Sunday, September 21, 2008
SMS - Message Sending Process (Technical Realization)
The following describes the method of SMS Sending:
1. Message originate from mobile phone and similar device (known as MS)
2. The SMSC receive the message from MS and forward it to GSMC.
3. The SMS GMSC requests the routing information by sending the message MAP_SEND_ROUTINGINFO_FOR_SM to HLR (not shown). The message include the MSISDN (mobile Number) of the recipient MS.
4. The HRL retrieve the routing information and pass it to SMS GMSC. The information includes the IMSI and serving MSC address of recipient MS.
5. The GMSC delivers the message to MSC by sending the message MAP_FORWARD_SHORT_MESSAGE.
6. The MSC extract user information by query VLR.
7. MSC finally deliver the message using paging operation.
Short Message Service
SMS appeared on the wireless scene in 1991 in Europe, where digital wireless technology first took hold. The European standard for digital wireless, now known as the global standard for mobiles (GSM), included short messaging services from the outset.
The point-to-point SMS provides a mechanism for transmitting "short" messages to and from wireless handsets. The service makes use of a short message service center (SMSC) which acts as a store and forward system for short messages. The wireless network provides for the transport of short messages between the SMSCs and wireless handsets.
A distinguishing characteristic of the service is that an active mobile handset is able to receive or submit a short message at any time, independent of whether or not a voice or data call is in progress. SMS also guarantees delivery of the short message by the network. Temporary failures are identified, and the short message is stored in the network until the destination becomes available.
The Sinful Apple! - Part 2
Last time I wrote how operator are planning to sell a $200 iphone at $800 in India.
I have interesting update. According to business-week, everyone including Airtel, Hutch (operators) and Apple itself has denied any involvement in pricing iphone so ridiculously in India. Operators are blaming apple and apple in turn is blaming operators.
I guess May be not today, but someday in future there would be another debate - "Failure of apple Iphone in India". It is not difficult to see who will take blame for this.