JP2858694B2 - Receiver and transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Table of Contents] The present invention will be described in the following order.

BACKGROUND OF THE INVENTION Conventional Technology (FIG. 5) Problems to be Solved by the Invention Means for Solving the Problems (FIGS. 3 and 4) Function (FIGS. 3 and 4) Embodiment (1) One embodiment (FIGS. 1 and 2) (2) Second embodiment (FIG. 3) (3) Another embodiment (FIG. 4) Effect of the Invention

[0003]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver and a transmission device, and is preferably applied to, for example, a digital cordless telephone device.

[0004]

2. Description of the Related Art Conventionally, in a digital cordless telephone apparatus, a TDMA / TDD (Time
In some cases, a wireless line is connected by a division multiple access / time division duplex (plexing) system, and transmission and reception are performed by so-called ping-pong transmission in which a transmission slot and a reception slot are alternately repeated.

[0005] This kind of digital cordless telephone device is
The transmission and reception frequencies are configured to be the same frequency, and by using this, a direct call can be made between the slave units without passing through the master unit.

[0006] For a direct call between handset units, a carrier frequency dedicated to control is not provided. Therefore, as a multi-channel access method, a calling side handset unit has an available slot out of the call carrier frequencies. Is detected, and a call is made in the detected slot. (That is, a connection request signal is sent out at the detected empty slot.) On the other hand, the called-side slave unit intermittently receives a signal at a period T of, for example, 1.2 [sec] during standby, as shown in FIG.
At this time, for example, all 10 carrier frequencies are sequentially received at each intermittent reception (hereinafter, this is called a scan),
An incoming call (that is, a connection request signal) of a direct communication between slave units is detected. In this way, when the called handset detects an incoming call for direct calling between the handset, it connects the calling handset to the wireless line through a predetermined procedure.

Here, one intermittent reception requires 10 [msec] as the rise time t1 of the receiving section, a scan time per wave of 10 [msec], and a carrier frequency switching time of the slave unit of 1 [msec]. msec], the scan time t2 of all 10 waves is

[0008]

(Equation 1)

It takes time. As a result, the receiving unit uses the following equation for each intermittent reception.

[0010]

(Equation 2)

The operation is performed for the time of

[0012]

However, in this system, the intermittent reception ratio R1 indicating the ratio of the operation time of the receiver is used.
Is

[0013]

(Equation 3)

And it becomes higher. As a result, there is a problem that the power consumption of the battery during standby increases.

One way to solve this problem is to reduce the carrier frequency to be scanned from 10 waves to 3 waves by reducing the used carrier frequency from 10 waves to 3 waves. In this case, When there is a lot of traffic, there is a problem that it is difficult for the caller to find an empty slot.

A method of lengthening the period of intermittent reception is conceivable. In this case, the time required for the called party to respond becomes longer, and as a result, the time required for the calling side to hear the ringback tone becomes longer. There's a problem.

The present invention has been made in consideration of the above points, and has as its object to propose a receiver and a transmission device capable of reducing power consumption during standby.

[0018]

According to the present invention, there is provided a receiver for a transmission apparatus for selecting and communicating one of a plurality of communication waves having a plurality of frequencies. Therefore, when a connection request signal is transmitted from the calling side transmitter, the receiver switches to an operation state in which the connection request signal is detected and one communication wave is received. In a scan operation section generated intermittently in a scan cycle, intermittent reception means for receiving a communication wave of a plurality of frequencies and detecting a connection request signal, dividing the plurality of frequencies into first and second groups, and For each operating section, the frequency of the first or second group is
The intermittent receiving means is controlled so that the frequency of the first group is scanned more frequently than the frequency of the second group, whereby the frequency of the first group is transmitted from the calling side transmitter via a communication wave having many reception opportunities. Receiving control means for efficiently detecting the incoming connection request signal, and detecting the degree of congestion of a plurality of frequencies in the use environment, based on the detection result,
A congestion degree control means for changing a method of grouping a plurality of frequencies in the reception control means and / or a frequency of use of the group in a scan operation section is provided.

