JPH09298506A - Radio base station equipment and synchronization method between radio base stations - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a slave radio base station from being stopped even when a master radio base station is faulty by generating a TDMA frame synchronizing signal of the slave radio base station in the same turning as that of the master radio base station and storing it. SOLUTION: A timing control section 15(25) consisting of a TDMA synchronizing signal generating section 151(152), a TDMA frame synchronizing signal window section 152(252) and a selector section 153(253) is provided for the master (slave) radio base station 10(20), a generating timing of a TDMA synchronizing signal in the master radio base station and the slave radio base station is made the same, the TDMA frame synchronizing signal window section is provided with a TDMA frame synchronization storage means to output the TDMA frame synchronizing signal keeping the preceding timing from the TDMA frame synchronizing signal window section of the slave radio base station even when the master radio base station is in system-down.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital radio communication device, and more particularly, to a radio base station for communicating in a TDMA (time division multiple access) system provided with a radio base station inter-synchronization device for synchronizing radio base stations. Regarding

[0002]

2. Description of the Related Art Conventionally, in this type of radio base station,
In order to improve the utilization efficiency of wireless channels, a synchronization function is provided for frame synchronization between wireless base stations. A conventional wireless base station having such a wireless base station synchronizer is shown in FIG.
The one described in Japanese Patent No. 7558 is known.
FIG. 5 is a block diagram showing a configuration of a master radio base station and a slave radio base station including a synchronization device for synchronizing conventional radio base stations.

First, the configurations of a master radio base station and a slave radio base station having a conventional inter-radio base station synchronizer will be described with reference to FIG. In FIG. 5, 10A
Is a master radio base station that outputs a TDMA frame synchronization signal to a slave radio base station, 11A is a line interface unit that extracts a frame synchronization signal from a signal of a digital public line (ISDN network), and 12A is a radio frame timing control and TDMA. A TDMA control unit that controls the timing of the / TDD frame, 13A is a wireless signal modulation unit that modulates a wireless signal at the control timing from the TDMA control unit 12A, and 14A is a wireless transmission unit that wirelessly transmits to a wireless mobile station.

Further, 15A is a line interface section 1
A variable frequency oscillating unit that supplies a clock signal matching the network synchronization signal extracted in 1A to the TDMA control unit 12A, 1
6A is a timing generation unit that generates a TDMA frame synchronization signal that serves as a reference for wireless transmission / reception timing from the frame synchronization signal, and 17 is 1 TDMA frame synchronization signal.
A delay unit that outputs a radio frame transmission timing signal that is cyclically delayed.

Next, the TDMA frame synchronization signal output from the master radio base station 10A is transmitted to the slave radio base station 1
In the slave radio base station 10B, which receives the TDMA frame synchronization signal delayed in transmission until it is input to 0B, and synchronizes accordingly, 11B is a digital public line (I
A line interface unit that extracts the same frame synchronization signal as the frame synchronization signal from the SDN network signal, 1
Reference numeral 8 denotes a radio frame transmission timing signal generator that outputs a radio frame transmission timing signal by synchronizing the frame synchronization signal with the TDMA frame synchronization signal.
The TDMA control unit 12B, the radio signal modulation unit 13B, the radio transmission unit 14B, and the variable frequency oscillation unit 15B are the TDMA control unit 12A, the radio signal modulation unit 13A, the radio transmission unit 14A, and the variable frequency oscillation unit of the master radio base station 10A. 15A
Is the same as

Next, with reference to FIG. 5, the operation of the conventional inter-radio-base-station synchronizer comprising a master radio base station and a slave radio base station will be described. Master radio base station 10
The line interface unit 11A of A extracts the network synchronization signal from the signal of the digital public line (ISDN network) and sends it to the variable frequency oscillating unit 15A for timing control, and also extracts the frame synchronization signal to the timing generation unit 16A. Output. The timing generation unit 16A uses the frame synchronization signal as a reference for wireless transmission / reception timing T
A DMA frame synchronization signal is generated and sent to the delay unit 17 and the radio frame transmission timing signal generation unit 18 of the slave radio base station 10B. The delay unit 17 delays the input TDMA frame synchronization signal by one digital frame to synchronize with the TDMA frame synchronization signal which is transmitted to the slave radio base station 10B and delayed in transmission, and the radio transmission unit 14
Send to A.

