CN103988563A - Method and device for mapping search space of downlink control channel - Google Patents

Method and device for mapping search space of downlink control channel Download PDF

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CN103988563A
CN103988563A CN201280061630.9A CN201280061630A CN103988563A CN 103988563 A CN103988563 A CN 103988563A CN 201280061630 A CN201280061630 A CN 201280061630A CN 103988563 A CN103988563 A CN 103988563A
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cce
pdcch
different
position candidate
search space
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CN103988563B (en
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王轶
张元涛
周华
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Fujitsu Ltd
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Fujitsu Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows

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Abstract

Embodiments of the present invention provide a method and device for mapping a search space of a downlink control channel (PDCCH). The method comprises: determining, according to a resource allocation manner, a search space allocated to a PDCCH; and spaced by a resource block (RB), mapping each candidate position (candidate) of the PDCCH to a time-frequency resource corresponding to the search space. According to the method and device in the embodiments of the present invention, different candidates of the PDCCH are mapped to different RBs, so as to obtain a frequency selectivity scheduling gain, thereby improving the performance of the PDCCH.

Description

Method and device for mapping search space of downlink control channel
The mapping method and engineering device technique field of the search space of down control channel
The present invention relates to wireless communication technology, more specifically to LTE (Long Term Evolution, Long Term Evolution）/ LTE-A (LTE-Advanced, enhanced Long Term Evolution）The mapping method and device of the search space of down control channel in system.Background technology
With EUTRA (Evolved Universal Terrestrial Radio Access, the general land wireless access of evolution）The evolution of network, occurs in that many new scenes, such as heterogeneous network with identical or different cell ID.The new characteristic of data channel and control channel should be introduced into.For enhanced PDCCH (Physical Downlink Control Channel, Physical Downlink Control Channel）, it is necessary to consider herein below：
Increased control channel capacity can be supported；
Frequency domain ICIC (Inter-Cell Interference Coordination, inter-cell interference cancellation technology can be supported）；The space huge profit that control channel resource can be improved is used；
Wave beam forming and/or diversity can be supported；
Can be on new carrier type and MBSFN ((Multicast Broadcast Single Frequency Network, multicast broadcast single frequency network）Operated in subframe；
Can be with traditional UE (User Equipment, user equipment）Coexisted on same carrier wave.
Desired characteristic includes the ability selected with scheduling frequency and the ability for mitigating inter-cell interference.Based on above demand, E-PDCCH (Enhanced-PDCCH, enhanced PDCCH) can be allowed to be located at traditional PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel）Region.E-PDCCH is the design of search space positioned at a subject matter of traditional PDSCH region.UE is its E-PDCCH of blind Detecting in the region of its distribution in network side.This region can be semi-statically configured by high-level signaling, can also carry out dynamic configuration by the signaling of layer 1.For E-PDCCH, mainly there are two kinds of mapping schemes, that is, local mapping and distributed mapping.For local mapping, it is desirable to obtain frequency selective scheduling gain and frequency selective beam figuration gain, namely eNB (base stations）E-PDCCH can be transmitted on the subcarrier with preferable channel response.
In existing system, search space includes having different polymerization levels（Aggregation Level) multiple position candidates（Candidate), as shown in table 1, for each polymerization level, it is configured with multiple position candidates.Such as What by multiple alternate location mappings to search space to obtain frequency selective scheduling gain or frequency diversity gain, it is extremely important for E-PDCCH.
In the Rel-8 of LTE system, the function of search space is defined as foloows:
L{(Yk + m')mod[NCCE Ic /∑} + i
Wherein, YkIt is and C-RNTI (Cell Radio Network Temporary Identifier, Cell Radio Network Temporary Identifier/Identity, Cell-RNTI）Related UE special parameters, i=0, " Λ -1, Ncc¾(tBe subframe k control area in CCE (Control Channel Element, control channel unit）Total quantity.
By the function, the starting point of each UE search space can be determined using UE special parameters.However, it is contemplated that parameter YkIt is only relevant with sub-frame number and C-RNTI, it is impossible to ensure that search space includes the subcarrier for the channel quality having had.It is thus impossible to obtain frequency scheduling gain.
In order that UE obtains frequency scheduling gain, E-PDCCH resources should pass through the special high-level signaling configurations of UE or dynamic configuration.If configuring E-PDCCH resources by high-level signaling, then design search space to support at least one position candidate being located on the carrier wave with preferable channel quality just extremely important.If reusing existing search space function, multiple position candidates are mapped on adjacent subcarrier, for example, 4 position candidates are mapped on identical resource block, this will likely limit E-PDCCH all position candidates experience identical channel fading, it is thus impossible to obtain frequency scheduling gain.
It should be noted that the introduction to technical background is intended merely to the convenient explanation clear, complete to technical scheme progress above, and facilitates the understanding of those skilled in the art and illustrate.Can not be merely because these schemes be set forth in the background section of the present invention and think that above-mentioned technical proposal is known to those skilled in the art.The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of mapping method and device of the search space of down control channel, to obtain frequency selective scheduling gain.
There is provided a kind of mapping side of the search space of down control channel for one side according to embodiments of the present invention Method, wherein, methods described includes：
Down control channel is defined as according to resource distribution mode（PDCCH) the search space of distribution；
With resource block（RB it is) interval, by each position candidate of the PDCCH（Candidate) it is mapped on the corresponding running time-frequency resource in the search space.
One side according to embodiments of the present invention is there is provided a kind of base station, and it is used for the mapping for carrying out the search space of down control channel, wherein, the base station includes：
Determining unit, it is defined as down control channel according to resource distribution mode（PDCCH) the search space of distribution；Map unit, it is using resource block RB as interval, by each position candidate of the PDCCH（Candidate) it is mapped on the corresponding running time-frequency resource in the search space.
One side according to embodiments of the present invention there is provided a kind of computer-readable program, wherein, when performing the program in a base station, the program causes computer to perform the mapping method of the search space of foregoing down control channel in the base station.
