JPH03117229A - Mobile radio equipment - Google Patents

Abstract

PURPOSE:To execute the selection of an incoming control channel effectively and to reduce the operation disable time by providing a selection control means controlling a history storage means and a means selecting an incoming control channel based on the storage content of the history storage means. CONSTITUTION:A history memory 7 is provided as a history storage means storing which incoming control channel is used in the past and a selection control means controlling a frequency synthesizer 3 based on the storage content of the memory 7 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 references 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 8 in the larger order and the propriety of the operation of the channel is decided 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 past usage history. 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 device of the present invention includes a history storage means for storing which incoming call control channel was 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 history storage means. It is characterized by:

[For production]

When incoming call control channels used in the past are stored, 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 includes a transmitting/receiving unit 1 that communicates with a base station via a communication channel, a transmitting/receiving unit 3 including a microphone, a speaker, and a dial button, and a communication channel that the transmitting/receiving unit 1 uses. 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 a history memory 7 is provided as a history storage means for storing which incoming call control channel was used in the past, and the frequency synthesizer 2 is controlled based on the stored contents of this history memory 7. The reason is that the control unit 4 is provided with a selection control means for selecting the desired value.

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

Here, when the mobile radio 10 moves within the call control zone 21 of the base station 11 using the call control channel 6 and within the call control zone 22 of the base station 12 using the call control channel 7, The operation of the control 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 memo IJ (P channel memory 5) that stores information unique to the mobile radio device 10, the control unit 4 receives the signals of the unique incoming control channels (for example, channels with channel numbers P1 to P9) stored in the P channel memory 5 in order, measures the received electric field level, and selects the channels in descending order of the level. Write the number 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 number of that channel is written in 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 in history memory 7 is retained even when mobile radio 10 is powered off. This standby channel table stores, for example, a maximum of 5 channel numbers. For standby, the number of channel numbers to be stored in the channel table may be smaller if the incoming call control zone is wider than the travel distance of the mobile radio.
If the space is narrow, set a larger amount. For example, when comparing in-vehicle devices and portable devices, in-vehicle devices have a wide movement range and may frequently move between call control zones, while portable devices have a narrow movement range and may move between call control zones. There are few.

Therefore, in the case of an in-vehicle device, the number of memorable channel numbers is set to be large, and in the case of a portable device, it is set to be small.

Thereafter, each time the control section 4 shifts the incoming call control zone and changes the standby incoming control channel, it writes the number of the incoming call control channel in the standby channel table in the history memory 7. If the number of the incoming control channel after the change has already been written in the standby channel table, that number is not written. Furthermore, if a predetermined number of channel numbers have been written, the standby returns to the beginning of the channel table and writes the number of a new incoming control channel.

For example, when the mobile radio 10 is located in the incoming call control zone 21 shown in FIG. 2 at the time of initial power-on, the number of the incoming call control channel 6 is written at the beginning of the standby channel table in the history memory 7. . After this, the mobile radio
When O moves to the incoming call control zone 22,
The incoming control channel P7 is now received and the standby number is written into the second area of the channel table. When the mobile radio 10 moves to the termination control zone 21 again, the number of the termination control channel P6 is already written in the standby channel table, so there is no need to write that number again.

In this way, by creating a channel table in the standby mode based on the numbers of incoming call control channels received in the past, it is possible to memorize channels that are likely to be received.

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 channel table, the control unit 4 uses the standby channel in the history memory 7 instead of the P channel memory 5 to create a P channel table. -Refer to the table. That is, in the standby mode, the received electric field level is measured for the incoming control channel written in the channel table, and the received electric field level is stored in the level order memory 6 in descending order of the level.
write to. 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 some cases, none of the incoming control channels stored in the standby channel table can meet 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 channel number determined at this time is written in place of the oldest data in the standby channel table.

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, by storing the incoming control channels used several times in the past, the mobile radio device of the present invention quickly selects a channel with a high possibility of reception when selecting an incoming control channel. There is an effect that can be done. 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. DESCRIPTION OF SYMBOLS 1... Transmitter/receiver unit, 2... Transceiver/receiver unit, 3... Frequency synthesizer, 4... Control unit, 5... P channel.
Memory, 6... Level order memory, 7... History memory, 10... Mobile radio, 11.12... Base station, 2
1.22... Incoming call control zone.

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 control means for controlling incoming calls according to a received signal of the receiving means, a history storage means for storing which incoming control channel was used in the past; A mobile wireless device comprising: selection control means for controlling the selection means based on the contents stored in the history storage means.