JP3266227B2 - Wireless 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 radio telephone device,
In particular, the present invention relates to a device using a plurality of control channels. The term "wireless telephone device" as used herein refers to a telephone device having a wireless base station connected to a telephone line and a mobile station that is in communication with the wireless base station according to a communication channel designated by a control channel, and is a so-called cordless telephone. And mobile phones. Here, the telephone line is not limited to a so-called public line, but includes a telephone line by a private network, for example, a private telephone line.

[0002]

2. Description of the Related Art In a radio telephone apparatus as described above, a radio base station and a mobile station are placed in a communication state using a communication channel. The station first selects an empty channel from among a plurality of communication channels, transmits control data such as which channel the empty channel is to to the mobile station via the control channel, and sets the empty channel as the communication channel. Set. In the mobile station, a communication channel is set to the empty channel based on the control data transmitted from the radio base station.

Conversely, when a mobile station calls a radio base station (calling), a call signal is first supplied to the radio base station via a control channel. In response to this, the radio base station selects a vacant channel, transmits control data such as which channel is the vacant channel to the mobile station via the control channel, and sets a call channel to the vacant channel. Set. The mobile station sets a communication channel to the empty channel based on the control data transmitted from the base station.

As described above, in the wireless telephone device, control data and the like are transmitted between the base station and the mobile station at the time of calling or receiving a call via the control channel. However, if only one control channel is prepared, if a certain wireless telephone device uses the control channel, incoming / outgoing call control cannot be performed by another nearby wireless telephone device. Thus, in recent years, two control channels have been used.

[0005] For example, in the radio telephone apparatus disclosed in Japanese Patent Publication No. 6-18347, whether the radio base station performs the call processing or the mobile station performs the call processing, the first is first.
Of the second control channel is in use. If the control channel is in use, it is checked whether the second control channel is in use.

[0006]

[Problems to be solved by the invention]
In the wireless telephone device disclosed in Japanese Patent No. 8347, it is always checked whether the first control channel is in use. Therefore, when a plurality of wireless telephone devices commonly use the first and second control channels, a large number of wireless devices first check the use state of the first control channel. Occupancy increases. Therefore, in many wireless telephone devices, the use state of the first control channel is checked. However, it is being used and the use state of the second control channel is checked. As a result, it takes time to search for a free control channel, and it takes time to start a call.
Although two control channels are provided, there is a problem that two control channels cannot be effectively used.

[0007] It is an object of the present invention to provide a wireless telephone device that can effectively use a plurality of control channels.

[0008]

[0009]

[0010]

[0011]

According to a first aspect of the present invention, there is provided a wireless base station connected to a telephone line and a communication state with the wireless base station by a communication channel designated by any one of a plurality of control channels. Mobile station. The wireless base station includes: a base station-side storage unit that stores a control channel used at the time of the previous call from the telephone line; and the base station among the plurality of control channels at the time of the call from the telephone line. When the control channel other than the control channel stored in the side storage means is in a non-use state, a call processing means for performing a call processing for the mobile station using the control channel in the non-use state; Means for storing the control channel used for the processing in the base station-side storage means. The mobile station has a mobile station storage means for storing a control channel used when a previous call was made, and a control channel other than the control channel stored in the mobile station storage means for making a call. Is in a non-use state, the call processing means for calling the base station using the control channel in the non-use state, and the control channel used for the call processing is stored in the mobile station side storage means. Means for storing.

[0012] In a second aspect based on the first aspect , the incoming call processing means has a base station side use state checking means,
This is because when a control channel other than the control channel stored in the base station side storage means is in a non-use state, an incoming call process is performed, and when it is in a use state, it is checked whether another control channel is in a use state. I do. The mobile station side use state checking means has a mobile station side use state check means,
When a control channel other than the control channel stored in the mobile station side storage means is in a non-use state, a calling process is performed, and in the use state, it is checked whether another control channel is in a use state.

According to a third aspect , in the second aspect , two control channels are provided.

[0014] In a fourth aspect based on the first aspect, the three control channels are provided, and the incoming call processing means is a control channel other than the control channel stored in the base station side storage means. , A random number is generated, the control channel corresponding to the random number is checked whether it is in use, the incoming call processing is performed when the control channel is not in use, and the remaining control channels are used in the use state. Inspection, the call processing means generates a random number for a control channel other than the control channel stored in the mobile station side storage means, and checks whether the control channel corresponding to the random number is in a ready state. In the non-use state, call processing is performed, and in the use state, it is checked whether the remaining control channels are in the use state.

