JPH089447A - Wireless communication device for premises and wireless communication method for premises - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a private wireless communication system in which carrier sense of the system is unnecessary and co-channel interference does not occur. Further, there is provided a wireless base station device capable of identifying the usage status of the wireless base station and its change and easily installing and rearranging the wireless base station. [Configuration] A central control station capable of communicating with all radio base stations is provided to manage frequencies for communication between the base stations and mobile stations.
Furthermore, a wireless base station integration device having a function of determining the state of the wireless base station is provided. [Effect] Since carrier sense and the like are not required, control can be greatly simplified, and call interruptions and the like can be reduced. Furthermore, low-cost wireless base station installation can be realized, and wireless base station relocation can be performed quickly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a premises radio communication device and a premises radio communication method.

[0002]

2. Description of the Related Art There have been two conventional wireless communication systems for premises. In order to describe these two wireless communication systems, description will be given with reference to FIG. The figure shows a system composed of a plurality of radio base stations 1a to 1d and a plurality of mobile stations 2a to 2d, and zones 4a to 4d are callable areas of the radio base stations 1a to 1d.

The first method is for each of the radio base stations 1a ...
This is a method in which frequencies that do not cause co-channel interference are fixedly assigned to 1d, and each base station communicates using only the assigned frequencies. The second method is to enable all the frequency channels to be commonly used by all the radio base stations 1a to 1d, and search for an empty frequency channel that is not used by the surrounding radio base stations every time a call occurs ( Carrier sense) is performed, and communication is performed using the vacant frequency channel.

First, a first method, that is, a method of fixedly assigning frequencies to the radio base stations 1a to 1d will be described below. For example, the total usable frequency of the system is f
When there are 100 waves up to 1, f2, f3 ..., f100, the usable frequency of the wireless base station 1a is from f1 to f25,
The frequencies available to the radio base station 1b are f26 to f50, the radio base station 1c is f51 to f75, and the radio base station 1d is f76 to f100. By doing so, each radio base station communicates using only its frequency.
When the same frequency is used repeatedly, it is assigned to radio base stations that are sufficiently far apart so that co-channel interference does not occur.

As described above, in the "fixed frequency allocation system", once the base station is set up, each of the radio base stations is vacant among the frequencies allocated to the base station. Since frequency is used, co-channel interference does not occur. Further, there is an advantage that control can be simplified because there is no need for carrier sense when a call is requested.

However, this method has a drawback in that it is necessary to perform a complicated frequency allocation work in consideration of a radio wave propagation path condition when installing a radio base station. Further, there is a drawback that a complicated frequency reallocation work is required every time the radio base station needs to be rearranged due to a pattern change or the like. In addition, when operating the system in a complex indoor environment, when a wireless base station is temporarily installed, unforeseen calls or co-channel interference may occur due to complicated radio wave propagation characteristics. There is a drawback that it is necessary to repeatedly perform the relocation of the radio base stations and the reassignment of the complex frequency for improvement.

As described above, the "system in which frequencies are fixedly allocated" has a serious problem that communication cannot be performed due to changes in radio wave propagation paths and traffic, and co-channel interference cannot be quickly dealt with.

Next, a second method, that is, a method in which all frequency channels can be commonly used in all radio base stations, an empty frequency channel is searched every time a call occurs, and communication is performed using the empty channel Will be described.

This "method in which all frequencies can be commonly used in all radio base stations" is that all the radio base stations can use all frequencies f1 to f100. Channel allocation at this time is performed as follows.

The radio base station to which the mobile station makes a call request performs carrier sense on all frequencies, and when it finds a usable frequency, it notifies the mobile station. The mobile station performs carrier sense of the notified frequency. If the interference level at this time is below a certain level, it is determined that the frequency can be used, and the call is started.

[0011] In such a "system in which all frequencies can be commonly used in all radio base stations", there is a problem in "system in which frequencies are fixedly allocated", which is a complicated work for installing radio base stations. Since there is no disadvantage that the work is required, there is no need for frequency allocation work when the radio base station is arranged, and thus the work can be greatly simplified. Therefore, there is an advantage that the rearrangement can be flexibly and easily performed according to the use environment and traffic. However, this method has a drawback in that carrier sensing is required every time wireless communication is performed, and control becomes extremely complicated.

This is because each of the radio base stations does not have information on the frequency usage status in the entire service area, and therefore it is necessary to perform carrier sense.

