softwarisation of the ground segment system for combined ... wwrf/meetings/past...
Post on 09-Oct-2020
0 Views
Preview:
TRANSCRIPT
Special Session on “Satellite communications for 5G and beyond”39th Meeting of the Wireless World Research Forum, Castelldefels, Spain, 18-20 October 2017.
Softwarisation of the ground segment system
for combined terrestrial-satellite
communications networks
R. Ferrús, O.Sallent
Universitat Politècnica de Catalunya, Spain
Special Session on “Satellite communications for 5G and beyond”39th Meeting of the Wireless World Research Forum, Castelldefels, Spain, 18-20 October 2017.
• Introduction
• NFV/SDN applicability into satcoms: VITAL Project
• Case study of NFV applicability
• Case study of SDN applicability
• Conclusions
Outline
2
Special Session on “Satellite communications for 5G and beyond”39th Meeting of the Wireless World Research Forum, Castelldefels, Spain, 18-20 October 2017.
Introduction: Role of satellite communications in 5G
• The role that satellite communications can play in the forthcoming 5G
ecosystem is being revisited
• The satellite communications industry pushing for better satellite-terrestrial cooperation as part of mobile networks of 2020
• Remarkably, a requirement for next generation 3GPP systems to be able to provide services using satellite access included within the normative Stage 1 requirements and on-going study item to address the support of non-terrestrial networks in 5G New Radio (NR) specifications
• Wide area service coverage and high availability of SatComs are well suited to
serve future 5G networks:
• Foster the roll out of 5G in un-served areas (e.g. remote areas, on-board aircrafts/vessels) and underserved areas (e.g. rural areas)
• Reinforce 5G service reliability by providing service continuity and ensuring service availability anywhere (e.g. disaster relief, critical communications)
• Enable 5G network scalability by providing efficient multicast/broadcast resources for data delivery towards network edges
In combination with terrestrial network
technologies !
3
Special Session on “Satellite communications for 5G and beyond”39th Meeting of the Wireless World Research Forum, Castelldefels, Spain, 18-20 October 2017.
VITAL Project Scope
Introduction: Technical progress from many angles
• Advances in satellite payload technologies− E.g. More powerful GEO HTS satellites taking capacities from 100’s Gbps to over a
Terabit/s with hundreds of spotbeams, enriched board signal processing and reconfigurable payload features to meet changing traffic patterns and demands.
− E.g. Expectations of over 100 HTS systems in orbit By 2020-2025, delivering Tb/s of connectivity in Ku- and Ka- bands at reduced cost.
• Alternative constellation architectures, involving hybrid and new mega-
constellations− E.g. A large number of low-cost micro-satellites is expected to come to fruition in the
forthcoming years, anticipating a further capacity cost reduction and improved performance in terms of latency.
• Improved satellite and terrestrial integration − E.g. Higher degree of radio interface commonality and tighter operational integration with
5G system architecture and NR specifications
− E.g. Adoption of mainstream networking technologies within satellite networks such as SDN and NFV, in line with the advances in network softwarisation technologies being consolidated in the 5G landscape.
4
Special Session on “Satellite communications for 5G and beyond”39th Meeting of the Wireless World Research Forum, Castelldefels, Spain, 18-20 October 2017.
NFV/SDN applicability into satcoms: VITAL Project
5
• VIrtualized hybrid satellite-TerrestriAlsystems for resilient and fLexible future networks (VITAL)
• H2020 RIA (Research and Innovation Action) Project – ICT 2014-1
• Duration: Feb 1, 2015 – July 31, 2017 (30 months)
• Budget: 2,9 MEuros
• Resource: 341 PM effort
• Project Coordinator: Tinku Rasheed/Roberto Riggio, Create-Net
• Website: https://ict-vital.eu
• Twitter: VITAL Project @H2020_VITAL
“The central goal of VITAL is the research, implementation and demonstration ofimproved integration capabilities for the hybrid combination of terrestrial and satellitenetworking infrastructures through the introduction of NFV/SDN paradigms andtechnologies into the satellite domain”
Special Session on “Satellite communications for 5G and beyond”39th Meeting of the Wireless World Research Forum, Castelldefels, Spain, 18-20 October 2017.
