CN102724149B - Frequency offset precompensation method, accidental access method, equipment and system - Google Patents
Frequency offset precompensation method, accidental access method, equipment and system Download PDFInfo
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Abstract
The embodiment of the present invention provides frequency offset precompensation method, accidental access method, equipment and system.This frequency offset precompensation method comprises: obtain the center frequency point that cell downlink is specified; The reference frequency of down-conversion is synchronized to described center frequency point, and according to the reference frequency of the down-conversion after synchronous, the laggard line frequency of descending CF signal down-conversion received is estimated partially, obtain downlink frequency offset information; According to described downlink frequency offset information, frequency deviation pre-compensation is carried out to uplink baseband signal.Frequency offset precompensation method provided by the invention, accidental access method, equipment and system are used for realizing carrying out frequency deviation pre-compensation by user equipment side to upward signal.
Description
Technical field
The present invention relates to the information processing technology, particularly relate to a kind of frequency offset precompensation method, accidental access method, equipment and system, belong to communication technical field.
Background technology
In mobile communication system, due to the movement of terminal, can produce Doppler frequency shift between the base station and the terminal, particularly under High-speed Circumstance, this frequency deviation is particularly evident.
According to existing LTE protocol, the translational speed of the terminal that base station (eNB) can be supported is at 350km/h, under some carrier frequency, the highest translational speed can support 500km/h, and under some special screne (as on aircraft), translational speed can reach 800 ~ 1000km/h.Under these scenes, the large frequency deviation produced because of the high-speed mobile of terminal significantly reduces the success rate of multi-upstream access, and has an impact to the capacity of communication system and covering.
But current terminal does not possess the correction capability of frequency deviation, and make under the scene of high-speed motion, terminal is difficult to successfully multi-upstream access.
Summary of the invention
The embodiment of the present invention provides a kind of frequency offset precompensation method, accidental access method, equipment and system, carries out frequency deviation pre-compensation for realizing by terminal to upward signal.
According to the one side of the embodiment of the present invention, a kind of frequency offset precompensation method is provided, comprises:
Obtain the center frequency point that cell downlink is specified;
Downlink frequency offset information is obtained by Frequency Synchronization;
According to described downlink frequency offset information, frequency deviation pre-compensation is carried out to uplink baseband signal.
According to the another aspect of the embodiment of the present invention, a kind of subscriber equipment is provided, comprises:
First processing module, for obtaining the specified center frequency point of cell downlink;
Second processing module, for obtaining downlink frequency offset information by Frequency Synchronization;
3rd processing module, for according to described downlink frequency offset information, carries out frequency deviation pre-compensation to uplink baseband signal.
According to the another aspect of the embodiment of the present invention, a kind of accidental access method is provided, comprises:
The frequency offset precompensation method that subscriber equipment provides according to the embodiment of the present invention carries out frequency deviation pre-compensation to Physical Random Access Channel (PRACH) baseband signal;
Described subscriber equipment carries out up-conversion and up transmission to the PRACH baseband signal after frequency deviation pre-compensation, completes Stochastic accessing to make base station according to the upward signal received.
According to the one side again of the embodiment of the present invention, another kind of subscriber equipment is also provided, comprises:
4th processing module, carries out frequency deviation pre-compensation for the frequency offset precompensation method provided according to the embodiment of the present invention to PRACH baseband signal;
5th processing module, for carrying out up-conversion and up transmission to the PRACH baseband signal after frequency deviation pre-compensation, completes Stochastic accessing to make base station according to the upward signal received.
According to the one side again of the embodiment of the present invention, another kind of accidental access method is provided, comprises:
The upward signal that base station receives user equipment sends, the frequency offset precompensation method that wherein said upward signal provides according to the embodiment of the present invention for described subscriber equipment is carried out frequency deviation pre-compensation to PRACH baseband signal and is carried out the signal of up-conversion acquisition;
Described base station completes Stochastic accessing according to described upward signal.
According to the one side again of the embodiment of the present invention, a kind of base station is also provided, comprises:
6th processing module, for receiving the upward signal that subscriber equipment sends, to be described subscriber equipment according to the frequency offset precompensation method as described in as arbitrary in claim 1-8 carry out frequency deviation pre-compensation to PRACH baseband signal and carry out the signal of up-conversion acquisition wherein said upward signal;
7th processing module, for completing Stochastic accessing according to described upward signal.
According to the one side again of the embodiment of the present invention, a kind of random access system is also provided, comprises the subscriber equipment that the embodiment of the present invention provides, and the base station that the embodiment of the present invention provides.
According to frequency offset precompensation method, accidental access method, equipment and system that the embodiment of the present invention provides, by by UE after carrying out down-going synchronous, obtain the center frequency point that cell downlink is specified, the reference frequency of down-conversion is synchronized to described center frequency point, and according to the reference frequency of the down-conversion after synchronous, the laggard line frequency of descending CF signal down-conversion received is estimated partially, obtain downlink frequency offset information, and according to downlink frequency offset information, frequency deviation pre-compensation is carried out to uplink baseband signal, thus achieve the frequency deviation pre-compensation in UE side.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is typical communication system architecture figure;
Fig. 2 is the schematic flow sheet of the frequency offset precompensation method of the embodiment of the present invention one;
Fig. 3 is the schematic diagram that UE carries out frequency deviation estimation in downlink reception process;
Fig. 4 is the first schematic diagram that UE carries out frequency deviation pre-compensation in up emission process;
Fig. 5 is PLL operation principle schematic diagram;
Fig. 6 is the second schematic diagram that UE carries out frequency deviation pre-compensation in up emission process;
Fig. 7 is the structural representation of the subscriber equipment of the embodiment of the present invention four;
Fig. 8 is the schematic flow sheet of the accidental access method of the embodiment of the present invention five;
Fig. 9 is that UE adopts TA precompensation mode to send the schematic diagram of access lead sequence;
Figure 10 is the structural representation of the subscriber equipment of the embodiment of the present invention six;
Figure 11 is the schematic flow sheet of the accidental access method of the embodiment of the present invention seven;
Figure 12 is that eNodeB divides secondary to intercept the schematic diagram of sampling window;
Figure 13 is the structural representation of the base station of the embodiment of the present invention eight.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
Fig. 1 is typical communication system architecture figure.As shown in Figure 1, this communication system comprises base station (eNodeB) and subscriber equipment (UE).The frequency offset precompensation method of the embodiment of the present invention one is performed by UE.
