CN101594667B - Method and system for transmitting signal based on remote radiofrequency (RF) units - Google Patents
Method and system for transmitting signal based on remote radiofrequency (RF) units Download PDFInfo
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- CN101594667B CN101594667B CN2009100877597A CN200910087759A CN101594667B CN 101594667 B CN101594667 B CN 101594667B CN 2009100877597 A CN2009100877597 A CN 2009100877597A CN 200910087759 A CN200910087759 A CN 200910087759A CN 101594667 B CN101594667 B CN 101594667B
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Abstract
The invention discloses a method and system for transmitting a signal based on remote RF units. The method for transmitting the signal sends information to a receiving terminal through a first remote RF unit and a second remote RF unit which are adjacent and within the transmitting area of the same base station, and comprises the following steps that the first remote RF unit sends the information to the receiving terminal at a first moment; and the second remote RF unit also sends the information to the receiving terminal at the first moment, and sends the information again to the receiving terminal at a second moment after a preset period of time. The system and method for transmitting the signal can achieve the effect of reducing signal fading by adopting one of two adjacent RRUs within the same base station area to send the same information signal twice and making use of the signal sent for the second time to ensure that the signal received by the terminal has a direct current of higher power.
Description
Technical field
The present invention relates to wireless communication technology field, refer in particular to a kind of being applied under the high speed scene, signaling method and system based on BBU (Base Band Unit, baseband processing unit)+RRU (Radio Remote Unit, remote radio unit (RRU)) cloth station mode.
Background technology
Along with the China railways speed raising, support that the proper communication under the high-speed mobile scene is pressing for of TD-SCDMA system.
The cloth station mode of Shanghai magnetic suspension track--BBU+RRU cloth station mode is the optimal way at cloth station, base station under a kind of typical high-speed mobile environment, wherein the characteristics of BBU+RRU cloth station mode comprise: the RRU that linear cloth station, BBU separate with RRU, two belong to same sub-district sends same signal simultaneously with constant power, compare with the traditional base station, BBU+RRU cloth station mode receives the signal under the high speed scene, and reducing aspect such as switching times has bigger improvement.
Fig. 1 is in the mode of BBU+RRU cloth station, the model schematic diagram that the RRU channel is provided with, when base station transmit signals, two adjacent RRU send signal with constant power simultaneously, as RRU among Fig. 1 100 and RRU200, the constant power signal that sends simultaneously represents with S1 and S2 respectively in Fig. 1, like this as two signal component S1, when S2 arrives receiving terminal 300 simultaneously, owing to there is phase difference, the stack of two signals can produce violent decline.In addition; because this decline can continue the transmission time of 1 chip usually; for TD-SCDMA, there are 234 meters long approximately; consider that the reference distance between current two RRU is generally 1500 meters; this decline is still in practical communication and can't ignores; therefore adopt BBU+RRU cloth station mode, must take some corresponding anti-fading algorithms, otherwise can't guarantee the regular traffic of receiving terminal 300.
Like this, for the mode of BBU+RRU cloth station, for the operate as normal of safeguards system, delivery plan how effectively to optimize the RRU signal becomes the technical problem that needs to be resolved hurrily in the mode of BBU+RRU cloth station.
Summary of the invention
The purpose of technical solution of the present invention provides a kind of signaling method and system based on remote radio unit (RRU) (RRU), adopts described system and method can avoid two adjacent RRU to send the violent decline that is produced when signal meets.
To achieve these goals, one aspect of the present invention provides a kind of signaling method based on remote radio unit (RRU), by being in the same base station zone and the first adjacent remote radio unit (RRU) and second remote radio unit (RRU) send an information to a receiving terminal, described signaling method comprises:
Described first remote radio unit (RRU) constantly sends described information to described receiving terminal first, and the signal that wherein sends described information is first signal;
Described second remote radio unit (RRU) constantly sends described information to described receiving terminal described first, at interval after the Preset Time, constantly send described information to described receiving terminal again second, wherein said second remote radio unit (RRU) is a secondary signal at described first signal that sends described information constantly, at described second signal that sends described information constantly is the 3rd signal, and the power sum of described secondary signal and described the 3rd signal equals the power of described first signal.
