CN102957461B - Downlink signal transmission method and wireless communication system - Google Patents
Downlink signal transmission method and wireless communication system Download PDFInfo
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- CN102957461B CN102957461B CN201110241429.6A CN201110241429A CN102957461B CN 102957461 B CN102957461 B CN 102957461B CN 201110241429 A CN201110241429 A CN 201110241429A CN 102957461 B CN102957461 B CN 102957461B
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Abstract
The invention provides a downlink signal transmission method and a wireless communication system. The method includes that when transmitting an uplink signal to a base station, UE (user equipment) determines uplink frequency offset compensation amount, performs uplink frequency offset compensation for the uplink signal to be transmitted and transmits the compensated uplink signal to the base station; the UE reports frequency information, which is used for the base station to determine doppler frequency offset of a downlink signal transmitted to the UE, to the base station; the base station receives the compensated uplink signal transmitted by the UE and estimates doppler frequency offset of the uplink signal; the base station determines the downlink signal transmitted to the UE and determines downlink frequency offset compensation amount of the downlink signal according to an estimate value of the doppler frequency offset of the uplink signal and the frequency information reported by the UE to the base station; the base station performs frequency offset compensation for the downlink signal according to the downlink frequency offset compensation amount; and the base station transmits the compensated downlink signal to the UE. By the method and the system, receiving quality of the downlink signal is improved.
Description
Technical field
The present invention relates to a kind of downstream signal sending method and wireless communication system, belong to the Doppler shift compensation technique field under High-speed Circumstance.
Background technology
At present, the operation speed per hour of high-speed railway reaches 350kmph.The speed of service of magnetic suspended railway is especially up to 430kmph.Along with the increase of the mileage number of high-speed railway and magnetic suspended railway, the wireless coverage of high-speed railway has become a kind of typical covering scene of wireless communication field.Under high-speed railway covering scene, subscriber equipment (User Equipment, be called for short: high speed UE) advance produce Doppler shift the quality of reception of base station to upward signal is declined greatly.
Particularly, in the scene that UE advances at a high speed, when base station sends to the downstream signal of UE to arrive UE in each subframe, there is Doppler shift.The size of this Doppler shift is proportional to the travel rate of UE.If the carrier frequency of the downstream signal that base station sends is f
0, the Doppler shift caused of advancing of the high speed due to UE is: Δ a, then the carrier frequency in the downstream signal that receives of UE is: f
0+ Δ a.UE controls the carrier frequency F of adjustment oneself by automatic frequency
0make F
0equal f as far as possible
0+ Δ a.When the carrier frequency of UE and the carrier frequency of down channel consistent time, UE is with F
0=f
0+ Δ a sends upward signal, and frequency during this signal arrival base station is: f
0+ 2 Δ a.Therefore, the upward signal that receives of base station is relative to the carrier frequency f of base station
0doppler shift be 2 Δ a.
When UE along the direction of UE and base station line with the speed of 430kmph near base station or away from base station time, the maximum of the absolute value of multi-frequency frequency deviation Δ a is about 800Hz, and the maximum of the absolute value of the frequency deviation 2 Δ a of the upward signal that base station receives is about 1600Hz.Existing Doppler frequency offset estimation method accurately cannot estimate the Doppler shift of absolute value up to 1600Hz, and therefore, base station will significantly decline to the quality of reception of upward signal.In fact, when the absolute value of the Doppler shift of upward signal close to 1000Hz time, existing Doppler frequency offset estimation method just cannot be suitable for.
For solving the problem, can UE send upward signal to base station before Doppler shift compensation is carried out to upward signal, with reduce upward signal arrive base station time Doppler shift.The method makes the quality of reception of base station to upward signal be improved significantly.
But there is the problem of larger Doppler shift in the downstream signal that the method cannot solve the base station that UE receives.The present invention, by based on above-mentioned method of upward signal being carried out to compensate of frequency deviation, proposes a kind of sending method of downstream signal.
Summary of the invention
The invention provides a kind of downstream signal sending method and wireless communication system, in order on the basis of upward signal being carried out to compensate of frequency deviation, realize the compensate of frequency deviation to downstream signal.
One aspect of the present invention provides a kind of downstream signal sending method, comprising:
When UE sends upward signal to base station, described UE determines uplink frequency offset compensation rate, carries out uplink frequency offset compensation to the upward signal that will send, and the upward signal after compensating is sent to described base station;
Described UE determines to send to the frequency information of the Doppler shift of the downstream signal of described UE to report described base station for described base station by being used for;
Described base station receives the upward signal after the described compensation of described UE transmission, and estimates the Doppler shift of described upward signal;
The downstream signal sending to described UE is determined in described base station, and reports the frequency information of described base station according to the estimated value of the Doppler shift of described upward signal and described UE, determines the downlink frequency offset compensation rate of described downstream signal;
Compensate of frequency deviation, according to described downlink frequency offset compensation rate, is carried out to described downstream signal in described base station; And the downstream signal after compensating is sent to described UE.
The present invention provides a kind of wireless communication system on the other hand, comprises UE and base station, wherein:
Described UE comprises: up determination module, for when sending upward signal to base station, determines uplink frequency offset compensation rate; Upstream backoff module, for carrying out uplink frequency offset compensation to the upward signal that will send, sends to described base station by the upward signal after compensating; Reporting module, for determining to send to the frequency information of the Doppler shift of the downstream signal of described UE to report described base station for described base station by being used for;
Described base station comprises: receiver module, for receiving the upward signal after described compensation that described UE sends and the described frequency information that reports of described UE; Estimation module, for estimating the Doppler shift of the described upward signal that receiver module receives; Descending determination module, for determining the downstream signal sending to described UE, and the estimated value of the Doppler shift of the described upward signal obtained according to estimation module and described frequency information, determine the downlink frequency offset compensation rate of described downstream signal; Descending compensating module, for the described downlink frequency offset compensation rate determined according to descending determination module, carries out compensate of frequency deviation to described downstream signal, and the downstream signal after compensating is sent to described UE.
