WO1992019049A1 - Radiotelephone message processing for low power operation - Google Patents

Radiotelephone message processing for low power operation Download PDF

Info

Publication number
WO1992019049A1
WO1992019049A1 PCT/US1992/001983 US9201983W WO9219049A1 WO 1992019049 A1 WO1992019049 A1 WO 1992019049A1 US 9201983 W US9201983 W US 9201983W WO 9219049 A1 WO9219049 A1 WO 9219049A1
Authority
WO
WIPO (PCT)
Prior art keywords
word
data
radiotelephone
message
received
Prior art date
Application number
PCT/US1992/001983
Other languages
French (fr)
Inventor
Thomas J. Auchter
Original Assignee
Motorola, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola, Inc. filed Critical Motorola, Inc.
Priority to BR9204768A priority Critical patent/BR9204768A/en
Priority to KR1019920703082A priority patent/KR960003839B1/en
Priority to GB9225117A priority patent/GB2262413B/en
Publication of WO1992019049A1 publication Critical patent/WO1992019049A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0245—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal according to signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1607—Supply circuits
    • H04B1/1615—Switching on; Switching off, e.g. remotely
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates generally to the field of communications and particularly to radiotelephone commu ⁇ nications.
  • Radiotelephones while in an idle or standby mode, must constantly monitor a continuous stream of data mes ⁇ sages that are sent by the base station.
  • One of these data mes- sage streams is on the forward control channel.
  • the format of these messages is shown in FIG. 1 and is explained in more detail in Electronic Industries Association (EIA) 553 cellular system specification at section 3.7.
  • EIA Electronic Industries Association
  • the radiotelephone uses the dotting word (101), the first word of the message, to synchronize the radiotelephone hard ⁇ ware to the clock of the data message.
  • the synchronization word (102) indicates the present location in the data stream to the radiotelephone and that the data sequence is about to start.
  • Repeat words A and B are each forty bit words, the content and format of which are defined in EIA 553, and each is repeated five times in the message as illustrated.
  • the radiotelephone receives both of these words but only processes one of them. Which one the radiotelephone processes is de ⁇ termined by the least significant digit of the radiotelephone's telephone number. If the telephone number is even, word A is processed; otherwise word B is processed.
  • the radiotelephone's receiver In order to receive and process these words, the radiotelephone's receiver must be on and drawing power the entire time, thereby reducing the time a portable, battery-powered radiotelephone can be used for communication. There is a resulting need for a way to re ⁇ cute the time that the radiotelephone's receiver remains on during the idle mode, thus reducing power consumption, while still receiving the necessary information from the base station.
  • the process of the present invention initially synchro- nizes the radiotelephone to incoming messages from the base stations forward control channel.
  • the first repeat data word either A or B, 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 cor- rected. 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 words have been corrupted by noise or other interference and, therefore, the receiver remains on for the re ⁇ mainder of the message. 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 syn ⁇ chronization word is to be received.
  • FIG. 1 illustrates the message format of the data stream received from the base station.
  • FIGS. 2A and 2B illustrate flowcharts of the process of the present invention.
  • FIG. 3 illustrates a block diagram of a portion of a ra ⁇ diotelephone in accordance with the present invention. Detailed Description of the Preferred Embodiment
  • the process of the present invention reduces the time the radiotelephone's receiver is on, and therefore drawing power, while in the idle state. This is accomplished by shut ⁇ ting off the receiver, for the remainder of the message, after the receipt of an error free repeat word has been verified.
  • FIGS. 2A and 2B The process of the present invention is illustrated in FIGS. 2A and 2B.
