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Internal
OMF001006GSM Signaling System -
BSSAP(BSS)
ISSUE 2.0
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References
31033202-BSS Signaling Analysis
Manual
GSM Specification 0808
GSM Specification 0408
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Upon completion this course, you will be
able to:
Understand the structure of BSSAP
message
Distinguish BSSMAP and DTAP
messages
Know some BSSMAP and DTAPmessage elements
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Chapter 1 BSSAP Functional Structure
Chapter 2 Typical Messages
Chapter 3 BSC Signaling and Interface Tracing
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BSSAP Functional Structure
BSSAPBSS Application PartBSSMAPBSS Management Application Part
DTAPDirect Transfer Part
CM
MM
SCCPSignaling Connection Control Part
MTPMessage Transfer Part
BSSAP
SCCP
MTP-3
MTP-2
MTP-1
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BSSAP Functional Structure
BSS
BSSAP
SCCP
DTAP BSSMAP
Distribution Function
BSSAP
SCCP
DTAP BSSMAP
A-Interface
MSC
MTP MTP
TransmissionEquipments forAir Interface
CorrespondingBSC ProcessingModules
Distribution Function
Corresponding MSCApplication andControl Modules
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Distribution Sub-layer
To discriminate DTAP and BSSMAP messages
To distribute the DTAP messages to radio link L2 access point
To converge the DTAP messages received from radio link L2
to A-interface signaling link
Functions of BSSAP Distribution Sub-layer
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Components of Distribution Sub-layer
Components of Distribution Sub-layer
Octet 1
Octet L
Octet 3
Octet 2
Octet 1
Octet 2
Octet 3
Octet 4
Octet L
DTAP BSSMAPIdentifier Identifier
DLCI
LI LI Length Indicator
L3 L3
MessageMessage
.. L3 Messages
Distribution
Data Unit
..
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DTAP
DTAP takes charge of transferring transparent L3 messages from MSto MSC or from MSC to MS which BSS will not analyze. It is
transferred between BSS and MSC by using SCCP service class 2
(basic connection-oriented class).
III L3 Information
User data
I Distribution Data Unit
II Length Indication
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DTAP Distribution Data Unit
Distribution Data Unit has two parameters:
Discriminator : 00000000
Data Link Connection IdentityDLCI:
To indicate the data link type that should be used on the radiointerface for the messages sent from MSC to BSS
To indicate the data link type on the radio interface that reports
the message which is sent by BSS to MSC.
Discriminator:Bit: 8 7 6 5 4 3 2 1
0 0 0 0 0 0 0 D
D=1 stands for transparent
transmission (DTAP)
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BSSMAP
The transmission of BSSMAP messages upon SCCP is for the
BSSMAP functional entities of both MSC and BSS to exchange
information.
The distribution data unit of BSSMAP messages only has the
discriminator. D should be equal to 0 which stands for non-transparent transmission.
Discriminator:Bit: 8 7 6 5 4 3 2 1
0 0 0 0 0 0 0 D
D=0 stands for non-transparent
transmission (BSSAP)
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Chapter 1 BSSAP Functional Structure
Chapter 2 Typical Messages
Chapter 3 BSC Signaling and Interface Tracing
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Chapter 2 Typical Messages
1.1 BSSMAP Message
1.2 DTAP Message
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Assignment Request
This message is sent from the MSC to the BSS via the relevant SCCPconnection in order to request the BSS to assign radio resource(s), the
attributes of which are defined within the message.
The message may also include the terrestrial circuit to be used.
INFORMATION ELEMENT REFERENCE DIRECTION TYPE LENMessage Type 3.2.2.1 MSC-BSS M 1
Channel Type 3.2.2.11 MSC-BSS M 5-10
Layer 3 Header Information 3.2.2.9 MSC-BSS O (3) 4
Priority 3.2.2.18 MSC-BSS O 3
Circuit Identity Code 3.2.2.2 MSC-BSS O (1) 3
Downlink DTX Flag 3.2.2.26 MSC-BSS O (2) 2Interference Band To Be Used 3.2.2.21 MSC-BSS O 2
Classmark Information 2 3.2.2.19 MSC-BSS O (4) 4-5
Group Call Reference 3.2.2.55 MSC-BSS O (5) 3-8
Talker Flag 3.2.2.54 MSC-BSS O (6) 1
Configuration Evolution Indication 3.2.2.57 MSC-BSS O (7) 2
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Assignment Complete
The ASSIGNMENT COMPLETE message is sent from the BSS to the MSCand indicates that the requested assignment has been completed correctly.
The message is sent via the BSSAP SCCP connection associated with the
dedicated resource(s).
