CA1306013C - Mobile telephone station with power saving circuit - Google Patents
Mobile telephone station with power saving circuitInfo
- Publication number
- CA1306013C CA1306013C CA000612469A CA612469A CA1306013C CA 1306013 C CA1306013 C CA 1306013C CA 000612469 A CA000612469 A CA 000612469A CA 612469 A CA612469 A CA 612469A CA 1306013 C CA1306013 C CA 1306013C
- Authority
- CA
- Canada
- Prior art keywords
- signal
- need
- base station
- mobile station
- frequency synthesizer
- 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.)
- Expired - Lifetime
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
-
- 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
-
- 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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- 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
Abstract
ABSTRACT OF THE DISCLOSURE
A mobile station comprises a receiver for receiving a signal from the base station and a transmitter including a frequency synthesizer, a modulator and a power amplifier connected to it. For power savings purposes, the transmitter is deactivated during a standby mode. If an earlier portion of a signal received from the base station indicates a likelihood of a need to return an acknowledgment, power is supplied to the frequency synthesizer to allow it to stabilize in advance. If a later portion of the received signal indicate that there actually exists the need to acknowledge the receipt of the signal, the power amplifier is subsequently activated and an acknowledgment signal is returned through it to the base station. If the later portion of the received signal indicates the absence of the need to acknowledge, the frequency synthesizer is again deactivated and the power amplifier remains deactivated.
A mobile station comprises a receiver for receiving a signal from the base station and a transmitter including a frequency synthesizer, a modulator and a power amplifier connected to it. For power savings purposes, the transmitter is deactivated during a standby mode. If an earlier portion of a signal received from the base station indicates a likelihood of a need to return an acknowledgment, power is supplied to the frequency synthesizer to allow it to stabilize in advance. If a later portion of the received signal indicate that there actually exists the need to acknowledge the receipt of the signal, the power amplifier is subsequently activated and an acknowledgment signal is returned through it to the base station. If the later portion of the received signal indicates the absence of the need to acknowledge, the frequency synthesizer is again deactivated and the power amplifier remains deactivated.
Description
13~6~3 1 7102~-118 TITLE OF THE INVENTION
"Mobile Telephone Station With Power Saving Circuit"
BACKGROUND OF THE INVENTION
The present invention relates generally to mobile kelephone systems, and more specifically to a technique for sa~ing the power consumption of the mobile stations of the system.
A known mobile telephone station served by a system such as Nordic Mobile Telephone System (NMT-450) is so deslgned that during a standby period the transmitter of the mobile station is always activated in readiness to return an acknowledgment signal within the specified period of 30 milliseconds in response to a calling signal from the base station. This is due to the fact that the specified response time is smaller than the time it would take to stabilize the mobile transmitter from an inactive state. However, it has been desired to cu~ off power supplies to the transmitter, i.e., the power consuming unit of the mobile station, during standby periods for power savings purposes.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a mobile telephone station with a power saving circuit for a system that elicits an acknowledgment response within a period of time smaller than the warm-up time of a power consuming transmit unit.
According to the present lnvention, th~ mobile station comprises receiver means for receiving a signal from said base ~`
~3C~ 3 2 710~4-118 station; transmitter means ~or transmitting signals to said base station; and control means coupled to said transmitter means for deactivating said transmitter means during a standby ~ode of said mobile station to save power consumption, said control means being further coupled to said receiver means for determining from an earlier portion of a signal received by said receiver means that there is likelihood of a need to return said acknowledgment and supplying power to said transmitter means in advance and determining from a later portion of said received si~nal whether said need actually exists or not, and causing said transmitter means to transmit said acknowledgment if the determination from the later portion indicates the presence of said need or deactivating said transmitter means again if the determination from the later portion indicates the absence of said need.
In a more specific aspect, the transmitter comprises a frequency synthesizer for generating a carriar, a modulator for modulating the carrier with a signal to be transmitted to the base station, and a power amplifier for amplifying the modulated carrier for transmission to the base station. The frequency synthesizer has a warm-up time longer than the response time specified by the base station. The control circuit supplies power to the frequency synthesizer ~hen the determination from the earlier portion of a received signal indicates the presence of .
. .
