JP3221992B2 - Digital radio telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital radio telephone apparatus for directly communicating between slave units.

[0002]

2. Description of the Related Art In recent years, digital radio telephones (PH)
P) has come to be able to directly communicate between child devices without going through a parent device.

[0003] In the case of direct communication between slave units, the calling slave unit monitors a frequency and a reception slot used in its own communication before performing a call operation to the other party's called side slave unit. If the frequency / slot is a frequency / slot already used in another communication, the other frequency / slot must be determined while avoiding use of the frequency / slot in the own communication. To determine whether another communication is using the frequency / slot, measure the reception level (interference wave level) of the frequency / reception slot, and if the measurement result is equal to or higher than the preset level value, check the frequency / slot. -It is determined that the slot has already been used by another communication.

Hereinafter, a process of determining a communication frequency / slot of a calling handset in direct communication between handsets of a conventional digital radio telephone (PHP) will be described with reference to FIG.

[0005] First, the calling handset sets the first frequency out of the ten frequencies that can be used for direct communication between handset units (step # 1), and all four reception slots within the first frequency are set. Is measured (step # 2). As a result of the measurement, if there is at least one receiving slot whose level is equal to or less than the preset level value (step # 3), it is determined that the own communication is possible at that frequency / slot, and the calling is permitted and the calling process is performed (step ##). 6) If there is no reception slot equal to or lower than the level value (step # 3), it is determined that communication is impossible at that frequency, and a frequency for measuring an interference wave level is next determined (step # 4). If there is no receiving slot equal to or less than the level value in the above-described determination processing, steps # 1 to #
If the frequency / slot that satisfies the above condition is not satisfied even after the measurement of all 10 waves is completed (step # 5), it is determined that the own communication is not possible at all frequencies, and the call is disabled (step #). 7).

[0006]

However, in the above-mentioned handset in the conventional digital radio telephone (PHP), the handset is located near the first frequency among the ten frequencies that can be used for direct communication between handset units. Assuming that the communication is skewed and, as shown in FIG. 4, for example, the second slot of the first frequency, the first slot and the third slot of the third frequency are already in use by another communication, the other Even if there is an unused frequency, there is a possibility that the first slot, the third slot, the fourth slot of the first frequency or the second slot and the fourth slot of the third frequency are selected and a call is made. is there. If the frequency / slot as described above is selected and determined, and a plurality of communications occur within the same frequency, the slaves between the communications are not synchronized. There is a problem that communication may cause interference gradually.

[0007] The present invention solves the above-mentioned problems, and enables communication to be evenly distributed to ten frequencies that can be used for direct communication between slave units, and makes the most effective use of these ten waves. Therefore, it is possible to reduce the probability that interference with other communications will occur during the communication of the terminal itself, and it is possible to prevent the maximum communication capacity in direct communication between slave units from decreasing compared to the conventional case. It is intended to provide a digital radio telephone (PHP).

[0008]

Means for Solving the Problems] digital wireless telephone system of the present invention for solving the above object, through a plurality of frequencies
And each frequency has multiple slots
A digital radio telephone system provided, a digital radio receiver for receiving radio signals, an antenna section for transmitting and receiving radio signals, measuring the interference wave at the time of call
After randomly determining the frequency to be measured first,
As a first process, the interference wave measurement of all the slots for each frequency is performed.
The interference wave level obtained by the
And a control unit for permitting a call at a lower frequency .

A digital radio telephone apparatus according to the present invention.
Is capable of communicating on multiple frequencies and at each frequency
Is a digital radio with multiple slots.
Talking device that receives digital signals
Line receiver and antenna for transmitting and receiving radio signals
At the time of calling, as the first processing, all slots for each frequency
The interference wave level obtained by the interference wave measurement
Control unit that allows outgoing calls at frequencies below the standard value
And a configuration including:

[0010]

According to the above configuration, when direct communication is performed between slave units, the control unit performs interference wave measurement from a frequency determined at random.

