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Integrate OAI-as-a-Service into M-CORD
Wilson Wang﹒Chien-Hao Chen﹒Wei-Yu Chen﹒Ching Tang
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About Us
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● Wilson Wang (ITRI / NCTU)
● Chien-Hao Chen (ITRI)
● Jimmy Wen (ITRI)
● Wei-Yu Chen (NCTU)
● Ching Tang (NCTU)
● Yih-Jye Chiu (NCTU)
Outline
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1. Introduction to Open Air Interface
2. Objective and Demo Scenario
3. Implementation of OAI-as-a-Service M-CORD
4. Future Work
Introduction to Open Air Interface
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● Composition of OAI
● Software Defined Radio
● OAI EPC Features
● OAI LTE Software Stack
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OAI-OpenAirInterface
Raymond Knopp Navid Nikaein
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Composition of OAI
LTE Network ArchitectureEvolved Packet Core
eNBUE MME HSS
S-GW P-GW Internet
OAI Architecture
SDR SDR
OAI UE OAI eNB OAI EPC
Internet
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SDR-SoftwareDefinedRadio
● Express MIMO2-Eurecom○ http://www.expressmimo2.com/
● USRP B210-Ettus Research○ https://www.ettus.com/product/details/UB210-KIT
● USRP X310-Ettus Research○ https://www.ettus.com/product/details/X310-KIT
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OAI EPC Features
● MME, HSS, SGW and PGW implementations
○ Compatible with 3GPP R10
● UE procedures handling: attach, authentication, service access,
radio bearer establishment
● Configurable access point name, IP range, DNS and E-RAB QoS
● IPv4 and IPv6 support
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OAI LTE EPC Part Software Stack
Objective and Demo Scenario
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● Objective
● Demo Scenario
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Objective
● Verify service function chain
a. Build MCORD-in-a-Box 4.1 for 1st prototype version
b. Use OAI EPC as the M-CORD Service
c. Divide OAI EPC into MME, HSS, and S/PGW
d. Accomplish end-to-end integration test
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DEMO Scenario
● Two Commercial UE + OAI eNB (x86 PC) + OAIaaS M-CORD
● UE can access the Internet at the same time
● Performance:
○ UE to S/PGW RTT: 21.9 ms
○ Bandwidth: 4 Mbps (limited by OAI eNB)
x310
X86
MobileCORD-in-a-box
PCIe LAN
HSSMME
SPGW
OAI eNB OAI EPC
Implementation of OAI-as-a-Service M-CORD
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● Mobile CORD architecture
● Service dependency
● Onboard oai service
● Connection from eNodeB to instances
● Connection from instances to Internet
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Mobile CORD Architecture
Openstack ONOS
Leaf-spinefabric
XOS
VirtualizedEPC
VirtualizedRAN
Mobile EdgeService
AccessLink
CoreLink
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Services Dependency
eNB
Internet
MME HHS
S/P-GW
Evolved Packet Core
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Onboarding Services - Create Synchronizer
corddev headnode
Local images
Docker RegistryServiceSychronizer Image
oai servicesource code oai service synchronizer
pull & runbuild
publish
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Onboarding Services - Create Service Instance
headnode compute node
OpenStacksynchronizer
XOS
OpenStackcomponents
OAITOSCAYAML
file
OAI Service InstancevHSS
OAI Service InstancevMME
OAI Service InstancevSPGW
OAI Servicesynchronizer
Service Synchronizers
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● How to create an openstack images
● How the synchronizer works
● More works can be done by synchronizers
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Create an Openstack Image
1. Build an Ubuntu vm with libvirt
2. Install openstack image tools: cloud-init
a. Read metadata, put public key for synchronizer uses.
3. Install whatever you needs.
4. virt-sysprep: clean-up all configs. e.g. network, ssh-keys, ...
5. QEMU Disk utility: qemu-img
a. For convert image format & compress image
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Service Synchronization Procedure
● Synchronizer
○ Wait for dependent instances IP addresses ready
○ Prepare service-related configurations
○ Execute Ansible playbook
■ Create OAI configuration files & data
■ Enable OAI as a systemd service
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Synchronizer: Wait for Dependent Instance
● HSS step depends on HSS IP
● SPGW step depends on SPGW IP
● MME depends on HSS & SPGW & MME IP
Only executed when dependent instance is ready
MME HSS
SPGW
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Make Instances Know Other’s IP
● Render IP variables in playbook
○ MME_PRIVATE_IP
○ MME_PUBLIC_IP
○ HSS_PRIVATE_IP
○ HSS_PUBLIC_IP
○ SPGW_PRIVATE_IP
○ SPGW_PUBLIC_IP
○ OAI_SERVICE_TYPE
Synchronizer: Prepare Service Configurations
Service-related data will then be injected into Ansible
HSSmodel
MMEmodel
SPGWmodel
HSSsync step
MMEsync step
SPGWsync step
SIM data APN dataMCC MNC
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Ansible: Create OAI Configurations & Data
HSS SPGW MMEhss.conf
spgw.confmme.conf
hss_fd.confoai.sql mme_fd.conf
set host name & hosts
Configuration files are generated from templates
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spgw iphss ip
HSSmodel
MMEmodel
SPGWmodel
HSSsync step
MMEsync step
SPGWsync step
HSSinstance
MMEinstance
SPGWinstance
Deploy Service Based on Service Models
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SIM data MCC MNC APN data
hss.conf mme.conf spgw.conf
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Ansible: Enable OAI as a Systemd Service
Generate systemd service configuration & enable it
Systemddefinition
Ansiblegenerate
enable
OAIprogram
reference
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Connection from eNB to Instances
Physical Server
Compute Node
overlay ovsfabric
underlay ovs
vHSS10.0.14.2
vMME10.0.14.3
vSPGW10.0.14.4
head node
eNodeBvxlan
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The Instance Networking
Physical ServerCompute Node
overlay ovsfabricunderlay
ovs
vHSS10.0.14
.2
vMME10.0.14
.3
vSPGW10.0.14.
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head node
eNodeB
● In TOSCA yaml, we assign 3 different networks to each instance
○ management
○ oaiservice_network
■ vHSS, vMME, vSPGW communicate with this network
○ public
■ vSPGW outgoing traffic’s interface
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Connection from Instances to Internet
Physical Server Compute Node
overlay ovsfabricunderlay ovs
vHSS10.0.14.2
vMME10.0.14.3
vSPGW10.0.14.4
head node
eth0 eth1
virbr1
Future work
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● Make Services into CORD-POD
● Create Corresponding Services for EPC Components
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Migrate OAI Services to CORD-POD
● High Performance
● Scalable
● Physical data plane
● Bring OAI-MCORD to the real world
● How to migrate?
○ Build a CORD-POD
○ Add fabric service
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Create Corresponding service for EPC components
● Make OAI Service as CORD spirit
● Service Isolation
○ Easy management
● Network Slicing
● Service dependency
● Real automation
