omf001006 gsm signaling system bssap(bss) training 20060531 a 2.0
Post on 11-Apr-2015
53 Views
Preview:
DESCRIPTION
TRANSCRIPT
HUAWEI TECHNOLOGIES CO., LTD. All rights reserved
www.huawei.com
Internal
OMF001006 GSM Signaling System -
BSSAP(BSS)
ISSUE 2.0
HUAWEI TECHNOLOGIES CO., LTD. Page 2All rights reserved
References
31033202-BSS Signaling Analysis
Manual
GSM Specification 0808
GSM Specification 0408
HUAWEI TECHNOLOGIES CO., LTD. Page 3All rights reserved
Upon completion this course, you will be
able to:
Understand the structure of BSSAP
message
Distinguish BSSMAP and DTAP
messages
Know some BSSMAP and DTAP
message elements
HUAWEI TECHNOLOGIES CO., LTD. Page 4All rights reserved
Chapter 1 Chapter 1 BSSAP Functional StructureBSSAP Functional Structure
Chapter 2 Chapter 2 Typical MessagesTypical Messages
Chapter 3 Chapter 3 BSC Signaling and Interface TracingBSC Signaling and Interface Tracing
HUAWEI TECHNOLOGIES CO., LTD. Page 5All rights reserved
BSSAP Functional Structure BSSAP: BSS Application Part
BSSMAP: BSS Management Application Part
DTAP: Direct Transfer Part
− CM
− MM
SCCP: Signaling Connection Control Part
MTP:Message Transfer Part
BSSAP
SCCP
MTP-3
MTP-2
MTP-1
HUAWEI TECHNOLOGIES CO., LTD. Page 6All rights reserved
BSSAP Functional Structure
BSS
BSSAP
SCCP
DTAP BSSMAP
Distribution Function
BSSAP
SCCP
DTAP BSSMAP
A-Interface
MSC
MTP MTP
Transmission Equipments for Air Interface
Corresponding BSC Processing Modules
Distribution Function
Corresponding MSC Application and Control Modules
HUAWEI TECHNOLOGIES CO., LTD. Page 7All rights reserved
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-layerFunctions of BSSAP Distribution Sub-layerFunctions of BSSAP Distribution Sub-layerFunctions of BSSAP Distribution Sub-layer
HUAWEI TECHNOLOGIES CO., LTD. Page 8All rights reserved
Components of Distribution Sub-layer
Components of Distribution Sub-Components of Distribution Sub-
layerlayer
Components of Distribution Sub-Components of Distribution Sub-
layerlayer
Octet 1
Octet L
Octet 3
Octet 2
Octet 1
Octet 2
Octet 3
Octet 4
Octet L
DTAP BSSMAP
Identifier Identifier
DLCI
LI LI Length Indicator
L3 L3
Message Message
……
..
L3 Messages
Distribution Data Unit
……
..
HUAWEI TECHNOLOGIES CO., LTD. Page 9All rights reserved
DTAP
DTAP takes charge of transferring transparent L3 messages from MS
to 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
HUAWEI TECHNOLOGIES CO., LTD. Page 10All rights reserved
DTAP Distribution Data Unit
Distribution Data Unit has two parameters:
Discriminator : 00000000
Data Link Connection Identity( DLCI) :
− To indicate the data link type that should be used on the radio
interface 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)
HUAWEI TECHNOLOGIES CO., LTD. Page 11All rights reserved
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)
HUAWEI TECHNOLOGIES CO., LTD. Page 12All rights reserved
Chapter 1 Chapter 1 BSSAP Functional StructureBSSAP Functional Structure
Chapter 2 Chapter 2 Typical MessagesTypical Messages
Chapter 3 Chapter 3 BSC Signaling and Interface TracingBSC Signaling and Interface Tracing
HUAWEI TECHNOLOGIES CO., LTD. Page 13All rights reserved
Chapter 2 Typical MessagesChapter 2 Typical Messages
1.1 BSSMAP Message1.1 BSSMAP Message
1.2 1.2 DTAP MessageDTAP Message
HUAWEI TECHNOLOGIES CO., LTD. Page 14All rights reserved
Assignment Request
This message is sent from the MSC to the BSS via the relevant SCCP
connection 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 LEN
Message 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) 2 Interference 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
HUAWEI TECHNOLOGIES CO., LTD. Page 15All rights reserved
Assignment Complete The ASSIGNMENT COMPLETE message is sent from the BSS to the MSC
and 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) 2
Chosen 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
HUAWEI TECHNOLOGIES CO., LTD. Page 16All rights reserved
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
HUAWEI TECHNOLOGIES CO., LTD. Page 17All rights reserved
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 LEN
Message 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+3 to
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
HUAWEI TECHNOLOGIES CO., LTD. Page 18All rights reserved
