JPH10304468A - Communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system in which a base station makes efficient communication with plural PHS terminals. SOLUTION: A private base station 5 transmits a call signal, including a special ID to each of PHS terminals 7-1, 7-2,.... Each of the PHS terminals 7-1, 7-2,... makes communication with each of meters 7-1, 7-2,... to acquire information, such as metering values and makes a call to the private base station 5 after the lapse of a time interval which depends on the ID of each of the PHS terminals 7-1, 7-2,... or according to a prescribed schedule.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system using a PHS terminal.

[0002]

2. Description of the Related Art Communication between a base station and each PHS terminal in a conventional PHS automatic meter reading system is shown in FIG.
Will be described with reference to a schematic configuration diagram of the conventional communication system.
As shown in FIG. 9, the base station 101 transmits each PHS terminal (P
HS) 103-1, 103-2,..., 103-n, and PHSs 103-1, 103-2,.
03-n are connected to the meters 9-1, 9-2,... 9-n, respectively.

.. Perform intermittent operation, and when performing automatic meter reading, the base station 101
, Polling is performed for each PHS 103-1, 103-2,.

[0004]

SUMMARY OF THE INVENTION However, PHS
, 103-1, 103-2,... Are intermittently driven, so when the base station 101 makes a call, the base station 101 cannot immediately respond and a time lag occurs before communication can be started. For example, the polling interval is 60 seconds, PH
In the case where the number of S103s is 50, the connection time is 1 second, and the data transmission and reception time is 1 second, the required communication time is (60+
1 + 1) × 50 = 3100 seconds.

As described above, the P registered in the base station 101
When the number of HSs 103 increases, there is a problem that a large amount of useless time occurs as a whole and a considerable delay occurs.

The present invention has been made in consideration of such a problem, and it is an object of the present invention to provide a base station in which a plurality of P
An object of the present invention is to provide a communication system capable of efficiently communicating with an HS terminal.

[0007]

In order to achieve the above object, the present invention comprises a base station connected to a center, and a plurality of PHS terminals respectively connected to a plurality of meters. By performing communication between a station and each of the PHS terminals, in a communication system in which communication is performed between the center and each of the meters, the base station calls each of the PHS terminals simultaneously, Each PHS terminal reads information from a meter and sends the information to the base station at predetermined time intervals.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Embodiments will be described in detail. FIG. 1 is a schematic configuration diagram of a communication system according to one embodiment of the present invention. As shown in FIG. 1, the system includes a center 1, a base station 3, a private base station 5, PHS terminals (PHS) 7-1, 7-2,
.. 7-n, meters 9-1, 9-2,.

The center 1 is connected to the base station 3 via a communication line, and PHSs 7-1, 7-2,.
1, 9-2,... Are connected. The private base station 5 wirelessly communicates with the base station 3 and the PHSs 7-1, 7-2,... As the meters 9-1, 9-2, ..., gas meters,
There are electric meters, water meters and the like.

When the center 1 performs an automatic meter reading or the like, this command is sent to the base station 3, the private base station 5, and the PHSs 7-1 and 7-.
Are sent to the meters 9-1, 9-2,. Data such as meter readings of each meter 9-1, 9-2,.
S7-1, 7-2,..., Are sent to the center 1 via the private base station 5 and the base station 3. That is, the private base station 5 and each PH
By communicating with S7-1, 7-2, ...,
Communication is performed between the center 1 and each of the meters 9-1, 9-2,....

Next, the private base station 5 and each PHS 7-1,
7-2,... Will be described. FIG. 2 is a flowchart showing a communication procedure. FIG. 3 is a view for explaining step 201 in FIG. 2, and FIG. 4 is a step 203 in FIG.
FIG. As shown in FIGS. 2 and 3, first,
The private base station 5 receiving the command from the center 1
, 7-2, ..., a call signal is transmitted with a special ID (step 201). At this time, each PHS7-
1, 7-2,... Recognize the ringing signal and do not respond. After transmitting the calling signal for a certain period of time, the private base station 5 stops and enters a standby state.

Next, each of the PHSs 7-
, Communicate with the meters 7-1, 7-2,... To acquire information such as meter readings (step 202).
Each of the PHSs 7-1, 7-2,... Makes a call to the private base station 5 after a lapse of a time interval depending on the ID of each of the PHSs 7-1, 7-2,. (Step 203).

The time interval depending on the ID of each of the PHSs 7-1, 7-2,... Is, for example, after (ID number × 4) seconds, as shown in FIG. PHS7
-2 calls after 8 seconds, and PHS7-3 calls after 12 seconds. Since the private base station 5 is always in a standby state, it can promptly receive a call from each of the PHSs 7-1, 7-2,... And perform communication (step 204).

When communication is performed by such a method, for example,
When there are 50 PHS7s, the time to connect is 1 second, the time required for data transmission and reception is 1 second, the time to call the next PHS7 is 1 second, and the private base station 5 transmits a call signal for 10 seconds. When the communication time is calculated, 10+ (1 + 1 +
1) × 50 = 160, and communication can be completed in 160 seconds. After that, the information obtained by the private base station 5
It is sent to the center 1 via the base station 3.

