CN102238627A - Resource allocating method and device of downlink shared channel - Google Patents
Resource allocating method and device of downlink shared channel Download PDFInfo
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Abstract
The invention discloses a resource allocating method and of a downlink shared channel. The resource allocating method comprises the steps of: 102, determining all possible PRB (Packet Receive Buffers) addressing ranges according to band width configuration of a system; 104, pre-allocating the PRB in each PRB addressing range according to the data quantity to be transmitted of current UE (User Equipment) and the channel information of the current UE so as to determine the pre-allocated PRB and the data quantity capable of being loaded by the pre-allocated PRB; and 106, determining a priority level of each PRB addressing range according to the pre-allocation processing result and the data quantity to be transmitted and determining the PRB addressing range having the highest priority level as the PRB addressing range to be allocated to the current UE so as to determine the PRB to be allocated to the current UE. According to the technical scheme in the invention, optimum PRB resources can be allocated to the UE on the premise that the QoS (Quality of Service) of the UE is guaranteed, such that the frequency spectrum resource of the system can be utilized effectively.
Description
Technical field
The present invention relates to the communications field, relate in particular to the resource allocation methods and the device of DSCH Downlink Shared Channel.
Background technology
LTE (Long Term Evolution, Long Term Evolution) system be one based on data service, the mixed service system of multiple business coexistence.The supported maximum system bandwidth of LTE system is 20MHz, in order to support broadband system better, the LTE system descending adopts OFDMA (OrthogonalFrequency Division Multiple Access, OFDM), at frequency domain whole wideband frequency selective channel is divided into a plurality of smooth subchannels, mutually orthogonal between each subchannel.Under the situation of multi-user service coexistence, can be according to the different QoS requirements of miscellaneous service, and user's channel condition distributes running time-frequency resource neatly, carries out transfer of data.
For QoS (the Quality of Service that satisfies miscellaneous service better, QoS) demand, utilize frequency spectrum resource efficiently, the LTE system has introduced shared channel mechanism, and the mode by Dynamic Resource Allocation for Multimedia realizes each user in the system, each professional resource-sharing.
In the LTE system, assignable minimal physical resource units is PRB (Physical ResourceBlock, a Physical Resource Block), and continuous width is that the physical resource of 180kHz becomes a PRB on time slot frequency domain.Three kinds of resource allocation type: type0, tyep1 and type2 have been defined at PDSCH (Physical Downlink Shared channel, DSCH Downlink Shared Channel) in the standard.Wherein type0 resource allocation type is that a RBG comprises the PRB of one group of continuous distribution with the smallest particles degree of RBG as resource allocation, and the size of RBG is relevant with system bandwidth; Type1 resource allocation type is that all RBG in the system bandwidth are divided into a plurality of subset of resources according to certain rule, the number of subset of resources is big or small identical with RBG's, be necessary for a UE and distribute PRB resource in the same subset of resources in a TTI, the minimum resource allocation granularity that type1 supports is 1 PRB; Type2 resource allocation type requires to distribute to one group of continuous VRB of user, and supports Localized and two kinds of VRB of Distributed resource mapping method to PRB.
The base station is when carrying out descending scheduling, at a TTI (Transmission Time Interval, Transmission Time Interval) interior to a UE (User Equipment, terminal) using wherein a kind of resource allocation type is its Resources allocation, and schedule information formed DCI (Downlink ControlInformation, Downlink Control Information), be designated as the resource location of its distribution to this UE by PDCCH.
Standard definition 10 kinds of DCI forms, wherein DCI format1/1A/1B/1C/1D/2/2A can be used for the control information of bearing downlink scheduling.In these DCI forms at the PDSCH definition, DCI format1/2/2A is used to indicate the type0/type1 resource allocation to distribute the transmission of the dispatch of type, and DCI format1A/1B/1C/1D is used to indicate the type2 resource allocation to distribute the transmission of the dispatch of type.
When using DCI format1/2/2A, the bit number that is used for the resource allocation indication is N
RBG, N wherein
RBGRBG (Resource Block Group, Resource Block group) number for the system bandwidth correspondence.When using type0 resource allocation type, use N
RBGIndividual bit carries out bitmap to each RBG respectively, and the bitmap value corresponding if RBG distributes to UE is 1, otherwise is 0; When using type1 resource allocation type, use N equally
RBGIndividual bit is designated as the PRB positional information that the user distributes, wherein
(P is the number of subset of resources) individual bit is used for the selection indication of subset of resources, because remaining
Individual bit is not enough to each PRB in the subset of resources is carried out addressing, therefore two PRB addressing ranges have been defined for each subset of resources, PRB number in each addressing range is identical, addressable PRB original position is determined (one of them value of side-play amount is 0) by side-play amount, in the DCI of correspondence, use 1 bit to be used for the indication of subset of resources bias internal amount, remaining
Individual bit is the size of addressing space, respectively each PRB in the addressing space is carried out bitmap.
