CN102595385A - Downlink transmission method and device - Google Patents
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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
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) introduced in the standard of LTE (Long Term Evolution, Long Term Evolution) system R9 version transmission mode 8 (Transport Mode 8, TM8).
In down link; When base station configuration when a plurality of 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 simultaneously a plurality of UE (user ' s equipment; Subscriber equipment), improve the band efficiency of system, the number of users that system supports through the mode of space division multiplexing.
Introduced double-current figuration technology among the LTE R9, i.e. TM8 based on the dual-port dedicated pilot.According to standard code; TM8 adopts antenna port Port 7, Port 8 to transmit; The DRS (Dedicated Reference Signal) of these two ports occupies identical running time-frequency resource position, but takes different quadrature mask code sequences to distinguish, and passes through descending scheduling signaling DCI format 2B (the downlink control information format 2B of TM8; Descending control information format 2B) the parameter scrambler ID in (Identifier, sign) carries out the initialization of scrambler.On this basis; The base station can be dispatched the UE of two single-stream transmission respectively at mutually orthogonal UE-specific RS (UE-specific reference signal; The user-specific reference signal) constitutes MU-MIMO (Multi-user MIMO, multiuser MIMO) on the port.And the scrambler initialization ID through indicating in the descending control signaling, at most can be with 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 typical MIMO transmission means is 4 types shown in Fig. 1 a-Fig. 1 d, and Fig. 1 a is SU-MIMO, comprises single port 7/8 and double-deck transmission; Fig. 1 b is MU-MIMO, dispatches 2 UE simultaneously, and each UE individual layer transmission; Fig. 1 c is MU-MIMO, dispatches 2 UE simultaneously, the double-deck transmission of each UE; Fig. 1 d is MU-MIMO, dispatches 4 UE simultaneously, each UE individual layer transmission.
Table 1:TM8 application scenarios is described
By contrast; The LTE system is in the transmission mode of R8 kind definition; Only support single user's single codeword transmission (like TM1, TM2, TM6, TM7) or only support multi-user's single codeword transmission (like TM5), or only support the many codeword transmission of single user (like TM3, TM4).Because TM8 can realize the transmission of single user's single codeword, the many code words of single user, multi-user's single codeword, the many code words of multi-user simultaneously, so TM8 has higher requirement for the descending scheduling Algorithm design.
In present disclosed LTE system call algorithm; Its basic ideas comprise following two steps; That is: at first according to data volume and QoS (Quality of Service, service quality) domain scheduling when demand is carried out of all kinds of downlink business of UE, generate the priority query of UE; The UE that is followed successively by then in the priority query carries out frequency domain dispatching, distributes corresponding frequency domain resource.
When Resources allocation, information such as the downlink transfer pattern of consideration UE, channel quality, the UE schedule of apportionment code source of confirming as current scheduling still is many code sources, considers whether to use the resource of multiuser multiplexing simultaneously for the UE that supports MU-MIMO.The present descending scheduling algorithm of LTE system can satisfy the demand of the comparatively single downlink transfer pattern of function basically, but awaits 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 single user/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; Present descending scheduling algorithm only can be supported part MIMO mode on the TM8 flow process; Like single user's single current (single codeword), single user 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 invention provides a kind of downlink transmission method and device, with various MIMO modes under the better support TM8.
A kind of downlink transmission method comprises:
Confirm to activate multi-user's multiple-input and multiple-output MU-MIMO transmission;
Confirm to adopt transmission of single current figuration or the transmission of double-current figuration according to channel situation;
Time-domain resource is distributed and frequency domain resource is distributed for the user carries out;
The resource of passing through to be distributed is carried out downlink data transmission.
A kind of downlink transfer device comprises:
The multi-user is transmitted definite unit, is used for confirming to activate multi-user's multiple-input and multiple-output MU-MIMO transmission;
Stream transmission is confirmed the unit, is used for confirming to adopt transmission of single current figuration or the transmission of double-current figuration according to channel situation;
Resource allocation unit is used to the user and carries out time-domain resource distribution and frequency domain resource distribution;
Data transmission unit, the resource that is used for passing through to be distributed is carried out downlink data transmission.
The embodiment of the invention provides a kind of downlink transmission method and device; After confirming to use the MU-MIMO transmission means; Further confirming to adopt the transmission of single current figuration according to channel situation still is double-current figuration transmission; Thereby be implemented in TM8 and go up support multi-user's single-stream transmission and multi-user's stream transmission, better support various MIMO modes under the TM8.
Description of drawings
Fig. 1 a-Fig. 1 d is the MIMO mode sketch map that transmission mode 8 is supported in the prior art;
The downlink transmission method flow chart that Fig. 2 provides for the embodiment of the invention;
The downlink transfer apparatus structure sketch map that Fig. 3 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of downlink transmission method and device; After confirming to use the MU-MIMO transmission means; Further confirming to adopt the transmission of single current figuration according to channel situation still is double-current figuration transmission; Thereby be implemented in TM8 and go up support multi-user's single-stream transmission and multi-user's stream transmission, better support various MIMO modes under the TM8.
