JPH03117230A - Mobile radio equipment - Google Patents

Abstract

PURPOSE:To effectively execute the selection of an incoming control channel and to reduce the operation disable time by providing a history memory and a frequency of use memory and controlling a frequency synthesizer based on the storage content of the frequency of use memory. CONSTITUTION:A history memory 7 and a frequency of use memory 8 are provided as a frequency of use means storing the frequency of use of an incoming control channel used in the past and a selection control means controlling a frequency synthesizer 3 based on the storage content of the memory 8 is provided to a control section 4. When a mobile radio equipment 10 decides a standby channel at application of power, the control section 4 refers to a number (P6, P7 or the like) of the incoming control channel used in the past written in a standby channel table in the memory 7 already. Then the received electric field level is measured, written in a level order memory 6 in the larger order and the propriety of the operation of the channel is in the written order. Since the channel with high reception possibility is quickly selected, the channel selection is effectively executed and the operation disable time of a radio equipment 10 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is applied to wireless communications. In particular, it relates to the selection of an incoming control channel in a mobile radio.

The present invention selects one of a plurality of incoming call control channels and performs incoming call processing in accordance with the incoming call control signal received via that channel, in which the incoming call control channel is selected according to the frequency of use in the past. This reduces the unusable time associated with selection of an incoming control channel.

[Conventional technology]

In a mobile communication system, such as a car phone system, in which multiple radio channels are shared by a large number of mobile radios, an incoming call control channel is set up separately from the speech channel to control incoming calls to the mobile radio, and the incoming call is routed through this incoming control channel. A method is used in which the base station sends an incoming call control signal to the mobile station.

Here, the case of the car telephone system will be explained as an example.

In the car telephone system, a plurality of base stations are arranged within a service zone, and each base station sends out a call control signal via a call control channel assigned to the base stations so as not to interfere with each other. A mobile radio selects one of a plurality of incoming call control channels assigned to it, and performs incoming call control in accordance with the incoming call control signal received via that channel.

When the mobile radio is powered on, it sequentially receives unique incoming control channels (P channels, plural) stored in advance, measures the received electric field level of each, and writes them into memory in descending order of the level. This written content is called a P channel table.

When the mobile radio has finished measuring the reception levels of all stored incoming control channels, the mobile radio measures the incoming control channel stored first in the P-channel table, that is, the channel with the highest reception level.
Determine whether the mobile radio device can be used. If available, the incoming call control channel enters a state of waiting for incoming calls; if not, it is determined whether the next incoming control channel in the P channel table can be used. In this way, the available incoming call control channel with the highest reception level is captured, and a standby state is established in which calls can be made and received.

The purpose of determining whether or not an incoming control channel can be used is to exclude channels with large fluctuations in reception level due to fading and channels with a lot of noise. To check for fluctuations in the reception level, measure the reception level again and check whether the level exceeds the reference level. By performing level measurement in two stages in this manner, highly accurate level measurement can be performed in a relatively short time.

The incoming control channel selection operation is also performed when the mobile radio moves beyond the incoming control zone or when moving from a place where it cannot receive radio waves of the incoming control channel to a place where it can receive them.

[Problem to be solved by the invention]

However, with this incoming control channel selection method, the problem is that the more incoming control channels stored in the mobile radio, the longer it takes to enter the standby state, making it impossible to use the device immediately after turning on the power. was there. Furthermore, even if the power is simply turned off without transitioning between incoming control zones, the next time the power is turned on, all memorized incoming control channels will be monitored, which has the disadvantage of wasting control of the mobile radio. Ta.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a mobile radio device that can effectively select an incoming control channel and shorten unusable time.

[Means to solve the problem]

The mobile radio of the present invention includes a usage frequency storage means for storing the frequency of use of incoming call control channels used in the past, and a selection control means for controlling selection of the incoming call control channel based on the stored contents of the usage frequency storage means. It is characterized by having the following.

[For production]

By storing the frequency of use of incoming call control channels used in the past, channels that are likely to be received by the mobile radio are stored. By referring to this and selecting an incoming control channel, the unusable time associated with channel selection can be shortened.

〔Example〕

FIG. 1 is a block diagram of a mobile radio device according to an embodiment of the present invention.

This mobile radio device includes a transmitting/receiving section 1 that communicates with a base station via a communication channel, a transmitting/receiving section 2 including a microphone, a speaker, and a dial button, and selecting a communication channel to be used by the transmitting/receiving section 1. frequency synthesizer 3
Equipped with. The frequency synthesizer 3 includes means for selecting one of a plurality of incoming call control channels provided separately from the communication channel, and the transmitting/receiving unit 1 connects to the base station via the incoming call control channel selected by the frequency synthesizer 3. A control section 4, a P channel memory 5, and a level order memory 6 are provided as a call reception control means for controlling reception according to the reception signal from the transmitting/receiving section 1. P-channel memory 5 is a read-only memory that stores the incoming control channel uniquely assigned to the mobile radio. The level order memory 6 is a random access memory and stores the numbers of incoming control channels in descending order of reception level.

Here, the feature of this embodiment is that it is provided with a history memory 7 and a frequency memory 8 as usage frequency storage means for storing the usage frequency of the incoming call control channel used in the past. This is because the control section 4 is provided with a selection control means for controlling the frequency synthesizer 3.

FIG. 2 is a diagram showing how the mobile radio device is used.

Here, when the mobile radio device 10 moves within the termination control zone 21 of the base station 11 using the termination control channel P6 and within the termination control zone 22 of the base station 12 using the termination control channel P7, the control The operation of section 4 will be explained.

