Ruckus Wireless SmartCell Gateway 200 User manual

Ruckus Wireless™
SmartCell Gateway™200
S2a Interface Reference Guide
for SmartZone 3.4
Part Number 800-71172-001 Rev A
Published July 2016
www.ruckuswireless.com

SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 2
Copyright Notice and Proprietary Information
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SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 3
Contents
About This Guide
Document Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Online Training Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Documentation Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1 Data Session and Path Management Messages
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Data Session Establishment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Path Management Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2 Tunnel Management Messages
Create Session Process Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Create Session Request Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Bearer Context - Create Session Request. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Create Session Response Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Bearer Context - Create Session Response Messages . . . . . . . . . . . . . . . . . . . . . . . 20
Modify Bearer Command Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Bearer Context - Modify Bearer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Modify Bearer Request Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Modify Bearer Request Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Bearer Context - Modify Bearer Request Messages . . . . . . . . . . . . . . . . . . . . . . . . . 22
Modify Bearer Response Message. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Bearer Context - Modify Bearer Response Messages . . . . . . . . . . . . . . . . . . . . . . . . 23
Update Bearer Process Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Update Bearer Request Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Bearer Context - Update Bearer Request Messages . . . . . . . . . . . . . . . . . . . . . . . . . 25
Update Bearer Response Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Bearer Context - Update Bearer Response Message . . . . . . . . . . . . . . . . . . . . . . . . 25
Delete Bearer Process Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Contents
SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 4
Delete Bearer Request Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Delete Bearer Response Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Bearer Context - Delete bearer response messages . . . . . . . . . . . . . . . . . . . . . . . . . 27
Delete Session Process Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Delete Session Request Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Delete Session Response Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Index

SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 5
About This Guide
This SmartCell Gateway™ (SCG) 200 S2a Interface Reference Guide describes the
interface between the SCG and the Packet Data Network Gateway (PDN-GW). It
also describes the control plane GPRS (General Packet Radio Service) tunneling
protocol messages.
This guide is written for service operators and system administrators who are
responsible for managing, configuring, and troubleshooting Ruckus Wireless
devices. Consequently, it assumes a basic working knowledge of local area
networks, wireless networking, and wireless devices.
NOTE If release notes are shipped with your product and the information there
differs from the information in this guide, follow the instructions in the release notes.
Most user guides and release notes are available in Adobe Acrobat Reader Portable
Document Format (PDF) or HTML on the Ruckus Wireless Support Web site at
https://support.ruckuswireless.com/contact-us.

About This Guide
Document Conventions
SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 6
Document Conventions
Table 1 and Table 2 list the text and notice conventions that are used throughout
this guide.
Terminology
Table 3 lists the terms used in this guide.
Table 1. Text conventions
Convention Description Example
monospace Represents information as it
appears on screen
[Device name]>
monospace bold Represents information that
you enter
[Device name]> set
ipaddr 10.0.0.12
default font bold Keyboard keys, software
buttons, and field names
On the Start menu, click All
Programs.
italics Screen or page names Click Advanced Settings.
The Advanced Settings page
appears.
Table 2. Notice conventions
Notice Type Description
NOTE Information that describes important features or instructions
CAUTION! Information that alerts you to potential loss of data or potential
damage to an application, system, or device
WARNING! Information that alerts you to potential personal injury
Table 3. Terms used in this guide
Terminology Description
AAA Authentication, Authorization, and Accounting
AMBR Aggregate Maximum Bit Rate
APN Access Point Name
DNS Domain Name System
EBI EPS Bearer ID

About This Guide
Terminology
SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 7
EPC Evolved Packet Core
EPS Evolved Packet System
F-TEID Fully Qualified Tunnel Endpoint Identifier
GPDU GTP Packet Data Unit
GPRS General Packet Radio Service
GSN APN GPRS serving node, is application module in the SCG handling
GTP messages
GTP GPRS Tunneling Protocol
GTPv1-U GTP version 1, user plane
GTPv2-C GTP version 2, control plane
IE Information Element
IMSI International Mobile Subscriber Identity
IP Internet Protocol
MCC Mobile Country Code
MNC Mobile Network Code
MSISDN Mobile Subscriber ISDN Number
PAA PDN Address Allocation
PCO Protocol Configuration Options
PDN Packet Data Network
PGW PDN Gateway
SGW Serving Gateway
ULI User Location Information
UMTS Universal Mobile Telecommunications Systems
UTRAN UMTS Terrestrial Radio Access Network
Table 3. Terms used in this guide
Terminology Description