13~)6C313 2a 71024-118 the likelihood of returning an acknowledgmenkr and then supplies power to the power amplifier if the determination from the later portion indicates the presence of the actual need to acknowledge the recaipt of the signal and deactivates the ~requenc~
synthesizer if the determination f:rom the later portion indicates the absence of the need to acknowl~edge. In a practical aspect r the earlier and later portions of the received signal are earliex and last digits, respectively, of a subscriber ldentification number assigned to the mobile station.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be described in further detail with reference NE-220 13 ~6 3 ~ 3 -to the accompanying drawings, in which:
2 Fig. 1 is a block diagram of El base station of a mobile telephone system3 embodying the present invention;
4 liig. 2 is a block d;agram of a mobile station of the system of 3iig. 1;
s Fig. 3 is a flowcha~ describing a sequenoe of operations performed by 6 the central controller of the mobile statiDn; and 7 Fig. 4 is a timing diagram associate~d with the transmit synthesizer andg the power ampliAer of Fig. 2 for power savings operation.
9 DETAILF.D DESCRIPIION
Referring now to Fig. 1, there is shown a base station (BS~ of a molbile 1 1 telephone system according to the present invention. The sys}em includes a 12 plurality of mobile stations (MS) one of which is shown in Fig. 2. Radio 13 signals f~om the mobile stations are detected by base-station antenna 1 and14 passed through a duplexer 2 and a ~eceive cs)upler 3 to n receive channels each consisting of a receiver 4 and a demultiplexer 5. The signal received 16 at the input of each receiver 4 is frequency-demodulated into a baseband 17 signal and then demultiplexed by the associated demultiplexer 5 into a 18 speech signal and a switching control signal. The speech and conirol 19 signals are respecti~ely supplied to a receive interface 6 and a decoder 7.2 0 Decoder 7 analyzes the switching control signal and supplies a decoded 21 signal to a controller 8 to permit it to control the interface 6 fs)r setting up 2 2 an up-direction (M~t~BS) speech path of a full-duplex circuit through a 23 telephone switching system 9 which forms a part of the public telephone 2 4 network.
2 5 A down-direction (BS-t~MS) speech path of the full-duplex circuit is 26 established to El mobile station from the telephone switching system 9 36q~13 through a transmit interface 10 which cooperates with the controller 8 to 2 send a necessary control signal from an encoder 11. This control signal is 3 multiplexed with speech signal from the telephone switching system 9 by 4 one of multiplexers 12-1 through 12-n which is selected. The multiplexed S signals are modulated upon a carrier by one of transmitters l~1 through 6 l~n which is associated with the selected multiplexer and passed through 7 a transmit coupler 14 and duplexer 2 to antenna 1 for transmission to the 8 mobile station.
9 The control signal to a mobile station comprises channel number l O inforrnation indicating the selected calling channel, a prefix that indicates 11 the status of the channel (call or standby), a traffic area number indicating l 2 the base station iden$ification, a 6-digit mobile subscriber identificationl 3 number, and a four-digit idle field. If the control signal is "a call to mobile 14 station," controller 8 requests the called station to return an 1~ acknowledgment response within a specified period of time, typically 30 l 6 milliseconds, from the reception of the 6th digit of the identification l 7 number of the called station. If controller 8 ~ails to detect a response within l 8 the specified period, the called station is recognized as being inaccessible l 9 and the call is abandoned.
2 o Referring to Fig. 2, a radio signal from the base station is detected by21 antenna 21 and passed through duplexer 22 to a high-frequency amplifier 22 23. After amplification, the radio signal is ;passed through a band-pass 2 3 filter 24 to a first mixer 25 where it is frequency-demodulated to a first 24 intermediate frequency signal with a carrier supplied from a local 2 s frequency syntheslzer 26. The output of mLxer 25 is passed through a band-2 6 pass filter 27 to a second mixer 28 where the first IF signal is frequency-~lL306~i3 demodulated with a carrier supplîed from a local oscillator 29 into a second 2 IF signal, which is band-limited by a band-pass filter 30, amplified to a 3 constant high amplitude level by a limiter amplifier 31, and supplied to a 4 frequency discriminator 32. FM detection is provided by the discriminator 5 32 to recvver the original baseband signal.
