JPH0482431A - Mobile wireless communication system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a mobile radio communication system. More particularly, the present invention relates to a novel signal transmission scheme in a mobile radio communication system using a mobile radio handheld telephone.

Conventional technology With the development of advanced electronics technology and information technology,
Rapid progress has also been made in the use of telephone networks, primarily voice communication services. In particular, the application of so-called wireless technology to telephone networks is remarkable, and in addition to wireless telephones as subscriber terminals, mobile radio communication devices such as pagers, car telephones, and mobile telephones are rapidly becoming widespread.

Under these circumstances, unlike wireless telephones, which aim to simply improve the operability of terminals in wired telephone systems, pagers, car telephones, and mobile telephones have become more advanced in their functions and are not just an extension of the traditional telephone network. We are creating completely new communication value.

By the way, since these mobile wireless communication devices are used wirelessly, they necessarily rely on batteries as a power source. Therefore,
It is required to use limited stored power as effectively as possible.

However, there is always a trade-off between the communication function and power consumption of a mobile wireless communication device, and it is extremely difficult to achieve both functionality and low power consumption. To give a specific example, a pager, which has the simplest function as a mobile wireless communication device, weighs 36g including the battery.
A model that can be used for 8 hours a day and remain on standby for more than two months after being fully charged has already been put into practical use. On the other hand, in the case of a mobile phone, a device weighing 300 g can maintain a standby state for about 8 hours at most, and when used for telephone calls, the continuous use time is significantly shortened.

On the other hand, it goes without saying that a mobile phone, which allows instant conversation in response to a call, is far more desirable as a communication device than a pager, which requires a regular phone call after receiving a call. In fact, it is currently becoming popular at an annual rate of over 50%.There is a strong desire to extend the continuous use time of mobile phones.

However, solving this problem by increasing the capacity of batteries installed in mobile phones induces other problems. That is,
The size and capacity of batteries of the same type are approximately proportional, so if you try to increase the continuous use time by changing the battery capacity, the weight of the device will increase significantly, which will ultimately impair its portability as a mobile wireless communication device. It ends up.

Problems to be Solved by the Invention Therefore, the present invention solves the above-mentioned problems of the prior art, and enables continuous use for a longer period of time without reducing the portability and functionality of a mobile wireless communication device capable of instant conversation. The purpose is to provide a new mobile wireless communication system that enables

According to the invention, a second subscriber calls, via a fixed station, a waiting mobile radio communicator carried by a first subscriber; In a mobile radio communication system for a telephone network capable of wirelessly conversing with the second subscriber via the fixed station, the mobile radio communication device of the first subscriber in a standby state is The signal for calling is the first
and a mobile radio communication system characterized in that the voice signal for a second subscriber's conversation is transmitted at a sufficiently lower frequency than the signal for transmitting the voice signal.

The main feature of the mobile radio communication system according to the present invention is that a paging signal for calling a mobile radio communication device is transmitted at a lower frequency than a signal carrying voice information. That is, the mobile wireless communication system according to the present invention improves continuous use time by significantly reducing power consumption in a standby state when the device is not in use, using a unique configuration as described below.

The pager, which has already been exemplified as a mobile wireless communication device with the lowest power consumption during standby, transmits information at a relatively low frequency in the 150 MHz band.

In contrast, a mobile phone with high power consumption has a power consumption of 800M
Information is transmitted at high frequencies in the Hz band.

Therefore, the pager can be constructed using elements such as CMO3, which have a slow operating speed but extremely low power consumption. On the other hand, mobile phones must use bipolar devices to enable high-speed operation, but such devices generally consume large amounts of power.

Therefore, in the system according to the present invention, the paging signal is conveyed in a low frequency band. Therefore, in the standby state, only the receiver for the calling signal constituted by the CMO3 circuit or the like with low power consumption is activated, and the power to the circuit for voice conversation, which consumes a large amount of power, is completely cut off. Then, when receiving a call signal and starting a voice conversation, power is supplied to the voice conversation circuit for the first time. With the above-described system, a mobile wireless communication device can be realized that has a continuous standby time comparable to that of a pager unless a call is made.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following disclosure is merely an example of the present invention, and does not limit the technical scope of the present invention in any way.

Embodiment FIG. 1 is a diagram schematically showing a specific example of the configuration of a communication network that can realize the mobile wireless communication system according to the present invention.

