CN102957461A - Downlink signal transmission method and wireless communication system - Google Patents
Downlink signal transmission method and wireless communication system Download PDFInfo
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- CN102957461A CN102957461A CN2011102414296A CN201110241429A CN102957461A CN 102957461 A CN102957461 A CN 102957461A CN 2011102414296 A CN2011102414296 A CN 2011102414296A CN 201110241429 A CN201110241429 A CN 201110241429A CN 102957461 A CN102957461 A CN 102957461A
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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 frequency deviation compensation technique field under the High-speed Circumstance.
Background technology
At present, the operation speed per hour of high-speed railway has reached 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 the high-speed railway covering scene, (User Equipment, be called for short: the Doppler frequency deviation that produces of advancing of high speed UE) makes the base station greatly descend to the quality of reception of upward signal to subscriber equipment.
Particularly, in the scene that UE advances at a high speed, there is Doppler frequency deviation in the downstream signal that the base station sends to UE in each subframe when arriving UE.The size of this Doppler frequency deviation is proportional to the travel rate of UE.If the carrier frequency of the downstream signal that the base station sends is f
0, the Doppler frequency deviation that causes is because the high speed of UE is advanced: Δ a, then the carrier frequency in the downstream signal that receives of UE is: f
0+ Δ a.UE adjusts the carrier frequency F of oneself by automatic frequency control
0Make F
0Equal as far as possible f
0+ Δ a.When the carrier frequency of UE was consistent with the carrier frequency of down channel, UE was with F
0=f
0+ Δ a sends upward signal, and the frequency when this signal arrives the base station is: f
0+ 2 Δ a.Therefore, the upward signal of base station reception is with respect to the carrier frequency f of base station
0Doppler frequency deviation be 2 Δ a.
When UE along the direction of UE and base station line with the speed of 430kmph during near the base station or away from the base station, the maximum of the absolute value of multi-frequency frequency deviation Δ a is about 800Hz, the maximum of the absolute value of the frequency deviation 2 Δ a of the upward signal that the base station receives is about 1600Hz.Existing Doppler frequency offset estimation method can't accurately estimate absolute value up to the Doppler frequency deviation of 1600Hz, and therefore, the base station will significantly descend to the quality of reception of upward signal.In fact, when the absolute value of the Doppler frequency deviation of upward signal near 1000Hz the time, existing Doppler frequency offset estimation method just can't be suitable for.
For addressing the above problem, can send upward signal at UE and upward signal be carried out the Doppler frequency deviation compensation, the Doppler frequency deviation when arriving the base station to reduce upward signal before to the base station.The method makes the base station be improved significantly to the quality of reception of upward signal.
Yet there is the problem of larger Doppler frequency deviation in the downstream signal that the method can't solve the base station that UE receives.The present invention will carry out the method for compensate of frequency deviation to upward signal based on above-mentioned, propose 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 to upward signal is being carried out on the basis of 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 sent upward signal to the base station, described UE determined the uplink frequency offset compensation rate, the upward signal that send is carried out the uplink frequency offset compensation, and the upward signal after will compensating sent to described base station;
Described UE will report described base station for the frequency information of the Doppler frequency deviation of the downstream signal of determining to send to described UE for described base station;
Described base station receives the upward signal after the described compensation that described UE sends, and estimates the Doppler frequency deviation of described upward signal;
The downstream signal of described UE is determined to send in described base station, and according to the estimated value of the Doppler frequency deviation of described upward signal and the frequency information that described UE reports described base station, determines the downlink frequency offset compensation rate of described downstream signal;
Described base station is carried out compensate of frequency deviation according to described downlink frequency offset compensation rate to described downstream signal; And the downstream signal after will compensating sends 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 is used for determining the uplink frequency offset compensation rate when sending upward signal to the base station; Up compensating module is used for the upward signal that will send is carried out the uplink frequency offset compensation, and the upward signal after the compensation is sent to described base station; Reporting module is used for being used for the described base station of confession and determines to send to the frequency information of Doppler frequency deviation of the downstream signal of described UE and report described base station;
Described base station comprises: receiver module is used for receiving the described frequency information that upward signal after the described compensation that described UE sends and described UE report; Estimation module is for the Doppler frequency deviation of estimating the described upward signal that receiver module receives; Descending determination module is used for determining to send to the downstream signal of described UE, and estimated value and the described frequency information of the Doppler frequency deviation of the described upward signal that obtains according to estimation module, determines the downlink frequency offset compensation rate of described downstream signal; Descending compensating module is used for the described downlink frequency offset compensation rate definite according to descending determination module, described downstream signal is carried out compensate of frequency deviation, and the downstream signal after will compensating sends to described UE.
