IP Multimedia SubsystemPart 7

Marek Średniawamareks@tele.pw.edu.pl

Institute of Telecommunications

Project is co-financed by European Union within the European Social FundEIMS -2016

MMTel – Multimedia telephony

ISDN/PSTN Simulation Services

MMTel

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IMS MMTel

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MMTel as an alternative for Skype

• Chat: text message delivery

• Voice and video communications

• File (pictures, video clips, data files etc.) transfer

• Point to point and point to multi-point communications

• Dynamic session add-on and removal

• Presence-enabled address book

• Terminal capability adaptation

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MMTel Services

• Multimedia conversational communications between two or more users

– Real time bidirectional conversational transfer of speech, video or optionally other types of data

– Point to point communications between terminals or a terminal and a network entity

• Symmetrical or asymmetrical communications

– Media components present in each direction may be different, or they may be the same but with different bit rates and Quality of Service

– Can be started with only one type of media and additional types of media may or may not be added by the users as the communication progress.

– Media can be removed on request

– Communication persists as long as there is at least on connected media

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MMTel Services

• Support for supplementary services– The behaviour of these services is almost identical to supplementary

services for CS voice (TS 11) and PSTN/ISDN.

– When a supplementary service is invoked it applies to all media components

– supplementary service can be activated by the user for one or more types of media components.

– If one or more of these media components are present, the supplementary service is invoked.

• Universal availability & accessibility– Users are provided with the services regardless of operator and access

technology.

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Multimedia Telephony Service• Multiple Simultaneous Media Streams

– Voice– Text– Video– File Transfer– Video/Photo/Audio Sharing

• Multimedia analogs of traditional PSTN supplementary services– Originating Identification Presentation (OIP)– Originating Identification Restriction (OIR)– Terminating Identification Presentation (TIP)– Terminating Identification Restriction (TIR)– Malicious Communication IDentification (MCID)– Anonymous Communication Rejection (ACR)– Communication Diversion (CDIV)– Communication Waiting (CW) – Communication Hold (HOLD)– Communication Barring (CB)– Completion of Communications to Busy Subscriber (CCBS)– Message Waiting Indication (MWI)– Conference (CONF)– Advice Of Charge (AOC)– Explicit Communication Transfer (ECT)– Reverse charging – Closed User Group (CUG)– Three-Party (3PTY)

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MMTel

• Full duplex speech

• Real time video (simplex, full duplex), synchronized with speech if present

• Text communication

• File transfer

• Video clip sharing, picture sharing, audio clip sharing– Transferred files may be displayed/ replayed on receiving terminal for

specified file formats.

• PSTN/ISDN like supplementary services

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MMTel: support of SIP signalling

• Usage of additional SIP mechanisms

– IMS Communication Service Identification (ICSI)

– Telephony ApplicationServer (TAS)

• Routing with preference to user’s IMS terminals which support the IMSmultimedia telephony service

• Automatic routing to TAS (Telephony Application Server) of the user’s home network operator

– TAS implements supplementary services

• Specific charging model

• Mapping of additional capabilities of IMS multimedia telephony to the relating CS capabilities

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Selected MMTel supplementary services

• Communication Diversion services (CDIV)

• Message Waiting Indication (MWI)

• Communication Barring (CB)

• Communication Hold (HOLD)

• Explicit Communication Transfer (ECT)

• ….

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Cofiguration of supplementary services

• XCAP application– Aktywacja, deaktywacja, konfiguracja

• Web site

• Number codes, eg.– *67* - call forwarding on busy

• Definition of settings (XML document - simservs)– ETSI TS 183 023 i 3GPP TS 24.623

– AUID (Application Unique ID) - simservs.ngn.etsi.org

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CDIV – Call Diversion

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MWI subscription

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NOTIFY (7)NOTIFY sip:[1080::8:800:200C:417A]:5059;comp=sigcomp SIP/2.0

Via: SIP/2.0/UDP mwi.home1.net;branch=z9hG4bK332b23.1

Max-Forwards: 70

Route: <sip:scscf1.home1.net;lr>, <sip:pcscf1.home1.net;lr>

From: <sip:user1@home1.net>;tag=31415

To: <sip:user1@home1.net>;tag=151170

Call-ID: b89rjhnedlrfjflslj40a222

CSeq: 43 NOTIFY

Subscription-State: active;expires=600000

Event: message-summary

Contact: <sip:mwi.home1.net>

Content-Type: application/simple-message-summary

Content-Length: 816

Messages-Waiting: yes

Message-Account: sip:user1@home1.net

Voice-Message: 4/1 (2/0)

Video-Message: 1/1 (0/0)

Fax-Message: 1/1 (0/1)

To: <user1_public1@home1.net>

From: <user2_public1@home1.net>

Subject: call me back!