About This Guide
References
SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 8
References
Table 4 lists the references used in this guide.
Legend
Table 5 lists the legend/presence used in this guide.
Related Documentation
For a complete list of documents that accompany this release, refer to the Release
Notes.
Online Training Resources
To access a variety of online Ruckus Wireless training modules, including free
introductory courses to wireless networking essentials, site surveys, and Ruckus
Wireless products, visit the Ruckus Wireless Training Portal at:
https://training.ruckuswireless.com
Table 4. References used
Serial
Number
Reference Description
1 29274-b20.docx • 3GPP TS 29.274 V11.2.0 (2012-03) 3GPP
Evolved Packet System (EPS)
• Evolved General Packet Radio Service (GPRS)
• Tunneling Protocol for Control plane (GTPv2-C)
• Stage 3 (Release 11)
Table 5. Legend/presence used in this guide
Legend/Presence/
Value
Description
C Conditional
Instance Value The Instance Value column indicates the instance number of the
IE, which is used in differentiating between two instances of same
IE, i.e., IE with the same type in the same message.
M Mandatory
O Optional

About This Guide
Documentation Feedback
SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 9
Documentation Feedback
Ruckus Wireless is interested in improving its documentation and welcomes your
comments and suggestions. You can email your comments to Ruckus Wireless at:
[email protected]
When contacting us, please include the following information:
• Document title
• Document part number (on the cover page)
• Page number (if appropriate)
For example:
• Ruckus Wireless Administrator Guide for SmartZone 3.4
• Part number: 800-71105-001
• Page 400

SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 10
1
Data Session and Path
Management Messages
In this chapter:
•Overview
•Data Session Establishment
•Path Management Messages

Data Session and Path Management Messages
Overview
SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 11
Overview
This reference guide describes the interface between the SmartCell Gateway (SCG)
with Packet Data Network Gateway (PDN-GW). It describes the control plane GPRS
(General Packet Radio Service) tunneling protocol messages v2 for EPS (Evolved
Packet System) interfaces (GTPv2-C) from the SCG and PGW. This guide lists all
the interface messages and GPRS Tunneling Protocol (GTP-C) information element
used between the SCG and PGW.
The S2a interface is used in control signaling between the SCG and PDN-GW
(Packet Data Network Gateway) as well as for tunneling end user data payload within
the backbone network between both the nodes in EPC (Evolved Packet Core)
network.
The GPRS Tunneling Protocol (GTP) transmits user data packets and signaling
messages between the SCG and PDN-GW. GTP encapsulates traffic and creates
GTP tunnels, which acts as virtual data channels for transmission of packet data
between the SCG and PDN-GW. A GTP tunnel is established between the SCG
and PDN-GW through Create Session Request procedure for a data session
initiated from UE.
The SCG acts as trusted non-3GPP access network (TWAN) towards PDN-GW
with S2a (GTPv2) interface. In case the operator EPC network does not support the
S2a interface, the SCG can be statically configured to support S5 (GTPv2) interface,
in which case the SCG acts as Serving Gateway (SGW).
A GTP tunnel is identified by a pair of IP addresses and a pair of GTP Tunnel End
Point Identifiers (TEIDs), where one IP address and TEID is for the SCG (TWAN) and
the other is for the PGW. The TEID is a session identifier used by GTP protocol
entities in the SCG and in the PGW. GTP separates signaling from payload. Traffic
is sorted onto a control plane (GTP-C) for signaling and a user plane (GTP-U) for
user data. GTP-C is a tunnel control and management protocol and is used to
create, modify and delete tunnels. GTP-U is a tunneling mechanism, which provides
a service for carrying user data packets. On both planes, a GTP header encapsu-
lates the data packet, called GTP Packet Data Unit (GPDU), and a path implemented
by UDP/IP is used as bearer of the GTP traffic. Figure 1 shows the deployment of
the SCG in operator networks with 3G and EPC.

