This paper considers the MAC layer in General Packet Radio Service (GPRS) system. We present the MAC procedures used to enable multiple mobile stations to share a common transmission medium that may contains many radio physical channels. This layer makes use of slotted ALOHA protocol combined with a specific retransmission mechanism in order to establish the physical connection. The access pers...

The authors have been developing the mobile robots which can cooperation between robots. The robots should communicate with each other in order to cooperate together. Therefore, the inter communication between robots is very important problem to be solved. These robots generally utilize wireless transmission system. The transmission sets send and receive on the same frequency or channel to esta...

Wireless technologies (mobile communications or other radiofrequency transmission methods) represent reliable and efficient solutions for remote data acquisition, supervisory and control systems. The correct selection of the proper transmission method from the wide variety of radio transmission methods and standards represents an important issue. For this reason in the firs part of this paper a...