1 Um Interface ........................................................................................................................................................

3
1.1 Radio resources management (RR) ................................................................................ 3
1.1.1 Channel establishment messages ............................................................................ 3
LICENCIATURA EM ENGENHARIA DE SISTEMAS DE TELECOMUNICAÇÕES E ELECTRÓNICA 1.1.2 Ciphering messages ................................................................................................ 4
1.1.3 Handover messages................................................................................................. 4
Secção de Sistemas de Telecomunicações 1.1.4 Channel release messages ....................................................................................... 6
1.1.5 Paging messages ..................................................................................................... 6
1.1.6 System Information messages................................................................................. 7
1.1.7 Miscellaneous messages ......................................................................................... 9
1.2 Mobility management (MM) ........................................................................................ 11
1.2.1 Registration messages........................................................................................... 11
1.2.2 Security messages ................................................................................................. 11
1.2.3 Connection management messages....................................................................... 13
1.2.4 Miscellaneous message ......................................................................................... 13
1.3 Circuit-switched call control......................................................................................... 14
1.3.1 Call establishment messages................................................................................. 14
Sistemas de Telecomunicações III 1.3.2 Call information phase messages.......................................................................... 15
1.3.3 Call clearing messages.......................................................................................... 16
1.3.4 Messages for supplementary service control ........................................................ 17
1.3.5 Miscellaneous messages ....................................................................................... 18
2 Abis Interface .................................................................................................................................................... 19
2.1 BTS Management (BTSM) – Radio signaling link ...................................................... 19
Layer 3 GSM signaling protocols messages 2.1.1 Radio link management ........................................................................................ 19
2.1.2 Dedicated Channel Management .......................................................................... 20
2.1.3 Common channel management............................................................................. 22
2.1.4 TRX management ................................................................................................. 23
3 A Interface ......................................................................................................................................................... 24
3.1 Base Station System Application Part (BSSAP) .......................................................... 24
4 Mobile Application Part (MAP) ........................................................................................................................ 32
4.1 Mobility services........................................................................................................... 32
Um Abis A 4.1.1 Location management services ............................................................................. 32
MS BTS BSC MSC 4.1.2 Paging and search ................................................................................................. 33
4.1.3 Access management services................................................................................ 33
CM
CM II 4.1.4 Handover services................................................................................................. 33
CM
CM SS 4.1.5 Authentication management services ................................................................... 34
MM
MM MM
MM U
U
MAP 4.1.6 Security management services.............................................................................. 35
PP
BSSAP 4.1.7 International mobile equipment identities management services ......................... 35
BSSAP
BSSAP
BSSAP TCAP //
RR
RR RR’ TT 4.1.8 Subscriber management services .......................................................................... 36
RR’
RR’ BTSM
BTSM BTSM
SCCP SCCP
U
U 4.1.9 Identity management services............................................................................... 36
SCCP SCCP SCCP P P
LAPD
LAPDmm LAPD
LAPDmm LAPD
LAPD LAPD
LAPD 4.2 Call handling services ................................................................................................... 37
4.3 Short message service management services................................................................ 38
radio
radio radio
radio PCM
PCM PCM
PCM MTP
MTP MTP
MTP MTP
MTP Sources ........................................................................................................................................................................ 39
Message Index............................................................................................................................................................. 40
16/64 kbit/s 64 kbit/s /2 Mbit/s
CM – Connection Management SCCP – Signalling Connection Control Part
MM – Mobility Management TCAP – Transaction Capabilities Application Part
RR – Radio Resource management MAP – Mobile Application Part
LAPDm – Link Access Protocol on the Dm channel ISUP - ISDN User Part
BTSM – BTS Management TUP – Telephony User Part
BSSAP - Base Station System Application Part MTP – Message Transfer Part

Sistemas de Telecomunicações III 1/41 Sistemas de Telecomunicações III 2/41

 1.1.2 Ciphering messages
1 Um Interface
Message Description Origin Dest. Message Contents
1.1 Radio resources management (RR)
This message is sent on the
main DCCH from the network
1.1.1 Channel establishment messages to the mobile station to Cipher Mode Command
indicate that the network has message type
CIPHERING MODE started deciphering and that
Network MS Ciphering mode setting
Message Description Origin Dest. Message Contents COMMAND enciphering and deciphering
shall be started in the mobile Cipher response
This message is sent on the station, or to indicate that
main DCCH by the network Channel Description ciphering will not be
to the mobile station to performed.
ADDITIONAL Mobile Allocation
allocate an additional Network MS
ASSIGNMENT dedicated channel while Starting Time
This message is sent on the
keeping the previously main DCCH from the mobile Cipher mode complete
allocated channels. CIPHERING MODE station to the network to Message type
indicate that enciphering MS Network
Immediate assignment COMPLETE Mobile equipment identity
and deciphering has been
message type started in the mobile station.
Page mode
This message is sent on the Spare half octet
CCCH by the network to the Channel description
mobile station in idle mode to
IMMEDIATE Request reference
ASSIGNMENT
change the channel Network MS
Timing advance 1.1.3 Handover messages
configuration to a dedicated
configuration while staying in Mobile allocation
the same cell. Starting time
IA Rest octets (frequency Message Description Origin Dest. Message Contents
parameters, before time) Description of the first
channel, after time
Immediate assignment Power command
Extended message type Frequency list, after time
Page mode Cell channel description
This message is sent on the Spare Half octet Mode of the first channel
CCCH by the network to two Channel description 1 This message is sent on the Description of the second
mobile stations in idle mode main DCCH by the network channel, after time
IMMEDIATE Request reference 1
to change their to the mobile station to Mode of the second channel
ASSIGNMENT channel configurations to
Network MS Timing advance 1 change the channel
EXTENDED Channel description 2 ASSIGNMENT Mobile allocation, after time
different dedicated configuration to another Network MS
Request reference 2 COMMAND independent dedicated Starting time
configurations while they stay
in the same cell. Timing advance 2 channel configuration, when Frequency Llist, before time
Mobile allocation no timing adjustment is Description of the first
Starting time needed channel, before time
IAX rest octets Description of the
second channel, before time
Immediate assignment Frequency channel
reject message type Sequence before time
Page mode Mobile allocation, before time
Spare half octet Cipher mode setting
This message is sent on the Request reference 1
IMMEDIATE CCCH by the network to up Wait indication 1 This message is sent on the
ASSIGNMENT to four mobile stations to Network MS Request reference 2 main DCCH from the mobile Assignment complete
indicate that no channel is ASSIGNMENT station to the network to
REJECT Wait indication 2 message type
available for assignment. COMPLETE indicate that the mobile MS Network
Request reference 3 station has established the RR cause
Wait indication 3 main signalling link
Request reference 4 successfully.
Wait indication 4
IAR rest octets

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 This message is sent on the
main DCCH on the old Assignment failure message This message is sent on the Physical Information Message
ASSIGNMENT channel from the mobile main DCCH by the network
type PHYSICAL Type
FAILURE station to the network to MS Network to the mobile station to stop Network Mobile
indicate that the mobile RR cause INFORMATION the sending of access bursts Timing advance
station has failed to seize the from the mobile station.
new channel.

This message is sent in

HANDOVER random mode on the main
ACCESS DCCH during a handover Network MS Handover Reference 1.1.4 Channel release messages
procedure. It does not follow
the basic format.

Handover command message Message Description Origin Dest. Message Contents

type
Cell description This message is sent on the
Description of the first Channel release message
main DCCH from the network
channel, after time type
CHANNEL RELEASE to the mobile station to Network MS
Handover reference initiate deactivation of RR cause
Power command and type the dedicated channel used. BA range
Synchronization indication
Frequency short list, after time
Frequency list, after time This message is sent on the
Cell channel description main DCCH by the network
Mode of the first channel Partial release message type
PARTIAL RELEASE to the mobile station to Network MS
Description of the deactivate part of the Channel description
This message is sent on the second channel, after time dedicated channels in use.
main DCCH by the network Mode of the second channel
HANDOVER to the mobile station to Frequency channel This message is sent on the
Network MS
COMMAND change the dedicated Sequence, after time main DCCH by the mobile
channel configuration, timing Mobile allocation, after time Partial release complete
PARTIAL RELEASE station to the network to
adjustment needed. Starting time indicate that a part of the
MS Network message type
COMPLETE
Real time difference dedicated channels has been
Timing advance deactivated.
Frequency short list, before
time
Frequency list, before time
Description of the first 1.1.5 Paging messages
channel, before time
Description of the second
channel, before time Message Description Origin Dest. Message Contents
Frequency channel sequence Paging request type
before time Message type
Mobile allocation, before time This message is sent on the
CCCH by the network to up Page mode
Cipher mode setting Channels needed for mobiles
to two mobile stations to
PAGING REQUEST
This message is sent on the trigger channel access by Network MS 1 and 2
Handover complete message TYPE 1 these. The mobile stations
main DCCH from the mobile Mobile identity 1
station to the network to type are identified by their TMSI or Mobile identity 2
HANDOVER IMSI.
indicate that the mobile MS Network RR cause P1 rest octets
COMPLETE station has established the Mobile observed time
main signalling link Difference
successfully. This message is sent on the Paging request type 2
CCCH by the network to two Message type
This message is sent on the Page mode
or three mobile stations to
main DCCH on the old Handover Failure Message trigger channel access by Channels needed for mobiles
HANDOVER channel from the mobile
Type PAGING REQUEST these. Two of the mobile
station to the network to MS Network Network MS 1 and 2
FAILURE RR Cause TYPE 2 stations are identified by their
indicate that the mobile Mobile identity 1
TMSI while the third is Mobile identity 2
station has failed to seize the
identified by its TMSI or IMSI. Mobile identity 3
new channel.
P2 rest octets

