JPS6042949A - Idle channel search system - Google Patents

Abstract

PURPOSE:To eliminate inconvenience where connecting time is made longer by reducing the period of idle decision when the number of idle channels stored in a storage means is reduced to improve the probability where connection is attained by one channel selection when busy state is detected. CONSTITUTION:A master equipment 1 controls the oscillating state of a synthesizer 14 by a control circuit 17, changes over a reception channel frequency of a receiver 12 within a prescribed time at the standby state, thereby setting alternately the idle deciding period of talking channels S1, S2, S3 and S4 and the supervising period of a connection control channel C. When the channel S2 is decided to be busy at the idle channel supervising period at the standby state, the master equipment 1 does not store the number information of the said channel S2 and transits to the supervising operation of the connection control channel C succeedingly. Then the supervising period of the connection control channel C is reduced to a half of the conventional period, i.e., 1sec to execute supervising operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a channel/channel search method for a wireless telephone device to which a multi-channel access method is applied.

[Technical landscape of invention]

In recent years, in wireless telephone devices such as cordless telephone devices, which consist of a set consisting of a parent device and a wireless telephone that are paired with each other, multiple common A device using a so-called multi-channel access system has been proposed, in which a person owns a wireless line and selects an empty channel from the wireless line to make a call.

Conventional methods for searching for empty channels in such devices include the following, for example. Figure fJfJ1 is a timing diagram showing the time allocation. That is, first, the connection control channel C between the parent device and the wireless telephone
For example, every time the channel is monitored for 2 seconds, one empty channel is monitored (0.3 seconds). This empty channel monitoring is carried out on the last monitoring operation line for any multiple channels among all call channels. 1'41, for example, the oldest channel of S4, which is determined to be empty, is selected sequentially and these channels S1
, ~S4 are repeated, and if the channel is blocked, another channel is newly monitored. Note that the hatched period in the figure is the time required for channel switching, and is, for example, 1 second.

Here, the channel numbers that are determined to be blocked by the above-mentioned false channel monitoring are stored in the memory in order. At this time, if the other new character channels mentioned above are to be stored, their memory @ll'i: The original channel number has been deleted. Therefore, the memory VC is the newest 4
One call channel number is always stored on the VC.

In addition, if an incoming or outgoing call is detected on any connection control channel in this state, the latest empty channel among the four empty channels stored in the memory is selected, and all confirmations are confirmed. After doing this, the call using this Michiaki channel will begin. For example, when a call is made during the period shown in FIG. 2, channel S3, which was determined to be empty in the previous empty channel/channel monitoring period, is selected.

[Problems with background technology]

However, in the case of such a system, if it is determined that the empty channel S2 is blocked, and a call is made or received immediately after that in the connection control channel monitoring period B, the device will switch to the previous 11'l:Nit determination. Channel S
! Select and try to make a call on this channel. Therefore, the channel S1 selected at this time is
4. Since all the data was monitored 6 seconds ago,
When a call occurs in (2 seconds), the probability that the channel is available is lower than that of VC, and the probability of being able to connect with a single selection of an empty channel decreases. This probability decrease increases because, for example, if the immediately preceding channels S3 and S2 are both blocked as shown in the third diagram, channel Sl, which was fully monitored 7.1 seconds ago, will be selected. growing. In this way, the probability of being able to connect the first time decreases, and when the second or third channel selection is performed] λ2 unification is performed, the time required to connect is longer than when it is possible to connect the first time, and it also varies. This is undesirable because it causes discomfort to the user.

In addition, in the conventional search method, if the empty channel monitoring determines that the source is empty, that channel number is not stored in memory, so the next channel to replace the blocked channel is searched. Until the monitoring period arrives, at least the memory stores only free space for three channels. In addition, in the conventional method, when a block is detected, the next blockage is 9, and the channel that is determined to be blocked is monitored between 3 monitoring channels 111 and 9. This 1 instead of S2
Another channel SS, which was not being monitored as an empty channel, is translated into a J translation, and this channel S5 is then monitored.

Therefore, compared to the case of re-determining the availability of channel S2, which was determined to be 9 times blocked, the probability of detecting availability is higher.

However, even if the nitrogen channel S5 could be detected through such a search, as mentioned earlier, only empty channel numbers for three channels are stored in the memory for at least 10 seconds until this detection is made. There is nothing wrong with that. Furthermore, as shown in FIG. 3, the channel s2 of 9 is blocked twice in a row. When s3 occurs, only channel numbers for two channels are stored in the memory for at least 7.5 seconds. In this way, if a period in which only a small number of channel numbers are memorized continues for a long time, if a call is made or received during that time, the probability of being able to connect will be significantly reduced due to the small number of channels that can be used. I don't really like what you do.

[Objective of the Invention] The present invention increases the probability of being able to connect by selecting a channel once when a blockage is detected, thereby making it difficult to cause a problem in which multiple connection times become long, and reducing the memory of empty channels. It is an object of the present invention to provide an empty channel search method that shortens the period during which the number decreases and increases the probability of connection.

