JP2000197108A - Synchronization setup method in wll communication and its system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain communication with high quality for a wireless local loop WLL system by surely establishing synchronization for system components relating to a personal handy phone system PHS (PHS terminal base stations, repeater use subscriber units and WLL radio base stations) applied to the WLL system. SOLUTION: In the caw of radio channel connection of a PHS terminal base station 21 to a WLL radio base station 3 via a repeater use subscriber unit(RSU) 22, synchronization of time slots in a transmission reception mode among the PHS terminal base station 21, the RSU 22 and the WLL radio base station 3 is established. The PHS terminal base station 21, the RSU 22 and the WLL radio base station 3 respectively receive a GPS radio wave Wg to extract time information (pulses at an interval of one second) with high precision. A clock signal (5 5 ms) to match a TDMA./TDD time slot is generated from the pulses at an interval of one second. The PHS terminal bay station 21, the RSU 22 and the WLL radio base station 3 establish the synchronization of the time slots in the transmission reception mode by using this clock signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a wireless local loop (WLL: Wirel) in which a wired section is changed to a wireless section.
The present invention relates to a method and system for establishing synchronization in WLL communication for establishing synchronization when a digital cellular mobile telephone system (PDC) or a digital cordless telephone system (PHS / simple portable telephone system) is installed in a ESS Local Loop system.

[0002]

2. Description of the Related Art Conventionally, an analog public telephone network (PSTN)
Wireless local loop (WLL: Wireless Local Loop) that changes the wired line connection (wired section) between a switching center and a telephone in a home or a business office to a wireless line connection (wireless section) to facilitate maintenance and expansion. ) The system is well known. In such a WLL system, a telephone in a home or a business is connected to a fixed subscriber device, and the fixed subscriber device is connected to a WLL wireless base station connected to an exchange by a radio line.

[0003] In such a WLL system, a PDC in a cellular mobile telephone system (PDC) or a digital cordless telephone system (PHS / simple portable telephone system) is used.
There is a mobile telephone system that accommodates a PDC / PHS mobile phone by changing a DC cell base station or a PHS outdoor device to a wireless line connection.

For example, in a general PHS, only an A interface (RCR) is provided between a PHS terminal and a PHS outdoor device.
(ARIB) -STD-28)
Others are wired sections. In this wired section, ISDN
/ PSTN public line or dedicated line is used. This transmission line uses a metal wire cable or an optical fiber cable, and in a PHS in which a very large number of microcells having a narrow service area are arranged, it takes time to lay and maintain the microcells. In other words, when a larger number of PHS outdoor devices are installed to expand the range of use, the installation cost increases, and it is difficult to quickly expand the range of use.

[0005] For this reason, a large number of PHS outdoor devices are connected to WLL.
By accommodating the wireless base station with a wireless line connection (wireless section), it is possible to easily add an HS outdoor device,
Further, a wireless line connects the WLL wireless base station and the PHS connection device accommodated in the exchange in the PSTN,
An example in which the PHS area can be expanded more easily has been proposed by the present applicant.

[0006] Such a PHS outdoor device (preferably a PHS
The radio base station is composed of a PHS terminal base station and a repeater subscriber unit (repeater subscriber unit), and includes a PHS terminal base station and a PHS terminal.
The terminal is connected to the base station by a wireless line, and the base station for the PHS terminal and the subscriber unit for the repeater are connected by a metal cable and in the I 'format (the order of the transmission signal of the control field at the layer 2 in the OSI 7 layer model). Information for security (ISDN-defined numbered information transfer I
Format)). Furthermore, the repeater subscriber unit and the WLL wireless base station are connected by a wireless line.

[0007] Further, while the WLL wireless base station is connected to the PHS connection device via a radio line, the PHS connection device is connected to the PHS connection device.
STN exchange and V5.2 interface (ITU-T
G series recommendation / G. 965).
A number of fixed subscriber units accommodating telephones in homes and business establishments are connected to the WLL wireless base station by a wireless line, and the WLL wireless base station is wired to an exchange.

In such a PHS outdoor apparatus (PHS radio base station), the base station for the PHS terminal and the subscriber unit for the repeater are adjacent to each other, and the transmission radio waves wrap around each other. Normal TDMA /
An out-of-synchronization in which a TDD time slot cannot be generated is likely to occur. In addition, the call voice may be deteriorated due to cross modulation or the like. For this reason, the PHS terminal base station uses an omni-directional antenna, while the repeater subscriber unit uses a directional antenna having directivity to the WLL wireless base station, and Radiation intensity to the base station for
For example, the out-of-synchronization may occur depending on the frequency relationship of a clock signal or the like as described above.

