JPH0468925A - Method for dynamic assignment of carrier frequency for communication - Google Patents

Abstract

PURPOSE:To prevent interference with other base station by selecting a communication carrier frequency of present base station again when the coincidence with the communication carrier frequency of other base station is detected. CONSTITUTION:Each base station equipment 300 monitors a communication carrier frequency used for other base station equipment 300 based on the content of received BCCH (Broadcast Control Channel) and CCCH (Common Control Channel) and revises the communication carrier frequency of its own base station equipment 300 to avoid crosstalk when the communication carrier frequency of its own base station equipment 300 is coincident with the communication carrier frequency used for other base station equipment 300. When the umber of communication carrier frequencies used in this radiotelephoney system is larger than the number equivalent to the density of each base station equipment 300, the optimum frequency allocation is realized by the control of a communication control section 305. Thus, interference with other base stations is prevented by revising the communication carrier frequency of its own base station.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to multi-carrier time division multiple access (Ti
ce Division Multiple Access
The present invention relates to a method for dynamically allocating a carrier frequency for communication in a digital cordless telephone system that performs communication using the SS (hereinafter referred to as TDMA) method.

BACKGROUND OF THE INVENTION In recent years, mobile communications have become widespread, and in particular, the spread of cordless telephones, car telephones, MCA systems, etc. is remarkable.

Cordless telephones are mainly used in small-scale indoor mobile radio telephone systems, such as PBX cordless systems, and the current cordless telephones in Japan have a connection between a mobile station and a base station that is wired to the fixed telephone network. Frequency division multiple access (Frequency division multiple access), which performs one-to-one wireless communication using a specific frequency between
n Multiple Access, hereinafter referred to as F DM
The method (denoted as A) has been adopted.

In this FDMA cordless telephone system, for example, there are 2 system common control channels (hereinafter referred to as Cch) used for connection fees between the base station and mobile stations, and 2 channels between the base station and mobile stations. There are 87 communication channels (hereinafter referred to as Sch) used for transmitting communication signals between Sc
h, and the call is made by moving to S ch that is confirmed to be available.

In this FDMA cordless telephone system, both the base station and mobile station are always in standby mode on Cch, and a method is adopted in which the Sch is dynamically selected each time a call is made, and the planned frequency allocation is used. Multiplex communication is performed by dividing the Sch frequency band at regular intervals.

On the other hand, in large-scale systems such as car phone systems and MCA systems, which are mainly provided for outdoor land mobile communications, a huge number of 5chOs are required by simple frequency division multiplexing, so line design is required. After conducting field and line experiments, base station location design and interference between each base station are considered, and the Sch frequencies to be allocated to each base station are planned and allocated.

By the way, in the above-mentioned cordless telephone systems and car telephone systems based on digital systems, one base station can access multiple mobile stations, thereby reducing the number of installed base stations and reducing the costs associated with base stations. In order to be able to cope with an increase in the number of subscribers without increasing the number of base stations, adoption of the TDMA system is being considered.

When adopting the TDMA method for the current digital cordless phone system or car phone system, the latter car phone system has multiple Sch frequencies assigned to each base station, as mentioned above. The planned layout has already been carefully considered,
The interference protection ratio between Schs of each base station is guaranteed.

Therefore, even if the TDMA method is adopted in the current car telephone system, the interference protection ratio between Schs of each base station is guaranteed, so it is possible to cope with the conventional system.

Problems to be Solved by the Invention However, in the above-mentioned conventional cordless telephone system, each mobile station that performs one-to-one wireless communication with a base station uses Sch of a different frequency. Since mutual interference between stations is avoided, frequency planning, station placement design, and interference protection ratio between each base station are not guaranteed.

Therefore, if the TDMA system is adopted in this state, there is no standard for Sch allocation between each base station, and multiple mobile stations share the Sch of the same frequency.
(mobile station n to base station 1), and suppose that two base stations in close proximity to each other and individual mobile stations accessing the same Sch If Sch
Even when the electric field strength is strong, there is a problem that the mobile station may not be able to receive Sch from the base station due to mutual interference. /Also, as mentioned earlier, in conventional cordless telephone systems, the mutual interference ratio between each base station is not guaranteed, so in order to avoid the above-mentioned interference, the service area of each base station, i.e. There is a problem in that it is necessary to make the wireless zone smaller or to carefully design the station placement.

Furthermore, since the physical channel in the TDMA system is defined by time slots, the Sch
Choose an FDMA cordless phone system
When adopting the DMA method, it is necessary to search for a pair of Sch and time slot of a frequency with little interference with other mobile stations for each call, and the time required for access between the base station and the mobile station is The problem is that it becomes long.

Based on this search result, the synthesizer of each base station determines whether it is necessary to switch the frequency in units of one time slot, and if the synthesizer performs such frequency switching, the switching operation of the synthesizer will be frequent. This switching increases the necessary guard time on each Sch, that is, the time during which wireless communication cannot be performed, which causes a problem in that line utilization efficiency decreases.

In order to prevent the above-mentioned decline in line usage efficiency, it is essential to plan the frequency allocation like the conventional car phone system mentioned above, but especially for cordless phone systems mainly intended for indoor use, such as PBX cordless systems. However, when planning the frequency allocation, it is necessary to conduct detailed radio wave propagation experiments within a structure such as a building where the system is installed, which increases the system cost.

The present invention solves the above-mentioned conventional problems, and monitors the communication carrier frequencies used by other base stations to determine whether or not the communication carrier frequencies of the own base station and the other base stations match. When it detects a match with the communication carrier frequency of another base station, it reselects the communication carrier frequency of its own base station. In addition to preventing interference with other base stations, the carrier frequency for communication of the own base station is selected in advance so as to prevent interference with other base stations, and the time required for access with a mobile station is determined. Dynamic carrier frequency allocation for communication allows easy introduction of TDMA into existing FDMA cordless telephone systems without the need for station location design or frequency planning for communication carriers. The purpose is to provide a method.

Means for Solving the Problems In order to achieve the above object, the present invention provides a plurality of base stations connected via wired lines to a center station connected to a fixed telephone network, and mobile devices that receive services from these base stations. A communication carrier that allows each base station to select a frequency from among a plurality of frequencies for communication via mobile radio lines between base stations, and a frequency that is different from those base stations for transmitting control signals. A multi-carrier time division multiplex/time division duplex communication method using a common control carrier between the base stations is used, and each base station transmits frequency information of the communication carrier currently in use at that base station. A broadcast signal containing the current frequency information of a communication carrier is transmitted intermittently on a control carrier, and each base station receives the broadcast signal transmitted from other base stations and transmits the broadcast signal on a control carrier. The current frequency of the communication carrier of the base station is recognized, and each base station compares and contrasts the current frequency of the communication carrier of its own base station with the current frequency of the communication carrier of other base stations.
Based on the comparison results, the communication carrier frequency of the own base station is reselected.

Further, in order to achieve the above object, the present invention receives a call control signal that is sent from a mobile station to another base station and includes communication carrier current frequency information of another base station. The current frequency of the communication carrier is now recognized.

Therefore, according to the present invention, the communication carrier frequencies used by other base stations are monitored to detect whether or not the communication carrier frequencies of the own base station and the other base stations match. When a match with the communication carrier frequency of the station is detected, the communication carrier frequency of the own base station is reselected, thereby changing the communication carrier frequency of the own base station and preventing interference with other base stations. In addition, it is possible to select the communication carrier frequency of the own base station in advance to prevent interference with other base stations, thereby reducing the time required for access with a mobile station. , there is no need for station location design or frequency planning for communication carriers, and TD can be added to existing FDMA cordless telephone systems.
The MA method can be easily introduced.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. In addition, in this embodiment, a method (hereinafter referred to as TDMA/TDD method) that simultaneously realizes TDMA type communication and time division duplexing (hereinafter referred to as TDD) type communication on one carrier is used. 8-channel multicarrier TDMA/TDD
The explanation will be given by taking as an example a wireless telephone system that performs multiplex communication based on a method.

1. About the System The wireless telephone system discussed in this embodiment has multiple base stations as interfaces with mobile radio lines at the center station, which is the key station of the wireless telephone system connected to the fixed telephone network. The configuration is such that each base station device is connected to a wireless telephone device via a mobile radio line, and the chain line communication between each base station device and the wireless telephone device is T.
By using the DMA/TDD method, each base station device can be connected to a maximum of eight wireless telephone devices.

1-1. (1) FIG. 1 is an explanatory diagram showing the overall configuration of the above-mentioned TDMA-based chain-line telephone system.

In FIG. 1, 1 is a fixed telephone network, 2 is a center station which is a key station of the wireless telephone system, and a line control device 200 is installed to connect the lines in the chain line telephone system to the fixed telephone network 1. has been done.

Reference numeral 3 denotes base stations that are appropriately installed at multiple locations within the service area of the wireless telephone system in order to transmit calls from the fixed telephone network 1 into the service area of the wireless telephone system. A base station device 300 is installed as a chain line transmitting/receiving device, which is connected to the center station 20 and the line control device 200 via a wired line 10.

4 is a mobile station that performs wireless transmission and reception with the base station 3 via the mobile radio line 20, and in a radio telephone system such as this embodiment, the radio telephone device 400 corresponds to the mobile station 4. It is something.

In the wireless telephone system with the above configuration,
By accessing the base station device 300 of the nearest base station 3, each mobile station 4, that is, the telephone equipment FT400 of the mobile station 4, uses the line control device 200 of the center station 2 as an interface to connect the mobile station 4 to the fixed telephone network 1, , mobile station 4 vs. mobile station 4
You can now make calls.

Signal transmission between the line control device 200 and each base station device 300 via the wired line 10 involves transmitting signals from the fixed telephone network 1 to the number of base station devices 300 connected to the line control device 200. This is done by time-sharing the same number of times.

There are four transmission formats in this wired line 10: superframe (hereinafter referred to as SF), multiframe (hereinafter referred to as MF), frame (hereinafter referred to as FR), and channel (hereinafter referred to as CH). It consists of layers.

The transmission format on the wired line 10 consisting of these four layers will be explained below based on FIG. 2.

As shown in the upper part of FIG. 2, signal transmission between the line control device 200 and each base station device 300 is performed based on SF. This SF has m MPs (MF
I to MFm), where m indicates the number of base station devices 300 connected to the line control device 200.

Therefore, each MF corresponds to each base station device 300, and when the above SF is time-divided into m MPs by the line control device 200, each MP corresponds to the first base station device 300, and MF1 corresponds to the first base station device 300. Then, the MF2 sends the second base station device 300...
The configuration is such that the information is output to each base station apparatus 300 in response to the following.

As shown in the middle part of Figure 2, each MP is composed of PRs (F-R1 to FRk) per MF, and the value of k is determined by The number is set so that the period of one TDMA frame, which is the transmission format on the mobile radio line 20, and the period of one MF, which will be explained in "Transmission Format on Line", are the same period.

On the other hand, each FR is configured with 10 CHs (CHQ to CH9) per FR, as shown in the lower part of FIG.
00, CHI to CH8 serve as communication channels for transmitting communication signals, and CH9 serves as a communication channel for transmitting control signals such as line connection control. Each channel is assigned as a control channel for each channel.

