CN104080202A - Two-channel radio remote unit and distributed base station system used in tunnel - Google Patents
Two-channel radio remote unit and distributed base station system used in tunnel Download PDFInfo
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- CN104080202A CN104080202A CN201310103934.3A CN201310103934A CN104080202A CN 104080202 A CN104080202 A CN 104080202A CN 201310103934 A CN201310103934 A CN 201310103934A CN 104080202 A CN104080202 A CN 104080202A
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Abstract
The invention discloses a two-channel radio remote unit used in a tunnel. The two-channel radio remote unit is provided with two bidirectional directional antennas, which respectively correspond to one communication channel, and wireless signal coverage in two directions of the tunnel is respectively provided by two beam transmitting units of each bidirectional directional antenna. The invention further discloses a distributed base station system. Through applying the technical scheme disclosed by the invention, a coverage dead zone of a wireless signal in a closed space, such as an enclosure space, can be greatly reduced.
Description
Technical field
The application relates to mobile communication technology, relates in particular to a kind of binary channels Remote Radio Unit and distributed base station system for tunnel.
Background technology
Along with the arrival of information age, people are more and more higher to the requirement of radio communication, for being regarded as traditionally the tunnel-like areas such as the highway of communication blind district or railway tunnel, mine, subway, also wish that the wireless signal that can provide good covers.Therefore, flexible, reliable in quality and the wireless communication system that can adapt to complex environment become development trend from now on.Particularly along with country more and more payes attention to safety of coal mines, thus more and more higher to the communicating requirement under coal mine, be not limited only to voice and short message service, also need to support the contour data volume business of gas-monitoring, video monitoring and personnel positioning.
With traditional antenna, when the enclosure space emitting electromagnetic waves such as tunnel, in electromagnetic wave propagation process, after multiple reflections, scattering, decay is very serious, is difficult to meet the requirements of propagation distance and field intensity and covers.Therefore in these specific environments, under limited transmitting power, make as far as possible the farther problem that more evenly becomes people's first concern of Electromagnetic Wave Propagation.At TD SDMA (TD-SCDMA, Time Division-Synchronous Code Division Multiple Access) system is with its excellent performance, more and more applied at the underground communica tion in tunnel-like area communication, particularly colliery.As a kind of wireless communication system, it is the prerequisite that ensures that every business can normally be worked that the wireless signal of TD-SCDMA system covers, and this covering should be seamless, and need to promote the robustness of wireless communication system as far as possible.
Fig. 1 is the schematic diagram that the wireless signal of a kind of conventional TD-SCDMA system in prior art covers in tunnel.The method is based on binary channels Remote Radio Unit (RRU, Radio Remote Unit), in tunnel, arrange a binary channels RRU every a segment distance, each binary channels RRU has two unidirectional orientation antennas, the respectively corresponding communication port of these two unidirectional orientation antennas, adopt back-to-back mode, provide wireless signal to cover to the both direction in tunnel respectively.Arrow in Fig. 1 represents the transmit direction of unidirectional orientation antenna.
The wireless signal coverage schematic diagram that two unidirectional orientation antennas that Fig. 2 is the RRU of binary channels shown in Fig. 1 provide.As can be seen from Figure 2, there is following shortcoming in existing this wireless signal coverage mode:
Adopt the covering scheme of unidirectional orientation antenna, may make two unidirectional orientation antenna handover regions (being region shown in dotted line frame in Fig. 1) of same binary channels RRU produce the blind area that wireless signal covers; For certain user of particular moment, can only be in the covering of a unidirectional orientation antenna, and the signal that baseband processing unit (BBU, Base Band Unit) still receives binary channels RRU is processed, and has lost up diversity gain; And due to the tortuous feature of mine laneway, can make descending covering occur possible blind area.
Summary of the invention
The application provides a kind of binary channels Remote Radio Unit and distributed base station system for tunnel, can greatly reduce coverage hole.
A kind of binary channels Remote Radio Unit for tunnel that the embodiment of the present application provides, described binary channels Remote Radio Unit has two bidirectional oriented antennas, these two the respectively corresponding communication ports of bidirectional oriented antenna, two beam transmission unit of each bidirectional oriented antenna provide wireless signal to cover to the both direction in tunnel respectively.
Preferably, between two of same bidirectional oriented antenna wave beams, possesses leaky design.
Preferably, between two of same bidirectional oriented antenna beam transmission unit, connect by leaky cable.
Preferably, two bidirectional oriented antennas that same binary channels Remote Radio Unit is corresponding adopt different polarization modes.
