OWG000016 WCDMA-CS basic conception, principle and basic call flow intro....ppt
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HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
HUAWEI Confidential
Security Level:
OWG000016 WCDMA-CSbasic conception, principle
and basic call flow
introductionISSUE 2.0
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 2
Upon completion this course, you will be able to :
Master the basic conception of signaling and
trunk network
Master the protocol function listed in the slideMaster the conception of mobility
communication
Master the basic call flow
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 3
Chapter 1 basic conception of signaling network
Chapter 2 basic conception of trunk network
Chapter 3 SS7 basic protocol introduction
Chapter 4 mobility communication basic
conception introduction
Chapter 5 basic call flow introduction
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 4
Chapter 1 basic conception of signaling network
1.1 Whats signaling
1.2 signaling network
1.3 basic conception of signaling network
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 5
Whats signaling
Signaling is the control signal transferred betweencommunication devices( include user termination,switch devices, etc).
In the communication network, except the signalused to transfer services information, there isinformation transferred in the network , and suchinformation is not for voice, images or charactersabout services, but the control signal betweencommunication devices, such as occupancy,release, the busy or free state of devices, thecalled number, etc. that all are control signals
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 6
Signaling classification-by signaling transfer mode
CAS (Channel Associated Signaling ):
Channel Associated Signaling is in-band signaling inwhich user call data and signaling are combined.
CCS (Common Channel Signaling ):
Common Channel Signaling is a signalingsystem used in telephone networks thatseparates signaling information from userdata. Usually TS16 (Timeslot 16) on a E1
interface and TS1 (Timeslot 1) on a T1interface, are exclusively designated to carrysignaling relating to other traffic channels.
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 7
Channel Associated Signaling
Switch network Switch network
Signaling device Signaling deviceCommon control Common control
Switch A Switch Btrunk
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 8
Common Channel Signaling
Switch network Switch network
Signaling deviceSignaling device
Common controlCommon control
Switch A Switch Btrunk
Data link
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 9
Chapter 1 basic conception of signaling network
1.1 Whats signaling
1.2 signaling network
1.3 basic conception of signaling network
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 10
Signaling network
No.7 signaling network is a specific network which is used to transfer the No.7signaling
It is composed of SP, STP and signaling link
Signaling network is a independent network form telephone network, in china theNo7 signaling network has 3 layers
HSTP
LSTP
SP
Between two SP (SP or STP) there is a signaling link
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 11
The dual plane structure of signaling network
AHSTP
HSTPHSTP
HSTP
HSTPHSTP
SP
LSTP
LSTP
SP
SP
LSTP
LSTP
LSTP
LSTP
SP
SP
SP
B
A
B D
A
CB
DA
C
D
F
E
C
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 12
Chapter 1 basic conception of signaling network
1.1 Whats signaling
1.2 signaling network
1.3 basic conception of signaling network
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 13
SP and STP
SP: SP is a node of signaling network to send orreceive the signaling message, and is a initiation
or destination of the signaling message
OPC: it is a signaling point to generate the
signaling message
DPC: it is a signaling destination
STP: if some signaling point is neither OPC nor
DPC, its function is only to transfer the signaling
message from one signaling link to another
signaling link, this SP is STP
SP SP
STP
OPC DPC
STP
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 14
Signaling point
24-bit signaling point combination
14-bit signaling point combination
SLSDPC
CIC
8 4
OPC
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 15
Signaling link and signaling link set Signaling link:
signaling link is between 2 signaling points, and there are at most 16
signaling links between 2 signaling points which are connected to
each other directly; If there more than 16 signaling links between 2
directly connected signaling points, the local or the peer end should
add new signaling point
Signaling link set:Signaling link set is a group of signaling links which have same