  • an off-timer is checked for a zero condition (201). This timer determines the length of time the receiver is to be turned off. If the off-timer is not zero, the re ⁇ DCver should remain off and the routine is exited. Once the off-timer reaches zero, the receiver is turned on (202) and the data reception routine (200) is performed to receive the data messages from the base station.
  • the radiotelephone a block diagram of the relevant portions of which is illustrated in FIG. 3, then receives the data messages sent by the base sta ⁇ tion. Once the message reaches the dotting word (101), the ra ⁇ diotelephone starts the synchronizing process.
  • the dotting word (101) enables the radiotelephone hardware to synchro ⁇ nize with the data message clock.
  • the radiotelephone next re ⁇ ceives the synchronization word (102) that indicates to the ra ⁇ diotelephone the start of the repeat word (103 and 104) se ⁇ quence.
  • the first received and processed repeat word either A
  • radiotele ⁇ phone (103) or B (104), depending on the radiotelephone's telephone number, is stored in the radiotelephone. Since the radiotele ⁇ phone only processes either an A or B repeat word, subsequent reference to repeat words (103 or 104), unless indicated other- wise, is to the specific repeat word processed by the radiotele ⁇ phone.
  • a repeat word counter is next incremented (204) to keep track of the number of repeat words received.
  • the error code in the word explained in more detail in EIA 553, is checked to determine if errors are present in the word (205). If there are errors, caused by noise or other interference while in the transmission process, an attempt is made to remove the er ⁇ rors. This error correction process is described in detail in the EIA 553 specification. If the errors are repaired (205), the cor ⁇ rected repeat word is stored (206) for later comparison. If the errors could not be corrected, the process checks the word counter to determine if all five repeat words have been re ⁇ ceived (211). If all of the repeat words have not be received, the process repeats from the beginning in order to retrieve at least five. When the word counter reaches five, it is reset to zero (212) to get ready for the start of a new message. A majority vote of the received repeat words is next performed (213).
  • the majority vote compares the five received repeat words. If there are at least three that are the same, this word is assumed to be the word to be processed by the radiotele ⁇ phone. If the error code indicates a requirement that the re ⁇ peat word be error corrected, an error correction attempt is made (214). If the correction is not successful, the radiotele- phone ignores the word and returns to the beginning of the process to wait for another data message. If the error correc ⁇ tion is successful, the word is processed (216) by the radiotele ⁇ phone. The process performed depends on the information contained in the word, as illustrated in EIA 553. After the error corrected repeat word is stored (206), it is compared with any other repeat words that have been stored (207).
  • the process goes back to the beginning to wait for another word. If the predetermined number of stored words match, this number being two in the preferred embodiment, this word is assumed to be the correct repeat word and is processed by the radiotele ⁇ phone (208). As before, the process performed depends on the information contained in the word. Once the radiotelephone is finished processing (208), the off-timer is set (209) for the length of time remaining until the next synchronization word is expected. Since the radiotele ⁇ phone is synchronized with the data message, the radiotele- phone knows how long it will be until the next synchroniza ⁇ tion word is to be received. The receiver can then be turned off (210), reducing the power consumption of the radiotelephone, until the next synchronization word is due. The data recep ⁇ tion routine (200) then returns to the power control routine and the timer is checked for a zero condition (201). Once the timer reaches zero, the receiver is turned on (202), and the data reception process (200) of the present invention begins again.
  • FIG. 3 shows a block diagram of a typical radiotelephone.
  • the microprocessor (301) which runs the process of the present invention, receives the repeat words from the receiver (302) and, in response to the above described process of the present invention, controls the power to the receiver (302).
  • a process for operating a radiotelephone at reduced power has been shown. This process enables the radiotelephone to turn off the receiver for periods of time, thereby conserving the battery power.