One side according to embodiments of the present invention there is provided a kind of storage medium for the computer-readable program that is stored with, wherein, the computer-readable program causes computer to perform the mapping method of the search space of foregoing down control channel in a base station.
The beneficial effect of the embodiment of the present invention is：By the way that PDCCH different candidate are mapped in different RB, frequency selective scheduling gain is obtained, so as to improve PDCCH performance.
With reference to explanation hereinafter and accompanying drawing, only certain exemplary embodiments of this invention is disclose in detail, the principle for specifying the present invention can be in adopted mode.It should be understood that embodiments of the present invention are not so limited in scope.In the range of the spirit and terms of appended claims, embodiments of the present invention include many changes, modifications and equivalent.
Described for a kind of embodiment and/or the feature that shows can be used in same or similar mode in one or more other embodiments, it is combined with feature in other embodiment, or substitute the feature in other embodiment.
It should be emphasized that term " include/include " refers to the presence of feature, one integral piece, step or component when being used herein, but it is not precluded from the presence or additional of one or more further features, one integral piece, step or component.Brief description of the drawings
Many aspects of the present invention may be better understood with reference to following accompanying drawing.Part in accompanying drawing is not proportional drafting, and is intended merely to show the principle of the present invention.For the ease of showing and describing some parts of the present invention, accompanying drawing Middle corresponding part may be exaggerated or minimized.The element and feature that element and feature described in a kind of accompanying drawing or embodiment of the present invention can be shown in one or more other accompanying drawings or embodiment are combined.In addition, in the accompanying drawings, similar label represents corresponding part in several accompanying drawings, and may be used to indicate the corresponding component used in more than one embodiment.In the accompanying drawings：
Fig. 1 is the mapping method flow chart of the search space of the down control channel of the embodiment of the present invention；
Fig. 2 is to utilize formula（Or formula 1)（2) schematic diagram of the one embodiment mapped；
Fig. 3 is to utilize formula（Or formula 1)（2) schematic diagram of the another embodiment mapped；Fig. 4 is to utilize formula（3) schematic diagram of the one embodiment mapped；
Fig. 5 is to utilize formula（4) schematic diagram of the one embodiment mapped；
Fig. 6 is to utilize formula（5) schematic diagram of the one embodiment mapped；
Fig. 7 is the composition schematic diagram of the base station of the embodiment of the present invention.Embodiment
Referring to the drawings, by following specification, the foregoing and further feature of the embodiment of the present invention will be apparent.These embodiments are exemplary, are not limitations of the present invention.In order that those skilled in the art can easily understand that the principle and embodiment of the present invention, embodiments of the present invention in lte-a system exemplified by the mapping of the search space for the PDCCH (hereinafter referred to as PDCCH or new PDCCH or E-PDCCH) that PDSCH region is sent to illustrate, it is to be understood that, the embodiment of the present invention is not limited to said system, and the other systems or scene of the mapping of the search space for being related to PDCCH are applicable.
Embodiment 1
The embodiments of the invention provide a kind of mapping method of the search space of down control channel.Fig. 1 is the flow chart of this method, refer to Fig. 1, and this method includes：
Step 101:Down control channel is defined as according to resource distribution mode（PDCCH) the search space of distribution；Step 102:With resource block（RB it is) interval, by each position candidate of the PDCCH（Candidate) it is mapped on the corresponding running time-frequency resource in the search space.
In the present embodiment, PDCCH is used for bearing downlink control information（DCI, Downlink Control Information), with control channel unit（CCE, Control Channel Element) constructed for least unit, as shown in table 1, a PDCCH can be made up of L CCE, and L spans are 1,2,4,8, and it represents PDCCH different extent of polymerizations（Aggregation level), this L CCE may be in MwIndividual position It is upper to send.
In the present embodiment, resource distribution mode is, for example, typeO, typel, type2 etc., according to different resource distribution modes, it may be determined that the search space distributed for PDCCH.For example, the resource distribution mode based on typeO, 6 RBG (Resource Block Group, resource block group are assigned with to PDCCH）, according to different system bandwidths, RBG length（Size) different, such as system bandwidth is 10MHz, and RBG size are 3 RB, then are assigned with 18 RB equivalent to PDCCH.For another example the resource distribution mode based on typeO, 3 RBG are assigned with to PDCCH, if then system bandwidth is 10MHz, RGB size are 3 RB, then are assigned with 9 RB equivalent to PDCCH.For another example the resource distribution mode based on type2,12 RB are assigned with to PDCCH.Wherein, resource distribution mode can report to user by system configuration by high-level signaling.Wherein, each RB can include multiple CCE again, in the present embodiment, be illustrated so that each RB includes 4 CCE as an example.
Wherein, the resource distribution mode of above several types is merely illustrative, and the embodiment of the present invention is not in this, as limitation, with the development of technology, it is possible to new resource distribution mode, such as RB-level bitmap mode occurs.The method of the embodiment of the present invention can also be used under this resource distribution mode.
In the present embodiment, according to different polymerization levels, E-PDCCH each position candidate passes through the step-length of the unit newly defined（For example using RB as step-length）It is mapped in the E-PDCCH resources of distribution, to obtain frequency selection scheduling gain.That is, PDCCH different position candidates are assigned to different running time-frequency resources as far as possible, the different piece of a position candidate is assigned on adjacent running time-frequency resource.
In one embodiment, if PDCCH distribute search space RB quantity M(RB)The quantity M of position candidate not less than the PDCCHw, namely Μ(ΚΒ) Μ(Then by the different RB of each alternate location mappings of the PDCCH to the corresponding running time-frequency resource in the search space.
For example, the quantity M of the RB for the PDCCH search spaces distributed(RB)For 8, then as L=l or 2, the quantity M of PDCCH position candidatewFor 6, Μ is met(ΚΒ) Μ(ΙThat is, the quantity for the PDCCH RB distributed is enough to put down PDCCH all position candidates, then directly by each alternate location mappings of the PDCCH to different RB.