The present invention, on the basis of upward signal being carried out to uplink frequency offset compensation, realizes the compensate of frequency deviation to downstream signal, thus improves the quality of reception of downstream signal.
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 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 the flow chart of downstream signal sending method embodiment of the present invention;
Fig. 2 is the schematic diagram of burst structure described in step 200 in Fig. 1;
Fig. 3 A ~ Fig. 3 C is the optional flow chart of step 200 in Fig. 1;
Fig. 4 is the optional flow chart of step 400 in Fig. 1;
Fig. 5 is the structural representation of wireless communication system embodiment of the present invention;
The alternate configurations schematic diagram that Fig. 6 is estimation module 22 shown in Fig. 5;
The alternate configurations schematic diagram that Fig. 7 A ~ Fig. 7 C is reporting module 13 shown in Fig. 5.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is 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.
Fig. 1 is the flow chart of downstream signal sending method embodiment of the present invention, and as shown in the figure, the method comprises:
Step 100, UE send upward signal to base station time, described UE determines uplink frequency offset compensation rate, carries out uplink frequency offset compensation to the upward signal that will send, and by compensate after upward signal send to described base station.
Particularly, described UE determines that uplink frequency offset compensation rate can have following several mode:
Mode one: described UE determines described uplink frequency offset compensation rate according to Δ b=-2 Δ c; Wherein, Δ c=F
0-f
0for Doppler shift, F
0for described UE sends the carrier frequency of described upward signal, f
0for the carrier frequency of described base station.
Mode two: as Δ c < 0, described UE gets a value as described compensate of frequency deviation amount Δ b in [0 ,-2 Δ c] scope; When Δ c >=0, described UE gets a value as described compensate of frequency deviation amount Δ b in [-2 Δ c, 0] scope.
Mode three: as Δ c < 0, described UE gets a value as described compensate of frequency deviation amount Δ b in [0 ,-2 Δ c] scope; When Δ c >=0, described UE gets a value as described compensate of frequency deviation amount Δ b in [-2 Δ c, 0] scope; Described UE calculates described ρ according to ρ=-Δ b/ Δ c.
Mode four: described UE determines described uplink frequency offset compensation rate Δ b according to Δ b=-ρ Δ c, wherein, when ρ is described UE access network, network configures to the scale factor of the described uplink frequency offset compensation rate of described UE and described base station simultaneously, ρ ∈ [0,2].
Step 200, described UE determine to send to the frequency information of the Doppler shift of the downstream signal of described UE to report described base station for described base station by being used for.
For described mode one: described frequency information is described uplink frequency offset compensation rate Δ b.
For described mode two: described frequency information is described Δ b and described Δ c.
For described mode three: described frequency information is described Δ b and described ρ.
For described mode four: described frequency information is described Δ b.
Particularly, when method described in the present embodiment is applied to TD SDMA (Time Division-Synchronous Code Division Multiple Access, be called for short: time TD-SCDMA) in system, when UE does not have uplink special physical channel (to be called for short: time DPCH), can by radio network controller (Radio Network Controller, abbreviation: be RNC) that this UE distributes stand-alone training sequence channel.In TD-SCDMA system, when described frequency information is reported described base station by described UE, described frequency information can be sent to described base station allocating in advance in the stand-alone training sequence channel of this UE (Standalone Midamble Channel).
As shown in Figure 2; in TD-SCDMA system; the duration of a burst is exactly a time slot; the total length of a burst is 864 chips, wherein comprises data symbol territory that two length are 352 chips, protection interval that training sequence territory that length is 144 chips and length are 16 chips (is called for short: GP).The channel code transmission of described stand-alone training sequence channel only by distributing to this channel in the subframe distributing to this channel and time slot distributing to described UE distributes to the training sequence corresponding to training sequence deviation of this channel to base station, described training sequence only sends in the training sequence territory of described burst, two data symbol fields of now described burst are all on the shelf, thus cause the wasting of resources.In order to cut the waste, the present embodiment can take corresponding measure further, and the concrete process that reports will be introduced in subsequent content.
Step 300, described base station receive the upward signal after the described compensation of described UE transmission, and estimate the Doppler shift of described upward signal.
Particularly, the frequency deviation estimated value of this upward signal is obtained when the Doppler shift of described upward signal is estimated in described base station
wherein, described in
for the Doppler shift Δ d=F of upward signal
0+ Δ b+ Δ c-f
0estimated value, described Δ d is that the carrier frequency of the described upward signal that described base station receives and described base station are for receiving the difference of the carrier frequency of the upward signal of described UE.
Concrete Doppler frequency offset estimation method can adopt prior art, because described UE has carried out uplink frequency offset compensation to upward signal, prior art therefore can be adopted to realize Doppler shift to the upward signal after compensation and estimate, to obtain uplink frequency offset estimated value
Step 400, described base station determine the downstream signal sending to described UE, and report the frequency information of described base station according to the estimated value of the Doppler shift of described upward signal and described UE, determine the downlink frequency offset compensation rate of described downstream signal.
