CN103873394B - A kind of method and apparatus for being used to carry out offset estimation based on TDD special subframes - Google Patents
A kind of method and apparatus for being used to carry out offset estimation based on TDD special subframes Download PDFInfo
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Abstract
It is an object of the invention to provide a kind of method and apparatus for being used to carry out offset estimation based on TDD special subframes, eNB is extracted in most latter two sign bit for the TDD special subframes being received from transmitted by user equipment and is inquired after reference signal for carry out offset estimation two；Reference signal is inquired after according to described two, offset estimation is carried out to the up channel of the user equipment to eNB.Compared with prior art, most latter two sign bit that the present invention passes through TDD special subframes, reference signal is inquired after using two for carrying out offset estimation, offset estimation is carried out to the up channel of user equipment to eNB so that when there is no uplink data transmission, can still carry out offset estimation, further, when there is uplink data transmission, offset estimation is carried out with reference to physical uplink link shared channels demodulated reference signal so that PUCCH and SRS channel estimations are more accurate.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of it is used to carry out offset estimation based on TDD special subframes
Technology.
Background technology
In wireless channel, there is time variation in wireless channel, and frequency shift (FS), example occurs in wireless signal in transmitting procedure
Such as Doppler frequency shift, or due to there is frequency departure between transmitter carrier frequency and receiver local oscillator, these can all cause
Orthogonality between subcarrier is destroyed, and causes interfering between subchannel.
In the up processing of LTE of physical layer, carrier frequency offset (Carrier FrequencyOffset, CFO) is thing
Manage uplink control channel (Physical Uplink ControlChannel, PUCCH) and inquire after reference signal
The important parameter of (Sounding Reference Signal, SRS).In the prior art, only with uplink data transmission
When calculate CFO, such as according to physical uplink link shared channels (Physical Uplink Shared Channel, PUSCH) solve
Reference signal (Demodulation Reference Signal, DMRS) is adjusted to estimate CFO；When no uplink data is passed
When defeated, usually using the CFO values of initial CFO assignment, rather than estimation.If CFO is not large enough to influence signal, PUCCH
It can not be influenceed with SRS channel estimation by CFO.Otherwise, it can influence very big using initial CFO assignment.
Therefore, when there is no uplink data transmission, particularly with pace of change and unusual frequency sensitivity
(frequency-sensitive) communication system, estimates carrier frequency offset, in up channel processing, such as PUCCH
Be very important in SRS channel estimations.
The content of the invention
It is an object of the invention to provide a kind of method and apparatus for being used to carry out offset estimation based on TDD special subframes.
According to an aspect of the invention, there is provided a kind of be used to carry out offset estimation based on TDD special subframes in the enb
Method, wherein, this method comprises the following steps：
A is in most latter two sign bit for the TDD special subframes being received from transmitted by user equipment, and extracting is used for into line frequency
Two estimated partially inquire after reference signal；
B inquires after reference signal according to described two, and offset estimation is carried out to the up channel of the user equipment to eNB.
According to another aspect of the present invention, additionally provide a kind of auxiliary that is used in a user device and be based on the special sons of TDD
The method that frame carries out offset estimation, wherein, this method comprises the following steps：
A is received from the context configuring request transmitted by eNB；
B is returned above and below corresponding with the context configuring request according to the context configuring request to the eNB
Literary configuration response；
C is according to the context configuring request, in most latter two sign bit of TDD special subframes, is sent to the eNB
Two for carrying out offset estimation are inquired after reference signal；
Wherein, the context configuring request includes following at least any one：
The cycle information of reference signal is inquired after described in-transmission；
The time-domain position information of reference signal is inquired after described in-transmission；
The frequency domain position information of reference signal is inquired after described in-transmission.
According to a further aspect of the invention, a kind of be used for based on TDD special subframes progress offset estimation is additionally provided
ENB, wherein, the eNB includes：
Signal extracting device, for most latter two sign bit in the TDD special subframes being received from transmitted by user equipment
In, extract and inquire after reference signal for carry out offset estimation two；
Frequency deviation estimation device, for inquiring after reference signal according to described two, to the up letter of the user equipment to eNB
Road carries out offset estimation.