Preferably, above-mentioned described signaling method, the watt level of described secondary signal and described the 3rd signal is respectively half of power of described first signal.
Preferably, above-mentioned described signaling method, described Preset Time are the transmission duration of 1 to 3 chip.
The present invention provides a kind of signal sending system based on remote radio unit (RRU) on the other hand, is used for sending an information to a receiving terminal, and described signal sending system comprises:
First remote radio unit (RRU) is arranged in the base station zone, is used for: constantly send described information to described receiving terminal first, the signal that wherein sends described information is first signal;
Second remote radio unit (RRU), be arranged in the described base station zone, and described second remote radio unit (RRU) is adjacent with described first remote radio unit (RRU), be used for: constantly send described information to described receiving terminal described first, at interval after the Preset Time, constantly send described information to described receiving terminal again second, wherein said second remote radio unit (RRU) is a secondary signal at described first signal that sends described information constantly, at described second signal that sends described information constantly is the 3rd signal, and the power sum of described secondary signal and described the 3rd signal equals the power of described first signal.
Preferably, above-mentioned described signal sending system, the watt level of described secondary signal and described the 3rd signal is respectively half of power of described first signal.
Preferably, above-mentioned described signal sending system, described Preset Time are the transmission duration of 1 to 3 chip.
Preferably, above-mentioned described signal sending system, described second remote radio unit (RRU) includes:
Time control module is used to control the transmitting time of described secondary signal and described the 3rd signal;
Power control module, the transmitted power that is used to distribute described secondary signal and described the 3rd signal makes the power sum of described secondary signal and described the 3rd signal equal the power of described first signal.
In the technique scheme at least one has following beneficial effect: described signal sending system of the specific embodiment of the invention and signaling method, be applied in the mode of BBU+RRU cloth station, the wherein RRU among the two adjacent RRU sends twice for same information signal in the same base station area by making, utilize the signal that sends for the second time to guarantee to have a DC component that power is bigger in the terminal received signal, can reach the effect that alleviates signal fadeout.
Description of drawings
Fig. 1 is in the mode of prior art BBU+RRU cloth station, the model structure schematic diagram that the RRU channel is provided with;
Fig. 2 sends the schematic flow sheet of an information for adopting the described method of the specific embodiment of the invention to receiving terminal;
Schematic diagram when Fig. 3 represents that each remote radio unit (RRU) sends signal in the described signal sending system.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
The specific embodiment of the invention described signaling method and system based on remote radio unit (RRU) (RRU), change in the mode of prior art BBU+RRU cloth station, two adjacent RRU send the mode of same information signal simultaneously in the same base station cell with constant power, wherein RRU among the two adjacent RRU is sent twice for same information signal, guarantee to have a DC component that power is bigger in the terminal received signal by the signal that sends for the second time, obtain to alleviate the effect of decline.
Send the schematic flow sheet of an information as Fig. 2 to receiving terminal for adopting method as described in the specific embodiment of the invention.Consult Fig. 2, adopt the described method of the specific embodiment of the invention, by being in same base station zone, and adjacent RRU1 and RRU2 comprise to the process that receiving terminal sends an information:
Step S201, RRU1 constantly sends described information to described receiving terminal first;
Step S202, RRU2 also sends described information to described receiving terminal simultaneously constantly first;
Step S203, RRU2 constantly sends described information to described receiving terminal again second.
In the specific embodiment of the invention, RRU1 is designated as first signal at first signal that sends described information constantly, RRU2 is designated as secondary signal at first signal that sends described information constantly, RRU2 is designated as the 3rd signal at described second signal that sends described information constantly, and wherein the power sum of secondary signal and the 3rd signal should equal the power of first signal.
Also promptly under the mode of BBU+RRU cloth station, when belonging to same base station and adjacent RRU1 and RRU2 when receiving terminal sends signal, RRU2 sends twice same information, RRU2 sends the signal of same information content to receiving terminal simultaneously with RRU1 for the first time, interval one Preset Time, send the signal of same information content once more in second moment, best, this interval Preset Time is the transmission time of 1 to 3 chip, and the power that RRU2 is transmitted for twice can dynamically be adjusted, but guarantee that the power sum that is transmitted for twice equals the power of same information signal that RRU1 launches, wherein a kind of method of salary distribution then is half of power that RRU2 is transmitted for twice power that equals same information signal that RRU1 launches respectively.