INFORMATION ELEMENT REFERENCE DIRECTION TYPE LEN
Message Type 3.2.2.1 BSS-MSC M 1
RR Cause 3.2.2.22 BSS-MSC O 2
Circuit Identity Code 3.2.2.2 BSS-MSC O (4) 3
Cell Identifier 3.2.2.17 BSS-MSC O (1) 3-10
Chosen Channel 3.2.2.33 BSS-MSC O (3) 2Chosen Encryption Algorithm 3.2.2.44 BSS-MSC O (5) 2
Circuit Pool 3.2.2.45 BSS-MSC O (2) 2
Speech Version (Chosen) 3.2.2.51 BSS-MSC O (6) 2
LSA Identifier 3.2.2.15 BSS-MSC O (7) 4
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Assignment Failure
The ASSIGNMENT FAILURE message is sent from the BSS to
the MSC via the relevant SCCP connection. It indicates that
there has been a failure in the assignment process at the BSS
and that the assignment procedure has been aborted.
INFORMATION ELEMENT REFERENCE DIRECTION TYPE LEN
Message Type 3.2.2.1 BSS-MSC M 1
Cause 3.2.2.5 BSS-MSC M 3-4
RR Cause 3.2.2.22 BSS-MSC O 2
Circuit Pool 3.2.2.45 BSS-MSC O (1) 2
Circuit Pool List 3.2.2.46 BSS-MSC O (2) V
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Handover Required This message is sent from the BSS to the MSC to indicate that for a given
MS which already has dedicated radio resource(s) assigned, a handover is
required for the reason given by the cause element.
The message is sent via the BSSAP SCCP connection associated with the
dedicated resource(s).
INFORMATION ELEMENT REFERENCE DIRECTION TYPE LENMessage Type 3.2.2.1 BSS-MSC M 1
Cause 3.2.2.5 BSS-MSC M 3-4
Response Request 3.2.2.28 BSS-MSC O 1
Cell Identifier List(Preferred)
3.2.2.27 BSS-MSC M 2n+3to
7n+3
Circuit Pool List 3.2.2.46 BSS-MSC O (1) V
Current Channel Type 1 3.2.2.49 BSS-MSC O (2) 2
Speech Version (Used) 3.2.2.51 BSS-MSC O (3) 2
Queueing Indicator 3.2.2.50 BSS-MSC O 2
Old BSS to New BSS Information 3.2.2.59 BSS-MSC O 2-n
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Handover Request
This message is sent from the MSC to the BSS via the relevant SCCPconnection to indicate that the MS is to be handed over to that BSS.
INFORMATION ELEMENT REFERENCE DIRECTION TYPE LEN
Message Type 3.2.2.1 MSC-BSS M 1
Channel Type 3.2.2.11 MSC-BSS M 5-10
Encryption Information 3.2.2.10 MSC-BSS M (1) 3-n
Classmark Information 1 Or 3.2.2.30 MSC-BSS M# 2
Classmark Information 2 3.2.2.19 MSC-BSS M (6) 4-5Cell Identifier (Serving) 3.2.2.17 MSC-BSS M 5-10
Priority 3.2.2.18 MSC-BSS O 3
Circuit Identity Code 3.2.2.2 MSC-BSS O (7) 3
Downlink DTX Flag 3.2.2.26 MSC-BSS O (3) 2
Cell Identifier (Target) 3.2.2.17 MSC-BSS M 3-10
Interference Band To Be Used 3.2.2.21 MSC-BSS O 2
Cause 3.2.2.5 MSC-BSS O (9) 3-4
Classmark Information 3 3.2.2.20 MSC-BSS O (4) 3-14
Current Channel type 1 3.2.2.49 MSC-BSS O (8) 2Speech Version (Used) 3.2.2.51 MSC-BSS O (10) 2
Group Call Reference 3.2.2.55 MSC-BSS O (5) 3-8
Talker Flag 3.2.2.54 MSC-BSS O (11) 1
Configuration Evolution Indication 3.2.2.57 MSC-BSS O (12) 2
Chosen Encryption Algorithm (Serving) 3.2.2.44 MSC-BSS O (2) 2
Old BSS to New BSS Information 3.2.2.59 MSC-BSS O(13) 2-n
LSA Information 3.2.2.23 MSC-BSS O(14) 3+4n
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Handover Request Acknowledge
This message is sent from the BSS to the MSC and indicates that therequest to support a handover at the target BSS can be supported by the
BSS, and also to which radio channel(s) the MS should be directed.
The message is sent via the BSSAP SCCP connection associated with the
dedicated resource.
