CN201797604U - Base station subsystem - Google Patents
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- CN201797604U CN201797604U CN201020156374XU CN201020156374U CN201797604U CN 201797604 U CN201797604 U CN 201797604U CN 201020156374X U CN201020156374X U CN 201020156374XU CN 201020156374 U CN201020156374 U CN 201020156374U CN 201797604 U CN201797604 U CN 201797604U
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Abstract
The utility model provides a base station subsystem, which comprises a baseband processing unit (BBU) and a pair of single-channel radio remote units (RRUs). The BBU is connected with the pair of single-channel RRUs via optical fibers, and the pair of single-channel RRUs is respectively connected to two ports of a pair of dual-polarizing antennas via radiofrequency feed cables. In the downlink direction, the BBU sends the same baseband signal to the pair of single-channel RRUs, and the pair of single-channel RRUs converts the baseband signal into radiofrequency signals to be outputted to the dual-polarizing antenna, so that downlink polarizing transmission is realized. When in the uplink direction, the pair of single-channel RRUs converts the two channels of radiofrequency signals from the dual-polarizing antenna into two channels of baseband signals to be sent to the BBU, and the two channels of baseband signals are then associated by the BBU, so that uplink polarizing diversity reception is realized. The base station subsystem is capable of improving performance of wireless uplink and downlink so as to increase system capacity.
Description
Technical field
The utility model relates to moving communicating field, particularly a kind of base station sub-system.
Background technology
Time division multiplexing (TD) base station sub-system comprises baseband processing unit (BBU) and Remote Radio Unit (RRU), and described BBU is connected by optical fiber with described RRU, and RRU is divided into multichannel RRU and single channel RRU again.Multichannel RRU promptly provides the output of multichannel (port) radio frequency on a Remote Radio Unit, and single channel RRU only provides the output of one tunnel (port) radio frequency.Multichannel RRU is mainly used in the macro base station scene and smart antenna is used; Single channel RRU is mainly used in indoor covering scene.The principle of smart antenna is the direction that wireless signal guide is concrete, produce the spatial orientation wave beam, make antenna main beam aim at the subscriber signal arrival direction, secondary lobe or zero falls into aims at the interference signal arrival direction, reaches the purpose of fully efficiently utilizing mobile subscriber's signal and deletion or suppressing interference signal.
For high speed scenes such as some special scenes such as high ferro, subway, tunnel, magnetic are floating; if adopt multichannel RRU+ intelligent antenna technology; because for the covering requirement on realizing it This train is bound for XXX; usually the base station is arranged in the tens meters scopes along the line that leave the right or normal track, and it uses the major defect of multichannel RRU+ smart antenna as follows:
The first, at the base station near-end, the high speed of bullet train transverse direction between shaped-beam is switched, and the intelligent antenna figuration algorithm has been proposed high requirement, and industry is difficult to realize now, even realize that its cost is quite high.
Second, at far-end, trains etc. travel in the same shaped-beam of smart antenna, smart antenna is compared with common sectorized antennas, can not embody the advantage that the smart antenna lobe is followed, smart antenna can use the sectorized antennas than narrow beam to be substituted fully, thereby multichannel RRU has just lost the meaning of using.
Cover in the construction in indoor covering, sub-district, because the restriction that smart antenna uses in many scenes, often in TD networking process, select for use single channel RRU to add small-sized plate aerial of conventional perpendicular polarization or ceiling mount antenna (when perhaps using multichannel RRU, each autonomous channel covers the mode of zones of different).And this mode has been sacrificed the shaped-beam ability of TD, and figuration gain has been lost in the provisional capital up and down, and the up advantage that has more lost the minimizing that shaped-beam brought interference is from system-level link estimation, bigger to the influence of up-link capacity and covering.Smart antenna is one of distinctive key technology of TD, and its figuration gain (6-7dB) is one of key index that influences the system link design.Use single channel RRU to carry out indoor covering, because the forfeiture of figuration gain sharply descends TD system uplink downlink performance, the TD system capacity loss is serious, and through emulation, power system capacity will be lost about 2/3 (different according to the concrete scene of difference).
The utility model content
Technical problem to be solved in the utility model provides a kind of base station sub-system, improving the up-downgoing radio link performance, and then improves power system capacity.
