CA1298002C - Paging system - Google Patents
Paging systemInfo
- Publication number
- CA1298002C CA1298002C CA000560403A CA560403A CA1298002C CA 1298002 C CA1298002 C CA 1298002C CA 000560403 A CA000560403 A CA 000560403A CA 560403 A CA560403 A CA 560403A CA 1298002 C CA1298002 C CA 1298002C
- Authority
- CA
- Canada
- Prior art keywords
- signals
- paging
- predetermined number
- pager identification
- pager
- 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
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/022—One-way selective calling networks, e.g. wide area paging
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
- H04M11/022—Paging systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/50—Centralised arrangements for answering calls; Centralised arrangements for recording messages for absent or busy subscribers ; Centralised arrangements for recording messages
- H04M3/53—Centralised arrangements for recording incoming messages, i.e. mailbox systems
- H04M3/533—Voice mail systems
Abstract
ABSTRACT OF THE DISCLOSURE
A paging system comprises a predetermined number of radio paging terminals each producing a subscriber identification number, a service zone signal, and a frequency signal respectively corresponding to a subscriber number, a paging processor for allocating subscriber identification numbers received from the radio paging terminals respectively to a predetermined number of paging service zones and a predetermined number of time slots in accordance with the service zone signals and frequency signals, and a predetermined number of transmitter for radiating paging signals provided in each of the paging service zones so that at least two paging signals having different frequencies which are obtained by modulating at least two of the subscriber identification numbers are radiated in two adjacent paging service zones at one of the time slots.
A paging system comprises a predetermined number of radio paging terminals each producing a subscriber identification number, a service zone signal, and a frequency signal respectively corresponding to a subscriber number, a paging processor for allocating subscriber identification numbers received from the radio paging terminals respectively to a predetermined number of paging service zones and a predetermined number of time slots in accordance with the service zone signals and frequency signals, and a predetermined number of transmitter for radiating paging signals provided in each of the paging service zones so that at least two paging signals having different frequencies which are obtained by modulating at least two of the subscriber identification numbers are radiated in two adjacent paging service zones at one of the time slots.
Description
)2 A PAGING SYSTEM
FIELD OF l'HE INVENTION
The invention relates to a paging system, and more particularly to a paging system in which calling signals of the same paging signal frequency can be used in more than two service zones.
BACKGROUND OF THE INVENTION
One of conventional paging systems comprises a plurality of apparatus each producing a paging signal in accordance with a calling signal which is received from a corresponding public switching telephone network. For instance, one of the apparatus covers a nation-wide service zone, and each of the remaining apparatus covers a corresponding one of local service zones. In each of the service zones, a paging signal is radiated from a plurality of antennas of the apparatus so that one of pager receivers each having a fixed receiving signal frequency can receive the paging signal.
According to the conventional paging system, however, frequencies of paging signals for the nation-wide service zone must be different from those of paging signals for the local service zones, and the same allocation of frequencies must be performed in two adjacent local service zones having an overlapping service area for the reason why a phasing of those .
paging signals can not be performed in the service zones. Further, a pager receiver must be replaced by one having another fixed receiving signal freguency in a case where a service zone is changed for a subscriber. As a result, an effective utilization of frequencies can not be realized in the conventional paging system.
SUMMARY O~ THE INVENTION
Accordingly, it is an object of the invention to provide a paging system in which the same paging signal frequency can be used in more -than two service zones having an overlapping service area.
It is a further objec-t of the invention to provide a paging system in which a pager receiver can be used in more -than two service zones.
It is a still further object of the invention to provide a paging system in which an effective utilization of frequencies can be realized.
According~to the invention, a paging system comprises, a predetermined number of radio paging terminals each having a subscriber file in which subscriber numbers, service zone informations and frequency informations are stored, each of said radio paging terminals produces a pager identification number, a service zone signal, and a frequency signal respectively corresponding to a subscriber number when each of said radio paging terminals finds said 0~2 subscriber number to be registered in said subscriber fi.le, a paging processor in which a queing of pager identification numbers received from said predetermined number of said radio paging terminals is performed in accordance with service zone signals further received therefrom so that said pager identification numbers are allocated to respective designated service zones, said pager identification numbers in each of said respec-tive designated service zones are further allocated to a predetermined number of time slots in accordance with frequency signals still further received from said predetermined number of said radio paging -terminals, said pager identification numbers thus allocated in regard to said service zone and frequency signals are encoded to produce pager identification number signals, and channel designating signals are added to said pager identification number signals in accordance with said : frequency signals, a predetermined number of expanders each : dividing said pager identification number signals having said channel identification signals in each of paging service zones into a predetermined number of said pager identification number signals, and a predetermined number of transmitters which are provided in said each of said paging service zones, ; each of said predetermined number of said transmitters ~L~ 02 radiating one of said pager identification nurnber signals in a Erequency designa-ted by one of said channel designa-ting signals, wherein said predetermined number of said time slots are synchronized among said paging service zones, and at least two of said pager iden-tification number signals are radlated with different frequencies in two adjacen-t paging service zones at one o~ said time slots.
