JPH1022909A - Digital cordless communication system using tdma system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To establish radio channel synchronization between radio base stations without regard to a time slot time between line interfaces and the time slot time of a radio channel. SOLUTION: In a digital cordless communication system by a TDMA system, in order to establish radio channel frame synchronization between the radio base stations in the system, the main equipment of the system 10 is provided with a synchronizing signal generating part 105, and each connecting part 103a to 103n corresponding to the radio base stations 104a to 104n is provided with a synchronizing pulse generating part for an interface part to extracts synchronizing information necessary for radio channel frame synchronization with the same timing through all the radio base stations. In addition, concerning the radio base stations, a synchronizing signal is extracted based on data from the main equipment 10 and a radio channel signal is sent out so as to establish the radio channel frame synchronization of each radio base station.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a digital cordless communication system or device using the TDMA system, and more particularly, to synchronize the frame synchronization of a radio channel between radio base stations connected to a digital cordless main device in the system. The present invention relates to a digital cordless communication system.

[0002]

2. Description of the Related Art Conventionally, as a digital cordless communication system using the TDMA system, for example, Japanese Patent Application Laid-Open No. 3-2839
The one described in Japanese Patent Publication No. 24 is known. That is,
FIG. 6 shows a typical configuration of such a conventional digital cordless system. As can be seen from FIG. 6, a time division multiplex communication path switch 1061, fixed telephone network interface circuits 1062a to 1062n, and a radio base station The interfaces 1063a to 1063n are connected by a time-division multiplex communication channel, and the frame synchronization pulse and the bit synchronization pulse supplied from the synchronization signal generation unit 1064 as a synchronization signal synchronize frame and bit synchronization with each other. Frame synchronization of the division multiplex communication path is established. As a result, time slots on the same radio frequency can be effectively used in adjacent radio zones, so that the frequency use efficiency between radio base stations can be improved.

[0003]

In the above-mentioned digital cordless communication system or apparatus, unless the number of time slots multiplexed in the frame synchronization pulse and the number of radio channels match, the number of radio base stations can be reduced. However, there is a problem that the frame synchronization of the wireless channels cannot be matched. The reason is shown below.

As shown in FIG. 6, a frame synchronization pulse and a bit synchronization pulse from a synchronization signal generator 1064 are transmitted to a radio base station interface circuit. Further, as shown in FIG. 7, in the radio base station interface circuit, a signal (line interface signal) from the switching device to the radio base station is generated based on the frame synchronization pulse F1, and based on the line interface signal, A synchronization pulse signal F2 is generated in the radio base station. The radio base station divides the interval between adjacent synchronization pulse signals F2 into the same number as the time slots multiplexed in the line interface signal (32 equal parts), and sets the start timing of the radio channel to the start timing of the line interface signal. Adjusted to fit. This achieves radio channel synchronization between the base stations.

Therefore, this method has a problem that when the number of multiplexed time slots between frame synchronization pulses and the number of multiplexed time slots of a radio channel are different, radio channel synchronization between radio base stations cannot be obtained.
A solution to this problem was required.

An object of the present invention is to establish radio channel synchronization between radio base stations regardless of the time slot time between line interfaces and the time slot time of a radio channel.

[0007]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides a digital cordless communication system main unit having a synchronizing signal generating unit and a synchronizing pulse generating unit for an interface unit at a radio base station connecting unit. A digital cordless system main unit capable of extracting synchronization information necessary for radio channel frame synchronization at the same timing in all radio base stations, and a synchronization signal is extracted based on data from the digital cordless system main unit. A wireless base station device for transmitting a wireless channel signal so as to achieve wireless channel frame synchronization of the wireless base station is proposed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention is a digital cordless communication system using a TDMA system, which synchronizes with a main unit of a digital cordless system in order to synchronize radio channel frames between radio base stations. A frame synchronization pulse generator for the interface unit is provided in the signal generator and the wireless base station connecting unit, so that all wireless base stations can extract synchronization information required for wireless channel frame synchronization at the same timing.