[0015]

[0016]

In the first and fourth inventions, in the radio base station, the channels other than the control channel used at the time of the last call from the telephone line and stored in the base station side storage means are set in the non-use state. Then, the incoming call processing means performs incoming call processing on the mobile station using this control channel.
At the same time, the control channel used for the incoming call processing is stored in the base station side storage means to prepare for the next inspection. Also, in the above mobile station, if a control channel other than the control channel used at the time of the previous call stored in the mobile station side storage means is in a non-use state, the call processing is performed using this channel. The means processes a call to the base station. At the same time, the control channel used for the calling process is stored in the mobile station side storage means to prepare for the next inspection.

In the second invention, the base station side use state checking means performs call processing when a control channel other than the control channel stored in the base station side storage means is in the non-use state, In the case of, it is checked whether the other control channel is in use, and the mobile station side use state check means also
When a control channel other than the control channel stored in the mobile station side storage means is in a non-use state, an incoming call process is performed. When the control channel is in a use state, it is checked whether another control channel is in a use state.

In the third aspect of the invention, when the number of control channels is two and another control channel different from the previously used channel is in use, another control channel (control channel stored in the storage means) is used. Check that the is in use.

[0020]

1 to 4 show a reference example of the present invention. The wireless telephone device 2 of this reference example has a wireless base station 4 and a mobile station 6, as shown in FIG. The radio base station 4
It is connected to a telephone line via a telephone exchange (not shown).

The radio base station 4 enters a communication state with the mobile station 6 via any available channel among a plurality of communication channels. As a premise of setting this communication state, in the case of an incoming call for calling the mobile station 6 side from the radio base station 4 side, control data such as which communication channel to use is transmitted from the radio base station 4 side to the mobile station 6 side. Send. In addition, mobile station 6
In the case of an outgoing call for calling the wireless base station 4 side, a call signal is first transmitted from the mobile station 6 to the base station 4, and control data such as which communication channel to use from the base station 4 in response to this is transmitted. Send In order to transmit such control data, a call signal, and the like, a control channel having a frequency different from the communication channel is used, and a plurality of, for example, two channels are used as the control channels.

The radio base station 4 has an antenna 7 and receives a signal of a communication channel or a control channel transmitted from the mobile station 6 by the antenna 7. The signal received by the antenna 7 is transmitted to the receiving unit 1 via the antenna duplexer 8.
0 is supplied. The receiving unit 10 includes a plurality of communication channels and two or more communication channels according to a local oscillation signal from the synthesizer 12.
One of the two control channels is selected, frequency-converted into a predetermined intermediate frequency signal, and supplied to the demodulation unit 14. Note that the synthesizer 12 determines the frequency of the local oscillation signal according to a signal from the CPU 13. The demodulation unit 14
The intermediate frequency signal is demodulated, and the demodulated signal is supplied to the CPU 13 and the exchange.

The transmission signal from the exchange or the control data from the CPU 13 is modulated by the modulator 16
The signal is supplied to the transmission unit 18, converted to a frequency of a communication channel or a control channel in accordance with a local oscillation signal from the synthesizer 12, supplied to the antenna 7 via the antenna duplexer 8, and then transmitted to the mobile station 6. Sent.

The mobile station 6 has an antenna 20 for receiving a control channel or communication channel signal from the radio base station 4, and supplies the received signal to a receiving unit 24 via an antenna duplexer 22. Is done. The receiving unit 24
One of a plurality of communication channels and two control channels is selected according to a local oscillation signal from the synthesizer 26, frequency-converted to a predetermined intermediate frequency signal, and supplied to a demodulation unit 28. The synthesizer 26 has a CP
The frequency of the local oscillation signal is determined according to the control signal from U30. The demodulation unit 28 demodulates the intermediate frequency signal and supplies it to the CPU 30 if it is control data, and supplies it to the speaker 34 after amplifying it by the amplifier 32 if it is a transmission signal from the base station 4.

The transmission signal picked up by the microphone 36 is supplied to the modulation section 40 after being amplified by the amplifier 38. Control data may be supplied from the CPU 30 to the modulation unit 40 in some cases. The modulation section 40 modulates the transmission signal or the control data and supplies it to the transmission section 42. Transmission section 4
2 converts the frequency in accordance with the local oscillation signal from the synthesizer 26, and
0 and then transmit to the radio base station 4. In addition,
The speaker 34 and the microphone 36 are attached to a handset (not shown).

FIG. 2 is a flowchart showing the processing performed by the CPU 13 of the base station 4. First, it is determined whether there is an incoming call from the exchange (step S2). If there is no incoming call (when the determination in step S2 is NO), the receiving channel is set to the first channel to check whether there is a call from the mobile station 6 side.
A signal is supplied to the synthesizer 12 so as to be used as a control channel (step S4).