RRIEF DESCRIPTION OF TIIE DRAWINGS
The invention will be explained in more detail in conjunction with following drawings wherein, Fig. 1 is an explanatory diagram showing a nation-wide service zone and local service zones, Fig. 2 is a block diagram showing a paging system in an embodiment according to the invention, Fig. 3 is a block diagram showing a radio paging terminal in the embodiment in Fig. 2, Figs. 4A to 4C are explanatory diagrams showing subscriber files in the radio paging terminals in Fig.
3, Fig. 5 is a block diagram showing a paging processor in the embodiment in Fig. 2, Fig. 6 is a block diagram showing an expander in the embodiment in Fig. 2, Fig. 7 is a block diagram showing a transmitter in the embodiment in Fig. 2, Figs. 8A and 8B are explanatory dlagrams showing s an oper~tion of the embodiment and a paging signal therein~
DESCRIPTION OF A PREFERRED EMBODIMENT
... .
Fig. 1 shows four service zones 0 to 3 which are covered by a paging system. I'he service zone 0 is of a nation-wide service zone, and the service zones 1 to 3 are of local service zones having overlapping service areas indicated by hatchings. In the conventional paging system as explained before, therefore, frequencies of paging signals must be different in the four service zones 0 to 3 from others because a phasing of -those paging signals can not be peformed therein.
Fig. 2 shows a paging system in an embodiment according to the invention. The paging system comprises 15 radio paging terminals 100, 110 and 120 respectively connected to public switching telephone networks 10, 11 and 12 thereby to receive calling signals from telephone sets, a paging processor 200 for queing pager identification numbers received from the radio paging 20 terminals 100, 110 and 120 in each of local se_vice zones 1 to 3 in accordance with service zone informations further received therefrom and for encoding the pager identification numbers allocated sequentially by frequency informations s-till further received therefrom to produce pager identification number signals, expanders 300, 310 and 320 respectively positioned in the local service zones 1 to 3 for dividing the pager identification nurnber signals by the number of transmi-tters, and transm:itters 400, 410 and 420, 430, 440 and 450, and 460, 470 and 480 respectively connected to the expanders 300, 310 and 320 in the local servi.ce zones 1 to 3 for modulating the pager identification number signals -to radiate paging signals.
Fig. 3 shows one of the radio paging terminals 100, 110 and 120 which comprises input trunk interfaces 10 101, 102 and 103 for receiving subscriber numbers from a corresponding one of the public switching telephone networks 10, 11 and 12, a central processing unit 104 having subscriber files to be described later, and a data output interface 105 through which informations of 15 pager identification numbers, service zones and fre-quencies are supplied to the paging processor 200.
Figs. 4A to 4C show the subscriber files contained in the central processing units 104 of the radio paging terminals 100, 110 and 120. In the subscriber files, symbols o , ~.and (`~ ~ 1''1 and ~ , :and ~ and ~ indicate subscriber numbers wherein the symbols O , O , and ~ designate all of the local service zones 1 to 3 (Zl to Z3), the symbol C~
designates two of the local service zones 1 and 2 (Zl and Z2 ), and the symbols ~ , ~ and ~
designate one of the local service zones 1 to 3, that is, is the local service zone 1(Zl), L,l is the local service zone 2(Z2), and ~ is -the local service zone ~913002 3(Z3). Frequencies of the paging signals are indicated in the subscriber files by "fl", "f2" and "f3"
which correspond to channels CH1 to CH3.
The subscriber files further include pager identification numbers corresponding to the subscriber numbers wherein the subscriber numbers are converted into the pager identification number in the central processing units 104. In the embodiment to be described hereinafter, the pager identification numbers are identical in regard to number to the subscriber numbers and also indicated by the same symbols as described above.
Fig. 5 shows the paging processor 200 which comprises data input interfaces 201, 202 and 203 through which the informations stored in the subscriber files shown in Figs. 4A to 4C are received therein, a central processing unit 204 for queing pager ~` identification numbers in each of -the local service zones 1 to 3 in accordance with the local service zone informations Zl to Z3, and encoders 205, 206 and 207 for encoding the pager identification numbers allocated sequentially by the frequency informations f1, f2 and f3 to produce pager identification number signals of a sequential order CH1, CH2 and CH3 for the ~25 local service zone 1, a sequential order CH3, CH1 and CH2 for the local service zone 2, and a sequential order CH2, CH3 and CH1 for the local service zone 3.
: .
