CN101242625A - A method, system and device for control channel resource mapping - Google Patents

A method, system and device for control channel resource mapping Download PDF

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CN101242625A
CN101242625A CNA2007101015860A CN200710101586A CN101242625A CN 101242625 A CN101242625 A CN 101242625A CN A2007101015860 A CNA2007101015860 A CN A2007101015860A CN 200710101586 A CN200710101586 A CN 200710101586A CN 101242625 A CN101242625 A CN 101242625A
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control unit
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resource
crb
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CN101242625B (en
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李洋
马蒂斯·温斯特姆
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Huawei Technologies Co Ltd
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Abstract

The invention discloses a channel resource mapping controlling method, including: dividing available bandwidth of controlling channels within N available orthogonal frequency division multiplexing (OFDM) symbols into M controlling sub-bands; mapping control resource block (CRB) with determined capacity of C resource elements (RE) onto C RE in M controlling sub-bands; allocating a integral number of CRB for control signaling bearing control channel, mapping mentioned control channel onto mapping resource of allocated CRB, wherein M, N, C are integers bigger than 0. Moreover, the invention also discloses a system and device for controlling mapping of channel resources, which could reduce complexity of coding.

Description

A kind of method, system and device of control channel resource mapping
Technical field
The present invention relates to the resource mapping techniques in the communication system, relate in particular to a kind of method, system and device of control channel resource mapping.
Background technology
At present, insert in (E-UTRA) system, adopt OFDM (OFDM) technology in the downlink transfer as multi-access mode at third generation cooperative programme (3GPP) evolution global radio.OFDM is a kind of multi-carrier communication technology.In multi-carrier communications systems, by distributing different running time-frequency resources to realize multiuser multiplexing for different user.
Referring to Fig. 1, Fig. 1 is the running time-frequency resource structural representation under the OFDM mode.As shown in Figure 1, the running time-frequency resource under the OFDM mode is represented by the two dimensional surface of being made up of time and frequency.Among Fig. 1, on time orientation, be unit with the OFDM symbol; On frequency direction, be unit with the subcarrier.Wherein the unit sub-carrier resources on the unit symbol is minimum Resource Unit (RE).
The base station is before the dispatched users service data transmission, need to send corresponding control information by control channel earlier, as: the sign of dispatched users, the transfer of data physical source distributing, data block size, modulation coding mode (MCS), many antenna transmission mode, and mix automatic repeat requests (HARQ) process indication etc.Wherein, down control channel can be encoded separately, i.e. the control information of each dispatched users is encoded separately, generates independently to control signaling packet separately.The base station can be according to user's channel condition, and self adaptation is determined the transmitting power and the MCS of its control signaling, to obtain better sub-district covering performance.
Under the OFDM mode, the downlink bandwidth resource allocation is unit with the frame, in a frame, the data channel time division multiplexing of control channel and service data transmission, control channel are positioned at N symbol of subframe original position, wherein, N is the symbol numbers that can be used for control channel, as N≤3 in some system.Like this, the user can at first obtain scheduling related control information, if be not scheduled for, then enter microsleep dormancy state and needn't receive and handle the signal of whole subframe transmission.Suppose that Fig. 1 is the resource allocation of a subframe, then in some system, control channel can be arranged in the the 1st, the 2nd and the 3rd symbol of Fig. 1.
Because the E-UTRA system adopts dynamic dispatching, resource-sharing, different dispatched users and dispatched users quantity constantly all can change, and cause the running time-frequency resource and the transmitting power of control channel transmission needs also can change thereupon.If the demand according to maximum is reserved, then the wasting of resources is more serious, influences power system capacity, therefore, needs with the running time-frequency resource that takies according to the dynamic or semi-static adjustment control channel of scheduling situation.For example, adjust OFDM symbol numbers N or subcarrier number, and indicate adjustment information, as the value of N etc. by extra control information.
In order to obtain frequency diversity gain, interference randomization and power-balance, each user's control signaling need be dispersed on the whole available running time-frequency resource, promptly on the individual available OFDM symbol of The whole control channel available bandwidth (length on the frequency direction) and N.In addition, because the control channel of each cell transmission all concentrates in limited several OFDM symbols, presence of intercell interference can influence the demodulation performance of control channel, therefore need make the interference randomization of sub-district.
For this reason, have a kind of running time-frequency resource mapping scheme of control channel to be in the prior art: the resource that each user's control signaling takies is made up of the identical control channel element (CE) of one or more sizes; Each CE is made up of the RE that is dispersed in whole bandwidth and N OFDM symbol, and the RE quantity that wherein is dispersed on first OFDM symbol is less than the RE quantity that is dispersed on other OFDM symbol; When N changed, the quantity of CE remained unchanged, but since control channel can with total resources change, the RE quantity that comprises of CE then, promptly the size of CE also will change.
But in the such scheme since original control information be changeless, therefore when original control information is encoded according to the appointment code check, for the continuous situation about changing of CE size in the prior art, the control signalling coding need adopt more rate-matched mode, as bit repetition or punching etc., therefore increase the complexity of coding, also brought the wasting of resources to a certain degree simultaneously.In addition, do not provide the implementation of control channel interference randomization in this scheme yet.
Summary of the invention
In view of this, a kind of method of control channel resource mapping is provided in the embodiment of the invention on the one hand; Provide a kind of system and device of control channel resource mapping on the other hand, so that reduce encoder complexity.
The method of the control channel resource mapping that is provided in the embodiment of the invention comprises:
Control channel available bandwidth in the control channel available orthogonal frequency division multiplexing multiple access OFDM symbol is divided into M control subband;
Be defined as shining upon size on C the Resource Unit of control resource block mapping in described M control subband of C Resource Unit;
Control channel distribution integer control Resource Block for bearer control signalling is mapped in described control channel on the resource of the control resource block mapping of being distributed, and wherein, M, N, C are respectively the integer greater than 0.
The system of the control channel resource mapping that is provided in the embodiment of the invention comprises:
The CRB mapping device, be used for control channel can be divided into M control subband with the control channel available bandwidth in the OFDM symbol, size is defined as shining upon on C the Resource Unit of control resource block mapping in described M control subband of C Resource Unit, and will controls resource block mapping information and offer and control the signaling bear device;
Control signaling bear device, the control resource block mapping information that provides according to the CRB mapping device is provided, control channel distribution integer control Resource Block for bearer control signalling, described control channel is mapped on the resource of the control resource block mapping of being distributed, wherein, M, N, C are respectively the integer greater than 0.
The device of the control channel resource mapping that is provided in the embodiment of the invention comprises:
CRB dividing elements module, be used for according to the RE quantitative proportion that can be used for the control channel transmission in each available OFDM symbol, determine the size of the control Resource Block unit that the control Resource Block can be divided, according to determined control Resource Block cell size, to control Resource Block and be divided into M control Resource Block unit, and M value and control Resource Block cell size information will be offered the CRB mapping block;
The CRB mapping block, the M value that provides according to CRB dividing elements module is provided and controls Resource Block cell size information, control channel available bandwidth in the available OFDM symbol is divided into M control subband, and M the control Resource Block unit maps of desire being shone upon the control Resource Block of C Resource Unit controlled in the subband at described M.
The device of the control channel resource mapping that provides again in the embodiment of the invention,
Control unit size determination module, be used for according to the Resource Unit quantitative proportion that can be used for the control channel transmission in N the available OFDM symbol, when determining that the Resource Unit in each OFDM symbol is divided into P control unit, the size of the control unit in each OFDM symbol, and the control unit size information of being divided offered the CRB mapping block;
The CRB mapping block, be used for dividing the control unit size information that module provides according to control unit, control channel available bandwidth in the available OFDM symbol is divided into M control subband, all be divided into P control unit in each each OFDM symbol of control subband, the control resource block mapping of desire being shone upon C Resource Unit is in the control unit of control subband.
The device of the control channel resource mapping that provides again in the embodiment of the invention comprises:
Control unit is divided module, be used for the control channel available bandwidth in the available OFDM symbol is divided into M control subband, Resource Unit in each OFDM symbol in each control subband is divided into P equal-sized control unit, and institute's divided information is offered the CRB mapping block;
The CRB mapping block is used for dividing the division information that module provides according to control unit, according to the principle that the control Resource Block shines upon in an integer control unit, the control resource block mapping is divided in the control unit of being divided in the module at control unit.
From such scheme as can be seen, the control Resource Block of keep determining in the embodiment of the invention (CRB) big or small constant, thus reduced complexity when encoding.When shining upon, earlier the control channel available bandwidth is divided into M control subband, the CRB of C RE of the desire of bearer control signalling mapping is mapped in the OFDM symbol available in M the control subband, thereby feasible control signaling of carrying can be dispersed in The whole control channel available bandwidth and the available OFDM symbol.Improve frequency diversity gain, strengthened antijamming capability.
Description of drawings
Fig. 1 is the running time-frequency resource structural representation under the OFDM mode.
Fig. 2 is the exemplary process diagram of control channel method for mapping resource in the embodiment of the invention.
Fig. 3 divides control subband and control unit running time-frequency resource structural representation afterwards in the method shown in Figure 2.
Fig. 4 is the exemplary block diagram of control channel resource mapped system in the embodiment of the invention.
Fig. 5 is the flow chart of control channel method for mapping resource in the specific embodiment of the invention one.
The running time-frequency resource mapping structure schematic diagram of Fig. 6 when shining upon according to control unit sequenced collection S in the flow process shown in Figure 5.
