CN105337693A - Downlink signal pre-correcting and correcting method, device, system and related equipment - Google Patents
Downlink signal pre-correcting and correcting method, device, system and related equipment Download PDFInfo
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- CN105337693A CN105337693A CN201410400616.8A CN201410400616A CN105337693A CN 105337693 A CN105337693 A CN 105337693A CN 201410400616 A CN201410400616 A CN 201410400616A CN 105337693 A CN105337693 A CN 105337693A
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Abstract
The invention discloses a downlink signal pre-correcting and correcting method, a device, a system and related equipment and aims to realize downlink signal error pre-correction at a network side, help a terminal to realize downlink signal correcting and improve reception performance of a downlink signal. The terminal is notified by a base station to use a specific transmission mode to realize signal transmission. The downlink signal pre-correcting method comprises steps that, when an uplink signal sent by the terminal is received, uplink signal frequency offset of the terminal is acquired; when the downlink signal is sent to the terminal, pre-correcting processing on the downlink signal is carried out according to the uplink signal frequency offset, and the downlink signal at least comprises a DRS signal. A downlink signal correcting method comprises steps that, when the DRS signal sent by the network side is received, downlink signal frequency offset of the DRS signal is acquired; when the downlink signal sent by the network side is received, correcting processing on the downlink signal is carried out according to the downlink signal frequency offset.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to downstream signal in a kind of communication system and rectify a deviation in advance and method for correcting error, device, system and relevant device.
Background technology
When there is relative motion in communication system when between transmitter and receiver, due to Doppler effect, the signal frequency that transmitter sends by the signal frequency that receiver receives produces a deviation, is called Doppler frequency shift, and its computing formula is:
wherein c is the light velocity, f
0be carrier frequency, v is the relative moving speed between Receiver And Transmitter, and θ is the angle of receiver moving direction and signal propagation direction.
LTE (Long Term Evolution, LongTimeEvolution) in system, terminal is under high-speed mobile covering scene, because LTE carrier frequency is high, Doppler frequency shift absolute value is very large, as under LTE high ferro covering scene, and carrier frequency 2.6GHz, moving velocity of terminal 350km/h, Doppler frequency shift is maximum reaches 840Hz.Excessive Doppler frequency shift causes receiver performance sharply to worsen, and causes network throughput to decline, even affects accessing terminal to network.
Therefore, for High-speed Circumstance, prior art proposes following prioritization scheme:
One, base station side solution
1) base station adopts correction algorithm to carry out process to the upward signal that terminal sends and obtains upward signal frequency deviation, utilizes the upward signal correction obtained carrying out frequency compensation to during upward signal process, to improve upward signal receptivity;
2) utilizing the reciprocity of TDD (time division duplex, TimeDivisionDuplexing) system uplink downlink, rectifies a deviation to downlink signal in advance according to upward signal frequency deviation in base station.Terminal is according to the upward signal tranmitting frequency of downstream signal reception frequency adjustment oneself, then the upward signal of terminal transmission is with one times of Doppler shift, after eating dishes without rice or wine to propagate, can fold the Doppler frequency shift that doubles again when base station receives upward signal, the upward signal that namely base station receives has twice Doppler shift.As shown in Figure 1, be descending correction schematic diagram, suppose that base station detects that upward signal frequency deviation is for-2 △ f, then can infer that the frequency deviation of the downstream signal that terminal receives is for-△ f, adds the Doppler shift of+△ f in advance, namely presses f when base station sends downstream signal
0the frequency of+△ f sends downstream signal, then can ensure that the frequency deviation of the downstream signal that terminal receives is 0, thus improves user equipment downlink receptivity.
Two, end side solution
1) terminal adopts AFC (automatic frequency control, AutomaticFrequencyControl) technology, difference according to the local frequency detected and actual signal received power adjusts local oscillator, guarantee that local frequency is consistent with the actual signal power received, to improve downstream signal reception performance.2) downstream signal (as CRS signal) that terminal adopts correction algorithm to send base station carries out process and obtains downstream signal correction, carry out frequency compensation when processing downstream signal according to the downstream signal correction obtained, thus improve downstream signal reception performance further.
To sum up, in prior art, in base station side, up correction can be adopted to carry out process to improve upward signal receptivity to upward signal, in end side, descending correction and/or AFC technology can be adopted to carry out process to improve downstream signal reception performance to descending.
