How is the SMS sent from the smartphone transmitted in the way?

ByDAVID HOLT

SMS, which sends and receives messages from smartphones and mobile phones to a telephone number, has decreased the number of users due to the appearance of messenger applications such as LINE and WhatsApp, but once it has sent 6.1 trillion SMS messages in a year It was used in. What is the structure of SMS different from messenger application and e-mail, movies that briefly explained using animation are "Where Do Your Texts Go?"is.

Where Do Your Texts Go? - YouTube


It took about 12 days to send a letter from New York to London in the 1800's about 200 years ago where mobile phones do not exist. In 1858, cable for telegraph that passed through the Atlantic Ocean "Atlantic transverse telecommunication cable"Was laid between the United Kingdom and the United States and a congratulation was sent to James Buchanan, the 15th president of the United States from Queen Victoria, Queen of the 6th Hanover Morning. However, it seems that it took about 17 hours to deliver a message from the UK to America.



In the 1930 's, household phones became popular in general households, and in the 1980' s, mobile phones were invented. It took about 10 hours to charge the mobile phone, which was first commercialized in the world, and the talk time was only about 35 minutes. In addition, the price was 4000 dollars (about 900,000 yen at the time at that time), which was so expensive as to be impossible in modern times.


The first SMS in the world was transmitted in 1992, and it seems that the number of cellular phones in the world is higher than the number of toilets as of 2016. In modern times about 23 billion SMS messages are sent every day, but few people understand the mechanism of SMS.


Transmission and reception of SMS is done via invisible radio waves. For example, when listening to a radio, electromagnetic waves have longer wavelengths than light, and radio waves passing through objects are not used because they can not be seen by human eyes.


The radio waves similar to the radio are used for SMS transmission and reception. Mobile phones receive signals of specific frequencies, and at the same time send their own radio waves to the network. In this case the network refers to a system consisting of three towers, an antenna, and a transmitter. This network divides the geographical area into subdivisions, but this subdivision is called "cell" in English and it is the origin of the name of a mobile phone (chell phone). In the small section that the network divided, it is decided which radio tower is responsible for the transmission of radio waves, but since the area covered by one radio tower overlaps with the other radio tower, the radio wave of the mobile phone It is less likely that you will be out of range.


However, in the countryside and remote areas away from the radio tower the radio conditions will be bad. In addition, the communication situation deteriorates in vehicles such as cars and trains that operate at high speed such that the radio tower that transmits radio waves changes like a corner.


When SMS is transmitted from the mobile phone, the transmitted radio wave is received by the nearby radio tower and converted into an electronic impulse. The converted electronic impulse is transmitted to a network base station called Mobile Switching Center (MSC), and the MSC identifies the radio tower responsible for the area where the mobile phone receiving the SMS belongs and transmits the electronic impulse. Then, the radio tower converts the electronic impulse into a radio signal, which is received by the mobile phone antenna and displays SMS. What is surprising is that this series of transmission / reception is done in seconds.


The number of transmissions of SMS peaked in 2011, and thereafter it is decreasing. The reason for the decrease is the emergence of messenger applications such as LINE and WhatsApp, and WhatsApp says it is actually sending 30 billion messages in the world.


Messages sent by the messenger application are sent via submarine cables around the world unlike SMS.


Technologies for cellular phone and smartphone networks are being developed from the 4 th generation communication method (4 G) to the 5 th generation communication method (5 G), which increases the communication speed to about 100 times, and in 2023 Embedding mobile phones in the body, there is a possibility that technology can be realized that can send messages just by thinking with your head.