CN102595385B - Downlink transmission method and device - Google Patents

Abstract

The invention discloses a downlink transmission method and a downlink transmission device, relating to the communication technology. After an MU-MIMO (multi-user and multiple-input multiple-output) transmission mode is determined to use, whether a single-flow beamforming transmission or a dual-flow beamforming transmission is utilized is further determined according to a channel situation, so that support of a multi-user single-flow transmission and a multi-user dual-flow transmission on TM8 (transport mode 8) is achieved and various MIMO modes under TM8 are better supported.

Description

A kind of downlink transmission method and device

Technical field

The present invention relates to the communication technology, relate in particular to a kind of downlink transmission method and device.

Background technology

In order further to strengthen descending MIMO(Multiple input multiple output, multiple-input, multiple-output) data transmission capabilities, 3GPP(3rd generation partnership project, three generations's collaborative project) LTE(Long Term Evolution, Long Term Evolution) introduce transmission mode 8(Transport Mode8, TM8 in the standard of system R9 version).

In down link, in the time that base station has configured multiple transmitting antennas and transmitter, can pass through wave beam forming or precoding technique, utilize the spatial selectivity of down channel, on identical running time-frequency resource, dispatch multiple UE(user ' s equipment simultaneously, subscriber equipment), improve the band efficiency of system, the number of users that system is supported by the mode of space division multiplexing.

In LTE R9, introduce the double-current figuration technology based on dual-port dedicated pilot, i.e. TM8.Stipulate according to standard, TM8 adopts antenna port Port7, Port8 to transmit, the DRS (Dedicated Reference Signal) of these two ports occupies identical running time-frequency resource position, but take different orthogonal mask code sequences to distinguish, and by the descending scheduling signaling DCI format2B(downlink control information format2B of TM8, descending control information format 2B) in parameter scrambler ID(Identifier, mark) carry out the initialization of scrambler.On this basis, base station can be dispatched the UE of two single-stream transmission respectively at mutually orthogonal UE-specific RS(UE-specific reference signal, user-specific reference signal) form MU-MIMO(Multi-user MIMO, multiuser MIMO on port).And by the scrambler initialization ID indicating in descending control signaling, at most can be by 4 single current UE or 2 double-current UE pairings.The MIMO mode of supporting under the holotype of transmission mode 8 is as shown in table 1, and wherein the most typical MIMO transmission means is 4 classes shown in Fig. 1 a-Fig. 1 d, and Fig. 1 a is SU-MIMO, comprise single port 7/8 and double-deck transmission, Fig. 1 b is MU-MIMO, dispatches 2 UE simultaneously, and the transmission of each UE individual layer, Fig. 1 c is MU-MIMO, dispatch 2 UE simultaneously, the double-deck transmission of each UE, Fig. 1 d is MU-MIMO, dispatch 4 UE, each UE individual layer transmission simultaneously.

Table 1:TM8 application scenarios is described

By contrast, LTE system is in the transmission mode of R8 kind definition, only support alone family single codeword transmission (as TM1, TM2, TM6, TM7) or only support multi-user's single codeword transmission (as TM5), or only supporting the many codeword transmission in alone family (as TM3, TM4).Because TM8 can realize the transmission of alone family single codeword, the many code words in alone family, multi-user's single codeword, the many code words of multi-user simultaneously, so TM8 has higher requirement for the design of descending scheduling algorithm.

In current disclosed LTE system call algorithm, its basic ideas comprise following two steps, that is: first according to the data volume of all kinds of downlink business of UE and QoS(Quality of Service, service quality) demand domain scheduling while carrying out, generate the priority query of UE; Then the UE being followed successively by priority query carries out frequency domain dispatching, distributes corresponding frequency domain resource.

In the time of Resources allocation, consider the information such as downlink transfer pattern, channel quality of UE, be defined as UE schedule of apportionment code source or many code sources of current scheduling, simultaneously for supporting the UE of MU-MIMO to consider whether to use the resource of multiuser multiplexing.The current descending scheduling algorithm of LTE system can meet the demand of the downlink transfer pattern that function is comparatively single substantially, but needs further to strengthen for the supporting dynamics of TM8.

Because the MIMO mode that TM8 supports is versatile and flexible, and can realize the quick switching of alone family/multi-user, single current/double fluid, existing dispatching algorithm does not take into full account the various MIMO modes that TM8 supports, therefore can not make full use of the transmittability of TM8, current descending scheduling algorithm only can be supported part MIMO mode in TM8 flow process, as alone family single current (single codeword), alone family double fluid (many code words), its tenability for multi-user's single current is very poor, and does not support multi-user's stream transmission.

Summary of the invention

The embodiment of the present invention provides a kind of downlink transmission method and device, better to support various MIMO modes under TM8.

A kind of downlink transmission method, comprising:

Determine and activate multi-user's multiple-input and multiple-output MU-MIMO transmission;

Determine and adopt the transmission of single current figuration or the transmission of double-current figuration according to channel situation;

For user carries out, time-domain resource is distributed and frequency domain resource is distributed;

Pass through distributed resource and carry out downlink data transmission.

A kind of downlink transfer device, comprising:

Multi-user transmission determining unit, activates multi-user's multiple-input and multiple-output MU-MIMO transmission for determining;

Stream transmission determining unit, adopts the transmission of single current figuration or the transmission of double-current figuration for determining according to channel situation;

Resource allocation unit, is used to user to carry out time-domain resource distribution and frequency domain resource is distributed;

Data transmission unit, carries out downlink data transmission for passing through distributed resource.

