CN101064701A - Method for transmitting measurement pilot and its user terminal, system - Google Patents
Method for transmitting measurement pilot and its user terminal, system Download PDFInfo
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Abstract
The invention relates to a method and user terminal, system which sends detecting pilot, the system includes base station and user terminal, the base station includes main and assistant frequency distributing module which distributes main frequency and assistant frequency for section communication, the base station communicates with user terminal, thereinto, the base station also includes frequency band using ensuring module which ensures the main frequency and assistant frequency used by user terminal, user terminal also includes frequency band using information generating module and detecting pilot sending module, the frequency band using information generating module generates corresponding frequency using information based on the ensuring information of frequency band using ensuring module and transmits it to the detecting pilot sending module, the detecting pilot sending module sends detecting pilot at least on frequency band used by user terminal based on the frequency using information. The detecting pilot and sending technique in the invention can decrease information quantity occupied by sending detecting pilot, and decrease the overhead of detecting pilot resource efficiently.
Description
Technical field
The present invention relates to wireless communication technology, particularly a kind of measurement pilot frequency transmission technology in frequency reuse system.
Background technology
Along with development of Communication Technique, mobile communication technology need be supported speech, data, audio frequency, video, multiple business types such as image.For supporting the polytype business, just require mobile communication system can support higher data rate, higher spectrum efficiency, and require it to possess perfect QoS security mechanism, and provide better mobility support and network seamless to cover, be embodied as the target that user terminal provides communication service whenever and wherever possible.
Some multi-transceiver technologies for improving system of broadband wireless communication capacity and spectrum utilization efficiency, developing, its basic thought is that a bandwidth carrier is divided into a plurality of subcarriers, and transmits data simultaneously on a plurality of subcarriers.In application, require the coherence bandwidth of the width of subcarrier less than system channel, the decline on each subcarrier is a flat fading like this, thereby can reduce intersymbol interference, and does not need complicated channel equalization, is fit to the transmission of high-speed data.
Multi-transceiver technology has various ways, as OFDM (OFDM, Orthogonal FrequencyDivision Multiplexing), CDMA multiple carrier (MC-CDMA, Multicarrier-Code DivisionMultiple Access), multicarrier is directly expanded CDMA (MC-DS-CDMA, Multicarrier-DirectSequence-Code Division Multiple Access), multi-tone CDMA (MT-CDMA, Multitone-Code Division Multiple Access), multicarrier TDMA (MC-TDMA, Multicarrier-Time Division Multiple Access), the time-frequency domain two-dimensional expansion, and the multiple expansion technique on above basis.
Wherein, the OFDM technology is more representational a kind of technology in the multi-transceiver technology, this technology is in frequency domain given channel to be divided into many orthogonal sub-channels, and allow subcarrier spectrum to overlap, as long as satisfy between subcarrier mutually orthogonally, just can isolate data-signal from the subcarrier of aliasing.
Be illustrated in figure 1 as a kind of ofdm system block diagram, its OFDM modulation and demodulation process comprises: user terminal data is at first passed through chnnel coding and interleaving treatment, and adopt certain modulation system, as two-phase system phase shift keyed signal (BPSK, Binary Phase Shift Keying) modulation, four-phase shift key control signals (QPSK, Quaternary Phase Shift Keying) modulation, quadrature amplitude modulation (QAM, Quadrature AmplitudeModulation) etc. form symbol; Carry out the OFDM operation then, through being modulated on the radio frequency after the OFDM operation.In carrying out the OFDM operating process, at first symbol is carried out the serial conversion, form the sub data flow of a plurality of low speed, each data flow takies a subcarrier.Sub data flow can be realized by an IDFT (inverse discrete fourier transform, Inverse Discrete Fourier Transform) or IFFT (inverse fast fourier transform, Inverse Fast Fourier Transform) to the mapping of subcarrier.Simultaneously its uses cyclic prefix CP as protection at interval, significantly reduces even eliminates intersymbol interference, and guarantee the orthogonality of each interchannel, thereby significantly reduce interchannel interference.
Ofdm system so peak-to-average power ratio (PAPR, peak to averagepower ratio) is higher, thereby can increase the cost and the power consumption of transmitter power amplifier owing to be to send frequency-region signal.For user terminal, because its cost and power consumption quantitative limitation, so OFDM is unfavorable for realizing in up link.Therefore, uply should adopt the lower modulation technique of PAPR as far as possible, improving power amplification efficiency, as DFT-S (discrete Fourier transform (DFT) expansion)-OFDM (DFT Spread OFDM) or have the OFDM of the PAPR technology of falling (subcarrier reservation, slicing).
Wherein, DFT-S-OFDM is a kind of Single Carrier Frequency Division Multiple Access (frequency division multiple access, Frequency Division Multiple Access) modulation technique that can realize dynamic bandwidth assignment flexibly, as shown in Figure 2, is the modulated process block diagram of DFT-S-OFDM.
Carry out constellation mapping earlier from bit bit to data symbol, if the DFT-S-OFDM block size is a N subcarrier, certain user terminal takies M subcarrier in the DFT-S-OFDM piece, M＜=N, at first M data symbol to certain user terminal carries out the DFT conversion, again the sign map of the M after the conversion (take M altogether, unappropriated subcarrier remains 0) to N subcarrier of DFT-S-OFDM piece.To N data carry out IFFT, and string conversion, add Cyclic Prefix after, just finish the modulation of a DFT-S-OFDM piece.Directly carry out the subcarrier mapping if user terminal data is not carried out DFT, it is exactly the OFDM modulation so.If N=M*L, and the M of a L user terminal symbol interweaved uniformly on N subcarrier, DFT-S-OFDM is equivalent to IFDMA (Interleaved Frequency DivisionMultiple Access) so.If do not take into account the sub-carrier distribution manner of row equivalent in IFDMA, so usually, the M of a user terminal data symbol is placed on one section continuous in N the subcarrier, because the PAPR of continuous dispensing subcarrier signals is littler than the PAPR of Random assignment subcarrier signals.