"Mobile Telephone Station With Power Saving Circuit"
BACKGROUND OF THE INVENTION
The present invention relates generally to mobile kelephone systems, and more specifically to a technique for sa~ing the power consumption of the mobile stations of the system.
A known mobile telephone station served by a system such as Nordic Mobile Telephone System (NMT-450) is so deslgned that during a standby period the transmitter of the mobile station is always activated in readiness to return an acknowledgment signal within the specified period of 30 milliseconds in response to a calling signal from the base station. This is due to the fact that the specified response time is smaller than the time it would take to stabilize the mobile transmitter from an inactive state. However, it has been desired to cu~ off power supplies to the transmitter, i.e., the power consuming unit of the mobile station, during standby periods for power savings purposes.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a mobile telephone station with a power saving circuit for a system that elicits an acknowledgment response within a period of time smaller than the warm-up time of a power consuming transmit unit.
According to the present lnvention, th~ mobile station comprises receiver means for receiving a signal from said base ~`
~3C~ 3 2 710~4-118 station; transmitter means ~or transmitting signals to said base station; and control means coupled to said transmitter means for deactivating said transmitter means during a standby ~ode of said mobile station to save power consumption, said control means being further coupled to said receiver means for determining from an earlier portion of a signal received by said receiver means that there is likelihood of a need to return said acknowledgment and supplying power to said transmitter means in advance and determining from a later portion of said received si~nal whether said need actually exists or not, and causing said transmitter means to transmit said acknowledgment if the determination from the later portion indicates the presence of said need or deactivating said transmitter means again if the determination from the later portion indicates the absence of said need.
In a more specific aspect, the transmitter comprises a frequency synthesizer for generating a carriar, a modulator for modulating the carrier with a signal to be transmitted to the base station, and a power amplifier for amplifying the modulated carrier for transmission to the base station. The frequency synthesizer has a warm-up time longer than the response time specified by the base station. The control circuit supplies power to the frequency synthesizer ~hen the determination from the earlier portion of a received signal indicates the presence of .
. .
13~)6C313 2a 71024-118 the likelihood of returning an acknowledgmenkr and then supplies power to the power amplifier if the determination from the later portion indicates the presence of the actual need to acknowledge the recaipt of the signal and deactivates the ~requenc~
synthesizer if the determination f:rom the later portion indicates the absence of the need to acknowl~edge. In a practical aspect r the earlier and later portions of the received signal are earliex and last digits, respectively, of a subscriber ldentification number assigned to the mobile station.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be described in further detail with reference NE-220 13 ~6 3 ~ 3 -to the accompanying drawings, in which:
2 Fig. 1 is a block diagram of El base station of a mobile telephone system3 embodying the present invention;
4 liig. 2 is a block d;agram of a mobile station of the system of 3iig. 1;
s Fig. 3 is a flowcha~ describing a sequenoe of operations performed by 6 the central controller of the mobile statiDn; and 7 Fig. 4 is a timing diagram associate~d with the transmit synthesizer andg the power ampliAer of Fig. 2 for power savings operation.
9 DETAILF.D DESCRIPIION
Referring now to Fig. 1, there is shown a base station (BS~ of a molbile 1 1 telephone system according to the present invention. The sys}em includes a 12 plurality of mobile stations (MS) one of which is shown in Fig. 2. Radio 13 signals f~om the mobile stations are detected by base-station antenna 1 and14 passed through a duplexer 2 and a ~eceive cs)upler 3 to n receive channels each consisting of a receiver 4 and a demultiplexer 5. The signal received 16 at the input of each receiver 4 is frequency-demodulated into a baseband 17 signal and then demultiplexed by the associated demultiplexer 5 into a 18 speech signal and a switching control signal. The speech and conirol 19 signals are respecti~ely supplied to a receive interface 6 and a decoder 7.2 0 Decoder 7 analyzes the switching control signal and supplies a decoded 21 signal to a controller 8 to permit it to control the interface 6 fs)r setting up 2 2 an up-direction (M~t~BS) speech path of a full-duplex circuit through a 23 telephone switching system 9 which forms a part of the public telephone 2 4 network.