Further, when the mobile station largely moves during a call, it may approach another radio base station or mobile station using the same frequency, and co-channel interference may occur at this time. At that time, there is a problem that, for example, a procedure for carrier sense and reconnection is required again, and complicated control for that is required. In this case, the worst vacant frequency may not be found and the connection may be cut off.

As described above, the "system in which all frequencies can be used in common by all radio base stations" can greatly simplify the work when arranging the radio base stations, but the control becomes complicated. There is a big drawback. The conventional system described above and its problems are summarized below. As the conventional system, (1) a method of fixedly allocating a channel to each base station when designing a station, (2) a channel of each base station There was a method of allocating a vacant frequency by performing an empty channel search every time a call request is made without allocating, but with regard to (1), since the line design is performed in anticipation of deterioration due to interference and thermal noise, Once stationed, there is an advantage that you do not have to worry about deterioration of call quality, but on the other hand, there are disadvantages that it is difficult to deal with uneven traffic, and once stationed, you cannot change it. It can be said that this method is not suitable for a wireless communication system on the premises.

With respect to (2), there is no need to design station placement and it is possible to flexibly deal with non-uniformity of traffic, but on the other hand, carrier sense is performed every time a call is requested. However, there are disadvantages such as necessity and complexity of control, delay in connection, and high possibility of blocking communication due to co-channel interference.

At present, a large number of methods (2) are adopted in the wireless communication system on the premises. The reason is that it has the above-mentioned disadvantages, but the merit of avoiding the complexity of the station placement design and the high flexibility of the station placement outweigh the disadvantages. Another reason why the method of (1) is not adopted is that it is very difficult to estimate the indoor radio wave propagation, and even if it is possible, it is easy to change the layout and layout of the furniture in the living room. The point is that the line design itself is extremely difficult or impossible because the propagation characteristics change.

Further, regarding the installation of the radio base station of the indoor radio communication system, there is a conventional device shown in FIG. Conventionally, as shown in the figure, a plurality of wireless base stations 1 are directly attached to a wall surface, a ceiling or the like, and are connected to a telephone line.

By the way, since traffic in offices and the like is non-uniform, the traffic density may become extremely high locally. For this reason, there has been a problem that the call loss at a specific place may be extremely large after the system is used.

In order to solve this problem, if a large number of wireless base stations are installed in advance in a place where traffic is expected to increase, an excessive number of wireless base stations may occur, resulting in unnecessary cost. Occurs. Also, even if the required number of wireless base stations are added later, installation and wiring work will be required again, which not only reduces costs, but also leaves a lot of interruptions until the installation is completed. Then, there was a big problem that the wireless communication system had to be operated.

This means that it is difficult to quickly respond to a business reason or a temporary increase in traffic at a certain place due to a long-term event or the like.

On the other hand, when installing a radio base station,
If it is installed directly on the surface of a wall or ceiling as shown in 10,11, the wireless device is exposed and the aesthetics of the office are greatly impaired. To solve this problem, it takes time and effort to install the device inside the ceiling or the wall, and there is a problem in that the installation cost is high and the reinstallation becomes difficult. In particular, the work of providing an opening on the ceiling or the wall surface after completion of the building and the work of repairing it are very costly, and the finish after the completion of the work is often poor, which is aesthetically undesirable.

[0022]

As described above, in the conventional system, when the wireless communication system is introduced into the premises, it is difficult to estimate the indoor radio wave propagation characteristics, and thus the fixed channel allocation method is adopted. In addition, the method that does not assign a fixed channel to each base station requires carrier sensing for each call request, which complicates control, causes delay, and causes a call due to co-channel interference. There were problems such as high possibility of being blocked.

Further, when the radio base stations are installed, they are individually installed in a place where there is no dedicated installation equipment, which is very time-consuming, and traffic bias and changes due to differences in business and others, and changes in call areas. It is difficult to flexibly respond to such situations, and there is a problem that the aesthetics are spoiled.

Therefore, the present invention eliminates these problems,
A simple add-on device provides a system that is easy to control by eliminating the need for carrier sense, has a short average connection time, and does not cause co-channel interference, and easily provides a wireless base station due to traffic bias or a change in call area. It is an object of the present invention to provide an on-premise wireless communication system including a wireless base station installation device capable of identifying and determining the usage status of a wireless base station and enabling the installation.

