CN1909440B - Communication method for broad band time-division duplex system - Google Patents
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Abstract
The invention relates to a communication method for wideband time-division duplex system, wherein said system, based on the stat signal channel condition, sets correlation and relative bandwidth; and the communication method comprises: 1, based on the available resource condition of system, distributes sub band or sub carrier wave for the ascending and descending directions of data transmission of same user; 2, based on the signal channel condition at the ascending/descending direction, in relative bandwidth, obtaining the signal channel condition of sub band or sub carrier wave at the descending/ascending direction of data transmission of said user; 3, at the descending/ascending direction, using obtained signal channel condition to transmit data. The inventive communication method can flexibly distribute frequency domain, and confirm the symmetry of signal channel of ascending and descending transmission of time-division duplex system.
Description
Technical field
The present invention relates to a kind of wireless communications method, particularly relate to a kind of communication means of wideband time division duplexing system.
Background technology
For traditional time division duplex (TDD) system, it is advantageous that the user uses identical carrier wave timesharing ground to carry out the transmission of up-downgoing, like this when time interval of uplink and downlink transfer during less than the correlation bandwidth of channel, basically can think that uplink is identical with the channel that downlink transfer is experienced, just, can think that the channel conditions of uplink and downlink transfer is identical, thereby can utilize the channel estimation value of one of them direction, the transmission of other direction is carried out the preliminary treatment of transmitting terminal, such as wave beam forming, power control, adaptive modulation and coding etc.
And concerning wideband time division duplexing system, generally need to adopt multi-transceiver technology, comprise traditional multicarrier (MCM) technology and OFDM (OFDM) multi-transceiver technology, thereby make scheduling of resource not only can carry out, also can carry out at frequency domain in time domain.
Wherein, the MCM technology is meant and has a plurality of real carrier waves in system, and the big and intercarrier of the bandwidth of each carrier wave need be reserved bigger protection at interval, and different users can be respectively in the enterprising line data transmission of different carrier waves; And the OFDM technology is meant real carrier wave of existence in system, and be divided into a lot of virtual subcarriers, the bandwidth of each subcarrier is less, allows certain crossover between a plurality of subcarriers, and different users can be respectively in the enterprising line data transmission of different carrier waves.
Because the MCM multi-transceiver technology is lower on the availability of frequency spectrum at present, generally all adopt multi-transceiver technology, such as OFDM, DFT-S-OFDM based on OFDM, IFDMA technology etc., for convenience, in narration process of the present invention, will be referred to as multi-transceiver technology based on the multi-transceiver technology of OFDM.Because such multi-transceiver technology, following characteristic is all arranged: promptly its frequency domain direction all can be divided into a lot of subcarriers, the user both can use the subband that is made of a plurality of adjacent subcarriers to carry out transfer of data, also can use a plurality of non-conterminous subcarriers to carry out transfer of data.As shown in Figure 1, the subband that user 1 uses a plurality of adjacent subcarriers to constitute carries out transfer of data, and user 2 uses a plurality of non-conterminous subcarriers to carry out transfer of data, and wherein, user's 2 employed subcarriers in addition oblique line are represented.
Owing to increased the resource division on the frequency domain, thereby what make that down channel and its up channel of same user use probably is that different subband or subcarriers transmits.If subband or subcarrier a good distance off that same user's uplink and downlink transfer are used, during considerably beyond the correlation bandwidth of channel, basically can think that then this user uplink transmission is incoherent with the employed channel of downlink transfer, thereby can't utilize the symmetry of tdd systems up-downgoing channel.
As everyone knows, correlation bandwidth B
cRoot mean square σ with the expansion of the time delay of channel
τRelevant with the definition correlation bandwidth time correlation function value that uses.If correlation bandwidth is defined as frequency dependence greater than certain specific bandwidth of 0.9, then correlation bandwidth is approximately:
If with definition relax to correlation greater than 0.5, then correlation bandwidth is approximately:
If as seen employed correlation is more little in the definition, then correlation bandwidth is big more; That is to say that correlation bandwidth is undefined in certain correlation, when overlapping two subbands or subcarrier when the big bandwidth of being separated by progressively changes, correlation between two subbands or the subcarrier is progressively from large to small.When the bandwidth of being separated by when two subbands is one or several correlation bandwidths, not incoherent fully between two subbands or the subcarrier, employed correlation when just its correlation is less than definition correlation bandwidth.This just provides possibility for the TDD system utilizes employed not far subband or the near symmetrical between the subcarrier of being separated by of upstream and downstream channel.
