CN101005326A - Up reasource distributing method and radio communication system - Google Patents
Up reasource distributing method and radio communication system Download PDFInfo
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Abstract
The method includes steps: based on conditions of channel quality of users to be dispatched, the system assigns resources of pilot frequency (RPF), which is extended wider frequency band than bandwidth of data transmission, from the current dispatched unit of transmission time to each dispatched user of sending data; then, setting up special unit of transmission time, the system assigns resources of measuring pilot frequency (MPF) for not dispatched users. The invention also discloses a wireless communication system. The scheme makes users not dispatched in normal dispatch have more chance to send MPF so as to assign resources of MPF for more users, who can take part in up going dispatch. In addition, after assigning RPF from unit of transmission time for users going to transmit data, the invention no longer assigns resources of MPF for these users in same unit of transmission time so as to guarantee characteristic of low peak uniform ratio of single carrier wave.
Description
Technical field
The present invention relates to radio communication information transmission technology field, be meant a kind of uplink resource allocating method and a kind of wireless communication system especially.
Background technology
Traditional single-carrier technology has transmitted waveform low peak average ratio (PAPR) characteristic, makes the amplifying device of terminal equipment to work in the less range of linearity, thereby the amount of saving energy has reduced the cost of terminal, but its multiplex mode underaction.And OFDM inserts the characteristics that (OFDM) technology has flexmux, and can disturb by anti-multipath, in many communication systems, be used widely, but its unavoidable problem is exactly that its signal has higher PAPR, and this makes the application of OFDM technology in the up link of wireless communication system be restricted.
At present emerging a kind of single-carrier frequency division multiple access inserts (SC-FDMA) technology above-mentioned two kinds of technology is merged, by carrying out time-domain symbol---〉frequency domain sampling point mapping---〉processing of time domain waveform, the system that makes has not only kept single-carrier property but also can carry out convenient, flexible frequency division multiplexing.Be illustrated in figure 1 as the major technique schematic diagram of SC-FDMA, wherein, at first with the process Fourier transform of the time-domain signal shown in 101 (DFT) 102, transform to frequency domain, through subcarrier mapping (Sub-carrierMapping) 103, frequency-region signal is mapped to corresponding subcarrier at frequency domain, is transformed into time domain by inverse-Fourier transform (IFFT) conversion 104 again, then 105, send after time-domain signal added cyclic prefix CP.
On up direction, above-mentioned subcarrier mapping step in SC-FDMA, and the subcarrier mapping step that comprises in other FDMA technology (as OFDM technology etc.) has determined the frequency band that the user is shared.As shown in Figure 2, being subcarrier mapping schematic diagram, is sampling point to be concentrated be mapped to a certain section frequency domain shown in Fig. 2 a, and remaining sub-carrier positions adds 0, and is that sampling point is distributed on the subcarrier shown in Fig. 2 b, promptly inserts (L-1) individual 0 between per two sampling points.When L=1, the sample point of DFT output is mapped on the continuous sub-carriers, is called localized FDMA; When L＞1, be mapped on the equally spaced subcarrier, be called distributedFDMA, also be called pectination spectrum transmission means usually.The position that such user has been shone upon sampling point is exactly that other user adds 0 position, thereby each user keeps quadrature on frequency domain.This dual mode can both guarantee that the peak-to-average force ratio of transmitted waveform is lower, thereby improves the efficient of terminal power amplifier.
In present wireless communication system, recipient's demodulating data need be known corresponding channel information, utilize modes such as equilibrium to carry out effectively to improve receptivity behind the channel compensation, this normally sends the reference signal that receiving terminal is known by transmitting terminal, and channel estimating realizes and receiving terminal carries out according to this signal.In a multi-user's system, each user is transmitted the wireless channel path difference of experience, thereby channel fading separately is also inequality, causes the active user to have better transmission performance on some transmission band, and may the deep fading on some frequency band.From the viewpoint of system, in order to make power system capacity and throughput maximum, can utilize the otherness of transmitting between the different user fully, be commonly referred to multi-user diversity.The system of multi-user diversity is by utilizing the difference of user at aspects such as time, frequencies, by the efficient scheduling algorithm, guarantee power system capacity and throughput maximum, for different users disposes different time, band resource, making separately, transmission utilizes running time-frequency resource preferably.In up link, for the reliable demodulation user data and make full use of multi-user diversity, the base station receiving terminal need be known channel information on this user's the transmission band and the channel quality on the full range band, so that correctly carry out data demodulates and carry out efficient resource allocation for inserting the user.
