1. Don Troshynski Technical Director dtroshynski@acmepacket.com
Giving voice to 4G
Don Troshynski Technical Director

2. 4G voice—why? New revenue or increased margins
Consumer voice, presence & messaging
Video: telephony & IPTV
Enterprise hosted services
Enterprise SIP trunking
Accelerate ROI from spectrum and equipment expenses
Cost differential is minimal
Greater customer stickiness – multi-play offering
Competition
Voice is table stakes for fixed replacement
Differentiation vs other mobile broadband providers
Over the top ASP threat – Skype, Google, etc.
HD voice
265 operators selling WiMAX or proprietary BB fixed wireless
62.5% offer commercial services, 13% trialing, 10% planning and 11.5% have idle spectrum
93 countries (EU 35%, APAC 25%, MEA 17%, CALA 14%, NA 10%)
2.4M subscribers – Q2 2008
Avg. subscriber base: 15K for WISPs and 7.2K for CLECs
Customer mix: 2/3 residential and 1/3 business
Mostly high-speed Internet and data services today
Voice and video is coming
4GWE Fall 2009

3. 3 ways for voice over 4G Legacy: UMA Hybrid: MSC VoIP SIP/IMS
4G RAN
Legacy: UMA
MSC
Voice & messaging
UNC
UMA clients (R99 features only)
Hybrid: MSC VoIP CS
Voice & messaging
MSC
4G RAN
SIP clients (R99 features only)
SIP/IMS
P-CSCF
IMS
SIP clients (innovative features)
P/S-GW
4G RAN
Services & applications
Aggregation PoP
Access
Circuit-switched fallback: dual radio approach; 3gPP standard but not a way to offer and detracts from the business case of LTE as running siloed access network for voice with expensive $ per bit and spectrum. MNOs want to turn off 2/3G RANs and refarm spectrum to more efficent LTE
4GWE Fall 2009

4. Why SIP for 4G? No TDM option – need alternative mechanism
Common signaling plane for a ubiquitous access network – IP-based
Moving beyond voice – multimedia, video, IM
SIP has proven to be carrier class – for lower cost
Serve, don’t plumb!
4GWE Fall 2009

5. Challenges for 4G voice service delivery
Regulatory compliance
Service element overloads & signaling resource availability
DoS attacks
Services & applications
Billing & planning
Latency sensitive traffic
Backbone
IP address incompatibility
Signaling & transport protocol incompatibilities
4G RAN
4GWE Fall 2009

6. LTE requires an IPv6— how to manage the transition?
LTE requires IPv6 endpoints
Exhaustion of public IPv4 addresses
Limitations of RFC 1918 around 15M subscribers without overlap
EPC defined as IPv6
Enables IPv4 and IPv6 VoIP/IMS endpoints & service elements to interoperate
Any combination—end and core, access & peering
Core normalization
Less disruptive, capex-friendly migration
Greater service reach – access & interconnect
Ease of deployment & troubleshooting
Faster time to market
B2BUA required that can change IP addresses embedded in SIP messages
SIP header – Contact, Via, Route, Record-Route, etc.
SDP – media addresses & ports
SIP – bi-directional application – sessions start from inside & outside
Mediate at edge, eliminating need for:
Dual-stack endpoints
Deployment of new protocols: ANAT, ICE, etc.
Core infrastructure changes
Customer/peer interface changes
Peers
IPv6
IPv4
you need IPv6 after a certain number of non overlapping RFC 1918 addresses
you could certainly solve the problem with OLIP, but without OLIP, you run out of steam ~15M subs
mobile operators are partials towards v6 versus OLIP
IPv6
IPv4
IPv6
IPv6
IPv6
4GWE Fall 2009

7. Distributed P-CSCF solves many 4G voice delivery challenges
Services Edge
Aggregation Edge
Defined security border
Ensures all core resources are safe from DoS and signaling attacks
Reduced architectural complexity
Normalizes all core traffic at border
Enables ideal IPv6/v6 bridge
Increased control and availability
Maximize core resource utilization and increase availability
Enhanced scalability
Increase core performance by offloading resource intensive functions
Improved operational efficiency
Reduces number of core devices
Simplifies trouble shooting
Satisfies multi-national regulatory mandates
P-CSCF
P-CSCF
P-CSCF
4GWE Fall 2009

8. The leader in session border control
for trusted, first class interactive communications