Wireless 2G Core Network

IP Network Simulation

MAPS™ GPRS Gb Interface Emulator

Simulation of GPRS Gb interface connecting BSS (Base Station Subsystem) and SGSN (Serving GPRS Support Node) network elements handling PS mobile traffic.

  Brochure

Overview

GPRS, or General Packet Radio Service, was introduced (in the late 90's and early 2000's) to enhance data carrying capabilities of the basic GSM Network.  Initially it used the conventional T1 E1 transport and frame relay protocol. Also as the wireless infrastructure evolved towards IP, the migration of 2G systems to IP interface provided many advantages including increased throughput, capacity, and economy.

To permit our customers to emulate, test, and verify GPRS Gb over IP, GL offers MAPS™ GPRS Gb (PKS131), a multi-protocol, multi-technology platform that also supports many other protocol families including TDM, IP, ATM, and Wireless.

MAPS™ GPRS Gb supports simulation of BSS (Base Station Subsystem) and the SGSN (Serving GPRS Support Node) network elements over IP transmission protocol. MAPS™ GPRS Gb also supports SGSN Pooling feature to test and verify redundancy, load balancing, and scalability of network. SGSN pooling solution overcomes the restriction of a BSC node connecting to just one SGSN. It introduces a new routing mechanism which allows a BSC belonging to an SGSN Pool, connect to all SGSNs in that pool. This permits a mobile station to roam freely without a need to change the serving SGSN.  

Besides testing network elements (SGSN and BSS), the tester also involves error tracking, regression testing, and load testing/call generation. MAPS™ GPRS Gb interface Emulator supports various procedures including Network Service Control, Identity Check, Combined GPRS / IMSI Attach, and Routing Area Update. It can run pre-defined test scenarios against the interface test objects in a controlled & deterministic manner.

MAPS™ GPRS Gb Interface Emulator supports powerful utilities like Message Editor, Script Editor, and Profile Editor which allow new scenarios to be created or existing scenarios to be modified as per the protocol standards listed in the table below.

MAPS™ GPRS Gb supports ETH103 - Mobile Traffic simulation over Gb interface between BSC and SGSN. Currently, this module transmits the pre-canned HTTP file (*.txt) between BSC and SGSN nodes. It multiplexes both signaling and traffic over Gb interface.

By mimicking real-world customer behavior in lab environments, our solutions allow mobile operators and equipment manufacturers to verify their wireless networks before deployment. In other words, one can setup a virtual real-time network simulating all the network elements using MAPS 2G Wireless Lab Suite. The test suite supports simulation of Gprs Gb, Gn Gp, and other interfaces in GPRS network required to simulate PS data traffic.

GL also provides an independent GUI based GPRS protocol analyzer -TDM (optional application – XX155) and GPRS protocol analyzer – IP  (optional application – PKV103) for online capture and decode of the signaling in real-time and as well as offline.

Main Features

  • Setup a virtual real-time network simulating 2G-GSM GPRS network elements using ‘MAPS™ 2G Wireless Lab Suite
  • Simulates SGSN (Serving GPRS Support Node) and BSS (Base Station Subsystem) elements in GPRS Gb interface over IP.
  • Simulates Control plane Gb mode.
  • Supports SGSN pooling to test and verify redundancy, load balancing, and scalability of network
  • Generates hundreds of Control Signaling (Load Testing).
  • Generates and processes NS (Network Service), BSSGP (Base Station Subsystem GPRS Protocol), and various GPRS session procedure messages.
  • Supports Gb interface procedures including Network Service Control, Identity Check, Combined GPRS / IMSI Attach, and Routing Area Update
  • Insertion of impairments to create invalid messages.
  • Supports GTP Traffic (GTP User Plane Data) which includes: verification like BERT testing, HTTP traffic generation capability, GGSN can actually be connected to real IP network to simulate Gateway testing
  • Supports customization of call flows and message templates using Script and Message editors.
  • Supports scripted call generation and automated call reception.
  • Provides Call Statistics and Events Status.
  • Automation, Remote access, and Schedulers to run tests 24/7

