WO2005062502A1 - 屋内移動体通信システム及びそれに用いるアンテナ配置 - Google Patents
屋内移動体通信システム及びそれに用いるアンテナ配置 Download PDFInfo
- Publication number
- WO2005062502A1 WO2005062502A1 PCT/JP2004/019685 JP2004019685W WO2005062502A1 WO 2005062502 A1 WO2005062502 A1 WO 2005062502A1 JP 2004019685 W JP2004019685 W JP 2004019685W WO 2005062502 A1 WO2005062502 A1 WO 2005062502A1
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- WO
- WIPO (PCT)
- Prior art keywords
- indoor
- mobile communication
- master unit
- base station
- antennas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
- H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas
Definitions
- the present invention relates to an indoor mobile communication system that arranges a plurality of indoor antennas connected to a base station, forms a plurality of zones indoors, and executes communication between mobile transceivers and via the base station.
- a plurality of indoor antennas connected to the base station are arranged, and a plurality of zones are formed indoors so that the mobile transceivers and the base station can communicate with each other.
- a conventional indoor mobile communication system that executes communication via a wireless communication system will be described with reference to FIG.
- indoor mobile communication is performed for indoor floors B1 and Bn of the building (B) for communication between a plurality of mobile terminals 6 existing on the floor or outside the building.
- 1 shows a system and an antenna arrangement used for the system.
- a base station device 1 is connected via an electric line to an optical transmission device (base unit) 2 provided with an electric-optical conversion device.
- the output of the optical transmission device 2 is connected to an optical transmission device (slave unit) 3-1 to 3-9 provided with an optical-electrical conversion means via an optical fiber 17.
- the optical transmission device (slave unit) is connected to indoor antennas 41 1 to 4-9 forming zones on floors B1 and Bn, respectively, to form a plurality of zones Z-1 to Z-9. ing.
- the spacing between multiple antennas in this case is about 5 to 3 Om in the past, but may vary depending on the shape of the building, the materials that make up the building, etc.
- the receiving side has been used to reduce fading in the CDMA system.
- a device that employs a path diversity system as a device function is known. (See, for example, Japanese Patent Application Laid-Open No. 5-26881 / 28)
- the base station antenna of the CDMA mobile communication is an array antenna (array antenna) using multiple antennas as shown in Fig. 6, and the interval between the antennas is such that the fluctuations in the signal strength received by each antenna are different from each other.
- the amount of delay is such that there is no correlation (or a sufficiently small correlation) (about one to several wavelengths), and the feed to these antennas has a delay difference of at least about one symbol length of the spreading code or more.
- an artificial frequency-selective fading environment is created by transmitting or receiving by adding a symbol, and short-period faging is reduced by promoting a path diversity function.
- Performing communication using a mobile terminal indoors has the following problems.
- the first problem is that communication quality is not stable due to weak radio waves from the outdoors.
- the radio waves from the outdoors are strong, but the radio waves from multiple base stations are received by the mobile terminal with the same strength, so the connection destination of the mobile terminal differs depending on the timing, and the communication quality is stable It is a high-rise floor problem of not doing it.
- An object (problem) of the present invention is to provide an indoor mobile communication system capable of performing a call with improved communication quality with a simple configuration and an antenna arrangement used therefor. Disclosure of the invention
- the gist of the present invention that solves the above problems is as follows (1) to (14).
- the base station Upon communication between a station and the indoor antenna, a different delay amount is given between adjacent indoor antennas among the indoor antennas.
- the distribution master unit provided with an electric-optical converter connected to the base station, and a plurality of slave units provided with an optical-electrical converter connected to each of the indoor antennas. And providing at least one delay means for connecting the distribution master unit and each of the slave units with an optical fiber and providing a different delay amount between the adjacent indoor antennas.
- a distribution master unit having an electric-optical converter connected to the base station, and a slave unit having an optical-electrical converter connected to each of the indoor antennas are provided,
- the distribution master unit and the slave units for each floor are connected in series by an optical fiber, and delay means for providing a different amount of delay between adjacent indoor antennas for each floor are provided between the slave units.