On the other hand, in the slave radio base station 10B, the line interface unit 11B extracts the same frame synchronization signal as the frame synchronization signal from the signal of the digital public line (ISDN network) and sends it to the radio frame transmission timing signal generation unit 18. Output. The radio frame transmission timing signal generation unit 18 synchronizes the frame synchronization signal with the TDMA frame synchronization signal from the master radio base station 10A and outputs the radio frame transmission timing signal to the radio transmission unit 14B. In this way, the radio signal from the master radio base station 10A and the slave radio base station 1
The wireless mobile station receives the wireless signal from OB in synchronization.

That is, since the TDMA frame synchronization signal output from the master radio base station 10A is necessarily delayed in transmission due to a cable or the like, the slave radio base station 1
The TDMA frame synchronization signal input to 0B is delayed by the transmission delay thereof and the radio frame transmission timing signal generation unit 1
8 is input. Therefore, the line interface unit 1
The frame synchronization signal input from 1B and the transmission delay T
A radio frame transmission timing signal is generated and output by the DMA frame synchronization signal. Since the timing of this radio frame transmission timing signal matches the timing of the delayed radio frame transmission timing signal from the delay unit 17 of the master radio base station 10A, synchronization of radio signals transmitted from both the master and slave radio base stations 10A and 10B. Will be established.

[0009]

However, in the above-described conventional inter-radio base station synchronizer, when the master radio base station is out of synchronization due to a failure or the like, a synchronization signal is received from the master radio base station. There is a problem that all the slave wireless base stations that are present cannot perform wireless transmission. In that case, even if one of the slave radio base stations is switched to the master radio base station, the TDs of the master radio base station and the slave radio base station are different from each other.
Since the MA frame sync signal is out of sync with one digital frame, there is a problem to be solved that the transmission timing of the radio signal has to be changed and the entire radio transmission is temporarily stopped.

The present invention has been made in order to solve the above-mentioned conventional problems, and T generated from a slave radio base station.
The DMA frame synchronization signal is transmitted to the TDMA of the master radio base station.
Even if the master radio base station fails, the slave radio base station is prevented from stopping even if it is generated and held at the same timing as the frame synchronization signal, and the slave radio base station is set to the master radio while continuing wireless transmission. An object of the present invention is to provide a radio base station adapted to be used by switching to a base station and a synchronization method between the radio base stations.

[0011]

A radio base station apparatus and a synchronization method between radio base stations according to the present invention include a TDMA sync signal generation section, a TDMA frame sync signal window section, and a selector section in each master and slave radio base station. By providing a timing control unit consisting of TDMA frame synchronization signal generation timing in the master radio base station and each slave radio base station at the same time, and by providing TDMA frame synchronization holding means in the TDMA frame synchronization signal window unit, Even if the slave radio base station that functions as the base station or the master radio base station goes down, the generation timing of the TDMA frame synchronization signal generated by the slave radio base station is continuously generated at the same timing as the previous timing. is there.

According to the present invention, the frame synchronization of the radio channels between all the radio base stations is established, and even if the master radio base station goes down, the radio transmission between the radio base stations is stopped without stopping the radio transmission. A wireless base station device and a method of synchronizing between wireless base stations capable of maintaining frame synchronization of channels are obtained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises a frame synchronization signal generating means for extracting a frame synchronization signal from a digital public line, and a transmission timing of a radio channel from the extracted frame synchronization signal. A master radio base station having a timing control unit for generating a TDMA frame synchronization signal to be determined, means for wirelessly transmitting to a mobile station, frame synchronization signal generation means for extracting the frame synchronization signal from a digital public line, and The slave radio base station includes a timing control unit that generates a TDMA frame synchronization signal that determines the transmission timing of the radio channel from the extracted frame synchronization signal, and a slave radio base station that includes means for performing radio transmission to the mobile station. The timing controller that generates the TDMA frame synchronization signal of the base station is TDM sent from the radio base station
The TDM having the same timing as the TDMA frame synchronization signal from the master radio base station upon receiving the A frame synchronization signal
The present invention includes a TDMA frame synchronization signal generation means for generating an A frame synchronization signal, and improves the utilization efficiency of the wireless channel by establishing frame synchronization of the wireless channel between all the wireless base stations. Have.