The present invention realizes the compensate of frequency deviation to downstream signal on the basis of upward signal being carried out the uplink frequency offset compensation, thereby has improved the quality of reception of downstream signal.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do one to the accompanying drawing of required use in embodiment or the description of the Prior Art and introduce simply, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart of downstream signal sending method embodiment of the present invention;
Fig. 2 is burst structure schematic diagram described in the step 200 among Fig. 1;
Fig. 3 A～Fig. 3 C is the optional flow chart of step 200 among Fig. 1;
Fig. 4 is the optional flow chart of step 400 among Fig. 1;
Fig. 5 is the structural representation of wireless communication system embodiment of the present invention;
Fig. 6 is the optional structural representation of estimation module 22 shown in Figure 5;
Fig. 7 A～Fig. 7 C is the optional structural representation of reporting module 13 shown in Figure 5.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
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:
Particularly, described UE determines that the 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
0Be Doppler frequency deviation, F
0For described UE sends the carrier frequency of described upward signal, f
0Carrier frequency for described base station.
Mode two: when 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: when 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 according to ρ=-Δ b/ Δ c calculates described ρ.
Mode four: described UE determines described uplink frequency offset compensation rate Δ b according to Δ b=-ρ Δ c, and wherein, network disposed the scale factor to the described uplink frequency offset compensation rate of described UE and described base station simultaneously when ρ was described UE access network, ρ ∈ [0,2].
Step 200, described UE will report described base station for the frequency information of the Doppler frequency deviation of the downstream signal of determining to send to described UE for described base station.
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 the described method of present embodiment is applied to TD SDMA (Time Division-Synchronous Code Division Multiple Access, be called for short: in the time of TD-SCDMA) in the system, when having uplink special physical channel, (is not called for short: in the time of DPCH) UE, can be by radio network controller (Radio Network Controller, abbreviation: be that this UE distributes the stand-alone training sequence channel RNC).In the TD-SCDMA system, when described UE reports described base station with described frequency information, can in the stand-alone training sequence channel (Standalone Midamble Channel) of allocating in advance to this UE, described frequency information be sent to described base station.
As shown in Figure 2; in the TD-SCDMA system; the duration of a burst is exactly a time slot; the total length of a burst is 864 chips, and (be called for short: GP) at the protection interval that the training sequence territory that the data symbol territory that wherein to comprise two length be 352 chips, length are 144 chips and length are 16 chips.Distribute to the described stand-alone training sequence channel of described UE and only in the subframe of distributing to this channel and time slot, distribute to the corresponding training sequence of training sequence deviation of this channel to the base station by the channel code transmission of distributing to this channel, described training sequence only sends in the training sequence territory of described burst, two data symbol fields of described burst this moment are all on the shelf, thereby cause the wasting of resources.In order to cut the waste, present embodiment can further be taked corresponding measure, and the concrete process that reports will be introduced in subsequent content.
Obtain the frequency deviation estimated value of this upward signal when particularly, the Doppler frequency deviation of described upward signal is estimated in described base station
Wherein, described
Doppler frequency deviation Δ d=F for upward signal
0+ Δ b+ Δ c-f
0Estimated value, described Δ d is carrier frequency poor of the carrier frequency of the described upward signal that receives of described base station and the described base station upward signal that is used for receiving described UE.
Concrete Doppler frequency offset estimation method can adopt prior art, because described UE has carried out the uplink frequency offset compensation to upward signal, therefore can adopt prior art that the upward signal after compensating is realized the Doppler frequency deviation estimation, to obtain the uplink frequency offset estimated value
The downstream signal of described UE is determined to send in step 400, described base station, and according to the estimated value of the Doppler frequency deviation of described upward signal and the frequency information that described UE reports described base station, determines 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.
Particularly, wave beam forming is carried out to the downstream signal after compensating in described base station, then the downstream signal after will compensating by spread spectrum and carrier modulation sends to UE, and UE receives the downstream signal of this process compensate of frequency deviation, and base stations detected sends to the information bit sequence of UE from this time line number.Specifically can comprise following process:
At first, the definite transmitting power ρ that will send to information bit sequence He this information bit sequence of UE in base station encodes to this information bit sequence, then, the later information bit sequence of encoding is modulated, and obtains symbol sebolic addressing.
