CN101895988A - Control channel resource allocation method and device - Google Patents

Control channel resource allocation method and device Download PDF

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CN101895988A
CN101895988A CN2009100855009A CN200910085500A CN101895988A CN 101895988 A CN101895988 A CN 101895988A CN 2009100855009 A CN2009100855009 A CN 2009100855009A CN 200910085500 A CN200910085500 A CN 200910085500A CN 101895988 A CN101895988 A CN 101895988A
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cce
dci
polymerization
descending
degree
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CN101895988B (en
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谭源春
彭佛才
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Abstract

The invention discloses a control channel resource allocation method, which comprises that: a base station calculates a public-space control channel elements (CCE), allocates the CCEs to downlink control information (DCI) which the public-space CCEs are to be allocated to, and maps the CCEs allocated to the DCI to a physical downlink control channel (PDCCH); the base station calculates a CCE polymerization degree, and takes the value of the CCE polymerization degree to calculate the CCEs required in the allocation; and the base station allocates the CCEs to the DCI of each scheduling user equipment (UE), and maps the CCEs allocated to the DCI to the PDCCH. Correspondingly, the invention provides a control channel resource allocation device, which comprises a public-space CCE allocation unit, a CCE master control unit, a CCE allocation unit and a mapping processing unit. Therefore, the method and the device can improve the success rate of the CCE allocation and utilization rate of the CCE.

Description

A kind of distribution method of control channel resource and device
Technical field
The present invention relates to the communications field, particularly relate to a kind of distribution method and device of control channel resource.
Background technology
Long Term Evolution (LTE, Long Term Evolution) is a transition between 3G and the 4G technology, wherein, the LTE technology has defined Physical Downlink Control Channel (PDCCH, Physical Downlink ControlChannel), this PDCCH is made of control channel unit (CCE, Control Channel Element), be used for bearing downlink control information (DCI, Downlink Control Information).DCI is used for the mandate of Physical Uplink Shared Channel (PUSCH, Physical Uplink Shared CHannel) resource and the distribution of Physical Downlink Shared Channel (PDSCH, Physical Downlink Shared CHannel) resource etc.CCE is for distributing the minimum unit of control corresponding channel resource to each user, this CCE is divided into public space CCE and private space CCE.
Generally speaking, DCI is carried out in the CCE assigning process, the CCE degree of polymerization L that is adopted (Aggregation level L) is a definite value, distribute simply like this, but the success rate that makes CCE distribute is lower, and has reduced the utilance of CCE.Therefore, press for the measure of a kind of efficient allocation CCE.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of distribution method and device of control channel resource, can improve the utilance that is distributed into power and CCE of CCE.
For achieving the above object, the invention discloses a kind of distribution method of control channel resource, comprise: public space control channel unit CCE is calculated in the base station, the Downlink Control Information DCI that is public space CCE to be allocated distributes CCE, and the CCE that will distribute to DCI is mapped to physical downlink control channel PDCCH; The CCE degree of polymerization is calculated in the base station, and the value of the taking-up CCE degree of polymerization is come the required CCE of dispensed; CCE is distributed to the DCI of each scheduling user's set UE in the base station, and the CCE that will distribute to DCI is mapped to PDCCH.
Wherein, the step of described base station calculating public space CCE comprises: calculate total CCE; Get minimum value in total CCE number and 16 as public space CCE number.
Wherein, described DCI for public space CCE to be allocated distributes CCE to comprise: DCI is taken out successively in the base station from the DCI formation of public space CCE to be allocated; According to the CCE degree of polymerization is 4, is calculated as the CCE of the DCI distribution of being taken out, and carries out the distribution of CCE to this DCI.
In the said method, described base station is calculated the CCE degree of polymerization and is comprised: calculate the up available CCE degree of polymerization and the descending available CCE degree of polymerization, wherein, the maximum of this up available CCE degree of polymerization is: the ratio of distributing to the number of the CCE number of up DCI and this up DCI, and round up and be set { 1,2,4, the minimum value among the 8}; The maximum of this descending available CCE degree of polymerization is: distribute to the ratio of the number of the CCE number of descending DCI and this descending DCI, and round up into gather 1,2,4, the minimum value among the 8}; Wherein, the described CCE number of distributing to up DCI is: the CCE number that up DCI is occupied in remaining CCE; The described CCE number of distributing to descending DCI is: the CCE number that descending DCI is occupied in remaining CCE; Described remaining CCE is: deduct the resulting CCE of public space CCE that distributes to DCI from total CCE; When this descending DCI was DCI2/2A, the value of the CCE degree of polymerization that this DCI2/2A can use was since 2 values; If earlier descending DCI is distributed CCE, then requires the up available CCE degree of polymerization to comprise two values 1 and 2 at least; If earlier up DCI is distributed CCE, then requires the descending available CCE degree of polymerization to comprise two values 1 and 2 at least.
Wherein, the value of the described taking-up CCE degree of polymerization comes the required CCE of dispensed to comprise: the DCI of CCE to be allocated is taken out from high to low successively according to the priority in the DCI formation of each scheduling UE in the base station; Take out a value from small to large successively the value of the CCE degree of polymerization that can use from the DCI of CCE to be allocated, come the required CCE of dispensed by hash function; Wherein, this DCI formation of respectively dispatching UE comprises up DCI formation and descending DCI formation.
In the said method, after the step of the CCE that described dispensed is required, this method also comprises: the base station judges whether the CCE that calculates is occupied, if unoccupied, then the CCE that this is calculated distributes to this DCI; If occupied, check then in the PDCCH candidate number whether unappropriated CCE is arranged, if having, then distribute to this DCI; If there is not unappropriated CCE, then from the CCE degree of polymerization of this DCI, take out a value more from small to large successively, the CCE that dispensed is required successfully is assigned to CCE or has got the value of the CCE degree of polymerization that this DCI can use up to this DCI.
Wherein, the described CCE that will distribute to DCI is mapped to after the step of Physical Downlink Control Channel, this method also comprises: the use information of CCE is upgraded in the base station, and this renewal operation is specially: the user mode of occupied CCE is revised as seizure condition, and calculates remaining CCE number.
For realizing said method, the invention provides a kind of distributor of control channel resource, comprise: public space CCE allocation units, CCE main control unit, CCE allocation units and mapping processing unit, wherein, public space CCE allocation units, be used to calculate public space CCE, and be the DCI distribution CCE of public space CCE to be allocated, notice mapping processing unit and CCE main control unit then; The CCE main control unit is used to calculate the CCE degree of polymerization; The CCE allocation units are used to take out the value of the CCE degree of polymerization that described CCE main control unit calculates, and come the required CCE of dispensed, and distribute CCE to DCI of each scheduling UE, then notice mapping processing unit; The mapping processing unit, the CCE that is used for distributing to DCI is mapped to PDCCH.
In the said apparatus, described CCE allocation units comprise: descending CCE distributes subelement and up CCE to distribute subelement, wherein, descending CCE distributes subelement, be used for taking out successively from small to large the value of the descending available CCE degree of polymerization that described CCE main control unit calculates, come the required CCE of dispensed, the use information that the CCE that provides according to the CCE main control unit also is provided judges whether the CCE that calculates is occupied, and to descending DCI distribution CCE, and the CCE that notifies described mapping processing unit will distribute to descending DCI is mapped to PDCCH, upgrade the use information of current C CE then, and distribute the subelement interactive information with up CCE; Up CCE distributes subelement, be used for taking out successively from small to large the value of the up available CCE degree of polymerization that described CCE main control unit calculates, come the required CCE of dispensed, the use information that the CCE that provides according to the CCE main control unit also is provided judges whether the CCE that calculates is occupied, and to up DCI distribution CCE, and the CCE that notifies described mapping processing unit will distribute to descending DCI is mapped to PDCCH, upgrade the use information of current C CE then, and distribute the subelement interactive information with descending CCE.
Wherein, said apparatus also comprises: scheduler, be used for providing the DCI formation of public space CCE to be allocated, the up DCI formation that distributes subelement to provide respectively to dispatch UE to described up CCE and distribute subelement that the descending DCI formation of respectively dispatching UE is provided to described descending CCE to described public space CCE allocation units.
As can be seen from the above technical solutions, the distribution method of control channel resource of the present invention and device can improve the success rate of CCE distribution and the utilance of CCE, that is:
In the assigning process of public space CCE, for saving the expense of public space CCE, getting the CCE degree of polymerization is 4, comes the required CCE of dispensed.The public space CCE that saves can distribute to the DCI of each scheduling user's set (UE).So, improved the utilance of CCE.
Distribute in the CCE process at DCI, dispatch dispensed such as the number of the DCI of UE, remaining CCE number by each to the number of the CCE of DCI and the CCE degree of polymerization that this DCI can use to each scheduling UE.Therefore, the CCE degree of polymerization that this DCI can use can change according to the number of the CCE of reality and concrete DCI, and, by ascending value successively from the value set of this CCE degree of polymerization, can realize repeatedly calculating the CCE of this DCI that distributes to.Specifically, when the CCE that calculates when the value by the degree of polymerization of once taking out is occupied, can be once more take out the value of another degree of polymerization successively and come the required CCE of dispensed from this value set, the value that successfully is assigned to CCE or this CCE degree of polymerization up to this DCI is got time.So, not only improve the success rate of distributing CCE, also improved the utilance of CCE.
Description of drawings
Fig. 1 is the realization flow schematic diagram of the distribution method of control channel resource of the present invention;
Fig. 2 is the allocation flow schematic diagram of public space CCE of the present invention;
The realization flow schematic diagram that Fig. 3 distributes the master control of CCE to handle for the present invention;
Fig. 4 carries out the realization flow schematic diagram that CCE distributes for the present invention to DCIx;
Fig. 5 carries out the realization flow schematic diagram that CCE distributes for the present invention to DCI0;
Fig. 6 is the composition schematic diagram of the distributor of control channel resource of the present invention.
Embodiment
Basic thought of the present invention is: calculating public space CCE and private space CCE, is earlier that the DCI of public space CCE to be allocated distributes CCE, distributes CCE in conjunction with the CCE degree of polymerization that calculates to the DCI that respectively dispatches UE of correspondence again.Then the CCE that dispenses is mapped to PDCCH, and upgrades the use information of CCE.
Need to prove that the use information of CCE comprises: the current user mode of total CCE number, private space CCE number and positional information thereof, public space CCE number and positional information thereof, CCE etc.In order to reduce information overhead, the use information of this CCE also can be: the private space CCE number and the positional information thereof of current residual, the public space CCE number and the positional information thereof of current residual.In addition, this CCE number is meant the number of CCE.