According to a further aspect of the invention, a kind of auxiliary that is used for is additionally provided based on TDD special subframes progress frequency deviation to estimate
The user equipment of meter, wherein, the user equipment includes：
Reception device is asked, for the context configuring request being received from transmitted by eNB；
Return mechanism is responded, for according to the context configuring request, returning and being configured with the context to the eNB
The corresponding context configuration response of request；
Sender unit, for according to the context configuring request, in most latter two sign bit of TDD special subframes
In, sent to the eNB and inquire after reference signal for carry out offset estimation two；
Wherein, the context configuring request includes following at least any one：
The cycle information of reference signal is inquired after described in-transmission；
The time-domain position information of reference signal is inquired after described in-transmission；
The frequency domain position information of reference signal is inquired after described in-transmission.
According to a further aspect of the invention, a kind of be used for based on TDD special subframes progress offset estimation is additionally provided
System, including eNB described above and user equipment described above.
Compared with prior art, most latter two sign bit of the invention by TDD special subframes, using for carrying out frequency deviation
Two of estimation inquire after reference signal, carry out offset estimation to the up channel of user equipment to eNB so that when no uplink
When circuit-switched data is transmitted, offset estimation can be still carried out, further, when there is uplink data transmission, with reference to physical uplink
Link shared channels demodulated reference signal carries out offset estimation so that PUCCH and SRS channel estimations are more accurate.
Brief description of the drawings
By reading the detailed description made to non-limiting example made with reference to the following drawings, of the invention is other
Feature, objects and advantages will become more apparent upon：
Fig. 1 shows the method flow for being used to carry out offset estimation based on TDD special subframes according to one aspect of the invention
Figure；
Fig. 2 shows to carry out the schematic diagram of offset estimation in the prior art；
Fig. 3 show in accordance with a preferred embodiment of the present invention be used for offset estimation carried out based on TDD special subframes shown
It is intended to；
Fig. 4 shows being used for based on TDD special subframes progress offset estimation according to another preferred embodiment of the present invention
Schematic flow sheet；
Fig. 5 shows that the equipment based on TDD special subframes progress offset estimation that is used for according to a further aspect of the present invention is shown
It is intended to.
Same or analogous reference represents same or analogous part in accompanying drawing.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 shows the method stream for being used to carry out offset estimation based on TDD special subframes according to a further aspect of the present invention
Cheng Tu.
In step S101, most latter two sign bit of eNB in the TDD special subframes being received from transmitted by user equipment
In, extract and inquire after reference signal for carry out offset estimation two.Specifically, in the LTE up processing of physical layer, carrier wave
Frequency offset (CFO) is physical uplink control channel (PUCCH) and the important parameter for inquiring after reference signal (SRS).It is existing
In technology, CFO only is calculated when with uplink data transmission, when there is no uplink data transmission, usually using just
Beginning CFO assignment, rather than CFO estimates.In order to there is an accurate channel estimation to PUCCH and SRS, the present invention proposes one
Kind for carry out offset estimation two inquire after reference signal by being added in TDD special subframes and estimate CFO method.By
It is sent periodically in the reference signal of inquiring after for being used to carry out offset estimation, and it is not multiple to inquire after the processing of reference signal
It is miscellaneous, there may be time-domain resource calculate CFO, therefore, can be used to carrying out offset estimation periodically with this inquires after reference
Signal of change CFO.In addition, when there is uplink data transmission, can be combined with Physical Uplink Shared Channel demodulation reference letter
Number calculate CFO value, i.e. carry out offset estimation.
For example, user equipment inquires after the week of reference signal according to transmission included in the context configuring request received
Phase information, time-domain position information, frequency domain position information etc., being put into most latter two sign bit of TDD special subframes is used for
Carry out offset estimation two inquire after reference signal, and the TDD special subframes are sent to eNB, and the eNB is received from user equipment
The TDD special subframes of transmission, and in most latter two sign bit of the TDD special subframes, extracting this is used to carry out offset estimation
Two inquire after reference signal.
Here, have 10 wireless sub-frames in a radio frames, wherein, there is one or two special in 10 wireless sub-frames
Subframe, the length of the special subframe is consistent with the length of other wireless sub-frames, is a TTI, i.e. 1ms.
In step s 102, eNB inquires after reference signal according to described two, to the up letter of the user equipment to eNB
Road carries out offset estimation.
