Describes the basic concepts of the SMSC.
SM
The
short message (SM) is the non-real-time and reliable data packet
transmitted on the PLMN (Public Land Mobile Network) network through a
signaling channel. The short message service (SMS) provides
peer-to-peer, non-real-time and reliable data transmission by storing
and forwarding messages.
SME
The
short message entity (SME) is the sender or recipient of SMs, including
mobile subscribers, automatic systems and manual systems. The SP can
also be called external short message entity (ESME).
MO
The
mobile originated (MO) SM refers to the SM which is originated from the
mobile station (MS). The MO process refers to the process of the MS
sending an SM to the SMSC and then receiving the acknowledgement from
the SMSC.
MT
The
mobile terminated (MT) SM refers to the SM which is terminated at the
MS. The MT process refers to the process of the SMSC sending an SM to
the MS according to a certain rule and then receiving the
acknowledgement from the MS.
Account
All connections between ESME and SMSC use the same account. The account stores such data as interface
authority, authentication attribute and basic flow control information.
Interface
An
interface is an object of recording the connection between the ESME and
the SMSC. The ESME logs in to the SMSC with the
account and the SMSC creates an interface to manage this connection. The
attributes of an interface include local IP address, opposite IP
address, protocol parameter, flow control parameter, and so on.
Route Table
The
route table is the mapping table which stores the relationship between
the original address, destination address, SM protocol type and account.
The SMSC (Short Message Service Center) delivers an SM to the
designated account according to the information set in the route table.
SP
The
service provider (SP) is the provider of the SMS. After contracting
with operators, the SP provides various SMSs such as on-demand and
customization for subscribers.