For effectively utilizing limited frequency spectrum resources, communication network is usually in different geographical position frequency reuse resources, be that wireless communication system utilizes the geographic area to distinguish, each communication zone in the wireless communication system can be called as a sub-district (cell), for example cellular radio Communication system.
As shown in Figure 3, for a kind of frequency re-use factor is 1 cellular network channeling schematic diagram, five jiaos of block representation sub-districts, the frequency 1 that grey colour specification is adopted, as shown in the figure, same frequency 1 transmission data are all adopted in each sub-district of this cellular network.Though being 1 multiplexing method, frequency re-use factor can utilize limited frequency spectrum resources well, but for frequency re-use factor 1 network, the user terminal that is in cell edge can be subjected to the interference from its adjacent cell, therefore the signal interference ratio of Cell Edge User terminal can reduce, thus, need to adopt some technology to improve the cell edge signal interference ratio.
And the simplest way of improving the cell edge signal interference ratio increases frequency duplex factor as one exactly, as shown in Figure 4, it for a kind of multiplexing factor 3 cellular network channeling schematic diagram, with frequency partition is three sub-frequencies: frequency 1,2,3, concerning cellular network, the multiplexing factor 3 can guarantee that the frequency of any two neighbor cells use is all different, is merely able to use 1/3 original frequency but its shortcoming is each sub-district.
Therefore, a kind of frequency soft multiplexing technology for further improving spectrum utilization efficiency, developing, its main thought is: frequency duplex factor as one greater than 1 is adopted in the more serious cell edge area of interference ratio, then adopt 1 frequency duplex factor as one in inside, sub-district.
The frequency soft multiplexing technology specifically as shown in Figure 5, with the multiplexing factor is 3 example, is 3 to divide frequencies with all subcarriers in the multicarrier system according to the multiplexing factor, obtains three dominant frequency: dominant frequency 1,2,3, as the clause part among Fig. 3, each sub-district obtains dominant frequency separately.Be specially,, select a frequency as its dominant frequency for certain concrete sub-district, the frequency beyond its gained dominant frequency is frequently secondary as it, such as for sub-district 1,1 the inside just becomes frequently secondary in the sub-district for dominant frequency 2,3.Dominant frequency is mainly used in the communication of cell edge, the secondary communication that is mainly used in inside, sub-district frequently.
For avoiding the shortcoming of frequency multiplexing method shown in Figure 4, dominant frequency and secondary transmitting power frequently to need be done some restrictions usually, the transmitting power thresholding that generally is dominant frequency is than secondary transmitting power thresholding height frequently.If dominant frequency is the same with secondary transmitting power frequently, it is 1 that so soft multiplexing just degeneration becomes the multiplexing factor.In addition, from the dominant frequency and secondary frequently the zone of action, the secondary zone of action frequently is to be equivalent to general channeling at 0 o'clock; It is 1 that the secondary zone of action frequently is equivalent to the multiplexing factor when being whole sub-district.
Soft multiplexing similar with said frequencies, can also adopt the method for partial frequency multiplexing, improve spectrum utilization efficiency: frequency duplex factor as one greater than 1 is adopted in the more serious cell edge area of interference ratio, then adopt 1 frequency duplex factor as one in inside, sub-district.
Specifically as shown in Figure 6, be that 3 example illustrates with the multiplexing factor of dominant frequency, the subcarrier in the multicarrier system is divided into 2 parts: dominant frequency and frequently secondary.Concerning the pair frequency, its multiplexing factor is 1; The multiplexing factor of dominant frequency is 3, is about to the dominant frequency part and is divided into three sub-dominant frequency parts again: sub-dominant frequency 1,2,3, and as the striped part among Fig. 6, each sub-district obtains sub-dominant frequency separately, and identical secondary frequency is adopted in all sub-districts.Sub-dominant frequency is mainly used in the communication of cell edge, the secondary communication that is mainly used in inside, sub-district frequently.
No matter but which kind of frequency multiplexing method is communication system adopt, the decline of wireless channel is frequency selectivity normally, that is to say, at a time, decline on the subcarrier in correlation bandwidth of a certain user terminal can be thought identical, but it is identical that the decline on the farther subcarrier just can not be thought, and the decline of different user terminals is normally different.So, if the decline value of each user terminal on each subcarrier can be known in the base station, so the base station just can based on certain dispatching criterion be different user terminals select as far as possible they separately the reasonable subcarrier of condition transmit data, thereby make that the propagation conditions of most user terminals is all relatively good, realize the multiple users diversity gain, improve spectrum efficiency.
Realize the multiple users diversity gain by the scheduling on frequency domain, transmitting terminal just must be known the instantaneous fading value of all user terminals on all subcarriers.For TDD (Time Division Duplexing) system, because same frequency band is adopted in up-downgoing, the pilot tone that transmitting terminal can directly receive by detection is estimated channel; For FDD (Frequency Division Duplexing) system, because different frequency bands is used in up-downgoing, the decline of up-downgoing channel is different, therefore must channel information be returned to transmitting terminal by the link of another direction.But no matter be the pilot tone of TDD and the back information of FDD, they all belong to the feedback of channel quality indication, wish that all its shared resource is few more good more, give user terminal data to reserve resource as much as possible.
