CN103916864A - Wireless repeater and signal transmitting method thereof - Google Patents
Wireless repeater and signal transmitting method thereof Download PDFInfo
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Abstract
The invention provides a wireless repeater and a signal transmitting method thereof, and relates to the field of wireless communication. A wireless repeater comprises a transmission channel which is used for transmitting a signal between a base station and a user terminal, a control unit which is connected with the transmission channel and is used for determining the timeslot allocation of the base station according to the signal of the base station and generating a control instruction and a switch unit which is connected with the transmission channel and is used for switching to a first state or a second state according to the control instruction, wherein the first state is the state of enabling the base station to conduct a uplink timeslot transmitting signal, and the second state is the state of enabling the base station to conduct a downlink timeslot transmitting signal. By means of the technical scheme, reciprocity of a time division duplex communication system is guaranteed, the device can be simplified, and cost can be reduced.
Description
Technical field
The present invention relates to the communications field, refer to especially a kind of wireless discharging-directly station and signal transmission method thereof.
Background technology
Because wireless signal is along with the increase of propagation distance decays, therefore Cell Edge User and blind area user due to signal a little less than, poor-performing.In order to solve weak covering and degree of depth covering problem, in current 2G existing network, be widely used repeater and improved covering.According to application scenarios, repeater can be divided into indoor repeater and outdoor repeater station.
Wireless discharging-directly station is the same relay station frequently of one that mobile communication signal is directly amplified.It is not changing the frequency of original signal, also the entrained information of signal is not made the intensity of amplifying signal under any disposition.
In gsm system, upward signal and downstream signal use respectively different frequency ranges, are the duplex modes that adopts FDD.Because the frequency range of upward signal and downstream signal is different from direction, desired signal strength signal intensity is also different, and therefore direct amplification machine must possess the ability that uplink and downlink signals is processed respectively, and uplink and downlink signal adopts respectively two covers independently to receive and dispatch path.
In timesharing Long Term Evolution TD-LTE system, owing to having adopted the duplex mode (TDD) of time-division, the same propagation channel of transmit-receive sharing (frequency is also identical), can think that up propagation channel equals descending propagation channel in theory, and up channel and down channel have reciprocity.
One large advantage of TDD system is that up-downgoing channel obtains by reciprocity.Based on this channel reciprocity, transmitting terminal (such as base station) in TDD system can utilize the uplink pilot signal (as the uplink SRS signal in LTE system) that user sends to detect up channel, and then estimate to obtain down channel, and utilize smart antenna to carry out beamforming transmission based on this information.For example, the TM7 single-stream transmission pattern being widely adopted in TD-LTE system and TM8 stream transmission pattern are all to utilize the channel reciprocity of TDD system to carry out wave beam forming, thereby obtain figuration gain, improve transmission rate.
But in physics realization, the radio-frequency head of each antenna element needs two cover circuit to distinguish the sending and receiving of settling signal, as shown in Figure 1.Due to the fabrication error of hardware aspect, add amplifier nonlinearity distortion, the two cover circuit that are difficult to realize radio-frequency head have duplicate characteristic.In addition, the characteristic response of each radio circuit also changes along with the variation of environment (as temperature, humidity etc.) and time.Like this, from the impact on baseband signal, the sendaisle of antenna element i and receive path equivalence to signal times with different coefficients, i.e. Ti and Ri.This has caused the reciprocity of channel impaired.
Actual downstream channel H
dLfor:
H
DL＝R
UE·H·T
BS
And actual uplink channel H
uLfor:
H
UL＝R
BS·H
T·T
UE
And due to the inconsistent impact of transmitting-receiving path coefficient, cause H
dL≠ H
uL, channel reciprocity is no longer satisfied.
Therefore,, for the up channel that can utilize detection obtains descending channel information, need to calibrate the antenna element of base station end and user side.Its calibration target is to be multiplied by respectively a compensation for calibrating errors coefficient by the receipts passage of the antenna element at base station end and user side or a passage, so that the transceiver channel coefficient ratio of each antenna element is consistent after calibration.But in fact, the antenna mismatch of user side is limited on the descending preliminary treatment impact of base station end.Therefore, in reality, can only calibrate the approximate up-downgoing channel reciprocity that realizes to the antenna element of base station end.At present, in TD-SCDMA and TD-LTE system, the conventional inner self-alignment structure of RRU (radio frequency remoto module) as shown in Figure 2, wherein, calibrating signal processing unit can be positioned at BBU (indoor baseband processing unit) side, also can be positioned at RRU side.