Like this, when secondary signal also is that RRU2 transmits for the first time, with first signal also be that RRU1 transmits, when receiving terminal meets, even because phase difference, make the receiving terminal received signal produce decline, but because receiving terminal receives the 3rd signal with same information content again, also be that RRU2 transmits for the second time, make the receiving terminal received signal that the big DC component of a power be arranged, therefore reach when avoiding two adjacent RRU1 and RRU2 to send same information signal to receiving terminal simultaneously, received signal produces the problem of decline at receiving terminal.
The specific embodiment of the invention also provides a kind of signal sending system on the other hand, be applied in the BBU+RRU cloth station mode of communication system, wherein a plurality of remote radio unit (RRU)s of this signal sending system are positioned at same base station zone, adjacent in twos remote radio unit (RRU) is respectively first remote radio unit (RRU) 10 and second remote radio unit (RRU) 20, utilizes first remote radio unit (RRU) 10 and second remote radio unit (RRU) 20 to send an information to a receiving terminal.
Schematic diagram when each remote radio unit (RRU) sends signal in the signal sending system as described in being used to represent as Fig. 3, particularly, for first remote radio unit (RRU) 10 and second remote radio unit (RRU) 20 of signal sending system, when a receiving terminal sends an information signal in the following way:
First remote radio unit (RRU) 10 sends information to receiving terminal constantly first;
Second remote radio unit (RRU) 20, adjacent with described first remote radio unit (RRU) 10, be used for constantly sending described information simultaneously, and after one Preset Time of interval, send described information constantly again second with described first remote radio unit (RRU) 10 described first.
In the specific embodiment of the invention, first remote radio unit (RRU) 10 is designated as first signal at first signal that sends described information constantly, second remote radio unit (RRU) 20 is designated as secondary signal at first signal that sends described information constantly, second remote radio unit (RRU) 20 is designated as the 3rd signal at described second signal that sends described information constantly, and wherein the power sum of secondary signal and the 3rd signal should equal the power of first signal.
In Fig. 3, adopt solid arrow to be used to represent first remote radio unit (RRU) 10 and second remote radio unit (RRU) 20, adopt dotted arrow to be used to represent that second remote radio unit (RRU) 20 is at second the 3rd signal that sends constantly in first first signal and the secondary signal that sends respectively constantly.
Also promptly under the mode of BBU+RRU cloth station, when belonging to the same base station and adjacent first remote radio unit (RRU) 10 and second remote radio unit (RRU), 20 receiving terminals and send signal, 20 pairs of same information signals of second remote radio unit (RRU) send twice, second remote radio unit (RRU) 20 sends the signal of same information content to receiving terminal simultaneously with first remote radio unit (RRU) 10 for the first time, interval one Preset Time, constantly send the signal of same information content once more second, and guarantee that the power sum of twice emitting signal equals the power of the first same information signal that remote radio unit (RRU) 10 is launched.
Like this, receiving terminal utilizes second remote radio unit (RRU) 20 to transmit for the second time, received signal has the big DC component of a power, reaches when avoiding two adjacent RRU1 and RRU2 to send same information signal to receiving terminal simultaneously, and received signal produces the problem of decline at receiving terminal.
In addition, send signal in order can accurately, in time to match with described first remote radio unit (RRU) 10 to receiving terminal, described second remote radio unit (RRU) 20 comprises:
Time control module, be used to control the transmitting time of described secondary signal and described the 3rd signal, also promptly control the time of second remote radio unit (RRU), 20 twice same information content of transmission, guarantee that the secondary signal transmitting time also promptly sends the time of information for the first time to receiving terminal, the time that sends these information with first remote radio unit (RRU) 10 can be synchronous, the 3rd signal sending time also promptly sends the time of information for the second time to receiving terminal, with secondary signal institute transmission time interval be 1 to 3 chip transmission duration, be 2 chip times best;
Power control module, be used to distribute the transmitted power of described secondary signal and described the 3rd signal, make the power sum of described secondary signal and described the 3rd signal equal the power of described first signal, also promptly when first remote radio unit (RRU) 10 and second remote radio unit (RRU) 20 when receiving terminal sends the signal of the same information content, the power when the power sum that second remote radio unit (RRU) 20 sends signals for twice equals second remote radio unit (RRU) 10 and once sends signal.
