JPH02244827A - Wireless communication method - Google Patents

Abstract

PURPOSE:To eliminate waste time for answering back by dividing plural slave station groups into groups including a small number of slave stations, and calling the slave station by every group. CONSTITUTION:When an answer-back command is transmitted from a master station to all slave stations with a time slot T0 so as to reply by only the slave station group G1 in the slave stations 1-20, only the slave station 1 with the slave station group number G1 and the slave station 20 out of the slave stations 1-20 transmit answerback information to the master station with time slots T1 and T20. When the issuing of the answer-back command to the slave station group G1 is completed, no answer-back command is transmitted to the slave station group G2 since no slave station group requiring to call exists in the slave station group G2 of slave stations 21-40, and the answer-back command is issued to the slave station group G3 including the slave station to be called. In other words, no answer-back command is issued to the slave station group not including the slave station to be called. Thereby, a waste time slot can be reduced.

Description

[Detailed Description of the Invention] [Summary] Regarding a wireless communication system in which a master station collects various information from multiple slave stations based on an answerback command, the purpose of this invention is to eliminate unnecessary answerback time. A back command includes a slave station group number including a plurality of slave stations that need to be called when the plurality of slave stations are further divided into a plurality of slave stations, and each slave station is connected to the slave station group of the answerback command. When extracting the number and detecting that it is the own slave station group number, the answerback information is transmitted in the time slot assigned to the own station, or the slave station in the slave station group number related to the call is 1. When there is only one station, the answerback command includes the slave station group number and the number of the slave station, and each slave station receives the answerback command and sends the slave station group number and its own slave station number. The answer back information is configured to be transmitted in the first time slot when it is detected.

[Industrial application field]

The present invention relates to wireless communication systems, and particularly to wireless communication systems in which a master station collects various information from a plurality of slave stations in response to an answerback command.

In disaster prevention administrative radio digital cell call systems for municipalities, etc., an answerback command is sent from a master station to multiple slave stations, and the slave stations respond to this by sending various collected information to the master station. As the amount of information increases, there is a need to shorten the time required to collect information.

[Conventional technology]

In conventional wireless communication systems that collect various types of information using such answerback commands, if multiple slave stations respond simultaneously when collecting information, a collision of information collected by the slave stations will occur at the master station. To prevent this, it is necessary to stagger the transmission times between each slave station.

As shown in Japanese Unexamined Patent Publication No. 52-15590, the method is to allocate a time in advance to each slave station when transmitting a response, and the slave station that receives the selective call responds at that time. A method has been proposed in which the transmission 13 is increased.

That is, when one master station A collects information from 400 slave stations B as shown in FIG. 7, the answer-back time slot (TI-T4O0) of each slave station is allocated as shown in FIG.

Then, as shown in the time chart of Fig. 9, the master station A
When S issues an answerback command simultaneously to all slave stations by radio (time slot y), each slave station responds in the time slot previously assigned to it from the time S when the command is received. I do.

Therefore, slave station 1 responds at time slot Tl, slave station 2 responds at time slot T2, and slave station 400 transmits its collected information to master station A at time slot T400. do.

[Problem that the invention sought to solve]

In such a conventional wireless communication system, as shown in Fig. 7, only three stations, 1, 2 and 400, returned an answer/return. This requires answer-back time slots for stations 3 to 399, which has the problem that the more the number of slave stations increases, the more wasted answer-back time increases.

Therefore, an object of the present invention is to eliminate unnecessary answerback time in a wireless communication system in which a master station collects various information from a plurality of slave stations in response to an answerback command.

[F stage and operation for solving the problem] In the wireless communication system according to the present invention, as shown in FIG. 1, the slave stations 1 to 100 shown in FIG. ~G20
Divide into. Then, the master station side needs to know which slave stations to give an answerback command to, and in the example of FIG.
Answer back will be requested only for the following questions.

The present invention has the following three communication modes in such a case.

■'5 to 1 (7)% - 1'': This is a mode that is applied when there are multiple calling slave stations in the slave station group, and as shown in the time chart in Figure 2, the master station first When A sends an answer back command to all the slave stations in time slot TO so that only the slave stations 1 to 20 of the slave station group Gl respond, the slave stations 1 to 20 of the slave station group numbers Gl respond.
20, only the slave station 1 and the slave station 20 are assigned to the time slot T1. , and transmits answerback information to master station A at T2O.