~ ig. 6 shows one of -the expanders 300, 310 and 320 respectively positioned in the local service zones 1 to 3 which comprises an input line interface 301 through which the pager identification number signals are received therein, and output line interfaces 302, 303 and 304 each having a fixed delaying circuit for a phasing of the pager identification number signals, and through which distribu-ted pager identification number signals are supplied to the transmitters 400, 410 and 10 420, 430, 440 and 450, and 460, 470 and 480.
Fig. 7 shows one of the transmitters in the local service zones 1 to 3 which comprises an input line interface 401 through which one of the distributed pager identification number signals is received therein, a down signal supervisory circuit 402 for selecting one of channels CH1 to CH3 in accordance with channel designating signals/ modulators 403, 404 and 405 for producing CH1 to CH3 paging signals and one of which is selected by the down signal supervisory 20 circuit 402, a power amplifier 406 for amplifying one of the modulated paging signals, and an antenna 407 for radiating the paging signals to be received by pager receivers.
In opera-tion, a subscriber makes a telephone call in one of the public switching telephone network 10, 11 and 12 so that a calling signal including a subscriber number is received in a corresponding one of the radio paging terrninals 100, 110 and 120. In the .
same manner, several calling signals are received in the radio paging terminals 100, 110 and 120. The subscriber numbers are checked as to whether or not the subscri.bers are registered in the paging system. In a case where the subscribers are registered thereln, the central processing units 104 of the respective radio paging terminals 100, 110 and 120, produces a pager identification number based on a subscriber number, and read the service zone informations Zl , Z2 and Z3 and the frequency informations fl , f2 and f corresponding to the subscriber numbers from the subscriber files shown in Figs. 4A to 4C. The data including the pager ident.ification numbers, the service zone informations and the frequency informations are supplied through the data output interface 105 to the paging processor 200 in which the queing of the pager identification numbers is performed for each of the local service zones 1 to 3 in the central processing uni-t 204. Considering the subscriber number indica-ted ; 20 by the symbol O , for instance, the pager : identification number is allocated to the channels CHs 1 of the local service zones 1 to 3 in accordance with the informations Zl, Z2 and Z3, and fl as shown in Fig. 8A. As to the subscriber number indicated by the : 25 symbol ~ , for instance, the pager identiiication number is allocated to the channels CHs 2 of the local service zones 1 to 3 in accordance with the z informations Zl , Z2 and Z3 and f2. After the queing oE the pager identification numbers is finished, the pager identification numbers are encoded in each of the local service zones 1 to 3 in accordance with the sequential channel order described before as shown in Fig. 8A. In other words, one cycle of, for instancel one minutes in which channel designating signals CDSs and sequentially arranged pager identification numbers of CH1 to CH3 are included is divided into three time slots 1 to 3. Considering the channel CH1 of the local service zone 1, for instance, a channel designating signal CDS is positioned in front of the pager identification numbers as indicated by the symbols O and O. In the time slot 1 of the local service zone 1, the one cycle comprises a channel designating signal CDS for designating the channel CH1, a preamble signal PRE for the bit synchronization of a pager receiver, a synchronization signal SC for the word synchronization of a pager receiver, a pager identification number D1 for designating the subscriber number indicated by the symbol O , and a pager iden-tification number D2 for designating the subscriber number indicated by the symbol O . An encoding of pager identification numbers is performed by use of, for instance, POCSAG code. The ; 25 pager identification number signals thus encoded are supplied to the expanders 300, 310 and 320 by which the ; pager identification number signals are distributed to ~ ~ be supplied to the transmitters 400, 410 and 420 in the .
local service zone 1, the transmitters 430, 440 and 450 in the local service zone 2, and the transmitters 460, 470 and 480 in the local service zone 3 respectively.
In this occasion, the divided signals are delayed to predetermined exten-ts in the output line interfaces 302, 303 and 304 of the expanders 300, 310 and 320 to realize a phasing of the radiated signals from the transmitters 400, 410 and 420 in the local service zone 1, the transmitters 430, 440 and 450 in the local service zone 2t and the transmitters 460, 470 and 480 in the local service zone 3. In each of -the transmitters as described above, the channel designating signals CDSs are sequentially checked in the down signal supervisory circuit 402 thereby to select one of the modulators 403, 404 and 405 so that the modulator 403 is selected to modulate the pager identification number signals of the subscriber numbers indicated by the symbols O and O at the time slot 1 in the local service zone 1 thereby producing paging signals, while the modulators 405 and 404 are selected at the same -time in the local service zones 2 and 3 respectively. Consequently, the antennas 407 of the transmitters 400, 410 and 420 radiate the paging signals of the subscribers numbers indicated by the symbolds O and a sequentially, as shown in Fig. 8B, ,.
in the local service zone 1. At the present stage, there is occured no problem to call subscribers in the 10~2 overlapping service area of the local service zones 1 and 2 because the transmitters 430, 440 and 450 radiate the paging signals of the channels CH3 for the subscriber numbers indicated by the symbols ~ and ~ as shown in Eig. 8A.