[Summary of the invention]

In order to achieve the above object, the present invention shortens the period of freeness determination when the number of free channels stored in the storage means decreases.

[Embodiments of the invention]

FIG. 4 is a block configuration diagram of a wireless telephone device to which an empty channel search method is applied in a simple embodiment of the present invention.
The radio telephones connected to the R device 1 via the respective radio telephones are shown.

The parent device 1 has a pair of transmitters 16 11 and receivers 16 12.
and connect these transmitters 11 and receivers 12 to the subscriber line 2.
an hybrid circuit 13, a synthesizer 14 that specifies the transmission and reception channels of the transmitter 11 and the receiver 12, and an empty determination circuit that determines whether or not the reception channel is active from the reception output of the receiver 12. 15, a storage circuit 16 for storing number information of channels determined to be vacant by the availability determination circuit 15, and a control circuit 17.

Here, the vacancy determination circuit 15 is configured to determine that the channel is vacant, for example, when the carrier level of the received signal is below a certain value. The storage circuit I6 is composed of a shift register that sequentially shifts and stores desired channel number information each time a vacant space is detected. Therefore, the register located at the input end of the shift register will always store the channel number information whose free space was determined last. Also 9
11] The control circuit 17 is equipped with a main control section consisting of, for example, a microprocessor, and is connected to the subscriber line 2 and the wireless telephone 3.
In addition to controlling the connection between the network and the network, it also performs various systems related to the search for vacant channels.

On the other hand, the radio telephone 3 includes a pair of transmitter 31 and receiver 32, a synthesizer 33 that specifies one channel of these transmitters 31 and receivers 32, and the operations of these transmitters 31, 32 and synthesizer 33. It is composed of a control circuit 34 and handsets 35 and 36. During standby, the control circuit 34 cuts off the power supply to the transmitter 31 and intermittently supplies power output to the receiver 32 and synthesizer 33 to perform intermittent reception operation using the connected control channel, and to avoid battery damage. Perform a saving action.

Next, the empty channel search method of this embodiment will be explained based on the above configuration. When the standby state is reached, the parent device I
In this case, the control circuit 17 controls the oscillation of the synthesizer 14 to switch the reception channel frequency of the receiver 12 within a certain period of time. The availability determination period for l+S4 and the monitoring period for connection control channel C are set alternately. Incidentally, the time widths of these 111 intervals S1, -S4, and C are respectively set to <0.3 seconds and 2.0 seconds, which are the same as in the case of FIGS. 1 to 3.

And the above call channel SL + 32 + S!
During the +84 vacancy determination period, the vacancy determination circuit 15 performs the vacancy determination, and if the channel is vacant, the corresponding channel number information is stored in the storage circuit 16, respectively. On the other hand, during the monitoring period of the close control channel C, the presence or absence of a call from the wireless telephone 3 is monitored.

In this state, for example, during the monitoring period of the connection control channel C shown in FIG. 1 reads the number information of channel S4, which was determined to be vacant last, from the storage circuit 16, and after confirming the availability of this closed channel, forms a communication path using this communication channel S4. On the other hand, if the above-mentioned call channel S4 is not vacant, the number information of the channel S3, which was determined to be vacant one time before, is read from the memory circuit 16, and after confirming its availability, the same call channel S3 is used. form.

Now, in the standby state, for example, if it is determined that channel 82 is blocked during the empty channel monitoring period shown in FIG. The process moves to the monitoring operation of the connection control channel C. Then, the monitoring period of this connection control channel C is shortened to the normal y2vc, zunainochi 1 second, and the monitoring operation is performed. Therefore, if a call is made from the wireless telephone 3 during this connection control channel monitoring period F, the master device 1 reads out the old communication channel SL that was determined to be empty in the previous empty channel monitoring from the storage circuit 16. A communication path will be formed, but since the monitoring period F of the connection control channel C has been shortened to 1 second,
The call channel S selected above is 3. (The judgment was made li seconds ago. Therefore, in the conventional case (Fig. 2) (
4, 6 seconds), the elapsed time after the desired determination is shortened by 1 second, and it becomes possible to use a channel with a high probability of being up to 1 in the commode.

Furthermore, if it is determined that the number of blocks is 9 in the empty channel monitoring (■), only the number information for 3 channels will be stored in the storage circuit 16 at least until the next empty channel monitoring period @ of this channel S2. . However, in this embodiment, since the monitoring period of the connection control channel C is shortened as described above, the period in which only number information for three channels is stored in the storage circuit 16 is shorter than the conventional one.
It is shortened from 0 seconds to 9.0 seconds.

Therefore, if a call is made or received during this period, the probability of connection increases.

In this way, with the search method of this embodiment, when an empty channel is determined to be a base in monitoring, the subsequent connection control channel monitoring period is shortened, and the period of empty channel monitoring is shortened. In the event of a call,
It is possible to select an empty channel and form a communication path using it while the probability that the channel is empty is as high as possible.This increases the probability of connecting after 91 channel selections, reducing the time required for connection. It is possible to reduce the amount of time and variation. Figure 7 shows the empty channel monitoring period ○.