In one embodiment, if PDCCH distribute search space RB quantity M(RB)Less than the quantity M of the position candidatew, namely M(RB)<MW, then first by the M of the PDCCH(RB)Individual alternate location mappings are in the different RB of the corresponding running time-frequency resource in the search space, according still further to the mode of cyclic shift, by the different RB of remaining alternate location mappings to the corresponding running time-frequency resource in the search space.
For example, the quantity M of the RB for the PDCCH search spaces distributed(RB)For 4, then as L=l or 2, The quantity M of PDCCH position candidate(L·)For 6, M is met(RB)< M(L)Namely, for the PDCCH RB distributed lazy weight to put down PDCCH all position candidates, 4 position candidates are then first connect to be respectively mapped in this 4 RB, according still further to the mode of cyclic shift, by remaining 2 position candidates be respectively mapped in first RB and second RB in.
In embodiments of the present invention, it is included in both examples above, for different polymerization levels, the starting point of PDCCH position candidate can be located in identical RB, can also be located in different RB.
For example, if the starting point of PDCCH position candidate is located in first RB during L=l, the starting point of PDCCH position candidate can be located in first RB during L=2, can also be located in second RB；Similarly, the starting point of PDCCH position candidate can be located in first RB during L=4, can also be located in the 3rd RB or the 4th RB.By that analogy.
In embodiments of the present invention, it is included in both examples above, for different RB, PDCCH position candidate may map to CCE ordinal positions different in different RB, can also be mapped to identical CCE ordinal positions in different RB.That is, each position candidate for the PDCCH being mapped in different RB, the position of the CCE on the different RB is identical or difference.
For example, if PDCCH first alternate location mappings are on first RB the 4th CCE, then second position candidate of the PDCCH may map on second RB the 4th CCE, on other CCE that can also be mapped to second RB, such as on first CCE；Similarly, the 3rd position candidate of the PDCCH may map on the 3rd RB the 4th CCE, on other CCE that can also be mapped to the 3rd RB, such as on second CCE；Similarly, the 4th position candidate of the PDCCH may map on the 4th RB the 4th CCE, on other CCE that can also be mapped to the 4th RB, such as on the 3rd CCE.By that analogy.
Wherein, if M(RB)<M(L), then for above-mentioned " identical " it may is that, PDCCH M(RB)CCE of the individual position candidate on each RB position is identical, and CCE of the remaining position candidate on each RB position is identical.For above-mentioned " difference " it may is that, PDCCH M(RB)CCE of the individual position candidate on each RB position is different, and CCE of the remaining position candidate on each RB position is different.
Wherein, if M(RB) M(L), then for above-mentioned " identical " it may is that, the CCE of PDCCH each position candidate on each RB position is identical.For above-mentioned " difference " it may is that, using the position candidate of the RB CCE included quantity as one group, the position of CCE of the position candidate on each RB in this group is different, the position candidate for that can not be divided into one group, and its CCE on each RB position is not Together.Exemplified by foregoing, M(RB)For 8, MwFor 6, a RB includes 4 CCE, then position of preceding 4 position candidates on 4 RB is different, and rear 2 position candidates can not be divided into one group, then position of the two position candidates on two other RB is different.
In the present embodiment, if polymerization level is not more than control Channel Elements in each RB（CCE quantity), then all CCE of PDCCH a position candidate be mapped in identical RB.If for example, polymerizeing horizontal L=l or 2, a RB includes 4 CCE, then meets above-mentioned relation, 1 or 2 CCE that a PDCCH position candidate is included is mapped in same RB.If for another example polymerizeing horizontal L=4, one RB includes 4 CCE, then meeting above-mentioned relation, 4 CCE that a PDCCH position candidate is included are mapped in same RB.
In one embodiment, when for different polymerization levels, the starting point of PDCCH position candidate is located in different RB, and for different RB, PDCCH alternate location mappings are in different RB during identical CCE ordinal positions：
CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space can be determined according to below equation:
mod(NCC£ m x mod(m, Μ(ΛΒ) ) + L(Xk + [m I Μ(ΛΒ) J) + ί, NCCE) (1) can also determine CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space according to below equation:
L {mod(((NCC£ / L]) }+i (2) wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration, it is a parameter for distinguishing start position of the different user in E-PDCCH resources.For L=l, it represents the relative skew of the starting CCE relative to E-PDCCH resources.Such as E-PDCCH resources are 4 RB, that is, 16 CCE, Xk=l is represented since the 1st RB the 2nd CCE. Xk=10 represent since the 3rd RB the 3rd CCE.And for L=2, the difference of the method provided according to embodiments of the present invention, corresponding starting point is different；I=0, L-1, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
In order that the method for the embodiment is more clear understandable, the mapping method of the embodiment is illustrated by specific example below in conjunction with accompanying drawing.
Fig. 2 is the mapping schematic diagram of the PDCCH of one embodiment of the invention search space.The embodiment is with M(RB)=4, XkExemplified by=2, according to formula（Or formula 1)（2), it is possible to achieve mapping result as shown in Figure 2. Fig. 2 is refer to, because a RB includes 4 CCE, then M(RB)When=4, NCCE=16, that is, be assigned with 4 RB for the PDCCH, totally 16 CCE, numbering is 0 ~ 15.