In the embodiment described above, the number of local service zones may be changed dependent on an area covered by a paging system~ The data transmission is performed between each of the radio paging terminals and the paging processor, the paging processor and each of the expanders, and one of the expanders and each of the transmitters by use of, for instance, RS-232-C
interface if data are transmitted in a building, and by use of, for instance, MODEM interface if data are transmitted between remote distance places.
Although the invention has been described with respect to specific embodiment for complete and clear disclosure, the appended claims are not to thus limited but are to be construed as embodying all modification and alternative constructions that may occur to one skilled in the art which fairly fall within the basic teaching herein set forth.
FIELD OF l'HE INVENTION
The invention relates to a paging system, and more particularly to a paging system in which calling signals of the same paging signal frequency can be used in more than two service zones.
BACKGROUND OF THE INVENTION
One of conventional paging systems comprises a plurality of apparatus each producing a paging signal in accordance with a calling signal which is received from a corresponding public switching telephone network. For instance, one of the apparatus covers a nation-wide service zone, and each of the remaining apparatus covers a corresponding one of local service zones. In each of the service zones, a paging signal is radiated from a plurality of antennas of the apparatus so that one of pager receivers each having a fixed receiving signal frequency can receive the paging signal.
According to the conventional paging system, however, frequencies of paging signals for the nation-wide service zone must be different from those of paging signals for the local service zones, and the same allocation of frequencies must be performed in two adjacent local service zones having an overlapping service area for the reason why a phasing of those .
paging signals can not be performed in the service zones. Further, a pager receiver must be replaced by one having another fixed receiving signal freguency in a case where a service zone is changed for a subscriber. As a result, an effective utilization of frequencies can not be realized in the conventional paging system.
SUMMARY O~ THE INVENTION
Accordingly, it is an object of the invention to provide a paging system in which the same paging signal frequency can be used in more -than two service zones having an overlapping service area.
It is a further objec-t of the invention to provide a paging system in which a pager receiver can be used in more -than two service zones.
It is a still further object of the invention to provide a paging system in which an effective utilization of frequencies can be realized.
According~to the invention, a paging system comprises, a predetermined number of radio paging terminals each having a subscriber file in which subscriber numbers, service zone informations and frequency informations are stored, each of said radio paging terminals produces a pager identification number, a service zone signal, and a frequency signal respectively corresponding to a subscriber number when each of said radio paging terminals finds said 0~2 subscriber number to be registered in said subscriber fi.le, a paging processor in which a queing of pager identification numbers received from said predetermined number of said radio paging terminals is performed in accordance with service zone signals further received therefrom so that said pager identification numbers are allocated to respective designated service zones, said pager identification numbers in each of said respec-tive designated service zones are further allocated to a predetermined number of time slots in accordance with frequency signals still further received from said predetermined number of said radio paging -terminals, said pager identification numbers thus allocated in regard to said service zone and frequency signals are encoded to produce pager identification number signals, and channel designating signals are added to said pager identification number signals in accordance with said : frequency signals, a predetermined number of expanders each : dividing said pager identification number signals having said channel identification signals in each of paging service zones into a predetermined number of said pager identification number signals, and a predetermined number of transmitters which are provided in said each of said paging service zones, ; each of said predetermined number of said transmitters ~L~ 02 radiating one of said pager identification nurnber signals in a Erequency designa-ted by one of said channel designa-ting signals, wherein said predetermined number of said time slots are synchronized among said paging service zones, and at least two of said pager iden-tification number signals are radlated with different frequencies in two adjacen-t paging service zones at one o~ said time slots.
RRIEF DESCRIPTION OF TIIE DRAWINGS
The invention will be explained in more detail in conjunction with following drawings wherein, Fig. 1 is an explanatory diagram showing a nation-wide service zone and local service zones, Fig. 2 is a block diagram showing a paging system in an embodiment according to the invention, Fig. 3 is a block diagram showing a radio paging terminal in the embodiment in Fig. 2, Figs. 4A to 4C are explanatory diagrams showing subscriber files in the radio paging terminals in Fig.
3, Fig. 5 is a block diagram showing a paging processor in the embodiment in Fig. 2, Fig. 6 is a block diagram showing an expander in the embodiment in Fig. 2, Fig. 7 is a block diagram showing a transmitter in the embodiment in Fig. 2, Figs. 8A and 8B are explanatory dlagrams showing s an oper~tion of the embodiment and a paging signal therein~
DESCRIPTION OF A PREFERRED EMBODIMENT
... .