Then, reception starts (step S6),
The signal from the demodulation unit 14 is carrier sensed (step S8). For example, it is determined whether a call signal is being transmitted on the first control channel. If there is no call (if the determination in step S8 is NO), the receiving channel is changed (step S10). In this case, the receiving channel is changed to the second control channel.

Subsequently, the signal from the demodulation unit 14 is subjected to carrier sensing (step S12). If there is no call on the changed control channel (step S
If the determination of No. 12 is no), the process returns to step S2.

If it is determined in step S8 or S12 that there is a call from the mobile station 6, a call response process is performed (step S14). In the call response process, for example, the CPU 13 supplies a signal to the synthesizer 12, sequentially changes the frequency of the local oscillation signal, and searches for a free channel among the communication channels.

Then, control data including a call response signal and a signal indicating a vacant channel on which a call is to be made is supplied to the modulator 16. And the synthesizer 12
, So that the control data can be transmitted on the control channel used by the mobile station 6. As a result, a call response and an instruction of a communication channel are issued to the mobile station 6. Following this, it controls the synthesizer 12 so that it can talk on the previously found free channel,
That is, the synthesizer 12 is controlled so that an empty channel is used as a communication channel.

Then, the mobile station 6 through the communication channel
When a channel switching signal is transmitted from the terminal, a call state is established. In this call state, when a call termination instruction signal is supplied from the exchange or the mobile station 6, the call termination processing is performed, and the process returns to step S2.

In step S2, if there is an incoming call from the exchange (if the determination in step S2 is YES), first, as shown in FIG. 3, in order to determine which of the first and second control channels to use, A random number is generated (step S16), and it is determined whether the generated random number is an even number (step S18).

If the generated random number is an even number (step S
18, the synthesizer 12 is controlled so that the receiving channel is, for example, the first control channel (step S20). If the random number is odd (if the determination in step S18 is no), the receiving channel is set. Is controlled as the second control channel (step S22).

Next, reception on the set first or second control channel is started (step S24), and carrier sensing is performed (step S26). If there is a carrier (if the determination in step S26 is YES), since the control channel is being used by another wireless telephone device, the reception channel is changed to the other control channel (step S28), and step S24 is performed. Return to

As described above, since the channel to be checked for the use state is determined by a random number, the same control channel can be used even if a large number of wireless telephone devices using the same control channel and the same communication channel are used simultaneously. Is less likely to be in use by many wireless telephone devices.

When an unused control channel is found (when the determination in step S26 is NO), an incoming call response process is performed (step S30). In the incoming call response process, the synthesizer 12 is controlled to sequentially change the receiving communication channel, and search for an empty channel based on the signal from the demodulation unit 14. An incoming call signal including data indicating the vacant channel searched is supplied to the modulation unit 16, and the synthesizer 12 is controlled so that the transmission frequency becomes the control channel searched earlier, and the control channel searched earlier is used. An incoming call signal is transmitted to the mobile station 6.

The demodulation unit 14 determines whether a call response signal is supplied from the mobile station 6 via the control channel searched earlier.
When the incoming call response signal is supplied, the synthesizer 12 is controlled so that the previously searched empty channel is used as the communication channel, and the mobile station 6 completes the switching via this communication channel. It checks whether the signal is supplied or not based on the signal of the demodulation unit 14. When the switching completion signal is supplied, the switching unit is connected to the demodulation unit 14 and the modulation unit 16, respectively, and the mobile station 6 is set in a communicable state.

Then, a ringer signal is transmitted to the mobile station 6 via the communication channel, and when an off-hook signal is supplied from the mobile station 6 via the communication channel, the mobile station 6 enters the communication state. This communication state is set until the end-of-call instruction signal is supplied from the exchange or the mobile station 6. When the end-of-call instruction signal is supplied, the end-of-call process is performed and the process returns to step S2.

FIG. 4 is a flowchart showing the processing in the CPU 30 of the mobile station 6, and it is determined whether there is a key input by operating a key switch (not shown) or an off-hook of the handset (step S32). If there is no key input or off-hook (when the determination in step S32 is NO), it is determined whether a predetermined time has elapsed (step S34). If the predetermined time has not elapsed (NO in step S34). If it is, return to step S32. That is, it waits for a key input or off-hook for a fixed time.

If there is no key input or off-hook within a predetermined period of time (if the determination in step S34 is yes), first, the reception channel is set to the first control channel in order to check whether there is an incoming call from the radio base station 4 side. (Step S
36). This is performed by the CPU 30 controlling the synthesizer 26 so that the frequency of the local oscillation signal corresponds to the first control channel.

