JPH01218138A - Radio call system - Google Patents

Abstract

PURPOSE:To eliminate the need for sequential scanning of all frequencies and to attain quick and efficient call by assigning at least one call common frequency to adjacent service areas and differentiating the service area information sent in a call frequency and the transmission timing of the selective call signal between adjacent areas. CONSTITUTION:A common frequency in the same service area is assigned to each of plural radio base station 11-1n, 21-2n installed in the service areas 1, 2 as a call frequency. At least one frequency is assigned in the adjacent service areas 1, 2 as a call frequency f1 and a receiver 9 moving in plural service areas is called. Service area information and the selective call signal are sent simultaneously by the call frequency f1 in each service area and the transmission timing of signal by the call frequency f1 is made different between the adjacent service areas 1, 2. Thus, it is possible to apply call by having only to take synchronization again in the receiver.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a radio paging system that allows calls from a radio base station to a mobile station in a plurality of service areas.

"Prior Art J" FIG. 5 is a block diagram showing an example of the configuration of a conventional radio paging system.

Here, for simplicity, we will use two service areas l and 2.
We will explain the case where . Each service area 1
．． 2 includes a plurality of wireless base stations 11+12. ...In and 2, . 2,...2n are installed.

Now, when a subscriber 5 in the general telephone network calls a receiver 9 located in a service area I, the calling request from the subscriber 5 is sent to the calling signal generator 7 via the exchange 6.

The paging signal generator 7 generates a selective paging signal and sends it to the radio base stations 11+ 1 , . . . in the same area l.

Each radio base station 1+, It, .

Similarly, when calling a receiver located in the service area 2, the output of the calling signal generator 8 connected to the subscriber 5 is the radio base station 2+, 2t installed in the service area 2.
, . . 2n, and simultaneously transmit paging signals at the same paging frequency r.

In this way, in the conventional radio paging system, different paging frequencies are assigned to each service area, and multiple radio base stations installed in the same service area
Selective paging signals are simultaneously transmitted using the paging frequency. Furthermore, the radio paging reception i was for receiving only one of the paging frequencies.

[Problems to be Solved by the Invention] Since the conventional radio paging system was configured as described above, when moving from one service area to another, it was not possible to receive paging service in the destination service area.

For example, since a receiver moving within service area 1 can only receive signals of frequency f, it has the disadvantage that it cannot obtain paging services in a plurality of service areas.

The present invention was made against this background, and an object of the present invention is to provide a radio paging system that allows a receiver to be called in a plurality of service areas.

"Means for Solving the Problems" In order to solve the above problems, the present invention has a plurality of service areas, and has a plurality of wireless base stations installed in each service area. In this wireless system, a common frequency is assigned as a calling frequency, and at least one same frequency is assigned as a calling frequency in adjacent service areas, so that calls can be made to receivers moving within multiple service areas. The paging method is such that within each service area, service area information for identifying the service area and a selective paging signal for paging a receiver are simultaneously transmitted using a paging frequency, while between adjacent service areas. The present invention is characterized in that the timing of signal transmission is made different depending on the calling frequency.

"Operation" According to the present invention, at least one common paging frequency is assigned to adjacent service areas, and the transmission timing of the service area information and selective paging signal transmitted on the paging frequency is adjusted between the adjacent service areas. Since the service area is different, calls can be made smoothly when moving to an adjacent service area.

That is, when moving to an adjacent service area, calls are made on the same calling frequency, so calls can be made by simply resynchronizing and resynchronizing on the receiver side.

If the same calling frequency cannot be used for reasons such as being blocked and it must be changed, the receiving frequency can be changed using the calling frequency and calling number recorded in the memory circuit inside the receiver. Claim 2). Thereby, the reception frequency can be determined quickly and efficiently.

"Example" Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a radio paging system according to an embodiment of the present invention.

A case where service areas 1 and 2 are adjacent to each other will be explained.

Each service area 1.2 has multiple wireless base stations 11+
1t, "bow.", and 2..2.,...2n are installed. Each wireless base station 11+1,...In, L, l
,...2. .

As shown in FIG. 2, calling frequencies are assigned so that at least one frequency is the same in adjacent service areas.

In FIG. 2, f1 to "4" are calling frequencies, for example,
Frequency "," is assigned to each of service areas 1 to 3, and frequency "f" is assigned to service area 2.3. The number of assigned frequencies depends on the number of wireless calling subscribers in the service area. It is determined.

FIG. 3 shows an example of a calling signal.

The calling signal 10 has a frame synchronization par'Z-:/10a,
Service area information 10b that differs for each service area and N corresponding to each radio paging receiver number that receives a call.
selective calling signal 10c.

As the service area information 10b, for example, a coded service area name is given. here,
It is assumed that the frame synchronization pattern 10a is common to all service areas.

If paging signals IO are simultaneously transmitted between adjacent areas that have been assigned a common paging frequency, the radio waves transmitted from the wireless base stations in each service area will interfere with each other near the boundaries of the service areas. , beat-like fading occurs. Therefore, the receiver 9 may receive the service area information 10b and the selective calling signal 10c for one own station by mistake.

Therefore, in this embodiment, as shown in FIG. 4, the transmission timing of the paging signal IO using the same paging frequency is shifted in adjacent service areas so that the transmission times do not overlap, thereby preventing radio wave interference. This prevents erroneous reception of the service area information tab.

Next, an example of the operation of the receiver in this system will be described using FIG. 2, taking as an example a case where the receiver moves from one service area to another.

