CA2035204C - Cellular mobile telephone system - Google Patents
Cellular mobile telephone systemInfo
- Publication number
- CA2035204C CA2035204C CA002035204A CA2035204A CA2035204C CA 2035204 C CA2035204 C CA 2035204C CA 002035204 A CA002035204 A CA 002035204A CA 2035204 A CA2035204 A CA 2035204A CA 2035204 C CA2035204 C CA 2035204C
- Authority
- CA
- Canada
- Prior art keywords
- channel
- standby
- channels
- mobile station
- call
- 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 - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
Abstract
In a cellular mobile telephone system serving a plurality of cells, each of the cells being assigned a unique standby channel, the mobile station is assigned several standby channels and a system identifier identifying the system. The standby channels are scanned and one of the scanned channels having a highest signal level is selected. If there is a match between the system identifier of the selected standby channel and the system identifier of the mobile station, the mobile station is ready to originate or receive a call. If there is no originating or incoming terminating call, the identifier of a call setup channel specified by the standby channel is stored into a different location of a memory.
Otherwise, the identifiers stored in the memory are scanned, and one of the scanned call setup channels is selected.
Otherwise, the identifiers stored in the memory are scanned, and one of the scanned call setup channels is selected.
Description
2n~5204 , TITLE OF THE INVENTION
2 "Cellular Mobile Telephone Systemn -~
4 The present invention relates generally to cellular mobile telephone 5 systems, and more specifically to a channel selection technique for 6 selecting a control channel during call setup periods.
7 According to the EIA or TACS cellular mobile telephone system, 8 idle mobile stations are normally tuned to an assigned 'standby channel 9 to receive identifiers of call setup channels specified by the standby 10 channel. When originating or receiving a call, the mobile station detects 11 the signal levels of the specified call setup channels and selects one 12 having the highest signal level and transmits a call-request signal or 13 returns an answer signal over the selected channel.
14 Recent demands for mobile telephone systems have given rise to 15 the establishment of similar mobile telephone systems by different 16 common carriers, using the frequency reuse scheme. However, in some 17 fringe areas, an undesirable situation can occur in which a certain 8 frequency band is shared between adjacent cells served by different ~e~e~
19 common carriers. Mobile station is constantly r~coiviving call setup channel idcntificrs specified by the strongest standby channel of the 21 own system. If the up-direction call setup channel that is paired with the 22 strongest down-direction call setup channel is shared with the 23 subscribers of a different common carrier in an adjacent cell, the signal 24 levels of the different common carrier may, in some cases, be stronger than those of the own signal. If a call is attempted under such 2 6 circumstances, it is likely that the 'mobile station will seize a call setup 27 channel of the different common carrier.
.
SUMMARY OF THE INVENTION
It ls therefore an ob~ect of the present lnventlon to reduce the llkellhood of a moblle statlon selectlng undeslred control channels.
Accordlng to one aspect of the present lnventlon, there ls provlded a method for selectlng channels ln a moblle statlon for a cellular moblle telephone system servlng a plurallty of cells, each of the cells belng asslgned a unlque standby channel contalnlng a system ldentlfler ldentlfylng sald system, and sald moblle statlon ls asslgned a plurallty of standby channels and sald system ldentlfler, the method comprlslng:
a) scannlng sald standby channels to detect slgnal levels and selectlng one of the scanned standby channels havlng a hlghest slgnal level;
b) detectlng whether there ls a match between a system ldentlfler contalned ln the selected standby channel and the system ldentlfler of sald moblle statlon;
c) lf sald match ls detected, detectlng whether there ls an orlglnatlng call from or an lncomlng call to the moblle statlon;
d) lf there ls no orlglnatlng or lncomlng call detected by the step (c), storlng a channel number of a call setup channel speclfled by the selected standby channel lnto a successlve locatlon of a memory;
e) repeatlng the steps la) to (d); and f) lf there ls an orlglnatlng or lncomlng call detected by the step (c), selectlng one of the call setup channels stored ln sald memory.
