# US 5,710,975 A · Selective call transceiver with system approved power saving state

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- Number: US 5,710,975 A
- Document ID: US5710975A
- Status: Granted
- Kind: A
- Application number: 08/578,755
- Filed: 1995-12-26
- Granted: 1998-01-20
- Earliest claimed: 1995-12-26
- Assignees: Motorola, Inc.
- Inventors: Richard C. Bernhardt; Clinton C. Powell, II
- Web page: https://patentgrep.com/patent/US5710975A

## CPC

- H04W 84/025: {with acknowledge back capability}
- H04W 88/022: {Selective call receivers}
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A battery-powered selective call transceiver, operating in two-way communication with an RF communication system, can be put in a power saving state. A user control on the transceiver allows a user to select the duration of a power saving interval. The transceiver sends to the communication system a signal requesting that the transceiver enter a power saving state for the selected interval. Upon receipt of an acknowledgment signal from the system, the transceiver enters the power saving state.

## Claims

### Claim 1

For use with an asynchronous communication system that exchanges information with a selective call transceiver by transmissions that occur at random intervals, a method of establishing a power saving state within the selective call transceiver without losing information comprising:
a) establishing a communication link between the selective call transceiver and the communication system;
b) sending from the selective call transceiver to the communication system a signal requesting that the selective call transceiver, be permitted to enter a power saving state for a predetermined, uninterrupted power saving interval;
c) if the communication system approves the request, sending an acknowledgment signal from the communication system to the selective call transceiver;
d) if the acknowledgement signal indicating request aaproval is received by the selective call receiver, causing the selective call transceiver to enter the power saving state; and
e) during the power saving interval, storing messages intended for the selective call transceiver.

### Claim 2 (depends on 1)

A method as set forth in claim 1 wherein the power saving state lasts for an interval whose maximum duration is controlled by the communication system.

### Claim 3 (depends on 1)

A method as set forth in claim 1 including selecting a duration for the power saving interval at the selective call transceiver.

### Claim 4 (depends on 3)

A method as set forth in claim 3, further including transmitting from the communication system to the selective call transceiver a signal indicating a maximum duration for the power saving interval.

### Claim 5

In a selective call transceiver that is capable of two-way RF communication with an asynchronous communication system by transmissions that occur at random intervals, a method of establishing a power saving state in the selective call transceiver, comprising:
a) sending to the communication system a signal requesting that the selective call transceiver be permitted to enter a power saving state for a predetermined, uniterrupted power saving interval;
b) receiving an acknowledgement signal from the communication system approving the request to enter a power saving state; and
c) entering the power saving state if the acknowledgement signal is received.

### Claim 6 (depends on 5)

A method as set forth in claim 5 wherein the power saving interval is variable.

### Claim 7 (depends on 6)

A method as set forth in claim 6, including using the selective call transceiver to select a duration for the power saving interval.

### Claim 8 (depends on 5)

A method as set forth in claim 5 further including detecting the end of the power saving interval and sending a signal to the communication system indicating that the selective call transceiver's power saving state has ended.

### Claim 9 (depends on 8)

A method as set forth in claim 8 including manually re-setting the selective call transceiver from the power saving state to an active state.

### Claim 10

In a selective call transceiver that is capable of two-way RF communication with an asynchronous communication system by transmissions that occur at random intervals, a method of establishing a power saving state in the selective call transceiver, comprising:
a) sending to the communication system a signal requesting that the selective call transceiver be permitted to enter a power saving state for a user-selected, uninterrupted power saving interval;
b) receiving an acknowledgment signal from the communication system approving the request to enter a power saving state;
c) entering the power saving state if the acknowledgement signal is received;
d) detecting the end of the power saving interval; and
e) sending a signal to the communication system indicating that the selective call transceiver's power saving state has ended.

### Claim 11 (depends on 10)

A method as set forth in claim 10 including manually re-setting the selective call transceiver from the power saving state to an active state.

### Claim 12

A battery-powered selective call transceiver capable of two-way RF communication with an asynchronous communication system by transmissions that occur at random intervals, comprising:
a receiver for receiving incoming signals;
a transmitter for sending outgoing signals at random intervals;
a memory for storing an indication of a duration for a power saving state; and
a processor coupled to the memory and programmed to cause the transmitter to send to the communication system a signal indicating that the selective call transceiver be permitted to enter the power saving state for a predetermined, uninterrupted power saving interval, and to cause the selective call reveiver to enter the power saving state in response to the selective call receiver receiving a signal from the communication system indicating request approval.

### Claim 13 (depends on 12)

A battery-powered selective call transceiver as set forth in claim 12 further including a user control for selecting a duration for the power saving interval, the processor being responsive to the user control for causing an indication of the selected duration to be stored in the memory.