Abstract

The process of the present invention first synchronizes to incoming messages from the base station. The first data word is received and stored (203) in the radiotelephone. The error code in the data word is next checked to determine if errors exist in the word (205). 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 (213). If the words are equal, the word is processed by the radiotelephone and the receiver is turned off (210) for the remaining portion of the message until the next synchronization word is to be received.

Description

- i -
RADIOTELEPHONE MESSAGE PROCESSING FOR LOW POWER OPERATION
Field of the Invention
The present invention relates generally to the field of communications and particularly to radiotelephone commu¬ nications.
Background of the Invention
Radiotelephones, while in an idle or standby mode, must constantly monitor a continuous stream of data mes¬ sages that are sent by the base station. One of these data mes- sage streams is on the forward control channel. The format of these messages is shown in FIG. 1 and is explained in more detail in Electronic Industries Association (EIA) 553 cellular system specification at section 3.7.
The radiotelephone uses the dotting word (101), the first word of the message, to synchronize the radiotelephone hard¬ ware to the clock of the data message. The synchronization word (102) indicates the present location in the data stream to the radiotelephone and that the data sequence is about to start. Repeat words A and B (103 and 104) are each forty bit words, the content and format of which are defined in EIA 553, and each is repeated five times in the message as illustrated. The radiotelephone receives both of these words but only processes one of them. Which one the radiotelephone processes is de¬ termined by the least significant digit of the radiotelephone's telephone number. If the telephone number is even, word A is processed; otherwise word B is processed. In order to receive and process these words, the radiotelephone's receiver must be on and drawing power the entire time, thereby reducing the time a portable, battery-powered radiotelephone can be used for communication. There is a resulting need for a way to re¬ duce the time that the radiotelephone's receiver remains on during the idle mode, thus reducing power consumption, while still receiving the necessary information from the base station.
fimrrniflry of thfi Invention
The process of the present invention initially synchro- nizes the radiotelephone to incoming messages from the base stations forward control channel. The first repeat data word, either A or B, 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 cor- rected. 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 words have been corrupted by noise or other interference and, therefore, the receiver remains on for the re¬ mainder of the message. 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 syn¬ chronization word is to be received.
Brief Description of the Drawings
FIG. 1 illustrates the message format of the data stream received from the base station.
FIGS. 2A and 2B illustrate flowcharts of the process of the present invention. FIG. 3 illustrates a block diagram of a portion of a ra¬ diotelephone in accordance with the present invention. Detailed Description of the Preferred Embodiment
The process of the present invention reduces the time the radiotelephone's receiver is on, and therefore drawing power, while in the idle state. This is accomplished by shut¬ ting off the receiver, for the remainder of the message, after the receipt of an error free repeat word has been verified.
The process of the present invention is illustrated in FIGS. 2A and 2B. Initially, an off-timer is checked for a zero condition (201). This timer determines the length of time the receiver is to be turned off. If the off-timer is not zero, the re¬ ceiver should remain off and the routine is exited. Once the off-timer reaches zero, the receiver is turned on (202) and the data reception routine (200) is performed to receive the data messages from the base station. The radiotelephone, a block diagram of the relevant portions of which is illustrated in FIG. 3, then receives the data messages sent by the base sta¬ tion. Once the message reaches the dotting word (101), the ra¬ diotelephone starts the synchronizing process. The dotting word (101) enables the radiotelephone hardware to synchro¬ nize with the data message clock. The radiotelephone next re¬ ceives the synchronization word (102) that indicates to the ra¬ diotelephone the start of the repeat word (103 and 104) se¬ quence. The first received and processed repeat word, either A
(103) or B (104), depending on the radiotelephone's telephone number, is stored in the radiotelephone. Since the radiotele¬ phone only processes either an A or B repeat word, subsequent reference to repeat words (103 or 104), unless indicated other- wise, is to the specific repeat word processed by the radiotele¬ phone.
A repeat word counter is next incremented (204) to keep track of the number of repeat words received. The error code in the word, explained in more detail in EIA 553, is checked to determine if errors are present in the word (205). If there are errors, caused by noise or other interference while in the transmission process, an attempt is made to remove the er¬ rors. This error correction process is described in detail in the EIA 553 specification. If the errors are repaired (205), the cor¬ rected repeat word is stored (206) for later comparison. If the errors could not be corrected, the process checks the word counter to determine if all five repeat words have been re¬ ceived (211). If all of the repeat words have not be received, the process repeats from the beginning in order to retrieve at least five. When the word counter reaches five, it is reset to zero (212) to get ready for the start of a new message. A majority vote of the received repeat words is next performed (213).
The majority vote (213) compares the five received repeat words. If there are at least three that are the same, this word is assumed to be the word to be processed by the radiotele¬ phone. If the error code indicates a requirement that the re¬ peat word be error corrected, an error correction attempt is made (214). If the correction is not successful, the radiotele- phone ignores the word and returns to the beginning of the process to wait for another data message. If the error correc¬ tion is successful, the word is processed (216) by the radiotele¬ phone. The process performed depends on the information contained in the word, as illustrated in EIA 553. After the error corrected repeat word is stored (206), it is compared with any other repeat words that have been stored (207). If no other repeat words have been stored, the process goes back to the beginning to wait for another word. If the predetermined number of stored words match, this number being two in the preferred embodiment, this word is assumed to be the correct repeat word and is processed by the radiotele¬ phone (208). As before, the process performed depends on the information contained in the word. Once the radiotelephone is finished processing (208), the off-timer is set (209) for the length of time remaining until the next synchronization word is expected. Since the radiotele¬ phone is synchronized with the data message, the radiotele- phone knows how long it will be until the next synchroniza¬ tion word is to be received. The receiver can then be turned off (210), reducing the power consumption of the radiotelephone, until the next synchronization word is due. The data recep¬ tion routine (200) then returns to the power control routine and the timer is checked for a zero condition (201). Once the timer reaches zero, the receiver is turned on (202), and the data reception process (200) of the present invention begins again.
FIG. 3 shows a block diagram of a typical radiotelephone. The microprocessor (301), which runs the process of the present invention, receives the repeat words from the receiver (302) and, in response to the above described process of the present invention, controls the power to the receiver (302). In summary, a process for operating a radiotelephone at reduced power has been shown. This process enables the radiotelephone to turn off the receiver for periods of time, thereby conserving the battery power.