As L=l, PDCCH is made up of 1 CCE, and with reference to table 1, the PDCCH has 6 position candidates, namely Mw=6, that is to say, that this CCE of the PDCCH may be sent in 6 position candidates, then 1 CCE of each position candidate correspondence.Due to Xk=2, then after two CCE are offset, 6 CCE (logical time-frequency resources since the 3rd CCE (numbering is 2)）To should PDCCH 6 position candidates.By the method for the present embodiment, this 6 position candidates are mapped in corresponding 4 RB of physical time-frequency resource with RB step-lengths, the numbering in 10MHz (50 RB) bandwidth as shown in Figure 2 is in 0,3,6,48 RB.Due to meeting M(RB) <M(L), then will first CCE (the position candidates for being 2,3,4,5 be numbered）It is mapped in different RB, according still further to the mode of cyclic shift, the CCE (position candidates for being 6,7 will be numbered）It is mapped in corresponding RB, RB here refers to the corresponding RB of physical resource.As shown in Figure 2, the CCE for being 2 will be numbered to be mapped in the RB that the numbering of physical time-frequency resource is 0, the CCE for being 3 will be numbered to be mapped in the RB that the numbering of physical time-frequency resource is 3, the CCE for being 4 will be numbered to be mapped in the RB that the numbering of physical time-frequency resource is 6, the CCE for being 5 will be numbered to be mapped in the RB that the numbering of physical time-frequency resource is 48, it is that 6 CCE are mapped in the RB that the numbering of physical time-frequency resource is 0 by numbering, the CCE for being 7 will be numbered and be mapped in the RB that the numbering of physical time-frequency resource is 3.In the present embodiment, the position on CCE of each position candidate in each RB is identical, as shown in Figure 2, numbering is 2,3,4,5 CCE is mapped on each RB the 3rd CCE, and the CCE that numbering is 6,7 is mapped on each RB the 4th CCE.
Similarly, as L=2, PDCCH is made up of 2 CCE, and with reference to table 1, the PDCCH has 6 position candidates, namely Mw=6, that is to say, that the two CCE of the PDCCH may be sent in 6 position candidates, then 2 CCE of each position candidate correspondence.Due to Xk=2, then the present embodiment is after 4 CCE are offset, 12 CCE (logical time-frequency resources since the 5th CCE (numbering is 4)）To should PDCCH 6 position candidates.By the method for the present embodiment, this 6 position candidates are mapped in corresponding 4 RB of physical time-frequency resource with RB step-lengths, in the RB that the corresponding numbering of physical time-frequency resource as shown in Figure 2 is 0,3,6,48.Because the present embodiment is for different L, the starting point of position candidate is located in different RB, PDCCH first position candidate during therefore L=2（Numbering is 4,5 CCE) it is mapped in second RB (RB that the numbering of correspondence physical time-frequency resource is 3), and due to meeting M(RB)<M(L), then it is by numbering first（4,5), the CCE (position candidates of (6,7), (8,9), (10,11)）It is mapped in different RB, according still further to the mode of cyclic shift, is by numbering（12,13), the CCE (position candidates of (14,15)）It is mapped in corresponding RB.In the present embodiment, with foregoing L=l's Situation is similar, and CCE of each position candidate in each RB position is identical, as shown in Fig. 2 numbering is（4,5 )、 (6,7)、（8,9)、（10,11) position candidate be all take each RB the 1st, 2 CCE, numbering is（12,13), the position candidate of (14,15) be all take each RB the 3rd, 4 CCE.
Similarly, as L=4, PDCCH is made up of 4 CCE, and with reference to table 1, the PDCCH has 2 position candidates, namely Mw=2, that is to say, that this four CCE of the PDCCH may be sent in 2 position candidates, then 4 CCE of each position candidate correspondence.Due to Xk=2, then the present embodiment after 8 CCE are offset, 8 CCE since the 9th CCE (numbering is 8) to should PDCCH 2 position candidates.By the method for the present embodiment, this 2 position candidates are mapped to by step-length of RB in two RB of physical time-frequency resource.Likewise, because the present embodiment is for different L, the starting point of position candidate is located in different RB, the starting point of PDCCH position candidate during therefore L=4（8,9,10,11) to be mapped in the 3rd RB (RB that the numbering of correspondence physical time-frequency resource is 6), due to each position candidate 4 CCE of correspondence, therefore, a position candidate has just taken whole RB.
In the above description, the corresponding RB of physical time-frequency resource (numbering is respectively 0,3,6,48) that each position candidate of the PDCCH is be mapped to, is also for example, the present embodiment is not in this, as limitation.
Pass through above formula（Or formula 1)（2) mapping of the position candidate of PDCCH shown in Fig. 2 can be realized, namely, it may be determined that the CCE that PDCCH each position candidate is be mapped to.In addition, from figure 2 it can be seen that passing through formula（Or formula 1)（2) mapping, in each RB, at least distributes a position candidate, at most two position candidates of distribution.
Fig. 3 is the mapping schematic diagram of the PDCCH of another embodiment of the present invention search space.The embodiment is with M(RB)=8, XkExemplified by=3, according to formula（Or formula 1)（2), it is possible to achieve mapping result as shown in Figure 3.
Fig. 3 is refer to, because a RB includes 4 CCE, then M(RB)When=8, NCCE=32, that is, be assigned with 8 RB for the PDCCH, totally 32 CCE, numbering is 0 ~ 31.
As L=l, PDCCH is made up of 1 CCE, and with reference to table 1, the PDCCH has 6 position candidates, namely Mw=6.Due to Xk=3, each position candidate 1 CCE of correspondence, then after 3 CCE are offset, 6 CCE since the 4th CCE (numbering is 3) to should PDCCH 6 position candidates.By the method for the present embodiment, this 6 position candidates are mapped in corresponding 8 RB of physical time-frequency resource with RB step-lengths, due to meeting M(RB) MW, then will directly 6 CCE (position candidates for being 3,4,5,6,7,8 be numbered）It is mapped in corresponding 6 RB of physical time-frequency resource, the starting point of its position candidate（Namely the CCE of numbering 3) be located in corresponding first RB (#1) of the physical time-frequency resource. Similarly, as L=2, PDCCH is made up of 2 CCE, and with reference to table 1, the PDCCH has 6 position candidates, namely Mw=6, each position candidate 2 CCE of correspondence, then the present embodiment after it offset by 6 CCE, 12 CCE since the 7th CCE (numbering is 6) to should PDCCH 6 position candidates.Pass through the method for the present embodiment, this 6 position candidates are mapped in corresponding 8 RB of physical time-frequency resource with RB step-lengths, because the starting point for different 1^, position candidate is located in different RB, therefore according to the method for cyclic shift, first position candidate（Numbering is 6,7 CCE) it is mapped in corresponding second RB (#2) of the physical time-frequency resource, by that analogy, numbering is（8,9)、 （10,11 )、 （12,13 )、 （14,15 )、 （16,17) CCE (position candidates）It is in #3, #4, #5, #6, #7 RB to be respectively mapped to the corresponding numbering of the physical time-frequency resource（CCE position is identical, be all the 3rd, 4 CCE).