NFV Applicability: Virtualised Satellite Network Concept
6
VSN SDN controller
VSN NCC
VSNSDN switch(es)
VSN NMS/EMS
SBG PNF
Exposed VSN management interfaces
Exposed VSN control interfaces
Data plane interfaces
SBG-VNF
SBG-VNF
SBG PNF
SNF-VNFSNF-VNF
SNF-VNF
Deployed in common purpose HW
RF subsystem
A VSN is a satellite
network in which most
of their functions are
supplied as VNFs
running in a distributed
NFV Infrastructure
(NFVI) and in which
control and
management
capabilities are
supported and exposed
through SDN-based
interfaces.
(Control plane)
(Management plane)
(Satellite network
functions e.g. optimization, security, etc)
(Satellite BB
Gateway with Link Layer Functions)
(Satellite BB Gateway with Physical LayerFunctions)
RF subsystem
Deployed in purpose-specific HW
Satellite
Gateway
Functions
Special Session on “Satellite communications for 5G and beyond”39th Meeting of the Wireless World Research Forum, Castelldefels, Spain, 18-20 October 2017. 7
NFV Applicability: Management and Orchestration Architecture
Management and orchestration architecture for the composition and lifecycle management of VSN
Key features:• Multi-tenancy
(network slicing)• Dynamic
customisation(VSN as a Service)
VSN#m
VSN#k
Te
rmin
al s
ide
(e
.g. L
AN
ne
two
rk)
Ne
two
rk s
ide
(e.g
. WA
N li
nks
)
…
SBG-PNF Controller
(SBGC)
SBGC-VSNSBGC-SBG
NFV Manager
Or-Vi, Vi-Vnfm
Ve-Vnfm-em, Ve-Vnfm-vnf
SO-NVFM
SO-SBGC
SO-VSN
Service Orchestrator(SO)
Federated Network Resource Manager
(FNRM)
SNO’s OSS/BSSDashboard/Customer portal
xD-F
M-F
A /
xD-F
A-S
O
xD-FA-SO/ internal
NFVI
CentralisedNFVI-PoPs
Transport network
SBGPNF
…
Physical network infrastructure with virtualization support
NFVISBGPNF
RF gateway
Lightweight NFVI-PoP
ST
VIM
VIM
WIM RF gateway NFVI
VIM
NFVIVIM
Edge NFVI-PoPs
xD-C
&M
-itf
VSN#n
Special Session on “Satellite communications for 5G and beyond”39th Meeting of the Wireless World Research Forum, Castelldefels, Spain, 18-20 October 2017. 8
NFV Applicability: Implemented components
vWOC
A satellite PEP VNF that optimizes the traffic to reduce the perceived satellite
delay, via TCP optimization, data compression or Data Redundancy
Elimination (DRE).