Type 1 resource allocation type is that all RBG in the system bandwidth are divided into several subset of resources according to certain rule, corresponding two the PRB addressing ranges of each subset of resources, the PRB number that each addressing range comprises is identical, and addressable PRB original position is determined by side-play amount.The type1 resource allocation methods divides two steps to realize usually at present: the first step, determine the addressing range of resource allocation, the selection of PRB addressing range is usually according to the number of available PRB in the addressing range or according to the average CQI (channel quality indicator, channel quality indication) of (available) PRB in the addressing range; In second step, in the addressing range of determining, select suitable PRB resource.
When using type1 resource allocation type to carry out resource allocation, the PRB resource of distributing for same UE must be in certain addressing range, but UE is not quite similar usually at the channel condition of each PRB addressing range; On the other hand, the process of base station dispatcher operation dispatching is normally at first determined the priority of scheduling UE, and then finish resource allocation successively to each UE according to the UE priority orders, therefore when certain UE is carried out resource allocation, if what use is type1 resource allocation type, usually the resource in each PRB addressing range can also have nothing in common with each other with situation, so the selection meeting of PRB addressing range directly influences the performance of frequency selective scheduling.
As mentioned above, present normally used elder generation determines that mainly there are following two problems in the type1 resource allocation methods of PRB addressing range reallocation PRB resource:
1, select PRB addressing range and two processes of distribution PRB resource relatively independent, do not consider connecting each other between the two, what investigate usually when selecting the PRB addressing range is the overall performance of all PRB or all available PRB in the addressing range, and under a lot of situations, only can be assigned to part PRB resource in the addressing range for a UE, existing method can't guarantee to the user is assigned to optimum PRB resource, thereby systematic function is produced certain influence;
2, when selecting the PRB addressing range, only with the available PRB number of resources in the addressing range or average CQI as selecting foundation, the former does not consider the channel quality information of UE, can't guarantee the high efficiency of transmission of data, the latter does not consider available resource information in each addressing range, can't guarantee the real-time Transmission of data, these two kinds of methods all can not guarantee user's QoS demand effectively, and system spectral resources is utilized fully efficiently.
Summary of the invention
Consider the problems referred to above and make the present invention.
According to an aspect of the present invention, provide a kind of resource allocation methods of DSCH Downlink Shared Channel, this method may further comprise the steps: all possible PRB addressing range is determined in configuration according to system bandwidth; In each PRB addressing range, carry out the pre-allocation process of PRB respectively according to the channel information of the data to be transmitted amount of current UE and current UE, to determine preallocated PRB and can the data carried by data amount; And the priority of determining each PRB addressing range according to the result and the data to be transmitted amount of pre-allocation process, the PRB addressing range that priority is the highest is defined as distributing to the PRB addressing range of current UE, thereby determines to distribute to the PRB of current UE.
In addition, before carrying out pre-allocation process, this method also comprises: receive channel message.
Preferably, determine all possible PRB addressing range by subset of resources and bias.
Particularly, pre-allocation process comprises: according to the broad-band channel quality indication (CQI) information that the data to be transmitted amount and the current UE of current UE reports, and the number of the PRB that estimation need distribute for current UE; And in each PRB addressing range, select a plurality of PRB according to the number of the PRB that is estimated, determine that a plurality of PRB can data carried by data amount and corresponding modulation coding mode (Modulation and CodingScheme abbreviates MCS as).
Preferably, select the step of a plurality of PRB specifically to comprise: if the number of the available PRB in the PRB addressing range greater than the number of the PRB that is estimated, the sub-band channel quality that then reports according to described active user from available PRB indication selective sequential number from high to low equals a plurality of PRB of the number of the PRB that estimated; And if the number of available PRB in the PRB addressing range is not more than the number of the PRB that is estimated, then select all available PRB.
In addition, in each PRB addressing range, finish the preassignment of PRB after, writing down a plurality of PRB can the data carried by data amount and corresponding MCS.
Particularly, the processing of determining the priority of each PRB addressing range specifically comprises: preallocated PRB in data to be transmitted amount and each PRB addressing range can the data carried by data amount be compared, the PRB addressing range that preallocated PRB can the data carried by data amount be not less than the data to be transmitted amount is divided into first set, and preallocated PRB can the data carried by data amount be divided into second set less than the PRB addressing range of data to be transmitted amount, wherein, the priority of first set is greater than the priority of second set; And the priority orders of determining the PRB addressing range in first set and second set respectively.
Preferably, determine the order of the priority of the PRB addressing range in first set according to the MCS of preallocated PRB correspondence.
Preferably, according to preallocated PRB can the data carried by data amount size determine the order of the priority of the PRB addressing range in second set.