Further, according to the present invention, there is provided a transmission device for selecting one of communication waves of a plurality of frequencies and performing communication.
When a connection request signal is transmitted from a calling side transmitter by two communication waves, the called side receiver detects the connection request signal and switches to an operation state of receiving one communication wave. The calling transmitter transmits multiple frequencies,
A first group having a higher use priority and a second group having a lower use priority than the first group are divided, and the available frequencies are scanned in the order of the first and second groups to make a call. The receiving side receiver includes a transmitting unit, and in a call waiting state, an intermittent receiving a communication wave of a plurality of frequencies and detecting a connection request signal in a scanning operation section that occurs intermittently at a predetermined scanning cycle. The receiving means and the intermittent receiving means are controlled such that the frequency of the first group or the frequency of the second group is scanned more frequently than the frequency of the second group for each scanning operation section. This makes it possible to efficiently detect a connection request signal transmitted from a calling side transmitter via a communication wave having many reception opportunities, and a congestion of a plurality of frequencies in a use environment. Detects, based on the detection result, so providing a congestion control means for changing the frequency of use for Sukiyan operation period manner and or group of grouping a plurality of frequencies in the receiving control unit.

[0020]

When intermittently receiving during standby, the frequency to be received is divided into a first group having a high scan frequency and a second group having a low scan frequency and intermittently scanned in a scan operation section. The reception ratio can be reduced to shorten the reception operation at the time of standby, thereby reducing the power consumption at the time of standby while speeding up the responsiveness of the called side, and also providing a plurality of frequencies in the usage environment. By detecting the degree of congestion of the communication wave, and by changing the method of grouping a plurality of frequencies and / or the frequency of use of the divided groups in the scan operation section based on the detection result, the degree of congestion is reduced. Even if it changes, it is possible to easily connect the communication line.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

(1) First Embodiment In FIG. 1, reference numeral 1 designates a slave unit of a digital cordless telephone device as a whole, which is driven by a battery and has a radio unit 6
To generate a predetermined carrier frequency, and the master unit or another slave unit 1
And a wireless line based on the TDMA / TDD system.

The communication control unit 2 has a central processing unit (CP)
U), a memory, and the like, and have a function of transmitting and receiving various control signals. Thereby, for example, when off-hook information and dial information are input from the key input unit 3 to the communication control unit 2 via the man-machine interface unit 4, the slave unit 1 sends a connection request signal based on this information to the communication control unit. From 2, the signal is transmitted via the modem unit 5, the transmitting unit of the wireless unit 6, and the antenna 7 in this order, and the wireless line is connected to the called master unit or another slave unit 1 through a predetermined procedure. At this time, the dial information is output to the display unit 8 via the man-machine interface unit 4 and displayed on the display unit 8. Further, the display unit 8
In addition, various information such as battery remaining capacity information is displayed according to the situation.

When the communication control unit 2 receives the connection request signal via the antenna 7, the receiving unit of the radio unit 6 and the modem unit 5 in order during standby, the slave unit 1 performs a predetermined procedure on the calling side. A wireless line is connected to the device or another slave device 1.

Here, an analog audio signal taken in from a microphone (MIC) during a call is input to an ADPCM codec 9 and converted into a 32 [kbps] ADPCM (adaptive differential pulse code modulation) digital audio signal. . The digital audio signal is converted into a predetermined slot format in the communication control unit 2, and furthermore, the modem unit 5 and the radio unit 6
, And is modulated at a predetermined carrier frequency via the transmitting section, and transmitted from the antenna 7.

On the other hand, the received signal received by the antenna 7 during a call is demodulated into a digital audio signal via the receiving section of the radio section 6, the modem section 5, and the communication control section 2 in that order. The digital audio signal is converted into an analog audio signal in the ADPCM codec 9 and output to a receiver (RCV).

On the other hand, at the time of standby, as shown in FIG. 2, the slave unit 1 intermittently receives a cycle T of 1.2 [sec]. At this time, for example, the carrier frequency of 10 waves is divided into 5 waves, and all the carrier frequencies (ie, all slots) are scanned by two intermittent receptions. Thereby, the handset 1 detects an incoming call (that is, a connection request signal) of a direct communication between handset without a carrier frequency dedicated for control.

Here, one intermittent reception requires 10 [msec] as the rise time t1 of the receiving unit, the scan time per wave is 10 [msec], and the switching of the carrier frequency of the receiving unit is performed in the same manner as in the prior art. Assuming that the time is 1 [msec], the scan time t3 of five waves is given by the following equation:

[0029]

(Equation 4)

It takes time.

In the above configuration, when a direct call is made between the slave units, the calling slave unit 1 detects an empty slot from among the carrier frequencies for the call as in the prior art, and the detected slot is detected. Place a call in the slot.

On the other hand, the slave unit 1 on the called side intermittently receives a signal at a period T of 1.2 [sec] during standby. At this time, the called handset 1 divides the 10 carrier frequencies into 5 waves and scans all carrier frequencies in two cycles.
As a result, all the slots are scanned in two cycles of intermittent reception, and an incoming call (that is, a connection request signal) of a direct communication between the slave units can be detected. Thus, upon detecting the incoming call of the direct communication between the slave units, the called slave unit 1 connects the calling side slave unit 1 to the wireless line through a predetermined procedure.

