1. RCS VoLTE IOT Event Overview & Results
Giulio Maggiore
E2NA#4
26-30 November Sophia Antipolis

2. Outline
Background & Scope
Event Details
Results Overview
Next Steps

3. Background & Scope

4. IOT Background RCS VoLTE IOT builds on previous IOT Events
MSF LTE/EPC IOT in March 2010 & VoLTE IOT in September 2011
ETSI IMS Plugtests
MSF partnered with ETSI & GSMA to jointly organise this event
Reflects the common focus of all 3 partners in VoLTE & RCS
Endorses a number of GSMA PRDs
Joint Task Force, comprising members from the partner organizations, formed to oversee all aspects of the event
Event web site at:

5. IOT Scope Two main scenarios:
Scenario 1 – RCS VoLTE in Home/Single N/W
GSMA PRDs IR.92, IR.94, IR.90, IR.67 and the RCS Services and Client Specification
Scenario 2 – RCS VoLTE for Roaming & Interconnect
GSMA PRDs IR.65, IR 88, IR.92, IR.94, IR.90, IR,67 and the RCS Services and Client Specification
See Testing Scenarios document at oLTE%20Scenarios% pdf

6. Sub-Scenarios & Test Plans (1/2)
Scenario1 – Home/Single Network
a - Attachment & Registration
b - VoLTE & MMTEL services
c - RCS services
d – Multimedia & MMTEL services TS

7. Sub-Scenarios & Test Plans (2/2)
Scenario 2 - Roaming and Interconnect
Conf I
Roaming I
(Same PLMN)
Conf II
Roaming II
(Diff. PLMN)
Conf III
Interconnect
(Tested w/ Scenario 1)
a - Attachment &
Registration TS
b - VoLTE &
MMTEL Services TS TS
c - RCS Services TS TS TS
d – Multimedia &
MMTEL services

8. Event Details

9. Host Sites
Sponsors

10. Participants & Observers

11. Results Overview

12. Scenario 1 – Home/Single Network

13. Scenario 1 – Highlights (1/2)
Multi-vendor interoperability of UE, eNodeB, EPC, IMS/MMTEL, RCS AS, DRA and PCC technology.
Attachment and registration following ETSI TS
VoLTE calls, based on GSMA IR.92, were demonstrated, including MMTEL services.
Multimedia (voice/video) calls, based on GSMA IR.94, were demonstrated, including MMTEL services.
Ut configuration of MMTEL services was demonstrated.
Dedicated bearers with appropriate QCI were established for both voice & video connections.

14. Scenario 1 – Highlights (2/2)
RCS FT and RCS Chat were demonstrated.
The IMS Soft Clients interworked successfully with 3rd party LTE data dongles for attachment IMS services.
No issues with GTP.
Transcoding, transrating and DTMF collection was demonstrated via an AS and MRF
DRAs greatly simplified Diameter routing and provided interworking between different transport layer protocols and Diameter application implementations.

15. Scenario 1 – Observations (1/3)
PCC Issues
On Rx interfaces, one P-CSCF was not compliant.
Some AVPs were incorrectly present or incorrectly tagged as mandatory. These issues were fixed by the DRA.
IMS Issues
Fragmentation issues were seen when the MTU size exceeded that specified by 3GPP (e.g octets in the transport network).
PCC Issues
DRAs greatly simplified Diameter routing and provided interworking between different transport layer protocols and Diameter application implementations.
IMS Issues
Fragmentation issues were solved by reducing the size of the invite by reducing the number of codex and also using TCP in place of the UDP.

16. Scenario 1 – Observations (2/3)
IMS Issues (continued)
The Sh interface was not supported on all implementations of Application Servers.
The Ut interface was not supported on all MMTel AS's.
RCS Capability Exchange failed due to an IMS core not transiting the SIP OPTIONs message.
Some SIP syntax errors observed – and also a difference in tolerance of such errors between implementations.
This was fixed but not re-tested due to running out of time.

17. Scenario 1 – Observations (3/3)
Transport Issues
SCTP was not supported all DRA clients, TCP was the transport protocol supported by some of them.
ENUM was not used.
Transport Issues
The DRA provided transport layer interworking.

