JP2004023350A - Base station, communication method, communication program, and computer-readable recording medium recording communication program - Google Patents

Abstract

Conventionally, a time updating means 39 and a time and a synchronizing signal generating means 30 for generating a synchronizing signal based on the updated time are required, and there has been a problem that the configuration becomes complicated.
A high-precision oscillator capable of oscillating a high-precision pulse having a cycle of N times (N ≧ 1, N: an integer) of a cycle of transmitting a frame storing data, or an external high-precision pulse By using a simple configuration of using a 1 PPS (PULSE PUR SECOND) signal of the GPS receiving unit 8 to generate a high-precision pulse and performing data communication in synchronization with the high-precision pulse, a plurality of radio base station apparatuses 2 Establish high-precision synchronization between
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to synchronization between base stations when a plurality of base stations controlling a mobile communication device are adjacent to each other.
[0002]
[Prior art]
As described in JP-A-6-314997, a conventional synchronization between wireless base station apparatuses is based on a time obtained by obtaining a synchronization signal using a time transmitted from a GPS (Global Positioning System). By performing slot synchronization by using this method, synchronization has been achieved.
[0003]
FIG. 4 is a configuration diagram of a conventional radio telephone control device that realizes synchronization between the radio telephone control devices.
The radio telephone control device 100 and its internal configuration will be described with reference to FIG. Reference numeral 33 denotes a wireless control unit that performs call control between the wireless telephone control device 100 and the portable wireless handset.
Reference numeral 1 denotes an antenna for performing communication.
Reference numeral 38 denotes GPS means for receiving GPS time from GPS satellites.
Reference numeral 39 denotes a time updating unit that detects and corrects the bit information of the GPS time received by the GPS unit 38, and generates a correct current time.
Reference numeral 30 denotes a time and synchronization signal generating means for setting a time for generating a synchronization signal based on the time updated by the time updating means 39 and generating a synchronization signal based on the set time.
Reference numeral 31 denotes control data interface means for interfacing with control data.
Reference numeral 32 denotes a station line interface means for taking a station line interface.
Numeral 34 denotes control means for controlling the operation of the time updating means 39, the time and synchronization signal generating means 30, the control data interface means 31, and the office line interface means 32.
[0004]
Next, an operation in which the wireless telephone control device 100 generates a synchronization signal will be described.
The GPS means 38 obtains GPS time information once every 30 seconds and outputs the GPS time to the time updating means 39.
The time updating means 39 takes in the GPS time output from the GPS means 38 to the time updating means 39, corrects the current time, and, via the control means 34, once every 30 seconds, outputs the time and synchronization signal generated by the time and synchronization signal generating means 30. Update the time.
By the above operation, the current time of the wireless telephone control device 100 is updated.
[0005]
Next, the time and synchronization signal generation unit 30 causes the wireless control unit 33 to execute an interrupt activation once every 20 ms (millisecond) via the control unit 34.
The interrupted wireless control means 33 wirelessly transmits the interrupt synchronization signal as a slot synchronization signal.
[0006]
[Problems to be solved by the invention]
As described above, in the conventional configuration, the time updating unit 39 and the time for generating the synchronization signal based on the updated time and the synchronization signal generating unit 30 are required, and there is a problem that the configuration is complicated.
In addition, since the time signal received by the GPS means 38 is received once every 30 seconds, there is a problem that the update cycle is long and the update frequency is low.
[0007]
An object of the present invention is to realize highly accurate synchronization between base stations with a simple configuration.
[0008]
[Means for Solving the Problems]
A base station according to the present invention includes: an oscillator that generates a pulse having a cycle of N times (N ≧ 1, N: an integer) a cycle of transmitting a frame storing data;
A synchronizing signal generator for generating a synchronizing signal for correcting a timing of transmitting a frame storing data based on a pulse generated by the oscillator.
[0009]
A base station according to the present invention includes a GPS receiving unit that receives a signal transmitted from a global positioning system (GPS) as a pulse,
A synchronizing signal generator for generating a synchronizing signal for correcting a timing of transmitting a frame storing data based on the pulse received by the GPS receiver.
[0010]
A plurality of the base stations are provided,
The frame is synchronously transmitted based on the synchronization signals generated by the synchronization signal generation units of the plurality of base stations.
[0011]
The communication method according to the present invention generates a pulse having a cycle of N times (N ≧ 1, N: an integer) a cycle of transmitting a frame storing data,
A synchronizing signal for correcting a timing of transmitting a frame storing data based on the generated pulse is generated.
[0012]
A communication program according to the present invention includes a process of generating a pulse having a cycle of N times (N ≧ 1, N: an integer) a cycle of transmitting a frame storing data,
The computer is configured to execute a process of generating a synchronization signal for correcting a timing of transmitting a frame storing data based on the generated pulse.
[0013]
A computer-readable recording medium on which a communication program according to the present invention is recorded includes a process of generating a pulse having a cycle of N times (N ≧ 1, N: an integer) a cycle of transmitting a frame storing data;
A computer-readable recording medium recording a communication program for causing a computer to execute a process of generating a synchronization signal for correcting a timing of transmitting a frame storing data based on the generated pulse. It is characterized by.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described.
Embodiment 1 FIG.
FIG. 1 is a configuration diagram of the wireless base station device 2 according to the first embodiment.
In FIG. 1, the internal configuration of the wireless base station device 2 will be described.
Reference numeral 1 denotes an antenna for communicating with a moving object, 3 denotes a wireless communication unit, 4 denotes a control unit, 5 denotes a synchronization signal generation unit, 6 denotes a high-precision oscillator, 11 denotes a control data interface unit, and 14 denotes a network interface unit.
The high-precision oscillator 6 is an example of an oscillator that generates a pulse having a cycle of N times (N ≧ 1, N: an integer) a cycle of transmitting a frame storing data.
[0015]
In the present embodiment, a high-precision oscillator 6 capable of oscillating a high-precision pulse is mounted on the radio base station apparatus 2, and the high-precision oscillator 6 sends the synchronization signal generator 5 N times the radio frame period (N ≧ 1). , N: integer). An example of N is wireless superframe period / wireless frame period.