As shown in Figure 2, comprise in the downlink transmission method that the embodiment of the invention provides:
Step S201, definite MU-MIMO of activation transmit;
Step S202, confirm to adopt transmission of single current figuration or the transmission of double-current figuration according to channel situation;
Step S203, time-domain resource is distributed and frequency domain resource is distributed for the user carries out;
Step S204, the resource of passing through to be distributed are carried out downlink data transmission.
Because after confirming to activate the MU-MIMO mode, transmission of single current figuration or the transmission of double-current figuration when further confirming transmission means according to channel situation are so provide more comprehensive support for various MIMO modes under the TM8.
Wherein, In step S201; Confirm to activate the MU-MIMO transmission; Can confirm to activate the 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:
Confirm PDSCH (physical downlink control channel in the measurement period; Physical Downlink Shared Channel) the channel resource utilance is greater than PDCCH (Physical Downlink Shared Channel in the first threshold of setting, the measurement period; Physical Downlink Control Channel) the channel resource utilance is less than second threshold value of setting; And 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 the measurement period is during greater than the 3rd threshold value; Activate the descending MU-MIMO transmission of current area; Descending scheduling PDSCH is resource-constrained to be meant because PRB (physical Resource Block; Physical Resource Block) inadequate resource causes the situation that part UE can not get dispatching, and descending scheduling PDCCH is resource-constrained to be meant because the unsuccessful situation that causes UE to can not get dispatching of PDCCH resource allocation.
Concrete, can set statistics duration T earlier
Dl_Mu_Stat, and the periodic statistics of beginning and judging after setting the statistics duration, when carrying out the MU-MIMO transmission and activating, can be used predefined statistics duration follow-up, no longer resets;
In statistic period T
Dl_Mu_StatIn, PRB (Physical Resource Block, Physical Resource Block) the resource operating position of each descending sub frame of statistics current area PDSCH channel is confirmed statistic period T simultaneously
Dl_Mu_StatThe resource-constrained times N of interior descending scheduling PDSCH
PDSCH_run_outWith the resource-constrained times N of uplink and downlink dynamic dispatching PDCCH in the measurement period
PDCCH_run_out
As measurement period arrival, the PDSCH channel resource utilance η in the counting statistics cycle
PRB_PDSCHResource utilization η with the PDCCH channel
CCE_PDCCH, carry out descending MU-MIMO then 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, then activate descending MU-MIMO transmission, the measurement of indicating physical layer to be correlated with simultaneously for current area;
Otherwise current area does not adopt descending MU-MIMO transmission.
Wherein:
PDSCH is resource-constrained to be meant in the descending scheduling process, because PDSCH does not have the PRB resource and can distribute the situation that causes part UE to can not get dispatching;
PDCCH is resource-constrained to be meant in the uplink and downlink scheduling process, because the unsuccessful situation that causes UE to can not get dispatching of PDCCH resource allocation;
PDSCH channel resource utilance η
PRB_PDSCHBe defined as: cycle T
Dl_Mu_StatThe PRB number of the actual use of interior PDSCH channel and the ratio of this section available resources sum in the time;
PDCCH channel resource utilance η
CCE_PDCCHBe defined as: cycle T
Dl_Mu_StatThe ratio of the CCE of the actual use of interior PDCCH channel (Control Channel Element, control channel unit) number and this section available CCE resource sum in the time;
Parameter TH
DlMuMIMO_PDSCH, TH
DlMuMIMO_PDCCHAnd TH
Run_outBe 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 and/or the base station of terminal to report carries out the double-current adaptive judgement of list; UE for TM8; The CQI information reporting at terminal has two kinds of optional modes: based on reporting of code book and reporting of non-code book, at this moment, step S202 specifically comprises:
For adopting non-codebook mode to report CQI (Channel Quality Indicator; The channel quality indication) UE of information; The channel information that measures according to SRS (Sounding Reference Signal, detection reference signal) is that current UE confirms to adopt transmission of single current figuration or the transmission of double-current figuration through characteristic value decomposition;
For adopting codebook mode to report the UE of CQI information, it is that current UE confirms to adopt transmission of single current figuration or the transmission of double-current figuration that the RI (Rank Indicator, the indication of order information) that reports according to UE combines 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 invention no longer is described in detail.
In step S203, time-domain resource is distributed and frequency domain resource is distributed for the user carries out, and specifically comprises:
Domain scheduling when carrying out according to the data volume of all kinds of downlink business of UE and QoS demand generates the priority query of UE;
The UE that is followed successively by in the priority query carries out frequency domain dispatching, distributes corresponding frequency domain resource.