Frequency offset precompensation method of the present invention comprises the following steps: obtain the center frequency point that cell downlink is specified; Downlink frequency offset information is obtained by Frequency Synchronization; According to described downlink frequency offset information, compensate of frequency deviation is carried out to uplink baseband signal.The subscriber equipment of execution frequency deviation pre-compensation of the present invention, comprises the first processing module, for obtaining the specified center frequency point of cell downlink; Second processing module, for obtaining downlink frequency offset information by Frequency Synchronization; 3rd processing module, for according to described downlink frequency offset information, carries out frequency deviation pre-compensation to uplink baseband signal.Following examples will illustrate the inventive method, and its aim does not leave above-mentioned core concept.
Fig. 2 is the schematic flow sheet of the frequency offset precompensation method of the embodiment of the present invention one.As shown in Figure 2, this frequency offset precompensation method comprises the following steps:
Step S201, obtains the center frequency point that cell downlink is specified;
Step S202, is synchronized to described center frequency point by the reference frequency of down-conversion, and partially estimates the laggard line frequency of descending CF signal down-conversion received according to the reference frequency of the down-conversion after synchronous, obtains downlink frequency offset information;
Step S203, according to described downlink frequency offset information, carries out frequency deviation pre-compensation to uplink baseband signal.
Particularly, after UE start, first by synchronizing channel (Synchronization Channel, SCH) down-going synchronous is carried out, find reception starting point and the cell ID (Cell ID) of radio frames, subframe, then detect broadcast channel (Broadcast Channel, BCH), and receive the descending CF signal that eNodeB issues.Therefore, by obtaining the specified center frequency point of cell downlink, the reference frequency of down-conversion is synchronized to described center frequency point, and according to the reference frequency of the down-conversion after synchronous, the laggard line frequency of descending CF signal down-conversion received is estimated, partially to obtain downlink frequency offset information.Wherein, such as adopt any frequency excursion algorithm of prior art to carry out frequency deviation estimation to the baseband signal obtained after down-conversion, be not construed as limiting herein.
UE because downlink center frequency is identical with up center frequency point or there is droop, therefore according to downlink frequency offset information determination uplink frequency offset information, thus can carry out frequency deviation pre-compensation to uplink baseband signal after obtaining downlink frequency offset information.
According to the frequency offset precompensation method of the present embodiment, by by UE after carrying out down-going synchronous, obtain the center frequency point that cell downlink is specified, the reference frequency of down-conversion is synchronized to described center frequency point, and according to the reference frequency of the down-conversion after synchronous, the laggard line frequency of descending CF signal down-conversion received is estimated partially, obtain downlink frequency offset information, and according to downlink frequency offset information, frequency deviation pre-compensation is carried out to uplink baseband signal, thus achieve the frequency deviation pre-compensation in UE side.
Embodiment two
On the basis of embodiment one, the specified center frequency point of described acquisition cell downlink specifically comprises: resolve from cell broadcast messages and obtain the specified center frequency point of described cell downlink; Or the center frequency point that the cell downlink that acquisition presets is specified.
Wherein, from cell broadcast messages, resolve the center frequency point obtaining described cell downlink specified specifically comprise: determine according to formula fc=f (F_index)+fi*F_step the center frequency point that described cell downlink is specified, wherein, fc is the specified center frequency point of described cell downlink, F_index is frequency range numbering indicated in cell broadcast messages, and f (F_index) is the initial physics frequency of the frequency range that indicated by F_index, frequency range numbering is corresponding; Fi is the frequency sub-band numbering in the frequency range of frequency range numbering correspondence indicated by F_index, and F_step is the interval of the frequency sub-band in the frequency range of frequency range numbering correspondence indicated by F_index.
After obtaining the specified center frequency point of cell downlink, the reference frequency of the down-conversion that order exports is synchronized to center frequency point.If concrete UE adopts local High Precision Crystal Oscillator (such as adopting the crystal oscillator of error range+-0.01ppm) to provide high precisely reference frequency source, namely therein reference frequency is very accurate, the reference frequency of the down-conversion of output then directly can be made to be synchronized to center frequency point, if UE therein reference frequency precision cannot ensure, then can utilize outside reference frequency source as a reference, the reference frequency of such as this outside is by global positioning system (Global Positioning System, GPS) calibrate, the reference frequency of the down-conversion that order exports is synchronized to center frequency point.
Then down-conversion is carried out to obtain baseband signal to the descending CF signal received, and according to the reference frequency of the down-conversion after synchronous, frequency deviation estimation is carried out to obtained baseband signal, obtain downlink frequency offset information.Preferentially, UE according to the reference frequency of the down-conversion after synchronous to different reception to the laggard line frequency of descending CF signal down-conversion partially estimate, obtain and upgrade downlink frequency offset information.
The specified center frequency point relevant information of cell downlink is such as carried in the following ways in broadcast:
1) numerical value of " freqBandIndicator " field and " ul-CarrierFreq " field is extracted respectively from " SystemInformationBlockType1 " territory of broadcast channel and " SystemInformationBlockType2 " territory, and search center frequency point corresponding in 3GPP agreement according to extracted numerical value, specifically in tdd mode, the specified center frequency point of cell downlink is frequency corresponding to " ul-CarrierFreq " field, in the fdd mode, need the table 5.7.4-1 searching LTE 36101 agreement according to " freqBandIndicator " field, namely " TX-RXcarrier centre frequency separation " is shown, " ul-CarrierFreq " field calculates downlink center frequency.
2) first obtain frequency at which frequency band (band) according to " freqBandIndicator " field in " SystemInformationBlockType1 " territory, then utilize 10bits information reserved in MasterInformationBlock information to determine descending frequency.We know that the bandwidth of each band specified in existing protocol is within 200MHz, if represent 200MHz scope with the 10bits in MasterInformationBlock information, step-length elects 200KHz as can cover this scope.