Specifically, as shown in Fig. 2 in the prior art, when with uplink data transmission, being shared according to physical uplink
Channel demodulated reference signal estimates CFO value, i.e. carry out offset estimation, usually using the pilot tone of adjacent time-slots in a subframe
Symbol carries out offset estimation.Here, there is 7 sign bits in a time slot, front and rear respectively to have 3 data symbols, middle 1 is pilot tone
Symbol.
The signal that eNB is received is as follows：
Therefore, offset estimation
The frequency deviation region that the algorithm is estimated is [- Δ εmax, Δ εmax], wherein,
That is,Corresponding to ± 1000Hz.
As shown in figure 3, in the present invention, in step s 102, the eNB inquires after reference signal according to this two, to the user
Equipment to the up channel of the eNB carries out offset estimation.The eNB inquires after the time domain conjugate multiplication of reference signal to enter by this two
Row offset estimation, as carried out offset estimation using algorithm identical algorithm shown in Fig. 2, but used is that the TDD is special
Inquire after reference signal in most latter two sign bit of subframe, rather than using Physical Uplink Shared Channel demodulated reference signal come
Carry out offset estimation.
Here, only needing modification
Certainly, also offset estimation can be carried out using other CFO algorithm for estimating herein, such as by system emulation, for the eNB
A kind of suitable CFO algorithm for estimating is selected, such as selects a kind of CFO of balance that can reach between accuracy and complexity to estimate to calculate
Method.Those skilled in the art will be understood that above-mentioned algorithm is only for example, and other algorithms that are existing or being likely to occur such as are applicable to
The present invention, should also be included within the scope of the present invention, and be incorporated herein by reference herein.
In a preferred embodiment, the eNB sends context configuring request to the user equipment；The user equipment is received
From the context configuring request transmitted by the eNB；According to the context configuring request, to the eNB return with it is described above and below
The corresponding context configuration response of literary configuring request；The eNB is received from the context configuration sound that the user equipment is returned
Should, wherein, the context configuration response is corresponding with the context configuring request；And then, the user equipment is according on this
Hereafter configuring request, in most latter two sign bit of TDD special subframes, sends for carrying out offset estimation to the eNB
Two are inquired after reference signal；The eNB in most latter two sign bit for the TDD special subframes being received from transmitted by user equipment,
Extract and inquire after reference signal for carry out offset estimation two；Reference signal is inquired after according to described two, the user is set
The up channel of eNB to the utmost carries out offset estimation；Wherein, the context configuring request includes following at least any one：
The cycle information of reference signal is inquired after described in-transmission；
The time-domain position information of reference signal is inquired after described in-transmission；
The frequency domain position information of reference signal is inquired after described in-transmission.
For example, as shown in figure 4, the base-band resource controller (Band ResourceController, BRC) in eNB is distinguished
Context configuring request is sent to user equipment, physical layer function entity (Physical Layer) and ascending resource scheduling device
(UL Scheduler), with notify three entities send for carry out offset estimation the cycle information for inquiring after reference signal,
Time-domain position information, frequency domain position information etc.；The user equipment, physical layer function entity and ascending resource scheduling device are respectively to this
Base-band resource controller feedback acknowledgment is responded；The base-band resource controller receives the confirmation sound that three entities are returned respectively
Should；And then, the user equipment is estimated according to the context configuring request according to transmission included in the request for carrying out frequency deviation
That counts inquires after cycle information, time-domain position information, frequency domain position information of reference signal etc., last the two of TDD special subframes
In individual sign bit, this is added for carrying out two of offset estimation and inquires after reference signal, and the TDD special subframes are sent to this
eNB。
Here, eNB sends context configuring request, indicate that each user equipment is sent and inquire after reference for offset estimation
The cycle of signal and time-frequency location, its from common to inquire after reference signal context configuring request different.Sending this is used for frequency deviation
The default value cycle for inquiring after reference signal of estimation is, for example, 5ms or 10ms.There are 10 wireless sub-frames in one radio frames, its
In, there are one or two special subframe, the length of the special subframe and the length of other wireless sub-frames in 10 wireless sub-frames
Unanimously, it is a TTI, i.e. 1ms.It should be noted that only considering the special subframe configuration of UpPTS length more than two sign bits herein.
Preferably, this method also includes step S103 (not shown), in step S103, and eNB is shared in up-link
In channel, the demodulated reference signal that the user equipment is sent is received from；Then, in step s 102, eNB is inquired after according to
Reference signal, and with reference to the demodulated reference signal, the up channel progress frequency deviation to the user equipment to the eNB is estimated
Meter.
