JPH08242476A - Radio calling system - Google Patents

Abstract

PURPOSE: To obtain the radio calling system in which radio calling is surely and efficiently made through the adoption of a simple system in a radio calling system. CONSTITUTION: The system is provided with a base station 100 that generates a radio call signal including an address code part and a message code part in response to a call request to a subscriber and sends the same radio call signal to one call request for plural number of times within a prescribed time through a radio channel and with a reception terminal equipment 200 that receives the radio call signal from the base station 100 and applies call reception processing to a content addressed to itself and provides an output. In the radio calling system as above, the base station 100 adds a message serial number to the radio call signal and a same message serial number to the same radio call signal to a same reception terminal equipment 200. Preferably the message serial number is added to an address code part or a message code part of the radio call signal. Furthermore, upon the receipt of the radio call signal with the same message serial number within a prescribed time, the reception terminal equipment 200 does not make call reception operation afterward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio paging system, and more particularly, to a radio paging signal including an address code portion and a message code portion in response to a paging request to a subscriber, and the same paging request for one paging request. The present invention relates to a radio paging system that includes a base station that wirelessly transmits a radio paging signal a plurality of times within a predetermined time, and a receiving terminal that receives a radio paging signal from the base station, performs incoming processing on the content addressed to itself, and outputs the content.

Generally, in this type of radio paging system,
Since the receiving terminal does not return the incoming call response to the base station, the base station cannot confirm whether or not the radio paging signal reaches the receiving terminal. On the other hand, the portable receiving terminal sometimes moves out of the wireless service area and cannot receive the wireless ringing signal transmitted during that time. Therefore, it is desired to make such a radio call to the subscriber more reliable.

[0003]

2. Description of the Related Art A conventional base station transmits the same radio paging signal for one paging request a plurality of times at appropriate time intervals. On the other hand, the conventional receiving terminal compares all the message data of the wireless ringing signal received at the present time with all the message data received and stored in the past, and if not the same, stores the current received data, Also, the received data is displayed on the display panel, and if it is the same, the current reception data is rejected (discarded).

[0004]

However, in the method of comparing all message data as described above, it is necessary for the receiving terminal to receive all wireless ringing signals, perform error correction, and store in the memory. The processing load on the receiving terminal is heavy. Moreover, if the message data length becomes large, the processing of the CPU becomes complicated correspondingly, and other processing (interrupt processing of panel switch operation, etc.) may not be promptly dealt with.

It is an object of the present invention to provide a radio paging system which can make reliable radio paging efficiently by adopting a simple method.

[0006]

The above-mentioned problems can be solved by the structure shown in FIG. That is, the radio paging system of the present invention generates a radio paging signal including an address code part and a message code part in response to a paging request to a subscriber, and outputs the same paging signal for one paging request within a predetermined time. In a radio paging system that includes a base station 100 that wirelessly transmits a plurality of times, and a receiving terminal 200 that receives a radio paging signal from the base station 100, processes the incoming contents, and outputs the contents, outputs the radio paging signal to the base station 100. The message serial number is added to the signal, and the same message serial number is added to the same radio paging signal for the same receiving terminal 200.

[0007]

In FIG. 1, the base station 100 has time points t _1-
call request A~C are respectively inputted to t ₃ for the receiving terminal 200. The base station 100 generates a radio paging signal A for the paging request A at time t ₁ , adds a message sequence number 1 to the radio paging signal A, and performs radio transmission. Similarly, the time t
₂ and t ₃ , radio call signals B for call requests B and C,
C is generated, message sequence numbers 2 and 3 are added to these, and wireless transmission is performed. Then, at a time t ₄ before a predetermined time has elapsed from the time t _{1, the} radio call signal A for the call request A is generated or the radio call signal A already generated is used, and the same as the above. The message serial number 1 is added and wireless transmission is performed.

Thus, according to the present invention, the base station 10
0 adds the message sequence number to the wireless ringing signal,
Since the same message serial number is added to the same radio paging signal for the same receiving terminal 200, the receiving terminal 200
However, it is not necessary to compare all message data as in the conventional case, and it is possible to efficiently reject duplicate received data by simply comparing message sequence numbers.

[0009] Preferably, the base station 100 adds the message sequence number to the address code part of the radio call signal. In general, the address code section is located at the front of the radio call signal, so that the receiving terminal 200 can perform message sequence number comparison / determination processing at an early point. Also preferably, the base station 10
0 adds the message sequence number to the message code part of the radio call signal. If the message sequence number is added to the message code part, the address code part can be widened, and as many receiving terminals can be accommodated.