In other words, when transmitting from the WLL radio base station, both the repeater subscriber unit and the PHS terminal base station are in the transmission mode, and when receiving the WLL radio base station, the repeater subscriber unit and the PHS terminal are used. Both the base stations need to be set to the reception mode. That is, it is necessary to establish time slot synchronization in the transmission / reception mode.

[0010]

As described above, the above conventional example has a drawback that out-of-synchronization easily occurs in the PHS terminal base station, the repeater subscriber unit and the WLL wireless base station in the PHS outdoor equipment.

The present invention solves the above-mentioned problems in the prior art. The present invention is applied to a WLL system and measures the synchronization at the time of transmission and reception between a terminal base station, a repeater device, and a WLL wireless base station by omnidirectional measurement. System (GP
An object of the present invention is to provide a method for establishing synchronization in WLL communication and a system therefor, which can be established using a received signal such as S: Globl Positioning System), and which enables high-quality communication.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a terminal base station connected to a wireless local loop (WLL) radio base station through a repeater device, and a terminal base station and a repeater. Device and W
In a method for establishing synchronization in WLL communication for establishing synchronization of an LL wireless base station, a terminal base station, a repeater device, and a WLL wireless base station receive a wireless signal including time information, and receive time information in the received wireless received signal. Is generated, and a clock signal corresponding to a time slot is generated from the time information. Then, the terminal base station, the repeater device, and the WLL wireless base station establish synchronization of the time slot at the time of transmission / reception by the clock signal. I have.

The WLL communication synchronization establishing system of the present invention comprises:
When a base station for a terminal that accommodates a mobile terminal by wireless line connection is connected to a WLL wireless base station via a repeater device and a wireless line, the terminal base station, the repeater device, and the synchronization of the WLL wireless base station are established. Terminal base station,
Receiving means for receiving a radio signal including time information to the repeater device and the WLL radio base station; extracting means for extracting the time information received by the receiving means; and a clock corresponding to a time slot from the time information extracted by the extracting means. A clock generating means for generating a signal; and a synchronization establishing means for establishing synchronization of a time slot at the time of transmission and reception by the terminal base station, the repeater device and the WLL wireless base station by the clock signal generated by the clock generating means. is there.

[0014] The time information is a pulse signal obtained from a GPS radio wave reception signal.
The configuration is a pulse signal obtained from a reception signal of a radio wave transmitted from a terrestrial radio transmission station.

[0015] The transmission system in the digital cellular mobile telephone system (PDC) or digital cordless telephone system (PHS) is applied to the mobile terminal, terminal base station, repeater device, and WLL station radio base station.

[0016] The WLL radio base station may further include a connection device for accommodating the WLL radio base station in a wired telephone network.

The WLL wireless base station and the connection device are connected by a wireless line or a wired line.

A fixed subscriber unit for transmitting / receiving a fixed communication device through a wireless line connection with the WLL wireless base station is further provided.

As the terminal base station, a radio transmission / reception unit for performing radio transmission / reception with a mobile terminal, a modulation / demodulation unit for performing QPSK modulation / demodulation, a connection interface unit for processing an interface with a repeater device, and a GPS radio wave A GPS receiver that outputs a pulse signal of time information from a radio reception signal, and a clock signal for establishing synchronization of a time slot at the time of transmission and reception from the pulse signal output by the GPS receiver; , A synchronization setting unit that processes synchronization establishment of a time slot, a mobile omnidirectional antenna connected to a wireless transmitting / receiving unit, and a GPS receiving antenna connected to a GPS receiver.

As the repeater device, a connection interface unit for processing an interface with a terminal base station, a modem unit for QPSK modulation / demodulation, and a wireless transmission / reception unit for wireless communication with a WLL wireless base station. A radio transmitter / receiver, a GPS receiver for outputting a pulse signal of time information from a radio reception signal of a GPS radio wave, and a clock signal for establishing synchronization of a time slot for transmission and reception from the pulse signal output by the GPS receiver And a synchronization setting unit that processes synchronization establishment of time slots during transmission and reception.
The configuration includes an omni-directional antenna for a WLL wireless base station connected to a wireless transmitting / receiving unit and a GPS receiving antenna connected to a GPS receiver.