In addition, this method also comprises: at definite preallocated PRB or after determining to distribute to the PRB of current UE, determine to use corresponding M CS to carry out the number of the PRB of transfer of data institute actual needs distribution, if the number of the PRB that actual needs distributes is less than the number of selected PRB, then in selected a plurality of PRB, discharge the relatively low PRB of channel quality indication, wherein, the number of the PRB that the is discharged number that equals selected PRB deducts the number of the PRB that actual needs distributes.
According to a second aspect of the invention, provide a kind of resource allocation device of DSCH Downlink Shared Channel, this resource allocation device comprises: the addressing range determination module is used for according to the definite all possible PRB addressing range of system bandwidth configuration; The preassignment module is used for carrying out respectively in each PRB addressing range according to the channel information of the data to be transmitted amount of current UE and current UE the pre-allocation process of PRB, to determine preallocated PRB and can the data carried by data amount; And PRB determination module, be used for the priority of determining each PRB addressing range according to the result and the data to be transmitted amount of pre-allocation process, the PRB addressing range that priority is the highest is defined as distributing to the PRB addressing range of current UE, thereby determines to distribute to the PRB of current UE.
In addition, resource allocation device also comprises: receiver module was used for before carrying out pre-allocation process, from current UE receive channel message.
Preferably, the addressing range determination module is determined all possible PRB addressing range by subset of resources and bias.
Particularly, the preassignment module comprises: estimation block is used for the broad-band channel quality indication (CQI) information that data to be transmitted amount and current UE according to current UE report, the number of the PRB that estimation need distribute for current UE; And the selection module, be used in each PRB addressing range, selecting a plurality of PRB according to the number of the PRB that is estimated, determine that a plurality of PRB can data carried by data amount and corresponding MCS.
Preferably, if the sub-band channel quality indication selective sequential number from high to low that the number of the available PRB in the PRB addressing range greater than the number of the PRB that is estimated, then selects module to report according to current UE from available PRB equals a plurality of PRB of the number of the PRB that estimated; And if the number of available PRB in the PRB addressing range is not more than the number of the PRB that is estimated, then select module to select all available PRB.
In addition, this resource allocation device also comprises: logging modle, be used for after the processing of finishing the preassignment module, and writing down a plurality of PRB can data carried by data amount and corresponding MCS.
Preferably, in the PRB determination module, preallocated PRB in data to be transmitted amount and each PRB addressing range can the data carried by data amount be compared, the PRB addressing range that preallocated PRB can the data carried by data amount be not less than the data to be transmitted amount is divided into first set, and preallocated PRB can the data carried by data amount be divided into second set less than the PRB addressing range of data to be transmitted amount, wherein, the priority of first set is greater than the priority of second set; And the priority orders of determining the PRB addressing range in first set and second set respectively.
Preferably, determine the order of the priority of the PRB addressing range in first set according to the MCS of preallocated PRB correspondence.
Preferably, according to preallocated PRB can the data carried by data amount size determine the order of the priority of the PRB addressing range in second set.
In addition, this resource allocation device also comprises: release module, be used for after the preassignment module determines that preallocated PRB or PRB determination module are determined to distribute to the PRB of current UE, determine to use corresponding M CS to carry out the number of the PRB of transfer of data institute actual needs distribution, if the number of the PRB that actual needs distributes is less than the number of selected PRB, then in selected a plurality of PRB, discharge the relatively low PRB of channel quality indication, wherein, the number of the PRB that the is discharged number that equals selected PRB deducts the number of the PRB that actual needs distributes.
By technical approach of the present invention, at first in each PRB addressing range, finish the preassignment of PRB, by relatively making final resource allocation decisions, can under the QoS prerequisite that guarantees UE, guarantee thus to UE distributes optimum PRB resource, thereby guarantee the efficient utilization of system spectral resources again.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart that illustrates according to resource allocation methods of the present invention; And
Fig. 2 is the block diagram that illustrates according to resource allocation device of the present invention.
Embodiment
Describe embodiments of the invention in detail below in conjunction with accompanying drawing.
Key point of the present invention is in the resource allocation methods of DSCH Downlink Shared Channel type1 resource allocation type, in each PRB addressing range, finish the preassignment of PRB resource respectively according to the sub-band channel information of the broad-band channel information of terminal and the available resources in each addressing space, carry out resource allocation decisions, thereby finish resource allocation according to transfer of data requirement, scheduling UE Data-carrying ability and the efficiency of transmission of pre-allocation resource in each addressing space of scheduling UE then.
Fig. 1 is the flow chart that illustrates according to resource allocation methods of the present invention.