Specifically, when can not carry out offset estimation due to no uplink data transmission, sent using periodicity
For carrying out inquiring after reference signal and estimating that CFO is a kind of important supplement to prior art for offset estimation.But due to upper
Uplink data transmission is frequent, and the interval that CFO is calculated is shorter, therefore, using Physical Uplink Shared Channel demodulated reference signal
CFO obtained by calculating is more accurate.Therefore, when there is uplink data transmission, eNB estimates according to this two for carrying out frequency deviation
That counts inquires after reference signal, and combines the demodulated reference signal, and the up channel progress frequency deviation to the user equipment to the eNB is estimated
Meter.For example, in step S101, most latter two sign bit of the eNB in the TDD special subframes being received from transmitted by user equipment
In, extract and inquire after reference signal for carry out offset estimation two；In step s 103, the eNB is in the shared letter of up-link
In road, the demodulated reference signal of user equipment transmission is received from；Then, in step s 102, eNB according to this two be used for into
Row offset estimation inquires after reference signal, and combines the demodulated reference signal, and the up channel of the user equipment to the eNB is entered
Row offset estimation.
It is highly preferred that in step s 102, eNB inquires after reference signal and the demodulated reference signal according to, and ties
Reference signal and the corresponding weights of demodulated reference signal difference are inquired after described in closing, to the user equipment to the eNB's
Up channel carries out offset estimation.
Specifically, as previously described, because uplink data transmission is frequent, the interval that CFO is calculated is shorter, therefore, adopts
It is more accurate with the CFO obtained by the calculating of Physical Uplink Shared Channel demodulated reference signal.Therefore, when eNB combinations, this inquires after reference
When signal carries out offset estimation with the demodulated reference signal, it is contemplated that this is inquired after corresponding to reference signal and the demodulated reference signal
Weights, such as because Physical Uplink Shared Channel demodulated reference signal is sent, frequent, amount of calculation is smaller, and its weights is inquired after compared with this
The weights of reference signal are bigger.
Preferably, when the context configuring request is consistent with channel estimation configuring request, inquired after using described with reference to letter
Number, channel estimation is carried out to the up channel of the user equipment to eNB.
Specifically, for carrying out inquiring after reference signal and common inquiring after reference signal all by user equipment for offset estimation
Periodically send.Its configuration information is all sent to user equipment by eNB in context configuring request.But this two kinds are inquired after
The purpose of reference signal is different.The former is used to carry out offset estimation, i.e. CFO estimates, and the latter is used for conventional inquire after with reference to letter
Number processing, such as channel estimation.However, being inquired after when this two kinds, reference signal is all configured in the identical time and time-frequency location enters
When row is sent, they can be used for two kinds of purposes.That is, when the context configuring request is consistent with channel estimation configuring request
When, the eNB can utilize what this was used to carrying out offset estimation to inquire after reference signal, to the up letter of the user equipment to the eNB
Road carries out channel estimation.Here, to show difference, will be configured for the context for sending the common configuration information for inquiring after reference signal
Request is referred to as channel estimation configuring request.
Fig. 4 shows that the equipment based on TDD special subframes progress offset estimation that is used for according to a further aspect of the present invention is shown
It is intended to.The eNB includes signal extracting device 501 and frequency deviation estimation device 502.
Signal extracting device 501 in the eNB the TDD special subframes being received from transmitted by user equipment most latter two
In sign bit, extract and inquire after reference signal for carry out offset estimation two.Specifically, in the LTE up processing of physical layer
In, carrier frequency offset (CFO) is physical uplink control channel (PUCCH) and inquires after the important ginseng of reference signal (SRS)
Number.In the prior art, CFO only is calculated when with uplink data transmission, when there is no uplink data transmission, generally
Use initial CFO assignment, rather than CFO estimates.In order to there is an accurate channel estimation to PUCCH and SRS, the present invention is carried
Go out a kind of for carry out offset estimation two to inquire after reference signal by adding in TDD special subframes and estimate CFO's
Method.Because the reference signal of inquiring after for being used to carry out offset estimation is sent periodically, and inquire after the processing of reference signal
And it is uncomplicated, there may be time-domain resource to calculate CFO, therefore, the spy for carrying out offset estimation can be used for periodically with this
Ask reference signal and calculate CFO.In addition, when there is uplink data transmission, can be combined with Physical Uplink Shared Channel demodulation
Reference signal calculates CFO value, i.e. carry out offset estimation.
