GB2369963A - Battery saving in a radio communication unit - Google Patents

Battery saving in a radio communication unit Download PDF

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Publication number
GB2369963A
GB2369963A GB0030149A GB0030149A GB2369963A GB 2369963 A GB2369963 A GB 2369963A GB 0030149 A GB0030149 A GB 0030149A GB 0030149 A GB0030149 A GB 0030149A GB 2369963 A GB2369963 A GB 2369963A
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GB
United Kingdom
Prior art keywords
access code
time period
power
channel activity
battery
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB0030149A
Other versions
GB0030149D0 (en
Inventor
Stephen David Harris
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorola Solutions Inc
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 GB0030149A priority Critical patent/GB2369963A/en
Publication of GB0030149D0 publication Critical patent/GB0030149D0/en
Publication of GB2369963A publication Critical patent/GB2369963A/en
Withdrawn legal-status Critical Current

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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
    • H04W52/0238—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is an unwanted signal, e.g. interference or idle signal
    • 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
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • 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

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A personal mobile radio is periodically turned on to check channel activity, and an access code such as may be present in a Continuous Tone Controlled Squelch System signal. If channel activity is detected and the access code is incorrect then the personal mobile radio is put into power saving mode for an extended time period (tmax). The extended period is shortened in each cycle until it reaches its minimum predefined value (tmin). The mobile apparatus (2, fig.3) comprises a transceiver/receiver module (20) equipped with an antenna (22), a battery (24), a data analysing module (26) and a power switch (28). The data analysing module (26) is connected to transceiver/receiver module (20) via a first signal connection (36), to the battery (24) via power connection (34), and to the power switch (28) via a second signal connection (38). The power switch (28) interconnects the battery (24) and the transceiver/receiver module (20) by means of power connections (30 and 32).

Description

RADIO COMMUNICATION SYSTEM
Technical Field The present invention relates to the field of radio communication systems. In particular, the invention relates to a method of managing battery life consumption in personal mobile radios (PMR).
Background In known radio communication systems of the prior art, the basic method used for saving battery lifetime is putting the device into the standby mode.
Standby current uses up a major part of the capacity of a battery. One method used by radios is to use a battery saving scheme where sections of circuitry are turned off (put to standby mode) to conserve power. Then periodically these sections are woken up, and a check is made to see if there is any channel activity. If not, the radio goes back to sleep. However, activity of other users or user groups whom you are not interested in on the channel will cause the radio to come out of battery save.
The total battery save cycle time must be kept short enough so that the radio does not miss too much of the start of a transmission. Typically this is 0.2 or 0.3 seconds. Longer times will result in missing the start transmissions.
Any channel activity will bring the radio out of the battery save mode. If the received Continuous Tone Controlled Squelch System (also called CTCSS) signal is wrong, the radio goes into non-battery save standby, continuously decoding CTCSS. This has the unfortunate effect that any activity on the channel stops battery save, even when the radio remains muted. Thus if the channel is busy with other users, the radio's standby battery life will be reduced.
Summary of the Invention It is an object of the present invention to provide a novel method and system for managing a battery life consumption in personal mobile radios for use in radio communication systems, which overcomes the disadvantages of the prior art.
In accordance with the present invention, there is thus provided a method for managing battery life consumption. The method comprises the steps of
detecting a channel activity and an access code. Detected signals are analysed.
Depending on the results of this analysis, the PMR is put into power saving mode for either an extended period of time or a shortened period of time. Use of the extended period of time of the power saving mode allows saving battery life.
In accordance with another aspect of the present invention there is provided a system for managing a battery life consumption in personal mobile radios. The system includes a transceiver/receiver module that can transmit speech and is connected to a data analysing module, that is connected to the battery and controls a power switch. The battery is connected to the transceiver/receiver module via the power switch.
Brief description of the drawings The present invention will be understood and appreciated more fully from the following detailed description taken in conjunction with the drawings in which: Figure 1 is a schematic illustration of a radio communication system; Figure 2 is a diagram illustrating the time dependence of changes of operation modes of a personal mobile radio operating in accordance with a preferred embodiment of the present invention; Figure 3 is a schematic illustration of a personal mobile radio, constructed and operative in accordance with a preferred embodiment of the present invention.
Detailed description of the preferred embodiment The term a"personal mobile radio"as described henceforth includes both a"portable"and a"mobile"radio. A mobile radio is typically an in-vehicle radio.
The term"cycle"herein below refers to a sequence of operations carried by the personal mobile radio. This sequence is periodically repeated, and comprises: putting the radio into active mode, checking for channel activity signal, checking for access code and putting the radio into power saving mode.
Figure 1 illustrates the general scheme of a personal mobile radio (PMR) system 10 with PMRs operating in accordance with the present invention.
Portable radios 2,4 and 6 of figure 1 can communicate with a base station 8.
Radios 2, 4 and 6 could equally well be mobile radios mounted in vehicles. Each of the radios shown in figure 1 can communicate through base station 8 with one or more other radios. If radios 2,4 and 6 are capable of direct mode operation, then they may communicate directly with one another or with other radios, without the communication link passing through base station 8.
Figure 2 illustrates time dependent changes of operation modes of a PMR operating in accordance with the present invention. In general the PMR is in one of two possible modes of operation: an active mode and a power saving mode (also named standby mode when some sections of its circuitry are turned off).
When a channel activity signal is first detected, but an access code is wrong, then this must be the start of a transmission. In this case it will be safe to go to power saving mode for a predefined extended time period tmax.
This extended time period can be for example e. g. 2 seconds. After the predefined extended time period the radio checks again for squelch and access code. The access code in the case of analogue PMR systems could be a Continuous Tone Controlled Squelch System signal (also called CTCSS signal). Then the PMR is periodically put into the active mode to check channel activity. Subsequent cycles need to be shorter, so as not to miss the end of this transmission and potentially the start of another transmission with the correct access code.
The extended time period of the power saving mode in subsequent cycles could be shortened in each cycle by a predefined percentage value in comparison to this time period in the previous cycle. This predefined percentage value could be for example 10%. Alternatively the extended time period could be shortened by a predefined constant value (e. g. 0,2 second) in each cycle.
Shortening of the time period of the standby mode proceeds until it reaches a minimum predefined value tmm (e. g. in the range from 0,1 to 1 second).
When a channel activity (carrier) is detected and the access code is correct, then this must be the start of a transmission directed to this PMR, so the PMR will go into active mode and will be maintained in this mode until the end of the transmission. After termination of the transmission, the PMR is put into power saving mode for the minimum predefined time period tm.
When the time period of the power saving mode reaches its minimum value, tm, n, it stays at this level until the next channel activity with an incorrect access code is detected. When channel activity with an incorrect access code is detected, the time period of the power saving mode returns to tmax.
Portable mobile radio 2 of figure 3 can transmit speech from a user of the radio. The radio comprises a transceiver/receiver module 20 equipped with an antenna 22 which receives and transmits radio signals. Portable mobile radio 2 also comprises a battery 24, data analysing module 26 and power switch 28.
The power switch 28 interconnects the battery 24 and the transceiver/receiver module 20 by means of power connections 30 and 32.
The data analysing module 26 is connected via power connection 34 to the battery 24 and by means of a first data connection 36 to transceiver/receiver module 20. The transceiver/receiver module transmits, via the first data connection 36, data on the signal received and an access code. The data analysing module 26 analyses data received from the transceiver/receiver module 20, and controls the power switch 28 to which it is connected via a second signal connection 38.