Described base station determines that the process of the downlink frequency offset compensation rate Δ g of described downstream signal will be introduced in subsequent content.
Step 500, described base station, according to described downlink frequency offset compensation rate, carry out compensate of frequency deviation to described downstream signal; And the downstream signal after compensating is sent to described UE.
Particularly, wave beam forming is carried out to the downstream signal after compensation in described base station, then by spread spectrum and carrier modulation, the downstream signal after compensating is sent to UE, UE receives this downstream signal through compensate of frequency deviation, and from this lower line number, base stations detected sends to the information bit sequence of UE.Specifically can comprise following process:
First, base station is determined to send to the information bit sequence of UE and the transmitting power ρ of this information bit sequence, encodes to this information bit sequence, then, modulates, obtain symbol sebolic addressing to the later information bit sequence of coding.
Particularly, described base station can obtain the transmitting power of described information bit sequence by existing ascending power control method, with b (n), n=1,2 ..., N represents the symbol sebolic addressing obtained through coded modulation, and N represents the length of this symbol sebolic addressing.
Secondly, amplitude weighting is carried out to symbol sebolic addressing in described base station, downlink frequency offset compensates and wave beam forming.
There is difference in the frequency of the downstream signal that the frequency of the upward signal received due to base station and UE receive, carry out channel estimating according to the upward signal received, should not be directly used in the wave beam forming of downstream signal according to channel estimation results according to the beamforming vector of existing beamforming vector generation method acquisition UE.But in the present invention, directly carry out wave beam forming with this beamforming vector to sending to the downstream signal of UE, the loss of the wave beam forming caused thus is negligible.
Represent with s (n, k) and a kth antenna compensates and the symbol sebolic addressing of wave beam forming through amplitude weighting, downlink frequency offset, then this symbol sebolic addressing is:
In above formula, x (k) represents the component in beamforming vector on a kth antenna, x=[x (1), x (2) ..., and x ((K)] be beamforming vector, K represents the number of antennas of base station; T
s=SFT
c, T
cbe the duration of 1 chip, SF is the spreading factor of baseband signal.
Then, spread spectrum and carrier modulation are carried out to the symbol sebolic addressing on each antenna in described base station.Particularly, when carrying out carrier modulation, the carrier frequency of base station is f
0, the signal sent through carrier modulation is the downstream signal sending to UE.
Below illustrate in above-mentioned steps 200, described UE is to the process of described base station reporting frequency information:
For described mode one and mode four: when described frequency information is described Δ b, as shown in Figure 3A, comprise the steps:
Step 210, described UE calculates the subscript of described Δ b according to the minimum particle size m preset
wherein, int [x] expression rounds real number x.
In order to described subscript i is reported described base station, be M by length
1binary number representation described in subscript i.Particularly, network configures M to described UE when described UE access
1value; Or network is made an appointment described M
1value, described M
1value to access any UE all identical.
Step 211, described UE sets a sign bit according to the symbol of described Δ b.
Wherein, when this sign bit is 0, represent symbol "+", corresponding uplink frequency offset compensation rate be on the occasion of; When this sign bit is 1, represent symbol "-", corresponding uplink frequency offset compensation rate is negative value.
Step 212, described UE will represent the M of described i
1individual bit and described sign bit report described base station in described data symbol territory.
Particularly, to the M representing described i
1the M of individual bit and described sign bit cascade
1+ 1 bit is modulated, and obtains L
1individual symbol, wherein, M
1for with the length of the described subscript i of binary representation; Send in data symbol territory before the described training sequence territory of next-door neighbour
individual described symbol; Send remaining in data symbol territory after the described training sequence territory of next-door neighbour
individual described symbol.These symbols adopt distributes to the channel code of described stand-alone training sequence channel of described UE and the scrambler of community carries out spread spectrum.After this, described base station can restore described Δ b according to the symbol received.
For described mode two: when described frequency information is described Δ b and described Δ c, as shown in Figure 3 B, comprise the steps:
Step 220, described base station calculates the subscript of described Δ b according to the minimum particle size m preset
and calculate the subscript of described Δ c
Wherein, be M by length
1binary number representation described in subscript i, be M by length
2binary number representation described in subscript j.Particularly, network configures M to described UE when described UE access
1and M
2; Or network is made an appointment described M
1and M
2value, described M
1and M
2any UE of value to described access all identical.
Step 221, described UE arranges a sign bit according to the symbol of described Δ b, and arranges a sign bit according to the symbol of described Δ c.
Wherein, when this sign bit is 0, represent symbol "+", corresponding amount on the occasion of; When this sign bit is 1, represent symbol "-", corresponding amount is negative value.
Step 222, described UE will represent the M of described i
1the M of individual bit and the described j of expression
2individual bit and two described sign bits report described base station in described data symbol territory.
Particularly, to expression two binary numbers of described i and j and the M of two described sign bit cascades
1+ M
2+ 2 bits are modulated, and obtain L
2individual symbol, wherein, M
1for with the length of the described subscript i of binary representation, M
2for with the length of the described subscript j of binary representation; Send in data symbol territory before the described training sequence territory of next-door neighbour
individual described symbol; Send remaining in data symbol territory after the described training sequence territory of next-door neighbour
individual described symbol.The scrambler of the channel code that these symbols can adopt the described stand-alone training sequence channel distributing to described UE to adopt and community carries out spread spectrum.After this, described base station can restore described Δ b and Δ c according to the symbol received.
