CN102075955A - Networking system for indoor coverage of time division duplex synchronous system - Google Patents
Networking system for indoor coverage of time division duplex synchronous system Download PDFInfo
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- CN102075955A CN102075955A CN2009102241355A CN200910224135A CN102075955A CN 102075955 A CN102075955 A CN 102075955A CN 2009102241355 A CN2009102241355 A CN 2009102241355A CN 200910224135 A CN200910224135 A CN 200910224135A CN 102075955 A CN102075955 A CN 102075955A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
- H04W16/20—Network planning tools for indoor coverage or short range network deployment
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Abstract
The invention discloses a networking system for indoor coverage of a time division duplex (TDD) synchronous system. The networking system comprises a baseband unit (BBU), a plurality of radio-frequency remote units (RRUs) and a plurality of ceiling antennas, wherein the BBU is connected with the RRUs through fiber interfaces; each RRU is provided with two independent channels; each independent channel at least comprises a digital intermediate frequency unit, a transceiver, a power amplifier/a low-noise amplifier and a filter connected in turn; and each independent channel is separately connected with the plurality of ceiling antennas. By introducing double channels for indoor subarea coverage, the interference of an outdoor base station to indoor users is reduced, and the indoor system capacity is improved; and the networking system is particularly suitable to be applied in large supermarkets, convention centers or stadiums.
Description
Technical field
The present invention relates to the base station sub-system technology of time division duplex synchro system in the radio communication, relate in particular to a kind of group network system that is used for the indoor covering of time division duplex synchro system.
Background technology
Building in the modern city is more and more intensive, how based on the armored concrete material, enclosed furring in addition again can be subjected to very big decay during signal of telecommunication transmission in the radio communication, only depend on macro base station to cover, be difficult in such building and communicate by letter normally.
Medium-sized or building particularly for some, as large supermarket, large-scale conference and exhibition center, stadiums, usually at dense city, the base station is intensive, can be subjected to adjacent base station direct projection, base station, a distant place pass through the interference that refraction, scattering, diffraction pass over, seriously disturb indoor communications.Influence the speech quality and the capacity of indoor communications.Along with the development of mobile communication, operators are all meticulously building the elaboration network of oneself, and for the time division duplex synchronizing network, the solution of indoor covering is a difficult point always.
Be to solve the indoor covering problem of time division duplex synchronizing network, commonly used at present is to adopt indoor covering system, adopts the frequency range that is different from outdoor base station, one of indoor formation independently covering system avoid being subjected to the pollution of outdoor signal.
The at present common a kind of scheme that solves medium-and-large-sized venue covering of industry is generally macrocellular or microcellulor is added with the source distribution system, this scheme has solved the covering of venue open area and more indoor complex areas well, but need dried put more, indoor radiation is bigger, and it is higher that antenna need set up, and can't use in some scene.And, can be restricted for single sub-district its capacity of indoor covering because TD-SCDMA is the code channel constrained system.
Current another method in addition, as: BBU adds the mode of a plurality of RHUB, thisly solved the high building covering well, but need a large amount of RRU, if be used in the few big indoor covering of telephone traffic of the numbers of plies such as large supermarket, conference and exhibition center or stadiums, because do not have the floor in the high building to isolate, the sub-district internal interference seriously can cause the rapid decline of capacity, can not satisfy networking requirement.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of group network system that is used for the indoor covering of time division duplex synchro system, to overcome the interference of outdoor base station to indoor user, improves the indoor heating system capacity.
In order to address the above problem, the invention provides a kind of group network system that is used for the indoor covering of time division duplex synchro system, comprise a Base Band Unit BBU, a plurality of RF far-end module RRU, and a plurality of ceiling mount antennas, wherein, link to each other by optical fiber interface between described BBU and the RRU, each RRU has two autonomous channels, each autonomous channel all comprises digital intermediate frequency unit, transceiver, power amplifier/low noise amplifier and the filter that connects successively at least, and each autonomous channel also connects several ceiling mount antennas separately.
Further, said system can comprise that also described BBU comprises GPS receiver module, master control/clock unit and the baseband processing module that connects successively at least.
Further, said system can comprise that also described BBU further comprises merge cells, is used for when up reception, the signal of two autonomous channels that will receive by described optical fiber interface, described RRU merges, and then carries out Base-Band Processing by described baseband processing module.
Further, said system can comprise that also described merge cells is to adopt equal gain combining, selecting type to merge or the high specific merging according to the signal of two autonomous channels of described RRU is strong and weak.
Further, said system can comprise that also described BBU further comprises selected cell, is used for when downlink, selects an optimal channel as the downlink passage in two autonomous channels of described RRU.
Further, said system can comprise that also described selected cell is to select optimal channel according to the up received power size of two autonomous channels of described RRU.
Further, said system can comprise that also the ceiling mount antenna under described two autonomous channels is placed apart, and is evenly to distribute.
