Why there is a need of separate mac protocols for wireless networks?
Answers
The MAC sublayer, which belongs to the data link layer, takes care of the
control of access to the medium, is responsible for transmitting the packets. Validate the
to check transmission errors and confirm the receipt of the transmitted data.
plots to the emitter, are their main functions. In addition, it is in charge of functions such as
packet fragmentation, flow control, transmission rate, power control and
functions related to battery management. In short, to control a medium
of communication shared by a series of machines that communicate through it.
The characteristics of the physical environment are the basis for facing the design of
a MAC protocol. In the case of wireless networks there are a number of
limitations that the physical environment imposes. The radio-electric space used in the
wireless communication, allows reduced bandwidths, due to the fact that the medium
is not free, it is regulated by the Telecommunications Law 11/98 ¡Error! I don't know
finds the origin of the reference, where a free access band is collected for
use of scientific, industrial and medical character, consequence of the standards
the EEC in the field of communications. The ISM band
(Industrial, Scientist and Medical) allows free use of the 2.4-2.5 GHz frequency.
In addition as a consequence of the noise present in the environment, characteristic in all the
wireless communications, hinders the development of communications with a high degree of
bandwidth. The objectives when designing a link protocol are to
aimed at solving these limitations.