For solving the problems of the technologies described above, the utility model provides technical scheme as follows:
A kind of base station sub-system comprises:
One baseband processing unit BBU and a pair of single channel radio frequency remote unit RRU, described BBU is connected by optical fiber with described a pair of single channel RRU, and described a pair of single channel RRU is connected to two ports of a dual polarized antenna respectively by the radio frequency feeder;
At down direction, described BBU sends to described a pair of single channel RRU with same baseband signal, and described a pair of single channel RRU exports described dual polarized antenna to after respectively described baseband signal being converted to radiofrequency signal, realizes descending polarization emission;
At up direction, described a pair of single channel RRU will send to described BBU after will being converted to the two-way baseband signal from the two-way radiofrequency signal of described dual polarized antenna, and described BBU carries out signal to described two-way baseband signal and merges, and realize that up polarization diversity receives.
Above-mentioned base station sub-system wherein, comprises that multistage radio frequency by the optical fiber cascade zooms out part, and every grade of radio frequency zooms out part and comprises described a pair of single channel RRU.
Above-mentioned base station sub-system, wherein, the signal that described BBU carries out described two-way baseband signal is merged into the high specific merging or selectivity merges.
Above-mentioned base station sub-system, wherein, described dual polarized antenna is ± 45 ° of dual polarized antennas.
A kind of base station sub-system comprises:
An one baseband processing unit BBU and a multichannel radio frequency remote unit RRU, described BBU is connected by optical fiber with described multichannel RRU, and two passages among the described multichannel RRU are connected to two ports of a dual polarized antenna respectively by the radio frequency feeder;
At down direction, described BBU sends to described two passages among the described multichannel RRU with same baseband signal, and described two passages export described dual polarized antenna to after respectively described baseband signal being converted to radiofrequency signal, realizes descending polarization emission;
At up direction, described two passages will send to described BBU after will being converted to the two-way baseband signal from the two-way radiofrequency signal of described dual polarized antenna, and described BBU carries out signal to described two-way baseband signal and merges, and realize that up polarization diversity receives.
Above-mentioned base station sub-system wherein, comprises that multistage radio frequency by the optical fiber cascade zooms out part, and every grade of radio frequency zooms out part and comprises a described multichannel RRU.
Above-mentioned base station sub-system, wherein, the signal that described BBU carries out described two-way baseband signal is merged into the high specific merging or selectivity merges.
Above-mentioned base station sub-system, wherein, described dual polarized antenna is ± 45 ° of dual polarized antennas.
Compared with prior art, the beneficial effects of the utility model are: by the increase of up-downgoing polarization, improved, improved the TD system in the up-downgoing radio link performance of using under non intelligent antenna (forfeiture figuration gain) situation, especially the performance for the TD up link has bigger benefiting; Because the lifting of up-downgoing radio link performance has improved system's carrier/interface ratio, also be improved for the power system capacity of TD under non intelligent antenna (forfeiture figuration gain) situation.
Description of drawings
Fig. 1 is the structural representation of the base station sub-system of the utility model embodiment one;
Fig. 2 is the structural representation of the base station sub-system of the utility model embodiment two;
Fig. 3 is the structural representation of the base station sub-system of the utility model embodiment three.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with the accompanying drawings and the specific embodiments the utility model is described in detail.
Embodiment one
With reference to Fig. 1, the base station sub-system of the utility model embodiment comprises: a BBU101 and a pair of single channel RRU102,103, BBU101 is connected by optical fiber with single channel RRU102,103, and single channel RRU102,103 is connected to two ports of a dual polarized antenna 104 respectively by the radio frequency feeder.Among the figure, solid line is represented optical fiber, and dotted line is represented the radio frequency feeder.
Described base station sub-system is as follows to the processing procedure of downstream signal:
BBU101 sends to single channel RRU102,103 with same baseband signal, single channel RRU102,103 exports dual polarized antenna 104 to after respectively described baseband signal being converted to radiofrequency signal, by dual polarized antenna 104 (for example with different polarization modes, ± 45 ° of polarization) described radiofrequency signal is sent, so, realized descending polarization emission.
Described base station sub-system is as follows to the processing procedure of upward signal:
Dual polarized antenna 104 (for example receives with different polarization modes, ± 45 ° of polarization) radiofrequency signal, obtain the two-way radiofrequency signal, described two-way radiofrequency signal is sent to single channel RRU102,103 respectively, after will being converted to the two-way baseband signal from the two-way radiofrequency signal of dual polarized antenna 104, single channel RRU102,103 sends to BBU101, by BBU101 described two-way baseband signal is carried out signal and merge, so, realized that up polarization diversity receives.
Wherein, to merge can be that high specific merges or selectivity merges to BBU101 signal that described two-way baseband signal is carried out.
Embodiment two
In the present embodiment, by a pair of single channel RRU in the multichannel RRU alternate embodiment one.