Further, said system also can comprise, distance placed apart is greater than 10 times of transmission wavelength between the ceiling mount antenna under described two autonomous channels.
Further, said system can comprise that also described each RRU is an indoor cell; Cover by binary channels in the sub-district; The frequency of indoor identical networking is different with outdoor base station.
Further, said system can comprise that also the mode that described group network system adopts subregion to cover is carried out with covering frequently indoor;
The sub-district number that adopts subregion to cover is relevant with the venue area, and the sub-district distributes and relies on the beehive net structure, the mode that the minizone adopts multi-plot joint to detect.
Compared with prior art, the present invention covers the indoor subregion that carries out by introducing binary channels, has reduced the interference of outdoor base station to indoor user, has improved the indoor heating system capacity, is particularly suitable for the application of large supermarket, conference and exhibition center or stadiums.
Description of drawings
Fig. 1 is according to the described indoor covering system networking structure of embodiment of the invention schematic diagram;
Fig. 2 is according to the described cell topology of the embodiment of the invention;
Fig. 3 is according to the described ceiling mount antenna position view of the embodiment of the invention.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the group network system scheme that the present invention proposes is finished indoor covering by the mode of BBU+RRU, the structure of BBU and RRU and being connected as shown in Figure 1, and the two connects by optical fiber, to reduce a large amount of feeder lines that may occur, system of the present invention comprises following components at least:
Base Band Unit BBU comprises GPS receiver module, master control/clock unit, baseband processing module and optical fiber interface several sections at least in the structure of BBU;
RF far-end module RRU, RF far-end module comprise digital intermediate frequency unit, transceiver, power amplifier/low noise amplifier and filter at least.Requiring RF far-end module RRU is 2 ports or multiport; And ceiling mount antenna is some.
According to preferred version of the present invention, described BBU can further include merge cells, be used for when up reception, the signal of two autonomous channels that will receive via described optical fiber interface, described RRU merges, and then carries out Base-Band Processing by described baseband processing module.Described merge cells can adopt equal gain combining, selecting type to merge or the high specific merging according to the signal of two autonomous channels of described RRU is strong and weak.
Accordingly, described BBU can further include selected cell, is used for when downlink, selects an optimal channel as the downlink passage in two autonomous channels of described RRU.Described selected cell can be selected optimal channel according to the up received power size of two autonomous channels of described RRU.
According to embodiments of the invention, cover at the indoor co-frequency cell of setting up, the topological structure of co-frequency cell is as shown in Figure 2.Can carry out subregion to indoor overlay area, number of cells is relevant with the venue area, and the sub-district distributes can rely on the beehive net structure.Each RRU is a sub-district, is covered by binary channels in the sub-district.Indoor identical networking, the frequency that indoor networking is adopted is different with outdoor base station.The ceiling mount antenna of two autonomous channel connections is placed apart in the sub-district, forms the effect of space diversity.
In Fig. 2, establishing the orthohexagonal length of side is S, and the rectangular area length that then is divided into is
Wide is 5s/3.When ceiling mount antenna is arranged, can think to carry out the foursquare length of side in a square area
Square area as shown in Figure 3.
A RRU is adopted in each sub-district, and each RRU has two independently passages, in ideal conditions, each independently passage connect 4 ceiling mount antennas as shown in Figure 3, wherein circle is a ceiling mount antenna under the passage, star be the affiliated ceiling mount antenna of another passage.By the layout of carrying out ceiling mount antenna as shown in Figure 3, from single subdistrict or whole network, ceiling mount antenna all is uniform.
According to preferred version of the present invention, the distance of ceiling mount antenna that should as far as possible guarantee to belong in two groups of autonomous channels different passages is greater than 10 times of transmission wavelength.Ceiling mount antenna is placed apart under in two groups of passages, and is evenly to distribute.
When the up reception of binary channels, the signal that ceiling mount antenna receives under two passages is independently, transforms to intermediate frequency in RRU, imports among the BBU through optical fiber interface to merge.All ceiling mount antenna received power sums of this passage under each passage received power equals, two passages independently pass to BBU with signal and merge.In order to reduce the pressure of Base-Band Processing, the signal of handling two autonomous channels adopts the power according to two channel signals relatively to adopt equal gain combining, selecting type to merge or the high specific merging.
When the binary channels downlink, according to the power that up two passages receive, therefore prominent that passage of selective reception, is to select optimum passage to launch as the downlink passage all the time.
Use binary channels covering of the present invention and compare,, have diversity gain, can increase substantially power system capacity because two passages spatially are independently with existing single channel covering.Show that at the checking that the present invention did this scheme can have a distinct increment to the capacity of system, lifting capacity is near 100%.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. a group network system that is used for the indoor covering of time division duplex synchro system is characterized in that,
Comprise a Base Band Unit BBU, a plurality of RF far-end module RRU, and a plurality of ceiling mount antennas, wherein, link to each other by optical fiber interface between described BBU and the RRU, each RRU has two autonomous channels, and each autonomous channel all comprises digital intermediate frequency unit, transceiver, power amplifier/low noise amplifier and the filter that connects successively at least, and each autonomous channel also connects several ceiling mount antennas separately.