Similarly, as L=4, PDCCH is made up of 4 CCE, and with reference to table 1, the PDCCH has 2 position candidates, namely Mw=2, each position candidate 4 CCE of correspondence, then the present embodiment after 12 CCE are offset, 8 CCE since the 13rd CCE (numbering is 12) to should PDCCH 2 position candidates.Pass through the method for the present embodiment, this 2 position candidates are mapped to by step-length of RB in corresponding two RB of physical time-frequency resource, the starting point of its position candidate will be mapped in corresponding 4th RB of the physical time-frequency resource, due to 4 CCE of each position candidate correspondence, therefore, a position candidate has just taken whole RB.
In the fig. 3 embodiment, numbering #1 ~ #6 RB is not necessarily continuous on corresponding physical time-frequency resource, for example, may also be discrete distribution as shown in Figure 2.Continuous numbering is given in figure 3, is that, in order to illustrate in different polywaters usually, the starting point of PDCCH position candidate is located in different RB.Below in an example, there is also identical situation, such as referred to as first RB (#1) of physical time-frequency resource, second RB (#2), the 3rd RB (#3), the 4th RB (#4), its implication is identical with Fig. 3 embodiment, no longer illustrates one by one.
In another embodiment, when for different polymerization levels, the starting point of PDCCH position candidate is located in identical RB, and for different RB, PDCCH alternate location mappings are in different RB during identical CCE ordinal positions：
CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space can be determined according to below equation:
mod(NCC£ m x mod(w', M( ) + L( _Xk I + \_m'l M( J) + i, NCCE) (3) wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration, it is a parameter for distinguishing start position of the different user in E-PDCCH resources, and its implication is as it was previously stated, will not be repeated here；I=0, L-1, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity. In order that the method for the embodiment is more clear understandable, the mapping method of the embodiment is illustrated by specific example below in conjunction with accompanying drawing.
Fig. 4 is the mapping schematic diagram of the PDCCH of one embodiment of the invention search space.The embodiment is with M(RB)=4, XkExemplified by=2, according to formula（3), it is possible to achieve mapping result as shown in Figure 4.
From unlike the mapping result shown in Fig. 2, the present embodiment is for the different horizontal 1^ of polymerization, and the starting point of PDCCH position candidate is located in identical RB.
Fig. 4 is refer to, as L=l, the starting point of PDCCH position candidate, namely the CCE that numbering is 2 are mapped in first RB of physical time-frequency resource.As L=2, the starting point of PDCCH position candidate, namely numbering is（4,5) CCE also is located in first RB of physical time-frequency resource.As L=4, the starting point of PDCCH position candidate, namely numbering is（8,9,10,11) CCE also is located in first RB of physical time-frequency resource.
In another embodiment, when for different polymerization levels, the starting point of PDCCH position candidate is located in different RB, and for different RB, when PDCCH alternate location mappings are to CCE ordinal positions different in different RB：
CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space can be determined according to below equation:
mod(NCC£ mx m.D (w', M(RB) ) + mod ( + m' + \ m' I M(RB) J), NCCE RB ) + i, NCCE) (4) wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration, it is a parameter for distinguishing start position of the different user in E-PDCCH resources, and its implication is as it was previously stated, will not be repeated here；I=0, L-1, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
In order that the method for the embodiment is more clear understandable, the mapping method of the embodiment is illustrated by specific example below in conjunction with accompanying drawing.
Fig. 5 is the mapping schematic diagram of the PDCCH of one embodiment of the invention search space.The embodiment is with M(RB)=4, XkExemplified by=2, according to formula（4), it is possible to achieve mapping result as shown in Figure 5.
From unlike the mapping result shown in Fig. 2, the present embodiment is for different RB, PDCCH alternate location mappings to different CCE ordinal positions.
From unlike the mapping result shown in Fig. 4, the present embodiment is for different polymerization levels, and the starting point of PDCCH position candidate is located in different RB, and for different RB, PDCCH alternate location mappings to different CCE ordinal positions.
Fig. 5 is refer to, as L=l, the starting point of PDCCH position candidate, namely the CCE mappings that numbering is 2 Into first RB of physical time-frequency resource, but, position of each position candidate of the PDCCH in each RB is different, for example, the CCE that numbering is 2 is located at first RB of physical time-frequency resource the 3rd CCE position, the CCE that numbering is 3 is located at second RB of physical time-frequency resource the 4th CCE position, the CCE that numbering is 4 is located at the 3rd RB of physical time-frequency resource first CCE position, the CCE that numbering is 5 is located at the 4th RB of physical time-frequency resource second CCE position, numbering is 6, after 7 CCE maps according to cyclic shift, the CCE that numbering is 6 is located at first RB of physical time-frequency resource the 4th CCE position, the CCE that numbering is 7 is located at second RB of physical time-frequency resource first CCE position.
Similarly, as L=2, the starting point of PDCCH position candidate, namely numbering is（4,5) CCE is located in second RB of physical time-frequency resource, however, position of each position candidate of the PDCCH in each RB is different.For example, numbering is（4,5) CCE is located at the 1st of second RB of physical time-frequency resource the, 2 CCE position, and numbering is（6,7) CCE is located at the 3rd of the 3rd RB of physical time-frequency resource the, 4 CCE position, and numbering is（8,9) CCE is located at the 1st of the 4th RB the, 2 CCE position, and numbering is（10,11) CCE is located at the 3rd of first RB of physical time-frequency resource the, 4 CCE position, and numbering is（12,13) CCE is located at the 3rd of second RB of physical time-frequency resource the, 4 CCE position, and numbering is（14,15) CCE is located at the 1st of the 3rd RB of physical time-frequency resource the, 2 CCE position.Wherein, due to 2 CCE of each position candidate correspondence, and a RB includes 4 CCE, therefore, as L=2, " position of PDCCH each position candidate in each RB is different " mentioned here refer to that position of continuous two position candidates in its respective RB is different.
