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HUAWEI TECHNOLOGIES CO., LTD.
Evolution of the Mobile Core
Softwarization in 5G MCN
Author/ Email: Artur Hecker/ [email protected]
Version: V1.0(20160110)
HUAWEI TECHNOLOGIES CO., LTD.
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LTE EPC: Limitations wrt 5G expectations Logical Architecture
RAN CORE
MME, SGW
PGW
RU, DU
PGWSGW
MME
eNB
PCRF
HSS
GTP-U
GTP-C
Physical Network
IP backhaul
LTE EPC 5G
Unique, fixed architecture for all needs• The same C-Plane and D-Plane pipelines for all requests
• MME and PGW often overloaded as single anchoring point
• “Always on” principle creates too much network state and signaling
messages
• Carrier grade, secure and reliable elements
New device types• Massive cheap and low power
• Giant critical (V2V, M2M)
Structural dynamics• Multi-tenant
• Small cells, green net
Limited extensibility• Introduction of new elements is difficult
Flexible for unknown• Support of vertical services
Overlay over the transport infrastructure• Non-native usage of the infrastructure, indirect routing
• TCP/IP over GTP over TCP/IP
Smart, low latency• Rapid offloading, breakout
• Augmented data plane
• No-tunneling protocols
Bearer concept• a single pipe or bearer split from the UE to the gateway
MultiRAT Network• Multi-bearer support
• Access agnostic
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Softwarization of Mobile Core Networks
Logical Architecture
RAN CORE
RU
Physical Network
SDN based backhaul
Edge DC
Central DC
AFSDN APP y
SDN APP x
RE RE
SDI Control
RE
MM CM APPx…
MM: mobility mgmtCM: connectivity mgmt
RE: Resource Element
Logical Architecture
Orchestrator
VNF Manager
Virtualized Inf. Manager (VIM)
ETSI NFV MANORAN CORE
RU, DU
Physical Network
SDN based backhaul
Central DC
MME, S/PGW
GW-C
MME
eNB
PCRF
HSS
NE NE
SDN CTRL
CE
CE: Computation ElementNE: Network Element
Stat
e o
f th
e ar
t (r
esea
rch
) Fu
ll So
ftw
ariz
atio
n
(vis
ion
)
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Challenges to the enabling technologies
Challenges to specific technologies
SDN: scalability, flow aggregation, resilience, security
NFV/MEC: performance, placement, orchestration
Overall: flexibility, and dependability of dealing with dynamics
Both NFV and SDN were conceived for fixed/static environments
Software Networks: OK, but what exactly is in software?
Network: 1. Topology 2. Protocol Stacks 3. Routing
2: NFV, 3: SDN. What about 1?
SN: How to support structural dynamics, node and link churn
Expected 5G traits will bring such effects: small cells, front/backhaul
integration, V2X, mobile BS, cloud integration, virtual nodes, etc.
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Vision and Technological Gaps
Infrastructure (Switches/Routers, Hosts with Hypervisors, Storage)
Logical abstractions, slices, overlays, virtual objects
Higher Functions
Infrastructure
control
e.g. OpenFlow
Controller API (e.g. RESTful API)
“Controller North interface”
QoS Sec SPF App1 App2 AppN
Configuration
NETCONF
Allocs Catalog
Compute, storage and
link control
Others
“Controller South interface”
Discovery, failure detection, control traffic preservation, etc
Auto-organization
+Extensions
Low Level cApps
Topology
High Level cApps AAA Mobility Other 5G Apps Conn.
Sanity Checks, Access Control, Quotas, Verifications
Abstractions
Infrastructure layer
Carrier Grade SDN
Intelligent
orchestration
Control Plane
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Vision and Technological Gaps
Infrastructure (Switches/Routers, Hosts with Hypervisors, Storage)
Logical abstractions, slices, overlays, virtual objects
Higher Functions
Infrastructure
control
e.g. OpenFlow
Controller API (e.g. RESTful API)
“Controller North interface”
QoS Sec SPF App1 App2 AppN
Configuration
NETCONF
Allocs Catalog
Compute, storage and
link control
Others
“Controller South interface”
Discovery, failure detection, control traffic preservation, etc
Auto-organization
+Extensions
Low Level cApps
Topology
High Level cApps AAA Mobility Other 5G Apps Conn.
Sanity Checks, Access Control, Quotas, Verifications
Abstractions
Infrastructure layer
Carrier Grade SDN
Intelligent
orchestration
Control Plane
“Hardware” or Distributed Resources
OS Utilities
OS Kernel
Applications
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From Theory to Practice: 5G Testbed
We pursue a radical goal of tuneless, anchor-less and NFV-less mobility support in SDN
MCN support: service request, mobility, paging, etc.
1
2
3
4
Emulation Server (Mininet)
Log T1 (Packet_IN)
Log T2 (Request to Push Flows)
Log T3 (First UL Flowmod)
Log T4 (Last DL Flowmod)
Floodlight Controller
SDN APP
Controller Server
It could measure!
It also scales!
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Conclusions
We target a flexible, carrier grade, logical access core network
that becomes a unified platform for different instantiations of
connection, mobility, security and routing managements
Owned resources are dynamically integrated into a tenant control pool
These resources are usable over a layer cake of abstractions, starting
with low level abstractions (IaaS like) and going up to enriched APIs
Service, management and network applications run on the latter using
standard interfaces
We welcome partners and EC feedback to realize our vision and
prove technical feasibility and business viability through tests
and large scale trials in 5GPPP Phase II and, especially, Phase III
(show cases in Europe)
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