Concrete, the UE in being followed successively by priority query carries out frequency domain dispatching, when distributing corresponding frequency domain resource; Can judge earlier that current the excuting a law in sub-district activate the MU-MIMO function; When not activating the MU-MIMO function, then selecting current according to factors such as channel conditions is to adopt transmission of single current figuration or the transmission of double-current figuration, if activated MU-MIMO; Then, carry out transfer of data according to following scheme to being configured to the UE of TM8 in the system:
According to priority query's order; For each UE in priority query; Will be in subframe unallocated the Resources list of giving any UE is confirmed as single user and can be used PRB the Resources list, forms single user and can use the set of PRB the Resources list, in the Resources list of distributing to other UE; The Resources list that already used number of data layers is less than or equal to the predefined number of plies is confirmed as the multi-user and can be used PRB the Resources list, forms the multi-user and can use the set of PRB the Resources list;
When the single user who exists the Data-carrying ability to satisfy current UE transfer of data demand can use PRB the Resources list; The single user who then the Data-carrying ability is satisfied current UE transfer of data demand can distribute to current UE with PRB the Resources list, and definite modulating-coding strategy MCS information;
Otherwise, when the single user who does not exist the Data-carrying ability to satisfy current UE transfer of data demand can use PRB the Resources list:
Temporary single user can use single user of Data-carrying ability maximum in the set of PRB the Resources list can use PRB the Resources list;
Each main user in the set of current UE and multi-user's the Resources list is matched, and match the distribution of resource;
When existing the Data-carrying ability to satisfy the Resources list of the main user of pairing of current UE transfer of data demand; The Data-carrying ability is satisfied the Resources list of the main user of pairing of current UE transfer of data demand and distribute to current UE, and definite modulating-coding strategy MCS information;
When not existing the Data-carrying ability to satisfy the Resources list of the main user of pairing of current UE transfer of data demand; Relatively with the Resources list of the main user of current UE pairing in the maximum multi-user's list of available resources of Data-carrying ability and temporary single user can use that the maximum single user of Data-carrying ability can use PRB the Resources list in the set of PRB the Resources list; Select the big the Resources list of Data-carrying ability to distribute to current UE, and definite modulating-coding strategy MCS information.
Concrete, when being each the UE Resources allocation in the priority query, at first need confirm the set of candidate PRB the Resources list:
For in the unallocated PRB resource of giving any UE of this subframe; Put it into resource collection S1; For the resource among the S1, sort from high to low according to the CQI on each PRB, and according to DCI (the Downlink control information of current UE; Downlink Control Information) the resource allocation type of form support is judged the availability of resource; Available resource is generated the set of candidate PRB the Resources list, and the Resources list of correspondence is designated single user's list of available resources, corresponding the Resources list set identification is single user's list of available resources set.
For the PRB resource of distributing to the UE under other TM8 pattern; If its already used number of data layers is smaller or equal to the MaxAllowedLayer (parameter that is provided with in advance; Be used to control maximum operable number of data layers under the 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 main user's resource allocation result and (suppose that i candidate PRB the Resources list is List
PRB(i), its PRB number that comprises is N
PairingPRB(i)), and these the Resources lists are designated multi-user's list of available resources, corresponding the Resources list set identification is gathered for multi-user's list of available resources.
Wherein, the resource allocation type of various DCI forms supports is as shown in table 2:
Table 2: the resource allocation type that various DCI forms are supported
| The DCI form | The resource allocation type |
| DCI?format?1/2/2A/2B | Type?0、Type?1 |
| DCI?format?1A/1B/1C/1D | Type?2 |
Wherein, the DCI form of TM8 support comprises: DCI format 1A, DCI format 2B.Under the various resource allocation types, the availability basis for estimation of resource is following:
For Type 0, have only interior all PRB of RBG under PRB (resource block group, Resource Block group) all can use, this PRB is just available;
For Type 1, selected PRB must be positioned at same addressing space;
For Type 2, selected PRB must satisfy the continuous requirement of VRB (Virtual Resource Block, virtual resource blocks).
The judgement of the availability of resource is well known to those skilled in the art under the various resource allocation types, no longer is described in detail here.
When being the current UE Resources allocation,, then in single user's list of available resources set, selecting resource to carry out resource allocation successively, and calculate the Data-carrying ability of institute's Resources allocation if the set of single user's list of available resources is not empty; If the Data-carrying ability of institute's Resources allocation can satisfy current transfer of data demand of waiting to dispatch UE; The resource that resource in single user resources tabulation of then selecting to be distributed is used in this downlink data transmission process as this UE; Confirm MCS (Modulation Code Scheme simultaneously; The modulating-coding strategy) information such as, and confirm that this resource allocation finishes;
If the Data-carrying ability of institute's Resources allocation can not satisfy current transfer of data demand of waiting to dispatch UE, then temporary current single user resources allocation result, and proceed multi-user's resource allocation.
During multi-user's resource allocation; If the set of multi-user's list of available resources is not empty; Then 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, accomplish the selection of pairing the Resources list.