As the WLL wireless base station, a connection interface unit for processing an interface with a wired communication network, a modem unit for QPSK modulation / demodulation,
A wireless transmitting / receiving unit for performing wireless transmission / reception to / from a connection device for accommodating the L wireless base station in a wired telephone network; and a G for outputting a time information pulse signal from a wireless reception signal of a GPS radio wave
A synchronization setting unit that generates a clock signal for establishing synchronization of a time slot during transmission and reception from a pulse signal output from a PS receiver and a GPS receiver, and that processes synchronization establishment of a time slot during transmission and reception. And an omnidirectional antenna for a WLL wireless base station connected to a wireless transmitting / receiving unit;
And a GPS receiving antenna connected to the GPS receiver.

A PLL for outputting an oscillation signal locked by closed loop control based on time information extracted by the extraction means, a clock signal generation unit for generating an oscillation signal from the PLL into a clock signal, The configuration includes a terminal base station, a repeater device, and a synchronization pull-in processing unit for establishing time slot synchronization at the time of transmission and reception in the WLL wireless base station based on a clock signal from a signal generation unit.

In the method and system for establishing synchronization in the WLL communication according to the present invention, the terminal base station, the repeater device, and the WLL wireless base station receive one wireless signal including time information such as a GPS radio wave. The time information is extracted, and a clock signal matching the time slot at the time of transmission / reception is generated from the time information, so that the terminal base station, the repeater device, and the WLL wireless base station establish synchronization in transmission.

As a result, it becomes possible to establish synchronization of time slots at the time of transmission and reception between the terminal base station, the repeater device, and the WLL wireless base station applied to the WLL system, thereby enabling high-quality communication.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a method for establishing synchronization in WLL communication and a system thereof according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing a method for establishing synchronization in WLL communication and an overall configuration of the system according to the present invention. In FIG. 1, the WLL communication synchronization establishment system includes an RCR (ARIB) -STD-2.
A PHS terminal 1 for performing a telephone call, facsimile or data communication (hereinafter, referred to only as a telephone call) based on the 8 standard, and a PHS wireless base station 2 for accommodating the PHS terminal 1 by a wireless line connection (A interface) are provided. ing.

Further, this WLL communication synchronization establishment system accommodates a large number of PHS wireless base stations 2 and a large number of fixed subscriber devices 6 with wireless line connections Wea, Web.
LL wireless base station 3, PHS connection device 4 for connecting WLL wireless base station 3 to PSTN by wireless line connection Wm or wired line connection, local exchange (exchange station) 5 in PSTN, and fixed in PSTN A fixed subscriber unit 6 for accommodating a telephone 6a as a communication device by a wireless line connection Web instead of a wired line connection is provided.

Further, the GPS radio signal Wg orbiting the sky.
Has a GPS satellite 7 transmitting. In a vehicle navigation system or the like, radio waves from three GPS satellites (or four GPS satellites) in the sky are received and two-dimensional position information of latitude and longitude (or three-dimensional information of latitude, longitude and altitude) is received. Here, only the GPS radio wave Wg from one GPS satellite 7 is received and used.

The PHS wireless base station 2 includes a PHS terminal base station 21 for accommodating a large number of PHS terminals 1 through a wireless line connection Wp, and the PHS terminal base station 21 is replaced by a wireless line connection instead of a wired line connection. And a repeater subscriber unit 22 for accommodating the WLL wireless base station 3. Also, the PHS connection device 4
Is connected to a maintenance terminal 4a for performing various PHS-related settings. Furthermore, a number of fixed subscriber units 6
Each house a PSTN telephone 6a.

FIG. 2 is a block diagram showing a detailed configuration of the PHS terminal base station 21 in FIG. The PHS terminal base station 21 includes a radio transmission / reception unit 21a that performs radio transmission and reception with the PHS terminal 1, and a modulation / demodulation unit 21b that performs QPSK modulation / demodulation.
And a connection interface (I / F) unit 2 for processing an interface with the repeater subscriber unit 22
1c, a GPS receiver 21d as receiving means for outputting pulses at one-second intervals in the spread spectrum demodulated signal obtained by receiving the GPS radio wave Wg, and a TDMA / TDD time slot in the PHS from the one-second pulses. Setting unit 21e as an extraction unit, a clock generation unit, and a synchronization establishment unit that generates a clock signal that matches the clock signal
And an omnidirectional antenna 21f for a mobile object connected to the wireless transmitting / receiving unit 21a, and a GPS receiving antenna 21g connected to a GPS receiver 21d.