As described above, the transmission format in the wired line 10 is composed of four layers, and the wired line A11
0 via the line control device 200 and each base station device 300
Transmission between the two is performed in SF units.

As mentioned earlier, each base station device 300 and each eagle #!
Signal transmission between the telephone device 400 and the mobile radio line 20 is carried out using 8 channels of TDMA/TDD system, which realizes both time division multiplex communication and time division duplex communication on one carrier. This is done by multiplex communication.

The following two carriers are allocated to each base station device 300 as signal transmission carriers on the mobile radio line 20.

First, each base station device 300 and wireless telephone device 400
This is a control carrier with a frequency common to all base station devices 300 in this wireless telephone system, which is used to transmit broadcast signals and call control signals to and from the wireless telephone system.

Second, each base station device selects a frequency from among a plurality of frequencies that are used to transmit communication signals between each base station device 300 and the radio telephone device 400 and is allocated to the entire radio telephone system. 300 is a communication carrier that is set by arbitrarily selecting one frequency.

Here, regarding the nature of the above-mentioned notification signal and incoming/outgoing signal,
Let me explain briefly. First, the broadcast signal (Broadca
st Control Channel, hereinafter referred to as BCC
H) is transmitted from each base station device 300 to the wireless telephone device 400 and other base station devices 300 within the wireless zone of the own base station device 300; This is a signal to notify the communication carrier etc. currently being used.

On the other hand, incoming and outgoing call control signals (Common Control
Channel (hereinafter referred to as CCCH) is a channel from each base station device 300 to the wireless telephone device 400 within the wireless zone of its own base station device 300, or from each wireless telephone device 400 to the nearest base station device 300. This is a signal for each base station device 300 and radio telephone device 400 to control the connection between each other via the mobile radio line 20.

Signal transmission on the mobile radio line 20 is carried out over the wired line 1.
Similarly to the signal transmission on the mobile radio line 20, the SF in the transmission format on the mobile radio line 20 side is composed of m TDMA frames as shown below.

1-3- <1), TDMA frame Figure 3 This TD
MA frame is a general 8 channel TDMA/TD
This is used in the D-scheme transmission format, and as mentioned above, its cycle matches the cycle of one MP in the transmission format on the wired line 10. The contents are shown in Figure 3.

As can be seen from FIG. 3, the above TDMA frame is T
In order to realize DD system signal transmission, the first half is for base station device 300 transmission/wireless telephone device 4°O reception (downlink), and the second half is for wireless telephone device 4°O transmission/base station device 300 reception (uplink). In order to realize 8-channel TDMA signal transmission, a total of eight slots (hereinafter referred to as SLI to SL8) are allocated to the first to eighth slots (hereinafter referred to as SLI to SL8) for each of the first and second halves. SL).

Then, on the downlink, SLl is a BC signal that is normally always sent from the base station device 300 to the wireless telephone device 400.
CH and a CC sent from the base station device 300 to the wireless telephone device 400 as necessary when mutually connecting.
SL2 to SLg are allocated for sending out communication signals sent from the base station device 300 to the radio telephone device 400.

In addition, in the uplink, the SLI is allocated from the radio telephone device 400 to the base station device 300 for transmitting the CCCH, which is transmitted as necessary when connecting each other.
2 to SL8 from the i-telephone device 400 to the base station device 3.
It is allocated for sending communication signals sent to 00.

Therefore, in the above TDMA frame, the transmission of both the BCCH and CCCH signals in the downlink and uplink SL1 is as follows.
This is carried out using a common control carrier for this wireless telephone system,
Transmission of communication signals in downlink and uplink SL2 to SL8 is performed using a communication carrier selected for each base station device 300.

Note that the SLI described above is performed when communication signals are being transmitted in all SLs from SL2 to SL8, that is, multiplex communication between seven wireless telephones 400 and the base station device 300 is already being performed on the communication carrier. When the base station device 300 is connected to the wireless telephone device 400 at the 8th station,
When accessing by transmitting and receiving CH and CCCH,
After this access, the carrier is changed from a control carrier to a communication carrier so that it can also be used as an SL for transmitting communication signals.

In this case, the S
Transmission of communication signals performed on the LI is transferred to a vacant SL, and this SLl is restored as a transmission SL by a control carrier for transmitting BCCH and CCCH.

Each base station device 300 performs signal transmission with the radio telephone device 400 based on the transmission format in SF units as described above. Among them, m-1 TDMA frames are TDMA frames that do not have the right to transmit BCCHSCCCH between the base station device 300 and the wireless telephone device 400.
TDM that is set as an A frame and has the right to transmit BCCH and CCCH between the base station device 300 and the wireless telephone device 400 in only one remaining TDMA frame.
It is set as an A frame.

This is to avoid collisions due to overlapping use of control carriers common to each base station device 300, and in a TDMA frame that does not have transmission rights, other base station devices 300 and wireless telephone devices BCCHSCCCH transmitted and received by control carrier between 400 and 400
is received, and communication signals are transmitted and received using communication carriers in the areas SL2 to SL8.

The transmission format on the mobile radio line 20 in each base station device 300 as described above will be explained in detail with reference to FIG. 4.

FIG. 4 represents the transmission format on the mobile radio lines 2 and 0 in each base station apparatus 300, and shows the mobile communication format of the first base station apparatus 300, in which the signal from the line control apparatus 200 is inputted by MFI. It shows the transmission format on the wireless line 20.

In FIG. 4, of the two horizontal axes, the upper row represents signal transmission by the control carrier, and the lower row represents signal transmission by the communication carrier. Furthermore, the numbers surrounded by frames represent SLI to SL8, respectively.

Furthermore, in each SL in FIG. 4, those located on the horizontal axis representing control carriers and communication carriers are SLs that transmit signals transmitted from base station device 300.
, and those located below the horizontal axis representing control carriers and communication carriers represent SLs that transmit signals received by base station device 300.

Furthermore, in the following description of FIG. 4, "transmission" and "reception" refer to operations seen from the first base station apparatus 300 side.

According to this, the first TDMA frame having the right to transmit BCCH and CCCH is first set in the SF of the first base station device 300.

The downlink SLl in this first TDMA frame is
It is allocated for transmission of the BCCH sent from the first base station device 300 to the radio telephone device 400, and the control carrier frequency is used in the transmission.

Then, when the wireless telephone device 400 within the transmission/reception area (hereinafter referred to as a wireless zone) of the first base station device 300 and the first base station device 300 access, this SLl replaces the BCCH. It is also allocated for the transmission of the CCCH to be sent out. In addition, CCC in this case
The control carrier frequency is also used for H transmission.

Subsequently, downlink SL2 in the first TDMA frame
SLg to SLg are assigned for transmitting communication signals sent from the first base station device 300 to the radio telephone device 400, and a communication carrier frequency is used in the transmission.

Additionally, the above downlink SL2 to SLg are exceptionally connected to the wireless telephone device 400 within the wireless zone of the first base station device and the first base station device.
It is also used to transmit a CCCH for a start instruction sent from the first base station device 300 to the wireless telephone device 400 when the first base station device 300 accesses the wireless telephone device 400, and in the transmission, the communication carrier frequency is used.

On the other hand, the uplink SLI in the first TDMA frame is used for receiving CCC)T sent from the wireless telephone device 400 to the first base station device 300 when accessing the first base station 300. The reception is performed on the frequency of the control carrier.

Subsequently, uplink SL2 in the first TDMA frame
SLg to SLg are assigned for receiving communication signals sent from the radio telephone device 400 to the first base station device 300, and the reception is performed at the frequency of the communication carrier.

As mentioned above, in this first TDMA frame part,
SL for transmission and SL for reception at 1/2 TDMA frame interval
8-channel TDMA/TDD system signal transmission is performed in this TDMA frame.

Furthermore, after this first TDMA frame, the BCCH from the base station device 300 or the wireless telephone device 400
and the second to m-th TDs that do not have CCCH transmission rights.
The MA frame follows, and since these frames have the same configuration, the second TDMA frame will be described as a representative one.

First, since the downlink SLl in the second TDMA frame does not have the transmission right for BCCH and CCCH as described above, the other first, third to m-th base station devices 30
．． BCC sent from 0 to wireless telephone device 400
It is assigned for monitoring reception of H and CCCH, and the reception is performed at the frequency of the control carrier.

Note that the monitors of the BCCH and CCCH sent from the other first, third to m-th base station devices 300 to the wireless telephone device 400 are located within the wireless zone of the second base station device 300. B transmitted from each base station device 300
This is done on CCHSCCCH.

Subsequently, downlink SL2 in the second TDMA frame
SLg to SLg are assigned for transmitting communication signals sent from the first base station device 300 to the radio telephone device 400, and a communication carrier frequency is used in the transmission.

On the other hand, the uplink SL1 in the second TDMA frame is similar to the downlink SLI described above, since this second TDMA frame does not have the right to transmit BCCH and CCCH.
It is assigned for monitoring and receiving the CCCH transmitted from the radio telephone device 400 to the other first, third to m-th base station devices 300, and the reception is performed at the frequency of the control carrier.

Note that monitoring of the CCCH transmitted from the wireless telephone device 400 to the other first, third to m-th base station devices 300 is performed by wireless telephones existing within the wireless zone of the second base station device 300. This is performed regarding the CCCH sent out from the device 400.

Subsequently, uplink SL2 in the second TDMA frame
SLg to SLg are assigned for receiving communication signals sent from the radio telephone device 400 to the first base station device 300, and the reception is performed at the frequency of the communication carrier.

Thereafter, a third TDMA frame with the same content as this second TDMA frame is
The mth to mth TDMA frames are successively transmitted to the mobile radio line 2.
One SF in the transmission format above is configured.

So far, we have explained the transmission format of the first base station device 300, but the remaining
The transmission format of each of the m-th base station apparatus 300 is also generally the same as the transmission format of the first base station apparatus 300.

Therefore, only the differences between the transmission format of the first base station apparatus 300 and those of the other base station apparatuses 300 will be briefly explained with reference to FIG. In 300, the arrangement of TDMA frames having the right to transmit BCCH and CCCH is sequentially shifted backward by 1 TDMA frame with respect to the first base station device 300, and MP2 to MFm in the transmission format on the wired line 10, respectively. It can be seen that the settings are synchronized with the timing of

Transmission between the base station device 300 and the radio telephone device 400 is performed via each of the downlink and uplink SL1 to SL8.
This is performed in bursts in the area of BCCH,
Separate transmission formats are defined for CCCH transmission and communication signal transmission, respectively.

Therefore, the control S on which BCCH and CC-CH are transmitted is
FIG. 6 shows an example of the transmission format of the burst signal of L (downlink and uplink SL1), and an example of the transmission format of the burst signal of the communication SL (downlink and uplink SL2 to 5L8) through which communication signals are transmitted. It is shown in FIG.

As shown in Figures 6 and 7, both formats have a guard space (hereinafter referred to as GS) at the beginning to avoid collision with the adjacent SL, and a radiated over a wide band,
A ramp portion (hereinafter referred to as R) for suppressing the level of the interference spectrum is set to have the same length.