2 5 A down-direction (BS-t~MS) speech path of the full-duplex circuit is 26 established to El mobile station from the telephone switching system 9 36q~13 through a transmit interface 10 which cooperates with the controller 8 to 2 send a necessary control signal from an encoder 11. This control signal is 3 multiplexed with speech signal from the telephone switching system 9 by 4 one of multiplexers 12-1 through 12-n which is selected. The multiplexed S signals are modulated upon a carrier by one of transmitters l~1 through 6 l~n which is associated with the selected multiplexer and passed through 7 a transmit coupler 14 and duplexer 2 to antenna 1 for transmission to the 8 mobile station.
9 The control signal to a mobile station comprises channel number l O inforrnation indicating the selected calling channel, a prefix that indicates 11 the status of the channel (call or standby), a traffic area number indicating l 2 the base station iden$ification, a 6-digit mobile subscriber identificationl 3 number, and a four-digit idle field. If the control signal is "a call to mobile 14 station," controller 8 requests the called station to return an 1~ acknowledgment response within a specified period of time, typically 30 l 6 milliseconds, from the reception of the 6th digit of the identification l 7 number of the called station. If controller 8 ~ails to detect a response within l 8 the specified period, the called station is recognized as being inaccessible l 9 and the call is abandoned.
2 o Referring to Fig. 2, a radio signal from the base station is detected by21 antenna 21 and passed through duplexer 22 to a high-frequency amplifier 22 23. After amplification, the radio signal is ;passed through a band-pass 2 3 filter 24 to a first mixer 25 where it is frequency-demodulated to a first 24 intermediate frequency signal with a carrier supplied from a local 2 s frequency syntheslzer 26. The output of mLxer 25 is passed through a band-2 6 pass filter 27 to a second mixer 28 where the first IF signal is frequency-~lL306~i3 demodulated with a carrier supplîed from a local oscillator 29 into a second 2 IF signal, which is band-limited by a band-pass filter 30, amplified to a 3 constant high amplitude level by a limiter amplifier 31, and supplied to a 4 frequency discriminator 32. FM detection is provided by the discriminator 5 32 to recvver the original baseband signal.
6 A demultiplexer 33 separates the baseband signal into speech and 7 control signals and couples these signals to a loudspeaker 34 and a decoder 8 35, respectively, in response to a control signal ~rom a central controller 36.
9 The control signal is analyzed by the decoder 35 and fed to the central 10 controller 36. ~requency synthesizer 26 is controlled by the controller 36 to 1 1 tune to the frequency of the calling channel selected by the base station.
12 Speech signal from a microphone 38 is applied to a multiplexer 39 13 which combines it in response to a signal from the central controller 36 with 14 a control signal supplied from an encoder 37. If a call is originated from a 1 5 mobile station or received from the base sta~ion, central controller 36 16 cooperates with the encoder 37 to generate an appropriate control signal 17 by including in it the ~digit mobile station ID number. The output of l 8 multiplexer 39 is fed to a mixer 41 where it is frequency-modulated upon a 1 9 carrier supplied from a frequency synthesizer 40 which is also controlled by 20 central controller 36. The output of mixer 41 is amplified by a high-21 frequency amplifier 42 and band-limited by a band-pass filter 43 and fed to 2 2 a power amplifier 44 where i$ is amplified to a required level and applied 2 3 through duplexer 22 to antenna 21. A power controller 45 is connected to 2 4 the output of power amplifier 44 to control the output of amplifier 44 at a 2 5 constant power level.
26 According to the present invention, central controller 36 further ~3~
provides power on-off control Eor power savings purposes by deactivating the frequency synthesizer 40 and power amplifier 44 during standby periods in a manner as will be described hereinbelow.
As shown in Fig. 3, the central controller 36 is programmed to provide power savings opera-tion. The program starts with operations block 51 by causing demultiplexer ~3 to couple the output of discriminator 32 to decoder 35, mulkiplexer 39 to couple the output of encoder 37 to mixer 41 and freguency synthesizer 26 to be tuned to the calling channel, and turning off power supplies to the frequency synthesizer 40 and power amplifier 44 through controller 45. In this way, the mobile station is in a standby state ready to receive a calling signal transmitted on the calling channel from the base station. Exit then is to decision block 52 which determines if the 5th digit of the mobile station ID number is received or not. If it is, control determines that there is a possibility of the need to return an acknowledgment response and exits to operations block 53 to activate the frequency synthesizer 40. Frequency synthesizer 40 takes 50 milliseconds to stabilize the oscillation of the required frequency it generates as shown in Fi~. 4. Exit then is to decision block 54 which checks to see if the 6th digit of the station ID number is received. If the answer is affirmative, control recognizes that the received signal is a call destined to the mobile station and proceeds to block 55 to .~
,.. . .