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 Paging request type 3 1 800 band
message type may ignore this message.
This message is sent on the Page mode
CCCH by the network to four Channels needed for System information type 3
PAGING REQUEST mobile stations to trigger mobiles 1 and 2 This message is sent on the message type
channel access by these.
Network MS Cell identity
TYPE 3 Mobile identity 1 SYSTEM BCCH by the network giving
The mobile stations are Location area identification
Mobile identity 2 INFORMATION TYPE information of control on the
identified by their TMSIs. Mobile identity 3 RACH, the location area Network MS Control channel description
3 identification, the cell identity
Mobile identity 4 Cell options
and various other information Cell selection parameters
P3 rest octets about the cell. RACH control parameters
This message is sent on the Paging response message SI 3 rest octets
main DCCH by the mobile type
station to the network in Ciphering key sequence System information type 4
connection with This message is sent on the message type
PAGING RESPONSE establishment of the main MS Network number BCCH by the network giving
Spare half octet Location area identification
signalling link as a response SYSTEM information on control of the
Mobile station classmark Cell selection parameters
to the paging request INFORMATION TYPE RACH, the location area Network MS
Mobile identity identification, the cell identity RACH control parameters
message. 4
and various other information CBCH channel description
about the cell. CBCH mobile allocation
SI 4 rest octets
1.1.6 System Information messages This message is sent on the
SACCH by the network to
mobile stations within the cell
Message Description Origin Dest. Message Contents giving information on
the BCCH allocation in the
neighbour cells. When
This message is sent on the System information type 1 received this information shall
SYSTEM BCCH by the network to all message type System information type 5
SYSTEM be used as the list of BCCH
mobile stations within the cell
INFORMATION TYPE giving information of control
Network MS Cell channel description frequencies of the message type
INFORMATION TYPE neighbouring cells to Network MS
1 of the RACH and of the cell RACH control parameter BCCH frequency list
5 be reported on. Any change
allocation. SI 1 rest octets
in the neighbour cells
description must overwrite
This message is sent on the System information any old data held by the
BCCH by the network to all type 2 message type mobile station. The mobile
SYSTEM mobile stations within the cell station must analyse all
BCCH frequency list
INFORMATION TYPE giving information of control Network MS correctly received system
of the RACH and of the NCC permitted
2 information type 5 messages.
BCCH allocation in the RACH control parameter
neighbour cells. This message is sent
optionally on the SACCH by
This message is sent the network to mobile
optionally on the BCCH by stations within the cell giving
the network to all mobile System information type 2bis information on the extension
stations within the cell giving message type of the BCCH allocation in the
SYSTEM information on control of the neighbour cells. A GSM 900
Extended BCCH
INFORMATION TYPE RACH and of the extension mobile station which only
of the BCCH allocation in the
Network MS Frequency list
2bis supports the primary GSM
neighbour cells A GSM 900 RACH control parameters band P-GSM 900 may
mobile station which only SI 2bis rest octets ignore this message. When System information type 5 bis
SYSTEM
supports the primary GSM message type
band P-GSM 900 may ignore INFORMATION TYPE received (and not ignored)
this information must be used Network MS Extension of the BCCH
this message. 5bis as the list of neighbouring Frequency list description
cells to be
This message is sent
reported on. Any change in
optionally on the BCCH by
System information type 2ter the neighbour cells
the network to all mobile
message type description must overwrite
SYSTEM stations within the cell giving
any old data held by the
information on the extension Extended BCCH
INFORMATION TYPE of the BCCH allocation in the Network MS mobile station. The mobile
Frequency list station must, with the
2ter neighbour cells. A mobile SI 2ter rest octets exception stated above,
station that supports either:
analyse all correctly received
only the primary GSM band
system information type 5
P-GSM 900, or only the DCS
messages.

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 This message is sent This message is sent on the
optionally on the SACCH by main DCCH by the mobile Channel mode modify ack-
CHANNEL MODE
the network to mobile station to the network to nowledge message type
stations within the cell giving MODIFY indicate the successful or MS Network Channel description
information on the extension ACKNOWLEDGE unsuccessful execution of a Channel mode
of the BCCH allocation in the channel mode modify
neighbour cells. A mobile request.
station that supports either:
only the primary GSM band This message is sent in
P-GSM 900 or random mode on the RACH.
only the DCS 1 800 band CHANNEL It does not follow the basic ESTABLISHMENT CAUSE
may ignore this message, System information type 5ter REQUEST format. The possible formats Network MS RANDOM REFERENCE
SYSTEM
When received (and not message type are presented directly below,
INFORMATION TYPE ignored) this information must Network MS without reference to
Extended BCCH frequency list
5ter be used as part of the list of information fields.
neighbouring cells to be
reported on. Any change in This message is sent on the
the neighbour cells Classmark change
CLASSMARK main DCCH by the mobile message type
description must overwrite station to the network to
this part of any old data held CHANGE indicate a classmark change
MS Network Mobile station classmark
by the mobile station. The or as a response to a Additional mobile station
mobile station shall, with the classmark enquiry. classmark information
exception stated above,
analyse all correctly
This message is sent on the
received system information CLASSMARK main DCCH by the network
type 5ter messages. Classmark enquiry message
ENQUIRY to the mobile station to Network MS
request classmark type
This message is sent on the System information type 6
SACCH by the network to information.
Message type
SYSTEM mobile stations within the cell
Cell identity This message is sent on the Frequency redefinition
INFORMATION TYPE giving information of location Network MS
main DCCH from the network
area identification, of cell Location area identification message type
6 to the mobile station to
identity and various other Cell options FREQUENCY Channel description
information. NCC permitted indicate that the frequencies Network MS
REDEFINITION and the hopping sequence of Mobile allocation
the allocated channels shall Starting time
This message is sent on the System information type 7 be changed. Cell channel description
SYSTEM BCCH by the network giving
message type
INFORMATION TYPE information about cell Network MS This message is sent on the
reselection parameters to be SI 7 rest octets SACCH by the mobile station Measurement report message
7 MEASUREMENT
used in that cell. to the network to report type
REPORT measurement results about
MS Network
Measurement results
the dedicated channel and
This message is sent on the System information type 8
SYSTEM about neighbour cells.
BCCH by the network giving
message type
INFORMATION TYPE information about cell Network MS This message is sent by the
reselection parameters to be SI 8 rest octets RR status
8 RR STATUS mobile station or the network
used in that cell. at any time to report certain
Both Both Message type
error conditions. RR cause

This message is sent on the

SCH, which is one of the
SYNCHRONIZATION broadcast channels. Its BSIC
CHANNEL purpose is to support the T1
Network MS
1.1.7 Miscellaneous messages INFORMATION synchronization of a mobile T2
station to a BSS. It T3
does not follow the basic
format.
Message Description Origin Dest. Message Contents

This message is sent on the

main DCCH by the network Channel mode modify
CHANNEL MODE to the mobile station to message type
request the setting of the
Network MS
MODIFY Channel description
mode for the indicated Channel mode
channel.

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1.2 Mobility management (MM) This message is sent by the Identity Request
network to the mobile station
message type
IDENTITY REQUEST to request a mobile station Network MS
1.2.1 Registration messages to submit the specified Identity type
identity to the network. Spare half octet

Message Description Origin Dest. Message Contents This message is sent by the
mobile station to the network Identity Response message
This message is sent IMSI Detach Indication IDENTITY in response to an IDENTITY
by the mobile station to REQUEST message
MS Network type
message type RESPONSE
IMSI DETACH INDICATION the network to set a MS Network providing the requested Mobile identity
deactivation indication Mobile station classmark
Mobile identity identity.
in the network.
This message is sent This message is sent by the TMSI Reallocation
TMSI
by the network to the Location Updating network to the mobile station Command message type
REALLOCATION to reallocate or delete a
Network MS
mobile station to Accept message type Location area identification
COMMAND TMSI.
LOCATION UPDATING ACCEPT indicate that updating Network MS Location area identification Mobile identity
or IMSI attach in the Mobile identity This message is sent by the
network has been Follow on proceed mobile station to the network
completed. TMSI TMSI Reallocation
to indicate that reallocation
REALLOCATION or deletion of a TMSI has MS Network Complete message type
This message is sent COMPLETE taken place.
by the network to the Location Updating
mobile station to Reject message type
LOCATION UPDATING REJECT indicate that updating
Network MS
Reject cause
or IMSI attach has
failed.