If have a plurality of main UE on some the Resources lists, when carrying out UE pairing decision-making, need to guarantee that pairing UE and any main UE satisfy the condition of MU-MIMO pairing transmission; Return the unsuccessful sign of pairing when on this Resources list, calling UE pairing decision-making module between pairing UE and any main UE if having, then current UE is matched failure on this Resources list, and current UE can not be used the resource in this multi-user the Resources list.
If multi-user's resource allocation result is not empty; The Data-carrying ability of multi-user's resource of dispensed then: if the Data-carrying ability of institute's Resources allocation can satisfy current transfer of data demand of waiting to dispatch UE; The resource that resource in multi-user's the Resources list of then selecting to be distributed is used in this downlink data transmission process as this UE; Confirm information such as MCS simultaneously, confirm that this resource allocation finishes;
If the Data-carrying ability of multi-user's resource can not satisfy the transfer of data demand of UE; Then obtain temporary single user resources allocation result; And compare with multi-user's resource allocation result; And select the final resource allocation result of a bigger conduct of Data-carrying ability to confirm information such as MCS simultaneously, confirm that this resource allocation finishes.
UE according to the thinking TM8 of above-mentioned resource allocation can realize the resource allocation of list/multiuser MIMO flexibly, and can realize the various MIMO transmission meanss in the table 1 flexibly.
At present, carrying out the multi-user when matching, and underusing the spatial character of channel, for the wave beam forming of TM8, there is the space of further optimizing in the algorithm that promptly matches.Present multi-user's pairing transmission only takes in frequency domain dispatching, and 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 satisfy the ability that MU-MIMO transmits, and suppose that UE1 is the main user who has distributed resource, but UE1 needs data quantity transmitted very big according to the situation UE1 and the UE2 of wireless channel; The number of resources that needs is a lot, and the number of resources that UE2 needs seldom, when then pairing is transmitted; Consider the performance of data demodulates; Require UE1 to use identical resource with UE2 at present, therefore, this pairing transmission can not make full use of the Radio Resource of system.
The embodiment of the invention is also corresponding to provide a kind of matching method; For per two UE that match; The spectrum efficiency of confirming 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 the figuration vector correlation property of confirming two UE is during less than predefined relevant matches thresholding; Confirm that current two UE can match, otherwise confirm that current two UE can not match.
Concrete, confirm that according to user's channel information etc. can a plurality of users use identical PRB resource to carry out transfer of data.In addition, in the pairing algorithm, can also carry out the pairing of service layer according to characteristics such as types of service.
In resource allocation process, each UE carries out resource allocation successively according to priority orders, in resource allocation process, if need to use the resource of MU-MIMO, then on corresponding resource blocks, matches trial.That is, carry out the resource of each transport layer of MU transmission on the identical physical resources and distribute in order, and be not to distribute simultaneously.In the mode of this resource allocation; Carry out existing between the UE of MU-MIMO transmission main, branch takes second place; Wherein, confirmed that in a TTI (Transmission Timing Interval, Transmission Time Interval) UE that takies this resource is called as main UE (in a TTI; Possibly have a plurality of main UE simultaneously on the same asset), the UE that MU-MIMO pairing transmission is carried out in trial is called as pairing UE.
When matching, at first consider channel information, comprise channel quality information, channel condition information.(number of supposing to comprise in the Resources list PRB is N according to candidate PRB the Resources list i of frequency domain dispatching module output
PairingPRB(i); This number is the resource block number that main this subframe of UE is distributed); Search the CQI information of each PRB of the two UE storage of current trial pairing, this CQI information is to take all factors into consideration up-to-date CQI to report and revise with CQI and the later spectrum efficiency information of CQI reconstruction result.
For each UE (be assumed to be main UE, the pairing UE be assigned as UE1 and UE2), carry out match based on the spectrum efficiency information of UE on above-mentioned resource respectively, obtain the average spectral efficiency (ase) eff on the selected resource
PDSCH_UE1(i), eff
PDSCH_UE2(i):
Carry out the match judgement of spectrum efficiency later on: if | eff
PDSCH_UE1(i)-eff
PDSCH_UE2(i) |≤dlUePairEffDiffTH, eff
PDSCH_UE1(i)＞dlPairEffTH, and eff
PDSCH_UE2(i)＞and dlUePairEffTH, then can further mate; Otherwise confirm that current two UE do not satisfy matching request, wherein spectrum efficiency difference threshold dlUePairEffDiffTH, absolute spectrum efficiency thresholding dlUePairEffTH are predefined threshold value, can confirm through link simulation;
If pairing UE then obtains the AoA (Angle of Arrival, the angle of arrival) that obtains after two UE estimate SRS through the judgement of spectrum efficiency after the match, calculate correlation: the AoA that supposes user 1 is θ
1, user 2 AoA is θ
2, N
tBe number of transmit antennas, d is an antenna distance, calculates the figuration vector of UE n:
Then the correlation of two users' figuration vector is:
If ρ＜dlUePairCoeffTH, the channel condition of current two UE satisfies the requirement of pairing transmission; Otherwise, confirm that the channel condition of current two UE does not satisfy the requirement of pairing transmission, wherein, figuration vector correlation property thresholding dlUePairCoeffTH is predefined threshold value, can be confirmed by link simulation.