It is assumed that the receiver 9 is in a state where it can receive a call on the calling frequency f assigned to the service area 1. Further, one of the common calling frequencies in service areas 1 and 2 is assumed to be fl.

When a subscriber 5 in the general telephone network calls a receiver 9 in the service area 1, the call request from the subscriber 5 is sent to the calling signal generator 7 via the exchange 6. The paging signal generating device 7 generates a selective paging signal 10c and calls the radio base stations 11+ 1 ! in the same area! Send to +...

Each radio base station 1, 1, . . . simultaneously transmits a signal modulated by the selective calling signal 10c at the same calling frequency f, and calls the receiver 9 within the service area l.

At the calling frequency r, a synchronizing signal is periodically transmitted regardless of whether there is a calling, and the receiver 9 performs an intermittent reception operation in synchronization with the synchronizing signal. A selective calling signal 10c is sent to the receiver 9 within the time that the receiver 9 is in the receiving state.
is not transmitted, the receiver 9 can determine whether or not there is a call to its own station by receiving the call frequency r1.

Further, the receiver 9 reads out the area code corresponding to the service area where the receiver 9 is located from the service area information 10b included in the calling signal 10, stores it in the memory circuit within the receiver 9, and stores the information. The user is informed of this by displaying it on a display provided inside the receiver 9 or by emitting an alarm or the like.

When the receiver 9 moves from service area 1 to service area 2, the sending timing of the paging signal IO changes, so the timing of intermittent reception in service area 1 is as follows.
Frame synchronization pattern 1Oa1 or service area information 10b cannot be received. Upon detecting this, the receiver 9 establishes synchronization for reception again.

At this time, check the service area information tab in service area 1 and the service area information 10b after newly establishing synchronization, and if they are different,
The receiver 9 stores a calling number given in advance for each service area and a frequency for receiving a call in a ROM (Re
ad 0nly Memory). Then, based on the read information, the calling frequency assigned to the service area is determined, and the intermittent reception operation is started on the frequency to prepare for the calling (claim 2).

Normally, changing the receiving frequency is an auxiliary operation that is performed only when the calling frequency used in the service area before migration is not allocated in the new service area. This operation is performed by reading the calling frequency in the adjacent area from the ROM in the receiver 9 in accordance with a predetermined priority order, and setting the reception frequency to the calling frequency.

The transition from the service area 2 to the service area 3 indicated by the symbol ■ in FIG. 3(d) shows this situation.

In addition to the calling frequency for each service area for each receiver 9 described above, information on the adjacency of the service areas is also written in the ROM in the receiver 9.

Note that calls to receivers can be simultaneously sent out on the same calling frequency in non-adjacent service areas and if radio wave interference is not a problem.

In addition, based on the service area information shown on the display inside the receiver 9, the fixed network side is notified of the service area where the receiver 9 is located through the telephone line, that is, by registering the location, all Instead of receiving a call in an area, it is also possible to receive a call only in one of the specified service areas (claim 3).

"Effects of the Invention" As explained above, according to the present invention, it is possible to receive paging services in a plurality of service areas.

In addition, the call number given in advance for each service area and the frequency to receive the call are sent to the RO in the receiver.
M, and based on this information, determine the calling frequency assigned to the service area, switch to intermittent reception operation at this frequency, and prepare for the call, then it is necessary to sequentially scan all frequencies. Therefore, quick and efficient calling is possible (Claim 2).

Furthermore, based on the service area information shown on the display inside the receiver, the fixed network is notified of the service area where the receiver is located and the location is registered, allowing calls to be made in one service area. (Claim 3).

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a diagram showing an example of allocation of calling frequencies and how reception frequencies are switched when moving to a service area, and FIG. 3 is a diagram showing an example of calling frequency allocation. FIG. 4 is a conceptual diagram showing a configuration example, FIG. 4 is a waveform diagram showing the sending timing of a paging signal in the above embodiment, and FIG. 5 is a block diagram showing a configuration example of a conventional wireless paging system. 1.2...Service area, 1+, 'lt,..., 2I, 2t,...Radio base station, 5...Subscriber, 6... ...Switchboard, 7.8...Call signal generator, 9...
Receiver, lO... Calling signal. Fig. 1 4 Tochi 5D Ha^ 1 (Toida 112 Fig. 1) +, Earth 1 Kawaya; Leather loss - 111 damage and Ia 1
1 and the number Tn Q
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Claims (2)

[Claims] (1) It has multiple service areas, and a common frequency is assigned as a calling frequency within the same service area to each of the multiple radio base stations installed in each service area, and at least Assign one same frequency as the calling frequency,
A radio paging system that calls receivers moving within multiple service areas, wherein within each service area, service area information and reception information for identifying the service area are transmitted based on the paging frequency. 1. A radio paging system characterized in that selective paging signals for paging a machine are simultaneously transmitted, while the timing of signal transmission using the paging frequency is made different between adjacent service areas. (2) In the receiver, based on the service area information,
2. The receiving frequency is set by reading a calling frequency and a calling number within a destination service area predetermined for each receiver from a memory circuit provided inside the receiver. wireless paging method. (3) Based on the service area information received by the receiver, the person carrying the receiver registers the location by notifying the fixed network including the wireless base station of the destination service area through the telephone line, and registers the location. Claim 1 characterized in that the call is made only in a specific service area where the receiver exists based on the
Radio paging method described.