Fig. 7 is the structural representation of control channel resource mapping apparatus in the specific embodiment of the invention one.
Fig. 8 is the flow chart of control channel method for mapping resource in the specific embodiment of the invention two.
The running time-frequency resource mapping structure schematic diagram of Fig. 9 when shining upon according to control unit sequenced collection G in the flow process shown in Figure 8.
Figure 10 is the structural representation of control channel resource mapping apparatus in the specific embodiment of the invention two.
Figure 11 is the flow chart of control channel method for mapping resource in the specific embodiment of the invention two.
The running time-frequency resource mapping structure schematic diagram of Figure 12 when shining upon according to control unit sequenced collection H in the flow process shown in Figure 11.
Figure 13 is the structural representation of control channel resource mapping apparatus in the specific embodiment of the invention two.
Figure 14 is the structural representation of another running time-frequency resource mapping among the embodiment two.
Figure 15 is the structural representation of another running time-frequency resource mapping among the embodiment three.
Embodiment
In the embodiment of the present invention, the control channel resource of bearer control signalling is made up of an integer control channel resource allocation unit, easy in order to describe, this control channel resource allocation unit is defined as control Resource Block (CRB, CoCtrol Resource Block).
In order to carry out the control channel resource allocation, in the embodiment of the present invention, according to the control channel resource requirement of the control signaling of carrying various forms,, determine the RE number C of CRB desire mapping in advance according to the principle of each control channel resource occupation integer CRB.Afterwards, control channel can be divided into M control subband with the control channel available bandwidth in the OFDM symbol, the CRB that size is defined as shining upon C RE is mapped in M control subband on C the RE, control channel distribution integer CRB for bearer control signalling, described control channel is mapped on the resource of the CRB mapping that is distributed, wherein, M, N, C are respectively the integer greater than 0.
Referring to Fig. 2, Fig. 2 is the exemplary process diagram of control channel method for mapping resource in the embodiment of the invention.As shown in Figure 2, this flow process comprises the steps:
Step 201 according to the control signal resource demand of various forms, according to the principle of each control channel resource occupation integer CRB, is determined the RE number C of CRB desire mapping.
Because the control signaling of transmission has multiple form in the control channel, as different MCS and the relevant signaling of different up/descending scheduling etc., and the required control channel stock number that takies of the control signaling of different-format is also different, therefore need need take the resource requirement of control channel according to the control signaling of various forms, determine the size of a unified CRB.For this reason, can determine the size of a unified CRB according to the principle of each control channel resource occupation integer CRB.
For example: if the control signaling of 3 kinds of encoder bit rates is arranged in control channel, code check is respectively 2/3,1/3 and 1/6, wherein if the stock number that the control signaling of the highest code check 2/3 needs is 40 RE, then code check is that the stock number that 1/3 and 1/6 control signaling need take is 80 and 160 RE.RE resource according to the control signaling needs of these forms, the RE number C that can determine single CRB desire mapping is 40, the size of promptly determining CRB is 40 RE, and the control channel resource of then carrying 2/3,1/3,1/6 Rate Control signaling is respectively by 1 CRB, and 2 CRB and 3 CRB form.
Certainly above-mentionedly just illustrate, in the practical application, need to determine as the case may be the RE number C of single CRB desire mapping.
For the CRB size of dividing, the resource representation that the control signaling need be able to be taken is an integer CRB, and each CRB correspondence is hinted obliquely at one group of RE, and the pairing RE group of different CRB is mutually disjointed.
Step 202 can be divided into M control subband with the control channel available bandwidth in the OFDM symbol with control channel.
In this step, disperse to be carried in control channel available bandwidth and the available OFDM symbol in order to control signaling, control channel can be divided (preferably with the control channel available bandwidth in the OFDM symbol, evenly divide) be M control subband, then CRB is mapped on M C the RE in the control subband.In addition, M the control subband of dividing on frequency direction, can be numbered according to frequency order.For example: from the high frequency to the low frequency or from the low frequency to the high frequency, number consecutively is the 0th, the 1, to M-1 control subband.
Wherein, the value of M can pre-determine, and can adopt following three kinds of methods at least:
Method one: can determine the size of the CRB unit that CRB can divide according to the ratio of the RE quantity that can be used for the control channel transmission in each available OFDM symbol, i.e. the RE quantity U of CRB unit desire mapping.Suppose that available OFDM symbol is N, the RE quantity that N OFDM symbol can be used for control channel is respectively O 1, O 2..., O N, determine that then the RE quantity of CRB unit on each OFDM symbol that CRB can divide satisfies v 1: v 2: ...: v N=O 1: O 2: ...: O N, determine the RE quantity v of CRB unit on each OFDM symbol afterwards 1, v 2..., v NValue, further determine the big or small U=v of CRB unit 1+ v 2+ ...+v N, according to the RE quantity C of CRB desire mapping, the control subband number M of calculating definite control channel available bandwidth division is the smallest positive integral more than or equal to C/U, promptly
Figure A20071010158600132
Method two: at first, when determining that the RE in each available OFDM symbol divided equal-sized control unit, the size of each available OFDM symbol inner control unit.Wherein, when dividing control unit, the whole RE in the control channel available bandwidth can be divided, also can only the RE that is used for the control channel transmission in the control channel available bandwidth be divided.Suppose that available OFDM symbol is N, if the whole RE in the control channel available bandwidth are divided, the equal and opposite in direction of N OFDM symbol inner control unit then is as if being expressed as u respectively 1, u 2..., u N, u then 1: u 2: ...: u N=1: 1: ...: 1.If only the RE that is used for the control channel transmission in the control channel available bandwidth is divided, then can determine the magnitude proportion of N OFDM symbol inner control unit according to the RE quantitative proportion that can be used for the control channel transmission in each available OFDM symbol.Suppose that the RE quantity that can be used for control channel in n the OFDM symbol is respectively O 1, O 2..., O N, if the size of N OFDM symbol inner control unit is used u respectively 1, u 2... u NRelational expression u is then satisfied in expression 1: u 2: ...: u N=O 1: O 2: ...: O NAccording to the u that determines 1, u 2..., u NConcern ratio, determine u 1, u 2..., u NSize.Afterwards, can be according to relational expression C M × N = ( u 1 + u 2 + . . . . . . + u N ) × R Calculate.Be M be more than or equal to C × N ( u 1 + u 2 + . . . . . . + u N ) × R Smallest positive integral
Figure A20071010158600141
Wherein, R is a positive integer, for specific n and u 1, u 2..., u nGet minimum possibility value, during R=1, M gets maximum, and when R=N, formula (2) is similar with formula (1).
Because it is variable being used for the OFDM symbol quantity N that control channel takies, then according to formula (2), the value of M can respective change.In order to reduce system complexity, also can set unified control subband number, make C M * N _ max = ( u 1 + u 2 + u 3 + . . . . . . u N _ max ) * R - - - ( 3 )
Wherein, N_max is maximum available OFDM symbol quantity.At this moment, when N changed, the control unit quantity that CRB shines upon in each control subband can respective change.
Method three: also can rule of thumb accumulate and actual demand such as diversity gain, directly determine the value of M.As the value that can directly determine M is 4,8,10,20 etc.
In above-mentioned three methods, M the control subband of dividing not necessarily all is used to control the signaling transmission, control channel can also can change with the quantity of control subband, and transmitting terminal can be indicated control subband number and the position that control channel can be used in the current subframe to the user by the control signaling.For example, N control channel can be divided into 10 control subbands with the control channel available bandwidth in the OFDM symbol, according to the resource requirement of current control channel transmission, only needs the RE of 5 control subbands to get final product.And available control subband should be dispersed on the whole frequency band as far as possible, to obtain frequency diversity gain, for example, in 10 control subbands that the control channel available bandwidth is divided control channel can with 5 control subbands be the 0th, 2,4,6,8 control subbands.
Step 203, the CRB that determined desire is shone upon C RE is mapped in M the control subband.
In this step, when being mapped in CRB in M the control subband, can be even mapping, also can be non-homogeneous mapping; Can shine upon at interval and (comprise: evenly mapping and non-uniform spacing mapping at interval), also can concentrate mapping.Wherein, CRB only takies the RE that is used for the control channel transmission in the control subband.
The OFDM symbol of supposing to can be used for control channel is N, then during specific implementation, CRB can be divided (preferably, evenly dividing) and be M CRB unit, and can determine the RE quantity u of CRB unit on N OFDM symbol according to the method for describing in the step 202 one 1, u 2..., u NValue, with each control RE in subband according to u 1, u 2..., u NValue evenly be divided into P control unit, then each CRB unit is mapped in the control unit of control subband according to default mapping ruler.
Perhaps, the RE that each can be controlled in each the available OFDM symbol in the subband is divided into P equal-sized control unit, wherein, the whole RE in the control subband can be divided, and also can only will control the RE that is used for the control channel transmission in the subband and divide.
If whole RE that will control in the subband divide, the equal and opposite in direction of N OFDM symbol inner control unit then is as if being expressed as u respectively 1, u 2..., N, then u 1: u 2: ...: u N=1: 1: ...: 1.Then can arbitrarily determine the value of P and the size of control unit as required.