Simultaneously, find out that the definition of correlation bandwidth is relevant with the correlation between respective sub-bands from above-mentioned formula.The value of correlation bandwidth is by the time delay expansion root mean square σ of channel
τDetermine.Time delay expansion root mean square σ under the varying environment
τDifference, the time delay expansion root-mean-square value under the varying environment that space channel model (SCM) provides is as shown in table 1:
Table 1
| Channel circumstance | The suburb, macrocell | The urban district, macrocell | The urban district, Microcell |
| Time delay expansion root mean square | 0.17μs | 0.65μs | 0.251μs |
As can be seen from Table 1, when using identical correlation to carry out the correlation bandwidth definition, under different channel circumstances, correlation bandwidth also can be different, can differ about 4 times at most.Under the urban macro cell environment, the correlation bandwidth minimum, the correlation bandwidth of suburb macrocell and urban district Microcell is then bigger.This is similarly tdd systems and utilizes the employed near symmetrical of being separated by between the not far subband of upstream and downstream channel that possibility is provided.
Table 2 has provided under the different channels environment, and correlation is 0.9 and 0.5 correlation bandwidth:
Table 2
| Channel circumstance | The suburb, macrocell | The urban district, macrocell | The urban district, Microcell |
| Time delay expansion root mean square | 0.17μs | 0.65μs | 0.251μs |
| Correlation bandwidth (correlation 0.9) | 118kHz | 31kHz | 80kHz |
| Correlation bandwidth (correlation 0.5) | 1180kHz | 310kHz | 800kHz |
For tdd systems, existing mature system all is to use identical carrier wave timesharing ground to carry out up and downlink transfer.As long as guarantee to have the short time interval between uplink and the downlink transfer, can be in order to symmetry with tdd systems up-downgoing interchannel.
And for the wideband time division duplexing system that has used multi-transceiver technology, a kind of consideration that rests on theoretical research stage is to allow the up-downgoing channel use identical subband or subcarrier to transmit, thereby utilizes the symmetry of up-downgoing interchannel.But such consideration is what be difficult to realize when real system moves, this be because:
1) at first, can carry out the division of resource on the frequency domain, the system that makes has more the flexibility that resource is used, and can utilize the spectrum efficiency that improves system based on the scheduling of frequency domain.But if the up-downgoing channel uses identical subband or subcarrier to transmit, this has reduced flexibility undoubtedly.Just, when satisfying the up-downgoing channel and use same sub-band or subcarrier, the performance of the scheduling of resource of carrying out based on frequency domain is with big heavy discount.
2) secondly, in order to support asymmetric business, up is different with the data volume of downlink transfer.At this moment, almost can not allow upstream and downstream channel use identical subband or subcarrier to transmit,, thereby cause the waste of overall spectral efficiency unless the little direction (up or descending) of data volume is transmitted too much redundancy.
At present, can not solve the communication means appearance of the channel symmetry characteristic that in wideband time division duplexing system, utilizes time division duplex well.
Summary of the invention
For this reason, the present invention proposes a kind of communication means that can make full use of the channel symmetry characteristic of time division duplex in wideband time division duplexing system.
The communication means of wideband time division duplexing system of the present invention, wherein, this wideband time division duplexing system is set correlation and corresponding correlation bandwidth thereof according to the channel circumstance of statistics, and this communication means may further comprise the steps:
Step 1:, be up direction and the down direction allocated subbands or the subcarrier of same user's data transmission according to the situation of the available resources of system;
Step 2: according to this user on the up/down direction of transfer of data subband or the channel conditions of subcarrier, in the correlation bandwidth scope, obtain this user on the descending/up direction of transfer of data subband or the channel conditions of subcarrier; And
Step 3: above-mentioned descending/up direction on, the channel conditions that utilize to obtain carries out transfer of data.