Fig. 1 shows four service zones 0 to 3 which are covered by a paging system. I'he service zone 0 is of a nation-wide service zone, and the service zones 1 to 3 are of local service zones having overlapping service areas indicated by hatchings. In the conventional paging system as explained before, therefore, frequencies of paging signals must be different in the four service zones 0 to 3 from others because a phasing of -those paging signals can not be peformed therein.
Fig. 2 shows a paging system in an embodiment according to the invention. The paging system comprises 15 radio paging terminals 100, 110 and 120 respectively connected to public switching telephone networks 10, 11 and 12 thereby to receive calling signals from telephone sets, a paging processor 200 for queing pager identification numbers received from the radio paging 20 terminals 100, 110 and 120 in each of local se_vice zones 1 to 3 in accordance with service zone informations further received therefrom and for encoding the pager identification numbers allocated sequentially by frequency informations s-till further received therefrom to produce pager identification number signals, expanders 300, 310 and 320 respectively positioned in the local service zones 1 to 3 for dividing the pager identification nurnber signals by the number of transmi-tters, and transm:itters 400, 410 and 420, 430, 440 and 450, and 460, 470 and 480 respectively connected to the expanders 300, 310 and 320 in the local servi.ce zones 1 to 3 for modulating the pager identification number signals -to radiate paging signals.
Fig. 3 shows one of the radio paging terminals 100, 110 and 120 which comprises input trunk interfaces 10 101, 102 and 103 for receiving subscriber numbers from a corresponding one of the public switching telephone networks 10, 11 and 12, a central processing unit 104 having subscriber files to be described later, and a data output interface 105 through which informations of 15 pager identification numbers, service zones and fre-quencies are supplied to the paging processor 200.
Figs. 4A to 4C show the subscriber files contained in the central processing units 104 of the radio paging terminals 100, 110 and 120. In the subscriber files, symbols o , ~.and (`~ ~ 1''1 and ~ , :and ~ and ~ indicate subscriber numbers wherein the symbols O , O , and ~ designate all of the local service zones 1 to 3 (Zl to Z3), the symbol C~
designates two of the local service zones 1 and 2 (Zl and Z2 ), and the symbols ~ , ~ and ~
designate one of the local service zones 1 to 3, that is, is the local service zone 1(Zl), L,l is the local service zone 2(Z2), and ~ is -the local service zone ~913002 3(Z3). Frequencies of the paging signals are indicated in the subscriber files by "fl", "f2" and "f3"
which correspond to channels CH1 to CH3.
The subscriber files further include pager identification numbers corresponding to the subscriber numbers wherein the subscriber numbers are converted into the pager identification number in the central processing units 104. In the embodiment to be described hereinafter, the pager identification numbers are identical in regard to number to the subscriber numbers and also indicated by the same symbols as described above.
Fig. 5 shows the paging processor 200 which comprises data input interfaces 201, 202 and 203 through which the informations stored in the subscriber files shown in Figs. 4A to 4C are received therein, a central processing unit 204 for queing pager ~` identification numbers in each of -the local service zones 1 to 3 in accordance with the local service zone informations Zl to Z3, and encoders 205, 206 and 207 for encoding the pager identification numbers allocated sequentially by the frequency informations f1, f2 and f3 to produce pager identification number signals of a sequential order CH1, CH2 and CH3 for the ~25 local service zone 1, a sequential order CH3, CH1 and CH2 for the local service zone 2, and a sequential order CH2, CH3 and CH1 for the local service zone 3.
: .
~ ig. 6 shows one of -the expanders 300, 310 and 320 respectively positioned in the local service zones 1 to 3 which comprises an input line interface 301 through which the pager identification number signals are received therein, and output line interfaces 302, 303 and 304 each having a fixed delaying circuit for a phasing of the pager identification number signals, and through which distribu-ted pager identification number signals are supplied to the transmitters 400, 410 and 10 420, 430, 440 and 450, and 460, 470 and 480.
Fig. 7 shows one of the transmitters in the local service zones 1 to 3 which comprises an input line interface 401 through which one of the distributed pager identification number signals is received therein, a down signal supervisory circuit 402 for selecting one of channels CH1 to CH3 in accordance with channel designating signals/ modulators 403, 404 and 405 for producing CH1 to CH3 paging signals and one of which is selected by the down signal supervisory 20 circuit 402, a power amplifier 406 for amplifying one of the modulated paging signals, and an antenna 407 for radiating the paging signals to be received by pager receivers.