Subsequently, the signal from the demodulation unit 28 is fetched and reception is started (step S38). And
Carrier sense is performed on the reception channel (step S40). For example, it is determined whether an incoming call signal has been received. If there is no incoming signal (step S40)
Is not determined), the receiving channel is changed (step S42), and carrier sense is performed again (step S4).
4). Even in this case, if there is no incoming call signal (if the determination in step S44 is NO), the process returns to step S32.

If it is determined in step S40 or S44 that there is an incoming call signal, an incoming call process is performed (step S46). As this incoming call processing, the communication channel included in the incoming call signal received on the previous receiving channel is stored. Then, it supplies an incoming response signal to the modulating section 40 so that the incoming response signal is transmitted to the radio base station 4 using the control channel on which the incoming signal has been transmitted earlier, and a local part of the synthesizer 42. Controls the frequency of the oscillation signal.

Next, in order to transmit a channel switching signal to the radio base station 4 via the communication channel, the channel switching signal is supplied to the modulator 40. When the handset goes off-hook after receiving the ringer signal from the wireless base station 4 via the call channel, the off-hook signal is transmitted via the call channel to enter a call state.
When the call is terminated from the mobile station 6 in this call state, a termination instruction signal is transmitted to the radio base station. Subsequent to this, or when a call termination instruction signal is transmitted from the wireless base station 4, the process returns to step S32.

If it is determined in step S32 that a key input or off-hook has been performed (if the determination in step S32 is yes), a random number is first generated for calling (step S48). It is determined whether this random number is an even number (step S50).
If the determination is 0, the reception channel is set to the first control channel (step S52). If the reception channel is odd (if the determination in step S50 is no), the reception channel is set to the second control channel (step S54). .

Subsequent to step S52 or S54, reception on the reception channel set in any of these steps is started (step S56), and carrier sensing is performed (step S58). If there is a carrier (if the determination in step S58 is YES), since the reception channel is being used in another wireless telephone device, the reception channel is changed to another control channel (step S60), and step S60 is performed. It returns to S56.

As described above, since the control channel for checking whether the channel is an empty channel is determined by a random number,
Even if a large number of wireless telephone devices using the same control channel and the same communication channel are used simultaneously, the probability that many wireless telephone devices are using the same channel is low.

As a result of the carrier sense in step S58, if it is determined that the set reception channel is not used (if the determination in step S58 is NO), a calling process is performed (step S62). In this call processing,
For example, an outgoing call signal is first transmitted to the base station 4 using a control channel that has been previously determined to be unused.
Subsequently, when a call response signal is transmitted from the radio base station 4 via the control channel, the synthesizer 12 is controlled so that a call can be made on the communication channel included in the call response signal. I do.

Then, a channel switching signal is transmitted to the radio base station 4 using the communication channel, and the communication state is set. When the call is terminated from the mobile station 6 in this call state, a termination instruction signal is transmitted to the radio base station. Subsequent to this, or when a call termination instruction signal is transmitted from the wireless base station 4, the process returns to step S32.

In one embodiment of the present invention, in order for the base station 4 to answer a call or for the mobile station 6 to make a call,
When a receiving channel is set, first, the state of a channel different from the previously used receiving channel is checked.

FIG. 5 is a flowchart showing only the parts of the processing performed by the CPU 13 of the base station 2 in this embodiment that are different from those of the first embodiment. That is, when there is an incoming call from the exchange in step S2, the content of the memory storing the control channel used last time is read (step S64), and a control channel different from the content of this memory is set as the reception channel (step S66). .

Then, reception starts on this reception channel (step S68), and it is determined whether this reception channel is in use (step S70). If the receiving channel is in use (if the determination in step S70 is YES), the receiving channel is changed (step S7).
2) Return to step S68.

When the receiving channel is not used (when the judgment in step S70 is NO), the receiving channel is stored in the memory (step S74). This storage is used the next time step S64 is executed. Following step S74, an incoming call response is made (step S76).
This incoming call response is the same as that in step S30.

The mobile station 6 also replaces steps S48 to S62 shown in FIG. 4 with step S6 shown in FIG.
4 to S76 are executed. However, instead of the incoming call response in step S76, a calling process similar to step S62 is performed. As described above, since it is first checked whether the control channel is different from the control channel used last time, it is highly likely that an unused control channel is found immediately.