With reference to Fig. 1, this resource allocation methods comprises: step S102, and all possible PRB addressing range is determined in configuration according to system bandwidth; Step S104 carries out the pre-allocation process of PRB respectively according to the channel information of the data to be transmitted amount of current UE and current UE in each PRB addressing range, to determine preallocated PRB and can the data carried by data amount; And step S106, according to the priority that the result and the data to be transmitted amount of pre-allocation process are determined each PRB addressing range, the PRB addressing range that priority is the highest is defined as distributing to the PRB addressing range of current UE, thereby determines to distribute to the PRB of current UE.
In addition, before carrying out pre-allocation process, this method also comprises from the processing of current UE receive channel message.
In the present invention, preferably determine all possible PRB addressing range, suppose that the RBG subclass number under the current system bandwidth is P by subset of resources and bias, corresponding 2 side-play amounts of each subset of resources, then all possible PRB addressing range number is 2 * P.
For this method, key is the pre-allocation process and the resource allocation decisions process of PRB resource.Step S104 is corresponding to the pre-allocation process of PRB resource, and this process mainly is to carry out the selection of PRB resource respectively in each PRB addressing range respectively according to the channel quality information of the transfer of data demand of current scheduling UE and UE; Step S106 is corresponding to the resource allocation decisions process, and this process mainly is Data-carrying ability and the corresponding MCS by preassignment PRB resource in each PRB addressing range relatively, finally determines the PRB addressing range and is the PRB resource of UE distribution.Below these two processes are described respectively.
The pre-allocation process of PRB resource is at first described.It specifically comprises: according to the data to be transmitted amount of current UE and the channel information of current UE, and the number of the PRB that estimation need distribute for current UE; And in each PRB addressing range, select a plurality of PRB according to the number of the PRB that is estimated, determine that a plurality of PRB can data carried by data amount and corresponding MCS.Wherein, the channel information of using when the PRB number that estimation need distribute for current UE is the broadband CQI information that UE reports.
In the LTE system, descending CQI is measured by UE and reports the base station, and standard pin has defined 16 grades to descending CQI.Descending CQI reports and is divided into broadband CQI and reports with subband CQI and report, wherein broadband CQI reflection be UE on the whole system bandwidth average channel quality and subband CQI reflection be the channel quality of UE on the part bandwidth.According to the LTE standard code, subband that subband CQI reports size is relevant with system bandwidth, is 8 as the subband size of 20MHz system bandwidth correspondence, i.e. the granularity that reports as CQI with 8 PRB.The subband CQI that UE reports is the main foundation that frequency selective scheduling is carried out in the base station, and the base station is that UE distributes the PRB resource according to the subband CQI of UE, determines to transmit the MCS that adopts at the enterprising line data of these PRB according to the subband CQI of UE on these PRB simultaneously.Because the otherness of UE CQI on each subband under certain transfer of data demand, is selected the different corresponding different MCS of PRB possibility, therefore corresponding PRB number demand is also different, and then influences the PRB resource allocation conversely.Under normal conditions, there is some difference between each the subband CQI of UE and the broadband CQI, but the grade that generally differs is not too large, therefore before carrying out resource allocation, can at first estimate the resource allocation number demand of UE according to the channel information in the full bandwidth scope, as the PRB number upper limit of distributing, to reach the purpose that reduces the resource allocation complexity for this UE.
In each PRB addressing range, select PRB or whole PRB that can satisfy the transfer of data demand according to the estimation result, and the specific implementation process of calculating the processing that these PRB can the data carried by data amount is: if the available PRB number in the PRB addressing range is then selected the PRB resource that satisfies PRB number demand according to subband CQI order from high to low greater than the PRB demand number of being estimated in these available PRB; Otherwise pick out all these available PRB.Then, determine corresponding MCS according to AMC (Adaptive Modulation Coding, Adaptive Modulation and Coding) algorithm, and determine that further these PRB resources can the data carried by data amount according to the CQI of UE on these PRB.
In addition, according to above method, finish the PRB pre-allocation of resources in each PRB addressing range, writing down these PRB simultaneously can data carried by data amount and corresponding MCS.
Next the decision process of resource allocation is described.The basic thought of resource allocation decisions is the qos requirement that preferentially guarantees UE, is the demand that guarantees the UE transfer of data specific to each resource allocation, on this basis, improves the speed of transfer of data as far as possible, to improve system spectral efficiency.The resource allocation decisions process is as follows:
At first determine the priority of each PRB addressing range, specifically comprise:
According to preallocated PRB in current UE data to be transmitted amount and each PRB addressing range can data quantity transmitted comparative result, all PRB addressing ranges are divided into two S set 1 and S2, wherein, the PRB addressing range that data transmission capabilities is not less than the transfer of data demand is divided into S set 1, and data transmission capabilities is divided into S set 2 less than the PRB addressing range of transfer of data demand.Obviously, the PRB addressing range that satisfies the transfer of data demand has higher priority, and promptly the priority of two set is: S1＞S2;
Then, for each the PRB addressing range in the S set 1,,, can determine priority orders with the MCS of preallocated PRB correspondence in the addressing range in order to guarantee efficiency of transmission because its Data-carrying ability satisfies the transfer of data demand.MCS is high more, and efficiency of transmission is high more, and corresponding usually PRB number is few more, and its priority is also high more; And for each PRB addressing range in the S set 2, because its Data-carrying ability does not satisfy the transfer of data demand, in order to guarantee real time of data transmission as far as possible, can can carry data volume as the Determination of priority standard with preallocated PRB in the addressing range, it is big more to carry data volume, and corresponding priorities is high more.