In this case, a ringback tone is heard after the calling handset 1 sends a connection request signal until the called side handset 1 responds to the incoming call (that is, after the calling side makes a call). ) Is 0 to about 2.4 [sec], and the average response time is about 1.2 [sec].

In this method, the operation time of the receiving unit in one intermittent reception is expressed by the following equation.

[0035]

(Equation 5)

Thus, the operation time can be reduced from the conventional operation time of 120 [msec]. Also, as the intermittent reception ratio R2, the following equation is used.

[0037]

(Equation 6)

Thus, the ratio can be reduced to about half of the conventional intermittent reception ratio R1. As a result, 1
Since the operation time per intermittent reception is reduced, the power consumption of the battery during standby can be reduced.

In this system, all carrier frequencies are scanned at the time of intermittent reception, so that when a wireless line is connected in a place where there is a lot of traffic, the connection rate can be higher than in the conventional system in which the carrier frequency is reduced.

According to the above configuration, when all carrier frequencies are divided into two groups and intermittent reception is performed during standby, all carrier frequencies are scanned by two intermittent receptions, so that the intermittent reception ratio can be reduced. Thus, the power consumption of the battery at the time of standby can be reduced.

(2) Second Embodiment In this embodiment, as shown in FIG.
For intermittent reception at a cycle T of 2 [sec], for example, the carrier frequency of 10 waves is 4 waves of the first group (for example, 1,
3, 6, and 8 frequency channels) and a second group of 6 waves (for example, 2, 4, 5, 7, 9, and 10 frequency channels), and the first group of carrier frequencies occurs twice in three cycles. The carrier frequency of the second group is scanned once in three periods. That is, the slave 1
Performs scanning by weighting the carrier frequency. As a result, all carrier frequencies (ie, all slots) are scanned, and an incoming call of a direct telephone call between slave units, which does not have a dedicated carrier frequency for control, is detected.

Here, the intermittent reception in the sections A and B in which the four waves of the first group are scanned requires 10 [msec] as the rise time t1 of the receiving section as in the conventional case, and the scanning time per one wave is further reduced. Assuming that 10 [msec] and the carrier frequency switching time of the receiving unit is 1 [msec], a scan time t4 of four waves is expressed by the following equation.

[0043]

(Equation 7)

It takes time.

In the intermittent reception in the section C in which six waves of the second group are scanned, the reception section rise time t1 is set as
It takes 10 [msec], and as a scan time t5 of 6 waves,

[0046]

(Equation 8)

It takes time.

In the above configuration, when a direct telephone call is made between the slave units, the calling side slave unit 1 first carries out the carrier sense from the carrier frequency of the first group, and detects an empty slot. As a result, when an empty slot is detected, a call is made at the detected slot. When no empty slot is detected, the carrier frequency of the second group is sensed, and an empty slot is detected and a call is made.

On the other hand, the receiver 1 on the called side scans the carrier frequency of the first group twice every three periods and intermittently transmits the carrier frequency of the second group three times during intermittent reception during standby. Scan once every second. As a result, all slots are scanned by intermittent reception in three cycles, and an incoming call (that is, a connection request signal) of a direct communication between slave units can be detected. Thus, upon detecting the incoming call of the direct communication between the slave units, the called slave unit 1 connects the calling side slave unit 1 to the wireless line through a predetermined procedure.

In this case, the response time from when the calling handset 1 sends a connection request signal to when the called side handset 1 responds to the incoming call is the time when the call is made in the slot of the first group. In section A, 0 to about 1.2 [sec], and in section B to C, 0 to about 1.2 [sec].
About 2.4 [sec], the average response time is

[0051]

(Equation 9)

Is as follows.

Here, when the calling handset 1 makes a call using the slots of the second group (ie, when there are no empty slots in the weighted four carrier frequencies), the maximum response time is 3.6 [sec]. And the average response time is 1.8 [sec]. However, in the TDMA system, three slots can be used asynchronously per carrier frequency.
In general traffic, there is a low probability that there will be no empty slot in the carrier frequencies of the first group, and it is considered that there are no practical problems even if four weighted carrier frequencies are used.

In this system, when receiving the carrier frequency of the first group, the operation time of the receiving unit is expressed by the following equation.

[0055]

(Equation 10)

When receiving the carrier frequency of the second group, the operation time of the receiving unit is expressed by the following equation.