This message is sent Location Updating

by the mobile station to Request message type
the network either to Location updating type
request update of its Ciphering key sequence
LOCATION UPDATING REQUEST location file MS Network
number
(normal updating or Location area identification
periodic updating) or to Mobile station classmark
request IMSI attach. Mobile identity

1.2.2 Security messages

Message Description Origin Dest. Message Contents

This message is sent by the
network to the mobile station
to indicate that
AUTHENTICATION Authentication Reject
authentication has failed Network MS
REJECT (and that the receiving message type
mobile station shall abort all
activities).
Authentication Request
This message is sent by the message type
AUTHENTICATION network to the mobile station Ciphering key sequence
REQUEST to initiate authentication of Network MS number
the mobile station Spare half octet
identity. Authentication parameter
RAND
This message is sent by the Authentication Response
AUTHENTICATION mobile station to the network message type
to deliver a calculated
MS Network
RESPONSE Authentication parameter
response to the network. SRES

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1.2.3 Connection management messages 1.3 Circuit-switched call control
Message Description Origin Dest. Message Contents
1.3.1 Call establishment messages
CM Re-Establishment
Request message
This message is sent by the Ciphering key sequence
CM RE- mobile station to the network Message Description Origin Dest. Message Contents
number
ESTABLISHMENT to request re-establishment MS Network Alerting
of a connection if the Spare half octet
REQUEST message type
previous one has failed. Mobile station classmark
Mobile identity This message is sent by the Network MS Facility
Location area identification network to the calling mobile Progress indicator
This message is sent by the
ALERTING station to indicate that the User-user
called user alerting has Alerting message type
network to the mobile station
CM SERVICE CM Service Accept message been initiated. Facility
to indicate that the Network MS MS Network
ACCEPT requested service has been type User-user
accepted. SS version
This message is sent by the Call confirmed message type
network to the mobile station CM Service Reject message This message is sent by the Repeat Indicator
CM SERVICE
to indicate that the Network MS type called mobile station to Bearer capability
REJECT requested service cannot CALL CONFIRMED confirm an incoming call
MS Network
Reject cause Bearer capability
provided. request. Cause
This message is sent by the CC Capabilities
mobile station to the network This message is sent by the Call proceeding
to request the abortion of network to the calling mobile message type
CM Service Abort station to indicate that the
CM SERVICE ABORT the first MM connection MS Network Repeat Indicator
establishment in progress message type requested call establishment
CALL PROCEEDING information has been
Network MS Bearer capability 1
and the release of the RR
connection. received, and no more call Bearer capability 2
establishment information Facility
This message is sent by the will be accepted. Progress indicator
network to the mobile station Connect
to initiate the abortion of all Abort message type message type
ABORT MM connections and to
Network MS
Reject cause Facility
indicate the reason for the
abortion.
Network MS Progress indicator
This message is sent by the Connected number
This message is sent by the network to the calling mobile Connected subaddress
mobile station to the network CM Service Request CONNECT station to indicate call User-user
to request a service for the message type acceptance by the called Connect
connection management CM service type user.
CM SERVICE sublayer entities, e.g. circuit message type
switched connection
MS Network Ciphering key sequence Facility
REQUEST MS Network
establishment, number Connected subaddress
supplementary services Mobile station classmark User-user
activation, short message Mobile identity SS version
transfer. This message is sent by the
network to the called mobile
station to indicate that the
mobile station has been
1.2.4 Miscellaneous message CONNECT Connect acknowledge
awarded the call. It shall Both Both
ACKNOWLEDGE also be sent by the calling message type
mobile station to the network
Message Description Origin Dest. Message Contents to acknowledge the offered
This message is sent by connection.
MM Status message This message is sent from
the mobile station or the Emergency setup
type the mobile station to initiate
MM STATUS network at any time to Both Both EMERGENCY SETUP MS Network message type
Reject cause emergency call
report certain error Bearer capability
conditions. establishment.
This message is sent from
the network to the mobile Progress
station to indicate the message type
PROGRESS progress of a call in the
Network MS
Progress indicator
event of interworking or in User-user
connection with the

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 provision of in-band This message is sent by the
information/patterns. Modify complete message
mobile station to the network type
Setup message type or by the network to the
Bearer capability
BC repeat indicator MODIFY COMPLETE mobile station to Both Both
indicate completion of a Low layer comp.
Bearer capability 1 request to change bearer High layer comp.
Bearer capability 2 capability for a call. Reverse call setup Direction
Facility
Progress indicator This message is sent by the Modify reject
mobile station to the network message type
Signal or by the network to the
This message is sent by the Calling party BCD number Bearer capability
network to the mobile station MODIFY REJECT mobile station to Both Both
Calling party sub-Address indicate failure of a request Cause
to initiate a mobile Network MS Low layer comp.
terminated call Called party BCD number to change the bearer
establishment. Called party sub- address capability for a call. High layer comp.
LLC repeat indicator This message is sent by the
Low layer compatibility I mobile station to the network
Low layer compatibility II to transfer information to the User Information
HLC repeat indicator remote user. This message
message type
High layer compatibility i USER INFORMATION is also sent by the network Both Both
to the mobile station to User-user
High layer compatibility ii deliver information More data
User-user transferred from the remote
SETUP Setup message type user.
BC repeat indicator
Bearer capability 1
Bearer capability 2
Facility
Calling party sub- address 1.3.3 Call clearing messages
Called party BCD number
This message is sent from Called party sub-address
the mobile station to the LLC repeat indicator Message Description Origin Dest. Message Contents
network to initiate a mobile MS Network Low layer compatibility I Disconnect message
originating call Low layer compatibility II type
establishment. HLC repeat indicator This message is sent by the
Cause
High layer compatibility i DISCONNECT network to indicate that the end-to- Network MS
end connection is cleared. Facility
High layer compatibility ii Progress indicator
User-user User-user
SS version
CLIR suppression This message is sent, from the
network to the mobile station to Release
CLIR invocation
indicate that the network intends to message type
CC capabilities release
Cause
the transaction identifier, and that Network MS
the receiving equipment shall Second cause
release the transaction identifier Facility
after sending RELEASE User-user
1.3.2 Call information phase messages RELEASE COMPLETE.

This message is sent from the

Message Description Origin Dest. Message Contents mobile station to the network to Release message type
indicate that the mobile station Cause
This message is sent by the intends to release the transaction Second cause
Modify message type identifier, and that the receiving
MS Network
mobile station to the network Facility
Bearer capability equipment shall release the
or by the network to the User-user
MODIFY mobile station to
Both Both Low layer comp. transaction identifier after sending SS version
request a change in bearer High layer comp. RELEASE COMPLETE.
capability for a call. Reverse call setup direction
This message is sent from the Release complete
network to the mobile station to message type
RELEASE indicate that the network has
Network MS Cause
COMPLETE released the transaction identifier
and that the mobile station shall Facility
release the transaction identifier. User-user

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 This message is sent from the Release complete 1.3.5 Miscellaneous messages
mobile station to the network to message type
Message Description Origin Dest. Message Contents
indicate that the mobile station has Cause
released the transaction identifier
MS Network
Facility This message is sent by the
and that the network shall release User-user mobile station or the Congestion control message
the transaction identifier. SS version network to indicate the type
CONGESTION
establishment or termination Both Both Congestion level
CONTROL of flow control on the Spare half octet
1.3.4 Messages for supplementary service control transmission of USER Cause
INFORMATION messages.

