CN103813389A - Method and device for determining distribution of EPDCCH (Enhanced Physical Downlink Control Channel) candidates - Google Patents

Method and device for determining distribution of EPDCCH (Enhanced Physical Downlink Control Channel) candidates Download PDF

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CN103813389A
CN103813389A CN201210489394.2A CN201210489394A CN103813389A CN 103813389 A CN103813389 A CN 103813389A CN 201210489394 A CN201210489394 A CN 201210489394A CN 103813389 A CN103813389 A CN 103813389A
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epdcch
candidate
collection
polymerization grade
distributed
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刘铮
蒋琦
马修·贝克
黄晟峰
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Nokia Shanghai Bell Co Ltd
Alcatel Lucent SAS
Alcatel Optical Networks Israel Ltd
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Alcatel Lucent Shanghai Bell Co Ltd
Alcatel Optical Networks Israel Ltd
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Abstract

The invention relates to a method and a device for determining the distribution of EPDCCH (Enhanced Physical Downlink Control Channel) candidates in one or more EPDCCH sets. The method comprises the steps of: A, obtaining EPDCCH configuration and a subframe structure, wherein the EPDCCH configuration comprises KD, KL, NDi, NLj, i is equal to 1...KD, j is equal to 1... KL, KD and KL respectively are the quantities of distributed EPDCCH sets and localised EPDCCH sets, NDi and NLj respectively are the quantity of PRB (Physical Resource Block) pairs included in the i-th distributed EPDCCH set and the j-th localised EPDCCH set; B, according to the EPDCCH configuration, the subframe structure and correspondence between each of the EPDCCH configuration and the subframe structure and the distribution of the EPDCCH candidates, determining the distribution of EPDCCH candidate and q is equal to 1...Q, wherein Q is the quantity of available aggregation levels corresponding to the subframe structure, and the quantity of EPDCCH candidates with the aggregation level of ALq in the i-th distributed EPDCCH set and the j-th localised EPDCCH set, ALq is the q-th aggregation level in the available aggregation levels, and the sum is the nonnegative positive integer power of 0 or 2.

Description

Be used for the method and apparatus of the distribution of determining EPDCCH candidate
Technical field
The present invention relates to Physical Downlink Control Channel (the PhysicalDownlink Control Channel in cordless communication network, PDCCH), relate in particular to the method and apparatus of the distribution for determining enhancement mode Physical Downlink Control Channel (Enhanced PDCCH, EPDCCH) candidate.
Background technology
At 3GPP-LTE (the 3 rdgeneration Partnership Project Long TermEvolution) in version 11, introduce EPDCCH.Than traditional PDCCH, EPDCCH is intended to obtain larger dispatching and higher spectrum efficiency.Be similar to traditional PDCCH, the basic resource unit of EPDCCH is defined as to enhancement mode control channel unit (Enhanced Control Channel Element, ECCE).Multiple ECCE can be according to different polymerization grade (Aggregation Level, AL) condense together to support link circuit self-adapting (Link Adaptation) transmission of Downlink Control Information (Downlink ControlInformation, DCI).For EPDCCH polymerization grade, in 3GPP RAN1#70 meeting, reach following agreement.
First,, for different subframe (subframe) structure, available polymerization grade may be different.Particularly, to use standard cyclic prefix (cyclic prefix in subframe, CP) normal sub-frames or use the Resource Unit (Resource Element, RE) that 3,4,8 special subframe and each PRB centering can use that is configured to of standard C P to be less than X thresh(working hypothesis is X thresh=104) in situation, for centralized (localised) transmission means, available polymerization grade comprises 2,4,8,16 (working hypothesis as feasible in search volume is 16), for distributed (distributed) transmission means, available polymerization grade comprises 2,4,8,16,32 (working hypothesis as feasible in search volume is 32); In other cases, for localized transmission mode, available polymerization grade comprises 1,2,4,8 (working hypothesis as feasible in search volume is 8), for distributed transmission mode, available polymerization grade comprises 2,4,8,16 (working hypothesis as feasible in search volume is 16).
Secondly, for each carrier component (Component Carrier, CC), the total degree of the blind decoding (blind decode) of EPDCCH user equipment specific search volume (UE-Specific Search Space, USS) was 32 or 48 (depending on the configuration of up multiple-input and multiple-output ULMIMO).
In addition, also introduced this concept of EPDCCH collection.EPDCCH collection is defined as one group of N Physical Resource Block (Physical Resource Block, PRB) right, the quantity of distributing to the EPDCCH collection (hereinafter referred to as centralized EPDCCH collection) of localized transmission mode is respectively KL and KD with the quantity of the EPDCCH collection (hereinafter referred to as distributed EPDCCH collection) of distributing to distributed transmission mode.For N, KL, KD, in 3GPP RAN1#70bis meeting, reach following agreement: the total quantity of EPDCCH collection is not more than 2, KL and KD have following combination: { KL=1, KD=0}, { KL=0, KD=1}, { KL=1, KD=1}, { KL=0, KD=2}, { KL=2, KD=0}; N is 2,4 or 8.
