JPH0775158A - Speaking channel setting method for mca system mobile communication - Google Patents

Abstract

PURPOSE:To prevent the overlapping of waiting idle channels at respective terminals and the interference of call connection by reading or generating a random number to perform access from an exchange or a main equipment to each terminal at the time of starting a system, and deciding a speaking channel to be initially accessed corresponding to the obtained random number at each terminal. CONSTITUTION:After a power source is turned on, at a master set 1 of a cordless telephone set, the generation of the random number at a random number arithmetic part 14 is started, and data reception from a private exchange 3 is waited. When a processing part 12 generates an interruption request to a main processor 10 corresponding to that data reception, with this interruption request as timing, the processor 10 reads the value of the random number generated by the arithmetic part 14, sets a speaking channel number corresponding to that value and decides whether that speaking channel is a dead channel or not. When it is the dead channel, it becomes waiting state and the carrier sense of the dead channel is performed. When it is occupied, the number of the next speaking channel is set and the carrier sense is performed again. Thus, the telephone numbers of speaking channels to be initially accessed by each cordless telephone set after turning on the power source are equally distributed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a MCA mobile communication channel setting method for setting a communication channel in a multi-channel access (MCA) mobile communication system.

The communication channel setting method of the present invention is, for example, M
It is suitable for application to a CA type cordless telephone. This MCA type cordless telephone is connected to a telecommunications carrier's office line or PBX extension line, and is an effective system when a large number of terminals are to be installed.

[0003]

2. Description of the Related Art In a curl cordless telephone or a system cordless telephone, a plurality of cordless telephones are M
The CA system shares a plurality of call channels to improve the use efficiency of the call channel (S channel). In the MCA method, the base unit of the cordless telephone periodically searches for an empty call channel during standby, and predetermines the call channel to be used when making or receiving a call. This free channel search is based on determining whether or not the call channel is used by accessing any call channel and performing carrier sense.
To prevent multiple base units from waiting on the same idle call channel, each base unit generates a random number individually and determines the call channel number to be accessed by free channel search based on that value. , The call channels accessed by each are evenly distributed over all the call channels.

[0004]

At present, it is general that cordless telephones are software-controlled by using a microprocessor. However, when a system is constructed with such cordless telephones, each cordless telephone in the system has the same control. It will operate using a program. Therefore, immediately after the system is turned on, all cordless telephones run the same control program at the same timing, and the timing of random number generation and the timing of access coincide with each other. The call channels have the same channel number, and the call channels on which the cordless telephones wait are all the same.

As a result, when a plurality of cordless telephones try to talk at the same time after the power is turned on, the call channels accessed by the cordless telephones overlap with each other, which may result in connection failure or interference. Similar phenomenon is likely to occur when the communication channel is biased other than immediately after the power is turned on.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent the idle idle channels of the terminals from overlapping immediately after the power is turned on.
It is to solve problems such as call connection failure and interference.

[0007]

FIG. 1 is a diagram illustrating the principle of the present invention. In order to solve the above-mentioned problems, in one aspect of the present invention, there is provided a call channel setting method for multi-channel access mobile communication, which determines a call channel to be accessed according to a generated random number and searches for a free channel. Therefore, each terminal reads the generated random number or starts the random number generation at the timing of accessing each terminal from the exchange or the main unit at the time of system startup,
There is provided a communication channel setting method for MCA mobile communication, wherein a communication channel to be initially accessed is determined according to the obtained random number.

According to another aspect of the present invention,
A multi-channel access method that determines the call channel to be accessed according to the generated random number and searches for a free channel.This is a call channel setting method for mobile communication, in which each terminal is a system based on the identification number of each terminal. Provided is a call channel setting method for MCA mobile communication, which determines a call channel to be initially accessed at startup.

In the above-mentioned communication channel setting method, a sequential number generated by a counter may be used instead of the random number.

[0010]

[Operation] Since each terminal runs on the same control program, simply using a random number will access the random number at the same timing after power-on (after system startup),
Unable to evenly distribute call channels for initial access. Therefore, by shifting the timing at which each terminal accesses the random number after the power is turned on, the call channels initially accessed are evenly distributed.

