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Migration to LTE:
Infrastructure Impact
Maria E. Palamara
Director CDMA-LTE Strategy
Alcatel-Lucent
January, 2009
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All Rights Reserved Alcatel-Lucent 20092 Challenges of LTE Migration| January 2009
AT: Access Terminal
eRNC: Enhanced RNC
HA: Home Agent
HRPD: High Rate Packet Data
HSGW: HRPD Serving Gateway
LTE: Long Term Evolution
MME: Mobility Management Entity
PDN GW: Packet Data Network Gateway
PDSN: Packet Data Serving Node
RNC: Radio Network Controller
SGW: Serving Gateway
InternetIntranet
IMS
LTELTE--DODO
ATATLegacyLegacy
DO ATDO AT
LTE/LTE/3GPP3GPP
HRPD/HRPD/3GPP23GPP2
S101S101
S1S1--MMEMME
S1S1--UU
S11S11
S5/S8S5/S8 S2aS2a
A10/A11+A10/A11+ A10/A11A10/A11
BTSBTS
RNCRNC
PDSNPDSN
eBTSeBTS
eRNCeRNC
eNodeBeNodeB
MMEMME
SGWSGW HSGWHSGW
PDN GWPDN GW HAHA
S103S103
eHRPDeHRPD
ATAT
eHRPD
ALU is pioneering cost-effective multimode solutions for HRPD/LTEin standards and network and handset product solutions
LTE to eHRPD/HRPD Interworking
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All Rights Reserved Alcatel-Lucent 20093 Challenges of LTE Migration| January 2009
Key Questions to Consider for LTE enhanced Packet Core Deployments
Network Topology:
What applications will be used with LTE?
High speed data? Video services? Mobile to mobile applications? Voice telephony?Fixed wireless & fixed/mobile convergence?
What are projected traffic models?
Design topology for voice, best-effort data, mobile peer-to-peer applications?
What are geographic redundancy & load sharing plans?
Reuse of Existing Packet Core Equipment vs. New:
Consider how old is existing equipment is it up for the task?
Consider extra traffic demands LTE will put on it
Playing a part in the open application value chain: Importance of DPI & policymanagement
Consider benefits of integration with backhaul concentration routers?
Integrated E2E IP QoS management
Consider the network topology same as before, or more distributed?
Co-location of functions in a single platform?
Application optimization schemes (e.g. leveraging multiple PDN capability)?
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All Rights Reserved Alcatel-Lucent 20094 Challenges of LTE Migration| January 2009
Radical changes or evolution?
Existing paradigm (3G) Howlong? LTE R / E ?
Voice Circuit switched 20 years- no Circuit Switched core
- all voice is VoIP R
Broadband
services
Today: Best effort (WAP, SMS),
Limited expensive broadband
10 yearsReal-time, interactive,
low latency, true broadband QoE
R
Network data
delivery to
terminals
Possible in theory via GPRS;
Mostly blocked by the operatorssince SMS
Possible and probable:
fully managed and charged by PCRF;
network protection by DPI (optional)R
Multisession
data
Wait until you finish with mini-web
browsing or the long conference call, so youcan get your push-emails n/a
All about bearers, sessions, flows:
- user-initiated- network-initiated R
QoS
No e2e QoS only CoS!
In theory: up to 8 CoS
In practice: 2-4
(voice/control, best-effort data)
Since R4
9 QoS, strictly defined parameters, e2e
QCI, SDF, bearers
(3GPP TS 23.207)R
PolicyManagementTheory: PCRF introduced in 3GPP R7
Practice: RADIUS authenticationSince R4 True network-wide policy control and
management (PCRF, PCEF) R
Mobility
Management
Part of RAN;
Mobility hidden
from core network
From
beginning
- no RNCs (radio mgt. by eNB)
- mobility visible and moved to core
(managed from the core network)R-E
4 | Evolved Packet Core | Q1 2009
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All Rights Reserved Alcatel-Lucent 20095 Challenges of LTE Migration| January 2009
Key implications on user plane and control plane
User plane has many common attributeswith fixed broadband
Broadband capacity
QoS for multi-service delivery
Per-user and per-application policies
Highly available network elements
Control plane gets new mobile-specific attributes
Mobility across networks and operators
Distributed mobility management
Massive increase in scalability
Dynamic policy management
WCDMA/HSPAGSM/GPRS/EDGE CDMA/EV-DO
PDSNRNCRNCBSC SGSN/GGSN SGSN/GGSN
eNode B
IP channel
Service DeliveryPlatformsLTE
MME
PCRF
PDN GW
SGW
Evolved Packet Core
5 | SC120 - EPC: The Role of IP in LTE Networks | 2009 Sales Meeting
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6/7All Rights Reserved Alcatel-Lucent 20096 Challenges of LTE Migration| January 2009
Leverage Transport layer Convergence for Seamless Evolution
End-to-End IP nature of LTE facilitates convergence of Mobile-Transport layers tooptimize performance
Seamless convergence of backhaul/backbone networks for 2G/3G/LTE
Deliver sophisticated consistent end-to-end IP QoS across mobile & transport layers
Lower Total Cost of Ownership (TCO) via flexible alignment of mobility (EPC) functionswith transport, backhaul and aggregation
EPC
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