The SGW Nodal Test Case

The Serving Gateway (SGW) routes and forwards user data packets. During inter-eNode B handover, SGW acts as the mobility anchor for the user plane and also acts as an anchor for mobility between LTE technology and other 3GPP technologies (terminating S4 interface and relaying the traffic between 2G/3G systems and PDN GW). When the UE is in idle state, the SGW terminates the DL data path of the UE and triggers paging when DL data arrives for the UE. It manages and stores UE contexts, e.g. parameters of the IP bearer service, network internal routing information.

Serving Gateway Nodal Testing (LTE)

The Serving Gateway is the node that terminates the interface towards EUTRAN. For each UE associated with the EPS, at a given point of time, there is one single Serving Gateway.

A Serving Node choice is available in SGW Nodal, if an implementation is licensed for GGSN Nodal. The choices of Serving Node being either an MME (S11) or an SGSN (S4) are included. The S11 interface provides a reference point between MME and Serving GW. Direct Tunnel is assumed in the case of an SGSN, and the RNC establishes a GTP-U tunnel with the SGW.

S1 Intra-SGW Handoff

Serving Gateway Nodal Testing (3GPP)

The Serving Node is an SGSN (S4), where Direct Tunnel is assumed and the RNC establishes a GTP-U tunnel with the SGW.

SGW Nodal — S1 Inter-SGW Handoff

The Serving Node is a MME (S11), where Direct Tunnel is assumed and the Serving Gateway establishes a GTP-U tunnel (S5/S8) with the PDN GW. The Target Serving Gateway establishes a GTP-U tunnel (S5/S8) with the PDN GW.

SGW Nodal EUTRAN — UTRAN/GERAN Handoff (New PDN GW)

The SGW Nodal EUTRAN – UTRAN/GERAN Handoff testing requires the following test cases:

LTE Gateway Test Application
GPRS Test Application
PCRF Node Emulation (optional)
IP Data Test Application (optional)

NOTES:

Supports for both Iu and Gb SGSNs.
If PDN GW is a real node, an SGi interface to the NH is provided.

SGW Nodal EUTRAN — UTRAN/GERAN Handoff (New SGW)

The SGW Nodal EUTRAN – UTRAN/GERAN Handoff testing requires the following test cases:

LTE Gateway Test Application
GPRS Test Application
PCRF Node Emulation (optional)
IP Data Test Application (optional)

NOTES:

Supports for both Iu and Gb SGSNs.
If PDN GW is a real node, an SGi interface to the NH is provided and a Gx interface to the PCRF.

Mobile Equipment Identity Check – SGW Nodal

Context of Use in SGW Nodal test case

After initial attach, MME/SGSN sends an identity check request to the Equipment Identity Register (EIR) to identify the device.

When EIR Interface is enabled (before sending a ULR), the equipment check request is sent to the EIR.
If HSS I/F (authentication) is also enabled, the ECR is only sent if authentication is successful.
If the ECR is successful, the ULR is sent.
If the HSS I/F is not enabled, then the ECR is sent upon initial attach request.

SGW Nodal, HSS Node (LS/SUT)

HSS Node responds to the request with equipment status and result code.

Main Success Scenario

Relay UE Test

Enable LTE Relay UE on SGW Nodal Test Configuration to Support Relay UE architecture A - Alt 1 as described in section 4.2.1.1 [TS 36.806].

In the architecture shown in Figure, DUT(SUT)is Relay-UE’s SGW/PGW.

In Architecture A - Alt1,

- the S1-MME interface is unmodified. It terminates at the relay node after being tunnelled through a bearer on the Un interface.

- The X2 interface is also unmodified. Likewise, it terminates at the relay node after being tunnelled through a bearer on the Un interface.

With this test case, you define:

The network environment
The session volume and rates, and an optional rate distribution model
Control protocol attributes and behaviors

Measurements collected for this test case include:

Counters that record the number and types of messages sent and received
Number of messages discarded by the MNs while the test server was in an overload condition
Number of Binding Acknowledgements received by the MNs
Errors encountered during the test

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Test Options

When your test activity measures processing capability rather than rates, you can expand the scope of the test:

Add Data Traffic to the test to more closely simulate a live network using various wireless applications and protocols.
Encrypt Data Traffic with the optional Dynamic IPSec feature.
Select PGW Emulation checkbox for control node availability (Bearer IP Address Pool is only available when emulation is on). The PGW Emulation checkbox is not available when Test Activity is Inter Technology Mobility and UMTS Version 7. Select the optional PGW Gx Interface, which becomes available when PDN GW Selection is selected and choose the appropriate PCRF SUT and

For Inter technology Mobility, the LTE Initial Network with UMTS Version 7 provides S11 and Gn interfaces. Also the S1-U IPSec selection provides you with an option to encrypt data between eNodeB and MME using the S1-U interface.

Use the SUT Query option to monitor the CPU utilization of an SUT, and determine the amount of activity that the SUT can handle within a given CPU threshold.

Measurements

Measurements collected for the SGW Nodal test case are reported on the following tabs. Additional measurements may be available depending on the test activity and options executed with the test case.