Therefore, when the system is started up, the generated random numbers are read (see FIG. 1) or the random number generation is started at the timing of accessing each terminal from the exchange or the main unit. Since the timing at which the exchange or the main unit accesses each terminal is deviated in time, eventually, the value of the random number acquired by each terminal becomes different, and the speech channel initially accessed is randomized.

In another embodiment of the present invention, based on the identification number given to each terminal, a predetermined operation is performed on the identification number to calculate a call channel, or a correspondence table between the identification number and the call channel is used. Then, the call channel to be initially accessed is determined in order to search for a free channel. Since the identification number of each terminal has a different value unique to each terminal, the obtained call channel also differs for each terminal, and thus the call channel initially accessed is randomized.

A sequential number generated by a counter may be used instead of the random number.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows an embodiment in which the call channel setting method for MCA type mobile communication of the present invention is applied to a cordless telephone system. In FIG. 2, reference numeral 1 is a base unit of the cordless telephone, 2 is a handset of the cordless telephone, and the base unit 1 and the handset 2 constitute a cordless telephone. The base unit 1 is housed in the extension terminal of the private branch exchange 3. The interfaces between the private branch exchange 3 and the base unit 1 are analog / digital, 2W /
It may be 4W. The master unit 1 and the slave unit 2 are connected by one wireless channel selected from a large number of wireless channels (frequency division channels).

Although only one cordless telephone (master unit 1 and slave unit 2) is shown in the figure for simplification of description, a plurality of cordless telephones (eight cordless telephones in this embodiment) are actually used. (# 0 to # 7) are accommodated in the private branch exchange 3, and each cordless telephone connects the base unit 1 and the handset 2 using a different radio channel from other cordless telephones.

The base unit 1 comprises a main processor 10, a voice control unit 11, a data transmission processing unit 12, an ID-ROM 13, a random number calculation unit 14, a radio unit 15, an antenna 16 and the like. The main processor 10 is a circuit for performing overall control of the master unit 1. The data transmission processing unit 12 is a circuit that sends and receives control data and the like to and from the private branch exchange 3, and issues an interrupt request IRQ to the main processor 10 based on the data. . ID-RO
M13 is a non-volatile memory that semi-permanently holds the ID number of the cordless telephone, and delivers the ID number in response to a request from the main processor 10. The random number operation unit 14 is a circuit that is activated by the main processor 10 to perform an operation for generating a random number, and passes the random number to the main processor 10 at an instruction timing. The random number calculation unit 14 may be replaced with a counter.

In this system, in the voice system, the transmission is from the slave unit 2 (microphone) to the master unit 1 (radio unit 15 to voice controller 1
1), the route is transmitted to the private branch exchange 3 (extension), and the reception is transmitted to the private branch exchange 3 (extension) → master unit 1 (voice control unit 11 → radio unit 15) → slave unit 2 (receiver). .
The transmission system serves as a route for transmission from the private branch exchange 3 (extension line) to the data transmission processing unit 12 of the parent device 1 to the main processor 10 of the parent device 1.

The operation of the system of this embodiment will be described below with reference to FIG.
This will be described with reference to FIG. Here, FIG. 3 is a diagram showing an operation flow of the embodiment system, and shows a sequence of operations in which the base unit 1 sets an idle call channel for standby while the cordless telephone is on standby. FIG. 4 is a time chart of the embodiment system. Each cordless telephone # 0 to #
7 shows the timing to access the random number.

In this cordless telephone system, immediately after the power is turned on, the private branch exchange 3 sets the cordless telephones # 0 to #.
Data is transmitted to the data transmission processing unit 12 of the base unit 1 in order to access the data such as the setting of initial data for No. 7, but this data transmission must be performed simultaneously for each cordless telephone # 0 to # 7. It is not possible to do so, and the time is staggered for each one. Cordless phones # 0 to #
In the base unit 1 of No. 7, when the data transmission processing unit 12 receives the data after the power is turned on, it issues an interrupt request IRQ to the main processor 10. The interrupt timing is the data transmission timing to each cordless telephone # 0 to # 7. Of course, each cordless phone # 0
# 7 will be different.