With reference to Fig. 2, the base station sub-system of the utility model embodiment comprises: a BBU201 and a multichannel RRU202, BBU201 is connected by optical fiber with multichannel RRU202, and two passages among the multichannel RRU202 are connected to two ports of a dual polarized antenna 203 respectively by the radio frequency feeder.Among the figure, solid line is represented optical fiber, and dotted line is represented the radio frequency feeder.
Described base station sub-system is as follows to the processing procedure of downstream signal:
BBU201 sends to described two passages among the multichannel RRU202 with same baseband signal, described two passages export dual polarized antenna 203 to after respectively described baseband signal being converted to radiofrequency signal, by dual polarized antenna 203 (for example with different polarization modes, ± 45 ° of polarization) described radiofrequency signal is sent, so, realized descending polarization emission.
Described base station sub-system is as follows to the processing procedure of upward signal:
Dual polarized antenna 203 (for example receives with different polarization modes, ± 45 ° of polarization) radiofrequency signal, obtain the two-way radiofrequency signal, described two-way radiofrequency signal is sent to described two passages respectively, described two passages will send to BBU201 after will being converted to the two-way baseband signal from the two-way radiofrequency signal of dual polarized antenna 203, by BBU201 described two-way baseband signal is carried out signal and merge, so, realized that up polarization diversity receives.
Wherein, to merge can be that high specific merges or selectivity merges to BBU201 signal that described two-way baseband signal is carried out.
Embodiment three
Present embodiment is that the cascade effect of RRU is used.
In some special screnes, as (the magnetic suspension of high-speed mobile main line scene, high ferro etc.), because under the fast state, for handover is normally carried out, system needs longer switching transitional region, under the prerequisite that does not reduce network performance, for thereby the number of times that reduces handover generation along the line reduces the possibility of switching call drop, a kind of settling mode is: a plurality of physical sectors of being made up of " RRU+ antenna " are merged into a logic sector, the coverage of a logic district is extended, original handover area is transformed into same logic district (handover no longer taking place at former switching point).
Existing producer equipment is subjected to the restriction of the total contained fan port number of this cascaded link CA for the cascade of RRU equipment under the same logic district, because multichannel RRU is 6 passages or 8 passages generally speaking, we are example with 8 passages, the contained fan of supposing logic district is configured to 6 contained fans, after adopting a multichannel RRU, total contained fan port number CA is: 6 contained fans * 8 passages=48CA, reached the limiting value of existing industry equipment, promptly for 8 passage RRU under 6 contained fans configurations, the cascade of RRU can not be carried out, that is the extension of logic district coverage can not be realized by multi-stage cascade.
Suppose to use 2 single channel RRU dual polarizations to connect, each level 2 RRU provide 2 ports, then the cascade of RRU number=48CA/6 contained fan/2 passages=4 grade RRU promptly can carry out 4 grades of dual polarizations and connect (promptly a logic district overlay area expands to original 4 times).
With reference to Fig. 3, the base station sub-system of the utility model embodiment comprises: a BBU301 and multistage (present embodiment is 3 grades) are zoomed out part by the radio frequency of optical fiber cascade, every grade of radio frequency zooms out part and comprises a pair of single channel RRU, be respectively single channel RRU302,303, single channel RRU304,305, single channel RRU306,307, single channel RRU302,303 are connected to two ports of a dual polarized antenna 308 respectively by the radio frequency feeder, single channel RRU304,305 are connected to two ports of a dual polarized antenna 309, single channel RRU306 respectively by the radio frequency feeder, 307 are connected to two ports of a dual polarized antenna 310 respectively by the radio frequency feeder.Among the figure, solid line is represented optical fiber, and dotted line is represented the radio frequency feeder.
At down direction, BBU101 sends to single channel RRU302,303 with same baseband signal, single channel RRU302,303 exports dual polarized antenna 308 to after respectively described baseband signal being converted to radiofrequency signal, by dual polarized antenna 308 (for example with different polarization modes, ± 45 ° of polarization) described radiofrequency signal is sent, so, realized descending polarization emission.
In addition, single channel RRU302,303 also is sent to single channel RRU304,305 with described baseband signal, single channel RRU304,305 exports dual polarized antenna 309 to after respectively described baseband signal being converted to radiofrequency signal, by dual polarized antenna 309 (for example with different polarization modes, ± 45 ° of polarization) described radiofrequency signal is sent, so, realized descending polarization emission.
In addition, single channel RRU304,305 also is sent to single channel RRU306,307 with described baseband signal, single channel RRU306,307 exports dual polarized antenna 310 to after respectively described baseband signal being converted to radiofrequency signal, by dual polarized antenna 310 (for example with different polarization modes, ± 45 ° of polarization) described radiofrequency signal is sent, so, realized descending polarization emission.