Date: 19 Apr 2005 21:45:31 -0700

Priority: urgent

Message-ID: 27775334485@mwi.home1.net

Message-Context: voice-message

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OCB – outgoing call barring

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ICB – incoming call barring

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HOLD (music on hold)

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ECT(blind transfer)

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Beyond IMS …

3GPP: Evolution of UMTS

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Evolution of 3GPP access networkstandards

EDGE EDGE+

W-CDMA HSPA HSPA+

2000

LTE LTE-Advanced

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2010

384Kb/s 1Mb/s

384Kb/s 42Mb/s18Mb/s

100Mb/s 1000Mb/s

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From WCDMA and HSPA to LTE

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WCDMAUMTS

HSDPA HSUPA

HSPA+ LTE

Max. Downlinkspeed

384 kbit/s 14 Mbit/s 28 Mbit/s 100 Mbit/s

Max. Uplink speed 128 kbit/s 5,7 Mbit/s 11 Mbit/s 50 Mbit/s

Latency RTT ~150 ms ~100 ms ~50 ms ~10 ms

Access technology CDMA CDMA CDMA OFDMA / SC-FDMA

UMTS release Rel.99/4 Rel. 5/6 Rel.7 Rel.8

Initial roll out 2003/4 2005/6 HSDPA2007/8 HSUPA

2008/9 2009/10

UMTS Evolution

• Radio Interfaces– Higher Data Throughput– Lower Latency– More Spectrum Flexibility– Improved CAPEX and OPEX

• IP Core Network– Support of non-3GPP Accesses– Packet Only Support– Improved Security– Greater Device Diversity

• Service Layer– More IMS Applications (MBMS, PSS, mobile TV now IMS enabled)– Greater session continuity

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3GPP UMTS R8 delivers

• Significantly increased data throughput– Downlink target 3-4 times greater than HSDPA Release 6– Uplink target 2-3 times greater than HSUPA Release 6

• Increased cell edge bit rates– Downlink: 70% of the values at 5% of the Cumulative Distribution Function (CDF)– Uplink: same values at 5% of the Cumulative Distribution Function (CDF)

• Significantly reduced latency• High mobility

– Cell ranges up to 5 km; with best throughput, spectrum efficiency and mobility. – Cell ranges up to 30 km; Mobility with some degradation in throughput and

spectrum efficiency permitted. – Cell ranges up to 100 km; Supported; degradations accepted

• Reduced CAPEX and OPEX

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What does Release 9 add to LTE?

• Continuing femtocell integration

• Added functionality, broadens LTE deployment scenarios

• Feeding back results from first LTE deployments

• Also, advancing non-LTE technologies

2626

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LTE-Advanced (R10)

• Smooth transition from 3G to 4G

• LTE-Advanced to be the main feature of 3GPP UMTS Release 10

LTE LTE-Advanced

3G 4G

You are here

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What will LTE-Advanced deliver?

• Support for wider Bandwidth (Up to 100MHz)

• Downlink transmission scheme– Improvements to LTE by using 8x8

MIMO

– Data rates of 100Mb/s with high mobility and 1Gb/s with low mobility

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Up link transmission scheme

• Improvements to LTE

• Data rates up to 500Mb/s

Relay functionality

• Improving cell edge coverage

• More efficient coverage in rural

areas

CoMP (coordinated multiple point

transmission and reception)• Downlink coordinated multi-point

transmission

• Uplink coordinated multi-point reception

Local IP Access (LIPA) & Enhanced

HNB to allow traffic off-load

LTE LTE-Advanced

3G 4G

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Evolution to a flat LTE network

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EPC (Evolved Packet Core)new core network for LTE

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Source: Alcatel-Lucent

All IP network for LTE

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Source: Alcatel-Lucent

EPC architecture – 3GPP Release 8

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SGi

PCRF

Gx

HSS

S2b

SWn

Ope rator's IP Services

(e.g. IMS, PSS etc.)

SWm

SWx

Untrusted Non - 3GPP IP

Access SWa

HPLMN

Non - 3GPP Networks

S6b

Rx

PDN Gateway

ePDG 3GPP AAA Server

Gxb

S2a

Gxa

Trusted Non - 3GPP IP

Access STa

Gxc

S5

S6a

3GPP Access

Serving Gateway

UE

SWu

EPC architecture

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Evolved Packet Core (EPC)

• Multi-access core network based on theInternet Protocol (IP) as one commonpacket core network for both

– Trusted networks including• 3GPP Access (LTE-E-UTRAN, UMTS-UTRAN, GPRS-

GERAN)• Non 3GPP Access (WIMAX, CDMA2000/HRPD)

– Untrusted networks including• Non-3GPP Access (WLAN)

• EPC provides connection to IP service domains

– IMS– Internet (or others, e.g. P2P etc.)

• Important EPC functions include:– NAS and security (AAA)– mobility and connectivity management– policy QoS control and charging (PCC)

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IMS Internet

3GPPaccess

non-3GPP access

EPC

Trusted Trusted/ untrusted

Decreasing area of operator’s controlAPIs for IMS and EPC

• All IP networks as a path for OTT (Over the Top) applications

• Service gateway – open APIs: RCS , IMS, EPC

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IMS – Appendix

VCC – Voice Call Continuity

VCC concept

• Maintaining voice calls continuity during transition betweenPS and CS modes

• Autonomous and seamless transition of each terminal

• VCC always implemented in the home network of the served user

• „Anchoring”:– splitting the call into two call legs, and introducing a fixed point in the

network where the two legs are anchored. This allows to hand one leg from one domain to the other without creating interferences with the remaining leg

• 3GPP TS 23.206 and 24.206

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Idea of VCC

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Example of signaling and media path with VCC-enabled terminals

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Architecture of VCC

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Architecture of VCC

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EIMS

Project is co-financed by European Union within European Social FundEIMS -2016