~3~6~
7 71024-llg introduce a delay time T by reset-ting the count (t) of a timer to zero and goes to block 56 to increment it by a unit value. Blocks 55 and 56 are repeated until the count "t" i6 equal ~o a predetermined value T which is smaller than a value corresponding to 30 milliseconds.
If the answer is negative in desicion block 54, control returns to block Sl to deactivate the frequency synthesizer 49, recognizing that the call is destined to another mobile station.
When time interval T has elapsed from the reception of the 6th digit, control exits to operations block 58 to activate ~he power amplifier 44 by directing the power controller 45 to turn on its power supply.
Control then advances to operations block 59 to increment the count (t) by a unit value and goes to decision block 60 to check to see if count (t) is equal to a valua ~orresponding to the 30-ms response time specified by the base station. If the response time has elapsed, control proceeds to block 61 to allow encoder 37 to generate and transmit the mobile station's ID
number as an acknowledgment response.
As shown in Fig.4, there is a time interval of 26.6 milliseconds between the 5th and 6th digits. A total of 56.6 milliseconds is therefore allowed for the frequency synthesizer 40 to stabilize its oscillation. Power amplifier 44 can reach its steady state within a period of only 1 millisecond. Loss of power can be minimized by suitably selecting the delay interval T so ~3~)6~3 8 7~024-118 ~hat the activation of the power amplifier 44 coincides with the stabilization of the synthesizer 40. Following the transmission of the mobile station's ID, the mobile station receives a channel allocation signal on the calling channel from the base station.
When this signal is received, controller 36 sets the frequency synthesizers 26 and 40 to the respectively allocated channels in order to receive protocols from the switched telephone network via the base station and returns a necessary protocol to establish a connection. After establishing the connection, the controller 36 causes demultiplexer 32 to couple the output of discriminator 32 to loudspeaker 34 and multiplexer 38 to couple the output of microphone 38 to mixer 41. The mobile station is now in a talking mode.
Control then exits to decision block 62 to determine if the call is terminatedr and if it i5, control recognizes that the mobile station enters a standby state and returns to block 51 to deactivate the frequency synthesizer 40 and power amplifier 44.
The foregoing description shows only one preferred embodiment of the present invention. Various modi~ications are apparent to those s~illed in the art without departing from the scope of the present invention which is only limited by the appended claims. Therefore, the embodimen~ shown and described is only illustrative r not restrictive.
. ,~ i
12 Speech signal from a microphone 38 is applied to a multiplexer 39 13 which combines it in response to a signal from the central controller 36 with 14 a control signal supplied from an encoder 37. If a call is originated from a 1 5 mobile station or received from the base sta~ion, central controller 36 16 cooperates with the encoder 37 to generate an appropriate control signal 17 by including in it the ~digit mobile station ID number. The output of l 8 multiplexer 39 is fed to a mixer 41 where it is frequency-modulated upon a 1 9 carrier supplied from a frequency synthesizer 40 which is also controlled by 20 central controller 36. The output of mixer 41 is amplified by a high-21 frequency amplifier 42 and band-limited by a band-pass filter 43 and fed to 2 2 a power amplifier 44 where i$ is amplified to a required level and applied 2 3 through duplexer 22 to antenna 21. A power controller 45 is connected to 2 4 the output of power amplifier 44 to control the output of amplifier 44 at a 2 5 constant power level.
26 According to the present invention, central controller 36 further ~3~
provides power on-off control Eor power savings purposes by deactivating the frequency synthesizer 40 and power amplifier 44 during standby periods in a manner as will be described hereinbelow.