For example, user equipment inquires after the week of reference signal according to transmission included in the context configuring request received
Phase information, time-domain position information, frequency domain position information etc., being put into most latter two sign bit of TDD special subframes is used for
Carry out offset estimation two inquire after reference signal, and the TDD special subframes are sent to eNB, and the eNB is received from user equipment
The TDD special subframes of transmission, and in most latter two sign bit of the TDD special subframes, extracting this is used to carry out offset estimation
Two inquire after reference signal.
Here, have 10 wireless sub-frames in a radio frames, wherein, there is one or two special in 10 wireless sub-frames
Subframe, the length of the special subframe is consistent with the length of other wireless sub-frames, is a TTI, i.e. 1ms.
Then, the frequency deviation estimation device 502 in the eNB inquires after reference signal according to described two, to the user equipment
Up channel to eNB carries out offset estimation.
Specifically, as shown in Fig. 2 in the prior art, when with uplink data transmission, being shared according to physical uplink
Channel demodulated reference signal estimates CFO value, i.e. carry out offset estimation, usually using the pilot tone of adjacent time-slots in a subframe
Symbol carries out offset estimation.Here, there is 7 sign bits in a time slot, front and rear respectively to have 3 data symbols, middle 1 is pilot tone
Symbol.
The signal that eNB is received is as follows：
Therefore, offset estimation
The frequency deviation region that the algorithm is estimated is [- Δ εmax, Δ εmax], wherein,
That is,Corresponding to ± 1000Hz.
As shown in figure 3, in the present invention, the frequency deviation estimation device 502 in the eNB inquires after reference signal according to this two, right
The user equipment to the eNB up channel carry out offset estimation.The eNB is conjugated phase by this two time domains for inquiring after reference signal
Multiply to carry out offset estimation, as carried out offset estimation using algorithm identical algorithm shown in Fig. 2, but used is this
Reference signal is inquired after in most latter two sign bit of TDD special subframes, rather than ginseng is demodulated using Physical Uplink Shared Channel
Signal is examined to carry out offset estimation.
Here, only needing modification
Certainly, also offset estimation can be carried out using other CFO algorithm for estimating herein, such as by system emulation, for the eNB
A kind of suitable CFO algorithm for estimating is selected, such as selects a kind of CFO of balance that can reach between accuracy and complexity to estimate to calculate
Method.Those skilled in the art will be understood that above-mentioned algorithm is only for example, and other algorithms that are existing or being likely to occur such as are applicable to
The present invention, should also be included within the scope of the present invention, and be incorporated herein by reference herein.
In a preferred embodiment, the eNB also includes send-request unit (not shown) and response reception device (is not shown
Go out)；The user equipment includes request reception device (not shown), response return mechanism (not shown) and sender unit (not
Show).Send-request unit in the eNB sends context configuring request to the user equipment；Asking in the user equipment
Reception device is asked to be received from the context configuring request transmitted by the eNB；Response return mechanism in the user equipment is according to institute
Context configuring request is stated, the context configuration response corresponding with the context configuring request is returned to the eNB；Should
Response reception device in eNB is received from the context configuration response that the user equipment is returned, wherein, the context is matched somebody with somebody
Put response corresponding with the context configuring request；And then, the sender unit in the user equipment is according to the context
Configuring request, in most latter two sign bit of TDD special subframes, sends for carry out offset estimation two to the eNB
Inquire after reference signal；Signal extracting device 501 in the eNB is being received from the TDD special subframes transmitted by user equipment most
In latter two sign bit, extract and inquire after reference signal for carry out offset estimation two；Then, the offset estimation in the eNB
Device 502 inquires after reference signal according to described two, and offset estimation is carried out to the up channel of the user equipment to eNB；Its
In, the context configuring request includes following at least any one：
The cycle information of reference signal is inquired after described in-transmission；
The time-domain position information of reference signal is inquired after described in-transmission；
The frequency domain position information of reference signal is inquired after described in-transmission.