After determining the priority of all PRB addressing ranges, the addressing range of current UE resource allocation just determined, the PRB that selects in this addressing space in the PRB pre-allocation process is the PRB resource of distributing to current UE.
Yet, because broadband CQI and subband CQI there are differences, if the average CQI of UE on selected PRB is higher than broadband CQI, these PRB are actual can the data carried by data amount may to surpass current UE data to be transmitted amount, at this situation, for fear of causing the wasting of resources, can determine to use this MCS to carry out the PRB number that the transfer of data actual needs distributes according to the MCS mode of UE data to be transmitted amount and selected PRB correspondence, the PRB number of Fen Peiing is less than the number of estimating the PRB that selects according to the channel information in the full bandwidth scope (broadband CQI) if desired, and then the PRB number demand according to reality discharges the relatively low PRB resource of CQI in these PRB that selected.This process can be carried out in pre-allocation process, also can carry out (for example, following first embodiment carries out after determining addressing range) after determining addressing range, can avoid the wasting of resources like this.
The idiographic flow of DSCH Downlink Shared Channel type1 resource allocation is described below in conjunction with 2 embodiment.
First embodiment
Suppose that the LTE system bandwidth is 5MHz, the PRB resource of PDSCH correspondence is divided into 2 subset of resources, and the PRB number that each subset of resources comprises is
(0≤p＜2), 2 side-play amounts of each subset of resources correspondence are respectively 0 and Δ
Shift(p) (Δ
Shift(p) ≠ 0), obtain 4 PRB addressing ranges thus, be designated as Ω respectively
i(0≤i＜4).
The data to be transmitted amount of supposing current scheduling UE is Data
Required, according to Data
RequiredAnd the PRB number that the channel information estimation in the full bandwidth scope of UE need be distributed to this UE is N
PRB, reqiured
Next, in each PRB addressing range, finish the PRB pre-allocation of resources.Particularly, suppose addressing range Ω
iInterior available PRB number is N
PRB, usable, i(0≤i＜4), wherein N
PRB, usable, 1And N
PRB, usable, 2Greater than N
PRB, reqiured, N
PRB, usable, 3And N
PRB, usable, 4Less than N
PRB, reqiured
For Ω
1And Ω
2, from wherein selecting N according to CQI order from high to low all available PRB
PRB, reqiuredIndividual PRB, according to UE at this N
PRB, reqiuredCQI on the individual PRB determines corresponding MCS, and calculate these PRB can data carried by data amount Data
Transfer, 1And Data
Transfer, 2
For Ω
3And Ω
4, therefrom select all available PRB, determine corresponding MCS according to the CQI of UE on these PRB, and calculate these PRB can data carried by data amount Data
Transfer, 3And Data
Transfer, 4
Then, current UE data to be transmitted amount can the data carried by data amount be compared with the PRB that selects in each PRB addressing range respectively, according to comparative result, all PRB addressing spaces are divided into two S set 1 and S2: promptly, will satisfy Data
Transfer, i〉=Data
ReqiuredAddressing space be divided into S1, otherwise be divided into S2.Suppose to comprise Ω among the S1 by relatively
1And Ω
3, comprise Ω among the S2
2And Ω
4
Because the priority of S set 1 is higher than the priority of S set 2, below only need relatively Ω
1And Ω
3Priority.Suppose MCS
1＜MCS
3, therefore the addressing range of the final current UE resource allocation of determining is Ω
3
Subsequently, according to the data to be transmitted amount of current UE and definite addressing range Ω
3In the MCS of the PRB resource correspondence selected calculate and use this MCS to carry out the PRB number that the transfer of data actual needs distributes, the PRB number that the actual needs of suppose to calculate distributes and from addressing range Ω
3In the PRB number selected equate, then from addressing range Ω
3In the PRB that selects be the PRB resource of distributing to current UE.
Second embodiment
Suppose that the LTE system bandwidth is 5MHz, the PRB resource of PDSCH correspondence is divided into 2 subset of resources, and the PRB number that each subset of resources comprises is
(0≤p＜2), 2 side-play amounts of each subset of resources correspondence are respectively 0 and Δ
Shift(p) (Δ
Shift(p) ≠ 0), obtain 4 PRB addressing ranges thus, be designated as Ω respectively
i(0≤i＜4).