Since BCCH and CCCH are not transmitted continuously on the control SL, it is necessary to establish bit synchronization on the receiving side. Therefore, as shown in Figure 6, the control SL In the transmission format, the above R
A preamble signal (hereinafter referred to as PA) is assigned after.

In addition, in the above control SL, after PAO, a unique word (hereinafter referred to as UW) and a base station number (hereinafter referred to as FS
#), BCCH or CCCH, a parity bit for error control (hereinafter referred to as Parjty), and finally R is assigned again.

On the other hand, the transmission format of the communication SL is as shown in FIG. 7, after the GS and H common to the control SL,
PA, UW, FS#, which are shorter than PA in the CCH and CCCH transmission formats, and a low-speed associated control channel (hereinafter referred to as 5ACCH) for transmitting control signals during communication are allocated.

In addition, after the above 5ACCH, there is a traffic channel (hereinafter referred to as TC
) (or TC) Fast Associated Control Channel (FACC) for stealing I and sending out control signals.
An area for transmitting either H) is allocated.

l-3-(4), BCCH, CCC) (Here, the specific contents of the BCCH and CCCH will be briefly explained.

As mentioned earlier, BCCH is transmitted from each base station device 3oO to the wireless telephone device 40 within the wireless zone of its own base station device 300.
This is a signal that is always sent to mobile radio line 20 and indicates the conditions under which communication is possible on the current mobile radio line 20.

The BCCH is composed of the number of the base station device 300 (base station 3) that is transmitting this BCCH, the communication carrier frequency currently in use, and the available slot (SL) number in the TDMA frame. There is.

On the other hand, the CCCH is transmitted from each of the base station device 300 and the wireless telephone device 400 when a call is made from each wireless telephone device 400 or when a call is received to each wireless telephone device 400, and is used for actual communication. This is a signal for selecting and determining conditions.

The CCCH is the number of the base station device 300 (base station 3) or radio telephone device 400 (mobile station 4) that is transmitting this CCCH, and the communication carrier currently used by the base station device 300. Frequency and available slots in the TDMA frame) (SL) number (when transmitted from the base station device 300 side) or desired slot to use
(SL) number (when sent from the wireless telephone device 400 side)
, or the determined communication slot number (when sent from the base station device 300 side).

When forming a call to the wireless telephone device 400 in this wireless telephone system according to the transmission format on the wired line 10 and the transmission format on the mobile radio line 20 described above, the line control device 200, the base station device 300 .
and wireless telephone device 400 performs various operations.

Therefore, these line control equipment 200, base station equipment 300. The configuration and general operation of the wireless telephone device 400 will be explained with reference to FIGS. 8, 9, and 10.

2-11 Line Control The line control device 200 connects the mobile radio line 20 to the fixed telephone network 1 via the base station device 300 installed in each base station 3.
The transmission signal from the above-mentioned fixed telephone network 1 is time-divided to m MFs for each SF period, and the transmission signal from each MP is sent to each base via the wired line 10. It is transmitted to station equipment f300.

In addition, this line control device 200 is configured to operate each base station device 300 in a dependent manner in accordance with the time-division timing of the transmission signal, and to control the periodic timing of the TDMA frame in the transmission format on the mobile radio line 20 and the above-described timing. It generates and sends out a reference clock for synchronizing time division timing.

2-1-(1),
8) A schematic configuration of the line control device 200 as described above will be explained based on FIG.

In FIG. 8, 201 is a subscriber line interface unit as an interface with the fixed telephone network N1, and the voice signal (
A voice encoding circuit (not shown) that encodes a communication signal (communication signal) is built-in.

Reference numeral 202 denotes a base station interface section provided in each base station 3 as an interface with each base station 3, each of which consists of an 8-channel multiplexing/demultiplexing circuit corresponding to a normal 8-line bidirectional trunk circuit. It is.

203, a plurality of subscriber line interface units 201;
It is a time switch unit to which a plurality of base station interface units 202 are connected, and each base station interface unit 20
2 to the subscriber interface unit 201, that is, each base station 3 (base station device 300) is connected to the fixed telephone network 1 in a time-division switching manner at SF intervals.

A synchronization control unit 204 is connected to the time switch unit 203 and each base station interface unit 202, and generates a clock that serves as a reference timing for time division switching connection of the time switch unit 203, and transmits the clock to the time switch unit 203. supply

Further, the synchronization control unit 204 supplies the generated clock to all base stations 3 via each base station interface unit 202, and controls the plurality of base station devices 300 of each base station 3 based on the clock. The slave operation is performed in accordance with the time division timing of the switch section 203.

205 is the subscriber line interface section 201, the base station interface section 202, and the time switch section 20.
It is an exchange control unit connected to the subscriber line interface unit 201 and the base station interface unit 202, and analyzes the dial signal and selects the route of the transmission signal, that is, determines the routing, etc. based on the signals input from the subscriber line interface unit 201 and the base station interface unit 202. and outputs the result to the time switch unit 203.

2-1-(2) In creating a line control device, the operation of the line control device 200 with the above configuration related to signal transmission will be briefly explained.

In the line control device 200 configured as described above, when a transmission signal in which a communication signal and a control signal are multiplexed is input from the fixed telephone network 1, the subscriber line interface section 20
The communication signal portion of the human input signal is encoded by the voice encoding circuit No. 1 and input to the time switch unit 203 .

The time switch unit 203 time-divides the transmission signal input from the subscriber line interface unit 201 into m MF units for each SF period based on the clock from the synchronization control unit 204, and Based on the transmission format of the line 10, time-divided MP transmission signals are sequentially output to each base station interface section 202.

That is, the transmission signals time-divided by the time switch unit 203 into MF1, MF2, . 202,...
, the m-th base station interface unit 2O2, and so on.

As a result, the signal from the landline telephone [1st class] is distributed to each base station device 300,
No matter which base station device 300 the user is in the wireless zone of, it is possible to access the nearest base station device 300.

On the other hand, when the transmission signal by MF from each base station device 300 is input, the timing of each MP is changed to each base station device 300.
1 MP for every 0! Since the time switch 203 synchronizes with the input timing of each MF and connects the wired line 10 to the fixed telephone network 1, the transmission signal from each base station device 300 is transmitted to the fixed telephone I without exception.
81.

2-2. base. - The base station device 300 is provided in each base station 3 as a silver wire transmitting and receiving device for performing wireless transmission and reception with the radio telephone device 400 of the mobile station 4, and as described above,
8 of the TDMA/TDD system between the wireless telephone device 400 and
It performs channel multiplex communication. That is, a maximum of eight wireless telephone devices 400 can be accessed at the same time.

As can be seen from the relationship between the transmission format on the wired line 10 and the transmission format on the mobile radio line 20 described above, the base station apparatus 300 receives the transmission signal input from the line control apparatus 200 by the MF. based on,
m TDMs whose period matches the timing of the MP period
An SF composed of A frames is assembled to perform wireless transmission and reception with a wireless telephone device 400 via a mobile chain line 20.

Therefore, the present base station device 300 has the above-mentioned line control device 2.
It operates in a subordinate manner to the line control device 200 based on the clock given from 00.

-2-(1), Base (Fig. 9) The schematic configuration of the base station device 300 as described above will be explained based on Fig. 9. In the following explanation, "downward direction" means It is assumed that signal transmission from the wired line 10 to the mobile radio line 20 is shown, and "upward direction" indicates the opposite direction.

In FIG. 9, 301 is a demultiplexing unit connected to the base station interface unit 202 of the line control device 200 via the wired line 4, and similarly to the base station interface unit 202 described above, it is connected to the base station interface unit 202 of the line control device 200. It consists of an 8-channel multiplex circuit corresponding to a forward trunk circuit.

In the downlink direction, this demultiplexing section 301 is connected to the synchronization control section 2 via the base station interface section 202.
The clock generated in step 04 and the transmission signal by the MP from the line control device 200 are input, and the input transmission signal by the MF is decomposed into FR units.
The control signals transmitted in the area and the CHl to C of each PR
It is separated into communication signals transmitted in the H8 region.

302 is connected to the demultiplexing section 301, and the synchronization control section 2 on the line control device 200 side is connected to the demultiplexing section 301 via the demultiplexing section 301.
04 is a synchronization control unit that is manually operated, and generates timing pulses necessary for slave synchronization of the own base station device 300 to the line control device 200 based on this clock.

303 is a control signal conversion unit connected to the demultiplexing unit 301 and receiving the control signal from the line control device 200 separated by the demultiplexing unit 301 in the downstream direction;
04 is connected to the demultiplexer 301, and in the downstream direction, the line control device 2 separated by the demultiplexer 301 is connected to the demultiplexer 301.
This is a traffic channel buffer 7 memory unit (hereinafter referred to as TCH buffer memory unit) into which the communication signal from 00 is input.

A communication control unit 305 is connected to the control signal conversion unit 303 and arbitrarily sets a communication carrier to be used in the own base station device 300 when starting up the wireless telephone system.

In the downlink direction, the communication control unit 305 connects the fixed telephone network 1 and the wireless telephone device 400 based on the control signal input from the demultiplexing circuit 301 to the control signal conversion unit 303.
CCCH that controls connection with the wireless telephone device 400 and sends out to the wireless telephone device 400 for incoming and outgoing control, and the base station device 30
This is to generate a BCCH for broadcasting the communication carrier frequency used in 0.

306 is a timing pulse from the synchronization control unit 302, a communication signal from the TCH buffer memory unit 304, and a BCCH from the communication control unit 305 in the downstream direction.
TDMA/TDD, in which the CCCH is input, and in the uplink direction, a transmission signal from the wireless telephone device 400 is input, which is received by a receiving unit 320, which will be described later.
This is the processing section.

In the downstream direction, this TDMA/TDD processing section 306 includes a TCH buffer memory section 304 and a communication control section 3.
Communication signals, B CCH, and CC input from 05
Based on the CH, the contents of the TDMA frame for transmitting the signal to the wireless telephone device 400 are determined.

Then, the determined TDMA frame or this TDMA
Wireless telephone device 400 based on SF composed of frames
A transmission signal for the synchronization control section 302 is output at the timing of the timing pulse from the synchronization control section 302.

Furthermore, in the upstream direction, the TDMA/TDD processing section 306 processes the BCC of the transmission signal from the wireless telephone device 400 etc. that is input from the receiving unit 320, which will be described later.
H%CCCH to communication control unit 305, communication signal to TCH
Each of the signals is output to the buffer memory section 304.

In addition, in upstream signal transmission, the above TDMA/TD
The TCH buffer memory unit 304 to which the communication signal from the D processing unit 306 is input temporarily stores this communication signal, and
It is sent to the demultiplexer 301 in accordance with the MF cycle in the transmission format on the wired line 10.

On the other hand, the BCC from the TDMA/TDD processing unit 306
The communication control unit 305 to which the HSCCCH is input, the details of which will be explained in "2-2-(2)b, Signal transmission/reception operation for mobile radio line (downlink, uplink)", receives the BCCH, CCCH. The following processing is performed depending on the content.