In addition, a kind of sub-frame of uplink structure as shown in Figure 3 comprising two frequency pilot signs (P1, P2), is used for transmission of reference signals, promptly carries out coherent demodulation as pilot tone, and data symbol (Data), is used for control/transfer of data.General in order to follow the tracks of certain user's channel time-varying characteristics, as translational speed greater than user of 120km/h etc., based on such subframe structure, the channel quality information of user on resource outside the running time-frequency resource of transmission data known if desired in system, under the situation that does not increase the extra pilot-frequency expense of system, guarantee the better performances of demodulating data again, also will avoid the peak-to-average force ratio of too high transmitted waveform simultaneously, just need in the distribution of pilot tone and data resource, carry out rational distribution design.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of uplink resource allocating method and a kind of wireless communication system, can distribute the measurement pilot frequency resource, make them can participate in uplink scheduling for most users.
First aspect in order to achieve the above object the invention provides the uplink resource allocating method in a kind of running time-frequency resource dispatching patcher, and this method comprises:
System according to the channel quality conditions of dispatched users for each be scheduled for the user that sends data current scheduling to the transmission time unit in distribute and expand to than the more wide band pilot resources of data transfer bandwidth; And special transmission time unit is set, in this time transmission unit, distribute the measurement pilot frequency resource for the user who is not dispatched to.
Preferably, system is provided with described special transmission time unit and has periodically.
Preferably, system distributes to non-dispatched users with the data resource in the described special transmission time unit and is used for its transmission data, or distributes to dispatched users and/or non-dispatched users is used for control information transmission and real time business data.
Described control information comprises down channel quality indication (CQI) information and/or downlink data transmission affirmation (ACK/NACK) information and/or the uplink scheduling solicited message and/or the uplink random access information of feedback.
System can distribute to non-dispatched users with the data resource in will the be described special transmission time unit of the mode of dividing subband and be used for it and transmit data.
Preferably, to adopt the mode of frequency hopping in different described special transmission time unit be same user's distribute data resource in system.
Preferably, system be the user of all transmission data in the described special transmission time unit distribute with the road pilot resources be: one fixedly pectination or divide or the frequency division pilot resources for the sign indicating number that expands to full range with frequency band corresponding in the pilot resources of road with this user data.
The mode that system can divide with sign indicating number is distributed data and/or the pilot resources in the described special transmission time unit.
Preferably, described system according to the channel quality conditions of dispatched users for each be scheduled for the user that sends data current scheduling to the transmission time unit in distributes and expands to than data transfer bandwidth behind the more wide band pilot resources, system should the transmission time unit in remaining pilot resources distribute to non-user of transmitting data in should the transmission time unit and be used for the transmission measurement pilot tone.
System can with sign indicating number divide or the mode of frequency division be the transmission data that are dispatched to the user current scheduling to the transmission time unit in distribute and expand to than the more wide band pilot resources of data transfer bandwidth.
Preferably, the sign indicating number branch pilot tone that generates for the sequence that adopts normal amplitude zero auto-correlation CAZAC sequence cyclic shift to obtain of the described sign indicating number pilot tone of dividing.
Preferably, the pilot tone of described frequency division has the pectination spectral property.
Preferably, comprise a plurality of frequency pilot signs in the described transmission time unit, the frequency spectrum resource at least one frequency pilot sign in described a plurality of frequency pilot signs adopts described method to distribute.
Can there be identical or different structure described special transmission time unit and other transmission time unit, comprise symbol numbers, symbol lengths, protection interval and transmission time length, all can be identical or different respectively.
Preferably, described system is less than or equal to the maximum measurement frequency band of the average characteristics that can reflect channel for the measurement pilot frequency of user's distribution.
Preferably, the frequency band of described system is divided into a plurality of sub-bands, carries out the distribution of measurement pilot frequency respectively.
Preferably, in the multiple-input, multiple-output mimo system, system is same user's different transmit antennas and/or the user's that other is not dispatched to an antenna assignment measurement pilot frequency.