After successful matching, then further match the distribution of resource, the assigning process of pairing resource specifically comprises:
When each channel condition satisfies in the Resources list of main UE of matching request; When having the available resources number more than or equal to the Resources list of pairing UE resource requirement number; In all available resources numbers the Resources list more than or equal to pairing UE resource requirement number, minimum the Resources list of difference of selecting the available resources number to deduct pairing UE resource requirement number is pairing UE Resources allocation;
When each channel condition satisfies in the Resources list of main UE of matching request; When not having the available resources number more than or equal to the Resources list of pairing UE resource requirement number, minimum the Resources list of difference of selecting pairing UE resource requirement number to deduct the available resources number is pairing UE Resources allocation.
Concrete, in the scheduling of current TTI, judge according to the resource block number that distributes in the resource block number of pairing UE needs and the main UE current TTI:
At first, (suppose that i candidate PRB the Resources list is List according to pairing UE (being assumed to be UE2) at candidate PRB the Resources list that each meets the pairing condition
PRB(i), its PRB number that comprises is N
PairingPRB(i)) the average spectral efficiency (ase) eff in
PDSCH_UE2(i) and pairing UE want data quantity transmitted in this subframe domestic demand, confirm the PRB number N that this UE needs through the mode of tabling look-up in each candidate PRB the Resources list
PRB_UE2(i);
The selection of matching the Resources list again, if exist at least one channel condition to satisfy candidate's the Resources list of pairing transmission requirement, its number of resources satisfies: N
PairingPRB(i)>=N
PRB_UE2(i), then, all select N in satisfying candidate's the Resources list of above-mentioned condition
PairingPRB(i)-N
PRB_UE2(i) minimum the Resources list q is as finally matching the resource of transmitting, and the one or more main user on the Resources list q is for matching the main user of transmitting simultaneously.
Otherwise, select N
PRB_UE2(i)-N
PairingPRB(i) minimum the Resources list q is as finally matching the resource of transmitting, and the one or more main user on the Resources list q is for matching the main user of transmitting simultaneously.
The selection mode of the Resources list is described below: suppose that the Resources list L1, L2, L3 have distributed to UE1, UE2, UE3 in this subframe, be thought of as UE4 now and distribute the MU-MIMO resource with concrete instance; Suppose UE4 at the Resources list L1, L2, L3 is last and UE1, UE2, UE3 satisfy the channel condition pairing criterion in this programme respectively; Suppose that simultaneously the PRB number and the UE4 PRB number of needs on each the Resources list that comprise in the tabulation of L1, L2, L3 are as shown in table 3:
Table 3:UE4 resource allocation statistical form
For the for example listed data in 1 in the table 3; According to the resource allocation principle; Demand, L1 and the L2 that L3 can not satisfy UE4 can satisfy the demand of UE4; And 5-4＜8-6, so should select the Resources list L1 pairing the Resources list as MU-MIMO, promptly UE4 carries out MU-MIMO pairing transmission with UE1 on the Resources list L1.
For the for example listed data in 2 in the table 3; According to the resource allocation principle; Each the Resources list all can not UE4 demand; And resource quantity among the L3 and UE4 requirement differ minimum, so should select the Resources list L3 pairing the Resources list as MU-MIMO, promptly UE4 carries out the MU-MIMO transmission with UE3 on the Resources list L3.
The embodiment of the invention is also corresponding to provide a kind of downlink transfer device, as shown in Figure 3, comprising:
The multi-user is transmitted and is confirmed unit 301, is used for confirming to activate multi-user's multiple-input and multiple-output MU-MIMO transmission;
Stream transmission is confirmed unit 302, is used for confirming to adopt transmission of single current figuration or the transmission of double-current figuration according to channel situation;
Wherein, the multi-user is transmitted and is confirmed that unit 301 specifically is used for:
Confirm to activate the 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, the multi-user is transmitted and is confirmed that unit 301 specifically is used for:
Confirm in the measurement period PDSCH channel resource utilance greater than PDCCH channel resource utilance in the first threshold of setting, the measurement period less than second threshold value of setting; And 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 the measurement period is during greater than the 3rd threshold value; Activate the descending MU-MIMO transmission of current area; The resource-constrained situation that causes part UE to can not get dispatching owing to the PRB inadequate resource that is meant of descending scheduling PDSCH, descending scheduling PDCCH is resource-constrained to be meant because the unsuccessful situation that causes UE to can not get dispatching of PDCCH resource allocation.