This message is sent either

Message Description Origin Dest. Message Contents from the mobile station or
from the network to indicate Notify message type
This message is sent by the NOTIFY information pertaining
Both Both
network to the mobile station Notification indicator
to a call, such as user
to request or acknowledge a
Facility suspended.
supplementary service. The
supplementary service to be Network MS message type This message is sent by the
invoked and its associated Facility mobile station to the network
parameters are specified in and contains the digit the Start DTMF
the facility information network should reconvert
element.
START DTMF back into a DTMF tone
MS Network message type
FACILITY Keypad facility
This message is sent by the which is then applied
mobile station to the network towards the remote user.
to request or acknowledge a Facility
supplementary service. The This message is sent by the
message type
supplementary service to be MS Network network to the mobile station
invoked and its associated Facility to indicate the successful
parameters are specified in SS version initiation of the action Start DTMF acknowledge
START DTMF
the facility information requested by the START Network MS message type
element. ACKNOWLEDGE DTMF message (conversion Keypad facility
This message is sent by the of the digit contained in this
mobile user to request the message into a DTMF
HOLD hold function for an existing
MS Network Hold message type tone).
call. This message is sent by the
This message is sent by the network to the mobile Start DTMF reject
START DTMF
HOLD network to indicate that the Hold Acknowledge station, if the network can Network MS message type
hold function has been
Network MS REJECT not accept the START
ACKNOWLEDGE message type Cause
successfully performed. DTMF message.
This message is sent by the This message is sent by the
network to indicate the Hold Reject message type mobile station or the Status
HOLD REJECT denial of a request to hold a
Network MS network at any time during a
Cause message type
call. call to report certain error
STATUS conditions listed in clause 8.
Both Both Cause
This message is sent by the
RETRIEVE mobile user to request the MS Network Retrieve message type It shall also be sent in Call state
retrieval of a held call. response to a STATUS Auxiliary states
This message is sent by the ENQUIRY message.
RETRIEVE network to indicate that the Retrieve Acknowledge This message is sent by the
retrieve function has been
Network MS mobile station or the
ACKNOWLEDGE message type
successfully performed. network at any time to solicit
This message is sent by the a STATUS message from
network to indicate the Retrieve Reject message type STATUS ENQUIRY the peer layer 3 entity. Both Both Status enquiry message type
RETRIEVE REJECT inability to perform the
Network MS Sending of STATUS
Cause
requested retrieve function. message in response to a
STATUS ENQUIRY
message is mandatory.
This message is sent by a
mobile station to the network
STOP DTMF and is used to stop the MS Network Stop DTMF message type
DTMF tone sent towards
the remote user.
This message is sent by the
network to the mobile station Stop DTMF acknowledge
STOP DTMF
to indicate that the sending Network MS message type
ACKNOWLEDGE of the DTMF tone
has been stopped.

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 This message is sent from
2 Abis Interface RELEASE BTS to BSC to indicate the
Channel number
release of a radio link layer BTS BSC
INDICATION Link Identifier
connection (initiated by
2.1 BTS Management (BTSM) – Radio signaling link MS).

2.1.1 Radio link management This message is sent from

BSC to BTS to request the Channel number
UNIT DATA
sending of a message in BSC BTS Link Identifier
Message Description Origin Dest. Message Contents REQUEST unacknowledged mode on a L3 Information
radio link layer connection.
This message is sent from
BSC to BTS to request the Channel number This message is sent from
DATA REQUEST sending of a message in BSC BTS Link Identifier BTS to BSC to indicate the
Channel number
acknowledged mode on a L3 Information UNIT DATA reception of a message in
BSC BTS Link Identifier
radio link layer connection. INDICATION unacknowledged mode
L3 Information
on a radio link layer
This message is sent from connection.
BTS to BSC to indicate the Channel number
DATA INDICATION reception of a message in BTS BSC Link Identifier
acknowledged mode on a L3 Information
radio link layer connection. 2.1.2 Dedicated Channel Management

This message is sent from

Channel number Message Description Origin Dest. Message Contents
BTS to BSC to indicate an
ERROR INDICATION abnormal case for a radio link BTS BSC Link Identifier
RLM Cause Channel number
layer connection.
Activation Type
Channel Mode
This message is sent from Channel Identification
BSC to BTS to request the This message is sent from
Encryption information
ESTABLISH establishment of a multi- Channel number BSC to BTS in order to
Handover Reference
BSC BTS CHANNEL activate a radio channel. The
REQUEST frame mode (acknowledged Link Identifier BSC BTS BS Power
mode) link layer connection ACTIVATION attributes of the channel
MS Power
on the radio path. are defined in the message.
Timing Advance
BS Power Parameters
This message is sent from MS Power Parameters
BTS to BSC to confirm the Physical Context
ESTABLISH establishment of a radio link Channel number SACCH Information
BTS BSC
CONFIRM layer connection in Link Identifier
multi-frame (acknowledged)
mode. This message is sent from
CHANNEL BSC to BTS to acknowledge
Channel number
This message is sent from
ACTIVATION that the requested channel BTS BSC
Frame number
ACKNOWLEDGE activation has been
BTS to BSC to indicate the
Channel number completed correctly.
ESTABLISH establishment of a radio link
BTS BSC Link Identifier
INDICATION layer connection in
L3 Information
multi-frame mode, initiated by
This message is sent from
an MS. CHANNEL BTS to BSC to indicate that
Channel number
ACTIVATION the channel activation could BTS BSC
Cause
This message is sent from NEGATIVE ACK not be performed as
BSC to BTS to request the Channel number requested.
RELEASE REQUEST release of multi-frame mode BSC BTS Link Identifier
of a radio link layer Release Mode
This message is sent from
connection.
BTS to BSC to indicate that
CONNECTION Channel number
an active connection has BTS BSC
FAILURE Cause
been broken for some
This message is sent from
reason.
RELEASE CONFIRM BTS to BSC to confirm the Channel number
release of multi-frame mode BTS BSC
Link Identifier This message is sent from
of a radio link layer
connection. DEACTIVATE BSC to BTS in order to
BSC BTS Channel number
SACCH deactivate the SACCH of an
active channel.

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 Channel number 2.1.3 Common channel management
This message is sent from
ENCRYPTION Encryption information
BSC to BTS to start ciphering BSC BTS
COMMAND Link Identifier
mode operation.
L3 Info (CIPH MOD CMD) Message Description Origin Dest. Message Contents

This message is sent from This message is sent from Channel number
BTS to BSC when BTS BCCH BSC to BTS to indicate new System Info Type
HANDOVER Channel number BSC BTS
correctly receives information BTS BSC INFORMATION information to be broadcast Full BCCH Info (SYS INFO)
DETECTION Access Delay
from an MS on the handover on BCCH. Starting Time
activated channel.
This message is sent from
This message from BTS to BTS to BSC to report the
BSC is used to report to BSC Channel number Channel number
CCCH LOAD current load on the indicated
the results of radio channel Measurement result number BTS BSC RACH Load
INDICATION CCCH timeslot (random
measurements Uplink Measurements Paging Load
MEASUREMENT access, RACH, and paging,
made by BTS (uplink) and to BTS BSC BS Power PCH).
RESULT convey the measurement L1 Information
reports from MS received on L3 Info (MEAS REP)
SACCH and in the L1 MS Timing Offset This message is sent from
Channel number
headers. BTS to BSC to indicate the
Request Reference
CHANNEL reception of a CHANnel
BTS BSC Access Delay
REQUIRED REQuest message
This message is sent from Physical Context
(special access burst
MODE MODIFY BSC to BTS to request a Channel number message) from an MS.
BSC BTS
REQUEST change of channel mode of Channel Mode
an active channel.
This message is sent from
This message is sent from BTS to BSC to indicate the
MODE MODIFY BTS to BSC to confirm the DELETE deletion of an access grant Channel number
BTS BSC Channel number BTS BSC
change of channel mode of INDICATION message (IMMediate Full Imm. Assign Info
ACKNOWLEDGE
an active channel. ASSIGN) due to overload of
downlink CCCH.
This message is sent from
MODE MODIFY BTS to BSC to indicate that Channel number
Channel number This message is sent from
NEGATIVE the channel mode BTS BSC
Cause Paging Group
ACKNOWLEDGE modification could not be PAGING COMMAND BSC to BTS to request the BSC BTS
MS Identity
performed as requested. paging of an MS.
Channel Needed

This message is sent from

RF CHANNEL BSC to BTS to inform that a This message is sent from
BSC BTS Channel number
RELEASE radio channel is no longer
needed. IMMEDIATE ASSIGN BSC to BTS to request the Channel number
transmission of an immediate BSC BTS
COMMAND Full Imm. Assign Info
assignment
This message is sent from message.
RF CHANNEL
BTS to BSC as an
RELEASE acknowledge to a RF
BTS BSC Channel number
ACKNOWLEDGE CHANnel RELease message. This message is sent from
BSC to BTS to request the
SMS BROADCAST Channel number
sending of a Short Message BSC BTS
This message is sent from REQUEST SMSCB Information
Service Cell Broadcast
BSC to BTS to change the Channel number message.
MS POWER
MS power level or the BSC BTS MS Power
CONTROL parameters used by TRX to MS Power Parameters
control the MS power. This message is sent from
Channel number
SMS BROADCAST BSC to BTS to command
This message is sent from BSC BTS CB Command type
COMMAND Short Message Service Cell
BSC to BTS to change the SMSCB message
Channel number Broadcast.
BS POWER TRX transmission power
BSC BTS BS Power
CONTROL level or the parameters
BS Power Parameters
used by TRX to control its
transmission power.