. ~J ~
2035~04 - 2a - 71024-150 Accordlng to another aspect, the present lnventlon provldes a moblle statlon for a cellular moblle telephone system servlng a plurallty of cells, each of the cells belng asslgned a unlque standby channel contalnlng a system ldentlfler ldentlfylng sald system, and sald moblle station ls asslgned a plurallty of standby channels and sald system ldentlfler, the method comprlslng:
a tunable radlo-frequency transcelver; and a channel controller coupled to sald transcelver for causlng sald transcelver to tune to one of the standby channels havlng a hlghest slgnal level, detectlng a match between a system ldentlfler contalned ln the selected standby channel and the system ldentlfler of sald moblle statlon, detectlng whether there is an orlglnatlng call from or a lncomlng call to the moblle station, storlng a channel number of a call setup channel speclfled by the selected standby channel lnto a dlfferent locatlon of a memory ln response to the absence of sald orlglnatlng or lncomlng call, and selectlng one of the stored channel numbers ln response to the presence of sald orlglnatlng or lncomlng call, and causlng sald transcelver to tune to one of the call setup channels havlng sald selected channel number.
~RIEF DESCRIPTION OF THE DRAWINGS
The present lnventlon wlll be descrlbed ln further detall wlth reference to the accompanylng drawlngs, ln whlch:
Flg. 1 ls a block dlagram of a block dlagram of a cellular moblle unlt accordlng to the present lnventlon;
,.~
.. ~..,.. ~
- 2b - 71024-150 Flg. 2 is a flowchart descrlblng the lnstructlons performed by the controller of Flg. 1 accordlng to an embodlment of thls lnventlon;
Flg. 3 ls a flowchart lllustratlng a modifled embodlment of Flg. 2; and Flg. 4A and 4B are flowcharts descrlblng the controller lnstructlons .~
according to a further modification of this invention.
2 DETAILED DESCRIPTION -~
3 Referring now to Fig. 1, there is shown a mobile telephone station 4 embodying the present invention for a cellular mobile telephone system covering a plurality of service zones, or cells each being assigned a 6 unique standby control channel. The standby channel is a down-7 direction (from the base station to mobile stations) channel and contains 8 information specifying a number of two-way call setup channels. These 9 control channels occupy a band of frequencies adjacent to a band of speech channels within the allocated frequency spectrum. The mobile 1 station is assigned a plurality of different standby channels.
12 RF signal from a cell site is received by an antenna 1 and passed 13 through a duplexer 2 to a mixer 3 where it is converted to a first 14 intermediate frequency with a local carrier generated by a frequency synthesizer 4. After passing through an amplifier 5, the mixer 3 output 16 is converted to a second intermediate frequency by a mixer 6 using a 17 local carrier from an oscillator 7. The output of mixer 6 is passed 18 through an amplifier 8 and applied to a discriminator 9 in which the 19 original digital signal is recovered. A decoder 10 is coupled to discriminator 9 to supply decoded signals to a channel controller 11.
21 On the other hand, coded transmit signal is supplied from an 22 encoder 12 to a mixer 13 in which it is converted to radio frequency 23 with a local carrier supplied from a frequency synthesizer 14 for 24 transmission to a cell site. Frequency synthesizers 4 and 14 are controlled by channel controller 11. A memory 15 is connected to 2 6 controller 15 to store channel selection data in a manner as will be 27 described below.
28 Channel controller 11 is programmed to perform instructions 2o352~4 descrlbed ln Figs. 2, 3 4A and 4B. In Flg. 2, the program executlon starts wlth an lnltlallzatlon step 21 ln whlch a varlable K ls reset to zero. Exlt then ls to second lnltlallzatlon step 22 ln whlch flags FR and Fo are reset to zero. ~xlt then ls to operatlons step 23 whlch dlrects the scannlng of standby channels asslgned to the moblle statlon by sweeplng the frequency of the local carrler of recelve frequency syntheslzer 4. The slgnal level of each scanned channel ls detected and recorded.