In addition, the data to be transmitted amount of supposing current scheduling UE is Data
Required, according to Data
RequiredAnd the PRB number that the channel information estimation in the full bandwidth scope of UE need be distributed to this UE is N
PRB, reqiured
Next, in each PRB addressing range, finish the PRB pre-allocation of resources.Suppose addressing range Ω
iInterior available PRB number is N
PRB, usable, i, and N
PRB, usable, i≤ N
PRB, reqiured(0≤i＜4).For each addressing range, therefrom select all available PRB, determine the MCS that corresponding transfer of data is used according to the CQI of UE on these PRB, be designated as MCS
i(0≤i＜4), calculating these PRB simultaneously can data carried by data amount Data
Transfer, i(0≤i＜4).
Then, according to preallocated PRB in current UE data to be transmitted amount and each PRB addressing range can data quantity transmitted comparative result, all PRB addressing ranges are divided into two S set 1 and S2: promptly, will satisfy Data
Transfer, i〉=Data
ReqiuredAddressing space be divided into S1, otherwise be divided into S2.Suppose that S1 is empty, comprises Ω among the S2 by comparing
1, Ω
2, Ω
3And Ω
4The priority that needs 4 addressing spaces of comparison below.
Subsequently, relatively preallocated PRB can the data carried by data amount in 4 addressing ranges, supposes Data
Transfer, 2=max (Data
Transfer, i, 0≤i＜4), therefore finally being defined as current UE, to carry out the addressing range of resource allocation be Ω
2, the PRB that selects in this addressing range is the PRB resource of distributing to current UE.
Though specifically described two embodiment above, should be understood that the present invention is not limited to this, can make amendment to these embodiment, for example, in first embodiment, if the PRB number that actual needs distributes is less than from addressing range Ω
3In the PRB number selected, then from addressing range Ω
3In discharge the relatively low PRB resource of CQI in the PRB number selected.
In addition, this release is handled and can certainly be selected the PRB resource execution afterwards of satisfying PRB number demand to each PRB addressing range in pre-allocation process.
In addition, carried out many hypothesis in the foregoing description, but it should be appreciated by those skilled in the art, according to actual conditions multiple combination can have been arranged, detailed process is similar to the above embodiments, will repeat no more here.
Fig. 2 is the block diagram that illustrates according to resource allocation device of the present invention.
With reference to Fig. 2, resource allocation device 20 of the present invention comprises: addressing range determination module 202 is used for according to the definite all possible PRB addressing range of system bandwidth configuration; Preassignment module 204 is used for carrying out respectively in each PRB addressing range according to the channel information of the data to be transmitted amount of current UE and current UE the pre-allocation process of PRB, to determine preallocated PRB and can the data carried by data amount; And PRB determination module 206, be used for the priority of determining each PRB addressing range according to the result and the data to be transmitted amount of pre-allocation process, the PRB addressing range that priority is the highest is defined as distributing to the PRB addressing range of current UE, thereby determines to distribute to the PRB of current UE.
In addition, resource allocation device also comprises: receiver module was used for before carrying out pre-allocation process, from current UE receive channel message.
Preferably, the addressing range determination module is determined all possible PRB addressing range by subset of resources and bias.
Particularly, preassignment module 204 comprises: estimation block is used for the broadband CQI information that data to be transmitted amount and current UE according to current UE report, the number of the PRB that estimation need distribute for current UE; And the selection module, be used in each PRB addressing range, selecting a plurality of PRB according to the number of the PRB that is estimated, determine that a plurality of PRB can data carried by data amount and corresponding MCS.
If the number of the available PRB in the PRB addressing range greater than the number of the PRB that is estimated, then selects module to equal a plurality of PRB of the number of the PRB that estimated according to subband CQI selective sequential number from high to low from available PRB; And if the number of available PRB in the PRB addressing range is not more than the number of the PRB that is estimated, then select module to select all available PRB.
In addition, this resource allocation device also comprises: logging modle, be used for after the processing of finishing preassignment module 204, and writing down a plurality of PRB can data carried by data amount and corresponding MCS.
Preferably, in PRB determination module 206, preallocated PRB in data to be transmitted amount and each PRB addressing range can the data carried by data amount be compared, the PRB addressing range that preallocated PRB can the data carried by data amount be not less than the data to be transmitted amount is divided into first set, and preallocated PRB can the data carried by data amount be divided into second set less than the PRB addressing range of data to be transmitted amount, wherein, the priority of first set is greater than the priority of second set; And the priority orders of determining the PRB addressing range in first set and second set respectively.
Preferably, determine the order of the priority of the PRB addressing range in first set according to the MCS of preallocated PRB correspondence, and determine second the order of priority of PRB addressing range in gathering according to the size that preallocated PRB can the data carried by data amount.