Particularly, described base station can obtain by existing ascending power control method the transmitting power of described information bit sequence, with b (n), and n=1,2 ..., N represents the symbol sebolic addressing that obtains through coded modulation, N represents the length of this symbol sebolic addressing.
Secondly, amplitude weighting, downlink frequency offset compensation and wave beam forming are carried out to symbol sebolic addressing in described base station.
Because there are difference in the frequency of the upward signal that the base station receives and the frequency of the downstream signal that UE receives, carry out channel estimating according to the upward signal that receives, should not be directly used in the wave beam forming of downstream signal according to channel estimation results according to the wave beam forming vector of existing wave beam forming vector generation method acquisition UE.But in the present invention, directly with this wave beam forming vector the downstream signal that sends to UE is carried out wave beam forming, the loss of the wave beam forming that causes thus can be ignored.
With the symbol sebolic addressing of process amplitude weighting, downlink frequency offset compensation and wave beam forming on k antenna of s (n, k) expression, then this symbol sebolic addressing is:
In the following formula, the component in x (k) the expression wave beam forming vector on k antenna, x=[x (1), x (2) ..., x ((K)] be the wave beam forming 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 that sends through carrier modulation is the downstream signal that sends to UE.
Below specify in the 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:
For described subscript i is reported described base station, be M with length
1The described subscript i of binary number representation.Particularly, network is given described UE configuration M when described UE access
1Value; Perhaps, the network described M that makes an appointment
1Value, described M
1Value to the access any UE all identical.
Wherein, when this sign bit is 0, expression symbol "+", corresponding uplink frequency offset compensation rate be on the occasion of; When this sign bit is 1, expression symbol "-", corresponding uplink frequency offset compensation rate is negative value.
Particularly, to representing the M of described i
1The M that individual bit and described sign bit cascade form
1+ 1 bit is modulated, and obtains L
1Individual symbol, wherein, M
1Be the length with the described subscript i of binary representation; In the data symbol territory of next-door neighbour front, described training sequence territory, send
Individual described symbol; In the data symbol territory of next-door neighbour back, described training sequence territory, send remaining
Individual described symbol.These symbols adopt the channel code of the described stand-alone training sequence channel of distributing to described UE and the scrambler of residential quarter to carry out spread spectrum.After this, described base station can restore described Δ b according to the symbol that receives.
For described mode two: when described frequency information is described Δ b and described Δ c, shown in Fig. 3 B, comprise the steps:
Step 220, described base station are calculated the subscript of described Δ b according to default minimum particle size m
And calculate the subscript of described Δ c
Wherein, be M with length
1The described subscript i of binary number representation, be M with length
2The described subscript j of binary number representation.Particularly, network is given described UE configuration M when described UE access
1And M
2Perhaps, the network described M that makes an appointment
1And M
2Value, described M
1And M
2Value all identical to any UE of described access.
Step 221, described UE arranges a sign bit according to the symbol of described Δ b, and according to the symbol of described Δ c one sign bit is set.
Wherein, when this sign bit is 0, expression symbol "+", corresponding amount on the occasion of; When this sign bit is 1, expression 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 representing two binary numbers and two M that described sign bit cascade forms of described i and j
1+ M
2+ 2 bits are modulated, and obtain L
2Individual symbol, wherein, M
1Be the length with the described subscript i of binary representation, M
2Be the length with the described subscript j of binary representation; In the data symbol territory of next-door neighbour front, described training sequence territory, send
Individual described symbol; In the data symbol territory of next-door neighbour back, described training sequence territory, send remaining
Individual described symbol.The channel code that the described stand-alone training sequence channel of distributing to described UE of can adopting these symbols adopts and the scrambler of residential quarter carry out spread spectrum.After this, described base station can restore described Δ b and Δ c according to the symbol that receives.
For described mode three: when described frequency information is described Δ b and ρ, shown in Fig. 3 C, comprise the steps:
Wherein, when this sign bit is 0, expression symbol "+", corresponding uplink frequency offset compensation rate be on the occasion of; When this sign bit is 1, expression symbol "-", corresponding uplink frequency offset compensation rate is negative value.Particularly, network is given described UE configuration M when described UE access
1And N; Perhaps, the network described M that makes an appointment
1With the value of N, described M
1All identical to any UE of described access with the value of N.