For described mode three: when described frequency information is described Δ b and ρ, as shown in Figure 3 C, comprise the steps:
Step 230, described base station calculates the subscript of described Δ b according to the minimum particle size m preset
and be M by length
1binary number representation described in subscript i.
Step 231, described UE arranges a sign bit according to the symbol of described Δ b, and with ρ described in the binary number representation of N number of bit.
Wherein, when this sign bit is 0, represent symbol "+", corresponding uplink frequency offset compensation rate be on the occasion of; When this sign bit is 1, represent symbol "-", corresponding uplink frequency offset compensation rate is negative value.Particularly, network configures M to described UE when described UE access
1and N; Or network is made an appointment described M
1with the value of N, described M
1all identical with any UE of value to described access of N.
Step 232, described UE will represent the M of described i
1individual bit, described sign bit and represent that N number of bit of described ρ reports described base station in described data symbol territory.
Particularly, to the M representing described i
1individual bit, described sign bit and represent the M of N number of bit cascade of described ρ
1+ N+1 bit is modulated, and obtains L
3individual symbol, wherein, M
1for with the length of the described subscript i of binary representation; Send in data symbol territory before the described training sequence territory of next-door neighbour
individual described symbol; Send remaining in data symbol territory after the described training sequence territory of next-door neighbour
individual described symbol.The scrambler of the channel code that these symbols adopt the described stand-alone training sequence channel distributing to described UE to adopt and community carries out spread spectrum.After this, described base station can restore described Δ b and ρ according to the symbol received.
In addition, to above-mentioned M
1+ 1 bit, M
1+ M
2+ 2 bits from and M
1the modulation system that+N+1 bit uses when modulating can be: Quadrature Phase Shift Keying (Quadrature Phase Shift Keying, 8PSK), 16 phase quadrature amplitude modulation (16 Quadrature Amplitude Modulation be called for short: QPSK), eight phase phase shift keyings (are called for short:, be called for short: 16QAM) or 64 phase quadrature amplitude modulation (be called for short: 64QAM), wherein, preferred modulation system is QPSK.Described modulation system to be made an appointment employing by network, and any UE to access is identical for described modulation system.
By utilizing described data symbol territory to report described frequency information, be conducive to the utilance improving resource.
Below illustrate the deterministic process of the downlink frequency offset compensation rate Δ g described in above-mentioned steps 400, as shown in Figure 4, comprising:
Step 410, described base station obtain Δ c.
For aforesaid way one: described base station, according to described Δ b, calculates Δ c=-Δ b/2;
For aforesaid way two: described base station directly obtains Δ b and Δ c from the frequency information that UE reports;
For aforesaid way three: the ρ that described base station reports according to UE and Δ b, calculates Δ c=-Δ b/ ρ;
For aforesaid way four: the Δ b that described base station reports according to UE and network configuration calculate Δ c=-Δ b/ ρ to the ρ of UE.
Step 420, described base station according to described Δ b,
and described Δ c calculates down-Doplet frequency deviation
Step 430, described Δ g is determined according to described Δ e in described base station.
Such as, described downlink frequency offset compensation rate is determined according to Δ g=-Δ e in described base station; Or as Δ e < 0, a value is got as Δ g in described base station in [0 ,-Δ e], and when Δ e >=0, a value is got as Δ g in described base station in [-Δ e, 0]; Or, the scale factor μ of described base station configurating downlink compensate of frequency deviation amount, μ ∈ [0,1], and determine described downlink frequency offset compensation rate according to Δ g=-μ Δ e.
Method described in the present embodiment, on the basis of upward signal being carried out to uplink frequency offset compensation, realizes the compensate of frequency deviation to downstream signal, thus improves the quality of reception of downstream signal.
Fig. 5 is the structural representation of wireless communication system embodiment of the present invention, and use to implement the above described method, as shown in the figure, this system comprises UE10 and base station 20, and its operation principle is as follows:
When UE10 sends upward signal to base station, uplink frequency offset compensation rate is determined by the up determination module 11 in UE10, and the uplink frequency offset compensation rate determined according to determination module 11 by upstream backoff module 12 carries out uplink frequency offset compensation to the upward signal that will send, the upward signal after compensating is sent to described base station.Particularly, described up determination module 11 determines that the mode of uplink frequency offset compensation rate see aforesaid way one to mode four, can repeat no more herein.
After this, determined to send to the frequency information of the Doppler shift of the downstream signal of described UE to report described base station 20 for described base station 20 by being used for by reporting module 13.Particularly, described frequency information can be sent to described base station by this reporting module 13 in pre-assigned stand-alone training sequence channel, and described stand-alone training sequence channel comprises a training sequence territory and two data symbol fields.Corresponding to the determination mode of different uplink frequency offset compensation rates, the content of the frequency information reported also can be different, illustrates as follows:
When described frequency information is described Δ b, as shown in Figure 7 A, described reporting module 13 can calculate the subscript of described Δ b according to the minimum particle size m preset by the first computing unit 1301
wherein, int [x] expression rounds real number x; Then by the first setting unit 1302, one sign bit is set according to the symbol of described Δ b; And report unit 1303 that described i and described sign bit are reported described base station in described data symbol territory by first.Particularly, this first reports unit 1303 to use M
1individual bit represents described i, to the M representing described i
1the M of individual bit and described sign bit cascade
1+ 1 bit is modulated, and obtains L
1individual symbol, wherein, M
1for with the length of the described subscript i of binary representation; Send in data symbol territory before the described training sequence territory of next-door neighbour
individual described symbol; Send remaining in data symbol territory after the described training sequence territory of next-door neighbour
individual described symbol.