INFORMATION ELEMENT REFERENCE DIRECTION TYPE LEN
Message Type 3.2.2.1 BSS-MSC M 1
Layer 3 Information 3.2.2.24 BSS-MSC M (1) 11-n
Chosen Channel 3.2.2.33 BSS-MSC O (4) 2
Chosen Encryption Algorithm 3.2.2.44 BSS-MSC O (5) 2Circuit Pool 3.2.2.45 BSS-MSC O (2) 2
Speech Version (Chosen) 3.2.2.51 BSS-MSC O (6) 2
Circuit Identity Code 3.2.2.2 BSS-MSC O (3) 3
LSA Identifier 3.2.2.15 BSS-MSC O (7) 4
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Handover Command
This message is sent from the MSC to the BSS via the relevant
SCCP connection and contains the target channel to which the
MS should retune.
INFORMATION ELEMENT REFERENCE DIRECTION TYPE LEN
Message Type 3.2.2.1 MSC-BSS M 1
Layer 3 Information 3.2.2.24 MSC-BSS M (1) 11-n
Cell Identifier 3.2.2.17 MSC-BSS O 3-10
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Handover Required Reject
This message is sent from the MSC to the BSS via the relevant
SCCP connection. It indicates to the BSS that the HANDOVER
REQUIRED message has not resulted in handover.
INFORMATION ELEMENT REFERENCE DIRECTION TYPE LEN
Message Type 3.2.2.1 MSC-BSS M 1
Cause 3.2.2.5 MSC-BSS M 3-4
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Handover Complete
This message is sent from the BSS to the MSC via the relevant SCCP
connection.
It indicates that the correct MS has successfully accessed the target cell.
INFORMATION ELEMENT REFERENCE DIRECTION TYPE LEN
Message Type 3.2.2.1 BSS-MSC M 1
RR Cause 3.2.2.22 BSS-MSC O 2
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Handover Failure
This message is sent from the BSS to the MSC via the relevant
SCCP connection. It indicates to the MSC that there has been
a failure in the resource allocation process on handover, and
that the handover has been aborted.
INFORMATION ELEMENT REFERENCE DIRECTION TYPE LEN
Message Type 3.2.2.1 BSS-MSC M 1
Cause 3.2.2.5 BSS-MSC M 3-4
RR Cause 3.2.2.22 BSS-MSC O 2
Circuit Pool 3.2.2.45 BSS-MSC O (1) 2
Circuit Pool List 3.2.2.46 BSS-MSC O (2) V
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Handover Performed
This message is sent from the BSS to the MSC in order to indicate that theBSS has performed an internal handover.
The cell identifier and (if required for O and M reasons) optionally the new
channel identity is included.
The message is sent via the BSSAP SCCP connection associated with the
dedicated resource(s).INFORMATION ELEMENT REFERENCE DIRECTION TYPE LEN
Message Type 3.2.2.1 BSS-MSC M 1
Cause 3.2.2.5 BSS-MSC M 3-4
Cell Identifier 3.2.2.17 BSS-MSC M 3-10
Chosen Channel 3.2.2.33 BSS-MSC O (1) 2
Chosen Encryption Algorithm 3.2.2.44 BSS-MSC O (2) 2
Speech Version (Chosen) 3.2.2.51 BSS-MSC O (3) 2
LSA Identifier 3.2.2.15 BSS-MSC O (4) 4
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Paging
This message is sent from the MSC to the BSS and containssufficient information to allow the paging message to be transmitted
by the correct cells at the correct time.
This message is sent as a connectionless SCCP message.
INFORMATION ELEMENT REFERENCE DIRECTION TYPE LEN
Message Type 3.2.2.1 MSC-BSS M 1
IMSI 3.2.2.6 MSC-BSS M 3-10
TMSI 3.2.2.7 MSC-BSS O (1) 6
Cell Identifier List 3.2.2.27 MSC-BSS M 3 to
3+7n
Channel Needed 3.2.2.36 MSC-BSS O (2) 2
eMLPP Priority 3.2.2.56 MSC-BSS O (3) 2
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Clear Request
This message is sent from the BSS to the MSC to indicate to the
MSC that the BSS wishes to release the associated dedicated
resource(s).
The message is sent via the BSSAP SCCP connection associated
with the dedicated resource(s).
INFORMATION ELEMENT REFERENCE DIRECTION TYPE LEN
Message Type 3.2.2.1 BSS-MSC M 1
Cause 3.2.2.5 BSS-MSC M 3-4
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Clear Command
This message is sent from the MSC to the BSS to instruct the
BSS to release the associated dedicated resource(s).
The message is sent via the BSSAP SCCP connection
associated with the dedicated resource(s).
INFORMATION ELEMENT REFERENCE DIRECTION TYPE LEN
Message Type 3.2.2.1 MSC-BSS M 1
Layer 3 Header Information 3.2.2.9 MSC-BSS O (1) 4
Cause 3.2.2.5 MSC-BSS M 3-4
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Complete Layer 3 Information
The message is sent from the BSS to the MSC on receipt of the initial layer3 message on a dedicated channel, e.g. Paging response, Location
Updating Request, CM Reestablishment Request, CM Service Request,
IMSI detach.
