CN101420704B - Method, device and system for covering tunnel in time division duplexing system - Google Patents
Method, device and system for covering tunnel in time division duplexing system Download PDFInfo
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- CN101420704B CN101420704B CN2007101761777A CN200710176177A CN101420704B CN 101420704 B CN101420704 B CN 101420704B CN 2007101761777 A CN2007101761777 A CN 2007101761777A CN 200710176177 A CN200710176177 A CN 200710176177A CN 101420704 B CN101420704 B CN 101420704B
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Abstract
The invention discloses a method used for covering tunnels in a TDD system, comprising the steps as follows: a plurality of signals output by a remote radio frequency unit RRU are calibrated; two signals are selected out of a plurality of calibrated signals; the two signals are respectively used for covering tunnels. Two or more signals are used for covering tunnels, therefore, the emission power of the downlink signal can be greatly improved, the receiving gain of the uplink signal can be greatly improved, thus improving the practical coverage distance and meeting the coverage requirement better. The invention also provides equipment which is used for covering the tunnels in the TDD system, and a system which is used for covering the tunnels in the TDD system.
Description
Technical field
The present invention relates to time division duplex (TDD) system, relate in particular to the method, apparatus and system that in a kind of TDD system tunnel covered.
Background technology
When the tunnel was carried out the networking of mobile communication system, for safety be beneficial to the consideration of factor such as operation maintenance, tunnel internal did not generally advise being equipped with source device, as power amplifier, fiber optic stretch unit etc.Owing to source device can not be installed, so signal can not amplify by activated amplifier.Because the tunnel is generally longer, need long feeder line, so just require information source that higher transmitting power is arranged.
At present, when using the TDD system that the tunnel is covered, use baseband extension type macro base station usually.Fig. 1 shows a kind of method that the tunnel is covered.
After 6 tunnel output signals of remote radio unit (RRU) (RRU) S11 were calibrated through coupling disc S12, the road signal of choosing wherein was used to cover the tunnel, and this road signal carries out the tunnel by leaky cable and covers.
The problem that this method exists is: because the covering of distance need be grown in the tunnel, and the down transmitting power of one-channel signal is lower, therefore can't satisfy actual tunnel and cover requirement.
Summary of the invention
In view of this, the technical problem that the present invention solves provides the method that in a kind of TDD system tunnel is covered, and improving the power output of actual downstream signal, and then improves actual coverage distance.
The present invention also provides the equipment that in a kind of TDD system tunnel is covered, and the system that in a kind of TDD system tunnel is covered.
For this reason, technical scheme provided by the invention is as follows:
The method that in a kind of tdd systems the tunnel is covered comprises:
Multiple signals to RRU output are calibrated;
From the multiple signals after the calibration, choose two paths of signals;
The two paths of signals that employing is chosen carries out the tunnel respectively and covers.
The method that in a kind of tdd systems the tunnel is covered comprises:
Multiple signals to RRU output are calibrated;
Multiple signals after the calibration are divided into two parts;
Multiple signals to each part merge respectively;
Signal after the two-way merging that obtains is carried out the tunnel respectively to be covered.
In certain embodiments, the multiple signals after described will the calibration are divided into two parts, and specific implementation is: the multiple signals after will all calibrating are divided into two parts.
In certain embodiments, the multiple signals after described will the calibration are divided into two parts, and specific implementation is: partly the multiple signals after the calibration are divided into two parts.
The present invention also proposes the equipment that in a kind of tdd systems the tunnel covered, comprising:
The coupling disc that the multichannel input signal of outside is calibrated;
First mixer that first's multichannel output signal of coupling disc is merged; With
Second mixer that the second portion multichannel output signal of coupling disc is merged;
The output signal of first mixer, second mixer is used for the tunnel is covered as the output signal of described equipment.
The present invention also proposes the system that in a kind of tdd systems the tunnel covered, comprises RRU, and this system also comprises: the coupling disc that the multichannel output signal of RRU is calibrated;
First mixer that first's multichannel output signal of coupling disc is merged; With
Second mixer that the second portion multichannel output signal of coupling disc is merged;
The output signal of first mixer, second mixer is used for the tunnel is covered as the output signal of described system.
As can be seen, owing to adopt two paths of signals that the tunnel is covered,, adopt every road signal figuration to send therefore at down direction, form the situation that similar smart antenna sends in the space, can reach the gain of 20*log (2)=6db with respect to the transmission of one-channel signal.At up direction, still continue to use spaced antenna and handle, owing to adopt two antennas to receive, receive the gain that can reach 10*log (2)=3dBd with respect to one-channel signal.As can be seen, adopt two-way even multiple signals that the tunnel is covered, not only can improve downlink signal transmitting power greatly, can also improve the receiving gain of upward signal greatly.Thereby can improve actual coverage distance, satisfy the tunnel better and cover requirement.