The embodiment of the present invention provides a kind of downlink transmission method and device, determining after use MU-MIMO transmission means, further determine it is to adopt the transmission of single current figuration or the transmission of double-current figuration according to channel situation, thereby realize and on TM8, support multi-user's single-stream transmission and multi-user's stream transmission, better support various MIMO modes under TM8.

Accompanying drawing explanation

Fig. 1 a-Fig. 1 d is the MIMO mode schematic diagram that in prior art, transmission mode 8 is supported;

The downlink transmission method flow chart that Fig. 2 provides for the embodiment of the present invention;

The downlink transfer apparatus structure schematic diagram that Fig. 3 provides for the embodiment of the present invention.

Embodiment

The embodiment of the present invention provides a kind of downlink transmission method and device, determining after use MU-MIMO transmission means, further determine it is to adopt the transmission of single current figuration or the transmission of double-current figuration according to channel situation, thereby realize and on TM8, support multi-user's single-stream transmission and multi-user's stream transmission, better support various MIMO modes under TM8.

As shown in Figure 2, the downlink transmission method that the embodiment of the present invention provides comprises:

Step S201, definite MU-MIMO of activation transmit;

Step S202, determine and adopt the transmission of single current figuration or the transmission of double-current figuration according to channel situation;

Step S203, for carrying out time-domain resource distribution and frequency domain resource, user distributes;

Step S204, pass through distributed resource and carry out downlink data transmission.

Owing to determining after activation MU-MIMO mode, the transmission of single current figuration or the transmission of double-current figuration while further determining transmission means according to channel situation, so provide more comprehensive support for various MIMO modes under TM8.

Wherein, in step S201, determine and activate MU-MIMO transmission, can determine and activate MU-MIMO transmission according to the resource-constrained situation of Physical Downlink Shared Channel PDSCH channel resource utilance, physical downlink control channel PDCCH channel resource utilance and PDSCH channel and PDCCH channel, concrete, step S201 specifically comprises:

Determine PDSCH(physical downlink control channel in measurement period, Physical Downlink Shared Channel) channel resource utilance is greater than the first threshold of setting, PDCCH(Physical Downlink Shared Channel in measurement period, Physical Downlink Control Channel) channel resource utilance is less than the Second Threshold of setting, and when the difference that the resource-constrained number of times of descending scheduling PDSCH deducts the resource-constrained number of times of descending scheduling PDCCH in the meter cycle in measurement period is greater than the 3rd threshold value, activate the descending MU-MIMO transmission in current area, descending scheduling PDSCH is resource-constrained refers to the Block due to PRB(physical Resource, Physical Resource Block) inadequate resource cause part UE can not get scheduling situation, the resource-constrained situation that can not get scheduling due to the unsuccessful UE of causing of PDCCH resource distribution that refers to of descending scheduling PDCCH.

Concrete, can first set statistics duration T _{dl_Mu_Stat}, and start periodically statistics and judgement, setting after statistics duration, when carrying out MU-MIMO transmission and activating, can use predefined statistics duration follow-up, no longer reset;

In statistic period T _{dl_Mu_Stat}in, the PRB(Physical Resource Block of statistics current area each descending sub frame PDSCH channel, Physical Resource Block) resource service condition, determine statistic period T simultaneously _{dl_Mu_Stat}the resource-constrained times N of interior descending scheduling PDSCH _{pDSCH_run_out}with the resource-constrained times N of uplink and downlink dynamic dispatching PDCCH in measurement period _{pDCCH_run_out};

When measurement period arrives, the PDSCH channel resource utilance η in the counting statistics cycle _{pRB_PDSCH}resource utilization η with PDCCH channel _{cCE_PDCCH}, then carry out descending MU-MIMO and activate judgement:

If η _{pRB_PDSCH}>TH _{dlMuMIMO_PDSCH}, and η _{cCE_PDCCH}<TH _{dlMuMIMO_PDCCH}, and N _{pDSCH_run_out}-N _{pDCCH_run_out}>TH _{run_out}, for descending MU-MIMO transmission, the measurement of indicating physical layer to be correlated with are activated in current area simultaneously;

Otherwise current area does not adopt descending MU-MIMO transmission.

Wherein:

PDSCH is resource-constrained to be referred in descending scheduling process, because PDSCH can distribute and cause part UE to can not get the situation of scheduling without PRB resource;

PDCCH is resource-constrained to be referred in uplink and downlink scheduling process, and due to the distribution of PDCCH resource, the unsuccessful UE of causing can not get the situation of dispatching;

PDSCH channel resource utilance η _{pRB_PDSCH}be defined as: cycle T _{dl_Mu_Stat}the ratio of available resources sum in the PRB number of the actual use of interior PDSCH channel and this period;

PDCCH channel resource utilance η _{cCE_PDCCH}be defined as: cycle T _{dl_Mu_Stat}the CCE(Control Channel Element of the actual use of interior PDCCH channel, control channel unit) ratio of available CCE resource sum in number and this period;

Parameter TH _{dlMuMIMO_PDSCH}, TH _{dlMuMIMO_PDCCH}and TH _{run_out}be predefined threshold value, its concrete value can be provided by network capacity planning.

In step S202, the channel information that can obtain according to channel reciprocity according to the information of terminal to report and/or base station carries out the double-current adaptive judgement of list, for the UE of TM8, the CQI information reporting of terminal has two kinds of optional modes: based on reporting of code book and reporting of non-code book, now, step S202 specifically comprises:

For adopting non-codebook mode to report CQI(Channel Quality Indicator, channel quality indication) UE of information, according to SRS(Sounding Reference Signal, detection reference signal) channel information that measures is that current UE is determined and adopted the transmission of single current figuration or the transmission of double-current figuration through Eigenvalues Decomposition;

Report the UE of CQI information for employing codebook mode, the RI(Rank Indicator reporting according to UE, the indication of order information) be that current UE determines that employing single current figuration transmits or the transmission of double-current figuration in conjunction with the feedback information of historical data transmission.