Similarly, as L=4, the starting point of PDCCH position candidate, namely numbering is（8,9,10,11) CCE is located in the 3rd RB of physical time-frequency resource, and due to each position candidate 4 CCE of correspondence, and a RB includes 4 CCE, therefore, as L=4, the corresponding CCE of a position candidate has taken whole RB, in the absence of " position of PDCCH each position candidate in each RB is different ".
In another embodiment, when for different polymerization levels, the starting point of PDCCH position candidate is located in identical RB, and for different RB, when PDCCH alternate location mappings are to CCE ordinal positions different in different RB：
CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space can be determined according to below equation:
mod(NCC£ RB x mod(w', M(RB) ) + mod ( + w')/ 」 + [_w7 M(RB) J), NCCE RB ) + i, NCCE) (5) wherein, NCCE RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration, it is A parameter for distinguishing start position of the different user in E-PDCCH resources, its implication is as it was previously stated, will not be repeated here；I=0, L-1, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
In order that the method for the embodiment is more clear understandable, the mapping method of the embodiment is illustrated by specific example below in conjunction with accompanying drawing.
Fig. 6 is the mapping schematic diagram of the PDCCH of one embodiment of the invention search space.The embodiment be with
M(RB)=4, XkExemplified by=2, according to formula（5), it is possible to achieve mapping result as shown in Figure 6.
From unlike the mapping result shown in Fig. 2, the present embodiment is for different polymerization levels, and the starting point of PDCCH position candidate is located in identical RB, and for different RB, PDCCH alternate location mappings to different CCE ordinal positions.
From unlike the mapping result shown in Fig. 4, the present embodiment is for different RB, PDCCH alternate location mappings to different CCE ordinal positions.
From unlike the mapping result shown in Fig. 5, the present embodiment is for different polymerization levels, and the starting point of PDCCH position candidate is located in identical RB.
It refer to Fig. 6, as L=l, the starting point of PDCCH position candidate, namely the CCE that numbering is 2 are mapped in first RB of physical time-frequency resource, position of each position candidate of the PDCCH in each RB is similar with Fig. 5, in this description will be omitted.
Similarly, as L=2, the starting point of PDCCH position candidate, namely numbering is（4,5) CCE also is located in first RB of physical time-frequency resource, and the position of each position candidate of the PDCCH in each RB is similar with Fig. 5, in this description will be omitted.
Similarly, as L=4, the starting point of PDCCH position candidate, namely numbering is（8,9,10,11) CCE also is located in first RB of physical time-frequency resource.
In figure 2 above-Fig. 6 embodiment, for different subframes, the UE special parameters XkIt is variable.It can also be seen that if polymerization level is not more than the quantity that Channel Elements (CCE) are controlled in each RB, namely L≤4 in the embodiment more than, then all CCE of the PDCCH a position candidate are mapped in identical RB.
According to the method for the present embodiment, after by the corresponding running time-frequency resource in the search space of each of PDCCH alternate location mappings to distribution, inform the search space that UE is distributed RB configuration and in RB CCE sequence number, therefore, the method for the present embodiment can also comprise the following steps：
Step 103:It will be down control channel（PDCCH) in the RB configurations and RB of the search space of distribution CCE sequence number is sent to UE.
Thus, it is possible to reduce UE blind check number of times.In the present embodiment, it is not intended to limit sending method.For example, RB the and/or CCE sequence numbers of the UE can be configured by high-level signaling.
By the method for the embodiment of the present invention, by PDCCH different alternate location mappings to different RB, frequency selective scheduling gain is obtained, PDCCH transmission performance is which thereby enhanced.
Present invention also offers a kind of base station, as described in the following examples 2, because the principle that the base station solves problem is similar with the mapping method of the search space of the down control channel of embodiment 1, therefore its specific implementation may be referred to the implementation of the method for embodiment 1, and something in common is repeated no more.
Embodiment 2
The embodiments of the invention provide a kind of base station, the base station is used for the mapping for carrying out the search space of down control channel.Fig. 7 is the composition schematic diagram of the base station, refer to Fig. 7, the base station includes：
Determining unit 701, it is defined as down control channel according to resource distribution mode（PDCCH) the search space of distribution；
Map unit 702, each position candidate (candidate) of the PDCCH is mapped on the corresponding running time-frequency resource in the search space by it using resource block RB as interval.
In one embodiment,
Quantity M of the map unit 702 in the RB for the PDCCH search spaces distributed(RB)Not less than the quantity M of the position candidatewWhen, by the different RB of each alternate location mappings of the PDCCH to the corresponding running time-frequency resource in the search space.
In one embodiment,
Quantity M of the map unit 702 in the RB for the PDCCH search spaces distributed(RB)Less than the quantity M of the position candidatewWhen, first by the M of the PDCCH(RB)Individual alternate location mappings are in the different RB of the corresponding running time-frequency resource in the search space, according still further to the mode of cyclic shift, by the different RB of remaining alternate location mappings to the corresponding running time-frequency resource in the search space.
In the foregoing embodiments, for different polymerization levels, the starting point of the position candidate of the PDCCH is mapped in different RB by the map unit, or is mapped in identical RB.
