GSN-Lite

GSN-Lite software framework from Aricent is a compact, high-performance GPRS support node (GSN) that can be deployed in 3G or 2.5G (GPRS/Edge) networks as SGSN, GGSN or both. GSN-Lite is a standardized software framework that allows service providers to offer high-speed Internet services to GPRS subscribers. As a software framework that can run on any Linux-based PC, GSN-lite is cost-effective and highly scalable. It is suitable for all GPRS operators and MVNEs who need to offer high-speed wireless data services at competitive prices.

GSN-Lite can be deployed quickly and easily, and without any undue increase in operator’s capital expenditures. In addition, GSN-Lite's maintenance costs are low and thus the use of this node does not increase operational expenditures. GSN-Lite is ideal for a variety of deployment scenarios.

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GSN-Lite

GSN-Lite software framework from Aricent is a compact, high-performance GPRS support node (GSN) that can be deployed in 3G or 2.5G (GPRS/Edge) networks as SGSN, GGSN or both. GSN-Lite is a standardized software framework that allows service providers to offer high-speed Internet services to GPRS subscribers. As a software framework that can run on any Linux-based PC, GSN-lite is cost-effective and highly scalable. It is suitable for all GPRS operators and MVNEs who need to offer high-speed wireless data services at competitive prices.

GSN-Lite can be deployed quickly and easily, and without any undue increase in operator’s capital expenditures. In addition, GSN-Lite's maintenance costs are low and thus the use of this node does not increase operational expenditures. GSN-Lite is ideal for a variety of deployment scenarios.

Features:

GSN-Lite offers valuable features that add flexibility and performance in the following deployment scenarios:

GSN-Lite as SGSN

When deployed as SGSN, GSN-Lite handles inbound and outbound packet data traffic that is addressed from/to mobile stations of users in a geographical area. In addition, it also handles interactions with the GSM circuit-switched and short messaging infrastructures. As an SGSN, Aricent's GSN-Lite provides the following functionalities:

  • Mobility Management - SGSN supports all mobility management functions including Attach, Detach, Inter, and Intra SGSN Routing Area Update (RAU) and Paging.
  • SGSN supports HLR addressing, based on an E.214 Mobile Global Title, derived by the SGSN from the IMSI for inter-PLMN signaling (or on the SPC if intra-PLMN Signaling).
  • Session Management - SGSN provides session management functions, including establishment of Packet Data Protocol (PDP) contexts for routing purposes, with the GGSN used by the GPRS subscriber.
    • At PDP context activation, the SGSN negotiates the Quality of Service (QoS) with the Mobile Station (MS) when the QoS level requested by the MS cannot be supported. The QoS is re-negotiated when the QoS negotiated by the mobile from the previous SGSN cannot be supported at inter-SGSN RAU.
    • The SGSN supports reliability classes 2, 3, 4, and 5, and accepts all delay classes. However, there is no special processing done by the SGSN in terms of enforcing relative importance or absolute time values.
    • The SGSN supports the Admission Control function at each PDP context activation request. The Admission Control function results either in negotiation of the QoS with the mobile or in rejection of the PDP Context Activation request. A request is rejected when the number of simultaneously attached or activated subscribers increases beyond a specified value.
    • The SGSN supports Service Precedence classes by discarding packets based on the Precedence Class negotiated by MSs.
    • As a part of session management, the SGSN assists in mean and peak throughputs and policing. While it ensures that the mean and peak throughputs given to an MS never exceeds the negotiated value, there is no guarantee that the mean or peak throughput rates can be achieved or sustained for any period.
  • SMS - The SGSN supports mobile-originated and mobile-terminated short messaging through GPRS radio channels.
  • Charging Functions - The SGSN supports Call Detail Record (CDR) generation. M-CDRs, S-CDRs, SMS-MO-CDRs, and SMS-MT-CDRs generated by the SGSN are sent to the Charging Gateway over the GA interface using the GTP protocol.
  • Authentication and Identity Check - The SGSN supports mobile authentication and identity check procedures during 'Attach' and inter-SGSN routing area updates.
  • Security - The SGSN supports encrypted communication to and from mobiles using GEA1 and GEA2 ciphering algorithms. The GSN-Lite software framework includes implementation of GEA1 and GEA2 ciphering algorithms.
  • Compression - The SGSN supports TCP header compression using Van Jacobson and V.42bis data compression techniques to conserve radio bandwidth while sending data to and from a mobile station.
  • Routing - The SGSN routes the packets received from a mobile to an appropriate GGSN, based on the APN requested by the mobile. The SGSN supports interrogation of the DNS to translate the APN into the IP address of the GGSN.

GSN-Lite as GGSN

As a GGSN, Aricent's GSN-Lite provides the following functionalities:

  • Subscriber Session/Data Management - The GGSN assigns an IP address to a mobile station. The GGSN supports PDP context activation for PDP type IPv4.
    • The GGSN supports dynamic IP addressing for subscribers, and thus enables the operator to use and reuse IP addresses from a pool of IP addresses allocated to the PLMN/Network by using local pools configured at the GGSN. Alternatively, the GGSN may use DHCP for IP address allocation from a configured DHCP server on a per-APN basis.
    • The GGSN supports static IP address allocation so that subscribers are always provided the same IP address defined at the time of subscription in the HLR. Otherwise, the RADIUS protocol could be configured to allocate the same IP address to a specific subscriber.
    • A maximum of five PDP contexts are supported for one MS. There is one distinct IP address per PDP context. Negotiated QoS classes for the PDP contexts of an MS can be different.
  • Charging Function - The charging function in the GGSN sends G-CDRs to the Charging Gateway. G-CDRs output from the GGSN are ASN.1/BER encoded. In case of a CGF/link failure, the CDRs are buffered in non-volatile memory (hard-disk) and are transferred to the CGF on CGF/link recovery.
  • Routing - The GGSN routes the packets received from the SGSN to a default gateway, statically configured at the GGSN, and routes the packets received from an external PDN for a mobile to an appropriate SGSN serving the mobiles.
  • RADIUS Accounting - GSN-Lite, when used as a GGSN, can be configured to send accounting information to RADIUS servers configured according to APN configuration rules. This facilitates the user to configure the network for applying accounting principles using the RADIUS mechanism.

Combined GSN functionality

As a combined entity, GSN-Lite supports the functionality of both SGSN and GGSN. The combined GSN can support Inter-SGSN procedures while acting as a GGSN in the Public Land Mobile Network (PLMN) in which it is deployed. It will continue to act as a GGSN for the subscribers who were in roaming mode in another PLMN. In addition, GSN-Lite can be configured to notify occurrence of any significant event or alarm to configured e-mail addresses, simplifying remote system monitoring.

Benefits

  • Multi-scenario deployment
  • Optimized capex
  • Platform independent
  • Flexible licensing model
  • Easy interoperability with 3rd party network components
  • Easy manageability with GUI based EMS
  • Mature offerings for 2.5G & 3G GSN-Lite version licensed to 40+ OEMs across globe with more than 1000+ commercial deployments
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