Because those skilled in the art can carry out list/double-current self-adaptive decision according to prior art, the embodiment of the present invention no longer describes in detail.

In step S203, for user carries out, time-domain resource is distributed and frequency domain resource is distributed, and specifically comprises:

Domain scheduling while carrying out according to the data volume of all kinds of downlink business of UE and QoS demand, the priority query of generation UE;

The UE being followed successively by priority query carries out frequency domain dispatching, distributes corresponding frequency domain resource.

Concrete, carry out frequency domain dispatching at the UE being followed successively by priority query, while distributing corresponding frequency domain resource, can first judge the current MU-MIMO function that whether activated in community, in the time not activating MU-MIMO function, current according to selecting factors such as channel conditions is to adopt the transmission of single current figuration or the transmission of double-current figuration, if activated MU-MIMO,, to being configured to the UE of TM8 in system, carry out transfer of data according to following scheme:

According to priority query's order, for each UE in priority query, the Resources list that is not yet assigned to any UE in subframe is defined as to alone family and can uses PRB the Resources list, form alone family and can use the set of PRB the Resources list, to distribute in the Resources list of other UE, the Resources list that the number of data layers having used is less than or equal to the predefined number of plies is defined as multi-user and can uses PRB the Resources list, forms multi-user and can use the set of PRB the Resources list;

In the time that PRB the Resources list can be used in the alone family that exists Deta bearer ability to meet current UE transfer of data demand, current UE can be distributed to PRB the Resources list in the alone family that Deta bearer ability is met to current UE transfer of data demand, and definite modulating-coding strategy MCS information;

Otherwise, in the time that PRB the Resources list can be used in the alone family that does not exist Deta bearer ability to meet current UE transfer of data demand:

PRB the Resources list can be used with the alone family of Deta bearer ability maximum in the set of PRB the Resources list in temporary alone family;

Each primary user in current UE and multi-user resource list collection is matched, and match the distribution of resource;

In the time existing Deta bearer ability to meet the Resources list of pairing primary user of current UE transfer of data demand, the Resources list that Deta bearer ability is met to the pairing primary user of current UE transfer of data demand is distributed to current UE, and definite modulating-coding strategy MCS information;

In the time not existing Deta bearer ability to meet the Resources list of pairing primary user of current UE transfer of data demand, relatively with the Resources list of the primary user of current UE pairing in multi-user's list of available resources of Deta bearer ability maximum and temporary alone family can use PRB the Resources list with the alone family of Deta bearer ability maximum in the set of PRB the Resources list, select the large the Resources list of Deta bearer ability to distribute to current UE, and definite modulating-coding strategy MCS information.

Concrete, in the time be each UE Resources allocation in priority query, first need definite candidate PRB the Resources list set:

For the PRB resource that is not yet assigned to any UE in this subframe, put it into resource collection S1, for the resource in S1, sort from high to low according to the CQI on each PRB, and according to the DCI(Downlink control information of current UE, Downlink Control Information) resource supported of form distributes type to judge the availability of resource, available resource is generated to the set of candidate PRB the Resources list, and corresponding the Resources list is designated to alone family list of available resources, corresponding the Resources list set identification is the list of available resources set of alone family.

For the PRB resource of distributing to the UE under other TM8 pattern, if its number of data layers having used is less than or equal to the parameter that MaxAllowedLayer(sets in advance, be used for controlling maximum operable number of data layers under TM8, the complexity setting that this parameter can be supported according to equipment, representative value is 4 or 2), form several the Resources lists according to primary user's resource allocation result and (suppose that i candidate PRB the Resources list is List _pRB(i), its PRB number comprising is N _pairingPRB(i)), and these the Resources lists are designated to multi-user's list of available resources, corresponding the Resources list set identification is the set of multi-user's list of available resources.

Wherein, the resource that various DCI forms are supported distributes type as shown in table 2:

Table 2: the resource that various DCI forms are supported is distributed type

DCI form	Resource is distributed type
		DCI?format1/2/2A/2B	Type0、Type1
DCI?format1A/1B/1C/1D	Type2

Wherein, the DCI form that TM8 supports comprises: DCI format1A, DCI format2B.Various resources are distributed under type, and the availability basis for estimation of resource is as follows:

For Type0, only have RBG(resource block group under PRB, Resource Block group) in all PRB all can use, this PRB is just available;

For Type1, selected PRB must be positioned at same addressing space;

For Type2, selected PRB must meet VRB(Virtual Resource Block, virtual resource blocks) continuous requirement.

Various resources distribute the availability judgement of resource under type to be well known to those skilled in the art, and no longer describe in detail herein.

In the time being current UE Resources allocation, if the list of available resources set of alone family is not empty, in the list of available resources set of alone family, selects successively resource to carry out resource distribution, and calculate the Deta bearer ability of institute's Resources allocation; If the Deta bearer ability of institute's Resources allocation can meet the transfer of data demand of UE current to be dispatched, the resource that resource in alone family the Resources list of selecting to distribute is used in this downlink data transmission process as this UE, determine MCS(Modulation Code Scheme simultaneously, modulating-coding strategy) etc. information, and determine that this resource is distributed and finish;

If the Deta bearer ability of institute's Resources allocation can not meet the transfer of data demand of UE current to be dispatched, temporary current alone family resource allocation result, and proceed multi-user resource and distribute.

