COMMUNICATION SYSTEM HAVING A PACKET STRUCTURE FIELD

摘要

A communication system develops an information packet having a packet structure field and at least one message. The message has an address and information associated with the address. A central station accumulates and incorporates the at least one message into the information packet. The central station determines the occurrence of the at least one address and generates identifying data indicating where the address occurs within the information packet. The identifying data is incorporated into the packet structure field and the information packet is transmitted. The information packet is received by at least one selective call receiver capable of operating in a high power mode in order to receive the information packet and a low power mode when receiving is not being performed. The selective call receiver extracts the packet structure field and interprets the identifying data. The identifying data is used to operate the selective call receiver in the high power mode only during the occurrence of the at least one address. The selective call receiver operates in the low power mode for the remainder of the information packet unless the information associated with the address is intended to be received by the selective call receiver.