Dividing if only will control the RE that is used for the control channel transmission in the subband, can be O according to the RE quantitative proportion that can be used for the control channel transmission in each available OFDM symbol then 1: O 2: ...: O N, determine the magnitude proportion u of N OFDM symbol inner control unit 1: u 2: ...: u N=O 1: O 2: ...: O NCan calculate u according to formula (2) or formula (3) then 1+ u 2+ ...+u NValue, afterwards according to u 1, u 2..., u NRatio and the value of summation, determine u 1, u 2..., u NValue.And can be according to the big or small u of the control unit in determined each OFDM symbol 1, u 2... u NAnd control the RE quantity that is comprised in each OFDM symbol of subband, determine the value of P.Afterwards, the principle according to CRB shines upon in an integer control unit is mapped in according to default mapping ruler in the control unit of control subband.
Perhaps, RE in each available OFDM symbol in each control subband is divided into P equal-sized control unit, can determine the value of P earlier, directly according to the RE quantity that is comprised in each OFDM symbol in the control subband, determine the big or small u of the control unit in each OFDM symbol afterwards 1, u 2..., u N, afterwards, the principle according to CRB shines upon in an integer control unit is mapped in according to default mapping ruler in the control unit of control subband.
With N=3, M=4, P=7 are example, and then the running time-frequency resource structural representation behind division control subband and the control unit among Fig. 3, comprises several RE as shown in Figure 3 in each control unit, and in first OFDM symbol, control unit comprises u 1Individual RE, in second OFDM symbol, control unit comprises u 2Individual RE, in the 3rd the OFDM symbol, control unit comprises u 3Individual RE.
If P control unit being divided on frequency direction, is numbered according to frequency order (from the low frequency to the high frequency, or from the high frequency to the low frequency), and remembers that this is numbered physics and numbers.The control unit that physics on n OFDM symbol in m the control subband is numbered p be expressed as C (m, n, p), 0≤m≤M-1,0≤n≤N-1,0≤p≤P-1.Control unit sequenced collection arbitrarily then can be set, and each control unit sequenced collection can be represented a kind of default mapping ruler.For example: the control unit sequenced collection can for: A={C (0,0, f 0), C (1,1, f 1) ..., C (M-1, and mod (m, N), mod (f M-1, P)), and C (1,0, f 0+ 1), and C (1,1, f 1+ 1) ..., C (M-1, and mod (m, N), mod (f M-1+ 1, P)), C (M-1,0, f 0+ P-1), C (M-1,1, f 1+ P-1) ..., C (M-1, and mod (m, N), mod (f M-1+ P-1, P)).Wherein, f i(0≤f i≤ M-1) be the frequency offset amount of i control subband correspondence, different side-play amounts also can be adopted in each sub-district.This control unit sequenced collection is represented: choose control unit on the interior OFDM symbol of each control subband earlier, after each control subband is chosen a control unit, return the 0th same each control subband of control subband again and choose a control unit, the rest may be inferred, up to control channel can all have been chosen with control unit.Perhaps also can for: B={C (0,0, l 0, f 0), C (0,1, l 1, f 0) ..., C (0, N-1, l N-1, f 0), C (1,0, l 0, f 1), C (1,1, l 1, f 1) ..., C (1, N-1, l N-1, f 1) ..., C (M-1,0, l 0, f M-1), C (M-1,1, l 1, f M-1) ..., C (M-1, N-1, l N-1, f M-1), C (0,0, mod (l 0+ 1, P), f 0) ..., C (M-1, N-1, mod (l 0+ P-1, P), f M-1) ..., C (0,0, mod (l 0+ 1, P), f 0) ..., C (M-1, N-1, mod (l N-1+ P-1, P), f M-1) etc.Wherein, l i(0≤l i≤ P-1) be frequency offset corresponding in i the OFDM symbol, different side-play amounts, f can be adopted in each sub-district i(0≤f i≤ P-1) be the frequency offset amount of i control subband correspondence, different side-play amounts also can be adopted in each sub-district.This control unit sequenced collection is represented: choose a control unit on each OFDM symbol earlier in a control subband, after all choosing 1 control unit on each each OFDM symbol of control subband, return each OFDM symbol of the 0th same each the control subband of control subband again and choose a control unit, the rest may be inferred, up to control channel can all have been chosen with control unit.
In addition, also can unify numbering to the control unit of dividing on all OFDM symbols in the control subband, for example according to the time-frequency two-dimensional order (to high frequency, be routed to second OFDM symbol again from the low frequency of first OFDM symbol from the low frequency to the high frequency, and the like; Or from an OFDM symbol of low frequency to N OFDM symbol, be routed to high frequency again from first to N OFDM symbol.) be numbered, and remember that this is numbered the physics numbering.Then the control unit that physics in m the control subband is numbered p be expressed as C (m, p), 0≤m≤M-1,0≤p≤N*P-1.Control unit sequenced collection arbitrarily can be set equally, and each control unit sequenced collection can be represented a kind of default mapping ruler.For example: the control unit sequenced collection can for: C={C (0, i 0) ..., C (M-1, mod (i M-1, N*P)), and C (0, mod (i 0+ 1, N*P)) ..., C (M-1, mod (i M-1+ 1, N*P)) ..., C (0, mod (i 0+ N*P-1, N*P) ..., C (M-1, mod (i M-1+ N*P-1, N*P)).Wherein, i k(0≤i k≤ N*P-1) be i to control subband corresponding control unit sequence number amount of bias that different amount of bias also can be adopted in each sub-district.This control unit sequenced collection is represented: choose control unit on the interior OFDM symbol of each control subband earlier, after each control subband is chosen a control unit, return the 0th same each control subband of control subband again and choose a control unit, the rest may be inferred, up to control channel can all have been chosen with control unit.
In order to realize the interference randomization of each sub-district, but each sub-district of cell allocation particular random sequence.This particular random sequence can be the frequency offset sequence F={f of control subband correspondence 0, f 1..., f M-1, this frequency offset sequence is the corresponding offset sequence of control subband, f i(0≤f i≤ P-1) be the frequency offset amount of i control subband correspondence.The offset sequence difference of each cell allocation can be corresponding one by one with cell ID (Cell-ID).In addition, frequency offset sequence L={l corresponding in the OFDM symbol also can be distributed in each sub-district 0, l 1..., l N-1, l i(0≤l i≤ P-1) be frequency offset corresponding in i the OFDM symbol.Sub-district particular random sequence also can be the sequence number offset sequence I={i of all control units of division in the control subband 0, i 1..., i M-1, i k(0≤i k≤ N*P-1) be k to control the control unit sequence number amount of bias of dividing in the subband.Wherein, sub-district particular random sequence can be by Coase tower (Costas) sequence, and (RS, Reed-Solomon) sequence or other pseudo random sequence generate the Saloman, Ruide.
Further, can be according to sub-district particular random sequence, for the control unit on each OFDM symbol is set logical number.For the frequency offset sequence is an example, the logic label that physics is numbered the control unit correspondence of q is mod (f with the random sequence i+ q, P).For the control unit in each control subband carries out logical number, if the f of each control subband correspondence iDifference, the physics numbering of the control unit of then different control subband identity logic numberings is different.
Because the offset sequence difference of each cell allocation, the RE difference of the control unit correspondence of identity logic numbering in the same control subband of different districts, therefore, when same CRB mapping ruler is adopted in all sub-districts, CRB corresponding control unit time-frequency position is different, thereby has realized the interference randomization of minizone control channel.When adopting logical number, control unit sequenced collection A can be D={C (0,0,0), and C (1,1,0) ..., C (M-1, and mod (M, N), 0), C (0,0,1), C (1,1,1), ..., C (M-1, and mod (M, N), P-1) ..., C (M-1, and mod (M, N)+1, P-1) ..., C (M-1, mod (mod (M, N), N), P-1) }, the logic sequence number of last bit representation control unit in the set element wherein.
As seen, the information of each control unit in the control unit sequenced collection comprises: control sub-band information, OFDM symbolic information and offset information etc.Wherein offset information can comprise: the frequency offset information of control subband correspondence; And/or offset information also comprises: the frequency offset information of correspondence in the OFDM symbol.Wherein, the frequency offset information of control subband correspondence generally includes: the frequency offset sequence F={f that each sub-district is specific 1, f 2..., f MIn f i, wherein, f i(0≤f i≤ P-1) be the frequency offset amount of i control subband correspondence, in addition, corresponding frequency offset information also can be frequency offset sequence L=(l in the specific symbol in: each sub-district in the OFDM symbol 0, l 1..., l N-1) in l iDeng.Perhaps, the information of each control unit in the control unit sequenced collection comprises: control sub-band information and offset information etc.Wherein, offset information can be control unit sequence number offset information that each sub-district is specific, as sequence number offset sequence I={i 0, i 1..., i M-1In i k
When the control unit sequenced collection is set, when N is variable, different values that can corresponding N are set different control unit sequenced collections respectively, maximum possible value that also can corresponding N is set the control unit sequenced collection, as N during less than its maximum possible value, CRB still is mapped to the control unit in the corresponding order set in order, if run into greater than the control unit on the OFDM symbol of the current value of N, skip this unit, then shine upon next control unit.
In addition, when running time-frequency resource that needs when control channel transmission and transmitting power change, also can the retentive control channel can be constant with the number of OFDM symbol, realize that by the number that changes available control subband control channel takies the variation of resource.When the control unit sequenced collection then is set, above-mentioned control unit sequenced collection can be different control unit sequenced collections that corresponding different control subband numbers are set respectively, difference control subband number during then corresponding actual the use is mapped in CRB in the set subclass in the corresponding control unit sequenced collection.Perhaps above-mentioned control unit sequenced collection can be the maximum possible value of corresponding control subband number, the control unit sequenced collection of setting, the control subband number of using when reality is during less than its maximum possible value, CRB still is mapped to the control unit in the corresponding order set in order, if run into the control unit in the current unavailable control subband, skip this unit, then shine upon next control unit.