Wherein, this correlation bandwidth also can rule of thumb be worth and sets.
In step 1, can distribute identical subband or subcarrier with down direction for the up direction of this user's data transmission.At this moment, in step 2, directly use above-mentioned up/subband on the down direction or the channel conditions of subcarrier, as the channel conditions of subband on descending/up direction or subcarrier.
In addition, in step 1, also can distribute be separated by subband or minimum subband or the subcarrier of number of subcarriers for the up direction and the down direction of this user's data transmission.At this moment, in step 2, directly use above-mentioned up/subband on the down direction or subcarrier in descending/up direction on subband or subcarrier the be separated by minimum subband of number of subcarriers or the channel conditions of subcarrier, as the channel conditions of subband on descending/up direction or subcarrier.
Further, in step 1, above-mentioned descending/subband on the up direction or subcarrier and above-mentioned up/subband on the down direction or subcarrier are not overlapping or overlap.At this moment, in step 2, can by above-mentioned up/down direction on, utilize the method for interpolation, obtain the subband on descending/up direction or the channel conditions of subcarrier.
When the frequency band range of subband on up/down direction or subcarrier was positioned at the same side of frequency band range of subband on descending/up direction or subcarrier, the method for above-mentioned interpolation was to extrapolated value.
When the frequency band range of subband on up/down direction or subcarrier laid respectively at the both sides of frequency band range of subband on descending/up direction or subcarrier, the method for above-mentioned interpolation was to interpolate value.
In addition, in step 2, can also be: for above-mentioned up/subband on the down direction or subcarrier in descending/up direction on subband or subcarrier be separated by number of subcarriers less subband or subcarrier, directly use its channel conditions as the less subband of the number of carriers of being separated by with it on descending/up direction or the channel conditions of subcarrier, simultaneously, for above-mentioned descending/other subbands on the up direction or the channel conditions of subcarrier, by above-mentioned up/down direction on, utilize the method for interpolation to obtain.
Compared with prior art, communication means of the present invention by in the associated frequency band scope, utilizes the method for directly use or interpolation, and subband from the transmission direction or subcarrier obtain the subband in another transmission direction or the channel conditions of subcarrier.This communication means when guaranteeing to carry out frequency domain dispatching neatly, the assurance of maximum likelihood the up-downgoing channel transmitted symmetry of tdd systems.
Description of drawings
Fig. 1 is that the user utilizes the subband of adjacent sub-carrier composition or the schematic diagram that a plurality of non-conterminous subcarrier carries out transfer of data.
Fig. 2 be on/when downlink transfer is subband, use the schematic diagram of a kind of situation of communication means of the present invention.
Fig. 3 be on/when downlink transfer is subband, use the schematic diagram of the another kind of situation of communication means of the present invention.
Fig. 4 is that uplink is a subcarrier, when downlink transfer is subband, uses the schematic diagram of a kind of situation of communication means of the present invention.
Fig. 5 is that uplink is a subcarrier, when downlink transfer is subband, uses the schematic diagram of the another kind of situation of communication means of the present invention.
Fig. 6 is that uplink is a subcarrier, when downlink transfer is subband, uses the schematic diagram of another situation of communication means of the present invention.
Embodiment
Below with reference to accompanying drawing the communication means that the present invention is used for wideband time division duplexing system is described in detail.
For the wideband time division duplexing system that has used multi-transceiver technology, its real carrier wave that exists in traditional tdd systems is divided into a lot of virtual subcarriers, the bandwidth of each subcarrier is less, allow certain crossover between a plurality of subcarriers, thereby allow different users to transmit at the enterprising line data of different carrier waves respectively.
In order to be implemented in the channel symmetry of farthest utilizing the up-downgoing of time division duplex in the wideband time division duplexing system, the invention discloses a kind of means of communication in above-mentioned wideband time division duplexing system.Below will specifically describe the realization of this communication means under different situations.