In blind check process, subscriber equipment will carry out blind decoding to EPDCCH detected to each EPDCCH candidate (EPDCCHCandidate) successively.Correspondingly, the distribution of EPDCCH candidate in each EPDCCH collection and each polymerization grade, each EPDCCH concentrates the EPDCCH candidate's of each polymerization grade quantity, will affect the performance of blind check.Therefore, EPDCCH candidate need to be distributed in suitably in each EPDCCH collection and each polymerization grade.
Summary of the invention
For above-mentioned technical problem, the object of the present invention is to provide the method and apparatus of a kind of definite EPDCCH candidate's distribution, to obtain higher blind check performance, such as dispatching flexibility (scheduling flexibility), blocking rate (blocking probability), scheduling time delay (scheduling delay) etc.
According to an aspect of the present invention, provide a kind of for determining the EPDCCH candidate's concentrated at one or more enhancement mode Physical Downlink Control Channel EPDCCH the method for distribution.Described EPDCCH collection is distributed EPDCCH collection or centralized EPDCCH collection.Said method comprising the steps of:
A. obtain EPDCCH configuration and subframe structure, described EPDCCH configuration comprises KD, KL, ND i, NL j, i=1...KD, j=1...KL, wherein, KD is the quantity that described one or more EPDCCH concentrates distributed EPDCCH collection, KL is the quantity that described one or more EPDCCH concentrates centralized EPDCCH collection, ND ii the right quantity of Physical Resource Block PRB that distributed EPDCCH collection comprises, NL jj the right quantity of PRB that centralized EPDCCH collection comprises, ND i, NL jand in described subframe structure, each PRB is all 2 positive integer time power to the amount R of comprised enhancement mode control channel unit ECCE; And
B. according to described EPDCCH configuration, described subframe structure and the predetermined corresponding relation between described EPDCCH configuration and described subframe structure and EPDCCH candidate's distribution, determine described EPDCCH candidate's distribution
Figure BDA00002467405600031
with
Figure BDA00002467405600032
q=1...Q, Q is the quantity corresponding to the available polymerization grade of described subframe structure,
Figure BDA00002467405600033
that i the concentrated polymerization grade of distributed EPDCCH is AL qePDCCH candidate's quantity,
Figure BDA00002467405600034
that j the concentrated polymerization grade of centralized EPDCCH is AL qePDCCH candidate's quantity, AL qq polymerization grade in described available polymerization grade, AL qbe 2 nonnegative integer time power and increase progressively i.e. AL 1< ... < AL q;
Wherein,
Figure BDA00002467405600035
with
Figure BDA00002467405600036
be 0 or 2 non-negative positive integer time power.
According to the present invention, the right quantity ND of PRB that each EPDCCH is concentrated iand NL jand each PRB is 2 positive integer time power to the amount R of comprised ECCE, available polymerization grade is 2 nonnegative integer time power.
For example, according to the agreement of 3GPP, the concentrated right quantity of PRB of each EPDCCH is 2,4 or 8, and each PRB is 2 or 4 to the quantity of comprised ECCE, thereby the quantity of the concentrated ECCE of each EPDCCH is 2,4,8,16 or 32, and it is all 2 positive integer time power.And available polymerization grade is 1,2,4,8 and 16, it is all 2 nonnegative integer time power.
In the distribution of the determined EPDCCH candidate according to the present invention, each EPDCCH concentrates the EPDCCH candidate's of each polymerization grade quantity
Figure BDA00002467405600037
with
Figure BDA00002467405600038
0 or 2 non-negative positive integer time power.Thus, the tree of EPDCCH (tree structure) is similar with the tree of traditional PDCCH, thereby can simplify search volume design.Fig. 1 shows the tree of EPDCCH.In Fig. 1 (a), the right quantity N of PRB that EPDCCH collection comprises is 2, and each PRB is 4 to the amount R of comprised ECCE.In Fig. 1 (b), the right quantity N of PRB that EPDCCH collection comprises is 4, and each PRB is 4 to the amount R of comprised ECCE.As shown in Figure 1, the EPDCHH candidate in each polymerization grade can all PRB of EPDCCH collection on be uniformly distributed and can not produce resource in candidate mappings and fall tail (resource tail), thereby avoided resource fragmentation.For example, EPDCCH collection comprise 8 PRB to, each PRB to comprising under 4 ECCE situation that this EPDCCH collection comprises 32 ECCE, if distribute 6 EPDCCH candidates that polymerization grade is 2, in the time not allowing to occur falling tail ECCE, will cause so EPDCCH candidate cannot be evenly distributed on 32 ECCE, this may be unfavorable for frequency selective scheduling.Otherwise, if the EPDCCH candidate's who distributes quantity is 2 nonnegative integer time power, there will not be this problem.In addition, based on the tree structure shown in Fig. 1, different EPDCCH concentrate and different polymerization grades on the EPDCCH candidate placement of can aliging better, this is conducive to reduce blocking rate.