Claims

Claims
1. A method for operating a radiotelephone at reduced power, the radiotelephone having a receiver, memory, and process- ing one of a plurality of messages received from a base station, each message being comprised of a synchronization word, at least one data word, and at least one repeated data word, each data word including an error code, the method characterized by the steps of: a) synchronizing the radiotelephone to a first message of the plurality of messages in response to the synchronization word; b) receiving the data word; c) storing the data word; d) modifying the data, word in response to the error code; e) if a repeated data word has not been received, repeat¬ ing from step b, thereby forming a plurality of received data words; f) comparing at least two data words of the plurality of data words to each other; g) if the at least two received data words are not the same, receiving any remaining data words in the first mes¬ sage; and the method further characterized by the step; h) if the at least two received data words are the same, shutting off the receiver for a predetermined time.
2. The method of claim 1 characterized in that 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, and process¬ ing a plurality of messages received from a base station, each message being comprised of a synchronization word, and a first and a second data word, each data word including an er¬ ror code and being repeated a plurality of times in the mes¬ sage, the radiotelephone processing only the first or the sec¬ ond data word, the method characterized by the steps of: a) synchronizing the radiotelephone to a first message of the plurality of messages in response to the synchronization word; b) receiving the second data word; c) storing the second data word; d) modifying the second data word in response to the er- ror code; e) if a repeated second data word has not been received, repeating from step b, thereby forming a plurality of received second data words; f) comparing the plurality of received second data words to each other; g) if at least two received second data words are not the same, receiving any remaining second data words in the first message; and the method further characterized by the step h) if at least two received second data words are the same, shutting off the receiver for a predetermined time.
4. The method of claim 3 characterized in that 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 and processing a plural¬ ity of messages received from a base station, each message be¬ ing comprised of a synchronization word, 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 ra¬ diotelephone processing only the first or the second data word, the method characterized by the steps of: a) synchronizing the radiotelephone to a first message of the plurality of messages in response to the synchronization word; b) receiving the first data word; c) storing the first data word; d) modifying the first data word in response to the error code; e) if a repeated first data word has not been received, re¬ peating from step b, thereby forming a plurality of received first data words; f) comparing the plurality of received first data words to each other; g) if at least two received first data words are not the same, receiving any remaining first data words in the first message; and the method further characterized by the step; h) if at least two received first data words are the same, shutting off the receiver for a predetermined time.
6. The method of claim 5 characterized in that 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, the base station transmitting a plurality of messages, each message being comprised of at least one synchronization word, at least one data word, and at least one repeated data word, each data word including an error code, the radiotele¬ phone 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 characterized by the steps of: a) synchronizing the radiotelephone to a first message of the plurality of messages in response to the at least one synchronization word; b) receiving a first data word; c) storing the first data word; d) modifying the first data word in response to the error code; e) if a repeated first