METHOD AND SYSTEM FOR PROVIDING ACKNOWLEDGEMENT IN A 2-WAY MESSAGING SYSTEM

摘要

A message transmission system comprising at least one primary station (10, 14, 16, 22) having means for making transmissions on a down-link and a plurality of secondary stations (18, 20) having means for making transmissions on an up-link, each of the secondary stations having its own address which is transmitted as part of the down-link message. Each of the secondary stations has means (100, 102, 104-Fig. 8 not shown) for generating responses to messages as pseudo-random data sequences, the pseudo-random data sequence being generated by a secondary station at any one time being dependent on at least the address assigned to the secondary station and/or information contained in the message.