According to a specific embodiment of the present invention, described EPDCCH candidate's total quantity
Figure BDA00002467405600041
be less than or equal to first threshold M thresh, described first threshold M threshbe 2 positive integer time power; And
Described EPDCCH candidate's total quantity is more than or equal to min (A, M thresh-1), wherein A is the maximum of the EPDCCH candidate's of all polymerization grades that can carry of described one or more EPDCCH collection quantity,
Figure BDA00002467405600042
Wherein, ND ibe i the right quantity of Physical Resource Block PRB that distributed EPDCCH collection comprises, R is the quantity of each PRB to comprised ECCE, and each polymerization grade is AL qePDCCH candidate need to be by AL qindividual ECCE carries, therefore ND iwith the product of R divided by AL qand round downwards and obtain i distributed EPDCCH and integrate the polymerization grade that can carry as AL qePDCCH candidate's quantity.Similarly, NL jwith the product of R divided by AL qand round downwards and obtain j centralized EPDCCH and integrate the polymerization grade that can carry as AL qePDCCH candidate's quantity.
According to this embodiment, EPDCCH candidate's total quantity is less than or equal to first threshold M thresh.
For example, according to the agreement of 3GPP, for each carrier component, the total degree of the blind decoding of EPDCCH user equipment specific search volume was 32 or 48 (specifically depending on the configuration of UL MIMO), and the number of times of the blind decoding that each EPDCCH candidate needs 2 or 3 times (specifically also depending on the configuration of UL MIMO), EPDCCH candidate's total quantity can not exceed 16 thus, i.e. first threshold M thresh=16.
According to this embodiment, as long as long as be no more than first threshold and have enough resources, just concentrate at described one or more EPDCCH the EPDCCH candidate as much as possible that distributes.Distribute EPDCCH candidate as much as possible can lower blocking rate, this is because than the random schedule based on Hash function, and among each candidate, dynamic dispatching EPDCCH can avoid blocking preferably.In addition,, by the more EPDCCH candidate that distributes, the frequency selectivity gain that localized transmission obtains also can be improved.For example, EPDCCH collection comprise 8 PRB to, each PRB to comprising under 4 ECCE situation that this EPDCCH collection comprises 32 ECCE, than distributing 4 EPDCCH candidates that polymerization grade is 1, distribute the EPDCCH candidate that 8 polymerization grades are 1 to provide more option for the frequency selective scheduling of EPDCCH, thereby likely EPDCCH is dispatched to better frequency band.
According to a specific embodiment of the present invention, any two EPDCCH collection that any two EPDCCH collection of concentrating for described distributed EPDCCH or described centralized EPDCCH concentrate, if the right quantity of PRB that the EPDCCH collection that described two EPDCCH concentrate comprises is not less than the right quantity of PRB that another concentrated EPDCCH collection of described two EPDCCH comprises, the EPDCCH candidate's of all polymerization grades that a described EPDCCH concentrates quantity is not less than the EPDCCH candidate's of the concentrated all polymerization grades of described another EPDCCH quantity,
For i1, { KD>=2, if ND for 1...KD}, i1 ≠ i2 for i2 ∈ i1>=ND i2, &Sigma; q = 1 Q MD i 1 q &GreaterEqual; &Sigma; q = 1 Q MD i 2 q , And
For j1, { KL>=2, if NL for 1...KL}, j1 ≠ j2 for j2 ∈ j1>=NL j2, &Sigma; q = 1 Q ML j 1 q &GreaterEqual; &Sigma; q = 1 Q ML j 2 q .
Thus, the EPDCCH with more resource (being ECCE) concentrates EPDCCH candidate's quantity also more, EPDCCH candidate comparatively can be evenly distributed in thus to each EPDCCH concentrates, this can improve frequency diversity (frequency diversity), thereby is conducive to localized transmission and distributed transmission.Further, can also make each EPDCCH pooling of resources number close even identical as much as possible with the ratio of EPDCCH number of candidates.Certainly,, because number of resources and EPDCCH number of candidates are all powers of 2, this ratio that is therefore in general difficult to each EPDCCH is concentrated is identical.
According to a specific embodiment of the present invention, the EPDCCH candidate's of all described available polymerization grade that all described centralized EPDCCH concentrate quantity is greater than all described available polymerization grade EPDCCH candidate's of all described distributed EPDCCH collection quantity,
&Sigma; j = 1 NL &Sigma; q = 1 Q ML j q > &Sigma; i = 1 ND &Sigma; q = 1 Q MD i q .
Concentrate the more EPDCCH candidate that distributes to provide more option for frequency selective scheduling at centralized EPDCCH, thereby improve the efficiency of transmission of EPDCCH.