Data Session and Path Management Messages
Overview
SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 12
Figure 1. Deployment of SCG with 3G and EPC
The SCG supports the following categories of GTP signaling traffic:
• Path Management Messages: The main purpose of these messages is to
supervise an UDP/IP path to ensure that connectivity failure can be detected on
time. This is managed by frequently sending GTP Echo or Echo response
packets between SCG and PGW.
• Tunnel Management Messages: These contain messages that establish, modify
and release GTP tunnels.
NOTE: The SCG support for STA interface is being considered for the future release.
NOTE: Refer to About This Guide for the conventions used in this guide.

Data Session and Path Management Messages
Data Session Establishment
SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 13
Data Session Establishment
Figure 2 depicts session establishment based on the session such as create, modify,
update and so on.
Figure 2. Data session establishment

Data Session and Path Management Messages
Path Management Messages
SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 14
Path Management Messages
Path management messages, monitors the health of the transport between GTP-
C peers, which is the SCG and PGW. Figure 3 shows the path management
messages process flow and Ta b l e 6 lists the attribute.
NOTE: GSN APP is GPRS serving node which is an application module in the SCG
for handling GTP messages.
Figure 3. Path management messages
Table 6. Echo request message
Attribute Presence Comment
Recovery M SCG/PGW updates the local restart counter in this
IE

SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 15
2
Tunnel Management Messages
In this chapter:
•Create Session Process Flow
•Modify Bearer Command Flow
•Modify Bearer Request Flow
•Update Bearer Process Flow
•Delete Bearer Process Flow
•Delete Session Process Flow

Tunnel Management Messages
Create Session Process Flow
SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 16
Tunnel management messages, manages the tunnel between GTP-C peers, which
includes create, update, modify and delete procedures.
Create Session Process Flow
Figure 4 shows the process flow for create session. This section covers:
•Create Session Request Messages
•Create Session Response Messages
Figure 4. Create session
Create Session Request Messages
Table 7 lists the create session request messages attributes. This section covers:
•Bearer Context - Modify Bearer
NOTE: The Instance Value column indicates the instance number of the IE, which
is used in differentiating between two instances of same IE, i.e., IE with the same
type in the same message.
Table 7. Create session - request messages
Attribute Instance
Value
Presence Interface(S2a,
S5 Both)
Description
IMSI 0 C Both IMSI of the subscriber.
MSISDN 0 C Both MSISDN received from HLR or AAA server
during authentication.

Tunnel Management Messages
Create Session Process Flow
SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 17
Serving
Network
0 C Both MCC and MNC as configured in the SCG
web interface. This attribute will not be
present if it is not configured in the SCG
web interface.
RAT Type 0 M Both For S5 interface value is 6 (EUTRAN) and
for S2a interface the value is 3 (WLAN).
Indication 0 C Both Value is set to zero.
F-TEID 0 M S2a Sender F-TEID for control plane, SCG
generated TEID
F-TEID 1 M S5 Sender F-TEID for control plane, SCG
generated TEID
APN 0 M Both Access Point Name (APN), APN NI+OI
Selection
Mode
0 C Both The value shall be set to “MS or network
provided APN, subscription verified”
PDN Type 0 C S5 Set to IPV4
PAA 0 C Both PDN Address allocation, set to 0.0.0.0
AMBR 0 C Both Aggregate Maximum Bit Rate (APN-
AMBR), configurable in ttg_pdg.cfg
Bearer Context M Both Bearer context is created
Recovery 0 C Both This attribute is included if its contacting the
peer node for the first time
Charging
Characteristics
0 C Both Mandatory in case of SCG, CC received
form HLR/HSS or default value in SCG if
not received form external entity
Maximum APN
Restriction
0 C S5 Value is set to zero, this value is set to the
least restrictive type
User Location
Information
(ULI)
0 C S5 User Location Information (ULI), MCC MNC
from UE realm
Table 7. Create session - request messages (Continued)
Attribute Instance
Value
Presence Interface(S2a,
S5 Both)
Description