data word has not been re¬ ceived, repeating from step b; f) comparing at least two first data words to each other; g) if the at least two received first data words are not the same, receiving any remaining first data words in the first message; and the method further characterized by; h) if the at least two received 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 and processing a plural¬ ity of messages received from a base station, each message be¬ ing comprised of at least one synchronization word, at least one data word, and at least one repeated data word, each data word including an error code, the method characterized by the steps of: a) synchronizing the radiotelephone to a first message of the plurality of messages in response to the at least one syn- chronization word; b) receiving at least two data words; c) modi ying each data word in response to the error code in each data word; d) comparing the at least two data words to each other; e) if the at least two data words are not the same, receiv¬ ing any remaining data words in the first message; and the method further characterized by the step of f) 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 and processing a plural¬ ity of messages received from a base station, each message be¬ ing comprised of at least one synchronization word, at least one data word, and at least one repeated data word, each data word including an error code, the method characterized by the steps of: a) synchronizing the radiotelephone to a first message of the plurality of messages in response to the at least one syn- chronization word; b) receiving at least two data words; c) modifying each data word in response to the error code in each data word; d) comparing the at least two data words to each other, e) if the at least two data words are not the same, receiv¬ ing any remaining data words in the first message; and the method further characterized by the step of; f) if the at least two data words are the same, turning off the receiver until the at least one synchronization word in a second message of the plurality of messages is received.
PCT/US1992/001983 1991-04-10 1992-03-13 Radiotelephone message processing for low power operation WO1992019049A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BR9204768A BR9204768A (en) 1991-04-10 1992-03-13 PROCESS TO OPERATE RADIOTELPHONE WITH REDUCED ENERGY, AND RADIO TELEPHONE FOR COMMUNICATION WITH BASE STATION
KR1019920703082A KR960003839B1 (en) 1991-04-10 1992-03-13 Radio telephone message processing for low power operation
GB9225117A GB2262413B (en) 1991-04-10 1992-03-13 Radiotelephone message processing for low power operation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US682,996 1991-04-10
US07/682,996 US5175874A (en) 1991-04-10 1991-04-10 Radiotelephone message processing for low power operation

Publications (1)

Publication Number Publication Date
WO1992019049A1 true WO1992019049A1 (en) 1992-10-29

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Country Status (9)

Country Link
US (1) US5175874A (en)
KR (1) KR960003839B1 (en)
AR (1) AR246143A1 (en)
CA (1) CA2078232C (en)
GB (1) GB2262413B (en)
HK (1) HK1000231A1 (en)
IT (1) IT1253991B (en)
MX (1) MX9201666A (en)
WO (1) WO1992019049A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0656693A2 (en) * 1993-12-03 1995-06-07 Nokia Mobile Phones Ltd. Method and apparatus for operating a radio telephone
WO1996026619A1 (en) * 1995-02-24 1996-08-29 Telefonaktiebolaget Lm Ericsson Method and apparatus for reducing the power consumption of a battery operated transceiver
US6119002A (en) * 1997-10-06 2000-09-12 Nokia Mobile Phones Limited Mobile station having methods and apparatus for performing neighbor channel measurements from analog control channel
CN1062398C (en) * 1993-07-16 2001-02-21 松下电器产业株式会社 Radio communication apparatus
US6240304B1 (en) 1998-02-11 2001-05-29 Nokia Mobile Phones Ltd. Mobile terminal having RF power consumption optimization of extended standby mode
CN1068480C (en) * 1993-07-16 2001-07-11 松下电器产业株式会社 radio communication system
KR101068744B1 (en) * 2010-03-10 2011-09-28 대성전기공업 주식회사 Integrity Check Method for Data Messages in the Data Communication Using the CAN Protocol