According to a specific embodiment of the present invention, it is AL that i distributed EPDCCH concentrates polymerization grade qePDCCH candidate's quantity
Figure BDA00002467405600062
be less than or equal to this distributed EPDCCH and integrate the polymerization grade that can carry as AL qePDCCH candidate's maximum quantity, and j centralized EPDCCH to concentrate polymerization grade be AL qePDCCH candidate's quantity be less than or equal to this centralized EPDCCH and integrate the polymerization grade that can carry as AL qePDCCH candidate's maximum quantity,
Figure BDA00002467405600064
And
Thus, can guarantee that the number of resources that each EPDCCH collection comprises (being the quantity of comprised ECCE) is enough to the EPDCCH candidate that carrying distributes.
According to a specific embodiment of the present invention, determined EPDCCH candidate's distribution meets:
Figure BDA00002467405600066
and
Figure BDA00002467405600067
In other words, concentrating at each EPDCCH, is at least one EPDCCH candidate of each polymerization distribution of grades, unless the number of resources of this EPDCCH collection is not enough to carry the EPDCCH candidate of this polymerization grade.Thus, each EPDCCH concentrates, and EPDCCH candidate's polymerization grade is all many as much as possible, and this is conducive to link circuit self-adapting.
According to another specific embodiment of the present invention,
Figure BDA00002467405600068
i=1...KD, q=Q, and
Figure BDA00002467405600071
In other words, concentrating at each EPDCCH, as long as there are enough resources to carry, is just the highest polymerization grade AL qdistribute at least 2 EPDCCH candidates.
According to a specific embodiment of the present invention, for two different EPDCCH configuration and subframe structures, if the concentrated right quantity of PRB of described distributed EPDCCH is identical under described two different EPDCCH configurations, and the quantity that the concentrated PRB of described centralized EPDCCH is right is also identical under described two different EPDCCH configurations, two EPDCCH candidates' that determine according to described two different EPDCCH configurations and described subframe structure so respectively distribution is not identical.
According to this embodiment, for two different EPDCCH configurations, although the quantity difference of EPDCCH collection, but all EPDCCH concentrate that to have the total quantity that the PRB of identical traffic mode (being centralized or distributed) is right identical, make corresponding two EPDCCH candidates' distribution not identical.Thus, can provide more more options for EPDCCH scheduling.For example, therein in an EPDCCH candidate's distribution, for higher polymerization grade is distributed more EPDCCH candidate, to be more suitable for serving the subscriber equipment of neighbor base station (being positioned at center of housing estate), and in another EPDCCH candidate's distribution, for lower polymerization grade is distributed more EPDCCH candidate, to be more suitable for the subscriber equipment of service away from base station (being positioned at cell edge).
According to a specific embodiment of the present invention, the total quantity of described one or more EPDCCH collection is less than or equal to 2, i.e. KD+KL≤2.
According to a specific embodiment of the present invention, the right quantity of PRB that each EPDCCH collection that described one or more EPDCCH concentrate comprises is 2,4 or 8, i.e. ND i∈ { 2,4,8}, i=1...KD, and NL j∈ { 2,4,8}, j=1...KL.
According to an aspect of the present invention, provide a kind of for determining the EPDCCH candidate's concentrated at one or more enhancement mode Physical Downlink Control Channel EPDCCH the device of distribution, wherein, described EPDCCH collection is distributed EPDCCH collection or centralized EPDCCH collection, and described device comprises:
Acquiring unit, it is for obtaining EPDCCH configuration and subframe structure, and described EPDCCH configuration comprises KD, KL, ND i, NL j, i=1...KD, j=1...KL, wherein, KD is the quantity that described one or more EPDCCH concentrates distributed EPDCCH collection, KL is the quantity that described one or more EPDCCH concentrates centralized EPDCCH collection, ND ii the right quantity of Physical Resource Block PRB that distributed EPDCCH collection comprises, NL jj the right quantity of PRB that centralized EPDCCH collection comprises, ND i, NL jand in described subframe structure, each PRB is 2 positive integer time power to the amount R of comprised enhancement mode control channel unit ECCE; And
Determining unit, it,, for according to described EPDCCH configuration, described subframe structure and the predetermined corresponding relation between described EPDCCH configuration and described subframe structure and EPDCCH candidate's distribution, determines described EPDCCH candidate's distribution
Figure BDA00002467405600081
with
Figure BDA00002467405600082
q=1...Q, Q is the quantity corresponding to the available polymerization grade of described subframe structure,
Figure BDA00002467405600083
that i the concentrated polymerization grade of distributed EPDCCH is AL qePDCCH candidate's quantity,
Figure BDA00002467405600084
that j the concentrated polymerization grade of centralized EPDCCH is AL qePDCCH candidate's quantity, AL qq polymerization grade in described available polymerization grade, AL qbe 2 nonnegative integer time power and increase progressively i.e. AL 1< ... < AL q;
Wherein, with
Figure BDA00002467405600086
be 0 or 2 non-negative positive integer time power.