FIG. 3 is a block diagram showing a detailed configuration of the repeater subscriber unit (repeater subscriber unit) 22 in FIG. The repeater subscriber unit 22 includes a connection I / F unit 22a that processes an interface with the PHS terminal base station 21, and a QPSK.
A modulation / demodulation unit 22b for performing modulation / demodulation, a radio transmission / reception unit 22c for performing radio transmission / reception with the WLL radio base station 3,
G as a receiving means for outputting a pulse at an interval of one second in a spread spectrum demodulated signal having received a GPS radio wave Wg.
A receiver for PS 22d, a synchronizing setting unit 22e as a clock generating unit and a synchronizing establishing unit for generating a clock signal matching a TDMA / TDD time slot in the PHS from a pulse at one second interval, and a radio transmitting / receiving unit 22c And a non-directional antenna 22f for a WLL wireless base station (WBS) connected to the GPS receiver 22d and a GPS receiving antenna 22g connected to a GPS receiver 22d.

FIG. 4 shows the synchronization setting section 21 in FIGS. 2 and 3.
It is a block diagram which shows the detailed structure of e and 22e. The synchronization setting units 21e and 22e include a phase comparator 30 in a closed loop control PLL, a loop filter 31 for converting a phase comparison signal into DC, a frequency divider 32 for dividing the oscillation output,
A voltage-controlled oscillator (VCO) 33 that outputs an oscillation signal locked by a control voltage; a clock signal generator 34 that generates an oscillation signal into a predetermined clock signal; a PHS terminal base station 21; a repeater subscriber unit 22;
A synchronization pull-in processing unit 35 for establishing synchronization in the transmission / reception mode of the LL wireless base station 3.

The WLL wireless base station 3 has basically the same configuration as the PHS terminal base station 21. That is, together with a radio transmission / reception unit, a modulation / demodulation unit, a connection I / F unit, a GPS receiver, and a synchronization setting unit, an omnidirectional antenna 3a for a subscriber unit (RSU) for repeaters and a GPS
Receiving antenna 3b and antenna 3 for PHS connection device
c. The WLL wireless base station 3 accommodates a large number of PHS wireless base stations 2 installed for each microcell by a wireless line connection Wea. An omni-directional antenna (omni-directional antenna 3a for RSU) for satisfactorily performing a wireless connection Wea is provided.

The PHS connection device 4 is provided with an antenna 4a for a WLL wireless base station (WBS).
Note that the WLL wireless base station 3 and the PHS connection device 4 may be connected by a metal wire cable or an optical fiber cable instead of the wireless line connection Wm.

The PHS terminal 1 has a general configuration. That is, an antenna, a radio transmission / reception unit, a reception field strength detection (RSSI) unit, a fast switching synthesizer (DLPS),
QPSK modulation / demodulation unit, TDMA / TDD unit, codec (CODEC) unit, microphone / speaker, control unit,
The configuration includes a liquid crystal display, a call display unit, an input operation unit, a memory, an I / F unit 17, and the like.

Next, the operation of the embodiment will be described.
FIG. 5 is a timing chart for explaining the operation in the embodiment. First, the overall operation will be described with reference to FIGS. PSTN local exchange 5
An RLL system accommodating a telephone 6a through a fixed subscriber unit 6 connected to the LL wireless base station 3 via a wireless line,
A PHS based on the CR (ARIB) -STD-28 standard is provided. That is, the PHS wireless base station 2, the WLL wireless base station 3, and the PHS
A connection device 4 is provided.

The telephone 6a is connected to the fixed subscriber unit 6 and the WLL wireless base station 3 by a wireless line connection Web and the WLL wireless base station 3 and the local exchange 5 by a wired line connection. Transmission and reception by PSTN (call)
The description is omitted below.

Next, in the PHS, the PHS terminal 1
A wireless line connection Wp (A interface / RCR (AR) between the mobile base omnidirectional antenna 21f of the wireless base station 2
IB) -STD-28). Also,
In the PHS radio base station 2, the PHS terminal base station 21 and the repeater subscriber unit 22 are connected by an interface of I ′ format. That is, O
Transmission and reception are performed based on guarantee information for the order of transmission signals in the control field in layer 2 in the SI7 hierarchical model.