In opera-tion, a subscriber makes a telephone call in one of the public switching telephone network 10, 11 and 12 so that a calling signal including a subscriber number is received in a corresponding one of the radio paging terrninals 100, 110 and 120. In the .
same manner, several calling signals are received in the radio paging terminals 100, 110 and 120. The subscriber numbers are checked as to whether or not the subscri.bers are registered in the paging system. In a case where the subscribers are registered thereln, the central processing units 104 of the respective radio paging terminals 100, 110 and 120, produces a pager identification number based on a subscriber number, and read the service zone informations Zl , Z2 and Z3 and the frequency informations fl , f2 and f corresponding to the subscriber numbers from the subscriber files shown in Figs. 4A to 4C. The data including the pager ident.ification numbers, the service zone informations and the frequency informations are supplied through the data output interface 105 to the paging processor 200 in which the queing of the pager identification numbers is performed for each of the local service zones 1 to 3 in the central processing uni-t 204. Considering the subscriber number indica-ted ; 20 by the symbol O , for instance, the pager : identification number is allocated to the channels CHs 1 of the local service zones 1 to 3 in accordance with the informations Zl, Z2 and Z3, and fl as shown in Fig. 8A. As to the subscriber number indicated by the : 25 symbol ~ , for instance, the pager identiiication number is allocated to the channels CHs 2 of the local service zones 1 to 3 in accordance with the z informations Zl , Z2 and Z3 and f2. After the queing oE the pager identification numbers is finished, the pager identification numbers are encoded in each of the local service zones 1 to 3 in accordance with the sequential channel order described before as shown in Fig. 8A. In other words, one cycle of, for instancel one minutes in which channel designating signals CDSs and sequentially arranged pager identification numbers of CH1 to CH3 are included is divided into three time slots 1 to 3. Considering the channel CH1 of the local service zone 1, for instance, a channel designating signal CDS is positioned in front of the pager identification numbers as indicated by the symbols O and O. In the time slot 1 of the local service zone 1, the one cycle comprises a channel designating signal CDS for designating the channel CH1, a preamble signal PRE for the bit synchronization of a pager receiver, a synchronization signal SC for the word synchronization of a pager receiver, a pager identification number D1 for designating the subscriber number indicated by the symbol O , and a pager iden-tification number D2 for designating the subscriber number indicated by the symbol O . An encoding of pager identification numbers is performed by use of, for instance, POCSAG code. The ; 25 pager identification number signals thus encoded are supplied to the expanders 300, 310 and 320 by which the ; pager identification number signals are distributed to ~ ~ be supplied to the transmitters 400, 410 and 420 in the .
local service zone 1, the transmitters 430, 440 and 450 in the local service zone 2, and the transmitters 460, 470 and 480 in the local service zone 3 respectively.
In this occasion, the divided signals are delayed to predetermined exten-ts in the output line interfaces 302, 303 and 304 of the expanders 300, 310 and 320 to realize a phasing of the radiated signals from the transmitters 400, 410 and 420 in the local service zone 1, the transmitters 430, 440 and 450 in the local service zone 2t and the transmitters 460, 470 and 480 in the local service zone 3. In each of -the transmitters as described above, the channel designating signals CDSs are sequentially checked in the down signal supervisory circuit 402 thereby to select one of the modulators 403, 404 and 405 so that the modulator 403 is selected to modulate the pager identification number signals of the subscriber numbers indicated by the symbols O and O at the time slot 1 in the local service zone 1 thereby producing paging signals, while the modulators 405 and 404 are selected at the same -time in the local service zones 2 and 3 respectively. Consequently, the antennas 407 of the transmitters 400, 410 and 420 radiate the paging signals of the subscribers numbers indicated by the symbolds O and a sequentially, as shown in Fig. 8B, ,.
in the local service zone 1. At the present stage, there is occured no problem to call subscribers in the 10~2 overlapping service area of the local service zones 1 and 2 because the transmitters 430, 440 and 450 radiate the paging signals of the channels CH3 for the subscriber numbers indicated by the symbols ~ and ~ as shown in Eig. 8A.
In the embodiment described above, the number of local service zones may be changed dependent on an area covered by a paging system~ The data transmission is performed between each of the radio paging terminals and the paging processor, the paging processor and each of the expanders, and one of the expanders and each of the transmitters by use of, for instance, RS-232-C
interface if data are transmitted in a building, and by use of, for instance, MODEM interface if data are transmitted between remote distance places.
Although the invention has been described with respect to specific embodiment for complete and clear disclosure, the appended claims are not to thus limited but are to be construed as embodying all modification and alternative constructions that may occur to one skilled in the art which fairly fall within the basic teaching herein set forth.