Here, described DCI comprises: DCI form 0, DCI form 1, DCI form 1A, DCI form 1B, DCI form 1C, DCI form 1D, DCI form 2, DCI form 2A, DCI form 3 and DCI form 3A; The DCI of CCE to be allocated is divided into: public DCI, up DCI and descending DCI, wherein, public DCI comprises DCI form 1C, DCI form 3 and DCI form 3A; Up DCI comprises DCI form 0, abbreviates DCI0 as, and this DCI0 is used for the UE uplink authorization; Descending DCI comprises DCI form 1, DCI form 1A, DCI form 1B, DCI form 1C, DCI form 1D, DCI form 2 and DCI form 2A, is referred to as DCIx, and this DCIx is used for the descending distribution of UE.For DCI1, DCI1B, DCI1D, DCI2 and DCI2A, can only distribute private space CCE; For DCI1C, DCI3 and DCI3A, can only distribute public space CCE; For DCI0 and DCI1A, can distribute public space CCE or private space CCE.In addition, relate to three formations in the embodiments of the invention, be respectively: the DCI formation of the DCI formation of public space CCE to be allocated and each scheduling UE, this DCI formation of respectively dispatching UE comprises descending DCI formation and up DCI formation.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.As shown in Figure 1, be the realization flow schematic diagram of the distribution method of CCE of the present invention, concrete treatment step is as follows:
Step 101, public space CCE is calculated in the base station, be the DCI distribution CCE of public space CCE to be allocated, and the CCE after will distributing is mapped to PDCCH;
Wherein, calculate a Transmission Time Interval (TTI according to the concrete configuration situation of cell parameter, Transmission Time Interval) total CCE number in, here, this cell parameter comprises: total resource particle group (REG of control domain among bandwidth of cell, the TTI, Resource Element Group) the OFDM symbolic number of number, control domain and the automatic repetitive requests indicating channel of physical mixed (PHICH, Physical HybridARQ Indicator Channel) are organized number etc.So,, need to calculate total REG number among this TTI for obtaining CCE number total among the TTI.Here, total REG number by bandwidth of cell, Cyclic Prefix (CP, CyclicPrefix), parameters such as the OFDM symbolic number decision of number of transmit antennas and control domain.Wherein, bandwidth of cell is a unit with Resource Block (RB, Resource Block).So, the computational process of total REG number of control domain comprises following four kinds of situations among TTI:
I) the OFDM symbolic number of control domain is 1 o'clock among TTI, has:
Total REG number=2 * bandwidth of cell;
Ii) the OFDM symbolic number of control domain is 2 o'clock among TTI, comprises two kinds of situations:
When 1 of cell configuration or 2 cell reference signals (Cell-specific Reference Signal), total REG number=5 * bandwidth of cell; When 4 cell reference signals of cell configuration, total REG number=4 * bandwidth of cell;
Iii) the OFDM symbolic number of control domain is 3 o'clock among TTI, comprises two kinds of situations:
When 1 of cell configuration or 2 cell reference signals, total REG number=8 * bandwidth of cell; When 4 cell reference signals of cell configuration, total REG number=7 * bandwidth of cell;
Iv) the OFDM symbolic number is 4 o'clock, comprises four kinds of situations:
When 1 of cell configuration or 2 cell reference signals and sub-district CP type are conventional (Normal), total REG number=11 * bandwidth of cell; When 1 of cell configuration or 2 cell reference signals and sub-district CP type during for expansion (Extended), total REG number=10 * bandwidth of cell; When 4 cell reference signals of cell configuration and sub-district CP type are Normal, total REG number=10 * bandwidth of cell; When 4 cell reference signals of cell configuration and sub-district CP type are Extended, total REG number=9 * bandwidth of cell.
In concrete enforcement, according to the parameter configuration situation of reality, calculate total REG number after, calculate CCE number total among the TTI according to following formula (1):
Total CCE number=floor ((total REG number-4-PHICH channel group number * 3)/9) (1)
The 4 REG numbers that take for physics control model indicating channel (PCFICH) in the formula (1).Floor represents to round downwards.
After calculating total CCE number of sub-district, calculate public space CCE number according to following formula (2):
Public space CCE number=min{16, total CCE number } (2)
By formula (2) as can be known, the maximum of this public space CCE number is 16.
Then, the DCI formation of public space CCE to be allocated from scheduler acquisition current TTI takes out DCI successively and carry out the distribution of CCE from the DCI formation of this public space CCE to be allocated, and the CCE after will distributing is mapped to PDCCH.In addition, residue public space CCE number=public space CCE number-occupied public space CCE number.
Calculate after the public space CCE number, obtain the positional information of public space CCE below.Usually, count M according to the total CCE number of PDCCH among the TTI, the CCE degree of polymerization and the PDCCH candidate that DCI uses (L)(Number of PDCCH candidates M (L)) etc. parameter, and calculate the positional information of the CCE that distributes to this DCI by Hash (Hash) function.Information is put in following first place of calculating CCE earlier, and the computing formula of Hash function is:
Y k＝(A×Y k-1)modD (3)
In the formula (3), k represents the subframe numbers of eating dishes without rice or wine of a TTI, and k is integer and 0≤k≤9; Constant A=39827, D=65537.And, when k=0, Y -1=n RNTI≠ 0 wireless network that uses for UE is discerned (RNTI) number temporarily.
Next, according to formula given below (4), come dispensed to give the positional information of the CCE of this DCI:
Figure B2009100855009D0000071
In the formula (4), L represents the CCE degree of polymerization, NCCE, k represent the to eat dishes without rice or wine total CCE number of PDCCH among the subframe k, Y kInformation is put in the first place of the CCE that obtains for the Hash function calculation, and wherein, k gets 0 to 9 integer, and i=0 ..., L-1; M=0 ..., M (L)-1.
By above formula (3), (4) as can be known, can obtain DCI by the Hash function and can use the first place of CCE to put information, the CCE degree of polymerization that this DCI can use, and the PDCCH candidate of the value correspondence of this CCE degree of polymerization count M (L)Determine the positional information and the first relative position information of information of putting of the CCE of its use.And the continuous number of CCE that this DCI uses be that is to say by the value decision of the CCE degree of polymerization, counts M the PDCCH candidate (L)In the candidate region of decision, continuous L CCE by the start position information of CCE begins is the CCE that distributes to this DCI.
For public space CCE, generally adopt CCE degree of polymerization L 4 or 8 to obtain the positional information of distributing required public space CCE, when CCE degree of polymerization L was 4, the start position information of CCE was 0,4,8 or 12; When CCE degree of polymerization L was 8, the start position information of CCE was 0 or 8.Present embodiment adopts 4 values as the degree of polymerization when obtaining the positional information of public space CCE.Following table one is in obtaining the positional information process of public space CCE, the corresponding relation of the CCE degree of polymerization of reference and PDCCH candidate number:
Figure B2009100855009D0000081
Table one
It is emphasized that if the current DCI that does not have public space CCE to be allocated so directly enters next treatment step, promptly calculate the CCE degree of polymerization.
Step 102, the CCE degree of polymerization is calculated in the base station;
Wherein, the described base station calculating CCE degree of polymerization comprises: calculate the up available CCE degree of polymerization and the descending available CCE degree of polymerization.The maximum of this up available CCE degree of polymerization is: distribute to the ratio of the number of the CCE number of up DCI and this up DCI, and round up into gather 1,2,4, the minimum value among the 8}.The maximum of this descending available CCE degree of polymerization is: distribute to the ratio of the number of the CCE number of descending DCI and this descending DCI, and round up into gather 1,2,4, the minimum value among the 8}.Wherein, the described CCE number of distributing to up DCI is: the CCE number that up DCI is occupied in remaining CCE; The described CCE number of distributing to descending DCI is: the CCE number that descending DCI is occupied in remaining CCE.
Here, described remaining CCE is: deduct the resulting CCE of public space CCE that distributes to DCI from total CCE, just, remaining CCE number is that private space CCE number adds remaining public space CCE number.
Calculate remaining CCE number below:
According to calculating total CCE number, public space CCE number, residue public space CCE number and positional information thereof etc. in the step 101, and according to following formula (5):
Private space CCE number=max{0, total CCE number-public space CCE number } (5)
Calculate private space CCE number, when the total CCE in sub-district counts 16 CCE of less than, promptly total CCE number=when public space CCE counted, private space CCE number was 0.
Then, according to the number of the DCI0 of CCE to be allocated from the subframe of eating dishes without rice or wine that scheduler obtains and number and the remaining CCE number of DCIx, determine that uplink and downlink take the ratio x of CCE: y and DCIx and the DCI0 value set of the available CCE degree of polymerization respectively respectively.Wherein, the number of this DCIx comprises the number of DCI2/2A and the number of non-DCI2/2A.So, uplink and downlink take the ratio of CCE, promptly DCI0 and DCIx take the ratio x of CCE: y computational process as shown in Equation (6):
X: y=N 0: (number of the number of 2 * DCI2/2A+non-DCI2/2A) (6)
In the formula (6), N 0Number for DCI0.