For example, as shown in figure 4, send-request unit in eNB, such as base-band resource controller (Band Resource
Controller, BRC) context configuring request is sent respectively to user equipment, physical layer function entity (Physical
Layer) and ascending resource scheduling device (ULScheduler), to notify three entities to send the spy for carrying out offset estimation
Ask cycle information, time-domain position information, frequency domain position information of reference signal etc.；(e.g., response thereon is returned the user equipment
Device), physical layer function entity and ascending resource scheduling device respond to the base-band resource controller feedback acknowledgment respectively；The eNB
In response reception device, as base-band resource controller receives the confirmation response that three entities are returned respectively；And then, the use
Sender unit in the equipment of family is used for into line frequency according to the context configuring request according to transmission included in the request
The cycle information for inquiring after reference signal, time-domain position information, frequency domain position information for estimating partially etc., in TDD special subframes most
In latter two sign bit, this is added for carrying out two of offset estimation and inquires after reference signal, and the TDD special subframes are sent
Give the eNB.
Here, eNB sends context configuring request, indicate that each user equipment is sent and inquire after reference for offset estimation
The cycle of signal and time-frequency location, its from common to inquire after reference signal context configuring request different.Sending this is used for frequency deviation
The default value cycle for inquiring after reference signal of estimation is, for example, 5ms or 10ms.There are 10 wireless sub-frames in one radio frames, its
In, there are one or two special subframe, the length of the special subframe and the length of other wireless sub-frames in 10 wireless sub-frames
Unanimously, it is a TTI, i.e. 1ms.It should be noted that only considering the special subframe configuration of UpPTS length more than two sign bits herein.
Preferably, the eNB also includes signal receiving device (not shown), and the signal receiving device in the eNB is in uplink
In the shared channel of road, the demodulated reference signal that the user equipment is sent is received from；Then, the frequency deviation estimation device in the eNB
502 inquire after reference signal according to, and with reference to the demodulated reference signal, to the up of the user equipment to the eNB
Channel carries out offset estimation.
Specifically, when can not carry out offset estimation due to no uplink data transmission, sent using periodicity
For carrying out inquiring after reference signal and estimating that CFO is a kind of important supplement to prior art for offset estimation.But due to upper
Uplink data transmission is frequent, and the interval that CFO is calculated is shorter, therefore, using Physical Uplink Shared Channel demodulated reference signal
CFO obtained by calculating is more accurate.Therefore, when there is uplink data transmission, eNB estimates according to this two for carrying out frequency deviation
That counts inquires after reference signal, and combines the demodulated reference signal, and the up channel progress frequency deviation to the user equipment to the eNB is estimated
Meter.For example, signal extracting device 501 in the eNB the TDD special subframes being received from transmitted by user equipment most latter two
In sign bit, extract and inquire after reference signal for carry out offset estimation two；Then, the signal receiving device in the eNB exists
In uplink shared channel, the demodulated reference signal of user equipment transmission is received from；Then, the offset estimation in the eNB
Device 502 combines the demodulated reference signal according to this two reference signals of inquiring after for being used to carry out offset estimation, to the user
Equipment to the up channel of the eNB carries out offset estimation.
It is highly preferred that the frequency deviation estimation device 502 in the eNB is believed according to the reference signal of inquiring after with the demodulation reference
Number, and reference signal and the corresponding weights of demodulated reference signal difference are inquired after with reference to described, to the user equipment to institute
The up channel for stating eNB carries out offset estimation.
Specifically, as previously described, because uplink data transmission is frequent, the interval that CFO is calculated is shorter, therefore, adopts
It is more accurate with the CFO obtained by the calculating of Physical Uplink Shared Channel demodulated reference signal.Therefore, when eNB combinations, this inquires after reference
When signal carries out offset estimation with the demodulated reference signal, it is contemplated that this is inquired after corresponding to reference signal and the demodulated reference signal
Weights, such as because Physical Uplink Shared Channel demodulated reference signal is sent, frequent, amount of calculation is smaller, and its weights is inquired after compared with this
The weights of reference signal are bigger.
Preferably, the channel estimating apparatus that the eNB is also included in channel estimating apparatus (not shown), the eNB is worked as on described
Hereafter configuring request is consistent with channel estimation configuring request, and reference signal is inquired after using described, to the user equipment to eNB's
Up channel carries out channel estimation.