As shown in Figure 7, be a DFT-s-OFDM schematic diagram that 16 subcarriers are arranged, wherein abscissa is represented the numbering of time domain DFT-s-OFDM symbol (Block), ordinate is represented the subcarrier in frequency domain numbering.With LTE sub-frame of uplink structure is example, and each TTI comprises 8 DFT-s-OFDM symbols, wherein is numbered 1 and 6 symbol generally as frequency pilot sign.The basic role of pilot tone has two, and one is to carry out channel estimating to be used for coherent demodulation and detection, and another is to carry out channel quality measurement to be used for scheduling.Therefore frequency pilot sign can not be all as measurement pilot frequency, it must with the channel estimating pilot frequency multiplexing, among Fig. 7 half pilot sub-carrier is used for measurement pilot frequency, half leaves the channel estimating pilot tone for.The multiplexing method of measurement pilot frequency and channel estimating pilot tone is a lot, for example, can be with a frequency pilot sign, as the channel estimating pilot tone, frequency pilot sign such as DFT-s-OFDM symbol 6 are as measurement pilot frequency as DFT-s-OFDM symbol 1.
Consider that the subcarrier in coherence bandwidth has approximate decline value, therefore can be divided into some adjacent subcarriers a subband, user terminal can send one group of measurement pilot frequency at each subband, so and needn't all send measurement pilot frequency on subcarrier.As shown in Figure 7, can be divided into a subband to 4 adjacent subcarriers, such one has the DFT-s-OFDM system of 16 subcarriers can be divided into 4 subbands, in the regular hour, in a TTI, only need to send 4 groups of measurement pilot frequency and get final product, and need not to send 16 groups, thereby reduce the measurement pilot frequency expense greatly.
Though above-mentioned technical scheme can effectively reduce the measurement pilot frequency expense by dividing subband, user terminal still need send measurement pilot frequency on all subbands, and expense is still bigger.Expand to such as time delay under the wireless channel environment of 5 microseconds at channel, the coherence bandwidth Xiao Yu 200KHz of channel, the system bandwidth of 20MHz need be divided about 100 subbands at least like this, if all subbands all send measurement pilot frequency, its expense is still bigger.If only be divided into 10 subbands, then subband can cause channel quality measurement inaccurate considerably beyond coherence bandwidth, causes the throughput of user terminal to descend.
Summary of the invention
In view of this, the invention provides a kind of method that sends measurement pilot frequency and user terminal thereof, system, can effectively reduce the expense of measurement pilot frequency.
A kind of method that sends measurement pilot frequency wherein, comprising:
Steps A in frequency reuse system, is used for the dominant frequency and the secondary frequency of cell communication for each cell allocation;
Step B determines that user terminal uses dominant frequency, secondary operating position frequently;
Step C, user terminal uses dominant frequency, secondary situation frequently to send measurement pilot frequency at least on its employed frequency band according to it.
A kind of measurement pilot frequency transmitting system, this system is a frequency reuse system, mainly comprise base station and user terminal, this base station comprises that further the major-minor frequency division joins module, the major-minor frequency division is joined module is used for cell communication for each cell allocation dominant frequency and secondary frequency, then base station and user terminal communicate according to the frequency band of above-mentioned distribution, wherein, the base station comprises that also being used for definite user terminal uses dominant frequency, secondary frequency band frequently uses determination module, user terminal comprises that also frequency band uses information-generation module and measurement pilot frequency sending module, frequency band uses information-generation module to use the affirmation information of determination module to produce frequency band according to described frequency band and uses information and pass to the measurement pilot frequency sending module, and the measurement pilot frequency sending module uses information to send measurement pilot frequency at least on the employed frequency band of user terminal according to this frequency band.
A kind of user terminal, this user terminal is used for communicating with the base station, wherein, this user terminal comprises that frequency band uses information-generation module and measurement pilot frequency sending module, frequency band uses information-generation module to use dominant frequency, secondary behaviour in service frequently to produce frequency band and use information and pass to the measurement pilot frequency sending module according to this user terminal, and the measurement pilot frequency sending module uses information to send measurement pilot frequency at least on the employed frequency band of user terminal according to this frequency band.
If described user terminal only uses dominant frequency, and known this operating position of user terminal, then user terminal only sends measurement pilot frequency on this dominant frequency.
If described user terminal only uses dominant frequency, and user terminal do not know this operating position, and then user terminal needs respectively in the dominant frequency of its affiliated subdistrict and secondaryly sends measurement pilot frequency on frequently.
If user terminal only uses frequently secondary, and known this operating position of user terminal, then user terminal only sends measurement pilot frequency in this pair frequently.
Secondary and user terminal do not know this operating position frequently if user terminal only uses, and then user terminal needs respectively in the dominant frequency of its affiliated subdistrict and secondaryly sends measurement pilot frequency on frequently.
If described user terminal had both used dominant frequency, also use is frequently secondary, no matter whether user terminal knows this operating position so, user terminal all needs the while to send measurement pilot frequency in the dominant frequency and the pair of its affiliated subdistrict frequently.