Handover Request This message is sent from the MSC to the BSS via the relevant SCCP
connection 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) 4-5
Cell 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) 2
Speech 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
HUAWEI TECHNOLOGIES CO., LTD. Page 19All rights reserved
Handover Request Acknowledge This message is sent from the BSS to the MSC and indicates that the
request 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) 2
Circuit 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
HUAWEI TECHNOLOGIES CO., LTD. Page 20All rights reserved
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
HUAWEI TECHNOLOGIES CO., LTD. Page 21All rights reserved
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
HUAWEI TECHNOLOGIES CO., LTD. Page 22All rights reserved
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
HUAWEI TECHNOLOGIES CO., LTD. Page 23All rights reserved
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
HUAWEI TECHNOLOGIES CO., LTD. Page 24All rights reserved
Handover Performed
This message is sent from the BSS to the MSC in order to indicate that the
BSS 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
HUAWEI TECHNOLOGIES CO., LTD. Page 25All rights reserved
Paging
This message is sent from the MSC to the BSS and contains
sufficient 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
HUAWEI TECHNOLOGIES CO., LTD. Page 26All rights reserved
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
HUAWEI TECHNOLOGIES CO., LTD. Page 27All rights reserved
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
HUAWEI TECHNOLOGIES CO., LTD. Page 28All rights reserved
Complete Layer 3 Information
The message is sent from the BSS to the MSC on receipt of the initial layer
3 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
HUAWEI TECHNOLOGIES CO., LTD. Page 29All rights reserved
Chapter 2 Typical MessagesChapter 2 Typical Messages
1.1 BSSMAP Message1.1 BSSMAP Message
1.2 1.2 DTAP MessageDTAP Message
HUAWEI TECHNOLOGIES CO., LTD. Page 30All rights reserved
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 discriminatorProtocol 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
identification
Location 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
HUAWEI TECHNOLOGIES CO., LTD. Page 31All rights reserved
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
HUAWEI TECHNOLOGIES CO., LTD. Page 32All rights reserved
Disconnect (network to mobile station direction)
This message is sent by the network to indicate that the end-to-end
connection is cleared.
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
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 indicator10.5.4.21
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
HUAWEI TECHNOLOGIES CO., LTD. Page 33All rights reserved
Disconnect (mobile station to network direction)
DisconnectDisconnect
This message is sent by the mobile station to request the network to clear an end-to-end connection.
The message contents are similar to those of “Disconnect (network to mobile station direction) “
HUAWEI TECHNOLOGIES CO., LTD. Page 34All rights reserved
Setup (mobile originating call establishment)
This message is sent from the mobile station to the network to initiate
a 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
HUAWEI TECHNOLOGIES CO., LTD. Page 35All rights reserved
Chapter 1 Chapter 1 BSSAP Functional StructureBSSAP Functional Structure
Chapter 2 Chapter 2 Typical MessagesTypical Messages
Chapter 3 Chapter 3 BSC Signaling and Interface TracingBSC Signaling and Interface Tracing
HUAWEI TECHNOLOGIES CO., LTD. Page 36All rights reserved
Means of BSC Signaling and Interface Tracing
Signaling analyzer
MA10
KC1297
BSC Maintenance Console
GSM Interface Tracing
GSM Interface Tracing Review
NO7 Message Tracing
NO7 Message Tracing Review
HUAWEI TECHNOLOGIES CO., LTD. Page 37All rights reserved
Comparison of different means
Signaling Analyzer
Expensive, additional investment needed.
Can trace all the signaling of A-interface and Abis-interface f
rom 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.
HUAWEI TECHNOLOGIES CO., LTD. Page 38All rights reserved
Relevant GSM Specifications
GM 0808: A interface
GM 0858: A-bis interface
GM 0408: Um interface
top related