Determine the required delivery characteristics of a packet stream and how a Traffic Management (TM) module can offload compute-intensive tasks. Hear more about the latest innovations in both DPI & TM solutions.

1. Welcome!
Real Implementation Challenges
of LTE Network Equipment: April 12
Exploring the Trade-offs and Deploying LTE Small Cells: Interference
Solutions Mitigation Solutions
May 17
Building EPC Systems
June 14
The LTE Service Layer
July 12
End-to-End QoS in LTE
To view past webinars:
http://www.radisys.com/recent-webinars/
Radisys Corporation Confidential 1

2. End-to-End QoS in LTE
Delivering the Appropriate Customer Experience
Speakers:
Larry Greenstein – Sr. Product Line Manager
Dikshit Sawhney – Software Architect
James Radley – Sr. Architect
July 12, 2012
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3. Today’s Agenda
 Market Dynamics
 LTE QoS Fundamentals
 LTE QoS Methods and Mechanisms
 Policy Enforcement
 Conclusion
 Q&A / Wrap-up
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4. End-to-End LTE Infrastructure
From Radio Access to Media Processing
Radio Access Network Evolved Packet Core Policy Control IMS
IP
Policy &
User Mobility Multimedia
Equipment Charging
Management Subsystem
Routing
Home eNodeB Entity Function Application Media
Server Resource
Function
User Policy &
Equipment Charging Internet
Enforcement
Function
eNodeB LTE Security Serving Packet
Gateway Gateway Gateway
 Macro  Small Cells  10G  40G ATCA  Dumb  Smart Pipes  Audio  Video Conf
 60+ Customer Wins ~40% ATCA Market Share  Traffic Management  ~65% Market Share
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5. Usage Up, Revenue Down
QoS to the Rescue
Capacity Mind The Gap
Revenue vs. Traffic Growth
Traffic
Revenues &
Traffic Gap
Widening
Voice Era
Revenues
Data Era
 Traffic Doubling every 12 months  Must Increase ARPU
 VideoTextOperators’ Albatross
=  Must Lower Cost per Bit
Source: Cisco VNI Source: Heavy Reading
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6. Today’s Agenda
 Market Dynamics
 LTE QoS Fundamentals
 LTE QoS Methods and Mechanisms
 Policy Enforcement
 Conclusion
 Q&A / Wrap-up
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7. LTE QoS: Fundamental Need
 Why QoS?
• Finite network resources
– Radio spectrum limited
– Backhaul bandwidth limited
– Network congestion has to be managed
• Users (applications) need a variety of services
– Guaranteed bit rate (voice)
– High speed throughput (video)
– Priority service (emergency call)
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8. Policy Control and Charging (PCC)
 Policy Management
• Operator control over network usage
• Control the level of service provided and charge accordingly
– Superior performance for the customers that pay for it
– Enforce limits or restrictions based on customer subscription
– Dynamic service level adjustment enhances QoE
– Offer attractive options to gain market share
– Restrict content based on subscription or local laws
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9. Where QoS Happens in the Network
Home AF IMS
Subscriber Application
Server Function Network
Policy &
Mobility
Charging
Management
Rules
Entity
Function
Internet
eNodeB Serving PDN Policy & Charging
UE
Gateway Gateway Enforcement Function
Web
Radio S1 S5
Email Bearer Bearer Bearer
Service
Data Flows
Voice
Packet
Filters
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10. Poll Question 1
 The top QoS concern of operators and equipment
manufacturers is:
A. Adding value and monetizing it (increase revenue)
B. Efficient use of network resources (reduce cost)
C. Ensuring customer satisfaction
D. Compliance with regulations
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11. Today’s Agenda
 Market Dynamics
 LTE QoS Fundamentals
 LTE QoS Methods and Mechanisms
 Policy Enforcement
 Conclusion
 Q&A / Wrap-up
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12. Agenda – QoS Specifics
 QoS Functions in Control & User Plane
 Policy & Charging Control Architecture
 EPS Bearers and Service Data Flows
 QoS Attributes
 Example PCC Call Flow
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13. QoS Functions
 Control Plane
• Admission control maintains information about all available
resources of a network entity and takes decision to allow a
new session or not based on the current resource usage.
• Subscription Control checks whether or not a user is entitled
to use the requested service with the specified QoS attributes
• Service Management coordinates the functions of the control
plane entities during setup, modification and deletion of the
EPS bearers
• Translation function converts between the EPC QoS
parameters the various protocols for service control of
interfacing external networks e.g., UMTS to IP QoS parameters
mapping
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14. QoS Functions
 User Plane
• Mapping function provides each data unit with the specific
marking required to receive the intended QoS at the transfer
by a bearer service, e.g., DSCP marking at the PDN-GW