Compared with prior art, a kind of method that sends measurement pilot frequency of the present invention and user terminal thereof, system, because whether user terminal can only take dominant frequency, frequently secondary according to current its, or take major-minor simultaneously frequently, at least on the employed frequency band of user terminal, send the out-hole run pilot tone respectively targetedly respectively, therefore, measurement pilot frequency transmission technology of the present invention can further reduce the amount of information that measurement pilot frequency transmission information takies, and effectively reduces the expense of measurement pilot frequency resource.
Description of drawings
Fig. 1 is a kind of ofdm system block diagram of prior art.
Fig. 2 is the modulated process block diagram of a kind of DFT-S-OFDM of prior art.
Fig. 3 is that a kind of frequency re-use factor of prior art is 1 cellular network channeling schematic diagram.
Fig. 4 is that a kind of multiplexing factor of prior art is 3 cellular network channeling schematic diagram.
Fig. 5 is that a kind of frequency duplex factor as one of prior art is 3 cellular network frequency soft multiplexing schematic diagram.
Fig. 6 is the soft multiplexing schematic diagrames of 3 cellular network component frequencies for a kind of frequency duplex factor as one of prior art.
Fig. 7 is the individual DFT-s-OFDM schematic diagram that 16 subcarriers are arranged of one of prior art.
Fig. 8 is the workflow block diagram of the measurement pilot frequency transmission of the present invention's better embodiment.
Fig. 9 is divided into the schematic diagram of subband for the subcarrier of the present invention's better embodiment.
Figure 10 is the measurement pilot frequency transmitting system block diagram of the present invention's better embodiment.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer,, the present invention is described in further detail below in conjunction with embodiment and accompanying drawing.
The present invention a kind of sends the method for measurement pilot frequency and user terminal thereof, system, be not only applicable to frequency soft multiplexing system, equally also be applicable to the system that adopts some other channeling interference coordination technique such as partial frequency multiplexing, but be the convenience of describing, better embodiment of the present invention all is that example describes with the frequency soft multiplexing system.
In frequency reuse system, a user terminal only takies dominant frequency or side frequency usually, therefore can utilize multiplexing dominant frequency, secondary characteristics frequently, makes user terminal send measurement pilot frequency targetedly, thereby reduces the expense of measurement pilot frequency.Be specially user terminal according to current its shared be dominant frequency or frequently secondary, with and whether know that this use information comes to send at least respectively the out-hole run pilot tone on corresponding employed frequency band, specific as follows described.
As shown in Figure 8, be the method course of work block diagram of the transmission measurement pilot frequency of the present invention's one better embodiment, it mainly comprises step as described below.
In frequency reuse system, whole frequency band is divided into several subbands, the relation that subcarrier is divided into subband can immobilize, and also can carry out dynamic change according to the time, but the i.e. grouping random variation of subcarrier.
In this better embodiment, as shown in Figure 9, system has 16 subcarriers, and all subcarriers of system are divided into 4 groups, promptly is divided into 4 subbands: subband 1,2,3,4, each subband comprise 4 continuous subcarriers.
System takies 1/3 frequency band according to dominant frequency, and secondary 2/3 the rule of frequently taking is each cell allocation dominant frequency and frequently secondary, but can adjust in the reality, as adjusting according to business demand.
In frequency soft multiplexing system, the method of each cell allocation dominant frequency and secondary frequency is, system passes through base station controller, for different neighbor cells is selected the dominant frequency of above-mentioned different subband as this sub-district, other subband is frequently secondary as this sub-district, dominant frequency is mainly used in the communication of Cell Edge User terminal, the secondary communication that is mainly used in sub-district internal user terminal frequently.
In the component frequency soft multiplexing system, the method for each cell allocation dominant frequency and secondary frequency is that the subcarrier in the multicarrier system is divided into 2 parts: dominant frequency and frequently secondary.Concerning the pair frequency, its multiplexing factor is 1; The multiplexing factor of dominant frequency is 3, is about to the dominant frequency part and is divided into three sub-dominant frequency parts again according to the sub-district: sub-dominant frequency 1,2,3, and as the striped part among Fig. 6, each sub-district obtains sub-dominant frequency separately, and identical secondary frequency is adopted in all sub-districts.Sub-dominant frequency is mainly used in the communication of cell edge, the secondary communication that is mainly used in inside, sub-district frequently.
The dominant frequency of each sub-district frequently is provided with different transmitting power thresholdings with secondary, and the transmitting power thresholding of dominant frequency is higher than secondary transmitting power thresholding frequently, determines cell boarder with the coverage of dominant frequency.Like this, for inside, sub-district, the main low-power pair that adopts keeps pouring in defeated user terminal data, because closer from the base station, user terminal can receive this sub-district signal clearly, and because secondary frequency power is little, interference ratio to neighbor cell is less, i.e. the user terminal of inside, sub-district is because each base station is by the restriction to transmitting power, can not be subjected to the interference of adjacent base station signal, perhaps disturb very little; And at each neighbor cell fringe region, adopt high power dominant frequency transmission user terminal data, what be in that the user terminal of fringe region mainly receives is the dominant frequency of its affiliated subdistrict, because the dominant frequency non-overlapping of different neighbor cells is not in on the frequency, be in quadrature, so the phase mutual interference will reduce greatly.
In addition, the division that subcarrier is divided into subband and dominant frequency and secondary frequency can immobilize, also can carry out dynamic change according to the time, but the distribution random variation of i.e. grouping of subcarrier and dominant frequency and secondary frequency, as long as neighbor cell does not use same subband simultaneously in guaranteeing at one time.
