WO2005079089A1 - 無線通信基地局装置 - Google Patents
無線通信基地局装置 Download PDFInfo
- Publication number
- WO2005079089A1 WO2005079089A1 PCT/JP2004/001642 JP2004001642W WO2005079089A1 WO 2005079089 A1 WO2005079089 A1 WO 2005079089A1 JP 2004001642 W JP2004001642 W JP 2004001642W WO 2005079089 A1 WO2005079089 A1 WO 2005079089A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- base station
- wireless communication
- communication base
- wireless
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/002—Mutual synchronization
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/20—Interfaces between hierarchically similar devices between access points
Definitions
- the present invention relates to a wireless communication base station apparatus of a wireless communication system in which a service area includes a plurality of wireless areas, and in particular, synchronizes a wireless communication base station apparatus covering a wireless area with an adjacent wireless communication base station.
- the present invention relates to a wireless communication base station device established based on a wireless signal received from a device or the like.
- a service area includes a plurality of radio areas
- clock synchronization control is performed between the wireless communication base station devices.
- this control method for example, there is a slave synchronization method in which each wireless communication base station device has a master-slave configuration, and a highly stable clock generated by a higher-level device (mass station) is distributed to each lower-level device (slave).
- a high-stable main oscillator is installed in the higher-level device, and the clock synchronization signal generated by the main oscillator of the higher-level device is transmitted to each lower-level device via a transmission line such as a metallic circuit or a carrier wave line.
- a transmission line such as a metallic circuit or a carrier wave line.
- Send to Each lower-level device can generate a highly stable reference signal by synchronizing with the clock of the synchronization signal received from the higher-level device via the transmission line and generate a highly stable transmission / reception signal.
- Japanese Patent Application Laid-Open No. 6-29914 discloses that even if an error occurs in the clock of the wireless communication base station device in the middle of the synchronization signal distribution system in the slave synchronization system, there is a problem in the synchronization adjustment of the lower device. Techniques for preventing this have been proposed. For example, if it is determined from the detection result of the phase difference between the higher-level device and the lower-level device that there is an abnormality in the clock from the higher-level device, control is performed so as to follow the synchronization signal of the adjacent wireless communication base station device. If it is determined that the clock of the lower-level device is abnormal, control is performed so as to follow the synchronization signal of the higher-level device.
- the base station when transmitting a stable clock synchronization signal from a higher-level apparatus to a lower-level apparatus, the base station distributes a clock between the wireless communication base station apparatuses. Need to be provided.
- a highly stable clock source is installed in the equipment for synchronization control between wireless communication base station equipment for which a transmission path for clock distribution cannot be provided due to the use of the equipment and the installation environment.
- a highly stable reference signal for realizing a frequency deviation of 0.05 ppm or less with respect to the frequency to be transmitted is required, a high-precision An oscillator is required as a clock source.
- the present invention has been made to solve the above-described problems, and is intended for a case where a transmission line for distribution of a mouth cannot be provided between a higher-level device and a higher-level device.
- Another object of the present invention is to provide a wireless communication base station apparatus that can establish synchronization between wireless communication base station apparatuses without installing a highly stable clock source in the apparatus. Disclosure of the invention
- a wireless communication base station apparatus includes: a receiving unit that receives a wireless signal having a fixed communication timing; and a synchronous carrier that reproduces a synchronous carrier synchronized with the communication and the communication timing from the wireless signal received by the receiving unit.
- a reproduction unit includes: and a frequency generation unit that generates a reference signal for wireless communication from the synchronous carrier.
- FIG. 1 is a diagram showing a configuration of a mobile communication system according to Embodiment 1 of the present invention.
- FIG. 2 is a block diagram showing a configuration of the wireless communication base station device in FIG.
- FIG. 3 is a diagram showing a configuration of a mobile communication system according to Embodiment 2 of the present invention.
- FIG. 4 is a block diagram showing a configuration of the wireless communication base station device in FIG.
- FIG. 5 is a block diagram showing the configuration of the reference transmitter in FIG.
- FIG. 6 is a diagram showing a configuration of a mobile communication system according to Embodiment 3 of the present invention.
- FIG. 1 is a diagram showing a configuration of a mobile communication system according to Embodiment 1 of the present invention, and schematically shows a network configuration using a wireless communication base station device according to Embodiment 1.
- the wireless communication base station devices l a, l b, and 1 c are connected to the communication network 2 via an exchange (not shown).