[0025]

In the indoor radio communication apparatus according to the present invention, a plurality of radio mobile stations, a plurality of radio base stations, and a time division multiplexing system between the radio mobile stations and the radio base stations are provided. Alternatively, in a premises radio communication device including a channel management unit that allocates channels before starting signal transmission by a frequency division multiplexing method, the channel management unit is provided between the first wireless mobile station and the first wireless base station. When allocating channels, it is characterized in that a channel different from the channel already allocated between the second wireless mobile station and the second wireless base station is allocated.

Further, in the indoor radio communication device of the present invention, a plurality of radio mobile stations, a plurality of radio base stations, and a time division multiplexing system or a frequency division multiplexing system between the radio mobile stations and the radio base stations are used. In a wireless communication device for premises comprising a channel management unit that allocates channels before starting signal transmission, when the channel management unit allocates channels between the first wireless mobile station and the first wireless base station. Is characterized by preferentially allocating a channel different from the channel already allocated between the second wireless mobile station and the second wireless base station.

Further, in the indoor radio communication device of the present invention, the channel management unit does not include a channel different from the channel already assigned between the second radio mobile station and the second radio base station. In addition, a channel having a relationship of inter-channel interference smaller than a predetermined inter-channel interference amount is allocated between the first radio mobile station and the first radio base station.

Further, in the indoor radio communication device of the present invention, the channel management unit determines a predetermined channel when the total amount of allocated time of the channels allocated within a certain past period exceeds a predetermined time. A channel having a relationship of inter-channel interference smaller than the inter-interference amount is allocated between the first radio mobile station and the first radio base station.

Further, in the indoor radio communication apparatus of the present invention, the plurality of radio base stations are fixedly installed, and each of the radio base stations has a predetermined period according to its own channel allocation situation. The feature is that the installation location is changed after.

In the indoor radio communication method of the present invention, a plurality of radio mobile stations, a plurality of radio base stations, and a time division multiplexing system or a frequency division multiplexing system between the radio mobile stations and the radio base stations are used. In a premises wireless communication method comprising a channel management unit that allocates channels before starting signal transmission, when the channel management unit allocates channels between the first wireless mobile station and the first wireless base station. Is assigned a channel different from the channel already assigned between the second wireless mobile station and the second wireless base station.

Further, in the indoor radio communication method of the present invention, a plurality of radio mobile stations, a plurality of radio base stations, and a time division multiplexing system or a frequency division multiplexing system between the radio mobile stations and the radio base stations are used. In a premises wireless communication method comprising a channel management unit that allocates channels before starting signal transmission, when the channel management unit allocates channels between the first wireless mobile station and the first wireless base station. Is characterized by preferentially allocating a channel different from the channel already allocated between the second wireless mobile station and the second wireless base station.

Further, in the indoor radio communication method of the present invention, the channel management unit does not include a channel different from a channel already assigned between the second radio mobile station and the second radio base station. In addition, a channel having a relationship of inter-channel interference smaller than a predetermined inter-channel interference amount is allocated between the first radio mobile station and the first radio base station.

Further, in the indoor radio communication method of the present invention, the channel management unit determines a predetermined channel when the total amount of allocated time of the channels allocated within a certain past period exceeds a predetermined time. A channel having a relationship of inter-channel interference smaller than the inter-interference amount is allocated between the first radio mobile station and the first radio base station.

Further, in the indoor radio communication method of the present invention, the plurality of radio base stations are fixedly installed, and each of the radio base stations has a predetermined period depending on its own channel allocation situation. The feature is that the installation location is changed after.

[0035]

The present invention has a central management station for centrally managing information on frequencies in use in a private wireless communication system, and the central management station is wired or wireless with a plurality of wireless base stations constituting the system. It is connected by a line and notifies the central management station of the channel information that each of the radio base stations is using.

The radio base station accesses the central management station and obtains frequency information used without searching for a usable frequency, thereby using a frequency that is not used by any of the radio base stations. , The wireless line can be connected immediately.

Furthermore, when the radio base station is installed, the wall of the building,
By installing a radio base station control unit with a telephone line connected to a part of the ceiling, etc., a mechanism unit that can connect and fix the radio base station to the telephone line with a simple operation and also can be easily removed is provided. Further, the wireless base station installation device is provided with an operation status display mechanism capable of easily identifying and determining the operation status of the wireless base station by using a light emitting element or a display element.