Control exlts to step 24 to select one of the scanned standby channels havlng the hlghest slgnal level. Exlt then ls to declslon step 25 whlch checks to see lf there ls a match between the system ldentlfler of the selected standby channel and that of the moblle statlon. If the answer ls negatlve, control returns to step 22, and lf lt ls afflrmatlve, exlt ls to declslon step 26 to check to see lf a rlnglng slgnal ls recelved. If the answer ls negatlve, control moves to declslon step 27 to check to see lf there ls an off-hook condltlon. If there ls none, control proceeds to declslon step 28 to determlne lf there ls a match between the call setup channel number of the selected standby channel and a channel number most recently stored ln memory 15. If a match ls detected, control returns to step 25 to repeat the process. If a mlsmatch ls detected, control advances to operatlons step 29 to store the channel number of a call setup channel speclf led by the selected standby channel lnto a locatlon K of memory 15. Varlable K ls lncremented by 1 (step 30) and checked agalnst a maxlmum value representlng the capaclty of memory 15 ~step 31). If the answer ls negatlve, control returns to step 25 and lf afflrmatlve, lt returns to step 21 to reset the varlable K to zero agaln. As ~0 control loops through steps 22 to 31 whlle drlvlng the vehlcle, the channel numbers of call setup channels speclfled by multlple standby channels wlll be stored ln several locatlons of memory 15.
If a call ls recelved from the base statlon, the answer ln step 26 becomes afflrmatlve and flag FR ls set equal to 1 (step 32) or a call ls orlginated from the moblle statlon, the answer ln step 27 becomes afflrmatlve and flag Fo ls set equal to 1 (step 33). Control exlts to operatlon step 34 to scan all channel numbers stored ln memory 15 by sweeplng the frequency of the syntheslzer 4 to tune the moblle recelver successlvely to the call setup channels havlng the channel numbers stored ln the memory.
The slgnal levels of these call setup channels are detected and recorded. Exlt then ls to step 35 to select one of the call setup channels havlng the hlghest slgnal level.
Exlt then ls to step 36 to check to see whlch of flag FR
or Fo ls set equal to 1. If FR = 1, step 37 ls executed by returnlng an answer slgnal over the selected call setup channel to establlsh a rlnglng connectlon, and lf Fo = 1, step 38 ls executed by sendlng a call request slgnal over the selected call setup channel to establlsh a dlallng connectlon.
A modlfled embodlment of thls lnventlon ls shown ln Flg.3 whlch dlffers from the Flg. 2 embodlment ln that operatlons steps 34 and 35 of Flg. 2 are replaced wlth operatlons step 40.
Followlng the executlon of step 32 or 33, control exlts to step 40 to select the call setup channel whose channel number ls most recently stored lnto memory locatlon K. Frequency syntheslzers 4 and 14 are controlled so that the moblle statlon ls tuned to the selected call setup channel.
. ~-Flgs. 4A and 4B are flowcharts of a further modiflcatlon of the present lnventlon. In Flg. 4A, followlng the negatlve declslon of step 31, control goes to operatlons step 41 (Flg. 4B) to transfer all channel numbers stored ln memory locatlons K to memory locatlons L. Step 42 ls followed by declslon step 42 whlch checks to see lf the contents of memory locatlons L are sufflclent to make a statistlcal analysls. If the answer ls afflrmatlve, exlt ls to operatlons step 43 ln whlch the channel numbers stored ln locatlons L are sorted accordlng to dlfferent channels. Exlt then ls to operatlons step 44 ln whlch the same channel numbers are counted. Control moves to step 45 to detect a maxlmum count value and store the channel number of the maxlmum count lnto a memory locatlon M (step 46).
In Flg. 4A, operatlons steps 34 and 35 of Flg. 2 are replaced wlth step 47 ln whlch the call setup channel of the ldentlfler stored ln memory locatlon M ls selected, and the frequency syntheslzers 4 and 14 are controlled to tune the moblle statlon to the selected call setup channel.
The foregolng descrlptlon shows only preferred embodlments of the present lnventlon. Varlous modlflcatlons are apparent to those skllled ln the art wlthout departlng from the scope of the present lnventlon whlch ls only llmlted by the appended clalms. For example, lf memory 15 ls lmplemented wlth a flrst-ln-flrst-out (FIFO), steps 21, 30 and 31 could be dlspensed wlth. Furthermore, two-way channels could also be used for standby channels as well as for call-setup channels.