Claims (16)

Claims
1. A method of managing battery life consumption in a personal mobile radio, the personal mobile radio being in power saving mode and being periodically turned on to check channel activity, the method comprising the steps of: - checking the channel activity; - checking for the correct access code; - putting the personal mobile radio into power saving mode for an extended time period (tmgj if channel activity was detected and the access code was incorrect.
2. The method according to claim 1 further comprising the step of maintaining the device in active mode if channel activity was detected and the access code was correct.
3. The method according to claim 1 further comprising periodic checking of channel activity and checking for the correct access code, and putting the device into power saving mode for a shortened time period in each cycle.
4. The method according to claim 1 wherein said extended time period is a predefined period.
5. The method according to claim 3 wherein said shortened time period is not shorter than a minimum predefined value (tm, J.
6. The method according to claim 3 wherein said shortened time is shortened in each cycle by the same percentage value in comparison to the time period of the power saving mode in the previous cycle.
7. The method according to claim 3 wherein said shortened time period is shortened in each cycle by a constant value.
8. The method according to claim 5 wherein said shortened time period of said power saving mode, after reaching its minimum value, remains at this value until the next channel activity with an incorrect access code is detected.
9. The method according to claim 2 wherein said communication device is put into power saving mode for said minimum predefined time period (tmm) after termination of the transmission.
10. The method according to claim 1 wherein said access code is in particular a Continuous Tone Controlled Squelch System signal.
11. The method according to claim 4 wherein said predefined value of the extended time (tax) is set to substantially 2 seconds.
12. The method according to claim 5 wherein said minimum predefined value (tam) of said shortened time is in the range from 0.1 to 1 second.
13. A power management system for use in a personal mobile radio, comprising a transceiver/receiver module and a battery, said system comprising: - a data analysing module that is connected to said battery via a power connection and to said transceiver/receiver module via a first signal connection, - a power switch that interconnects said battery and said transceiver/receiver module by means of power connections, and that is connected to said data analysing module via a second signal connection, whereby the data analysing module controls the switch by means of the second signal connection.
14. A power management system according to claim 13, said data analysing module being adapted to analyse data comprising: - data about the signal received, - an access code.
15. A power management system according to claim 14 wherein said data indicates that the signal received is a carrier.
16. A power management system according to claim 14 wherein said access code is a Continuous Tone Controlled Squelch System signal.
GB0030149A 2000-12-11 2000-12-11 Battery saving in a radio communication unit Withdrawn GB2369963A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0030149A GB2369963A (en) 2000-12-11 2000-12-11 Battery saving in a radio communication unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0030149A GB2369963A (en) 2000-12-11 2000-12-11 Battery saving in a radio communication unit