Stream transmission confirms that unit 302 specifically is used for:
For the UE that adopts non-codebook mode reporting channel quality indicator (CQI) information, the channel information that measures according to detection reference signal SRS is that current UE confirms to adopt transmission of single current figuration or the transmission of double-current figuration through characteristic value decomposition;
For adopting codebook mode to report the UE of CQI information, it is that current UE confirms to adopt transmission of single current figuration or the transmission of double-current figuration that the order information indication RI that reports according to UE combines the feedback information of historical data transmission.
Domain scheduling when carrying out according to the data volume of all kinds of downlink business of UE and QoS demand generates the priority query of UE;
The UE that is followed successively by in the priority query carries out frequency domain dispatching, distributes corresponding frequency domain resource.
The UE that resource allocation unit 303 is followed successively by in the 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; Will be in subframe unallocated the Resources list of giving any UE is confirmed as single user and can be used PRB the Resources list, forms single user and can use the set of PRB the Resources list, in the Resources list of distributing to other UE; The Resources list that already used number of data layers is less than or equal to the predefined number of plies is confirmed as the multi-user and can be used PRB the Resources list, forms the multi-user and can use the set of PRB the Resources list;
When the single user who exists the Data-carrying ability to satisfy current UE transfer of data demand can use PRB the Resources list; The single user who then the Data-carrying ability is satisfied current UE transfer of data demand can distribute to current UE with PRB the Resources list, and definite modulating-coding strategy MCS information;
When the single user who does not exist the Data-carrying ability to satisfy current UE transfer of data demand can use PRB the Resources list:
Temporary single user can use single user of Data-carrying ability maximum in the set of PRB the Resources list can use PRB the Resources list;
Each main user in the set of current UE and multi-user's the Resources list is matched, and match the distribution of resource;
When existing the Data-carrying ability to satisfy the Resources list of the main user of pairing of current UE transfer of data demand; The Data-carrying ability is satisfied the Resources list of the main user of pairing of current UE transfer of data demand and distribute to current UE, and definite modulating-coding strategy MCS information;
When not existing the Data-carrying ability to satisfy the Resources list of the main user of pairing of current UE transfer of data demand; Relatively with the Resources list of the main user of current UE pairing in the maximum multi-user's list of available resources of Data-carrying ability and temporary single user can use that the maximum single user of Data-carrying ability can use PRB the Resources list in the set of PRB the Resources list; Select the big the Resources list of Data-carrying ability to distribute to current UE, and definite modulating-coding strategy MCS information.
For per two UE that match; The spectrum efficiency of confirming 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 the figuration vector correlation property of confirming two UE is confirmed that current two UE can match, otherwise is confirmed that current two UE can not match during less than predefined relevant matches thresholding.
When each channel condition satisfies in the Resources list of main UE of matching request; When having the available resources number more than or equal to the Resources list of pairing UE resource requirement number; In all available resources numbers the Resources list more than or equal to pairing UE resource requirement number, minimum the Resources list of difference of selecting the available resources number to deduct pairing UE resource requirement number is pairing UE Resources allocation;
When each channel condition satisfies in the Resources list of main UE of matching request; When not having the available resources number more than or equal to the Resources list of pairing UE resource requirement number, minimum the Resources list of difference of selecting pairing UE resource requirement number to deduct the available resources number is pairing UE Resources allocation.
The UE that confirms according to current resource allocation, be the running time-frequency resource and the corresponding modulation coding strategy MCS information of UE distribution, for UE carries out downlink data transmission.
The embodiment of the invention provides a kind of downlink transmission method and device; After confirming to use the MU-MIMO transmission means; Further confirming to adopt the transmission of single current figuration according to channel situation still is double-current figuration transmission; Thereby be implemented in TM8 and go up support multi-user's single-stream transmission and multi-user's stream transmission, better support various MIMO modes under the TM8.
Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of the embodiment of complete hardware embodiment, complete software implementation example or combination software and hardware aspect.And the present invention can be employed in the form that one or more computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code go up the computer program of implementing.
The present invention is that reference is described according to the flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the 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, make the instruction of carrying out through the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in ability vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work; Make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device; Make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby the instruction of on computer or other programmable devices, carrying out is provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic inventive concept could of cicada, then can make other change and modification to these embodiment.So accompanying claims is intended to be interpreted as all changes and the modification that comprises preferred embodiment and fall into the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (16)
1. a downlink transmission method is characterized in that, comprising:
Confirm to activate multi-user's multiple-input and multiple-output MU-MIMO transmission;
Confirm to adopt transmission of single current figuration or the transmission of double-current figuration according to channel situation;
Time-domain resource is distributed and frequency domain resource is distributed for the user carries out;
The resource of passing through to be distributed is carried out downlink data transmission.