19 common carriers. Mobile station is constantly r~coiviving call setup channel idcntificrs specified by the strongest standby channel of the 21 own system. If the up-direction call setup channel that is paired with the 22 strongest down-direction call setup channel is shared with the 23 subscribers of a different common carrier in an adjacent cell, the signal 24 levels of the different common carrier may, in some cases, be stronger than those of the own signal. If a call is attempted under such 2 6 circumstances, it is likely that the 'mobile station will seize a call setup 27 channel of the different common carrier.
.
SUMMARY OF THE INVENTION
It ls therefore an ob~ect of the present lnventlon to reduce the llkellhood of a moblle statlon selectlng undeslred control channels.
Accordlng to one aspect of the present lnventlon, there ls provlded a method for selectlng channels ln a moblle statlon for a cellular moblle telephone system servlng a plurallty of cells, each of the cells belng asslgned a unlque standby channel contalnlng a system ldentlfler ldentlfylng sald system, and sald moblle statlon ls asslgned a plurallty of standby channels and sald system ldentlfler, the method comprlslng:
a) scannlng sald standby channels to detect slgnal levels and selectlng one of the scanned standby channels havlng a hlghest slgnal level;
b) detectlng whether there ls a match between a system ldentlfler contalned ln the selected standby channel and the system ldentlfler of sald moblle statlon;
c) lf sald match ls detected, detectlng whether there ls an orlglnatlng call from or an lncomlng call to the moblle statlon;
d) lf there ls no orlglnatlng or lncomlng call detected by the step (c), storlng a channel number of a call setup channel speclfled by the selected standby channel lnto a successlve locatlon of a memory;
e) repeatlng the steps la) to (d); and f) lf there ls an orlglnatlng or lncomlng call detected by the step (c), selectlng one of the call setup channels stored ln sald memory.
. ~J ~
2035~04 - 2a - 71024-150 Accordlng to another aspect, the present lnventlon provldes a moblle statlon for a cellular moblle telephone system servlng a plurallty of cells, each of the cells belng asslgned a unlque standby channel contalnlng a system ldentlfler ldentlfylng sald system, and sald moblle station ls asslgned a plurallty of standby channels and sald system ldentlfler, the method comprlslng:
a tunable radlo-frequency transcelver; and a channel controller coupled to sald transcelver for causlng sald transcelver to tune to one of the standby channels havlng a hlghest slgnal level, detectlng a match between a system ldentlfler contalned ln the selected standby channel and the system ldentlfler of sald moblle statlon, detectlng whether there is an orlglnatlng call from or a lncomlng call to the moblle station, storlng a channel number of a call setup channel speclfled by the selected standby channel lnto a dlfferent locatlon of a memory ln response to the absence of sald orlglnatlng or lncomlng call, and selectlng one of the stored channel numbers ln response to the presence of sald orlglnatlng or lncomlng call, and causlng sald transcelver to tune to one of the call setup channels havlng sald selected channel number.
~RIEF DESCRIPTION OF THE DRAWINGS
The present lnventlon wlll be descrlbed ln further detall wlth reference to the accompanylng drawlngs, ln whlch:
Flg. 1 ls a block dlagram of a block dlagram of a cellular moblle unlt accordlng to the present lnventlon;
,.~
.. ~..,.. ~
- 2b - 71024-150 Flg. 2 is a flowchart descrlblng the lnstructlons performed by the controller of Flg. 1 accordlng to an embodlment of thls lnventlon;
Flg. 3 ls a flowchart lllustratlng a modifled embodlment of Flg. 2; and Flg. 4A and 4B are flowcharts descrlblng the controller lnstructlons .~
according to a further modification of this invention.