Particularly, to representing the M of described i
1Individual bit, described sign bit and represent N the M that the bit cascade forms of described ρ
1+ N+1 bit modulated, and obtains L
3Individual symbol, wherein, M
1Be the length with the described subscript i of binary representation; In the data symbol territory of next-door neighbour front, described training sequence territory, send
Individual described symbol; In the data symbol territory of next-door neighbour back, described training sequence territory, send remaining
Individual described symbol.The channel code that the described stand-alone training sequence channel that described UE is distributed in these symbols employings adopts and the scrambler of residential quarter carry out spread spectrum.After this, described base station can restore described Δ b and ρ according to the symbol that receives.
In addition, to above-mentioned M
1+ 1 bit, M
1+ M
2+ 2 bits are from reaching M
1The modulation system used when+N+1 bit modulated can be Quadrature Phase Shift Keying (Quadrature Phase Shift Keying, be called for short: QPSK), eight phase phase shift keyings (are called for short: 8PSK), 16 phase quadrature amplitude modulation (16 Quadrature Amplitude Modulation, 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 is by the network employing of making an appointment, and described modulation system is all identical to any UE of access.
By utilizing described data symbol territory to report described frequency information, be conducive to improve the utilance of resource.
Below specify definite process of above-mentioned steps 400 described downlink frequency offset compensation rate Δ g, as shown in Figure 4, comprising:
For aforesaid way one: described base station calculates Δ c=-Δ b/2 according to described Δ b;
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: described base station calculates Δ c=-Δ b/ ρ according to ρ and Δ b that UE reports;
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.
For example, described downlink frequency offset compensation rate is determined according to Δ g=-Δ e in described base station; Perhaps, when 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]; Perhaps, 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.
The described method of present embodiment realizes the compensate of frequency deviation to downstream signal on the basis of upward signal being carried out the uplink frequency offset compensation, thereby has improved the quality of reception of downstream signal.
Fig. 5 is the structural representation of wireless communication system embodiment of the present invention, and in order to realize said 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 the base station, determine the uplink frequency offset compensation rate by the up determination module 11 among the UE10, and by the uplink frequency offset compensation rates that up compensating module 12 is determined according to determination module 11 upward signal that will send is carried out the uplink frequency offset compensation, the upward signal after the compensation is sent to described base station.Particularly, described up determination module 11 determines that the mode of uplink frequency offset compensation rate can referring to aforesaid way one to mode four, repeat no more herein.
After this, will report described base station 20 for the frequency information of the Doppler frequency deviation of the downstream signal of determining to send to described UE for described base station 20 by reporting module 13.Particularly, this reporting module 13 can send to described base station with described frequency information 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 definite mode of different uplink frequency offset compensation rates, the content of the frequency information that reports also can be different, illustrates as follows:
When described frequency information was described Δ b, shown in Fig. 7 A, described reporting module 13 can be calculated by the first computing unit 1301 subscript of described Δ b according to default minimum particle size m
Wherein, int[x] represent real number x is rounded; Then according to the symbol of described Δ b one sign bit is set by the first setting unit 1302; 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 representing the M of described i
1The M that individual bit and described sign bit cascade form
1+ 1 bit is modulated, and obtains L
1Individual symbol, wherein, M
1Be the length with the described subscript i of binary representation; In the data symbol territory of next-door neighbour front, described training sequence territory, send
Individual described symbol; In the data symbol territory of next-door neighbour back, described training sequence territory, send remaining
Individual described symbol.
When described frequency information was described Δ b and Δ c, shown in Fig. 7 B, described reporting module 13 can be calculated by the second computing unit 1311 subscript of described Δ b according to default minimum particle size m
And calculate the subscript of described Δ c
Wherein, int[x] represent real number x is rounded; I≤j; Then according to the symbol of described Δ b one sign bit is set by the second setting unit 1312, and according to the symbol of described Δ c one sign bit is set; 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 the unit 1313 can be to representing the M of described i
1The M of individual bit, the described j of expression
2Individual bit and two M that described sign bit cascade forms
1+ M
2+ 2 bits are modulated, and obtain L
2Individual symbol, wherein, M
1Be the length with the described subscript i of binary representation, M
2Be the length with the described subscript j of binary representation; In the data symbol territory of next-door neighbour front, described training sequence territory, send
Individual described symbol; In the data symbol territory of next-door neighbour back, described training sequence territory, send remaining
Individual described symbol.
