Trillium | GPRS Mobility Management & Session Management (GMM / SM)
Description
GPRS Mobility Management and Session Management (GMM / SM) protocol supports the mobility of user terminal so that the SGSN can know the location of a mobile station (MS) at any time and to activate, modify and deactivate the PDP sessions required by the MS for the user data transfer.
Trillium GMM / SM protocol software is an integrated offering of standards-based GMM and SM protocols that operates on the SGSN.
GMM / SM transports the signaling messages over the control plane between the SGSN and MS. GMM provides services to transfer the messages of Session Management (SM), Short Message Service (SMS), Resource Manager (RM) and Supplementary Services (SS). For this GMM uses the services of LLC and BSSGP layers over the Gb interface and of RANAP over the Iu interface.
GMM / SM provides the following basic capabilities:
- Provides support for GMM procedures attach, detach, routing area update, paging, common procedures like authentication, PTMSI allocation and identity and SRNS relocation.
- Provides support for SM procedures to activate, modify and deactivate the PDP context.
- Implements the basic protocol state machines for the GMM as well as SM procedure events.
- Performs distribution of Layer 3 messages on the user SAPs which includes services to support SMS and SS messages.
- Implements the support for NM as per the BSSGP – NM interface for GPRS.
Trillium GMM / SM software enables telecom equipment manufacturers of soft switches, signaling gateways, signal transfer points, service control points, media gateway controllers or other products to:
- Accelerate time to market
- Reduce development costs
- Reduce project risk of internally developed GMM / SM applications
Product deliverables consist of C source software, documentation, training, a warranty and technical support.
Product Information
The GMM-SM software is a portable C source code with modular design and simple interfaces which can be easily ported into any environment under any operating system.
Extensive debugging capabilities are provided including debug printing and function traces. This is useful in embedded systems in which other symbolic debugging is unavailable. Extensive error checking and recovery mechanisms are available to deal with normal error conditions, which can be enabled using compile time options.
Features + Benefits
- Can operate in GSM mode (over Gb interface) as well as UMTS mode (over Iu interface) simultaneously; provides support for Intersystem handovers between GSM and UMTS.
- GMM supports an interface with SMS and non call related Supplementary Services (SS).
- SM protocol supports the Secondary PDP Contexts from Release 99 onwards.
- Handles GGSN restart in the SM procedures.
- The release 98 version of SM supports the Anonymous PDP contexts.
- Provides support for the Location based services (LCS).
- Supports the CS paging for MSC for Gs interface.
- On the Iu interface, provides support for all the RANAP procedures including SRNS relocation, security mode, reset, reset resource,RAB allocation and Iu signaling connection management.
- Provides support for Iu flex architecture for PS domain in the Release 5 and onwards.
- Supports operation of a single SGSN with multiple MSs; also one instance provides services to multiple upper and lower layer entities.
- Supports option of distribution of uplink traffic to multiple instances of user applications; supports distribution of downlink traffic to multiple instances of LLC and BSSGP on Gb interface and multiple instances of RANAP on Iu interface.
- Recovers from detected errors and notifies unrecoverable errors.
- Integrated Iu and Gb stacks with GMM / SM also available with sample application, stubs and layer manager.
- Conforms to Trillium Advanced Portability Architecture (TAPA)
- Benefits of licensing Trillium software from Continuous Computing
Product Interworking
Trillium GMM / SM software interworks with Trillium LLC and Trillium BSSGP software to support Gb Interface in GPRS and with Trillium RANAP software to support the Iu Interface in UMTS.
Professional Services
Continuous Computing also offers Professional Services to integrate Trillium software into customers' products.
Conformance
Trillium GMM / SM software conforms to the following standards:
- 3GPP TS 04.08 Release 98, Mobile Radio Interface Layer 3 Specification; Core Network Protocols Stage-3
- 3GPP TS 24.008 Release 99, Mobile Radio Interface Layer 3 Specification; Core Network Protocols Stage-3
- 3GPP TS 24.008 Release 4, Mobile Radio Interface Layer 3 Specification; Core Network Protocols Stage-3
- 3GPP TS 24.008 Release 5, Mobile Radio Interface Layer 3 Specification; Core Network Protocols Stage-3
- 3GPP TS 24.008 Release 6, Mobile Radio Interface Layer 3 Specification; Core Network Protocols Stage-3
- GSM 08.18 Release 98, BSSGP Specification ( for the SGSN Network Management specifications)
Trillium GMM / SM assumes the support of following standards for the underlying layers:
- 3GPP TS 25.413 R99, R4 and R5 for RANAP
- GSM 04.64 R98 and R99 for LLC
- GSM 08.18 R98 for BSSGP
Refer to GMM / SM Functional Specifications for the detailed implementation information.