2 DETAILED DESCRIPTION -~
3 Referring now to Fig. 1, there is shown a mobile telephone station 4 embodying the present invention for a cellular mobile telephone system covering a plurality of service zones, or cells each being assigned a 6 unique standby control channel. The standby channel is a down-7 direction (from the base station to mobile stations) channel and contains 8 information specifying a number of two-way call setup channels. These 9 control channels occupy a band of frequencies adjacent to a band of speech channels within the allocated frequency spectrum. The mobile 1 station is assigned a plurality of different standby channels.
12 RF signal from a cell site is received by an antenna 1 and passed 13 through a duplexer 2 to a mixer 3 where it is converted to a first 14 intermediate frequency with a local carrier generated by a frequency synthesizer 4. After passing through an amplifier 5, the mixer 3 output 16 is converted to a second intermediate frequency by a mixer 6 using a 17 local carrier from an oscillator 7. The output of mixer 6 is passed 18 through an amplifier 8 and applied to a discriminator 9 in which the 19 original digital signal is recovered. A decoder 10 is coupled to discriminator 9 to supply decoded signals to a channel controller 11.
21 On the other hand, coded transmit signal is supplied from an 22 encoder 12 to a mixer 13 in which it is converted to radio frequency 23 with a local carrier supplied from a frequency synthesizer 14 for 24 transmission to a cell site. Frequency synthesizers 4 and 14 are controlled by channel controller 11. A memory 15 is connected to 2 6 controller 15 to store channel selection data in a manner as will be 27 described below.
28 Channel controller 11 is programmed to perform instructions 2o352~4 descrlbed ln Figs. 2, 3 4A and 4B. In Flg. 2, the program executlon starts wlth an lnltlallzatlon step 21 ln whlch a varlable K ls reset to zero. Exlt then ls to second lnltlallzatlon step 22 ln whlch flags FR and Fo are reset to zero. ~xlt then ls to operatlons step 23 whlch dlrects the scannlng of standby channels asslgned to the moblle statlon by sweeplng the frequency of the local carrler of recelve frequency syntheslzer 4. The slgnal level of each scanned channel ls detected and recorded.
Control exlts to step 24 to select one of the scanned standby channels havlng the hlghest slgnal level. Exlt then ls to declslon step 25 whlch checks to see lf there ls a match between the system ldentlfler of the selected standby channel and that of the moblle statlon. If the answer ls negatlve, control returns to step 22, and lf lt ls afflrmatlve, exlt ls to declslon step 26 to check to see lf a rlnglng slgnal ls recelved. If the answer ls negatlve, control moves to declslon step 27 to check to see lf there ls an off-hook condltlon. If there ls none, control proceeds to declslon step 28 to determlne lf there ls a match between the call setup channel number of the selected standby channel and a channel number most recently stored ln memory 15. If a match ls detected, control returns to step 25 to repeat the process. If a mlsmatch ls detected, control advances to operatlons step 29 to store the channel number of a call setup channel speclf led by the selected standby channel lnto a locatlon K of memory 15. Varlable K ls lncremented by 1 (step 30) and checked agalnst a maxlmum value representlng the capaclty of memory 15 ~step 31). If the answer ls negatlve, control returns to step 25 and lf afflrmatlve, lt returns to step 21 to reset the varlable K to zero agaln. As ~0 control loops through steps 22 to 31 whlle drlvlng the vehlcle, the channel numbers of call setup channels speclfled by multlple standby channels wlll be stored ln several locatlons of memory 15.
If a call ls recelved from the base statlon, the answer ln step 26 becomes afflrmatlve and flag FR ls set equal to 1 (step 32) or a call ls orlginated from the moblle statlon, the answer ln step 27 becomes afflrmatlve and flag Fo ls set equal to 1 (step 33). Control exlts to operatlon step 34 to scan all channel numbers stored ln memory 15 by sweeplng the frequency of the syntheslzer 4 to tune the moblle recelver successlvely to the call setup channels havlng the channel numbers stored ln the memory.
The slgnal levels of these call setup channels are detected and recorded. Exlt then ls to step 35 to select one of the call setup channels havlng the hlghest slgnal level.