Specifically, for carrying out inquiring after reference signal and common inquiring after reference signal all by user equipment for offset estimation
Periodically send.Its configuration information is all sent to user equipment by eNB in context configuring request.But this two kinds are inquired after
The purpose of reference signal is different.The former is used to carry out offset estimation, i.e. CFO estimates, and the latter is used for conventional inquire after with reference to letter
Number processing, such as channel estimation.However, being inquired after when this two kinds, reference signal is all configured in the identical time and time-frequency location enters
When row is sent, they can be used for two kinds of purposes.That is, when the context configuring request is consistent with channel estimation configuring request
When, the channel estimating apparatus in the eNB can utilize what this was used to carrying out offset estimation to inquire after reference signal, to the user equipment
Up channel to the eNB carries out channel estimation.Here, to show difference, by for sending the common configuration for inquiring after reference signal
The context configuring request of information is referred to as channel estimation configuring request.
It should be noted that the present invention can be carried out in the assembly of software and/or software and hardware, for example, can adopt
Realized with application specific integrated circuit (ASIC), general purpose computer or any other similar hardware device.In one embodiment
In, software program of the invention can realize steps described above or function by computing device.Similarly, it is of the invention
Software program (including related data structure) can be stored in computer readable recording medium storing program for performing, for example, RAM memory,
Magnetically or optically driver or floppy disc and similar devices.In addition, some steps or function of the present invention can employ hardware to realize, example
Such as, as coordinating with processor so as to performing the circuit of each step or function.
In addition, the part of the present invention can be applied to computer program product, such as computer program instructions, when its quilt
When computer is performed, by the operation of the computer, the method according to the invention and/or technical scheme can be called or provided.
And the programmed instruction of the method for the present invention is called, it is possibly stored in fixed or moveable recording medium, and/or pass through
Broadcast or the data flow in other signal bearing medias and be transmitted, and/or be stored according to described program instruction operation
In the working storage of computer equipment.Here, including a device according to one embodiment of present invention, the device includes using
In the memory and processor for execute program instructions of storage computer program instructions, wherein, when the computer program refers to
When order is by the computing device, method and/or skill of the plant running based on foregoing multiple embodiments according to the present invention are triggered
Art scheme.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit is required rather than described above is limited, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as to the claim involved by limitation.This
Outside, it is clear that the word of " comprising " one is not excluded for other units or step, and odd number is not excluded for plural number.That is stated in device claim is multiple
Unit or device can also be realized by a unit or device by software or hardware.The first, the second grade word is used for table
Show title, and be not offered as any specific order.
Claims (13)
1. a kind of method for being used to carry out offset estimation based on TDD special subframes in the enb, wherein, this method includes following step
Suddenly：
A is extracted and estimated for carrying out frequency deviation in most latter two sign bit for the TDD special subframes being received from transmitted by user equipment
Two of meter inquire after reference signal；
B is carried out according to described two time domain conjugate multiplications for inquiring after reference signal to the up channel of the user equipment to eNB
Offset estimation.
2. according to the method described in claim 1, wherein, this method also includes：
- in uplink shared channel, it is received from the demodulated reference signal that the user equipment is sent；
Wherein, the step b includes：
- reference signal is inquired after according to, and with reference to the demodulated reference signal, to the upper of the user equipment to the eNB
Row channel carries out offset estimation.
3. method according to claim 2, wherein, the step b includes：
- reference signal and the demodulated reference signal are inquired after according to, and inquire after reference signal and the demodulation with reference to described
Reference signal distinguishes corresponding weights, and offset estimation is carried out to the up channel of the user equipment to the eNB.
4. according to the method in any one of claims 1 to 3, wherein, this method also includes：
- send context configuring request to the user equipment；
- be received from the context configuration response that the user equipment is returned, wherein, the context configuration response with it is described on
Hereafter configuring request is corresponding；
Wherein, the context configuring request includes following at least any one：
The cycle information of reference signal is inquired after described in-transmission；
The time-domain position information of reference signal is inquired after described in-transmission；
The frequency domain position information of reference signal is inquired after described in-transmission.
5. method according to claim 4, wherein, this method also includes：
- when the context configuring request it is consistent with channel estimation configuring request, inquire after reference signal using described, to it is described use
Family equipment to eNB up channel carries out channel estimation.