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2.1.4 TRX management
3 A Interface
Message Description Origin Dest. Message Contents
3.1 Base Station System Application Part (BSSAP)
This message is sent from
RF RESOURCE BTS to BSC to indicate the
BSC BTS Resource Information Message Description Origin Dest. Message Contents
INDICATION interference level on idle
channels of a TRX. This message is sent from Channel type
the MSC to the BSS via the Layer 3 header information
This message is sent from relevant SCCP connection in
Priority
BSC to BTS to indicate the ASSIGNMENT order to request the
System Info Type BSS to assign radio
MSC BSS Circuit identity code
new broadcast information to REQUEST
SACCH FILLING be used as filling
BTS BSC L3 Info (SYS INFO) resource, the attributes of Downlink DTX flag
Starting Time which are defined within the Interference band to be used
information on downlink
SACCH. message. Classmark information 2

This message is sent from The ASSIGNMENT

BTS to BSC to indicate an RR cause
COMPLETE message is sent Cell identifier
overload situation. Possible ASSIGNMENT from the BSS to the MSC and
OVERLOAD cause values include: BTS BSC Cause indicates that the requested
BSS MSC Chosen channel
COMPLETE
- CCCH overload, assignment has been Chosen encryption algorithm
- ACCH overload, completed correctly. Circuit pool
- processor overload.
The ASSIGNMENT FAILURE
This message is sent from Cause message is sent from the
BTS to BSC to report a Message Identifier BSS to the MSC via the
ERROR REPORT detected error which cannot BTS BSC Channel Number relevant SCCP
be reported in any other Link identifier RR cause
ASSIGNMENT connection. It indicates that
message. Erroneous Message there has been a failure in
BSS MSC Circuit pool
FAILURE
the assignment process at Circuit pool list
the BSS and that the
assignment procedure has
been aborted.
This message is sent from
the BSS to the MSC to
indicate that a particular
terrestrial resource (i.e. a
particular timeslot within a
Circuit identity code
BLOCK 2Mbit system) must be BSS MSC
blocked at the MSC, and Cause
cannot therefore be used for
traffic. This message is sent
as a connectionless SCCP
message.
This message is sent from
the MSC to the BSS to
acknowledge the receipt of
an earlier BLOCK message,
BLOCKING and to indicate that the circuit
concerned has been
MSC BSS Circuit identity code
ACKNOWLEDGE
removed from service. This
message is sent as a
connectionless SCCP
message.
This message is sent from
the BSS to the MSC to
indicate that a particular
terrestrial resource (ie a
UNBLOCK particular timeslot within a
BSS MSC Circuit identity code
2Mbit system) may be
returned to service at the
MSC, and can therefore be

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 used for traffic. This message
is sent as a connectionless This message is sent from
SCCP message. the BSS to the MSC via the
HANDOVER relevant SCCP connection. It
This message is sent from indicates that the correct MS
BSS MSC RR cause
COMPLETE
the MSC to the BSS to has successfully accessed
acknowledge the receipt of the target cell.
an earlier UNBLOCK
UNBLOCKING message, and to indicate that
the circuit concerned has
MSC BSS Circuit identity code
ACKNOWLEDGE HANDOVER This message is sent from
Number of MSs
been returned to service. the MSC to the BSS, using
This message is sent as a CANDIDATE the connectionless services MSC BSS Cell identifier list
connectionless SCCP ENQUIRE of the SCCP. Cell identifier
message.
Channel type This message is sent from
Encryption information the BSS to the MSC in
Classmark information 1 or response to receipt of a
Classmark information 2 HANDOVER HANDOVER CANDIDATE
This message is sent from ENQUIRE message. It
Priority CANDIDATE Number of MSs
the MSC to the BSS via the contains the number of MSs BSS MSC
HANDOVER Circuit identity code RESPONSE for which HANDOVER Cell identifier
relevant SCCP connection to MSC BSS
REQUEST indicate that the MS is to be Downlink DTX flag REQUIRED messages have
handed over to that BSS. Cell identifier (target) been sent.This message is
Interference band to be used sent as a connectionless
Cause SCCP message.
Classmark information 3 This message is sent from
Current Channel the BSS to the MSC via the
This message is sent from relevant SCCP connection. It Cause
the BSS to the MSC to indicates to the MSC that
HANDOVER RR cause
indicate that for a given MS there has been a failure in BSS MSC
FAILURE the resource allocation Circuit pool
which already has a Cause Circuit pool list
dedicated radio resource process on handover, and
Response request that the handover has
HANDOVER assigned, a handover is
required for the reason given
BSS MSC Cell identifier list (preferred) been aborted.
REQUIRED
by the cause element. The Circuit pool list
This message is sent from
message is sent via the Current channel
the MSC to the BSS and
BSSAP SCCP connection requests the current spare
associated with the dedicated Periodicity
and optionally the total
resource. RESOURCE Resource indication method
accessible resource on a MSC BSS
REQUEST particular cell. Cell identifier
This message is sent from Extended Resource Indicator
the BSS to the MSC and This message is sent as a
indicates that the request to connectionless SCCP
support a handover at the message.
target BSS can be supported Layer 3 information This message is sent from
HANDOVER
by the BSS, and also to Chosen channel the BSS to the MSC in
REQUEST which radio channel the MS
BSS MSC
Chosen encryption algorithm response to a resource
ACKNOWLEDGE should be directed. The Resource indication method
Circuit pool request message, the
message is sent via the RESOURCE Resource available
message includes an explicit BSS MSC
BSSAP SCCP connection INDICATION indication of the cell Cell identifier
associated with the dedicated concerned. This message is Total resource acessible
resource. sent as a connectionless
SCCP message.
This message is sent from
the MSC to the BSS via the This message is sent from
HANDOVER relevant SCCP connection Layer 3 information the MSC to the BSS and
MSC BSS contains sufficient information
COMMAND and contains the target Cell identifier IMSI
channel to which the MS to allow the paging message
TMSI
should retune. PAGING to be transmitted by the MSC BSS
correct cells at the correct Cell identifier list
time. This message is sent as Channel needed
a connectionless SCCP
message.

Sistemas de Telecomunicações III 25/41 Sistemas de Telecomunicações III 26/41

 This message is sent from This message is sent from
the BSS to the MSC to the BSS to the MSC or from
indicate to the MSC that the the MSC to the BSS. When
BSS wishes to release the sent from the BSS tothe MSC
CLEAR REQUEST associated dedicated BSS MSC Cause it indicates either processor
resource. The message is overload of the whole BSS
sent via the BSSAP SCCP (cell identifier field not Cause
connection associated with
OVERLOAD present) or overload of a
BSS MSC
Cell identifier
the dedicated resource. CCCH downlink in which
case the relevant cell is
This message is sent from identified.
the MSC to the BSS to This message is sent as a
instruct the BSS to release connectionless SCCP
the associated dedicated Layer 3 header information message.
CLEAR COMMAND resource. The message is
MSC BSS
Cause
sent via the BSSAP SCCP This message is sent from
connection associated with the MSC to the BSS in order Trace type
the dedicated resource. to start production of a trace Trigger Id
MSC INVOKE record at the BSS. The Trace reference
This message is sent from MSC BSS
TRACE message is sent via the Transaction Id
the BSS to the MSC to inform BSSAP SCCP connection
the MSC that the associated Mobile Identity
associated with the dedicated OMC Id
dedicated resource has been resource.
CLEAR COMPLETE successfully cleared. BSS MSC
The message is sent via the This message is sent from
BSSAP SCCP connection the BSS to the MSC in order
associated with the dedicated to start production of a trace Trace type
resource. record at the MSC Forward Indicator
and/or from the MSC to BSS Trigger Id
This message can be sent BSS INVOKE TRACE to target BSSs after a BSS MSC
Trace reference
either from the BSS to the handover. The message is
MSC or from the MSC to the Transaction Id
sent via the BSSAP SCCP OMC Id
BSS. It indicates to the connection associated with
receiving entity that the the dedicated resource.
transmitting entity has
RESET suffered a failure and has lost BSS MSC Cause This message is sent from
memory of the calls in the BSS to the MSC or from
progress, calls set up, and the MSC to the BSS via the
associated references. CLASSMARK relevant SCCP connection Classmark information type 2
BSS MSC
This message is sent as a UPDATE associated with that MS Classmark information type 3
connectionless SCCP transaction. It updates the
message. classmark parameters for the
concerned MS.
This message can be sent
either from the BSS to the This message is sent from
MSC or from the MSC to the the MSC to the BSS via the
BSS. It indicates to the relevant SCCP connection Layer 3 header information
receiving entity that the CIPHER MODE
associated with that MS MSC BSS Encryption information
RESET transmitting entity has COMMAND transaction. It updates the
BSS MSC Cipher response mode
ACKNOWLEDGE cleared all calls and reset all encryption parameters for the
references, and is ready to concerned MS.
resume service. This
message is sent as a This message is sent from
connectionless SCCP the BSS to the MSC via the
message. relevant SCCP connection. It
CIPHER MODE indicates that a successful
Layer 3 message contents
BSS MSC
This message is sent from COMPLETE cipher synchronisation has Chosen encryption algorithm
the BSS to the MSC in order been achieved across the
to indicate that the BSS has radio interface.
performed an internal
handover. The cell identifier Cause The message is sent from the
HANDOVER and (if required for O and M Cell identifier BSS to the MSC as
BSS MSC
PERFORMED reasons) optionally the new Chosen channel described in section 3.1.16 Cell identifier
channel identity is included. Chosen encryption algorithm COMPLETE LAYER (on receipt of the initial layer
The message is sent via the 3 message on a dedicated
BSS MSC Layer 3 information
3 INFORMATION
BSSAP SCCP connection channel, e.g. PAGING Chosen channel
associated with the dedicated RESPONSE, LOCATION
resource. UPDATING REQUEST, CM