When described frequency information is described Δ b and Δ c, as shown in Figure 7 B, described reporting module 13 can calculate the subscript of described Δ b according to the minimum particle size m preset by the second computing unit 1311
and calculate the subscript of described Δ c
wherein, int [x] expression rounds real number x; I≤j; Then by the second setting unit 1312, one sign bit is set according to the symbol of described Δ b, and one sign bit is set according to the symbol of described Δ c; And report unit 1313 that described i, j and two described sign bits are reported described base station in described data symbol territory by second.Particularly, this second reports unit 1313 can to representing the M of described i
1individual bit, represent the M of described j
2the M of individual bit and two described sign bit cascades
1+ M
2+ 2 bits are modulated, and obtain L
2individual symbol, wherein, M
1for with the length of the described subscript i of binary representation, M
2for with the length of the described subscript j of binary representation; Send in data symbol territory before the described training sequence territory of next-door neighbour
individual described symbol; Send remaining in data symbol territory after the described training sequence territory of next-door neighbour
individual described symbol.
When described frequency information is described Δ b and ρ, as seen in figure 7 c, described reporting module 13 calculates the subscript of described Δ b according to the minimum particle size m preset by the 3rd computing unit 1321
wherein, int [x] expression rounds real number x; 3rd setting unit 1322 arranges a sign bit according to the symbol of described Δ b, and with ρ described in the binary number representation of N number of bit; 3rd reports unit 1323 that described i, described sign bit and described ρ are reported described base station in described data symbol territory.Particularly, the 3rd report unit 1323 can to representing the M of described i
1individual bit, described sign bit and represent the M of N number of bit cascade of described ρ
1+ N+1 bit is modulated, and obtains L
3individual symbol, wherein, M
1for with the length of the described subscript i of binary representation; Send in data symbol territory before the described training sequence territory of next-door neighbour
individual described symbol; Send remaining in data symbol territory after the described training sequence territory of next-door neighbour
individual described symbol.
After this, the described frequency information that upward signal after described base station 20 receives the described compensation of described UE10 transmission by receiver module 21 and described UE10 report, the Doppler shift of the described upward signal that receiver module 21 receives is estimated by estimation module 22, particularly, as shown in Figure 6, this estimation module 22 first passes through the first estimation unit 22A according to described Δ b, calculates Δ c=-Δ b/2, or described according to described ρ and described Δ b, calculate Δ c=-Δ b/ ρ; Then by the second estimation unit 22B according to described Δ b,
and described Δ c calculates down-Doplet frequency deviation
wherein, described in
for the Doppler shift Δ d=F of upward signal
0+ Δ b+ Δ c-f
0estimated value, described Δ d is that the carrier frequency of the described upward signal that described base station receives and described base station are for receiving the difference of the carrier frequency of the upward signal of described UE.
After this, determine by descending determination module 23 downstream signal sending to described UE10, and the estimated value of the Doppler shift of the described upward signal obtained according to estimation module 22 and described frequency information, determine the downlink frequency offset compensation rate of described downstream signal.Particularly, this descending determination module 23 can determine described downlink frequency offset compensation rate Δ g according to Δ g=-Δ e; Or as Δ e < 0, described descending determination module is used for getting a value as Δ g in [0 ,-Δ e], when Δ e >=0, described descending determination module is used for getting a value as Δ g in [-Δ e, 0]; Or described descending determination module is used for the scale factor μ of the downlink frequency offset compensation rate configured according to described base station, and μ ∈ [0,1], determines described downlink frequency offset compensation rate according to Δ g=-μ Δ e.
After this, the described downlink frequency offset compensation rate determined according to descending determination module by descending compensating module 24, carries out compensate of frequency deviation to described downstream signal, and the downstream signal after compensating is sent to described UE10.Detailed process can see the related description of said method embodiment.
System described in the present embodiment, on the basis of upward signal being carried out to uplink frequency offset compensation, realizes the compensate of frequency deviation to downstream signal, thus improves the quality of reception of downstream signal.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment 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 said method embodiment; 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 (29)
1. a downstream signal sending method, is characterized in that, comprising:
When UE sends upward signal to base station, described UE determines uplink frequency offset compensation rate, carries out uplink frequency offset compensation to the upward signal that will send, and the upward signal after compensating is sent to described base station;
Described UE determines to send to the frequency information of the Doppler shift of the downstream signal of described UE to report described base station for described base station by being used for;
Described base station receives the upward signal after the described compensation of described UE transmission, and estimates the Doppler shift of described upward signal;
The downstream signal sending to described UE is determined in described base station, and reports the frequency information of described base station according to the estimated value of the Doppler shift of described upward signal and described UE, determines the downlink frequency offset compensation rate of described downstream signal;
Compensate of frequency deviation, according to described downlink frequency offset compensation rate, is carried out to described downstream signal in described base station; And the downstream signal after compensating is sent to described UE;
Wherein, described UE determines that uplink frequency offset compensation rate comprises: described UE determines described uplink frequency offset compensation rate according to Δ b=-2 Δ c; Wherein, Δ c=F
0-f
0for Doppler shift, F
0for described UE sends the carrier frequency of described upward signal, f
0for the carrier frequency of described base station; Described frequency information is described uplink frequency offset compensation rate Δ b; Or,
As Δ c < 0, described UE gets a value as described uplink frequency offset compensation rate Δ b in [0 ,-2 Δ c] scope; When Δ c>=0, described UE gets a value as described uplink frequency offset compensation rate Δ b in [-2 Δ c, 0] scope; Wherein, Δ c=F
0-f
0for Doppler shift, F
0for described UE sends the carrier frequency of described upward signal, f
0for the carrier frequency of described base station; Described frequency information is described Δ b and described Δ c; Or,
As Δ c < 0, described UE gets a value as described uplink frequency offset compensation rate Δ b in [0 ,-2 Δ c] scope; When Δ c>=0, described UE gets a value as described uplink frequency offset compensation rate Δ b in [-2 Δ c, 0] scope; Wherein, Δ c=F
0-f
0for Doppler shift, F
0for described UE sends the carrier frequency of described upward signal, f
0for the carrier frequency of described base station; Described UE calculates described ρ according to ρ=-Δ b/ Δ c, and described frequency information is described Δ b and described ρ; Or,
Described UE determines described uplink frequency offset compensation rate Δ b according to Δ b=-ρ Δ c, and wherein, when ρ is described UE access network, network configures to the scale factor of the described uplink frequency offset compensation rate of described UE and described base station simultaneously, ρ ∈ [0,2]; Wherein, Δ c=F
0-f
0for Doppler shift, F
0for described UE sends the carrier frequency of described upward signal, f
0for the carrier frequency of described base station; Described frequency information is described Δ b.