In this interference wave measurement, the control section performs, as a first process, the emission at the frequency at which the interference wave level obtained by the interference wave measurement for all slots for each frequency is equal to or lower than the level value in all slots. If the call is permitted and the call is not permitted on all frequencies in the first process, the second
As the processing of, the interference wave level obtained by the interference wave measurement of all slots for each frequency is allowed to make a call in the slot of the frequency that is equal to or less than the level value in at least one of the slots, In the processing of 2,
If the call is not permitted on all frequencies, the call in the communication is rejected and the slot used for the communication is determined.

As described above, the frequencies of slots used for communication are not biased, and all available frequencies are used effectively.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows components of a digital radio telephone (PHP) according to the present embodiment. Reference numeral 1 denotes an antenna unit having a function of transmitting / receiving a radio signal to / from a remote unit of a digital radio telephone (PHP). Reference numeral 2 denotes a digital wireless receiving unit having a function of receiving a digital wireless signal. Reference numeral 3 denotes a reception state detection unit which has a function of transmitting wireless state information such as the current electric field level or interference wave level of the wireless signal to the control unit. Reference numeral 4 denotes a control unit, which has functions of analyzing received data and analyzing a reception state, and performing control such as setting and changing the frequency of the digital wireless reception unit and changing the reception slot timing.

With respect to the slave unit of the digital radio telephone (PHP) comprising the above-described components, the relationship between the components and the operation will be described below. First, in the case of direct communication between slave units, the calling slave unit monitors the frequency / slot used in its own communication before performing a call operation to the called slave unit of the other party, and if the frequency If the slot is a frequency / slot already used in another communication, another frequency / slot must be determined while avoiding use of the frequency / slot in the own communication. Other communication
To determine whether or not a slot is used, the reception level of the frequency / slot (here, the interference wave level which is the intensity of the interference wave received from another communication) is measured, and as a result, the measured interference wave If the level is equal to or higher than a preset level value, it is determined that another communication is already used in that frequency / slot.

Hereinafter, referring to FIG. 2, in the digital radio telephone (PHP) of the present embodiment, when performing direct communication between the slave units, the communication is performed prior to the calling process of the calling side slave unit. The process of determining the frequency / slot to be used for the communication to be performed will be described.

As a first process, first, the calling handset randomly determines a frequency for measuring the interference wave level for the first time (step # 11). Next, the frequency is set (step # 12), and all the interference wave levels of the four reception slots within the frequency are measured (step # 13). As a result of the measurement, if the interference wave levels of all the reception slots are equal to or lower than a preset level value, there is no communication already in use at that frequency and all slots of this frequency can be used ( Hereafter, it is determined to be OK) (step # 14), and a call is permitted in the first slot of the frequency and a call process is performed (step # 22). However, if there is a receiving slot in which the interference wave level exceeds a preset level value in at least one of all the slots of this frequency, at least one communication already used in that frequency is used.
It is determined that all the slots of this frequency cannot be used (step # 14), and the next frequency for measuring the interference wave level is determined in order to search for a better frequency that has not used any communication yet. (Step # 15). During execution of the above processing, steps # 12 to # 15 are repeated until a slot permitted to make a call is determined, and the interference wave level is set within the frequency at which the interference wave level was measured by the first processing. If at least one reception slot exceeds the level value and a frequency that satisfies the above condition cannot be found even after the measurement has been completed for all frequencies (step # 16), it is used by direct communication between slave units. At all frequencies in the possible frequency bands, at least one communication at each frequency determines that the slot is already in use. In other words, it is determined that there is very much other communication in the surrounding area where the slave unit is located, and as a second process, the frequency returns to the frequency at which the interference wave level was measured for the first time. The frequency / slot that can be used in the own communication is searched by the determination method.

