Polling method and vehicle search method in digital radio communication system

Abstract

The present invention provides a polling method in a radio digital communication system making it possible to shorten time required for polling without causing increase in an error rate and to efficiently manage and administrate communications. In a digital radio communication system for collecting information from a plurality of terminal stations by polling, a polling response signal to be transmitted from each terminal station to a base station has a frame format constructed of a one-frame in which a cyclic bit pattern is placed at a leading end of the frame format.

1 . A polling method in a digital radio communication system for collecting information from a plurality of terminal stations by polling, wherein a polling response signal to be transmitted from each terminal station to a base station has a frame format constructed of a one-frame in which a cyclic bit pattern is placed at a leading end of the frame format.  
   
   
       2 . The polling method in a digital radio communication system according to  claim 1 , wherein a modulating system for signal transfer is the π/4 shift QPSK system, and all bits in the cyclic bit pattern are “0”.  
   
   
       3 . The polling method in a digital radio communication system according to  claim 1 , wherein the modulating system for signal transfer is the π/4 shift QPSK system, and each of all bits in the cyclic bit pattern are a repetitive bit pattern comprising binary values of “1”and “0”.  
   
   
       4 . A vehicle search method in a digital radio communication system for collecting information from a plurality of terminal stations into a base station by polling, wherein a polling response signal to be transmitted from each terminal station to the base station has a frame format constructed of a one-frame in which a cyclic bit pattern is placed at a leading end of the frame format, and the base station collects information from the terminal stations based on the polling response signal constructed of the one-frame in response to a request for allocation of a vehicle from a client.