More specifically, Fig. 3 is the schematic diagram that UE carries out frequency deviation estimation in downlink reception process.As shown in Figure 3, UE is by detecting downlink broadcast, and obtain the center frequency point that cell downlink is specified, the center frequency point specified according to cell downlink selects an accurate reference frequency f
out, this reference frequency f
outbe such as UE therein reference frequency or the clock generating by GPS.Preset a phase-locked loop (Phase Locked Loop, PLL) in UE, utilize PLL to reference frequency f
outlock, to obtain the center for standard frequency of the downstream signal that eNodeB launches, the center frequency point f that namely cell downlink is specified
c.The practical center frequency that UE obtains downstream signal is f
dLif the Doppler frequency shift of setting channel is f
dOP, then f
dL=f
c+ f
dOP.UE is according to center frequency point f
cdown-converted is carried out to the downstream signal obtained, obtains baseband signal, utilize baseband signal to carry out frequency deviation estimation, then can obtain downlink frequency offset △ f=f
c-f
dL, there is △ f=f in theory
dOP.
UE is in up process of transmitting, and supposing the system work is (namely up-downgoing emission standard center frequency point is identical) in tdd mode, and the downlink frequency offset △ f for above-mentioned acquisition carries out compensate of frequency deviation to the signal of up transmission.Fig. 4 is the first schematic diagram that UE carries out frequency deviation pre-compensation in up emission process.As shown in Figure 4, UE utilizes downlink frequency offset △ f to carry out frequency deviation pre-compensation to acquiescence baseband signal, and to the baseband signal after frequency deviation pre-compensation and center frequency point f
ccarry out up-conversion, the reference frequency obtaining up-conversion is f
uL=f
cthe up transmission signal of+△ f, this up transmission signal is such as access lead sequence or other upward signals arbitrarily.
If in the fdd mode (i.e. up-downgoing emission standard center frequency point different), then up precompensation frequency deviation value Δ f_UL should be Δ f × K to system works, the center frequency point that the reference frequency/cell downlink of wherein COEFFICIENT K=uplink baseband signal up-conversion is specified.In order to simplify discussion, illustrate for tdd mode below.
The operation principle of PLL is described as follows.Fig. 5 is PLL operation principle schematic diagram.As shown in Figure 5, PLL is by reference frequency f
outas with reference to clock, utilize phase discriminator, low pass filter (LPF) and voltage controlled oscillator (VCO) to reference frequency f
outprocess, obtain the reference frequency f of down-conversion
rF, and utilize frequency divider to f
rFcarry out scaling down processing, and feed back to phase discriminator.Setting f
out=f
c/ N, wherein N is the multiple of frequency divider, then the reference frequency frequency of the last down-conversion produced is f
rF=f
c.
Embodiment three
On the basis of above-described embodiment, according to described downlink frequency offset information, frequency deviation pre-compensation is carried out to uplink baseband signal and specifically comprises:
According to described downlink frequency offset information, obtain the precompensation frequency deviation value of uplink baseband signal, and according to described precompensation frequency deviation value, frequency deviation pre-compensation is carried out to described uplink baseband signal;
The center frequency point specified according to described cell downlink, arranges the reference frequency of the uplink baseband signal up-conversion after frequency deviation pre-compensation, and according to the reference frequency of described up-conversion, the uplink baseband signal after described frequency deviation pre-compensation is carried out to up-conversion and sends.
Wherein, according to described downlink frequency offset information, the precompensation frequency deviation value obtaining uplink baseband signal specifically comprises:
If community is TDD system, then determine that described precompensation frequency deviation value is downlink frequency offset information;
If community is FDD system, then determine that described precompensation frequency deviation value is Δ f × K, wherein Δ f is described downlink frequency offset information, and K is the business of the specified center frequency point of the reference frequency of uplink baseband signal up-conversion and described cell downlink;
Correspondingly, describedly according to described precompensation frequency deviation value, frequency deviation pre-compensation is carried out to described uplink baseband signal and specifically comprises:
According to described precompensation frequency deviation value, single frequency deviation pre-compensation is carried out to described uplink baseband signal; Or
Described precompensation frequency deviation value is divided into the frequency deviation of uplink baseband channel distortion experienced integral multiple and the frequency deviation of little several times, and respectively according to the frequency deviation of described integral multiple and the frequency deviation of described little several times, frequency deviation pre-compensation is carried out to described uplink baseband signal.
Further, the described center frequency point specified according to described cell downlink, the reference frequency arranging the uplink baseband signal up-conversion after frequency deviation pre-compensation specifically comprises:
If community, place is TDD system, then the reference frequency of described up-conversion is set to the specified center frequency point of described cell downlink;
If community is FDD system, then to table look-up acquisition deviant according to " freqBandIndicator " field value in cell broadcast messages " SystemInformationBlockType1 " territory, and the reference frequency of described up-conversion is set to the difference of the specified center frequency point of described cell downlink and described deviant.
Fig. 6 is the second schematic diagram that UE carries out frequency deviation pre-compensation in up emission process.As shown in Figure 6, such as, the precompensation frequency deviation value Δ f obtained
_ UL=(k+ θ
f) f
carrier, wherein, k is integer, θ
ffor decimal, f
carrierfor subcarrier spacing.Then when utilizing frequency deviation △ f to carry out compensate of frequency deviation to transmission signal, integer frequency offset adopts the mode of subcarrier frequency displacement, and fractional part of frequency offset processes when baseband signal sends.As shown in Figure 6, before inverse discrete Fourier transform (IFFT), integer frequency offset compensation is carried out for transmission signal, an i.e. subcarrier translation k unit, before adding CP after the ifft, fractional part of frequency offset compensation is carried out for transmission signal, namely before to the up transmission of baseband signal, be multiplied by a phase pushing figure
wherein a
kfor a kth subcarrier in frequency domain, f
kfor the frequency that a kth subcarrier in frequency domain is corresponding, n is the n-th subcarrier index, and N is counting of IFFT.