In addition, this resource allocation device also comprises: release module, be used for after the preassignment module determines that preallocated PRB or PRB determination module are determined to distribute to the PRB of current UE, determine to use corresponding M CS to carry out the number of the PRB of transfer of data institute actual needs distribution, if the number of the PRB that actual needs distributes is less than the number of selected PRB, then in selected a plurality of PRB, discharge the relatively low PRB of channel quality indication, wherein, the number of the PRB that the is discharged number that equals selected PRB deducts the number of the PRB that actual needs distributes.
As mentioned above, in the resource allocation methods of the DSCH Downlink Shared Channel type1 that the present invention proposes, in each PRB addressing range, carry out the preassignment of PRB resource respectively according to the transfer of data demand of UE, and Data-carrying ability and average CQI by comparing preallocated PRB resource in each PRB addressing range, make final resource allocation decisions.By this method, can under the QoS prerequisite that guarantees UE, distribute the PRB resource of optimum, thereby improve the system spectral resources utilization ratio for UE.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (20)
1. the resource allocation methods of a DSCH Downlink Shared Channel is characterized in that, said method comprising the steps of:
All possible Physical Resource Block addressing range is determined in configuration according to system bandwidth;
In each Physical Resource Block addressing range, carry out the pre-allocation process of Physical Resource Block respectively according to the channel information of the data to be transmitted amount of active user's terminal and described active user's terminal, to determine preallocated Physical Resource Block and can the data carried by data amount; And
The priority of determining each Physical Resource Block addressing range according to the result and the described data to be transmitted amount of described pre-allocation process, the Physical Resource Block addressing range that priority is the highest is defined as distributing to the Physical Resource Block addressing range of described active user's terminal, thereby determines to distribute to the Physical Resource Block of described active user's terminal.
2. resource allocation methods according to claim 1 is characterized in that, before carrying out described pre-allocation process, described method also comprises: receive described channel massage from described active user's terminal.
3. resource allocation methods according to claim 1 is characterized in that, determines all possible Physical Resource Block addressing range by subset of resources and bias.
4. resource allocation methods according to claim 1 is characterized in that, described pre-allocation process comprises:
According to the data to be transmitted amount of described active user's terminal and the broad-band channel quality indication (CQI) information of described active user's terminal to report, estimation need be the number of the Physical Resource Block of described active user's terminal distribution; And
Number according to the Physical Resource Block of being estimated is selected a plurality of Physical Resource Block in each Physical Resource Block addressing range, determine that described a plurality of Physical Resource Block can data carried by data amount and corresponding modulation coding mode.
5. resource allocation methods according to claim 4 is characterized in that, selects the step of described a plurality of Physical Resource Block specifically to comprise:
If the number of the available physical resources piece in the Physical Resource Block addressing range is greater than the number of the Physical Resource Block of being estimated, then from described available physical resources piece, equal a plurality of Physical Resource Block of the number of the Physical Resource Block estimated according to the sub-band channel quality indication selective sequential number from high to low of described active user's terminal to report; And
If the number of the available physical resources piece in the Physical Resource Block addressing range is not more than the number of the Physical Resource Block of being estimated, then select all available Physical Resource Block.
6. according to claim 4 or 5 described resource allocation methods, it is characterized in that, finish the preassignment of Physical Resource Block in each Physical Resource Block addressing range after, writing down described a plurality of Physical Resource Block can data carried by data amount and corresponding modulation coding mode.
7. resource allocation methods according to claim 1 is characterized in that, determines that the processing of the priority of each Physical Resource Block addressing range specifically comprises:
Preallocated Physical Resource Block in described data to be transmitted amount and each Physical Resource Block addressing range can the data carried by data amount be compared, the Physical Resource Block addressing range that preallocated Physical Resource Block can the data carried by data amount be not less than described data to be transmitted amount is divided into first set, and preallocated Physical Resource Block can the data carried by data amount be divided into second set less than the Physical Resource Block addressing range of described data to be transmitted amount, wherein, the priority of described first set is greater than the priority of described second set; And
Determine the priority orders of the Physical Resource Block addressing range in described first set and described second set respectively.
8. resource allocation methods according to claim 7 is characterized in that, determines the order of the priority of the Physical Resource Block addressing range in described first set according to the modulation coding mode of preallocated Physical Resource Block correspondence.
9. resource allocation methods according to claim 7 is characterized in that, determines the order of the priority of the Physical Resource Block addressing range in described second set according to the size that preallocated Physical Resource Block can the data carried by data amount.