Under high speed covering scene, in order to avoid frequently switching the penalty caused, usual use cell combining technology, the multiple RRU (RadioRemoteUnit, Remote Radio Unit) being about to lay along highway/railway cascade up as a logic district to improve single coverage radius of cell.In this case, when terminal moves from a RRU overlay area to another RRU overlay area, because the signal propagation direction of two RRU received is contrary, accordingly, Doppler shift is contrary, thus affects user equipment downlink signal receiving performance.Especially in overlapping covering place of signal, the amplitude of two RRU signals that terminal receives is close, now terminal cannot make local frequency consistent with Received signal strength frequency by AFC technology, and the signal also cannot distinguishing two RRU is rectified a deviation respectively, therefore downstream signal reception performance severe exacerbation.As shown in Figure 2, it is that cell combining is across RRU Doppler shift saltus step schematic diagram.Suppose that network side obtains upward signal frequency deviation for+2 △ f according to each RRU according to the upward signal that terminal sends, according to the reciprocity row of the uplink and downlink signals of TDD system, can infer that user equipment downlink signal frequency deviation is △ f.Suppose that the tranmitting frequency of RRU2 and RRU3 transmission downstream signal is F, for RRU2, due to Doppler shift, the tranmitting frequency that terminal receives the downstream signal of RRU2 is F-△ f, and the tranmitting frequency of the downstream signal that the RRU3 received sends is F+ △ f.
Simultaneously, with TD-SCDMA (TimeDivision-SynchronousCodeDivisionMultipleAccess, TD SDMA) each user carries out demodulation difference with respective demodulated reference signal to the downstream signal received in system, LTE system small area sends unified CRS (Cell-specificReferenceSignal, cell common reference signal), each user in community carries out the demodulation, AFC, descending correction, measurement etc. of downstream signal based on the CRS received.If base station carries out descending pre-correction based on the upward signal frequency deviation of a certain user obtained to CRS, other subscriber channels can be caused to estimate, and inaccurate, AFC lost efficacy, measurement is inaccurate, and therefore the descending pre-correction of CRS cannot be carried out in base station for a certain user.And if the pre-correction of user data is only carried out in the descending pre-correction not carrying out CRS, the channel estimation results that terminal calculates based on CRS cannot be applicable to user data, can cause downstream signal demodulation failure.Therefore LTE system cannot carry out descending pre-correction usually, and that is, prior art cannot improve the receptivity of end side downstream signal by the pre-correction of base station side.
As can be seen here, based on prior art, the lifting of downstream signal performance and the guarantee terminal that places one's entire reliance upon is adjusted by AFC and/or descending correction, be limited by the disposal ability of terminal self, the fineness of AFC adjustment and/or descending correction is inadequate, on the other hand, under above-mentioned cell combining scene, the problem of the overlapping covered Doppler shift saltus step of RRU, relies on end side to carry out AFC adjustment and/or descending correction cannot solve.
Summary of the invention
The embodiment of the present invention provides a kind of downstream signal to rectify a deviation in advance and method for correcting error, device, system and relevant device, in order to realize rectifying a deviation in advance to downstream signal at network side, coordinates the downstream signal correction of terminal, improves the receptivity of downstream signal.
The embodiment of the present invention provides a kind of downstream signal pre-method for correcting error, and notification terminal uses specific transmission mode signal transmission, and described specific transmission mode at least comprises the transmission mode supporting to send DRS (Dedicated Reference Signal) DRS to described terminal;
Described method, comprising:
When receiving the upward signal that described terminal sends, obtain the upward signal frequency deviation of described terminal;
When needs send downstream signal for described terminal, to rectify a deviation in advance process to described downstream signal according to described upward signal frequency deviation, described downstream signal at least comprises DRS signal.
The embodiment of the present invention provides a kind of downstream signal pre-deviation correcting device, comprising:
Transmission mode dispensing unit, uses specific transmission mode signal transmission for notification terminal configuration, and described specific transmission mode at least comprises the transmission mode supporting to send DRS (Dedicated Reference Signal) DRS to described terminal;
Obtaining unit, for when receiving the upward signal that described terminal sends, obtaining the upward signal frequency deviation of described terminal;
Pre-correction processing unit, for when needs send downstream signal for described terminal, to rectify a deviation in advance process to described downstream signal according to described upward signal frequency deviation, described downstream signal comprises DRS signal, Physical Downlink Shared Channel PDSCH signal.
The embodiment of the present invention provides a kind of base station, comprises the pre-deviation correcting device of above-mentioned downstream signal.
The embodiment of the present invention provides a kind of downstream signal method for correcting error, comprising:
When receiving the DRS (Dedicated Reference Signal) DRS signal that network side sends, obtain the downstream signal frequency deviation of described DRS signal;
When receiving the downstream signal that described network side sends, according to described downstream signal frequency deviation, correction process is carried out to described downstream signal.
