9.2 Messages for mobility management

24.0083GPPCore network protocolsMobile radio interface Layer 3 specificationRelease 18Stage 3TS

Table 9.2.1/3GPP TS 24.008 summarizes the messages for mobility management.

Table 9.2.1/3GPP TS 24.008: Messages for mobility management

Registration messages:	Reference
IMSI DETACH INDICATION	9.2.12
LOCATION UPDATING ACCEPT	9.2.13
LOCATION UPDATING REJECT	9.2.14
LOCATION UPDATING REQUEST	9.2.15
Security messages:	Reference
AUTHENTICATION REJECT	9.2.1
AUTHENTICATION REQUEST	9.2.2
AUTHENTICATION RESPONSE	9.2.3
AUTHENTICATION FAILURE	9.2.3a
IDENTITY REQUEST	9.2.10
IDENTITY RESPONSE	9.2.11
TMSI REALLOCATION COMMAND	9.2.17
TMSI REALLOCATION COMPLETE	9.2.18
Connection management messages:	Reference
CM SERVICE ACCEPT	9.2.5
CM SERVICE PROMPT	9.2.5a
CM SERVICE REJECT	9.2.6
CM SERVICE ABORT	9.2.7
CM SERVICE REQUEST	9.2.9
CM RE-ESTABLISHMENT REQUEST	9.2.4
ABORT	9.2.8
Miscellaneous message:	Reference
MM INFORMATION	9.2.15a
MM STATUS	9.2.16
MM NULL	9.2.19

9.2.1 Authentication reject

This message is sent by the network to the mobile station to indicate that authentication has failed (and that the receiving mobile station shall abort all activities). See table 9.2.2/3GPP TS 24.008.

Message type: AUTHENTICATION REJECT

Significance: dual

Direction: network to mobile station

Table 9.2.2/3GPP TS 24.008: AUTHENTICATION REJECT message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	Authentication Reject	Message type	M	V	1
	message type	10.4

9.2.2 Authentication request

This message is sent by the network to the mobile station to initiate authentication of the mobile station identity. See table 9.2.3/3GPP TS 24.008.

Message type: AUTHENTICATION REQUEST

Significance: dual

Direction: network to mobile station

Table 9.2.3/3GPP TS 24.008: AUTHENTICATION REQUEST message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	Authentication Request	Message type	M	V	1
	message type	10.4
	Ciphering key sequence	Ciphering key sequence	M	V	1/2
	number	number
		10.5.1.2
	Spare half octet	Spare half octet	M	V	1/2
		10.5.1.8
	Authentication	Auth. parameter RAND	M	V	16
	parameter RAND (UMTS challenge or GSM challenge)	10.5.3.1
20	Authentication	Auth. parameter AUTN	O	TLV	18
	Parameter AUTN	10.5.3.1.1

9.2.2.1 Authentication Parameter AUTN

This IE shall be present if and only if the authentication challenge is a UMTS authentication challenge.The presence or absence of this IE defines- in the case of its absence- a GSM authentication challenge or- in the case of its presence- a UMTS authentication challenge.

The MS shall ignore the IE if a SIM is inserted in the MS.

In UMTS, the MS shall reject the AUTHENTICATION REQUEST message as specified in subclause 4.3.2.5.1 if this IE is not present and a USIM is inserted in the MS.

9.2.3 Authentication response

This message is sent by the mobile station to the network to deliver a calculated response to the network. See table 9.2.4/3GPP TS 24.008.

Message type: AUTHENTICATION RESPONSE

Significance: dual

Direction: mobile station to network

Table 9.2.4/3GPP TS 24.008: AUTHENTICATION RESPONSE message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	Authentication Response	Message type	M	V	1
	message type	10.4
	Authentication Response	Auth. Response parameter	M	V	4
	parameter	10.5.3.2
21	Authentication Response	Auth. Response parameter	O	TLV	3-14
	Parameter (extension)	10.5.3.2.1

9.2.3.1 Authentication Response Parameter

This IE contains the SRES, if it was a GSM authentication challenge, or the RES (all or just the 4 most significant octets of) if it was a UMTS authentication challenge (see also subclause 9.2.3.2).

