Wireless telephone ring detection method for extended battery life

• US 6,144,840 A
• Filed: 04/13/1998
• Issued: 11/07/2000
• Est. Priority Date: 04/13/1998
• Status: Expired due to Term

• Current Assignee: Microsemi Semiconductor (U.S.) Inc. (Microchip Technology Incorporated)
• Original Assignee: Advanced Micro Devices, Inc.
• Inventors: Hebeler, Steven E., Alton, Ken
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): APPIAH, CHARLES NANA
• Application Number:
  US09/059,115
• Time in Patent Office: 939 Days
• Field of Search: 455/462, 455/464, 455/465, 455/38.3, 455/343, 455/574
• US Class Current: 455/343.3
• CPC Class Codes: H04M 1/72505 Radio link set-up procedures
• CPC Class Codes: H04M 1/73 Battery saving arrangements
• CPC Class Codes: H04W 52/0232 according to average transmission signal activity
• CPC Class Codes: H04W 52/287 when the channel is in stand-by
• CPC Class Codes: H04W 52/288 taking into account the usage mode, e.g. hands-free, data transmission, telephone
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A cordless telephone apparatus and method of use thereof with a telephone system providing a ring cadence as a series of alternating ring and silence periods over a telephone line. The cordless telephone comprises a handset that is configured and arranged to operate in a low power mode during periods of inactivity on the telephone line and, in response to receiving a least one ring message, in a normal power mode in which the battery-powered handset acknowledges receipt of the ring message. The cordless telephone further comprises a base unit is configured and arranged to respond to a ring signal received over the telephone line by sending the ring message to the battery-powered handset through the end of each ring period, and for a portion of the subsequent silent period, until the handset reverts to the normal power mode and acknowledges receipt of the ring message. Accordingly, as soon as the handset acknowledges receipt of the ring message, the base unit can cease sending of the ring message if the ring period has ended. This method of operation for the cordless telephone provides extended battery life for a cordless telephone operation by permitting the handset to operate in a low-power, standby mode for greater periods of time through the use of a particular method of ring detection.

Claims

1. A cordless telephone apparatus for use with a telephone system providing a ring cadence as a series of alternating ring and silence periods, comprising:

a handset configured and arranged to operate in a low-power mode during periods of inactivity on a telephone line and, in response to receiving at least one ring message, in a normal-power mode in which the handset acknowledges receipt of said at least one ring message; and

a base unit having a handset/telephone-line interface circuit configured and arranged to respond to a detected ring period by sending a series of the ring messages to the handset until the later of the handset acknowledging receipt of the ring message, and the end of each ring period.

2. A cordless telephone apparatus, according to claim 1, wherein the handset/telephone line interface circuit is further configured and arranged to send the ring message to the handset as a series of data messages.

3. A cordless telephone apparatus, according to claim 1, wherein the base unit is firer configured and arranged to send the ring message to the handset as a continuous data message not necessarily interrupted by periods of silence.

4. A cordless telephone apparatus, according to claim 1, wherein the handset/telephone line interface circuit includes a processor circuit having a program, that when executed, causes the base unit to send the ring message as set forth in claim 1.

5. A cordless telephone apparatus, according to claim 1, wherein the handset is battery powered.

6. A method of operating a communicatively-coupled battery-powered handset and base unit with a telephone system providing a ring cadence as a series of alternating ring and silence periods over a telephone line, comprising:

operating the battery-powered handset in a low-power mode during periods of inactivity on the telephone line and, in response to receiving at least one ring message, in a normal-power mode in which the battery-powered handset acknowledges receipt of said at least one ring message; and

using the base unit to respond to a ring signal received over the telephone line by sending the ring message to the battery-powered handset until the earlier of the handset acknowledging receipt of the ring message or through the end of each ring period and for a portion of the subsequent silent period.

7. A cordless telephone apparatus for use with a telephone system providing a ring cadence as a series of alternating ring and silence periods over a telephone line, comprising:

a battery-powered handset including means for operating in a low-power mode during periods of inactivity on the telephone line and, in response to receiving at least one ring message, in a normal-power mode in which the battery-powered handset acknowledges receipt of said at least one ring message; and

a base unit including means for responding to a ring signal received over the telephone line by sending the ring message to the battery-powered handset until the later of the handset acknowledging receipt of the ring message, and the end of each ring.

8. A method extending the useful lifetime of a handheld, battery-operated telephone handset and base unit, in which the handset alternates its operation between one of two modes, wherein the modes include a low-power, standdown mode and a high-power active mode, the method comprising the steps of:

(a) the telephone base unit begins transmitting a series of ring messages to the handset upon assertion of a valid ring signal from a telephone central office;

(b) the handset switches from the standdown mode to the active mode after having been in the standdown mode for a first period of time;

(c) the handset listens for ring messages while operating in the active mode;

(d) the handset switches from the active mode to the standdown mode if the handset has not received any ring messages from the base unit within a second period of time;

(e) the handset transmits a response message to the base unit upon receipt of each ring message received from the base unit;

(f) the base unit stops transmitting the series of ring messages to the handset after the occurrence of the following;

(1) receipt of at least one response message after beginning the transmission of the series of ring messages; and

(2) deactivation of the ring signal by the central telephone office; and

(g) repeat steps (a)-(f).

9. A method extending the usefull lifetime of a handheld, battery-operated telephone handset and base unit, in which the handset alternates its operation between one of two modes, wherein the modes include a low-power, standdown mode and a high-power active mode, the method comprising the steps of:

(a) the telephone base unit begins transmitting a series of ring messages to the handset upon assertion of a valid ring signal from a telephone central office;

(b) the handset switches from the standdown mode to the active mode after having been in the standdown mode for a two (2) second period of time;

(c) the handset listens for ring messages while operating in the active mode;

(d) the handset switches from the active mode to the standdown mode if the handset has not received any ring messages from the base unit within a first period of time;

(e) the handset transmits a response message to the base unit upon receipt of each ring message received from the base unit;

(f) the base unit stops transmitting the series of ring messages to the handset after the occurrence of the following;

(1) receipt of at least one response message after beginning the transmission of the series of ring messages; and

(2) deactivation of the ring signal by the central telephone office for a four (4) second silence period after being asserted for a two (2) second period of time; and

(g) repeat steps (a)-(f).

10. A cordless telephone apparatus, comprising:

a base unit, comprising;

means for receiving a two (2) second ring signal from a central telephone office followed by a four (4) second silent period, wherein the six (6) second cycle of ring signal followed by the silent period repeats;

means for receiving messages transmitted from a battery-powered handset; and

;

means for transmitting a series of ring messages to the handset while the ring signal is present, unless a response message has not been received from the handset in response to one or more ring messages, wherein the ring messages continue to be transmitted to the handset until either one or more response messages are received by the base unit, or no response message is received by the base unit within a first period of time from the end of the ring signal; and

the battery-powered handset, comprising;

means for switching the operation of the handset from a low-power, shutdown mode to a high-power, active mode after being in the shutdown mode for a two (2) second period of time;

means for receiving the ring messages transmitted by the base unit while operating in the active mode;

means for transmitting the response message back to the base unit upon receipt of each ring message while operating in the active mode; and

means for switching the operation of the handset from the active mode to the shutdown mode if no ring messages have been received from the base unit after listening for messages in the active mode for a second period of time.