Existing repeater is generally used in GSM, and due to the duplex mode of FDD frequency division that GSM adopts, so corresponding, the general employing of processing of the uplink and downlink signals of repeater is is independently received and dispatched path to process the signal of different frequency.But, if if the repeater in TD-LTE system still adopts traditional Fig. 1 structure, eNB(base station) and UE(client) between uplink and downlink signals passed through different transmitting-receiving paths, be that upward signal amplification regeneration is through up transmitting-receiving path, it is through descending transmitting-receiving path that downstream signal amplifies regeneration, due to its Circuit responce coefficient difference, cause the signal reciprocity of TDD no longer satisfied.But because repeater is transparent to network, eNB and UE do not know whether repeater has been installed in system.If eNB has used the transmission mode of TM7 single current wave beam forming or TM8 dual-stream beamforming, because the channel reciprocity of TDD system is now destroyed by repeater, cause cannot estimating accurately down channel according to up channel in base station side, thereby wave beam forming is inaccurate, the performance of TD-LTE can remarkable variation.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of wireless discharging-directly station and signal transmission method thereof, can meet the requirement of channel reciprocity in TD-LTE system.
For solving the problems of the technologies described above, embodiments of the invention provide a kind of wireless discharging-directly station, are applied to tdd communication systems, comprising:
Transmission channel, for transmitting the signal between base station and user terminal;
Control unit, is connected with described transmission channel, for according to the signal of described base station, determines the time slot proportion of described base station, and produces control command;
Switch element, be connected with described transmission channel, for being switched to the first state or the second state according to described control command, wherein, described the first state is to make described user terminal carry out the state of ascending time slot signal transmission, and described the second state is to make described base station carry out the state of descending time slot signal transmission.
Wherein, described transmission channel comprises:
The first transmission channel, is connected with the first antenna and the described control unit of described base station, for transmitting the signal between described base station and described user terminal;
The second transmission channel, is connected with the second antenna of described user terminal, for transmitting the signal between described user terminal and described base station.
Wherein, described switch element comprises:
The first switch, is connected with described the first transmission channel, for according to described control command, is switched to the state being connected with described base station or the state being connected with described user terminal;
Second switch, is connected with described the second transmission channel, for according to described control command, is switched to the state being connected with described user terminal or the state being connected with described base station.
Wherein, described control unit is specifically for the signal that receives described base station by described the first transmission channel, and determine the time slot proportion of described base station according to described signal, according to described time slot proportion, at the ascending time slot of described user terminal, produce the first control command, at the descending time slot of described base station, produce the second control command.
Wherein, described the first switch is specifically for according to described the first control command, be switched to the state being connected with the second antenna of described user terminal, described second switch, specifically for according to described the first control command, switches the state being connected with the first antenna of described base station;
Described the first transmission channel, specifically for by receiving from described user terminal the signal of coming, sends to described base station by described the second transmission channel.
Wherein, described the first switch is specifically for according to described the second control command, be switched to the state being connected with the first described antenna, described second switch, specifically for according to described the second control command, is switched to the state being connected with the second antenna of described user terminal;
Described the second transmission channel, specifically for by receive the signal of coming from described base station, sends to described user terminal by described the first transmission channel.
Embodiments of the invention also provide a kind of method of wireless discharging-directly station signal transmission, are applied to tdd communication systems, comprising:
Receive the signal of base station;
According to the time slot proportion of definite described base station of described base station, and produce control command;
According to described control command, switch element is switched to the first state or the second state, wherein, described the first state is to make described user terminal carry out the state of ascending time slot signal transmission, and described the second state is to make described base station carry out the state of descending time slot signal transmission;
Signal under signal by transmission channel transmitting switch unit under described the first state or described the second state.
Wherein, according to the time slot proportion of definite described base station of described base station, and the step that produces control command comprises:
At the ascending time slot of described user terminal, produce the first control command, at the descending time slot of described base station, produce the second control command.
Wherein, described switch element comprises: the first switch and second switch;
The step that switch element is switched to the first state or the second state according to described control command comprises:
According to described the first control command, control described the first switching over to the state that is connected with the second antenna of described user terminal, and control described second switch and switch the state being connected with the first antenna of described base station; Or
According to described the second control command, control described first day and close and be switched to the state being connected with the first described antenna, and control described second day pass and be switched to the state being connected with the second antenna of described user terminal.