9.2.3.2 Authentication Response Parameter (extension)

This IE shall be included if and only if the authentication challenge was a UMTS authentication challenge and the RES parameter is greater than 4 octets in length. It shall contain the least significant remaining bits of the RES (the four most significant octets shall be sent in the Authentication Response Parameter IE (see subclause 9.2.3.1))

This IE shall not be included if a SIM is inserted in the MS.

9.2.3a Authentication Failure

This message is sent by the mobile station to the network to indicate that authentication of the network has failed. See table 9.2.4a/3GPP TS 24.008.

Message type: AUTHENTICATION FAILURE

Significance: dual

Direction: mobile station to network

Table 9.2.4a/3GPP TS 24.008: AUTHENTICATION FAILURE message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	Protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	Authentication Failure	Message type	M	V	1
	Message type	10.4
	Reject Cause	Reject Cause 10.5.3.6	M	V	1
22	Authentication Failure parameter	Authentication Failure parameter	O	TLV	16
		10.5.3.2.2

9.2.3a.1 Authentication Failure parameter

This IE shall be sent if and only if the reject cause was "Synch failure". It shall include the response to the authentication challenge from the USIM, which is made up of the AUTS parameter (see 3GPP TS 33.102 [5a]).

9.2.4 CM Re-establishment request

This message is sent by the mobile station to the network to request re-establishment of a connection if the previous one has failed. See table 9.2.5/3GPP TS 24.008.

Message type: CM RE-ESTABLISHMENT REQUEST

Significance: dual

Direction: mobile station to network

Table 9.2.5/3GPP TS 24.008: CM RE-ESTABLISHMENT REQUEST message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	½
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	½
		10.3.1
	CM Re-Establishment	Message type	M	V	1
	Request message type	10.4
	Ciphering key sequence	Ciphering key sequence	M	V	½
	number	number
		10.5.1.2
	Spare half octet	Spare half octet	M	V	½
		10.5.1.8
	Mobile station	Mobile station	M	LV	4
	classmark	classmark 2
		10.5.1.6
	Mobile identity	Mobile identity	M	LV	2-9
		10.5.1.4
13	Location area	Location area	C	TV	6
	identification	identification
		10.5.1.3
D-	Device properties	Device properties	O	TV	1
		10.5.7.8

NOTE: In A/Gb mode, the maximum number of octets that can be transferred is 20.

9.2.4.1 Location area identification

The location area identification information element shall appear when a TMSI is used as mobile identity, to render that mobile identity non-ambiguous. This is the LAI stored in the SIM/USIM.

9.2.4.2 Mobile Station Classmark

This IE shall include for multiband mobile station the Classmark 2 corresponding to the frequency band in use.

9.2.4.3 Device properties

This IE shall be included if the MS is configured for NAS signalling low priority.

9.2.5 CM service accept

This message is sent by the network to the mobile station to indicate that the requested service has been accepted. See table 9.2.6/3GPP TS 24.008.

Message type: CM SERVICE ACCEPT

Significance: dual

Direction: network to mobile station

Table 9.2.6/3GPP TS 24.008: CM SERVICE ACCEPT message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	CM Service Accept	Message type	M	V	1
	message type	10.4

9.2.5a CM service prompt $(CCBS)$

A mobile station that does not support the "Network initiated MO call" option shall treat this message as a message with message type not defined for the PD.

This message is sent by the network to the mobile station to request the mobile to establish a service for the specified CM protocol using the specified SAPI, e.g. circuit switched connection establishment on SAPI 0, supplementary services activation on SAPI 0, or short message transfer on SAPI 3. See Table 9.2.7/3GPP TS 24.008.

