JP2007259116A - Base station radio apparatus, and digital mobile radio system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of the number of mobile stations becoming short within one base station area in case of emergency, etc.; and further, to prevent disabled communication with a mobile station located in the above base station area, when the base station fails. <P>SOLUTION: In a base station radio apparatus, a controller includes a channel switchover function which is connected to a transmission/reception antenna via a duplexer, and by the channel switchover function, a desired radio channel is selected and set from a plurality of preset radio channels, according to the operation of an operation section, so as to perform radio communication with at least one mobile station using the desired radio channel. The base station radio apparatus is housed in a case, and accommodated in a portable moving means together with a cable housing tool which houses a variety of cables to be connected to the base station radio apparatus concerned. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a digital mobile radio system, and more particularly to an SCPC (Single Channel Par Carrier) type digital mobile radio system and a radio base station.

FIG. 4 shows an example of a conventional SCPC digital mobile radio system.
In this figure, 11 is a plurality of command consoles, 13 is at least one base station, 12 is a switching device for switching the connection between the command console and the base station, 14 is a mobile station (usually a plurality), 16 is a base station 13 Wireless service area.
Here, when a plurality of base stations are installed, different channels (frequency bands) are used in adjacent base stations.
By adopting such a system, the system can be operated covering a wide area.
Further, the base station area 16 of the base station 13 is obtained by area simulation or frequency allocation calculation in consideration of interference with other adjacent base stations, and is distributed.

The channel frequency allocated to one base station is usually a set of base station frequencies 17 of the downlink frequency (F1) from the base station 13 to the mobile station 14 and the reverse frequency (f1).
In addition, when the mobile station 14 is outside the base station area, communication is possible when the mobile stations are located within the radio wave reach using the inter-mobile station direct communication frequency 18 (f0).

Each command console 11 is installed at each office or a desired place, and when communicating with the mobile station 14, it transmits and receives using the base station 13 via the switching device 12.
That is, when the command console 11 is connected to the base station 13 via the switching device 12 on a one-to-one basis, communication (call) with a mobile station within the wireless service area of the connected base station is possible.
In addition, when the command console 11 is connected to a plurality of base stations 13 via the switching device 12 in a one-to-n manner, a group call with a mobile station in the wireless service area of the connected base station is possible.
Further, mobile stations in the same base station area can talk with each other via the base station 13.
Further, mobile stations in different base station areas can communicate with each base station via the switching device 12.

As a conventional SCPC digital mobile radio system, for example, there is one shown in Non-Patent Document 1.

Narrowband digital communication system (SCPC / FDMA) standard ARIB STD-T61

However, in the conventional system described above, for example, the number of mobile stations 14 arranged per one base station 13 is limited by the budget, personnel, etc. of each business office. There is a problem in that the number of mobile stations 14 is insufficient in the case of an emergency in the area 16.
In addition, when the base station 13 itself fails due to a disaster or the like, there is a possibility that a mobile station in the base station area 16 may become unable to communicate. There was a need to resolve.

The present invention was made in view of such conventional circumstances, and solves the problem that the number of mobile stations is insufficient in the case of an emergency in one base station area, It is an object of the present invention to provide a digital mobile radio system capable of preventing a mobile station in the base station area from being unable to communicate when the base station itself fails and a radio base station used therefor.

In order to solve the above-described conventional problems, the invention described in claim 1 includes a power amplification unit, a transmission / reception unit, a duplexer, an operation unit, a power supply unit, an interface unit, and a control unit. In the base station radio apparatus, the control unit includes a channel switching function, is connected to a transmission / reception antenna via the duplexer, and the channel switching function is more desirable than a plurality of radio channels set in advance according to the operation of the operation unit. A base station radio apparatus that performs radio communication with at least one mobile station that uses the desired radio channel by selecting and setting the radio channel, and the base station radio apparatus is housed in a case It is characterized in that it is housed in a portable moving means together with a cable housing that houses various cables connected to the base station radio apparatus.

In order to solve the above-mentioned conventional problems, the invention described in claim 2 is a digital mobile radio system comprising at least one command console, at least one permanent base station, and a plurality of mobile stations. A temporary base station is installed at a position where a radio area overlaps with the radio area of one permanent base station, and the temporary base station sets a second radio channel different from the first radio channel used by the permanent base station The plurality of mobile stations includes at least one mobile station that uses the first radio channel, and at least one mobile station that uses the second radio channel. The base station is stored in a case before operation, and is stored in a portable moving means together with a cable storage unit storing various cables connected to the temporary base station. And wherein the door.