Therefore, in the base unit 1 of the cordless telephone,
After the power is turned on, first, the random number calculation unit 14 starts the generation of random numbers, waits for data reception from the private branch exchange 3, and if the data transmission processing unit 12 causes the main processor 10 to generate an interrupt request IRQ in response to the data reception. The main processor 10 is triggered by the interrupt request IRQ to access the random number calculation unit 14 to read the value of the generated random number, set the call channel number corresponding to the value of the random number, and set the call channel. Carrier sense is performed to determine whether or not there is an empty channel. When an empty channel is detected, the standby state is entered, and during the standby, carrier sensing of the empty channel is periodically performed. If the call channel is in use, the number of the next call channel (numbered or random) may be set and carrier sensing is performed again.

In this way, each cordless telephone #
Since the timings at which 0 to # 7 access the random numbers are different from each other, the call channel numbers initially accessed by the cordless telephones # 0 to # 7 immediately after power-on are evenly distributed over all the call channels. .

For example, in FIG. 4, the random number calculation result of "4" is read at the timing when the cordless telephone # 0 accesses the random number calculation section 14, and the cordless telephone # 1 is "7" and the cordless telephone # 2 is "10". , "13" ... Is read by the cordless telephone # 3, and "25" is read by the cordless telephone # 7. Therefore, since the cordless telephones # 0 to # 7 have different access timings to the random number calculation unit 14 even when the same program is executed, the initially set call channels are the cordless telephones # 0 to # 7. 7 will be different.

FIG. 5 and FIG. 6 show an embodiment of a call channel setting method according to another embodiment of the present invention. In this embodiment, the value of the random number obtained by each cordless telephone is made different by using the interrupt signal of the above-mentioned embodiment as a start signal for random number calculation, and the hardware configuration used is basically This is the same as the above-mentioned embodiment.

FIG. 5 is a diagram showing an operation flow of the embodiment system, and shows a sequence of operations in which the base unit 1 sets a standby communication channel while the cordless telephone is on standby. FIG. 6 is a time chart of the embodiment system, and shows the timing when each cordless telephone # 0 to # 7 accesses a random number.

In the cordless telephone system of this embodiment, the base unit 1 of each of the cordless telephones # 0 to # 7 resets the internal circuit immediately after the power is turned on. After that, when the data transmission processing unit 12 receives the data and issues an interrupt request IRQ to the main processor 10, the main processor 10 receives the request and activates the random number calculation unit 14 to start the generation of the random number. In this way, since the data transmission timings to the cordless telephones # 0 to # 7 are different, the start timings of random number generation in the cordless telephones # 0 to # 7 are also different.

When a certain time has passed after the power was turned on, the main processor 1 of the base unit 1 of each cordless telephone # 0 to # 7.
0 reads the value of the random number from the random number calculation unit 14. Since the start timing of random number generation in the cordless telephones # 0 to # 7 is different, the value of this random number is different in each cordless telephone # 0 to # 7. The main processor 10 sets the call channel number corresponding to the value of this random number and performs the above-mentioned empty channel search.

In this way, each cordless telephone #
Since the random number values obtained by 0 to # 7 are different, the numbers of the call channels that the cordless telephones # 0 to # 7 initially access immediately after the power is turned on are evenly distributed over all the call channels. Become.

For example, in FIG. 6, the timing at which the cordless telephone # 0 accesses the random number calculation unit 14 (the other cordless telephones # 1 to # 7 after a certain time has passed from the reset).
The same)) reads the random number calculation result of "26", and the cordless telephone # 1 has "23" and the cordless telephone #
2 is "20", cordless telephone # 3 is "17" ...
・, Cordless telephone # 7 reads “5” respectively. Therefore, since the cordless telephones # 0 to # 7 have different random number values even when they are executing the same program, the call channels initially set should be different between the cordless telephones # 0 to # 7. Become.

FIG. 7 shows an embodiment of a call channel setting method according to another embodiment of the present invention. This embodiment randomizes the call channel to be initially accessed based on the ID (identification number) unique to each cordless telephone, and the hardware configuration used is basically the same as that described above. It is the same as the embodiment. FIG. 7 is a diagram showing an operation flow of the system of the embodiment and shows a sequence of operations for setting a call channel for standby while the cordless telephone is on standby.