Error range for compensate of frequency deviation makes analysis for TDD system.Table 1 is the analysis of TDD system frequency error, wherein:
Df in Table 1
bSfor the frequency error of eNodeB side, df
uEfor the frequency error of UE side, reference data is surveyed according to LTE, these 2 numerical value are respectively ± 0.05ppm and ± 0.1ppm within, if center frequency point is 2GHz, the frequency offset error scope that then upward signal that receives of base station side is total is: [-600Hz, 600Hz], and be spaced apart 1.25KHz in existing LTE system sub-carriers, frequency offset error is less than 1/2 subcarrier spacing.
Table 1
| The center frequency point that cell downlink is specified | f c+df BS |
| Channel produces Doppler shift | f DOP |
| UE receives the center frequency point of descending CF signal | f c+df BS+f DOP |
| The reference frequency of down-conversion | f c+df UE |
| The downlink frequency offset that UE estimates | Δf＝df UE-df BS-f DOP |
| Precompensation frequency deviation value | Δf |
| The reference frequency of up-conversion | f c+df UE+Δf |
| Base station receives the center frequency point of upward signal | f c+df UE+Δf+f DOP |
| The frequency deviation of base station baseband signal | df UE+Δf+f DOP-df BS=2df UE-2df BS |
Embodiment four
Fig. 7 is the structural representation of the subscriber equipment of the embodiment of the present invention four.As shown in Figure 7, subscriber equipment comprises:
First processing module 71, for obtaining the specified center frequency point of cell downlink;
Second processing module 72, for the reference frequency of down-conversion is synchronized to described center frequency point, and partially estimates the laggard line frequency of descending CF signal down-conversion received according to the reference frequency of the down-conversion after synchronous, obtains downlink frequency offset information;
3rd processing module 73, for according to described downlink frequency offset information, carries out frequency deviation pre-compensation to uplink baseband signal.
The subscriber equipment of the present embodiment is for performing the frequency offset precompensation method of above-described embodiment, and its idiographic flow is identical with previous embodiment, repeats no more herein.
According to the subscriber equipment of the present embodiment, after carrying out down-going synchronous, obtain the center frequency point that cell downlink is specified, the reference frequency of down-conversion is synchronized to described center frequency point, and according to the reference frequency of the down-conversion after synchronous, the laggard line frequency of descending CF signal down-conversion received is estimated partially, obtain downlink frequency offset information, and according to downlink frequency offset information, frequency deviation pre-compensation is carried out to uplink baseband signal, thus achieve the frequency deviation pre-compensation in UE side.
Further, described first processing module also obtains the specified center frequency point of described cell downlink for resolving from cell broadcast messages, or obtains the specified center frequency point of the cell downlink that presets.
Further, described first processing module is also for determining according to formula fc=f (F_index)+fi*F_step the center frequency point that described cell downlink is specified, wherein, fc is the specified center frequency point of described cell downlink, F_index is the initial physics frequency of frequency range numbering indicated in cell broadcast messages, f (F_index) frequency range that frequency range numbering is corresponding indicated by F_index; Frequency sub-band numbering in the fi frequency range that frequency range numbering is corresponding indicated by F_index, the interval of the frequency sub-band in the F_step frequency range that frequency range numbering is corresponding indicated by F_index.
Further, the reference frequency of described down-conversion also for utilizing external crystal-controlled oscillation or local crystal oscillator to provide reference frequency source, and according to described reference frequency source, is synchronized to described center frequency point by phase-locked loop by described second processing module.
Further, described second processing module also for according to the reference frequency of the down-conversion after synchronous to different reception to the laggard line frequency of descending CF signal down-conversion partially estimate, obtain and upgrade described downlink frequency offset information.
Further, described 3rd processing module also for according to described downlink frequency offset information, obtains the precompensation frequency deviation value of uplink baseband signal, and carries out frequency deviation pre-compensation according to described precompensation frequency deviation value to described uplink baseband signal; The center frequency point specified according to described cell downlink, arranges the reference frequency of the uplink baseband signal up-conversion after frequency deviation pre-compensation, and according to the reference frequency of described up-conversion, the uplink baseband signal after described frequency deviation pre-compensation is carried out to up-conversion and sends.
Further, if described 3rd processing module is also TDD system for community, place, then the reference frequency of described up-conversion is set to the specified center frequency point of described cell downlink; If community is FDD system, then to table look-up acquisition deviant according to " freqBandIndicator " field value in cell broadcast messages " SystemInformationBlockType1 " territory, and the reference frequency of described up-conversion is set to the difference of the specified center frequency point of described cell downlink and described deviant.
Further, if described 3rd processing module is also TDD system for community, then determine that described precompensation frequency deviation value is downlink frequency offset information; If community is FDD system, then determine that described precompensation frequency deviation value is Δ f × K, wherein Δ f is described downlink frequency offset information, and K is the business of the specified center frequency point of the reference frequency of uplink baseband signal up-conversion and described cell downlink; According to described precompensation frequency deviation value, single frequency deviation pre-compensation is carried out to described uplink baseband signal; Or described precompensation frequency deviation value is divided into the frequency deviation of uplink baseband channel distortion experienced integral multiple and the frequency deviation of little several times, and respectively according to the frequency deviation of described integral multiple and the frequency deviation of described little several times, frequency deviation pre-compensation is carried out to described uplink baseband signal.
Embodiment five
The accidental access method of the embodiment of the present invention five is performed by UE.
Fig. 8 is the schematic flow sheet of the accidental access method of the embodiment of the present invention five.As shown in Figure 8, this accidental access method comprises the following steps:
Step S801, UE carry out frequency deviation pre-compensation according to frequency offset precompensation method to PRACH baseband signal; Wherein, this frequency offset precompensation method is such as the frequency offset precompensation method of above-mentioned any embodiment;
Step S802, UE carry out up-conversion and up transmission to the PRACH baseband signal after frequency deviation pre-compensation, complete Stochastic accessing to make base station according to the upward signal received.