Multi-user resource divides timing, if the set of multi-user's list of available resources is not empty, for each the Resources list in the set of multi-user's list of available resources, obtain the information of each main UE on this Resources list, carry out the resource pairing judgement of the MU-MIMO of this UE and each main UE, complete the selection of pairing the Resources list.

If there are multiple main UE on some the Resources lists, in the time carrying out UE pairing decision-making, need to guarantee that pairing UE and any main UE meet the condition of MU-MIMO pairing transmission; On this Resources list, call when UE matches decision-making module and return to the unsuccessful mark of pairing if having between pairing UE and any one main UE, current UE is matched unsuccessfully on this Resources list, and current UE can not be used the resource in the list of this multi-user resource.

If multi-user resource allocation result is not empty, the Deta bearer ability of the multi-user resource of dispensed: if the Deta bearer ability of institute's Resources allocation can meet the transfer of data demand of UE current to be dispatched, the resource that resource in the multi-user resource list of selecting to distribute is used in this downlink data transmission process as this UE, determine the information such as MCS simultaneously, determine that this resource distribution finishes;

If the Deta bearer ability of multi-user resource can not meet the transfer of data demand of UE, obtain temporary alone family resource allocation result, and compare with multi-user resource allocation result, and select the final resource allocation result of a conduct that Deta bearer ability is larger to determine the information such as MCS simultaneously, determine that this resource distribution finishes.

The UE of the thinking TM8 distributing according to above-mentioned resource can realize flexibly the resource of list/multiuser MIMO and distribute, and can realize flexibly the various MIMO transmission meanss in table 1.

At present, carrying out multi-user while matching, and underuse the spatial character of channel, for the wave beam forming of TM8, there is the space of further optimizing in the algorithm that matches.Current multi-user's pairing transmission only takes in frequency domain dispatching, its pairing criterion has only been considered the master/slave user's of pairing transmission wireless channel status transmission, therefore can not make full use of resource: as, suppose to meet according to the situation UE1 of wireless channel and UE2 the ability that MU-MIMO transmits, and suppose that UE1 is the primary user who has distributed resource, but the data volume that UE1 need to transmit is very large, the number of resources needing is a lot, and the number of resources that UE2 needs is little, when pairing is transmitted, consider the performance of data demodulates, require at present UE1 and UE2 to use identical resource, therefore, this pairing transmission can not make full use of the Radio Resource of system.

The embodiment of the present invention is also corresponding provides a kind of matching method, for every two UE that match, the spectrum efficiency of determining two UE is all greater than predefined absolute spectrum efficiency thresholding, and the spectrum efficiency difference of two UE is less than predefined spectrum efficiency difference threshold, and determine when the figuration vector correlation of two UE is less than predefined relevant matches thresholding, determine that working as the first two UE can match, otherwise determine that working as the first two UE can not match.

Concrete, determine that according to user's channel information etc. can multiple users use identical PRB resource to carry out transfer of data.In addition, in pairing algorithm, can also carry out according to features such as types of service the pairing of service layer.

In resource allocation process, each UE carries out resource distribution successively according to priority orders, in resource allocation process, if desired uses the resource of MU-MIMO, on corresponding Resource Block, matches trial., in identical physical resources, carry out the resource of each transport layer of MU transmission and distribute in order, and not distribute simultaneously.In the mode that this resource is distributed, carry out existing between the UE of MU-MIMO transmission primary and secondary point, wherein, at a TTI(Transmission Timing Interval, Transmission Time Interval) in determined that the UE that takies this resource is called as main UE(in a TTI, in same asset, may there are multiple main UE simultaneously), the UE that MU-MIMO pairing transmission is carried out in trial is called as pairing UE.

In the time matching, first consider channel information, comprise channel quality information, channel condition information.Be N according to the number that comprises PRB in candidate PRB the Resources list i(hypothesis the Resources list of frequency domain dispatching module output _pairingPRB(i), this number is the resource block number of main this sub-frame allocation of UE), search the CQI information of each PRB of two UE storages of current trial pairing, this CQI information is to consider up-to-date CQI to report and the later spectrum efficiency information of CQI correction and CQI reconstruction result.

For each UE(be assumed to be main UE, pairing UE be assigned as UE1 and UE2), based on UE, the spectrum efficiency information in above-mentioned resource is carried out matching respectively, obtains the average spectral efficiency (ase) eff in selected resource _{pDSCH_UE1}(i), eff _{pDSCH_UE2}(i):

${\mathrm{eff}}_{\mathrm{PDSCH}\_\mathrm{UE}1}\left(i\right)=\frac{1}{N_{\mathrm{pairingPPB}}\left(i\right)}\&CenterDot;\underset{N_{\mathrm{pairingPRB}}}{\mathrm{\&Sigma;}}{\mathrm{eff}}_{\mathrm{PDSCH}\_\mathrm{UE}2\_\mathrm{PRB}}\left(k\right)$

${\mathrm{eff}}_{\mathrm{PDSCH}\_\mathrm{UE}2}\left(i\right)=\frac{1}{N_{\mathrm{pairingPRB}}\left(i\right)}\&CenterDot;\underset{N_{\mathrm{pairingPRB}}}{\mathrm{\&Sigma;}}{\mathrm{eff}}_{\mathrm{PDSCH}\_\mathrm{UE}2\_\mathrm{PRB}}\left(k\right)$

