Selective calling system and selective calling receiver

A transmitting method for transmitting data from a transmitter to a plurality of receivers, the method comprising the steps of:

• (a) dividing a predetermined time period into a plurality of frames,
• in each of the frames
• (b) generating a synchronization signal;
• (c) sequentially generating a plurality of address signals associated with the receivers, respectively;
• (d) storing an address transmission count which is incremented at each address signal;
• (e) sequentially generating a plurality of message signals corresponding to the address signals, respectively, each of the message signals comprising a message and a message header which includes the address transmission count of an address signal corresponding to the message signal, said address transmission count indicating a transmission order of each of the addresses within said address field;
• and
• (f) transmitting the frames to the receivers.

A receiver comprising:

• receiving means for receiving a frame of at least a first signal, said frame comprising a synchronization field, an address field comprising a plurality of addresses associated with the receivers, respectively, and a message field comprising a plurality of messages corresponding to the addresses, respectively, each of the messages comprising a message and a message header which includes an address transmission number of an address corresponding to the message, said address transmission number indicating a transmission order of each of the addresses within said address field;
• searching means for sequentially searching the address field for an address of the receiver itself while incrementing an address count at each address searched;
• storage means for storing the address count when the address of the receiver itself is found;
• and
• message selecting means for selecting a message addressed to the receiver itself from the message field by comparing the address count stored with the address transmission number included in the message header.

A selective calling receiver comprising:

• receiving means for intermittently receiving a first signal comprising a plurality of frames, each of the frames comprising an address field of addresses and a message field of messages, the respective addresses being associated with the messages, each of the messages including an address transmission number, said address transmission number indicating a transmission order of each of the addresses within said address field;
• searching means for sequentially searching the address field for an address of the selective calling receiver itself while incrementing an address count at each address searched;
• storage means for storing the address count when the address of the selective calling receiver itself is found;
• and
• message selecting means for selecting a message addressed to the selective calling receiver itself from the message field by comparing the address count stored with the address transmission number.

A receiving method for receiving a first signal comprising a plurality of frames, each of the frames comprising an address field of addresses and a message field of messages, the addresses being associated with the messages, respectively, and each of the messages including an address transmission number, said adress transmission number indicating a transmission order of each of the addresses within said address field, the receiving method comprising the steps of:

• (a) sequentially searching the address field for a specific address indicating a relevant receiver while incrementing an address count at each address searched;
• (b) storing the address count when the specific address is found;
• and
• (c) selecting a specific message addressed to the relevant receiver from the message field by comparing the address count stored with the address transmission number.