Here, the radio frame period refers to the time from when one frame storing data is transmitted wirelessly to when the next frame is transmitted. At present, the radio frame period is about 40 ms (milli-second).
Similarly, the wireless superframe period refers to the time from when one frame storing data is wirelessly transmitted to when the next frame is transmitted. Currently, the radio superframe period is about 640 ms or 960 ms.
Therefore, when the above numerical value is substituted into “radio superframe period / radio frame period” described above as an example of N,
N = wireless superframe period / wireless frame period = 640/40 = 16, or
N = wireless superframe period / wireless frame period = 960/40 = 24.
Next, the synchronization signal generation unit 5 to which the high-precision pulse generated by the high-precision oscillator 6 is input outputs a synchronization pulse to the control unit 4, and the control unit 4 outputs the synchronization pulse to the wireless communication unit 3. The transmission timing is corrected by the synchronization pulse, and data is output to the wireless communication unit 3.
[0016]
As described above, in the system for transmitting the same frequency by the plurality of radio base station apparatuses 2, the data transmission is performed on the basis of the high-precision oscillator 6 for generating a high-precision pulse N times the radio frame and the pulse from the high-precision oscillator 6. The wireless base station device 2 including the synchronization signal generation unit 5 that corrects timing has been described.
[0017]
As described above, the invention of the present embodiment realizes highly accurate synchronization between the wireless base station devices 2 with simple components. That is, by mounting the high-precision oscillator 6 on the plurality of radio base station apparatuses 2, the time updating means and the time and the synchronizing signal generating means for generating the synchronizing signal based on the updated time, which are conventionally required, become unnecessary. In addition, the transmission timing of data output from the wireless communication unit 3 of each wireless base station device 2 can be synchronized by the high precision oscillator 6.
[0018]
Embodiment 2 FIG.
FIG. 2 is a configuration diagram according to the second embodiment.
In the figure, reference numeral 8 denotes a GPS receiving unit, and the other configuration is the same as that of the first embodiment, which has already been described in the first embodiment, and is not described here.
[0019]
The second embodiment differs from the first embodiment in that the GPS receiver 8 is used as a high-precision pulse input to the synchronization signal generator 5.
A signal (1 PPS signal (PPS: PULSE PUR SECOND)) output once a second from the GPS receiving unit 8 via the GPS antenna is used as a high-precision pulse.
The operation after inputting the high-precision pulse to the synchronizing signal generation unit 5 is the same as the operation of the first embodiment, and the description is omitted.
[0020]
As described above, the radio base station apparatus 2 including the synchronization signal generation unit 5 that extracts the signal output once per second from the GPS reception unit 8 and corrects the data transmission timing based on the signal is described. did.
[0021]
As described above, also in the invention of the present embodiment, highly accurate synchronization between the wireless base station devices 2 is realized by simple components. That is, by mounting the GPS receiving unit 8 on a plurality of wireless base station devices 2, each wireless base station device 2 can simultaneously receive a high-precision 1PPS signal from GPS. 3 makes it possible to synchronize the transmission timing of the data output from the third device. Therefore, the time updating means and the time and the synchronizing signal generating means for generating the synchronizing signal based on the updated time, which are conventionally required, become unnecessary.
[0022]
As described above, in the related art, since the synchronization signal is generated based on the time at which the data is received once every 30 seconds, the cycle of correcting the data transmission timing is long and the update is slow (the update cycle is long). However, in the present embodiment, since the update cycle is short, more accurate synchronization can be performed between the plurality of wireless base station devices 2.
[0023]
FIG. 3 is a computer basic configuration diagram of the wireless base station device 2.
3, a CPU (Central Processing Unit) 40 for executing a program is connected to a monitor 41, a keyboard 42, a mouse 43, a communication board 44, a magnetic disk device 46, and the like via a bus 48.
The magnetic disk device 46 stores an OS 47, a program group 49, and a file group 50. However, an embodiment in which the program group 49 and the file group 50 are integrated to form the object-oriented program group 49 is also considered as one embodiment.
The program group 49 is executed by the CPU 40 and the OS 47.
In each of the above embodiments, communication is performed via the communication line using the function of the communication board 44.
[0024]
In all embodiments, each operation of each component is related to each other, and the operation of each component can be replaced as a series of operations while taking into account the relation of the operations described above. Then, by substituting in this way, an embodiment of the method invention can be obtained.
Further, by replacing the operation of each of the above components with the processing of each of the components, an embodiment of a program can be realized.
In addition, by storing the program in a “computer-readable recording medium on which the program is recorded”, a computer-readable recording medium recorded on the program can be realized.
[0025]
The embodiment of the program and the embodiment of the computer-readable recording medium recorded in the program can all be configured by a program that can be operated by a computer.
Each process in the embodiment of the program and the embodiment of the computer-readable recording medium on which the program is recorded is executed by the program. The program is recorded in the recording device, and is transmitted from the recording device to the central processing unit ( CPU) and each flowchart is executed by the central processing unit.
Further, the software and programs of each embodiment may be realized by firmware stored in a ROM (READ ONLY MEMORY). Alternatively, each function of the above-described program may be realized by a combination of software, firmware, and hardware.
[0026]
【The invention's effect】
As described above, according to the present invention, synchronization can be achieved between a plurality of base stations with a simple configuration.
[0027]
Further, since the update cycle is short, more accurate synchronization can be performed between a plurality of base stations.
[Brief description of the drawings]
FIG. 1 is a configuration diagram according to a first embodiment of the present invention.
FIG. 2 is a configuration diagram according to a second embodiment of the present invention.
FIG. 3 is a computer basic configuration diagram of a wireless base station device.
FIG. 4 is a configuration diagram of a wireless telephone control device according to a conventional technique.
[Explanation of symbols]
Reference Signs List 1 antenna, 2 radio base station apparatus, 3 radio communication section, 4 control section, 5 synchronization signal generation section, 6 high precision oscillator, 8 GPS reception section, 11 control data interface section, 14 network interface section, 30 time and synchronization signal Generating means, 31 control data interface means, 32 local line interface means, 33 radio control means, 34 control means, 38 GPS means, 39 time updating means, 100 radio telephone control device.