Applications

  • Complete analysis and simulation capability.
  • Provides fault insertion, and erroneous call flows testing capability.
  • Functional testing, Regression testing and Conformance testing of network elements.
  • Ready scripts makes testing procedure simpler, less time consuming and hence time to market products.
  • QoS requests for greater or lesser bandwidth.
  • GSM GPRS lab setup can be used in educational institutions for training purposes

Supported Protocols Standards

Gb Interface Protocol Standards

    • BSSGP - Base Station Subsystem GPRS Protocol
    • NS – Network Service
    • LLC - Logical Link Control
    • SNDCP - Sub Network Dependent Convergence Protocol
Supported Protocols Specification Used
BSSGP 3GPP TS 08.18 V8.10.0 (2002-05)
LLC 3GPP TS 04.64 V8.7.0 (2001-12)
NS (Network Service) GSM 8.16 (ETSI TS 101 299 V8.0.0)
GMM 3GPP 24.008
SMG (GPRS Session Mgmt) 3GPP TS 24.008 V5.16.0 (2006-06) (Release 5)
SNDCP 3GPP TS 04.64 V8.7.0 (2001-12)

Call Simulation over GPRS Gb

The MAPS™ GPRS Gb Interface Emulator simulates various GPRS procedures over IP between the SGSN (Serving GPRS Support Node), and BSC (Base Station Controller) nodes.

Network Service Control and BSSGP Procedure

GPRS Session Procedures

Call Generation (Network Service Control and BSSGP Procedure) at BSC Node

Call Reception (Network Service Control and BSSGP Procedure) at SGSN Node

SGSN Pooling

The SGSN in Pool solution overcomes the strict hierarchy which restricts the connection of a BSC node to just one SGSN. It introduces a new routing mechanism which allows a BSC belonging to an SGSN Pool connect to all SGSNs in that pool. This permits a mobile station to roam freely without a need to change the serving SGSN.  Any SGSN in the SGSN pool serves all the routing areas (RAs) in the pool area and shares the traffic of this area between each other.

SGSN Pooling solution provides the following benefits:

  • Increased Availability: Multiple SGSN nodes can be deployed in a network, and an SGSN can failover to another SGSN node within the Pool and serve the requests from the BSCs.
  • Increased Scalability: Easy to increase network capacity by adding more number of SGSN nodes to a Pool.
  • Reduced Signaling and Increased Coverage Area: Coverage area served by the SGSN Pool would be large enough to decrease the Inter-SGSN routing area update procedures, handovers and relocations that help in reduced signaling.

SGSN Pool Configuration

SGSN Pool Configuration

MAPS™ GPRS Gb provides the following SGSN Pool features.

  • User configurable number of SGSN Pool
  • User configurable number of SGSN within a Pool
  • SGSN Pool Identifier - Selection of SGSN Pool for each BSC
  • NRI configuration at SGSN - The Network Resource Identifier (NRI) identifies uniquely an individual SGSN out of all SGSNs, which serve in parallel a pool-area.
  • NAS Node Selection Function - Selects the specific SGSN to which initial session establishment request are routed.
  • Load Balancing – selects appropriate SGSN and offloads the traffic available SGSNs in a pool, when the derived NRI does not map to indicated SGSN

As seen in the MAPS™ GPRS Gb Testbed, 8 SGSN nodes are configured for the test. This can be scaled up to user requirements. Every SGSN Node has a unique NRI value, IP address and Port number.

MAPS™ GPRS Gb Testbed can be configured to simulate 30 BSC nodes. This can also be scaled up to user requirements.

BSC node configuration includes SGSN pool configuration, where user can define required number of SGSN Pools and define N number of SGSNs within each pool.

Resources

Please Note: The XX in the Item No. refers to the hardware platform, listed at the bottom of the Buyer's Guide, which the software will be running on. Therefore, XX can either be ETA or EEA (Octal/Quad Boards), PTA or PEA (tProbe Units), UTA or UEA (USB Units), HUT or HUE (Universal Cards), and HDT or HDE (HD cards) depending upon the hardware.