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0523722B1 (en) * 1991-07-19 1997-10-22 Fujitsu Limited Cordless telephone set
US5392287A (en) * 1992-03-05 1995-02-21 Qualcomm Incorporated Apparatus and method for reducing power consumption in a mobile communications receiver
CN1054243C (en) * 1993-01-28 2000-07-05 移动通信网株式会社 Wireless call system
WO1994019879A1 (en) * 1993-02-25 1994-09-01 Ntt Mobile Communications Network Inc. Method of selective radio paging, and receiver for radio paging
US5835023A (en) * 1993-02-25 1998-11-10 Ntt Mobile Communications Network Inc. Selective radio paging system and pager
US5396660A (en) * 1993-03-26 1995-03-07 Motorola, Inc. Method and apparatus for improving battery life in a portable communication receiver
US5568513A (en) * 1993-05-11 1996-10-22 Ericsson Inc. Standby power savings with cumulative parity check in mobile phones
US5406613A (en) * 1993-06-29 1995-04-11 Pacific Communication Sciences, Inc. Method and apparatus for reducing power consumption in cellular telephone by adaptively determining the reliability of the reception of a received message block
WO1995024786A1 (en) * 1994-03-11 1995-09-14 Ntt Mobile Communications Network Inc. Time diversity communication system
FI941221A (en) 1994-03-15 1995-09-16 Nokia Mobile Phones Ltd A method for reducing the power consumption of a radio telephone by a mobile telephone system and a radio telephone
US5590396A (en) * 1994-04-20 1996-12-31 Ericsson Inc. Method and apparatus for a deep-sleep mode in a digital cellular communication system
US5542116A (en) * 1994-05-06 1996-07-30 Motorola, Inc. Power saving system for a mobile radio
GB2290399B (en) * 1994-06-11 1997-10-22 Motorola Israel Ltd Method of operation of a radio system
US5551078A (en) * 1994-07-29 1996-08-27 Motorola, Inc. Apparatus and method for minimizing the turn on time for a receiver operating in a discontinuous receive mode
US5678227A (en) * 1994-07-29 1997-10-14 Motorola, Inc. Apparatus and method for minimizing the turn on time for a receiver operating in a discontinuous receive mode
US5745860A (en) * 1994-12-16 1998-04-28 Telefonaktiebolaget Lm Ericsson Method and system of data transmission and reception in a mobile station within a radio telecommunications system
US6038436A (en) * 1995-05-18 2000-03-14 Ericsson Inc. Method and apparatus for conserving power in portable, battery-operated radios
US5613235A (en) * 1995-06-29 1997-03-18 Nokia Mobile Phones Limited Operation of a radiotelephone in a synchronous extended standby mode for conserving battery power
BR9610449A (en) * 1995-09-05 1999-06-08 Motorola Inc Method and apparatus for determining a response to a control value to control a receive operation at a communication receiver
US7590083B2 (en) 1995-12-07 2009-09-15 Transcore Link Logistics Corp. Wireless packet data distributed communications system
US5752201A (en) * 1996-02-09 1998-05-12 Nokia Mobile Phones Limited Mobile terminal having power saving mode that monitors specified numbers of filler messages
US5878336A (en) * 1996-03-22 1999-03-02 Motorola, Inc. Apparatus and method for discontinuously operating a receiver
JP3163254B2 (en) * 1996-05-31 2001-05-08 松下電器産業株式会社 Digital / analog shared mobile telephone device and standby method thereof
JPH1066125A (en) * 1996-08-21 1998-03-06 Nec Shizuoka Ltd Radio selective calling receiver
US6081733A (en) * 1997-04-16 2000-06-27 Motorola, Inc. Communication control apparatus and method
US6049532A (en) * 1997-05-30 2000-04-11 Motorola, Inc. Method of and apparatus for reducing a power consumption of a communication device
US6101173A (en) * 1998-03-16 2000-08-08 Qualcomm Incorporated Adaptive reacquisition time in a slotted paging environment
US6223047B1 (en) 1998-08-26 2001-04-24 Telefonaktiebolaget Lm Ericsson (Publ) Extended sleep mode method and apparatus
US6434376B1 (en) * 1999-02-12 2002-08-13 Qualcomm, Inc. Slotted idle mode for dual mode subscriber stations
US6381450B1 (en) 1999-04-02 2002-04-30 D.S.P.C. Technologies Ltd. Method and device for managing power consumption of a receiver in stand-by mode
US6501961B1 (en) * 1999-10-05 2002-12-31 Denso Corporation Power saving mode for wireless telephones
GB2410654B (en) * 2004-01-28 2006-11-29 Motorola Inc A mobile station and a method of operation of the mobile station in which a receiver of the mobile station is selectively in a reduced activity state
JP4718595B2 (en) * 2007-12-27 2011-07-06 パナソニック株式会社 Wireless communication system and portable terminal device
GB2494483B (en) * 2012-03-01 2013-10-09 Renesas Mobile Corp Apparatus and method for communication