Tunnel Management Messages
Create Session Process Flow
SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 18
Bearer Context - Create Session Request
Table 8 lists the attributes of bearer context for create session request messages.
Create Session Response Messages
Table 9 lists the attribute for create session response messages. This section covers:
•Bearer Context - Create Session Response Messages
Table 8. Bearer context - request messages
Attribute Instance
Value
Presence Interface Description
EBI 0 M Both EPS Bearer ID
Bearer QoS 0 M Both Bearer Level QoS
F-TEID 2 C S5 S5-U SGW F-TEID
F-TEID 6 C S2a S2a-U TWAN F-TEID
Table 9. Create session response message
Attribute Instance
Value
Presence Interface
(S2a, S5, Both)
Description
Cause 0 M Both Cause in response message.
Change Reporting
Action
0C S5
F-TEID 1 C Both Includes the TEID in the GTP based
interfaces
PAA 0 C Both PDN Address Allocation
APN Restriction 0 C S5 APN restriction
AMBR 0 C Both Aggregate Maximum Bit Rate (APN-
AMBR), is included only if the received
APN-AMBR is modified by the PCRF.
Charging Gateway
Address
0 O S5 PGW may include CGF IP address
provided the CGF server IP address
is configured in the user interface. The
SCG sets this server with highest
priority, for sending generated CDR's.
Bearer Context 0 M Both Includes the QoS, Charging ID along
with other attributes

Tunnel Management Messages
Create Session Process Flow
SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 19
Recovery 0 C Both Included only if the peer node is
contacted for the first time.
FQDN 0 C S5 Charging gateway name
IP Address 0 C S5 Charging gateway address
Protocol
Configuration
Options (PCO)
0 O S2a PGW could include this IE on the S2a
interface to provide TWAN with
additional IP configuration
parameters (example, DNS server).
This IE is included provided a
corresponding request is received in
the Create Session - request
message.
EPC Timer 0 O S5 PGW Back-Off Time, PDN-GW
rejects the Create Session Request
with the cause “APN congestion”. It
indicates the time during which the
peer should refrain from sending
subsequent PDN connection
establishment requests to the PGW
for the congested APN for services
other than Service Users/emergency
services.
Note: Not supported in this release
IPv4 Configuration
Parameters
(IP4CP)
0 CO S2a Trusted WLAN IPv4 Parameters
Note: Not supported in this release
Private Extension 0 O Both Private Extension
Note: Not supported in this release
Table 9. Create session response message (Continued)
Attribute Instance
Value
Presence Interface
(S2a, S5, Both)
Description

Tunnel Management Messages
Modify Bearer Command Flow
SCG™ 200 S2a Interface Reference Guide for SmartZone 3.4, 800-71172-001 Rev A 20
Bearer Context - Create Session Response Messages
Table 10 lists the bearer context attributes for create session response messages.
Modify Bearer Command Flow
Figure 5 shows the modify bearer process flow. Tab le 11 lists the modify bearer
attributes. This section covers:
•Bearer Context - Modify Bearer
Figure 5. Modify bearer
Table 10. Bearer context for create session response messages
Attribute Instance
Value
Presence Interface
(S2a, S5, Both)
Description
Cause 0 M Both Cause in response message.
EBI 0 M Both EPS Bearer ID
Bearer QoS 0 C Both Bearer Level QoS
TFT 0 O Both Bearer modification and TFT
change
F-TEID 2 C S5 S5-U PGW F-TEID
F-TEID 5 C S2a S2a-U PGWF-TEID
Charging ID 0 O Both Charging ID
Bearer Flag 0 O S5 Bearer flag