In actual applications, first UE chooses an access lead sequence from preset access lead resource, and generates the PRACH baseband signal S of acquiescence according to this access lead sequence
(t)(namely not considering the PRACH baseband signal of frequency deviation), and at the PRACH baseband signal S of this acquiescence
(t)on basis, carrying out frequency deviation pre-compensation according to calculating precompensation frequency deviation value Δ f_UL, obtaining the PRACH baseband signal S of up transmission
(t)'.Wherein S
(t)'=S
(t)× e
j2 π Δ f_ULt.Wherein, UE can take the method generating PRACH baseband signal arbitrarily, obtains the PRACH baseband signal S of acquiescence
(t).
According to the accidental access method of above-described embodiment, frequency deviation pre-compensation is completed in UE side, therefore eNodeB is when the access lead sequence through frequency deviation pre-compensation sent according to UE carries out Stochastic accessing, without the need to considering the frequency deviation time delay ambiguity brought because of the frequency deviation of the factors such as UE moves generation, avoid significantly transformation eNodeB carried out by eNodeB execution compensate of frequency deviation.
Further, in the accidental access method of above-described embodiment, described UE up transmission access lead sequence (namely the PRACH baseband signal after frequency deviation pre-compensation being carried out to the upward signal of up-conversion acquisition) specifically comprises:
UE sends described access lead sequence according to the first Timing Advance of upstream synchronous timing and down-going synchronous timing;
If preset in waiting time first the accidental access response (RAR) not receiving described eNodeB and return, then described UE sends described access lead sequence according to the second Timing Advance of upstream synchronous timing and down-going synchronous timing.
Further, described first Timing Advance is 0, and described second Timing Advance is 667 microseconds.
Fig. 9 is that UE adopts Timing Advance (Timing Advance, TA) precompensation mode sends the schematic diagram of access lead sequence, (a) wherein in Fig. 9 is for UE is when TA=0, send the schematic diagram of access lead sequence nucleotide sequence, (b) in Fig. 9 is for UE is when TA=offset, send the schematic diagram of access lead sequence, wherein offset is such as 667 microseconds.This access lead sequence is PRACH sequence, and as shown in (a) He (b) in Fig. 9, PRACH sequence comprises Cyclic Prefix (Cycle Prefix, CP) and Sequence (Sequence, SEQ), and wherein CP is that the latter half getting SEQ obtains.
As shown in (a) in Fig. 9, when UE sends PRACH sequence for the first time according to TA=0, if the distance of UE distance community is that 0-100km, eNodeB successfully can detect the PRACH sequence that UE sends, and return corresponding RAR to UE; If the distance of UE distance community is that 100-200km, eNodeB successfully can not detect the PRACH sequence that UE sends, corresponding RAR can not be returned to UE.Therefore, when UE first to preset in waiting time after sending PRACH sequence for the first time according to TA=0, do not receive the RAR that eNodeB returns, then again send PRACH sequence according to TA=offset.Wherein, the first default waiting time can set according to 3GPP agreement.
As shown in (b) in Fig. 9, when UE sends PRACH sequence according to TA=offset, if the distance of UE distance community is that 0-100km, eNodeB successfully can not detect the PRACH sequence that UE sends; If the distance of UE distance community is 100-200km, then eNodeB successfully can detect the PRACH sequence that UE sends, and returns corresponding RAR to UE.Visible, when the distance of UE distance community is 100-200km, by adopting the mode of TA precompensation to send PRACH sequence, successfully can obtains RAR, thus completing Stochastic accessing.
When UE adopts the mode of TA precompensation to send access lead sequence, under the scene of UE high-speed mobile, not only overcome frequency deviation time delay ambiguity, also overcome size time delay ambiguity, further increase the Stochastic accessing success rate under UE high-speed mobile scene.Further, realize TA precompensation by UE, do not need to increase TA width, only need in UE preset TA=offset, and make the chip timing logic support of UE be greater than the timing advance of 1334 microseconds.
Further, in the accidental access method of above-described embodiment, described UE, to after described eNodeB sends described access lead sequence, also comprises:
If preset in waiting time second the accidental access response not receiving described eNodeB and return, then improve transmitting power, and again send described access lead sequence to described eNodeB.
Wherein, the second concrete numerical value presetting the transmitting power of waiting time and raising all can set according to 3GPP agreement.Again send access lead sequence to eNodeB such as to comprise again by TA=0 and by TA=offset transmission access lead sequence.
Embodiment six
Figure 10 is the structural representation of the subscriber equipment of the embodiment of the present invention six.As shown in Figure 10, this subscriber equipment comprises:
4th processing module 101, for carrying out frequency deviation pre-compensation according to frequency offset precompensation method arbitrary in embodiment one to three to PRACH baseband signal;
5th processing module 102, for carrying out up-conversion and up transmission to the PRACH baseband signal after frequency deviation pre-compensation, completes Stochastic accessing to make base station according to the upward signal received.
The subscriber equipment of the present embodiment is for performing the accidental access method of above-described embodiment five, and its idiographic flow is identical with embodiment five, so place repeats no more.
According to the subscriber equipment of the present embodiment, complete frequency deviation pre-compensation, therefore eNodeB is when the access lead sequence through frequency deviation pre-compensation sent according to UE carries out Stochastic accessing, without the need to considering the frequency deviation time delay ambiguity brought because of the frequency deviation of the factors such as UE moves generation, avoid significantly transformation eNodeB carried out by eNodeB execution compensate of frequency deviation.
Embodiment seven
The accidental access method of the embodiment of the present invention seven is performed by eNodeB.
Figure 11 is the schematic flow sheet of the accidental access method of the embodiment of the present invention seven.As shown in figure 11, this accidental access method comprises the following steps:
Step S1101, upward signal after the frequency deviation pre-compensation that base station receives user equipment sends, wherein said upward signal carries out frequency deviation pre-compensation according to the frequency offset precompensation method as described in embodiment one to triple-cropping one to PRACH baseband signal for described subscriber equipment and carries out the signal of up-conversion acquisition;
Step S1102, described base station completes Stochastic accessing according to described upward signal.
Particularly, eNodeB intercepts the PRACH sequence that UE sends by utilizing preset sampling window, the access lead carried with the SEQ part obtaining PRACH sequence.ENodeB, by being undertaken relevant by access lead resource available to this access lead and this locality, has obtained the relevant parameter needed for Stochastic accessing, thus has completed Stochastic accessing.