According to a second aspect of the present invention, the frame synchronization signal generating means for extracting the frame synchronization signal from the digital public line and the TDMA for determining the transmission timing of the radio channel from the extracted frame synchronization signal.
A master radio base station provided with a timing control unit for generating a frame synchronization signal, a unit for wirelessly transmitting to a mobile station, a frame synchronization signal generation unit for extracting the frame synchronization signal from a digital public line, and the extracted The slave radio base station comprises a timing control unit that generates a TDMA frame synchronization signal that determines the transmission timing of a radio channel from the frame synchronization signal, and a slave radio base station that includes means for performing radio transmission to a mobile station. T
The timing control unit for generating the DMA frame synchronization signal receives the TDMA frame synchronization signal transmitted from the master radio base station, and receives the TDMA from the master radio base station.
A TDMA frame synchronization signal generating means for generating a TDMA frame synchronization signal at the same timing as the frame synchronization signal and a means for holding the generated TDMA frame synchronization are included, and all the radio base stations are connected. Using the wireless channel by establishing the frame synchronization of the wireless channel and maintaining the wireless channel frame synchronization between the wireless base stations without stopping the wireless transmission even if the master wireless base station goes down. It has the effect of improving efficiency.

According to a third aspect of the present invention, the master radio base station and a plurality of slave radio base stations are continuously connected through a connection line for transmitting a TDMA frame synchronization signal with the master radio base station as a base point. And the TDMA
The means for holding the frame synchronization outputs the signal indicating the held TDMA frame synchronization at each frame-synchronized frame timing and uses it for wireless transmission, and sends it to the slave wireless base station to be connected next to the master. TDMA frame synchronization signals of all wireless base stations and slave wireless base stations are transmitted at the same timing, and frame synchronization of wireless channels between all connected wireless base stations is established. It has the effect that

According to a fourth aspect of the present invention, in the master radio base station and the slave radio base station, the T
A timing control unit for generating a DMA frame synchronization signal includes TDMA synchronization signal generation means for generating a TDMA frame synchronization signal from the extracted frame synchronization signal, and a TDMA frame synchronization signal based on the TDMA frame synchronization signal received from the master radio base station. For generating the TDMA frame synchronization signal, and the TDMA frame synchronization signal from the TDMA synchronization signal generation means or the TD.
And a selector unit for selecting and outputting any one of the TDMA frame synchronization signals from the MA frame synchronization signal generation unit, wherein the selector unit is a master radio base station, the TDMA frame synchronization signal from the TDMA synchronization signal generation unit. In the slave radio base station, the TDMA frame sync signal from the TDMA frame sync signal generating means is selected to establish frame synchronization of radio channels among all the radio base stations. , Even if the master radio base station goes down,
Since the frame synchronization of the wireless channels between the wireless base stations can be maintained without stopping the wireless transmission, there is an effect of improving the utilization efficiency of the wireless channels.

According to a fifth aspect of the present invention, in the master radio base station and the slave radio base station, a frame synchronization signal is extracted from a digital public line, and a transmission timing of a radio channel is extracted from the extracted frame synchronization signal. Generating a TDMA frame synchronization signal and wirelessly transmitting to the mobile station using the generated TDMA frame synchronization signal. The step of generating the TDMA frame synchronization signal in the slave radio base station includes: The TDMA frame synchronization signal transmitted from the master radio base station is received, the TDMA frame synchronization signal is generated at the same timing as the TDMA frame synchronization signal from the master radio base station, and the generated TDMA frame synchronization signal is held. , Outputting the held TDMA frame synchronization signal and wirelessly transmitting it. And the steps used for frame synchronization of other slave radio base stations are included, and when the radio radio frame synchronization between all the radio base stations is established and the master radio base station goes down. However, it is possible to maintain the frame synchronization of the wireless channels between the wireless base stations without stopping the wireless transmission, which has the effect of improving the utilization efficiency of the wireless channels.

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings and FIGS. 1 to 4. FIG. 1 is a block diagram showing the configuration of a radio base station including a radio inter-station synchronization device according to an embodiment of the present invention, and FIG. 2 is a master radio base station and a slave configured based on the radio base station shown in FIG. FIG. 3 is a block diagram showing the configuration of a radio base station, FIG. 3 is a timing diagram for explaining the operation of the TDMA frame synchronization signal window unit shown in FIG. 1, and FIG. 4 is a master radio base station and a slave in one embodiment of the present invention. It is a block diagram of a digital wireless communication system showing the connection of the wireless base station.