According to the present invention, as shown in FIG. 1, the frequency usage status of the entire indoor radio communication system is monitored by the central control station 3.
In this case, by centrally managing, the frequency in use is not used by other base stations, and by providing the available frequency information to each radio base station, there is no co-channel interference, so avoiding interference during a call. It can be unnecessary. Further, it is not necessary to search for an available frequency when a call occurs.

Further, by using the dedicated radio base station control unit, the radio base station 1 of the radio communication system can be easily installed and removed, and the operation status of the radio base station 1 can be changed by a light emitting element or a light emitting element. Since it is possible to easily identify and judge by using a display element, etc., it is possible to respond quickly and flexibly at low cost to problems and changes in traffic etc. in operating the wireless communication system. be able to.

[0040]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing an embodiment of the present invention, which is 1a.
~ 1e is a radio base station, 2a ~ 2e is a mobile station, 3 is a central management station,
Reference numerals 4a to 4e indicate callable areas of the radio base stations 1a to 1e. Further, each radio base station is configured to communicate with the central management station regarding frequency allocation information.

Here, the total number of communication channels of the system is s,
When the average traffic density (erl / m2) is D and the service area area is A (m2), {(AD) s / s!} / Σ {(AD) j / j!} <0.03 is satisfied. Be present. The above formula is generally Erlang B
It is called a formula and shows the condition that the call loss rate is 3% or less, but in the case of a building of a normal size, the above condition is satisfied in most cases. For example, the average traffic density is 9200erl / km2 and the service area is 100m ×
The number of channels required is 200 or less when assuming a 30m 5-story building and 15000m2, and the above conditions are satisfied when PHS is used. Therefore, it is understood that it is not necessary to use the same frequency repeatedly.

The present invention is based on the above-mentioned condition, that is, it is not necessary to repeatedly use the same frequency. It makes it possible to provide a system that is easy to design.

The operation of this embodiment will be described below. When a call request is made to the radio base station 1, the radio base station
1 accesses the central control station 3 and requests frequency (or slot) usage information. Based on the frequency use information, the radio base station 1 selects a frequency that is not used for other communication, and starts communication with the mobile station 2. The radio base station 1 sends information on the frequency used at this time to the central control station 3, and the central control station 3 updates the frequency use information. When the communication with the mobile station 2 is completed, the radio base station 1 sends information for releasing the used frequency to the central control station 3, and the central control station 3 updates the frequency information again.

With such a structure, the effect is that there is no need for carrier sense, and the average connection time can be shortened. Since communication is not performed using the frequency used for other communication, even if the mobile station 2 moves, co-channel interference does not occur, and stable communication can be guaranteed. In addition, since it is possible to communicate at the same frequency as it is without the need to search for an empty slot at the time of handover, control can be simplified.

Therefore, by utilizing this action, the radio base station can be installed without complicated work such as frequency allocation, and it can be easily re-installed according to the traffic, and co-channel interference can be eliminated. It is possible to realize a system that can further reduce the connection time.

FIG. 2 shows an embodiment of the present invention. 1a to 1e are radio base stations, 2a to 2e are mobile stations, 3 is a central control station, and 4a to 4e.
Indicates a callable area of the wireless base stations 1a to 1e, the wireless base station 1 and the mobile station 2 perform wireless communication, and each wireless base station is used for communication / communication with the central management station. It is connected by a wireless device that communicates with a dedicated frequency different from the wireless device.

In order to operate this, when a call request is made to the radio base station 1, the radio base station 1 is operated by the central management station.
Access 3 to request frequency (slot) usage information. Based on the frequency usage information, the radio base station 1 selects a frequency that is not used for communication by others, and starts communication with the mobile station 2. The radio base station 1 sends the frequency information used at this time to the central control station 3, and the central control station 3 updates the frequency use information. The wireless base station 1 is a mobile station
2 Even when the communication with the
Then, the central control station 3 updates the frequency information again.

Next, a concrete method of exchanging control information for the above-mentioned two embodiments will be described. FIG. 8 shows an example of the configuration of the central control station 3 of the present invention. 3 is a central control station, 13 is a frequency information communication device, 14 is an arithmetic processing device, and 15 is a storage device. In the figure, the central control station 3 is the frequency information communication device 13 capable of communicating with all the radio base stations 1,
The storage device 15 for storing a table showing the relationship between the frequency currently in use in a wireless system and the wireless base station 1.
It comprises an arithmetic processing unit 14 for rewriting the contents of the storage unit 15. Next, the operation of the central control station 3 shown in FIG. 8 will be described in detail.