According to an aspect of the present invention, provide a kind of base station, it comprises above-mentioned for determining the EPDCCH candidate's concentrated at one or more enhancement mode Physical Downlink Control Channel EPDCCH the device of distribution.
According to an aspect of the present invention, provide a kind of subscriber equipment, it comprises above-mentioned for determining the EPDCCH candidate's concentrated at one or more enhancement mode Physical Downlink Control Channel EPDCCH the device of distribution.
Utilize the solution of the present invention, can improve the blind check performance of EPDCCH, such as improving dispatching flexibility (scheduling flexibility), blocking rate (blocking probability), scheduling time delay (scheduling delay) etc.
Accompanying drawing explanation
By reading the following detailed description to non-limiting example with reference to accompanying drawing, it is more obvious that other features, objects and advantages of the present invention will become.
Fig. 1 shows according to the tree of the EPDCCH of a specific embodiment of the present invention;
Fig. 2 shows according to the flow chart of the method for a specific embodiment of the present invention.
Embodiment
According to a specific embodiment of the present invention, provide a kind of for determining the EPDCCH candidate's concentrated at one or more enhancement mode Physical Downlink Control Channel EPDCCH the method for distribution.
According to another specific embodiment of the present invention, provide a kind of for determining the EPDCCH candidate's concentrated at one or more enhancement mode Physical Downlink Control Channel EPDCCH the device of distribution, it comprises acquiring unit and determining unit.
Fig. 2 shows according to the flow chart of the method for a specific embodiment of the present invention.
With reference to Fig. 2, in step S201, acquiring unit obtains EPDCCH configuration and subframe structure, and described EPDCCH configuration comprises KD, KL, ND i, NL j, i=1...KD, j=1...KL, wherein, KD is the quantity that described one or more EPDCCH concentrates distributed EPDCCH collection, KL is the quantity that described one or more EPDCCH concentrates centralized EPDCCH collection, ND ii the right quantity of Physical Resource Block PRB that distributed EPDCCH collection comprises, NL jj the right quantity of PRB that centralized EPDCCH collection comprises.
In step S202, according to described EPDCCH configuration, described subframe structure and the predetermined corresponding relation between described EPDCCH configuration and described subframe structure and EPDCCH candidate's distribution, determining unit is determined described EPDCCH candidate's distribution with
Figure BDA00002467405600092
q=1...Q, Q is the quantity corresponding to the available polymerization grade of described subframe structure, that i the concentrated polymerization grade of distributed EPDCCH is AL qePDCCH candidate's quantity,
Figure BDA00002467405600094
that j the concentrated polymerization grade of centralized EPDCCH is AL qePDCCH candidate's quantity, AL qq polymerization grade in described available polymerization grade.
According to a specific embodiment of the present invention, determined EPDCCH candidate's distribution meets at least one in the following:
(1)
Figure BDA00002467405600095
with
Figure BDA00002467405600096
be 0 or 2 non-negative positive integer time power.
(2) described EPDCCH candidate's total quantity
Figure BDA00002467405600097
be less than or equal to first threshold M thresh, described first threshold M threshbe 2 positive integer time power; And
Described EPDCCH candidate's total quantity is more than or equal to min (A, M thresh-1), wherein A is the maximum of the EPDCCH candidate's of all polymerization grades that can carry of described one or more EPDCCH collection quantity,
Figure BDA00002467405600101
(3) any two EPDCCH collection that any two EPDCCH collection of concentrating for described distributed EPDCCH or described centralized EPDCCH concentrate, if the right quantity of PRB that the EPDCCH collection that described two EPDCCH concentrate comprises is not less than the right quantity of PRB that another concentrated EPDCCH collection of described two EPDCCH comprises, the EPDCCH candidate's of all polymerization grades that a described EPDCCH concentrates quantity is not less than the EPDCCH candidate's of the concentrated all polymerization grades of described another EPDCCH quantity,
For i1, { KD>=2, if ND for 1...KD}, i1 ≠ i2 for i2 ∈ i1>=ND i2, &Sigma; q = 1 Q MD i 1 q &GreaterEqual; &Sigma; q = 1 Q MD i 2 q , And
For j1, { KL>=2, if NL for 1...KL}, j1 ≠ j2 for j2 ∈ j1>=NL j2, &Sigma; q = 1 Q ML j 1 q &GreaterEqual; &Sigma; q = 1 Q ML j 2 q .
(4) the EPDCCH candidate's of all described available polymerization grade that all described centralized EPDCCH concentrate quantity is greater than all described available polymerization grade EPDCCH candidate's of all described distributed EPDCCH collection quantity,
&Sigma; j = 1 NL &Sigma; q = 1 Q ML j q > &Sigma; i = 1 ND &Sigma; q = 1 Q MD i q .