2. method according to claim 1, is characterized in that, obtains the frequency deviation estimated value of this upward signal when the Doppler shift of described upward signal is estimated in described base station
wherein, described in
for the Doppler shift Δ d=F of upward signal
0+ Δ b+ Δ c-f
0estimated value, described Δ d is that the carrier frequency of the described upward signal that described base station receives and described base station are for receiving the difference of the carrier frequency of the upward signal of described UE.
3. method according to claim 2, is characterized in that, described base station determines that the downlink frequency offset compensation rate Δ g of described downstream signal comprises:
Described base station, according to described Δ b, calculates Δ c=-Δ b/2, or described base station is according to described ρ and described Δ b, calculates Δ c=-Δ b/ ρ;
Described base station according to described Δ b,
and described Δ c calculates down-Doplet frequency deviation
Described downlink frequency offset compensation rate is determined according to Δ g=-Δ e in described base station; Or as Δ e < 0, a value is got as Δ g in described base station in [0 ,-Δ e], and when Δ e >=0, a value is got as Δ g in described base station in [-Δ e, 0]; Or, the scale factor μ of described base station configurating downlink compensate of frequency deviation amount, μ ∈ [0,1], and determine described downlink frequency offset compensation rate according to Δ g=-μ Δ e.
4. method according to claim 1, it is characterized in that, described frequency information sends to described base station to comprise by described UE: described frequency information is sent to described base station by described UE in pre-assigned stand-alone training sequence channel, and described stand-alone training sequence channel comprises a training sequence territory and two data symbol fields.
5. method according to claim 4, is characterized in that, when described frequency information is described Δ b, described frequency information sends to described base station to comprise by described UE in pre-assigned stand-alone training sequence channel:
Described base station calculates the subscript of described Δ b according to the minimum particle size m preset
wherein, int [x] expression rounds real number x;
Described UE arranges a sign bit according to the symbol of described Δ b;
Described i and described sign bit are reported described base station by described UE in described data symbol territory.
6. method according to claim 5, is characterized in that, described i and described sign bit are reported described base station and comprise by described UE in described two data symbol fields:
Use M
1individual bit represents described i, to the M representing described i
1the M of individual bit and described sign bit cascade
1+ 1 bit is modulated, and obtains L
1individual symbol, wherein, M
1for with the length of the described subscript i of binary representation;
Send in data symbol territory before the described training sequence territory of next-door neighbour
individual described symbol;
Send remaining in data symbol territory after the described training sequence territory of next-door neighbour
individual described symbol.
7. method according to claim 6, is characterized in that, described M
1individual bit comprises before representing described i: network configures M to described UE when described UE access
1value; Or network is made an appointment described M
1value, described M
1value to access any UE all identical.
8. method according to claim 4, is characterized in that, when described frequency information is described Δ b and Δ c, described frequency information sends to described base station to comprise by described UE in pre-assigned stand-alone training sequence channel:
Described base station calculates the subscript of described Δ b according to the minimum particle size m preset
and calculate the subscript of described Δ c
wherein, int [x] expression rounds real number x; I≤j;
Described UE arranges a sign bit according to the symbol of described Δ b, and arranges a sign bit according to the symbol of described Δ c;
Described i, j and two described sign bits are reported described base station by described UE in described data symbol territory.
9. method according to claim 8, described i, j and two described sign bits are reported described base station and comprise by described UE:
To the M representing described i
1individual bit, represent the M of described j
2the M of individual bit and two described sign bit cascades
1+ M
2+ 2 bits are modulated, and obtain L
2individual symbol, wherein, M
1for with the length of the described subscript i of binary representation, M
2for with the length of the described subscript j of binary representation;
Send in data symbol territory before the described training sequence territory of next-door neighbour
individual described symbol;
Send remaining in data symbol territory after the described training sequence territory of next-door neighbour
individual described symbol.
10. method according to claim 9, is characterized in that, the described M to representing described i
1individual bit, represent the M of described j
2the M of individual bit and two described sign bit cascades
1+ M
2+ 2 bits also comprise before modulating: network configures M to described UE when described UE access
1and M
2; Or network is made an appointment described M
1and M
2value, described M
1and M
2any UE of value to described access all identical.