From above scheme as can be seen, among the present invention by system according to the channel quality conditions of dispatched users for each be scheduled for the user that sends data current scheduling to the transmission time unit in distribute and expand to than the more wide band pilot resources of data transfer bandwidth; And special transmission time unit is set, in this time transmission unit, distribute the measurement pilot frequency resource for the user who is not dispatched to, make the user who in normal consistency, is not scheduled for that the chance of more transmission measurement pilot frequency can be arranged, thereby distributed the measurement pilot frequency resource for most users, made them can participate in uplink scheduling;
In addition, among the present invention by in the transmission time unit for the transmission data the user distributed pilot resources after, no longer be that these users distribute the measurement pilot frequency resource in same transmission time unit, thereby guaranteed the characteristic of the low peak average ratio of single carrier.
Second aspect for achieving the above object the invention provides a kind of wireless communication system, and this system comprises:
The base station, be used for according to the channel quality conditions of dispatched users for each be scheduled for the user that sends data current scheduling to the transmission time unit distribute and expand to than the more wide band pilot resources of data transfer bandwidth, and be provided for distributing the special transmission time unit of measurement pilot frequency resource for the user who is not dispatched to, be that the user who is not dispatched to distributes the measurement pilot frequency resource in this transmission time unit, and will be handed down to user terminal for the pilot resources information that the user distributes;
User terminal is used to receive the resource information of base station for its distribution, and carries out the mapping of pilot tone according to this resource information.
Preferably, comprise in the described base station:
Resource distribution module, be used for according to the channel quality conditions of dispatched users for each be scheduled for the user that sends data current scheduling to the transmission time unit distribute and expand to than the more wide band pilot resources of data transfer bandwidth, and be provided for distributing the special transmission time unit of measurement pilot frequency resource for the user who is not dispatched to, be that the user who is not dispatched to distributes the measurement pilot frequency resource in this transmission time unit, and will send to sending module for the pilot resources information that the user distributes;
Sending module is used for the resource information from resource distribution module is sent to corresponding user terminal.
From above scheme as can be seen, the present invention is by being provided for distributing for the user who is not dispatched to the special transmission time unit of measurement pilot frequency resource in the base station of wireless communication system, in this transmission time unit, distribute the measurement pilot frequency resource for the user who is not dispatched to, make the user who in normal consistency, is not scheduled for that the chance of more transmission measurement pilot frequency can be arranged, thereby distributed the measurement pilot frequency resource for most users, made them can participate in uplink scheduling.
Description of drawings
The major technique schematic diagram that Fig. 1 inserts for single-carrier frequency division multiple access;
Fig. 2 is subcarrier mapping schematic diagram;
Fig. 3 is a kind of structural representation of sub-frame of uplink;
4 is the flow chart of the specific embodiment of the invention;
Fig. 5 is a kind of category-A subframe schematic diagram in the specific embodiment of the invention;
Fig. 6 is an another kind of category-A subframe schematic diagram in the specific embodiment of the invention;
The schematic diagram of Fig. 7 for carrying out resource allocation in the category-A subframe in sign indicating number branch mode in the specific embodiment of the invention;
Fig. 8 is a kind of category-B subframe schematic diagram in the specific embodiment of the invention.
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 accompanying drawing.
Main thought of the present invention is, system according to the channel quality conditions of dispatched users for each be scheduled for the user that sends data current scheduling to the transmission time unit in distribute and expand to than the more wide band pilot resources of data transfer bandwidth; And special transmission time unit is set, in this time transmission unit, distribute the measurement pilot frequency resource for the user who is not dispatched to.
Above-mentioned channel quality conditions according to dispatched users for each be scheduled for the user that sends data current scheduling to the transmission time unit in distribute when expanding to than the more wide band pilot resources of data transfer bandwidth, can adopt the method realization of pilot resources being carried out frequency division, also can adopt pilot resources is carried out the method realization that sign indicating number divides.