Distributing transmission time and transmission during subcarrier for the user, wideband time division duplexing system is when being thought of as the user and distributing optimum transmission time and transmission subcarrier, and the uplink for the user distributes identical subcarrier with downlink transfer as far as possible.Wherein, optimum transmission time and transmission subcarrier are meant the user when such transmission time and transmission subcarrier transmitting data, and system can obtain high reliability and/or spectrum efficiency.
In the time can not distributing identical subcarrier, also need as far as possible to be this user's uplink and the downlink transfer distribution minimum subcarrier of number of sub carrier wave of being separated by for some users.Concrete, when using one or more subband to carry out transfer of data in some transmission directions, be separated by the minimum available frequency resources of number of sub carrier wave when being subband with this subband in the another one transmission direction, with reference to following situation (1); If when using one or more subband to carry out transfer of data in some transmission directions, be separated by the minimum available frequency resources of number of sub carrier wave when being a plurality of non-conterminous subcarrier with this subband in the another one transmission direction, with reference to following situation (2).
For convenience of description, above-mentioned " a certain transmission direction " is assumed to be the uplink direction here, with the downlink transmission direction that is set to of above-mentioned " another transmission direction " correspondence.Conversely, also above-mentioned " a certain transmission direction " can be assumed to be downlink transmission direction, with above-mentioned " another transmission direction " corresponding be set to the uplink direction.Here be that example describes with the former, but be not limited thereto.
(1) when uplink and downlink transfer all use subband to transmit, can use be separated by the characteristic of channel on the nearest subband of uplink direction up and down row transmission direction upper frequency, directly replace the characteristic of channel of all subbands on the downlink transmission direction; Perhaps, in the characteristic of channel of using on the uplink direction on the method acquisition downlink transmission direction of interpolation.Be without loss of generality, characteristic of channel when hypothesis need obtain downlink transfer by uplink here, uplink can be used 1 or 2 subbands, and downlink transfer is used 1 subband, and when uplink and downlink transfer used a plurality of subbands to transmit more generally speaking, each subband all can be reduced to following two kinds of situations:
A) first kind of situation is, uplink distributes 1 subband, and different with the descending subband that distributes.As shown in Figure 2, the subband that uplink distributes is A, and the subband that downlink transfer is distributed is B.In order to make full use of the up-downgoing channel symmetry, at this moment, the characteristic of channel that can consider to utilize the subband A that uplink distributes is by obtaining the characteristic of channel of the subband C of uplink to the method for extrapolated value, this subband C is corresponding with the frequency range of the subband B of downlink transfer distribution.Therefore, according to the channel symmetry characteristic of tdd systems, the characteristic of channel of subband C can be equivalent to the characteristic of channel of the subband B of downlink transfer distribution.Though here just with subband B as an example, yet be understandable that, by above-mentioned to extrapolated value, can be simply and easily obtain the characteristic of channel of all subbands of downlink transfer.
B) second kind of situation is, uplink distributes 2 subbands, and its frequency range lays respectively at the both sides of the subband that downlink transfer distributes.As shown in Figure 3,2 subbands that uplink distributed are respectively subband A and D, and the subband that downlink transfer is distributed is B.At this moment, can consider to utilize the subband A of uplink distribution and the characteristic of channel on the D, by obtain the characteristic of channel of the subband C of uplink to the method for interpolate value, this subband C is corresponding with the frequency range of the subband B that downlink transfer is distributed.Therefore, according to the channel symmetry characteristic of tdd systems, the characteristic of channel of subband C can be equivalent to the characteristic of channel of the subband B of downlink transfer distribution.Though here just with subband B as an example, yet be understandable that, by above-mentioned to interpolate value, can be simply and easily obtain the characteristic of channel of all subbands of downlink transfer.
