03 Review CCS7 for 3G.ppt

7/30/2019 03 Review CCS7 for 3G.ppt

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1 NOKIA Review CCS7 for 3G / Kittipong Thamapa

Review CCS7 for 3G Integration


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A Closer look on MTP Signalling Point (SP)

A node in Signalling Network, which can send/receive signalling msg

A Signalling Point can have two roles within one signalling network:

- either it is a Signalling End Point (SEP)

- or it is as Signalling Transfer Point (STP)

Note: STP includes the functionality of SEP

Signalling Point Code (SPC) A unique number in a signalling network used for identification of SP can be OPC and DPC (Origin Point Code & Destination Point Code)

SEP SEPSTP

Signalling message


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STP and SEP in Networks

PSTN

MSC

HLR

MGW

RNC

RNC

SEP

SEP

SEP

STP

STP STP


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Signalling Link Definitions

NCI:;

RNC IPA2800 2006-03-12 20:10:59

ATM BASED SIGNALLING LINKS (Q2210)

EXTERN EXTERN CFNSAL LOG LOG PARAM BIT

LINK LINK SET INTERF VPI-VCI UNIT HPID UNIT TERM SET RATE

---- --------- ------ ------- ------------------ ---------- ----- -----

0 16 MGW1 1 1-35 ICSU-1 2 444FH 0 0 125K

1 17 SGSN1 2 0-45 ICSU-1 1 444FH 1 0 125K

20 19 MGW02 20 1-35 ICSU-0 1 4454H 0 0 125K

COMMAND EXECUTED

LINK Signalling link number

UNIT Computer unit and its number

TERM Signalling terminal

TERM FUNCT Signalling terminal functionLOG UNIT Logical computer address for the unit

LOG TERM Logical signalling terminal function

PARAM SET Parameter set number used by the signalling link

BIT RATE Transmission capacity of signalling link in kbit/s

CFNSAL HPID Index of SSCF-NNI hand pid (ATM links)

ETGR EXCHANGE TERMINAL GROUP


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SLC & SLN

Signalling Link Code (SLC): used to identify a specific signalling link

and must be the same on both sides of the link

Signalling Link Number (SLN): used internally for administrationalpurposed and can be different on both sides of the link

NE1 NE2

SLC = 0SLN=1 SLN=15SLC = 1

SLC = 2

SLC = 3

SLN=2

SLN=3

SLN=4

SLN=16

SLN=17

SLN=18

1-36

1-37

1-35

1-38

1-36

1-37

1-35

1-38

VPI-VCIVPI-VCI


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Signalling Link State

ZNLI;

SIGNALLING LINK STATES

ATM BASED LINKS (Q2210)

=======================

CFNSAL LOG LINK

LINK LINK SET UNIT HPID TERM STATE INFO

---- -------- ---------------------- ----- ----

0 16 MGW1 ICSU-1 2 0 AV-EX

1 17 SGSN1 ICSU-1 1 1 AV-EX

20 19 MGW02 ICSU-0 1 0 UA-INS

COMMAND EXECUTED


7/167 NOKIA Review CCS7 for 3G / Kittipong Thamapa

State of Signalling LinkMain state -substate

1 -substate 2

Name of the state Meaning and the change made

AV-EX available-executing Link is working normally.

UA-AD unavailable-activation denied Operator has taken the link out of use and has denied the activation. See the text.

UA-TST unavailable-testing User has started a data link test and only test traffic can be transferred by the link, while no

signalling traffic is allowed. See the text.

UA-INU unavailable-deactivated by user Operator has taken the link out of use. To activate the link use command NLC.

UA-INS unavailable-deactivated by system System has taken the link out of use. Link has not completed the initial alignment or the

signalling link test procedure successfully. See the text.

UA-BLU unavailable-blocked by user User has blocked the signalling link.

UA-BLR unavailable-blocked by remoteexchange Remote end exchange has blocked the signalling link, or there is a processor outagecondition at the remote end.

UA-BLB unavailable-blocked by user and

remote exchange

The signalling link has been blocked at both ends.

UA-IBL unavailable-inhibited local User has inhibited the link.

UA-IBR unavailable-inhibited remote Remote end has inhibited the link.

UA-IBB unavailable-inhibited local and remote The signalling link is inhibited at both ends.

UA-INU-IBL unavailable-deactivated by user-

inhibited local

User has deactivated and inhibited the signalling link.

UA-INU-IBR unavailable-deactivated by user-

inhibited remote

User has deactivated and the remote end has inhibited the signalling link.

UA-INU-IBB unavailable-deactivated by user-

inhibited local and remote

User has deactivated and inhibited and the remote end has inhibited the signalling link.

UA-INS-IBL unavailable-deactivated by system-

inhibited local

System has deactivated and user has inhibited the signalling link.

UA-INS-IBR unavailable-deactivated by system-

inhibited remote

System has deactivated and remote end has inhibited the signalling link.

UA-INS-IBB unavailable-deactivated by system-

inhibited local and remote

System has deactivated and user has inhibited the signalling link at both ends.