- the first distribution master unit for distributing each floor provided with the electrical-optical conversion means connected to the base station, and the output of the first distribution master unit are the same.
- a second distribution master provided with an optical-electrical conversion means for distributing to each of the slaves, and a plurality of slaves connected to the indoor antennas, wherein the first distribution master and the second The second distribution base unit is connected by an optical fiber, the second distribution base unit and each slave unit of each floor are connected by an electric circuit, and a different amount of delay is given between the adjacent indoor antennas. And at least one delay means.
- the electric line may be formed by a LAN cable. And features.
- one of the distribution outputs of the distribution master unit which is connected to the base station and divided into two, is electrically connected to one of the adjacent indoor antennas via amplifying means,
- the other of the distributed outputs is connected to the other of the indoor antennas adjacent to the one of the antennas via an electric circuit via an amplifying unit and a delaying unit.
- the electric circuit is formed by a coaxial cable.
- the delay means is formed of an optical fiber.
- the communication is performed by a CDMA system.
- a distribution master unit provided with an electric-optical converter connected to the base station, and a plurality of slaves provided with an optical-electrical converter connected to each of the indoor antennas
- the distribution master unit and each of the slave units are connected by an optical fiber, and at least one delay means for giving a different delay amount between the adjacent indoor antennas is provided.
- the distribution master unit provided with the electric-optical converter connected to the base station, and the slave unit provided with the optical-electric converter connected to each of the indoor antennas
- the distribution master unit and the slave unit for each floor are connected in series by an optical fiber, and a delay means for giving a different delay amount between adjacent indoor antennas for each floor is provided between the slave units. It is characterized by the following.
- a first distribution master unit for distributing each floor provided with an electric-optical converter connected to the base station, and an output of the first distribution master unit is flown.
- a second distribution master provided with an optical-electrical conversion means for distributing to each of the slaves in the main unit, and a plurality of slaves connected to the indoor antennas, wherein the first distribution master and the second The second distribution master unit is connected by an optical fiber, the second distribution master unit and each slave unit for each floor are connected by an electric circuit, and different delay amounts are given between the adjacent indoor antennas. And at least one delay means.
- noise levels such as thermal noise and interference noise can be reduced (approximately 3 dB) and communication quality can be improved, so that communication bandwidth can be compressed and indoors.
- the number of antennas arranged for zone formation can be reduced (for example, about half).
- FIG. 1 is a diagram showing a first embodiment of the present invention
- FIG. 2 is a diagram showing a second embodiment of the present invention
- FIG. 3 is a diagram showing a third embodiment of the present invention
- FIG. 4 is a diagram showing a fourth embodiment of the present invention.
- FIG. 5 is a diagram showing a configuration of a conventional indoor mobile communication system
- FIG. 6 is a diagram showing a configuration of a conventional dipersity antenna for CDMA mobile communication.
- 1 is a base station device (BTS)
- 2 is an optical transmission device (base unit)
- 2a-1 and 2a-2 are optical-Z electrical converters
- 3_1 to 3-9 are optical Transmission equipment (slave unit)
- 4-1 to 4-1 9 are antennas
- 5, 5-1 and 5-2 are delay elements (delay means)
- 6 is mobile communication terminals
- 7 is optical fiber
- 8 is LAN Cable
- 9 is a coaxial cable
- 10-1 and 10-2 are amplifying devices
- 11 is an outdoor antenna
- Z-1 to Z-9 are zones.
- the indoor floors B1 and Bn of the building (B) are used for communication between the plurality of mobile terminals 6 existing on the floor or outside the building by the CDMA method.
- 1 shows a mobile communication system and an antenna arrangement used for the mobile communication system.
- a base station device 1 is connected via an electric line to an optical transmission device (base unit) 2 provided with an electric-optical conversion device.
- the output of the optical transmission device 2 is connected to an optical transmission device (slave) 3-1 to 3-5 provided with an optical-electrical conversion means via an optical fiber 17.