It is AL that (5) i distributed EPDCCH concentrate polymerization grade qePDCCH candidate's quantity
Figure BDA00002467405600105
be less than or equal to this distributed EPDCCH and integrate the polymerization grade that can carry as AL qePDCCH candidate's maximum quantity, and j centralized EPDCCH to concentrate polymerization grade be AL qePDCCH candidate's quantity
Figure BDA00002467405600106
be less than or equal to this centralized EPDCCH and integrate the polymerization grade that can carry as AL qePDCCH candidate's maximum quantity,
Figure BDA00002467405600107
and
Figure BDA00002467405600108
(6)
Figure BDA00002467405600111
and
Figure BDA00002467405600112
(7)
Figure BDA00002467405600113
and
Figure BDA00002467405600114
Predetermined corresponding relation between described EPDCCH configuration and described subframe structure and EPDCCH candidate's distribution can be implemented in every way.For example, this corresponding relation can be pre-stored in corresponding device with the form of form.
Form 1 is according to the form of this corresponding relation of expression of a specific embodiment of the present invention.Wherein, EPDCCH configuration, subframe structure and corresponding available polymerization grade meet the agreement of 3GPP.
Figure BDA00002467405600115
Figure BDA00002467405600121
In an example, suppose that the EPDCCH obtaining is configured to KD=1, KL=0, ND in step S210 1=4, the subframe structure obtaining for other situation and each PRB be 2 to the amount R of comprised ECCE, in step S220, determine being distributed as of EPDCCH candidate according to table 1: concentrate at a distributed EPDCCH, polymerization grade is that 1,2,4,8,16 EPDCCH candidate's quantity is respectively 8,4,2,1,0.
The EPDCCH candidate's of each polymerization grade quantity 8,4,2,1,0 is 0 or 2 non-negative positive integer time power.Therefore, meet above-mentioned (1).
EPDCCH candidate's total quantity is 15 (=8+4+2+1+0), and it is less than first threshold M thresh=16.The maximum of the EPDCCH candidate's of all polymerization grades that EPDCCH collection can carry quantity is 15,
Figure BDA00002467405600123
Therefore, meet above-mentioned (2), EPDCCH candidate's total quantity is more than or equal to min (A, M thresh-1).
The EPDCCH candidate's of each polymerization grade that this distributed EPDCCH collection can carry maximum quantity is respectively 8,4,2,1,0, and the EPDCCH candidate's of each polymerization grade quantity is respectively 8,4,2,1,0.Therefore, meet above-mentioned (5), the EPDCCH candidate's of a polymerization grade quantity is less than or equal to the EPDCCH candidate's of this polymerization grade that can carry maximum quantity.In addition, also meeting above-mentioned (6), is at least one EPDCCH candidate of each polymerization distribution of grades, unless the number of resources of this EPDCCH collection is not enough to carry the EPDCCH candidate of this polymerization grade.In addition, also meet above-mentioned (7).
In another example, suppose that the EPDCCH obtaining is configured to KD=1, KL=0, ND in step S210 1=8, the subframe structure obtaining for other situation and each PRB be 4 to the amount R of comprised ECCE, in step S220, determine being distributed as of EPDCCH candidate according to table 1: concentrate at a distributed EPDCCH, polymerization grade is that 1,2,4,8,16 EPDCCH candidate's quantity is respectively 4,4,4,2,2.
Because the EPDCCH candidate's of the highest polymerization grade quantity is 2, therefore determined EPDCCH candidate's distribution meets above-mentioned (7).Be similar to above-mentioned example, in this embodiment, that determined EPDCCH candidate's distribution also meets is above-mentioned (1), (2), (5), (6), does not repeat them here.
In another example, suppose that the EPDCCH obtaining is configured to KD=2, KL=0, ND in step S210 1=8, ND 2=4, the subframe structure obtaining for other situation and each PRB be 2 to the amount R of comprised ECCE, in step S220, determine being distributed as of EPDCCH candidate according to table 1: concentrate comprising 8 the first right distributed EPDCCH of PRB, polymerization grade is that 1,2,4,8,16 EPDCCH candidate's quantity is respectively 4,4,1,1,1; Concentrate comprising the second distributed EPDCCH that 8 PRB are right, polymerization grade is that 1,2,4,8,16 EPDCCH candidate's quantity is respectively 1,2,1,1,0.
The right quantity of PRB that the first distributed EPDCCH collection comprises be 8 and EPDCCH candidate add up to 11 (=4+4+1+1+1), the right quantity of PRB that the second distributed EPDCCH collection comprises be 4 and EPDCCH candidate add up to 5 (=1+2+1+1+0).Therefore,, under the prerequisite of identical transmission means, comprise the concentrated EPDCCH candidate of EPDCCH that more PRB is right also more, thereby meet above-mentioned (3).And these two distributed EPDCCH concentrate EPDCCH candidate's the ratio 11: 5 of quantity and the ratio of number of resources 8: 4 very close.Be similar to above-mentioned example, in this embodiment, that determined EPDCCH candidate's distribution also meets is above-mentioned (1), (2), (5), (6), does not repeat them here.In addition, concentrate at the second distributed EPDCCH, the EPDCCH candidate's that polymerization grade is 2 quantity is larger than the quantity of other polymerization grades, and this considers that in general polymerization grade 2 is the most frequently used in link circuit self-adapting.