When the answerback command to the slave station group G1 is completed, the answerback command is not sent to the slave station group G2 from slave stations 21 to 40 because there is no slave station group that needs to be called as described above. An answerback command is issued to the slave station group G3 that includes the called slave station.

In this way, wasted time slots can be reduced by not issuing an answerback command to a group of slave stations that does not include the calling slave station.

Furthermore, regarding slave station group G3, since only slave stations 42 and 43 receive the call, they respond in time slots T2 and T3 in slave station group G3 as shown in FIG. Since this slave station group G3 does not have it, when the master station A receives the answerback information from the slave station 43, it moves to the answerback command to the slave station group G20 to which the next called slave station 400 belongs. You can also do that.

Thereby, the time slots corresponding to the slave stations 44 to 60 in the slave station group G3 can be omitted.

■m25: This is a mode that is applied when there is only one called slave station in the slave station group, and the only slave station to be called in the slave station group G20 is the slave station 400. . Therefore, in this case, the answer back information is sent using the first time slot (TI) in the slave station group G20 without using all the time slots of the slave stations 380 to 400 in the slave station group G20.

As a result, only one of the 20 time slots in the slave station group needs to be used, reducing the number of time slots by 19.

Note that the above modes ↑ and ↑ may be commanded separately, or may be commanded in combination.

〔Example〕

FIG. 3 shows a schematic configuration of the master station side and the slave station side of the wireless communication system according to the present invention. The side consists of a receiver 13 and a data analysis section 14, and the transmitter 12
The selector switch 15 is switched by a control signal from the controller. In addition, the slave station 2 has a reception side consisting of a receiver 9121 and an answerback command analysis section 22, and a transmission side consisting of a signal generation section 23 and a transmitter 24. It's switching.

FIG. 4 shows the configuration of the answer command control unit 11 of the parent station, where 16 is a channel selection area storage unit that stores the child stations of each area, and 17 is a selection area storage unit 16 that stores slave stations based on the information in the channel selection area storage unit 16. The answer back command slave station group residual section 18 selects the slave station group to which it belongs and issues an answer back command to the slave station group. The signal frame has the format shown in Figure 5, where BS is a bit synchronization signal section, FS is a frame synchronization signal data section, and 5LCL is a selective call signal section for selectively calling each slave station. The code part corresponding to the slave station group number and individual slave station number, DATA has multiple codes inserted in the control part of the speaker open signal, call end signal and answerback command, and BCH has the redundant focus part. This is how the slave station signals are sent out.

FIG. 6 shows an embodiment of the answerback command analysis unit 22 of slave station B that analyzes commands from master station A.
32 is a slave station group number extraction unit that extracts a slave station group number from received data, and 32 is a slave station group that compares and determines whether or not the slave station group number of the own station is among the extracted slave station group numbers. A number comparison unit 33 is a slave station group number presetting unit in which the slave station group number of the local station is pre-sent and sends the data to the slave station group number comparison unit 32; 34 is an answerback flag that stores an answerback flag. A storage unit 35 extracts an answerback command from the data, reads an answerback flag from the answerback storage unit 34, and sends out an answer command. A control number analysis unit 36 is activated by the control number analysis unit 35 to perform an answerback. 37 is an answerback information collection unit that collects data to be sent back to the master station A;

Convert the Y-Yu collected by the information collection department into data food in order! 5 Answer back data setting section to manage, 3
Is 8 one? The timing generating section 39 of the server is an intra-slave station group individual signal briss node section that analyzes the answerback command and generates a time rJ7F corresponding to the individual slave station number.

Next, the operation of the slave station will be explained. When the W receiver 21 of one station receives the transmission signal from the master station A, the received data is sent to the answerback command analysis section 22 of the slave station. The received data enters the Y station group number extraction section 31 and the slave station group number analysis section 35, and the slave station group number extraction section 31 extracts the slave station group number from the manually inputted reception data. Slave station group number extraction unit 3
The slave station group number extracted in step 1 is sent to the slave station group number comparison section 32 and compared with the slave station group number of the own station stored in the slave station group number blisect section 33, and here it is determined that the two numbers match. Only when it is determined that the fi4m number analysis unit 35
send to The control signal analysis unit 357' determines whether the control number is an answerback command from the received data (1
, Furthermore, it is determined whether the answerback command is in the above-mentioned mode (■) or mode (2).