First, the wireless telephone device 400 for the base station device 300
When the CCCH is input from the communication control unit 30
5 outputs the CCCH to the radio telephone device 400 in response to this, and further outputs a control signal for controlling the connection between the radio telephone device 400 and the fixed telephone network 1 to the control signal conversion unit 303.

On the other hand, the wireless telephone device 40 for another base station device 300
When the CCCH from 0 or the BCCH and CCCH for the wireless telephone device 400 within the wireless zone of this base station device 300 are input from another base station device 300, this B
Registers and monitors communication carrier frequencies used in other base station devices 300 that are included in CCHSCCCH, and transmits information to own base station device 300 according to the usage status of communication carrier frequencies in other base station devices 300. Change the frequency of the communication carrier used.

The demultiplexer 301 receives the control signal from the control signal converter 303 and the communication signal from the TCH buffer memory unit 3O4 in the downstream direction, and multiplexes these signals using predetermined channels CH1 to CH9. turned into
It is transmitted on the wired line 10 at approximately MFm.

Incidentally, a transmitting unit 310 and a receiving unit 320 for performing wireless transmission and reception with the wireless telephone device 400 are connected to the TDMA/TDD processing section 306 .

Therefore, the transmitting unit 310 and the receiving unit 32 are explained below.
The configuration with 0 will be explained.

First, in the transmitting unit 310, 311 is a TDM
Connected to the A/TDD processing unit 306, TDMA/TDD
a modulation unit 312 that modulates the transmission signal from the processing unit 306;
is a transmitting unit connected to this modulating unit 311 and transmitting a modulated transmission signal to the radio telephone device 400 via the antenna 330 and the mobile radio line 20.

On the other hand, in the receiving unit 320, 321 is connected to the wireless telephone device 40 via the mobile wireless line 20 and the antenna 330.
A receiving unit 322 to which the transmission signal from 0 is input is connected to this receiving unit 321 and receives the received radio telephone device 40.
The digital signal demodulated from the transmission signal from 0 is TDM
This is a demodulation unit that outputs to the A/TDD processing unit 306.

In addition, the transmitting section 312 and the receiving section 321, and the antenna 3
30 is connected to the TDMA/TDD processing section 306, and the transmission section determines the connection direction based on the timing pulse input from the synchronization control section 302 (based on the instruction from the TDMA/TDD processing section 306). 312 side and receiving section 32
An antenna switch 340 is interposed to switch between the two sides.

This antenna switch 340 is for switching the transmission and reception states of the base station device 300 in accordance with the SL timing of the TDMA frame in the transmission format on the mobile radio line 2o.

Further, the transmitting section 312 and the receiving section 321 each include frequency changeover switches 313 and 32 to which timing pulses from the TDMA/TDD processing section 306 are input.
3 is connected, and this frequency changeover switch 31
3.323 are connected to fixed frequency oscillation circuits 314 and 324 that each oscillate a fixed frequency, and synthesizer sections 315 and 325 that oscillate a variable frequency, respectively.

The fixed frequency oscillation circuits 314 and 324 are connected to the transmitter 31
When the fixed control carrier frequency assigned to this wireless telephone system is transmitted and received by the transmitter 312 and the receiver 321, a fixed frequency matching the control carrier frequency is transmitted, and the transmitter 312 and the receiver 321 It is intended to supply

Note that the transmission unit 310 has both a fixed frequency oscillation circuit 314 for the control carrier frequency and a synthesizer section 315 for the communication carrier frequency, but the fixed frequency oscillation circuit 314 for the control carrier frequency The configuration may be such that the two transmitting units, a first transmitting unit having only a synthesizer section 315 for communication carrier frequency and a second transmitting unit having only a synthesizer section 315 for communication carrier frequency, are switched as appropriate. This also applies to the receiving unit 320 described above.

Furthermore, since the fixed frequency oscillation circuits 313 and 323 are for transmitting a fixed frequency, for example, a crystal oscillation circuit or a synthesizer circuit may be used.

Furthermore, when the transmitting section 312 and the receiving section 321 transmit and receive the communication carrier frequency arbitrarily selected by the communication control section 305, the synthesizer sections 315 and 325 are configured to select an arbitrary frequency that matches the communication carrier frequency. It transmits a frequency and supplies it to the transmitting section 312 and the receiving section 321.

For this reason, each synthesizer section 315, 325 is configured to receive the selection result of the communication carrier frequency from the communication control section 305, and change the oscillation frequency according to this selection result. ing.

2-2- (21. Construction of the base) Next, the operation related to signal transmission of the base station device 300 with the above configuration will be briefly explained.

In the base station device 300 configured as described above, the communication system g
The communication carrier frequency has already been selected and set by the JJ unit 305 at the time of startup of this wireless telephone system, and based on this, the synthesizer units 315 and 325 of each of the transmitting unit 310 and the receiving unit 320 control the communication control unit 305. It oscillates at a frequency that matches the communication carrier frequency selected and set.

In this state, if there is a signal transmitted by the MP from the line control device 200 or a clock, the input signal transmitted by the MF is decomposed into PR units in the demultiplexer 301, and the area of each PR (7) CH9 is and the communication signals transmitted in the CH1 to CH8 regions of each PR.

The control signal is output to the control signal converter 303, the communication signal is output to the TCH buffer memory unit 304, and the clock is output to the synchronization control unit 302.

Based on the input of the clock, the synchronization control unit 3.2 generates a timing pulse and sends the TDMA/TDD processing unit 306 to the base station device 300 in order to operate the base station device 300 as a slave to the line control device 200 and generate a TDMA frame. Output to.

On the other hand, based on the input of the control signal, the control signal converter 3
03 outputs this control signal to the communication control section 305, and the TCH buffer 7 memory section 304 outputs this communication signal to the TDMA/TDD processing section 306 based on the input of the communication signal.

The communication control unit 305 to which the control signal from the control signal conversion unit 302 is input controls the connection between the fixed telephone 1 and the wireless telephone device 400 based on the control signal, and connects the wireless telephone device 400 to the wireless telephone device 400 for connection control. TDMA/TDD processing unit 306
Output to.

A communication signal from the TCH buffer memory section 304,
Based on this manually input signal, the TDMA/TDD processing unit 306 to which the BCCH SCCCH from the communication control unit 305 is inputted, converts the data into the transmission format on the mobile silver line described in 11-3-<2) above. As I did,
One TDMA frame with transmission rights for BCCH and CCCH, and m- frame without transmission rights for BCCHSCCCH.
One TDMA frame is determined.

Then, the TDMA/TDD processing unit 306 processes the determined m TDMA frames, that is, S
The transmission signal by F is output to the modulation section 311.

Furthermore, the TDMA/TDD processing section 306 is on the synchronization side (
Based on the timing pulse from the company section 302, the antenna switch 340 is switched and controlled as follows.

First, the antenna switch 340 is connected to the transmitter 31 in the entire downlink region of the TDMA frame that has the right to transmit BCCHSCCCH, and the downlink region SF2 to SF8 of the TDMA frame that does not have the right to transmit the BCCHSCCCH.
Switch to side 2.

Second, in the entire upstream area of the TDMA frame that has the right to transmit BCCH and CCCH, and the entire upstream area and the downstream SLl area of the TDMA frame that does not have the right to transmit the BCC) (SCCCH), the antenna switch 340 receives 321 side.

Thirdly, the TDMA/TDD processing section 306 performs each downlink and uplink S in each TDMA frame of the transmission signal to be output based on the timing pulse from the synchronization control section 302.
In the LI region, the frequency changeover switch 3
13.323 is switched to the oscillation circuit 314.324 side.

Fourthly, in the downlink and uplink SL2 to SL8 regions of each TDMA frame of the transmission signal to be output, the frequency changeover switches 313 and 323 are switched to the synthesizer section 315 and 325 side.

By the TDMA/TDD processing unit 306 as described above,
This base station apparatus is controlled by controlling the switching between the frequency changeover switch 313, 323 and the antenna switch 340, and by controlling the setting of the oscillation frequency in the synthesizer section 315, 325 of each of the transmitting unit 310 and the receiving M unit 320 by the communication control section 305. 300, antenna 330
The following transmission and reception operations are performed with respect to the mobile radio line 20 via the mobile radio line 20.

First of all, the TD that has the transmission right of BCCHSCCCH
During the SLl region in the downstream region of the MA frame, the antenna switch 340 is switched to the transmitter 312 side, and the frequency changeover switch 313 on the transmitter 312 side is switched to the fixed frequency oscillation circuit 314 side. ing.

Therefore, during this time, the above TDM of this base station device 300
Of the transmission signals output from A/TDD processing section 306 to modulation section 311, transmission to radio telephone device 400 is performed using control carrier frequencies of BCCH and CCCH.

Of the transmission signals output from the TDMA/TDD processing section 306 to the modulation section 311, the BCCHSCCC allocated to the downlink SLI area of the TDMA frame is
H is a fixed local frequency (control carrier frequency) oscillated from the fixed frequency oscillation circuit 314;
12 through the antenna switch 340, antenna 33o1, and mobile radio line 20, to the radio telephone device 400 within the transmission area of the base station device 300.

Second, TDMA with the transmission right of BCCHSCCCH
Between the regions SL2 to SL8 in the downstream region of the frame, the antenna switch 340 is switched to the transmitting section 312 side, and the frequency changeover switch 313 on the transmitting section 312 side is switched to the synthesizer section 315 side. There is.

Therefore, during this time, the above TDM of this base station device 300
Among the transmission signals output from the A/TDD processing section 306 to the modulation section 311, a communication signal is sent to the radio telephone device 400 using the communication carrier frequency.

Of the transmission signals output from the TDMA/TDD processing section 306 to the modulation section 311, the communication signals assigned to the downlink SL2 to SL8 regions of the TDMA frame are transmitted to the communication control section 305, which are oscillated from the synthesizer section 315. At the local frequency (communication carrier frequency) set by the transmitter 312, the antenna switch 34
01 antenna 3301 and the mobile radio line 20, the wireless telephone device 400 within the transmission area of the base station device 300
Sent to .

Third, TDMA with the transmission right of BCCHSCCCH
In the SLI region in the upstream region of the frame, the antenna switch 340 is switched to the receiving section 321 side, and the frequency changeover switch 323 on the receiving section 321 side is switched to the fixed frequency oscillation circuit 324 ml.
is being given.

Therefore, during this time, among the transmission signals outputted to the base station apparatus 300 from the wireless telephone apparatus 400 within the wireless zone of the base station apparatus 300, the CCCH output using the control carrier frequency is received.

Then, the wireless telephone device 400 is received by the receiving section 321 via the antenna 330 and the antenna switch 340.
Of the transmission signals from the TDMA frame, the uplink SLI
The CCCH allocated to the area is demodulated by a receiving section 321 and a demodulating section 322 using a method such as superheterodyne based on a fixed local frequency (control carrier frequency) oscillated from a fixed frequency oscillation circuit 324. Ru.

Furthermore, the demodulated digital signal is TDMA/TD
It is output to the D processing unit 306 and 1. Here, after being decomposed into CCCH messages, the TDMA/TDD processing section 306 outputs them to the communication control section 305.