The embodiment of the present invention provides a kind of downstream signal pre-deviation correcting device, comprising:
Obtaining unit, for when receiving the DRS (Dedicated Reference Signal) DRS signal that network side sends, obtaining the downstream signal frequency deviation of described DRS signal;
Correction unit, for when receiving the downstream signal that described network side sends, carries out correction process according to described downstream signal frequency deviation to described downstream signal.
The embodiment of the present invention provides a kind of terminal, comprises above-mentioned downstream signal deviation correcting device.
The embodiment of the present invention provides a kind of downstream signal to rectify a deviation in advance and deviation-rectifying system comprises base station and terminal, wherein, is provided with the pre-deviation correcting device of above-mentioned downstream signal in described base station, is provided with above-mentioned downstream signal deviation correcting device in described terminal.
The downstream signal that the embodiment of the present invention provides is rectified a deviation and method for correcting error in advance, device, system and relevant device, at network side, notification terminal configures specific transmission mode signal transmission, wherein, specific transmission mode at least comprises the transmission mode supporting to send DRS signal to described terminal, like this, base station obtains the upward signal frequency deviation of terminal when receiving the upward signal that terminal sends, and to rectify a deviation in advance process to sent downstream signal based on this, the downstream signal sent at least comprises DRS signal, terminal can be rectified a deviation to the downstream signal received according to the DRS signal received.In end side, terminal is after receiving DRS signal, first corresponding downstream signal frequency deviation is obtained according to the DRS received, follow-up after receiving the downstream signal after pre-correction process, terminal can carry out correction process according to the downstream signal frequency deviation obtained to the downstream signal received, thus can promote the receptivity of downstream signal.On the other hand, to rectify a deviation in advance process to sent downstream signal owing to achieving at network side, thus on the basis of improving downstream signal performance, reduce terminal and to carry out rectifying a deviation to downstream signal the performance requirement of process.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in write specification, claims and accompanying drawing and obtain.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a part of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is in prior art, descending correction schematic diagram;
Fig. 2 is in prior art, and cell combining is across RRU Doppler shift saltus step schematic diagram;
Fig. 3 is in the embodiment of the present invention, and network side implements the implementing procedure schematic diagram of the pre-method for correcting error of downstream signal;
Fig. 4 is in the embodiment of the present invention, and cell combining is across RRU Doppler shift saltus step schematic diagram;
Fig. 5 is in the embodiment of the present invention, and end side implements the implementing procedure schematic diagram of downstream signal method for correcting error;
Fig. 6 is in the embodiment of the present invention, the structural representation of the pre-deviation correcting device of downstream signal;
Fig. 7 is in the embodiment of the present invention, the structural representation of downstream signal deviation correcting device;
Fig. 8 is in the embodiment of the present invention, and downstream signal is rectified a deviation and the structural representation of deviation-rectifying system in advance.
Embodiment
In LTE system, when adopting transmission mode corresponding to wave beam forming (namely under some transmission modes, beamforming technique can be utilized to send downstream signal for terminal), as port5 single current wave beam forming, when sending downstream signal, terminal transmitting terminal DRS (Dedicated Reference Signal) (DRS, DedicatedReferenceSignal) can be given in base station, terminal carries out the demodulation of downstream signal based on this, but terminal does not carry out AFC adjustment based on this.
But under terminal high-speed mobile context, moving velocity of terminal is fast on the one hand, channel information acquisition causes wave beam forming effect poor not in time, on the other hand, base station needs use 8 passage RRU to support beamforming technique, but to the base band processing capacity of base station, 8 passage RRU require that the very high cascade number that causes is less, under terminal high-speed mobile context, need to improve cell combining gain by increasing RRU cascade number, usual use 2 passage RRU covers, therefore usually beamforming technique is not used in terminal high-speed scene, base station also can not use for terminal the transmission mode that wave beam forming is corresponding.
In the embodiment of the present invention, utilize base station can send the characteristic of DRS signal to terminal under some specific transmission modes, under these transmission modes, terminal uses DRS signal to carry out the demodulation of downstream signal but not CRS signal, namely demodulated reference signal is now user class, namely DRS signal is send for each terminal, based on this, pre-correction and the correction of carrying out downstream signal is coordinated by network side and end side, achieve descending pre-correction in LTE system, both handling property requirement terminal being carried out to downstream signal correction had been reduced, turn improve downstream signal reception performance.
It should be noted that, the embodiment of the present invention is applicable in LTE and lte-a system, is particularly useful for base station in TD-LTE system and carries out in the application scenarios of pre-correction downstream signal.