Further, the invention according to claim 2 of the present invention provides:
In a digital cordless communication system using the TDMA system, a wireless base station that transmits a wireless signal, extracts a synchronization signal based on data from the digital cordless system main device, and establishes a wireless channel frame synchronization of each wireless base station. It has the effect of transmitting a wireless channel signal so that it can be taken.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

FIG. 1 shows a first embodiment of the present invention. Reference numeral 10 denotes a main unit of the digital cordless communication system of the present invention, 101 denotes a communication path switch for switching connection of a communication path connected to an office line connection unit or a wireless base station connection unit, and 102a and 102b connect to public lines. .. 103n are wireless base station connecting sections having interfaces for connecting wireless base stations, 104a and 104b.
.. 104n are radio base stations connected to the radio base station connection unit, 10n
Reference numeral 5 denotes a synchronizing signal generator for generating a signal for synchronizing the radio channels between the radio base stations 104. That is, the synchronization signal generation unit 105 generates a bit synchronization pulse and a frame synchronization pulse necessary for establishing wireless channel synchronization.

FIG. 2 is a block diagram showing the configuration of the radio base station connecting unit 103.

Reference numeral 1031 denotes a frame synchronization pulse for the interface unit which generates a frame synchronization pulse F13 for the interface unit from the bit synchronization pulse F11 and the frame synchronization pulse F12 supplied from the synchronization signal generation unit 105 of the main unit 10 of the digital cordless communication system. Part, 1032a, 1032b…
Reference numeral 1032d denotes an interface unit to which the wireless base stations 104a, 104b,... 104d are directly connected. As can be seen from the block diagram of FIG. 2, the configuration is such that four wireless base stations can be connected by one wireless base station connecting unit. Also, here, the radio base station uses four time slots corresponding to the number of communication channels HWY.

As described above, the frame synchronization pulse generator 1031 for the interface unit generates the frame synchronization pulse F13 for the interface unit from the bit synchronization pulse F11 and the frame synchronization pulse F12 supplied from the synchronization signal generator 105.
Occurs. The communication path H is synchronized with the generation timing of the interface section frame synchronization pulse F13.
The timing of the WY time slot can also be changed. FIG.
9 shows the timing relationship among the bit synchronization pulse F11, the frame synchronization pulse F12, and the frame synchronization pulse F13 for the interface unit. As can be seen from FIG. 3, the frame synchronization pulse F13 for the interface section is generated so as to always have the same phase difference with respect to the frame synchronization pulse F12. In FIG. 3, the frame synchronization pulse F12
In response to the frame sync pulse F13 for the interface section.
Is generated with a delay of T1 time.

Further, as shown in FIG. 3, the frame synchronization pulse generator 1031 for the interface unit includes a communication channel HWY.
The phases of one time slot are rearranged like HWY11 to HWY14 so as to match the phase of the frame synchronization pulse F13 for the interface unit. Thereby, the interface unit 1032
a to 1032d are supplied with in-phase frame synchronization pulses and time slots.

According to this method, regardless of the number of communication channels HWY and the number of radio channels used in the radio base stations, the frame synchronization pulses F13 for the interface sections have exactly the same phase in all the radio base station connecting sections 103a to 103n. It will be able to receive.

The interface units 1032a to 1032d have means for transmitting and receiving data to and from the radio base stations 104a to 104d by a time division multiplex method.

The line interface signal F15 shown in FIG.
Is generated from the interface section frame synchronization pulse F13, and is generated from the interface section frame synchronization pulse so that the phase becomes constant. Therefore, all the line interface signals F15 from the interface units 1032a to 1032d to the corresponding wireless base stations 104a to 104d have the same timing. The same is performed in all the radio base station connecting units 103a to 103n, and as a result, the line interface signal F supplied from the digital system cordless main unit to the radio base station is output.
15 will be the same.

FIG. 4 shows an embodiment of the radio base station according to the second aspect of the present invention. 104 is a radio base station main body, 1041 is a line interface unit for receiving a line interface signal transmitted from the digital system cordless main apparatus and transmitting from the radio base station, 1042 is a transmission radio channel for error detection. A TDMA control unit that performs coding, simple confidentiality processing, and scramble processing, and performs error detection, UW (unique wort II) detection, channel type, and the like for a reception channel. , 1044 are wireless transmission / reception units for transmitting / receiving a wireless channel. Reference numeral 1045 denotes a timing control unit.
451 is a TDM that generates a TDMA frame synchronization signal F17.
A synchronization signal generation unit.