In the cordless telephone system of this embodiment, immediately after the power is turned on, the main processor 10 of the base unit 1 of each cordless telephone # 0 to # 7 reads the identification number from the ID-ROM 13 and identifies the identification number. Perform a predetermined operation that converts the number to a call channel number.
Since the identification numbers are all different among the cordless telephones # 0 to # 7, the results of applying the predetermined calculation to the cordless telephones also have different values, so that the number of the call channel to be initially accessed is also different in each cordless telephone # 0 to # 7. They are different and are evenly distributed over all speech channels.
When the number of the call channel to access initially is decided,
The main processor 10 searches for a free channel using the call channel number.

FIG. 8 shows an embodiment of a call channel setting method according to still another aspect of the present invention. This embodiment is a randomization method in which the identification number of each cordless telephone is used directly instead of being calculated as in the above-described embodiment to determine the call channel to be initially accessed, and is used. The hardware configuration is basically the same as that of the above-described embodiment.

That is, several bits or all bits of the identification number are associated with the call channel number. In the example of FIG. 8, in the system where the total number of call channels is about 90, the lower 3 bits D0 to D2 of the identification number. Calling channel values 01, 11, 21, 31, 51, 61,
71 and 81 are shown respectively.

In implementing the present invention, various modifications other than those described above are possible. For example, in the above-described embodiment, the base unit 1 determines the call channel to be initially accessed based on the identification number, but the handset 2 may be used to determine the call channel to be initially accessed based on the identification number. Although a random number is used to determine the communication channel in the above-described embodiment, a sequential number generated by a counter can be used instead of this random number. Further, although the case where the present invention is applied to the cordless telephone system has been described in the embodiments, the present invention is not limited to this, and another mobile communication system that determines the communication channel to be used by the multi-channel access method. Can also be generally applied to.

[0034]

As described above, according to the present invention, the call channel to be initially accessed is randomized immediately after the power is turned on and the bias is eliminated, so that a call connection failure or interference may occur. It is possible to prevent a defect from occurring.

[Brief description of drawings]

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

FIG. 2 is a diagram showing an embodiment in which the call channel setting method for MCA type mobile communication of the present invention is applied to a cordless telephone system.

FIG. 3 is a diagram showing an operation flow of setting a communication channel during standby in the embodiment system.

FIG. 4 is a time chart for explaining access timing to random numbers of each cordless telephone in the system of the embodiment.

FIG. 5 is a diagram showing an operation flow of call channel setting during standby in an embodiment of a call channel setting method according to another mode of the present invention.

FIG. 6 is a time chart explaining the access timing to random numbers of each cordless telephone in the embodiment of FIG.

FIG. 7 is a diagram showing an operation flow of call channel setting during standby in an embodiment of a call channel setting method according to still another embodiment of the present invention.

FIG. 8 is a diagram for explaining an embodiment of a call channel setting method according to still another mode of the present invention.

[Explanation of symbols]

 1 cordless telephone master unit 2 cordless telephone slave unit 3 private branch exchange 10 main processor 11 voice control unit 12 data transmission processing unit 13 ID-ROM 14 random number calculation unit 15 wireless unit 16 antenna

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyofumi Hayashi 1-21-1 Akebono-cho, Tachikawa-shi, Tokyo Inside Fujitsu ASC Ltd.

Claims (4)

[Claims] 1. A call channel setting method for mobile communication in a multi-channel access system, wherein a call channel to be accessed is determined according to a generated random number and a free channel is searched for, wherein each terminal is an exchange or a main unit at system startup. The MCA that reads the generated random number or starts the random number generation at the timing of accessing each terminal from the terminal and determines the communication channel to be initially accessed according to the obtained random number.
Method of setting communication channel for mobile communication. 2. A call channel setting method for multi-channel access mobile communication, wherein a call channel to be accessed is determined according to a generated random number and a free channel search is performed, wherein each terminal has an individual identification. A call channel setting method for MCA type mobile communication, wherein a call channel to be initially accessed is determined based on a number when the system is started up. 3. The communication channel setting method for MCA type mobile communication according to claim 1, wherein a sequential number generated by a counter is used instead of the random number. 4. A cordless telephone system using a cordless telephone as a terminal.
A method for setting a communication channel for MCA mobile communication as described.