There are about more than three billion users of this technology. The main goal was to provide a uniform international standard for wireless mobile communications. At the same time the first digital cellular system was formed which was based on GSM recommendations and later known as GSM The mobile station is generally the mobile phone which consists of a transceiver, display and a processor. Each handheld or portable mobile station consists of a unique identity stored in a module known as SIM Subscriber Identity Chip.
It is a small microchip which is inserted in the mobile phone and contains the database regarding the mobile station. It connects the mobile station with the network subsystem via the air interface. It consists of the below given elements:. Base Transceiver Station : One or more Base Transceiver Station provides physical connection of a mobile station to the network in form of air interface.
Depending on load, subscriber behavior and morph structure, it can have different configurations — Standard configuration Each BTS is assigned a different cell identity CI and several BTS forms a location area. Umbrella Cell configuration One BTS with high transmission power installed at a higher altitude, acting as an umbrella to the lower transmission power Base Transmitter Stations , Collocated configurations several BTSs collocated at one site, but antennas cover only area of or degrees.
It is a network of neighboring radio cells which provide a complete coverage of the service area. Base Station Controller : It controls operation of one more Base Transceiver Stations, basically the handover or power control. It consists of a database comprising the whole maintenance status of the BTS, quality of radio and terrestrial resources and BTS operations software. It compresses or decompresses speech from the mobile station.
However, it is not used for data connections. Network Switching Subsystem : It provides the complete set of control and database functions needed to set up a call using encryption, authentication and roaming features. Some of the limitations are described below:. Some mobile phone models example: Ericsson R cannot be used with a computer to receive concatenated SMS messages. What is a concatenated SMS message?
A concatenated SMS message is a message that contains more than bytes. A normal SMS message can only contain at most bytes. Concatenated SMS works like this: the sender's mobile device breaks a message longer than bytes into smaller parts. Each of these parts are then fitted in a single SMS message and sent to the recipient. When these SMS messages reach the destination, the recipient's mobile device will combine them back to one message.
What is the cause of the problem? When the mobile phone receives the SMS messages that are parts of a concatenated SMS message, it combines them to one message automatically. The correct behavior should be: when the mobile phone receives the SMS messages that are parts of a concatenated SMS message, it forwards them to the computer without combining them.
Many mobile phone models cannot be used with a computer to receive MMS messages. Because when they receive a MMS notification, they handle it automatically instead of forwarding it to the computer.
A mobile phone may not support some AT commands, command parameters and parameter values. For example, some mobile phones do not support the sending and receiving of SMS messages in text mode.
Most SMS messaging applications have to be available 24 hours a day. If such SMS messaging applications use mobile phones to send and receive SMS messages, the mobile phones have to be switched on all the time. It should also be noted that not all phones support the modem interface for sending and receiving SMS messages. In particular, most smart phones, including Blackberries, iPhone, and Windows Mobile devices, do not support this GSM modem interface for sending and receiving SMS messages at all at all.
Additionally, Nokia phones that use the S60 Series 60 interface, which is Symbian based, only support sending SMS messages via the modem interface, and do not support receiving SMS via the modem interface. NowSMS Lite is available as a free day trial. Why NowSMS?
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