When the power is initially turned on, for example, when using the mobile radio device 10 for the first time, or when replacing the read-only memory (P channel memory 5) that stores information unique to the mobile radio device 10, the control unit 4 , the signals of the unique incoming control channels (for example channels with channel numbers P1 to P9) stored in the P channel memory 5 are received in order, the received electric field levels are measured, and the channel numbers are assigned in descending order of the level. is written into the level order memory 6. This written content is called a P channel table. P channel・
An example of the table is shown in FIG.

Once the received electric field levels have been measured for all incoming control channels stored in the P channel memory 5, the next step is to select the channel stored first in the level order memory 6, that is, the channel with the highest received level. It is determined whether the channel can be used by the mobile radio device 10. If available, the mobile radio 10 is placed on standby for incoming calls on its incoming call control channel. If unusable, it is similarly determined whether the next reception channel in the level order memory 6 can be used.

When the incoming call control channel to be waited on is determined, the control unit 4
The channel numbers are sequentially written into the history memory 7.

The stored contents of the history memory 7 are called a channel table. An example of a channel table for standby is shown in FIG. The standby channel table is the mobile radio 10.
It is retained even when the power is turned off. The standby channel table is set so that, for example, a maximum of several tens of channel numbers can be stored.

Thereafter, each time the control unit 4 shifts the incoming call control zone and changes the standby incoming control channel, the control unit 4 shifts the table number by 1 and changes the number of that incoming control channel to the standby channel table in the history memory 7. write to. If the set number of channels have been written, return to the first table number and write. That is, when writing has been completed in the area of table number 1, writing is performed in the next area of table number 2, and when writing has been completed in the area of the last number, the next writing starts from the first area.

Furthermore, every time the incoming control channel is changed and the writing of the new incoming control channel to the standby channel table is completed, the control unit 4 updates the incoming control channel number and the number of times stored in this table. The numbers of the winter wear habituation control channels are checked and written into the frequency memory 8 in descending order of the number of times they have been written. The contents of the frequency memory 8 are called a frequency table. An example of the standby frequency table is shown in FIG.

FIG. 6 shows the relationship between the stored contents of the standby channel table and the standby frequency table. Figure 6 (
a) is the state when the incoming control channel P6 is selected at the time of initial power-on, (C) is the state when the incoming control channels P7 and P6 are selected in that order, (S)
In the end, P6 5 times, P7 2 times, P5 1 time, P4
The state when is selected three times is shown.

When the incoming call control channel P6 is selected at initial power-on, the control unit 4 writes P6 into the area of table number 1 in both the standby channel table and the standby frequency table.

If another incoming call control channel number 7 is selected subsequently, P7 is added to the area of table number 2 for both the standby channel table and the standby frequency table.
Write.

When the previously selected incoming control channel P6 is selected again, the standby mode writes the channel table as is with the table number shifted, but the standby mode writes the frequency (P6 twice, P7 twice, etc.) to the frequency table. Write P6 and P7 in descending order of the number of times (1 time).

The writing progresses, and the standby state is P6 in the channel table.
P7, P6, P5, P6, P7, P4, P4, P6, P
6. When written to P4, P6 is written 5 times, P7 is written 2 times,
Since P5 has been written once and P4 has been written three times, P6, P4, P7, and P5 are written in the order of standby in the frequency table.

Next, a method for determining the channel on which the mobile radio device 10 will be on standby when the power is turned on will be described.

When the number of the incoming control channel is already written in the standby frequency table, the control unit 4 uses the standby channel number in the frequency memory 8 instead of the P channel memory 5 in order to create a P channel table. Browse the table. That is, the standby measures the received electric field level for the incoming control channel written in the frequency table,
The data is written into the level order memory 6 in descending order of the level.

Next, it is determined whether the incoming control channel can be used in the order in which it is written in the level order memory 6. Therefore, the standby channel can be selected without receiving a large number of pre-stored incoming control channels as in the conventional case.

In the case of standby, there may be cases where neither the incoming call control channels nor the channels stored in the frequency table can satisfy the specified reception level. At that time, the reception level of the incoming call control channels stored in the P channel memory 5 is compared to determine the standby channel, similar to when the power is initially turned on.

The above operations are also performed when the mobile radio moves and the incoming call control zone in which it is located shifts, or when it moves from a place where it cannot receive radio waves of the incoming call control channel to a place where it can receive them.

〔Effect of the invention〕

As explained above, the mobile radio device of the present invention measures and stores the usage frequency of the incoming control channel, so that when selecting the incoming control channel, it is possible to quickly select a channel with a high possibility of receiving the incoming control channel. It has the effect of

Furthermore, by shortening the selection time of the incoming call control channel, there is an effect that the unusable time of the mobile radio device is reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a mobile radio device according to an embodiment of the present invention. FIG. 2 is a diagram showing how the mobile radio is used. FIG. 3 is a diagram showing an example of a P channel table. FIG. 4 is a diagram showing an example of a standby channel table. FIG. 5 is a diagram showing an example of a standby frequency table. FIG. 6 is a diagram showing the relationship between the stored contents of the standby channel table and the standby frequency table.

Claims (1)

[Claims] 1. Means for selecting one of a plurality of incoming call control channels provided separately from communication channels, and an incoming call control signal from a base station via the incoming call control channel selected by this means. a mobile radio device comprising a means for receiving a signal, and an incoming call control means for controlling incoming calls in accordance with a received signal of the receiving means, a use frequency storage means for storing the frequency of use of a previously used incoming control channel; A mobile wireless device characterized by comprising: selection control means for controlling the selection means based on the content stored in the usage frequency storage means.