When described frequency information was described Δ b and ρ, shown in Fig. 7 C, described reporting module 13 was calculated the subscript of described Δ b according to default minimum particle size m by the 3rd computing unit 1321
Wherein, int[x] represent real number x is rounded; The 3rd setting unit 1322 arranges a sign bit according to the symbol of described Δ b, and with the described ρ of the binary number representation of N bit; The 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 the unit 1323 can be to representing the M of described i
1Individual bit, described sign bit and represent N the M that the bit cascade forms of described ρ
1+ N+1 bit modulated, and obtains L
3Individual symbol, wherein, M
1Be the length with the described subscript i of binary representation; In the data symbol territory of next-door neighbour front, described training sequence territory, send
Individual described symbol; In the data symbol territory of next-door neighbour back, described training sequence territory, send remaining
Individual described symbol.
After this, described base station 20 receives the described frequency information that upward signal after the described compensation that described UE10 sends and described UE10 report by receiver module 21, estimate the Doppler frequency deviation of the described upward signal that receiver module 21 receives by estimation module 22, particularly, as shown in Figure 6, this estimation module 22 is passed through first the first estimation unit 22A according to described Δ b, calculates Δ c=-Δ b/2, perhaps 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 the down-Doplet frequency deviation
Wherein, described
Doppler frequency deviation Δ d=F for upward signal
0+ Δ b+ Δ c-f
0Estimated value, described Δ d is carrier frequency poor of the carrier frequency of the described upward signal that receives of described base station and the described base station upward signal that is used for receiving described UE.
After this, determine to send to the downstream signal of described UE10 by descending determination module 23, and estimated value and the described frequency information of the Doppler frequency deviation of the described upward signal that obtains according to estimation module 22, determine the downlink frequency offset compensation rate of described downstream signal.Particularly, this descending determination module 23 can be determined described downlink frequency offset compensation rate Δ g according to Δ g=-Δ e; Perhaps, when Δ e＜0, described descending determination module is used for getting a value as Δ g in [0 ,-Δ e], and when Δ e 〉=0, described descending determination module is for get a value as Δ g in [Δ e, 0]; Perhaps, described descending determination module is used for the scale factor μ according to the downlink frequency offset compensation rate of described base station configuration, μ ∈ [0,1], and e determines described downlink frequency offset compensation rate according to Δ g=-μ Δ.
After this, the described downlink frequency offset compensation rate by descending compensating module 24 is determined according to descending determination module described downstream signal is carried out compensate of frequency deviation, and the downstream signal after will compensating sends to described UE10.Detailed process can be referring to the related description of said method embodiment.
The described system of present embodiment realizes the compensate of frequency deviation to downstream signal on the basis of upward signal being carried out the uplink frequency offset compensation, thereby has improved the quality of reception of downstream signal.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (37)
1. a downstream signal sending method is characterized in that, comprising:
When UE sent upward signal to the base station, described UE determined the uplink frequency offset compensation rate, the upward signal that send is carried out the uplink frequency offset compensation, and the upward signal after will compensating sent to described base station;
Described UE will report described base station for the frequency information of the Doppler frequency deviation of the downstream signal of determining to send to described UE for described base station;
Described base station receives the upward signal after the described compensation that described UE sends, and estimates the Doppler frequency deviation of described upward signal;
The downstream signal of described UE is determined to send in described base station, and according to the estimated value of the Doppler frequency deviation of described upward signal and the frequency information that described UE reports described base station, determines the downlink frequency offset compensation rate of described downstream signal;
Described base station is carried out compensate of frequency deviation according to described downlink frequency offset compensation rate to described downstream signal; And the downstream signal after will compensating sends to described UE.
2. method according to claim 1 is characterized in that, described UE determines that the 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
0Be Doppler frequency deviation, F
0For described UE sends the carrier frequency of described upward signal, f
0Carrier frequency for described base station; Described frequency information is described uplink frequency offset compensation rate Δ b.
3. method according to claim 1 is characterized in that, described UE determines that the uplink frequency offset compensation rate comprises: when 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 frequency information is described Δ b and described Δ c.
4. method according to claim 1 is characterized in that, described UE determines that the uplink frequency offset compensation rate comprises: when 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 according to ρ=-Δ b/ Δ c calculates described ρ, described frequency information is described Δ b and described ρ.
5. method according to claim 1, it is characterized in that, described UE determines that the uplink frequency offset compensation rate comprises: described UE determines described uplink frequency offset compensation rate Δ b according to Δ b=-ρ Δ c, wherein, network disposed the scale factor to the described uplink frequency offset compensation rate of described UE and described base station simultaneously when ρ was described UE access network, ρ ∈ [0,2]; Described frequency information is described Δ b.