Wherein, described transmission channel comprises: the first transmission channel and the second transmission channel;
The step of the signal under the signal by transmission channel transmitting switch unit under described the first state or described the second state comprises:
Receive the signal of described user terminal by described the first transmission channel, and by described the second transmission channel, the signal of described user terminal is sent to described base station; Or
Receive the signal of described base station by described the second transmission channel, and by described the first transmission channel, the signal of described base station is sent to described user terminal.
The beneficial effect of technique scheme of the present invention is as follows:
In such scheme of the present invention, by the state of control switch unit, change the operating state of transmission channel, thereby make uplink and downlink transfer share same transmission channel, make up-downgoing path there is the response coefficient of identical transmitting-receiving path, ensure the reciprocity of tdd communication systems, and energy simplified apparatus, reduce costs.
Brief description of the drawings
Fig. 1 is the structural representation of wireless discharging-directly station in prior art;
Fig. 2 is that in prior art, radio frequency remoto module is realized self-alignment structural representation;
Fig. 3 is the schematic diagram of the structure of wireless discharging-directly station in the present invention;
Fig. 4 is the schematic diagram of the concrete structure of wireless discharging-directly station of the present invention;
Fig. 5 is the schematic flow sheet of wireless discharging-directly station signal transmission method of the present invention.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
Embodiment 1
As shown in Figure 3, a kind of wireless discharging-directly station, is applied to tdd communication systems, comprising:
Transmission channel, for transmitting the signal between base station and user terminal;
Control unit, is connected with described transmission channel, for according to the signal of described base station, determines the time slot proportion of described base station, and produces control command;
Switch element, be connected with described transmission channel, for being switched to the first state or the second state according to described control command, wherein, described the first state is to make described user terminal carry out the state of ascending time slot signal transmission, and described the second state is to make described base station carry out the state of descending time slot signal transmission.
In the scheme of the present embodiment, control unit is by control switch unit, change the operating state of transmission channel, thereby make uplink and downlink transfer share same transmission channel, up-downgoing path has the response coefficient of identical transmitting-receiving path, ensure the reciprocity of tdd communication systems, and energy simplified apparatus, reduce costs.
Wherein, described transmission channel specifically comprises:
The first transmission channel, is connected with the first antenna and the described control unit of described base station, for transmitting the signal between described base station and described user terminal;
The second transmission channel, is connected with the second antenna of described user terminal, for transmitting the signal between described user terminal and described base station.
Described switch element specifically comprises:
The first switch, is connected with described the first transmission channel, for according to described control command, is switched to the state being connected with described base station or the state being connected with described user terminal;
Second switch, is connected with described the second transmission channel, for according to described control command, is switched to the state being connected with described user terminal or the state being connected with described base station.
Control unit receives the signal of described base station by described the first transmission channel, and determines the time slot proportion of described base station according to described signal, according to described time slot proportion, at the ascending time slot of described base station, produce the first control command, at the descending time slot of described base station, produce the second control command.
In the time will making described user terminal carry out the state of ascending time slot signal transmission, the first switch is according to described the first control command, be switched to the state being connected with the second antenna of described user terminal, second switch, according to described the first control command, switches the state being connected with the first antenna of described base station; Now the first transmission channel, specifically for by receiving from described user terminal the signal of coming, sends to described base station by described the second transmission channel.
In the time that the state of descending time slot signal transmission is carried out in described base station, described the first switch is according to described the second control command, be switched to the state being connected with the first described antenna, second switch, according to described the second control command, is switched to the state being connected with the second antenna of described user terminal; Now the second transmission channel, specifically for by receive the signal of coming from described base station, sends to described user terminal by described the first transmission channel.
Below wireless discharging-directly station is described in detail:
Taking the wireless discharging-directly station of single antenna as example (wireless discharging-directly station of many antennas can directly be analogized), the structural representation of the wireless discharging-directly station that the present embodiment proposes as shown in Figure 4.Consider the characteristic of only having at one time an one way link (up or descending) to transmit in TDD system, the wireless discharging-directly station that the present invention proposes only uses a set of transmitting-receiving path, only has one to receive passage and one passage.
Specifically, the functional unit of the wireless discharging-directly station that the present invention proposes mainly comprises four parts: receive passage (described the first transmission channel), send out passage (described the second transmission channel), control unit and switch element.