This shows the case where 9 consecutive times are determined to be closed. In this case, the elapsed time after the latest empty channel Si is determined to be stuck when a call is made or received during the connection control channel monitoring period G can be suppressed to 5.1 seconds. The length of the piece 116 can be shortened by 2 seconds compared to the conventional method (7.1 seconds in FIG. 3). In addition, the time period Jν when the number of empty channels stored in the memory circuit 16 becomes 2 channels is 5.5 seconds as shown in FIG. 7, which is also conventional (7.5 seconds in FIG. 3). This is a reduction of 2 seconds compared to .

On the other hand, FIG. 8 shows an empty channel search method according to another embodiment of the present invention, and this search method is used when the number of empty channels stored in a storage circuit becomes 2 or less. The channel was supervised by 4M and VC was applied to shorten the cycle. In other words, when channels S2 and S3 are determined to be empty during the empty channel monitoring period [Yes], the following connection control channel monitoring period (G) is shortened, and the number of stored channels is equal to or greater than 3 channels. The monitoring period of the connection control channel C is shortened until the connection control channel C is restored. In this case, if the shortened connection control channel monitoring period is 0.4 seconds, the elapsed time after the call channel S1, which is selected when a call occurs during the connection control channel monitoring period ■, is determined to be free is 5.6 seconds. seconds.

Furthermore, the period in which the number of storage channels is only 2 channels is significantly shortened to 2.8 seconds.

In this way, shortening the empty channel monitoring period when the number of stored channels is less than 2 channels is as follows:
When the number of nitrogen channels is 2 or less, if one of them has a group of C, there is only one channel that can be used or it becomes O, which can easily cause problems with connection. This is particularly effective in avoiding.

FIG. 9 shows another example of centralization of the present invention. In this method, when channel s2 is determined to be blocked, during the connection control channel monitoring period until the next empty channel monitoring period In addition, a period (3) for monitoring another channel S5 is set, and as a result, the monitoring cycle of the empty channel is shortened. In this case, channel Sl
is the latest fw report, and the time is 3.35 seconds. Also,
Assuming that channel s5 is empty, the period during which the number of storage channels in the storage circuit is three channels is only 1.0 seconds, which is a significant reduction.

In addition, if the channel S5 is determined to have a fan of 9, for example, as shown in FIG. do.

It should be noted that the present invention is not limited to the example of the upper 6 pipes. For example, the number of channels to be stored in b1 is 1.
It may be. Furthermore, the shortened connection control channel monitoring period can be set arbitrarily.

Alternatively, the period of empty determination may be shortened by increasing the shortening amount each time the number of storage channels decreases by one number. In addition, the number of channels to be searched, the time period of the empty channel monitoring period, the configuration of the device, etc. can be modified in various ways without departing from the spirit of the present invention.

〔Effect of the invention〕

As described in detail above, according to the present invention, when the number of empty channels stored in the storage means decreases, the empty channel determination period is shortened, so that the base 9 is In some cases, it is possible to increase the probability of being able to connect with a single channel selection, which prevents the problem of long connection times, and shortens the period during which the number of empty channels stored is reduced, allowing connections to be made. It is possible to provide an empty channel search method that can increase the probability of

[Brief explanation of drawings]

Figures 1 to 3 are timing diagrams for explaining the conventional empty channel search method, Figures 4 to 7 show an embodiment of the present invention, and Figure 4 is the empty channel search method. 7 was applied. 1 is a timing diagram for explaining the empty channel search method, and FIGS. 8 to 10 are circuit block diagrams of the hexagonal telephone device, and FIGS. FIG. 3 is a timing diagram for explaining a channel search method. DESCRIPTION OF SYMBOLS 1... Parent device, 2... Subscriber line, 3... Radio telephone number 4, 15... Availability determination circuit, 16... Memory circuit,
17...Control circuit.

Claims (3)

[Claims] (1) A plurality of pairs of fixed devices and mobile devices are made to each have a plurality of common call channels and at least one connection control channel, and when a call is started for any set, other In a wireless telephone device that selects a set of unused communication channels to make a call, at least one of the fixed device and the mobile device includes an availability determination unit that repeatedly determines availability of an arbitrary communication channel based on the reception state of radio waves; A storage means for storing channel number information determined to be vacant by this means is provided, and each time the vacantity determining means determines that a certain number of communication channels are vacant, the connection control channel is monitored and a call is started. At times, the stored empty channel number information is read out in order from the one determined to be empty last and used as a call channel, and when the number of empty channels stored in the storage means decreases, the execution cycle of the empty channel determination is shortened. An empty channel search method characterized by the following. (2) Claim (1) characterized in that when the number of nitrogen channels stored in the storage means decreases to a predetermined number or less, the execution cycle of empty space determination is shortened. Empty channel search method described in section. (3) Each time the number of empty channels stored in the storage means decreases by a certain number, the execution cycle of the empty channel determination is shortened while increasing the amount of reduction. Empty channel search method described in ).