Claims (4)
1. A paging system comprising, a predetermined number of radio paging terminals each having a subscriber file in which subscriber numbers, pager identification numbers, service zone informations and frequency informations are stored, each of said radio paging terminals produces a pager identification number, a service zone signal, and a frequency signal respectively corresponding to a subscriber number when each of said radio paging terminals finds said subscriber number to be registered in said subscriber file, a paging processor in which a queing of pager identification numbers received from said predetermined number of said radio paging terminals is performed in accordance with service zone signals further received therefrom so that said pager identification numbers are allocated to respective designated service zones, said pager identification numbers in each of said respective designated service zones are further allocated to a predetermined number of time slots in accordance with frequency signals still further received from said predetermined number of said radio paging terminals, said pager identification numbers thus allocated in regard to said service zone and frequency signals are encoded to produce pager identification number signals, and channel designating signals are added to said pager identification number signals in accordance with said frequency signals, a predetermined number of expanders each dividing said pager identification number signals having said channel identification signals in each of paging service zones into a predetermined number of said pager identification number signals, and a predetermined number of transmitters which are provided in said each of said paging service zones, each of said predetermined number of said transmitters radiating one of said pager identification number signals in a frequency designated by one of said channel designating signals, wherein said predetermined number of said time slots are synchronized among said paging service zones, and at least two of said pager identification number signals are radiated with different frequencies in two adjacent paging service zones at one of said time slots.
2. A paging system according to claim 1, wherein each of said predetermined number of said expanders is provided with a predetermined number of output line interfaces through which said predetermined number of said pager identification number signals are passed, each of said predetermined number of said output line interfaces delaying a corresponding one of said predetermined number of said pager identification number signals by a predetermined time.
3. A paging system according to claim 1, wherein each of said predetermined number of said transmitters includes a predetermined number of modulators each modulating a corresponding one of said predetermined number of said pager identification number signals with a frequency designated by a corresponding one of said channel designating signals.
4. A paging system according to claim 3, wherein said each of said predetermined number of said transmitters includes a down signal supervisory circuit for detecting said corresponding one of said channel designating signals to activate a corresponding one of said predetermined number of said modulators.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62050377A JPH0650837B2 (en) | 1987-03-06 | 1987-03-06 | Paging system |
| JP62-50377 | 1987-03-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1298002C true CA1298002C (en) | 1992-03-24 |
Family
ID=12857188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000560403A Expired - Lifetime CA1298002C (en) | 1987-03-06 | 1988-03-03 | Paging system |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5111197A (en) |
| EP (1) | EP0281150B1 (en) |
| JP (1) | JPH0650837B2 (en) |
| AU (1) | AU600562B2 (en) |
| CA (1) | CA1298002C (en) |
| DE (1) | DE3851555T2 (en) |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5416827A (en) * | 1985-11-27 | 1995-05-16 | Seiko Communications Holding Nv | Paging system with registration mode which interrupts the pager's standard operating protocol and is energized with a higher duty cycle |
| JPH0650837B2 (en) * | 1987-03-06 | 1994-06-29 | 日本電気株式会社 | Paging system |
| US4914649A (en) * | 1988-09-12 | 1990-04-03 | Motorola, Inc. | Multiple frequency message system |
| JP3222485B2 (en) * | 1990-06-20 | 2001-10-29 | エニー株式会社 | Portable wireless transmission / reception method |
| US5239671A (en) * | 1990-11-13 | 1993-08-24 | Pagemart, Inc. | Simulcast satellite paging system with provision for signal interruption |
| EP0501706B1 (en) * | 1991-02-25 | 1998-10-14 | Motorola, Inc. | Object location system |
| JPH0575526A (en) * | 1991-02-25 | 1993-03-26 | Pagemart Inc | Adaptive calling device |
| US5202912A (en) * | 1991-09-09 | 1993-04-13 | Motorola, Inc. | Method and apparatus for providing telepoint to telepoint calling between pager equipped handsets |