As shown in Fig. 3, the central controller 36 is programmed to provide power savings opera-tion. The program starts with operations block 51 by causing demultiplexer ~3 to couple the output of discriminator 32 to decoder 35, mulkiplexer 39 to couple the output of encoder 37 to mixer 41 and freguency synthesizer 26 to be tuned to the calling channel, and turning off power supplies to the frequency synthesizer 40 and power amplifier 44 through controller 45. In this way, the mobile station is in a standby state ready to receive a calling signal transmitted on the calling channel from the base station. Exit then is to decision block 52 which determines if the 5th digit of the mobile station ID number is received or not. If it is, control determines that there is a possibility of the need to return an acknowledgment response and exits to operations block 53 to activate the frequency synthesizer 40. Frequency synthesizer 40 takes 50 milliseconds to stabilize the oscillation of the required frequency it generates as shown in Fi~. 4. Exit then is to decision block 54 which checks to see if the 6th digit of the station ID number is received. If the answer is affirmative, control recognizes that the received signal is a call destined to the mobile station and proceeds to block 55 to .~
,.. . .
~3~6~
7 71024-llg introduce a delay time T by reset-ting the count (t) of a timer to zero and goes to block 56 to increment it by a unit value. Blocks 55 and 56 are repeated until the count "t" i6 equal ~o a predetermined value T which is smaller than a value corresponding to 30 milliseconds.
If the answer is negative in desicion block 54, control returns to block Sl to deactivate the frequency synthesizer 49, recognizing that the call is destined to another mobile station.
When time interval T has elapsed from the reception of the 6th digit, control exits to operations block 58 to activate ~he power amplifier 44 by directing the power controller 45 to turn on its power supply.
Control then advances to operations block 59 to increment the count (t) by a unit value and goes to decision block 60 to check to see if count (t) is equal to a valua ~orresponding to the 30-ms response time specified by the base station. If the response time has elapsed, control proceeds to block 61 to allow encoder 37 to generate and transmit the mobile station's ID
number as an acknowledgment response.
As shown in Fig.4, there is a time interval of 26.6 milliseconds between the 5th and 6th digits. A total of 56.6 milliseconds is therefore allowed for the frequency synthesizer 40 to stabilize its oscillation. Power amplifier 44 can reach its steady state within a period of only 1 millisecond. Loss of power can be minimized by suitably selecting the delay interval T so ~3~)6~3 8 7~024-118 ~hat the activation of the power amplifier 44 coincides with the stabilization of the synthesizer 40. Following the transmission of the mobile station's ID, the mobile station receives a channel allocation signal on the calling channel from the base station.
When this signal is received, controller 36 sets the frequency synthesizers 26 and 40 to the respectively allocated channels in order to receive protocols from the switched telephone network via the base station and returns a necessary protocol to establish a connection. After establishing the connection, the controller 36 causes demultiplexer 32 to couple the output of discriminator 32 to loudspeaker 34 and multiplexer 38 to couple the output of microphone 38 to mixer 41. The mobile station is now in a talking mode.
Control then exits to decision block 62 to determine if the call is terminatedr and if it i5, control recognizes that the mobile station enters a standby state and returns to block 51 to deactivate the frequency synthesizer 40 and power amplifier 44.
The foregoing description shows only one preferred embodiment of the present invention. Various modi~ications are apparent to those s~illed in the art without departing from the scope of the present invention which is only limited by the appended claims. Therefore, the embodimen~ shown and described is only illustrative r not restrictive.
. ,~ i
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A mobile station for exchanging signals with a base station which requests an acknowledgment to be returned from the mobile station within a specified period of time from reception of a signal from the base station, comprising:
receiver means for receiving a signal from said base station; and transmitter means for transmitting signals to said base station; and control means coupled to said transmitter means for deactivating said transmitter means during a standby mode of said mobile station to save power consumption, said control means being further coupled to said receiver means for determining from an earlier portion of a signal received by said receiver means that there is likelihood of a need to return said acknowledgement and supplying power to said transmitter means in advance and determining from a later portion of said received signal whether said need actually exists or not, and causing said transmitter means to transmit said acknowledgment if the determination from the later portion indicates the presence of said need or deactivating said transmitter means again is the determination from the later portion indicates the presence of said need or deactivating said transmitter means again if the determination from the later portion indicates the absence of said need.
receiver means for receiving a signal from said base station; and transmitter means for transmitting signals to said base station; and control means coupled to said transmitter means for deactivating said transmitter means during a standby mode of said mobile station to save power consumption, said control means being further coupled to said receiver means for determining from an earlier portion of a signal received by said receiver means that there is likelihood of a need to return said acknowledgement and supplying power to said transmitter means in advance and determining from a later portion of said received signal whether said need actually exists or not, and causing said transmitter means to transmit said acknowledgment if the determination from the later portion indicates the presence of said need or deactivating said transmitter means again is the determination from the later portion indicates the presence of said need or deactivating said transmitter means again if the determination from the later portion indicates the absence of said need.