11. methods according to claim 4, is characterized in that, when described frequency information is described Δ b and ρ, described frequency information sends to described base station to comprise by described UE in pre-assigned stand-alone training sequence channel:
Described base station calculates the subscript of described Δ b according to the minimum particle size m preset
wherein, int [x] expression rounds real number x;
Described UE arranges a sign bit according to the symbol of described Δ b, and with ρ described in the binary number representation of N number of bit;
Described i, described sign bit and described ρ are reported described base station by described UE in described data symbol territory.
12. methods according to claim 11, is characterized in that, described i, described sign bit and described ρ are reported described base station and comprise by described UE:
To the M representing described i
1individual bit, described sign bit and represent the M of N number of bit cascade of described ρ
1+ N+1 bit is modulated, and obtains L
3individual symbol, wherein, M
1for with the length of the described subscript i of binary representation;
Send in data symbol territory before the described training sequence territory of next-door neighbour
individual described symbol;
Send remaining in data symbol territory after the described training sequence territory of next-door neighbour
individual described symbol.
13. methods according to claim 12, is characterized in that, the described M to representing described i
1individual bit, described sign bit and represent the M of N number of bit cascade of described ρ
1+ N+1 bit also comprises before modulating: network configures M when described UE access to described UE
1and N; Or network is made an appointment described M
1with the value of N, described M
1all identical with any UE of value to described access of N.
14. methods according to claim 6, is characterized in that, to described M
1+ 1 bit carries out modulation and comprises: adopt the modulation system of QPSK, 8PSK, 16QAM or 64QAM to described M
1+ 1 bit is modulated, and described modulation system to be made an appointment employing by network, and any UE to access is identical for described modulation system.
15. methods according to claim 14, is characterized in that, to described M
1+ 1 bit carries out modulation and comprises: adopt the modulation system of QPSK to described M
1+ 1 bit is modulated.
16. methods according to claim 9, is characterized in that, to described M
1+ M
2+ 2 bits carry out modulation and comprise: adopt the modulation system of QPSK, 8PSK, 16QAM or 64QAM to described M
1+ M
2+ 2 bits are modulated, and described modulation system to be made an appointment employing by network, and any UE to access is identical for described modulation system.
17. methods according to claim 16, is characterized in that, to described M
1+ M
2+ 2 bits carry out modulation and comprise: adopt the modulation system of QPSK to described M
1+ M
2+ 2 bits are modulated.
18. methods according to claim 12, is characterized in that, to described M
1+ N+1 bit carries out modulation and comprises: adopt the modulation system of QPSK, 8PSK, 16QAM or 64QAM to described M
1each and every one bit of+N+1 is modulated, and described modulation system to be made an appointment employing by network, and any UE to access is identical for described modulation system.
19. methods according to claim 18, is characterized in that, to described M
1+ N+1 bit carries out modulation and comprises: adopt the modulation system of QPSK to described M
1+ N+1 bit is modulated.
20. 1 kinds of wireless communication systems, is characterized in that, comprise UE and base station, wherein:
Described UE comprises:
Up determination module, for when sending upward signal to base station, determines uplink frequency offset compensation rate;
Upstream backoff module, for carrying out uplink frequency offset compensation to the upward signal that will send, sends to described base station by the upward signal after compensating;
Reporting module, for determining to send to the frequency information of the Doppler shift of the downstream signal of described UE to report described base station for described base station by being used for;
Described base station comprises:
Receiver module, for receiving the upward signal after described compensation that described UE sends and the described frequency information that reports of described UE;
Estimation module, for estimating the Doppler shift of the described upward signal that receiver module receives;
Descending determination module, for determining the downstream signal sending to described UE, and the estimated value of the Doppler shift of the described upward signal obtained according to estimation module and described frequency information, determine the downlink frequency offset compensation rate of described downstream signal;
Descending compensating module, for the described downlink frequency offset compensation rate determined according to descending determination module, carries out compensate of frequency deviation to described downstream signal, and the downstream signal after compensating is sent to described UE;
Wherein, described up determination module is used for determining described uplink frequency offset compensation rate according to Δ b=-2 Δ c; Wherein, Δ c=F
0-f
0for Doppler shift, F
0for described UE sends the carrier frequency of described upward signal, f
0for the carrier frequency of described base station; Described frequency information is described uplink frequency offset compensation rate Δ b; Or,
As Δ c < 0, described up determination module is used in [0 ,-2 Δ c] scope, getting a value as described uplink frequency offset compensation rate Δ b; When Δ c>=0, described up determination module is used in [-2 Δ c, 0] scope, getting a value as described uplink frequency offset compensation rate Δ b; Wherein, Δ c=F
0-f
0for Doppler shift, F
0for described UE sends the carrier frequency of described upward signal, f
0for the carrier frequency of described base station; Described frequency information is described Δ b and described Δ c; Or,
As Δ c < 0, described up determination module is used in [0 ,-2 Δ c] scope, getting a value as described uplink frequency offset compensation rate Δ b; When Δ c>=0, described up determination module is used in [-2 Δ c, 0] scope, getting a value as described uplink frequency offset compensation rate Δ b; Wherein, Δ c=F
0-f
0for Doppler shift, F
0for described UE sends the carrier frequency of described upward signal, f
0for the carrier frequency of described base station; Described up determination module is also for calculating described ρ according to ρ=-Δ b/ Δ c, and described frequency information is described Δ b and described ρ; Or,
Described up determination module is used for determining described uplink frequency offset compensation rate Δ b according to Δ b=-ρ Δ c, wherein, when ρ is described UE access network, network configures to the scale factor of the described uplink frequency offset compensation rate of described UE and described base station simultaneously, ρ ∈ [0,2]; Wherein, Δ c=F
0-f
0for Doppler shift, F
0for described UE sends the carrier frequency of described upward signal, f
0for the carrier frequency of described base station; Described frequency information is described Δ b.