• Classification function assigns data units to the established
services of a user according to the related QoS attributes if
the user has multiple bearer services established
• Resource Manager distributes the available resources
between all services sharing the same resource based on the
QoS, e.g., scheduling, bandwidth management, and power
control for the radio bearers
• Traffic Shaping provides conformance between the
negotiated QoS for a service and the arriving data traffic
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15. QoS Functions in different Network
Elements
TE MT RAN CN EDGE Gateway Ext.
Netwk.
Class.
Class. Cond.
Cond. Cond. Mapping Mapping Mapping
Resource Resource Resource Resource Resource
Local BS External BS
Manager Manager Manager Manager Manager
RAN Access Network
RAN phys. BS BB network service
Service
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16. Policy and Charging Control (PCC)
Architecture
Subscription
Profile AF
Repository
(SPR) Online
Sp Rx
Charging
System (OCS)
Policy and Charging Rules
Function (PCRF)
Gxx Gx
BBERF PCEF
Gy
Gz Offline
Charging
System
Gateway (OFCS)
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17. PCC Network Elements
 PCRF (Policy & Charging Rules Function)
• PCRF is the central node in the policy and charging control architecture;
it keeps a DB of PCC rules in SPR and supports flow-based charging and
policy (QoS)
• Interworks with other network elements via the Diameter protocol
 SPR (Subscription Profiles Repository)
• DB of PCC rules; can be co-located with HSS or PCRF
• A PCC rule consists of traffic filters to map Service Data Flows (SDF) to
EPS Bearers, QoS and charging related parameters
 PCEF (Policy & Charging Enforcement Function)
• The enforcement part of the policy architecture
• Main functions include DPI, traffic shaping, etc.
• Typically co-located with a PDN-GW
 BBERF (Bearer Binding and Event Reporting Function)
• Bearer Binding and Event Reporting Function
• Use PCC rules to map SDFs to EPS bearers; logical function of PDN-GW
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18. Relationship between SDF Flows and
EPS Bearers
 QoS is defined on a per EPS Bearer basis
• An EPS bearer is an end-to-end connection between the
service user and PDN-GW. It consists of EPC Bearer, S1
Bearer and Radio Bearer
• Service data flows sharing the same QoS/IP address use the
same EPS bearer. Examples of SDFs include FTP, HTTP,
VoIP IMS traffic etc.
• Traffic filters at UE and PDN-GW determine which traffic flow
gets mapped to which EPS Bearer
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19. EPS Bearers
 GBR vs. Non-GBR Bearers
• GBR require resources to be reserved in every node in the
EPS through which data packet traverses; requires efficient
admission control methods
• Non-GBR specifies best-effort service – useful for
background, interactive traffic classes such as email, web
browsing, file download, etc.
 Dedicated vs. Default Bearers
• Default bearer (one per UE IP) setup on Attach provides
basic connectivity – best effort QoS, non-GBR
• One or more Dedicated bearers setup for specific QoS
requirements – can be GBR or non-GBR
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20. QoS Attributes
 Maximum bit rate (MBR, AMBR)
• Maximum allowable bit rate for a GBR bearer or Aggregate
Maximum bit rate for all non-GBR bearers combined
• AMBR defined on per APN and per subscriber basis
 Guaranteed bit rate (GBR)
• Guaranteed by the network via Admission Control
• Can’t exceed MBR in Release 8
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21. QoS Attributes, continued
 QoS Class Identifier (QCI)
• Defines packet forwarding treatment at each node, e.g.,
queuing thresholds, scheduling weight, admission control
priority, etc.
• Nine standardized QCI values with different characteristics –
GBR/non-GBR, priority, delay sensitivity, and packet error
loss rate e.g., QCI 1 is defined for a GBR bearer for
conversational or voice traffic
 Allocation and Retention Priority (ARP)
• “Allocation” dictates control plane behavior during bearer
setup, modification procedures, etc.
• “Retention” determines relative priority of a bearer over
other bearers in case of congestion
• Fifteen different ARP (priority) levels – 1 being the highest
priority
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22. Call Flow - PCRF Interaction During
Dedicated Bearer Setup
UE eNodeB MME Serving GW PDN GW PCRF
(A) 1. IP-CAN Session Modification
2. Create Bearer Request
3. Create Bearer Request
4. Bearer Setup Request / Session Management Request
5. RRC Connection Reconfiguration
6. RRC Connection Reconfiguration Complete
7. Bearer Setup Response
8. Direct Transfer
9. Session Management Response
10. Create Bearer Response
11. Create Bearer Response
12. IP-CAN Session Modification
(B)
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23. Today’s Agenda
 Market Dynamics
 LTE QoS Fundamentals
 LTE QoS Methods and Mechanisms
 Policy Enforcement
 Conclusion
 Q&A / Wrap-up
Radisys Corporation Confidential 23

