Transcript presentation

An Open Service Architecture with
Location Aware Calls and Services
Lill Kristiansen, Prof. Dr. Scient
Dept. of Telematics, NTNU, Norway
www.item.ntnu.no/~lillk
www.pats.no (lab-information)
[email protected]
1
Outline of the talk
 Trends in evolution
 Layering, separation and towards ’all-IP’
 Some mobility definitions
 User mobility, service mobility, terminal mobility,…
 Virtual home environment
 Brief overview of UMTS IMS system (release 5,..)
 Brief overview of Parlay / UMTS OSA
 API for ’value added services’
 A framework to discuss technical solutions to mobility
 Illustrations of GSM/Camel and IMS/OSA in this
framework
 Illustrations of possible ’middleman’ arrangements using
OSA, to decrease the ’operator centric view’
2
The scope of this talk:
 We are mostly based on the current and upcoming
ETSI/3GPP definitions (GSM, IMS and OSA)
 We look into combinations of ’telephony’ and location
based services
 We consider that each operator:
 Has some hardware and software controlled by himself
Hence has control over the non-functional requirements in
this way
 We do not consider ’mobile code’ in general
 But we may foresee upgrades of software from vendor to
operator, or from operator’s management system to
operator’s switches (call servers and service nodes
3
Evolution:
 Several activities going on
 From CS (Circuit switched)
to PS (Packet switched)
 From monolitic systems (GSM and PSTN)
to layered systems with one common core system
with several access technologies
 QoS and realtime aspects
 GSM (2G CS):
supports ’voice ’interactive conversation with 1 medium)
 UMTS (3G first releases):
 CS multimedia (H.324M) supports multimedia telephony
4
System topology
Today
• Separate Networks
• Separate Users
• Separate Services
5
Separate users
CATV
Data/IP Networks
PSTN/ISDN
• Separate Accesses
• Same Core network
• Same User on different
accesses
• Same Services
PLMN
Tomorrow
Separate Services
UMTS from release 5 on:
IMS: IP Multimedia Subsystem
 Same Core network
 Same User on different
accesses
Content
Servers
Communication
Content
Control
 Same Services
 I can use WLAN, ADSL, LAN,
UTRAN (GPRS) etc. as
accesses in ONE system
 I can have several devices and
move between them
Backbone
Network
Access
Access
Access
Users
6
General types of mobility
 Mobility between several technologies (e.g. with the
same handheld device having several (radio) access
modes).
 User mobility across different devices.
 Mobility in a network (i.e. inside one technology).
 Terminal mobility in GSM network
Either inside one operator domain (/one country)
Or ‘roaming’ (to a foreign contry/operator domain)
7
General mobility definitions
 Personal mobility enables users to use services that are
personalized with their preferences and identity ubiquitously,
independently of both physical location and specific
equipment. … (From TINA-C in the mid-90’ties)
 Service mobility (of a particular service) is defined as the
ability for a user to obtain that particular service
independently of user and terminal mobility. (Ericsson
contribution to ETSI Tiphon 1999)
 Virtual Home Environment (VHE) is defined as a concept
for Personal Service Environment (PSE) portability across
network boundaries and between terminals. The concept of
VHE is such that users are consistently presented with the
same personalized …. (3GPP TS 23.127)
8
Evolution (modified from Kanter)
WAP
e.g. email
MMoIP(1)
e.g. MMS
2,5G ERAN
MMoIP(2)
3G first releases
e.g. steaming
UTRAN
(and H.324M)
MMoIP(3)
IMS/
’telephony’
9
MMoIP(4)
e.g. P2T
3+G from rel.5
UTRAN
Mobile
Internet
QoS and realtime aspects
 The CS part:
 GSM (2G CS):
supports ’voice telephony’
i.e.: ’interactive conversation with one medium’
 UMTS (3G first releases CS):
(H.324M) supports ’multimedia telephony
i.e. ’ ’interactive conversation with multi media’
 The ’data’ part:
 GSM supports CS-data:
not used for ’conversation’ (too much delay)
 GSM/GPRS (2G, 2,5G) supports SMS, and MMS:
MMoIP(1): QoS BE: Best Effort (not requiring real time support)
 GPRS with streaming MMoIP(2)
 From realease 5: All-IP common voice/data
 Full QoS enabling MMoIP(3) (VoIP and MMoIP in)
IMS: Interactive Conversational Services over IP, using SIP
10
 Via WLAN: P2T/PoC (Push to Talk /over Cellular) varying QoS
(delays and walkie-talkie-like)
UMTS IMS architecture
HSS:
CSCF:
Home
Subscriber
Services
HLR-like
’Call Server’
Call/Session
Control
Function
Home B
Home A
HSS
S-CSCF
I-CSCF
HSS
S-CSCF
I-CSCF
P-CSCF Proxy-
I-CSCF Interrogating-
Visited
B
P-CSCF
Visited
A
P-CSCF
S-CSCF ServingxGSN
GPRS-noder
GGSN
GGSN
SGSN
Radio Access Network
SGSN
Radio Access Network
B
A
11
UMTS IMS: basic call flow
Home B
Home A
HSS
S-CSCF
Non-GPRS
access
Networks
(e.g. WLAN)
comes in release 6
I-CSCF
Visited B
S-CSCF
I-CSCF
Visited A
P-SCSF
P-CSCF
GGSN
SGSN
WLAN
B
12
HSS
Radio Access Network
A
Virtual Home Environment (3GPP):
 VHE enables end users to bring with them their
personal service environment whilst roaming between
networks, and also being independent of terminal used
 PSE Personal Service Environment:
 describes how the user wishes to manage and interact
with her communication services. It is a combination of a
list of subscribed to services, service preferences and
terminal interface preferences. PSE also encompasses the
user management of multiple subscriptions, e.g. business
and private, multiple terminal types and location
preferences.