- the wireless base station control device 3 is connected to the communication network 2 via an exchange (not shown), and controls wireless communication by the wireless communication base station devices la, lb, and 1c.
- the radio base station controller 3 transmits and receives signals to and from the mobile communication terminals 4a, 4b, and 4c via the radio communication base station devices 1a, 1b, and 1c.
- FIG. 2 is a block diagram showing the configuration of the wireless communication base station device in the first HI, and receives and synchronizes a wireless signal from an adjacent wireless communication base station device 1b. a (or the wireless communication base station device 1c).
- the wireless communication base station device la (or device 1c) includes an antenna 5a for receiving a downlink transmission signal from the adjacent wireless communication base station device 1b to the mobile communication terminals 4b and 4c. Is provided.
- the signal received from the antenna 5a is amplified by the receiving unit 6 in the wireless communication base station device 1a.
- the synchronous carrier reproducing unit 7 reproduces a synchronous carrier from the received signal amplified by the receiving unit 6, and uses the frequency generating unit as a reference signal (reference phase signal) necessary for transmitting and receiving signals in the transmitting unit 9 and the receiving unit 10. Output to 8.
- the frequency generator 8 uses the reference signal from the synchronous carrier reproducer 7 to convert the frequency of the signal transmitted and received by the transmitter 9 and the receiver 10.
- the transmitting unit 9 and the receiving unit 10 transmit and receive a radio signal to and from a mobile communication terminal belonging to a radio channel covered by the own device la (or device lc) via the antennas 5b and 5c.
- the adjacent wireless communication base station device 1b transmits a highly stable wireless signal determined by the Radio Law or the like.
- a highly stable main oscillator is installed in the radio base station controller 3 which is a higher-level device of the radio communication base station 1b.
- the wireless communication base station device 1b receives the clock synchronization signal generated by the main oscillator of the wireless base station control device 3 via the transmission path. Thereby, the wireless communication base station device 1b can generate a highly stable wireless signal based on the reference signal generated in synchronization with the clock of the synchronization signal.
- the wireless signal is transmitted from the wireless communication base station device 1b as a downlink transmission signal to the mobile communication terminals 4b and 4c, for example.
- a highly stable clock source for example, a constant temperature compensation type crystal is provided in the radio communication base station device 1b. Provide an oscillator. This clock source generates a highly stable radio signal and transmits it as a downlink transmission signal to mobile communication terminals 4b and 4c.
- highly stable indicates that the stability of the transmission frequency of the radio signal is high, and is determined by the magnitude of the frequency deviation with respect to the frequency to be transmitted.
- “highly stable” in the present invention means that the frequency deviation from the desired transmission frequency is small.
- a frequency deviation of 0.05 ppm or less is defined as high stability.
- the wireless communication base station device 1b adjacent to the wireless communication base station devices 1a and 1c transmits and receives control signals for communicating with the mobile communication terminals (cellular phones) 4b and 4c, and communication with these. Individual signals such as audio data and digital data The radio signal modulated by the signal is always transmitted.
- signals in a wireless section are transmitted by a time division multiplexing method.
- the control signal is transmitted only in a preset time division section.
- the control signal is continuously and repeatedly transmitted to the mobile communication terminal, which is a mobile phone, in the specific time division section. This corresponds to the operation of “always transmitting” by the wireless communication base station device 1b described above.
- the wireless signal from the wireless communication base station device 1b is a highly stable wireless signal determined by the Radio Law as described above.
- This radio signal may be generated based on a synchronization signal of a clock generated by a highly stable main oscillator installed in the radio base station controller 3, or based on a signal from a clock source mounted on the own device 1b. May be generated.
- the wireless transmission signal from the device 1b is received by the antenna 5a.
- the received radio signal is amplified to a desired level by the receiving unit 6 and output to the synchronous carrier recovery unit 7.
- the synchronous carrier reproducing unit 7 reproduces a synchronous carrier synchronized with the clock of the device 1b from the received signal.
- existing synchronous carrier recovery technology can be used.
- phase modulation is removed from the received signal, and furthermore, noise and distortion generated at the time of reception are removed together with the true signal.
- a carrier component is extracted and separated from the received signal, which is a modulated signal. .
- the carrier signal reproduced in this way is a highly stable reference signal synchronized with a transmission signal from the adjacent wireless communication base station device 1b.