The repeater subscriber unit 22 includes an omnidirectional antenna 22f for WBS and a WLL.
Transmission and reception are performed by the wireless channel connection Wea of the wireless base station 3 through the omnidirectional antenna 3a for RSU. Furthermore, W
The LL wireless base station 3 and the PHS connection device 4 are connected to the PHS connection device antenna 3c and the WBS
The transmission and reception are performed by the wireless line connection Wm between the wireless communication apparatus and the wireless communication apparatus. Also, the PHS connection device 4 communicates with the local exchange 5 with V5.
2 interface (ITU-TG G series recommendation / G.
965). With these operations, the PHS terminal 1 can make a PSTN call through the local exchange 5.

In this operation, the PHS radio base station 2 and W
The LL wireless base station 3 receives the GPS radio wave W from the GPS satellite 7.
g in the spread spectrum demodulated signal (C / A signal / P signal) generated from the GPS radio wave Wg.
The clock signal shown in FIG. 5B is generated by dividing the frequency of the pulse at one second interval shown in FIG. Thereafter, the clock signal causes the TDMA / TDD as shown in FIGS.
Establishes synchronization of time slots in the transmission / reception mode. In the PHS radio base station 2, the PHS radio base station 2 and the repeater subscriber unit 22 each receive the GPS radio wave Wg and generate a clock signal obtained by dividing a 1-second pulse in the demodulated spread spectrum demodulated signal. , Establishes synchronization of time slots in the transmission / reception mode in TDMA / TDD.

The pulses at one-second intervals are used, for example, to extract a relative time for displaying a traveling distance on a map in navigation.

The spread spectrum demodulated signal is a well-known C / A signal / P signal (Gold code), and is navigation data that is primarily modulated with 50 b / s data before carrier wave modulation. The navigation data includes orbit data of GPS satellite 7, correction data, almanac (calendar) of all satellites,
It is repeatedly transmitted with 30 seconds as one cycle.

Also, the PHS terminal 1 and the PHS radio base station 2
In the meantime, as shown in FIG. 5, communication is performed in four time slots for each uplink and downlink, and a preamble field for carrier synchronization and clock synchronization after a known synchronization word field and a guard time in a frame is provided. Synchronization is established by the dependent synchronization method.

Next, the main part of this operation will be described in detail.
First, in the PHS terminal base station 21 in the PHS wireless base station 2 shown in FIG. 2, the wireless transmission / reception unit 21a performs wireless communication with the PHS terminal 1 through the wireless line connection Wp through the mobile omnidirectional antenna 21f. . Wireless transceiver 21
a performs high frequency amplification, frequency conversion, intermediate frequency (IF) amplification, automatic gain control (AGC) in reception, and frequency conversion and power amplification in transmission.

Further, the modulation / demodulation unit 21b performs QPSK modulation / modulation.
Demodulation is performed, and transmission to the repeater subscriber unit 22 is performed through the connection I / F unit 21c. in this case,
The GPS receiver 21d is a GPS receiver antenna 21g.
Receives the GPS radio wave Wg through the
5 in the spread spectrum demodulated signal generated from
The frequency of the pulse at one second intervals shown in FIG.
A clock signal shown in (b) is generated. The synchronization setting unit 21e supplies the clock signal to the wireless transmission / reception unit 21a, the modulation / demodulation unit 21b, and the connection I / F unit 21c to establish the synchronization of the time slot in the transmission / reception mode.

Next, the repeater subscriber unit 22 shown in FIG. 3 operates basically in the same manner as the PHS terminal base station 21. That is, when the connection I / F unit 22a
Transmission and reception are performed by interface processing with the S terminal base station 21. Further, the modulation / demodulation unit 22b performs QPSK modulation / demodulation, and the radio transmission / reception unit 22c transmits a radio link between the WLL radio base station 3 and the omnidirectional antenna 3a for RSU via the omnidirectional antenna 22f for WBS. Connection W
Wireless transmission and reception are performed through ea.

Also in this case, the GPS receiver 22 d
The GPS radio wave Wg is received through the PS receiving antenna 22g, and the pulse of the one-second interval shown in FIG. 5A in the spread spectrum demodulated signal generated from the GPS radio wave Wg is frequency-divided. The clock signal shown is generated. This clock signal is transmitted to the synchronization setting unit 22e by the radio transmitting / receiving unit 22a, the modem unit 22b, and the connection I / F unit 22c.
To establish time slot synchronization in the transmission / reception mode described above.

