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Positioning
To address service demands for signaling networks, Huawei unveils the signaling service processing system (SPS) that integrates the SIP signaling router (SSR), Diameter routing agent (DRA), and signaling transfer point (STP) functionality defined by 3GPP. The SPS implements signaling message convergence and forwarding and provides intra-network message convergence and inter-network border gateway functions as well as special signaling forwarding services. The mappings between the types of NE functioned by the SPS and the types of signaling message are as follows:
SSR: SIP signaling
DRA: Diameter signaling
STP: SS7 signaling
Huawei SPS provides the following functions:
STP
Signaling service processing platform
SIP routing agent
DRA
STP
The SPS can serve as an STP and provide the following functions:
Forwards signaling, translates global titles (GTs), and implements signaling charging for SS7 signaling.
Connects to network nodes with high-availability, which simplifies network structure and enables centralized management.
Makes signaling network upgrade easier because of its large capacity and smooth capacity expansion.
Serves as the STP for the next generation network (NGN).
Signaling service processing platform
The SPS can serve as a signaling service processing platform and implement the following services:
Number Portability (NP)
Flexible Number Routing (FNR)
Signaling Firewall Gateway (SFG)
IMEI Check
SIP routing agent
The SPS implements TCP/UDP/SCTP link convergence, SIP/SIP-I/SIP-T interworking, and centralized route management in the following types of network to simplify the SIP network structure and improve the O&M efficiency:
Public switched telephone network (PSTN)
Public land mobile network
Long Term Evolution (LTE)
Policy and Charging Control (PCC)
IP multimedia subsystem (IMS)
DRA
The SPS can serve as the Diameter signaling forwarding platform, roaming border gateway, and signaling service processing platform in the Long Term Evolution (LTE), Policy and Charging Control (PCC), and IP multimedia subsystem (IMS) networks. The multi-PCRF routing and session binding functions of the PCC architecture are special requirements for the Diameter signaling network. Along with the development of voice over LTE (VoLTE) services, these requirements will become the strong development momentum for the Diameter signaling network.
Figure 1 shows the networking for Huawei SPS signaling solution in the LTE, PCC, and IMS networks.
Figure 1 Networking for Huawei SPS signaling solution
AF: application function
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AS: application server
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CSCF: call session control function
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DEA: Diameter edge agent
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DRA: Diameter routing agent
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HSS: home subscriber server
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IPX: IP Packet eXchange
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ISTP: international signaling transfer point
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LE/LS: local exchange/local switch
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LSMS: local service management system
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IMS-HSS: IP multimedia subsystem home subscriber server
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HLR: home location register
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MSC: mobile switching center
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MME: mobility management entity
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NP: number portability
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NPAC: number portability administration center
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NGN: next generation network
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OCS: online charging system
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OFCS: offline charging system
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PCRF: policy and charging rules function
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PCEF: policy and charging enforcement function
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SPS: signaling service processing system
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STP: signaling transfer point
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SMSC: short message service center
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SGSN: serving GPRS support node
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SANEX: signaling analysis system
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SSR: SIP signaling router
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Sensitive subscriber data, for example, IMSI, may be collected if the SPS is used to provide the data backup, message tracing, operation log management, and network information collection functions. You must be obligated to take proper measures, in compliance with the laws of the local country and the user privacy policies of your company, to ensure that personal user data is securely protected.
Logical Structure
This section describes the structure of the internal communication system. Figure 1 shows the overall system structure.
Figure 1 Logical structure
The whole system is connected by four buses: IPMB, BASE, FABRIC and SCSI.
IPMB: It is the equipment management and monitoring bus of the entire system, and connects all modules and boards.
BASE: It is used by the management and control plane of the system and provides a channel for software loading, alarm reporting, and maintenance message delivery.
FABRIC: It provides data channels for the service plane of the system and bears service-related information of the system.
SCSI: It provides physical channels for storing data.
The hardware of the system contains the following subsystems:
Processor subsystem: This subsystem is comprised of the processor board, and interface board. It is the service processing center of the system.
Switching subsystem: This subsystem implements the data exchange function. It adopts the dual-star structure to provide system control and data exchange and interconnection of service planes.
Electromechanical subsystem: This subsystem is comprised of the power entry module (PEM), fan and backplane. The power entry module provides redundant power supplies and filters power supplies. The fan control module monitors and adjusts the temperature of devices. Complying with PICMG 3.0 specifications, the system backplane provides power input channels for boards in subracks and signaling interworking.
Equipment management subsystem: This subsystem is comprised of the SMM board and related interface boards. It monitors platform hardware status and implements device management, O&M management, fault management, and statistics management.
In the whole system, the switching subsystem acts as the pivot and the processor subsystem acts as the core. The two subsystems, together with the electromechanical subsystem and equipment management subsystem, form a powerful service processing platform.
Board
Board Type
Board Deployment
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