This better embodiment, as shown in Figure 9, system has 16 subcarriers, be divided into subband 1,2,3,4, each subband comprises 4 continuous subcarriers, for certain concrete sub-district, suppose that for sub-district 1 subband 4 is dash area as the dominant frequency of sub-district 1 as subband among Fig. 94; Subband 1,2,3 is frequently secondary as sub-district 1, as the blank parts among Fig. 9.And, select the dominant frequency of subband 1,2,3 one of them subband as its sub-district to any one neighbor cell of sub-district 1, two subbands in addition in addition and subband 4 are frequently secondary as its sub-district.
Step 103 determines whether user terminal only uses dominant frequency, only use frequently secondary or use major-minor frequently simultaneously;
To certain sub-district, when certain user terminal in it need transmit data, user terminal was to base station feedback current C QI information, and the base station is according to the CQI information of active user's terminal, determine that whether this user terminal only uses dominant frequency, only uses secondary frequency, perhaps uses major-minor frequently simultaneously.
Generally be, the base station is a use subcarrier situation of determining user terminal according to the interference size, and when promptly disturbing big (it is poor to can be regarded as CQI), this user terminal only uses dominant frequency; When disturbing little (it is good to can be regarded as CQI), user terminal only uses frequently secondary; But in actual applications, also to consider the user terminal data conditions of demand simultaneously,, may will use major and minor frequency simultaneously if when the user terminal data amount is very big.
Whether only use dominant frequency, only use frequently secondaryly for user terminal, perhaps still use major-minor situation frequently simultaneously, the broadcast channel informing user terminal can also be passed through in the base station, also can pass through other channel notification user terminal, also informing user terminal not.
Whether user terminal only uses dominant frequency, only uses frequently secondary or uses major-minor frequency band frequently to use information simultaneously according to it, and whether notify this operating position by broadcast channel according to the base station, user terminal send measurement pilot frequency corresponding major and minor taking place frequently respectively, and is specific as follows described.
If user terminal only uses dominant frequency, and the base station is by the broadcast channel informing user terminal, i.e. known this operating position of user terminal, and then user terminal only sends measurement pilot frequency on dominant frequency.As shown in Figure 9, if certain user terminal of sub-district 1 only uses dominant frequency, and the base station notifies this user terminal by broadcast channel, then this user terminal only the dominant frequency in sub-district 1 be to send measurement pilot frequency on the subband 4.
If user terminal only uses dominant frequency, and the base station is by the broadcast channel informing user terminal, then user terminal need at its affiliated subdistrict dominant frequency, secondaryly send measurement pilot frequency on frequently.As shown in Figure 9, if certain user terminal of sub-district 1 only uses dominant frequency, and the base station do not notify this user terminal by broadcast channel, then this user terminal need the dominant frequency in sub-district 1 be subband 4, secondary be to send measurement pilot frequency on the subband 1,2,3 frequently.
Secondary and the base station is by the broadcast channel informing user terminal frequently if user terminal only uses, and then user terminal only sends measurement pilot frequency in this pair frequently.As shown in Figure 9, secondary and the base station notifies this user terminal by broadcast channel frequently if certain user terminal of sub-district 1 only uses, and then only to need in pair be to send measurement pilot frequency on the subband 1,2,3 to this user terminal frequently.
Secondary and the base station is by the broadcast channel informing user terminal frequently if user terminal only uses, then user terminal need at its affiliated subdistrict dominant frequency, secondaryly send measurement pilot frequency on frequently.As shown in Figure 9, secondary and the base station do not notify this user terminal by broadcast channel frequently if certain user terminal of sub-district 1 only uses, then this user terminal need the dominant frequency in sub-district 1 be subband 4, secondary be to send measurement pilot frequency on the subband 1,2,3 frequently.
If user terminal had both used dominant frequency, has also used pair frequently, no matter whether the base station is by the broadcast channel informing user terminal so, no matter promptly whether user terminal knows this operating position, user terminal all needs to send measurement pilot frequency on the dominant frequency at its affiliated subdistrict, the secondary frequency.As shown in Figure 9, if certain user terminal of sub-district 1 uses dominant frequency, frequently secondary simultaneously, no matter then whether the base station is by the broadcast channel informing user terminal, it is that subband 4, pair are to send measurement pilot frequency on the subband 1,2,3 frequently that this user terminal needs the dominant frequency in sub-district 1.
The invention still further relates to a kind of measurement pilot frequency transmitting system, as shown in figure 10, structured flowchart for the preferable a kind of measurement pilot frequency transmitting system of the present invention, this system mainly comprises base station and user terminal, this base station comprises that further subcarrier division module, major-minor frequency division are joined module, transmitting power is provided with module, frequency band use information broadcast module, frequency band use determination module, sending module, user terminal comprises that further receiver module, frequency band use information-generation module, measurement pilot frequency sending module, and wherein the base station can not comprise that also frequency band uses the information broadcast module.
Subcarrier is divided module M the subcarrier that system is all and is divided into N group subband, and N is the positive integer greater than 1, and M is the positive integer greater than 1, and M is 4 multiple in this better embodiment, i.e. N=M/4, and subcarrier division module will be divided the result and be passed to sending module.
Subcarrier is divided module M subcarrier is divided into the relation of N group subband, and the relation that reaches N=M/4 can immobilize, and also can carry out dynamic change according to the time, but the i.e. grouping random variation of subcarrier.