Further, preferably, when the receiving terminal 200 receives the radio call signal of the same message sequence number within a predetermined time, it does not perform the incoming operation thereafter. In Figure 1, the receiving terminal 200 a message sequence number 1-3 and message data A~C of each radio calling signals A~C received at time t ₁ ~t _3, respectively the memory with each reception time t ₁ ~t ₃ Remember. Further, when at time t ₄ for receiving radio calling signals A message sequence number 1, the previous time t ₁ In this example dating back a predetermined time in the past from the time t _4, since the same message sequence number 1 is present, After that, the incoming operation of the message code part is not performed.

At time t₁The receiving terminal 200 is
I am moving out of the service area and a message for this
If the wireless ringing signal A with serial number 1 cannot be received,
Tick t _FourThe wireless ringing signal A of message serial number 1 in
It is remembered by Mori. Therefore, the reception failure of the wireless ringing signal
Also few. Thus, according to the present invention, the receiving terminal 20
With 0, only the message sequence numbers need to be compared, so the message
Quick and reliable duplication regardless of the size of sage data
Can stop the message receiving operation, especially portable receiving terminal
It is also advantageous from the aspect of saving reception power consumption required for
It

[0012]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Note that the same reference numerals indicate the same or corresponding parts throughout the drawings. FIG. 2 is a diagram showing the configuration of the radio paging system of the embodiment. FIG. 2A shows the configuration of the base station 100 of the embodiment. In the figure, 10 is a public network, 20 is an end station (EO) connected to the public network 10, and T.
E is a terminal (telephone or the like) accommodated in the terminal station 20, 30 is a call control unit in the base station 100 connected to the terminal station 20, 31 is a serial interface (SIF) connecting the terminal station 20 and the call control unit 30. ) And 32 are main controls of the call control unit 30.
A CPU for processing 33 is a ROM for storing various programs executed by the CPU 32, a call request from the terminal station 20, wireless call data generated based on the call request, and the like.
A memory (MEM) including a RAM, and 34 is the base station 100.
Non-volatile EEPROM storing various contract information related to the accommodated wireless terminals, 35 is a transmission control unit that simultaneously transmits the generated wireless call data to a plurality of remote wireless transmission stations, 36 is a common bus of the CPU 32, 40 ₁ to 40 ₃ are, for example, FS based on the radio call data for the carrier of frequency f _1.
It is a transmitting station that performs K modulation and transmits to each wireless service area simultaneously.

When there is a call request from the terminal station 20, the SIF 31 issues an interrupt request to the CPU 32. The CPU 32 that has received the request fetches the call request message from the terminal station 20, distributes it to each receiving terminal, and pools it in the memory 33 together with the reception time information fetched from the real-time clock means (not shown). Furthermore, based on the pooled call request message, a new (preferably sequential) management is made for each receiving terminal by referring to the EEPROM 34 to generate wireless calling data composed of the address number of the receiving terminal and message data. Add message serial number.

On the other hand, the call request message pooled in the memory 33 has already been sent to the receiving terminal,
After that, a certain time (for example, 30 minutes) or more has passed, and
In some cases, a predetermined time (for example, 4 hours) has not elapsed since the first transmission. With respect to such a call request message, the CPU 32 again refers to the EEPROM 34 if necessary, generates radio call data including the address number of the receiving terminal and the message data, and adds the message serial number to the radio call data. However, in this case, the same message sequence number is added to the same radio call data for the same receiving terminal.

Thus, each radio for a plurality of receiving terminals
Define a series of radio call frame data consisting of call data
It is generated in a timely manner and is sent to a plurality of transmissions via the transmission control unit 35.
Trust 40₁~ 40₃Send to all at once. In that case, send
The signal control unit 35 controls the necessary bit synchronization signal and frame synchronization.
Insert signals etc., and also message serial number, address number
Error correction code for signal and message data
Each transmitting station 40₁~ 40 ₃Send to all at once.

FIG. 2B shows the configuration of the receiving terminal 200 of the embodiment. In the figure, 50 is a receiving unit, 51 is a receiving control unit for performing intermittent reception control in the receiving unit 50, which will be described later,
Reference numeral 52 is a receiving circuit section (RF section) that receives and amplifies a radio wave of frequency f ₁ and converts it into a predetermined intermediate frequency signal, and 53 is a demodulation section that FSK demodulates the intermediate frequency signal and reproduces digital radio call frame data. (DEM), 61 is the receiving terminal 2
CPU for performing main control and processing of 00, 62 is a memory (MEM) including ROM and RAM used by the CPU 61, 6
2 ₁ reception table for storing in time series the incoming messages addressed to, real time clock circuit 63 for generating various registration information stored in that nonvolatile EEPROM, 64 are real-time information about subscribers (RTC) , 65 is a common bus of the CPU 61, 70 is an operation panel section operated by a subscriber, 71 is a liquid crystal display section (LCD) thereof, 72 is a speaker, 73 is a light emitting diode (LED), and 74 is a switch including a push button switch or the like. It is a department.