So, come dispensed to give the CCE number C of DCIx according to formula given below (7) x, be specially:
Figure B2009100855009D0000091
In the formula (7), M is remaining CCE number, i.e. private space CCE number and residue public space CCE number, x, y are respectively the umber that DCI0 and DCIx take CCE separately.So, obtain distributing to the CCE number C of DCIx x, the CCE number that promptly descending DCI can be assigned to, follow-up is that the number of descending distribution CCE can not surpass C xLike this, further calculate descending available CCE degree of polymerization L x(s): get a variables L x' obtain L x(s) maximum, and calculate L according to following formula (8) x':
Figure B2009100855009D0000092
In the formula (8), N xBe the number of DCIx, i.e. N xThe number of the number of=DCI2/2A+non-DCI2/2A.Here, work as L x'＜8 o'clock, L x' round up into the set 1,2,4, the minimum value among the 8}; Work as L x' 〉=8 o'clock, L x' get 8.For example: L x'=2.5, L x'＜8, L x' round up into the set 1,2,4, the minimum value 4 among the 8}; And for example: L x'=12, L x'＞8, so get L x'=8.And L x(s) value from 1 to L x', i.e. L x(s) be 1 ..., L x'.In addition, when among the DCIx DCI2/2A being arranged, success rate when decoding, the CCE degree of polymerization L that requires DCI2/2A to use in order to improve x(s) minimum value is 2, i.e. L x"=max{2, L x', L x(s) value from 2 to L x", the DCI2/2A CCE degree of polymerization L that can use so x(s) be 2 ..., L x".This is because DCI2/2A requires the transmittability of PDCCH higher, so the minimum value of the CCE number of required distribution is 2.And other DCI does not then have specific (special) requirements to the transmittability of PDCCH.Provided the corresponding relation of the bit number that CCE number and PDCCH can transmit below, as shown in Table 2:
The CCE number The bit number that PDCCH can transmit
1 72
2 144
4 288
8 576
Table two
Calculate up available CCE degree of polymerization L below 0(s):
The ratio x that DCI0 that calculates by above-mentioned formula (6) and DCIx take CCE: after the y,, calculate the CCE number C that distributes to DCI0 according to following formula (9) 0For:
Figure B2009100855009D0000101
In the formula (9), M is remaining CCE number, i.e. private space CCE number and residue public space CCE number, x, y are respectively the umber that DCI0 and DCIx take CCE separately.So, obtain distributing to the CCE number C of DCI0 0, the CCE number that promptly up DCI can be assigned to, follow-up is that the number of uplink assignment CCE can not surpass C 0Get a variables L below 0' obtain L 0(s) maximum, and calculate L according to following formula (10) 0':
Figure B2009100855009D0000102
In the formula (10), N 0Number for DCI0.Here, work as L 0'＜8 o'clock, L 0' round up into the set 1,2,4, the minimum value among the 8}; Work as L 0' 〉=8 o'clock, L 0' get 8.For example: L x'=2.5, L x'＜8, L x' round up into the set 1,2,4, the minimum value 4 among the 8}; And for example: L x'=12, L x'＞8, so get L x'=8.In addition, if earlier DCIx is carried out the allocation process of CCE,, require up available CCE degree of polymerization L so in order to improve the power that is distributed into of CCE 0(s) can not have only a value 1, so make L 0"=max{2, L 0', L 0(s) value from 1 to L 0", i.e. L 0(s) be: 1 ..., L 0".So, make L 0(s) comprise two values 1 and 2 at least.Similarly, if when earlier DCI0 being carried out the allocation process of CCE, then needn't be to L 0(s) do this qualification, and should be to L x(s) do this qualification, even earlier DCI0 is distributed CCE, then require descending available CCE degree of polymerization L x(s) comprise two values 1 and 2 at least.
Step 103, base station are taken out the value of the CCE degree of polymerization and are come the required CCE of dispensed, distribute CCE to the DCI of each scheduling UE, and the CCE that dispenses is mapped to PDCCH.
About obtaining the CCE that distributes to the DCI of each scheduling UE, mainly be that the total CCE number according to PDCCH among the TTI, the CCE degree of polymerization and the PDCCH candidate that this DCI uses count M (L)Etc. parameter, and calculate the positional information of CCE according to formula (3), (4).Concrete processing procedure mainly comprises following two kinds of situations:
I, DCIx carried out the allocation process of CCE:
According to the CCE number of distributing to DCIx that calculates in the step 102 and descending available CCE degree of polymerization L x(s) set of value by ascending value successively from the value set of this CCE degree of polymerization, and comes Hash to distribute to the CCE of this DCIx by the Hash function, and the value that successfully is assigned to CCE or this CCE degree of polymerization up to this DCIx is got time.Then, the CCE that distributes to this DCIx is mapped to PDCCH.Wherein, dispensed is for the formula of the CCE of DCIx:
By formula (3), (4) as can be known, after information was put in the first place that gets access to CCE, the PDCCH candidate that this DCI uses counted M (L)Determine the positional information and the first relative position information of information of putting of the CCE of its use, the CCE number that this DCI uses be that is to say by the value decision of the CCE degree of polymerization, counts M the PDCCH candidate (L)In the candidate region of decision, continuous L CCE by the start position information of CCE begins is the CCE that distributes to this DCI.Wherein, L calculates the value of the CCE degree of polymerization of being taked for this.
For private space CCE, the corresponding relation of the PDCCH candidate number and the CCE degree of polymerization as shown in Table 3:
Figure B2009100855009D0000111
Table three
II, DCI0 carried out the allocation process of CCE:
According to the CCE number of distributing to DCI0 that calculates in the step 102 and up available CCE degree of polymerization L 0(s) value set, the positional information by the Hash function comes Hash CCE for this DCI0 distributes CCE, and is mapped to PDCCH to the CCE that distributes to this DCI0.Wherein, similar with DCIx when dispensed is given the CCE positional information of DCI0, all adopt formula (3), (4), according to the value of the different polymerization of being taken out and the pairing candidate's number of value of this degree of polymerization etc., calculate the positional information of CCE.
Need to prove, DCIx and DCI0 carry out in the allocation process process of CCE, in operation, there is no the qualification of sequencing, for example: when the CCE that DCIx is used carries out allocation process earlier, so according to remaining private space CCE number, public space CCE number and positional information thereof after the allocation process of DCIx being carried out CCE, the allocation process of coming DCI0 is carried out CCE again.But,, require up available CCE degree of polymerization L so if earlier DCIx is carried out the allocation process of CCE 0(s) be at least 1,2}.Therefore, when the CCE that calculates when the value by the CCE degree of polymerization of once taking out is occupied, can from this value set, takes out the value of another degree of polymerization once more successively and come the required CCE of dispensed.
Further specify below in the said method step 101, the DCI of public space CCE to be allocated is distributed the implementation procedure of CCE respectively.As shown in Figure 2, be the allocation flow schematic diagram of public space CCE of the present invention, concrete steps are as follows:
Step 201, the total CCE number of public space CCE allocation units calculation plot in the base station;
Here, according to above-mentioned formula (1), calculate and obtain the total CCE number in sub-district.
Step 202, described public space CCE allocation units are calculated public space CCE number;
Wherein, according to formula (2), calculate public space CCE number.
Step 203, whether described public space CCE allocation units judge public space CCE number greater than 4, if greater than 4, then execution in step 204; If be not more than 4, then execution in step 208;
When the DCI of public space CCE to be allocated, whether public space CCE allocation units exist continuous 4 public space CCE number., public space CCE number being judged boundary with 4 herein, is in order to save the expense of public space CCE, residue public space CCE to be distributed to the DCI of CCE to be allocated.
Step 204, described public space CCE allocation units take out a DCI successively from the DCI formation of public space CCE to be allocated;
Step 205, described public space CCE allocation units are selected 4 values as the CCE degree of polymerization, distribute CCE for the DCI that is taken out, and are mapped to PDCCH by the CCE that the mapping processing unit will be distributed to this DCI;
Here, for saving the expense of public space CCE, getting the CCE degree of polymerization is 4, and the public space CCE that will save can distribute to the DCI that respectively dispatches UE, to improve the utilance of CCE.Wherein, the positional information that described public space CCE allocation units will be distributed to the CCE of this DCI sends to the mapping processing unit, and this mapping processing unit is mapped to the processing of PDCCH to the CCE that distributes to this DCIx.
Step 206, described public space CCE allocation units upgrade the use information of remaining public space CCE;
Wherein, the use information of this remaining public space CCE comprises: information such as the number of residue public space CCE and positional information thereof.Described renewal is operating as: the user mode of occupied CCE is revised as seizure condition, and calculates remaining CCE number.
Step 207, described public space CCE allocation units judge that whether this DCI is last in the DCI formation at its place, if last, then execution in step 208; If not last, then return execution in step 203;
Step 208, described public space CCE allocation units total CCE number of sub-district, public space CCE number, residue public space CCE number with and positional information send to the CCE main control unit.
Next, be described further in conjunction with the step 102 to said method, wherein, the master control process for CCE is distributed to DCI in the base station as shown in Figure 3, is the realization flow schematic diagram that the present invention distributes the master control of CCE to handle, and concrete steps are as follows:
Step 301, CCE main control unit receive total CCE number, public space CCE number, residue public space CCE number and the positional information thereof that public space CCE allocation units send;
Step 302, the number of DCIx to be scheduled and the number of DCI0 in the subframe of eating dishes without rice or wine that CCE main control unit receiving scheduling device sends;
Wherein, this DCIx comprises: DCI2/2A and non-DCI2/2A.
Step 303, the private space CCE number of CCE main control unit calculation plot;
Wherein, the CCE main control unit calculates the private space CCE number of sub-district according to described formula (5).
Step 304, CCE main control unit calculating DCIx and DCI0 take the ratio x of CCE: y;
Wherein, the CCE main control unit calculates the ratio x that DCIx and DCI0 take CCE: y according to the number of DCIx to be scheduled in the subframe of eating dishes without rice or wine, number and the formula (6) of DCI0.
Step 305, CCE main control unit are calculated descending available CCE degree of polymerization L x(s) value set, and send to descending CCE distribution subelement;
Wherein, the CCE main control unit takies the umber of CCE respectively according to residue CCE number and DCIx and DCI0, comes dispensed to give the CCE number of DCIx according to formula (7), and according to the CCE number of giving this DCIx distribution that calculates, according to formula (8), calculate descending available CCE degree of polymerization L x(s) value set.
Step 306, CCE main control unit are calculated up available CCE degree of polymerization L 0(s) value set, and send to up CCE distribution subelement;
Wherein, the CCE main control unit takies the umber of CCE respectively according to residue CCE number and DCIx and DCI0, come first dispensed to give the CCE number of DCI0 according to formula (9), and take the umber of CCE and give the CCE number of this DCI0 distribution according to DCI0, according to formula (10), calculate up available CCE degree of polymerization L 0(s) value set.
Step 307, CCE main control unit send to descending CCE with remaining CCE, the information such as CCE number of distributing to DCIx respectively and distribute subelement.
Here because DCI comprises DCIx and DCI0 two big classes, so below further specify step 103 in the said method, promptly respectively to the processing procedure of DCIx and the DCI0 distribution CCE of each scheduling UE.In addition, though the present invention distributes the operation of CCE to there is no the qualification of sequencing to DCIx and DCI0, be that description is clear, so sentencing elder generation is example to the allocation process that DCIx carries out CCE, as shown in Figure 4, for the present invention carries out the realization flow schematic diagram that CCE distributes to DCIx, concrete steps are as follows:
Step 401, private space CCE number, residue public space CCE number and positional information thereof that descending CCE distributes subelement reception CCE main control unit to send, and descending available CCE degree of polymerization L x(s) value set;
Step 402, descending CCE distributes subelement to take out a DCIx successively from descending DCI formation;
According to the prioritization of respectively dispatching UE in the concrete descending DCI formation, take out DCIx from high to low successively.