SW
vHYAA multi-link traffic distribution VNF with flexible rules to balance user traffic
across terrestrial and satellite links.SW
vVPNAn IPSec VNF preventing eavesdropping via sessions tunnelling and
encryption. SW
3 VNFs implemented
Data Models and Descriptors
Code implementation of the NFV
Manager and FNRM
GUIs
Special Session on “Satellite communications for 5G and beyond”39th Meeting of the Wireless World Research Forum, Castelldefels, Spain, 18-20 October 2017. 9
NFV Applicability: Experimental testbeds
External network
(TCP clients)
NFVI-PoP at central location
Lightweight NFVI-PoP for user location
External network
(File server)
vVPN
vHYA
vWOC
vVPN
vHYA
vWOCTerrestrial Link
Satellite Link
(Real Connection @CNES premises and emulated connection with OpenSAND
Title/ID Description Observed KPI
Test 1: Satellite
only, using the
satellite link
alone
Stops the terrestrial link,
starts the satellite link on the
edge vHYA VNF .and
launches the SSH test
The elapsed and
expected SSH
durations for the
3 SSH scenarios
Test 2:
Terrestrial only,
using the
terrestrial link
alone
Starts the terrestrial link,
stops the satellite link on the
edge vHYA VNF, and
launches the SSH test
The elapsed and
expected SSH
durations for the
3 SSH scenarios
Test 3:
Terrestrial +
satellite
Starts the terrestrial and
satellite links, on the edge
vHYA VNF. Enables
MPTCP with
PSBOL+Offload path
selection on both the core
and edge vHYA VNFs, and
launches the SSH test
The elapsed and
expected
download
durations
Lightweight NFVI-PoP at terminal side
(OA Whitebox Platfotm)
Special Session on “Satellite communications for 5G and beyond”39th Meeting of the Wireless World Research Forum, Castelldefels, Spain, 18-20 October 2017.
• Mobile backhauling is a compelling scenario for the exploitation of SDN-based satellite
networks
• Satellite capacity can be used to complement the terrestrial infrastructure for reaching remote/rural areas, more
efficient multicast traffic delivery, increased resiliency and better support for temporary cell deployments and
moving cells
• The exposition of SDN-based interface for satellite connectivity management would allow
a MNO to easily integrate and operate the satellite component within its backhauling
infrastructure progressively relying on SDN technologies for the terrestrial capacity
counterpart.
10
SDN Applicability: E2E SDN-based TE in satellite-terrestrial
backhaul networks
Internet
NE#B NE#C
NE#A
TEApplications
(PCE) …
SDN controller(s)
Mobile Core Network Applications (e.g., MME, S/P-GW)
VSN
Mobile terminal RAN node(e.g. BS)
xD-C&M-itf
Special Session on “Satellite communications for 5G and beyond”39th Meeting of the Wireless World Research Forum, Castelldefels, Spain, 18-20 October 2017. 11
SDN Applicability: SDN-based satellite network architectures
• A SDN architecture of a VSN has been detailed, assessing the pros and cons of candidate SDN data models, protocols and Application Program Interfaces (APIs)
NCC App
ST
ST
ST
…
Satellite payload
…
NMC App
G
G
T
U/UST
U/UGW
NM
T
T
T
T
L3 and/or L2 packets
BSM Bearer Service (QID, QoS profile)
SDN Controller
SBI for theM&C of Interworking and Adaptationfunctions
Satellite Network Connection/Flow (Traffic Flow Template, QoS profile)
NBI for theM&C of Connection/FlowService
Gateway ST
ST U-plane
SD Lower Layers
Interworking& AdaptationST
M-p
lan
e
ST C
-pla
ne
SI-SAP
SI-SAP
SI-SAP
Gateway ST
ST U-plane
SD Lower Layers
Interworking& AdaptationST
M-p
lan
e
ST C
-pla
ne
SI-SAP
SI-SAP
SI-SAP
…
User ST
ST U-plane
SD Lower Layers
Interworking& Adaptation S
T M
-pla
ne
ST
C-p
lan
e
SI-SAP
SI-SAP
SI-SAP
User ST
ST U-plane
SD Lower Layers
Interworking& Adaptation S
T M
-pla
ne
ST
C-p
lan
e
SI-SAP
SI-SAP
SI-SAP
U/UGW
U/UST
U/UST
U/UST
Models/Protocols/APIs assessed:• ETSI BSM SI-SAP• ONF OpenFlow• ONF Microwave Information
Model• ONF Transport API• IETF YANG models for traffic
engineered networks
Special Session on “Satellite communications for 5G and beyond”39th Meeting of the Wireless World Research Forum, Castelldefels, Spain, 18-20 October 2017. 12
SDN Applicability: Integration approach for E2E TE
“Satellite Network Switch”
…
NE#B
Satellite Network Connection/Flow (Traffic Flow Template, QoS profile)
NE#A
MNO’s SDN controller
NE#C Gi
CSR
eNB
RAN node #B
Switching/Routing
functions
Switching/Routing
functions
eNB
RAN node #C
eNB
RAN node #A
GW
SatelliteL1/L2
GWSwitching/Routingfunctions
Switching/Routing
functions
Switching/Routingfunctions
TEApplications
(PCE)
Mobile Core Network
Applications
Mobile network control protocols(e.g., S1-MME for LTE eNB)
Controller API
Internet
SDN Controller
ST
ST
ST
NCC
NMC
NBI for theM&C of Connection/FlowService
Integration approach: • VSN connectivity abstracted as an
OpenFlow switch• The operation of the MCN is supported
through SDN-based TE applications with a central Path Computation Engine (PCE).