Below in conjunction with Figure of description, the preferred embodiments of the present invention are described, be to be understood that, preferred embodiment described herein is only for instruction and explanation of the present invention, be not intended to limit the present invention, and when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
In the embodiment of the present invention, opening the community of descending pre-correction, base station is the specific transmission mode of terminal configuration, and notification terminal uses the AD HOC signal transmission of configuration.Preferably, base station can with terminal interaction RRC (wireless heterogeneous networks, in the process of RadioResourceControl) signaling, such as, base station terminal access procedure and terminal set up RRC be connected or in handoff procedure by issuing RRC reconfiguration message, notification terminal uses specific transmission mode signal transmission, wherein, these specific transmission modes at least comprise the transmission mode (TM that can send DRS signal to terminal, TransmissionMode), as being TM7 for the terminal configuration of Release8, terminal configuration for Release9 and higher protocol version is TM8 or TM9.
In follow-up business scheduling process, base station is fixed and is used the transmission mode for terminal configuration to send downstream signal, and in 36.213 agreement tables 7.1-5, select corresponding descending control information format (DCIformat according to the transmission mode for terminal configuration, DownlinkControlInformationFormat) schedule information is sent to user, the transmission means (TransmissionScheme) that in form 7.1-5, wave beam forming is corresponding is selected to send business datum on Physical Downlink Shared Channel (PDSCH, PhysicalDownlinkSharedChannel).As for TM7 user, use DCI1 form to send schedule information, use " Single-antennaport, port5 " transmission means to send PDSCH business datum.Concrete flow chart of data processing corresponding to transmission means, specifically can see 36.211 agreements by protocol definition.
Be based upon the transmission mode of terminal configuration, in the embodiment of the present invention, as shown in Figure 3, base station can be carried out downstream signal according to following steps and be rectified a deviation in advance:
S31, base station, when receiving the upward signal that terminal sends, obtain the upward signal frequency deviation of this terminal.
During concrete enforcement, base station can be, but not limited to use up correction algorithm to process the upward signal that terminal sends, and obtains the upward signal frequency deviation of user, is assumed to be+2 △ f.
, when needs send downstream signal for this terminal, to rectify a deviation process to downstream signal in advance according to the upward signal frequency deviation obtained in S32, base station.
Base station, when sending downstream signal to terminal, utilizes the upward signal frequency deviation obtained to rectify a deviation in advance process, by being multiplied by phase deviation e to sent downstream signal
(-△ is t f) for j2 π, its tranmitting frequency is adjusted to f
0-△ f.Wherein, the downstream signal that under base station, terminal sends at least comprises DRS signal.Due to the downstream signal that DRS is the user class for terminal, make terminal that downlink frequency offset algorithm can be utilized to obtain downstream signal frequency deviation according to the DRS signal received, and based on the downstream signal frequency deviation obtained, correction process is carried out, to promote downstream signal reception performance to the downstream signal received.It is desirable that, concrete enforcement is, base station can utilize the uplink frequency offset obtained to rectify a deviation in advance to sent downstream signals such as DRS and PDSCH (Physical Downlink Shared Channel), because base station side has carried out pre-correction to downstream signal, therefore, on the basis that can promote downstream signal reception performance, reduce end side and the performance requirement processed of rectifying a deviation is carried out to downstream signal.
It should be noted that, in the embodiment of the present invention, base station only processes the downstream signal of the user class sent for terminal when carrying out descending pre-correction process to sent downstream signal, as for the PDSCH (PhysicalDownlinkSharedChannel sent for terminal, Physical Downlink Shared Channel) and DRS signal to rectify a deviation in advance process, and for the downstream signal of cell-level, as CRS signal is not rectified a deviation process in advance.
During concrete enforcement, because DRS only just sends when adopting beamforming technique usually, therefore need support the transmission mode of wave beam forming for user configures and use corresponding transmission means.For under non-high-speed mobile context, when the transmission means that base station using beam figuration is corresponding is terminal transmission downstream signal, base station is passed through terminal uplink SRS (SoundingReferenceSignal, detection reference signal) signal process obtain beamformin coefficient, or obtain beamformin coefficient according to terminal feedback channel information, the forming coefficient of each terminal is different, and namely the forming coefficient of each terminal is user-level data.
And for the community that two passage RRU under high-speed mobile scene cover, because antenna number is less, cannot effective wave beam forming be carried out.Therefore, in the embodiment of the present invention, support the transmission mode of wave beam forming although be terminal configuration and use corresponding transmission means, but base station is when sending downstream signal for terminal, without the need to carrying out wave beam forming for terminal, and to the unified broadcast forming coefficient that uses of all terminals, namely base station uses broadcast forming coefficient to after the transmitting and be weighted process of each antenna in precoding process, downstream signal after terminal transmission processing, when that is needing to carry out descending pre-correction process under high-speed mobile scene, base station does not use the forming coefficient of user class (the above-mentioned beamformin coefficient obtained according to terminal uplink SRS or feedback signal information) when carrying out wave beam forming to terminal, the broadcast forming coefficient that unified use uses when sending broadcast, each terminal room indifference.