6. a kind of method for being used to aid in carrying out offset estimation based on TDD special subframes in a user device, wherein, this method bag
Include following steps：
A is received from the context configuring request transmitted by eNB；
B returns to the context corresponding with the context configuring request according to the context configuring request, to the eNB and matched somebody with somebody
Put response；
C is according to the context configuring request, and in most latter two sign bit of TDD special subframes, being sent to the eNB is used for
Carry out offset estimation two inquire after reference signal, wherein, described two time domain conjugate multiplications for inquiring after reference signal can be to institute
The up channel for stating user equipment to the eNB carries out offset estimation；
Wherein, the context configuring request includes following at least any one：
The cycle information of reference signal is inquired after described in-transmission；
The time-domain position information of reference signal is inquired after described in-transmission；
The frequency domain position information of reference signal is inquired after described in-transmission.
7. a kind of eNB for being used to carry out offset estimation based on TDD special subframes, wherein, the eNB includes：
Signal extracting device, in most latter two sign bit for the TDD special subframes being received from transmitted by user equipment, carrying
Take and inquire after reference signal in carry out offset estimation two；
Frequency deviation estimation device, for according to described two time domain conjugate multiplications for inquiring after reference signal, to the user equipment extremely
ENB up channel carries out offset estimation.
8. eNB according to claim 7, wherein, the eNB also includes：
Signal receiving device, in uplink shared channel, being received from the demodulation reference letter that the user equipment is sent
Number；
Wherein, the frequency deviation estimation device is used for：
- reference signal is inquired after according to, and with reference to the demodulated reference signal, to the upper of the user equipment to the eNB
Row channel carries out offset estimation.
9. eNB according to claim 8, wherein, the frequency deviation estimation device is used for：
- reference signal and the demodulated reference signal are inquired after according to, and inquire after reference signal and the demodulation with reference to described
Reference signal distinguishes corresponding weights, and offset estimation is carried out to the up channel of the user equipment to the eNB.
10. the eNB according to any one of claim 7 to 9, wherein, the eNB also includes：
Send-request unit, for sending context configuring request to the user equipment；
Reception device is responded, for being received from the context configuration response that the user equipment is returned, wherein, the context
Configuration response is corresponding with the context configuring request；
Wherein, the context configuring request includes following at least any one：
The cycle information of reference signal is inquired after described in-transmission；
The time-domain position information of reference signal is inquired after described in-transmission；
The frequency domain position information of reference signal is inquired after described in-transmission.
11. eNB according to claim 10, wherein, the eNB also includes：
Channel estimating apparatus, for when the context configuring request it is consistent with channel estimation configuring request, inquired after using described
Reference signal, channel estimation is carried out to the up channel of the user equipment to eNB.
12. a kind of user equipment for being used to aid in carrying out offset estimation based on TDD special subframes, wherein, the user equipment includes：
Reception device is asked, for the context configuring request being received from transmitted by eNB；
Return mechanism is responded, for according to the context configuring request, being returned and the context configuring request to the eNB
Corresponding context configuration response；
Sender unit, for according to the context configuring request, in most latter two sign bit of TDD special subframes,
Sent to the eNB and inquire after reference signal for carry out offset estimation two, wherein, it is described two inquire after reference signal when
Domain conjugate multiplication can carry out offset estimation to the up channel of the user equipment to the eNB；
Wherein, the context configuring request includes following at least any one：
The cycle information of reference signal is inquired after described in-transmission；
The time-domain position information of reference signal is inquired after described in-transmission；
The frequency domain position information of reference signal is inquired after described in-transmission.
13. a kind of system for being used to carry out offset estimation based on TDD special subframes, including such as any one of claim 7 to 11
Described eNB and user equipment as claimed in claim 12.
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| CN107302392B (en) * | 2016-04-14 | 2020-11-27 | 中兴通讯股份有限公司 | Method and device for combining antenna data under time delay channel |
| CN107612859B (en) * | 2016-07-12 | 2021-11-30 | 中兴通讯股份有限公司 | Transmitting device, data modulation method and device, and signal transmission method and device |
| US10637709B2 (en) | 2017-01-16 | 2020-04-28 | Qualcomm Incorporated | Signaling methods for frequency offset estimation using reference signals |
| CN111224910B (en) * | 2019-12-27 | 2021-08-24 | 京信网络系统股份有限公司 | Frequency offset compensation method, device, equipment and storage medium |
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