In order to solve the above-mentioned conventional problems, a third aspect of the present invention is the digital mobile radio system according to the second aspect, wherein the temporary base station includes a power amplification unit, a transmission / reception unit, and a duplexer. And an operation unit, a power supply unit, an interface unit, and a control unit, connected to the transmission / reception antenna via the duplexer, the control unit includes a channel switching function, and in advance according to the operation of the operation unit A desired radio channel is selected and set from a plurality of set radio channels.

According to the present invention, the problem that the number of mobile stations is insufficient in the case of an emergency in one base station area is solved, and when the base station itself fails, the base station area It is possible to provide a digital mobile radio system and a radio base station used in the digital mobile radio system that can prevent a mobile station in communication from being disabled.

Embodiments according to the present invention will be described with reference to the drawings.
FIG. 2 shows a first example (support) of the SCPC digital mobile radio system according to the embodiment of the present invention.
In this figure, 11 is a plurality of command consoles, 13 is one base station, 12 is a switching device for switching the connection between the command console and the base station, 20 is a temporary base station, 14 and 15 are a plurality of mobile stations, and 16 is a base station. A radio service area of the station 13 and 19 is a radio service area of the temporary base station 20.
Here, the temporary base station 20 is arranged in the vicinity of the base station 13 or in the radio service area 16 so as to cover an area substantially overlapping with the radio service area of the base station 13.
The temporary base station 20 sets a base station frequency 18 (F2, f2) different from the base station frequency 17 (F1, f1) used by the base station 13, and establishes a radio area called the temporary station area 19. Thus, communication can be performed even if the mobile station 15 using the base station frequency 18 (F2, f2) is present in the base station area 16.

As an operation mode in the case of the system of the first embodiment, for example, it is assumed that a disaster or the like occurs in the base station area 16 of the base station 13 that is normally operated.
When several mobile stations 15 are dispatched as support, the temporary base station 20 is installed in a place (in the base station area 16) different from the normal base station 13, and the set frequency is set to the base station frequency 17 (F1, f1). ) Is set to a different temporary base station frequency 21 (F2, f2), and a temporary base station area 19 is established.
Then, the temporary base station 20 can perform press talk communication with the mobile station 15 and call back of the temporary base station between the supporting mobile stations 15.
Thus, by temporarily setting up the temporary base station 20, it is possible to avoid a situation in which the number of lines increases due to support in the event of an emergency disaster and traffic is congested.

FIG. 1 shows an example of a temporary base station according to the embodiment of the present invention.
The temporary base station 20 basically includes a power amplification unit (PA unit) 2, a transmission / reception unit 3, an operation unit 4, a power supply unit 5, and a control unit 8. The control unit 8 includes a channel switching function, Further, the PA unit 2 is cooled by the cooling FAN 1.
The transmission / reception unit 3 includes a transmission unit and a reception unit, and the transmission unit is amplified by the PA unit 2 and connected to an external transmission / reception antenna via the duplexer 7, and the reception unit via the duplexer. And the transmission / reception antenna are connected.
The external interface (IF) unit 6 includes a connector for connecting to another base station (base station 13 in FIG. 2) and a connector for connecting an AC 100V power source.
Further, in FIG. 1, a speaker and a microphone are built in, but when externally attached, they are connected via an external IF unit 6.
The temporary base station is housed in a geramin case or the like, and can be carried by a cart or automobile, and is configured to be connected to a transmission / reception antenna, an external microphone, or a speaker.
In addition, when another base station 13 and this temporary base station 20 are connected by the external IF 6, a base station code can be assigned to the temporary base station 20 from the command console 11 via the base station 13. Communication between the mobile station or command console in the base station area and the support mobile station 15 can also be made possible.

The operation unit 4 includes a switch, a key panel, a display unit, and the like so as to perform a command operation equivalent or simple to the command console of FIG.
For example, the temporary transmission / emergency transmission of the temporary base station 20 can be switched, and control can be performed by setting one designated frequency from a base station frequency of about 10 ch preset by a dial SW or the like. The channel can be switched for the unit.
The channel switching function stores the above-mentioned specified frequency of about 10 ch in the memory table, and when the channel is switched by the operation unit (dial SW), a desired channel in the memory table is selected according to the switching. Depending on the selected channel, the desired band is set by the synthesizer.
Here, since it is normally used in the normal transmission mode in which radio waves are always transmitted, for example, when changing the frequency ch during operation, the dial SW is changed and the system is automatically set when the set ch is determined. A method of resetting and determining the operating frequency is adopted.