In the embodiment of the present invention, for cell combining scene, when even terminal is in the common coverage of the RRU of multiple cascade, because the Doppler frequency shift of each RRU receiving and transmitting signal may be different, therefore, when each RRU receives the upward signal of terminal transmission, for each RRU, up correction algorithm is utilized to obtain the upward signal frequency deviation of terminal pins to this RRU respectively, base station is when needs send downstream signal for terminal, respectively for each RRU, according to the upward signal frequency deviation of terminal pins to this RRU, this RRU to be rectified a deviation process in advance to the downstream signal that terminal sends.Like this, ensure that the frequency of the signal of each RRU that terminal receives is identical, thus both solved the problem of the overlapping covered Doppler shift saltus step of RRU, terminal can also utilize the space diversity gain of each RRU signal to promote downstream signal performance further.As shown in Figure 4, for embodiment of the present invention small area merges across RRU Doppler shift saltus step schematic diagram, suppose that network side obtains upward signal frequency deviation for+2 △ f according to each RRU according to the upward signal that terminal sends, according to the reciprocity row of the uplink and downlink signals of TDD system, can infer that user equipment downlink signal frequency deviation is △ f.
Suppose that the tranmitting frequency of RRU2 and RRU3 transmission downstream signal is F, for RRU2, its tranmitting frequency when sending from descending CRS to terminal is F (process of not rectifying a deviation in advance), the tranmitting frequency sending DRS signal and PDSCH signal is be then F+ △ f, for RRU3, because its signal propagation direction is different from RRU2, its tranmitting frequency when sending from descending CRS to terminal is F (process of not rectifying a deviation in advance), the tranmitting frequency sending DRS signal and PDSCH signal is be then F-△ f, in end side, the downstream signal that end-on receives is rectified a deviation, RRU2 and RRU3 is that the frequency of terminal transmission CRS signal is F, the descending CRS signal frequency that the RRU2 that then terminal receives sends is F-△ f, the descending CRS signal frequency that the RRU3 that terminal receives sends is F+ △ f, the DRS signal that RRU2 and RRU3 received sends and PDSCH signal frequency are F.
During concrete enforcement, because base station may not be terminal scheduling resource when terminal traffic is sparse for a long time, as terminal does not receive DRS for a long time, thus cause terminal AFC technological adjustment local frequency cannot be adopted consistent with actual signal (as the DRS signal) frequency received based on DRS signal, make tracking in time Doppler shift to change, and then affect downstream signal reception performance.
In order to solve the problem, in the embodiment of the present invention, descending keep-alive scheduling is carried out by periodically sending between DRS signal and terminal to terminal in base station.
Concrete, base station is each terminal maintenance timer.Send after downstream signal to terminal in base station, start or restart timer.If do not send downstream signal to terminal within the scope of the effective duration of timer, then after timer expiry, send DRS signal to terminal; If sent downstream signal to terminal within the scope of the effective duration of timer, then, after transmission downstream signal, restarted timer.Effective duration of timer can be obtained by terminal capabilities test, and can configure.
Accordingly, in end side, terminal receive base station rectify a deviation in advance process after downstream signal after, need to carry out correction process to the downstream signal received, because descending pre-correction is only carried out for PDSCH and DRS in base station, therefore, in the downstream signal that terminal receives, the frequency deviation of CRS may be different with the frequency deviation of DRS.
As shown in Figure 5, the downstream signal method for correcting error that the embodiment of the present invention provides can comprise the following steps:
S51, terminal, when receiving the DRS signal that network side sends, obtain the downstream signal frequency deviation of the DRS signal received.
Preferably, terminal, when receiving the DRS signal that network side sends, can utilize descending correction algorithm to obtain the downstream signal frequency deviation of the DRS signal received.
S52, terminal, when receiving the downstream signal that network side sends, carry out correction process according to the downstream signal frequency deviation obtained to the downstream signal received.
Wherein, the downstream signal that terminal receives is that network side obtains after downstream signal carries out pre-correction process according to the upward signal frequency deviation obtained, and upward signal frequency deviation is that network side utilizes up correction algorithm to obtain according to the upward signal received.
During concrete enforcement, terminal, can also according to the deviation adjusting local frequency of DRS signal frequency with local frequency after reception DRS signal, and maintenance local frequency is consistent with DRS frequency.By obtaining downstream signal frequency deviation to the process of DRS signal during terminal demodulates, and based on this, compensate of frequency deviation is carried out to follow-up DRS signal and PDSCH signal.