For above-mentioned special transmission time unit, system can be provided with in the cycle, should the transmission time unit as being provided with one in per 4 frames.Because in professional transmission course, the scheduling that the channel quality conditions that measurement pilot frequency calculated that some user's data service needed system sends according to the user is carried out running time-frequency resource distributes, and some user's data is professional because the characteristics of its data type, less as data volume, or this user's characteristics, be higher than 120km/h etc. as translational speed, do not need system to dispatch according to channel quality conditions, for guaranteeing that each user can both obtain transmitting the chance of data in the short period of time, thus among the present invention on the special transmission time unit that is provided with transmission do not need the data of dispatching.Therefore, the business datum amount that can also dispatch as required of system and do not need to carry out the dispatching services data volume and this class transmission is set does not temporarily participate in the transmission time unit of dispatched users business datum.Need dispatch and not need the user's that dispatches business datum amount, can when initiating the uplink request, report the size of data type that will send and the transmission situation of other parameter and data to determine according to the user to the base station.Owing to transmitted the data that do not need to carry out dispatched users on cycle and/or the interim this transmission time unit that is provided with, be that the user who participates in scheduling distributes the measurement pilot frequency resource simultaneously on this transmission time unit, thereby guaranteed that needing scheduling can both obtain ascending resource as early as possible with the user data that does not need to dispatch transmits.
In addition, data resource in the above-mentioned special transmission time unit also can be used for the control information of transmitting and scheduling user and non-dispatched users and real time business data etc., and wherein control information comprises that down channel quality indication (CQI) information and/or the downlink data transmission of feedback confirm (ACK/NACK) information and/or uplink scheduling solicited message and/or uplink random access information.
Usually system divides timing carrying out ascending resource, based on the transmission time unit be subframe, follow-up in this specification is that subframe is that example describes with above-mentioned transmission time unit all.And then, for distinguishing original transmission time unit in above-mentioned special transmission time unit and the system, in follow-up explanation with system in original transmission time unit be called the category-A subframe, the special transmission time unit of this class is called the category-B subframe.This two classes subframe can have identical structure of time slot among the present invention, also can have different structure of time slot, and as the number difference of pilot signal and/or data-signal in the two class subframes, or the length of pilot signal and/or data-signal is not equal.
Below the full range in the measurement pilot frequency of the full range in the explanation all refers to the scheduling bandwidth of system, and as the system of a 10M, and its scheduling bandwidth is 5M, thereby the measurement pilot frequency of full range is meant the pilot tone of measuring this scheduling bandwidth.And take than the more wide band frequency band range of data transmission frequency band with the road pilot tone, not exclusively be equal to above-mentioned full range.
The present invention is described in detail below by specific embodiment.
As shown in Figure 4, carry out for the present embodiment system that ascending resource distributes and the user according to the flow chart of the resource transmission information of distributing.Wherein, to be that example describes by the base station assigns ascending resource, the base station is set all after dates of category-B subframe therein in system, and present embodiment specifically may further comprise the steps:
In this step, the subframe type of current subframe is determined in the base station according to the cycle of predefined category-B subframe.
Step 402, the base station channel quality information and the resource allocation principle in the base station of dispatched users as required are dispatched users distribute data resource, and, will be handed down to the user for the resource information that the user distributes then for having distributed the user of data resource and other users to distribute pilot resources.
In this step, the base station is the measurement pilot frequency that sends before this of dispatched users as required, channel response on the full range band is analyzed, calculated the transmission quality of subscriber signal on each dispatch frequency range, and distribute transmission band or time for the user in conjunction with the transfer resource allocation rule of receiving terminal.For example, the criterion of setting channel quality is that (signal interference ratio SIR), and is divided into system bandwidth the dispatch frequency range of a plurality of basic granularities to signal interference ratio, such as setting basic dispatch frequency range is 1.25M etc., calculates the SIR of this user on all dispatch frequency ranges.Select the higher one or more continuous or discrete dispatch frequency range of sir value then, when needs guarantee the low peak average ratio characteristic, do not adopt discrete bandwidth assignment certainly.Resource allocation principle in the base station can be the principle that makes the power system capacity maximum, promptly make the throughput maximum of system, can also take into account fair principle, guarantee that promptly all users can both indiscriminate serviced arriving, or according to user's priority etc., be the running time-frequency resource of user's distribute data transmission.
And for pilot resources, in case being scheduled for, the user distributed the frequency ranges of data resource to use, will send at least one wideband with the road pilot tone, at this moment because a plurality of users that are scheduled for need the multiplexed pilot resource, therefore the subcarrier density with the road pilot tone is comparatively sparse under the frequency division mode, but can obtain information on other subcarrier at receiving terminal by effective interpolation algorithm, and can guarantee performance for estimating channel.