Exlt then ls to step 36 to check to see whlch of flag FR
or Fo ls set equal to 1. If FR = 1, step 37 ls executed by returnlng an answer slgnal over the selected call setup channel to establlsh a rlnglng connectlon, and lf Fo = 1, step 38 ls executed by sendlng a call request slgnal over the selected call setup channel to establlsh a dlallng connectlon.
A modlfled embodlment of thls lnventlon ls shown ln Flg.3 whlch dlffers from the Flg. 2 embodlment ln that operatlons steps 34 and 35 of Flg. 2 are replaced wlth operatlons step 40.
Followlng the executlon of step 32 or 33, control exlts to step 40 to select the call setup channel whose channel number ls most recently stored lnto memory locatlon K. Frequency syntheslzers 4 and 14 are controlled so that the moblle statlon ls tuned to the selected call setup channel.
. ~-Flgs. 4A and 4B are flowcharts of a further modiflcatlon of the present lnventlon. In Flg. 4A, followlng the negatlve declslon of step 31, control goes to operatlons step 41 (Flg. 4B) to transfer all channel numbers stored ln memory locatlons K to memory locatlons L. Step 42 ls followed by declslon step 42 whlch checks to see lf the contents of memory locatlons L are sufflclent to make a statistlcal analysls. If the answer ls afflrmatlve, exlt ls to operatlons step 43 ln whlch the channel numbers stored ln locatlons L are sorted accordlng to dlfferent channels. Exlt then ls to operatlons step 44 ln whlch the same channel numbers are counted. Control moves to step 45 to detect a maxlmum count value and store the channel number of the maxlmum count lnto a memory locatlon M (step 46).
In Flg. 4A, operatlons steps 34 and 35 of Flg. 2 are replaced wlth step 47 ln whlch the call setup channel of the ldentlfler stored ln memory locatlon M ls selected, and the frequency syntheslzers 4 and 14 are controlled to tune the moblle statlon to the selected call setup channel.
The foregolng descrlptlon shows only preferred embodlments of the present lnventlon. Varlous modlflcatlons are apparent to those skllled ln the art wlthout departlng from the scope of the present lnventlon whlch ls only llmlted by the appended clalms. For example, lf memory 15 ls lmplemented wlth a flrst-ln-flrst-out (FIFO), steps 21, 30 and 31 could be dlspensed wlth. Furthermore, two-way channels could also be used for standby channels as well as for call-setup channels.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for selecting channels in a mobile station for a cellular mobile telephone system serving a plurality of cells, each of the cells being assigned a unique standby channel containing a system identifier identifying said system, and said mobile station is assigned a plurality of standby channels and said system identifier the method comprising:
a) scanning said standby channels to detect signal levels and selecting one of the scanned standby channels having a highest signal level;
b) detecting whether there is a match between a system identifier contained in the selected standby channel and the system identifier of said mobile station;
c) if said match is detected, detecting whether there is an originating call from or an incoming call to the mobile station;
d) if there is no originating or incoming call detected by the step (c), storing a channel number of a call setup channel specified by the selected standby channel into a successive location of a memory;
e) repeating the steps (a) to (d); and f) if there is an originating or incoming call detected by the step (c), selecting one of the call setup channels stored in said memory.
a) scanning said standby channels to detect signal levels and selecting one of the scanned standby channels having a highest signal level;
b) detecting whether there is a match between a system identifier contained in the selected standby channel and the system identifier of said mobile station;
c) if said match is detected, detecting whether there is an originating call from or an incoming call to the mobile station;
d) if there is no originating or incoming call detected by the step (c), storing a channel number of a call setup channel specified by the selected standby channel into a successive location of a memory;
e) repeating the steps (a) to (d); and f) if there is an originating or incoming call detected by the step (c), selecting one of the call setup channels stored in said memory.
2. A method as claimed in claim 1, wherein the call setup channel selected by the step (f) has a highest signal level.
3. A method as claimed in claim 1, wherein the identifier of the call setup channel selected by the step (f) is a most recently stored channel number among the channel numbers stored in said memory.
4. A method as claimed in claim 1, wherein the channel number of the call setup channel selected by the step (f) is a most frequently stored channel number of those stored in said memory.