In mode ■, an answerback is returned at each time slot 7 +- that is not assigned to the individual station number stored in the slave station group individual number preset section 39 (see Figure 2). Time slot T1~ in case of Q1~20
T20), and if the mote is
1 Regardless of the status, there are fixed 4 time slots (the first time slot in the case of slave station 400 shown in Figure 2)
) to answer back.

Therefore, the w control number analysis unit 35 uses unserver 1. When it is determined whether the mode is mode ■ or mode ■, answer back flag memory is used to store a flag indicating that the local station was selected when there was a paging broadcast, in order to obtain the time o-7) that matches the mode command. A flag indicating whether the time slot corresponds to the individual slave station number at the time of the mode command or the fixed time slot at the time of the mode command is read out from the section 34, and if the flag is ON, the answerback report collection section 36 is activated. .

The answerback information collection section 36 collects data to be sent back to the master station A, and the collected data is assembled into a data frame format by the answerback data setting section 37. If the data from the control signal analyzer 35 is in the answerback mode ■, the answerback timing generator 38 generates the answerback data at a fixed time slot (TI in the case of the slave station 400 in FIG. 2). The data from the setting section 37 is sent to the signal generating section. In addition, in answer back mode ■, the time slot corresponding to the individual slave station number stored in the slave station group individual number preset section 39 (time slot TI-T20 in the case of slave stations l to 20 in FIG. ), the collected data from the answer back data setting section 37 is sent to the signal generating section 2.
Send to 3. The signal generator 23 transmits this data to the master station A via the transmitter 24.

〔Effect of the invention〕

As described above, according to the wireless communication system according to the present invention, a plurality of slave station groups are divided into groups containing a small number of slave stations, and the slave stations are called for each slave station group. When the answerback information from the station is divided into 20×20 groups of slave stations, each with a time slot of I sec, the time required for answerback can be reduced as follows.

A) When only the slave station 400 is called: (1) Conventional
1sec +400sec -401sec (2) Present invention 1sec + 1sec = 2sec a) Slave station I
When only called - (1) Conventional 1sec + 1sec = 2sec
(2) Invention 1sec + 1sec = 2sec) When calling slave station 1.2.21: (1) Conventional 1s
ec+1sec=22sec (2) Present invention 1sec
+2sec+1sec+]5ec=5sec In this way, the greater the number of slave stations, the greater the effect of time slot reduction.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram for explaining the principle of the wireless communication system according to the present invention, FIG. 2 is a time chart diagram for explaining the principle of the wireless communication system according to the present invention, and FIG. 3 is a system configuration diagram for explaining the principle of the wireless communication system according to the present invention. FIG. 4 is a block diagram showing the configuration of a master station and a slave station in the wireless communication system according to the present invention; FIG. , FIG. 5 is a diagram of the transmission frame format from the master station used in the present invention, and FIG. 6 is a block diagram showing an embodiment of the answerback old analysis unit of the slave station in the V4 line communication system according to the present invention. , FIG. 7 to FIG. 9 are diagrams for explaining the conventional system. In FIG. 1, A: master station, B: slave stations (slave stations 1 to 400), G1-G20: slave station group. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] (1) In a wireless communication system in which a master station collects various types of information from multiple slave stations based on an answerback command, the answerback command is used to control the number of calls when the multiple slave stations are further divided into multiple slave stations. Contains a slave station group number that includes the necessary multiple slave stations, and is assigned to each slave station when it extracts the slave station group number of the answer back command and detects that it is its own slave station group number. A wireless communication method characterized by transmitting answerback information in designated time slots. (2) The main station is characterized in that when it collects answerback information from a slave station related to the last call among a group of slave stations that need to be called, it issues an answerback command to the next group of slave stations. The wireless communication system according to claim 1. (3) When there is only one slave station among the slave station group numbers related to the call, the answerback command includes the slave station group number and the number of the slave station, and each slave station 2. The wireless communication system according to claim 1, wherein the answer back information is transmitted in the first time slot when the slave station group number and the own slave station number are detected upon receiving the back command.