During concrete the mapping, according to the principle that CRB shines upon in an integer control unit, mutually disjoint subclass in the intercepting control unit sequenced collection; With CRB be mapped in intercept in the control unit in the subclass.When N is variable, if the control unit sequenced collection is the control unit sequenced collection that the maximum possible value of corresponding N is set, then as N during less than its maximum possible value, in the intercepting control unit sequenced collection during mutually disjoint subclass, if run into greater than the control unit on the OFDM symbol of the current value of N, skip this unit, then choose next control unit, selected control unit is constituted the set subclass.
When the control subband number of reality use is variable, if the control unit sequenced collection is the control unit sequenced collection that the maximum possible value of corresponding control subband number is set, then when the actual control subband number of using during less than its maximum possible value, in the intercepting control unit sequenced collection during mutually disjoint subclass, if run into the control unit on the current unavailable control subband, skip this unit, then choose next control unit, selected control unit is constituted the set subclass, CRB is mapped on the set subclass that is constituted.
For example, when control channel reality only took the control subband that part control channel available bandwidth divides, CRB only was mapped in the control subband that control channel can use.For example, the control channel available bandwidth is divided into 10 control subbands, control channel only takies 5 control subbands, then control unit can be divided according to 10 control subbands, and the control unit set A is set, during actual mapping, CRB only shines upon in the control units in spendable 5 control subbands in A, and skips in the control unit in the current control subband that can not use; Perhaps control unit is divided with 5 available control subbands, and control unit sequenced collection B is set, and then CRB is mapped among this sequenced collection B.
Wherein, CRB or CRB unit with single RE as the least resource granularity, perhaps with two adjacent R E as the least resource granularity.Wherein, two adjacent R E comprise: simultaneously-two continuous RE of frequency, perhaps with two continuous RE of frequency-time.When control channel need adopt multi-antenna emission diversity, during as Space Frequency Block Coding (SFBC) or space-time block coding (STTD), with two adjacent R E as the least resource granularity.
In addition, also can be equal to the situation that each control unit comprises a RE this moment not to control sub-band division control unit.But if can be used for the RE quantitative proportion O of control channel transmission in each available OFDM symbol 1: O 2: ...: O N≠ 1: 1...: 1, the RE quantity difference in each OFDM symbol then, the number of corresponding P is just different, this moment is in order still to be suitable for above-mentioned rule, then can divide, when CRB is shone upon, if when running into the RE that is not used in control channel transmission to all RE in each available OFDM symbol, then skip this RE, continue in next RE, to shine upon.
When the OFDM symbol numbers that can be used for control channel is variable, in order to reduce system complexity, can keep the control number of sub-bands of dividing constant, and the control unit size on each OFDM symbol is constant in the control subband.If the RE quantity that the control unit on each OFDM symbol comprises is unequal, when available OFDM symbol quantity changed, the control unit quantity that CRB comprises can change to some extent, and promptly the subclass length of Jie Qu control channel control unit sequenced collection changes to some extent.Because control unit is the least resource unit of CRB mapping, constant for the RE quantity that keeps the mapping of CRB desire, then in certain control unit of CRB mapping, only take wherein part RE.
Step 204 is a control channel distribution integer CRB of bearer control signalling, and is mapped on the resource of the CRB mapping that is distributed.
Determine good each CRB corresponding physical resource in step 203 after, the control channel resource mapping (being about to control signaling bear on physical resource RE) of different dispatched users is decided by the distribution of CRB.
Because different MCS selects, and uplink scheduling relevant information and descending scheduling relevant information is different, and can there be multiple form in the control signaling of carrying in the control channel.The user need carry out blind Detecting to the control channel of different signaling formats just can receive the control signaling that sends to oneself.
In order to reduce the complexity of subscriber equipment (UE) blind Detecting, can be the continuous CRB of each control channel distribution according to the form of control signaling, and/or, for the control channel with identical control signaling format distributes continuous CRB.As: for the control channel of control signaling with identical MCS distributes continuous CRB.Certainly, if do not consider to reduce the complexity of UE blind Detecting, also can distribute discontinuous CRB.
Afterwards, control channel is mapped in the resource of an integer CRB correspondence of being distributed.
In addition, in order to reduce the complexity of UE blind Detecting, can indicate the original position of the CRB that control channel distributed of the control signaling of various forms by default signaling.As the initial CRB position of indicating each MCS form control channel to be distributed by extra control signaling.Perhaps do not carry out signaling, and be redefined for the CRB of the low sequence number of control channel distribution of low code check MCS by default signaling indication.
For example, the base station will send 4 users' control signaling, and wherein 1 user's control signaling adopts 2/3 code check, takies 1 CRB; 2 users' control signaling adopts 1/3 code check, respectively takies 2 CRB; 1 user's control signaling adopts 1/6 code check in addition, takies 4 CRB.The control channel that then is 1/6 code check user distributes the 1st～4 CRB, is that 2 users' of 1/3 code check control channel distributes the 5th～8 CRB, is that 2/3 code check user's control channel distributes the 9th CRB.
Perhaps, if having only two kinds of control signaling formats in the control channel, the control channel that then can preestablish a kind of form distributes CRB from low to high from smallest sequence number, and the control channel of another kind of form distributes CRB from high to low from maximum sequence number.
For example, suppose to have 9 CRB to be used for the control channel mapping, control channel has two kinds of MCS form 1/3 code checks and 1/6 code check, send 4 users' control signaling, wherein 2 users' control signaling adopts 1/3 code check, respectively takies 1 CRB, two users' control signaling adopts 1/6 code check, respectively take 2 CRB, then be that the control channel of 1/3 code check distributes the 1st～2 CRB, is 1/6 code check
Further, the user can preferentially detect the control channel of its corresponding MCS form according to the channel quality of oneself.(base station decides the control signaling to this user to adopt which kind of MCS by the channel quality of user feedback, like this, the user can predict that the control signaling that the base station issues to oneself can adopt the sort of MCS according to the channel condition of oneself naturally, and preferentially detect the control channel of this MCS, detect number of times to reduce.)
In addition, because the CRB quantity that the control channel of the MCS control signaling of the low code check of carrying takies is big, the user carries out the negligible amounts of blind Detecting, therefore, under the situation of N OFDM sign resources abundance of appointment, can use the control signaling format of low code check MCS as far as possible.
At last, which the base station can have plant the control signaling format by extra control signaling indication current control channel, further reduce the number of times of user's blind Detecting.
Among the said method embodiment, can need not each execution in step 201.Then step 203 is: the control Resource Block CRB that size is defined as shining upon the composition control channel resource of C Resource Unit RE is mapped on described M C the RE in the control subband.
More than the method for control channel resource mapping in the embodiment of the invention is described in detail, again the system of control channel resource mapping in the embodiment of the invention is described in detail below.
Referring to Fig. 4, Fig. 4 is the exemplary block diagram of control channel resource mapped system in the embodiment of the invention.As shown in Figure 4, this system comprises: the CRB size is determined device, CRB mapping device and control signaling bear device.
Wherein, the CRB size is determined device, is used for the control channel resource requirement according to the control signaling of the various forms of carrying, according to the principle of a described control channel resource occupation integer CRB, determine the RE number C of CRB desire mapping, and determined C value information is offered the CRB mapping device.Wherein, definite method of the RE number C of CRB desire mapping can be consistent with the description of step 201 shown in Figure 2.
The CRB mapping device, be used for the control channel available bandwidth in control channel N the available OFDM symbol is divided into M control subband, determine the C value information that device provides according to the CRB size, CRB is mapped in M the control subband on C RE, and the CRB map information offered controls the signaling bear device.Wherein, mapping process can be consistent with the description in the step 203 shown in Figure 2.
The CRB map information that provides according to the CRB mapping device is provided control signaling bear device, is that the control channel of bearer control signalling distributes an integer CRB, and described control channel is mapped in the transmitted over resources that the CRB that distributed shines upon.
Wherein, M, C are respectively the integer greater than 0.
In the said system, can also not comprise CRB size determining unit, then system comprises: CRB mapping device and control signaling bear device.
Wherein, the CRB mapping device, be used for control channel can be divided into M control subband with the control channel available bandwidth in the OFDM symbol, the CRB that size is defined as shining upon C RE is mapped on described M C the RE that controls in the subband, and the CRB map information offered controls the signaling bear device.
Control signaling bear device, the CRB map information that provides according to the CRB mapping device is provided, and is that the control channel of bearer control signalling distributes an integer CRB, and described control channel is mapped in the transmitted over resources that the CRB that distributed shines upon, wherein, M, N, C are respectively the integer greater than 0.
Be described in detail below in conjunction with the method and system of concrete Application Example control channel resource mapping among the present invention.
Specific embodiment one:
Referring to Fig. 5, Fig. 5 is the flow chart of control channel method for mapping resource in the specific embodiment of the invention one.In the present embodiment, suppose the method described according in the step 201, pre-determined the size of CRB.As shown in Figure 5, this flow process comprises the steps:
Step 501 according to the ratio of the RE quantity that can be used for the control channel transmission in each available OFDM symbol, is determined the size of the CRB unit that CRB can divide.
