Radiotelephone message processing for low power operation

• US 5,175,874 A
• Filed: 04/10/1991
• Issued: 12/29/1992
• Est. Priority Date: 04/10/1991
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Auchter, Thomas J.
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Charouel, Lisa
• Application Number:
  US07/682,996
• Time in Patent Office: 629 Days
• Field of Search: 455/38.1, 455/38.2, 455/38.3, 455/89, 455/32, 455/343, 340/825.44, 340/825.47, 340/825.48, 340/311.1, 379/61, 379/63, 370/94.1, 370/100.1
• US Class Current: 455/574
• CPC Class Codes: H04B 1/1615 Switching on; Switching off, e.g. remotely battery saving circuits associated with selective call operation H04W52/00; details of power consumption reduction in a PLL, H03L7/0802, H03L7/14, H03L2207/08, H03L2207/18; muting amplifiers by gain control see H03G3/34
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The process of the present invention first synchronizes to incoming messages from the base station. The first data word is received and stored in the radiotelephone. The error code in the data word is next checked to determine if errors exist in the word. If there are errors, the word is corrected. This process is repeated on another data word and the second received word is compared with the first. If the words are not equal, the receiver remains on until at least two words are equal or the entire length of the message is received. If the words are equal, the word is processed by the radiotelephone and the receiver is turned off for the remaining portion of the message until the next synchronization word is to be received.

Claims

1. A method for operating a radiotelephone at reduced power, the radiotelephone having a receiver, memory, synchronizable hardware, and processor for processing one of a plurality of messages received from a base station, each message being comprised of a plurality of synchronization words, at least one data word, and at least one repeated data word, each data word including an error code, the method comprising the steps of:

synchronizing the synchronizable hardware to a first synchronization word;

synchronizing the radiotelephone to a first message of the plurality of messages in response to a second synchronization word;

receiving the at least one data word;

storing the at least one data word;

modifying the at least one data word in response to the error code;

if the repeated data word has not been received, repeating from step b, thereby forming a plurality of received data words;

comparing at least two words of the plurality of received data words to each other;

if the at least two words are not the same, receiving any remaining of the repeated data words in the first message; and

if the at least two words are the same, shutting off the receiver for a predetermined time.

2. The method of claim 1 wherein the predetermined time is for the remainder of the repeated data words in the first message.

3. A method for operating a radiotelephone at reduced power, the radiotelephone having a receiver, memory, synchronizable hardware, and processor for processing a plurality of messages received from a base station, each message being comprised of a plurality of synchronization words, and a first and second data word, each data word including an error code and being repeated a plurality of times in the message, the radiotelephone processing only the first or the second data word, the method comprising the steps of:

synchronizing the synchronizable hardware to a first synchronization word;

synchronizing the radiotelephone to a first message of the plurality of messages in response to a second synchronization word;

receiving the second data word;

storing the second data word;

modifying the second data word in response to the error code;

if a repeated second data word has not been received, repeating from the step of receiving the second data word, thereby forming a plurality of received second data words;

comparing the plurality of received second data words to each other;

if at least two of the received second data words are not the same, receiving any remaining of the repeated second data words in the first message; and

if the at least two received second data words are the same, shutting off the receiver for a predetermined time.

4. The method of claim 3 wherein the predetermined time is for the remainder of the repeated second data words in the first message.

5. A method for operating a radiotelephone at reduced power, the radiotelephone having a receiver, synchronizable hardware, and processor for processing a plurality of messages received from a base station, each message being comprised of a plurality of synchronization words, and a first and a second data word, each data word including an error code and being repeated a plurality of times in the message, the radiotelephone processing only the first or the second data word, the method comprising the steps of:

synchronizing the synchronizable hardware to a first synchronization word;

synchronizing the radiotelephone to a first message of the plurality of messages in response to a second synchronization word;

receiving the first data word;

storing the first data word;

modifying the first data word in response to the error code;

if a repeated first data word has not been received, repeating from the step of receiving the first data word, thereby forming a plurality of received first data words;

comparing the plurality of received first data words to each other;

if at least two of the received first data words are not the same, receiving any remaining of the repeated first words in the first message; and

if the at least two received first data words are the same, shutting off the receiver for a predetermined time.

6. The method of claim 5 wherein the predetermined time is for the remainder of the repeated first data words in the first message.

7. A radiotelephone for communicating with a base station and having synchronizable hardware, the base station transmitting a plurality of messages, each message being comprised of a plurality of synchronization words, at least one data word, and at least one repeated data word, each data word including an error code, the radiotelephone comprising:

receiving means for receiving the plurality of messages;

transmission means for transmitting signals;

memory means for storing the at least one data word; and

processing means for controlling the radiotelephone, the processing means performing a method of operating the radiotelephone at reduced power, the method comprising the steps of;

synchronizating the synchronizable hardware to a first synchronization word;

synchronizing the radiotelephone to a first message of the plurality of messages in response to a second synchronization word;

receiving a first data word;

storing the first data word;

modifying the first data word in response to the error code;

if the repeated first data word has not been received, repeating from the step of receiving a first data word;

comparing at least two of the first data words to each other;

if the at least two first data words are not the same, receiving any remaining of the repeated first data words in the first message; and

if the at least two first data words are the same, shutting off the receiver for a predetermined time.

8. A method for operating a radiotelephone at reduced power, the radiotelephone having a receiver, synchronizable hardware, and processor for processing a plurality of messages received from a base station, each message being comprised of a plurality of synchronization words, at least two data words, and at least one repeated data word, each data word including an error code, the method comprising the steps of:

synchronizing the synchronizable hardware to a first synchronization word;

synchronizing the radiotelephone to a first message of the plurality of messages in response to a second synchronization word;

receiving at least two data words;

modifying each data word in response to the error code in each data word;

comparing the at least two data words to each other;

if the at least two data words are not the same, receiving any remaining of the repeated data words in the first message; and

if the at least two data words are the same, turning off the receiver for a predetermined time.

9. A method for operating a radiotelephone at reduced power, the radiotelephone having a receiver, synchronizable hardware, and processor for processing a plurality of messages received from a base station, each message being comprised of a plurality of synchronization words, at least two data words, and at least one repeated data word, each data word including an error code, the method comprising the steps of:

synchronizing the synchronizable hardware to a first synchronization word;

synchronizing the radiotelephone to a first message of the plurality of messages in response to a second synchronization word;

receiving at least two data words;

modifying each data word in response to the error code in each data word;

comparing the at least two data words to each other;

if the at least two data words are not the same, receiving any remaining of the repeated data words in the first message; and

if the at least two data words are the same, turning off the receiver until the first synchronization word in a second message of the plurality of messages is received.