Carry out the matching judgement of spectrum efficiency later: if | eff _{pDSCH_UE1}(i)-eff _{pDSCH_UE2}(i) |≤dlUePairEffDiffTH, eff _{pDSCH_UE1}(i) >dlPairEffTH, and eff _{pDSCH_UE2}(i) >dlUePairEffTH, can further mate; Otherwise determine that working as the first two UE does not meet matching request, wherein spectrum efficiency difference threshold dlUePairEffDiffTH, absolute spectrum efficiency thresholding dlUePairEffTH are predefined threshold value, can determine by link simulation;

If pairing UE, by the judgement of spectrum efficiency after matching, obtains the AoA(Angle of Arrival obtaining after two UE estimate SRS, the angle of arrival), calculate correlation: the AoA that supposes user 1 is θ ₁, user 2 AoA is θ ₂, N _tfor number of transmit antennas, d is antenna distance, calculates the figuration vector of UE n:

$\mathrm{bf}\_{\mathrm{ven}}_n=\exp (j\&CenterDot;2\mathrm{\&pi;}\&CenterDot;[1]:N_t\&CenterDot;d\&CenterDot;\sin \left({\mathrm{\&theta;}}_n\right))/\sqrt{N_t}$

The correlation of two users' figuration vector is:

If ρ is <dlUePairCoeffTH, when the channel condition of the first two UE meets the requirement that pairing is transmitted; Otherwise, determine the requirement that does not meet pairing transmission when the channel condition of the first two UE, wherein, figuration vector correlation thresholding dlUePairCoeffTH is predefined threshold value, can be determined by link simulation.

After successful matching, further match the distribution of resource, the assigning process of pairing resource specifically comprises:

When each channel condition meets in the Resources list of main UE of matching request, while existing available resources number to be more than or equal to the Resources list of pairing UE resource requirement number, be more than or equal in the Resources list of pairing UE resource requirement number at all available resources numbers, the Resources list of selecting available resources number to deduct the difference minimum of pairing UE resource requirement number is pairing UE Resources allocation;

When each channel condition meets in the Resources list of main UE of matching request, while not existing available resources number to be more than or equal to the Resources list of pairing UE resource requirement number, the Resources list of selecting pairing UE resource requirement number to deduct the difference minimum of available resources number is pairing UE Resources allocation.

Concrete, in the scheduling of current TTI, the resource block number distributing in the resource block number needing according to pairing UE and main UE current TTI judges:

First, being assumed to be UE2 according to pairing UE() candidate PRB the Resources list of meeting pairing condition at each (supposes that i candidate PRB the Resources list is List _pRB(i), its PRB number comprising is N _pairingPRB(i) the average spectral efficiency (ase) eff) _{pDSCH_UE2}(i) and the data volume that will transmit in this subframe domestic demand of pairing UE, determine by the mode of tabling look-up the PRB number N that this UE needs in each candidate PRB the Resources list _{pRB_UE2}(i);

Match the selection of the Resources list, if exist at least one channel condition to meet candidate's the Resources list of pairing transmission requirement, its number of resources meets: N again _pairingPRB(i)>=N _{pRB_UE2}(i), in all candidate's the Resources lists that meet above-mentioned condition, select N _pairingPRB(i)-N _{pRB_UE2}(i) minimum the Resources list q is as the resource of final pairing transmission, and the one or more primary users on the Resources list q are for matching the primary user of transmission simultaneously.

Otherwise, select N _{pRB_UE2}(i)-N _pairingPRB(i) minimum the Resources list q is as the resource of final pairing transmission, and the one or more primary users on the Resources list q are for matching the primary user of transmission simultaneously.

The selection mode of the Resources list is described: suppose that the Resources list L1, L2, L3 have distributed to UE1, UE2, UE3 in this subframe, be thought of as now UE4 and distribute MU-MIMO resource below with concrete example; Suppose that UE4 meets respectively the channel condition pairing criterion in this programme with UE1, UE2, UE3 on the Resources list L1, L2, L3; Suppose that the PRB number that the PRB number that comprises in the list of L1, L2, L3 and UE4 need on each the Resources list is as shown in table 3 simultaneously:

Table 3:UE4 resource is distributed statistical form

For for example institute's column data in 1 in table 3, according to resource distribution principle, demand, L1 and the L2 that L3 can not meet UE4 can meet the demand of UE4, and 5-4<8-6, so should select the Resources list L1 pairing the Resources list as MU-MIMO, UE4 carries out MU-MIMO pairing transmission with UE1 on the Resources list L1.

For for example institute's column data in 2 in table 3, according to resource distribution principle, each the Resources list all can not UE4 demand, and resource quantity in L3 and UE4 requirement differ minimum, so should select the Resources list L3 pairing the Resources list as MU-MIMO, UE4 carries out MU-MIMO transmission with UE3 on the Resources list L3.

The embodiment of the present invention is also corresponding provides a kind of downlink transfer device, as shown in Figure 3, comprising:

Multi-user transmission determining unit 301, activates multi-user's multiple-input and multiple-output MU-MIMO transmission for determining;

Stream transmission determining unit 302, adopts the transmission of single current figuration or the transmission of double-current figuration for determining according to channel situation;

Resource allocation unit 303, is used to user to carry out time-domain resource distribution and frequency domain resource is distributed;

Data transmission unit 304, carries out downlink data transmission for passing through distributed resource.

Wherein, multi-user transmission determining unit 301 specifically for:

Determine and activate MU-MIMO transmission according to the resource-constrained situation of Physical Downlink Shared Channel PDSCH channel resource utilance, physical downlink control channel PDCCH channel resource utilance and PDSCH channel and PDCCH channel.