Description of drawings
Fig. 1 is the schematic diagram that in the existing a kind of TDD system tunnel is covered;
Fig. 2 is the method flow diagram that in a kind of TDD provided by the invention system tunnel is covered;
Fig. 3 is first schematic diagram that the tunnel is covered provided by the invention;
Fig. 4 is the method flow diagram that in the another kind of TDD provided by the invention system tunnel is covered;
Fig. 5 is second schematic diagram that the tunnel is covered provided by the invention;
Fig. 6 is the 3rd schematic diagram that the tunnel is covered provided by the invention;
Fig. 7 is the equipment schematic diagram that in a kind of TDD provided by the invention system tunnel is covered.
Embodiment
The existing method that the tunnel is covered, owing to adopt one-channel signal to cover the tunnel, and the down transmitting power of one-channel signal is lower, therefore can't satisfy actual tunnel and cover requirement.Even if can improve the down transmitting power of one-channel signal, but, still can't improve the receiving sensitivity of upward signal, be difficult to satisfy the tunnel and cover requirement at up direction.
Basic thought of the present invention is, adopt two-way even multichannel output signal to cover the tunnel respectively, not only can improve downlink signal transmitting power greatly, can also improve the receiving gain of upward signal greatly, thereby can improve actual coverage distance, satisfy the tunnel better and cover requirement.
For making those skilled in the art understand the present invention better, technical scheme provided by the invention is further described below in conjunction with specific embodiment.
Fig. 2 shows the method that in a kind of TDD system tunnel is covered.
In step 21, the multiple signals of RRU output are calibrated.
In step 22, from the multiple signals after the calibration, choose two paths of signals.
In step 23, adopt the two paths of signals of choosing to carry out the tunnel respectively and cover, that is, the two paths of signals of choosing is carried out the tunnel by leaky cable respectively cover.
In said method, at down direction, adopt every road signal figuration to send, form the situation that similar smart antenna sends in the space, can reach the gain of 20*log (2)=6db with respect to the transmission of one-channel signal.At up direction, still continue to use spaced antenna and handle, owing to adopt two antennas to receive, receive the gain that can reach 10*log (2)=3dBd with respect to one-channel signal.
Fig. 3 is the schematic diagram of said method.For a nearlyer step ground improves actual coverage distance, can also further multiple signals be merged, thereby the power of raising downstream signal is used for the signal after merging the tunnel is covered.Fig. 4 shows the flow process of this method.
In step 41, the multiple signals of RRU output are calibrated.
In step 42, the multiple signals after the calibration are divided into two parts.
Wherein, described multiple signals both can be the signals after all calibrations, also can be the signals after the part calibration.
In step 43, the multiple signals to each part merge respectively, thereby can obtain the signal after two-way merges.
In step 44, the signal after the two-way merging that obtains is carried out the tunnel respectively cover, that is, the signal after the two-way merging is carried out the tunnel by leaky cable respectively cover.
Fig. 5 is a schematic diagram of said method.In Fig. 5, be two parts with 6 tunnel signal halves after the calibration, each part comprises 3 road signals.3 road signals with each part merge respectively, obtain 2 tunnel signals after merging.Signal after described 2 tunnel merging is sent to leaky cable respectively, carry out the tunnel and cover.
Fig. 6 is another schematic diagram of said method.In Fig. 6, with the part signal after the calibration, 4 road signals are divided into two parts, and each part comprises 2 road signals.2 road signals with each part merge respectively, obtain 2 tunnel signals after merging.Signal after described 2 tunnel merging is sent to leaky cable respectively, carry out the tunnel and cover.
As can be seen, in Fig. 5 and Fig. 6, the signal way of two parts of signals is identical.In actual applications, according to different situations, the signal way of two parts of signals also can be different.For example, can be two parts with 6 tunnel division of signal after the calibration, a part comprises 4 road signals, another part comprises 2 road signals; Perhaps can choose 5 road signals after the calibration, be two parts with 5 tunnel division of signal, and a part comprises 3 road signals, and another part comprises 2 road signals.
The present invention also provides the equipment that in a kind of TDD system tunnel is covered, as shown in Figure 7.This equipment comprises: coupling disc S72 and two mixer S71.
Coupling disc S72 calibrates the multichannel input signal of outside, and 6 tunnel output signals that are about to remote radio unit (RRU) S11 are calibrated.Multichannel output signal through coupling disc S72 calibration is divided into two parts.