The major-minor frequency division is joined module divides module according to subcarrier division result and is each cell allocation dominant frequency and frequently secondary according to certain rule.It generally is to take 1/3 frequency band according to dominant frequency that the major-minor frequency division is joined module, secondary 2/3 the rule of frequently taking is each cell allocation dominant frequency and frequently secondary, but can adjust in the reality, as adjusting according to business demand, the major-minor allocation of subbands is passed to sending module with allocation result.
The major-minor frequency division is joined module can be the base station controller of system, it is that different neighbor cells is selected the dominant frequency of above-mentioned different subband as this sub-district that the major-minor frequency division is joined module, other subband is frequently secondary as this sub-district, also can be that the cell selecting dominant frequency is with frequently secondary according to the method for partial frequency multiplexing, dominant frequency is mainly used in the communication of Cell Edge User terminal, the secondary communication that is mainly used in sub-district internal user terminal frequently.
Transmitting power is provided with module the dominant frequency of each sub-district is provided with different transmitting power thresholdings frequently with secondary, and the transmitting power thresholding of dominant frequency is higher than secondary transmitting power thresholding frequently, coverage with dominant frequency is determined cell boarder, and transmitting power is provided with module and the result will be set pass to sending module.
Like this, for inside, sub-district, the main low-power pair that adopts keeps pouring in defeated user terminal data, because closer from the base station, terminal can receive this sub-district signal clearly, and because secondary frequency power is little, interference ratio to neighbor cell is less, i.e. the terminal of inside, sub-district is because each base station is by the restriction to transmitting power, can not be subjected to the interference of adjacent base station signal, perhaps disturb very little; And at each neighbor cell fringe region, adopt high power dominant frequency transmission user terminal data, what be in that the terminal of fringe region mainly receives is the dominant frequency of its affiliated subdistrict, because the dominant frequency non-overlapping of different neighbor cells is not in on the frequency, be in quadrature, so the phase mutual interference will reduce greatly.Transmitting power is provided with module can also dynamically adjust dominant frequency and secondary frequently set transmitting power thresholding.
In addition, the division that subcarrier is divided subband and dominant frequency and secondary frequency can immobilize, also can carry out dynamic change according to the time, but the division random variation of i.e. grouping of subcarrier and dominant frequency and secondary frequency, as long as neighbor cell does not use same subband simultaneously in guaranteeing at one time.
When user terminal need transmit data, user terminal was to base station feedback current C QI information, and frequency band uses the CQI information of determination module according to active user's terminal, determined that whether this user terminal only uses dominant frequency, only uses secondary frequency, perhaps uses major-minor frequently simultaneously.
In addition, frequency band uses determination module whether user terminal only can also be used dominant frequency, only use pair frequently, perhaps still use major-minor frequency band frequently to use information further to pass to frequency band simultaneously and use the information broadcast module, use the information of subband and pass to sending module about user terminal by the generation of frequency band use information broadcast module is corresponding; Frequency band uses determination module also can directly whether user terminal only be used dominant frequency, only use pair frequently, perhaps still use major-minor information frequently to pass to sending module simultaneously, then by sending module the information of described user terminal service band is passed through the broadcast channel informing user terminal at last, also can pass through other channel notification user terminal, also informing user terminal not.
Whether the frequency band use information-generation module of user terminal is only used dominant frequency, a use is frequently secondary or is used the situation of major-minor frequency to produce frequency band use information respectively and pass to the measurement pilot frequency sending module simultaneously according to user terminal.
If whether the sending module of base station has only used described user terminal dominant frequency, only uses frequently secondary or used major-minor information frequently by the broadcast channel informing user terminal simultaneously, then the receiver module of relative users terminal also needs this information is passed to the measurement pilot frequency sending module after receiving this information.
Whether the measurement pilot frequency sending module only uses dominant frequency, only uses frequently secondary or uses major-minor frequency band frequently to use information simultaneously according to user terminal, and according to this operating position that whether receives sending module broadcasting, send measurement pilot frequency respectively, specific as follows described.
If user terminal only uses dominant frequency, and the sending module of base station by broadcast channel with this operating position informing user terminal, then the frequency band of user terminal uses information-generation module generation user terminal only to use dominant frequency information and pass to the measurement pilot frequency sending module, and the user terminal that receiver module receives described broadcasting only uses dominant frequency information and passes to the measurement pilot frequency sending module, and the measurement pilot frequency sending module sends measurement pilot frequency according to these two kinds of information on this dominant frequency.
If user terminal only uses dominant frequency, and the sending module of base station not by broadcast channel with this operating position informing user terminal, then the frequency band of user terminal uses information-generation module generation user terminal only to use dominant frequency information and pass to the measurement pilot frequency sending module, and the measurement pilot frequency sending module sends measurement pilot frequency according to this information on the dominant frequency of this user terminal affiliated subdistrict, secondary frequency.
If user terminal only uses frequently secondary, and the sending module of base station by broadcast channel with this operating position informing user terminal, then the frequency band of user terminal uses information-generation module generation user terminal only to use secondary information frequently and passes to the measurement pilot frequency sending module, and the user terminal that receiver module receives described broadcasting only uses secondary information frequently and passes to the measurement pilot frequency sending module, and the measurement pilot frequency sending module sends measurement pilot frequency in this pair frequently according to these two kinds of information.
If user terminal only uses frequently secondary, and the sending module of base station not by broadcast channel with this operating position informing user terminal, then frequency band uses information-generation module generation user terminal only to use secondary information frequently and passes to the measurement pilot frequency sending module, and the measurement pilot frequency sending module sends measurement pilot frequency in dominant frequency, the pair of this user terminal affiliated subdistrict frequently according to this information.