Fourth, TDMA with the transmission right of BCCHSCCCH
In the region SF2 to SF3 in the upstream region of the frame, the antenna switch 340 is switched to the receiving section 321 side, and the frequency changeover switch 323 on the receiving section 1321 side is switched to the synthesizer section 315 side.

Therefore, during this period, among the transmission signals output from the wireless telephone device 400 within the wireless zone of the present base station device 300 to the present base station device 300, the communication signal outputted using the communication carrier frequency is received. .

Then, the wireless telephone device 400 is received by the receiving section 321 via the antenna 330 and the antenna switch 340.
Of the transmission signals from the TDMA frame, the upstream SF
The communication signals assigned to the areas SF2 to SF3 are sent to the synthesizer unit 3 in the receiving unit 321 and the demodulating unit 322.
The signal is demodulated based on the local frequency (communication carrier frequency) set by the communication control unit 305, which is oscillated from the communication control unit 305.

Furthermore, the demodulated digital signal is TDMA/TD
TCH buffer memory section 304 via D processing section 306
is output to.

Fifth, TDM that does not have the right to transmit BCCHSCCCH
In the SLI region of the downlink region of the A frame, the antenna switch 340 is switched to the receiving section 321 side, and the frequency changeover switch 323 on the receiving section 321 side is switched to the fixed frequency oscillation circuit 324 side. .

Therefore, during this period, among the transmission signals output from other base station apparatuses 300 within the wireless zone of this base station apparatus 300, the BCCH output using the control carrier frequency is
is received.

Then, another base station device 30 is received by the receiving unit 321 via the antenna 330 and the antenna switch 340.
0 to the wireless telephone device 400, TDM
BCC assigned to the downlink SLI area of A frame
H is demodulated in the receiving section 321 and the demodulating section 322 based on a fixed local frequency (control carrier frequency) oscillated from the fixed frequency oscillation circuit 324.

Furthermore, the demodulated digital signal is TDMA/TD
The data is output to the D processing unit 306 , where it is decomposed into BCCH messages and output to the communication control unit 305 .

Sixth, TDM does not have the right to transmit BCCH and CCCH.
In the region from SF2 to SF3 in the downlink region of the A frame, the antenna switch 340 is switched to the transmitting section 312 side, and the frequency changeover switch 313 on the transmitting section 312 side is switched to the synthesizer section 315 side. .

Therefore, during this time, the above TDM of this base station device 300
Among the transmission signals output from the A/TDD processing section 306 to the modulation section 311, a communication signal is sent to the radio telephone device 400 using the communication carrier frequency.

Of the transmission signals output from the TDMA/TDD processing section 306 to the modulation section 311, the communication signals assigned to the downlink SF2 to SF3 regions of the TDMA frame are transmitted to the communication control section 305, which are oscillated from the synthesizer section 315. At the local frequency (communication carrier frequency) set by the transmitter 312, the antenna switch 34
0, is transmitted via the antenna 3301 and the mobile radio line 20 to the radio telephone device 400 within the transmission area of the base station device 30.

Seventh, TDM does not have the right to transmit BCCH and CCCH.
In the SLI region of the upstream region of the A frame, the antenna switch 34.0 is switched to the receiving section 321 side, and the frequency changeover switch 323 on the receiving section 321 side is switched to the fixed frequency oscillation circuit 324 side. ing.

Therefore, during this time, among the transmission signals output from the wireless telephone device 400 within the wireless zone of the present base station device 300 to other base station devices 300, CCCHO reception is performed using the control carrier frequency. .

And above air 1&! 330, antenna switch 34
The wireless telephone device 4 received by the receiving unit 321 via 0
Of the transmission signals from 00 to other base station devices 300, T
C allocated to the upstream SLl area of the DMA frame
The CCH is demodulated in the receiving section 321 and the demodulating section 322 based on a fixed local frequency (control carrier frequency) oscillated from the fixed frequency oscillation circuit 324.

Furthermore, the demodulated digital signal is TDMA/TD
It is output to the D processing unit 306, where it is decomposed into CCCH messages and output to the communication control unit 305.

Eighth, the LtTD that has the right to transmit BCCHSCCCH
In the SLI area in the upstream area of the MA frame,
The antenna switch 340 is switched to the receiving section 321 side, and the frequency changeover switch 323 on the receiving section 321 side is switched to the synthesizer section 315 side.

Therefore, during this period, among the transmission signals output from the wireless telephone device 400 within the wireless zone of the present base station device 300 to the present base station device 300, the communication signal outputted using the communication carrier frequency is received. .

Then, the wireless telephone device 400 is received by the receiving section 321 via the antenna 330 and the antenna switch 340.
Of the transmission signals from
The communication signals assigned to the areas SL8 to SL8 are transmitted to the synthesizer section 31 in the receiving section 321 and demodulating section 322.
The signal is demodulated based on the local frequency (communication carrier frequency) set by the communication control unit 305, which is oscillated from the communication controller 305.

Then, the demodulated digital signal is converted into TDMA/TD
TCH buffer memory section 304 via D processing section 306
is output to.

This base station device 300 performs the signal transmission/reception operation as described above.
C received from a wireless telephone device 400 within the wireless zone of this base station device 300 to this base station device 300.
CCH, communication signals, and the wireless telephone device 400 and other base station devices 300 within the wireless zone of this base station device Wt300
The BCCH and CCCH transmitted between the two are processed as shown below.

First, in the receiving section 321 of the base station device 300,
Wireless telephone device 40 within the wireless zone of this base station device 300
When the CCCH for this base station device 300 is received from 0, it is demodulated by the demodulation section 322, and further
The DD processing unit 306 decomposes it into CCCH messages and outputs them to the communication control unit 305.

The communication control unit 305 generates a CCCH for connection control to the wireless telephone device 400 of the originator based on the input CCCH message, and sends this CCCH to the transmission unit 310 via the TDMA/TDD processing unit 306. .

Second, in the receiving section 321 of the base station device 300,
Wireless telephone device 40 within the wireless zone of this base station device 300
When a communication signal output from 0 to the present base station device 300 is received, it is demodulated by the demodulation section 322, and further,
The signal is output to the TCH buffer memory section 304 via the TDMA/TDD processing section 306.

The TCH buffer memory unit 304 to which the communication signal is input temporarily stores the communication signal, and demultiplexes the communication signal to the demultiplexer 3 in accordance with the MF cycle in the transmission format on the wired line 10.
Output to 01.

Further, in accordance with the input of the communication signal to the TDMA/TDD processing section 306, the communication control section 305 outputs a control signal for controlling the connection with the line control device 200 to the control signal conversion section 303, and converts the control signal. Section 303 outputs this control signal to demultiplexing section 301.

In this way, the demultiplexer 301 receives the control signal and the communication signal obtained based on the reception of the transmission signal from the wireless telephone device 400, and outputs the control signal according to the transmission format on the wired line 10. C84 of each PR and communication signals are assigned to CHI to CH8 of each PR and sent to the line control device 200 as multiplexed signals.

Thirdly, in the receiving section 321 of the base station device 300,
Wireless telephone device 40 within the wireless zone of this base station device 300
BCCH transmitted between 0 and other base station equipment W300
or CCCH is received, it is demodulated by the demodulator 322,
Furthermore, the TDMA/TDD processing unit 306
It is decomposed into CCH messages and output to the communication control unit 305.

The reception of this BCCH is based on the BCH transmitted from another base station device 300 located within the wireless zone of this base station device 300.
This is for registering and monitoring communication carrier frequencies used by other base station apparatuses 300 located within the wireless zone of this base station apparatus 300 included in CC)I.

On the other hand, the reception of the CCCH is transmitted and received between another base station device 300 located outside the wireless zone of this base station device 300 and the wireless telephone device 400 located within the wireless zone of this base station device 300. This is for registering and monitoring communication carrier frequencies currently used by other base station devices 300 located outside the line zone of this base station device 300, which are included in the CCCH.

Therefore, the communication control unit 305 registers and monitors the communication carrier frequency currently used in other base station devices 300 based on the BCCHSCCCH input from the TDMA/TDD processing unit 306, and Device 3
The frequency of the communication carrier used in the own base station device 300 is changed and set according to the usage status of the communication carrier frequency in 00.

Note that this communication carrier frequency change is performed when there is no access between the base station device 300 to be changed and the Ryu M telephone device 400, and at the same time,
BCC output from this base station device 300 after that
The communication carrier frequency data of H is changed to the new communication carrier frequency data.

2-3. ``The integrated wireless telephone device 400 accesses the nearest base station device 3OO to the line flllJ control device 200 to make calls with the fixed telephone network 1, etc., and communicates with the nearest base station device 300. This system performs TDMA/TDD 8-channel multiplex communication.

Access between this radio telephone device 400 and the nearest base station device 300 is performed based on the transmission and reception of CCCH between them according to the transmission format on the mobile radio line 20 described above.

-(1),” the schematic configuration of the wireless telephone device 400 as described above is
This will be explained based on the diagram. It should be noted that here, "downward direction" indicates signal transmission in the receiving direction of radio telephone device 400, and "up direction" indicates signal transmission in the transmitting direction of radio telephone device 400.

In FIG. 10, 401 is a microphone provided in the transmitter, 402 is a speaker provided in the receiver, and 403 is a microphone provided in the receiver.
4 is an operation section equipped with dial keys, end keys, etc.
Reference numeral 04 denotes a display section on which the operation status etc. by the operation section 403 is displayed, and these constitute a baseband system.

A codec analog/digital converter 405 (hereinafter referred to as a codec A/D converter) receives an audio signal from the microphone 401 in the upstream direction and outputs an audio signal to the speaker 402 in the downstream direction. ), 406 is a buffer memory unit into which a communication signal (audio signal) from the microphone 401 is manually input via the codec A/D converter 405 in the upstream direction.

Reference numeral 407 denotes a communication control unit to which dial signals and the like are input in accordance with the operation of the dial keys of the operation unit 403 in the up direction, and it controls the connection with the nearest base station device 300 based on the calling operation by the operation unit 403. CC is sent to the nearest base station device 300 for connection control.
It generates CH.

408 is a buffer memory unit 40 in the up direction.
6 and the CCCH from the communication control unit 407 are input, and in the downlink direction, the nearest base station device 3 received by the receiving unit 420, which will be described later.
This is a TDMA/TDD processing unit to which the transmission signal from 00 is input.

In the uplink direction, this TDMA/TDD processing unit 408 performs a TDMA/TDD processing unit for transmitting a signal to the nearest base station device 300 based on the communication signal and CCCH input from the buffer memory unit 406 and the communication control unit 407.
Determine the content of the frame.

Then, the determined TDMA frame or this TDMA
Transmission signals to the nearest base station device 300 by SF composed of frames are output in bursts for each TDMA frame with synchronization established by the communication control unit 407.

Furthermore, in the downlink direction, this TDMA/TDD processing section 408 always performs TD
The BCCH from each base station device 300 is received in bursts for each MA frame, and the BCCH from the nearest base station device 300 is received by the receiving unit 420 when a call is made or received at this wireless telephone device 400. The communication control unit 407 communicates with the CCCH requesting incoming connection in the transmission signal of
Then, communication signals among the transmission signals from the nearest base station device 300 are output to the buffer memory section 406, respectively.