The BSS does not analyse the contents of the initial layer 3 message, other
than the Classmark information.
The message is sent via the BSSAP SCCP connection established for the
associated dedicated resource(s).INFORMATION ELEMENT REFERENCE DIRECTION TYPE LEN
Message Type 3.2.2.1 BSS-MSC M 1
Cell Identifier 3.2.2.17 BSS-MSC M 3-10
Layer 3 Information 3.2.2.24 BSS-MSC M 3-n
Chosen Channel 3.2.2.33 BSS-MSC O (1) 2
LSA Identifier List 3.2.2.16 BSS-MSC O (2) 2+3n
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Chapter 2 Typical Messages
1.1 BSSMAP Message
1.2 DTAP Message
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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.
IEI Information element Type / Reference Presence Format Length
Mobility management
protocol discriminator
Protocol discriminator/10.2 M V 1/2
Skip Indicator Skip Indicator/10.3.1 M V 1/2
Location Updating Accept
message typeMessage type/10.4 M V 1
Location area identificationLocation area
identification/10.5.1.3M V 5
17 Mobile identity Mobile identity/10.5.1.4 O TLV 3-10
A1 Follow on proceedFollow on
proceed/10.5.3.7O T 1
A2 CTS permission CTS permission/10.5.3.10 O T 1
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Location Updating Reject
This message is sent by the network to the mobile station to indicate
that updating or IMSI attach has failed.
IEI Information element Type / Reference Presence Format Length
Mobility management
protocol discriminator
Protocol discriminator
10.2
M V 1/2
Skip Indicator Skip Indicator
10.3.1
M V 1/2
Location Updating
Reject message type
Message type
10.4
M V 1
Reject cause Reject cause
10.5.3.6
M V 1
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Disconnect (network to mobile station direction)
This message is sent by the network to indicate that the end-to-endconnection is cleared.
IEI Information element Type / Reference Presence Format Length
Call controlprotocol discriminator
Protocol discriminator10.2
M V 1/2
Transaction identifier Transaction identifier
10.3.2
M V 1/2
Disconnectmessage type
Message type 10.4 M V 1
Cause Cause 10.5.4.11 M LV 3-31
1C Facility Facility 10.5.4.15 O TLV 2-?
1E Progress indicator Progress indicator
10.5.4.21
O TLV 4
7E User-user User-user10.5.4.25
O TLV 3-131
7B Allowed actions $(CCBS)$ Allowed actions10.5.4.26
O TLV 3
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Disconnect (mobile station to networkdirection)
Disconnect
This message is sent by the mobile station torequest the network to clear an end-to-endconnection.
The message contents are similar to those ofDisconnect (network to mobile station direction)
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Setup (mobile originating call establishment)
This message is sent from the mobile station to the network to initiatea mobile originating call establishment.
IEI Information element Type / Reference Presence Format Length
Call controlprotocol discriminator
Protocol discriminator10.2
M V 1/2
Transaction identifier Transaction identifier10.3.2
M V 1/2
Setupmessage type
Message type10.4
M V 1
D- BC repeat indicator Repeat indicator10.5.4.22
C TV 1
04 Bearer capability 1 Bearer capability10.5.4.5
M TLV 3-15
04 Bearer capability 2 Bearer capability10.5.4.5
O TLV 3-15
1C Facility (simple recall alignment) Facility10.5.4.15
O TLV 2-
5D Calling party sub-address
Calling party subaddr.10.5.4.10
O TLV 2-23
5E Called party BCDnumber
Called party BCD num.10.5.4.7
M TLV 3-43
6D Called party sub-address
Called party subaddr.10.5.4.8
O TLV 2-23
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Chapter 1 BSSAP Functional Structure
Chapter 2 Typical Messages
Chapter 3 BSC Signaling and Interface Tracing
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Means of BSC Signaling and InterfaceTracing
Signaling analyzer
MA10
KC1297
BSC Maintenance Console
GSM Interface Tracing
GSM Interface Tracing ReviewNO7 Message Tracing
NO7 Message Tracing Review
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Comparison of different means
Signaling Analyzer
Expensive, additional investment needed.
Can trace all the signaling of A-interface and Abis-interface
from the physical layer.
GSM Interface Trace
No additional equipment and investment needed.
A-interface trace to trace BSSAP and SCCP in BSC.
A-bis interface trace to trace A-bis interface L3 messages.
Um interface trace to trace Um interface L3 messages.
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Relevant GSM Specifications
GM 0808A interface
GM 0858A-bis interface
GM 0408Um interface
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