If user terminal had both used dominant frequency, also use frequently secondary, then frequency band uses information-generation module generation user terminal all to use dominant frequency and secondary information frequently and passes to the measurement pilot frequency sending module, though so the sending module of base station whether by broadcast channel with this operating position informing user terminal, the measurement pilot frequency sending module all need at this user terminal affiliated subdistrict dominant frequency, secondaryly send measurement pilot frequency on frequently.
In sum, by the better embodiment of the invention described above as can be known, a kind of method and user terminal thereof that sends measurement pilot frequency of the present invention, system, because whether user terminal can only take dominant frequency according to current its, or only take frequently secondary, or take major-minor simultaneously frequently, with and whether know that this frequency band use information comes to send respectively targetedly at least respectively the out-hole run pilot tone on the employed frequency band of user terminal, therefore, measurement pilot frequency transmission technology of the present invention can further reduce the amount of information that measurement pilot frequency transmission information takies, and effectively reduces the expense of measurement pilot frequency resource.
But above-mentioned only is better embodiment of the present invention; be not to be used to limit protection scope of the present invention; any those skilled in the art of being familiar with will be appreciated that; all within the spirit and principles in the present invention scope; any modification of being done, equivalence replacement, improvement etc. all should be included within the scope of the present invention.
Claims (21)
1. a method that sends measurement pilot frequency is characterized in that, comprising:
Steps A in frequency reuse system, is used for the dominant frequency and the secondary frequency of cell communication for each cell allocation;
Step B determines that user terminal uses dominant frequency, secondary operating position frequently;
Step C, user terminal uses dominant frequency, secondary situation frequently to send measurement pilot frequency at least on its employed frequency band according to it.
2. a kind of method that sends measurement pilot frequency as claimed in claim 1 is characterized in that: step B further comprises the use of determining user terminal use dominant frequency, secondary frequency according to the current CQI information of user terminal.
3. a kind of method that sends measurement pilot frequency as claimed in claim 1, it is characterized in that: dominant frequency is used for the communication of cell boundary users terminal, the secondary communication that is used for sub-district internal user terminal frequently, and the transmitting power thresholding of dominant frequency is greater than pair transmitting power thresholding frequently.
4. as claim 1,2 or 3 each described a kind of methods that send measurement pilot frequency, it is characterized in that: among the step B, only use one of dominant frequency, secondary frequency if determine user terminal, and user terminal is not known the information that it uses major and minor frequency, and then user terminal sends measurement pilot frequency on the dominant frequency of its affiliated subdistrict, secondary frequency.
5. as claim 1,2,3 each described a kind of methods that send measurement pilot frequency, it is characterized in that:
Step B further comprises the information of user terminal service band by the broadcast channel informing user terminal.
6. a kind of method that sends measurement pilot frequency as claimed in claim 5 is characterized in that: among the step B, only use one of dominant frequency, secondary frequency if determine user terminal, then user terminal sends measurement pilot frequency on its corresponding employed frequency band.
7. as claim 1,2,3 each described a kind of methods that send measurement pilot frequency, it is characterized in that:
Among the step B, use dominant frequency, frequently secondary simultaneously if determine user terminal, then user terminal sends measurement pilot frequency on the dominant frequency of its affiliated subdistrict, secondary frequency.
8. a kind of method that sends measurement pilot frequency as claimed in claim 1 is characterized in that, and: step B further comprises whole frequency band is divided into some subbands.
9. measurement pilot frequency transmitting system, this system is a frequency reuse system, mainly comprise base station and user terminal, this base station comprises that further the major-minor frequency division joins module, the major-minor frequency division is joined module is used for cell communication for each cell allocation dominant frequency and secondary frequency, then base station and user terminal communicate according to the frequency band of above-mentioned distribution, it is characterized in that, the base station comprises that also being used for definite user terminal uses dominant frequency, secondary frequency band frequently uses determination module, user terminal comprises that also frequency band uses information-generation module and measurement pilot frequency sending module, frequency band uses information-generation module to use the affirmation information of determination module to produce frequency band according to described frequency band and uses information and pass to the measurement pilot frequency sending module, and the measurement pilot frequency sending module uses information to send measurement pilot frequency at least on the employed frequency band of user terminal according to this frequency band.
10. a kind of measurement pilot frequency transmitting system as claimed in claim 9 is characterized in that the base station also comprises a sending module, and sending module is by the frequency band use information informing user terminal of broadcast channel with the user terminal service band.
11. a kind of measurement pilot frequency transmitting system as claim 9 is stated is characterized in that, frequency band uses determination module to determine that according to the current CQI information of user terminal user terminal uses dominant frequency, secondary operating position frequently.
12. a kind of measurement pilot frequency transmitting system as claimed in claim 9, it is characterized in that: dominant frequency is used for the communication of cell boundary users terminal, the secondary communication that is used for sub-district internal user terminal frequently, base station comprise that also a transmitting power is provided with module and the transmitting power thresholding of dominant frequency is set greater than pair transmitting power thresholding frequently.
13. as claim 9,11 or 12 each described a kind of measurement pilot frequency transmitting systems, it is characterized in that: frequency band uses determination module to determine that user terminal only uses one of dominant frequency, secondary frequency, and user terminal is not known the information of its service band, and then the measurement pilot frequency sending module of user terminal sends measurement pilot frequency on the dominant frequency of user terminal affiliated subdistrict, secondary frequency.