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 REESTABLISHMENT This message is sent from
REQUEST, CM SERVICE the BSS to the MSC to
REQUEST, IMSI DETACH). indicate that a set of
The message is sent via the terrestrial resources (ie some
BSSAP SCCP connection timeslots within a system of Cause
established for the CIRCUIT GROUP 2Mbit PCM multiplex) must
associated dedicated be blocked at the MSC, and
BSS MSC Circuit identity code
BLOCK
resource. cannot therefore used for Circuit identity code list
traffic.
This message is sent from This message is sent as a
the BSS to the MSC in order connectionless SCCP
to indicate a delay in the message.
QUEUEING assignment of the
BSS MSC
INDICATION required TCH. The message This message is sent from
is sent via the BSSAP SCCP the MSC to the BSS to
connection associated with acknowledge the receipt of
the dedicated resource. an earlier CIRCUIT GROUP
BLOCK message, and to
This message is sent from CIRCUIT GROUP indicate that the circuits
the BSS to the MSC in order Circuit identity code
BLOCKING indicated in the status MSC BSS
to indicate that a message subfield of the Circuit Identity Circuit identity code list
with a SAPI value other than
ACKNOWLEDGE
DLCI Code List have been
SAPI "n" REJECT "0" has been rejected. The BSS MSC removed from service. This
message is sent via the Cause
message is sent as a
BSSAP SCCP connection connectionless SCCP
associated with the dedicated message.
resource.
This message is sent from
This message is sent from the BSS to the MSC to
the MSC to the BSS via the indicate that a set of
relevant SCCP connection. It terrestrial resources (ie some
HANDOVER
indicates to the BSS that the MSC BSS Cause timeslots within a system of
REQUIRED REJECT HANDOVER REQUIRED CIRCUIT GROUP Circuit identity code
2Mbit PCM multiplex) may be BSS MSC
message has not resulted in UNBLOCK returned to service at the Circuit identity code list
handover. MSC, and can therefore be
used for traffic. This message
This message is sent either
is sent as a connectionless
from the BSS to the MSC or
SCCP message.
from the MSC to the BSS. It
indicates to the This message is sent from
receiving entity that the state Circuit identity code the MSC to the BSS to
RESET CIRCUIT of the circuit indicated in the
BSS MSC
Cause acknowledge the receipt of
message is unknown, due to an earlier CIRCUIT GROUP
a failure. This message is UNBLOCK message, and to
sent as a SCCP CIRCUIT GROUP
indicate that the circuits Circuit identity code
connectionless message. UNBLOCKING indicated in the status
MSC BSS
Circuit identity code list
ACKNOWLEDGE subfield of the Circuit Identity
This message is sent either
Code List have been returned
from the BSS to the MSC or
to service. This message is
from the MSC to the BSS. It
sent as a connectionless
indicates to the receiving
SCCP message.
entity that the transmitting
RESET CIRCUIT
entity has cleared a possible BSS MSC Circuit identity This message is sent in
ACKNOWLEDGE call using the circuit, and is either direction in response to
ready to resume service. a message which cannot be
This message is sent as a treated correctly for
connectionless SCCP
Cause
CONFUSION some reason, and for which Both Both
message. another failure message Diagnostics
cannot substitute. The use of
This message is sent from this message may be
the BSS to the MSC via the under operator control.
HANDOVER relevant SCCP connection. It
BSS MSC
DETECT indicates that the correct MS
has successfully accessed
the target cell.

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 This message is sent from
the MSC to the BSS via the
relevant SCCP connection
4 Mobile Application Part (MAP)
CLASSMARK associated with that MS
MSC BSS
REQUEST transaction. It requests an 4.1 Mobility services
update of the classmark
parameters for the concerned
MS. 4.1.1 Location management services
This message is sent from
the BSS to the MSC or vice
versa to indicate to the
Message Description Origin Dest. Message Contents
partner entity that it is
utilising one or several circuit This service is used between Location Update Type
identity codes which are MSC and VLR to update location IMSI
UNEQUIPPED Circuit identity code MAP_UPDATE_LOCATION information in the network. It is TMSI
unknown and which therefore BSS MSC
CIRCUIT Circuit identity code list MSC VLR
should be locally blocked _AREA initiated by an MS when Previous location area ID
immediately and taken out of changing the location area or at CKSN
service. first registration.
This message is sent as a
connectionless SCCP IMSI
message. MSC Address
This service is used by the VLR
This message is sent from MAP_UPDATE_LOCATION to update the location VLR HLR VLR number
the BSS to the MSC via the information stored in the HLR. LMSI
relevant SCCP connection HLR number
CIPHER MODE
associated with that MS BSS MSC Cause
REJECT transaction. It indicates that This service is used between
the BSS is unable to perform HLR and VLR to delete a
the requested ciphering. subscriber record from the VLR.
It may be invoked automatically
The LOAD INDICATION when an MS moves from one
MAP_CANCEL_ IMSI
message is sent from the VLR area to another, to remove HLR VLR
LOCATION the subscriber record from the LMSI
BSS to the MSC and from the
MSC to the BSS. It indicates Time indication old VLR, or by the HLR operator
to the receiving entity that the Cell identifier to enforce a location updating
LOAD INDICATION transmitting BSS has BSS MSC Cell identifier list (target) from the VLR to the HLR, e.g. on
detected a load situation in Resource situation withdrawal of a subscription.
the concerned cell. This Cause
message is sent as a The
connectionless SCCP MAP_SEND_IDENTIFICATION
message. service is used between a VLR
MAP_SEND_
and a previous VLR to retrieve VLR VLR TMSI
IDENTIFICATION IMSI and authentication sets for
a subscriber registering afresh in
that VLR.

The MAP_DETACH_IMSI
service is used by the MSC to
indicate to the VLR that an MS is
no longer reachable. The IMSI
MAP_DETACH_IMSI network needs this information
MSC VLR
TMSI
e.g. to reject an incoming call
without initiating paging on the
radio path.
This service is used between the
VLR and the HLR to cause the
HLR to mark its data for an MS
so that any request for routing
information for a mobile
terminated call or a mobile IMSI
MAP_PURGE_MS terminated short message
VLR HLR
VLR number
be treated as if the MS is not
reachable. It is invoked when the
subscriber record for the MS is
to deleted in the VLR, either by
MMI interaction or automatically,

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 e.g. because the MS has been This service is used between
inactive several days. MSC-B and MSC-A (E-interface)
indicating that the radio path has
been established by MSC-B to
the MS. MSC-A retains then the
main control of the call until it
clears. The response is used by
MAP_SEND_END_SIGNAL MSC-A to inform MSC-B that all MSC-B MSC-A BSS-APDU
resources for the call can be
released in MSCB,
4.1.2 Paging and search either because the call has been
released in MSC-A or because
the call has been successfully
handed over from MSC-B to
Message Description Origin Dest. Message Contents another MSC.
This service is used
between VLR and This service is used between
MSC to initiate paging MSC-B and MSC-A (E-interface)
MAP_PROCESS_ACCESS_
of an MS for mobile IMSI to pass information received on MSC-B MSC-A BSS-APDU
SIGNALLING the A-interface in MSC-B to
MAP_PAGE terminated call set-up, VLR MSC Stored location area Id
mobile terminated TMSI MSC-A.
short message or
unstructured SS
notification. This service is used between
MSC-A and MSC-B (E-interface)
This service is used MAP_FORWARD_ACCESS_
to pass information to be MSC-A MSC-B BSS-APDU
between VLR and SIGNALLING forwarded to the
MSC to initiate paging A-interface of MSC-B.
of an MS in all location
MAP_SEARCH_FOR_MS areas of that VLR. It is VLR MSC IMSI
used if the VLR does This service is used between
not hold location area MSC-B and MSC-A (E-interface)
Target Cell Id
information confirmed MAP_PREPARE_SUBSEQUE to inform MSC-A that it has been
MSC-B MSC-A Target MSC Number
by radio contact. NT_HANDOVER decided that a handover to
either MSC-A or a third MSC BSS-APDU
(MSC-B') is required.