As a result, the time slots in the transmission / reception mode among the PHS terminal base station 21, the repeater subscriber unit 22, and the WLL radio base station 3 are completely synchronized.

Next, the synchronization setting units 21e and 22 shown in FIG.
e performs a well-known PLL operation.
The one-second pulses from the S receivers 21d and 22d are input to the phase comparator 30, and the output signal obtained by the phase comparison is converted to DC through the loop filter 31. This DC voltage is input to the voltage control terminal of the voltage controlled oscillator 33. The voltage controlled oscillator 33 is locked to the oscillation frequency based on the input voltage. The output signal of the voltage controlled oscillator 33 is divided by the frequency divider 32.
And input to the phase comparator 30. Phase comparator 30
Outputs a comparison signal having a value corresponding to the phase shift. With this closed loop control, the voltage controlled oscillator 33
A constant oscillation output synchronized with the one-second pulse from the receivers 21d and 22d is obtained.

The oscillation signal from the voltage controlled oscillator 33 is input to the clock signal generator 34, where
A 5 ms clock signal corresponding to the TDMA / TDD time slot in the PHS shown in (b) is generated. This clock signal is supplied to each unit as described above.

In this embodiment, an example in which a PHS is added to a WLL system has been described. However, a cellular mobile telephone system (PDC) can be applied as it is.
In this embodiment, the GPS radio wave Wg from the GPS satellite 7 is used, but other radio waves can be used. That is, a time service system that wirelessly transmits extremely high-precision time information by an atomic clock or the like can be used. For example, a high-precision time service system (radio clock) using a long wave band or short wave band from a terrestrial radio station
, And the time slot synchronization in the transmission / reception mode can be established in the same manner as described above.

[0051]

As is apparent from the above description, according to the method and system for establishing synchronization in the WLL communication of the present invention, the terminal base station, the repeater device, and the WLL wireless base station can transmit time information such as GPS radio waves. , A time signal is extracted and time information is extracted, and a clock signal matching a time slot at the time of transmission / reception is generated from the time information, and the terminal base station, the repeater device, and the WLL wireless base station perform transmission and reception. Synchronization is established.

As a result, it becomes possible to establish synchronization of time slots at the time of transmission and reception between the terminal base station, the repeater device, and the WLL wireless base station applied to the WLL system, thereby enabling high-quality communication.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a synchronization establishment method in WLL communication and an overall configuration of the system according to the present invention.

FIG. 2 is a block diagram showing a detailed internal configuration of a PHS terminal base station in FIG.

FIG. 3 is a block diagram showing a detailed internal configuration of a repeater subscriber unit in FIG. 1;

FIG. 4 is a block diagram showing a detailed internal configuration of a synchronization setting unit in FIGS. 2 and 3;

FIG. 5 is a timing chart for explaining an operation in the embodiment.

[Explanation of symbols]

 Reference Signs List 1 PHS terminal 2 PHS wireless base station 3 WLL wireless base station 3a Omnidirectional antenna for RSU 3b, 21g, 22g GPS receiving antenna 3c Antenna for PHS connecting device 4 PHS connecting device 4a Antenna for WBS 5 Local exchange 6 Fixed subscriber unit 7 GPS satellite 21 PHS terminal base station 21a, 22c Radio transmitting / receiving unit 21b, 22b Modulation / demodulation unit 21d, 22d GPS receiver 21e, 22e Synchronization setting unit 21f Mobile omnidirectional antenna 22 Repeater subscriber unit 22f Omnidirectional antenna for WBS Wea, Web, Wm, Wp Wireless line connection Wg GPS radio wave

Claims (12)