24. PCEF and DPI
 The Policy & Charging Enforcement Function (PCEF)
cannot rely on coarse-grained assumptions about flow
types
• Subscriber to be identified and associated policy profile retrieved
• DPI of multiple initial packets in every new stream required to
correctly determine service signature
• Fragmented packets may need to be temporarily reassembled for
analysis before forwarding on in original pieces.
 Policy engines need to be tailored to the unique
requirements for the confluence or regional usage
patterns and characteristics of installed network
• Enforce only those policies which matter and with no more
precision than necessary
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25. User Specified Profiles
 The win-win cost / benefit advantage of user-elected
usage profiles make this a compelling technology
 My ideal profile may not be yours, e.g.:
• On-time delivery of VoIP packets above all else
• Anything over VPN should get preference over everything below
• Favor web browsing traffic
– But no need to hurry advertisements
• Don’t prejudice email traffic unless you must
• Feel free to throttle video (I don’t care) – unless I’m on Wi-Fi
• Please block software updates when I am roaming
– Particularly difficult: how does an operator export preference profiles?
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26. Typical Flow Management Architecture
Stage 1 Stage 2 Stage 3
Flow
De-tunnel Extract flow ID Table Stage 4
Known Flow Apply Rule
Update flow table
Application processing
~ 90% of packets - Load Balance
Stage 5 - Rate shaping
- Monitoring / Analysis
Unknown Classification Engine - Video conversion
- Policy enforcement
Low
level Update flow table
~ 10% of packets
Stage 6
Custom Assign new flow to
appropriate target
appln resource
Stateful, application aware, load balancer is key for traffic steering applications
Radisys Corporation Confidential 26