18. Scenario 2 – Roaming (configuration I)

19. Scenario 2 – Roaming (configuration II)

20. Scenario 2 – Roaming Highlights
2 PLMNs connected via an IPX.
DIAMETER message routing via V-PLMN MME and H-PLMN HSS was proven to work via DEA/DRA in each lab and IPX DRA.
HSS
DRA/DEA
IPX DRA
DEA/DRA
MME
H-PLMN
IPX
V-PLMN

21. Scenario 2 – Roaming Observations
SIM Card Issues
Roaming could only be tested one way
Attachment Failure
Despite DIAMETER routing working between the chain of DRAs and MME/HSS, the attachment did fail which then blocked further tests being able to be run...
…however, there was a successful registration using a soft client attached to the IPX.
DRA/DEA Topology Hiding
Topology hiding was also tested.
SIM Card Issues
Roaming was tested one way (Slovenian UE roaming in Beijing) due to there being no Chinese SIMs in the Slovenian lab
Attachment Failure
This was somewhat kludgey but at least did demonstrate that a SIP REGISTER could traverse the IPX and IBCF to get to the H-PLMN Registrar/HSS and indicating that SIP message routing worked.
DRA/DEA Topology Hiding
The Destination-Host of the HSS was not set by the visited network, and Diameter routing was performed on a hop-by-hop basis between DEA’s on the edge of the Visited and Home Networks. If full topology hiding was implemented (Origin-Host masked across the interconnect by the visited DEA), the visited DEA would be required to perform a mapping of the received User-Name to the relevant MME in order to be able to route the incoming Diameter request from the HSS. This mapping is seen as an intensive functionality that is not recommended.

22. Scenario 2 – Interconnect

23. Scenario 2 – Interconnect Highlights
The two host sites were successfully connected via an IPX with SIP/RTP traversing the IBCF/TrGW in each site and the intermediate IPX Gateway.
Multi-vendor interoperability of IBCF/TrGW's and IPX was achieved.
VoLTE calls, based on GSMA IR.92 and IR.65, are a viable solution for providing voice services for LTE access between Mobile Network Operators.

24. Scenario 2 – Interconnect Observations
RCS tests were not run due to there being no RCS client in the Beijing lab.
MMTel services were not tested due to a lack of time.
Multi-media calls were not tested due to a lack of time.
The external ENUM Server was not used by any of the IBCFs nor IPX.

25. Conformance Testing
Additional background activity to perform SIP / DIAMETER conformance criteria checking during IOT tests and validating ETSI Diameter /SIP Conformance Test Suites using ETSI tools to enable automatic conformance checking of Diameter / SIP messages captured during the IOT
The Diameter signalling messages turned out to be syntactically correct.
The SIP conformance criteria checking showed several syntax errors in SIP headers exchanged between different equipment, such as:
missing characters (“<”, “>”, ...) in some headers
unexpected superfluous space characters detected at the end of some SIP messages

26. Operator Workshop “Next Generation Services: RCS, VoLTE & Beyond”
Organized by ETSI and hosted by Iskratel, in parallel with the IOT
Included a visit to the IOT lab and some demos
Workshop details & presentations available at

27. Next Steps

28. White Paper & Liaisons White Paper launch: 14th November
Available at ml
Liaison Statements sent to partner fora
Add white paper web address

29. Potential Future Testing
Tests that were not run this time:
RCS Presence / Cap Ex / In Call Services / Multi-Tasking Services
Non-LTE Access via S4-SGSN
Non-LTE Access via legacy SGSN
2G/3G handover via S4-SGSN
2G/3G handover via legacy SGSN
Priority Call Handover (LTE/IMS <-> Other RAN/CS)
Other testing:
Further RCS testing (ref. GSMA accreditation tests)
Enterprise RCS
LTE-Wi-Fi Interworking
Emergency call
SRVCC

30. Thank you
Questions / Comments

31. Back Up Slides

32. Equipment (Sintesio site)
Sintesio
LTE UE
 3rd party
D2Tech
VoLTE Client
Radisys
RCS Client
eNodeB
Telekom Slovenia
 Telekom Slovenia
EPC (MME+SGW+PGW)
Cisco (Milan)
HSS
Iskratel (Kranj)
PCRF
Tekelec (USA)
P-CSCF/IMS-ALG
Metaswitch
I/S-CSCF
MMTel AS
Genband (Turkey)
Iskratel
MRF
RCS Video Share AS
 Genband (Turkey)
RCS IM/Chat Server
IBCF-TrGW
DRA
Ulticom
 Ulticom
IPX
Aicent (USA)
ENUM
Neustar (USA)
Monitoring Equipment
JDSU
Local
Remote (location)

33. Equipment (Beijing site)
CMCC
LTE UE
WIFI UE
VoLTE Client
RCS Client
eNodeB
EPC (MME+SGW+PGW)
HSS
PCRF
 Tekelec (USA)
P-CSCF/IMS-ALG
Acme Packet
I/S-CSCF
MMTel AS
Genband (Turkey)
MRF
RCS Video Share AS
RCS IM/Chat Server
IBCF-TrGW
DRA
Tekelec (USA)
IPX
Aicent (USA)
ENUM
Neustar (USA)
Monitoring Equipment
JDSU
Local
Remote (location)