5. A mobile station for a cellular mobile telephone system serving a plurality of cells, each of the cells being assigned a unique standby channel containing a system identifier identifying said system, and said mobile station is assigned a plurality of standby channels and said system identifier the method comprising:
a tunable radio-frequency transceiver; and a channel controller coupled to said transceiver for causing said transceiver to tune to one of the standby channels having a highest signal level, detecting a match between a system identifier contained in the selected standby channel and the system identifier of said mobile station, detecting whether there is an originating call from or a incoming call to the mobile station, storing a channel number of a call setup channel specified by the selected standby channel into a different location of a memory in response to the absence of said originating or incoming-call, and selecting one of the stored channel numbers in response to the presence of said originating or incoming call, and causing said transceiver to tune to one of the call setup channels having said selected channel number.
a tunable radio-frequency transceiver; and a channel controller coupled to said transceiver for causing said transceiver to tune to one of the standby channels having a highest signal level, detecting a match between a system identifier contained in the selected standby channel and the system identifier of said mobile station, detecting whether there is an originating call from or a incoming call to the mobile station, storing a channel number of a call setup channel specified by the selected standby channel into a different location of a memory in response to the absence of said originating or incoming-call, and selecting one of the stored channel numbers in response to the presence of said originating or incoming call, and causing said transceiver to tune to one of the call setup channels having said selected channel number.
6. A mobile station as claimed in claim 5, wherein the tuned call setup channel has a highest signal level among the call setup channels whose channel numbers are stored in said memory.
7. A mobile station as claimed in claim 5, wherein the channel number of the tuned call setup channel is a most recently stored channel number among the channel numbers stored in said memory.
8. A mobile station as claimed in claim 5, wherein the channel number of the tuned call setup channel is a most frequently stored channel number of those stored in said memory.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020328A JP2867538B2 (en) | 1990-01-30 | 1990-01-30 | Channel selection method |
| JP2-20328 | 1990-01-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2035204C true CA2035204C (en) | 1994-11-15 |
Family
ID=12024069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002035204A Expired - Fee Related CA2035204C (en) | 1990-01-30 | 1991-01-29 | Cellular mobile telephone system |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5257400A (en) |
| EP (1) | EP0440436B1 (en) |
| JP (1) | JP2867538B2 (en) |
| AU (1) | AU630782B2 (en) |
| CA (1) | CA2035204C (en) |
| HK (1) | HK85597A (en) |
Families Citing this family (35)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2809872B2 (en) * | 1990-11-29 | 1998-10-15 | 松下電器産業株式会社 | Mobile communication device |
| JP2692418B2 (en) * | 1991-05-17 | 1997-12-17 | 日本電気株式会社 | Radio channel allocation method |
| JP2832096B2 (en) * | 1991-06-10 | 1998-12-02 | キヤノン株式会社 | Communication control device |
| US5842129A (en) * | 1991-10-11 | 1998-11-24 | Matsushita Electric Industrial Co., Ltd. | Portable radio telephone equipment used for CMTS/MCS in common |
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-
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- 1990-01-30 JP JP2020328A patent/JP2867538B2/en not_active Expired - Lifetime
-
1991
- 1991-01-29 CA CA002035204A patent/CA2035204C/en not_active Expired - Fee Related
- 1991-01-30 EP EP91300697A patent/EP0440436B1/en not_active Expired - Lifetime
- 1991-01-30 AU AU70122/91A patent/AU630782B2/en not_active Ceased
- 1991-01-30 US US07/647,792 patent/US5257400A/en not_active Expired - Lifetime
-
1997
- 1997-06-19 HK HK85597A patent/HK85597A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| HK85597A (en) | 1997-06-27 |
| AU630782B2 (en) | 1992-11-05 |
| JP2867538B2 (en) | 1999-03-08 |
| EP0440436B1 (en) | 1995-11-08 |
| EP0440436A3 (en) | 1992-06-03 |
| AU7012291A (en) | 1991-08-01 |
| EP0440436A2 (en) | 1991-08-07 |
| US5257400A (en) | 1993-10-26 |
| JPH03226032A (en) | 1991-10-07 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 20000131 |