Wideband in the frequency division mode is an example with the road pilot tone, suppose that 1/4 subcarrier density just enough guarantees performance for estimating channel, among Fig. 5 in the subframe on the left side 3 user's frequency division multiplexing data transmission frequency band are arranged, also there are 3 users multiplexing among the therefore corresponding P1, a pilot resources residue can be arranged, as the white pilot resources part among the figure, this part pilot resources is distributed to non-current transmission data user and is sent measurement pilot frequency.Just have 4 users multiplexing in the frame of the right, pilot tone also just all uses, and does not have remaining measurement pilot frequency resource.
Since the present invention based on subframe structure be comprising subframe greater than a frequency pilot sign, adopt above-mentioned pilot distribution method so have one in a plurality of frequency pilot signs in can the category-A subframe at least, and other remaining frequency pilot signs adopt other pilot distribution methods.Here remaining the pilot distribution method that frequency pilot sign adopts, can be the mode with road pilot tone companion data frequency band, promptly the user that frequency band corresponding with data on the pilot resources is all distributed to these data of transmission of system be used to transmit this user with the road pilot tone; For example in the subframe that comprises two frequency pilot signs shown in Figure 5, P1 has adopted that above-mentioned each transmission data user's expand to the method for full range band with the road pilot tone, and P2 adopts is transmission data user's the mode with road pilot tone companion data frequency band, and such mode can provide better channel estimating performance.In addition, the pilot distribution method that the residue frequency pilot sign adopts, can also be the transmission data a plurality of users take same Comb Pilot with the road pilot tone, the base station also is divided into subband with this Comb Pilot according to the user's data frequency band and gives corresponding user, then remaining fixing pilot resources is as measurement pilot frequency, send measurement pilot frequency for other user by base station assigns, for example in the subframe that comprises two frequency pilot signs shown in Figure 6, what P1 had adopted above-mentioned each transmission data user expands to the method for full range band with the road pilot tone, and all transmission data users' take the method for same Comb Pilot with the road pilot tone and P2 has adopted.
If after the user for the transmission data distributes pilot resources, the pilot resources of this time-domain position still has residue, then can again pilot resources be distributed to other users, these users on the reference signal with self is mapped to the Comb Pilot of its distribution after, as these users' measurement pilot frequency.Concrete mode of distributing measurement pilot frequency can be that system directly distributes to non-current transmission data user with it and is used for the transmission measurement pilot tone; Also the part in the above-mentioned residue pilot resources can be distributed to non-current transmission data user and be used to send measurement pilot frequency, another part distributes as other purposes, is used for control information transmission or data etc. as non-current transmission data user.For example, comprise three pectination frequency spectrums in the residue pilot resources, system can all distribute to it user of different non-current transmission data as measurement pilot frequency, also can be with one of them or two users that distribute to different non-current transmission data as measurement pilot frequency, another distributes as other purposes.
For distributing to the pectination frequency spectrum of non-transmission data user as the transmission measurement pilot tone, system can distribute to each Comb Pilot a user, also can be with behind the remaining Comb Pilot frequency division, distribute to different users, distribute to different users after perhaps remaining Comb Pilot being decomposed into the more sparse a plurality of Comb Pilot of broach again.System can distribute the shared pectination frequency spectrum of measurement pilot frequency for the user according to non-transmission data user's priority, or the partial-band in the pectination frequency spectrum, and will be notified to these users for the measurement pilot frequency information that these users distribute, after the user receives notice, promptly the rule of the time domain of notifying simultaneously according to the rule of predefined time domain or by system is carried out the pilot tone mapping, up to this user be scheduled for send data and sent wideband with the road pilot tone, or because till factor such as priority is low stopped to send measurement pilot frequency by notifications.Time domain rule wherein is meant that the user sends the cycle of measurement pilot frequency, sends once as per three transmission time unit.
The mode that the method for salary distribution of this pilot resources can also adopt sign indicating number to divide realizes.For example will have the sequence that obtains behind the sequence cyclic shift of normal amplitude zero auto-correlation (CAZAC) characteristic sign indicating number sequence as quadrature, each sequence is as a code channel, system distributes a code channel to shine upon this user's pilot signal for the user of each transmission data, as shown in Figure 7, then system can obtain the channel quality information of each transmission data user's full range band, if shine upon its measurement pilot signals and have residue code channel, system they can also be distributed to other current users of not transmitting data.
Step 403, the user who receives the Resources allocation information that the base station sends are mapped to and form the category-A subframe on the frequency spectrum resource and transmit according to the data and/or the reference signal of this information with self.