In this step, can be according to the ratio of the RE quantity that can be used for the control channel transmission in each available OFDM symbol, determine the ratio of the RE quantity of CRB on each available OFDM symbol, according to the ratio of the RE quantity of determined CRB on each available OFDM symbol, determine the RE quantity U of the CRB unit desire mapping that CRB can divide.
Suppose that the RE quantity that N OFDM symbol can be used for control channel is respectively O 0, O 1..., O N-1, determine that then the RE quantity of CRB unit on each OFDM symbol that CRB can divide satisfies v 0: v 1: ...: v N-1=O 0: O 1: ...: O N-1, determine the RE quantity v of CRB unit on each OFDM symbol afterwards 0, v 1..., v N-1Value, further determine the big or small U=v of CRB unit 0+ v 1+ ...+v N-1
For example: in the E-UTRA system, the 10MHz system bandwidth has 600 control channel available subcarrier resources, owing in the 0th the OFDM symbol of each subframe descending reference symbol transmission (be used for user side and carry out channel estimating and channel quality measurement) is arranged, suppose that the reference symbol that will transmit two transmit antennas has taken 200 subcarriers altogether, then have only 400 subcarriers to can be used for control channel in the 0th the OFDM symbol, all have 600 subcarriers to can be used for control channel in other N-1 the OFDM symbol.
The size of supposing CRB is 40 RE, then:
When n=1, the CRB unit only is distributed on the 0th the OFDM symbol, gets v 0Equal that any one is available by 40 numerical value of dividing exactly, as 2,4,5 etc.
When n=2, the CRB cell distribution on two OFDM symbols, v 0: v 1=400: 600=2: 3, can get v 0=4, v 1=6, U=v then 0+ v 1=10, perhaps can get v 0=2, v 1=3, U=v then 0+ v 1=5.
When n=3, in like manner, v 0: v 1: v 2=400: 600: 600=2: 3: 3, can get v 0=2, v 1=3, v 2=3, U=8.
Step 502 according to the size of CRB unit, is determined the control subband number M that the control channel available bandwidth is divided.
According to the size of CRB unit and the size of CRB, determine the control subband number M that the control channel available bandwidth is divided.The RE quantity C of the i.e. RE quantity U that shines upon according to CRB unit desire, and CRB desire mapping according to relational expression C/U, calculates the control subband number M that the control channel available bandwidth is divided.
Be example with situation cited in the step 501 still, the size of promptly supposing CRB is 40 RE, then:
When N=1, v 1When getting 2,4,5 etc., correspondingly, the M value is 20,10,8 etc., and comprises 20,40,50 RE etc. in each control subband.
When N=2, get v 1=4, v 2=6, U=v 1+ v 2=10 o'clock, the M value was 4, in each control subband, comprised 100 RE in the 0th the OFDM symbol, comprised 150 RE in the 1st the OFDM symbol; Get v 1=2, v 2=3, U=v 1+ v 2=5 o'clock, the M value was 8, in each control subband, comprised 50 RE in first OFDM symbol, comprised 75 RE in the 2nd the OFDM symbol.
When N=3, get v 1=2, v 2=3, v 3=3, U=8, the M value is 4, in each control subband, comprises 100 RE in the 0th the OFDM symbol, comprises 150 RE in the 1st the OFDM symbol, comprises 150 RE in the 2nd the OFDM symbol.
Step 503 is divided into M control subband with the control channel available bandwidth in the available OFDM symbol.
With situation cited in step 501 and the step 502 is example, when N=1, the control channel available bandwidth is divided into 20,10,8 control subbands etc., correspondingly, comprises 20,40,50 RE etc. in each control subband.
When N=2, when the control channel available bandwidth is divided into 4 control subbands, in each control subband, comprise 100 RE in the 0th the OFDM symbol, comprise 150 RE in the 1st the OFDM symbol; When the control channel available bandwidth is divided into 8 control subbands, in each control subband, comprise 50 RE in first OFDM symbol, comprise 75 RE in the 2nd the OFDM symbol.
When N=3, when the control channel available bandwidth is divided into 4 control subbands, in each control subband, comprise 100 RE in the 0th the OFDM symbol, comprise 150 RE in the 1st the OFDM symbol, comprise 150 RE in the 2nd the OFDM symbol.
In addition, M the control subband of dividing on frequency direction, can be numbered according to frequency order.For example: from the high frequency to the low frequency or from the low frequency to the high frequency, number consecutively is the 0th, the 1, to M-1 control subband.
Step 504 is divided into M CRB unit with CRB.
In this step, be example with step 501 cited situation to the step 503, and hypothesis N=3, M=4, then CRB can be divided (preferably, can evenly divide) is 4 CRB unit, each CRB cell size U=8, the RE quantity v of CRB unit on N OFDM symbol 0, v 1..., v N-1Value be: v 0=2, v 1=3, v 2=3.
Step 505 according to the RE quantitative proportion that can be used for the control channel transmission in N the OFDM symbol, is controlled M CRB unit maps in the subband at M.
With the cited situation of step 503 is example, and the RE quantitative proportion that can be used for the control channel transmission in N OFDM symbol is O 0: O 1: ...: O N-1=2: 3: 3, when controlling in the subband for M, preferably, a CRB unit maps was in a control subband with M CRB unit maps.For example, when controlling in the subband for one, 8 RE shine upon 2 RE in the 0th OFDM symbol with a CRB unit maps, 3 RE of mapping in the 1st the OFDM symbol, 3 RE of mapping in the 2nd the OFDM symbol.And can be set in advance in the frequency offset when shining upon in each symbol.As: when in the 0th symbol, shining upon, be offset 1 RE, when in the 1st symbol, shining upon, be offset 10 RE, when in the 2nd symbol, shining upon, 20 RE of skew etc.
In addition, in order to realize the interference randomization of minizone, but a frequency offset sequence of each cell allocation F={f 0, f 1..., f N-1, as the corresponding offset sequence of control subband, wherein, f i(0≤f i≤ P-1) be the frequency offset amount of i control subband correspondence.
In addition, step 505 can also for: with each RE of control in subband, according to the RE quantity v of CRB unit on N OFDM symbol 0, v 1..., v N-1Value, evenly be divided into P control unit, then with each CRB unit maps control subband control unit in.Be in the present embodiment, the big I of each OFDM symbol inner control unit is consistent with the RE quantity of CRB unit in each OFDM symbol.
With the cited situation of step 503 is example, with each control RE in subband according to v 0, v 1..., v N-1Value evenly be divided into P control unit, then each control subband in, can divide 100 a ÷ 2=50 control unit, i.e. P=50.And can be on frequency direction to P control unit being divided, be numbered according to frequency order (from the low frequency to the high frequency, or from the high frequency to the low frequency), and remember that this is numbered the physics numbering.
With each CRB unit maps control subband control unit in the time, the control unit sequenced collection can be set; According to the size of CRB unit, mutually disjoint subclass in the intercepting control unit sequenced collection; In the control unit of CRB unit maps in the intercepting subclass.Set control unit sequenced collection can be consistent with the control unit sequenced collection enumerated in the step 203, other control unit sequenced collection also can be set, and the control unit sequenced collection can be the set that is provided with according to even mapping principle, also can be the set that is provided with according to non-homogeneous mapping principle.
For example, control unit sequenced collection in the present embodiment is set according to the control unit sequenced collection B that enumerates in the step 203, in the present embodiment, N=3, M=4 supposes f 0=0, f 1=3, f 2=4; f 3=2; l 0=0, l 1=2, l 2=5.The control unit sequenced collection then is set is: S={C (0,0,0,0), and C (0,1,2,0), C (0,2,5,0), C (1,0,0,3), C (1,1,2,3), C (1,2,5,3), C (2,0,0,4), C (2,1,2,4), C (2,2,5,4), C (3,0,0,2), C (3,1,2,2), C (3,2,5,2), C (0,0,1,0) ..., C (3,2, mod (5+49,50), 2)).
Referring to Fig. 6, the running time-frequency resource mapping structure schematic diagram of Fig. 6 when shining upon according to control unit sequenced collection S.The subclass s1={C (0,0,0,0) of intercepting S set, C (0,1,2,0), C (0,2,5,0) }, with first CRB unit maps of first CRB in the subclass corresponding control unit that is intercepted; The subclass s2={C (1,0,0,3) of intercepting S, C (1,1,2,3), C (1,2,5,3) }, with second CRB unit maps of first CRB in the subclass corresponding control unit that is intercepted; The subclass s3={C (2,0,0,4) of intercepting S, C (2,1,2,4), C (2,2,5,4) }, with the 3rd the CRB unit maps of first CRB in the subclass corresponding control unit that is intercepted; The subclass s4={C (3,0,0,2) of intercepting S, C (3,1,2,2), C (3,2,5,2) }, with the 4th the CRB unit maps of first CRB in the subclass corresponding control unit that is intercepted.So far, first CRB mapping finishes, shown in the control unit lattice that filling pattern among the figure is oblique line.Afterwards, when shining upon second CRB, intercept four corresponding respectively subclass of back 12 elements of S set successively, with four CRB unit maps of second CRB in the respective subset corresponding control unit, shown in the control unit lattice that filling pattern among the figure is horizontal line.The rest may be inferred, finishes up to control channel can all be shone upon with control unit.
Afterwards, the user is controlled signaling bear in an integer CRB that has shone upon.
More than the method for control channel resource mapping in the specific embodiment of the invention one is described in detail, again the system of control channel resource mapping in the specific embodiment of the invention one is described in detail below.