2. A mobile station as claimed in claim 1, wherein said transmitter means comprises frequency synthesizer means for generating a carrier, means for modulating a signal to be transmitted to said base station upon said carrier, and a power amplifier for amplifying the modulated carrier for transmission to said base station, said frequency synthesizer means having a longer warm-up time than said specified period to stabilize the frequency of said carrier, wherein said control means supplies power to said frequency synthesizer means when the determination from said earlier portion indicates the presence of said likelihood, and supplies power to said power amplifier if the determination from said later portion indicates the presence of said need and deactivating said frequency synthesizer means if the determination from said later portion indicates the absence of said need.
3. A mobile station as claimed in claim 2, wherein said earlier and later portions of said received signal are earlier and last digits, respectively, of a subscriber identification number assigned to said mobile station.
4. A mobile station as claimed in claim 2, wherein said control means supplies power to the power amplifier so that the power amplifier is activated sufficiently for amplification at a point in time substantially coincident with the time at which the carrier generated by said frequency synthesizer means is stabilized.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63-241486 | 1988-09-26 | ||
| JP63241486A JP2805767B2 (en) | 1988-09-26 | 1988-09-26 | Wireless transceiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1306013C true CA1306013C (en) | 1992-08-04 |
Family
ID=17075031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000612469A Expired - Lifetime CA1306013C (en) | 1988-09-26 | 1989-09-22 | Mobile telephone station with power saving circuit |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5031231A (en) |
| EP (1) | EP0361350B1 (en) |
| JP (1) | JP2805767B2 (en) |
| KR (1) | KR930010170B1 (en) |
| CA (1) | CA1306013C (en) |
| DE (1) | DE68924027T2 (en) |
Families Citing this family (69)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR920001543B1 (en) * | 1988-02-29 | 1992-02-18 | 가부시끼가이샤 도시바 | Radio telecommunication apparatus |
| US7606575B2 (en) * | 1988-08-04 | 2009-10-20 | Broadcom Corporation | Remote radio data communication system with data rate switching |
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| JPS5966231A (en) * | 1982-10-08 | 1984-04-14 | Nec Corp | Battery saving system |
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| JPS62199133A (en) * | 1986-02-27 | 1987-09-02 | Nec Corp | Automobile telephone connection system |
| JP2516983B2 (en) * | 1987-06-19 | 1996-07-24 | 松下通信工業株式会社 | Wireless telephone equipment |
-
1988
- 1988-09-26 JP JP63241486A patent/JP2805767B2/en not_active Expired - Fee Related
-
1989
- 1989-09-22 CA CA000612469A patent/CA1306013C/en not_active Expired - Lifetime
- 1989-09-25 EP EP89117638A patent/EP0361350B1/en not_active Expired - Lifetime
- 1989-09-25 KR KR1019890013738A patent/KR930010170B1/en not_active IP Right Cessation
- 1989-09-25 DE DE68924027T patent/DE68924027T2/en not_active Expired - Fee Related
- 1989-09-26 US US07/412,378 patent/US5031231A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| KR900005718A (en) | 1990-04-14 |
| DE68924027D1 (en) | 1995-10-05 |
| JPH0287834A (en) | 1990-03-28 |
| EP0361350A2 (en) | 1990-04-04 |
| EP0361350A3 (en) | 1991-12-11 |
| US5031231A (en) | 1991-07-09 |
| EP0361350B1 (en) | 1995-08-30 |
| DE68924027T2 (en) | 1996-01-25 |
| JP2805767B2 (en) | 1998-09-30 |
| KR930010170B1 (en) | 1993-10-15 |
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| MKLA | Lapsed | ||
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