[0057]

[Equation 11]

The conventional operation time is 120 [ms], respectively.
ec]. Also, as the intermittent reception ratio R3, the following equation is used.

[0059]

(Equation 12)

Thus, the ratio can be reduced to about half of the conventional intermittent reception ratio R1. As a result, the power consumption of the battery during standby can be reduced as compared with the conventional method.

Further, in this system, all carrier frequencies are scanned, so that when a radio line is connected in a place where there is a lot of traffic, the connection rate can be made higher than in the conventional system in which the carrier frequency is reduced.

According to the above configuration, when all carrier frequencies are divided into groups and intermittent reception is performed during standby, by weighting and scanning the grouped carrier frequencies, the intermittent reception ratio can be reduced.
Thus, the power consumption of the battery at the time of standby can be reduced.

According to the above configuration, the carrier frequencies are divided into the first and second groups, and the first and second groups are set at the time of calling.
The carrier frequency is selected preferentially from the group and a call is made, and the receiving side intermittently receives the carrier frequency of the first group twice in three cycles by weighting. When a call is made at the carrier frequency of the first group, the average response time until the called party answers can be set to 1.0 [sec] as shown in equation (9). The responsiveness of the calling side can be accelerated.

(3) Other Embodiments In the above-described first embodiment, a case has been described in which ten carrier frequencies are divided into two frequency groups of five waves, but the present invention is not limited to this. For example, three waves, three waves, four
The frequency may be divided into three frequency groups. In short, one intermittent reception does not scan all carrier frequencies,
If all carrier frequencies are scanned by intermittent reception twice, the same effect as in the above case can be obtained.

Further, in the above-described second embodiment, the case where the carrier frequency of 10 waves is divided into four frequency groups and six frequency groups and the four frequency groups are weighted has been described. Not limited to this, the number of carrier frequencies in each frequency group, the combination of carrier frequencies, the number of frequency groups to be divided, and the weighting ratio may be variously selected, and may be varied according to the traffic of the environment where the slave unit is used. You may be able to.

A method of changing the grouping and the like according to the traffic (that is, the degree of congestion) of the use environment will be described with reference to FIG. Incidentally, the change processing shown in FIG. 4 is performed by the communication control unit 2 of the slave 1. Also in this case,
As in the second embodiment, first, channels 1, 3, 6, and 8 are used as a first group, and channels 2, 4, 5, 7, 9, and 10 are used as a second group. It is assumed that the weight is set larger.

The communication control unit 2 executes the change processing shown in FIG. 4 at a predetermined cycle during a standby state where no communication is performed. That is, step SP2 entered from step SP1
In, the communication control unit 2 checks the carrier frequency used when a direct call between slave units was previously made or the carrier frequency for which a connection request signal was received in the past. More specifically, in the slave 1, when a call is made in the past or an incoming call is detected in the past, the carrier frequency at that time is stored in a memory provided inside the communication control unit 2. The communication control unit 2 checks the carrier frequency usage by reading the carrier frequency stored in the memory.

[0068]

As described above, according to the present invention, upon intermittent reception during standby, the frequency to be received is divided into a first group having a high scan frequency and a second group having a low scan frequency. By performing intermittent scans in the operation section, the intermittent reception ratio is reduced and the reception operation during standby is shortened, whereby the responsiveness of the called side can be increased while suppressing power consumption during standby.

Also, at the time of waiting, the transmitter on the calling side divides the signal into a first group having a higher use priority and a second group having a lower use priority, and transmits the data. By scanning the first group more frequently than the second group, the responsiveness of the called party can be further increased while maintaining the effect of reducing the power consumption during standby.

If the current grouping and weighting are inappropriate, in step SP6, the communication control unit 2
Changes the current grouping and weighting based on the checked carrier frequency congestion degree. For example, when the carrier frequencies of channel 1 and 3 of the first group and the carrier frequencies of channel 2 and 4 of the second group are relatively used, the carrier frequencies of channels 1 to 4 are newly added to the first group. The remaining relatively unused carrier frequencies are newly added to the second group,
The new first group is weighted to give priority. For example, when the currently set second group is relatively used, the group is not re-divided, and only the weight is changed so that the second group is simply given priority.

In the next step SP7, the communication control unit 2
Stores the grouping and weighting determined in step SP6 in an internal memory. As a result, thereafter, the calling process or the incoming call detecting process is performed based on the newly determined grouping and weighting.