- the synchronous carrier reproduced by the synchronous carrier reproducing unit 7 is output to the frequency generating unit 8 so as to be used as a reference signal in the own device.
- the synchronous carrier reproduced by the synchronous carrier reproducer 7 is By generating signals necessary for the operations of the transmitting unit 9 and the receiving unit 10 based on the above, it is possible to obtain highly stable transmission / reception signals required for the wireless communication base station device.
- the frequency generator 8 converts the signal amplitude of the voice to be transmitted to the mobile communication terminal into a frequency deviation of the synchronous carrier and outputs the signal to the transmitter 9. Specifically, it modulates a loud sound by shifting it to a high frequency and a loud sound to a low frequency.
- the transmitting unit 9 transmits the signal as a wireless signal to the mobile communication terminal via the antenna 5b.
- the frequency generation unit 8 extracts a signal to be a reference for demodulation from a signal component (carrier or bit timing) of a radio signal received by the reception unit 10 from the mobile communication terminal via the antenna 5c. Then, by comparing this with the carrier component reproduced by the synchronous carrier reproduction section, the data is determined and reproduced.
- the wireless communication base station apparatuses 1a and 1c generate the reference signal based on the highly stable synchronization signal from the wireless communication base station apparatus 1b, so that they are synchronized with each other at the same time.
- Wireless signals can be transmitted and received between mobile communication terminals.
- the wireless communication base station device of the digital mobile phone system in which a mobile communication network is configured from a plurality of wireless areas transmits a wireless signal of a fixed communication timing.
- a receiving unit 6 for receiving, a synchronous carrier reproducing unit 7 for reproducing a synchronous carrier synchronized with the communication timing from the radio signal received by the receiving unit 6, and a frequency generating unit for generating a reference signal for wireless communication from the synchronous carrier Therefore, even if it is not possible to provide a transmission line for distribution of the uplink to the higher-level equipment, a highly stable clock source cannot be installed Synchronization can be established.
- the wireless communication for transmitting a highly stable wireless signal is performed.
- a case has been described as an example where radio communication base station apparatuses la and 1c that receive this radio signal and generate a reference signal are arranged around base station apparatus 1b.
- radio communication base station apparatuses la and 1c that receive this radio signal and generate a reference signal are arranged around base station apparatus 1b.
- a plurality of wireless communication base station apparatuses that transmit highly stable wireless signals are arranged around a wireless communication base station apparatus that receives a wireless signal and generates a reference signal, It is necessary to determine whether a reference signal should be generated using the radio signal of this type.
- the wireless communication base station apparatus may be configured to select, for example, a signal having the highest signal level of the received wireless signal as the wireless signal for generating the reference signal.
- the control signal transmitted to communicate with the mobile communication terminal includes a signal for identifying the wireless communication base station apparatus of the transmission source. The identification signal may be used to select a wireless communication base station device that transmits a wireless signal for generating a reference signal.
- the first embodiment has described an example in which the reference signal is generated from the downlink transmission signal from the adjacent wireless communication base station device 1b.
- the reference signal is generated from the downlink transmission signal from the adjacent wireless communication base station device 1b.
- a plurality of wireless communication base station devices are installed indoors such as in a building, it is not possible to receive a downlink transmission signal from a wireless communication base station device adjacent to the outside to a mobile communication terminal.
- a reference signal 11 that can transmit a radio signal for generating a reference signal and can be configured more compactly than a radio communication base station apparatus is provided.
- FIG. 3 is a diagram showing a configuration of a mobile communication system according to Embodiment 2 of the present invention, and schematically shows a network configuration using a wireless communication base station device according to Embodiment 2.
- the wireless communication base station The devices 1a and 1A receive the radio signal from the reference transmitter 11 and establish synchronization with each other based on the received signal.
- the same components as those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.
- FIG. 4 is a block diagram showing a configuration of the wireless communication base station device in FIG.
- the radio communication base station device 1A (or 1a) is provided with an antenna 5a for receiving a transmission signal from the reference transmitter 11 as shown in the figure.
- the signal received from the antenna 5a is amplified by the receiving unit 6a in the wireless communication base station device 1A (or 1a).
- the synchronous carrier recovery unit 7a reproduces the synchronous carrier from the received signal amplified by the receiving unit 6a, and outputs it to the frequency generating unit 8 as a reference signal required when transmitting and receiving signals in the transmitting unit 9 and the receiving unit 10. I do. Note that the same components as those in FIG. 2 are denoted by the same reference numerals, and redundant description will be omitted.