- the optical transmission device (slave unit) is connected to indoor antennas 41 1 to 4-5 forming zones Z-1 to Z-5 on floors B1 and Bn, respectively.
- This zone configuration is similar to the conventional system of FIG. 5 in that communication between a plurality of mobile terminals 6 or outside the building is performed, but in this embodiment, the antenna 4 Optical transmission device (slave unit) corresponding to 2-1 and Antenna 4-1-5 (Delay unit) A configuration in which a delay element (delay means) is inserted in the circuits of 3-2 and 3-5 to provide a delay between adjacent antennas Is different.
- the delay time given by the delay means 5-1 and 5-2 needs to be sufficient if there is a time difference of l chip (260 ns) or more. It is.
- the distance to each antenna differs depending on the structure of the building, and accordingly, a delay due to wiring to each antenna occurs. Therefore, the inventors of the present application have proposed an indoor mobile communication system applied to the interior of various existing buildings. As a result of investigating the length of the wiring between the system antenna and the base station, a predetermined It was confirmed that there was a quantity (for example, l / zs).
- a predetermined delay amount for example, 1 ⁇ s
- this delay amount is obtained with a length of 20 Om in the optical fiber. Further, by forming the delay element based on the optical fiber and the optical fiber for signal transmission as an integrated delay optical fiber unit, it becomes easier to handle.
- the delay element can be realized by the following means in addition to the delay by the optical fiber described above.
- FIG. 2 a diagram is shown for indoor floors B1 and Bn of the building (B) for communication between a plurality of mobile terminals 6 existing on the floor or outside the building by the CDMA method. Like FIG. 1, an indoor mobile communication system and an antenna arrangement used therefor are shown.
- a base station device 1 is connected via an electric line to an optical transmission device (base unit) 2 having an electric-optical conversion means.
- the output of the optical transmission device 2 is connected in series to an optical transmission device (slave unit) 3-1 to 3-3 provided with an optical-electrical conversion means by one optical fiber 17, and the optical transmission device The output of 2 is connected in series by one optical fiber 17 to an optical transmission device (subunit) 3-4 to 3-5 equipped with an optical-electrical conversion means.
- the optical transmission device (slave unit) is connected to indoor antennas 41 1 to 4-5 forming zones Z-1 to Z-5 on floors B1 and Bn, respectively.
- the delay element is different from the first embodiment in that the delay element is inserted between the optical transmission devices (slaves).
- the delay time given by the delay means 5-1, 5-2 and 5-3 is l chip (260 ns)
- the above time difference is sufficient for the time being.
- FIG. 3 a diagram is used for indoor floors B1 and Bn of the building (B) for communication between the plurality of mobile terminals 6 existing on the floor or outside the building by the CDMA method. Like FIG. 1, an indoor mobile communication system and an antenna arrangement used therefor are shown.
- the base station device 1 is connected to the electrical-optical conversion means 2a-1 and 2a-2 provided for each floor, and the optical transmission device (parent device) 2 via an electrical line.
- the electrical-optical conversion means 2a-1 and 2a-2 are connected via a LAN cable 8 to optical transmission devices (slave units) 3-1 to 3-5 provided with optical-electrical conversion means, respectively. .
- the optical transmission device (slave unit) is connected to indoor antennas 41 1 to 45 that form zones Z-1 to Z_5 on floors B1 and Bn, respectively.
- This zone configuration is similar to the conventional system of FIG. 5 in that communication between a plurality of mobile terminals 6 is performed between each other or outside the building, but in the third embodiment, In addition, a delay element (delay means) is introduced into the circuit of the optical transmission device (slave unit) 3-2 and 3-4 corresponding to the antenna 4-2 and the antenna 414, and the delay between adjacent antennas is reduced. The difference is in the configuration provided.
- the delay time given by the delay means 5-1 and 5-2 needs to be sufficient if there is a time difference of l chip (260 ns) or more. It is.