Publications (2)

Publication Number Publication Date
GB0030149D0 GB0030149D0 (en) 2001-01-24
GB2369963A true GB2369963A (en) 2002-06-12

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GB0030149A Withdrawn GB2369963A (en) 2000-12-11 2000-12-11 Battery saving in a radio communication unit

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GB (1) GB2369963A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004032349A1 (en) * 2002-10-02 2004-04-15 Batelle Memorial Institute Radio frequency identification devices, backscatter communication device wake-up methods, communication device wake-up methods and a radio frequency identification device wake-up method
WO2005053339A1 (en) * 2003-11-27 2005-06-09 Matsushita Electric Industrial Co., Ltd. Radio communication device and control data retrieving method
EP1942587A1 (en) * 2005-10-28 2008-07-09 NEC Corporation Mobile communication system, base station, mobile station, and power-saving transmission/reception method used in them

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0473465A1 (en) * 1990-08-27 1992-03-04 Audiovox Corporation Power saving arrangement and method in portable cellular telephone system
JPH04115632A (en) * 1990-08-31 1992-04-16 Fujitsu Ltd Pager terminal
WO1992008295A1 (en) * 1990-10-24 1992-05-14 Motorola, Inc. Receiver with battery saver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0473465A1 (en) * 1990-08-27 1992-03-04 Audiovox Corporation Power saving arrangement and method in portable cellular telephone system
JPH04115632A (en) * 1990-08-31 1992-04-16 Fujitsu Ltd Pager terminal
WO1992008295A1 (en) * 1990-10-24 1992-05-14 Motorola, Inc. Receiver with battery saver

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004032349A1 (en) * 2002-10-02 2004-04-15 Batelle Memorial Institute Radio frequency identification devices, backscatter communication device wake-up methods, communication device wake-up methods and a radio frequency identification device wake-up method
US7019617B2 (en) 2002-10-02 2006-03-28 Battelle Memorial Institute Radio frequency identification devices, backscatter communication device wake-up methods, communication device wake-up methods and a radio frequency identification device wake-up method
WO2005053339A1 (en) * 2003-11-27 2005-06-09 Matsushita Electric Industrial Co., Ltd. Radio communication device and control data retrieving method
US9432935B2 (en) 2005-10-28 2016-08-30 Nec Corporation Mobile communication system, base station, mobile station, and power-saving transmission and reception method used in them
EP1942587A4 (en) * 2005-10-28 2012-10-10 Nec Corp Mobile communication system, base station, mobile station, and power-saving transmission/reception method used in them
EP2541996A1 (en) * 2005-10-28 2013-01-02 Nec Corporation Mobile communication system, base station, mobile station, and power-saving transmission and reception method used in them
EP2541997A1 (en) * 2005-10-28 2013-01-02 Nec Corporation Mobile communication system, base station, mobile station, and power-saving transmission and reception method used in them
US8514727B2 (en) 2005-10-28 2013-08-20 Nec Corporation Mobile communication system, base station, mobile station, and power-saving transmission and reception method used in them
EP1942587A1 (en) * 2005-10-28 2008-07-09 NEC Corporation Mobile communication system, base station, mobile station, and power-saving transmission/reception method used in them
EP3193544A1 (en) * 2005-10-28 2017-07-19 NEC Corporation Base station, mobile station, and power-saving transmission and reception method used in them
US10164915B2 (en) 2005-10-28 2018-12-25 Nec Corporation Mobile communication system, base station, mobile station, and power-saving transmission and reception method used in them
EP3451746A1 (en) * 2005-10-28 2019-03-06 NEC Corporation Mobile station and method for power-saving transmission and reception
EP3651507A1 (en) * 2005-10-28 2020-05-13 NEC Corporation Mobile communication system, base station, mobile station, and power-saving transmission and reception method used in them
US10700999B2 (en) 2005-10-28 2020-06-30 Nec Corporation Mobile communication system, base station, mobile station, and power-saving transmission and reception method used in them
US10904166B2 (en) 2005-10-28 2021-01-26 Nec Corporation Mobile communication system, base station, mobile station, and power-saving transmission and reception method used in them
US11489790B2 (en) 2005-10-28 2022-11-01 Nec Corporation Mobile communication system, base station, mobile station, and power-saving transmission and reception method used in them

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Publication number Publication date
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