4.1.3 Access management services

MAP_ALLOCATE_HANDOVE This service is used between
MSC and VLR (B-interface) to MSC VLR
R_NUMBER request a handover number.
Message Description Origin Dest. Message Contents
This service is used This service is used between
between MSC and
MAP_SEND_HANDOVER_RE VLR and MSC-B (B-interface) to
VLR to initiate CM service type transfer the handover number to VLR MSC-B Handover Number
PORT be forwarded to and used by
processing of an MS Access connection status
MAP_PROCESS_ACCESS access to the Current Location Area Id MSC-A.
_REQUEST network, e.g. in MSC VLR TMSI
case of mobile Cksn
originated call set- IMSI
up or after being IMEI 4.1.5 Authentication management services
paged by the
network.
Message Description Origin Dest. Message Contents
4.1.4 Handover services This service is used between
the VLR and the MSC when
the VLR receives a MAP
Message Description Origin Dest. Message Contents service indication from
the MSC concerning a RAND
MAP_AUTHENTICATE location registration, call set-
VLR MSC
This service is used between CKSN
Target Cell Id up, operation on a
MSC-A and MSC-B (E-interface)
MAP_PREPARE_HANDOVER when a call is to be handed over MSC-A MSC-B HO-NumberNotRequired supplementary service or a
from MSC-A to MSC-B. BSS-APDU request from the MSC to
initiate authentication.

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 This service is used between 4.1.8 Subscriber management services
the VLR and the HLR for the
VLR to retrieve authentication
information from Message Description Origin Dest. Message Contents
the HLR. The VLR requests
MAP_SEND_AUTHENTICATION some sets of RAND/SRES/Kc This service is used by an HLR to update a
vectors. If the HLR cannot
VLR HLR IMSI
_INFO VLR with certain subscriber data in the
provide the VLR with triplets, following occasions:
an empty response is - the operator has changed the subscription
returned. The VLR may then of one or more supplementary services, basic
re-use old authentication services or data of a subscriber. Note that in
triplets. case of withdrawal of a Basic or
Supplementary service this primitive shall not
be used;
- the operator has applied, changed or
4.1.6 Security management services MAP-INSERT- removed Operator Determined Barring;
- the subscriber has changed data
SUBSCRIBER-
concerning one or more supplementary HLR VLR
DATA services by using a
Message
Message Description Origin Dest. subscriber procedure;
Contents
- the HLR provides the VLR with subscriber
This service is used between the VLR and parameters at location updating of a
MAP_SET_CIPHERING_ the MSC to set the ciphering mode and to subscriber or at
start ciphering applicable. It is called when restoration. In this case, this service is used
MODE VLR MSC Ciphering mode
another service requires that information is to to indicate explicitly that a supplementary
be sent on the radio path service is not provisioned, if the
encrypted form. supplementary service specification requires
it. The only supplementary services
which have this requirement are the CLIR
4.1.7 International mobile equipment identities management services and COLR services.
This service is used by an HLR to remove
certain subscriber data from a VLR if the
Message Description Origin Dest. Message Contents MAP-DELETE- subscription of one or
This service is used between SUBSCRIBER- more supplementary services or basic
services is withdrawn. Note that this service
HLR VLR IMSI
the VLR and the MSC and DATA
between the MSC and the is not used in case
EIR to request check of erasure or deactivation of supplementary
VLR MSC services.
MAP_CHECK_IMEI of IMEI. If the IMEI is not
MSC EIR
IMEI
available in the MSC, it is
requested from the MS and
transferred to the EIR in
the service request.
This service is used between 4.1.9 Identity management services
the VLR and the MSC to
request the IMEI. If the IMEI
MAP_OBTAIN_IMEI is not available in the
VLR MSC
Message Description Origin Dest. Message Contents
MSC, it is requested from the
MS. This service is used by a VLR in order to get,
MAP-PROVIDE- via the MSC, the IMSI of a subscriber (e.g.
IMSI when a subscriber has identified itself with a MSC VLR
TMSI not allocated to any subscriber in the
VLR).
This service is used by a VLR to allocate, via
MAP-FORWARD- MSC, a new TMSI to a subscriber during an
NEW-TMSI ongoing transaction (e.g. call set-up, location MSC VLR TMSI
updating or supplementary services
operation).

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4.2 Call handling services 4.3 Short message service management services

Message Description Origin Dest. Message Contents Message Description Origin Dest. Message Contents
MSRN This service is used between the gateway MSISDN
Bearer Service MAP-SEND-ROUTING- MSC and the HLR to retrieve the routing SM-RP-PRI
GMSC HLR
Tele Service INFO-FOR-SM information needed for routing the short Service Centre
This service is used between an MSC and Dialled Number message to the servicing MSC. Address
MAP_SEND_INFO_FO VLR. It is invoked by an MSC receiving an
MSC VLR CUG Interlock
R_INCOMING_CALL incoming call (call to MS) to request the VLR SM RP DA
for information to proceed and set up the call. CUG Outgoing This service is used between the gateway
Access SM RP OA
MAP-FORWARD- MSC and the servicing MSC to forward
Number of mobile originated or mobile terminated short
GMSC MSC SM RP UI
SHORT-MESSAGE
Forwarding messages. More Messages To
Send
Called Number
This service is used between an MSC and This service is used between the gateway
Bearer Service
MAP_SEND_INFO_ VLR. The service is invoked by an MSC to MSC and the HLR. The MAP-REPORT-SM- MSISDN
Tele Service DELIVERYSTATUS service is used to set the
FOR_OUTGOING_ retrieve the required information from a VLR MSC VLR MAP-REPORT-SM- Service Centre
to enable an outgoing call set up request (call CUG Index Message Waiting Data into the HLR or to GMSC HLR
CALL DELIVERY-STATUS Address
from an MS) to be actioned. Suppress Pref CUG inform the HLR of successful SM transfer
Suppress CUG OA after polling. This service is invoked by the SM Delivery Outcome
gateway MSC.
MSISDN
This service is used between the Gateway CUG Interlock This service is used between the MSC and
CUG Outgoing VLR and as well between the VLR and the IMSI
MAP_SEND_ROUTING MSC and the HLR. The service is invoked by HLR. The MSC initiates this service if a MSC VLR
the Gateway MSC to perform the MSC HLR Access MAP-READY-FOR-SM TMSI
_INFORMATION interrogation of the HLR in order to route a subscriber indicates memory available VLR HLR
Number of Alert Reason
call towards the called MS. situation. The VLR uses the service to
Forwarding indicate this to the HLR.
Network Signal Info
This service is used between the HLR and
IMSI the interworking MSC. The HLR initiates this
This service is used between the HLR and MSIsdn-Alert
MSC Number MAP-ALERT-SERVICE- service, if the HLR detects that a subscriber,
VLR. The service is invoked by the HLR to HLR MSC Service Centre
MSISDN CENTRE whose MSISDN is in the Message Waiting
MAP_PROVIDE_ request a VLR to send back a roaming Data file, is active or the mobile station has Address
number to enable the HLR to instruct the
HLR VLR LMSI
ROAMING_NUMBER memory available.
GMSC to route an incoming call to the GSM Bearer
called MS. Capability This service is used between the HLR and
Network Signal Info the gateway MSC to inform the Service
Centre which MSISDN number is stored in
MSISDN the Message Waiting Data file. If the stored
IMEI MSISDN number is not the same than the
Category one received from the gateway MSC in the
CUG Index MAP-INFORM- MAP-SEND-ROUTING-INFO-FOR-SM MSIsdn-Alert
HLR GMSC
This service is used between the VLR and GSM Bearer SERVICE-CENTRE service primitive the stored MSISDN number MWD Status
MSC. The service is invoked by a VLR to Capability is included in the message. Additionally the
MAP_COMPLETE_ status of MCEF and MNRF flags and the
request the MSC to set up a call to an MS in VLR MSC Network Signal Info
CALL the case of an incoming call, and from an MS inclusion of the particular Service Centre
No Reply Condition
for an outgoing call. address in the Message Waiting Data list is
Time
informed to the gateway MSC when
SS-Data list appropriate.
CUG Interlock
CUG Outgoing This service is used between the MSC and
Access MAP-SEND-INFO-FOR- the VLR. The service is invoked by the MSC
receiving an mobile terminated short MSC VLR SM RP DA
MSISDN MT-SMS message to request subscriber related
NoReply Condition information from the VLR.
Time This service is used between the MSC and
MAP_PROCESS_CALL This service is used between the VLR and SS-Data List the VLR. The service is invoked by the MSC
MSC. It is invoked by the VLR to request the VLR MSC
_WAITING MSC to invoke the Call Waiting service. CUG Index MAP-SEND-INFO-FOR- which has to handle a mobile originated short Service Centre
MSC VLR
GSM Bearer MO-SMS message request to request the subscriber Address
Capability related information from the
Network Signal Info VLR.