At up direction, dual polarized antenna 310 (for example receives with different polarization modes, ± 45 ° of polarization) radiofrequency signal, obtain the two-way radiofrequency signal, described two-way radiofrequency signal is sent to single channel RRU306,307 respectively, single channel RRU306,307 will pass through single channel RRU304,305 after will being converted to the two-way baseband signal from the two-way radiofrequency signal of dual polarized antenna 310, single channel RRU302,303 sends to BBU301, by BBU301 described two-way baseband signal being carried out signal merges, so, realized that up polarization diversity receives.
In addition, dual polarized antenna 309 (for example receives with different polarization modes, ± 45 ° of polarization) radiofrequency signal, obtain the two-way radiofrequency signal, described two-way radiofrequency signal is sent to single channel RRU304,305 respectively, after will being converted to the two-way baseband signal from the two-way radiofrequency signal of dual polarized antenna 309, single channel RRU304,305 sends to BBU301 by single channel RRU302,303, by BBU301 described two-way baseband signal being carried out signal merges, so, realized that up polarization diversity receives.
In addition, dual polarized antenna 307 (for example receives with different polarization modes, ± 45 ° of polarization) radiofrequency signal, obtain the two-way radiofrequency signal, described two-way radiofrequency signal is sent to single channel RRU302,303 respectively, will send to BBU301 after single channel RRU302,303 will be converted to the two-way baseband signal from the two-way radiofrequency signal of dual polarized antenna 104, by BBU301 described two-way baseband signal is carried out signal and merge, so, realized that up polarization diversity receives.
Wherein, to merge can be that high specific merges or selectivity merges to BBU301 signal that described two-way baseband signal is carried out.During the upward signal of wherein multistage RRU cascade system was handled, BBU301 can select successively to carry out for " sub-district of multistage RRU signal merges " and " polarization of each grade RRU merges " according to specific implementation.
In embodiment three, each radio frequency zooms out and handles level is a pair of single channel RRU, in other embodiment kinds, each radio frequency zooms out the processing level also can be a multichannel RRU, two passages among the described multichannel RRU are connected to two ports of a dual polarized antenna respectively by the radio frequency feeder, uplink and downlink signals handling process and embodiment three under this kind execution mode are similar, do not give unnecessary details here.
In sum, the base station sub-system of the utility model embodiment at down direction, is connected to the same road of two single channel RRU (or two autonomous channels of a multichannel RRU) output downstream signal of same BBU, has realized the polarization emission; At up direction, the two-way upward signal of ± 45 ° of dual polarized antenna receptions merges at the signal of base station end, having formed the polarization gain.Compare with conventional single channel RRU single polarization connected mode, up-downgoing can obtain the polarization gain of 3dB respectively by polarization applications, in having lost the TD system of figuration gain, the polarization gain of 3dB is for improving the radio link performance that promotes up-downgoing, it is most important to promote the wireless network capacity of eating dishes without rice or wine, and its capacity of eating dishes without rice or wine will have 80%～100% lifting in theory.
Compare with multichannel RRU cascade system; after using two single channel RRU (or two autonomous channels of a multichannel RRU) dual polarization to connect also cascade; under the situation that reaches 4 grades of cascades equally; the sub-district maximum can be configured to 6 contained fans; making an uproar in the end does not have obvious lifting; the capacity of eating dishes without rice or wine is protected; under the prerequisite that does not reduce network performance; logic district contained fan allocative abilities is protected; the covering power of logic district is effectively promoted simultaneously, has promoted the handover probability of successful under the high speed scene.
Should be noted that at last, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the spiritual scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (8)
1. a base station sub-system is characterized in that, comprising:
One baseband processing unit BBU and a pair of single channel radio frequency remote unit RRU, described BBU is connected by optical fiber with described a pair of single channel RRU, and described a pair of single channel RRU is connected to two ports of a dual polarized antenna respectively by the radio frequency feeder;
At down direction, described BBU sends to described a pair of single channel RRU with same baseband signal, and described a pair of single channel RRU exports described dual polarized antenna to after respectively described baseband signal being converted to radiofrequency signal, realizes descending polarization emission;
At up direction, described a pair of single channel RRU will send to described BBU after will being converted to the two-way baseband signal from the two-way radiofrequency signal of described dual polarized antenna, and described BBU carries out signal to described two-way baseband signal and merges, and realize that up polarization diversity receives.
2. base station sub-system as claimed in claim 1 is characterized in that, comprises that multistage radio frequency by the optical fiber cascade zooms out part, and every grade of radio frequency zooms out part and comprises described a pair of single channel RRU.