In this step, the user who receives the Resources allocation information that the base station sends with self data and/or reference signal be mapped to transmit on the frequency spectrum resource after, the multiplexing base station that sends in the category-A subframe.
After step 404, base station receive above-mentioned category-A subframe, according to the user with the road pilot tone user data is carried out demodulation, and obtain each user's channel quality information according to measurement pilot frequency.
After this step, the user service data that the base station can be dispatched needs according to the user's who obtains by category-A subframe and category-B subframe channel quality information in scheduling next time carries out scheduling of resource.Fig. 5 shows the time-frequency structure of user data and latter two category-A subframe of pilot frequency multiplexing, wherein there is A, B and three users' of C business datum to be assigned with data transmission frequency band in Zuo Ce the category-A subframe, and in other different moment, be that A, B, C and four users' of D business datum has been distributed frequency ranges of data according to other information such as user channel quality information and priority.Such resource allocation all may be different users in every frame.
Because for guaranteeing that the current user who is not scheduled for still can be assigned to the measurement pilot frequency resource, participate in the scheduling of resource of next time to have an opportunity, disposed the category-B subframe of cycle appearance in the system, the measurement pilot frequency resource that is used to provide fixing is to distribute to the user who is not scheduled for, and the data resource in such subframe is used for distributing to the data service that does not participate in dispatching, to adapt to the needs of different business.
In this case, the distribution of data transmission resources is no longer dispatched according to channel quality, but carries out in some fixing modes.For example, system bandwidth is divided into several equal transmission subbands, give user's transmission of data signals with different bandwidth assignment, the frequency ranges of data that distributes for these users can carry out frequency hopping in different category-B subframes, obtaining the gain of frequency diversity, can also be according to this user provide a channel quality measurement at a slow speed with the road pilot tone.
And these the transmission data user take same Comb Pilot with the road pilot tone, the base station also is divided into subband with this Comb Pilot according to the user's data frequency band and gives corresponding user, then remaining fixing pilot resources sends measurement pilot frequency for the user who is not scheduled for as measurement pilot frequency by base station assigns.Here, the user who is not scheduled for is included in the user and the Xin that are not scheduled in the last scheduling and adds the user who participates in scheduling.In addition, since the present invention based on subframe structure be comprising subframe greater than a frequency pilot sign, so can be that the frequency pilot sign that has at least in the category-B subframe adopts above-mentioned pilot distribution method, and other remaining frequency pilot signs adopt other pilot distribution methods.Here remain other pilot distribution methods that frequency pilot sign adopts, it can be mode with road pilot tone companion data frequency band, it can also be Comb Pilot of distribution for the user of each transmission data, for the transmission data user distribute Comb Pilot after remaining pilot resources as measurement pilot frequency, send measurement pilot frequency for other user by base station assigns.When distributing the measurement pilot frequency resource, preferentially pilot resources is distributed to the user who in last once scheduling, participates in scheduling but be not scheduled for, specifically divided timing to carry out according to these users' priority for the user of in the category-B subframe, not transmitting data.
As shown in Figure 8, for after system carries out resource allocation in the different moment, the resource allocation conditions of two category-B subframes, wherein, by being different, make these users when sending data, also carry out channel quality measurement at a slow speed constantly for different user distributes different frequency bands.
The data in the category-B subframe and/or the method for salary distribution of pilot resources also can be the sign indicating number branch, and at this moment the generating mode of data in this subframe and/or pilot tone can adopt the sign indicating number branch mode that is different from the category-A subframe.For example frequency pilot sign adopts the orthogonal sequence that is obtained by the displacement of CAZAC sequence period to generate, the all or part of measurement pilot frequency resource that is used as of the code channel that these sequences obtain, and data symbol can adopt Walsh (walsh) sequence of quadrature or other frequency expansion sequence to generate, carry out multiplexing and emission in the CDMA mode of routine, as the user code branch, and user's data and carry out the multiplexing of I/Q branch road with the road pilot tone.All symbols in also can the category-B subframe all adopt conventional CDMA sign indicating number branch mode, and tell the part resource as the user's measurement pilot frequency resource that participates in scheduling but be not scheduled in the code channel that each symbol generates.After distributing measurement pilot frequency for the user who participates in scheduling but be not scheduled for, remaining code channel can be used for the transmission of non-dispatch user data and control information and accordingly with the road pilot transmission.And the frame structure of category-B subframe can be different from the category-A subframe, all can all or distinguish different as wherein comprise symbol numbers, symbol lengths, protection interval and transmission time length etc.