27. Packet Flow Analysis
New packets arriving enable additional detail to be extracted from flow
…approx 10% packets
HTTP GMAIL Metadata
…Username
…Email title
Server Load
…Content
API State Machine
User Application
Add new entry by default…
Application adds …or wait for application Buffered
table entry & rule API Packets
Apply Rule
e.g. put into correct
priority queue
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28. Possible Mapping of LTE QCI:
Single Subscriber
Priority 1
QC5
Signaling
Commit
WFQ
Flow Shaper Priority 2
CIR
QC1 Commit/Excess/Red
Voice
<Commit
Flow Shaper Green
QC2 Commit/Excess/Red
Video
Strict Priority
Priority Mapper
Class Shaper
Flow Shaper
Excess
QC3
WFQ
Commit/Excess/Red Priority 4
CIR
Video <Excess
Yellow
Flow Shaper
QC4 Commit/Excess/Red
Gaming
>Excess
QC6
Red
Gaming
Non-CIR
QC7 Video Priority 3
WFQ
QC8 TCP
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29. Example: Traffic Management Assist
 NPU mezzanine provides 80Gbps NPU for PP81 to
accelerate blade performance
 Broad potential applications
• Load Balancing
• Ingress Traffic Management
• Egress Traffic Management
• IP Defragmentation
• Packet Normalization
• Statistics Acceleration
 Efficient Software Interface for low overhead on XLP
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30. Traffic Management Connectivity
4 DIMM
PCIe x8
XLP832
RTM
PCIe x8 / ILA
ICI
TM Mezzanine Up to 120Gbps
XLP832 4x10G
120G
PCIe x1
4 DIMM
4x10G
Fabric
Buffer
Memory 200G Fabric
TM Unit Broadcom Up to 5 ports
Stats Trident switch
Memory
8 x10G 5 x 40G
(fabric ch0-4)
 TM connects into main Ethernet switch to allow for flexible packet
routing configurations
 TM managed over PCIe by XLP
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31. Traffic Management Key Features
 Network processors can be used to add a number of
Traffic Management (TM) capabilities to a DPI blade:
• Egress traffic shaping with 256k queues and 5 levels of hierarchy
• Ingress packet filtering and denial-of-service prevention
• Flow-based load balancing across associated processors
• IP Defragmentation and packet reassembly
 An NPU is designed to maintain the huge array of per-
Class of Service (CoS) queue counters and timers
required to provided fine-grained scheduling
• Weighted Round Robin (WRR)
• Deficit [Weighted] Round Robin (DRR / DWRR)
• Weighted Random Early Detection (WRED)
• Committed Information Rate / Committed Burst Size (CIR / CBS)
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32. Poll Question 2
 To adequately classify an LTE GTP-U packet stream
for QoS purposes, what degree of analysis is required?
A. QoS can be defined with a straight mapping based upon
assigned Tunnel Endpoint IDentifer (TEID)
B. Simple mapping from tunneled L3/L4 attributes (L4 port
number, DiffServ, Subscriber’s IP address, etc)
C. Parsing initial packets with a limited set of decision tree rules
to differentiate broad class of service (e-mail, video, http, etc.)
D. Signature analysis on early packets until a precise recognition
is made
E. Ongoing signature analysis in case the nature of the flow
changes
F. Can’t do any useful DPI because packets are encrypted
Radisys Corporation Confidential 32

33. Today’s Agenda
 Market Dynamics
 LTE QoS Fundamentals
 LTE QoS Methods and Mechanisms
 Policy Enforcement
 Conclusion
 Q&A / Wrap-up
Radisys Corporation Confidential 33

34. Conclusions
 LTE QoS Benefits
• User: Assures service delivery meets
expectations
• Operator: Can offer a wide variety of
services and monetize them
Embedded
 LTE QoS Challenges Wireless
• Requires coordination across all Infrastructure
business units to plan and execute Solutions
 LTE QoS Opportunities
• LTE presents a tremendous
Unmatched
opportunity for mobile services to
Products &
grow faster than at any time in the
Expertise
past
Radisys Corporation Confidential 34

35. Today’s Agenda
 Market Dynamics
 LTE QoS Fundamentals
 LTE QoS Methods and Mechanisms
 Policy Enforcement
 Conclusion
 Q&A / Wrap-up
Radisys Corporation Confidential 35

36. Q&A
Contact us!
Larry: larry.greenstein@radisys.com
DS: dikshit.sawhney@radisys.com
James: james.radley@radisys.com
For more information on our products, visit: www.radisys.com
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Radisys Corporation Confidential 36