System in this specific embodiment is consistent with the description in the system shown in Figure 4.Difference is, the CRB mapping device in this specific embodiment system, and promptly the control channel resource mapping apparatus specifically comprises: CRB dividing elements module and CRB mapping block.As shown in Figure 7, Fig. 7 is the structural representation of CRB mapping device in the specific embodiment of the invention one.
Wherein, CRB dividing elements module, be used for according to the RE quantitative proportion that can be used for the control channel transmission in each available OFDM symbol, determine the size of the CRB unit that CRB can divide, according to determined CRB cell size, CRB is divided into M CRB unit, and M value and CRB cell size information are offered the CRB mapping block.
The CRB mapping block, the M value and the CRB cell size information that provide according to CRB dividing elements module is provided, control channel available bandwidth in the available OFDM symbol is divided into M control subband, and M the CRB unit maps of desire being shone upon the CRB of C RE controlled in the subband at described M.Preferably, can be in a control subband with a CRB unit maps.Concrete mapping process can be consistent with the description in the step 505 in the flow process shown in Figure 5.
Specific embodiment two:
Referring to Fig. 8, Fig. 8 is the flow chart of control channel method for mapping resource in the specific embodiment of the invention two.In the present embodiment, still hypothesis has pre-determined the size of CRB according to the method for describing in the step 201.As shown in Figure 8, this flow process comprises the steps:
Step 801, according to the RE quantitative proportion that can be used for the control channel transmission in N the available OFDM symbol, when determining that the RE in each OFDM symbol is divided into control unit, the big or small u of each available OFDM symbol inner control unit 0, u 1..., u N-1
Suppose that the RE quantity that can be used for control channel in n the OFDM symbol is respectively O 0, O 1..., O N-1, when then the RE in N OFDM symbol in each control subband being divided into the individual equal-sized control unit of P, the big or small u of each available OFDM symbol inner control unit 0, u 1..., u N-1, satisfy relational expression u 0: u 1: ...: u N-1=O 0: O 1: ...: O N-1
Suppose to have only in first OFDM symbol 84 subcarriers to can be used for control channel, all have 168 subcarriers to can be used for control channel in other N-1 the OFDM symbol.Then when N=2, the size of the control unit of dividing on two OFDM symbols satisfies u 0: u 1=84: 168=1: 2, can get u 0=1, u 1=2 or u 0=2, u 1=4 etc.; When N=3, u 0: u 1: u 2=84: 168: 168=1: 2: 2, can get u 0=1, u 1=2, u 2=2 or u 0=2, u 1=4, u 2=4 etc.
In this step, suppose N=3, and hypothesis is got u 0=4, u 1=8, u 2=8.
Step 802 is according to the big or small u of each available OFDM symbol inner control unit of determining 1, u 2..., u N, determine the control subband number M that the control channel available bandwidth is divided.
In the present embodiment, can calculate according to formula (2) or formula (3).The size of supposing CRB still is 40 RE, and supposes that R gets 2, then according to formula (2), promptly M = C × N ( u 0 + u 1 + . . . . . . + u N - 1 ) × R Calculate M=3.Perhaps, also can calculate according to formula (3).
Step 803 is divided into M control subband with the control channel available bandwidth in the available OFDM symbol.
Still be example, when the control channel available bandwidth is divided into 3 control subbands, in each control subband, comprise 28 RE in the 0th the OFDM symbol, comprise 56 RE in the 1st the OFDM symbol, comprise 56 RE in the 2nd the OFDM symbol with N=3.And M the control subband of dividing on frequency direction, can be numbered according to frequency order.For example: from the high frequency to the low frequency or from the low frequency to the high frequency, number consecutively is the 0th, the 1, to M-1 control subband.
Step 804 is according to the big or small u of each available OFDM symbol inner control unit of determining 0, u 1..., u N-1, the RE in each OFDM symbol in each control subband is divided into P equal-sized control unit.
In this step, according to the value u in the step 701 0=4, u 1=8, u 2=8, the RE in each OFDM symbol in each control subband is divided into 7 equal-sized control units.Can be on frequency direction to P control unit being divided, be numbered according to frequency order (from the low frequency to the high frequency, or from the high frequency to the low frequency), and remember that this is numbered the physics numbering
Step 805 is provided with the control unit sequenced collection, the principle of in an integer control unit, shining upon according to CRB, mutually disjoint subclass in the intercepting control unit sequenced collection, with CRB be mapped in intercept in the subclass corresponding control unit.
In this step, set control unit sequenced collection can be consistent with the control unit sequenced collection enumerated in the step 203, other control unit sequenced collection also can be set, and the control unit sequenced collection can be the set that is provided with according to even mapping principle, also can be the set that is provided with according to non-homogeneous mapping principle.
For example, control unit sequenced collection in the present embodiment is set according to the control unit sequenced collection D that enumerates in the step 203, in the present embodiment, N=3, M=3, and hypothesis f 0=0, f 1=3, f 1=4.It is G={C (0,0,0) that the control unit sequenced collection then is set, C (1,1,0), and C (2,2,0), C (0,0,1), C (1,1,1), C (2,2,1) ....Wherein, in 3 control subbands the logic sequence number be 0 control unit corresponding respectively be that the physics sequence number is 0,3,4 control unit; The logic sequence number be 1 control unit corresponding respectively be that the physics sequence number is 1,4,5 a control unit etc.
Referring to Fig. 9, the running time-frequency resource mapping structure schematic diagram of Fig. 9 when shining upon according to control unit sequenced collection G.Because in the present embodiment, the CRB size is 40 o'clock, need take the resource of 6 control units, then the subclass g1={C (0,0 of G is gathered in intercepting, 0), C (1,1,0), C (2,2,0), C (0,0,1), C (1,1,1), C (2,2,1) }, first CRB is mapped in the subclass corresponding control unit that is intercepted, and so far, first CRB mapping finishes, shown in the control unit lattice that filling pattern among the figure is oblique line and horizontal line.Afterwards, when shining upon second CRB, the corresponding respectively subclass of back 6 elements of intercepting set G is mapped to institute with second CRB and intercept in the subclass corresponding control unit successively, and the rest may be inferred, up to control channel can be finished with whole mapping of control unit.
If each CRB is made up of 3 control units, then the filling pattern with preceding 3 correspondences in the sequenced collection of first CRB mapping is in the control unit of oblique line, the filling pattern that second CRB is mapped to ensuing 3 correspondences in the sequenced collection is in the control unit of horizontal line, and in like manner other CRB is mapped on the control unit in the respective sequence set subclass.
If CRB need be made up of 4 control units, then first CRB is mapped to preceding 4 corresponding control unit in the sequenced collection, after then it takies three control units on the control subband, returns the 0th control subband and takies a control unit more according to the order of sequence.Second CRB be mapped to subsequently 4 CRB then its first control unit that takies be arranged in the 1st control subband.
Afterwards, the user being controlled signaling bear transmits in an integer CRB that has shone upon.
In the foregoing description, determine the size of control unit earlier, the M value that the back is determined; Also can determine the value of M earlier, and then determine the size of control unit according to formula (2) or formula (3).In the practical application, can also choose the size of the two simultaneously, adjust according to formula (2) or formula (3) then, determine final value.
More than the method for control channel resource mapping in the specific embodiment of the invention two is described in detail, again the system of control channel resource mapping in the specific embodiment of the invention two is described in detail below.
System in this specific embodiment is consistent with the description in the system shown in Figure 4.Difference is, the CRB mapping device in this specific embodiment system, and promptly the control channel resource mapping apparatus specifically comprises: control unit size determination module and CRB mapping block.As shown in figure 10, Figure 10 is the structural representation of CRB mapping device in the specific embodiment of the invention two.
Wherein, control unit size determination module, be used for according to the RE quantitative proportion that can be used for the control channel transmission in N the available OFDM symbol, when determining that the RE in each OFDM symbol is divided into P control unit, the size of the control unit in each OFDM symbol, and the control unit size information of being divided offered the CRB mapping block.Wherein, determine that the process of control unit size can be consistent with the description in the step 801 in the flow process shown in Figure 8.
The CRB mapping block, be used for dividing the control unit size information that module provides according to control unit, control channel available bandwidth in the available OFDM symbol is divided into M control subband, all be divided into P control unit in each each OFDM symbol of control subband, the CRB that desire is shone upon C RE is mapped in the control unit of control subband.Wherein, dividing the process of controlling subband and control unit can be consistent to the description in 805 with the step 802 in the flow process shown in Figure 8.
Specific embodiment three:
Referring to Figure 11, Figure 11 is the flow chart of control channel method for mapping resource in the specific embodiment of the invention three.In the present embodiment, still hypothesis has pre-determined the size of CRB according to the method for describing in the step 201.As shown in figure 11, this flow process comprises the steps:
Step 1101 is divided into M control subband with the control channel available bandwidth in the available OFDM symbol.
In the present embodiment, can rule of thumb be worth or the value of M is determined in actual demand, then the control channel available bandwidth in the available OFDM symbol is divided into M control subband.And M the control subband of dividing on frequency direction, can be numbered according to frequency order.For example: from the high frequency to the low frequency or from the low frequency to the high frequency, number consecutively is the 0th, the 1, to M-1 control subband.
Step 1102 is divided into P equal-sized control unit with the RE in each OFDM symbol in each control subband.
In the present embodiment, the whole RE in the control subband can be divided, also can only will control the RE that is used for the control channel transmission in the subband and divide.Wherein, the value of P can be provided with as required.