The polarization mode of adopt respectively+45 degree of two bidirectional oriented antennas that preferably, same binary channels Remote Radio Unit is corresponding and-45 degree.
Preferably, the bidirectional oriented antenna of binary channels Remote Radio Unit is installed on tunnel top, and the transmit direction of two beam transmission unit downwards and press from both sides certain angle with tunnel direction.
Preferably, two bidirectional oriented antennas that same binary channels Remote Radio Unit is corresponding divide the both sides that are in tunnel wall.
The embodiment of the present application also provides a kind of distributed base station system for tunnel, described distributed base station system comprises baseband processing unit and binary channels Remote Radio Unit, and described binary channels Remote Radio Unit is foregoing binary channels Remote Radio Unit.
Preferably, in described distributed base station system, multiple binary channels Remote Radio Unit are connected on same baseband processing unit, and belong to same community.
As can be seen from the above technical solutions, in tunnel, arrange a binary channels RRU every a segment distance, each binary channels RRU has two bidirectional oriented antennas, these two the respectively corresponding communication ports of bidirectional oriented antenna, two beam transmission unit of each bidirectional oriented antenna provide wireless signal to cover to the both direction in tunnel respectively, thereby greatly reduce coverage hole.
Brief description of the drawings
Fig. 1 is the schematic diagram that the wireless signal of a kind of conventional TD-SCDMA system in prior art covers in tunnel;
The wireless signal coverage schematic diagram that two unidirectional orientation antennas that Fig. 2 is the RRU of binary channels shown in Fig. 1 provide;
The schematic diagram that the wireless signal based on TD-SCDMA system that Fig. 3 provides for the embodiment of the present application covers in tunnel.
Embodiment
For making know-why, feature and the technique effect of present techniques scheme clearer, below in conjunction with specific embodiment, present techniques scheme is described in detail.
The schematic diagram that the wireless signal based on TD-SCDMA system that Fig. 3 provides for the embodiment of the present application covers in tunnel.The method is equally based on binary channels RRU, in tunnel, arrange a binary channels RRU every a segment distance, each binary channels RRU has two bidirectional oriented antennas, these two the respectively corresponding communication ports of bidirectional oriented antenna, two beam transmission unit of each bidirectional oriented antenna provide wireless signal to cover to the both direction in tunnel respectively.Arrow in Fig. 1 represents the transmit direction of bidirectional oriented antenna.
If bidirectional oriented antenna has one of following feature or its combination in any, can reach better covering effect of signals:
Feature A: should do leaky design between two beam transmission unit of same bidirectional oriented antenna, be beneficial to solve the blind area that may occur between two wave beams.Described leaky design can adopt the conventional leaky cable in this area to realize the mode of electromagnetic leakage (connecting by leaky cable between two beam transmission unit of bidirectional oriented antenna), or other modes.
Feature B: two bidirectional oriented antennas that same RRU is corresponding should adopt different polarization designs, is beneficial to strengthen the robustness of system.For example, the polarization mode of adopt respectively+45 degree of these two bidirectional oriented antennas and-45 degree, due to polarization mode difference, the polarization rotation that electromagnetic wave is propagated in tunnel has randomness, thereby can bring diversity gain.
Feature C: bidirectional oriented antenna is installed on tunnel top, the transmit direction of two beam transmission unit should be completely not parallel with tunnel direction, but downwards and press from both sides certain angle with tunnel direction, be beneficial to realize better covering;
Feature D: in order better to realize diversity reception and better to realize the covering to tunnel, two bidirectional oriented antennas that same RRU is corresponding should divide the both sides that are in tunnel wall.
The binary channels RRU that the embodiment of the present application provides, forms distributed base station system jointly with BBU.In order to reduce the switching of subscriber equipment in moving process, can utilize the technology of RRU cascade, multiple RRU are connected in same BBU above, and belong to same community, so just can reduce community as far as possible and switch.Described multiple RRU can be the multiple RRU that install continuously along tunnel, can be also multiple RRU of discontinuous installation.
The foregoing is only the application's preferred embodiment; not in order to limit the application's protection range; all within the spirit and principle of present techniques scheme, any amendment of making, be equal to replacement, improvement etc., within all should being included in the scope of the application's protection.
Claims (9)
1. the binary channels Remote Radio Unit for tunnel, it is characterized in that, described binary channels Remote Radio Unit has two bidirectional oriented antennas, these two the respectively corresponding communication ports of bidirectional oriented antenna, two beam transmission unit of each bidirectional oriented antenna provide wireless signal to cover to the both direction in tunnel respectively.