Similar with network side, in order to avoid terminal is when business is sparse, do not carry out scheduling to terminal because base station is long-time to make the change of tracking in time Doppler shift to cause downstream signal reception hydraulic performance decline, in the embodiment of the present invention, terminal also can safeguard a timer.Start when receiving the DRS signal that base station sends or restart timer, if when not receiving the DRS signal that network side (i.e. base station) sends within the scope of the effective duration of timer, then after timer expiry, according to CRS (public reference signal), correction process is carried out to the downstream signal received.Concrete, terminal utilizes descending correction algorithm to obtain the downstream signal frequency deviation of the CRS signal received; When receiving the downstream signal that network side sends, according to the downstream signal frequency deviation obtained, correction process is carried out to the downstream signal received.If when receiving the DRS signal of network side transmission within the scope of the effective duration of timer, then restart timer.
In the embodiment of the present invention, the pre-correction of base station to downstream signal is realized to the DRS signal that terminal sends by base station, terminal only needs the downstream signal to base station has been carried out after pre-correction process to carry out AFC adjustment and/or descending correction, greatly reduce the performance requirement carrying out needed for AFC adjustment and/or descending correction to terminal, effectively improve downstream signal reception performance.
Based on same inventive concept, the equipment and the downstream signal that also each provide the pre-deviation correcting device of a kind of downstream signal and downstream signal deviation correcting device and correspondence thereof in the embodiment of the present invention are rectified a deviation and deviation-rectifying system in advance, the principle of dealing with problems due to said apparatus, equipment and system rectify a deviation in advance to downstream signal and method for correcting error similar, therefore the enforcement of said apparatus, equipment and system see the enforcement of method, can repeat part and repeats no more.
As shown in Figure 6, be the structural representation of the pre-deviation correcting device of downstream signal that the embodiment of the present invention provides, comprise:
Transmission mode dispensing unit 61, uses specific transmission mode signal transmission for notification terminal, and described specific transmission mode at least comprises the transmission mode supporting to send DRS (Dedicated Reference Signal) DRS to described terminal;
Obtaining unit 62, for when receiving the upward signal that described terminal sends, obtaining the upward signal frequency deviation of described terminal;
Pre-correction processing unit 63, for when needs send downstream signal for described terminal, to rectify a deviation process to described downstream signal in advance according to described upward signal frequency deviation.
During concrete enforcement, if when terminal is positioned at the common coverage of the RRU of multiple cascade, described acquisition unit 62, specifically for receive at each RRU described terminal send upward signal time, for each RRU, up correction algorithm is utilized to obtain the upward signal frequency deviation of described terminal pins to this RRU respectively; Described pre-correction processing unit 63, specifically for when needs send downstream signal for described terminal, respectively for each RRU, according to the upward signal frequency deviation of described terminal pins to this RRU, to rectify a deviation process to the downstream signal that described terminal sends in advance to this RRU.
During concrete enforcement, the pre-deviation correcting device of the downstream signal that the embodiment of the present invention provides, transmitting element can also be comprised, after pre-correction process being carried out to described downstream signal at described pre-correction processing unit 63, after using the downstream signal after that broadcast forming coefficient sends each antenna, pre-correction process to be weighted process, send described downstream signal to described terminal.
During concrete enforcement, the pre-deviation correcting device of the downstream signal that the embodiment of the present invention provides, can also comprise timer management unit, at described transmitting element to after described terminal sends described downstream signal, start timer; And within the scope of the effective duration of timer, whether monitor described transmitting element to described terminal transmission downstream signal; If not, then after described timer expiry, trigger described transmitting element and send DRS signal to described terminal; If so, then after described transmitting element sends downstream signal, described timer is restarted; Described transmitting element, also for sending DRS signal to described terminal under the triggering of described timer.
For convenience of description, above each several part is divided into each module (or unit) according to function and describes respectively.Certainly, the function of each module (or unit) can be realized in same or multiple software or hardware when implementing of the present invention.
During concrete enforcement, the pre-deviation correcting device of the downstream signal that the embodiment of the present invention provides can be arranged in a base station, is realized rectifying a deviation in advance process to sent downstream signal by base station.
As shown in Figure 7, be the downstream signal deviation correcting device that the embodiment of the present invention provides, comprise:
Obtaining unit 71, for when receiving the DRS (Dedicated Reference Signal) DRS signal that network side sends, obtaining the downstream signal frequency deviation of described DRS signal;
Correction unit 72, for when receiving the downstream signal that described network side sends, carries out correction process according to described downstream signal frequency deviation to described downstream signal.