Claims (6)

An oscillator for generating a pulse having a cycle of N times (N ≧ 1, N: an integer) a cycle of transmitting a frame storing data;
A base station comprising: a synchronization signal generation unit that generates a synchronization signal for correcting a timing of transmitting a frame storing data based on a pulse generated by the oscillator. A GPS receiver that receives a signal transmitted from a global positioning system (GPS) as a pulse,
A base station comprising: a synchronization signal generation unit that generates a synchronization signal for correcting a timing of transmitting a frame storing data based on a pulse received by the GPS reception unit. A plurality of the base stations are provided,
3. The base station according to claim 1, wherein a frame is transmitted synchronously based on a synchronization signal generated by a synchronization signal generation unit of the plurality of base stations. A pulse having a cycle of N times (N ≧ 1, N: an integer) the cycle of transmitting a frame storing data is generated,
A communication method, comprising: generating a synchronization signal for correcting a timing of transmitting a frame storing data based on the generated pulse. A process of generating a pulse having a cycle of N times (N ≧ 1, N: an integer) a cycle of transmitting a frame storing data;
A communication program for causing a computer to execute a process of generating a synchronization signal for correcting a timing of transmitting a frame storing data based on the generated pulse. A process of generating a pulse having a cycle of N times (N ≧ 1, N: an integer) a cycle of transmitting a frame storing data;
A computer-readable recording medium recording a communication program for causing a computer to execute a process of generating a synchronization signal for correcting a timing of transmitting a frame storing data based on the generated pulse.

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