FIG. 3 shows an example of a (normal) base station 13 fixedly installed according to the embodiment of the present invention.
This base station radio apparatus 13 is a control that performs exchanges with a transmission / reception antenna (not shown), a radio system of the shared unit 31, PA unit 33, TRX unit 34, a control unit 35 that controls the own station, and a switching device 12. A terminal comprising a control system of the unit 36, and a FAN unit 32 for cooling the PA unit 33, a power source unit 37 serving as power for the device, and a wired line intake port connected to the switching device 12 A portion 38 is provided.
Further, the overall configuration of the base station radio apparatus 13 shown here is a two-channel mounting type, and there are cases where it is used as a working / standby configuration and cases where two frequencies are allocated and used as a working 2-channel configuration.
Further, when the temporary base station 20 is connected by the terminal unit 38, a base station code can be given to the temporary base station 20 from the command console 11.
The base station 13 has a weight of about 100 kg and a height of about 2100 mm.

The temporary base station in FIG. 1 described above needs to be configured so that it can be easily carried.
In other words, the area where temporary base stations are installed is not always the same place, such as when replacing a base station that is fixedly installed due to a disaster or when a new communication area is required. It is desirable to be able to
Therefore, in the embodiment of the present invention, for example, various units constituting the temporary base station are accommodated in a duralumin case, and the geralumin case is accommodated in a movable object such as a carriage together with necessary cables.
Then, after moving to the required location, the geramin case is opened and a cable or the like is connected to make the temporary base station usable, and the temporary base station (or support base station) in the disaster area is made.
In addition, such a temporary base station has a total weight of various units of about 30 kg and a height of about 480 mm, which is about 1/3 of the weight and about a height of the fixed base station of FIG. It becomes 1/5, and transportation and movement become easy by accommodating this in a portable cart.

6 shows an example of a temporary base station using a portable carriage according to an embodiment of the present invention, FIG. 6 (a) is a side view of the housed state, and FIG. 6 (b) is a perspective view showing the housed state, FIG. 6C is a perspective view showing the state before accommodation.
The carriage has a temporary base station main body stored in a geralumin case, a mounting base for mounting a cable storage unit storing cables, and a guard for preventing falling of the mounted object (see FIG. 6C). .
Then, the geralumin case and the cable housing are placed on the mounting table, a cover for dust prevention and the like is applied, and the geralumin case and the cable housing are fixed by a fixing belt by a hooking portion (through hole in the drawing) of the guard. To accommodate.
By doing in this way, it can be set as the temporary base station by a portable trolley | bogie.

FIG. 5 shows a second example (alternative) of the SCPC digital mobile radio system according to the embodiment of the present invention.
As an operation mode in the case of the system of the second embodiment, for example, when the base station 13 that is normally operated becomes inoperable due to a disaster or failure, the temporary base station 20 is changed to a wireless service of the base station 13. It is arranged in the vicinity of the base station 13 or in the wireless service area 16 so as to cover an area substantially overlapping with the area 16.
Then, the temporary base station 20 sets the same base station frequency 17 as the base station frequency 17 (F1, f1) used by the base station 13, and establishes a radio area called a temporary station area 19 equivalent to the base station area 16. be able to.
In addition, when the temporary base station 20 is connected instead of the base station 13 by the external IF 6, a code that substitutes for the base station 13 can be given to the temporary base station 20 from the command console 11. Communication between the mobile station 14 and the mobile station 14 in the station area can be made possible.

As described above, the number of mobile stations that can be accommodated by one normal base station is limited, and even if the number of mobile stations increases in an emergency such as the occurrence of a disaster, In order to perform reconstruction such as adding and assigning another frequency to the base station, the system configuration of the entire system becomes complicated and expensive.
Further, even if the reconstruction is performed, the wireless line traffic is congested, and communication between the command console 11 to the mobile station 14 and a telephone call may not be sufficiently performed.
Therefore, in the first embodiment described above, the base station frequency 17 (F1, f1) of the base station 13 is set, and in this state, the temporary base station 20 is temporarily placed so as to overlap the base station area 16. A base station 20 is arranged, and a mobile station 15 of support is used.
In addition, it is assumed that the installed normal base station itself cannot be used due to a disaster or the like. In such a case, as in the second embodiment described above, the normal base station 13 can be replaced. The temporary base station 20 can be arranged so as to be.

In other words, in the event of an emergency such as a disaster, a temporary base station with the functions of a normal base station is installed in order to distribute traffic in the event that support is needed. The temporary base station 20 is used to configure the system used or a system using the same frequency as the own station frequency.
Since the temporary base station 20 is not the same as the support or substitute of the normal base station 13, the base station frequency (channel) is switched and set in advance so that the frequency to be used can be easily changed. With this function, when temporary base stations are allocated (temporary), channels can be easily set without the trouble of rewriting frequency data by replacing ROM, etc., and quick response is possible. .