In the above-mentioned reference example and embodiment, the number of control channels is two, but the number of channels may be two or more. For example, in the case of using three channels, it is checked whether a certain channel is in use by random numbers as in the reference example, and if it is determined that it is in use, the remaining two channels are used in a predetermined order. , Or a random number may be generated for the remaining two channels, and the channel to be tested for use may be determined based on the random number.

In the above embodiment, when three channels are used , for example, a random number is generated for channels other than the previously used channel, and it is checked whether the channel corresponding to the random number is in use. If this channel is busy, it may check if another channel is busy.

Further, in the above-mentioned reference examples and embodiments, when it is checked whether the reception channel is in use for the call response processing in the base station or the call reception processing in the mobile station, the first control channel is set to the first control channel. Inspection is performed in a predetermined order such that the second control channel is inspected when it is in use. However, the inspection order may be determined by a random number.

[0057]

[0058]

[0059]

[0060]

According to the first and fourth aspects of the present invention , the incoming call processing means and the outgoing call processing means, when a control control channel different from the previously used control channel is in a non-use state, this non-use state. Since the control channel in the state is used, even if the control channel is commonly used by a plurality of wireless telephone devices, the probability that the same control channel is in use at the same time is reduced, and a plurality of control channels are used. Can be used effectively.

According to the second aspect of the present invention, the use state checking means included in the incoming call processing means and the outgoing call processing means checks whether a control channel different from that used last time is in use, If it is in use, it checks whether another control channel is in use, so even if a control channel different from the one used last time is in use, there is little waiting time and the probability that incoming and outgoing calls can be processed. And a plurality of control channels can be used effectively.

According to the third aspect of the present invention , the number of control channels is two. If a control channel different from the one used last time is in a non-use state, the control channel is used. Since the use status of the control channel different from the control channel used last time, that is, the control channel used last time is checked, the incoming call and the outgoing call processing can be performed with a short waiting time even if the control channel different from the last use is used. The probability is high and two control channels can be used effectively.

[Brief description of the drawings]

FIG. 1 is a block diagram of a reference example of a wireless telephone device according to the present invention.

FIG. 2 is a flowchart showing a part of the operation of the CPU on the wireless base station side of the reference example.

FIG. 3 is a flowchart showing the remaining part of the operation of the CPU on the wireless base station side of the reference example.

FIG. 4 is a flowchart showing the operation of the mobile station CPU of the reference example.

FIG. 5 is a flowchart showing a part of the operation of the CPU on the wireless base station side of the wireless telephone device according to one embodiment of the present invention;

[Explanation of symbols]

2 Radiotelephone device 4 Base station 6 Mobile station 7 20 Antenna 10 24 Receiving unit 12 26 Synthesizer 13 30 CPU (storage means, call processing means, call processing means)

Claims (4)

(57) [Claims] 1. A wireless base station connected to a telephone line, and a mobile station in communication with the wireless base station via a communication channel designated by any one of a plurality of control channels, The station comprises: a base station storage means for storing a control channel used at the time of the previous call from the telephone line; and a base station storage means of the plurality of control channels at the time of the call from the telephone line. Call control means for performing a call process for the mobile station using the control channel in the non-use state when a control channel other than the control channel stored in the call channel is in a non-use state; Means for storing said control channel in said base station-side storage means, wherein said mobile station stores a control channel used when a previous call was made. When a control channel other than the control channel stored in the mobile station side storage unit is in a non-use state when a call is made, a call is made to the base station using the non-use state control channel. A wireless telephone device comprising: a call processing means for processing; and means for storing the control channel used for the call processing in the mobile station side storage means. 2. The wireless telephone device according to claim 1, wherein
The incoming call processing means has a base station side use state checking means, which performs an incoming call process when a control channel other than the control channel stored in the base station side storage means is in a non-use state. In the use state, it is checked whether another control channel is in use state, and the mobile station side use state inspection means has a mobile station side use state inspection means, which is stored in the mobile station side storage means. A wireless telephone device for performing a call process when a control channel other than a stored control channel is in a non-use state, and checking whether another control channel is in a use state when the control channel is in a use state. 3. The wireless telephone device according to claim 2, wherein
A wireless telephone device comprising two control channels. 4. The wireless telephone device according to claim 1, wherein
Three control channels are provided, and the incoming call processing means generates a random number for a control channel other than the control channel stored in the base station side storage means, and generates a control channel corresponding to the random number. Is checked if it is in use, and if it is not in use, it performs incoming call processing. If it is in use, it checks whether the remaining control channels are in use. A random number is generated for a control channel other than the control channel stored in, a check is performed to determine whether the control channel corresponding to the random number is in the idle state, and when not in use, a call process is performed. A radiotelephone device that checks when the remaining control channels are in use.