Special Session on “Satellite communications for 5G and beyond”39th Meeting of the Wireless World Research Forum, Castelldefels, Spain, 18-20 October 2017. 13
SDN Applicability: Flow activation workflow
Internet
TEApplications
(PCE)
MNO’s SDN controller
Mobile Core Network
ApplicationsNE#A NE#B NE#C
2. Decision to establish a
dedicated EPS bearer
3. Path establishment request
“Satellite NetworkSwitch”
RAN node#B
4. Selection of best path
6. Path establishment response7. RAB activation (e.g. S1-MME protocol)
1. Network monitoring
5. OpenFlowcommands
8. Established data path for the dedicated EPS bearer
UE
Activation of a service with optimal path computation
Special Session on “Satellite communications for 5G and beyond”39th Meeting of the Wireless World Research Forum, Castelldefels, Spain, 18-20 October 2017. 14
SDN Applicability: Formulation and Assessment of a SDN-
based TE application
• The SDN-based TE application exploits a combination of control features and criteria:
• end-to-end path computation;
• satellite capacity resource reservations;
• allocation criteria depending on the traffic nature;
• admission control and rate control features; and
• network utility maximization criteria.
• Performance assessment under diverse scenarios, including homogeneous and non-homogeneous load situations, terrestrial link failures in some of the BSs and deployment of a number of transportable BSs that exclusively rely on the satellite capacity for backhauling.
• Compared to more traditional overflow strategies, the SDN-based TE application is able to provide a higher network utility in most of the analyzed cases, greatly improving the admission rejection ratio for GBR services and achieving higher fairness in the distribution of Non-GBR data rates
Special Session on “Satellite communications for 5G and beyond”39th Meeting of the Wireless World Research Forum, Castelldefels, Spain, 18-20 October 2017.
Conclusions
• VITAL results clearly advocate for the need to transition satellite network
equipment to NFV deployable software components and outfit them with a set
of control and management functions and interfaces (API and/or network
protocols) compatible with the mainstream SDN architectures and
technologies being adopted in 5G in order to realize a full E2E networking
concept.
• While VITAL work has established good basis for formulation and
assessment of potential benefits of a number of diverse SDN/NFV resource
management features, further work is still needed towards a full realization of
these concepts by developing and testing pre-operational SDN/NFV-enabled
satellite network systems that can seamlessly become a constituent part of
5G software network infrastructures.
15
Special Session on “Satellite communications for 5G and beyond”39th Meeting of the Wireless World Research Forum, Castelldefels, Spain, 18-20 October 2017.
Thank you for your attention
Ramon Ferrús
ramon.ferrus@upc.edu
16
Acknowledgements
This document has been produced in the context of the H2020 VITAL project. The VITAL project consortium would like to acknowledge that the research leading to these results has received funding from the European Union’s H2020 Research and Innovation Programme (H2020-ICT-2014-1) under the Grant
Agreement H2020-ICT-644843.
top related