Transcript Mobile Communication Congestion Exposure Scenario

Mobile Communication
Congestion Exposure Scenario
http://datatracker.ietf.org/doc/draft-kutscher-conex-mobile/
Dirk Kutscher
Faisal Mir
Rolf Winter
Suresh Krishnan
Ying Zhang
<firstname.lastname>@neclab.eu
<firstname.lastname>@ericsson.com
2011-03-31
IETF-80, Prague
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CONEX & Mobile Communications
• CONEX WG: Congestion exposure in a variety of use cases
• WG to focus on use case where end hosts and network
containing destination host are CONEX-enabled
– Other networks need not be
• Mobile communication networks
– Well-defined roles for hosts, nodes, gateways
– Well-defined network boundaries
– Limited resources (wireless), fine-granular policing and
accounting
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Congestion in Mobile Communications
• Moving from telephony to data networks
– Historically: congestion considered a non-issue
– Strict resource management and adequate
resource provisioning
– Also: best-effort traffic considered expendable
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Congestion in Mobile Communications
• Moving from telephony to data networks
– Historically: congestion considered a non-issue
– Strict resource management and adequate
resource provisioning
– Also: best-effort traffic considered expendable
• Inconvenient news
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Shared Resources in LTE
S6a
HSS
PCRF
MME
S11
S1-MME
eNB
UE
Uu
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Gx
S-GW
S1-U
Rx
P-GW
S5/S8
IETF-80, Prague
SGi
Operator IP
Services (IMS,
PSS, etc)
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Shared Resources in LTE
S6a
HSS
PCRF
MME
S11
S1-MME
eNB
UE
Uu
Gx
S-GW
Rx
Operator IP
Services (IMS,
PSS, etc)
P-GW
S1-U
S5/S8
SGi
App UE
Uplink
IP Flows
EPS Bearers:
QoS approach
for managing them
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HTTP
FTP
P2P
VOIP
TFT
Traffic Filters
SDF
Default NGBR
IETF-80, Prague
Dedicated GBR
Downlink
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More Resource Management
• Selected Traffic Offload
– Mitigate congestion in core network by avoiding
tunneling best-effort traffic to gateways, home
networks etc.
• 3GPP chartered to add DPI to policy
framework
– In fact already deployed in many networks
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Assumptions for Our Work
• It‘s really about capacity sharing
– Static differentiation between „best-effort“ and „important“
traffic not useful for that: the Internet is best-effort
– Need reasonable resource sharing and acceptable performance
for all applications
– Low delay just as important for good user experience
• Mobile communication networks are used just as any other
access network
– Bulk background traffic, interactive applications – all in parallel,
on shared links
– Dynamic incentives to back-off will be useful
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draft-kutscher-conex-mobile-00
• Describing 3GPP‘s EPS
• Analyzing CONEX use cases in mobile communication networks
–
–
–
–
–
Traffic management
Incentivize scavenger transport
Accounting for congestion volume
Differential QoS
Partial vs. Full Deployment
• CONEX in the EPS
– Across operator domains
– Within one operator network
– Implementing CONEX mechanisms and policing functions
• Implications for CONEX
– What we should consider for the mechanism spec
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Implications for CONEX
• Consider dynamic path conditions
– Wireless access, multi-access, mobility
• Requirements for fine-granular resource
control (wireless)
• Tunneling
• Traffic Offload
• Roaming
• IPv4?
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