2. binary channels Remote Radio Unit according to claim 1, is characterized in that, between two wave beams of same bidirectional oriented antenna, possesses leaky design.
3. binary channels Remote Radio Unit according to claim 2, is characterized in that, between two beam transmission unit of same bidirectional oriented antenna, connects by leaky cable.
4. binary channels Remote Radio Unit according to claim 1, is characterized in that, two bidirectional oriented antennas that same binary channels Remote Radio Unit is corresponding adopt different polarization modes.
5. binary channels Remote Radio Unit according to claim 4, is characterized in that, the polarization mode of adopt respectively+45 degree of two bidirectional oriented antennas that same binary channels Remote Radio Unit is corresponding and-45 degree.
6. binary channels Remote Radio Unit according to claim 1, is characterized in that, the bidirectional oriented antenna of binary channels Remote Radio Unit is installed on tunnel top, and the transmit direction of two beam transmission unit downwards and press from both sides certain angle with tunnel direction.
7. binary channels Remote Radio Unit according to claim 1, is characterized in that, two bidirectional oriented antennas that same binary channels Remote Radio Unit is corresponding divide the both sides that are in tunnel wall.
8. the distributed base station system for tunnel, described distributed base station system comprises baseband processing unit and binary channels Remote Radio Unit, it is characterized in that, described binary channels Remote Radio Unit is the binary channels Remote Radio Unit described in claim 1 to 7 any one.
9. distributed base station system according to claim 8, is characterized in that, in described distributed base station system, multiple binary channels Remote Radio Unit are connected on same baseband processing unit, and belongs to same community.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310103934.3A CN104080202A (en) | 2013-03-28 | 2013-03-28 | Two-channel radio remote unit and distributed base station system used in tunnel |
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| CN201310103934.3A CN104080202A (en) | 2013-03-28 | 2013-03-28 | Two-channel radio remote unit and distributed base station system used in tunnel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533525A (en) * | 2016-11-30 | 2017-03-22 | 北京全路通信信号研究设计院集团有限公司 | Rail transit broadband mobile communication system and method |
| CN113791383A (en) * | 2021-10-15 | 2021-12-14 | 郑州轻工业大学 | Combined double-anchor-point positioning method based on ultra-wideband ranging |
| CN114221671A (en) * | 2021-12-02 | 2022-03-22 | 西南交通大学 | Tunnel communication system and arrangement method thereof |
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| US6310705B1 (en) * | 1997-08-14 | 2001-10-30 | Samsung Electronics Co., Ltd. | Duplex outdoor base station transceiver subsystem utilizing a hybrid system of a high power amplifier and an optic antenna |
| CN102082596A (en) * | 2009-11-30 | 2011-06-01 | 中国移动通信集团江苏有限公司 | Communication method and device based on dual-channel technology |
| CN102231455A (en) * | 2010-07-27 | 2011-11-02 | 京信通信系统（中国）有限公司 | Gallery mobile communication coverage and distribution system and ultra broadband bidirectional radiating antenna |
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2013
- 2013-03-28 CN CN201310103934.3A patent/CN104080202A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6310705B1 (en) * | 1997-08-14 | 2001-10-30 | Samsung Electronics Co., Ltd. | Duplex outdoor base station transceiver subsystem utilizing a hybrid system of a high power amplifier and an optic antenna |
| CN102082596A (en) * | 2009-11-30 | 2011-06-01 | 中国移动通信集团江苏有限公司 | Communication method and device based on dual-channel technology |
| CN102231455A (en) * | 2010-07-27 | 2011-11-02 | 京信通信系统（中国）有限公司 | Gallery mobile communication coverage and distribution system and ultra broadband bidirectional radiating antenna |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533525A (en) * | 2016-11-30 | 2017-03-22 | 北京全路通信信号研究设计院集团有限公司 | Rail transit broadband mobile communication system and method |
| CN113791383A (en) * | 2021-10-15 | 2021-12-14 | 郑州轻工业大学 | Combined double-anchor-point positioning method based on ultra-wideband ranging |
| CN114221671A (en) * | 2021-12-02 | 2022-03-22 | 西南交通大学 | Tunnel communication system and arrangement method thereof |
| CN114221671B (en) * | 2021-12-02 | 2023-02-28 | 西南交通大学 | Tunnel communication system and arrangement method thereof |
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Application publication date: 20141001 |