(2) be without loss of generality, suppose that here downlink transfer uses one or more subband to carry out the transmission of data, and uplink use a plurality of non-conterminous subcarriers to transmit.At this moment, can use and be separated by the characteristic of channel on the subcarrier of the minimum uplink of number of sub carrier wave of the employed subband of downlink transfer, directly replace the characteristic of channel of employed subband on the downlink transfer; Perhaps use the method for interpolation to obtain the characteristic of channel on the downlink transfer.Be without loss of generality, suppose that here downlink transfer uses a son to bring the line data transmission into, and more generally speaking, when downlink transfer used a plurality of subbands to transmit, each subband all can be reduced to following three kinds of situations:
A) first kind of situation, the frequency band range of the subband that the frequency band range of the subcarrier that uplink distributes and downlink transfer are distributed has overlapping part.As shown in Figure 4, suppose that the subcarrier that uplink distributes is respectively f
1... f
6(be example just here, be not limited thereto) with 6, the subband of downlink transfer is E, the subband E of the subcarrier of uplink and downlink transfer has overlapping part.The characteristic of channel of lap among the subband E of downlink transfer can be utilized the subcarrier f of the lap in the uplink subcarrier
1, f
2, f
3The characteristic of channel by interpolation or directly obtain.And underlapped local channel characteristic, when the subcarrier of underlapped part is positioned at the side of subband E of downlink transfer, can be by obtaining with the similar method of following situation (b), and when the subcarrier of underlapped part lays respectively at the both sides of subband E of downlink transfer, can by with following situation (c) similarly method obtain.
B) second kind of situation, the frequency band range of the subcarrier that uplink distributes does not have overlapping part with the frequency band range of the subband that downlink transfer is distributed, and the frequency band range of the subcarrier that distributes of uplink is positioned at the side of frequency band range of the subband of downlink transfer distribution.As shown in Figure 5, the subcarrier of uplink distribution is f
1... f
6Frequency band range be positioned at a side of the frequency band range of the subband E that downlink transfer distributes.At this moment, can consider that the subcarrier that utilizes uplink to distribute is f
1... f
6The characteristic of channel by obtain the characteristic of channel of the subband F of uplink to the method for extrapolated value, this subband F is corresponding with the frequency range of the subband E of downlink transfer distribution.Therefore, according to the channel symmetry characteristic of tdd systems, the characteristic of channel of subband F can be equivalent to the characteristic of channel of the subband E of downlink transfer distribution.Though here just with subband E as an example, yet be understandable that, by above-mentioned to extrapolated value, can be simply and easily obtain the characteristic of channel of all subbands of downlink transfer.
C) the third situation, the frequency band range of the subcarrier that uplink distributes does not have overlapping part with the frequency band range of the subband that downlink transfer is distributed, and the frequency band range of the subcarrier that distributes of uplink lays respectively at the both sides of frequency band range of the subband of downlink transfer distribution.As shown in Figure 6, the subcarrier of uplink distribution is f
1... f
6Lay respectively at the both sides of the frequency band range of the subband E that downlink transfer distributes, just, subcarrier f
1-f
3Frequency band range be positioned at a side of the frequency band range of subband E, and the frequency band range of subcarrier f4-f6 is positioned at the opposite side of the frequency band range of subband E.Fig. 6 only is an exemplary diagram, is not limited to the situation of this symmetry for the quantity of the subcarrier of the both sides of the frequency band range that is positioned at subband E, and it also can be asymmetric quantity, and this need decide according to the distribution of the uplink reality of system.At this moment, can consider that the subcarrier that utilizes uplink to distribute is f
1... f
6The characteristic of channel by obtain the characteristic of channel of the subband F of uplink to the method for interpolate value, this subband F is corresponding with the frequency range of the subband E of downlink transfer distribution.Therefore, according to the channel symmetry characteristic of tdd systems, the characteristic of channel of subband F can be equivalent to the characteristic of channel of the subband E of downlink transfer distribution.Though here just with subband E as an example, yet be understandable that, by above-mentioned to interpolate value, can be simply and easily obtain the characteristic of channel of all subbands of downlink transfer.