property, and these signaling links are between 2 adjacent signaling
points
SPa
Link set
Link 0
Link 1 SPbLink n
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 16
(SLC) Signaling link code and link number
SLC is the number of signaling link, SLC is unique between 2
adjacent signaling point, SLC has 4 bits, so SLC is from 0-15
Link number is a number to distinguish the link in local office, it
is unique in local office
SPa
Link set
Link 0
Link 1
SPb
Link n
Link 2
Link 3
Link n
slc0
slc1slc2
SPcLink 2
Link 3
Link n slc0slc1
slc2 Link 0
Link 1Link n
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 17
Direct connection and similar direct connection
Direct connection
Similar direct connection
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 18
SLS and SLSM
SLS: SLS has 4 bits (000F), is used to select signaling link for
No.7
SLS is circularly changed, in order to grantee the symmetrical
burden of each link or link set
SLSM
signaling link (link set) selection mask, it is indicated by a 4 bit
code
backupCIC
SLS
OPC DPC
4 8 4 24 24
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 19
Signaling link (set) selection setting principle
Setting principle , suppose there are 4 link or link set:
SLS 1 1 0 1
SLSM 1 0 1 0
These bits will be ignored
This bit acts as lowest bit
This bit acts as lower bit
1 0
0 0 1 0%4
2
Add 0in the high bits to constitutes the 0010=0x2
The signaling link number which have the same priority
result
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 20
Signaling route
Signaling route is a logical conception which is used to indicate a
path the signaling message go through from OPC to DPC
SPA SPB SPCLink set AB
Link set ABSignaling RT AB
Signaling RTAC1Link set AB
SPBLink set AB
Signaling RT AC2Link set AB
Link set ABSignaling RT A
B
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 21
Questions
What is CAS, CCS, and No.7 is owned to which type ?
What is the difference of signaling link number and SLC, how many
signaling links can be configured between 2 signaling points, why?
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 22
Chapter 1 basic conception of signaling network
Chapter 2 basic conception of trunk network
Chapter 3 SS7 basic protocol introduction
Chapter 4 mobility communication basic
conception introduction
Chapter 5 basic call flow introduction
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 23
Trunk network
A area B areaB area A area
trunk
TMSC1
TMSC2
VMSC VMSC
TMSC2
VMSC VMSC
TMSC1
TMSC2
VMSC VMSC
TMSC2
VMSC VMSC
A province B province
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 24
Relationship between signaling network and trunk network
trunkSignaling link
TMSC1
TMSC2
VMSC
HSTP
LSTP
SP(TM)
HSTP
LSTP
SP(TM)
SP(INTS)
TMSC1
TMSC2
VMSC
A province B province
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 25
Office direction
There is a office direction if there is direct trunk connection between 2 switch
Attention: G9 has office direction to the direct connected office, but just
MSOFTX3000 has office direction, UMG8900 has no office direction
MSC
GMSCSCP
RNC
HLR
SMC
BSC
MSC2
0
23
1
TMSC2-A
TMSC2-B
VMSC-A VMSC-B
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 26
SRT and RT
SRT
If there is a direct voice channel between two offices, it is taken that there
is a sub-route between them
RT
For an office direction, the set of all sub-routes to it is called a route, Oneroute may contain multiple sub-routes, and different routes may contain the
same sub-routes
A B
C
D
SRT 1
SRT 2
SRT 3
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 27
Trunk circuit and trunk group
Trunk circuit:
The trunk circuit is the component constituting a trunk group, and one
trunk circuit corresponds to one timeslot in E1 line
Trunk group
The trunk group is the component building a sub-route, and it is a setof trunk circuits with the same properties. It can be composed of one or
multiple PCM systems.
The trunk circuits to the same office direction are grouped into one trunk
group
The SS7 trunk group is generally bi-directional, and used to carryoutgoing or incoming traffic.
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 28
CIC (Circuit Identification Code)
The CIC is used to identify a circuit between two SPs. CIC fields only existin the TUP and ISUP messages of circuit switched services. Because a CICfield is 12 bits long, there can be 4096 circuits between two SPs inmaximum
CIC E1#1 E1#0 CICTS0 0000000 00000TS1 0000000 00001
TS31 0000000 111110000001 11111 TS31
7 bits 5 bits CIC
PCM system number PCM timeslot number
0000001 00000 TS00000001 00001 TS1
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 29
CIC number principle
......