In addition, in the down direction, the TDMA/TDD processing section 4
Buffer memory unit 40 into which the communication signal from 08 is input
6 inputs this communication signal, that is, the encoded audio signal, to the codec A/D converter 405, where it is converted into an analog signal and output from the speaker 402.

On the other hand, in the downlink direction, the communication control unit 407 to which the CCCH requesting an incoming connection from the TDMA/TDD processing unit 408 is input, generates a CCCH corresponding to the input CCCH, and converts this CCCH into a TDMA/TDD
It is output to the processing unit 408.

Furthermore, the communication control unit 407 always controls the transmission and reception frequencies of a transmission unit 410 and a reception unit 420 (to be described later) to be fixed to a control carrier frequency, and when making and receiving calls with the wireless telephone device 400, , based on the communication carrier frequency data included in the input CCCH, outputs a signal instructing the transmitting unit) 410 and the receiving unit) 420 to change the transmitting/receiving frequency.

Furthermore, this communication control unit 407 transmits the own wireless telephone device 40 based on the transmission format on the mobile radio line 20 in synchronization with the input timing of the BCCH from the nearest base station device 300, which is received by the receiving unit 420 (described later).
Establish TDMA frame synchronization of 0.

Incidentally, a transmitting unit 410 and a receiving unit 420 for performing wireless transmission and reception with the base station device 300 are connected to the TDMA/TDD processing section 408 . Therefore, the transmitting unit 410 and receiving unit 420 are explained below.
The configuration of this will be explained.

First, in the transmitting unit 410, 411 is a TDM
Connected to the A/TDD processing unit 408, TDMA/TDD
a modulation unit 412 that modulates the transmission signal from the processing unit 408;
is a transmitting unit connected to this modulating unit 411 and transmitting a modulated transmission signal to the nearest base station device 300 via the antenna 430 and mobile radio line 2o.

413 is a synthesizer unit that is connected to this transmitting unit 412 and oscillates a variable frequency;
The transmission signal output from the processing unit 408 in bursts is
This is for switching between a control carrier frequency and a communication carrier frequency for transmission according to the SL of the TDMA frame.

For this reason, the synthesizer section 413 receives a transmission/reception frequency change instruction signal from the communication control section 407, and is normally fixed in accordance with the control carrier frequency under the control of the communication control device 407. During a call, the oscillation frequency that is currently used is changed to match the communication carrier frequency based on the change instruction signal.

On the other hand, in the receiving unit 42o, 421 is a receiving unit that receives input via the mobile radio line 20 and the antenna 430, and 422 is connected to this receiving unit 421, and receives BCCH from each base station device 300, This is a demodulation unit that outputs a digital signal obtained by demodulating a transmission signal from the nearest base station device 300 to the TDMA/TDD processing unit 408.

423 is a synthesizer unit that is connected to the receiving unit 421 and oscillates a variable frequency;
This is for receiving the BCCH from 0 and the transmission signal from the nearest base station device 300 by switching between the control carrier frequency and the communication carrier frequency according to the SL of each TDMA frame. .

For this reason, similar to the synthesizer section 413 described above, this synthesizer section 423 receives a transmission/reception frequency change instruction signal from the communication control section 407 manually.
The oscillation frequency, which is normally fixed in accordance with the control carrier frequency under the control of the communication control unit R407, is changed in accordance with the communication carrier frequency during a call based on the change instruction signal.

The synthesizer sections 413 and 423 are used to change the set frequency as described below.

First, at startup of this wireless telephone system, a change instruction signal indicating that the oscillation frequency is to be set in accordance with the control carrier frequency is input from the communication control section 407, and based on this, each synthesizer section 413, 423 starts the oscillation. Set the frequency to match the control carrier frequency.

Next, in response to a CCCH input related to a connection request from the nearest base station device 300 to the wireless telephone device 400 or a calling operation on the operation unit 403 of the wireless telephone device 400, a signal is generated by the communication control unit 407. When the CCCH is output to the nearest base station device 300, a change instruction signal indicating that the oscillation frequency is to be changed and set according to the communication carrier frequency is input from the communication control unit 407, and based on this, each synthesizer unit 413.423 changes the oscillation frequency to match the communication carrier frequency.

Furthermore, in the case of ff1J, a signal associated with pressing the end key of the operation unit 403 is input to the communication control unit 407, and the end of the call by the wireless telephone device 400 is terminated by the communication control unit 407.
When this is confirmed, a change instruction signal indicating that the oscillation frequency is to be changed and set in accordance with the control carrier frequency is input from the communication control unit 407, and each synthesizer unit 413, 423 controls the oscillation frequency based on this. Change settings according to the carrier frequency used.

In addition, the transmitting section 412 and the receiving section 421, and the antenna 4
An antenna switch 440 is interposed between the transmitter 30 and the antenna switch 440, which switches the connection direction between the transmitter 412 side and the receiver 421 side based on instructions from the TDMA/TDD processor 408.

This antenna switch 440 is always TDMA/T.
DD is switched to the receiving unit 421 side under the control of the D processing unit 408, and when the CCC for a connection request from the nearest base station device 300 is input to the wireless telephone device f400, the wireless telephone device 400 transmission and reception status,
TDM in transmission format on mobile radio link 20
This is for switching in accordance with the SL timing of the A frame.

Note that this antenna switch 440 switches the connection direction as described below in accordance with the SL timing of the TDMA frame.

First, in the entire upstream region of a TDMA frame that has the right to transmit BCCH and CCCH, and the upstream region SL2 to SL8 of a TDMA frame that does not have the right to transmit BCCH and CCCH, the antenna switch is controlled by the TDMA/TDD processing unit 408. 440 is switched to the transmitter 412 side.

On the other hand, in the entire downlink region of a TDMA frame that has the right to transmit BCCH SCCCH, and the uplink SLI region of a TDMA frame that does not have the right to transmit BCCH and CCCH,
Under the control of the TDMA/TDD processing section 408, the antenna switch 440 is switched to the receiving section 421 side.

3-(2), the operation related to signal transmission of the wireless telephone device 400 having the above configuration will be briefly explained.

BCCH is always transmitted from each base station device 300 to the radio telephone device 400 configured as described above, and the radio telephone device 400 normally receives control carrier frequencies under the control of the communication control device 407. Therefore, on this day, the CCH transmits TDMA from the antenna 430 via the antenna switch 440, the receiving section 421, etc.
/TDD processing unit 408.

This TDMA/TDD processing unit 408
The CH is output to the communication control unit 407, and the communication control unit 407 receives the input of this BCCH and sends it to the nearest base station device 30.
TDMA frame synchronization for wireless transmission and reception with 0 is established, and the standby state is entered.

In this state, the radio telephone device 400 performs call processing, and the communication procedure will be explained here.

2 3- (2) a, earth and
Communication with “- (11th 12th base station device 300 using the above BCCH and CCCH)
The procedure for making and receiving calls between the wireless telephone device 400 and the wireless telephone device 400 will be described below.

In the following explanation, the BCCH and CCCH output from the base station device 300 to the radio telephone device 400 are TD
The CCCH is transmitted using a control carrier frequency in the downlink SLI region of the MA frame, and the CCCH output from the wireless device 400 to the base station device 300 is transmitted using the control carrier frequency in the uplink SL1 region of the TDMA frame. .

However, among the CCCHs output from the base station device 300 to the radio telephone device 400, the CCC related to the start instruction described below
Only H is transmitted using a communication carrier frequency in any one of the downlink areas SL2 to SL8 of the TDMA frame.

FIG. 11 shows a communication procedure between the base station device 300 and the radio telephone device 400 when the nearest base station device 300 requests an incoming call to the present radio telephone device 400.

According to this, the base station device 300 always sends out BCCH at the control carrier frequency, and thereby, to the wireless telephone device 400 within the wireless zone of the base station device 300 that sent out the BCCH, The current conditions under which communication is possible on the mobile radio line 20 are reported.

Here, from the nearest base station device 300 to the wireless telephone device 4
When there is an incoming call to 00, the nearest base station device 30
A CCCH (incoming call instruction) with the following content is sent from 0 to this wireless telephone device 400 at the control carrier frequency.

That is, this CCCH (incoming call instruction) includes the number (base station number) of the nearest base station device 300 that is the calling source, the number (mobile station number) of the wireless telephone device 400 that is the destination of the call, and the base station that is currently the calling source. It consists of a communication carrier frequency used by the device 300 and an available communication slot (SL) number at the communication carrier frequency.

On the other hand, the CCCH (
In response to the CCCH (incoming call instruction), the destination radio telephone device 400 that has received the incoming call instruction (incoming call instruction) transmits a CCCH (incoming call response) with the following content on the control carrier frequency.

That is, this CCCH (incoming call response) includes the number of the nearest base station device 300 (base station number) that is the source of the CCCH (incoming call instruction), the number of the own wireless telephone device 400 (mobile station number), It consists of the communication carrier frequency presented by the above CCCH, and the communication slot (SL) number that you wish to use among the available communication slot (SL) numbers presented by the above CCCH. be.

Then, the wireless telephone device 400 that sent the CCCH (call request) changes its own transmission and reception frequency to the communication carrier frequency indicated in the CCCH (call request), and
The desired communication slot (
SL), it waits for a start instruction to arrive from the base station device 300.

In response to the CCCH (incoming call request) received from the radio telephone device 400, the base station device 300 sends out a CCCH (start instruction) with the following content using the communication carrier frequency.

That is, this CCCH (start instruction) includes the number (base station number) of the base station device 300 that is the source of this CCCH (start instruction), the number (mobile station number) of the wireless telephone device 400 that is the destination of the call, and communication carrier frequency, and the communication slot used in the communication carrier frequency) (S
L) It consists of a number.

Through the above procedure, an incoming call is established from the base station device 300 to the wireless telephone device 400, and a call is started.

FIG. 12 shows a communication procedure between the base station device 300 and the radio telephone device 400 when the present radio telephone device 400 requests a call to the nearest base station device 300.

According to this, the base station device 300 always transmits the BCCH at the control carrier frequency, and thereby the Eagle M telephone device 400 within the wireless zone of the base station device 300 that transmitted the BCCH , the contents of the conditions under which communication is possible on the current mobile chain line line and Ij 120 are announced.

Here, from the wireless telephone device 400 to the nearest base station device 3
When making a call to 00, the nearest base station device 30
Based on the BCCH from 0, a CCCH (call request) with the following content is sent from the radio telephone device 400 making the call to the nearest base station device 300 at the control carrier frequency.

That is, this CCCH (call request) includes the number of the nearest base station device 300 (base station 3), the number of its own wireless telephone device 400 (mobile station 4), and the available communication information presented by the above BCCH. Among the slot (SL) numbers, this is the number of the communication slot (SL) that the user desires to use.

Then, the wireless telephone device 400 that sent the CCCH (call request) changes its own transmission and reception frequency to the communication carrier frequency indicated in the CCCH (call request), and
The desired communication slot (
SL), it waits for a start instruction to arrive from the base station device 300.