Here, the EEPROM 63 is the receiving terminal 2
00 address data is stored in the receiving terminal 200.
When the power is turned on, the CPU 61 reads the address data from the EEPROM 63 and sets it in the reception control unit 51. FIG. 3 is a timing chart of the radio paging system of the embodiment. FIG. 3A shows a frame format in the wireless section of the embodiment. In this example, the POCSAG format which is a standard of the Ministry of Posts and Telecommunications is used.

In the POCSAG format, a preamble for establishing bit synchronization is transmitted at the beginning of a frame, and then a synchronization code SC for establishing frame synchronization is sent.
Send (Sync Code). In each section from the subsequent time slot to, message data can be transmitted to the receiving terminal. In the time slots, A is the address code part of the receiving terminal, M is the message code part, and I is the idle code part inserted when there is no address or message.

Thus, after the transmission of the first time slot ~, the next synchronization code SC and time slot ~
To continue sending. Then, such frame transmission is continued for, for example, 40 seconds, then rested for 10 seconds, and frame transmission is performed again. In such a radio calling system, assuming that there are a total of 80 receiving terminals 200 to be accommodated,
8 groups of 10 units (time slots)
In each group, a specific receiving terminal 200 can be selected by an address code.

Each receiving terminal 200 receives only the address code portion A of a predetermined time slot, compares the received address data with its own address data, and if a match is found, continues. The message code part M is received. Next, an outline of the receiving operation of an example of this embodiment using the POCSAG system will be briefly described.

A receiving terminal 2 belonging to a time slot
The reception control unit 51 of 00 independently establishes bit synchronization and frame synchronization at a frame timing of a, and in the subsequent time slot, the reception unit 50 (RF unit 52 and DEM).
Some of the essential functions such as 53) are left, other functions are deactivated, the reception power consumption in the section is minimized, and the already established bit synchronization and frame synchronization are maintained.

In the subsequent time slot, the receiving section 50 is activated again, and the reception control section 51 checks whether the address code A matches. In this example, since an address match is obtained, an interrupt request IRQ is issued to the CPU 61, and the CPU 61 that accepts the request fetches the message sequence number and compares it with the message sequence number of a previously received message. In this example, since the message sequence numbers do not match, the CPU 61 does not issue the reception stop command. As a result, the reception control unit 51 continues the reception operation according to the normal reception protocol, and in this example, continues the reception operation.
One message code part M is continuously received. After that, the receiver 50 is deactivated again, and the next synchronization code S
In C, frame synchronization is reestablished. Further, since the next time slot is the idle code part I, the incoming operation is not performed.

Further, at a frame timing of a certain b after an arbitrary time has passed, bit synchronization and frame synchronization are established in the same manner as above. Further, although an address match can be obtained in that time slot, in this example, the message sequence number matches the message sequence number of a previously received message, so that the incoming operation is stopped midway. Therefore, duplicate reception of the same message is effectively avoided, and power consumption in the receiving unit 50 is also saved.

FIG. 3B shows the data format of the address code part and the message code part of the embodiment. One time slot in this embodiment comprises a 32-bit address code part and a 32-bit message code part. Here, FLG is a flag bit for synchronizing each code part, FNC is a function code for identifying various functions, BCH is a BCH code for error correction,
PAR is a parity bit for error checking.

In this example, since the message serial number is added to the address code portion A, there is an advantage that the message serial numbers can be compared at an early point of the message receiving operation. A message sequence number may be added to the back side (LSB side) of the address data. FIG. 3C shows the data format of the address code part and the message code part of another embodiment.

In this example, the front side of the message data (MS
The message serial number is added to (B side). Therefore, the address code part A can use full bits for data address data, and thus can accommodate more receiving terminals in one group. FIG. 4 is a control flowchart of the receiving terminal of the embodiment. In the following description, please also refer to FIG. 5 showing an example of the storage of the reception table 62 ₁ .

When the reception control unit 51 obtains a match of the address data and at least receives the message sequence number, it is input to this reception interrupt process. In step S1, the current time is read from the RTC 64 and the register t
Store at. Further, the message serial number is taken out from the received data and stored in the register n. Further, step S2
Then, the latest table index number C is read from the register C which holds the latest table number for the reception table 62 ₁ , and the contents are stored in the index register I.