First, the configuration of a radio base station provided with the inter-radio base station synchronizer according to the present embodiment will be described with reference to FIG. In FIG. 1, reference numeral 1 is a radio base station main body,
Reference numeral 11 denotes a line interface unit (constituting frame synchronization signal generating means) for connecting to a digital public line (ISDN network) and extracting a frame synchronization signal A from the signal.
Reference numeral 12 performs error detection encoding, simple confidential processing, scramble processing, etc. for the transmission wireless channel, and performs error detection, UW (unique word) detection, channel type determination, etc. for the reception wireless channel. TDMA control unit, 13 is a wireless control unit for controlling the wireless transmission unit 14, 1
Reference numeral 4 denotes a wireless transmission unit that transmits a wireless channel to the wireless mobile station.

Reference numeral 15 is a timing control unit for performing TDMA frame synchronization, which is a TDMA synchronization signal generation unit 1.
51, a TDMA frame synchronization signal window unit 152, and a selector unit 153. The TDMA sync signal generator 151 is used when the radio base station operates as a master radio base station (10 in FIG. 2) and is used for TDM based on the frame sync signal A from the line interface unit 11.
The A frame synchronization signal B is generated and output. Also, TD
The MA synchronization signal generation unit 151 holds, for example, the frame synchronization established when the power is turned on and uses it for the subsequent frame synchronization, for example, a frame synchronization including a counter or the like (may be other means such as delay means). It has a holding means.

The TDMA frame synchronization signal window unit 152 constitutes TDMA frame synchronization signal generation means in the slave radio base station and is used when the radio base station operates as a slave radio base station (20 in FIG. 2). TDMA indicating the frame synchronization based on the TDMA frame synchronization signal E received from the master radio base station 10.
The frame synchronization signal D is created. Further, the TDMA frame synchronization signal window unit 152 includes, for example, means for holding frame synchronization such as a counter, and even if the TDMA frame synchronization signal E is not input due to a failure of the master radio base station 10 or the like. The TDMA frame synchronization signal D1 is output as a signal for maintaining the frame synchronization held in the.

Therefore, when the radio base station operates as the master radio base station 10, the selector unit 153 performs TDM.
A frame synchronization signal B is selected and the slave radio base station 2
When operating as 0, TDMA frame synchronization signal D1
To transmit the TDMA frame synchronization signal C or C1 to the wireless transmission unit 14 and the other slave wireless base station 20.

The radio base station according to the present embodiment shown in FIG. 1 can be used as both a master radio base station and a slave radio base station, and therefore has the same configuration. That is, in FIG. 2, since the master radio base station 10 does not receive the TDMA frame synchronization signal E, the master radio base station 10 is the same as the master radio base station 1 of FIG. Part 2
1, TDMA control unit 22, radio control unit 23, radio transmission unit 24, timing control unit 25, TDMA synchronization signal generation unit 251, TDMA frame synchronization signal window unit 25
2, selector 253, frame synchronization signal A1 and TD
MA synchronization signal B1, the master radio base station main body 10 in the master radio base station 10, and the line interface unit 1
1, TDMA control unit 12, wireless control unit 13, wireless transmission unit 14, timing control unit 15, TDMA synchronization signal generation unit 151, TDMA frame synchronization signal window unit 15
2, selector 153, frame synchronization signal A1 and TD
It is the same as the MA sync signal B1 (TDMA frame sync signals E, C1, D1 will be described later). Therefore,
The radio base station according to the present embodiment can be freely connected to and changed from the master radio base station to the slave radio base station.

However, when the radio base station 1 shown in FIG. 1 is used as the master radio base station 10, the TDMA frame synchronization signal E is not received as will be shown in FIG. Window part 15
2 is not used and only the TDMA frame synchronization signal B is used, and when used as the slave radio base station 20, the TDMA frame synchronization signal E is received as shown in FIG.
, The selector unit 253 preferentially uses the TDMA frame synchronization signal D1.