As shown in step 201 of FIG. 2 and FIG. 3, the private base station 5 receiving the command from the center 1
A call signal is sent to the HSs 7-1, 7-2,... With a special ID. The special ID call signal will be described in detail with reference to the drawings.

FIG. 5 shows that the private-use base station 5 has the PHS 7-
It is a figure which shows the control physical slot of the signal transmitted with respect to 1, 7-2, .... As shown in FIG. 5, the control physical slot 21 has 240 bits,
(42 bits), caller identification code 25 (28 bits), I
(SCCH) 27 (34 bits) and the like.

FIG. 6 is a diagram showing an I (SCCH) 27 of the control physical slot 21. As shown in FIG. 6, the I (SCCH) 27 is 34 bits and has a message type 29, an LCH type,...

FIG. 7 is a diagram showing the message type 29. As shown in FIG. 7, the message type 29 is 8 bits, and the upper 5 bits are “10000”. Then, “call”, “response” and the like are determined by the combination of “0” and “1” set in the lower three bits respectively.

For example, when the lower three bits are "000", the private base station 5 calls each of the PHSs 7-1, 7-2,...
7-1, 7-2,..., Etc.

Then, when "paging all" is performed, "100" is set in the lower three bits. When calling all at once, call "000", even if it is not "100".
A pattern (for example, “110”) other than the response “001” and the synchronization “010” may be set.

The lower 3 bits of the message type 29 are "1".
In the case of “00”, each of the PHSs 7-1, 7-2,... Note that by setting another specific pattern in the message type 29, simultaneous closing of the meter 9, simultaneous opening of the meter 9, and the like can be performed.

As described above, the private base station 5 is connected to each PHS 7-1,
7-2, ..., a case where the message type 29 of the I (SCCH) 27 is used for the call signal of the special ID transmitted to the..., But the destination identification code 23 can also be used. This will be described with reference to the drawing showing the destination identification code 23 and the source identification code 25 of FIG.

As shown in FIG. 8, the destination identification code 23 is composed of a system call code 41 (29 bits) and a PS call number 43.
(13 bits). The 13 bits of the PS calling number 43 are divided into 5 bits and 8 bits. An ID indicating a general call is assigned to the 8-bit part, and a time from when each PHS 7-1, 7-2,... Receives the general call to when the PHS 7-1, 7-2,.
That is, the delay time (second) is set.

For example, in the simultaneous calling, the 8-bit portion is set to all "1" and the 5-bit portion is set to the delay time (second). At this time, each of the PHSs 7-1, 7-2,... That has received the paging signal calls the private base station 5 after the elapse of the delay time indicated in the 5-bit portion. That is, by operating the PS calling number 43 of the destination identification code 23,
A call schedule can be incorporated in a signal for performing a general call.

As described above, according to the present embodiment, when the private base station 5 calls a special ID, the PHS 7-1,
7-2,... Acquire the information of the meters 7-1, 7-2,.
Place a call according to a time interval depending on D or a predetermined schedule. Therefore, time can be used efficiently and quick communication can be performed.

The present invention can be modified in various ways. For example, in FIG. 1, the base station 3 communicates directly with each of the PHSs 7-1, 7-2,... It can be applied to various systems.

[0027]

As described above, according to the present invention, the base station can efficiently communicate with a plurality of PHS terminals.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a communication system according to an embodiment of the present invention;

FIG. 2 is a flowchart showing an operation procedure of the communication system;

FIG. 3 is a view for explaining step 201 in FIG. 2;

FIG. 4 is a view for explaining step 203 in FIG. 2;

FIG. 5 is a diagram showing a physical slot for control.

FIG. 6 is a diagram showing I (SCCH) 27;

FIG. 7 is a diagram showing a message type 29;

FIG. 8 is a diagram showing a receiving identification code 23 and a calling identification code 25;

FIG. 9 is a schematic configuration diagram of a conventional communication system.

[Explanation of symbols]

 1 center 3 base station 5 private base station 7 PHS 9 meter 21 control physical slot 23 destination identification code 25 source identification Code 25 27 I (SCCH) 29 Message type 41 System call code 43 PS call number 45 PS call code

Claims (8)

[Claims] 1. A base station connected to a center, and a plurality of PHS terminals respectively connected to a plurality of meters, wherein communication is performed between the base station and each of the PHS terminals. In a communication system in which communication is performed between the center and each of the meters, the base station calls each of the PHS terminals at once, and each of the PHS terminals reads information of the meters, and at predetermined time intervals, A communication system for transmitting the information to the base station. 2. The communication system according to claim 1, wherein when the base station calls each of the PHS terminals simultaneously, a special ID number is sent. 3. The special ID number is an SCC in a telegram.
The special ID number according to claim 2, wherein the special ID number is set in an H message. 4. The special ID number according to claim 2, wherein the special ID number is set in a PS call number in a telegram. 5. The communication system according to claim 1, wherein when each of said PHS terminals sends meter information to said base station, said PHS terminal sends information according to a schedule given in advance to each PHS terminal. . 6. The schedule according to claim 5, wherein the schedule is set in a PS call number in a telegram. 7. The communication according to claim 1, wherein each PHS terminal transmits information of a meter to the base station at a time interval depending on an ID of each PHS terminal. system. 8. The gas meter, the water meter,
The communication system according to claim 1, wherein the communication system is any one of an electric meter.