- FIG. 4 the communication between the indoor floors B1 and Bn of the building (B) between the plurality of mobile terminals 6 existing on the floor or outside the building by the CDMA method is performed. Therefore, as in FIG. 1, an indoor mobile communication system and an antenna arrangement used therefor are shown.
- the base station apparatus 1 is electrically connected by coaxial cables to indoor antennas 41 1 to 41 that form zones Z-1 to Z-5 on floors Bl to Bn.
- connection is such that the delay element 5 is inserted into the adjacent one of the antennas forming the zone.
- the base station apparatus has an amplifier (booster) function, and is wirelessly connected to a communication line outside the building via an outdoor antenna 11. It may be connected to a communication line outside the building by wire.
- boost boost
- the zone configuration of FIG. 4 is similar to the system of FIGS. 1 to 3 in that communication between a plurality of mobile terminals 6 or outside the building is performed, but the fourth embodiment Is different from the systems of FIGS. 1 to 3 in that only one delay element is required regardless of the floor and no optical fiber is used.
- the delay time given by the delay means 5-1 and 5-2 needs to be sufficient if there is a time difference of l chip (260 ns) or more. It is.
- the mobile communication system according to the CDMA method is described.
- the indoor mobile communication system of the present invention and the antenna arrangement used for the same are different from the other systems. Needless to say, it can be applied to Industrial applicability
- noise levels such as thermal noise and interference noise can be reduced (approximately 3 dB) and communication quality can be improved, so that communication band can be compressed and indoors can be compressed.
- the industrial applicability is extremely large because the number of antennas arranged for zone formation can be reduced (for example, about half).
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Optical Communication System (AREA)
- Radio Transmission System (AREA)
Abstract
Description
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003-427156 | 2003-12-24 | ||
| JP2003427156A JP2005191653A (ja) | 2003-12-24 | 2003-12-24 | 屋内移動体通信システム及びそれに用いるアンテナ配置 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2005062502A1 true WO2005062502A1 (ja) | 2005-07-07 |
Family
ID=34708884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2004/019685 Ceased WO2005062502A1 (ja) | 2003-12-24 | 2004-12-22 | 屋内移動体通信システム及びそれに用いるアンテナ配置 |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2005191653A (ja) |
| WO (1) | WO2005062502A1 (ja) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6005325B1 (ja) * | 2015-10-21 | 2016-10-12 | 三菱電機株式会社 | 無線通信制御装置、無線通信装置および無線通信システム |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992010890A1 (en) * | 1990-12-07 | 1992-06-25 | Qualcomm Incorporated | Cdma microcellular telephone system and distributed antenna system therefor |
| JPH05268658A (ja) * | 1992-03-18 | 1993-10-15 | Kokusai Denshin Denwa Co Ltd <Kdd> | Cdma通信方式 |
| WO1995006365A1 (en) * | 1993-08-27 | 1995-03-02 | Qualcomm Incorporated | Dual distributed antenna system |
| JP2002094445A (ja) * | 2000-09-18 | 2002-03-29 | Toshiba Corp | 路車間無線通信システム、アンテナシステム、および車両側無線通信装置 |
-
2003
- 2003-12-24 JP JP2003427156A patent/JP2005191653A/ja active Pending
-
2004
- 2004-12-22 WO PCT/JP2004/019685 patent/WO2005062502A1/ja not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992010890A1 (en) * | 1990-12-07 | 1992-06-25 | Qualcomm Incorporated | Cdma microcellular telephone system and distributed antenna system therefor |
| JPH05268658A (ja) * | 1992-03-18 | 1993-10-15 | Kokusai Denshin Denwa Co Ltd <Kdd> | Cdma通信方式 |
| WO1995006365A1 (en) * | 1993-08-27 | 1995-03-02 | Qualcomm Incorporated | Dual distributed antenna system |
| JP2002094445A (ja) * | 2000-09-18 | 2002-03-29 | Toshiba Corp | 路車間無線通信システム、アンテナシステム、および車両側無線通信装置 |
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| Publication number | Publication date |
|---|---|
| JP2005191653A (ja) | 2005-07-14 |
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