Step 403, descending CCE distributes subelement to judge whether this DCIx is DCI2/2A, and if not DCI2/2A, then execution in step 404; If DCI2/2A, then execution in step 405;
Step 404, the CCE degree of polymerization L that descending CCE distributes subelement can use from the DCIx that is taken out x(s) in, take out a value from small to large successively by 1 beginning, execution in step 406 then;
Step 405, the CCE degree of polymerization L that descending CCE distributes subelement can use from the DCIx that is taken out x(s) in, take out a value from small to large successively by 2 beginnings;
Step 406, descending CCE distributes subelement to judge that can the value of the degree of polymerization of being taken out become distribution of work CCE for this DCIx, if can become the distribution of work, then execution in step 407; If can not become the distribution of work, then execution in step 410;
Wherein, according to the value of the degree of polymerization of being taken out,, come dispensed to give the CCE of this DCIx according to formula (3), (4) etc.And, judge according to the use information of current C CE whether the CCE that calculates is occupied, if unoccupied, then expression can become the distribution of work; If occupied, then expression can not become the distribution of work.Further, if the CCE that calculates is occupied, can judge whether idle CCE according to the PDCCH candidate parameter so, if idle CCE is arranged, CCE that then should the free time distributes to this DCIx; If there is not idle CCE, then execution in step 410.
Step 407, descending CCE distributes subelement that the CCE that calculates is distributed to this DCIx, and is mapped to PDCCH by the CCE that the mapping processing unit will be distributed to this DCIx, and execution in step 408 then;
Wherein, the positional information that descending CCE distributes subelement will distribute to the CCE of this DCIx sends to the mapping processing unit, and this mapping processing unit is mapped to the processing of PDCCH to the CCE that distributes to this DCIx.
Step 408, descending CCE distributes subelement to judge whether the CCE that distributes to this DCIx is public space CCE, and if not public space CCE, then execution in step 409; If public space CCE, then execution in step 414;
Step 409, descending CCE distributes subelement to upgrade the use information of residue downlink dedicated space CCE, and execution in step 415 then;
Step 410, descending CCE distributes subelement to judge whether the value of this degree of polymerization is CCE degree of polymerization L x(s) last value in is if then execution in step 411; If not last value, then return execution in step 405;
Step 411, descending CCE distributes subelement to judge that can this DCIx distribute with public space CCE, if can be assigned to public space CCE, then execution in step 412; If can not be assigned to public space CCE, then execution in step 416;
Here, got all over the back also unallocatedly during to CCE when the value of the degree of polymerization of this DCIx, if this DCIx can take public space CCE, the value that then adopts the distribution method of public space CCE promptly to get the CCE degree of polymerization is 4, is retrieved as the CCE of this DCIx distribution.Wherein, the DCIx that can take public space CCE is DCI1A.
Step 412, descending CCE distributes subelement to judge whether that enough idle descending public space CCE distribute to this DCIx, if enough idle descending public space CCE are arranged, then execution in step 413; If there are not enough idle descending public space CCE, then execution in step 416;
Step 413, descending CCE distributes the descending public space CCE that subelement should the free time to distribute to this DCIx, and is mapped to PDCCH by the CCE that the mapping processing unit will be distributed to this DCIx, and execution in step 414 then;
Wherein, the positional information that descending CCE distributes subelement will distribute to the CCE of this DCIx sends to the mapping processing unit, and this mapping processing unit is mapped to the processing of PDCCH to the CCE that distributes to this DCIx.
Step 414, descending CCE distributes subelement to upgrade the use information of the descending public space CCE of residue, and execution in step 415 then;
Step 415, descending CCE distributes subelement to judge the current remaining descending CCE that whether also has, if having, then execution in step 416; If no, execution in step 417 then;
Wherein, judge currently whether also have remaining descending CCE to comprise: judge whether the current CCE number of distributing to descending DCI surpasses the CCE number that descending DCI can be assigned to, if do not surpass the CCE number that descending DCI can be assigned to, then judge the current remaining CCE that whether also has; If surpass the CCE number that descending DCI can be assigned to, then finish the allocation flow of this CCE.
Perhaps, judge earlier currently whether also have remaining CCE,, then judge the CCE the number whether current CCE number of distributing to descending DCI can be assigned to above descending DCI if remaining CCE is arranged; If no, then finish the allocation flow of this CCE.
Therefore, the current CCE number that remaining CCE is arranged and distribute to descending DCI surpasses CCE that descending DCI can be assigned to when counting, and for also having remaining descending CCE, then execution in step 416.
Step 416, descending CCE distributes subelement to judge whether this DCIx is in this descending DCI formation last, if last, then execution in step 417; If not last, then return execution in step 402;
Step 417, descending CCE distributes subelement to distribute subelement to send the use information of the CCE after upgrading for up CCE.
Wherein, the use information of the CCE after this renewal comprises: residue private space CCE number and positional information, residue public space CCE number and positional information thereof etc.
After the CCE allocation process of finishing DCIx, begin that DCI0 is carried out CCE and distribute.As shown in Figure 5, for the present invention carries out the realization flow schematic diagram that CCE distributes to DCI0, concrete steps are as follows:
Step 501, up CCE distributes subelement to receive the up available CCE degree of polymerization L that the CCE main control unit sends 0(s) value set;
Step 502, the use information of the CCE after its renewal that the up descending CCE distribution subelement of CCE distribution subelement reception sends;
The use information of CCE after this renewal comprises: residue private space CCE number and positional information, residue public space CCE number and positional information thereof etc.
Step 503, up CCE distributes subelement to take out a DCI0 successively from up DCI formation;
Here, according to the prioritization the up DCI formation of obtaining, take out DCI0 from high to low successively from scheduler.
Step 504, the CCE degree of polymerization L that up CCE distributes subelement can use at the DCI0 that is taken out 0(s) in, take out the value of a degree of polymerization from small to large successively;
Step 505, up CCE distributes subelement to judge that can the value of this degree of polymerization become distribution of work CCE for this DCI0, if can become the distribution of work, then execution in step 506; If can not become the distribution of work, then execution in step 509;
Wherein, according to the value of the degree of polymerization of being taken out,, come dispensed to give the CCE of this DCI0 according to formula (3), (4) etc.And, judge according to the use information of current C CE whether the CCE that calculates is occupied, if unoccupied, then expression can become the distribution of work; If occupied, then expression can not become the distribution of work.Further, if the CCE that calculates is occupied, can judge whether idle CCE according to the PDCCH candidate parameter so, if idle CCE is arranged, CCE that then should the free time distributes to this DCI0; If there is not idle CCE, then execution in step 509.
Step 506, up CCE distributes subelement that the CCE that calculates is distributed to this DCI0, and is mapped to PDCCH by the CCE that the mapping processing unit will be distributed to this DCI0, and execution in step 507 then;
Wherein, the positional information that up CCE distributes subelement will distribute to the CCE of this DCI0 sends to the mapping processing unit, and this mapping processing unit is mapped to the processing of PDCCH to the CCE that distributes to this DCI0.
Step 507, up CCE distributes subelement to judge whether the CCE that distributes to this DCI0 is public space CCE, and if not public space CCE, then execution in step 508; If public space CCE, then execution in step 512;
Step 508, up CCE distributes subelement to upgrade the use information of the up private space CCE of residue;
Step 509, up CCE distributes subelement to judge whether the value of the degree of polymerization of being taken out in this assigning process is CCE degree of polymerization L 0(s) last value in, if last value, then execution in step 510; If not last value, then return execution in step 504;
Here, got all over the back also unallocatedly during to CCE when the value of the degree of polymerization of this DCI0, if this DCI0 can take public space CCE, the value that then adopts the distribution method of public space CCE promptly to get the CCE degree of polymerization is 4, is retrieved as the CCE of this DCI0 distribution.
Step 510, up CCE distributes subelement to judge whether that enough idle up public space CCE distribute, if enough idle up public space CCE are arranged, then execution in step 511; If there are not enough idle up public space CCE, then execution in step 514;
Step 511, up CCE distributes the up public space CCE that subelement should the free time to distribute to this DCI0, and is mapped to PDCCH by the CCE that the mapping processing unit will be distributed to this DCI0, and execution in step 512 then;
Wherein, the positional information that up CCE distributes subelement will distribute to the CCE of this DCI0 sends to the mapping processing unit, and this mapping processing unit is mapped to the processing of PDCCH to the CCE that distributes to this DCI0.
Step 512, up CCE distributes subelement to upgrade the use information of the up public space CCE of residue;
Step 513, up CCE distributes subelement to judge currently whether to remain up CCE in addition, if remain up CCE in addition, then execution in step 514; If do not remain up CCE, then finish this distributes CCE to DCI0 flow process;
Wherein, judge currently whether remain up CCE in addition and comprise: judge that whether the current CCE number of distributing to up DCI surpasses the CCE number that up DCI can be assigned to, if surpass the CCE number that up DCI can be assigned to, then judges the current remaining CCE that whether also has; If surpass the CCE number that up DCI can be assigned to, then finish the allocation flow of this CCE.
Perhaps, judge earlier currently whether also have remaining CCE,, then judge the CCE the number whether current CCE number of distributing to up DCI can be assigned to above up DCI if remaining CCE is arranged; If no, then finish the allocation flow of this CCE.
Therefore, the current CCE number that remaining CCE is arranged and distribute to up DCI surpasses CCE that up DCI can be assigned to when counting, and for also having remaining up CCE, then execution in step 514.
Step 514, up CCE distributes subelement to judge that whether this DCI0 is in the up DCI formation last, if not last, then returns execution in step 503; If last then finishes this distributes CCE to DCI0 flow process.
Above-mentioned is the main realization flow of the distribution method of CCE of the present invention, below in conjunction with specific embodiment, further specifies said method.
Instantiation one:
In the present embodiment, make the Cyclic Prefix (Cyclic Prefix) of Frequency Division Duplexing (FDD) (FDD) standard sub-district be configured to Normal, bandwidth is 20MHz, adopts 2 transmitting antenna ports, PDCCH to take 3 OFDM (OFDM, Orthogonal Frequency Division Multiplexing) symbol, PHICH group number are 3,3 UE are arranged in the sub-district, be respectively UE0, UE1 and UE2, the cell-radio network of this UE0, UE1 and UE2 is discerned (C-RNTI) temporarily and number is respectively 60,82 and 109.In the subframe 2 of eating dishes without rice or wine, DCI0 and the DCI 0 of DCI1, UE1 and DCI0 and the DCI1A CCE to be allocated of DCI2 and UE2 of DCI1C, a UE0 arranged.In the present embodiment,, distribute the order of up DCI to carry out the distribution of CCE at last according to distributing public DCI, next allocation of downlink DCI earlier.