Certainly, according to above description, in communication means of the present invention, also can be: for above-mentioned up/subband on the down direction or subcarrier in descending/up direction on subband or subcarrier be separated by number of subcarriers less subband or subcarrier, directly use its channel conditions as the less subband of the number of carriers of being separated by with it on descending/up direction or the channel conditions of subcarrier, simultaneously, for above-mentioned descending/other subbands on the up direction or the channel conditions of subcarrier, by above-mentioned up/down direction on, inwardly utilize or obtain to the method for extrapolated value.
By to the analysis in the above-mentioned different situations, can be clear that, communication means of the present invention has utilized the symmetry characteristic of tdd systems up-downgoing channel fully, by the method for interpolation, obtains the characteristic of channel in another transmission direction from the characteristic of channel of a transmission direction.By communication means of the present invention, can be when carrying out flexibly frequency domain dispatching, maximum likelihood ground guarantees the up-downgoing channel transmitted symmetry of tdd systems.
Below in conjunction with a concrete example application of this method in real system is described.
For the ofdm system of a time division duplex, its subcarrier spacing is 15kHz, and a subband is made of 13 subcarriers, and the width of a subband is 195kHz so.Description according to the background technology part can draw under the varying environment, and the number of sub-bands that comprises in the correlation bandwidth is as shown in table 3:
Table 3
| Channel circumstance | The suburb, macrocell | The urban district, macrocell | The urban district, Microcell |
| The number of sub-bands that comprises in the correlation bandwidth (correlation 0.9) | ≈1 | ＜1 | ＜1 |
| The number of sub-bands that comprises in the correlation bandwidth (correlation 0.5) | ≈6 | ＜2 | ≈4 |
Can find from table 3, be 0.9 o'clock in correlation, only comprise a subband in the correlation bandwidth, and correlation is, can comprise 6 subbands in the correlation bandwidth at most at 0.5 o'clock.
Therefore, distributing transmission time and transmission during subcarrier for a certain user, system is when being thought of as this user and distributing optimum transmission time and transmission subcarrier, and the uplink for this user distributes identical subcarrier with downlink transfer as far as possible.If in the time of can not distributing identical subcarrier for it, as far as possible be less than the subcarrier of 78 (i.e. 6 subbands) for this user's uplink and the downlink transfer distribution number of sub carrier wave of being separated by.
Concrete, when uplink and downlink transfer all use subband to transmit, distribute for uplink and downlink transfer as far as possible and be separated by less than the subband of 6 sub-bandwidth.Can guarantee like this that under the macrocell environment of suburb the correlation of the intersubband that the up-downgoing transmission is used is 0.5; Under the Microcell environment of urban district, the correlation of the intersubband that the up-downgoing transmission is used is for being slightly less than 0.5; And under the urban macro cell environment, the intersubband that the up-downgoing transmission is used also has certain correlation.And, can further improve the correlation of the intersubband of up-downgoing transmission use, thereby make under this allocation of subbands mode, the channel symmetry that the up-downgoing transmission can obtain to be similar to owing to use the method for interpolation.
When subband is used in descending transmission, and uplink is separated by less than the subcarrier of 78 subcarrier widths for uplink distribution and downlink transfer when using subcarrier to transmit as far as possible.This accomplishes for up being easy to of using a plurality of subcarriers to carry out transfer of data, thus the channel symmetry when having guaranteed the up-downgoing transmission.
Above mentioned correlation bandwidth can be set according to the channel circumstance of statistics, also can rule of thumb be worth and sets.
In sum, the communication means of wideband time division duplexing system provided by the present invention, it has made full use of in the correlation bandwidth of regulation subband in a certain transmission direction or the correlation between the subcarrier, method by interpolation, estimate in another transmission direction not at the subband of identical frequency band scope (perhaps overlapping) or the channel conditions of subcarrier, and utilize the channel conditions estimate to carry out transfer of data in another transmission direction.By such method, when guaranteeing to carry out frequency domain dispatching neatly, the assurance of maximum likelihood the up-downgoing channel transmitted symmetry of tdd systems.