In the foregoing embodiments, for different RB, the map unit is by the different CCE of each alternate location mappings of the PDCCH to each RB position, or is mapped on each RB identical CCE position. In one embodiment, when for different polymerization levels, the starting point of the position candidate of the PDCCH is mapped in different RB by the map unit, and for different RB, when the map unit is by the identical CCE of each alternate location mappings of the PDCCH to each RB position, the map unit 702 can determine CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space according to below equation:
mod(NCC£ ^ X mod(w', M( ) + L(Xk + [m I M( J) + i, NCCE)；
Wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration；I=0, L-l, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
In one embodiment, when for different polymerization levels, the starting point of the position candidate of the PDCCH is mapped in different RB by the map unit, and for different RB, when the map unit is by the identical CCE of each alternate location mappings of the PDCCH to each RB position, the map unit 702 can also determine CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space according to below equation:
L{mod(((NCC£ /∑])}+ i；
Wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration；I=0, L-l, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
In one embodiment, when for different polymerization levels, the starting point of the position candidate of the PDCCH is mapped in different RB by the map unit, and for different RB, when the map unit is by the different CCE of each alternate location mappings of the PDCCH to each RB position, the map unit 702 can determine CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space according to below equation:
mod(NCC£ m x mod(w', M(RB) ) + mod(L(Xk + m' + [m I M(RB) J), NCCE NCCE)；Wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration；I=0, L-l, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
In one embodiment, when for different polymerization levels, the starting point of the position candidate of the PDCCH is mapped in identical RB by the map unit, and for different RB, when the map unit is by the identical CCE of each alternate location mappings of the PDCCH to each RB position, the map unit 702 can determine CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space according to below equation: mod(NCC£ m x mod(w', M(RB) ) + L([_Xk I + \_m' l M(RB) J) + i, NCCE)；Wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration；I=0, L-l, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
In one embodiment, when for different polymerization levels, the starting point of the position candidate of the PDCCH is mapped in identical RB by the map unit, and for different RB, when the map unit is by the different CCE of each alternate location mappings of the PDCCH to each RB position, the map unit 702 can determine CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space according to below equation:
mod(NCC£ RB x od(m',M(RB)) + ηιοά(ζ([( Α + m')/ NCCE RB ) + i, NCCE)；Wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration；I=0, L-l, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
In the foregoing embodiments, if polymerization level is not more than control Channel Elements in each RB（CCE quantity), then all CCE of the PDCCH a position candidate be mapped in identical RB.
In the foregoing embodiments, for different subframes, UE special parameters XkIt is variable.
In one embodiment, the base station can also include：
Transmitting element 703, it will be down control channel（PDCCH) the RB configurations of the search space of distribution and the sequence number of CCE in RB are sent to UE.
By the base station of the present embodiment, by PDCCH different alternate location mappings to corresponding RB, frequency selective scheduling gain can be obtained, PDCCH transmission performance is which thereby enhanced.
The embodiment of the present invention additionally provides a kind of computer-readable program, wherein, when performing the program in a base station, the program causes computer to perform the mapping method of the search space of the down control channel described in embodiment 1 in the base station.
The embodiment of the present invention additionally provides a kind of storage medium for the computer-readable program that is stored with, wherein, the computer-readable program causes computer to perform the mapping method of the search space of the down control channel described in embodiment 1 in a base station.
Apparatus and method more than of the invention can be realized by hardware, can also be realized by combination of hardware software.The present invention relates to such computer-readable program, when the program is performed by logical block, the logical block can be made to realize devices described above or component parts, or the logical block is realized various methods or step described above.Logical block is such as the processor used in field programmable logic part, microprocessor, computer.The invention further relates to Storage medium for storing procedure above, such as hard disk, disk, CD, DVD, flash memory.Above in association with specific embodiment, invention has been described, it will be appreciated by those skilled in the art that these descriptions are all exemplary, it is not limiting the scope of the invention.Those skilled in the art can make various variants and modifications to the present invention according to spirit and principles of the present invention, and these variants and modifications are also within the scope of the invention.

Claims (26)

  1. Claims
    1st, a kind of mapping method of the search space of down control channel, wherein, methods described includes：Down control channel is defined as according to resource distribution mode（PDCCH) the search space of distribution；With resource block（RB it is) interval, by each position candidate of the PDCCH（Candidate) it is mapped on the corresponding running time-frequency resource in the search space.
    2nd, according to the method described in claim 1, wherein,
    If the RB of the PDCCH search spaces distributed quantity M(RB)Not less than the quantity Μ of the position candidate(ΙThen by the different RB of each alternate location mappings of the PDCCH to the corresponding running time-frequency resource in the search space.
    3rd, according to the method described in claim 1, wherein,
    If the RB of the PDCCH search spaces distributed quantity M(RB)Less than the quantity M of the position candidate(L), then first by the M of the PDCCH(RB)Individual alternate location mappings are in the different RB of the corresponding running time-frequency resource in the search space, according still further to the mode of cyclic shift, by the different RB of remaining alternate location mappings to the corresponding running time-frequency resource in the search space.
    4th, according to the method described in claim 1, wherein,
    If polymerization level is not more than control Channel Elements in each RB（CCE quantity), then all CCE of the PDCCH a position candidate be mapped in identical RB.
    5th, the method according to Claims 1-4 any one, wherein,
    For different polymerization levels, the starting point of the position candidate of the PDCCH is located in different RB.
    6th, method according to claim 5, wherein, each position candidate for the PDCCH being mapped in different RB, the position of the CCE on the different RB is identical or difference.
    7th, method according to claim 6, wherein, when each position candidate for the PDCCH being mapped in different RB, when the position of CCE on the different RB is identical, CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space is determined according to below equation:
    mod(NCC£ mX mod (w', M( ) + L(Xk + [m' / M( J) + i, NCCE)；
    Wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration；I=0 ..., L-l, L are polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
    8th, method according to claim 6, wherein, when the PDCCH's being mapped in different RB Each position candidate, when the position of the CCE on the different RB is identical, CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space is determined according to below equation:
    L {mod(((NCC£ /L])}+ i ;
    Wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration；I=0 ..., L-l, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
    9th, method according to claim 6, wherein, when each position candidate for the PDCCH being mapped in different RB, when the position of the CCE on the different RB is different, according to being determined below equation
    CCE of PDCCH m-th of the position candidate on the corresponding running time-frequency resource in the search space:
    mod(NCC£ mx m.D (w', M(RB) ) + mod ( (¾ + m' + \ m'l M J), NCCE NCCE) ；Wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration；I=0 ..., L-l, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
    10th, the method according to Claims 1-4 any one, wherein,
    For different polymerization levels, the starting point of the position candidate of the PDCCH is located in identical RB.