In step S3, the "reception time" column referred to by the register I of the reception table 62 ₁ is read and stored in the register T. Also, the column of “message serial number” referred to by the register I of the reception table 62 ₁ is read and stored in the register N. In step S4, (t-T)>
It is determined whether or not ΔT. That is, the time from the reception time of the latest message in the past to the current time is a predetermined time ΔT (for example, 4
Time) is determined.

When (t−T)> ΔT, the base station 100 no longer sends a message having the same serial number, and therefore it can be determined that this is a received message having a new message serial number. In this case, the process proceeds to step S5 and the register C
+1 to the contents of. That is, the latest table number C is updated. In step S6, the current time t is written in the "reception time" column indexed by the register C of the reception table 62 ₁ , and the message sequence number n is written in the "message sequence number" column.

In step S7, the received message data is continuously written in the column of "message data" to be indexed by the register C of the reception table 62 _{1. In} step S8, the above process is repeated until the reception is completed. Eventually, when the reception is completed, the process proceeds to step S9, the message data including the time t is displayed on the liquid crystal display unit 71, the LED 73 is turned on (or blinks), and the speaker 72 is sounded.

Further, in the determination of step S4, (t-
If T)> ΔT is not satisfied, the base station may send a message having the same serial number. In this case, step S
In step 10, it is determined whether N = n. That is, the message serial numbers of the reception table and the received message are compared. If N = n, duplicate reception is performed, so step S
At 11, a reception stop command is issued to the reception control unit 51. Receiving this, the reception control unit 51 stops (inactivates) the incoming operation of the RF unit 52 and the demodulation unit 53, and enters the intermittent reception mode.

When N = n is not satisfied, step S12
Then, the content of the register I is updated to the time immediately before the latest, and the process returns to step S3. Thus, reception table 6
If the same message sequence number exists before the contents of 2 ₁ are traced back 4 hours in the past, the current reception action is stopped. If there is no same message sequence number, the current reception action is continued and the contents are received. Record in a new column of table 62 ₁ .

FIG. 5 shows an example of storage of the reception table of the embodiment. In each row of index numbers 0 to 3 of the reception table 62 ₁ , “reception time”, “message sequence number”, and “message data” of each reception message received in the past are pooled in time series. The register C points to the index number (3 in this example) in which the latest received data in the past is stored, and when recording a new received message, the content is incremented by one. Note that this reception table 6
The memory size of 2 ₁ is finite, and when recording a new received message with C = Q, the received message has C = 0.
Recorded in.

On the other hand, the index register I has I = 0.
If it still does not exceed 4 hours after going back to I, it will be updated to I = Q. Therefore, the present invention can be effectively realized even with the reception table 62 ₁ having a relatively small memory capacity. Although only the time information is used in the above-mentioned embodiment, it is obvious that the time information may include date information, and these may be integrated to be used as the time information.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various changes in configuration and control can be made without departing from the spirit of the present invention.

[0036]

As described above, according to the present invention, it is possible to quickly and surely reject the same radio call signal transmitted a plurality of times in this type of radio call system with a simple configuration and control. Become. Moreover, it is not necessary to receive all of the same wireless ringing signals, which is advantageous in terms of saving power consumption.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a diagram showing a configuration of a radio paging system according to an embodiment.

FIG. 3 is a timing chart of the radio paging system according to the embodiment.

FIG. 4 is a control flowchart of the receiving terminal of the embodiment.

FIG. 5 is a diagram showing a storage example of a reception table according to the embodiment.

[Explanation of symbols]

 100 base station 200 receiving terminal

Claims (4)

[Claims] 1. A radio call signal including an address code section and a message code section is generated in response to a call request to a subscriber, and the same radio call signal for one call request is wirelessly transmitted a plurality of times within a predetermined time. In a radio paging system including a base station and a receiving terminal that receives a radio paging signal from the base station, performs incoming processing of the contents addressed to itself, and outputs the base station, while adding a message sequence number to the radio paging signal, A radio calling system characterized by adding the same message sequence number to the same radio calling signal for the same receiving terminal. 2. The radio paging system according to claim 1, wherein the base station adds a message sequence number to an address code portion of the radio paging signal. 3. The radio paging system according to claim 1, wherein the base station adds a message serial number to the message code portion of the radio paging signal. 4. The radio paging system according to claim 1, wherein when the receiving terminal receives the radio paging signal having the same message sequence number within a predetermined time, it does not perform the incoming call operation thereafter.