In another example, suppose that the EPDCCH obtaining is configured to KD=1, KL=1, ND in step S210 1=4, ND 2=4, the subframe structure obtaining for other situation and each PRB be 2 to the amount R of comprised ECCE, in step S220, determine being distributed as of EPDCCH candidate according to table 1: concentrate at distributed EPDCCH, polymerization grade is that 1,2,4,8,16 EPDCCH candidate's quantity is respectively 0,0,2,2,1; Concentrate at centralized EPDCCH, polymerization grade is that 1,2,4,8,16 EPDCCH candidate's quantity is respectively 4,4,2,1,0.
The concentrated EPDCCH candidate's of distributed EPDCCH total quantity is 5, and the concentrated EPDCCH candidate's of centralized EPDCCH total quantity is 11.Therefore, meet above-mentioned (4), the EPDCCH candidate's of all available polymerization grade that centralized EPDCCH concentrates quantity is greater than the EPDCCH candidate's of all available polymerization grade of distributed EPDCCH collection quantity.Be similar to above-mentioned example, in this embodiment, determined EPDCCH candidate's distribution also meets above-mentioned (2), (5), (6), do not repeat them here.
Those skilled in the art will be understood that above-described embodiment is all exemplary and nonrestrictive.The different technologies feature occurring in different embodiment can combine, to obtain beneficial effect.Those skilled in the art, on the basis of research accompanying drawing, specification and claims, will be understood that and realize the embodiment of other variations of disclosed embodiment.In claims, term " comprises " does not get rid of other devices or step; Indefinite article " one " is not got rid of multiple; Term " first ", " second " are for indicating title but not for representing any specific order.Any Reference numeral in claim all should not be understood to the restriction to protection range.Some technical characterictic appears in different dependent claims and does not mean that and these technical characterictics can not be combined to obtain beneficial effect.

Claims (13)

1. for determining the EPDCCH candidate's concentrated at one or more enhancement mode Physical Downlink Control Channel EPDCCH the method for distribution, wherein, described EPDCCH collection is distributed EPDCCH collection or centralized EPDCCH collection, said method comprising the steps of:
A. obtain EPDCCH configuration and subframe structure, described EPDCCH configuration comprises KD, KL, ND i, NL j, i=1...KD, j=1...KL, wherein, KD is the quantity that described one or more EPDCCH concentrates distributed EPDCCH collection, KL is the quantity that described one or more EPDCCH concentrates centralized EPDCCH collection, ND ii the right quantity of Physical Resource Block PRB that distributed EPDCCH collection comprises, NL jj the right quantity of PRB that centralized EPDCCH collection comprises, ND i, NL jand in described subframe structure, each PRB is all 2 positive integer time power to the amount R of comprised enhancement mode control channel unit ECCE; And
B. according to described EPDCCH configuration, described subframe structure and the predetermined corresponding relation between described EPDCCH configuration and described subframe structure and EPDCCH candidate's distribution, determine described EPDCCH candidate's distribution
Figure FDA00002467405500011
with
Figure FDA00002467405500012
q=1...Q, Q is the quantity corresponding to the available polymerization grade of described subframe structure,
Figure FDA00002467405500013
that i the concentrated polymerization grade of distributed EPDCCH is AL qePDCCH candidate's quantity,
Figure FDA00002467405500014
that j the concentrated polymerization grade of centralized EPDCCH is AL qePDCCH candidate's quantity, AL qq polymerization grade in described available polymerization grade, AL qbe 2 nonnegative integer time power and increase progressively i.e. AL 1< ... < AL q;
Wherein,
Figure FDA00002467405500015
with
Figure FDA00002467405500016
be 0 or 2 non-negative positive integer time power.
2. method according to claim 1, is characterized in that,
Described EPDCCH candidate's total quantity
Figure FDA00002467405500017
be less than or equal to first threshold M thresh, described first threshold M threshbe 2 positive integer time power; And
Described EPDCCH candidate's total quantity is more than or equal to min (A, M thresh-1), wherein A is the maximum of the EPDCCH candidate's of all polymerization grades that can carry of described one or more EPDCCH collection quantity,
Figure FDA00002467405500021
3. method according to claim 1, it is characterized in that, any two EPDCCH collection that any two EPDCCH collection of concentrating for described distributed EPDCCH or described centralized EPDCCH concentrate, if the right quantity of PRB that the EPDCCH collection that described two EPDCCH concentrate comprises is not less than the right quantity of PRB that another concentrated EPDCCH collection of described two EPDCCH comprises, the EPDCCH candidate's of all polymerization grades that a described EPDCCH concentrates quantity is not less than the EPDCCH candidate's of the concentrated all polymerization grades of described another EPDCCH quantity, for i1, i2 ∈ { 1...KD}, i1 ≠ i2, KD>=2, if ND i1>=ND i2, &Sigma; q = 1 Q MD i 1 q &GreaterEqual; &Sigma; q = 1 Q MD i 2 q ,
And
For j1, { KL>=2, if NL for 1...KL}, j1 ≠ j2 for j2 ∈ j1>=NL j2, &Sigma; q = 1 Q ML j 1 q &GreaterEqual; &Sigma; q = 1 Q ML j 2 q .