- FIG. 5 is a block diagram showing the configuration of the reference transmitter in FIG.
- the reference transmitter 11 is provided with a constant temperature compensated crystal oscillator 12 which is a highly stable clock source.
- a radio signal is generated by a highly stable clock generated by the crystal oscillator 12 and transmitted to the radio communication base station devices 1A and la.
- the frequency generator 8 outputs the modulated signal converted to a signal of a desired frequency by the highly stable clock generated by the crystal oscillator 12 to the transmitter 9.
- the transmitting section 9 transmits the modulated signal as a radio signal to the radio communication base station apparatuses 1A and 1a via the antenna 5d.
- the reference transmitter 11 does not have a configuration for performing wireless communication with the mobile communication terminal, and can be configured to be compact from the wireless communication base station devices 1A and 1a. In other words, the reference transmitter 11 generates a radio signal used by the radio communication base station devices 1A and la to synchronize with each other and perform radio communication with the mobile communication terminal at this timing. It consists only of a configuration for transmission. Next, the operation will be described.
- the reference transmitter 11 adjacent to the wireless communication base station apparatus la, 1A transmits a wireless signal synchronized with the clock from the internal crystal oscillator 12.
- the radio signal from the reference transmitter 11 is a highly stable radio signal with a small frequency deviation determined by the Radio Law or the like.
- the wireless transmission signal from the reference transmitter 11 is received by the antenna 5a.
- the received radio signal is amplified to a desired level by the receiving unit 6a and output to the synchronous carrier recovery unit 7a.
- synchronous carrier reproducing section 7a a synchronous carrier synchronized with the clock of the reference transmitter 11 is reproduced from the received signal.
- the reproduced carrier signal is a highly stable reference signal synchronized with the transmission signal from the reference transmitter 11.
- the synchronous carrier reproduced by the synchronous carrier reproducing unit 7a is output to the frequency generating unit 8 so as to be used as a reference signal in the own device.
- the frequency generation unit 8 generates necessary signals in the transmission unit 9 and the reception unit 10 based on the synchronous carrier reproduced by the synchronous carrier reproduction unit 7a, so that the radio communication base station device is required. Highly stable transmission / reception signals can be obtained.
- the frequency generation unit 8 converts the signal amplitude of the voice to be transmitted to the mobile communication terminal into a frequency deviation of the synchronous carrier and outputs the signal to the transmission unit 9. Specifically, it modulates a loud sound by shifting (shifting) a loud sound to a high frequency and a loud sound to a low frequency.
- the transmitting unit 9 transmits the above signal as a wireless signal to the mobile communication terminal via the antenna 5b.
- the frequency generation unit 8 generates a signal component (a carrier wave or a bit signal) of a radio signal received by the reception unit 10 from the mobile communication terminal via the antenna 5c. ), A signal serving as a reference for demodulation is extracted, and this is compared with the carrier component reproduced by the synchronous carrier reproduction unit 7 to determine and reproduce data.
- a signal component a carrier wave or a bit signal
- the wireless communication base station apparatuses 1a and 1A generate a reference signal based on the highly stable synchronization signal from the reference transmitter 11 and thereby establish synchronization between the mobile communication terminal and the mobile communication terminal. Can transmit and receive wireless signals.
- Embodiment 3 As described above, according to the second embodiment, even when a plurality of wireless communication base station apparatuses are installed indoors such as a building, they can be compactly configured and installed indoors. By providing such a reference transmitter 11, it is possible to obtain the same effects as in the first embodiment.
- a mobile object is appropriately switched between a generation path of a reference signal from a radio signal as described in the first embodiment and a generation path of a reference signal by a synchronization signal from a transmission line of a wired line. It performs wireless communication with communication terminals.
- FIG. 6 is a diagram showing a configuration of a mobile communication system according to Embodiment 3 of the present invention, and schematically shows a network configuration using a wireless communication base station device according to Embodiment 3.
- the radio communication base station apparatus 1B is different from the configuration shown in FIG. 2 in that the radio communication base station apparatus 1B includes a clock extraction unit 13 and a clock disconnection detection switching unit 14.
- the clock extracting unit 13 receives a highly stable clock synchronization signal transmitted from the radio base station control device 3 connected via a transmission line of a wired line, and extracts a clock signal.
