The past decade has seen more innovation in the area of mobile communications
 than in any other  area of  telecommunications.  Our  quality of  life  has  already
 changed as a result and there is undoubtedly a good deal further to travel.

 It  is  no  surprise  then  to  find  that  the  references  to  the  various   mobile
 communications systems  are  themselves  very  confusing.  The  object  of  this
 introductory section is to attempt to make sense of some of this confusion.

 A short description of each of the main services is provided here and a more
 extended treatment is included in the sections which follow.

 Paging Systems  permit the user, who carries a pocket receiver, to be alerted
 to the fact that he/she is wanted. In most cases it is necessary for the user to
 contact a central point in order to find out what is wanted.

 Private Mobile Radio provides two-way voice and, possibly, data
 communication  between the user and a central point, or between users belonging
 to the same closed user group.
 
 Cellular Systems provide continuous communication between mobile users
 and any other telecommunications terminal connected to the worldwide public
 network whether mobile or fixed. They are named after the technology of
 providing small transmitter / receivers serving cells so that the scarce resource
 of radio frequencies can be re-used in non-adjacent cells. The moving mobile
 is handed on to the cell best placed to continue the communication.

 Cordless Systems  started with the desire to have the telephone with you in
 the garden or the bath. The cordless' phone communicates with the base station
 which can  be  in  the  home  or,  with  the  use  of  Personal   Communications
 Networks (PCN), with a base station in a public  place.

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