Wherein, described multichannel output signal both can be the full-scale output of coupling disc S72, also can be the part output signal of coupling disc S12; The signal way of every part can equate also can be unequal.
In Fig. 7, the full-scale output of coupling disc S72 is divided into two parts, and each part comprises 3 tunnel output signals.
Two mixer S71 merge 3 tunnel output signals of each part respectively, merge the output signal of the two paths of signals of back acquisition as described equipment, are used to cover the tunnel.
The two-way output signal of described equipment will be passed through leaky cable respectively, carry out the tunnel and cover.
It can also be seen that from Fig. 7 remote radio unit (RRU) S11, coupling disc S72 and two mixer S71 also can be used as the system that a cover covers the tunnel on the whole.
Though the foregoing description all is that the multichannel output signal after the calibration is divided into two parts, those skilled in the art can find out significantly, the multichannel output signal after the calibration can be divided into N part equally, and wherein N is the integer greater than 2.Then, the multichannel output signal with each part merges respectively, can obtain the signal after the N road merges, and the signal after the merging of N road is used for the tunnel covering.
Described disclosed embodiment is provided, can be so that those skilled in the art can realize or use the present invention.To those skilled in the art, the various modifications of these embodiment are conspicuous, and the general principles of definition here also can be applied to other embodiment on the basis that does not depart from the scope of the present invention with purport.Above-described embodiment only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the method that in the tdd systems tunnel is covered is characterized in that, comprising:
Multiple signals to remote radio unit (RRU) RRU output are calibrated;
From the multiple signals after the calibration, choose two paths of signals;
The two paths of signals that employing is chosen carries out the tunnel respectively and covers.
2. the method that in the tdd systems tunnel is covered is characterized in that, comprising:
Multiple signals to remote radio unit (RRU) RRU output are calibrated;
Multiple signals after the calibration are divided into two parts;
Multiple signals to each part merge respectively;
Signal after the two-way merging that obtains is carried out the tunnel respectively to be covered.
3. method as claimed in claim 2 is characterized in that, the multiple signals after described will the calibration are divided into two parts, and specific implementation is: the multiple signals after will all calibrating are divided into two parts.
4. method as claimed in claim 2 is characterized in that, the multiple signals after described will the calibration are divided into two parts, and specific implementation is: partly the multiple signals after the calibration are divided into two parts.
5. the equipment that in the tdd systems tunnel is covered is characterized in that, comprising:
The coupling disc that the multichannel input signal of outside is calibrated;
First mixer that first's multichannel output signal of coupling disc is merged; With
Second mixer that the second portion multichannel output signal of coupling disc is merged;
The output signal of first mixer, second mixer is used for the tunnel is covered as the output signal of described equipment.
6. the system that in the tdd systems tunnel is covered comprises remote radio unit (RRU) RRU, it is characterized in that, also comprises: the coupling disc that the multichannel output signal of RRU is calibrated;
First mixer that first's multichannel output signal of coupling disc is merged; With
Second mixer that the second portion multichannel output signal of coupling disc is merged;
The output signal of first mixer, second mixer is used for the tunnel is covered as the output signal of described system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101761777A CN101420704B (en) | 2007-10-22 | 2007-10-22 | Method, device and system for covering tunnel in time division duplexing system |
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| CN2007101761777A CN101420704B (en) | 2007-10-22 | 2007-10-22 | Method, device and system for covering tunnel in time division duplexing system |
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| CN101420704B true CN101420704B (en) | 2010-04-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011069275A1 (en) | 2009-12-09 | 2011-06-16 | Telefonaktiebolaget L M Ericsson (Publ) | A method and device for compensating frequency response of a filter unit in remote radio unit in real time |
| CN104218981B (en) * | 2014-08-26 | 2018-03-20 | 大唐移动通信设备有限公司 | The combination treatment method and equipment of a kind of multiple antennas |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1751484A (en) * | 2002-10-25 | 2006-03-22 | 高通股份有限公司 | Channel calibration for a time division duplexed communication system |
| CN101039134A (en) * | 2007-04-19 | 2007-09-19 | 中兴通讯股份有限公司 | Method for realizing transmitter diversity using two remote RF units |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1751484A (en) * | 2002-10-25 | 2006-03-22 | 高通股份有限公司 | Channel calibration for a time division duplexed communication system |
| CN101039134A (en) * | 2007-04-19 | 2007-09-19 | 中兴通讯股份有限公司 | Method for realizing transmitter diversity using two remote RF units |
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