Step 406, the user who receives the Resources allocation information that the base station sends are mapped to and form the category-B subframe on the frequency spectrum resource and transmit according to the data and/or the reference signal of this information with self.
In this step, the user who receives the Resources allocation information that the base station sends with self data and/or reference signal be mapped to transmit on the frequency spectrum resource after, promptly be multiplexed into a category-B subframe and sent to the base station.
Because the user is when carrying out the channel frequency measurement, only need be an average characteristics that can reflect channel, the maximum that promptly can guarantee to measure the channel of best quality is measured to measure in the frequency band and is got final product, therefore divide timing carrying out measurement pilot frequency among the present invention, measure frequency band according to this maximum and distribute, measure the bandwidth of frequency band greater than this maximum and measured with regard to not needing.For example the bandwidth of 5M enough reflects the average characteristics of channel, then above-mentioned maximum band scope of distributing for measurement pilot frequency can be 5M, if the frequency band of system is 10M, then the frequency band of this 10M can be divided into and respectively be two parts sub-band of 5M, carry out the distribution of measurement pilot frequency respectively.
After step 407, base station receive above-mentioned category-B subframe, according to the user with the road pilot tone user data is carried out demodulation, and obtain each user's channel quality information according to measurement pilot frequency.
Further, said method can be applied in multiple-input, multiple-output (MIMO) system, and the measurement pilot frequency resource of this moment also can be distributed to same user's different transmit antennas, is used for carrying out emitting antenna selecting, obtains diversity gain.And when carrying out many antennas when transmitting simultaneously, for each antenna assignment quadrature of each user of being dispatched to the road pilot tone, and be other user's who is not dispatched to antenna assignment measurement pilot frequency.
It more than is detailed description to resource allocation methods of the present invention.A kind of wireless communication system also is provided among the present invention, has described below.
Wireless communication system provided by the invention comprises: base station and user terminal.Wherein, the base station is used for distributing the pilot resources that expand to full range for each is scheduled for the user who sends data in the transmission time unit of correspondence according to the channel quality conditions of dispatched users, and be provided for distributing the special transmission time unit of measurement pilot frequency resource for the user who is not dispatched to, be that the user who is not dispatched to distributes the measurement pilot frequency resource in this transmission time unit, and will be handed down to user terminal for the frequency spectrum resource information that the user distributes.User terminal is used to receive the frequency spectrum resource information of base station for its distribution, and carries out the mapping of data and/or pilot tone according to this frequency spectrum resource information.
Concrete, the base station is with comprising resource distribution module and sending module, wherein resource distribution module is used for distributing the pilot resources that expand to full range for each is scheduled for the user who sends data in the transmission time unit of correspondence according to the channel quality conditions of dispatched users, and be provided for distributing the special transmission time unit of measurement pilot frequency resource for the user who is not dispatched to, be that the user who is not dispatched to distributes the measurement pilot frequency resource in this transmission time unit, and will send to sending module for the frequency spectrum resource information that the user distributes.Sending module is used for the frequency spectrum resource information from resource distribution module is sent to corresponding user terminal.
The situation that resource distribution module in the above-mentioned base station further specifically carries out resource allocation, no longer describes in detail consistent in the resource allocation methods of the present invention here with above-mentioned.
Be appreciated that the above only for preferred embodiment of the present invention, or not within the spirit and principles in the present invention not all in order to restriction the present invention, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (19)
1, a kind of uplink resource allocating method is characterized in that, this method comprises:
System according to the channel quality conditions of dispatched users for each be scheduled for the user that sends data current scheduling to the transmission time unit in distribute and expand to than the more wide band pilot resources of data transfer bandwidth; And special transmission time unit is set, in this time transmission unit, distribute the measurement pilot frequency resource for the user who is not dispatched to.
2, method according to claim 1 is characterized in that, the described special transmission time unit of system's setting has periodically.
3, method according to claim 1, it is characterized in that, system distributes to non-dispatched users with the data resource in the described special transmission time unit and is used for its transmission data, or distributes to dispatched users and/or non-dispatched users is used for control information transmission and real time business data.