Concrete, multi-user transmission determining unit 301 specifically for:

Determine that the interior PDSCH channel resource utilance of measurement period is greater than the first threshold of setting, in measurement period, PDCCH channel resource utilance is less than the Second Threshold of setting, and when the difference that the resource-constrained number of times of descending scheduling PDSCH deducts the resource-constrained number of times of descending scheduling PDCCH in the meter cycle in measurement period is greater than the 3rd threshold value, activate the descending MU-MIMO transmission in current area, resource-constrained the referring to because PRB inadequate resource causes part UE of descending scheduling PDSCH can not get the situation of scheduling, the resource-constrained situation that can not get scheduling due to the unsuccessful UE of causing of PDCCH resource distribution that refers to of descending scheduling PDCCH.

Stream transmission determining unit 302 specifically for:

For the UE that adopts non-codebook mode reporting channel quality indication CQI information, the channel information measuring according to detection reference signal SRS is that current UE is determined the figuration transmission of employing single current or the transmission of double-current figuration through Eigenvalues Decomposition;

For adopting codebook mode to report the UE of CQI information, the order information reporting according to UE indication RI is that current UE is determined the figuration transmission of employing single current or the transmission of double-current figuration in conjunction with the feedback information of historical data transmission.

Resource allocation unit 303 specifically for:

Domain scheduling while carrying out according to the data volume of all kinds of downlink business of UE and QoS demand, the priority query of generation UE;

The UE being followed successively by priority query carries out frequency domain dispatching, distributes corresponding frequency domain resource.

The UE that resource allocation unit 303 is followed successively by priority query carries out frequency domain dispatching, distributes corresponding frequency domain resource, specifically comprises:

According to priority query's order, for each UE in priority query, the Resources list that is not yet assigned to any UE in subframe is defined as to alone family and can uses PRB the Resources list, form alone family and can use the set of PRB the Resources list, to distribute in the Resources list of other UE, the Resources list that the number of data layers having used is less than or equal to the predefined number of plies is defined as multi-user and can uses PRB the Resources list, forms multi-user and can use the set of PRB the Resources list;

In the time that PRB the Resources list can be used in the alone family that exists Deta bearer ability to meet current UE transfer of data demand, current UE can be distributed to PRB the Resources list in the alone family that Deta bearer ability is met to current UE transfer of data demand, and definite modulating-coding strategy MCS information;

In the time that PRB the Resources list can be used in the alone family that does not exist Deta bearer ability to meet current UE transfer of data demand:

PRB the Resources list can be used with the alone family of Deta bearer ability maximum in the set of PRB the Resources list in temporary alone family;

Each primary user in current UE and multi-user resource list collection is matched, and match the distribution of resource;

In the time existing Deta bearer ability to meet the Resources list of pairing primary user of current UE transfer of data demand, the Resources list that Deta bearer ability is met to the pairing primary user of current UE transfer of data demand is distributed to current UE, and definite modulating-coding strategy MCS information;

In the time not existing Deta bearer ability to meet the Resources list of pairing primary user of current UE transfer of data demand, relatively with the Resources list of the primary user of current UE pairing in multi-user's list of available resources of Deta bearer ability maximum and temporary alone family can use PRB the Resources list with the alone family of Deta bearer ability maximum in the set of PRB the Resources list, select the large the Resources list of Deta bearer ability to distribute to current UE, and definite modulating-coding strategy MCS information.

Resource allocation unit 303 matches each primary user in current UE and multi-user resource list collection, specifically comprises:

For every two UE that match, the spectrum efficiency of determining two UE is all greater than predefined absolute spectrum efficiency thresholding, and the spectrum efficiency difference of two UE is less than predefined spectrum efficiency difference threshold, and determine when the figuration vector correlation of two UE is less than predefined relevant matches thresholding, determine that working as the first two UE can match, otherwise determine that working as the first two UE can not match.

Resource allocation unit 303 matches the distribution of resource, specifically comprises:

When each channel condition meets in the Resources list of main UE of matching request, while existing available resources number to be more than or equal to the Resources list of pairing UE resource requirement number, be more than or equal in the Resources list of pairing UE resource requirement number at all available resources numbers, the Resources list of selecting available resources number to deduct the difference minimum of pairing UE resource requirement number is pairing UE Resources allocation;

When each channel condition meets in the Resources list of main UE of matching request, while not existing available resources number to be more than or equal to the Resources list of pairing UE resource requirement number, the Resources list of selecting pairing UE resource requirement number to deduct the difference minimum of available resources number is pairing UE Resources allocation.

Data transmission unit 304 carries out downlink data transmission, specifically comprises:

Running time-frequency resource and the corresponding modulating-coding strategy MCS information of distributing definite UE, distributing for UE according to current resource, for UE carries out downlink data transmission.

The embodiment of the present invention provides a kind of downlink transmission method and device, determining after use MU-MIMO transmission means, further determine it is to adopt the transmission of single current figuration or the transmission of double-current figuration according to channel situation, thereby realize and on TM8, support multi-user's single-stream transmission and multi-user's stream transmission, better support various MIMO modes under TM8.

Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware implementation example, completely implement software example or the form in conjunction with the embodiment of software and hardware aspect.And the present invention can adopt the form at one or more upper computer programs of implementing of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.

The present invention is with reference to describing according to flow chart and/or the block diagram of the method for the embodiment of the present invention, equipment (system) and computer program.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, the instruction that makes to carry out by the processor of computer or other programmable data processing device produces the device for realizing the function of specifying at flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame.

These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, the instruction that makes to be stored in this computer-readable memory produces the manufacture that comprises command device, and this command device is realized the function of specifying in flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame.