Message type: CM SERVICE PROMPT

Significance: dual

Direction: network to mobile station

Table 9.2.7/3GPP TS 24.008: CM SERVICE PROMPT message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	CM Service Prompt	Message type	M	V	1
	message type	10.4
	PD and SAPI of CM	PD and SAPI	M	V	1
		10.5.1.10a

9.2.6 CM service reject

This message is sent by the network to the mobile station to indicate that the requested service cannot be provided. See table 9.2.8/3GPP TS 24.008.

Message type: CM SERVICE REJECT

Significance: dual

Direction: network to mobile station

Table 9.2.8/3GPP TS 24.008: CM SERVICE REJECT message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	CM Service Reject	Message type	M	V	1
	message type	10.4
	Reject cause	Reject cause	M	V	1
		10.5.3.6
36	T3246 value	MM timer	O	TLV	3
		10.5.3.16

9.2.6.1 T3246 value

This IE may be included when the CS domain NAS level mobility management congestion control is active.

9.2.7 CM service abort

This message is sent by the mobile station to the network to request the abortion of the first MM connection establishment in progress and the release of the RR connection. See table 9.2.9/3GPP TS 24.008.

Message type: CM SERVICE ABORT

Significance: dual

Direction: mobile station to network

Table 9.2.9/3GPP TS 24.008: CM SERVICE ABORT message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	CM Service Abort	Message type	M	V	1
	message type	10.4

9.2.8 Abort

This message is sent by the network to the mobile station to initiate the abortion of all MM connections and to indicate the reason for the abortion. See table 9.2.10/3GPP TS 24.008.

Message type: ABORT

Significance: dual

Direction: network to mobile station

Table 9.2.10/3GPP TS 24.008: ABORT message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	Abort	Message type	M	V	1
	message type	10.4
	Reject cause	Reject cause	M	V	1
		10.5.3.6

9.2.9 CM service request

This message is sent by the mobile station to the network to request a service for the connection management sublayer entities, e.g. circuit switched connection establishment, supplementary services activation, short message transfer, location services. See table 9.2.11/3GPP TS 24.008.

Message type: CM SERVICE REQUEST

Significance: dual

Direction: mobile station to network

Table 9.2.11/3GPP TS 24.008: CM SERVICE REQUEST message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	½
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	½
		10.3.1
	CM Service Request	Message type	M	V	1
	message type	10.4
	CM service type	CM service type	M	V	½
		10.5.3.3
	Ciphering key sequence	Ciphering key sequence	M	V	½
	number	number
		10.5.1.2
	Mobile station	Mobile station	M	LV	4
	classmark	classmark 2
		10.5.1.6
	Mobile identity	Mobile identity	M	LV	2-9
		10.5.1.4
8-	Priority	Priority Level	O	TV	1
		10.5.1.11
C-	Additional update parameters	Additional update parameters	O	TV	1
		10.5.3.14
D-	Device properties	Device properties	O	TV	1
		10.5.7.8

9.2.9.1 Mobile Station Classmark

This IE shall include for multiband mobile station the Classmark 2 corresponding to the frequency band in use.

9.2.9.2 Priority

May be included by mobile station supporting eMLPP to indicate the priority requested.

This information element is only meaningful when the CM service type is:

Mobile originating call establishment;

Emergency call establishment;

Voice group call establishment;

Voice broadcast call establishment.

9.2.9.3 Additional update parameters

The MS shall include this IE during CS fallback for a mobile originating call or if the MS is requested by the upper layers to set up a mobile originating "DRVCC call" (see subclause 4.5.1.1).

9.2.9.4 Device properties

This IE shall be included if the MS is configured for NAS signalling low priority.

9.2.10 Identity request

This message is sent by the network to the mobile station to request a mobile station to submit the specified identity to the network. See table 9.2.12/3GPP TS 24.008.