In this way, based on the carrier frequencies used in the past, the congestion degree of the carrier frequencies in the usage environment of the slave unit 1 is detected, and based on the detection result, the carrier frequencies are grouped and / or divided. By changing the weighting for the group, the grouping and / or weighting can be changed according to the change in the congestion degree of the carrier frequency. As a result, the calling side can quickly search for an available carrier frequency. In addition to this, the connection request signal can be quickly detected on the called side, and thus the communication line can be easily connected even when the congestion degree of the carrier frequency changes.

In the above-described embodiment, the case where the period T of the intermittent reception is set to 1.2 [sec] has been described. However, the present invention is not limited to this, and the period T may be set as long as the user does not feel uncomfortable. Can be selected to obtain the same effect as in the above-described case.

Further, in the above embodiment, the case where the present invention is applied to a digital cordless telephone device has been described.
The present invention is not limited to this, and one of a plurality of carrier frequencies may be used.
Even when the present invention is applied to various transmission apparatuses that perform communication by selecting one of them, the same effect as in the above-described case can be obtained.

[0075]

As described above, according to the present invention, when intermittent reception is performed during standby, the frequency to be received is divided and all frequencies are scanned in a plurality of receptions, thereby reducing the intermittent reception ratio. The receiving operation during standby can be shortened, and thus the power consumption during standby can be reduced.

Further, by intermittently receiving a frequency of a group having a large weight during standby with a high probability, it is possible to speed up the response of the called side.

Further, the degree of congestion is detected for communication waves of a plurality of frequencies in the use environment, and the method of grouping the plurality of frequencies and / or the frequency of use of the divided groups in the scan operation section are changed based on the detection result. By doing so, even if the congestion degree changes,
The communication line can be easily connected.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a slave unit of a digital cordless telephone device according to an embodiment of the present invention.

FIG. 2 is a timing chart for explaining the operation of the intermittent reception.

FIG. 3 is a timing chart for explaining an intermittent reception operation according to a second embodiment;

FIG. 4 is a flowchart showing a group and weight changing process according to another embodiment.

FIG. 5 is a timing chart showing conventional intermittent reception.

[Explanation of symbols]

1 ... slave unit, 2 ... communication control unit, 3 ... key input unit, 4
…… Man-machine interface section, 5 …… Modulation / demodulation section,
6: Radio section, 7: Antenna, 8: Display section, 9:
ADPCM codec.

Claims (2)

(57) [Claims] 1. A method of selecting one of communication waves of a plurality of frequencies to communicate.
A receiver of a transmitting device for transmitting, said one communication wave
A connection request signal is transmitted from the calling transmitter.
, The connection request signal is detected and the one communication wave is transmitted.
In the receiver that switches to the receiving operation state , intermittently at a predetermined scan cycle in the call waiting state
In the scan operation section that occurs, the plurality of frequencies
Intermittent reception of receiving the communication wave of
And dividing the plurality of frequencies into first and second groups,
For each scan operation section, the first or second group
Frequency of the first group is higher than that of the first group.
Scanned more frequently than the second group of frequencies
Control the intermittent receiving means so that the receiving
Often transmitted from the calling transmitter via a communication wave
To be able to detect the incoming connection request signal efficiently
Reception control means, detecting the degree of congestion of the plurality of frequencies in the use environment,
On the basis of the detection result,
The method of grouping multiple frequencies and / or
Change the frequency of use of the group for the above scan operation section
And a congestion degree control means . 2. The method of claim 1, wherein one of the communication waves having a plurality of frequencies is selected for communication.
A communication device for transmitting data by using the one communication wave.
Calling party when connection request signal is sent from calling transmitter
The receiver detects the connection request signal and
In a transmission device that switches to an operation state to receive communication waves
Te, the calling transmitter, the plurality of frequencies, the usage priority higher first group
And a second group having a lower use priority than the first group.
Divided into loops, and in the order of the first and second groups.
Includes transmission means for scanning available frequencies and calling
The receiving receiver intermittently intermittently operates in a predetermined scan cycle during the call waiting state.
In the scan operation section that occurs, the plurality of frequencies
Intermittent reception of receiving the communication wave of
Communication means and the first or second group for each scan operation section.
Frequency of the first group is higher than that of the first group.
Scanned more frequently than the second group of frequencies
Control the intermittent receiving means so that the receiving
Often transmitted from the calling transmitter via a communication wave
To be able to detect the incoming connection request signal efficiently
Reception control means, detecting the degree of congestion of the plurality of frequencies in the use environment,
On the basis of the detection result,
The method of grouping multiple frequencies and / or
Change the frequency of use of the group for the above scan operation section
Transmission device comprising congestion degree control means.
Place.