These computer program instructions also can be loaded in computer or other programmable data processing device, make to carry out sequence of operations step to produce computer implemented processing on computer or other programmable devices, thereby the instruction of carrying out is provided for realizing the step of the function of specifying in flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame on computer or other programmable devices.

Although described the preferred embodiments of the present invention, once those skilled in the art obtain the basic creative concept of cicada, can make other change and modification to these embodiment.So claims are intended to be interpreted as comprising preferred embodiment and fall into all changes and the modification of the scope of the invention.

Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.

Claims (12)

1. a downlink transmission method, is characterized in that, comprising:

Determine and activate multi-user's multiple-input and multiple-output MU-MIMO transmission;

Determine and adopt the transmission of single current figuration or the transmission of double-current figuration according to channel situation;

Domain scheduling while carrying out according to the data volume of all kinds of downlink business of UE and service quality QoS demand, the priority query of generation UE, the UE being followed successively by priority query carries out frequency domain dispatching, distributes corresponding frequency domain resource;

Pass through distributed resource and carry out downlink data transmission;

Wherein, described in the UE that is followed successively by priority query carry out frequency domain dispatching, distribute corresponding frequency domain resource, specifically comprise:

According to priority query's order, for each UE in priority query, the Resources list that is not yet assigned to any UE in subframe is defined as to alone family and can uses PRB the Resources list, form alone family and can use the set of PRB the Resources list, to distribute in the Resources list of other UE, the Resources list that the number of data layers having used is less than or equal to the predefined number of plies is defined as multi-user and can uses PRB the Resources list, forms multi-user and can use the set of PRB the Resources list;

In the time that PRB the Resources list can be used in the alone family that exists Deta bearer ability to meet current UE transfer of data demand, current UE can be distributed to PRB the Resources list in the alone family that Deta bearer ability is met to current UE transfer of data demand, and definite modulating-coding strategy MCS information;

In the time that PRB the Resources list can be used in the alone family that does not exist Deta bearer ability to meet current UE transfer of data demand:

PRB the Resources list can be used with the alone family of Deta bearer ability maximum in the set of PRB the Resources list in temporary alone family;

Each primary user in current UE and multi-user resource list collection is matched, and match the distribution of resource;

In the time existing Deta bearer ability to meet the Resources list of pairing primary user of current UE transfer of data demand, the Resources list that described Deta bearer ability is met to the pairing primary user of current UE transfer of data demand is distributed to current UE, and definite modulating-coding strategy MCS information;

In the time not existing Deta bearer ability to meet the Resources list of pairing primary user of current UE transfer of data demand, relatively with the Resources list of the primary user of current UE pairing in multi-user's list of available resources of Deta bearer ability maximum and temporary alone family can use PRB the Resources list with the alone family of Deta bearer ability maximum in the set of PRB the Resources list, select the large the Resources list of Deta bearer ability to distribute to current UE, and definite modulating-coding strategy MCS information.

2. the method for claim 1, is characterized in that, described definite activation MU-MIMO transmission, specifically comprises:

Determine and activate MU-MIMO transmission according to the resource-constrained situation of Physical Downlink Shared Channel PDSCH channel resource utilance, physical downlink control channel PDCCH channel resource utilance and PDSCH channel and PDCCH channel.

3. method as claimed in claim 2, is characterized in that, described definite activation MU-MIMO transmission, specifically comprises:

Determine that the interior Physical Downlink Shared Channel PDSCH channel resource utilance of measurement period is greater than the first threshold of setting, in measurement period, physical downlink control channel PDCCH channel resource utilance is less than the Second Threshold of setting, and when the difference that the resource-constrained number of times of descending scheduling PDSCH deducts the resource-constrained number of times of descending scheduling PDCCH in the meter cycle in measurement period is greater than the 3rd threshold value, activate the descending MU-MIMO transmission in current area, resource-constrained the referring to because Physical Resource Block PRB inadequate resource causes part UE of described descending scheduling PDSCH can not get the situation of scheduling, the resource-constrained situation that can not get scheduling due to the unsuccessful UE of causing of PDCCH resource distribution that refers to of described descending scheduling PDCCH.

4. the method for claim 1, is characterized in that, described according to the figuration transmission of the definite employing of channel situation single current or the transmission of double-current figuration, specifically comprises:

For the UE that adopts non-codebook mode reporting channel quality indication CQI information, the channel information measuring according to detection reference signal SRS is that current UE is determined the figuration transmission of employing single current or the transmission of double-current figuration through Eigenvalues Decomposition;

For adopting codebook mode to report the UE of CQI information, the order information reporting according to UE indication RI is that current UE is determined the figuration transmission of employing single current or the transmission of double-current figuration in conjunction with the feedback information of historical data transmission.

5. the method for claim 1, is characterized in that, described each primary user in current UE and multi-user resource list collection is matched, and specifically comprises:

For every two UE that match, the spectrum efficiency of determining two UE is all greater than predefined absolute spectrum efficiency thresholding, and the spectrum efficiency difference of two UE is less than predefined spectrum efficiency difference threshold, and determine when the figuration vector correlation of two UE is less than predefined relevant matches thresholding, determine that working as the first two UE can match, otherwise determine that working as the first two UE can not match.

6. the method for claim 1, is characterized in that, described in match the distribution of resource, specifically comprise:

When each channel condition meets in the Resources list of main UE of matching request, while existing available resources number to be more than or equal to the Resources list of pairing UE resource requirement number, be more than or equal in the Resources list of pairing UE resource requirement number at all available resources numbers, the Resources list of selecting available resources number to deduct the difference minimum of pairing UE resource requirement number is described pairing UE Resources allocation;

When each channel condition meets in the Resources list of main UE of matching request, while not existing available resources number to be more than or equal to the Resources list of pairing UE resource requirement number, the Resources list of selecting pairing UE resource requirement number to deduct the difference minimum of available resources number is described pairing UE Resources allocation.

