Hardware PCH checking for personal handyphone system portable station

A circuit arrangement for checking paging information transmitted in a personal handyphone system to a portable station having a unique identification number, and for activating a processor to initiate a communication link to the portable station, the paging information including the identification number of the called station and an identification number of a cell station from which the paging information is transmitted, the circuit arrangement comprising:

• a first memory portion for storing the identification number of the portable station;
• a second memory portion for storing an identification number of a cell station from which the portable station receives calls;
• an interrupt generator coupled to the first memory portion and the processor, the interrupt generator comparing an identification number of a called station received with paging information with the identification number of the portable station stored in the first memory portion, comparing the stored cell station identification number with the transmitted cell station identification number, and generating an interrupt in response to both the identification number of the portable station matching the identification number of the called station and the stored cell station identification number matching the transmitted cell station identification number, the processor being adapted to initiate a communication link to the portable station in response to the interrupt.

A circuit arrangement for checking paging information transmitted in a personal handyphone system to a portable station having a unique identification number, and for activating a processor from a lower power mode to initiate a link to the portable station, the paging information including an identification number of a called station and an identification number of a cell station from which the paging information is transmitted, the circuit arrangement comprising:

• a first memory portion for storing the identification number of the portable station;
• a logic device coupled to the first memory portion and having an operational mode that consumes less power than the processor when the processor is in an operational mode other than the low power mode, the logic device comparing an identification number of the portable station stored in the first memory portion with the identification number of a called station received with paging information, the logic device providing an output signal having a first state indicating that the identification number of the called station matches the identification number of the portable station;
• and
• a control device for generating an interrupt when the output from the control device is in the first state, the processor adapted for activating from the low power mode and initiating a communication link to the portable station is in response to the interrupt.

A circuit arrangement for checking paging information transmitted in a personal handyphone system to a portable station having a unique identification number, and for activating a processor to initiate a link to the portable station, the paging information including an identification number of a called station and an identification number of a cell station from which the paging information is transmitted, the circuit arrangement comprising:

• a first memory portion for storing the identification number of the portable station;
• a second memory portion for storing an identification number of a cell station from which the portable station receives calls;
• a logic device coupled to the first memory portion, the logic device comparing an identification number of the portable station stored in the first memory portion with the identification number of a called station received with paging information and comparing the stored cell station identification number with the transmitted cell station identification number, the logic device indicating a first state corresponding to the identification number of the called station matching the identification number of the portable station;
• and
• a control device being adapted to generate an interrupt in response to the first state and the stored cell station identification number matching the transmitted cell station identification number, the processor being adapted to activate from a low power mode and initiate a communication link to the portable station in response to the interrupt.

A cellular telephone for operating in a personal handyphone system and having a unique identification number, the cellular telephone comprising:

• a receiver for receiving paging information, the paging information including an identification number of a called station and an identification number of a cell station from which the paging information is transmitted;
• a circuit arrangement coupled to the receiver and having a first memory portion for storing the identification number of the telephone, a second memory portion for storing an identification number of a cell station from which the telephone receives calls, and an interrupt generator coupled to the first memory portion and the second memory portion, the interrupt generator comparing the identification number of the called station with the identification number of the telephone, comparing the stored identification number of the cell station with the identification number of the cell station from the paging information, and generating an interrupt in response to the event in which both the identification number of the telephone matches the identification number of the called station and the stored identification number of the cell station matches the identification number of the cell station from the paging information;
• a processor coupled to the interrupt generator to receive the interrupt, the processor adapted for activating from a low power mode and initiating a communication link to the telephone in response to the interrupt;
• and
• a portable power supply coupled to supply power to the processor and to the interrupt generator.

A cellular telephone for operating in a personal handyphone system and having a unique identification number, the cellular telephone comprising:

• a receiver for receiving paging information, the paging information including an identification number of a called station and an identification number of a cell station from which the paging information is transmitted;
• a circuit arrangement coupled to the receiver and having a first memory portion for storing the identification number of the telephone, and an interrupt generator coupled to the first memory portion, the interrupt generator comparing the identification number of the called station with the identification number of the telephone and generating an interrupt when the identification number of the telephone matches the identification number of the called station and wherein the interrupt generator compares the stored cell station identification number with the transmitted cell station identification number and generates the interrupt when the stored cell station identification number matches the transmitted cell station identification number;
• a processor coupled to the interrupt generator to receive the interrupt, the processor adapted for activating from a low power mode and initiating a communication link to the telephone in response to the interrupt;
• and
• a portable power supply coupled to supply power to the processor and to the interrupt generator.

A method for checking paging information transmitted in personal handyphone system to a portable station having a unique identification number and further having a circuit arrangement for generating a control signal to pass to a processor, the paging information including an identification number of a called station and an identification number of a cell station from which the paging information is transmitted, the method comprising:

• storing the identification number of the portable station in a first memory portion;
• generating an interrupt at the circuit arrangement when the identification number of the portable station matches the identification number of the called station or when the stored cell station identification number matches the transmitted cell station identification number;
• passing the interrupt to the processor;
• establishing a communication link to the portable station, wherein the processor adapted to activate from a low power mode and establish the communication link in response to receiving the interrupt;
• and
• storing in the first memory portion an identification number of a cell station from which the portable station receives calls.