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Sources
Message Index
− GSM 04.08 (ETS 300 557): "Digital cellular telecommunications system
ABORT 13 CONNECT ACK 14
(Phase 2); Mobile radio interface layer 3 specification". CONNECTION FAILURE 21
ADDITIONAL ASSIGNMENT 3
− GSM 08.58 (ETS 300 596): “Digital cellular telecommunications system ALERTING 14 DATA INDICATION 20
(Phase 2); Base Station Controller - Base Transceiver Station (BSC - BTS) ASSIGNMENT 4 DATA REQUEST 20
interface Layer 3 specification” ASSIGNMENT COMPLETE 4 DEACTIVATE SACCH 21
− GSM 08.08 (ETS 300 590): “Digital cellular telecommunications system ASSIGNMENT COMPLETE 25 DELETE INDICATION 23
ASSIGNMENT FAILURE 5 DISCONNECT 16
(Phase 2);Mobile-services Switching Centre - Base Station System (MSC - ASSIGNMENT FAILURE 25 EMERGENCY SETUP 14
BSS) interface Layer 3 specification” ASSIGNMENT REQUEST 25 ENCRYPTION COMMAND 22
− GSM 09.02 (ETS 300 599): "Digital cellular telecommunications system AUTHENTICATION REJECT 11 ERROR INDICATION 20
(Phase 2); Mobile Application Part (MAP) specification". AUTHENTICATION REQUEST 11 ERROR REPORT 24
AUTHENTICATION RESPONSE 12 ESTABLISH CONFIRM 20
BCCH INFORMATION 23 ESTABLISH INDICATION 20
BLOCK 25 ESTABLISH REQUEST 20
BLOCKING ACK 25 FACILITY 17
BS POWER CONTROL 22 FOR_OUTGOING_ 38
BSS INVOKE TRACE 29 FREQUENCY REDEFINITION 10
CALL 38 HANDOVER ACCESS 5
CALL 38 HANDOVER CANDIDATE ENQUIRE 27
CALL CONFIRMED 14 HANDOVER CANDIDATE RESPONSE 27
CALL PROCEEDING 14 HANDOVER COMMAND 5
CCCH LOAD INDICATION 23 HANDOVER COMMAND 26
CHANNEL ACTIVATION 21 HANDOVER COMPLETE 5
CHANNEL ACTIVATION ACK 21 HANDOVER COMPLETE 27
CHANNEL ACTIVATION NEGATIVE ACK 21 HANDOVER DETECT 30
CHANNEL MODE MODIFY 10 HANDOVER DETECTION 22
CHANNEL MODE MODIFY ACK 10 HANDOVER FAILURE 5
CHANNEL RELEASE 6 HANDOVER FAILURE 27
CHANNEL REQUEST 10 HANDOVER PERFORMED 28
CHANNEL REQUIRED 23 HANDOVER REQUEST 26
CIPHER MODE COMMAND 29 HANDOVER REQUEST ACK 26
CIPHER MODE COMPLETE 29 HANDOVER REQUIRED 26
CIPHER MODE REJECT 32 HANDOVER REQUIRED REJECT 30
CIPHERING MODE COMMAND 4 HOLD 17
CIPHERING MODE COMPLETE 4 HOLD ACK 17
CIRCUIT GROUP BLOCK 31 HOLD REJECT 17
CIRCUIT GROUP BLOCKING ACK 31 IDENTIFICATION 33
CIRCUIT GROUP UNBLOCK 31 IDENTITY REQUEST 12
CIRCUIT GROUP UNBLOCKING ACK 31 IDENTITY RESPONSE 12
CLASSMARK CHANGE 10 IMMEDIATE ASSIGN COMMAND 23
CLASSMARK ENQUIRY 10 IMMEDIATE ASSIGNMENT 3
CLASSMARK REQUEST 32 IMMEDIATE ASSIGNMENT EXTENDED 3
CLASSMARK UPDATE 29 IMMEDIATE ASSIGNMENT REJECT 3
CLEAR COMMAND 28 IMSI DETACH INDICATION 11
CLEAR COMPLETE 28 LOAD INDICATION 32
CLEAR REQUEST 28 LOCATION 33
CM RE-ESTABLISHMENT REQUEST 13 LOCATION UPDATING ACCEPT 11
CM SERVICE ABORT 13 LOCATION UPDATING REJECT 11
CM SERVICE ACCEPT 13 LOCATION UPDATING REQUEST 11
CM SERVICE REJECT 13 MAP_ALLOCATE_HANDOVER_NUMBER 35
CM SERVICE REQUEST 13 MAP_AUTHENTICATE 35
COMMAND 4 MAP_CANCEL_ 33
COMPLETE LAYER 3 INFORMATION 29 MAP_CHECK_IMEI 36
CONFUSION 31 MAP_COMPLETE_ 38
CONGESTION CONTROL 18 MAP_DETACH_IMSI 33
CONNECT 14 MAP_FORWARD_ACCESS_ SIGNALLING 35

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MAP_OBTAIN_IMEI 36 RELEASE COMPLETE 16
MAP_PAGE 34 RELEASE CONFIRM 20
MAP_PREPARE_HANDOVER 35 RELEASE INDICATION 21
MAP_PREPARE_SUBSEQUENT_HANDOVER 35 RELEASE REQUEST 20
MAP_PROCESS_ACCESS_ SIGNALLING 35 RESET 28
MAP_PROCESS_ACCESS_REQUEST 34 RESET ACK 28
MAP_PROCESS_CALL_WAITING 38 RESET CIRCUIT 30
MAP_PROVIDE_IMSI 38 RESET CIRCUIT ACK 30
MAP_PURGE_MS 33 RESOURCE INDICATION 27
MAP_SEARCH_FOR_MS 34 RESOURCE REQUEST 27
MAP_SEND_ 33 RETRIEVE 17
MAP_SEND_AUTHENTICATION_INFO 36 RETRIEVE ACK 17
MAP_SEND_END_SIGNAL 35 RETRIEVE REJECT 17
MAP_SEND_HANDOVER_REPORT 35 RF CHANNEL RELEASE 22
MAP_SEND_INFO_ 38 RF CHANNEL RELEASE ACK 22
MAP_SEND_INFO_FOR_INCOMING_CALL 38 RF RESOURCE INDICATION 24
MAP_SEND_ROUTING_INFORMATION 38 ROAMING_NUMBER 38
MAP_SET_CIPHERING_ 36 RR STATUS 10
MAP_UPDATE_LOCATION 33 SACCH FILLING 24
MAP_UPDATE_LOCATION_AREA 33 SAPI "n" REJECT 30
MAP-ALERT-SERVICE-CENTRE 39 SETUP 15
MAP-DELETE-SUBSCRIBER-DATA 37 SMS BROADCAST COMMAND 23
MAP-FORWARD-NEW-TMSI 37 SMS BROADCAST REQUEST 23
MAP-FORWARD-SHORT-MESSAGE 39 START DTMF 18
MAP-INFORM-SERVICE-CENTRE 39 START DTMF ACK 18
MAP-INSERT-SUBSCRIBER-DATA 37 START DTMF REJECT 18
MAP-PROVIDE-IMSI 37 STATUS 18
MAP-READY-FOR-SM 39 STATUS ENQUIRY 18
MAP-REPORT-SM-DELIVERY-STATUS 39 STOP DTMF 18
MAP-SEND-INFO-FOR-MO-SMS 39 STOP DTMF ACK 18
MAP-SEND-INFO-FOR-MT-SMS 39 SYNCHRONIZATION CHANNEL INFORMA 11
MAP-SEND-ROUTING-INFO-FOR-SM 39 SYSTEM INFORMATION TYPE 1 7
MEASUREMENT REPORT 10 SYSTEM INFORMATION TYPE 2 7
MEASUREMENT RESULT 22 SYSTEM INFORMATION TYPE 2bis 7
MM STATUS 13 SYSTEM INFORMATION TYPE 2ter 8
MODE 36 SYSTEM INFORMATION TYPE 3 8
MODE MODIFY ACK 22 SYSTEM INFORMATION TYPE 4 8
MODE MODIFY NEGATIVE ACK 22 SYSTEM INFORMATION TYPE 5 8
MODE MODIFY REQUEST 22 SYSTEM INFORMATION TYPE 5bis 8
MODIFY 15 SYSTEM INFORMATION TYPE 5ter 9
MODIFY COMPLETE 16 SYSTEM INFORMATION TYPE 6 9
MODIFY REJECT 16 SYSTEM INFORMATION TYPE 7 9
MS POWER CONTROL 22 SYSTEM INFORMATION TYPE 8 9
MSC INVOKE TRACE 29 TMSI REALLOCATION COMMAND 12
NOTIFY 18 TMSI REALLOCATION COMPLETE 12
OVERLOAD 24 UNBLOCK 25
OVERLOAD 29 UNBLOCKING ACK 26
PAGING 27 UNEQUIPPED CIRCUIT 32
PAGING COMMAND 23 UNIT DATA INDICATION 21
PAGING REQUEST TYPE 1 6 UNIT DATA REQUEST 21
PAGING REQUEST TYPE 2 6 USER INFORMATION 16
PAGING REQUEST TYPE 3 7
PAGING RESPONSE 7
PARTIAL RELEASE 6
PARTIAL RELEASE COMPLETE 6
PHYSICAL INFORMATION 6
PROGRESS 14
QUEUEING INDICATION 30
CM RE-ESTABLISHMENT REQUEST 13
RELEASE 16

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