2. the method for claim 1 is characterized in that, said definite activation MU-MIMO transmission specifically comprises:
Confirm to activate the 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, said definite activation MU-MIMO transmission specifically comprises:
Confirm in the measurement period Physical Downlink Shared Channel PDSCH channel resource utilance greater than physical downlink control channel PDCCH channel resource utilance in the first threshold of setting, the measurement period less than second threshold value of setting; And 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 the measurement period is during greater than the 3rd threshold value; Activate the descending MU-MIMO transmission of current area; The resource-constrained situation that causes part UE to can not get dispatching owing to Physical Resource Block PRB inadequate resource that is meant of said descending scheduling PDSCH, said descending scheduling PDCCH is resource-constrained to be meant because the unsuccessful situation that causes UE to can not get dispatching of PDCCH resource allocation.
4. the method for claim 1 is characterized in that, and is said according to 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 indicator (CQI) information, the channel information that measures according to detection reference signal SRS is that current UE confirms to adopt transmission of single current figuration or the transmission of double-current figuration through characteristic value decomposition;
For adopting codebook mode to report the UE of CQI information, it is that current UE confirms to adopt transmission of single current figuration or the transmission of double-current figuration that the order information indication RI that reports according to UE combines the feedback information of historical data transmission.
5. the method for claim 1 is characterized in that, said time-domain resource is distributed and frequency domain resource is distributed for the user carries out, and specifically comprises:
Domain scheduling when carrying out according to the data volume of all kinds of downlink business of UE and QoS demand generates the priority query of UE;
The UE that is followed successively by in the priority query carries out frequency domain dispatching, distributes corresponding frequency domain resource.
6. method as claimed in claim 5 is characterized in that, the said UE that is followed successively by in the 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; Will be in subframe unallocated the Resources list of giving any UE is confirmed as single user and can be used PRB the Resources list, forms single user and can use the set of PRB the Resources list, in the Resources list of distributing to other UE; The Resources list that already used number of data layers is less than or equal to the predefined number of plies is confirmed as the multi-user and can be used PRB the Resources list, forms the multi-user and can use the set of PRB the Resources list;
When the single user who exists the Data-carrying ability to satisfy current UE transfer of data demand can use PRB the Resources list; The single user who then the Data-carrying ability is satisfied current UE transfer of data demand can distribute to current UE with PRB the Resources list, and definite modulating-coding strategy MCS information;
When the single user who does not exist the Data-carrying ability to satisfy current UE transfer of data demand can use PRB the Resources list:
Temporary single user can use single user of Data-carrying ability maximum in the set of PRB the Resources list can use PRB the Resources list;
Each main user in current UE and the set of multi-user's the Resources list is matched, and join
Distribution to resource;
When existing the Data-carrying ability to satisfy the Resources list of the main user of pairing of current UE transfer of data demand; Said Data-carrying ability is satisfied the Resources list of the main user of pairing of current UE transfer of data demand and distribute to current UE, and definite modulating-coding strategy MCS information;
When not existing the Data-carrying ability to satisfy the Resources list of the main user of pairing of current UE transfer of data demand; Relatively with the Resources list of the main user of current UE pairing in the maximum multi-user's list of available resources of Data-carrying ability and temporary single user can use that the maximum single user of Data-carrying ability can use PRB the Resources list in the set of PRB the Resources list; Select the big the Resources list of Data-carrying ability to distribute to current UE, and definite modulating-coding strategy MCS information.
7. method as claimed in claim 6 is characterized in that, said each main user in the set of current UE and multi-user's the Resources list is matched, and specifically comprises:
For per two UE that match; The spectrum efficiency of confirming 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 the figuration vector correlation property of confirming two UE is confirmed that current two UE can match, otherwise is confirmed that current two UE can not match during less than predefined relevant matches thresholding.
8. method as claimed in claim 6 is characterized in that, said distribution of matching resource specifically comprises:
When each channel condition satisfies in the Resources list of main UE of matching request; When having the available resources number more than or equal to the Resources list of pairing UE resource requirement number; In all available resources numbers the Resources list more than or equal to pairing UE resource requirement number, minimum the Resources list of difference of selecting the available resources number to deduct pairing UE resource requirement number is said pairing UE Resources allocation;
When each channel condition satisfies in the Resources list of main UE of matching request; When not having the available resources number more than or equal to the Resources list of pairing UE resource requirement number, minimum the Resources list of difference of selecting pairing UE resource requirement number to deduct the available resources number is said pairing UE Resources allocation.
9. a downlink transfer device is characterized in that, comprising:
The multi-user is transmitted definite unit, is used for confirming to activate multi-user's multiple-input and multiple-output MU-MIMO transmission;
Stream transmission is confirmed the unit, is used for confirming to adopt transmission of single current figuration or the transmission of double-current figuration according to channel situation;
Resource allocation unit is used to the user and carries out time-domain resource distribution and frequency domain resource distribution;
Data transmission unit, the resource that is used for passing through to be distributed is carried out downlink data transmission.
10. device as claimed in claim 9 is characterized in that, said multi-user is transmitted and confirmed that the unit specifically is used for:
Confirm to activate the 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.