According to the accidental access method of above-described embodiment, owing to completing frequency deviation pre-compensation in UE side, therefore eNodeB is when the access lead sequence through frequency deviation pre-compensation sent according to UE carries out Stochastic accessing, without the need to considering the frequency deviation time delay ambiguity brought because of the frequency deviation of the factors such as UE moves generation, the reliable Stochastic accessing under UE high-speed mobile scene can be realized.
Further, base station receives user equipment send frequency deviation pre-compensation after upward signal specifically comprise:
From described access lead sequence, obtain the first sample sequence according to the first sampling window, from PRACH sequence, obtain the second sample sequence according to the second sampling window;
Correspondingly, complete Stochastic accessing according to PRACH sequence specifically to comprise:
Stochastic accessing is completed according to described first sample sequence and described second sample sequence.
Figure 12 is that eNodeB divides secondary to intercept the schematic diagram of sampling window.As shown in figure 12, the first sampling window and the second sampling window is such as preset in eNodeB, the time interval wherein between the second sampling window and the first sampling window is such as 667us(corresponds to the distance of 100km), and Cyclic Prefix duration T in PRACH sequence
cP=685us, Sequence duration T
sEQ=800us.For the UE being positioned at center of housing estate place, the first sampling window can be truncated to whole SEQ parts of PRACH sequence, successfully obtains the access lead carried in PRACH sequence, thus completes Stochastic accessing.Because CP is that the latter half getting SEQ obtains, as long as so meet the time delay that the distance because of UE and center of housing estate causes to be less than or equal to T
cPcondition, eNodeB still can utilize the first sampling window to obtain the access lead carried in PRACH sequence, such as the UE within distance center of housing estate place 100km, the time delay caused when the distance due to UE and center of housing estate is 100km is 667us, meets 667us and is less than T
cP, the first sampling window now can be utilized to obtain the access lead carried in PRACH sequence.
The time delay caused when the distance because of UE and center of housing estate is greater than T
cPtime, the complete access lead carried cannot be obtained in PRACH sequence when eNodeB utilizes the first sampling window to sample, will cause carrying out Stochastic accessing, now, then need eNodeB to utilize the second sampling window to sample.As shown in Figure 6, for the UE of distance center of housing estate place 200km, the first sample sequence utilizing the first sampling window to intercept does not comprise complete access lead, and the second sample sequence utilizing the second sampling window to intercept comprises complete access lead.After eNodeB obtains the first sample sequence and the second sample sequence, by being undertaken relevant by the first sample sequence and the second sample sequence access lead resource available to this locality respectively, obtain the first power delay spectrum and the second power delay spectrum.The peak value of such as the first power delay spectrum is the first peak value, the peak value of the second power delay spectrum is the second peak value, first peak value can represent the highest degree of correlation of the available access lead resource of the first sample sequence and this locality, and the second peak value can represent the highest degree of correlation of the available access lead resource of the second sample sequence and this locality.When sample sequence comprises complete access lead, the access lead mated completely can be found from the available access lead resource in this locality, the numerical value of now corresponding PDP spectrum is peak, therefore by comparing the size of the first peak value and the second peak value, then can determine which sequence in the first sample sequence and the second sample sequence includes complete access lead, thus determine distance and winding time delay (the Round Trip Delay of UE and center of housing estate, and complete the Stochastic accessing of UE RTD).
Therefore, when eNodeB is to slide the mode of window, when intercepting sampling window at twice, if arrange the first sampling window and the second sampling window according to above-mentioned parameter, the successful Stochastic accessing of the UE within the center of housing estate 200km that can realize adjusting the distance.
Based on above-mentioned explanation, those skilled in the art can be known, by regulating the time delay between the first sampling window and the second sampling window, and/or set up multiple sampling window, the successful Stochastic accessing of the UE beyond the center of housing estate 200km that can adjust the distance.
With reference to the error analysis in table 1, if center frequency point is 2GHz, then the frequency offset error scope that the upward signal that receives of base station side is total is: [-600Hz, 600Hz], and being spaced apart 1.25KHz in existing LTE system sub-carriers, frequency offset error is less than 1/2 subcarrier spacing.Therefore eNodeB is carrying out during the relevant PDP obtained composes according to the access lead sequence that receives and its own sequence, the peak value at RTD place is greater than at the mirror image peak value of an inclined position of frequency multiplication, therefore, by choose PDP spectrum in peak-peak as RTD value and the above-mentioned frequency offset error of maskable.
Embodiment eight
Figure 13 is the structural representation of the base station of the embodiment of the present invention eight.As shown in figure 13, this base station comprises:
6th processing module 131, for receiving the upward signal that subscriber equipment sends, wherein said upward signal is described subscriber equipment according to carrying out frequency deviation pre-compensation as the frequency offset precompensation method as described in arbitrary in embodiment one to three to PRACH baseband signal and carrying out the signal of up-conversion acquisition;
7th processing module 132, for completing Stochastic accessing according to described upward signal.
The base station of the present embodiment is for performing the accidental access method of above-described embodiment seven, and its idiographic flow is identical with embodiment seven, so place repeats no more.
According to the base station of the present embodiment, owing to completing frequency deviation pre-compensation in UE side, therefore eNodeB is when the access lead sequence through frequency deviation pre-compensation sent according to UE carries out Stochastic accessing, without the need to considering the frequency deviation time delay ambiguity brought because of the frequency deviation of the factors such as UE moves generation, the reliable Stochastic accessing under UE high-speed mobile scene can be realized.
Further, described sample sequence also for obtaining sample sequence according to the sampling window preset from described upward signal, carries out relevant to local sequence by the 7th processing module, obtains power delay spectrum; Using the peak-peak in described power delay spectrum as winding time delay, and complete Stochastic accessing according to described winding time delay.Embodiment nine
The embodiment of the present invention nine provides a kind of random access system, and this random access system comprises the UE of above-described embodiment six, and the base station of above-described embodiment eight.