[Claims] A terminal base station connects to a wireless local loop (WLL) radio base station via a repeater device and establishes a radio link, and establishes synchronization between the terminal base station, the repeater device and the WLL radio base station.
In the method for establishing synchronization in communication, the terminal base station, the repeater device, and the WLL wireless base station receive a wireless signal including time information, extract time information in the received wireless received signal, And generating a clock signal corresponding to the time slot from the following. Then, the terminal base station, the repeater device and the WLL wireless base station establish synchronization of the time slot at the time of transmission / reception by the clock signal. WL
A method for establishing synchronization in L communication. 2. When a terminal base station accommodating a mobile terminal by wireless line connection is connected to a WLL wireless base station via a repeater device, the terminal base station, the repeater device, and the WLL wireless base station are connected to each other. In the WLL communication synchronization establishing system for establishing synchronization, the terminal base station, the repeater device, and the WLL wireless base station receive a wireless signal including time information, and receive the time information received by the receiving means. Extracting means for extracting; clock generating means for generating a clock signal corresponding to a time slot from the time information extracted by the extracting means; the terminal base station, the repeater device, and the clock signal generated by the clock generating means. Synchronization establishing means for establishing synchronization of time slots during transmission and reception by the WLL wireless base station. WLL communication synchronization establishment system according to claim Rukoto. 3. The WLL communication synchronization establishing system according to claim 2, wherein the time information is a pulse signal obtained from a received signal of a GPS radio wave. 4. The WLL communication synchronization establishment system according to claim 2, wherein the time information is a pulse signal obtained from a reception signal of a radio wave transmitted from a terrestrial radio transmission station. 5. A transmission method in a digital cellular mobile telephone system (PDC) or a digital cordless telephone system (PHS) is applied to the mobile terminal, the terminal base station, the repeater device, and the WLL station radio base station. 3. The WLL communication synchronization establishment system according to claim 2, wherein: 6. The WLL communication synchronization establishment system according to claim 2, further comprising a connection device for accommodating said WLL wireless base station in a wired telephone network. 7. The WLL communication synchronization establishing system according to claim 6, wherein the WLL wireless base station and the connection device are connected by a wireless line or a wired line. 8. The WL according to claim 2, further comprising a fixed subscriber unit for a fixed communication device to perform transmission and reception by connecting to the WLL wireless base station and a wireless line.
L communication synchronization establishment system. 9. As the terminal base station, a radio transmitting / receiving unit for performing radio transmission / reception with the mobile terminal, a modem unit for performing QPSK modulation / demodulation, and a connection interface unit for processing an interface with the repeater device. A GPS receiver that outputs a pulse signal of time information from a radio reception signal of a GPS radio wave, and a clock signal for establishing synchronization of a time slot during transmission and reception from the pulse signal output by the GPS receiver. A synchronization setting unit that processes synchronization establishment of a time slot at the time of transmission / reception, an omnidirectional antenna for a mobile object connected to the wireless transmission / reception unit, and a GPS reception antenna connected to the GPS receiver. The WLL communication synchronization establishment system according to claim 2, comprising: 10. The repeater device, a connection interface unit that processes an interface with the terminal base station, a modem unit that performs QPSK modulation / demodulation, and wireless transmission and reception between the WLL wireless base station And a GPS receiver that outputs a pulse signal of time information from a radio reception signal of a GPS radio wave, and establishes synchronization of a time slot during transmission and reception from the pulse signal output by the GPS receiver. A synchronization setting unit that generates a clock signal for performing synchronization, and processes synchronization establishment of a time slot during transmission and reception; an omnidirectional antenna for a WLL wireless base station connected to the wireless transmission and reception unit; The WLL communication synchronization establishing system according to claim 2, further comprising a GPS receiving antenna connected to the receiver. 11. A connection interface unit for processing an interface with a wired communication network, a modem unit for performing QPSK modulation / demodulation, and the WLL wireless base station accommodated in a wired telephone network as the WLL wireless base station. A wireless transmission / reception unit for performing wireless transmission / reception to / from a connection device, a GPS receiver for outputting a pulse signal of time information from a wireless reception signal of a GPS radio wave, and a pulse signal output by the GPS receiver. A synchronization setting unit that generates a clock signal for establishing synchronization of a time slot during transmission and reception and processes synchronization establishment of a time slot during transmission and reception; and a WLL wireless base station connected to the wireless transceiver. The WLL communication according to claim 2, further comprising: an omnidirectional antenna; and a GPS receiving antenna connected to the GPS receiver. Synchronization establishment system. 12. A PLL that outputs an oscillation signal locked by closed loop control based on time information extracted by an extraction unit as the synchronization setting unit, and a clock signal generation unit that generates an oscillation signal from the PLL into a clock signal. A synchronization pull-in processing unit for establishing synchronization of time slots at the time of transmission and reception in the terminal base station, the repeater device, and the WLL wireless base station based on a clock signal from the clock signal generation unit. The W according to any one of claims 10, 11, and 12, wherein
LL communication synchronization establishment system.