Message type: IDENTITY REQUEST

Significance: dual

Direction: network to mobile station

Table 9.2.12/3GPP TS 24.008: IDENTITY REQUEST message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	Identity Request	Message type	M	V	1
	message type	10.4
	Identity type	Identity type	M	V	1/2
		10.5.3.4
	Spare half octet	Spare half octet	M	V	1/2
		10.5.1.8

9.2.11 Identity response

This message is sent by the mobile station to the network in response to an IDENTITY REQUEST message providing the requested identity. See table 9.2.13/3GPP TS 24.008.

Message type: IDENTITY RESPONSE

Significance: dual

Direction: mobile station to network

Table 9.2.13/3GPP TS 24.008: IDENTITY RESPONSE message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	Identity Response	Message type	M	V	1
	message type	10.4
	Mobile identity	Mobile identity	M	LV	2-10
		10.5.1.4
E-	P-TMSI type	P-TMSI type	O	TV	1
		10.5.5.29
1B	Routing area identification	Routing area identification 2 10.5.5.15a	O	TLV	8
19	P-TMSI signature	P-TMSI signature 2	O	TLV	5
		10.5.5.8a

9.2.12 IMSI detach indication

This message is sent by the mobile station to the network to set a deactivation indication in the network. See table 9.2.14/3GPP TS 24.008.

Message type: IMSI DETACH INDICATION

Significance: dual

Direction: mobile station to network

Table 9.2.14/3GPP TS 24.008: IMSI DETACH INDICATION message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	IMSI Detach Indication	Message type	M	V	1
	message type	10.4
	Mobile station	Mobile station	M	V	1
	classmark	classmark 1
		10.5.1.5
	Mobile identity	Mobile identity	M	LV	2-9
		10.5.1.4

9.2.12.1 Mobile Station Classmark

This IE shall include for multiband mobile station the Classmark 1 corresponding to the frequency band in use.

9.2.13 Location updating accept

This message is sent by the network to the mobile station to indicate that updating or IMSI attach in the network has been completed. See table 9.2.15/3GPP TS 24.008.

Message type: LOCATION UPDATING ACCEPT

Significance: dual

Direction: network to mobile station

Table 9.2.15/3GPP TS 24.008: LOCATION UPDATING ACCEPT message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	½
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	½
		10.3.1
	Location Updating	Message type	M	V	1
	Accept message type	10.4
	Location area	Location area	M	V	5
	identification	identification
		10.5.1.3
17	Mobile identity	Mobile identity	O	TLV	3-10
		10.5.1.4
A1	Follow on proceed	Follow on proceed	O	T	1
		10.5.3.7
A2	CTS permission	CTS permission	O	T	1
		10.5.3.10
4A	Equivalent PLMNs	PLMN list	O	TLV	5-47
		10.5.1.13
34	Emergency Number List	Emergency Number List 10.5.3.13	O	TLV	5-50
35	Per MS T3212	GPRS Timer 3 10.5.7.4a	O	TLV	3
D-	Non-3GPP NW provided policies	Non-3GPP NW provided policies 10.5.5.37	O	TV	1

9.2.13.1 Follow on proceed

The follow on proceed information element appears if the network wishes to indicate that the mobile station may attempt an MM connection establishment using the same RR connection.

9.2.13.2 CTS permission

The CTS permission information element appears if the network wishes to allow the mobile station to use GSM-Cordless Telephony System in the Location Area.

9.2.13.3 Equivalent PLMNs

The Equivalent PLMNs information element is included if the network wants to inform the mobile station of equivalent PLMNs.

9.2.13.4 Emergency Number List

This IE may be sent by the network. If this IE is sent, the contents of this IE indicates a list of emergency numbers valid within the same country as the PLMN from which this IE is received.

9.2.13.5 Per MS T3212

This IE may be sent by the network to provide the MS with a periodic LAU timer that may be different to the broadcast value, e.g. to lengthen the timer.

