that an assignment or handover is unsuccessful because the MS has no current CA.

Cause value = 111 Protocol error unspecified;

See annex H, sub-clause H6.8.

Annex G (informative):
GSM specific cause values for mobility management

See 3GPP TS 24.008.

Annex H (informative):
GSM specific cause values for call control

See 3GPP TS 24.008.

Annex I (informative):
GSM specific cause values for session management

See 3GPP TS 24.008.

Annex J (informative):
Algorithm to encode frequency list information elements

This annex is informative.