10. according to claim 4 or 7 described resource allocation methods, it is characterized in that described method also comprises:
At definite preallocated Physical Resource Block or after determining to distribute to the Physical Resource Block of described active user's terminal, determine to use corresponding modulation coding mode to carry out the number of the Physical Resource Block of transfer of data institute actual needs distribution, if the number of the Physical Resource Block that actual needs distributes is less than the number of selected Physical Resource Block, then in selected a plurality of Physical Resource Block, discharge the relatively low Physical Resource Block of channel quality indication, wherein, the number of the Physical Resource Block that the is discharged number that equals selected Physical Resource Block deducts the number of the Physical Resource Block that actual needs distributes.
11. the resource allocation device of a DSCH Downlink Shared Channel is characterized in that, described resource allocation device comprises:
The addressing range determination module is used for according to the definite all possible Physical Resource Block addressing range of system bandwidth configuration;
The preassignment module, be used in each Physical Resource Block addressing range, carrying out respectively the pre-allocation process of Physical Resource Block, to determine preallocated Physical Resource Block and can the data carried by data amount according to the channel information of the data to be transmitted amount of active user's terminal and described active user's terminal; And
The Physical Resource Block determination module, be used for the priority of determining each Physical Resource Block addressing range according to the result and the described data to be transmitted amount of described pre-allocation process, the Physical Resource Block addressing range that priority is the highest is defined as distributing to the Physical Resource Block addressing range of described active user's terminal, thereby determines to distribute to the Physical Resource Block of described active user's terminal.
12. resource allocation device according to claim 11 is characterized in that, described resource allocation device also comprises: receiver module, be used for before carrying out described pre-allocation process, and receive described channel massage from described active user's terminal.
13. resource allocation device according to claim 11 is characterized in that, described addressing range determination module is determined all possible Physical Resource Block addressing range by subset of resources and bias.
14. resource allocation device according to claim 11 is characterized in that, described preassignment module comprises:
Estimation block is used for according to the data to be transmitted amount of described active user's terminal and the broad-band channel quality indication (CQI) information of described active user's terminal to report, and estimation need be the number of the Physical Resource Block of described active user's terminal distribution; And
Select module, be used in each Physical Resource Block addressing range, selecting a plurality of Physical Resource Block, determine that described a plurality of Physical Resource Block can data carried by data amount and corresponding modulation coding mode according to the number of the Physical Resource Block of being estimated.
15. resource allocation device according to claim 14 is characterized in that,
If the number of the available physical resources piece in the Physical Resource Block addressing range is greater than the number of the Physical Resource Block of being estimated, then described selection module equals a plurality of Physical Resource Block of the number of the Physical Resource Block estimated according to the sub-band channel quality indication selective sequential number from high to low of described active user's terminal to report from described available physical resources piece; And
If the number of the available physical resources piece in the Physical Resource Block addressing range is not more than the number of the Physical Resource Block of being estimated, then described selection module is selected all available Physical Resource Block.
16. according to claim 14 or 15 described resource allocation devices, it is characterized in that, described resource allocation device also comprises: logging modle, be used for after the processing of finishing described preassignment module, and writing down described a plurality of Physical Resource Block can data carried by data amount and corresponding modulation coding mode.
17. resource allocation device according to claim 11 is characterized in that, in described Physical Resource Block determination module,
Preallocated Physical Resource Block in described data to be transmitted amount and each Physical Resource Block addressing range can the data carried by data amount be compared, the Physical Resource Block addressing range that preallocated Physical Resource Block can the data carried by data amount be not less than described data to be transmitted amount is divided into first set, and preallocated Physical Resource Block can the data carried by data amount be divided into second set less than the Physical Resource Block addressing range of described data to be transmitted amount, wherein, the priority of described first set is greater than the priority of described second set; And
Determine the priority orders of the Physical Resource Block addressing range in described first set and described second set respectively.
18. resource allocation device according to claim 17 is characterized in that, determines the order of the priority of the Physical Resource Block addressing range in described first set according to the modulation coding mode of preallocated Physical Resource Block correspondence.
19. resource allocation device according to claim 17 is characterized in that, determines the order of the priority of the Physical Resource Block addressing range in described second set according to the size that preallocated Physical Resource Block can the data carried by data amount.
20. according to claim 14 or 17 described resource allocation devices, it is characterized in that, described resource allocation device also comprises: release module, be used for after described preassignment module determines that preallocated Physical Resource Block or described Physical Resource Block determination module are determined to distribute to the Physical Resource Block of described active user's terminal, determine to use corresponding modulation coding mode to carry out the number of the Physical Resource Block of transfer of data institute actual needs distribution, if the number of the Physical Resource Block that actual needs distributes is less than the number of selected Physical Resource Block, then in selected a plurality of Physical Resource Block, discharge the relatively low Physical Resource Block of channel quality indication, wherein, the number of the Physical Resource Block that the is discharged number that equals selected Physical Resource Block deducts the number of the Physical Resource Block that actual needs distributes.
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