11. device as claimed in claim 10 is characterized in that, said multi-user is transmitted and is confirmed that the unit specifically is used for:
Confirm in the measurement period PDSCH channel resource utilance greater than PDCCH channel resource utilance in the first threshold of setting, the measurement period less than second threshold value of setting; And 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 the measurement period is during greater than the 3rd threshold value; Activate the descending MU-MIMO transmission of current area; The resource-constrained situation that causes part UE to can not get dispatching owing to the PRB inadequate resource that is meant of said descending scheduling PDSCH, said descending scheduling PDCCH is resource-constrained to be meant because the unsuccessful situation that causes UE to can not get dispatching of PDCCH resource allocation.
12. device as claimed in claim 9 is characterized in that, said stream transmission is confirmed the unit, specifically is used for:
For the UE that adopts non-codebook mode reporting channel quality indicator (CQI) information, the channel information that measures according to detection reference signal SRS is that current UE confirms to adopt transmission of single current figuration or the transmission of double-current figuration through characteristic value decomposition;
For adopting codebook mode to report the UE of CQI information, it is that current UE confirms to adopt transmission of single current figuration or the transmission of double-current figuration that the order information indication RI that reports according to UE combines the feedback information of historical data transmission.
13. device as claimed in claim 9 is characterized in that, said resource allocation unit specifically is used for:
Domain scheduling when carrying out according to the data volume of all kinds of downlink business of UE and QoS demand generates the priority query of UE;
The UE that is followed successively by in the priority query carries out frequency domain dispatching, distributes corresponding frequency domain resource.
14. device as claimed in claim 13 is characterized in that, the UE that said resource allocation unit is followed successively by in the 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; Will be in subframe unallocated the Resources list of giving any UE is confirmed as single user and can be used PRB the Resources list, forms single user and can use the set of PRB the Resources list, in the Resources list of distributing to other UE; The Resources list that already used number of data layers is less than or equal to the predefined number of plies is confirmed as the multi-user and can be used PRB the Resources list, forms the multi-user and can use the set of PRB the Resources list;
When the single user who exists the Data-carrying ability to satisfy current UE transfer of data demand can use PRB the Resources list; The single user who then the Data-carrying ability is satisfied current UE transfer of data demand can distribute to current UE with PRB the Resources list, and definite modulating-coding strategy MCS information;
When the single user who does not exist the Data-carrying ability to satisfy current UE transfer of data demand can use PRB the Resources list:
Temporary single user can use single user of Data-carrying ability maximum in the set of PRB the Resources list can use PRB the Resources list;
Each main user in the set of current UE and multi-user's the Resources list is matched, and match the distribution of resource;
When existing the Data-carrying ability to satisfy the Resources list of the main user of pairing of current UE transfer of data demand; Said Data-carrying ability is satisfied the Resources list of the main user of pairing of current UE transfer of data demand and distribute to current UE, and definite modulating-coding strategy MCS information;
When not existing the Data-carrying ability to satisfy the Resources list of the main user of pairing of current UE transfer of data demand; Relatively with the Resources list of the main user of current UE pairing in the maximum multi-user's list of available resources of Data-carrying ability and temporary single user can use that the maximum single user of Data-carrying ability can use PRB the Resources list in the set of PRB the Resources list; Select the big the Resources list of Data-carrying ability to distribute to current UE, and definite modulating-coding strategy MCS information.
15. device as claimed in claim 14 is characterized in that, said resource allocation unit matches each the main user in current UE and the set of multi-user's the Resources list, specifically comprises:
For per two UE that match; The spectrum efficiency of confirming 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 the figuration vector correlation property of confirming two UE is confirmed that current two UE can match, otherwise is confirmed that current two UE can not match during less than predefined relevant matches thresholding.
16. device as claimed in claim 14 is characterized in that, said resource allocation unit matches the distribution of resource, specifically comprises:
When each channel condition satisfies in the Resources list of main UE of matching request; When having the available resources number more than or equal to the Resources list of pairing UE resource requirement number; In all available resources numbers the Resources list more than or equal to pairing UE resource requirement number, minimum the Resources list of difference of selecting the available resources number to deduct pairing UE resource requirement number is said pairing UE Resources allocation;
When each channel condition satisfies in the Resources list of main UE of matching request; When not having the available resources number more than or equal to the Resources list of pairing UE resource requirement number, minimum the Resources list of difference of selecting pairing UE resource requirement number to deduct the available resources number is said pairing UE Resources allocation.
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| PCT/CN2013/071941 WO2013127339A1 (en) | 2012-03-02 | 2013-02-27 | Method and apparatus for downlink transmission |
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| CN201210054242.XA CN102595385B (en) | 2012-03-02 | 2012-03-02 | Downlink transmission method and device |
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Also Published As
| Publication number | Publication date |
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| CN102595385B (en) | 2014-06-18 |
| WO2013127339A1 (en) | 2013-09-06 |
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