In response to the CCCH (call request) received from the radio telephone device 400, the base station device 300 transmits a CCCH (start instruction) with the following content using the communication carrier frequency.

That is, this CCCH (start instruction) includes the number (base station number) of the base station device 300 that is the source of this CCCH (start instruction), the number (mobile station number) of the wireless telephone device 400 that is the destination of the call, and A communication carrier frequency, and a communication slot (S) used in the communication carrier frequency.
L) It consists of a number.

Through the above procedure, the wireless telephone device 400 establishes an outgoing connection to the base station device 300, and a call is started.

2-3- (2) b, sending item r2
-3-(2)a, Communication procedure between the base station device and the wireless telephone device'', the base station device 300 and the wireless telephone device 400
Although the content of the data transmitted between the wireless telephone device 400 and the wireless telephone device 400 has been described above, the processing of the transmission signal inside the wireless telephone device 400 will be described here.

When there is an incoming call to this wireless telephone device 400 which is in standby state while receiving BCCH from each base station device 300, the nearest base station device 30 of this wireless telephone device 400
The CCCH transmitted from CCCH 0 is received by the receiving unit 421 via the antenna 430.

The received CCCH is demodulated by the demodulation section 422 , further decomposed into CCCH messages by the TDMA/TDD processing section 408 , and outputted to the communication control section 407 .

The communication control unit 407 transmits a C for connection control to the nearest base station device 300 based on the input CCCH message.
A CCH is generated and sent to the TDMA/TDD processing unit 408.

The TDMA/TDD processing unit 408 to which the CCCH for connection control for the nearest base station device 300 is inputted, at the timing of the uplink SLI area of the TDMA frame in which frame synchronization was established by receiving the BCCH input earlier. The CCCH is output to the modulation section 411 in a burst manner, and the antenna switch 440 is controlled to be switched from the receiving section 421 side to the transmitting section 412 side.

The modulation unit 411 to which the CCCH from the TDMA/TDD processing unit 408 is input modulates this CCCH and transmits it to the transmission unit 4.
12, and the transmitter 412 outputs the modulated CCCH to
The local frequency (
control carrier frequency), the antenna switch 440,
It is transmitted to the nearest base station device 300 via the antenna and mobile radio line 20.

The communication control unit 407 then controls the CC generated here.
When the CH is sent to the nearest base station device 300 as described above, the synthesizer section 413, 423
outputs a change instruction signal to the synthesizer section 413.
．． 423 oscillation frequency from the control carrier frequency,
The nearest base station device 300 shown in the CCCHO above
change to the communication carrier frequency used in
Thereafter, it enters a state of waiting for a CCCH for connection confirmation using a communication carrier frequency from the nearest base station unit [300].

As described above, once the state is in standby for the CCCH for connection confirmation using the communication carrier frequency from the nearest base station device 300, subsequent signal transmission and reception is performed using the downlink and uplink SL2 of the TDMA frame described earlier. This is done in the SL8 area.

Then, the antenna switch 440 is switched between the transmitting section 412 side and the receiving section 421 side according to the timing of each of the downlink and uplink areas SL2 to SL8, and transmission and reception of the call signal is performed.

That is, first, a dial signal input from the operation unit 403 is output from the communication control unit 407 to the TDMA/TDD processing unit 408, and this dial signal is transmitted to the base station device 30 using the selected communication slot (SL) of the TDMA frame.
0 to form a call with the dialed telephone.

When a call is established with the dialed telephone, the main line telephone device 400 encodes the audio signal input from the microphone 401 in the codec A/D converter 405, and converts the audio signal into the selected communication slot. (SL) by T
The DMA/TDD processing unit 408 outputs the communication signal from the base station device 300 in bursts to the base station device 300, and the codec A/D transmits the communication signal from the base station device 300, that is, the encoded audio signal.
The converter 405 performs analog conversion and outputs the signal from the speaker 402.

In this way, a call is made between the wireless telephone device 400 and another telephone, and when the call ends, the communication control unit 407 recognizes this by pressing the end key on the operation unit 403, etc., and controls the transmitting unit 410 and the receiving unit. A change instruction signal indicating that the oscillation frequency is to be changed and set according to the control carrier frequency is output to each synthesizer section 413 and 423 of 420, and based on this, each synthesizer section 4
13.423 changes and sets the oscillation frequency in accordance with the control carrier frequency.

Further, the communication control section 40/7 outputs a signal indicating that the call has ended to the TDMA/TDD processing section 408, and accordingly, the TDMA/TDD processing section 408 moves the antenna switch 440 to the receiving section 421 side. control to switch to .

As a result, the steaming telephone device 400 returns to the initial standby state and starts receiving BCCH from the nearest base station device 300.

On the other hand, when a call operation is performed using the operation unit 403 in the wireless telephone device 400 which is in the standby state, a signal indicating this is input to the communication processing unit 407.

Communication control unit 407 generates a CCCH for a connection request to the nearest base station device 300 based on the input signal, and sends this CCCH to TDMA/TDD processing unit 408 .

The TDMA/TDD processing unit 408 to which the CCCH for connection request to the nearest base station device 300 is inputted, at the timing of the uplink SLI area of the TDMA frame in which frame synchronization was established by receiving the input of the BCCH earlier. The CCCH is output to the modulation section 411 in a burst manner, and the antenna switch 440 is controlled to be switched from the receiving section 421 side to the transmitting section 412 side.

The modulation unit 411 to which the CCCH from the TDMA/TDD processing unit 408 is input modulates this CCCH and transmits it to the transmission unit 4.
12, and the transmitter 412 outputs the modulated CCCH to
The local frequency (
control carrier frequency), the antenna switch 440,
Aerials, and mobile radio ports &! j! 20 to the nearest base station device 300.

The communication control unit 407 then controls the CC generated here.
When the CH is sent to the nearest base station device 300 as described above, the synthesizer section 413, 423
outputs a change instruction signal to the synthesizer section 413.
．． 423 oscillation frequency from the control carrier frequency,
The nearest base station device 300 shown in the CCCHO above
change to the communication carrier frequency used in
Thereafter, it enters a state in which it waits for a CCCH for connection confirmation using a communication carrier frequency from the nearest base station device 300.

As described above, once the state is in standby for the CCCH for connection confirmation using the communication carrier frequency from the nearest base station device 300, subsequent signal transmission and reception is performed using the downlink and uplink SL2 of the TDMA frame described earlier. This is carried out in the area of SL8, and the same processing as described in the previous section "2 3 (21b-t, transmission signal processing J for incoming call requests from the base station apparatus side)" is performed.

Then, with the end of the call, the wireless telephone device 400 returns to the initial standby state and starts receiving the BCCH from the nearest base station device 300.

3. Communication Monitoring and Avoidance As described above, each wireless telephone device 400 accesses the nearest base station device 300 and executes a call with the fixed telephone network 1, etc. However, the number of communication carrier frequencies selected by each base station device 300 is predetermined, and each base station device 300 arbitrarily selects its own communication carrier frequency from among the carrier frequencies at the startup of this wireless telephone system. Select carrier frequency.

By the way, in each base station device 300, the r
As explained in 2-2-(2) c, transmission signal processing in the upstream (wireless telephone device transmission/base station device reception) direction,
BCCHSCCCH (7) Other base station units in the downlink and uplink SLI areas of the IE DMA frame that do not have the right to transmit! BCCH transmitted from 300 and wireless telephone device 40
Reception with CCCH transmitted from 0 is performed.

Then, each base station device 300 receives the received BCCH, CC
Based on the content of the CH, the communication carrier frequency used by other base station devices 300 is monitored, and the communication carrier frequency of the own base station device 300 is determined by the other base station device 3.
If the communication carrier frequency matches the communication carrier frequency used in 00, the communication carrier frequency of the own base station device 300 is changed to avoid interference.

As mentioned above, each base station device 300
Each downlink and uplink S of a TDMA frame that does not have the right to transmit a CH
In the LI area, BC sent from another base station device 300 located within the wireless zone of the own base station device 300
It constantly receives CH and inputs the received BCCH to the communication control unit 305.

In addition, each base station device 300 receives signals from its own base from the wireless telephone device 40.0 located within the radio zone of its own base station device 300 in the downlink and uplink SLI regions of TDMA frames that do not have the right to transmit BCCH and CCCH. The station device 300 constantly receives the CCCH transmitted to other base station devices 300 located outside the wireless zone, and inputs the received cccH into the communication control unit 305 in the same way as the BCCH described above. There is.

FIG. 13 is an explanatory diagram showing the relationship between the arrangement of each base station device 300 and the wireless zone of each base station device 300.

In addition, FIG. 14 shows each base station device 3 shown in FIG. 13.
FIG. 2 is an explanatory diagram showing the contents of BCCH and CCCH monitoring that can be performed in 00.

In addition, in FIG. 13, in order to distinguish each base station apparatus 300, each base station apparatus 300 is referred to as a base station apparatus 30.
0 to j base station devices 300.

In FIGS. 13 and 14, A indicates the wireless zone of the a base station device 300, B indicates the wireless zone of the b base station device 300, and similarly, C to J respectively indicate the C base station device 300. 3 is a chart showing wireless zones of devices 300 to j base station devices 300. FIG.

In addition, the black (・) in FIG. 14 indicates the correspondence between each wireless zone A to J and each base station device 300.
Indicates combinations that can be monitored, with white circles (○
) indicates combinations in which CCCH monitoring is possible in correspondence between each communication line zone A to J and each base station apparatus 300.

Taking the a base station unit ft300 in FIG. 13 as an example, in the wireless zone A of this a base station device 300,
There are base station apparatuses b 300 to g base station apparatuses 300, and therefore, the BCCH transmitted from these base station apparatuses b 300 to 9 base station apparatuses 300 can be received by the a base station apparatus 300. be.

Therefore, the a base station device 300 receives the BCCH output from the b base station device 300 to the g base station device 300 in the region of each downlink SLI of the TDMA frame in which there is no transmission right for BCCH and CCCH, and the communication control unit 305.

On the other hand, the h base station devices 300 to j base station devices 300 are located outside the wireless zone of the a base station device 300, and therefore the h base station devices 300 to j base station devices 300 The a base station device 300 cannot receive the transmitted BCCH.

However, for these base station devices h to j base station devices 300, regarding the CCCH output from the wireless telephone device 400 located in the wireless zone A of the a base station device 300, the a base station device 300 is possible.

Therefore, in the area of each uplink SLI of a TDMA frame that does not have the right to transmit BCCH and CCCH, the a base station device 300 is configured to The station devices 300 to j receive CCCHs output to the base station devices 300 and transmit them to the communication control unit 305.

In this way, the BCCH output from the b base station devices 300 to the 9 base station devices 300 and the wireless telephone device 400
The communication control unit 305 to which the CCCHs output to the h base station apparatuses 300 to j base station apparatuses 300 are inputted, controls the b base station apparatus 3 indicated by these BCCH SCCCHs.
00 to j Recognize the communication carrier frequency used in the base station device 300, and identify the communication carrier frequency used in the a base station device 300 and the other b base station devices 300.
to j It is detected whether or not there is a match with the communication carrier frequency used by the base station device 300.