Steps A 1, CCE number that public space CCE allocation units calculation plot is total and public space CCE number, and to the DCI of public space CCE to be allocated distribution CCE;
It is 87 that this public space CCE allocation units calculate the total CCE number in sub-district according to formula (1), and the public space CCE number that draws the sub-district according to formula (2) is 16 again, is respectively CCE0～CCE15.And, in the process of distributing public space CCE, according to the CCE degree of polymerization is 4 to distribute 4 public space CCE to DCI1C, be respectively CCE0～CCE3, and the positional information of these 4 the public space CCE that dispense sent to the mapping processing unit, this mapping processing unit is mapped to the processing of PDCCH to these 4 CCE, and upgrades the use information of public space CCE.
In addition, this public space CCE allocation units also can send to the CCE main control unit with the use information of CCE, herein, the use information of this CCE comprises: the total CCE in sub-district is several 87, public space CCE is several 16, remaining public space CCE several 12 and positional information thereof etc., wherein, the positional information of this remaining public space CCE is represented with CCE4～CCE15.
Steps A 2, CCE main control unit are calculated private space CCE number, the descending and up available CCE degree of polymerization;
After this CCE main control unit received the use information of the described CCE that described public space CCE allocation units provide, calculate according to formula (5): private space CCE number was 71, represents with CCE16～CCE86 respectively.
In addition, this CCE main control unit gets access to from scheduler: the subframe of eating dishes without rice or wine 2 has 3 DCIx and 3 DCI0 CCE to be allocated, and wherein, these 3 DCIx comprise 1 DCI2 and 2 non-DCI2/2A., calculate the ratio that uplink and downlink take CCE according to formula (6) herein, promptly DCI0 and DCIx take the ratio x of CCE: y=3: (1 * 2+2)=3: 4.According to formula (7), calculate so, distribute to descending DCI, be that the number of the CCE of DCIx is: ceil ((71+12) * 4/ (3+4))=48, so, have: L according to formula (8) x'=ceil (48/3)=16, i.e. L x'＞8, so get L x'=8, and L x'＞2, therefore, obtain the CCE degree of polymerization L that DCI2 can use x(s) be: 2,4,8}, the CCE degree of polymerization L that non-DCI2/2A can use x(s) be: 1,2,4,8}.
In addition, according to formula (9), calculating and distributing to up DCI is that the number of the CCE of DCI0 is: floor ((71+12) * 3/ (3+4))=35 according to formula (10), has: L so 0'=ceil (35/3)=12, L 0'＞8, so get L 0'=8, therefore, descending available CCE degree of polymerization L 0(s) be: 1,2,4,8}.In the above-mentioned formula, ceil represents to round up.
Need to prove, present embodiment with earlier to descending DCI, be the allocation process that DCIx carries out CCE, then to up DCI, be the allocation process that DCI0 carries out CCE.Therefore, this CCE main control unit can be positional information and the descending available CCE degree of polymerization L of the CCE number of distributing to DCIx, residue public space CCE x(s) send to descending CCE and distribute subelement.And this CCE main control unit can be up available CCE degree of polymerization L 0(s) send to up CCE and distribute subelement.
Steps A 3: descending CCE distributes subelement DCIx to be carried out the allocation process of CCE;
Descending CCE distribution subelement receives the CCE number of distributing to DCIx, residue public space CCE positional information and the descending available CCE degree of polymerization L that described CCE main control unit sends x(s) etc. after the information, from descending DCI formation, take out a DCIx successively, and be that the DCIx that is taken out distributes CCE.In the present embodiment, make the priority in the descending DCI formation of respectively dispatching UE be followed successively by from high to low: UE0, UE1 and UE2.
Therefore, the DCI1 for UE0 distributes CCE earlier: because DCI1 is not DCI2/2A, so the CCE degree of polymerization L that DCI1 can use x(s) earlier since 1 value, calculating the required CCE of distribution according to formula (3), (4) is CCE54, CCE54 is unoccupied as can be known according to the use information of current CCE, so CCE54 is distributed to the DCI1 of UE0, and CCE54 sent to the mapping processing unit, this mapping processing unit is mapped to PDCCH with this CCE54, and upgrades the use information of CCE.
Then, the DCI2 to UE1 distributes CCE: the CCE degree of polymerization L that this moment, DCI2 can use x(s) since 2 values.In like manner, the CCE that is obtained by the Hash function calculation is CCE2 and CCE3, and CCE2 and CCE3 are occupied as can be known but use information according to current CCE.And the PDCCH candidate counts M (2)CCE4 and CCE5 in the corresponding candidate region are unoccupied, so CCE4 and CCE5 are distributed to the DCI2 of UE1, this descending CCE distributes subelement that CCE4 and CCE5 are sent to the mapping processing unit.This mapping processing unit carries out the processing that CCE is mapped to PDCCH to CCE4 and CCE5, and upgrades the use information of CCE.
Then, distribute CCE to the DCI1A of UE2: because DCI1A is non-DCI2/2A, so the CCE degree of polymerization is calculated CCE since 1 value.In like manner, obtaining distributing required CCE by the Hash function calculation is CCE83, and CCE83 is unoccupied as can be known according to the use information of current CCE, thus CCE83 is distributed to the DCI1A of UE2, and CCE83 is sent to the mapping processing unit.This mapping processing unit carries out the processing that CCE is mapped to PDCCH to CCE83, and upgrades the use information of CCE.
Then, judge whether the DCIx in the descending DCI formation has all finished the operation that distributes CCE, if do not finish the operation that distributes CCE, then return the DCIx that extracts CCE to be allocated in the descending DCI formation successively, for it distributes CCE; If all finished the operation that distributes CCE, then this descending CCE distributes subelement to distribute subelement to send the use information of the CCE after upgrading to up CCE, the use information of CCE after this renewal comprises residue private space CCE, the number that remains public space CCE and positional information etc., specifically have: residue private space CCE number is 69, CCE54 and CCE83 are occupied, residue public space CCE number is 10, and CCE0～CCE3, CCE4, CCE5 are occupied.
Steps A 4, up CCE distributes subelement DCI0 to be carried out the allocation process of CCE.
Wherein, up CCE distributes subelement to receive the up available CCE degree of polymerization L that described CCE main control unit sends 0(s) and the CCE of described descending CCE after distributing subelement to send it to upgrade use information.Then, from the up DCI formation of each scheduling UE, take out a DCI0 successively, and be this DCI0 distribution CCE.In the present embodiment, make the priority in the up DCI formation of respectively dispatching UE be followed successively by from high to low: UE1, UE2 and UE0.
Therefore, the DCI0 that earlier is UE1 distributes the CCE:CCE degree of polymerization since 1 value, calculating the required CCE of distribution by the Hash function is CCE26, according to the use information of current CCE as can be known: CCE26 is unoccupied, so CCE26 is distributed to the DCI0 of UE1, and CCE26 sent to the mapping processing unit, so that CCE26 is carried out the processing that CCE is mapped to PDCCH, upgrade the use information of CCE then.
The DCI0 that is UE2 again distributes CCE: in like manner, the CCE degree of polymerization that is adopted is since 1 value, and calculating the required CCE of distribution by the Hash function is CCE83, but according to the use information of current CCE as can be known: CCE83 is occupied, and the PDCCH candidate counts M (1)In CCE84 unoccupied, so CCE84 is distributed to the DCI0 of UE2, CCE84 is sent to the mapping processing unit carries out the processing that CCE is mapped to PDCCH, upgrade the use information of CCE.
Then, be that the DCI0 of UE0 distributes CCE: in like manner, the CCE degree of polymerization that is adopted is since 1 value, and calculating the required CCE of distribution by the Hash function is CCE54, but according to the use information of current CCE as can be known: CCE54 is occupied, and the PDCCH candidate counts M (1)In CCE55 unoccupied, so CCE55 is distributed to the DCI0 of UE0, and CCE55 is sent to the mapping processing unit, CCE55 is carried out the processing that CCE is mapped to PDCCH, upgrade the use information of CCE then.
Then, judge whether the DCI0 that respectively dispatches UE in the up DCI formation finishes the batch operation of CCE,, then return the DCI0 that takes out CCE to be allocated in this up DCI formation successively, carry out CCE and distribute if be still waiting to distribute the DCI0 of CCE; If there is not the DCI0 of CCE to be allocated, then the DCI in this subframe 2 of eating dishes without rice or wine finishes the distribution of CCE.
Behind the above-mentioned instantiation one of explanation, below according to earlier be public DCI distribute CCE, again for up DCI distributes CCE, be the order of descending DCI distribution CCE then, further specify the distribution method of CCE of the present invention by instantiation two.
Instantiation two:
In the present embodiment, to make the Cyclic Prefix of FDD standard sub-district be configured to Normal, bandwidth be 10MHz, adopt 4 transmitting antenna ports, PDCCH to take 3 OFDM symbols, PHICH group number is 3,8 UE are arranged in the sub-district, be respectively UE0～UE7, be respectively 61～63,75～76,99 and 104～105 its C-RNTI number, in the subframe 5 of eating dishes without rice or wine, the DCI1 CCE to be allocated of DCI0, the UE7 of the DCI0 of DCI2A, UE5 of DCI1, UE4 of DCI0, UE2 of the DCI0 of 2 DCI1C, UE0 and DCI2, UE1 and DCI2, UE6 is arranged.
Step B1, CCE number that public space CCE allocation units calculation plot is total and public space CCE number, and distribute CCE respectively to the DCI of public space CCE to be allocated;
It is 37 that public space CCE allocation units calculate the total CCE number in sub-district according to formula (1), and then is 16 according to the public space CCE number that formula (2) draws the sub-district, is respectively CCE0～CCE15.And, in the process of distributing public space CCE, be 4 to distribute 4 public space CCE for first DCI1C according to the CCE degree of polymerization, be respectively CCE0～CCE3.These 4 the public space CCE that dispense are sent to the mapping processing unit, carrying out the processing that CCE0～CCE3 is mapped to PDCCH, and upgrade the use information of public space CCE.Then, be 4 to distribute 4 public space CCE for second DCI1C according to the CCE degree of polymerization, be respectively CCE4～CCE7.These 4 the public space CCE that dispense are sent to the mapping processing unit, carrying out the processing that CCE4～CCE7 is mapped to PDCCH, and upgrade the use information of CCE.
