3. Future Trends in Signaling

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12 Δεκ 2013 (πριν από 3 χρόνια και 7 μήνες)

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Signaling System 7 Slide
1

Presenter: Bob Wright

Signaling System 7

Signaling System 7

1.
PSTN and TDM


2.
SS7 State of the Technology


3. Future Trends in Signaling
and Networks


Signaling System 7 Slide
2

Presenter: Bob Wright

Objectives


Define the role signaling plays in a
network


Compare the different types of
applications which use SS7


Describe at least one type of call flow
through the network using SS7,
typical of long distance calling


Describe how SS7 enables Local
Number Portability (LNP) and
cellular roaming

Signaling System 7 Slide
3

Presenter: Bob Wright

Signaling System 7

40%


Pre
-
SS7

-
Per
-
trunk signaling (PTS)

-
Tones or multiple frequencies (MF)

-
Trunk provides monitoring and supervision

-
Signaling within the talk path

CO A

Class 5
Office

CO B

Class 4
Office

CO C

Class 4
Office

CO D

Class 5
Office

MF Trunk

#55

MF Trunk

#92

MF Trunk

#1221

973
-
XXX
-
5678

972
-
516
-
1234

Signaling System 7 Slide
4

Presenter: Bob Wright

Signaling System 7 Slide
5

Presenter: Bob Wright

Signaling System 7 Slide
6

Presenter: Bob Wright

Signaling System 7


Making a call over the Public Switched
Telephone Network

-
Off hook

-
Dial some digits

-
Talk to someone anywhere in the world

-
Network figures out where to route the call

Set up call instantly

Tear down the call as quickly

-
Behind the scene is the backbone of signaling systems

-
Subsecond call setup and teardown is the goal


Evolution of signaling systems

-
Legacy systems

-
Common Channel Interoffice Signaling System
Number 7

-
Save time and money on the network

-
Introduce new features and functions in an intelligent
network

Signaling System 7 Slide
7

Presenter: Bob Wright

Signaling System 7: Purposes


Some Purposes of SS7 Network


Look ahead to determine status of called
number, reserving not occupying the talk path


1 second call set up and tear down


Integration of supervision, monitoring, billing
systems


Enable introduction of additional features and
capabilities


Access remote data bases, look up and translate
information from 800 and 900 calls


Marry various stored program
-
controlled
systems in the world



Signaling System 7 Slide
8

Presenter: Bob Wright

Signaling System 7: Why Out
-
of
-
Band?


Advantages over in
-
band signaling


Enables transport of more data at higher
speeds (56 Kbps, faster than MF)


Enables signaling at any time in the entire
duration of the call


Enables signaling to network elements to
which no direct trunk connection is
available (Advanced Intelligent Networks)

Signaling System 7 Slide
9

Presenter: Bob Wright

Signaling System 7: Architecture


Components



Signal Switching Points (SSP) are
telephone switches that generally
originate, terminate, or switch calls,
the node that provides dial tone.




Signal Transfer Points (STP) are the
packet switches of the SS7 network.




Signal Control Points (SCP) are the
databases that provide information
necessary for advanced call
-
processing capabilities.








STP



SSP

SCP

Signaling System 7 Slide
10

Presenter: Bob Wright

Signaling System 7 Basic call setup

Voice Circuit

STP

SS7 LINKS

1a. IAM

1b. IAM

2a. ACM

2b. ACM

3a. ANM

3b. ANM

4a. REL

4b. REL

5a. RLC

5b. RLC

IAM initial address
message

1

3

ANM answer message
(initiate billing)

4

REL release
message, cause

2

ACM address
complete message

5

RLC release complete
message (terminate
billing)

*

CONVERSATION
TAKES PLACE

STP


SSP


SSP

Signaling System 7 Slide
11

Presenter: Bob Wright

Signaling System 7: Architecture


SS7 Architecture
Basic Quad

LINKS

Signaling System 7 Slide
12

Presenter: Bob Wright

Signaling System 7


SS7 Applications


800/888/877/866/900 services


Enhancements in 800/888/877/866 call centers


911 enhancements


Class features


Calling card toll fraud prevention


Credit card approval, authentication


Software/virtual defined private networks


Call tracing


Call blocking



Signaling System 7 Slide
13

Presenter: Bob Wright

Signaling System 7 Slide
14

Presenter: Bob Wright

LNP and Signaling System 7


Three phases of LNP


Service provider portability: change telco,
keep same number


Service portability: want services not
available at local end office, change
switch, keep same telco, keep same
number


Location portability: customer moves far
away from area serviced by telco, the
further the more technical challenge to
LNP, keeping same number

Signaling System 7 Slide
15

Presenter: Bob Wright

LNP and Signaling System 7


Telecommunications Act 1996 goal:


seamless and transparent comunications for the
consumer, with a choice of providers


Major issues


Explain why the FCC is so adamant about using
LNP


explain the need to preserve our telephone
numbering systems


physical interconnection


settlements between carriers for access and co
-
carrier charges

Signaling System 7 Slide
16

Presenter: Bob Wright

Signaling System 7 and Key points of LNP



Demand for LNP and differences between
wireline and wireless carriers for LNP


Wireless churn and fraud


Location NP

-
Database dips (LECs, ILECs, IECs and CLECs)