- the cut-off detection / switching unit 14 detects the presence or absence of a clock synchronization signal from the radio base station controller 3 via the transmission path, and responds to the detection result. To switch between the clock synchronization signal (wireless signal) from the adjacent wireless communication base station device 1b and the wireless signal from the transmission line of the wired line. Note that the same components as those in FIG. 2 are denoted by the same reference numerals, and redundant description will be omitted.
- the wireless communication base station device 1 b adjacent to the wireless communication base station device 1 B includes control signals for communicating with mobile communication terminals (mobile phones), voice data and digital data transmitted and received in communication with these devices, and the like.
- the radio signal modulated by the individual signal is always transmitted.
- the signal in the wireless section is transmitted by the time division multiplexing method, and the control signal is continuously repeated to the mobile communication terminal in the section. Sent. This corresponds to the above described operation of “always transmitting” by the wireless communication base station device 1b.
- the wireless signal from the wireless communication base station device 1b is a highly stable wireless signal determined by the Radio Law or the like.
- This radio signal may be generated based on a synchronization signal of a clock generated by a highly stable main oscillator installed in the radio base station controller 3, and may be generated from a clock source mounted on the own device lb. It may be generated based on a signal.
- the radio signal from the apparatus 1b is always received by the antenna 5a, and the synchronous carrier is reproduced by the synchronous carrier reproducing section 7 'as in the first embodiment.
- This synchronous carrier is output to the clock disconnection detection / switching unit 14.
- the clock extracting unit 13 is capable of receiving a highly stable clock synchronization signal transmitted from the radio base station controller 3 via a transmission line of a wired line. If it is under the boundary, the clock synchronization signal is received and the clock signal is extracted. This clock signal is also output to the clock disconnection detection / switching unit 14.
- the cutoff detection Z switching unit 14 is interposed in the path for inputting the output signals from the synchronous carrier recovery unit 7 and the clock extraction unit 13 to the frequency generation unit 8, and the clock extraction unit 13 If a clock signal has been output from, this is output to the frequency generator 8.
- the frequency generation unit 8 generates necessary signals in the transmission unit 9 and the reception unit 10 based on the clock signal from the clock extraction unit 13, so that a highly stable transmission / reception signal required as a wireless communication base station device is obtained.
- the frequency generator 8 generates a carrier based on the clock signal as a signal to be transmitted to the mobile communication terminal, modulates the carrier, converts the carrier into a signal of a desired frequency, and outputs the signal to the transmitter 9. I do.
- the transmitting section 9 transmits the modulated signal as a wireless signal to the mobile communication terminal via the antenna 5b. Further, the frequency generation unit 8 demodulates the radio signal received by the reception unit 10 from the mobile communication terminal via the antenna 5c using the carrier component generated based on the clock signal.
- the clock loss detection switching unit 14 outputs the synchronous carrier from the synchronous carrier recovery unit ⁇ . Output to frequency generator 8.
- frequency generating section 8 generates signals necessary for signal transmission and reception in transmitting section 9 and receiving section 10 based on the synchronous carrier from synchronous carrier reproducing section 7 in the same manner as in the first embodiment. I do.
- the path is switched to the reference signal generation path based on the wireless signal transmitted by the device 1b.
- a highly stable transmission / reception signal required as a wireless communication base station device can be obtained.
- the wireless communication base station apparatus is applicable to a digital mobile phone system that constitutes a digital integrated network that requires synchronization between the wireless communication base station apparatuses. .