In addition, this public space CCE allocation units also can send to the CCE main control unit to the use information of CCE, herein, the use information of this CCE comprises: the total CCE in sub-district is several 37, public space CCE is several 16, remaining public space CCE several 8 and positional information thereof, wherein, the positional information of this remaining public space CCE number is represented with CCE8～CCE15.
Step B2, CCE main control unit calculate private space CCE number, the descending and up available CCE degree of polymerization;
This CCE main control unit receives that the total CCE in sub-district that described public space CCE allocation units send is several 37, public space CCE is several 16, remaining public space CCE several 8 and positional information thereof, wherein, this remaining public space CCE positional information is represented with CCE8～CCE15.Then, calculating private space CCE number according to formula (5) is 21, represents with CCE16～CCE36 respectively.
In addition, this CCE main control unit gets access to from scheduler: the subframe of eating dishes without rice or wine 5,5 DCIx and 4 DCI0 CCE to be allocated are arranged, wherein, these 5 DCIx comprise 3 DCI2 and 2 non-DCI2/2A.Here, calculate according to formula (6): DCI0 and DCIx take the ratio x of CCE: y=4: (3 * 2+2)=1: 2.So, the CCE number of distributing to descending DCI and be DCIx is: ceil ((21+8) * 2/ (1+2))=20, so, have: L according to formula (8) x'=ceil (20/5)=4, and L x'＞2.Therefore, obtain the CCE degree of polymerization L that DCI2 can use x(s) be: 2,4}, the CCE degree of polymerization L that non-DCI2/2A can use x(s) be: 1,2,4}.
In addition, distribute to up DCI, be that the CCE number of DCI0 is: floor ((21+8) * 1/ (1+2))=9 according to formula (10), has: L so 0'=ceil (9/4)=3 gets L 0'=4, therefore obtain up available CCE degree of polymerization L 0(s) be: 1,2,4}.
Need to prove that present embodiment carries out the allocation process of CCE earlier to DCI0 after distributing CCE for public DCI, then DCIx is carried out the allocation process of CCE.Therefore, this CCE main control unit can be the use information of the CCE number of distributing to DCI0, CCE and up available CCE degree of polymerization L 0(s) etc. information sends to up CCE and distributes subelement, and descending available CCE degree of polymerization L x(s) send to descending CCE and distribute subelement.The use information of this CCE comprises: total CCE number, residue public space CCE number and positional information thereof etc.
Step B3, up CCE distribute subelement DCI0 to be carried out the allocation process of CCE.
The CCE number of distributing to DCI0, residue public space CCE positional information and up available CCE degree of polymerization L that this up CCE distributes subelement reception CCE main control unit to send 0(s) etc. after the information, from up DCI formation, take out a DCI0 successively, and be that the DCI0 that is taken out distributes CCE.In the present embodiment, the priority that the up DCI formation of UE is respectively dispatched in order is respectively UE6, UE5, UE0 and UE1 from high to low, so, have:
A) be that the DCI0 of UE6 distributes the CCE:CCE degree of polymerization since 1 value, the CCE that is calculated by the Hash function is CCE34, and according to the use information of current CCE as can be known: CCE34 is unoccupied, so distribution CCE34 is to the DCI0 of UE6.Then, CCE34 is sent to the mapping processing unit carry out the processing that CCE34 is mapped to PDCCH, and upgrade the use information of CCE;
B) be that the DCI0 of UE5 distributes the CCE:CCE degree of polymerization since 1 value, the CCE that is calculated by the Hash function is CCE29, and according to the use information of current CCE as can be known: CCE29 is unoccupied, so CCE29 is distributed to the DCI0 of UE5.Then, CCE29 is sent to the mapping processing unit carry out the processing that CCE29 is mapped to PDCCH, and upgrade the use information of CCE;
C) be that the DCI0 of UE0 distributes the CCE:CCE degree of polymerization since 1 value, the CCE that is calculated by the Hash function is CCE2, and according to the use information of current CCE as can be known: CCE2 is occupied, and the PDCCH candidate counts M (1)In CCE also all occupied.So this up available CCE degree of polymerization gets 2, the CCE that is calculated by the Hash function is CCE24 and CCE25, and according to the use information of current CCE as can be known: CCE24 and CCE25 are unoccupied, so CCE24 and CCE25 are distributed to the DCI0 of UE0.Then, CCE24 and CCE25 sent to the mapping processing unit carries out CCE24 and CCE25 is mapped to the processing of PDCCH, and upgrade the use information of CCE.
D) be that the DCI0 of UE1 distributes the CCE:CCE degree of polymerization since 1 value, the CCE that is calculated by the Hash function is CCE5, and according to the use information of current CCE as can be known: CCE5 is occupied, and the PDCCH candidate counts M (1)In CCE8 unoccupied, so CCE8 is distributed to the DCI0 of UE1.Then, CCE8 is sent to the mapping processing unit carry out the processing that CCE8 is mapped to PDCCH, and upgrade the use information of CCE.
Then, judge whether the DCI0 that respectively dispatches UE in the up DCI formation finishes batch operation,, then return the DCI0 that takes out CCE to be allocated in this up DCI formation successively, carry out CCE and distribute if be still waiting to distribute the DCI0 of CCE; If all finished the operation that up DCI distributes CCE, then up CCE distributes subelement to distribute subelement to send the use information of the CCE after upgrading to descending CCE.Herein, the use information of CCE after this renewal comprises residue private space CCE number, residue public space CCE number and positional information, specifically comprise: residue private space CCE number is 17, CCE24～CCE25, CCE29 and CCE34 are occupied, residue public space CCE number is 7, and CCE0～CCE8 is occupied.
Step B4, descending CCE distribute subelement DCIx to be carried out the allocation process of CCE;
Wherein, descending CCE distributes subelement to receive the descending available CCE degree of polymerization L that described CCE main control unit sends x(s) after the CCE use information after information, described up CCE distribute subelement to send it to upgrade, carry out CCE to descending DCI of each scheduling UE successively and distribute.In the present embodiment, make the priority in the descending DCI formation of respectively dispatching UE be followed successively by from high to low: UE2, UE5, UE4, UE7 and UE0, so, have:
A) DCI1 for UE2 distributes CCE: because DCI1 is not DCI2/2A, so the CCE degree of polymerization L that DCI1 can use x(s) earlier since 1 value, calculating the required CCE of distribution by the Hash function is CCE8, and according to the use information of current CCE as can be known: CCE8 is occupied, and the PDCCH candidate counts M (1)In CCE9 unoccupied, so CCE9 is distributed to the DCI1 of UE2.Then, CCE9 is sent to the mapping processing unit, carrying out the processing that CCE9 is mapped to PDCCH, and upgrade the use information of CCE;
B) distribute CCE for the DCI2 of UE5: adopting the CCE degree of polymerization earlier is 2 to distribute, and the CCE that is calculated by the Hash function is, according to the use information of current CCE as can be known: CCE16 and CCE17 are unoccupied, so CCE16 and CCE17 are distributed to the DCI2 of UE5.Then, CCE16 and CCE17 sent to the mapping processing unit carries out CCE16 and CCE17 is mapped to the processing of PDCCH, and upgrade the use information of CCE;
C) distribute CCE for the DCI2A of UE4: adopting the CCE degree of polymerization earlier is 2 to distribute, and the CCE that is calculated by the Hash function is CCE6 and CCE7, and according to the use information of current CCE as can be known: CCE6 and CCE7 are occupied, and the PDCCH candidate counts M (2)In CCE10 and CCE11 unoccupied, so CCE10 and CCE11 are distributed to the DCI2A of UE4.Then, CCE10 and CCE11 sent to the mapping processing unit carries out CCE10 and CCE11 is mapped to the processing of PDCCH, and upgrade CCE and use information;
D) DCI1 for UE7 distributes CCE: because DCI1 is non-DCI2/2A, so the CCE degree of polymerization is calculated CCE since 1 value, calculating the required CCE of distribution by the Hash function is CCE0, and owing to CCE0 has distributed to first DCI1C, has been that CCE0 is occupied, and the PDCCH candidate counts M (1)In CCE all occupied; So, this DCI1 can with the CCE degree of polymerization get 2, calculate by the Hash function that to distribute required CCE be CCE32 and CCE33, according to the use information of current CCE as can be known: CCE32 and CCE33 are unoccupied, so CCE32 and CCE33 are distributed to the DCI1 of UE7.Then, CCE32 and CCE33 sent to the mapping processing unit carries out CCE32 and CCE33 is mapped to the processing of PDCCH, and upgrade the use information of CCE;
E) distribute CCE for the DCI2 of UE0: the CCE degree of polymerization that can use DCI2 is since 2 values, and calculating the required CCE of distribution by the Hash function is CCE24 and CCE25, and this CCE24 and CCE25 are occupied, and the PDCCH candidate counts M (2)In CCE26 and CCE27 unoccupied, so CCE26 and CCE27 are distributed to the DCI2 of UE0.Then, CCE26 and CCE27 sent to the mapping processing unit carries out CCE26 and CCE27 is mapped to the processing of PDCCH, and upgrade the use information of CCE.
Then, judge whether the DCIx in the descending DCI formation all assigns,, then return the DCIx that extracts CCE to be allocated in the descending DCI formation successively, for it distributes CCE if do not finish the batch operation of CCE; If there is not the DCIx of CCE to be allocated, then the CCE in this TTI has assigned.
What instantiation one and instantiation two provided is: in the sub-district of FDD standard, up DCI and descending DCI distribute the order of CCE and carry out under the parameter configuration different situations of batch operation, the distribution method of control channel resource, the following describes in the sub-district of time division duplex (TDD) standard, total CCE number is less than 16 CCE and does not have under the situation of CCE to be allocated such as public DCI, the method that CCE is distributed.
Instantiation three:
In the present embodiment, make the ascending-descending subframes of TDD standard sub-district be configured to 1, Cyclic Prefix is configured to expansion (Extended), bandwidth is that 3MHz, employing 2 transmitting antenna ports, PDCCH take 3 OFDM symbols, PHICH group number is 2.And, 10 UE are arranged in the sub-district, be respectively UE0～UE9, be respectively 60,64～66,80～82,93 and 108～109 the C-RNTI of this UE0～UE9 number.In the subframe 9 of eating dishes without rice or wine, the DCI0 of DCI2, UE5 of DCI2, UE4 of DCI1, UE3 of the DCI0 of the DCI0 of UE0 and DCI1, UE1 and DCI1B, UE2 and the DCI1D CCE to be allocated of UE8 are arranged.