14. a kind of measurement pilot frequency transmitting system as claimed in claim 10, it is characterized in that: frequency band uses determination module to determine that user terminal only uses one of dominant frequency, secondary frequency, and then the measurement pilot frequency sending module of user terminal sends measurement pilot frequency on the employed frequency band of user terminal.
15. as claim 9,10,11 or 12 each described a kind of measurement pilot frequency transmitting systems, it is characterized in that: frequency band uses determination module to determine that user terminal uses dominant frequency, frequently secondary simultaneously, and then the measurement pilot frequency sending module of user terminal sends measurement pilot frequency on the dominant frequency of user terminal affiliated subdistrict, secondary frequency.
16. a kind of measurement pilot frequency transmitting system as claimed in claim 9, it is characterized in that, the base station further comprises subcarrier division module, and subcarrier division Module Division whole frequency band is several subbands, and the major-minor frequency division is joined module and is each cell allocation dominant frequency and pair frequency according to dividing the result.
17. user terminal, this user terminal is used for communicating with the base station, it is characterized in that, this user terminal comprises that frequency band uses information-generation module and measurement pilot frequency sending module, frequency band uses information-generation module to use dominant frequency, secondary behaviour in service frequently to produce frequency band and use information and pass to the measurement pilot frequency sending module according to this user terminal, and the measurement pilot frequency sending module uses information to send measurement pilot frequency at least on the employed frequency band of user terminal according to this frequency band.
18. a kind of user terminal as claimed in claim 17, it is characterized in that: user terminal only uses one of dominant frequency, secondary frequency, and user terminal is not known the information of its service band, and then the measurement pilot frequency sending module sends measurement pilot frequency on the dominant frequency of user terminal affiliated subdistrict, secondary frequency.
19. a kind of user terminal as claimed in claim 17 is characterized in that: user terminal also comprises a receiver module, receiver module uses information and passes to the measurement pilot frequency sending module by the broadcast channel frequency acceptance band.
20. a kind of user terminal as claimed in claim 19 is characterized in that: user terminal only uses one of dominant frequency, secondary frequency, and then the measurement pilot frequency sending module only sends measurement pilot frequency on the employed frequency band of user terminal.
21. as claim 17 or 19 described a kind of user terminals, it is characterized in that: user terminal uses dominant frequency, frequently secondary simultaneously, and then the measurement pilot frequency sending module sends measurement pilot frequency on the dominant frequency of user terminal affiliated subdistrict, secondary frequency.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006100605620A CN101064701B (en) | 2006-04-26 | 2006-04-26 | Method for transmitting measurement pilot and its user terminal, system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006100605620A CN101064701B (en) | 2006-04-26 | 2006-04-26 | Method for transmitting measurement pilot and its user terminal, system |
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| CN101064701A true CN101064701A (en) | 2007-10-31 |
| CN101064701B CN101064701B (en) | 2011-07-20 |
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| CN2006100605620A Expired - Fee Related CN101064701B (en) | 2006-04-26 | 2006-04-26 | Method for transmitting measurement pilot and its user terminal, system |
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| WO2008134981A1 (en) * | 2007-04-30 | 2008-11-13 | Da Tang Mobile Communications Equipment Co., Ltd. | Method, system, base station and terminal for transmitting uplink channel sounding pilot |
| WO2009100630A1 (en) * | 2008-02-01 | 2009-08-20 | Zte Corporation | Mapping method and device for initial location of downlink pilot |
| CN101800570A (en) * | 2009-02-05 | 2010-08-11 | 中兴通讯股份有限公司 | Method for obtaining channel quality indication (CQI) information |
| CN101882943A (en) * | 2009-05-08 | 2010-11-10 | 中兴通讯股份有限公司 | Method for sending downlink measuring pilot frequencies |
| CN102064863A (en) * | 2009-11-16 | 2011-05-18 | 瑞昱半导体股份有限公司 | Transmit diversity method applied to transmission system and transmission system of multiple transmission paths |
| WO2011097939A1 (en) * | 2010-02-12 | 2011-08-18 | 中兴通讯股份有限公司 | Method and base station for transmitting channel measurement pilots |
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| WO2019007255A1 (en) * | 2017-07-03 | 2019-01-10 | 中兴通讯股份有限公司 | Wireless communication method, base station and user equipment |
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| EP1178641B1 (en) * | 2000-08-01 | 2007-07-25 | Sony Deutschland GmbH | Frequency reuse scheme for OFDM systems |
| KR20050049140A (en) * | 2003-11-21 | 2005-05-25 | 삼성전자주식회사 | Method for embodying uplink fram of wireless communication system based on ofdma |
| CN1719817A (en) * | 2004-07-09 | 2006-01-11 | 北京三星通信技术研究有限公司 | The pilot transmission of orthogonal FDM communication system and method for reseptance |
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| CN101882943B (en) * | 2009-05-08 | 2015-10-21 | 中兴通讯股份有限公司 | The sending method of downlink measurement pilot frequency |
| US8897392B2 (en) | 2009-11-13 | 2014-11-25 | Realtek Semiconductor Corp. | Transmit diversity method applied to a transmitting system and transmitting system having multi-transmission paths thereof |
| CN102064863A (en) * | 2009-11-16 | 2011-05-18 | 瑞昱半导体股份有限公司 | Transmit diversity method applied to transmission system and transmission system of multiple transmission paths |
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