Wherein, receive passage and send out passage the signal reception that completes traditional wireless discharging-directly station, amplify regeneration and sending function, but at the present embodiment owing to only using a set of transmitting-receiving path, be that upward signal and downstream signal are all shared same transmitting-receiving path, therefore there is identical transmitting-receiving path response coefficient, thereby ensured the reciprocity requirement of tdd communication systems.
Control unit is to carrying out decoding by the signal from base station of receiving passage reception, thus the time slot proportion of the signal of definite base station, and then the switching time of definite up-downgoing transmission, and send control signaling to switch element, control switch carries out corresponding switch operating.
Changeable switch receives the control signal from decoding and control unit, and completes corresponding switch operating.
Specifically, in the time carrying out ascending time slot transmission, switch 2(is the second switch in Fig. 4 with sending out channel attached) be switched to the antenna (before described the first antenna) of base station, with to receive channel attached switch 1(be the first switch in Fig. 4) be switched to the antenna (before described in the second antenna) of user terminal, the antenna reception of user terminal is from user's upward signal, and by receiving passage, the antenna of sending out passage and base station sends to base station;
In the time carrying out descending time slot transmission, with the antenna of sending out switch 2 channel attached and be switched to user terminal, with receive channel attached switch 1 and be switched to the antenna of base station, be the antenna reception of base station from the downstream signal of base station, and by sending out a passage, the antenna of receiving passage and user terminal sends to user terminal.
The control unit of the present embodiment is by control switch unit in sum, change the operating state of transmission channel, thereby make uplink and downlink transfer share same transmission channel, make up-downgoing path there is the response coefficient of identical transmitting-receiving path, ensured the reciprocity of tdd communication systems; Further, owing to adopting a set of transmitting-receiving path, simplified equipment, thereby reduced costs.
Embodiment 2
A method for wireless discharging-directly station signal transmission, is applied to tdd communication systems, as shown in Figure 5, comprises the following steps:
Step 1, the signal of reception base station;
Step 2, according to the time slot proportion of definite described base station of described base station, and produces control command;
At the ascending time slot of described user terminal, produce the first control command, at the descending time slot of described base station, produce the second control command;
Step 3, according to described control command, switch element is switched to the first state or the second state, wherein, described the first state is to make described user terminal carry out the state of ascending time slot signal transmission, and described the second state is to make described base station carry out the state of descending time slot signal transmission;
Step 4, the signal under the signal by transmission channel transmitting switch unit under described the first state or described the second state.
Specifically, described switch element comprises: the first switch and second switch;
According to described the first control command, control described the first switching over to the state that is connected with the second antenna of described user terminal, and control described second switch and switch the state being connected with the first antenna of described base station; Or
According to described the second control command, control described first day and close and be switched to the state being connected with the first described antenna, and control described second day pass and be switched to the state being connected with the second antenna of described user terminal.
Described transmission channel comprises: the first transmission channel and the second transmission channel;
Receive the signal of described user terminal by described the first transmission channel, and by described the second transmission channel, the signal of described user terminal is sent to described base station; Or
Receive the signal of described base station by described the second transmission channel, and by described the first transmission channel, the signal of described base station is sent to described user terminal.
The control unit of the present embodiment, by control switch unit, changes the operating state of transmission channel, thereby makes uplink and downlink transfer share same transmission channel.In the time will making described user terminal carry out the state of ascending time slot signal transmission, according to described the first control command, control described the first switching over to the state being connected with the second antenna of described user terminal, form the first transmission channel, and control described second switch and switch the state being connected with the first antenna of described base station, form the second transmission channel, receive the signal of described user terminal by described the first transmission channel, and by described the second transmission channel, the signal of described user terminal is sent to described base station, thereby complete ascending time slot transmission; In the time will making described base station carry out the state of descending time slot signal transmission, can be according to described the second control command, control described first day and close the state being connected with the first described antenna that is switched to, form the first transmission channel, and control described second day and close and be switched to the state being connected with the second antenna of described user terminal, form the second transmission channel, receive afterwards the signal of described base station by described the second transmission channel, and by described the first transmission channel, the signal of described base station is sent to described user terminal, thereby complete descending time slot transmission.Thus, wireless discharging-directly station can adopt a set of transmitting-receiving path, and then has simplified equipment, thereby reduces costs, and has the response coefficient of identical transmitting-receiving path, has ensured the reciprocity of tdd communication systems.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a wireless discharging-directly station, is applied to tdd communication systems, it is characterized in that, comprising:
Transmission channel, for transmitting the signal between base station and user terminal;
Control unit, is connected with described transmission channel, for according to the signal of described base station, determines the time slot proportion of described base station, and produces control command;
Switch element, be connected with described transmission channel, for being switched to the first state or the second state according to described control command, wherein, described the first state is to make described user terminal carry out the state of ascending time slot signal transmission, and described the second state is to make described base station carry out the state of descending time slot signal transmission.