Suppose that available OFDM symbol is N, if whole RE that will control in the subband divide, the equal and opposite in direction of N OFDM symbol inner control unit then is as if being expressed as u respectively 0, u 1..., u N-1, u then 0: u 1: ...: u N-1=1: 1: ...: 1.Then can arbitrarily determine the value of P and the size of control unit as required.
Divide if only will control the RE that is used for the control channel transmission in the subband, then can determine the magnitude proportion of N OFDM symbol inner control unit according to the RE quantitative proportion that can be used for the control channel transmission in each available OFDM symbol.Suppose that the RE quantity that can be used for control channel in n the OFDM symbol is respectively O 0, O 1..., O N-1, if the size of N OFDM symbol inner control unit is used u respectively 0, u 1..., u N-1Relational expression u is then satisfied in expression 0: u 1: ...: u N-1=O 0: O 1: ...: O N-1Determine u 0, u 1..., u N-1Size, further determine the value of P.Wherein, determine u 0, u 1..., u N-1Big or small the time, also can determine according to the relational expression of formula (2) or formula (3).
Perhaps the value of P preestablishes, and determines control unit u according to the P value afterwards 0, u 1..., u N-1Size.
P control unit being divided on frequency direction, is numbered according to frequency order (from the low frequency to the high frequency, or from the high frequency to the low frequency), and remembers that this is numbered the physics numbering.
Step 1103 is provided with the control unit sequenced collection; According to the principle that CRB shines upon in an integer control unit, mutually disjoint subclass in the intercepting control unit sequenced collection; With CRB be mapped in intercept in the subclass corresponding control unit.
In this step, set control unit sequenced collection can be consistent with the control unit sequenced collection enumerated in the step 203, other control unit sequenced collection also can be set, and the control unit sequenced collection can be the set that is provided with according to even mapping principle, also can be the set that is provided with according to non-homogeneous mapping principle.
For example, suppose N=3, M=3, P=7, the control unit number that each CRB takies is 9, and the frequency offset on each OFDM symbol is 0,2,5 control units in the hypothesis control subband, the frequency offset of each control subband is respectively 1,3,4 control units.If the control unit sequenced collection that is provided with in the similar specific embodiment one is: H={C (0,0,0,0), C (0,1,2,0), C (0,2,5,0), C (1,0,0,3), C (1,1,2,3), C (1,2,5,3), C (2,0,0,4), C (2,1,2,4), C (2,2,5,4), C (0,0,1,0) ..., C (3,2, mod (5+6,7), 4)).
Referring to Figure 12, the running time-frequency resource mapping structure schematic diagram of Figure 12 when shining upon according to control unit sequenced collection H.The subclass h1={C (0,0,0,0) of intercepting set H, C (0,1,2,0), C (0,2,5,0), C (1,0,0,3), C (1,1,2,3), C (1,2,5,3), C (2,0,0,4), C (2,1,2,4), C (2,2,5,4) }, first CRB is mapped in the plain corresponding control unit of preceding 9 bits that sequenced collection intercepts, shown in the control unit lattice that filling pattern among Figure 11 is oblique line, and second CRB can be mapped in the plain corresponding control unit of 9 arbitrarily continuous bits of sequenced collection back, in the present embodiment, what choose is follow-up 9 bit elements after first CRB intercepting, the mapping resource is shown in the control unit lattice that filling pattern among the figure is horizontal line.The rest may be inferred, finishes up to control channel can all be shone upon with control unit, in the mapping process, if run into the RE that has non-control channel to use in the OFDM symbol, then skips this RE, the RE below continuing to shine upon.
Afterwards, the user is controlled signaling bear in an integer CRB that has shone upon.
More than the method for control channel resource mapping in the specific embodiment of the invention three is described in detail, again the system of control channel resource mapping in the specific embodiment of the invention three is described in detail below.
System in this specific embodiment is consistent with the description in the system shown in Figure 4.Difference is, the CRB mapping device in this specific embodiment system, and promptly the control channel resource mapping apparatus specifically comprises: control unit is divided module and CRB mapping block.As shown in figure 13, Figure 13 is the structural representation of CRB mapping device in the specific embodiment of the invention three.
Wherein, control unit is divided module, be used for the control channel available bandwidth in the available OFDM symbol is divided into M control subband, the RE in each OFDM symbol in each control subband be divided into P equal-sized control unit, and institute's divided information is offered the CRB mapping block.Wherein, partition process can be consistent to the description in the step 1102 with step 1101 in the flow process shown in Figure 11.
The CRB mapping block is used for dividing the division information that module provides according to control unit, and the principle according to CRB shines upon in an integer control unit is mapped in control unit with CRB and divides in the control unit of being divided in the module.Mapping process can be consistent with the description in the step 1103 in the flow process shown in Figure 11.
Among embodiment two and the embodiment three, when N changed, for example N=2 in order to reduce system complexity, still kept M=3, P=7.
If the control unit inner control channel on each OFDM symbol can be identical with the quantity of RE, then the control unit quantity that CRB needs when N=2 remains unchanged, and, supposes that for embodiment two be 3 control units that is, is 9 control units for embodiment three.
The control unit sequenced collection of CRB mapping can reset, and for example, in embodiment two, when N=2, the control unit sequenced collection is G={C (0,0,0), C (1,1,0), C (2,0,0), C (0,0,1), C (1,1,1), C (0,0,1), ..., wherein control unit be numbered logical number, referring to Figure 14, Figure 14 is the structural representation of another running time-frequency resource mapping among the embodiment two.As shown in figure 14, with the filling pattern of preceding 3 correspondences in the sequenced collection of first CRB mapping is in the control unit of oblique line, the filling pattern that second CRB is mapped to ensuing 3 correspondences in the sequenced collection is in the control unit of horizontal line, and in like manner other CRB is mapped on the control unit in the respective sequence set subclass.In embodiment three, the set of control sequence of unit is H={C (0,0,0,0) when N=2, and C (0,1,2,0), C (1,0,0,3), C (1,1,2,3), C (2,0,0,4), C (2,1,2,4), C (0,0,1,0) ..., C (3,1, mod (2+6,7), 3)) }, wherein control unit is numbered the physics numbering.Referring to Figure 15, Figure 15 is the structural representation of another running time-frequency resource mapping among the embodiment three.As shown in figure 15, with the filling pattern of preceding 9 correspondences in the sequenced collection of first CRB mapping is in the control unit of oblique line, the filling pattern that second CRB is mapped to ensuing 9 correspondences in the sequenced collection is in the control unit of horizontal line, and in like manner other CRB is mapped on the control unit in the respective sequence set subclass.
The control unit sequenced collection of setting when the control unit sequenced collection of CRB mapping also can adopt N=3 when carrying out the CRB mapping, is skipped the control unit of N=3.For example, for embodiment two, when N=2, first CRB corresponding control unit subclass is { C (0,0,0), C (1,1,0), C (0,0,1) }, promptly among Fig. 9 the 0th control subband filling pattern be the control unit of oblique line, the control unit that first control subband filling pattern is an oblique line and the 0th control subband filling pattern are the control unit of horizontal line.Second CRB is filled to the control unit mapping of horizontal line since the 1st control subband.
If the control unit inner control channel on each OFDM symbol can be used the different identical of RE, suppose that according to ratio the size of the control unit of 3 OFDM symbols is respectively 2,3,3 RE.For embodiment two, the CRB size is 8 RE, and for embodiment three, the CRB size is 24 RE.Then when N=2, in order to keep the big or small constant of CRB, the control unit quantity of CRB mapping will change.For example, suppose to reset the control unit sequenced collection, for embodiment two, the RE quantity of preceding 3 the control unit correspondences of control unit sequenced collection of new settings is 2+3+2=7, the RE quantity that is less than the CRB needs, therefore also to account for the 4th control unit in the control unit sequenced collection again, and only take a subcarrier in this control unit.Then, CRB corresponding control unit subclass is { C (0,0,0), C (1,1,0), C (0,0,1), C (1,1,1) }, promptly among Figure 14 filling pattern be oblique line control unit and control subband 0 in filling pattern be the control unit of horizontal line.For embodiment three, in like manner take the control unit of respective numbers according to the RE quantity of CRB.
Above-mentionedly just control channel method for mapping resource and system in the embodiment of the invention are described in detail by three specific embodiments.In the practical application, specific embodiment can also have a variety of, when for example control unit being unified to number, the embodiment of control unit sequenced collection etc. is set, these embodiment all can implement with reference to the scheme of above-mentioned three specific embodiments, therefore no longer give unnecessary details herein.Among the present invention, determining of M value and choosing etc. of P value can be according to actual needs in advance by defaults.Cited example in the above-mentioned specific embodiment, mostly correlation between each value is the relation that divides exactly, in the practical application, sometimes not necessarily just in time be to divide exactly relation, as the initial CRB size of determining is 38, the M value is 4, P is 10, and have only 400 subcarriers to can be used for control channel in the 0th OFDM symbol of control channel available bandwidth, all there are 600 subcarriers to can be used for control channel in other N-1 the OFDM symbol, then the 0th OFDM symbol inner control cell size is 10, and other N-1 OFDM symbol inner control cell size is even 15, if hypothesis N is 3, then CRB roughly is made up of 3 control units, but three control units add up to 10+15+15=40, and visible CRB can not just in time be made up of an integer control unit, at this moment, can adjust each value, as the CRB size being defined as 40, control signaling bear afterwards on an integer CRB time, but the through-rate coupling is adjusted.Perhaps P is adjusted into 25, then the 0th OFDM symbol inner control cell size is 4, and other N-1 OFDM symbol inner control cell size is 6 etc.