Step C1, CCE number that public space CCE allocation units calculation plot is total and public space CCE number;
It is 12 CCE that public space CCE allocation units calculate the total CCE number in sub-district according to formula (1), and the public space CCE number that draws the sub-district according to formula (2) is 12, is respectively CCE0～CCE11.Here, eat dishes without rice or wine do not have DCI must distribute public space CCE in the subframe 9.So public space CCE allocation units can send to the CCE main control unit with the use information of CCE, the use information of this CCE comprises herein: the total CCE in sub-district is several 12, public space CCE is several 12, remaining public space CCE several 12 and positional information thereof.Wherein, the positional information of this remaining public space CCE is represented with CCE0～CCE11.
Step C2, CCE main control unit calculate private space CCE number, the descending and up available CCE degree of polymerization;
After the use information of the CCE that CCE main control unit reception public space CCE allocation units are sent, calculate according to formula (5): private space CCE number is 0.This CCE main control unit gets access to from scheduler: the subframe of eating dishes without rice or wine 9,6 DCIx and 4 DCI0 CCE to be allocated are arranged, wherein, this DCIx comprises: 2 DCI2/2A and 4 non-DCI2/2A.DCI0 and DCIx take the ratio x of CCE: y=3: (2 * 2+4)=3: 8.So, the CCE number of distributing to DCIx is: ceil ((12+0) * 8/ (3+8))=9, so, have: L according to formula (8) xTherefore '=ceil (9/6)=2 obtains descending available CCE degree of polymerization L x(s) be: 1,2}.In addition, the CCE number of distributing to DCI0 is: floor ((12+0) * 3/ (3+8))=3 according to formula (10), has: L so 0'=ceil (3/3)=1, and, then DCI0 is carried out the allocation process of CCE because present embodiment carries out the allocation process of CCE earlier to DCIx.Therefore, require L 0"=max{2, L 0'=2, so obtain up available CCE degree of polymerization L 0(s) be: 1,2}.
And this CCE main control unit can be distributing to descending CCE number, residue public space CCE positional information and descending available CCE degree of polymerization L x(s) send to descending CCE and distribute subelement, and up available CCE degree of polymerization L 0(s) send to up CCE and distribute subelement.
Step C3, descending CCE distribute subelement DCIx to be carried out the allocation process of CCE;
What this descending CCE distribution subelement reception CCE main control unit sent distributes to descending CCE number and remains public space CCE positional information and descending available CCE degree of polymerization L x(s) etc. after the information, from descending DCI formation, take out a DCIx successively, and be that the DCIx that is taken out distributes CCE.In the present embodiment, make the priority in the descending DCI formation of respectively dispatching UE be followed successively by from high to low: UE1, UE2, UE8, UE4, UE0 and UE3.So, have:
A) DCI1B for UE1 distributes CCE: because DCI1B is non-DCI2/2A, so the CCE degree of polymerization is calculated CCE since 1 value, calculating the required CCE of distribution by formula (3), (4) is CCE8, according to the use information of current CCE as can be known: CCE8 is unoccupied, so distribute CCE8 to give the DCI1B of UE1.Then, CCE8 is sent to the mapping processing unit carry out the processing that CCE8 is mapped to PDCCH, and upgrade the use information of CCE.Here, the use information of this CCE comprises: remain descending public space CCE and be 8 etc.;
B) DCI1 for UE2 distributes CCE: because DCI1 is non-DCI2/2A, so the CCE degree of polymerization is calculated CCE since 1 value, calculated by formula (3), (4) that to distribute required CCE be CCE0, according to the use information of current CCE as can be known: CCE0 is unoccupied, so distribute the DCI1 of CCE0 to UE2.Then, CCE0 is sent to the mapping processing unit carry out the processing that CCE0 is mapped to PDCCH, and upgrade the use information of CCE.Here, the use information of this CCE comprises that the descending public space CCE of residue is 7 etc.;
C) DCI1D for UE8 distributes CCE: because DCI1D is non-DCI2/2A, so the CCE degree of polymerization is calculated CCE since 1 value, calculating the required CCE of distribution by formula (3), (4) is CCE9, according to the use information of current CCE as can be known: CCE9 is unoccupied, so distribute CCE9 to give the DCI1 of UE2.Then, CCE9 is sent to the mapping processing unit carry out the processing that CCE9 is mapped to PDCCH, and upgrade the use information of CCE.Here, the use information of this CCE comprises that the descending public space CCE of residue is 6 etc.;
D) distribute CCE for the DCI2 of UE4: the CCE degree of polymerization that can use DCI2 is since 2 values, calculating the required CCE of distribution by formula (3), (4) is CCE8 and CCE9, according to the use information of current CCE as can be known: this CCE8 and CCE9 are occupied, and the PDCCH candidate counts M (2)In CCE 10 and CCE11 unoccupied, so CCE10 and CCE11 are distributed to the DCI2 of UE4.Then, CCE10 and CCE11 sent to the mapping processing unit carries out CCE10 and CCE11 is mapped to the processing of PDCCH, and upgrade the use information of CCE.Here, the use information of this CCE comprises that the descending public space CCE of residue is 4 etc.;
E) DCI1 for UE0 distributes CCE: because DCI1 is non-DCI2/2A, so the CCE degree of polymerization is calculated CCE since 1 value, calculated by formula (3), (4) that to distribute required CCE be CCE9, according to the use information of current CCE as can be known: CCE9 is occupied, and the PDCCH candidate counts M (1)In CCE all occupied; So, this DCI1 can with the value of the CCE degree of polymerization get 2, calculate by formula (3), (4) that to distribute required CCE be CCE6 and CCE7, according to the use information of current CCE as can be known: this CCE6 and CCE7 are unoccupied, so distribute CCE6 and the CCE7 DCI1 to UE0.Then, CCE6 and CCE7 sent to the mapping processing unit carries out CCE6 and CCE7 is mapped to the processing of PDCCH, and upgrade the use information of CCE.Here, the use information of this CCE comprises that the descending public space CCE of residue is 3 etc.;
F) distribute CCE for the DCI2 of UE3: the CCE degree of polymerization that can use DCI2 is since 2 values, calculating the required CCE of distribution by formula (3), (4) is CCE8 and CCE9, according to the use information of current CCE as can be known: this CCE8 and CCE9 are occupied, and the PDCCH candidate counts M (2)In CCE all occupied, and descending available CCE degree of polymerization L x(s) use up, the CCE of the DCI2 of UE3 distributes the knowledge failure.
Then, judging whether DCIx in the descending DCI formation all distributes to finish, if do not finish the operation that distributes CCE, then return the DCIx that extracts CCE to be allocated in the descending DCI formation successively, is that it distributes CCE; If all finished the operation that distributes CCE, then this descending CCE distributes subelement to distribute subelement to send the use information of the CCE after upgrading to up CCE.Herein, the use information of CCE after this renewal comprises residue private space CCE number, residue public space CCE number and positional information, specifically comprise: residue private space CCE number is 0, and residue public space CCE number is 5, and CCE0 and CCE6～CCE11 are occupied.In addition, for distributing the result of CCE, this DCIx sees Table shown in four:
Figure B2009100855009D0000301
Table four
Step C4, up CCE distribute subelement DCI0 to be carried out the allocation process of CCE.
Up CCE distributes the descending CCE of subelement reception to distribute subelement the residue private space CCE that sends and the number and the positional information that remain public space CCE, and the up DCI to each scheduling UE carries out the CCE distribution successively.In the present embodiment, make the priority in the up DCI formation of respectively dispatching UE be followed successively by from high to low: UE0, UE5 and UE1.
A) be that the DCI0 of UE0 distributes the CCE:CCE degree of polymerization since 1 value, the CCE that is calculated by formula (3), (4) is CCE9, and according to the use information of current CCE as can be known: CCE9 is occupied, and the PDCCH candidate counts M (1)In CCE all occupied; So, for this DCI0 from L 0(s) get the value 2 of the next available CCE degree of polymerization in, calculated by the Hash function that to distribute required CCE be CCE6 and CCE7, according to the use information of current CCE as can be known: this CCE6 and CCE7 are occupied, and the PDCCH candidate counts M (2)In CCE all occupied, and L 0The value of the CCE degree of polymerization (s) has been got, and the CCE of the DCI0 of UE0 distributes the knowledge failure.
B) be that the DCI0 of UE5 distributes CCE:CCE degree of polymerization L since 1 value, the CCE that is calculated by formula (3), (4) is CCE8, and according to the use information of current CCE as can be known: CCE8 is occupied, and the PDCCH candidate counts M (1)In CCE all occupied; So, for this DCI0 from L 0(s) get the value 2 of the next available CCE degree of polymerization in, calculated by formula (3), (4) that to distribute required CCE be CCE4 and CCE5, according to the use information of current CCE as can be known: this CCE4 and CCE5 are unoccupied, so distribute CCE4 and the CCE5 DCI0 to UE5.Then, CCE4 and CCE5 sent to the mapping processing unit carries out CCE4 and CCE5 is mapped to the processing of PDCCH, and upgrade the use information of CCE.Here, the use information of this CCE comprises: remain up public space CCE and be 3 etc.;
C) be that the DCI0 of UE1 distributes CCE:CCE degree of polymerization L since 1 value, the CCE that is calculated by formula (3), (4) is CCE8, and according to the use information of current CCE as can be known: CCE8 is occupied, and the PDCCH candidate counts M (1)In CCE all occupied; So, for this DCI0 from L 0(s) get the value 2 of the next available CCE degree of polymerization in, calculated by formula (3), (4) that to distribute required CCE be CCE4 and CCE5, according to the use information of current CCE as can be known: this CCE4 and CCE5 are occupied, and the PDCCH candidate counts M (2)In CCE all occupied, and L 0The value of the CCE degree of polymerization (s) has been got, and the CCE of the DCI0 of UE1 distributes failure.
Then, judge whether the DCI0 that respectively dispatches UE in the up DCI formation finishes batch operation,, then return the DCI0 that takes out CCE to be allocated in this up DCI formation successively, carry out CCE and distribute if be still waiting to distribute the DCI0 of CCE; If there is not the DCI0 of CCE to be allocated, then the CCE in this TTI has assigned.In addition, distributing for DCIx on the basis as a result of CCE, seeing Table shown in five for this DCI0 distributes the result of CCE:
Figure B2009100855009D0000311
Table five
For each above-mentioned embodiment, for simple description, so it all is expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not subjected to the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.