As shown in the figure, the communication system according to the present invention connects wirelessly with a telephone network formed by a plurality of subscriber terminals 1 and fixed stations 2 connected to these subscriber terminals 1 by wire. This is realized by a mobile wireless communication device 3 capable of conversation.

The mobile radio communication device 3 includes a receiver 31 for paging signals and a transceiver 32 for voice signals. The call signal receiver 31 is always connected to the battery 31a. On the other hand, the audio signal transmitter/receiver 32 is connected to the battery 32a via switches 32b and 32C. The switch 32b is controlled by the calling signal receiver 31 and is normally turned off. On the other hand, switch 32C
is operated by the subscriber carrying the mobile radio communication device 3, but if the switch 32b is cut off, the voice signal transceiver 32 will not operate even if the switch 32C is turned on.

Here, the paging signal is transmitted, for example, by a carrier wave in the 150 MHz band allocated to the pager system,
A voice signal for conversation is transmitted using a carrier wave in the 800 MHz band, for example. Therefore, the calling signal receiver 31 is
The circuit can be configured using elements such as CMO3, which have a low operating speed but consume little power.

The communication system configured as described above operates as follows.

When a paging signal for the mobile radio communication device 3 is transmitted from the subscriber terminal 1 to the fixed station 2, the fixed station 2
A calling signal is transmitted using a carrier wave in the Hz band. The mobile radio communication device 3 receives the paging signal and turns on the switch 32b. At this time, if the switch 32C is turned on, conversation is possible.

Further, in a state where the switch 32c is cut off, the audio signal transmitter/receiver does not enter the operating state even if the switch 32b is turned on, and can be set not to respond to a call.

In addition, as a different aspect, the switch 32C is normally cut off, and conversation is possible when the call signal receiver 31 that has received the call signal turns on the switch 32b, and when the subscriber turns on the switch 32C. It can also be configured to be

If this is 0, the call ends and the subscriber switches to switch 32C.
When the call signal receiver 31 is cut off, only the call signal receiver 31 becomes in a standby state again. In this system, the voice signal transceiver 32 operates only while the subscriber turns on the switch 32C,
In other states, the power supply 32a is not consumed at all even if a calling signal is being received. In addition, when adopting such a system, the configuration is such that when receiving a paging signal, the paging signal receiver 31 generates a ringing tone to notify the subscriber that the paging signal has been received. There is a need to. Further, it is preferable to configure the switch 32b so that when the switch 32C is shut off, the switch 32b is also shut off at the same time.

With the above method, in the mobile radio communication device 3, in the standby state, the paging signal receiver 31 with low power consumption is activated.
All you have to do is keep it running. Therefore, the continuous usable time of the mobile radio communication device 3 including the standby state is extended.

Although the above explanation deals with the case where "subscribers are talking" in a telephone call state, the method according to the present invention can also be applied to other equipment that transmits information in the voice band, such as a wireless mobile facsimile. Needless to say, the present invention can also be applied to devices such as computers and modems.

In addition, in this embodiment, the signal transmitted in the low frequency band is used as the calling signal, but other signals other than the voice band, such as simple signals such as monitoring signals, selection signals, and audible signal sounds, etc. It is also possible to transmit in a frequency band, which also contributes to lower power consumption of the mobile wireless communication device.

As described in detail of the invention, according to the mobile wireless communication system according to the present invention, the power consumed by the mobile wireless communication device in the standby state is significantly reduced, and the mobile wireless communication device can be used by replacing or charging the battery once. time will be extended.

Further, in realizing such functions, the portability of the mobile wireless communication device is not impaired at all.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing a specific example of the configuration of a communication network that can realize the mobile wireless communication system according to the present invention. [Main reference numbers] 1...Subscriber terminal, 2...Fixed station, 3...Mobile radio communication device, 31...Paging signal receiver, 31a, 32a...Battery , 32... Audio signal transmitter/receiver, 32b, 32c... Switch

Claims (1)

[Claims] A second subscriber calls a standby mobile wireless communicator carried by a first subscriber via a fixed station, In a mobile radio communication system for a telephone network capable of communicating wirelessly with said second subscriber, a signal for paging a mobile radio communicator of said first subscriber in a standby state is transmitted to said first subscriber. A mobile radio communication system characterized in that the voice signals for conversation between first and second subscribers are transmitted at a frequency sufficiently lower than that for transmitting the signals.