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4398192A (en) * 1981-12-04 1983-08-09 Motorola Inc. Battery-saving arrangement for pagers
US5058203A (en) * 1988-05-21 1991-10-15 Fujitsu Limited Mobile telephone terminal having selectively used processor unit for low power consumption

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02261226A (en) * 1989-03-31 1990-10-24 Mitsubishi Electric Corp Mobile telephone set
WO1992009146A1 (en) * 1990-10-31 1992-05-29 Motorola, Inc. Battery saver for a communication device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4398192A (en) * 1981-12-04 1983-08-09 Motorola Inc. Battery-saving arrangement for pagers
US5058203A (en) * 1988-05-21 1991-10-15 Fujitsu Limited Mobile telephone terminal having selectively used processor unit for low power consumption

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1062398C (en) * 1993-07-16 2001-02-21 松下电器产业株式会社 Radio communication apparatus
CN1068480C (en) * 1993-07-16 2001-07-11 松下电器产业株式会社 radio communication system
EP0656693A2 (en) * 1993-12-03 1995-06-07 Nokia Mobile Phones Ltd. Method and apparatus for operating a radio telephone
EP0656693A3 (en) * 1993-12-03 1996-04-24 Nokia Mobile Phones Ltd Method and apparatus for operating a radio telephone.
WO1996026619A1 (en) * 1995-02-24 1996-08-29 Telefonaktiebolaget Lm Ericsson Method and apparatus for reducing the power consumption of a battery operated transceiver
AU715661B2 (en) * 1995-02-24 2000-02-10 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for reducing the power consumption of a battery operated transceiver
US6259681B1 (en) 1995-02-24 2001-07-10 Telefonaktiebolaget Lm Ericsson Method and apparatus for reducing the power consumption of a battery operated transceiver
US6119002A (en) * 1997-10-06 2000-09-12 Nokia Mobile Phones Limited Mobile station having methods and apparatus for performing neighbor channel measurements from analog control channel
US6240304B1 (en) 1998-02-11 2001-05-29 Nokia Mobile Phones Ltd. Mobile terminal having RF power consumption optimization of extended standby mode
KR101068744B1 (en) * 2010-03-10 2011-09-28 대성전기공업 주식회사 Integrity Check Method for Data Messages in the Data Communication Using the CAN Protocol

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CA2078232A1 (en) 1992-10-11
US5175874A (en) 1992-12-29
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KR930701023A (en) 1993-03-16
ITRM920258A0 (en) 1992-04-08
MX9201666A (en) 1992-10-01
KR960003839B1 (en) 1996-03-22
ITRM920258A1 (en) 1993-10-08
IT1253991B (en) 1995-09-05
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CA2078232C (en) 1996-04-23
GB9225117D0 (en) 1993-02-17

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