A request for frequency information is issued from the radio base station 1 (not shown in FIG. 8) to the central control station 3 to the frequency information communication device 13. Upon receiving this, the frequency information communication device 13 immediately returns to the wireless base station 1 a notification indicating that the request for frequency information has been received, and at the same time, sends it to the processing device 14 together with the ID of the wireless base station 1. Transfer the frequency information request. Upon receiving the frequency information request, the arithmetic processing unit 14 refers to the table of the storage unit 15, selects one of the frequencies that is currently unused, and notifies the frequency information communication unit 13 of the frequency. further,
The table of the storage device 15 is rewritten for the frequency and the ID of the wireless base station 1. Further, the frequency information communication device 13 having received the frequency selected by the arithmetic processing device 14 transfers the information to the radio base station 1. Through the above operation, the radio base station 1 starts communication with the mobile station 2 at the frequency designated by the central management station 3. When communication is completed, the wireless base station 1
Transmits to that effect to the central management station 3, the frequency information communication device 13 that has received the communication end information transfers to the arithmetic processing device 14, and the arithmetic processing device 14 causes the wireless base station 1
The table in the storage device 15 is rewritten based on the ID and the communication end information.

Next, the frequency information table of the storage device 15 will be described. FIG. 9 shows a conceptual diagram of the frequency information table stored in the storage device 15. As shown in the figure, the frequency information table holds a correspondence table of frequencies in use and IDs of the radio base stations 1 using the frequencies, and information on unused frequencies. The arithmetic processing unit 14 that has accessed the storage unit 15 selects one frequency from the currently unused frequencies by referring to this table and moves the frequency to the table in use, and Enter a new station ID in the table. In the case of communication end information, after confirming the radio base station ID, the frequency is moved to an unused table.

The method of selecting one of the currently unused frequencies is a method of randomly selecting, a method of selecting in the order of increasing frequency (or an order of decreasing frequency), or a method of increasing frequency in the past (or Various methods are used, such as a method of selecting in ascending order) or a method of preferentially selecting a frequency (a frequency is selected so that the used frequencies are not continuous) in a place where three or more unused frequencies are continuous. it can.

Next, a description will be given of an embodiment relating to a method of coping with a case where the traffic increases (temporarily) such that the expression given above as the Erlang B expression is not satisfied (temporarily). The configuration of the central control station 3 used at this time will be described based on the configuration shown in FIG. In the figure, 13 is a frequency information communication device, 14 is an arithmetic processing device, and 15 is a storage device. Since these have the same functions as those shown in FIG. 8, description thereof will be omitted here. Further, in this embodiment, the central control station 3 shown in FIG.
On the other hand, a traffic monitoring device is further incorporated. The traffic monitoring device monitors the number of channels currently allocated, and the threshold value with the number of allocated channels (a system designer can arbitrarily select an appropriate value from about 90% to 100%). When it crosses, flag F is set. After that, when a channel allocation request is issued from the base station, the arithmetic processing unit 14 recognizing that the flag F is set indicates from the allocation information in the storage unit 15 that the requesting base station A exists. The channel allocated to the base station B on the floor farthest from the floor is the base station A
Tell them to use it. As a result, when the same channel is used in the same building, the channel that is least likely to cause interference is automatically used.

FIG. 3 shows an embodiment of the radio base station control apparatus of the present invention, in which 5 is equipment for incorporating a wall such as a locker, and 6a to 6g.
Is a wireless base station unit installation unit, 7 is an electrical connection device such as a telephone line, 8 is a switch such as a PBX, and 9 is a light emitter or the like that indicates the operating status of the installed wireless base station.

A connection terminal for connecting to a telephone line is provided in the wireless base station unit installation section, and has a structure in which the wireless base station is fixed and physically connected to the telephone line. In order to operate this, it can be physically fixed by inserting the required number of radio base stations according to the traffic into the installation part built into the wall at the place where it should be installed, and through the connection terminals inside the installation part. It is electrically connected to a telephone line. Where the radio base station is not inserted, the opening is closed by the panel, but the mechanism in which the panel is stored in the opening when the radio base station is inserted is more convenient than the mechanism that removes it when inserting the radio base station. high. Also,
It is advantageous that the antenna and the like are exposed on the surface in terms of their function.

The radio base station control unit recognizes the operating statuses of all radio base stations connected to the radio base station unit installation section, and determines whether the number of radio lines (radio base stations) during traffic busy is excessive or insufficient. Alternatively, it has a function of displaying an operation status display such as a usage time or usage efficiency of the wireless base station by a light emitting element or the like.