4. method according to claim 1, it is characterized in that, the EPDCCH candidate's of all described available polymerization grade that all described centralized EPDCCH concentrate quantity is greater than all described available polymerization grade EPDCCH candidate's of all described distributed EPDCCH collection quantity,
&Sigma; j = 1 NL &Sigma; q = 1 Q ML j q > &Sigma; i = 1 ND &Sigma; q = 1 Q MD i q .
5. method according to claim 1, is characterized in that, it is AL that i distributed EPDCCH concentrates polymerization grade qePDCCH candidate's quantity
Figure FDA00002467405500025
be less than or equal to this distributed EPDCCH and integrate the polymerization grade that can carry as AL qePDCCH candidate's maximum quantity, and j centralized EPDCCH to concentrate polymerization grade be AL qePDCCH candidate's quantity
Figure FDA00002467405500026
be less than or equal to this centralized EPDCCH and integrate the polymerization grade that can carry as AL qePDCCH candidate's maximum quantity,
Figure FDA00002467405500031
And
Figure FDA00002467405500032
6. method according to claim 5, is characterized in that,
Figure FDA00002467405500033
And
Figure FDA00002467405500034
7. method according to claim 5, is characterized in that,
Figure FDA00002467405500035
And
Figure FDA00002467405500036
8. method according to claim 1, it is characterized in that, for two different EPDCCH configuration and subframe structures, if the concentrated right quantity of PRB of described distributed EPDCCH is identical under described two different EPDCCH configurations, and the quantity that the concentrated PRB of described centralized EPDCCH is right is also identical under described two different EPDCCH configurations, two EPDCCH candidates' that determine according to described two different EPDCCH configurations and described subframe structure so respectively distribution is not identical.
9. method according to claim 1, is characterized in that, the total quantity of described one or more EPDCCH collection is less than or equal to 2, i.e. KD+KL≤2.
10. method according to claim 1, is characterized in that, the right quantity of PRB that each EPDCCH collection that described one or more EPDCCH concentrate comprises is 2,4 or 8, i.e. ND i∈ { 2,4,8}, i=1...KD, and NL j∈ { 2,4,8}, j=1...KL.
11. 1 kinds for determining the EPDCCH candidate's concentrated at one or more enhancement mode Physical Downlink Control Channel EPDCCH the device of distribution, and wherein, described EPDCCH collection is distributed EPDCCH collection or centralized EPDCCH collection, and described device comprises:
Acquiring unit, it is for obtaining EPDCCH configuration and subframe structure, and described EPDCCH configuration comprises KD, KL, ND i, NL j, i=1...KD, j=1...KL, wherein, KD is the quantity that described one or more EPDCCH concentrates distributed EPDCCH collection, KL is the quantity that described one or more EPDCCH concentrates centralized EPDCCH collection, ND ii the right quantity of Physical Resource Block PRB that distributed EPDCCH collection comprises, NL jj the right quantity of PRB that centralized EPDCCH collection comprises, ND i, NL jand in described subframe structure, each PRB is 2 positive integer time power to the amount R of comprised enhancement mode control channel unit ECCE; And
Determining unit, it,, for according to described EPDCCH configuration, described subframe structure and the predetermined corresponding relation between described EPDCCH configuration and described subframe structure and EPDCCH candidate's distribution, determines described EPDCCH candidate's distribution
Figure FDA00002467405500041
with
Figure FDA00002467405500042
q=1...Q, Q is the quantity corresponding to the available polymerization grade of described subframe structure,
Figure FDA00002467405500043
that i the concentrated polymerization grade of distributed EPDCCH is AL qePDCCH candidate's quantity, that j the concentrated polymerization grade of centralized EPDCCH is AL qePDCCH candidate's quantity, AL qq polymerization grade in described available polymerization grade, AL qbe 2 nonnegative integer time power and increase progressively i.e. AL 1< ... < AL q;
Wherein,
Figure FDA00002467405500045
with
Figure FDA00002467405500046
be 0 or 2 non-negative positive integer time power.
12. 1 kinds of base stations, it comprises device according to claim 11.
13. 1 kinds of subscriber equipmenies, it comprises device according to claim 11.
CN201210489394.2A 2012-11-05 2012-11-26 Method and device for determining distribution of EPDCCH (Enhanced Physical Downlink Control Channel) candidates Pending CN103813389A (en)

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