6. each described method is characterized in that according to claim 2～5, and described base station obtains the frequency deviation estimated value of this upward signal when estimating the Doppler frequency deviation of described upward signal
Wherein, described
Doppler frequency deviation Δ d=F for upward signal
0+ Δ b+ Δ c-f
0Estimated value, described Δ d is carrier frequency poor of the carrier frequency of the described upward signal that receives of described base station and the described base station upward signal that is used for receiving described UE.
7. method according to claim 6 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 calculates Δ c=-Δ b/2 according to described Δ b, and perhaps described base station calculates Δ c=-Δ b/ ρ according to described ρ and described Δ b;
Described base station according to described Δ b,
And described Δ c calculates the down-Doplet frequency deviation
Described downlink frequency offset compensation rate is determined according to Δ g=-Δ e in described base station; Perhaps, when 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]; Perhaps, 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.
8. each described method according to claim 2～5, it is characterized in that, described UE sends to described base station with described frequency information and comprises: described UE sends to described base station with described frequency information 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.
9. method according to claim 8 is characterized in that, when described frequency information was described Δ b, described UE sent to described base station with described frequency information and comprises in pre-assigned stand-alone training sequence channel:
The subscript of described Δ b is calculated in described base station according to default minimum particle size m
Wherein, int[x] represent real number x is rounded;
Described UE arranges a sign bit according to the symbol of described Δ b;
Described UE reports described base station with described i and described sign bit in described data symbol territory.
10. method according to claim 9 is characterized in that, described UE reports described base station with described i and described sign bit and comprises in described two data symbol fields:
Use M
1Individual bit represents described i, to representing the M of described i
1The M that individual bit and described sign bit cascade form
1+ 1 bit is modulated, and obtains L
1Individual symbol, wherein, M
1Be the length with the described subscript i of binary representation;
In the data symbol territory of next-door neighbour front, described training sequence territory, send
Individual described symbol;
In the data symbol territory of next-door neighbour back, described training sequence territory, send remaining
Individual described symbol.
11. method according to claim 10 is characterized in that, the described M that uses
1Individual bit represents to comprise before the described i: network disposes M to described UE when described UE access
1Value; Perhaps, the network described M that makes an appointment
1Value, described M
1Value to the access any UE all identical.
12. method according to claim 8 is characterized in that, when described frequency information was described Δ b and Δ c, described UE sent to described base station with described frequency information and comprises in pre-assigned stand-alone training sequence channel:
The subscript of described Δ b is calculated in described base station according to default minimum particle size m
And calculate the subscript of described Δ c
Wherein, int[x] represent real number x is rounded; I≤j;
Described UE arranges a sign bit according to the symbol of described Δ b, and according to the symbol of described Δ c one sign bit is set;
Described UE reports described base station with described i, j and two described sign bits in described data symbol territory.
13. method according to claim 12, described UE reports described base station with described i, j and two described sign bits and comprises:
To representing the M of described i
1The M of individual bit, the described j of expression
2Individual bit and two M that described sign bit cascade forms
1+ M
2+ 2 bits are modulated, and obtain L
2Individual symbol, wherein, M
1Be the length with the described subscript i of binary representation, M
2Be the length with the described subscript j of binary representation;
In the data symbol territory of next-door neighbour front, described training sequence territory, send
Individual described symbol;
In the data symbol territory of next-door neighbour back, described training sequence territory, send remaining
Individual described symbol.
14. method according to claim 13 is characterized in that, and is described to representing the M of described i
1The M of individual bit, the described j of expression
2Individual bit and two M that described sign bit cascade forms
1+ M
2+ 2 bits also comprise before modulating: network is given described UE configuration M when described UE access
1And M
2Perhaps, the network described M that makes an appointment
1And M
2Value, described M
1And M
2Value all identical to any UE of described access.
15. method according to claim 8 is characterized in that, when described frequency information was described Δ b and ρ, described UE sent to described base station with described frequency information and comprises in pre-assigned stand-alone training sequence channel:
The subscript of described Δ b is calculated in described base station according to default minimum particle size m
Wherein, int[x] represent real number x is rounded;
Described UE arranges a sign bit according to the symbol of described Δ b, and with the described ρ of the binary number representation of N bit;
Described UE reports described base station with described i, described sign bit and described ρ in described data symbol territory.
16. method according to claim 15 is characterized in that, described UE reports described base station with described i, described sign bit and described ρ and comprises:
To representing the M of described i
1Individual bit, described sign bit and represent N the M that the bit cascade forms of described ρ
1+ N+1 bit modulated, and obtains L
3Individual symbol, wherein, M
1Be the length with the described subscript i of binary representation;
In the data symbol territory of next-door neighbour front, described training sequence territory, send
Individual described symbol;
In the data symbol territory of next-door neighbour back, described training sequence territory, send remaining
Individual described symbol.