During concrete enforcement, the downstream signal deviation correcting device that the embodiment of the present invention provides can also comprise timer management unit, for when receiving the DRS (Dedicated Reference Signal) DRS signal that network side sends, starts timer; And whether monitoring receives the DRS signal of described network side transmission within the scope of the effective duration of described timer; If so, then described timer is restarted; If not, then after described timer expiry, trigger described correction unit, according to public reference signal CRS, correction process is carried out to the downstream signal received.
During concrete enforcement, the downstream signal deviation correcting device that the embodiment of the present invention provides can also comprise local frequency adjustment unit, for when receiving the DRS (Dedicated Reference Signal) DRS signal that network side sends, according to the described frequency of DRS signal and the deviation of local frequency, adjustment local frequency is consistent with the frequency of described DRS signal.
For convenience of description, above each several part is divided into each module (or unit) according to function and describes respectively.Certainly, the function of each module (or unit) can be realized in same or multiple software or hardware when implementing of the present invention.
During concrete enforcement, the downstream signal deviation correcting device that the embodiment of the present invention provides can be arranged in the terminal, carries out correction process by base station to the downstream signal received.
As shown in Figure 8, the downstream signal provided for the embodiment of the present invention is rectified a deviation and the structural representation of deviation-rectifying system in advance, comprises base station 81 and terminal 82, wherein, in base station 81, equipment has the pre-deviation correcting device of above-mentioned downstream signal, is provided with above-mentioned downstream signal deviation correcting device in terminal 82.
The downstream signal that the embodiment of the present invention provides is rectified a deviation and method for correcting error in advance, device, system and relevant device, at network side, base station notification terminal uses specific transmission mode signal transmission, wherein, specific transmission mode at least comprises the transmission mode supporting to send DRS signal to described terminal, like this, base station is when receiving the upward signal that terminal sends, the upward signal frequency deviation of terminal can be obtained, and to rectify a deviation in advance process to sent downstream signal based on this, the downstream signal sent at least comprises DRS signal, terminal can be rectified a deviation to the downstream signal received according to the DRS signal received.In end side, terminal is after receiving DRS signal, first corresponding downstream signal frequency deviation is obtained according to the DRS received, follow-up after receiving the downstream signal after pre-correction process, terminal can carry out correction process according to the downstream signal frequency deviation obtained to the downstream signal received, thus can promote the receptivity of downstream signal.On the other hand, to rectify a deviation in advance process to sent downstream signal owing to achieving at network side, thus improve on the basis of downstream signal performance, reduce terminal and to carry out rectifying a deviation to downstream signal the performance requirement of process.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (17)
1. the pre-method for correcting error of downstream signal, is characterized in that, notification terminal uses specific transmission mode signal transmission, and described specific transmission mode at least comprises the transmission mode supporting to send DRS (Dedicated Reference Signal) DRS to described terminal;
Described method, comprising:
When receiving the upward signal that described terminal sends, obtain the upward signal frequency deviation of described terminal;
When needs send downstream signal for described terminal, to rectify a deviation in advance process to described downstream signal according to described upward signal frequency deviation, described downstream signal at least comprises DRS signal.
2. the method for claim 1, it is characterized in that, if when described terminal is positioned at the common coverage of the radio frequency remote unit RRU of multiple cascade, when receiving the upward signal that described terminal sends, utilize up correction algorithm to obtain the upward signal frequency deviation of described terminal, comprising:
When each RRU receives the upward signal of described terminal transmission, for each RRU, up correction algorithm is utilized to obtain the upward signal frequency deviation of described terminal pins to this RRU respectively; And
When needs send downstream signal for described terminal, according to described upward signal frequency deviation, the downstream signal sent is rectified a deviation process in advance, comprising:
When needs send downstream signal for described terminal, respectively for each RRU, according to the upward signal frequency deviation of described terminal pins to this RRU, this RRU to be rectified a deviation process in advance to the downstream signal that described terminal sends.
3. method as claimed in claim 1 or 2, is characterized in that, for the community that two passage RRU cover, after described downstream signal being carried out to pre-correction process, also comprises:
After using the downstream signal after that broadcast forming coefficient sends each antenna, pre-correction process to be weighted process, send the downstream signal after weighting process to described terminal.
4. method as claimed in claim 3, is characterized in that, after sending described downstream signal to described terminal, also comprise:
Start timer, if do not send downstream signal to described terminal within the scope of the effective duration of described timer, then after described timer expiry, send DRS signal to described terminal;
If sent downstream signal to described terminal within the scope of the effective duration of described timer, then, after transmission downstream signal, restarted described timer.