9.2.13.6 Non-3GPP NW provided policies

This IE is included if the network needs to indicate whether emergency numbers provided via non-3GPP access can be used to initiate MS detected emergency calls (see 3GPP TS 24.302 [156]). If this IE is not included then the MS shall interpret this as a receipt of an information element with all bits of the value part coded as zero.

9.2.14 Location updating reject

This message is sent by the network to the mobile station to indicate that updating or IMSI attach has failed. See table 9.2.16/3GPP TS 24.008.

Message type: LOCATION UPDATING REJECT

Significance: dual

Direction: network to mobile station

Table 9.2.16/3GPP TS 24.008: LOCATION UPDATING REJECT message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	Location Updating	Message type	M	V	1
	Reject message type	10.4
	Reject cause	Reject cause	M	V	1
		10.5.3.6
36	T3246 value	MM timer	O	TLV	3
		10.5.3.16

9.2.14.1 T3246 value

This IE may be included when the CS domain NAS level mobility management congestion control is active.

9.2.15 Location updating request

This message is sent by the mobile station to the network either to request update of its location file (normal updating or periodic updating) or to request IMSI attach. See table 9.2.17/3GPP TS 24.008.

Message type: LOCATION UPDATING REQUEST

Significance: dual

Direction: mobile station to network

Table 9.2.17/3GPP TS 24.008: LOCATION UPDATING REQUEST message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	Location Updating	Message type	M	V	1
	Request message type	10.4
	Location updating type	Location updating type	M	V	1/2
		10.5.3.5
	Ciphering key sequence	Ciphering key sequence	M	V	1/2
	number	number
		10.5.1.2
	Location area	Location area	M	V	5
	identification	identification
		10.5.1.3
	Mobile station	Mobile station	M	V	1
	classmark	classmark 1
		10.5.1.5
	Mobile identity	Mobile identity	M	LV	2-9
		10.5.1.4
33	Mobile station	Mobile station	O	TLV	5
	classmark for UMTS	classmark 2
		10.5.1.6
C-	Additional update parameters	Additional update parameters	O	TV	1
		10.5.3.14
D-	Device properties	Device properties 10.5.7.8	O	TV	1
E-	MS network feature support	MS network feature support 10.5.1.15	O	TV	1

NOTE: In A/Gb mode, the maximum number of octets that can be transferred is 20.

9.2.15.1 Location area identification

The location area identification stored in the SIM/USIM is used.

9.2.15.2 Mobile Station Classmark

This IE shall include for multiband MS the Classmark 1 corresponding to the frequency band in use.

9.2.15.3 Mobile Station Classmark for Iu mode

This IE shall be included when the mobile station is in Iu mode network. The IE shall not be included when the mobile station is in A/Gb mode network.

9.2.15.4 Additional update parameters

The MS shall include this IE if, during CS fallback for a CS call, or upon request from the upper layers to set up a mobile originating "DRVCC call", the MS determines that it has to perform location updating when it enters a GERAN or UTRAN cell (see subclauses 4.5.1.1 and 4.5.1.3.4).

9.2.15.5 Device properties

This IE shall be included if the MS is configured for NAS signalling low priority.

9.2.15.6 MS network feature support

This IE shall be included if the MS supports extended periodic timer T3212 and the Additional update parameters IE is not included.

9.2.15a MM information

This message is sent by the network to the mobile station to provide the mobile station with subscriber specific information. See table 9.2.18/3GPP TS 24.008.