21. systems according to claim 20, is characterized in that, the estimation module of described base station comprises:
First estimation unit, for according to described Δ b, calculates Δ c=-Δ b/2, or according to described ρ and described Δ b, calculates Δ c=-Δ b/ ρ;
Second estimation unit, for according to described Δ b,
and described Δ c calculates down-Doplet frequency deviation
wherein, described in
for the Doppler shift Δ d=F of upward signal
0+ Δ b+ Δ c-f
0estimated value, described Δ d is that the carrier frequency of the described upward signal that described base station receives and described base station are for receiving the difference of the carrier frequency of the upward signal of described UE.
22. systems according to claim 21, is characterized in that, described descending determination module is used for determining described downlink frequency offset compensation rate Δ g according to Δ g=-Δ e; Or as Δ e < 0, described descending determination module is used for getting a value as Δ g in [0 ,-Δ e], when Δ e >=0, described descending determination module is used for getting a value as Δ g in [-Δ e, 0]; Or described descending determination module is used for the scale factor μ of the downlink frequency offset compensation rate configured according to described base station, and μ ∈ [0,1], determines described downlink frequency offset compensation rate according to Δ g=-μ Δ e.
23. systems according to claim 20, it is characterized in that, described reporting module is used for, in pre-assigned stand-alone training sequence channel, described frequency information is sent to described base station, and described stand-alone training sequence channel comprises a training sequence territory and two data symbol fields.
24. systems according to claim 23, is characterized in that, when described frequency information is described Δ b, described reporting module comprises:
First computing unit, for calculating the subscript of described Δ b according to the minimum particle size m preset
wherein, int [x] expression rounds real number x;
First setting unit, for arranging a sign bit according to the symbol of described Δ b;
First reports unit, for described i and described sign bit are reported described base station in described data symbol territory.
25. systems according to claim 24, is characterized in that, described first reports unit for M
1individual bit represents described i, to the M representing described i
1the M of individual bit and described sign bit cascade
1+ 1 bit is modulated, and obtains L
1individual symbol, wherein, M
1for with the length of the described subscript i of binary representation; Send in data symbol territory before the described training sequence territory of next-door neighbour
individual described symbol; Send remaining in data symbol territory after the described training sequence territory of next-door neighbour
individual described symbol.
26. systems according to claim 23, is characterized in that, when described frequency information is described Δ b and Δ c, described reporting module comprises:
Second computing unit, for calculating the subscript of described Δ b according to the minimum particle size m preset
and calculate the subscript of described Δ c
wherein, int [x] expression rounds real number x; I≤j;
Second setting unit, for arranging a sign bit according to the symbol of described Δ b, and arranges a sign bit according to the symbol of described Δ c;
Second reports unit, for described i, j and two described sign bits are reported described base station in described data symbol territory.
27. systems according to claim 26, described second reports unit for the M to the described i of expression
1individual bit, represent the M of described j
2the M of individual bit and two described sign bit cascades
1+ M
2+ 2 bits are modulated, and obtain L
2individual symbol, wherein, M
1for with the length of the described subscript i of binary representation, M
2for with the length of the described subscript j of binary representation; Send in data symbol territory before the described training sequence territory of next-door neighbour
individual described symbol; Send remaining in data symbol territory after the described training sequence territory of next-door neighbour
individual described symbol.
28. systems according to claim 23, is characterized in that, when described frequency information is described Δ b and ρ, described reporting module comprises:
3rd computing unit, for calculating the subscript of described Δ b according to the minimum particle size m preset
wherein, int [x] expression rounds real number x;
3rd setting unit, for arranging a sign bit according to the symbol of described Δ b, and with ρ described in the binary number representation of N number of bit;
3rd reports unit, for described i, described sign bit and described ρ are reported described base station in described data symbol territory.
29. systems according to claim 28, is characterized in that, the described 3rd reports unit for the M to the described i of expression
1individual bit, described sign bit and represent the M of N number of bit cascade of described ρ
1+ N+1 bit is modulated, and obtains L
3individual symbol, wherein, M
1for with the length of the described subscript i of binary representation; Send in data symbol territory before the described training sequence territory of next-door neighbour
individual described symbol; Send remaining in data symbol territory after the described training sequence territory of next-door neighbour
individual described symbol.
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| CN102710270B (en) * | 2012-06-15 | 2014-04-30 | 深圳国人通信有限公司 | Radio remote unit and automatic frequency pre-controlling method and device thereof |
| CN105704076A (en) * | 2014-11-24 | 2016-06-22 | 中兴通讯股份有限公司 | Frequency offset correction method and device |
| CN106341357B (en) * | 2015-07-07 | 2020-04-03 | 中国移动通信集团公司 | Downlink frequency offset compensation method and device |
| US20170208600A1 (en) * | 2016-01-19 | 2017-07-20 | Mediatek Inc. | Methods for enhancing performance of a communications apparatus suffering from doppler effect and communications apparatus utilizing the same |
| CN109005135B (en) * | 2017-06-06 | 2022-06-17 | 中兴通讯股份有限公司 | Method and device for processing uplink frequency offset of communication system |
| CN112584412B (en) * | 2019-09-30 | 2023-10-03 | 华为技术有限公司 | Beam switching method and device and communication equipment |
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