-
911 issues

-
Billing issues


Describe the new components of LNP
architecture


Signaling System 7 Slide
17

Presenter: Bob Wright

LNP and Signaling System 7


Basic LNP Networks

Signaling System 7 Slide
18

Presenter: Bob Wright

LNP and Signaling System 7


Wireline E
-
911


ANI = automatic number ID

AMA = automatic message accounting

CAMA = Centralized AMA

PSAP = public safety answer point

ALI = automatic location information

Signaling System 7 Slide
19

Presenter: Bob Wright

LNP and Signaling System 7


Wireless E
-
911


PSAP = public safety answer point


GPS to locate caller


ALI = automatic location information,

and x,y coordinates

Signaling System 7 Slide
20

Presenter: Bob Wright

Signaling System 7 Slide
21

Presenter: Bob Wright

SS7 and Roaming Capabilities


Mobile registration


MSC= mobile switching center

VLR = visiting location register

HLR= home location register


Signaling System 7 Slide
22

Presenter: Bob Wright

SS7 and Roaming Capabilities


Incoming call to idle mobile set


Signaling System 7 Slide
23

Presenter: Bob Wright

Signal System 7 Summary


Summary on SS7


Call setup, administration, and tear down
have changed to an out
-
of
-
band separate
signaling system called SS7


The SS7 architecture makes it possible to
reduce costs, implement many new
applications, and integrate wired and
wireless networks


SS7 makes it possible to implement LNP
and roaming, two essential services for
subscribers and businesses

Signaling System 7 Slide
24

Presenter: Bob Wright

Signaling System 7: Change Management and
Leadership Issues


LNP implementation issues


Coordination between telcos

-
Scheduling

-
Installation responsibilities


Customer care end to end


E911 problems, especially wireless


Roaming services


Mode: analog, CDMA, GSM


Applications: voice, data, video


Billing and customer care


Who is in charge?


Telcos large and small


Government


Subscriber

Signaling System 7 Slide
25

Presenter: Bob Wright

Signaling System 7 Slide
26

Presenter: Bob Wright


Future trends in networking and signaling


The Move Towards All IP
Networks


Forecasted explosion in data
traffic


Internet protocol (IP) networks
such as long term evolution (LTE)


Worldwide interoperability for
microwave access (WiMAX).


Signaling System 7 Slide
27

Presenter: Bob Wright


Future trends in networking and signaling


Economic



the need to reduce data
transport costs.


a hedge against becoming a bit pipe


reducing data transport costs, MNOs
could operate a data network
profitably.


IP
-
based protocols also open the door
for MNOs to deploy advanced IP
-
based messaging services


reduce equipment deployment

Signaling System 7 Slide
28

Presenter: Bob Wright


Future trends in networking and signaling


SS7 could help the Internet by
providing:


Improved reliability: extensive continuity
testing, access switch automatically
signals the network to reroute the calls to
another switch without affecting the
service


Better bandwidth utilization: SS7
signaling takes place out
-
of
-
band


Load balancing: more efficient use of ISP
equipment and no busy signal

Signaling System 7 Slide
29

Presenter: Bob Wright

Future trends in networking and signaling


IMS enables wireless convergence (IP
Multimedia Subsystem) based on a 3GPP
variant of SIP


Year 2002 wireless subscribers exceeded
wireline globally


IMS relies on Session Initiation Protocol
(SIP) to establish and maintain call control


SIP is becoming the signaling protocol of
choice for VoIP


SIP brings with it the advantage of presence
to multimedia, concurrent sessions

Signaling System 7 Slide
30

Presenter: Bob Wright

Future trends in networking and signaling


LTE is part of the GSM evolutionary
path beyond 3G technology, following
EDGE
,
UMTS
,
HSPA

(
HSDPA

and
HSUPA

combined) and HSPA
Evolution (
HSPA+
)


LTE overall objective is to provide an
extremely high performance radio
-
access technology that offers full
vehicular speed mobility,


LTE assumes a full Internet Protocol
(IP) network architecture

Signaling System 7 Slide
31

Presenter: Bob Wright

Future trends in networking and signaling


Network Interconnection & Roaming

Signaling System 7 Slide
32

Presenter: Bob Wright


Application data bases and scalability








Provisioning and Database Synch


Future trends in networking and signaling

Signaling System 7 Slide
33

Presenter: Bob Wright



Mobile Tweet Publishing Architecture

Future trends in networking and signaling

Signaling System 7 Slide
34

Presenter: Bob Wright

Future trends in networking and signaling


Efficient SMS
-
Based Tweet Delivery


Using FDA (First Delivery Attempt)

Signaling System 7 Slide
35

Presenter: Bob Wright

CONCLUSIONS


SS7 over IP is the evolution for
signaling


Star shaped network


Clear migration path to IMS


Centralized implementation


Predictable and reliable network
performance


Architecture must be robust, able to
cover hugh network performance
requirements

Signaling System 7 Slide
36

Presenter: Bob Wright

Signaling System 7: Research to Prepare


Thank you very much.


Careers


Software, hardware


Many aspects of network configuration


Revenue generation and protection


Robert B Wright