2. the system as claimed in claim 1 is characterized in that,
Described BBU comprises GPS receiver module, master control/clock unit and the baseband processing module that connects successively at least.
3. system as claimed in claim 2 is characterized in that,
Described BBU further comprises merge cells, is used for when up reception, and the signal of two autonomous channels that will receive by described optical fiber interface, described RRU merges, and then carries out Base-Band Processing by described baseband processing module.
4. system as claimed in claim 3 is characterized in that,
Described merge cells is to adopt equal gain combining, selecting type to merge or the high specific merging according to the signal of two autonomous channels of described RRU is strong and weak.
5. system as claimed in claim 2 is characterized in that,
Described BBU further comprises selected cell, is used for when downlink, selects an optimal channel as the downlink passage in two autonomous channels of described RRU.
6. system as claimed in claim 5 is characterized in that,
Described selected cell is to select optimal channel according to the up received power size of two autonomous channels of described RRU.
7. the system as claimed in claim 1 is characterized in that,
Ceiling mount antenna under described two autonomous channels is placed apart, and is evenly to distribute.
8. the system as claimed in claim 1 is characterized in that,
Distance placed apart is greater than 10 times of transmission wavelength between the ceiling mount antenna under described two autonomous channels.
9. the system as claimed in claim 1 is characterized in that,
Described each RRU is an indoor cell; Cover by binary channels in the sub-district; The frequency of indoor identical networking is different with outdoor base station.
10. the system as claimed in claim 1 is characterized in that,
The mode that described group network system adopts subregion to cover is carried out with covering frequently indoor;
The sub-district number that adopts subregion to cover is relevant with the venue area, and the sub-district distributes and relies on the beehive net structure, the mode that the minizone adopts multi-plot joint to detect.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102241355A CN102075955A (en) | 2009-11-24 | 2009-11-24 | Networking system for indoor coverage of time division duplex synchronous system |
| PCT/CN2010/071766 WO2010148720A1 (en) | 2009-11-24 | 2010-04-14 | Networking system for indoor coverage of time division duplex synchronous system |
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| CN2009102241355A CN102075955A (en) | 2009-11-24 | 2009-11-24 | Networking system for indoor coverage of time division duplex synchronous system |
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| CN102075955A true CN102075955A (en) | 2011-05-25 |
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| CN103139795A (en) * | 2011-11-28 | 2013-06-05 | 中兴通讯股份有限公司 | Gain factor report method and grain factor report device |
| CN104427601A (en) * | 2013-08-29 | 2015-03-18 | 中国移动通信集团公司 | Method and device for adjusting channel power in two-channel indoor distribution system |
| CN106034364A (en) * | 2015-03-12 | 2016-10-19 | 上海贝尔股份有限公司 | Central baseband processing unit for indoor communication system and network architecture |
| CN107493600A (en) * | 2016-06-13 | 2017-12-19 | 中兴通讯股份有限公司 | A kind of massive MIMO communication devices and synchronous method |
| CN111586836A (en) * | 2020-04-30 | 2020-08-25 | 北京邮电大学 | Networking method and device for common frequency band base station |
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| CN102695305B (en) * | 2011-03-23 | 2015-08-12 | 中兴通讯股份有限公司 | baseband processing unit, base station and data transmission method |
| CN108738033A (en) * | 2018-06-26 | 2018-11-02 | 河南京科科技有限公司 | A kind of indoor covering system |
| CN113676916B (en) * | 2020-05-14 | 2023-04-18 | 中国电信股份有限公司 | Wireless communication system and method for improving signal coverage |
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Cited By (11)
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| CN103139795A (en) * | 2011-11-28 | 2013-06-05 | 中兴通讯股份有限公司 | Gain factor report method and grain factor report device |
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| CN104427601A (en) * | 2013-08-29 | 2015-03-18 | 中国移动通信集团公司 | Method and device for adjusting channel power in two-channel indoor distribution system |
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| CN106034364B (en) * | 2015-03-12 | 2019-10-11 | 上海诺基亚贝尔股份有限公司 | Central baseband processing unit and the network architecture for indoor communication system |
| CN107493600A (en) * | 2016-06-13 | 2017-12-19 | 中兴通讯股份有限公司 | A kind of massive MIMO communication devices and synchronous method |
| CN107493600B (en) * | 2016-06-13 | 2021-07-23 | 中兴通讯股份有限公司 | Massive MIMO communication device and synchronization method |
| CN111586836A (en) * | 2020-04-30 | 2020-08-25 | 北京邮电大学 | Networking method and device for common frequency band base station |
| CN111586836B (en) * | 2020-04-30 | 2021-07-23 | 北京邮电大学 | Networking method and device for common frequency band base station |
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| WO2010148720A1 (en) | 2010-12-29 |
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Application publication date: 20110525 |