17. method according to claim 16 is characterized in that, and is described to representing the M of described i
1Individual bit, described sign bit and represent N the M that the bit cascade forms of described ρ
1+ N+1 bit also comprises before modulating: network is given described UE configuration M when described UE access
1And N; Perhaps, the network described M that makes an appointment
1With the value of N, described M
1All identical to any UE of described access with the value of N.
18. method according to claim 10 is characterized in that, to described M
1+ 1 bit is modulated and is comprised: adopt the modulation system of QPSK, 8PSK, 16QAM or 64QAM to described M
1+ 1 bit is modulated, and described modulation system is by the network employing of making an appointment, and described modulation system is all identical to any UE of access.
19. method according to claim 18 is characterized in that, to described M
1+ 1 bit is modulated and is comprised: adopt the modulation system of QPSK to described M
1+ 1 bit is modulated.
20. method according to claim 13 is characterized in that, to described M
1+ M
2+ 2 bits are modulated and are comprised: adopt the modulation system of QPSK, 8PSK, 16QAM or 64QAM to described M
1+ M
2+ 2 bits are modulated, and described modulation system is by the network employing of making an appointment, and described modulation system is all identical to any UE of access.
21. method according to claim 20 is characterized in that, to described M
1+ M
2+ 2 bits are modulated and are comprised: adopt the modulation system of QPSK to described M
1+ M
2+ 2 bits are modulated.
22. method according to claim 16 is characterized in that, to described M
1+ N+1 bit modulated and comprised: adopt the modulation system of QPSK, 8PSK, 16QAM or 64QAM to described M
1Each and every one modulates+N+1 by bit, and described modulation system is by the network employing of making an appointment, and described modulation system is all identical to any UE of access.
23. method according to claim 22 is characterized in that, to described M
1+ N+1 bit modulated and comprised: adopt the modulation system of QPSK to described M
1+ N+1 bit modulated.
24. a wireless communication system is characterized in that, comprises UE and base station, wherein:
Described UE comprises:
Up determination module is used for determining the uplink frequency offset compensation rate when sending upward signal to the base station;
Up compensating module is used for the upward signal that will send is carried out the uplink frequency offset compensation, and the upward signal after the compensation is sent to described base station;
Reporting module is used for being used for the described base station of confession and determines to send to the frequency information of Doppler frequency deviation of the downstream signal of described UE and report described base station;
Described base station comprises:
Receiver module is used for receiving the described frequency information that upward signal after the described compensation that described UE sends and described UE report;
Estimation module is for the Doppler frequency deviation of estimating the described upward signal that receiver module receives;
Descending determination module is used for determining to send to the downstream signal of described UE, and estimated value and the described frequency information of the Doppler frequency deviation of the described upward signal that obtains according to estimation module, determines the downlink frequency offset compensation rate of described downstream signal;
Descending compensating module is used for the described downlink frequency offset compensation rate definite according to descending determination module, described downstream signal is carried out compensate of frequency deviation, and the downstream signal after will compensating sends to described UE.
25. system according to claim 24 is characterized in that, 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
0Be Doppler frequency deviation, F
0For described UE sends the carrier frequency of described upward signal, f
0Carrier frequency for described base station; Described frequency information is described uplink frequency offset compensation rate Δ b.
26. system according to claim 24 is characterized in that, when Δ c＜0, described up determination module is used for getting a value as described compensate of frequency deviation amount Δ b in [0 ,-2 Δ c] scope; When Δ c 〉=0, described up determination module is used for getting a value as described compensate of frequency deviation amount Δ b in [2 Δ c, 0] scope; Described frequency information is described Δ b and described Δ c.
27. system according to claim 24 is characterized in that, when Δ c＜0, described up determination module is used for getting a value as described compensate of frequency deviation amount Δ b in [0 ,-2 Δ c] scope; When Δ c 〉=0, described up determination module is used for getting a value as described compensate of frequency deviation amount Δ b in [2 Δ c, 0] scope; Described up determination module also be used for according to ρ=-Δ b/ Δ c calculates described ρ, described frequency information is described Δ b and described ρ.
28. system according to claim 24, it is characterized in that, described up determination module is used for determining described uplink frequency offset compensation rate Δ b according to Δ b=-ρ Δ c, wherein, network disposed the scale factor to the described uplink frequency offset compensation rate of described UE and described base station simultaneously when ρ was described UE access network, ρ ∈ [0,2]; Described frequency information is described Δ b.