As a second process, first, the frequency at which the interference wave level was measured for the first time is set (step # 17), and the interference wave levels of all four reception slots within that frequency are measured (step # 18). . As a result, if there is at least one reception slot in which the measured interference wave level is equal to or less than a preset level value, there is still room for own communication within the frequency, and at least one slot must be used at this frequency. It is determined that the call is possible (step # 19), the call in that frequency / slot is permitted, and call processing is performed (step # 22). However, if there is no receiving slot whose interference wave level is equal to or less than the preset level value, there is no room for the communication at that frequency, and all slots of this frequency cannot be used (hereinafter abbreviated as NG). (Step # 19), and then a frequency for measuring the interference wave level is determined (step # 20). During execution of the above processing, steps # 17 to # 20 are repeated until a slot permitted to make a call is determined, and the interference wave level is set within the frequency at which the interference wave level was measured by the second processing. If there is no receiving slot whose level is equal to or less than the level value, and if a frequency satisfying the above condition cannot be found even after the measurement is completed for all frequencies (step # 21), the own communication can be entered in all the frequencies and slots. It is determined that there is no room at all, and the calling is disabled (step # 23).

By the above operation, the frequencies of the slots used for communication between the slave units can be evenly distributed, and all the available frequencies can be used effectively.
Therefore, it is possible to reduce the probability that interference with other communication will occur during the communication of the user, and to prevent the maximum communication capacity in the direct communication between the slaves from decreasing compared to the related art. .

[0019]

As described above, according to the present invention, when direct communication is performed between slave units, the control unit performs interference wave measurement from a frequency determined at random. In this interference wave measurement, the control unit performs, as a first process, a call at the frequency at which the interference wave level obtained by the interference wave measurement of all slots for each frequency is equal to or lower than the level value in all slots. In the first process, if the call is not permitted at all frequencies, as the second process, the interference wave level obtained by the interference wave measurement of all slots for each frequency is In the second process, if the calling is not permitted in all the frequencies in the second processing, the calling in the communication is not permitted. Permission is granted and the slot used for communication is determined. As described above, the frequencies of the used slots can be evenly distributed, and all the available frequencies can be used effectively. Therefore, it is possible to reduce the probability that interference with other communications will occur during the communication of the own device as compared with the related art, and furthermore, it is possible to prevent the maximum communication capacity in direct communication between the slave units from decreasing compared to the related art. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a slave unit of a digital wireless telephone device according to an embodiment of the present invention.

FIG. 2 is a flowchart of a calling process according to the embodiment;

FIG. 3 is a flowchart of a calling process of a conventional digital wireless telephone device.

FIG. 4 is a schematic diagram of a frequency and a slot of communication of the digital radio telephone device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna part 2 Digital radio reception part 3 Reception state detection part 4 Control part

Claims (4)

(57) [Claims] 1. A communication system capable of communicating with a plurality of frequencies, and
Digits with multiple slots at each frequency
A digital radio telephone device, a digital radio receiving unit for receiving a radio signal, an antenna unit for transmitting and receiving a radio signal, and an interference wave measurement at the time of calling.
After randomly determining the frequency to perform,
Interference obtained by interferometric measurements of all slots at each wave number
Oscillation at frequencies where the wave level is below the level in all slots
Digi <br/> barrel radiotelephone apparatus characterized by comprising a control unit for permitting the call. 2. Communication is possible at a plurality of frequencies, and
Digits with multiple slots at each frequency
Wireless radio telephone device that receives radio signals.
Digital radio receiver, for transmitting and receiving radio signals
At the time of calling, the antenna unit, as a first process, for each frequency
Wave level obtained by interference wave measurement for all slots
Allow calls on frequencies below the threshold in all slots
A digital radio telephone device comprising: 3. The control unit according to claim 1, wherein in the first process,
If the call is not permitted on all frequencies, the second processing
From the interference wave measurement of all slots for each frequency.
The interference level is at least one of all slots
Slot of the frequency that is less than or equal to the threshold value
Claim 1 characterized by permitting outgoing calls in lots.
A digital wireless telephone device according to claim 2.
Place. 4. The control unit according to claim 2, wherein in the second processing,
If a call is not allowed on all frequencies,
4. The method according to claim 3, wherein the outgoing call is determined to be rejected.
Digital radio telephone device.