Comprehensively above-mentioned, described signal sending system of the specific embodiment of the invention and signaling method, by making in the same base station area, wherein RRU among the two adjacent RRU sends twice for same information signal, utilize the signal that sends for the second time to guarantee to have a DC component that power is bigger in the terminal received signal, can reach the effect that alleviates signal fadeout.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. signaling method based on remote radio unit (RRU), by being in the same base station zone and the first adjacent remote radio unit (RRU) and second remote radio unit (RRU) send an information to a receiving terminal, it is characterized in that described signaling method comprises:
Described first remote radio unit (RRU) constantly sends described information to described receiving terminal first, and the signal that wherein sends described information is first signal;
Described second remote radio unit (RRU) constantly sends described information to described receiving terminal described first, at interval after the Preset Time, constantly send described information to described receiving terminal again second, wherein said second remote radio unit (RRU) is a secondary signal at described first signal that sends described information constantly, at described second signal that sends described information constantly is the 3rd signal, and the power sum of described secondary signal and described the 3rd signal equals the power of described first signal.
2. signaling method as claimed in claim 1 is characterized in that, the watt level of described secondary signal and described the 3rd signal is respectively half of power of described first signal.
3. as each described signaling method of claim 1 to 2, it is characterized in that described Preset Time is the transmission duration of 1 to 3 chip.
4. the signal sending system based on remote radio unit (RRU) is used for sending an information to a receiving terminal, it is characterized in that described signal sending system comprises:
First remote radio unit (RRU) is arranged in the base station zone, is used for: constantly send described information to described receiving terminal first, the signal that wherein sends described information is first signal;
Second remote radio unit (RRU), be arranged in the described base station zone, and described second remote radio unit (RRU) is adjacent with described first remote radio unit (RRU), be used for: constantly send described information to described receiving terminal described first, at interval after the Preset Time, constantly send described information to described receiving terminal again second, wherein said second remote radio unit (RRU) is a secondary signal at described first signal that sends described information constantly, at described second signal that sends described information constantly is the 3rd signal, and the power sum of described secondary signal and described the 3rd signal equals the power of described first signal.
5. signal sending system as claimed in claim 4 is characterized in that, the watt level of described secondary signal and described the 3rd signal is respectively half of power of described first signal.
6. as each described signal sending system of claim 4-5, it is characterized in that described Preset Time is the transmission duration of 1 to 3 chip.
7. signal sending system as claimed in claim 6 is characterized in that, described second remote radio unit (RRU) includes:
Time control module is used to control the transmitting time of described secondary signal and described the 3rd signal;
Power control module, the transmitted power that is used to distribute described secondary signal and described the 3rd signal makes the power sum of described secondary signal and described the 3rd signal equal the power of described first signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100877597A CN101594667B (en) | 2009-06-22 | 2009-06-22 | Method and system for transmitting signal based on remote radiofrequency (RF) units |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100877597A CN101594667B (en) | 2009-06-22 | 2009-06-22 | Method and system for transmitting signal based on remote radiofrequency (RF) units |
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| Publication Number | Publication Date |
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| CN101594667A CN101594667A (en) | 2009-12-02 |
| CN101594667B true CN101594667B (en) | 2011-05-11 |
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| CN102523125B (en) * | 2011-12-27 | 2014-05-28 | 北京佳讯飞鸿电气股份有限公司 | Method for suppressing railway digital circle node state change event storm |
| CN104684099B (en) * | 2013-11-28 | 2018-05-22 | 中国科学院声学研究所 | A kind of dynamic resource allocation method and system based on base band centralized processing framework |
| CN105517000B (en) * | 2015-11-25 | 2018-12-18 | 中国联合网络通信集团有限公司 | A kind of method and device of cell splitting |
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Granted publication date: 20110511 Termination date: 20180622 |