4, method according to claim 3, it is characterized in that described control information comprises down channel quality indication (CQI) information and/or downlink data transmission affirmation (ACK/NACK) information and/or the uplink scheduling solicited message and/or the uplink random access information of feedback.
5, method according to claim 3 is characterized in that, system is used for its transmission data by the mode of subband frequency division the data resource in the described special transmission time unit is distributed to non-dispatched users.
6, method according to claim 5 is characterized in that, system adopts the mode of frequency hopping in different described special transmission time unit be same user's distribute data resource.
7, method according to claim 3, it is characterized in that, system be the user of all transmission data in the described special transmission time unit distribute with the road pilot tone be: fixing band resource corresponding in the Comb Pilot, or divide or the frequency division pilot resources for the sign indicating number that expands to full range with this user data.
8, method according to claim 3 is characterized in that, the mode that system divides with sign indicating number is distributed data and/or the pilot resources in the described special transmission time unit.
9, method according to claim 1, it is characterized in that, described system according to the channel quality conditions of dispatched users for each be scheduled for the user that sends data current scheduling to the transmission time unit in distribute expand to the pilot resources wideer than data transfer bandwidth after, system should the transmission time unit in remaining pilot resources distribute to non-should the transmission time unit in the user of transmission data be used for the transmission measurement pilot tone.
10, method according to claim 1 is characterized in that, system divide with sign indicating number or the mode of frequency division be the transmission data that are dispatched to the user current scheduling to the transmission time unit in distribute and expand to than the more wide band pilot resources of data transfer bandwidth.
11, according to claim 7 or 10 described methods, it is characterized in that the sign indicating number branch pilot tone that the pilot tone that described sign indicating number divides generates for the sequence that adopts normal amplitude zero auto-correlation CAZAC sequence cyclic shift to obtain.
12, method according to claim 10 is characterized in that, the pilot tone of described frequency division has the pectination spectral property.
13, according to arbitrary described method in claim 1 to 10 and the claim 12, it is characterized in that, comprise a plurality of frequency pilot signs in the described transmission time unit, the frequency spectrum resource of at least one frequency pilot sign in described a plurality of frequency pilot signs adopts described method to distribute.
14, according to arbitrary described method in claim 1 to 10 and the claim 12; it is characterized in that; there is identical or different structure described special transmission time unit and other transmission time unit; comprise symbol numbers, symbol lengths, protection interval and transmission time length, all can be identical or different respectively.
According to arbitrary described method in arbitrary in claim 1 to 10 and the claim 12, it is characterized in that 15, the measurement pilot frequency that described system distributes for the user is less than or equal to the maximum of the average characteristics that can reflect channel and measures frequency band.
16, according to arbitrary described method in claim 1 to 10 and the claim 12, it is characterized in that the frequency band of described system is divided into a plurality of sub-bands, carry out the distribution of measurement pilot frequency respectively.
17, as arbitrary described method in claim 1 to 10 and the claim 12, in the multiple-input, multiple-output mimo system, system is same user's different transmit antennas and/or the user's that other is not dispatched to an antenna assignment measurement pilot frequency.
18, a kind of wireless communication system is characterized in that, this system comprises:
The base station, be used for according to the channel quality conditions of dispatched users for each be scheduled for the user that sends data current scheduling to the transmission time unit distribute and expand to than the more wide band pilot resources of data transfer bandwidth, and be provided for distributing the special transmission time unit of measurement pilot frequency resource for the user who is not dispatched to, be that the user who is not dispatched to distributes the measurement pilot frequency resource in this transmission time unit, and will be handed down to user terminal for the pilot resources information that the user distributes;
User terminal is used to receive the resource information of base station for its distribution, and carries out the mapping of pilot tone according to this resource information.
19, method according to claim 18 is characterized in that, comprises in the described base station:
Resource distribution module, be used for according to the channel quality conditions of dispatched users for each be scheduled for the user that sends data current scheduling to the transmission time unit distribute and expand to than the more wide band pilot resources of data transfer bandwidth, and be provided for distributing the special transmission time unit of measurement pilot frequency resource for the user who is not dispatched to, be that the user who is not dispatched to distributes the measurement pilot frequency resource in this transmission time unit, and will send to sending module for the pilot resources information that the user distributes;
Sending module is used for the resource information from resource distribution module is sent to corresponding user terminal.
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