......
CIC=0,
CIC=1,
CIC=m1
CIC=0,
CIC=1,
CIC=m2
SLC=0,
SLC=1,
SLC=n1
SLC=0,
SLC=1,
SLC=n2
SPoffice direction 1 office direction 2
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 30
Questions
Whats office direction, if MSOFTX3000/UMG8900 has the conception of office direction ?
Whats the difference and relationship between RT and SRT ?
In which range CIC is unique, and how many CIC can be configured between 2 signalingpoints ?
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 31
Chapter 1 basic conception of signaling network
Chapter 2 basic conception of trunk network
Chapter 3 SS7 basic protocol introduction
Chapter 4 mobility communication basic
conception introduction
Chapter 5 basic call flow introduction
Corresponding Relations of SS7 with OSI Seven-layer
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 32
INAP OMAP MAP
TCAP
SCCP
ISUP TUP
MTP(2
)
MTP(1
)
MTP(3
)
MT
P
Message Transfer
Part
OSI 7 layer model
Application Layer
Presentation layer
Session Layer
Transfer Layer
Signaling network layer
(Network layer)
Signaling Link Layer
( Data Link Layer)
Signaling data link layer ( physical Layer)
HLR VLR
Architecture
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 33
MTP123 protocol
MTP3 implement the functions of the network layer of the OSIreference model, and is used to enable management messagetransmission between the signaling points for the purpose ofensuring a reliable transfer of the signaling messages over thesignaling network in case that signaling links and signalingtransfer points fail
It is used to transfer signaling to a data link. The level 2 functions
together with a level 1 signaling data link provide a signaling linkfor reliable signaling transfer between two directly associatedsignaling points; MTP2 can provide signal unit delimitation, signalunit alignment, error detection, error correction, initial alignment,processor outage, level 2 flow control and signaling link errormonitoring
It is equivalent to the physical layer of the OSI reference modeland is used to generate and receive the signals through thephysical channels. It defines the physical, electrical and functionalcharacteristics of a signaling data link and the means to access it.
Signaling data link (MTP-1)
Signaling link functions(MTP-2)
Signaling network functions(MTP-3)
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 34
ISUP and TUP
ISUP (ISDN User Part ):
It defines the signaling messages, functions and procedures
required to control voice and non-voice services (for example,
circuit switched data communication). The ISUP can not only
implement the functions of the Telephone User Part (TUP) and the
Data User Part (DUP), but also achieve the ISDN services on awide basis, thus having a spacious application scope
TUP (Telephone User Part )
The TUP function is similar to ISUP, but can not support data type
applications
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 35
SCCP protocol
SCCP protocol (Signaling Connection Control Part ):SCCP is one of the user parts in the hierarchical architecture of the
Signaling System No. 7, and resident at the functional level 4.
The SCCP provides additional functions to the Message Transfer Part
(MTP) to cater for both connectionless as well as connection-oriented
network services to transfer circuit related and non-circuit related signaling
information and other types of information between exchanges and
specialized centers in telecommunication networks through a SS7 network
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 36
MAP protocol
MAP protocol (Mobile Application Part ):
MAP defines how information is exchanged between mobile
system communication network entities for the purpose of
achieving Mobile Station (MS) roaming function .
MAP can support location update, authentication, encryption,
hand over functions for MS
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 37
CAP protocol
CAP (CAMEL Application Part ):CAP is from INAP, and it is used for the IN services
CAP enables signaling interworking between GSM Service Switching
Function (gsmSSF), GSM Specialized Resource Function (gsmSRF) and
GSM Service Control Function (gsmSCF) of radio IN functional entities, for
the purpose of supporting CAMEL services
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 38
Questions
Whats the function of MTP123 ?
Whats the function of SCCPTUP/ISUPMAPCAP protocol ?
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Thank you!
www.huawei.com