Next, with reference to FIG. 2, the operation of the radio base station provided with the inter-radio base station synchronizer according to the present embodiment will be described. First, when the master radio base station 10 is first connected to the digital public line, the line interface unit 11 extracts the frame synchronization signal A from the digital public line and supplies it to the timing control unit 15. The TDMA synchronization signal generation unit 151 which has received the frame synchronization signal A
Generates a TDMA frame sync signal B based on the frame sync signal A.

When the radio base station functions as the master radio base station 10, the TDMA frame synchronization signal D is not generated and the selector unit 153 receives the TDMA signal as described above.
Since only the frame synchronization signal B is input, the selector unit 153 selects the TDMA frame synchronization signal B and outputs T to the wireless transmission unit 14 and the external slave wireless base station 20.
The DMA frame synchronization signal C is transmitted.

Since the slave radio base station 20 is also connected to the digital public line, its line interface unit 21 extracts the frame synchronization signal A1. The extracted frame synchronization signal A1 is transmitted to the TDMA synchronization signal generation unit 251 and the TDMA frame synchronization signal generation unit 2
52.

The slave radio base station 20 is supplied with the TDMA frame synchronization signal E from the master radio base station 10. The TDMA frame synchronization signal window unit 252 in the slave radio base station 20 uses the same frame synchronization signal A1 as the frame synchronization signal A and the TDMA frame synchronization signal E from the master radio base station 10 to transmit the TDMA frame synchronization signal as described later. Generate D1. This T
The DMA frame synchronization signal D1 and the TDMA frame synchronization signal B generated by the master radio base station 10 have the same phase (frame synchronization timing) (described later).

The frame synchronization in the slave radio base station 20 may be performed only once, for example, when the power is turned on. After that, the frame synchronization is held in the frame synchronization holding means described above. The stations 10 and 20 do not lose synchronization, and there is no need to resynchronize. Therefore, after performing frame synchronization once, the TDMA frame synchronization signals C and C1 generated for each frame are used only for wireless transmission to the mobile station, and the TDMA frame synchronization signal E is used in the TDMA frame synchronization signal window unit 252. Will be ignored.

Here, the method of frame synchronization in the TDMA frame synchronization signal window unit 252 will be described with reference to FIG. First, the slave radio base station 20
Is connected to the master radio base station 10 or when the power is turned on or the like, the TDMA frame synchronization signal window unit 25
A frame synchronization signal A1 and a TDMA frame synchronization signal E from the master radio base station 20 are input to 2. TD
As shown in FIG. 3, the MA frame synchronization signal window unit 252 has a window with a time width T1 from the fall ↓ of the frame synchronization signal A1 and the fall of the TDMA frame synchronization signal E from the master radio base station 10. ↓
When it enters into this window, it is considered that the delay of the TDMA frame synchronization signal E is due to the transmission delay and the frame is synchronized, and thereafter, the TDMA frame synchronization signal window unit 252 outputs based on the frame synchronization signal A1. The phase of the TDMA frame synchronization signal D1 is generated as an α point (falling point of the frame synchronization signal A).

The time width T1 is determined by the transmission delay T11 proportional to the distance between the radio base stations, which is determined based on the maximum extension distance between the master radio base station and the slave radio base stations. That is, if the relation of T1> T11 is satisfied, it is satisfied. Therefore, normally, the frame synchronization signal E does not deviate from the time width T1.

As described above, the window T1 starting from the falling ↓ of the frame synchronization signal A1 is provided, and the time T11 from the falling ↓ of the frame synchronization signal A1 to the falling ↓ of the TDMA frame synchronization signal E is within the window T1. If so, the phase (occurrence timing) of the TDMA frame synchronization signal D1 to be output is determined by setting the α point as the starting point, and the frame synchronization is determined.
The A-frame synchronization signal D1 is output. In this way,
The phase (generation timing) of the TDMA frame synchronization signal B of the master radio base station 10 and the T of the slave radio base station 20
Phase of DMA frame synchronization signal D1 (generation timing)
To establish the frame synchronization of the wireless channel.

Selector unit 25 of slave radio base station 20
3, when the TDMA frame synchronization signal B1 and the TDMA frame synchronization signal D1 are simultaneously input, T
The DMA frame synchronization signal D1 is preferentially selected to select the TDM
The A-frame synchronization signal C1 is output. Further, the TDMA frame synchronization signal window unit 252 includes a unit such as a counter for holding the frame synchronization, and even when the TDMA frame synchronization signal E from the master radio base station 10 disappears, the TDMA frame synchronization signal E before the disappearance. TDM according to the phase of frame synchronization (generation timing)
The output of the A frame synchronization signal D1 is continued, and the selector unit 2
53 outputs as a TDMA frame synchronization signal C1 to another slave radio base station.