Message type: MM INFORMATION

Significance: dual

Direction: network to mobile station

Table 9.2.18/3GPP TS 24.008 MM INFORMATION message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	MM Information	Message type	M	V	1
	message type	10.4
43	Full name for network	Network Name	O	TLV	3-?
		10.5.3.5a
45	Short name for network	Network Name	O	TLV	3-?
		10.5.3.5a
46	Local time zone	Time Zone	O	TV	2
		10.5.3.8
47	Universal time and local time zone	Time Zone and Time	O	TV	8
		10.5.3.9
48	LSA Identity	LSA Identifier 10.5.3.11	O	TLV	2-5
49	Network Daylight Saving Time	Daylight Saving Time	O	TLV	3
		10.5.3.12

9.2.15a.1 Full name for network

This IE may be sent by the network. If this IE is sent, the contents of this IE indicate the "full length name of the network" that the network wishes the mobile station to associate with the MCC and MNC contained in the Location Area Identification of the cell to which the mobile station sent its Channel Request message.

9.2.15a.2 Short name for network

This IE may be sent by the network. If this IE is sent, the contents of this IE indicate the "abbreviated name of the network" that the network wishes the mobile station to associate with the MCC and MNC contained in the Location Area Identification of the cell to which the mobile station sent its Channel Request message.

9.2.15a.3 Local time zone

This IE may be sent by the network. The mobile station should assume that this time zone applies to the Location Area of the cell to which the Channel Request message was sent.

If the local time zone has been adjusted for Daylight Saving Time, the network shall indicate this by including the IE Network Daylight Saving Time.

9.2.15a.4 Universal time and local time zone

This IE may be sent by the network. The mobile station should assume that this time zone applies to the Location Area of the cell to which the Channel Request message was sent. The mobile station shall not assume that the time information is accurate.

If the local time zone has been adjusted for Daylight Saving Time, the network shall indicate this by including the IE Network Daylight Saving Time.

9.2.15a.5 LSA Identity

This IE may be sent by the network. The contents of this IE indicate the LSA identity of the serving cell.

9.2.15a.6 Network Daylight Saving Time

This IE may be sent by the network. If this IE is sent, the contents of this IE indicates the value that has been used to adjust the local time zone.

9.2.16 MM Status

This message is sent by the mobile station or the network at any time to report certain error conditions listed in clause 8. See table 9.2.19/3GPP TS 24.008.

Message type: MM STATUS

Significance: local

Direction: both

Table 9.2.19/3GPP TS 24.008: MM STATUS message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	MM Status message	Message type	M	V	1
	type	10.4
	Reject cause	Reject cause	M	V	1
		10.5.3.6

9.2.17 TMSI reallocation command

This message is sent by the network to the mobile station to reallocate or delete a TMSI. See table 9.2.20/3GPP TS 24.008.

Message type: TMSI REALLOCATION COMMAND

Significance: dual

Direction: network to mobile station

Table 9.2.20/3GPP TS 24.008: TMSI REALLOCATION COMMAND message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	TMSI Reallocation	Message type	M	V	1
	Command message type	10.4
	Location area	Location area	M	V	5
	identification	identification
		10.5.1.3
	Mobile identity	Mobile identity	M	LV	2-9
		10.5.1.4

9.2.18 TMSI reallocation complete

This message is sent by the mobile station to the network to indicate that reallocation or deletion of a TMSI has taken place. See table 9.2.21/3GPP TS 24.008.

Message type: TMSI REALLOCATION COMPLETE

Significance: dual

Direction: mobile station to network

Table 9.2.21/3GPP TS 24.008: TMSI REALLOCATION COMPLETE message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	TMSI Reallocation	Message type	M	V	1
	Complete message type	10.4

9.2.19 MM Null

This message is sent in mobile to network direction.

This message is not used on the radio interface. When received by the network it shall be ignored.

The introduction of this message solves interworking issues.

Message type: MM NULL

Table 9.2.22/3GPP TS 24.008 MM NULL message content

IEI	Information element	Type/Reference	Presence	Format	Length
	Mobility management	Protocol discriminator	M	V	1/2
	protocol discriminator	10.2
	Skip Indicator	Skip Indicator	M	V	1/2
		10.3.1
	MM Null message	Message type	M	V	1
	type	10.4