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/001642 WO2005079089A1 (ja) | 2004-02-16 | 2004-02-16 | 無線通信基地局装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/001642 WO2005079089A1 (ja) | 2004-02-16 | 2004-02-16 | 無線通信基地局装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005079089A1 true WO2005079089A1 (ja) | 2005-08-25 |
Family
ID=34857538
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/001642 WO2005079089A1 (ja) | 2004-02-16 | 2004-02-16 | 無線通信基地局装置 |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2005079089A1 (ja) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02248137A (ja) * | 1989-03-22 | 1990-10-03 | Oki Electric Ind Co Ltd | 無線通信装置 |
JPH06318963A (ja) * | 1993-05-07 | 1994-11-15 | N T T Idou Tsuushinmou Kk | 移動無線機 |
JPH08289359A (ja) * | 1995-04-17 | 1996-11-01 | Toshiba Corp | 移動通信システムの基地局間フレーム同期方式およびこの方式を適用した基地局装置 |
JPH10327458A (ja) * | 1997-05-27 | 1998-12-08 | Saitama Nippon Denki Kk | 移動通信基地局のフレーム同期方法 |
JPH11127476A (ja) * | 1997-10-24 | 1999-05-11 | Kobe Steel Ltd | 無線通信システム |
JP2000357988A (ja) * | 1999-06-16 | 2000-12-26 | Nec Corp | 基地局間同期方法とその基地局間同期装置 |
JP2001268626A (ja) * | 2000-03-16 | 2001-09-28 | Matsushita Electric Ind Co Ltd | 無線基地局及びこれに接続される無線移動局、及びこれらを使用する無線通信システム及び無線通信方法 |
JP2003087175A (ja) * | 2001-09-10 | 2003-03-20 | Hitachi Kokusai Electric Inc | メッシュ型無線局通信システム |
-
2004
- 2004-02-16 WO PCT/JP2004/001642 patent/WO2005079089A1/ja active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02248137A (ja) * | 1989-03-22 | 1990-10-03 | Oki Electric Ind Co Ltd | 無線通信装置 |
JPH06318963A (ja) * | 1993-05-07 | 1994-11-15 | N T T Idou Tsuushinmou Kk | 移動無線機 |
JPH08289359A (ja) * | 1995-04-17 | 1996-11-01 | Toshiba Corp | 移動通信システムの基地局間フレーム同期方式およびこの方式を適用した基地局装置 |
JPH10327458A (ja) * | 1997-05-27 | 1998-12-08 | Saitama Nippon Denki Kk | 移動通信基地局のフレーム同期方法 |
JPH11127476A (ja) * | 1997-10-24 | 1999-05-11 | Kobe Steel Ltd | 無線通信システム |
JP2000357988A (ja) * | 1999-06-16 | 2000-12-26 | Nec Corp | 基地局間同期方法とその基地局間同期装置 |
JP2001268626A (ja) * | 2000-03-16 | 2001-09-28 | Matsushita Electric Ind Co Ltd | 無線基地局及びこれに接続される無線移動局、及びこれらを使用する無線通信システム及び無線通信方法 |
JP2003087175A (ja) * | 2001-09-10 | 2003-03-20 | Hitachi Kokusai Electric Inc | メッシュ型無線局通信システム |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8693342B2 (en) | Distributed antenna system using time division duplexing scheme | |
US9246557B2 (en) | Multiple data services over a distributed antenna system | |
KR100945969B1 (ko) | 무선 네트워크 접속성을 위한 방법 및 장치 | |
JP2002111571A (ja) | 無線中継器 | |
KR19990077650A (ko) | 멀티모드무선전송시스템 | |
CN104852757A (zh) | 用于mimo信号的分布式天线系统 | |
JPH03198439A (ja) | 狭帯域変調uhf/マイクロ波通信システム | |
KR100429550B1 (ko) | 분산무선시스템에서의 기지국 동기화 장치 및 방법 | |
JP2809179B2 (ja) | 無線同報通信システム | |
JP5821587B2 (ja) | 無線装置、無線制御装置、および同期確立方法 | |
KR20090056961A (ko) | 무선링크 특히 이동전화 네트워크의 2개의 전자장치 동기화방법 및 상기 방법을 구현하기 위한 시스템 | |
JP2009049591A (ja) | 移動体通信システム | |
KR100965192B1 (ko) | 여러 무선 단말기들을 위한 빠른 타이밍 포착 | |
WO2005079089A1 (ja) | 無線通信基地局装置 | |
JP2000278746A (ja) | 通信システム | |
WO2016098272A1 (ja) | 基地局装置及びその制御方法 | |
JPH11331121A (ja) | マルチキャリア無線伝送システム | |
WO2008012865A1 (fr) | dispositif de station parent, dispositif de station enfant et système de transmission de signaux optiques | |
EP3516827B1 (en) | Modem transmission frequency range extension | |
JP2003324412A (ja) | 無線アクセスシステム、及び無線機 | |
JP2005323076A (ja) | Cdma移動通信システム | |
JP2011049727A (ja) | 無線装置 | |
CN112242853B (zh) | 数据通信方法及装置 | |
JPS6341251B2 (ja) | ||
JP2003169368A (ja) | W−cdmaディジタル携帯電話システム |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWW | Wipo information: withdrawn in national office |
Country of ref document: DE |
|
122 | Ep: pct application non-entry in european phase | ||
NENP | Non-entry into the national phase |
Ref country code: JP |