In this way, even if the master radio base station 10 goes down, the slave radio base station 20 can continue the radio channel transmission without stopping the radio transmission, and the slave radio base station 20 can continue. Operates as a master wireless base station, other slave wireless base stations connected to the slave wireless base station 20 can continue wireless channel transmission without stopping wireless transmission.

Next, a method of connecting the master radio base station and a plurality of slave radio base stations will be described with reference to FIG.
That is, as shown in FIG. 4, the master radio base station 1
01 as a base point, a plurality of slave radio base stations 102 to
n are connected in series via a connection line for the TDMA frame synchronization signal. With this connection, the master radio base station 1
01 or any one of the slave radio base stations 102 to n goes down, the radio base station after the down radio base station becomes the master radio base station and sends a TDMA frame synchronization signal to the slave radio base stations thereafter. Since E is sent,
Subsequent slave radio base stations can continue to transmit on the radio channel without going down.

As described above, according to the present embodiment, the line interface unit 11 in the master radio base station 10 receives the frame synchronization signal A from the digital public line.
And the timing control unit 15 generates a TDMA frame synchronization signal C from the frame synchronization signal A and supplies it to the wireless transmission unit 14 and the slave wireless base station 20.

In the slave radio base station 20, based on the TDMA frame synchronization signal E from the master radio base station 10, the TDMA frame synchronization signal window unit 252 of the timing control unit 25 sets the phase of the TDMA frame synchronization signal D1 to TDMA frame synchronization. Match to signal B. In this way, the frame synchronization of the wireless channels transmitted from each wireless base station can be matched.

Further, the TDMA frame synchronization signal E is supplied from the master radio base station 10 by supplying the TDMA frame synchronization signal E generated by the timing control unit 25 of the slave radio base station 20 to another slave radio base station. Even if it disappears, the frame synchronization of the wireless channel can be maintained without stopping the wireless transmission by generating the TDMA frame synchronization signal that maintains the generation timing of the frame synchronization until then.

[0039]

The radio base station apparatus according to the present invention is configured as described above, and in particular, each radio base station has a timing control section including a TDMA frame synchronization signal window section, a TDMA synchronization signal generation section and a selector section. And TDMA in the master radio base station and each slave radio base station
By setting the generation timing of the frame synchronization signal to be the same, the frame synchronization of the radio channel between all the radio base stations is established, and the master radio base station or the slave radio base station functioning as the master radio base station is Even if it goes down, the generation timing of the TDMA frame synchronization signal E generated by the slave radio base station is generated at the same timing as the previous timing, so that the radio transmission between the radio base stations can be performed without stopping the radio transmission. It is possible to maintain the frame synchronization of the channels and improve the utilization efficiency.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a wireless base station including a wireless base station synchronization device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a master wireless base station and a slave wireless base station configured based on the wireless base station shown in FIG.

FIG. 3 is a timing diagram for explaining the operation of the TDMA frame synchronization signal window unit shown in FIG.

FIG. 4 is a configuration diagram of a digital wireless communication system showing a connection between a master wireless base station and a slave wireless base station according to an embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a master radio base station and a slave radio base station including a synchronization device for synchronizing conventional radio base stations.

[Explanation of symbols]

 1 wireless base station 10 master wireless base station 11 line interface unit 12 TDMA control unit 13 wireless control unit 14 wireless transmission unit 15 timing control unit 151 TDMA synchronization signal generation unit 152 TDMA frame synchronization signal window unit 153 selector unit A frame synchronization signal B , C, D TDMA frame synchronization signal 20 Slave radio base station 21 Line interface unit 22 TDMA control unit 23 Radio control unit 24 Radio transmission unit 25 Timing control unit 251 TDMA synchronization signal generation unit 252 TDMA frame synchronization signal window unit 253 Selector unit A1 Frame synchronization signal B1, C1 TDMA frame synchronization signal D1, E TDMA frame synchronization signal 10A Master radio base station 11A Line interface unit 12A TDMA control unit 13A Radio signal No. Modulation section 14A Radio transmission section 15A Variable frequency oscillation section 16A Timing generation section 17 Delay section 10B Slave radio base station 11B Line interface section 12B TDMA control section 13B Radio signal modulation section 14B Radio transmission section 15B Variable frequency oscillation section 18 Radio frame transmission Timing signal generator