For example, when the usage time ratio is 10% or less, a green LED display is displayed, and when the usage time ratio is 90% or more, a red LED display is displayed. As a result, it is possible to visually judge the usage status of the wireless base station connected to the wireless base station control device and the excess or deficiency of the wireless base station. Although this display is displayed as a result of a fixed integration time, the integration time can be arbitrarily set by the system administrator, for example, for the past 1 hour or the previous 24 hours.

Since the radio base station control unit of the local radio communication system of this embodiment has the above-mentioned structure, its effect is that the traffic condition of the location can be visually confirmed by visually recognizing the usage status of the radio base station. It is easy to determine the excess or deficiency of the line capacity, and the radio base station is not installed wastefully. And because it is easy to connect and disconnect,
It is possible to relocate the radio base station in a very quick manner without any trouble. Further, since it is installed on the wall surface, there is a great merit that anyone can easily perform the work. This means that even if the propagation characteristics cannot be accurately estimated, by repeatedly attaching and detaching the wireless base station,
This means that quick response is possible. Moreover, it is possible to efficiently arrange the radio base station units, which are limited in number, and to effectively utilize them.

FIG. 4 shows an embodiment of a radio base station control system of the present invention, in which 5 is a device embedded in the ceiling of an air conditioner, 6a to 6d are radio base station unit installation parts, and 7 is a telephone line. Isoelectric connection device, 8 is a switch such as PBX, and 9 is a light emitter or the like that indicates the operating condition of the installed wireless base station.

In this embodiment, when the wireless base station control unit is installed on the ceiling, an insertion port for the wireless base station is installed around the air conditioner. When the installation part is provided around the air outlet of the air conditioner in this way, the radio base stations are arranged with a certain distance (specifically, half a wavelength or more), so that the correlation of the received power is The amount is reduced and a so-called diversity effect is obtained. Further, since the air conditioner always needs an electric wire for supplying power, etc., there is an advantage that the electric wire wiring of the wireless base station can be omitted. Furthermore, because it is installed on the ceiling, it is convenient to see the light emitting display and so on. Further, since the temperature and humidity are controlled by the air conditioner, it is possible to provide an environment in which the operation of the wireless base station is stable.

Since the structure is as described above, the effect is that the temperature change of the radio base station is small, so that the specifications at the time of circuit design can be significantly relaxed, and the development / design period can be shortened and drastically reduced. It also leads to cost reduction. Further, since the centralized device is located on the ceiling, the operation status is very easy to understand, it is easy to determine whether the wireless base station is excessive or insufficient, and the wireless base station can be effectively used without wasting it.

FIG. 5 shows an embodiment of a radio base station control apparatus of the present invention, in which 5 is a lighting device, 6a to 6f are radio base station unit installation parts, 7 is an electrical connection device such as a telephone line, and 8 is PBX
And the like, and 9 is a light emitter or the like that indicates the operating status of the installed wireless base station.

In this embodiment, a radio base station unit insertion port of the base station control unit is provided around the fluorescent lamp.
At this time, the wireless base station is installed in the immediate vicinity of the fluorescent lamp.

By the way, when the fluorescent lamp is turned on, when the power supply frequency is 50 Hz, the fluorescent lamp repeats conduction and non-conduction 100 times per second. This is equivalent to repeating the state where there is a metal rod (when conducting) and the state where there is nothing (when not conducting) in the vicinity of the radio base station at high frequencies where the radio base station makes a call,
It works by repeating whether or not it reflects radio waves.

As a result of such an action, fading of 100 Hz is artificially generated due to the presence of the fluorescent lamp. By utilizing the fact that the electric field strength of the transmitted and received waves fluctuates due to the fading of 100 Hz, it is possible to increase the probability that communication can be performed in a location where communication is poor.

For example, in indoor propagation, shadowing or the like depending on the building structure occurs due to the interference of multiple incoming waves due to multipath. Therefore, there occurs a place where the electric field strength becomes extremely weak, and if the mobile station does not move in this place, there is no fading and communication cannot be performed. However, due to the artificial fading of 100 Hz as described above, the electric field strength is not constant at a low value and may increase instantaneously. Therefore, it is possible to avoid a state where communication becomes impossible by sufficiently slowing the transmission speed at this place. Also, when considering packet transmission, it is possible that packets can be transmitted in the portion where the instantaneous value fluctuation of the received wave is high by making this packet length sufficiently small, and the shadowing of shadowing will stop. It is possible to further reduce the probability that communication is not possible even when the user is present. At this time, it is possible to significantly increase the probability of communication by adjusting the timing considering that the fading cycle is 100 Hz and synchronizing it.