3. base station sub-system as claimed in claim 1 is characterized in that:
The signal that described BBU carries out described two-way baseband signal is merged into the high specific merging or selectivity merges.
4. base station sub-system as claimed in claim 1 is characterized in that:
Described dual polarized antenna is ± 45 ° of dual polarized antennas.
5. a base station sub-system is characterized in that, comprising:
An one baseband processing unit BBU and a multichannel radio frequency remote unit RRU, described BBU is connected by optical fiber with described multichannel RRU, and two passages among the described multichannel RRU are connected to two ports of a dual polarized antenna respectively by the radio frequency feeder;
At down direction, described BBU sends to described two passages among the described multichannel RRU with same baseband signal, and described two passages export described dual polarized antenna to after respectively described baseband signal being converted to radiofrequency signal, realizes descending polarization emission;
At up direction, described two passages will send to described BBU after will being converted to the two-way baseband signal from the two-way radiofrequency signal of described dual polarized antenna, and described BBU carries out signal to described two-way baseband signal and merges, and realize that up polarization diversity receives.
6. base station sub-system as claimed in claim 5 is characterized in that, comprises that multistage radio frequency by the optical fiber cascade zooms out part, and every grade of radio frequency zooms out part and comprises a described multichannel RRU.
7. base station sub-system as claimed in claim 5 is characterized in that:
The signal that described BBU carries out described two-way baseband signal is merged into the high specific merging or selectivity merges.
8. base station sub-system as claimed in claim 5 is characterized in that:
Described dual polarized antenna is ± 45 ° of dual polarized antennas.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020156374XU CN201797604U (en) | 2010-03-26 | 2010-03-26 | Base station subsystem |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020156374XU CN201797604U (en) | 2010-03-26 | 2010-03-26 | Base station subsystem |
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| CN201797604U true CN201797604U (en) | 2011-04-13 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259571A (en) * | 2012-02-15 | 2013-08-21 | 系通科技股份有限公司 | Expansion module of multiple input multiple output wireless communication system |
| WO2015027675A1 (en) * | 2013-09-02 | 2015-03-05 | 华为技术有限公司 | Communication device, baseband unit and communication method |
| CN104469826A (en) * | 2013-09-13 | 2015-03-25 | 中国移动通信集团海南有限公司 | Antenna scheduling method and system |
| CN105519233A (en) * | 2014-07-17 | 2016-04-20 | 华为技术有限公司 | Distributed base station |
| 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 |
| CN107635294A (en) * | 2017-09-22 | 2018-01-26 | 中国移动通信集团江苏有限公司 | Base station sub-system, method for transmitting signals, base station equipment and storage medium |
| US20210314029A1 (en) * | 2017-05-22 | 2021-10-07 | Teko Telecom S.R.L. | Wireless communication system and related method for processing uplink fronthaul data |
-
2010
- 2010-03-26 CN CN201020156374XU patent/CN201797604U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259571A (en) * | 2012-02-15 | 2013-08-21 | 系通科技股份有限公司 | Expansion module of multiple input multiple output wireless communication system |
| WO2015027675A1 (en) * | 2013-09-02 | 2015-03-05 | 华为技术有限公司 | Communication device, baseband unit and communication method |
| CN104469826A (en) * | 2013-09-13 | 2015-03-25 | 中国移动通信集团海南有限公司 | Antenna scheduling method and system |
| CN105519233A (en) * | 2014-07-17 | 2016-04-20 | 华为技术有限公司 | Distributed base station |
| 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 |
| US20210314029A1 (en) * | 2017-05-22 | 2021-10-07 | Teko Telecom S.R.L. | Wireless communication system and related method for processing uplink fronthaul data |
| US11509356B2 (en) * | 2017-05-22 | 2022-11-22 | Teko Telecom S.R.L. | Wireless communication system and related method for processing uplink fronthaul data |
| US20230035330A1 (en) * | 2017-05-22 | 2023-02-02 | Teko Telecom S.R.L. | Wireless communication system and related method for processing uplink fronthaul data |
| US11962369B2 (en) * | 2017-05-22 | 2024-04-16 | Teko Telecom S.R.L. | Wireless communication system and related method for processing uplink fronthaul data |
| CN107635294A (en) * | 2017-09-22 | 2018-01-26 | 中国移动通信集团江苏有限公司 | Base station sub-system, method for transmitting signals, base station equipment and storage medium |
| CN107635294B (en) * | 2017-09-22 | 2021-06-29 | 中国移动通信集团江苏有限公司 | Base station subsystem, signal transmission method, base station device, and storage medium |
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