Claims (5)

[Claims] 1. A frame synchronization signal generating means for extracting a frame synchronization signal from a digital public line, and a timing control section for generating a TDMA frame synchronization signal for determining a transmission timing of a radio channel from the extracted frame synchronization signal. A master radio base station having means for wirelessly transmitting to a mobile station, a frame synchronization signal generation means for extracting a frame synchronization signal from a digital public line, and a transmission timing of a wireless channel determined from the extracted frame synchronization signal. And a slave radio base station having means for wirelessly transmitting to the mobile station. The timing control unit for generating the TDMA frame sync signal of the slave radio base station is The TDMA frame transmitted from the master radio base station The radio base station apparatus characterized by comprising a TDMA frame synchronizing signal generating means for receiving the synchronization signal to generate a TDMA frame synchronizing signal of the TDMA frame synchronizing signal and the same timing from the master radio base station. 2. A frame synchronization signal generating means for extracting a frame synchronization signal from a digital public line, and a timing control section for generating a TDMA frame synchronization signal for determining a transmission timing of a radio channel from the extracted frame synchronization signal. A master radio base station having means for wirelessly transmitting to a mobile station, a frame synchronization signal generation means for extracting a frame synchronization signal from a digital public line, and a transmission timing of a wireless channel determined from the extracted frame synchronization signal. And a slave radio base station having means for wirelessly transmitting to the mobile station. The timing control unit for generating the TDMA frame sync signal of the slave radio base station is The TDMA frame transmitted from the master radio base station A TDMA frame synchronization signal generating means for receiving a synchronization signal and generating a TDMA frame synchronization signal at the same timing as the TDMA frame synchronization signal from the master radio base station; and a means for holding the generated TDMA frame synchronization. A radio base station device characterized by the above. 3. A means for maintaining the TDMA frame synchronization by continuously connecting the master radio base station and a plurality of slave radio base stations through a connection line for transmitting a TDMA frame synchronization signal with the master radio base station as a base point. Outputs the signal indicating the held TDMA frame synchronization at each frame-synchronized frame timing for wireless transmission, and sends the signal to the slave wireless base station to be connected next to the master wireless base station and a plurality of wireless base stations. The radio base station apparatus according to claim 2, wherein the TDMA frame synchronization signals of all slave radio base stations are transmitted at the same timing. 4. A timing control unit for generating the TDMA frame synchronization signal in the master radio base station and the slave radio base station, TDMA synchronization signal generation means for generating a TDMA frame synchronization signal from the extracted frame synchronization signal, TDMA received from master radio base station
TDMA frame synchronization signal generation means for generating a TDMA frame synchronization signal based on a frame synchronization signal;
And a selector unit for selecting and outputting either the TDMA frame synchronization signal from the DMA synchronization signal generation unit or the TDMA frame synchronization signal from the TDMA frame synchronization signal generation unit, and the selector unit is connected to the master radio base station. The TDMA frame synchronization signal from the TDMA synchronization signal generation means is selected in a certain case, and the TDMA frame synchronization signal from the TDMA frame synchronization signal generation means is selected in a slave radio base station. The radio base station device according to Item 1, 2 or 3. 5. A master radio base station and a slave radio base station extract a frame synchronization signal from a digital public line and generate a TDMA frame synchronization signal for determining a transmission timing of a radio channel from the extracted frame synchronization signal. And a step of wirelessly transmitting to the mobile station using the generated TDMA frame synchronization signal, wherein the step of generating the TDMA frame synchronization signal in the slave wireless base station includes the TDMA frame transmitted from the master wireless base station. The synchronization signal is received to generate a TDMA frame synchronization signal at the same timing as the TDMA frame synchronization signal from the master radio base station, and the generated TD
Holds MA frame sync signal and holds the held TDM
A method for synchronizing between radio base stations, comprising each step of outputting an A frame synchronization signal for radio transmission and for frame synchronization of other slave radio base stations.