29. each described system is characterized in that according to claim 25～28, the estimation module of described base station comprises:
The first estimation unit is used for according to described Δ b, calculates Δ c=-Δ b/2, and is perhaps described according to described ρ and described Δ b, calculates Δ c=-Δ b/ ρ;
The second estimation unit, be used for according to described Δ b,
And described Δ c calculates the down-Doplet frequency deviation
Wherein, described
Doppler frequency deviation Δ d=F for upward signal
0+ Δ b+ Δ c-f
0Estimated value, described Δ d is carrier frequency poor of the carrier frequency of the described upward signal that receives of described base station and the described base station upward signal that is used for receiving described UE.
30. system according to claim 29 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; Perhaps, when Δ e＜0, described descending determination module is used for getting a value as Δ g in [0 ,-Δ e], and when Δ e 〉=0, described descending determination module is for get a value as Δ g in [Δ e, 0]; Perhaps, described descending determination module is used for the scale factor μ according to the downlink frequency offset compensation rate of described base station configuration, μ ∈ [0,1], and e determines described downlink frequency offset compensation rate according to Δ g=-μ Δ.
31. each described system according to claim 25～28, it is characterized in that, described reporting module is used in pre-assigned stand-alone training sequence channel described frequency information being sent to described base station, and described stand-alone training sequence channel comprises a training sequence territory and two data symbol fields.
32. system according to claim 31 is characterized in that, when described frequency information was described Δ b, described reporting module comprised:
The first computing unit is used for the subscript that the default minimum particle size m of basis calculates described Δ b
Wherein, int[x] represent real number x is rounded;
The first setting unit is used for according to the symbol of described Δ b one sign bit being set;
First reports the unit, is used for described i and described sign bit are reported described base station in described data symbol territory.
33. system according to claim 32 is characterized in that, described first reports the unit to be used to M
1Individual bit represents described i, to representing the M of described i
1The M that individual bit and described sign bit cascade form
1+ 1 bit is modulated, and obtains L
1Individual symbol, wherein, M
1Be the length with the described subscript i of binary representation; In the data symbol territory of next-door neighbour front, described training sequence territory, send
Individual described symbol; In the data symbol territory of next-door neighbour back, described training sequence territory, send remaining
Individual described symbol.
34. system according to claim 31 is characterized in that, when described frequency information was described Δ b and Δ c, described reporting module comprised:
The second computing unit is used for the subscript that the default minimum particle size m of basis calculates described Δ b
And calculate the subscript of described Δ c
Wherein, int[x] represent real number x is rounded; I≤j;
The second setting unit is used for according to the symbol of described Δ b one sign bit being set, and according to the symbol of described Δ c one sign bit is set;
Second reports the unit, is used for described i, j and two described sign bits are reported described base station in described data symbol territory.
35. system according to claim 34, described second reports the unit to be used for representing the M of described i
1The M of individual bit, the described j of expression
2Individual bit and two M that described sign bit cascade forms
1+ M
2+ 2 bits are modulated, and obtain L
2Individual symbol, wherein, M
1Be the length with the described subscript i of binary representation, M
2Be the length with the described subscript j of binary representation; In the data symbol territory of next-door neighbour front, described training sequence territory, send
Individual described symbol; In the data symbol territory of next-door neighbour back, described training sequence territory, send remaining
Individual described symbol.
36. system according to claim 31 is characterized in that, when described frequency information was described Δ b and ρ, described reporting module comprised:
The 3rd computing unit is used for the subscript that the default minimum particle size m of basis calculates described Δ b
Wherein, int[x] represent real number x is rounded;
The 3rd setting unit is used for according to the symbol of described Δ b one sign bit being set, and with the described ρ of the binary number representation of N bit;
The 3rd reports the unit, is used for described i, described sign bit and described ρ are reported described base station in described data symbol territory.
37. system according to claim 36 is characterized in that, the described the 3rd reports the unit to be used for representing the M of described i
1Individual bit, described sign bit and represent N the M that the bit cascade forms of described ρ
1+ N+1 bit modulated, and obtains L
3Individual symbol, wherein, M
1Be the length with the described subscript i of binary representation; In the data symbol territory of next-door neighbour front, described training sequence territory, send
Individual described symbol; In the data symbol territory of next-door neighbour back, described training sequence territory, send remaining
Individual described symbol.
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