5. the pre-deviation correcting device of downstream signal, is characterized in that, comprising:
Transmission mode dispensing unit, uses specific transmission mode signal transmission for notification terminal, and described specific transmission mode at least comprises the transmission mode supporting to send DRS (Dedicated Reference Signal) DRS to described terminal;
Obtaining unit, for when receiving the upward signal that described terminal sends, obtaining the upward signal frequency deviation of described terminal;
Pre-correction processing unit, for when needs send downstream signal for described terminal, to rectify a deviation in advance process to described downstream signal according to described upward signal frequency deviation, described downstream signal at least comprises DRS signal/Physical Downlink Shared Channel PDSCH signal.
6. device as claimed in claim 5, is characterized in that, if when described terminal is positioned at the common coverage of the radio frequency remote unit RRU of multiple cascade,
Described acquisition unit, specifically for receive at each RRU described terminal send upward signal time, for each RRU, utilize up correction algorithm to obtain the upward signal frequency deviation of described terminal pins to this RRU respectively;
Described pre-correction processing unit, specifically for when needs send downstream signal for described terminal, respectively for each RRU, according to the upward signal frequency deviation of described terminal pins to this RRU, to rectify a deviation process to the downstream signal that described terminal sends in advance to this RRU.
7. the device as described in claim 5 or 6, is characterized in that, also comprises:
Transmitting element, for the community covered for two passage RRU, after described pre-correction processing unit carries out pre-correction process to described downstream signal, after using the downstream signal after that broadcast forming coefficient sends each antenna, pre-correction process to be weighted process, send the downstream signal after weighting process to described terminal.
8. device as claimed in claim 7, is characterized in that, also comprise timer management unit, wherein:
Timer management unit, at described transmitting element to after described terminal sends described downstream signal, start timer; And within the scope of the effective duration of timer, whether monitor described transmitting element to described terminal transmission downstream signal; If not, then after described timer expiry, trigger described transmitting element and send DRS signal to described terminal; If so, then after described transmitting element sends downstream signal, described timer is restarted;
Described transmitting element, also for sending DRS signal to described terminal under the triggering of described timer.
9. a base station, is characterized in that, comprises the device described in the arbitrary claim of claim 6 ~ 9.
10. a downstream signal method for correcting error, is characterized in that, comprising:
When receiving the DRS (Dedicated Reference Signal) DRS signal that network side sends, obtain the downstream signal frequency deviation of described DRS signal;
When receiving the downstream signal that described network side sends, according to described downstream signal frequency deviation, correction process is carried out to described downstream signal.
11. methods as claimed in claim 10, is characterized in that, when receiving the DRS (Dedicated Reference Signal) DRS signal that network side sends, also comprise:
Start timer, if when receiving the DRS signal of described network side transmission within the scope of the effective duration of described timer, then restart described timer;
If when not receiving the DRS signal of described network side transmission within the scope of the effective duration of described timer, then after described timer expiry, according to public reference signal CRS, correction process is carried out to the downstream signal received.
12. methods as claimed in claim 10, is characterized in that, when receiving the DRS (Dedicated Reference Signal) DRS signal that network side sends, also comprise:
According to the described frequency of DRS signal and the deviation of local frequency, adjustment local frequency is consistent with the frequency of described DRS signal.
13. 1 kinds of downstream signal deviation correcting devices, is characterized in that, comprising:
Obtaining unit, for when receiving the DRS (Dedicated Reference Signal) DRS signal that network side sends, obtaining the downstream signal frequency deviation of described DRS signal;
Correction unit, for when receiving the downstream signal that described network side sends, carries out correction process according to described downstream signal frequency deviation to described downstream signal.
14. devices as claimed in claim 13, is characterized in that, also comprise:
Timer management unit, for when receiving the DRS (Dedicated Reference Signal) DRS signal that network side sends, starts timer; And whether monitoring receives the DRS signal of described network side transmission within the scope of the effective duration of described timer; If so, then described timer is restarted; If not, then after described timer expiry, trigger described correction unit, according to public reference signal CRS, correction process is carried out to the downstream signal received.
15. devices as claimed in claim 13, is characterized in that, also comprise:
Local frequency adjustment unit, for when receiving the DRS (Dedicated Reference Signal) DRS signal that network side sends, according to the described frequency of DRS signal and the deviation of local frequency, adjustment local frequency is consistent with the frequency of described DRS signal.
16. 1 kinds of terminals, is characterized in that, comprise the device described in claim 13,14 or 15.
17. 1 kinds of downstream signals are rectified a deviation and deviation-rectifying system in advance, it is characterized in that, comprise base station and terminal, wherein, be provided with the device of claim requirement described in 5 ~ 8 arbitrary claims in described base station, in described terminal, be provided with the device described in claim 13,14 or 15.
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