Short Message Service (SMS) is the technology that enables user to deliver and receive text messages via cell phones. It supports alphanumeric message as much as 160 characters, by packing the 7-bit ASCII characters into 8-bit octets. Message can be typed straight using cellular phones or via some other interfaces such as computers.
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2 . SMS Service Types
There are two basic types of SMS:
o Point-to-point communication
Point-to-point communication service is the support that supports messages between 2 subscribers of the SMS services. This is the service type that is used by regular individual subscribers.
o SMS cell broadcast service (SMSCB)
SMS cellular broadcast service is the type of support whereby the same message is broadcast to multiple SMS subscribers. Such service is only available to the network operators, and is normally used for communications like weather alerts and information reports.
3. SMS Network Architecture
SMS network architecture is based on the architecture of Global System regarding Mobile Communications (GSM).
SMS is really a store and forward data providers. This means that messages are not sent to the destination directly. Instead, messages are routed and stored in SMS Message Centre (SMSMC), and then forwarded to the destination.
An SMSMC provides an amount of services, including the regulation and transfer of text messages between mobile phones. If a subscriber sends a text message to some recipient, the mobile phone actually sends the message to the SMSMC. The particular SMSMC stores the message then delivers it to the designated receiver when they are available. The SMSMC usually has a configurable validity period that determine how long it will store the information, and the user can usually specify a shorter validity period if they want.
In addition to regulation of messages, the SMSMC also handles any kind of charging that needs to take place. In general, there is at least one SMSMC per network.
This article aims to provide an introductory guide to the Short Information Service (SMS) which is part of the GSM specification. The limit in size associated with SMS is 160 characters in case purely Latin alphabets are used. If non Latin alphabets such as Chinese language characters are used, the limit is going to be 70 characters.