Technical scheme in the embodiment of the invention, in order to obtain frequency diversity gain, interference randomization and power-balance, each user's control signaling can be dispersed on the whole available running time-frequency resource, be on The whole control channel available bandwidth and N the available OFDM symbol, and different districts distributes different random sequences, has improved the antijamming capability between the sub-district.In addition, the technical scheme in the embodiment of the invention, the running time-frequency resource that can take according to the dynamic or semi-static adjustment control channel of scheduling situation.For example, adjust OFDM symbol numbers N or control subband number (subcarrier number), thereby make running time-frequency resource to be utilized effectively.And, the technical scheme in the embodiment of the invention, owing to keep the CRB size constant, thus also reduced encoder complexity.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, and is within the spirit and principles in the present invention all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (20)

1. the method for control channel resource mapping is characterized in that this method comprises:
Control channel available bandwidth in control channel N the available orthogonal frequency division multiplexing multiple access OFDM symbol is divided into M control subband;
Be defined as shining upon size on C the Resource Unit of control resource block mapping in described M control subband of C Resource Unit;
Control channel distribution integer control Resource Block for bearer control signalling is mapped in described control channel on the resource of the control resource block mapping of being distributed, and wherein, M, N, C are respectively the integer greater than 0.
2. the method for claim 1, it is characterized in that, described will control resource block mapping on C the Resource Unit of described M control in the subband before, further comprise: according to the control channel resource requirement of the control signaling of carrying various forms, according to the principle of a described control channel resource occupation integer control Resource Block control Resource Block, determine the size of described C.
3. the method for claim 1 is characterized in that, described with the control channel available bandwidth be divided into M control subband before, further comprise:
According to the ratio of the Resource Unit quantity that can be used for the control channel transmission between each the OFDM symbol in described N the OFDM symbol, determine the ratio of the Resource Unit quantity of described control Resource Block on described each OFDM symbol;
According to the ratio of the Resource Unit quantity of determined control Resource Block on each OFDM symbol, determine the Resource Unit quantity U of the control Resource Block unit desire mapping that described control Resource Block can be divided, wherein U is the natural number less than C;
Determine that the control subband number M that the control channel available bandwidth is divided is the smallest positive integral more than or equal to C/U.
4. the method for claim 1 is characterized in that, described with the control channel available bandwidth be divided into M control subband before, further comprise:
Determine the big or small u of the control unit that desire is divided in each available OFDM symbol 1, u 2..., u N
Determine control subband number M that the control channel available bandwidth divides for more than or equal to
Figure A2007101015860003C1
Smallest positive integral, wherein, R is any positive integer.
5. the method for claim 1 is characterized in that, described the control channel available bandwidth is divided into before M the control subband, further comprises: set in advance the control subband number M that the control channel available bandwidth is divided.
6. as claim 1,2 or 3 described methods, it is characterized in that, describedly on C the Resource Unit of M control in the subband be determined control resource block mapping:
To control Resource Block and be divided into M control Resource Block unit;
According to the ratio of the Resource Unit quantity that can be used for the control channel transmission between each the OFDM symbol in described N the OFDM symbol, described M control Resource Block unit maps controlled in the subband at described M.
7. as claim 1,2,3,4 or 5 described methods, it is characterized in that the described process of Resource Block control resource block mapping on Resource Unit of will controlling is specially:
Resource Unit in N OFDM symbol in each control subband is divided into the individual equal-sized control unit of P, and wherein P is a natural number;
Setting comprises the sequenced collection of the described control unit of control unit information;
Control the principle that Resource Block takies an integer control unit according to each, intercept mutually disjoint subclass in the described sequenced collection;
With described control resource block mapping in the subclass corresponding control unit that is intercepted on the control channel available resource units.
8. method as claimed in claim 7, it is characterized in that, described control unit information comprises: control sub-band information, OFDM symbolic information and control unit offset information, wherein, described control unit offset information comprises: the control sub-bands of frequencies offset information that each sub-district is specific, and/or, the OFDM symbol frequency offset information that each sub-district is specific;
Perhaps, described control unit information comprises: control sub-band information and control unit offset information, wherein, described control unit offset information comprises: the control unit sequence number offset information that each sub-district is specific.
9. method as claimed in claim 7 is characterized in that, when N was variable, described control unit sequenced collection was: the different control unit sequenced collection that the different values of corresponding N are set respectively.
10. method as claimed in claim 7 is characterized in that, when N was variable, described control unit sequenced collection was: the maximum possible value of corresponding N, the control unit sequenced collection of setting;
Then as N during less than its maximum possible value, mutually disjoint subclass is in the described intercepting control unit sequenced collection: intercept the control unit in the control unit sequenced collection in order, if run into greater than the control unit on the OFDM symbol of the current value of N, skip this unit, then choose next control unit, selected control unit is constituted the set subclass.
11. method as claimed in claim 7 is characterized in that, when the control subband number of reality use was variable, described control unit sequenced collection was: the different control unit sequenced collections that corresponding different control subband numbers are set respectively.
12. method as claimed in claim 7 is characterized in that, when the control subband number of reality use was variable, described control unit sequenced collection was: the maximum possible value of corresponding control subband number, the control unit sequenced collection of setting;
Then when the actual control subband number of using during less than its maximum possible value, mutually disjoint subclass is in the described intercepting control unit sequenced collection: intercept the control unit in the control unit sequenced collection in order, if run into the control unit on the current unavailable control subband, skip this unit, then choose next control unit, selected control unit is constituted the set subclass.
13. method as claimed in claim 7 is characterized in that, describedly Resource Unit in N OFDM symbol in each control subband is divided into the individual equal-sized control unit of P is:
All Resource Units in N OFDM symbol in each control subband are divided into the individual equal-sized control unit of P;
Perhaps be: the Resource Unit that is used for the control channel transmission in N OFDM symbol in each control subband is divided into the individual equal-sized control unit of P.
14. as claim 1,2,3,5 or 6 described methods, it is characterized in that, described control channel for bearer control signalling distributes an integer control Resource Block to be: according to the form of control signaling, for each control channel distributes the successive control Resource Block, and/or, for the control channel with identical control signaling format distributes the successive control Resource Block.
15. method as claimed in claim 14 is characterized in that, this method further comprises: the original position of indicating the control Resource Block that control channel distributed of various forms by default signaling; Perhaps, the control channel that is redefined for low code check distributes the control Resource Block of low sequence number.
16. the system of a control channel resource mapping is characterized in that this system comprises:
The CRB mapping device, be used for the control channel available bandwidth in control channel N the available OFDM symbol is divided into M control subband, size is defined as shining upon on C the Resource Unit of control resource block mapping in described M control subband of C Resource Unit, and will controls resource block mapping information and offer and control the signaling bear device;
Control signaling bear device, the control resource block mapping information that provides according to the CRB mapping device is provided, control channel distribution integer control Resource Block for bearer control signalling, described control channel is mapped on the resource of the control resource block mapping of being distributed, wherein, M, N, C are respectively the integer greater than 0.
17. system as claimed in claim 16, it is characterized in that, this system further comprises: the CRB size is determined device, be used for control channel resource requirement according to the control signaling of the various forms of carrying, principle according to a described control channel resource occupation integer control Resource Block, determine the Resource Unit number C of control Resource Block desire mapping, and determined C value information is offered the CRB mapping device;
Described CRB mapping device is determined the described operation that will control on C the Resource Unit of resource block mapping in described M control subband of C value information execution that device provides according to the CRB size.
18. the device of a control channel resource mapping is characterized in that this device comprises:
CRB dividing elements module, be used for according to the Resource Unit quantitative proportion that can be used for the control channel transmission in each available OFDM symbol, determine the size of the control Resource Block unit that the control Resource Block can be divided, according to determined control Resource Block cell size, to control Resource Block and be divided into M control Resource Block unit, and M value and control Resource Block cell size information will be offered the CRB mapping block;
The CRB mapping block, the M value that provides according to CRB dividing elements module is provided and controls Resource Block cell size information, control channel available bandwidth in the available OFDM symbol is divided into M control subband, and M the control Resource Block unit maps of desire being shone upon the control Resource Block of C Resource Unit controlled in the subband at described M.
19. the device of a control channel resource mapping is characterized in that this device comprises:
Control unit size determination module, be used for according to the Resource Unit quantitative proportion that can be used for the control channel transmission in N the available OFDM symbol, when determining that the Resource Unit in each OFDM symbol is divided into P control unit, the size of the control unit in each OFDM symbol, and the control unit size information of being divided offered the CRB mapping block;
The CRB mapping block, be used for dividing the control unit size information that module provides according to control unit, control channel available bandwidth in the available OFDM symbol is divided into M control subband, all be divided into P control unit in each each OFDM symbol of control subband, the control resource block mapping of desire being shone upon C Resource Unit is in the control unit of control subband.
20. the device of a control channel resource mapping is characterized in that this device comprises:
Control unit is divided module, be used for the control channel available bandwidth in the available OFDM symbol is divided into M control subband, Resource Unit in each OFDM symbol in each control subband is divided into P equal-sized control unit, and institute's divided information is offered the CRB mapping block;
The CRB mapping block is used for dividing the division information that module provides according to control unit, according to the principle that the control Resource Block shines upon in an integer control unit, the control resource block mapping is divided in the control unit of being divided in the module at control unit.
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