FIGS. 3 to 5 are views showing an embodiment of a radio base station installation device used for the indoor radio communication device of the present invention. In this, as shown in FIG. It is a wireless base station control device.

Next, FIG. 6 shows still another embodiment of the radio base station control apparatus of the present invention. In FIG. 6, 11 is an external output terminal for RF output, and 12 is an input terminal for an external signal to the signal processing unit. In the radio base station control device, the radio unit output of the radio base station 1a can be input to the signal processing unit of the other radio base station 1b by a simple operation.

This radio base station control unit has a function of identifying and displaying the operation status of the installed radio base station 1. From this, it can be seen that there is the wireless base station 1a that is not used at that time because the traffic is light. In this case, if there is a shortage of radio lines for the other radio base station control unit and a radio base station is required, it may be installed there. However, if there is no problem in the system usage, the wireless base station 1a is unnecessary.

As described above, when a sufficient number of wireless base stations are installed, and when there are unused wireless base stations, unnecessary antenna units and wireless units of the wireless base stations are installed. It becomes possible to connect to the base station in use and make effective use of it.

That is, R of unnecessary radio base station 1a
By connecting the output F to the input terminal to the signal processing unit of the wireless base station 1b in use, two systems of signals are input to the wireless base station 1b. By comparing these input signals and selecting a signal with a high received electric field strength for use in communication, communication with better transmission quality can be expected (spatial diversity effect). In order to eliminate the influence of shadowing and the like as much as possible, when it is desired to separate the positions of the two wireless base stations 1, for example, the wireless base station 1a and the wireless base station shown in FIG.
It can be realized by connecting 1d.

It is very useless to leave unnecessary radio base stations installed and not to use them, but in the present embodiment, it is preferable to effectively use the base stations that are rarely used as described above. Transmission quality can be provided.

FIG. 7 shows an embodiment of the present invention, which shows the radio base station control unit having a radio unit (frequency control radio unit) capable of communicating with the central control station 3 shown in FIG. ing. The wireless base station 1 is connected to a telephone line via a wireless base station control device. Furthermore, the wireless base station
1 has a structure that is connected to a radio device for frequency management.

When a call request is made to the radio base station,
A request for use frequency information is output to the frequency management wireless device, and the frequency management wireless communication device communicates with the central management station. The used frequency information is notified from the frequency management wireless device to the wireless base station. The frequency information of the radio base station is similarly notified to the central management station.

With such a structure, the effect is that it is not necessary for each radio base station to individually have a radio device for frequency management, and one radio communication device for frequency management can be shared. The overall size and cost of the system can be reduced.

Further, since it is not necessary to have a plurality of frequency management wireless communication devices in one wireless base station control unit, a circuit caused by unnecessary radiation between frequency management wireless communication devices including communication failures such as interference and interference. There is an advantage that the possibility of causing a failure can be suppressed.

[0076]

As described above, in the indoor radio communication system of the present invention, the central control station centrally manages the entire channel use status, and the channel being used by one radio base station is managed by another radio base station. By controlling so as not to use, it is possible to eliminate co-channel interference without carrier sense, so that there is no need to avoid interference during a call, and the control can be greatly simplified. Further, there is an effect that the average connection time when a call is generated can be shortened. Further, there is an effect of greatly reducing the probability of interruption during handover.

Further, since it is possible to provide a radio base station control unit having a function of easily determining the radio base station usage condition when installing the radio base station, and having a structure that makes it extremely easy to install and remove the radio base station. In addition, it is possible to quickly and inexpensively deal with areas where calls cannot be made or areas where there are many interruptions, and it is possible to quickly deal with traffic deviations and changes.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a wireless communication system of the present invention.

FIG. 2 is a configuration diagram of a wireless communication system of the present invention.

FIG. 3 is a diagram showing a structure of a wireless base station installation device of the present invention.

FIG. 4 is a diagram showing a structure of a wireless base station installation device of the present invention.

FIG. 5 is a diagram showing a structure of a wireless base station installation device of the present invention.

FIG. 6 is a diagram illustrating a wireless base station installation device of the present invention.