Then, each a base station device 300 to j base station device 300
However, each of the base station devices A to J base station devices 300 monitors the BCCH and CCCH of the other base station devices 300 to 300 as described above, and detects overlapping use of the same communication carrier frequency.

Through the above BCCH monitoring and CCCH monitoring, when the communication processing unit 305 of the a base station device 300 detects coincidence of communication carrier frequencies between the a base station device 300 and the other b base station devices 3QO to j base station devices 300. , the first stage r2-
2-c, Transmission signal processing in the upstream (wireless telephone device transmission/base station device reception) direction”, a base station device 3
The communication carrier frequency is controlled to be changed when all of the communication throwers (SL) of 00 are not used.

By the way, if the number of carrier frequencies for communication that can be used in this wireless telephone system is large compared to the density of each base station apparatus 300, the optimum frequency allocation can be realized by the control of the communication control unit 305 as described above.

However, if each of the base station devices a to j base station devices 300 is arranged densely and the number of communication carrier frequencies allocated to the entire radio telephone system is small compared to the density, The following situations may occur:

For example, taking the a base station device 300 as an example, the communication carrier frequency used by the a base station device 300 and the other b
When it is confirmed that the communication carrier frequencies used by the base station devices 300 to j base station devices 300 match, the communication carrier frequencies assigned to the main chain line telephone system are all used by the other base station devices b. 300 to j base station devices 300 may be in use.

Therefore, in such a case, the following interference avoidance processing is performed.

First, for example, when the communication control unit 305 of the a base station device 300 detects that surrounding BCCH monitoring is possible and all communication carrier frequencies are being used by the base station devices 300 to 9 base station devices 300. In this case, the communication control unit 305 sets the communication carrier frequency of the a base station device 300 to the base station device with the lowest reception level among the BCCHs transmitted from the surrounding base station devices b to g base station devices 300. The communication carrier frequency is controlled to be changed to the communication carrier frequency used by 300.

Note that if the communication carrier frequency used by the surrounding base station apparatus 300 with the lowest BCCH reception level is already used by other base station apparatuses b to j base station apparatuses 300, , the communication control unit 305 adds the communication carrier frequency of the a base station device 300 to the communication carrier frequency used by the neighboring base station devices 300 to 9 base station devices 300 having the next lowest BCCH reception level. control to change.

And, even with such avoidance processing, the BCC of the surrounding area
H monitoring is possible from base station device 300 to g base station device 3
If there is an overlap with 00, the same avoidance process as above will be repeated thereafter.

On the other hand, the communication control unit 305 of the a base station device 300 is able to monitor the surrounding BCCHs and receives the BCCHs from the base station devices 300 to 9 base station devices 300, and the h base station devices 300 to 300 which cannot receive BCCHs. When it is detected by monitoring the CCCH from the wireless telephone device 400 to the j base station device 300 that all communication carrier frequencies are being used by the other b base station devices 300 to j base station devices 300. In this case, the communication control unit 305 of the a base station device 300 performs the following processing.

That is, the communication control unit 305 of the a base station device 300,
Each base station device 300 to j that cannot receive BCCH
C from wireless telephone device 400 to base station device 300
When a CCH is received, each base station device 300 to j base station device 300 checks the CCCH reception frequency, and selects the base station device 300 to h base station device g that has the least CCCH reception frequency.
The communication carrier frequency of the a base station device 300 is controlled to be changed to the communication carrier frequency used by the base station device 300.

With such interference avoidance processing, even in a radio telephone system in which base station devices a to j are arranged densely, interference avoidance processing can be performed at the communication carrier frequency without performing station placement design.

Although the explanation has been given by taking the base station device 300 as an example, the above-mentioned monitoring of BCCH and CCCH, detection of overlapping use of the same communication carrier frequency, and interference avoidance processing are performed by other base station devices 300 and 300.
The same process is performed in the base station devices 300 to j base station devices 300.

Effects of the Invention As described above, according to the present invention, communication between a plurality of base stations connected via wired lines to a center station connected to a fixed telephone network and mobile stations receiving services from these base stations is achieved. A communication carrier that allows each base station to select a frequency from among a plurality of frequencies for communication using a mobile radio line;
A multi-carrier time division multiplex/time division duplex communication method is used to transmit control signals using a control carrier whose frequency is common among these base stations. , a broadcast signal containing communication carrier current frequency information, which is frequency information of the communication carrier currently in use at that base station, is transmitted intermittently on a control carrier, and each base station The system receives broadcast signals sent from other base stations and recognizes the current communication carrier frequency of that base station, and each base station checks the current communication carrier frequency of its own base station and the communication of other base stations. Compare and contrast the carrier current frequency for
Based on the comparison results, the communication carrier frequency of the own base station is reselected.

Further, the present invention recognizes the current frequency of the communication carrier of another base station by receiving a call control signal including communication carrier current frequency information of the other base station, which is sent from a mobile station to another base station. I decided to do so.

Therefore, it monitors the communication carrier frequencies used by other base stations, detects whether or not the communication carrier frequencies of the own base station and other base stations match, and determines whether the communication carrier frequencies of other base stations match. When a match is detected, the carrier frequency for communication of the own base station is reselected, thereby making it possible to change the carrier frequency for communication of the own base station and prevent interference with other base stations, By selecting the communication carrier frequency of your own base station in advance to prevent interference with other base stations, you can shorten the time required to access a mobile station, making it easier to design station locations and communicate. There is no need for frequency planning for carriers, and existing FDM
The TDMA method can be easily introduced into the A-type cordless telephone system.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the overall configuration of a wireless telephone system using a communication carrier frequency dynamic allocation method according to an embodiment of the present invention; FIG. 2 is an explanatory diagram showing a transmission format on a wired line; FIG. 3 is an explanatory diagram showing a TDMA frame used in a transmission format of a general 8-channel TDMA/TDD system, and FIG. 4 is an explanatory diagram showing a transmission format on a mobile radio line regarding each base station device. FIG. 5 is an explanatory diagram showing the temporal relationship of transmission formats on the mobile radio line of each base station device, FIG. 6 is an explanatory diagram showing the transmission format in the control slot of a TDMA frame, and FIG. An explanatory diagram showing a transmission format in a communication slot of a TDMA frame, FIG. 8 is a block diagram showing a schematic configuration of a line control device, FIG. 9 is a block diagram showing a schematic configuration of a base station device, and FIG. 10 is a block diagram showing a schematic configuration of a base station device. FIG. 11 is an explanatory diagram showing a schematic configuration of a radio telephone device; FIG. 11 is an explanatory diagram showing a communication procedure between the base station device and the radio telephone device when a call is received from the base station device to the radio telephone device; FIG. 13 is an explanatory diagram showing the communication procedure between the base station device and the radio telephone device when a call is received from the radio telephone device to the base station device. Fig. 13 shows the arrangement of each base station device and the FIG. 14, an explanatory diagram showing the relationship with the wireless zone, is an explanatory diagram showing the details of BCCH and CCCH monitoring that can be performed by each base station device. l... Fixed telephone network, 2... Center station, 3... Base station, 4... Mobile station, 10... Wired line, 20...
Mobile radio line, 310... Transmission unit, 324...
- Fixed frequency oscillation circuit, 325... synthesizer section. Name of agent Patent attorney Shige Awano Takahaka 1 person Nfu N Aji Figure 8 Figure 9 Figure 11 Figure 14

Claims (10)

[Claims] (1) Communication via mobile radio lines between multiple base stations connected via wired lines to a center station connected to a fixed telephone network and mobile stations receiving services from these base stations.
A communication carrier that allows each base station to select a frequency from among multiple frequencies, and a control carrier that has a common frequency among those base stations for transmitting control signals. , a multi-carrier time division multiplex/time division duplex communication system is used, and each base station sends a broadcast signal containing communication carrier current frequency information, which is frequency information of the communication carrier currently in use at its own base station. is transmitted intermittently on a control carrier, and each base station receives broadcast signals sent from other base stations to recognize the current frequency of that base station's communication carrier. , Each base station compares and contrasts the current communication carrier frequency of its own base station with the communication carrier current frequency of other base stations,
A communication carrier frequency dynamic allocation method that reselects a communication carrier frequency of its own base station based on the comparison result. (2) Each of the above base stations receives a call control signal containing the current frequency information of the communication carrier of another base station sent from the mobile station to the other base station, and receives the communication carrier of the other base station. 2. The communication carrier frequency dynamic allocation method according to claim 1, wherein the current frequency is recognized. (3) Claim (2) wherein the transmission timings of the transmission and reception control signals are made different so that the transmission and reception control signals transmitted from the plurality of mobile stations do not overlap in time with each other. The described communication carrier frequency dynamic allocation method. (4) Claim (1) wherein the broadcast signals transmitted from the plurality of base stations are transmitted at different timings so that the broadcast signals do not overlap with each other in time.
) to (3), the communication carrier frequency dynamic allocation method described in (3) above. (5) Claim in which the base station transmits broadcast signals and call origination/reception control signals using a transmission unit for a control carrier frequency, and transmits communication signals using a transmission unit for a communication carrier frequency. The communication carrier frequency dynamic allocation method described in (1) to (4). (6) The above-mentioned base station transmits the broadcast signal and the outgoing/receiving control signal by using a synthesizer circuit or a crystal oscillator as the fixed frequency oscillation circuit for the control carrier frequency, and a synthesizer circuit as the oscillation circuit for the communication carrier frequency. Claims (1) to (4) wherein the transmission is performed by one transmitting unit.
The described communication carrier frequency dynamic allocation method. (7) The base station confirms that the communication carrier frequency of its own base station matches the communication carrier frequency of the other base station by receiving a broadcast signal sent from another base station, and 7. The communication carrier frequency dynamic allocation method according to claim 1, wherein a communication carrier frequency that is not used by another base station is reselected when it is confirmed that there is a vacant frequency. (8) The base station confirms that the communication carrier frequency of its own base station matches the communication carrier frequency of the other base station by receiving a broadcast signal sent from another base station, and When it is confirmed that there is no vacant frequency, the base station is being used by another base station that is sending out the broadcast signal with the lowest reception level, and the other base station is also transmitting the broadcast signal with the lowest reception level. 7. The communication carrier frequency dynamic allocation method according to claim 1, wherein a communication carrier frequency used only by a base station is reselected. (9) The base station confirms that the communication carrier frequency of its own base station matches the communication carrier frequency of the other base station by receiving the call control signal sent from the mobile station to the other base station. , and when it is confirmed that a plurality of communication carrier frequencies are vacant, a communication carrier frequency that is not used by another base station is reselected.
1) The communication carrier frequency dynamic allocation method described in (6). (10) The base station confirms that the communication carrier frequency of its own base station matches the communication carrier frequency of the other base station by receiving the call control signal sent from the mobile station to the other base station. , and when it is confirmed that there are vacancies in multiple communication carrier frequencies, the communication carrier frequency used by another base station to which the outgoing/receiving control signal that is received least frequently is sent is reselected. The communication carrier frequency dynamic allocation method according to claims (1) to (6).