According to the random access system of the present embodiment, owing to completing frequency deviation pre-compensation in UE side, therefore eNodeB is when the access lead sequence through frequency deviation pre-compensation sent according to UE carries out Stochastic accessing, without the need to considering the frequency deviation time delay ambiguity brought because of the frequency deviation of the factors such as UE moves generation, the reliable Stochastic accessing under UE high-speed mobile scene can be realized.
One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that program command is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (21)
1. an accidental access method, is characterized in that, comprising:
Subscriber equipment carries out frequency deviation pre-compensation to Physical Random Access Channel PRACH baseband signal;
Described subscriber equipment carries out up-conversion and up transmission to the PRACH baseband signal after frequency deviation pre-compensation, from described upward signal, multiple sample sequence is obtained according to the multiple sampling windows preset respectively to make base station, described multiple sample sequence is carried out relevant to local sequence respectively, obtain multiple power delay spectrum, and using the peak-peak in described multiple power delay spectrum as winding time delay, complete Stochastic accessing according to described winding time delay;
Wherein, described subscriber equipment carries out frequency deviation pre-compensation to Physical Random Access Channel PRACH baseband signal, comprising:
Described subscriber equipment obtains the specified center frequency point of cell downlink;
Described subscriber equipment obtains downlink frequency offset information by Frequency Synchronization;
Described subscriber equipment, according to described downlink frequency offset information, carries out compensate of frequency deviation to uplink baseband signal.
2. accidental access method according to claim 1, is characterized in that, described subscriber equipment obtains downlink frequency offset information by Frequency Synchronization, comprising:
The reference frequency of down-conversion is synchronized to described center frequency point by described subscriber equipment, and partially estimates the laggard line frequency of descending CF signal down-conversion received according to the reference frequency of the down-conversion after synchronous, obtains described downlink frequency offset information.
3. accidental access method according to claim 2, is characterized in that, the center frequency point that described subscriber equipment obtains cell downlink specified specifically comprises:
Described subscriber equipment is resolved and is obtained the specified center frequency point of described cell downlink from cell broadcast messages; Or
Described subscriber equipment obtains the specified center frequency point of the cell downlink that presets.
4. accidental access method according to claim 3, it is characterized in that, described subscriber equipment is resolved the center frequency point obtaining described cell downlink specified and is specifically comprised from cell broadcast messages: described subscriber equipment determines according to formula fc=f (F_index)+fi*F_step the center frequency point that described cell downlink is specified, wherein, fc is the specified center frequency point of described cell downlink, F_index is frequency range numbering indicated in cell broadcast messages, and f (F_index) is the initial physics frequency of the frequency range that indicated by F_index, frequency range numbering is corresponding; Fi is the frequency sub-band numbering in the frequency range of frequency range numbering correspondence indicated by F_index, and F_step is the interval of the frequency sub-band in the frequency range of frequency range numbering correspondence indicated by F_index.
5. accidental access method according to claim 2, is characterized in that, the reference frequency of down-conversion is synchronized to described center frequency point and specifically comprises by described subscriber equipment:
Described subscriber equipment utilizes external crystal-controlled oscillation or local crystal oscillator to provide reference frequency source, and according to described reference frequency source, by phase-locked loop, the reference frequency of described down-conversion is synchronized to described center frequency point.
6. accidental access method according to claim 2, it is characterized in that, described subscriber equipment is estimated the laggard line frequency of descending CF signal down-conversion received partially according to the reference frequency of the down-conversion after synchronous, obtain described downlink frequency offset information specifically to comprise: described subscriber equipment according to the reference frequency of the down-conversion after synchronous to different reception to the laggard line frequency of descending CF signal down-conversion partially estimate, obtain and upgrade described downlink frequency offset information.
7. accidental access method according to claim 1, is characterized in that, described subscriber equipment, according to described downlink frequency offset information, carries out compensate of frequency deviation to uplink baseband signal and specifically comprises:
Described subscriber equipment, according to described downlink frequency offset information, obtains the precompensation frequency deviation value of uplink baseband signal, and carries out frequency deviation pre-compensation according to described precompensation frequency deviation value to described uplink baseband signal;
The center frequency point that described subscriber equipment is specified according to described cell downlink, the reference frequency of the uplink baseband signal up-conversion after frequency deviation pre-compensation is set, and according to the reference frequency of described up-conversion, the uplink baseband signal after described frequency deviation pre-compensation is carried out up-conversion and sent.
8. accidental access method according to claim 7, is characterized in that, the center frequency point that described subscriber equipment is specified according to described cell downlink, and the reference frequency arranging the uplink baseband signal up-conversion after frequency deviation pre-compensation specifically comprises:
If community, place is TDD system, then the reference frequency of described up-conversion is set to the specified center frequency point of described cell downlink by described subscriber equipment;
If community is FDD system, then described subscriber equipment to be tabled look-up acquisition deviant according to " freqBandIndicator " field value in cell broadcast messages " SystemInformationBlockType1 " territory, and the reference frequency of described up-conversion is set to the difference of the specified center frequency point of described cell downlink and described deviant.
9. accidental access method according to claim 7, is characterized in that, described subscriber equipment is according to described downlink frequency offset information, and the precompensation frequency deviation value obtaining uplink baseband signal specifically comprises:
If community is TDD system, then described subscriber equipment determines that described precompensation frequency deviation value is downlink frequency offset information;
If community is FDD system, then described subscriber equipment determines that described precompensation frequency deviation value is Δ f × K, and wherein Δ f is described downlink frequency offset information, and K is the business of the specified center frequency point of the reference frequency of uplink baseband signal up-conversion and described cell downlink;
Correspondingly, described subscriber equipment carries out frequency deviation pre-compensation according to described precompensation frequency deviation value to described uplink baseband signal and specifically comprises:
Described subscriber equipment carries out single frequency deviation pre-compensation according to described precompensation frequency deviation value to described uplink baseband signal; Or
Described precompensation frequency deviation value is divided into the frequency deviation of uplink baseband channel distortion experienced integral multiple and the frequency deviation of little several times by described subscriber equipment, and respectively according to the frequency deviation of described integral multiple and the frequency deviation of described little several times, carries out frequency deviation pre-compensation to described uplink baseband signal.