Claims (11)
1. the communication means of a wideband time division duplexing system, wherein, this wideband time division duplexing system is divided into a plurality of subcarriers or subband with a carrier wave, and according to the channel circumstance of adding up, set correlation and corresponding correlation bandwidth thereof, this communication means may further comprise the steps:
Step 1:, be up direction and the down direction allocated subbands or the subcarrier of same user's data transmission according to the situation of the available resources of system;
Step 2: according to this user on the up/down direction of transfer of data subband or the channel conditions of subcarrier, in the correlation bandwidth scope, obtain this user on the descending/up direction of transfer of data subband or the channel conditions of subcarrier; And
Step 3: above-mentioned descending/up direction on, the channel conditions that utilize to obtain carries out transfer of data.
2. communication means as claimed in claim 1 is characterized in that described correlation bandwidth rule of thumb is worth given.
3. as claim 1 or 2 described communication meanss, it is characterized in that, in step 1, be the up direction and the identical subband or the subcarrier of down direction distribution of this user's data transmission.
4. as claim 1 or 2 described communication meanss, it is characterized in that in step 1, the up direction and the down direction that transmit for this user's data distribute be separated by subband or minimum subband or the subcarrier of number of subcarriers.
5. as claim 1 or 2 described communication meanss, it is characterized in that, in step 1, above-mentioned descending/subband on the up direction or subcarrier and above-mentioned up/subband on the down direction or subcarrier are not overlapping or overlap.
6. communication means as claimed in claim 3 is characterized in that, in step 2, directly use above-mentioned up/subband on the down direction or the channel conditions of subcarrier, as the channel conditions of subband on descending/up direction or subcarrier.
7. communication means as claimed in claim 4, it is characterized in that, in step 2, directly use above-mentioned up/subband on the down direction or subcarrier in descending/up direction on subband or subcarrier the be separated by minimum subband of number of subcarriers or the channel conditions of subcarrier, as the channel conditions of subband on descending/up direction or subcarrier.
8. communication means as claimed in claim 5 is characterized in that, in step 2, by above-mentioned up/down direction on, utilize the method for interpolation, obtain the subband on descending/up direction or the channel conditions of subcarrier.
9. communication means as claimed in claim 8, it is characterized in that, when the frequency band range of subband on up/down direction or subcarrier was positioned at the same side of frequency band range of subband on descending/up direction or subcarrier, the method for above-mentioned interpolation was to extrapolated value.
10. communication means as claimed in claim 8, it is characterized in that, when the frequency band range of subband on up/down direction or subcarrier laid respectively at the both sides of frequency band range of subband on descending/up direction or subcarrier, the method for above-mentioned interpolation was to interpolate value.
11. communication means as claimed in claim 5, it is characterized in that, in step 2, for above-mentioned up/subband on the down direction or subcarrier in descending/up direction on subband or subcarrier be separated by number of subcarriers less subband or subcarrier, directly use its channel conditions as the less subband of the number of carriers of being separated by with it on descending/up direction or the channel conditions of subcarrier, simultaneously, for above-mentioned descending/other subbands on the up direction or the channel conditions of subcarrier, by above-mentioned up/down direction on, utilize the method for interpolation to obtain.
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| CN101686466B (en) * | 2008-09-28 | 2012-11-21 | 华为技术有限公司 | Method, device and system of subchannel sharing |
| CN102098259B (en) * | 2010-08-05 | 2013-04-24 | 普天信息技术研究院有限公司 | Signal emission method in multi-subband orthogonal frequency division multiplexing (OFDM) system |
| CN103874203B (en) * | 2012-12-11 | 2017-05-31 | 普天信息技术研究院有限公司 | A kind of up channel distribution method of communication system |
| CN104010375B (en) * | 2013-02-22 | 2018-03-27 | 华为技术有限公司 | A kind of method, terminal and the base station of data communication |
| CN107197528B (en) * | 2016-03-14 | 2020-12-25 | 华为技术有限公司 | Method and device for scheduling and allocating resources |
| CN108347319B (en) * | 2017-01-24 | 2020-10-20 | 普天信息技术有限公司 | Resource allocation method and device |
| WO2019148499A1 (en) * | 2018-02-05 | 2019-08-08 | Nec Corporation | Methods and devices of resource mapping for data transmission and of data receiving |
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