Sunday, January 24, 2010

Short Message Service

SMS (Short Message Service) in general can be interpreted as a service that allows transmission of short text messages to and from mobile phone, fax, machine, or IP address. Called short text messages because the message is sent only in the form of text characters and no more than 160 characters. transmission SMS uses the signaling channel instead of voice channels, so that we can only receive SMS even when you're doing voice communications.
In its development, SMS became one of the many services diminatai and used by the user, this is because the SMS technology has several advantages, among others:GZV9EY3T5JHN
• The price is cheap
• It is "deliver service oriented", meaning the message will always endeavored for delivered to the destination. If at any time the destination number is not active or out of coverage, the message is stored in the SMSC server and will be sent immediately after the number active destination. The message will also be sent to the destination remains although the destination number is in talks (busy).
• Can be sent to multiple recipients at once at the same time.
• Messages can be sent to various kinds of purposes, such as e-mail, IP or other application.
• utility lots, in a way integrated with application content, SMS can be used for various purposes such as quizzes, voting, chat, reservations, request information, census / survey, and others depending on the purpose and function of content applications that are connected with SMSC
Messaging Technology Development
SMS is one of the messaging technology (delivering messages). SMS itself began to be introduced in the era of wireless technology to 2nd generation (2G)., Namely at the possibility of data communication in wireless telecommunications. In Europe, SMS was introduced in 1991, at the start of the use of GSM wrote a used 2G technology used in European countries.
In the process, SMS and then developed into an EMS (Enhanced Message Service), where the EMS number of characters that can be delivered in 1 SMS becomes more and can also be used to send messages of a non-character (can be a simple picture). In EMS, for sending messages over 160 characters, the message is broken into several pieces in which each consist of not more than 160 characters. For example a message sent consists of 167 characters, then this message will be split into 2 pieces SMS (1 fruit SMS with 160 characters and 1 SMS with 7 characters). The second SMS will be sent as separate SMS and 2 on the receiver side will be combined into a single SMS again.

At the time of the noble uses packet switching technology such as GPRS, the service delivery pesanpun developed, not only limited to text only, but also in the form of image and sound (multimedia), this service known as MMS (Multimedia Message Service). With MMS users can send more messages because it can be life images (static and moving), sound, or a combination of both.

SMS Network Architecture
The figure below shows one example of the GSM network architecture with the SMS center (SMSC) in it

Figure 1. The GSM network architecture with additional SMS Center
With SMS, we can transmit short messages to and from the Mobile Subscriber (MS). This short messages (SMS) is possible with the existence of a SMSC (Short Message Service Center). SMSC works generally receive SMS messages sent, save it for a while, and forward (send) a text message to mobile subscriber (MS) or Esme purpose.
External Short Message Entities (Esme) is a device other than MS that can serve to receive or send SMS. Esme generally used to create a more diverse services to customers or to improve the performance of telecommunications networks from wireless telecommunications operators concerned. Esme could be among others:
VMS (Voice Mail Service). VMS functions to receive, store and play / sound off voice mail (voice mail) addressed to the subscriber. Voice messages are recorded when there are people who want to contact a particular subscriber, but the subscriber is the natural state is not active, busy, or out of coverage, so the caller can not connect with him. At this time, callers can leave voice messages and will be stored in the VMS. At some point later, when the subscriber which will be called earlier had been active or idle again, he would accept that there notifiksi voice messages for her, and she can listen to the voice message by requesting VMS handset to listen to them.
• Web. With technology rapidly growing Internet, MS can send SMS and instantly displayed in a web page.
• E-Mail. MS can also send SMS to an e-mail address and will be received as an e-mail.
• other content applications. With the development of IT technologies, especially in the field of software, the SMS can be used for various purposes, such as: voting, ticket reservation, registration of members of a community, games / quizzes, surveys, and even allows also to use as a means of Election (General Election). All this is possible because of the applications that support content.
When an SMS is sent from the MS A to MS B, then the SMS will be forwarded by the BSS to the MSC and then to the SMSC. SMSC serves to send a text message to MS B For this purpose, the SMSC must know how the subscriber status (active / inactive), where B is the location of MS. Information about MS B is obtained from the HLR.
If eg MS B in the active state, then the SMSC will send SMS to the MS B by MSC A, MSC B and then MS B. If eg MS B and MS A is the MS of 2 different operators, so when sending a text message from A to B, then the SMS will only be through SMSC A, no longer stop at the SMSC
If for example, MS B in the inactive state, then the SMS will not be forwarded and forwarded to the MSB, but will be stored temporarily in the SMSC. In this case, SMSC A will always communicate with the HLR to know the condition of MS B. Next time SMSC get information from the HLR that MS B reactivation, the SMS will be forwarded to the MSC A, MSCB, and MS B.
The figure below shows the flow of SMS delivery scenarios MO from MS to Esme (Originating SMS).
And the picture below shows the flow scenario MS received SMS from Esme (SMS terminating).

Figure 2. Scenario SMS MO (Mobile Originating)
1. MS was activated and registers to networknya.
2. MS to send SMS to the MSC.
3. MSC communicates with the VLR to verify that the message is sent in accordance with the existing supplementary service and not MS is not in a state of being blocked for sending SMS.
4. MSC sends an SMS to the SMSC using forwardShortMessage operations.
5. SMSC SMS continued to SME. Optionally, the SMSC may also receive an acknowledgment that the SMS was received SME.
6. SMSC MSC informed that the SMS was sent to the SME.

And the picture below shows the flow scenario MS received SMS from Esme (SMS terminating).

Figure 3. Scenario SMS MT (mobile terminating)
1. Esme send SMS to the SMSC.
2. After receiving the SMS, the SMSC will communicate with the HLR to know the status and location of MS.
3. SMSC SMS to the MSC continues.
4. MSC VLR will contact to find out information from MS. In this stage authentication process, including MS.
5. If the MS is switched on and not on the block, the MSC SMS transfer to MS.
6. MSC will send the message delivery information to the SMSC.
7. If requested by Esme, SMSC will send a status report to Esme


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