The line interface unit 1041 extracts the frame synchronization pulse F16 in the radio base station from the line interface signal F15 transmitted from the main unit 10 of the digital cordless communication system.
The signal is supplied to the A synchronization signal generation unit 10451. In the TDMA synchronization signal generation unit 10451, the frame synchronization pulse F1 in the radio base station is used.
A TDMA frame synchronization signal F17 synchronized with 6 is generated and supplied to the radio transmission / reception unit 1044.

FIG. 5 shows the timings of the line interface signal F15, the frame synchronization pulse F16 in the radio base station, and the TDMA frame synchronization signal F17. As shown in FIG. 5, the frame synchronization pulse F16 in the radio base station is extracted with a fixed value T3 time delay from the line interface signal F15,
It is transmitted to the A synchronization signal generation unit 10451. The TDMA synchronization signal generation unit 10451 outputs the TDMA frame synchronization signal F4 after T4 time from the frame synchronization pulse F16 in the radio base station.
17 is transmitted to the wireless transmission / reception unit 1044. By transmitting the radio channel at this timing, the radio transmitting / receiving section 1044 can determine the timing of transmitting the radio channel, and can synchronize the radio channels between the other radio base stations.

[0022]

As described above, according to the present invention, the TDM
In a digital cordless communication system using the A method, a synchronization signal generation unit is provided in a main unit of the digital cordless system and a synchronization pulse generation unit for an interface unit is provided in a connection unit of a wireless base station in order to synchronize wireless channel frames between wireless base stations. Thus, there is a useful effect that synchronization information required for radio channel frame synchronization can be extracted at the same timing in all radio base stations.

In the wireless base station, a synchronization signal is extracted based on data from the main unit of the digital cordless system, and a wireless channel signal is transmitted so that wireless channel frame synchronization of each wireless base station can be achieved. Accordingly, it is possible to establish wireless channel frame synchronization of each wireless base station.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a digital cordless communication system according to the present invention.

FIG. 2 is a block diagram showing a basic configuration of a wireless base station connecting unit in the digital cordless communication system of FIG.

FIG. 3 is a timing chart showing timing relationships of signals appearing in respective main parts in the digital cordless communication system of FIG. 1 and the wireless base station connecting unit of FIG. 2;

FIG. 4 is a block diagram showing a configuration of a wireless base station in the digital cordless communication system according to the present invention.

5 is a timing chart showing a signal timing relationship in each main part in the wireless base station of FIG. 4;

FIG. 6 is a block diagram showing a configuration of a conventional technique.

7 is a timing chart showing a timing relationship of signals appearing at respective main parts in the conventional technique of FIG. 6;

[Explanation of symbols]

10… Digital cordless communication system main unit, 101…
Call path switch, 102a, 102b ... office line connection, 10
3, 103a to 103n: wireless base station connection unit, 104, 104a to 104d
... Wireless base station, 105 ... Synchronization signal generator, 1031 ... Frame synchronization pulse generator for interface section, 1032a-1
032d: Interface unit, 1041: Line interface unit, 1042: TDMA control unit, 1043: Wireless control unit,
1044… Wireless transceiver, 1045… Timing controller, 10
451: TDMA synchronization signal generation unit, F11: bit synchronization pulse, F12: frame synchronization pulse, F13: frame synchronization pulse for interface unit, F15: line interface signal, F16: synchronization pulse extracted by the wireless base station, F17: TDMA Frame synchronization signal.

Claims (2)

[Claims] In a digital cordless communication system using a TDMA system, a synchronization signal generator is provided in a digital cordless system main unit for synchronizing radio channel frames between radio base stations in the system, Each radio base station connection unit corresponding to the station is provided with a synchronization pulse generation unit for the interface unit,
The digital cordless communication system main device according to this, wherein synchronization information necessary for radio channel frame synchronization is extracted with the same timing relationship through all of the radio base stations. 2. In a digital cordless communication system using a TDMA system, the radio base station for transmitting a radio signal into the system, wherein a synchronization signal is extracted based on data from the main unit of the digital cordless system. And transmitting a radio channel signal so as to synchronize radio channel frames of the respective radio base stations.