10. a subscriber equipment, is characterized in that, comprising:
4th processing module, for carrying out frequency deviation pre-compensation to PRACH baseband signal;
5th processing module, for carrying out up-conversion and up transmission to the PRACH baseband signal after frequency deviation pre-compensation, from described upward signal, multiple sample sequence is obtained according to the multiple sampling windows preset respectively to make base station, described multiple sample sequence is carried out relevant to local sequence respectively, obtain multiple power delay spectrum, and using the peak-peak in described multiple power delay spectrum as winding time delay, complete Stochastic accessing according to described winding time delay;
Wherein, described 4th processing module comprises:
First processing module, for obtaining the specified center frequency point of cell downlink;
Second processing module, for obtaining downlink frequency offset information by Frequency Synchronization;
3rd processing module, for according to described downlink frequency offset information, carries out frequency deviation pre-compensation to uplink baseband signal.
11. subscriber equipmenies according to claim 10, it is characterized in that, described second processing module is specifically for being synchronized to described center frequency point by the reference frequency of down-conversion, and according to the reference frequency of the down-conversion after synchronous, the laggard line frequency of descending CF signal down-conversion received is estimated partially, obtain described downlink frequency offset information.
12. subscriber equipmenies according to claim 11, is characterized in that, described first processing module also obtains the specified center frequency point of described cell downlink for resolving from cell broadcast messages, or obtain the specified center frequency point of the cell downlink that presets.
13. subscriber equipmenies according to claim 12, it is characterized in that, described first processing module is also for determining according to formula fc=f (F_index)+fi*F_step the center frequency point that described cell downlink is specified, wherein, fc is the specified center frequency point of described cell downlink, F_index is the initial physics frequency of frequency range numbering indicated in cell broadcast messages, f (F_index) frequency range that frequency range numbering is corresponding indicated by F_index; Frequency sub-band numbering in the fi frequency range that frequency range numbering is corresponding indicated by F_index, the interval of the frequency sub-band in the F_step frequency range that frequency range numbering is corresponding indicated by F_index.
14. subscriber equipmenies according to claim 11, it is characterized in that, the reference frequency of described down-conversion also for utilizing external crystal-controlled oscillation or local crystal oscillator to provide reference frequency source, and according to described reference frequency source, is synchronized to described center frequency point by phase-locked loop by described second processing module.
15. subscriber equipmenies according to claim 11, it is characterized in that, described second processing module also for according to the reference frequency of the down-conversion after synchronous to different reception to the laggard line frequency of descending CF signal down-conversion partially estimate, obtain and upgrade described downlink frequency offset information.
16. subscriber equipmenies according to claim 10, it is characterized in that, described 3rd processing module also for according to described downlink frequency offset information, obtains the precompensation frequency deviation value of uplink baseband signal, and carries out frequency deviation pre-compensation according to described precompensation frequency deviation value to described uplink baseband signal; The center frequency point specified according to described cell downlink, arranges the reference frequency of the uplink baseband signal up-conversion after frequency deviation pre-compensation, and according to the reference frequency of described up-conversion, the uplink baseband signal after described frequency deviation pre-compensation is carried out to up-conversion and sends.
17. subscriber equipmenies according to claim 16, is characterized in that, if described 3rd processing module is also TDD system for community, place, then the reference frequency of described up-conversion are set to the specified center frequency point of described cell downlink; If community is FDD system, then to table look-up acquisition deviant according to " freqBandIndicator " field value in cell broadcast messages " SystemInformationBlockType1 " territory, and the reference frequency of described up-conversion is set to the difference of the specified center frequency point of described cell downlink and described deviant.
18. subscriber equipmenies according to claim 16, is characterized in that, if described 3rd processing module is also TDD system for community, then determine that described precompensation frequency deviation value is downlink frequency offset information; If community is FDD system, then determine that described precompensation frequency deviation value is Δ f × K, wherein Δ f is described downlink frequency offset information, and K is the business of the specified center frequency point of the reference frequency of uplink baseband signal up-conversion and described cell downlink; According to described precompensation frequency deviation value, single frequency deviation pre-compensation is carried out to described uplink baseband signal; Or described precompensation frequency deviation value is divided into the frequency deviation of uplink baseband channel distortion experienced integral multiple and the frequency deviation of little several times, and respectively according to the frequency deviation of described integral multiple and the frequency deviation of described little several times, frequency deviation pre-compensation is carried out to described uplink baseband signal.
19. 1 kinds of accidental access methods, is characterized in that, comprising:
The upward signal that base station receives user equipment sends, wherein said upward signal is that described subscriber equipment obtains the specified center frequency point of cell downlink, downlink frequency offset information is obtained by Frequency Synchronization, according to described downlink frequency offset information, compensate of frequency deviation is carried out to uplink baseband signal, and carries out the signal of up-conversion acquisition;
Described base station obtains multiple sample sequence according to the multiple sampling windows preset respectively from described upward signal, carries out relevant respectively, obtain multiple power delay spectrum by described multiple sample sequence to local sequence;
Peak-peak in described multiple power delay spectrum as winding time delay, and is completed Stochastic accessing according to described winding time delay by described base station;
Described baseband signal is Physical Random Access Channel PRACH baseband signal.
20. 1 kinds of base stations, is characterized in that, comprising:
6th processing module, for receiving the upward signal that subscriber equipment sends, wherein said upward signal is that described subscriber equipment obtains the specified center frequency point of cell downlink, downlink frequency offset information is obtained by Frequency Synchronization, according to described downlink frequency offset information, compensate of frequency deviation is carried out to uplink baseband signal, and carries out the signal of up-conversion acquisition;
7th processing module, for obtaining multiple sample sequence according to the multiple sampling windows preset respectively from described upward signal, carrying out relevant by described multiple sample sequence respectively to local sequence, obtaining multiple power delay spectrum; Using the peak-peak in described multiple power delay spectrum as winding time delay, and complete Stochastic accessing according to described winding time delay;
Described baseband signal is Physical Random Access Channel PRACH baseband signal.
21. 1 kinds of random access systems, is characterized in that, comprise the subscriber equipment according to any one of claim 10-18, and base station as claimed in claim 20.
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