7. a downlink transfer device, is characterized in that, comprising:

Multi-user transmission determining unit, activates multi-user's multiple-input and multiple-output MU-MIMO transmission for determining;

Stream transmission determining unit, adopts the transmission of single current figuration or the transmission of double-current figuration for determining according to channel situation;

Resource allocation unit, domain scheduling when carrying out according to the data volume of all kinds of downlink business of UE and service quality QoS demand, generates the priority query of UE, and the UE being followed successively by priority query carries out frequency domain dispatching, distributes corresponding frequency domain resource;

Data transmission unit, carries out downlink data transmission for passing through distributed resource;

Wherein, described resource allocation unit specifically for:

According to priority query's order, for each UE in priority query, the Resources list that is not yet assigned to any UE in subframe is defined as to alone family and can uses PRB the Resources list, form alone family and can use the set of PRB the Resources list, to distribute in the Resources list of other UE, the Resources list that the number of data layers having used is less than or equal to the predefined number of plies is defined as multi-user and can uses PRB the Resources list, forms multi-user and can use the set of PRB the Resources list;

In the time that PRB the Resources list can be used in the alone family that exists Deta bearer ability to meet current UE transfer of data demand, current UE can be distributed to PRB the Resources list in the alone family that Deta bearer ability is met to current UE transfer of data demand, and definite modulating-coding strategy MCS information;

In the time that PRB the Resources list can be used in the alone family that does not exist Deta bearer ability to meet current UE transfer of data demand:

PRB the Resources list can be used with the alone family of Deta bearer ability maximum in the set of PRB the Resources list in temporary alone family;

Each primary user in current UE and multi-user resource list collection is matched, and match the distribution of resource;

In the time existing Deta bearer ability to meet the Resources list of pairing primary user of current UE transfer of data demand, the Resources list that described Deta bearer ability is met to the pairing primary user of current UE transfer of data demand is distributed to current UE, and definite modulating-coding strategy MCS information;

In the time not existing Deta bearer ability to meet the Resources list of pairing primary user of current UE transfer of data demand, relatively with the Resources list of the primary user of current UE pairing in multi-user's list of available resources of Deta bearer ability maximum and temporary alone family can use PRB the Resources list with the alone family of Deta bearer ability maximum in the set of PRB the Resources list, select the large the Resources list of Deta bearer ability to distribute to current UE, and definite modulating-coding strategy MCS information.

8. device as claimed in claim 7, is characterized in that, described multi-user transmission determining unit specifically for:

Determine and activate MU-MIMO transmission according to the resource-constrained situation of Physical Downlink Shared Channel PDSCH channel resource utilance, physical downlink control channel PDCCH channel resource utilance and PDSCH channel and PDCCH channel.

9. device as claimed in claim 8, is characterized in that, described multi-user transmission determining unit specifically for:

Determine that the interior PDSCH channel resource utilance of measurement period is greater than the first threshold of setting, in measurement period, PDCCH channel resource utilance is less than the Second Threshold of setting, and when the difference that the resource-constrained number of times of descending scheduling PDSCH deducts the resource-constrained number of times of descending scheduling PDCCH in the meter cycle in measurement period is greater than the 3rd threshold value, activate the descending MU-MIMO transmission in current area, resource-constrained the referring to because PRB inadequate resource causes part UE of described descending scheduling PDSCH can not get the situation of scheduling, the resource-constrained situation that can not get scheduling due to the unsuccessful UE of causing of PDCCH resource distribution that refers to of described descending scheduling PDCCH.

10. device as claimed in claim 7, is characterized in that, described stream transmission determining unit, specifically for:

For the UE that adopts non-codebook mode reporting channel quality indication CQI information, the channel information measuring according to detection reference signal SRS is that current UE is determined the figuration transmission of employing single current or the transmission of double-current figuration through Eigenvalues Decomposition;

For adopting codebook mode to report the UE of CQI information, the order information reporting according to UE indication RI is that current UE is determined the figuration transmission of employing single current or the transmission of double-current figuration in conjunction with the feedback information of historical data transmission.

11. devices as claimed in claim 7, is characterized in that, described resource allocation unit matches each primary user in current UE and multi-user resource list collection, specifically comprises:

For every two UE that match, the spectrum efficiency of determining two UE is all greater than predefined absolute spectrum efficiency thresholding, and the spectrum efficiency difference of two UE is less than predefined spectrum efficiency difference threshold, and determine when the figuration vector correlation of two UE is less than predefined relevant matches thresholding, determine that working as the first two UE can match, otherwise determine that working as the first two UE can not match.

12. devices as claimed in claim 7, is characterized in that, described resource allocation unit matches the distribution of resource, specifically comprises:

When each channel condition meets in the Resources list of main UE of matching request, while existing available resources number to be more than or equal to the Resources list of pairing UE resource requirement number, be more than or equal in the Resources list of pairing UE resource requirement number at all available resources numbers, the Resources list of selecting available resources number to deduct the difference minimum of pairing UE resource requirement number is described pairing UE Resources allocation;

When each channel condition meets in the Resources list of main UE of matching request, while not existing available resources number to be more than or equal to the Resources list of pairing UE resource requirement number, the Resources list of selecting pairing UE resource requirement number to deduct the difference minimum of available resources number is described pairing UE Resources allocation.

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