2. wireless discharging-directly station according to claim 1, is characterized in that, described transmission channel comprises:
The first transmission channel, is connected with the first antenna and the described control unit of described base station, for transmitting the signal between described base station and described user terminal;
The second transmission channel, is connected with the second antenna of described user terminal, for transmitting the signal between described user terminal and described base station.
3. wireless discharging-directly station according to claim 2, is characterized in that, described switch element comprises:
The first switch, is connected with described the first transmission channel, for according to described control command, is switched to the state being connected with described base station or the state being connected with described user terminal;
Second switch, is connected with described the second transmission channel, for according to described control command, is switched to the state being connected with described user terminal or the state being connected with described base station.
4. wireless discharging-directly station according to claim 3, it is characterized in that, described control unit is specifically for the signal that receives described base station by described the first transmission channel, and determine the time slot proportion of described base station according to described signal, according to described time slot proportion, at the ascending time slot of described user terminal, produce the first control command, at the descending time slot of described base station, produce the second control command.
5. wireless discharging-directly station according to claim 4, is characterized in that,
Described the first switch, specifically for according to described the first control command, is switched to the state being connected with the second antenna of described user terminal;
Described second switch, specifically for according to described the first control command, switches the state being connected with the first antenna of described base station;
Described the first transmission channel, specifically for by receiving from described user terminal the signal of coming, sends to described base station by described the second transmission channel.
6. wireless discharging-directly station according to claim 4, is characterized in that,
Described the first switch, specifically for according to described the second control command, is switched to the state being connected with the first described antenna;
Described second switch, specifically for according to described the second control command, is switched to the state being connected with the second antenna of described user terminal;
Described the second transmission channel, specifically for by receive the signal of coming from described base station, sends to described user terminal by described the first transmission channel.
7. a method for wireless discharging-directly station signal transmission, is applied to tdd communication systems, it is characterized in that, comprising:
Receive the signal of base station;
According to the time slot proportion of definite described base station of described base station, and produce control command;
According to described control command, the switch element of described wireless discharging-directly station is switched to the first state or the second state, wherein, described the first state is to make described user terminal carry out the state of ascending time slot signal transmission, and described the second state is to make described base station carry out the state of descending time slot signal transmission;
Signal under signal by transmission channel transmitting switch unit under described the first state or described the second state.
8. the method for wireless discharging-directly station signal transmission according to claim 7, is characterized in that, according to the time slot proportion of definite described base station of described base station, and the step that produces control command comprises:
At the ascending time slot of described user terminal, produce the first control command, at the descending time slot of described base station, produce the second control command.
9. the method for wireless discharging-directly station signal transmission according to claim 8, is characterized in that, described switch element comprises: the first switch and second switch;
The step that switch element is switched to the first state or the second state according to described control command comprises:
According to described the first control command, control described the first switching over to the state that is connected with the second antenna of described user terminal, and control described second switch and switch the state being connected with the first antenna of described base station; Or
According to described the second control command, control described first day and close and be switched to the state being connected with the first described antenna, and control described second day pass and be switched to the state being connected with the second antenna of described user terminal.
10. the method for wireless discharging-directly station signal transmission according to claim 9, is characterized in that, described transmission channel comprises: the first transmission channel and the second transmission channel;
The step of the signal under the signal by transmission channel transmitting switch unit under described the first state or described the second state comprises:
Receive the signal of described user terminal by described the first transmission channel, and by described the second transmission channel, the signal of described user terminal is sent to described base station; Or
Receive the signal of described base station by described the second transmission channel, and by described the first transmission channel, the signal of described base station is sent to described user terminal.
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| CN107819483B (en) * | 2017-11-02 | 2019-03-19 | 京信通信***（中国）有限公司 | Signal transmitting apparatus and its test equipment, repeater communication equipment |
| WO2019085556A1 (en) * | 2017-11-02 | 2019-05-09 | 京信通信***（中国）有限公司 | Signal transmission apparatus and test device thereof, and repeater communication device |
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