The Signalling Link Set

NE1 NE2

= Signalling Link (TSL dedicated to signalling)

SLS from NE2 to NE1

(defined in NE2)

SLS from NE1 to NE2

(defined in NE1)

Signalling Link is included

in neither SLS it is not

used in the same signalling

network or not at all

Definition: all SLs directly connected 2 signalling points within one signalling network

One signalling point can have many SLS as it has connections to other NEs.

NE3



Signalling Link InterrogationNSI:NA0;

RNC IPA2800 2006-03-12 20:12:57

INTERROGATING SIGNALLING LINK SET DATA

NET SP CODE H/D LINK SET LS STATE LINK SLC

--- ------------------ ---------- -------- --------

NA0 0020/00032 16 MGW1 AV 0 0

NA0 0040/00064 17 SGSN1 AV 1 0

NA0 0050/00080 19 MGW02 UA 20 0



Signalling Route and Route Set

OP

SRS containing all possible

routes (identified by the neighbours)

to reach DP from OP (as defined in OP)

SLS from OP to DP

(as defined in OP)

SLS from OP to STP

(as defined in OP)

DP

STP

Signalling Route (SR): a pre-determined path, consisting of asuccession of signalling points (or signalling transfer points) andinterconnection signalling linksSystem does not store the whole path, but just the neighboring SP

Signalling Route Set (SRS): All possible paths (SR) that can reach DP



Signalling Route Set Definitions

SR can be activated and available when SLS towards SPindicated by that SR is available

To handle redundant route, we can use primary andspare routes orload sharing. But load sharing may causeloops in complex network

Main Signalling Link States: AV (available) & UA(unavailable)



Signalling Route Set

NRI:NA0; //INTERROGATING SIGNALLING POINT DATA

NET SP CODE H/D NAME RS STATE PAR SET

--- ------------------ ----- -------- -------

NA0 0010/00016 MSC01 AV 0

LOAD SHARING BETWEEN SIGNALLING ROUTES DENIED

ROUTES: SP CODE H/D NAME STATE PRIO

------------------ ----- ------ ----

0020/00032 MGW1 AV-EX 7


--- ------------------ ----- -------- -------

NA0 0020/00032 MGW1 AV 0



------------------ ----- ------ ----

0020/00032 MGW1 AV-EX 7



Signalling Route SetSS7 SUBFIELD INFO

NET SP CODE H/D SP NAME SP TYPE STAND COUNT BIT LENGTHS

--- ------------------ ------- ------- ----- ----- -----------

NA0 0030/00048 RNC1 STP ITU-T 1 14 OWN SP


--- ------------------ ----- -------- -------

NA0 0040/00064 SGSN1 AV 0



------------------ ----- ------ ----

0040/00064 SGSN1 AV-EX 7


--- ------------------ ----- -------- -------

NA0 0050/00080 MGW02 UA 0



------------------ ----- ------ ----

0050/00080 MGW02 UA-INS 7



Signalling Network

Can be divided into National & International, i.e. NA0, NA1, IN0, IN1

This structure makes a clear division of responsibility for signallingnetwork management and allows numbering plans of signallingpoints.

NA0:

NA1:

IN0:

IN1:

includes all SPs of all telecommunication networks using C7 in a country

another national signalling network

Bridge network can be used as a world wide network

Another international signalling network, no real application at the moment


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Signalling Network NA0 and NA1

110120

100

300

100

operator A

operator B

operator C

230

210220

200

200

NA0

Country

A300

100

110NA0:200

NA1:120

230

210

200

200

NA1

Country

A

NA1

NA1

NA0

NA0:150

NA1:220

NA0:100

NA1:100


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SCCP and SCCP Sub-Systems< NHI:NA0; //INTERROGATE SUBSYSTEM STATES

NETWORK: NA0 POINT H/D: 0010/00016 SP NAME: MSC01

============ ============================= ==============DESTINATION: ROUTING: SP

NO H/D SS NAME STATE RM NET SP CODE H/D NAME STATE

------ ------- ----- -- --- ------------------ ----- -------

01/001 SCMG AV - NA0 0010/00016 MSC01 AV-EX

8E/142 RANAP AV - NA0 0010/00016 MSC01 AV-EX

NETWORK: NA0 POINT H/D: 0020/00032 SP NAME: MGW1

============ ============================= ==============

DESTINATION: ROUTING: SP


------ ------- ----- -- --- ------------------ ----- -------

01/001 SCMG AV - NA0 0020/00032 MGW1 AV-EX

8E/142 RANAP UA - NA0 0020/00032 MGW1 UA-INU

NETWORK: NA0 POINT H/D: 0030/00048 SP NAME: RNC1

============ ============================= ==============

DESTINATION: ROUTING: SP


------ ------- ----- -- --- ------------------ ----- -------

01/001 SCMG AV - NA0 0030/00048 RNC1 AV-EX

8E/142 RANAP AV - NA0 0030/00048 RNC1 AV-EX

03 Review CCS7 for 3G.ppt

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