According to an embodiment of the present invention, to provide a temporary base station radio apparatus that is stored in a specific business place or the like during normal times, and is transported to a temporary work place and used temporarily in an emergency disaster or the like. In addition, in such a temporary base station, unlike a normal base station, a use channel (frequency) can be easily changed and set.
In the event of an emergency such as an emergency disaster, an SCPC digital wireless system that uses a temporary base station to prevent congestion should be established when a support mobile station is expected to be brought into the affected area. can do.

For example, in an SCPC digital mobile radio system using the 400 MHz band, it is usually stored at a specific business site, etc., and in the event of an emergency disaster, it is transported to a disaster-stricken business site and temporarily used for support movement. It can communicate with a station, and can be operated as an alternative base station when a normal base station at a disaster-affected workplace becomes unavailable.
When a plurality of support mobile stations are brought into the disaster-affected business site, congestion of mobile radio line traffic can be prevented and traffic distribution can be achieved in the disaster-affected stations.

In addition, this temporary base station is a temporary station or an alternative station of the SCPC digital mobile radio system composed of a transmitter (including a power amplifier), basically a receiver, a power supply, and a duplexer. The device can provide communication services such as voice communication by Press Talk, and is accommodated in a portable case, can be easily transported by people and vehicles, and can be supplied at any location where power can be supplied, Or it is set up as an alternative station.

Here, the configurations of the wireless communication system, the command console, the switching device, the base station device, and the temporary base station device according to the present invention are not necessarily limited to those described above, and various configurations may be used.
The present invention can also be provided as, for example, a method or method for executing the processing according to the present invention, a program for realizing such a method or method, or a recording medium for recording the program. It is also possible to provide various devices and systems. The application field of the present invention is not necessarily limited to the above-described fields, and the present invention can be applied to various fields.
For example, the present invention can be applied not only to communication of voice information but also to communication of various information such as text and images.

The example of the temporary base station block diagram which concerns on embodiment of this invention. The 1st Example (support) of the digital mobile radio system of the SCPC system which concerns on embodiment of this invention. The example of the (normal) base station 13 fixedly installed which concerns on embodiment of this invention. An example of a conventional SCPC digital mobile radio system. The 2nd Example (alternative) of the SCPC system digital mobile radio system which concerns on embodiment of this invention. The example of the temporary base station by the portable trolley | bogie which concerns on embodiment of this invention is shown, (a) Side view of accommodation state, (b) Perspective view showing accommodation state, (c) Perspective view showing before accommodation.

Explanation of symbols

1: FAN part, 2: PA part, 3: Transmission / reception part, 4: Operation part, 5: Power supply part, 6: External line IF part, 7: Duplexer part, 8: Control part,
11: Command console, 12: Switching device, 13: Base station, 14: Mobile station, 15: Mobile station (support), 16: Base station area, 17: Base station frequency (F1, f1), 18: Between mobile stations Direct communication frequency (f0), 19: Temporary station area, 20: Temporary base station, 21: Temporary base station frequency (F2, f2),
31: shared unit, 32: FAN unit, 33: PA unit, 34: transmission / reception unit, 35: control unit 1, 36: control unit 2, 37: power supply unit, 38: terminal unit.

Claims (3)

In a base station radio apparatus configured by a power amplification unit, a transmission / reception unit, a duplexer, an operation unit, a power supply unit, an interface unit, and a control unit,
The control unit includes a channel switching function,
Connected to the transmitting / receiving antenna through the duplexer,
The channel switching function selects and sets a desired radio channel from a plurality of radio channels set in advance in accordance with the operation of the operation unit, thereby wirelessly communicating with at least one mobile station using the desired radio channel. A base station wireless device for communication,
The base station radio device is housed in a case,
A base station radio apparatus characterized in that the base station radio apparatus is housed in a portable moving means together with a cable housing that houses various cables connected to the base station radio apparatus. In a digital mobile radio system composed of at least one command console, at least one permanent base station, and a plurality of mobile stations,
A temporary base station is installed at a position to be a wireless area overlapping with the wireless area of the at least one permanent base station,
The temporary base station sets a second radio channel different from the first radio channel used by the permanent base station,
The plurality of mobile stations includes at least one mobile station using the first radio channel and at least one mobile station using the second radio channel,
Further, the temporary base station is stored in a case before operation, and is stored in a portable moving means together with a cable storage unit storing various cables connected to the temporary base station. Mobile radio system. The temporary base station is composed of a power amplification unit, a transmission / reception unit, a duplexer, an operation unit, a power supply unit, an interface unit, and a control unit,
Connected to the transmitting / receiving antenna through the duplexer,
The digital mobile radio according to claim 2, wherein the control unit includes a channel switching function, and selects and sets a desired radio channel from a plurality of radio channels set in advance according to an operation of the operation unit. system.

Images