    11st, method according to claim 10, wherein, each position candidate for the PDCCH being mapped in different RB, the position of the CCE on the different RB is identical or difference.
    12nd, method according to claim 11, wherein, when each position candidate for the PDCCH being mapped in different RB, when the position of the CCE on the different RB is identical, according to being determined below equation
    CCE of PDCCH m-th of the position candidate on the corresponding running time-frequency resource in the search space:
    mod(NCC£ + [m I M(RB) J) + i, NCCE)；
    Wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration；I=0 ..., L-l, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
    13rd, method according to claim 11, wherein, when each position candidate for the PDCCH being mapped in different RB, when the position of the CCE on the different RB is different, according to being determined below equation
    CCE of PDCCH m-th of the position candidate on the corresponding running time-frequency resource in the search space:
    mod(NCC£ RB x od(m',M(RB)) + ηιοά(ζ([( 4 + w')/ 」 + [_ 7 J),NCC£ RB) + i,NCCE) ；Wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration；I=0 ..., L-l, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
    14th, the method according to claim 7 or 8 or 9 or 12 or 13, wherein,
    For different subframes, the UE special parameters XkIt is variable. 15th, according to the method described in claim 1, wherein, methods described also includes：
    It will be down control channel（PDCCH) the RB configurations of the search space of distribution and the sequence number of CCE in RB are sent to UE.
    16th, a kind of base station, it is used for the mapping for carrying out the search space of down control channel, wherein, the base station includes：
    Determining unit, it is defined as down control channel according to resource distribution mode（PDCCH) the search space of distribution；Map unit, it is using resource block RB as interval, by each position candidate of the PDCCH（Candidate) it is mapped on the corresponding running time-frequency resource in the search space.
    17th, base station according to claim 16, wherein,
    Quantity M of the map unit in the RB for the PDCCH search spaces distributed(RB)Not less than the quantity M of the position candidatewWhen, by the different RB of each alternate location mappings of the PDCCH to the corresponding running time-frequency resource in the search space.
    18th, base station according to claim 16, wherein,
    Quantity M of the map unit in the RB for the PDCCH search spaces distributed(RB)Less than the quantity M of the position candidatewWhen, first by the M of the PDCCH(RB)Individual alternate location mappings are in the different RB of the corresponding running time-frequency resource in the search space, according still further to the mode of cyclic shift, by the different RB of remaining alternate location mappings to the corresponding running time-frequency resource in the search space.
    19th, the base station according to claim 16 to 18 any one, wherein,
    For different polymerization levels, the starting point of the position candidate of the PDCCH is mapped in different RB by the map unit.
    20th, base station according to claim 19, wherein, each position candidate for the PDCCH being mapped in different RB, the position of the CCE on the different RB is identical or difference.
    21st, base station according to claim 20, wherein, when each position candidate for the PDCCH being mapped in different RB, when the position of CCE on the different RB is identical, the map unit determines CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space according to below equation:
    mod(NCC£ mX mod (w', M( ) + L(Xk + [m' / M( J) + i, NCCE)；
    Wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration；I=0 ..., L-l, L are polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
    22nd, base station according to claim 20, wherein, as the PDCCH being mapped in different RB Each position candidate, when the position of the CCE on the different RB is identical, the map unit determines CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space according to below equation:
    L {mod(((NCC£ /L])}+ i ;
    Wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration；I=0 ..., L-l, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
    23rd, base station according to claim 20, wherein, when each position candidate for the PDCCH being mapped in different RB, when the position of CCE on the different RB is different, the map unit determines CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space according to below equation: mod(NCC£ mx m.D (w', M(RB) ) + mod ( (¾ + m' + \ m'l M J), NCCE NCCE)；Wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration；I=0 ..., L-l, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
    24th, the base station according to claim 16 to 18 any one, wherein,
    For different polymerization levels, the starting point of the position candidate of the PDCCH is mapped in identical RB by the map unit.
    25th, base station according to claim 24, wherein, each position candidate for the PDCCH being mapped in different RB, the position of the CCE on the different RB is identical or difference.
    26th, base station according to claim 25, wherein, when each position candidate for the PDCCH being mapped in different RB, when the position of CCE on the different RB is identical, the map unit determines CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space according to below equation: mod(NCC£ mX mod (w', M( ) + L( _Xk I + [m I M(RB) J) + i, NCCE)；
    Wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration；I=0 ..., L-l, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
    27th, base station according to claim 25, wherein, when each position candidate for the PDCCH being mapped in different RB, when the position of CCE on the different RB is different, the map unit determines CCE of m-th of the position candidate of the PDCCH on the corresponding running time-frequency resource in the search space according to below equation: mod(NCC£ RB x m。d( ',M(M)) + od(L( (Xk + ')/ 」 + [_»ί7Μ(ί5) J),NCC£ RB ) + i,NCCE)；Wherein, NCCE— RBIt is the quantity of CCE in a RB； XkIt is the UE special parameters of high-rise configuration；I=0 ..., L-l, L is polymerization level, NCCEIt is for the E-PDCCH CCE configured total quantity.
    28th, base station according to claim 16, wherein, the base station also includes： Transmitting element, it will be down control channel（PDCCH) the RB configurations of the search space of distribution and the sequence number of CCE in RB are sent to UE.
    29th, a kind of computer-readable program, wherein, when performing the program in a base station, the program causes computer perform claim in the base station to require the mapping method of the search space of the down control channel described in any one of 1-15.
    30th, a kind of storage medium for the computer-readable program that is stored with, wherein, the computer-readable program causes the mapping method of the search space of down control channel of the computer in a base station described in perform claim requirement any one of 1-15.
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