FIG. 7 is a diagram showing a structure of a wireless base station installation device of the present invention.

FIG. 8 is a diagram showing a structure of a central management station.

FIG. 9 is a diagram illustrating a storage device of a central management station.

FIG. 10 is a configuration diagram of a conventional wireless communication system.

FIG. 11 is a diagram illustrating installation of a conventional wireless base station.

[Explanation of symbols]

 1a to 1e Radio base station 2a to 2e Mobile station 3 Central control unit (Central Control Unit) 4a to 4e Zone (service area) of each radio base station 5 Wall or ceiling built-in equipment 6 Radio base station installation section 7 Telephone line etc. Electrical connection equipment 8 Switching equipment such as PBX 9 Radio base station operation status display equipment 10 Radio equipment for frequency management 11 External output terminal for radio section output 12 External signal input terminal for signal processing section 13 Frequency information communication equipment 14 Arithmetic processing Device 15 Storage device

Claims (10)

[Claims] 1. A plurality of wireless mobile stations, a plurality of wireless base stations, and channel allocation before starting signal transmission between the wireless mobile stations and the wireless base stations by time division multiplexing or frequency division multiplexing. In the on-premise wireless communication device comprising a channel management unit for performing the above, when the channel management unit allocates a channel between the first wireless mobile station and the first wireless base station, A wireless communication device for premises, wherein a channel different from a channel already allocated between the second wireless base stations is allocated. 2. A plurality of wireless mobile stations, a plurality of wireless base stations, and channel allocation before starting signal transmission between the wireless mobile stations and the wireless base stations by time division multiplexing or frequency division multiplexing. In the on-premise wireless communication device comprising a channel management unit for performing the above, when the channel management unit allocates a channel between the first wireless mobile station and the first wireless base station, A wireless communication device for premises, wherein a channel different from a channel already allocated between second wireless base stations is preferentially allocated. 3. The channel management unit determines a predetermined inter-channel interference amount when there is no channel different from a channel already assigned between the second radio mobile station and the second radio base station. 3. The indoor radio communication apparatus according to claim 2, wherein a channel having a smaller inter-channel interference is allocated between the first radio mobile station and the first radio base station. 4. The channel management unit detects inter-channel interference smaller than a predetermined inter-channel interference amount when the total amount of allocated time of channels allocated within a certain past period exceeds a predetermined time. 3. The indoor radio communication apparatus according to claim 2, wherein a channel having the following relationship is assigned between the first radio mobile station and the first radio base station. 5. The plurality of wireless base stations are fixedly installed, and each wireless base station is changed in installation location after a predetermined period of time according to its own channel allocation situation. Claim 1, 2, 3 or 4 characterized
The wireless communication device for premises described. 6. A plurality of wireless mobile stations, a plurality of wireless base stations, and channel allocation before starting signal transmission between the wireless mobile stations and the wireless base stations by time division multiplexing or frequency division multiplexing. In the on-premise wireless communication method comprising a channel management unit for performing the following, when the channel management unit allocates a channel between the first wireless mobile station and the first wireless base station, A wireless communication method for private use, comprising allocating a channel different from the channel already allocated between the second wireless base stations. 7. A plurality of wireless mobile stations, a plurality of wireless base stations, and channel allocation before starting signal transmission between the wireless mobile stations and the wireless base stations by time division multiplexing or frequency division multiplexing. In the on-premise wireless communication method comprising a channel management unit for performing the following, when the channel management unit allocates a channel between the first wireless mobile station and the first wireless base station, A wireless communication method for a premises, characterized by preferentially allocating a channel different from a channel already allocated between the second wireless base stations. 8. The channel management unit determines a predetermined inter-channel interference amount when there is no channel different from a channel already assigned between the second radio mobile station and the second radio base station. 8. The indoor radio communication method according to claim 7, further comprising allocating a channel having a smaller inter-channel interference relationship between the first radio mobile station and the first radio base station. 9. The channel management unit detects inter-channel interference smaller than a predetermined inter-channel interference amount when the total amount of allocated time of channels allocated in a past fixed period exceeds a predetermined time. 8. The indoor radio communication method according to claim 7, wherein a channel having the following relationship is allocated between the first radio mobile station and the first radio base station. 10. The plurality of wireless base stations are fixedly installed, and the respective wireless base stations are installed in different locations after a predetermined period of time according to their own channel allocation status. 10. A wireless communication method for indoor use according to claim 6, 7, 8 or 9.