 The PSE is defined in terms of one or more User Profiles.
13
3GPP OSA architecture
 Allows application to use underlying network resources
 Allows combinations:
 Location capabilities (from GSM/UMTS and WLAN)
Radionor Cordis Radioeye allows detailed location in WLAN
 SMS/MMS capabilities
 Call Control capabilities
14
Parlay and UMTS Open Service Access;
Migration and Convergence
15
Parlay/OSA for data-services
Today (2000 and
2004) on PC:
type in your location
into web-page
manually
Tomorrow:
fixed LAN,and WLAN
access into same core
system
16
For data services (From Ericsson 2000)
Avoid typing, get location automatic
e.g. into WAP page (or into SMS content)
Bank services
Location services
Leisure
News
Today in Oslo, Norway(2004):
Call taxi, application fetches your location:nearest taxi comes
(combinations: call, location, applic.data!)
Further issues: mobility between operators,
17
countries and companies for this taxi service
A Framework to analyse the relations
between home and visited in 2G and 3G
 This figure assumes no mobile code
 i.e. more specifically:
Each box is: hardware, software run by one operator
 (We may note that mobility in both 2G and planned
versions of 3G all assumes no mobile code.)
S)
C)
Home
V/access Home
EndV/access End-NW
-NW
-NW
point
-NW
point
A Side (originating)
<-- -->
B side (terminating)
18
Framework applied to 2G with OSA
 NOTE: There is a typo in the paper, this is the right
version of Figure 3, showing Camel
S2)
AS2
OSA
WAP
CC
19
WAP
GW
IN/
Camel
MSC
+VLR
HLR
S)
SCS
HLR
MSC
CC
C)
3G IMS system
in this reference model
 This is previous IMS-slide, now slightly re-arranged
AS
AS
Visited B
SCIM
Home B
HSS
P-SC
P-SC
S-CS
WLAN
20
I-CS
AS
Home A
SCIM
HSS
S-CS
Visited A P-CS
I-CS
SGSN GGSN
Radio A NW
OSA revisited:
with several service providers involved
Sub. AS3
AS4
S3)
OSA
This may be the
(national) regulator
AS2
S2)
SCS
Appl. S)
OSA
AS
SCIM
2G or 3G network underneath OSA
21
HLR/
HSS
C)
Advantages with this new solution
 Less ’operator centric’
 Does not require the 3rd party service provider to have a
business relation with the operator
 The regulator acts as ’neutral middleman’:
 assuring equal access for all service providers
Single point of contact for the enduser
Easier for the enduser to enforce a good privacy policy
22
Network centric =/= operator centric
 AS3 is a network based solution, but totally
independent from the network operator domain
 A personal web-page might also act as a network based
solution
 See Jan Egil Kristiansen Our addresses and phones,
http://heima.olivant.fo/~styrheim/kontakt.en.html
The enduser himself controls the user mobility, and (in nonrealtime) informs his contacts about the ’current terminal/SIM
card)
Allows the enduser to buy local GSM-cards, instead of the
often more expence network operator centric solution with
’roaming’ That is often very expensive, and subject to little
competition
23
Summing up the reference figure
 Allows us to discuss different business models
between home and visited networks
 Fits in with 2G & Camel &OSA
Shows some major drawback with Camel
Due to call server (MSC in visited network)
 Also fits in with 3+G (IMS) & OSA
Nice to use when discussing the advantages of having SCSCF in home network vs. (the now gone option of S-SCSF in
visited network)
Useful when discussing the fully mobile case of ’call nearest
taxi’
Fits in also with private initiatives not described in the 3GPP
standards
 Further issues: Mobile code is not covered
24