Signaling service processing platform

Protocol Interfaces

Data Access Interface
Diameter Interfaces
STP Protocol Interfaces
SIP Interfaces and Protocols

Data Access Interface

The SPS comprises two parts, the front end (FE) and back end (BE). The FE represents the signaling plane, and the BE represents the data plane. Figure 1 describes the data access interface the BE provides for the FE.
Figure 1 Data access interface

Interface Type	Interface	Description
Data access interface	DS call interface (DCI)	The DCI is a Huawei proprietary interface used for the FE to access data in the BE.

Diameter Interfaces
The SPS provides the Diameter signaling transfer, roaming border gateway, and signaling service processing functions in the Long Term Evolution (LTE), Policy and Charging Control (PCC), and IP multimedia subsystem (IMS) networks.
Figure 1 shows the Diameter interfaces the SPS provides in the LTE, PCC, and IMS networks.
Figure 1 Diameter interfaces

AS: application server	AAA: authentication, authorization, and accounting
BSF: bearer service function	EIR: equipment identity register
DRA: Diameter routing agent	GGSN: gateway GPRS support node
IMS-HSS: IP multimedia subsystem home subscriber server	MME: mobility management entity
OCS: online charging system	OFCS: offline charging system
GMLC: gateway mobile location center	PCRF: policy and charging rules function
P-GW: PDN gateway	SAE-HSS: system architecture evolution home subscriber server
SPS: signaling service processing system	CSCF: call session control function
SCEF: Service Capability Exposure Function	SGSN: Serving GPRS Support Node

The SPS can provide Diameter-based flexible routing services as follows:

• 
  Diameter message replication: The service enables the SPS to make a copy of messages that meet specified criteria and send the copy to a dedicated service platform through the standard Diameter interface. The original message routing is not affected during this process.
  
• 
  Address resolution: The SPS routes Diameter messages to peers based on subscriber identities (including IMSI, NAI, MSISDN, IMPI, and IMPU).
  
• 
  Session binding: During an IP-connectivity access network (IP-CAN) session with the same subscriber, the SPS forwards the messages received over different interfaces (for example, the Gx, S9, and Rx interfaces) to the same PCRF or deliver the messages of the same session to the same destination device (for example, the PCRF or OCS).
  

Table 1 describes the Diameter interfaces supported by the SPS.

Table 1 Description of Diameter interfaces