| US5369681A (en) * | 1992-05-12 | 1994-11-29 | Telefonaktiebolaget L M Ericsson | Cellular communications system utilizing paging areas |
| EP0627863A3 (en) * | 1993-06-04 | 1995-12-20 | Ibm | An automated system for processing multiple paging requests. |
| US6353739B1 (en) * | 1993-12-20 | 2002-03-05 | Motorola, Inc. | Wide area paging system having automatic service area log-in |
| JP2896741B2 (en) * | 1994-05-10 | 1999-05-31 | エヌ・ティ・ティ移動通信網株式会社 | Wireless paging method |
| US5542115A (en) * | 1994-06-24 | 1996-07-30 | Pioneer Tech Development Limited | Paging method and apparatus |
| US5684859A (en) * | 1995-05-01 | 1997-11-04 | Motorola, Inc. | Method and apparatus for downloading location specific information to selective call receivers |
| US5812536A (en) * | 1995-07-05 | 1998-09-22 | Pitney Bowes Inc. | Secure accounting system employing RF communications for enhanced security and functionality |
| US5953639A (en) * | 1997-05-22 | 1999-09-14 | Wireless Online, Inc. | Multi-beam encoding system for two-way paging |
| US7346365B1 (en) * | 2002-04-16 | 2008-03-18 | Faulkner Interstices Llc | Smart antenna system and method |
| US7529525B1 (en) | 2002-04-16 | 2009-05-05 | Faulkner Interstices Llc | Method and apparatus for collecting information for use in a smart antenna system |
| US7065383B1 (en) | 2002-04-16 | 2006-06-20 | Omri Hovers | Method and apparatus for synchronizing a smart antenna apparatus with a base station transceiver |
| US7289826B1 (en) * | 2002-04-16 | 2007-10-30 | Faulkner Interstices, Llc | Method and apparatus for beam selection in a smart antenna system |
| US7983696B1 (en) * | 2007-07-02 | 2011-07-19 | Sprint Spectrum L.P. | Dynamic variation of paging power based on paging slot frequency |
| US8521195B1 (en) | 2010-04-07 | 2013-08-27 | Sprint Spectrum L.P. | Paging power control based on page concatenation |
| US8306558B1 (en) | 2010-05-24 | 2012-11-06 | Sprint Spectrum L.P. | Dynamic adjustment of paging power based on page-type |
| US10524230B1 (en) | 2017-06-21 | 2019-12-31 | Sprint Spectrum L.P. | Dynamic paging concatenation methods and systems |
| US10051603B1 (en) | 2017-06-21 | 2018-08-14 | Sprint Spectrum L.P. | Methods and systems for adjusting page transmission power |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3310741A (en) * | 1965-07-21 | 1967-03-21 | Nederlanden Staat | System for alternately transmitting coded messages on a predetermined plurality of carrier frequencies from a plurality of transistors |
| JPS5328310A (en) * | 1976-08-30 | 1978-03-16 | Nippon Telegr & Teleph Corp <Ntt> | Mobile radio control system |
| JPS56126339A (en) * | 1980-03-10 | 1981-10-03 | Nec Corp | Mobile communication system |
| DE3014859C2 (en) * | 1980-04-17 | 1982-06-24 | Siemens AG, 1000 Berlin und 8000 München | Mobile radio network |
| NZ197059A (en) * | 1980-05-23 | 1983-11-30 | Post Office | Nationwide radiopaging:selective zone transmissions |
| JPS5961644U (en) * | 1982-10-15 | 1984-04-23 | 日本電気株式会社 | selective call receiver |
| DE3321997A1 (en) * | 1982-12-03 | 1984-06-14 | ANT Nachrichtentechnik GmbH, 7150 Backnang | RADIO SYSTEM |
| US4644351A (en) * | 1984-05-08 | 1987-02-17 | Motorola, Inc. | Two way personal message system with extended coverage |
| US4713808A (en) * | 1985-11-27 | 1987-12-15 | A T & E Corporation | Watch pager system and communication protocol |
| DE3527330A1 (en) * | 1985-07-31 | 1987-02-05 | Philips Patentverwaltung | DIGITAL RADIO TRANSMISSION SYSTEM WITH CONNECTING ORGANIZATION CHANNEL IN THE TIME MULTIPLEX FRAME |
| DE3527329A1 (en) * | 1985-07-31 | 1987-02-05 | Philips Patentverwaltung | DIGITAL RADIO TRANSMISSION SYSTEM WITH VARIABLE TIME SLOT DURATION OF TIME SLOTS IN TIME MULTIPLEX FRAME |
| US4696052A (en) * | 1985-12-31 | 1987-09-22 | Motorola Inc. | Simulcast transmitter apparatus having automatic synchronization capability |
| JPH0650837B2 (en) * | 1987-03-06 | 1994-06-29 | 日本電気株式会社 | Paging system |
| US4878051A (en) * | 1988-02-22 | 1989-10-31 | Telefind Corp. | Paging system with commands for changing functionality of a paging receiver |
| US4914649A (en) * | 1988-09-12 | 1990-04-03 | Motorola, Inc. | Multiple frequency message system |
-
1987
- 1987-03-06 JP JP62050377A patent/JPH0650837B2/en not_active Expired - Fee Related
-
1988
- 1988-03-03 CA CA000560403A patent/CA1298002C/en not_active Expired - Lifetime
- 1988-03-04 AU AU12719/88A patent/AU600562B2/en not_active Ceased
- 1988-03-04 EP EP88103379A patent/EP0281150B1/en not_active Expired - Lifetime
- 1988-03-04 DE DE3851555T patent/DE3851555T2/en not_active Expired - Fee Related
-
1990
- 1990-02-21 US US07/483,314 patent/US5111197A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0281150A2 (en) | 1988-09-07 |
| US5111197A (en) | 1992-05-05 |
| AU600562B2 (en) | 1990-08-16 |
| JPH0650837B2 (en) | 1994-06-29 |
| DE3851555T2 (en) | 1995-06-01 |
| EP0281150B1 (en) | 1994-09-21 |
| JPS63217834A (en) | 1988-09-09 |
| EP0281150A3 (en) | 1989-12-13 |
| AU1271988A (en) | 1988-09-08 |
| DE3851555D1 (en) | 1994-10-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 20000324 |