For realizing said method, the present invention also provides a kind of distributor of control channel resource, is positioned at network side, on base station (eNB), comprises medium access control (MAC) sublayer and physical layer.This device comprises: public space CCE allocation units 601, CCE main control unit 602, CCE allocation units 603 and mapping processing unit 604.Here, public space CCE allocation units 601, CCE main control unit 602, CCE allocation units 603, scheduler 605 and information updating unit 606 are positioned at the MAC layer, and mapping processing unit 604 is positioned at physical layer, wherein,
Public space CCE allocation units 601 are used to calculate public space CCE, and are the DCI distribution CCE of public space CCE to be allocated, notice mapping processing unit 604 and CCE main control unit 602 then.
Total CCE and public space CCE in described public space CCE allocation units 601 calculation plots, and obtain the DCI to public space CCE to be allocated the current TTI from scheduler 605, this DCI is carried out the distribution of public space CCE.
CCE main control unit 602 is used to calculate the CCE degree of polymerization.This CCE main control unit obtains the use information of CCE from public space CCE allocation units 601, be behind the total CCE number and remaining public space CCE number, obtain the number of DCIx to be scheduled and DCI0 the subframe of eating dishes without rice or wine from scheduler 605, with calculate residue CCE, up-downgoing occupies the available respectively CCE degree of polymerization of CCE ratio and DCIx and DCI0.And CCE main control unit 602 can the CCE degree of polymerization that use information, DCIx and the DCI0 of CCE is available respectively send to CCE allocation units 603.
CCE allocation units 603 are used to take out the value of the CCE degree of polymerization that described CCE main control unit 602 calculates, and come the required CCE of dispensed, and distribute CCE to DCI of each scheduling UE, then notice mapping processing unit 604.
Mapping processing unit 604, the CCE that is used for described public space CCE allocation units 601, CCE allocation units 603 are distributed to DCI is mapped to PDCCH.
In the said apparatus, described CCE allocation units 603 comprise: descending CCE distributes subelement 6031 and up CCE to distribute subelement 6032, wherein,
Descending CCE distributes subelement 6031, be used for taking out successively from small to large the value of the descending available CCE degree of polymerization that described CCE main control unit 602 calculates, come the required CCE of dispensed, the use information that the CCE that provides according to CCE main control unit 602 also is provided judges whether the CCE that calculates is occupied, and to descending DCI distribution CCE, upgrade the use information of current C CE, and distribute the subelement interactive information with up CCE.And the CCE that descending CCE distributes subelement 6031 also to be used to notify mapping processing unit 604 will distribute to descending DCI is mapped to PDCCH, upgrades the use information of current CCE then.This descending CCE distributes subelement 6031 and up CCE distribution subelement 6032 interactive information.For example:, then the use information of the CCE after upgrading can be sent to and not carry out the up CCE distribution subelement 6032 that CCE distributes as yet if descending CCE distributes subelement 6031 to carry out the distribution of CCE earlier.
Up CCE distributes subelement 6032, be used for taking out successively from small to large the value of the up available CCE degree of polymerization that described CCE main control unit 602 calculates, come the required CCE of dispensed, the use information that the CCE that provides according to CCE main control unit 602 also is provided judges whether the CCE that calculates is occupied, and distributes CCE to up DCI.And the CCE that up CCE distributes subelement 6032 also to be used to notify mapping processing unit 604 will distribute to up DCI is mapped to PDCCH, upgrades the use information of current CCE then.This up CCE distributes subelement 6032 and descending CCE distribution subelement 6031 interactive information.
Said apparatus also comprises: scheduler 605, be used for providing the DCI formation of public space CCE to be allocated to described public space CCE allocation units 601, distribute subelement 6032 that the up DCI formation of respectively dispatching UE is provided to described up CCE, and distribute subelement 6031 that the descending DCI formation of respectively dispatching UE is provided to described descending CCE.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, do not have the part that describes in detail among certain embodiment, can get final product referring to the associated description of other embodiment.The above only is preferred embodiment of the present invention, just is used for description and interpretation the present invention, is not to be used to limit protection scope of the present invention.Within spirit of the present invention and claim protection range, to any modification that the present invention did, be equal to replacement, all fall into protection scope of the present invention.

Claims (10)

1. the distribution method of a control channel resource is characterized in that, comprising:
Public space control channel unit CCE is calculated in the base station, is that the Downlink Control Information DCI of public space CCE to be allocated distributes CCE, and the CCE that will distribute to DCI is mapped to physical downlink control channel PDCCH;
The CCE degree of polymerization is calculated in the base station, and the value of the taking-up CCE degree of polymerization is come the required CCE of dispensed;
CCE is distributed to the DCI of each scheduling user's set UE in the base station, and the CCE that will distribute to DCI is mapped to PDCCH.
2. the distribution method of control channel resource according to claim 1 is characterized in that, the step that public space CCE is calculated in described base station comprises:
Calculate total CCE;
Get minimum value in total CCE number and 16 as public space CCE number.
3. the distribution method of control channel resource according to claim 2 is characterized in that, described DCI for public space CCE to be allocated distributes CCE to comprise:
DCI is taken out successively in the base station from the DCI formation of public space CCE to be allocated;
According to the CCE degree of polymerization is 4, is calculated as the CCE of the DCI distribution of being taken out, and carries out the distribution of CCE to this DCI.
4. according to the distribution method of claim 1 or 2 or 3 described control channel resources, it is characterized in that described base station is calculated the CCE degree of polymerization and comprised: calculate the up available CCE degree of polymerization and the descending available CCE degree of polymerization, wherein,
The maximum of this up available CCE degree of polymerization is: distribute to the ratio of the number of the CCE number of up DCI and this up DCI, and round up into gather 1,2,4, the minimum value among the 8};
The maximum of this descending available CCE degree of polymerization is: distribute to the ratio of the number of the CCE number of descending DCI and this descending DCI, and round up into gather 1,2,4, the minimum value among the 8};
Wherein, the described CCE number of distributing to up DCI is: the CCE number that up DCI is occupied in remaining CCE; The described CCE number of distributing to descending DCI is: the CCE number that descending DCI is occupied in remaining CCE; Described remaining CCE is: deduct the resulting CCE of public space CCE that distributes to DCI from total CCE;
When this descending DCI was DCI2/2A, the value of the CCE degree of polymerization that this DCI2/2A can use was since 2 values;
If earlier descending DCI is distributed CCE, then requires the up available CCE degree of polymerization to comprise two values 1 and 2 at least;
If earlier up DCI is distributed CCE, then requires the descending available CCE degree of polymerization to comprise two values 1 and 2 at least.
5. the distribution method of control channel resource according to claim 4 is characterized in that, the value of the described taking-up CCE degree of polymerization comes the required CCE of dispensed to comprise:
The DCI of CCE to be allocated is taken out from high to low successively according to the priority in the DCI formation of each scheduling UE in the base station;
Take out a value from small to large successively the value of the CCE degree of polymerization that can use from the DCI of CCE to be allocated, come the required CCE of dispensed by hash function;
Wherein, this DCI formation of respectively dispatching UE comprises up DCI formation and descending DCI formation.
6. the distribution method of control channel resource according to claim 5 is characterized in that, after the step of the CCE that described dispensed is required, this method also comprises:
The base station judges whether the CCE that calculates is occupied, if unoccupied, then the CCE that this is calculated distributes to this DCI;
If occupied, check then in the PDCCH candidate number whether unappropriated CCE is arranged, if having, then distribute to this DCI; If there is not unappropriated CCE, then from the CCE degree of polymerization of this DCI, take out a value more from small to large successively, the CCE that dispensed is required successfully is assigned to CCE or has got the value of the CCE degree of polymerization that this DCI can use up to this DCI.
7. according to the distribution method of the control channel resource described in the claim 6, it is characterized in that the described CCE that will distribute to DCI is mapped to after the step of Physical Downlink Control Channel, this method also comprises:
The use information of CCE is upgraded in the base station, and this renewal operation is specially:
The user mode of occupied CCE is revised as seizure condition, and calculates remaining CCE number.
8. the distributor of a control channel resource is characterized in that, comprising: public space CCE allocation units, CCE main control unit, CCE allocation units and mapping processing unit, wherein,
Public space CCE allocation units are used to calculate public space CCE, and are the DCI distribution CCE of public space CCE to be allocated, notice mapping processing unit and CCE main control unit then;
The CCE main control unit is used to calculate the CCE degree of polymerization;
The CCE allocation units are used to take out the value of the CCE degree of polymerization that described CCE main control unit calculates, and come the required CCE of dispensed, and distribute CCE to DCI of each scheduling UE, then notice mapping processing unit;
The mapping processing unit, the CCE that is used for distributing to DCI is mapped to PDCCH.
9. the distributor of control channel resource according to claim 8 is characterized in that, described CCE allocation units comprise: descending CCE distributes subelement and up CCE to distribute subelement, wherein,
Descending CCE distributes subelement, be used for taking out successively from small to large the value of the descending available CCE degree of polymerization that described CCE main control unit calculates, come the required CCE of dispensed, the use information that the CCE that provides according to the CCE main control unit also is provided judges whether the CCE that calculates is occupied, and to descending DCI distribution CCE, and the CCE that notifies described mapping processing unit will distribute to descending DCI is mapped to PDCCH, upgrade the use information of current C CE then, and distribute the subelement interactive information with up CCE;
Up CCE distributes subelement, be used for taking out successively from small to large the value of the up available CCE degree of polymerization that described CCE main control unit calculates, come the required CCE of dispensed, the use information that the CCE that provides according to the CCE main control unit also is provided judges whether the CCE that calculates is occupied, and to up DCI distribution CCE, and the CCE that notifies described mapping processing unit will distribute to up DCI is mapped to PDCCH, upgrade the use information of current C CE then, and distribute the subelement interactive information with descending CCE.
10. the distributor of control channel resource according to claim 9 is characterized in that, this device also comprises:
Scheduler, be used for providing the DCI formation of public space CCE to be allocated, the up DCI formation that distributes subelement to provide respectively to dispatch UE to described up CCE and distribute subelement that the descending DCI formation of respectively dispatching UE is provided to described descending CCE to described public space CCE allocation units.
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