CN102122984B - Multi-user multi-input multi-output (MU-MIMO) transmission method, wireless communication system and base station - Google Patents
Multi-user multi-input multi-output (MU-MIMO) transmission method, wireless communication system and base station Download PDFInfo
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Abstract
The invention discloses a multi-user multi-input multi-output (MU-MIMO) transmission method and a base station. The method comprises the following steps: the base station configures a demodulation reference signal (DMRS) port for more than one cooperative transmission user equipment (UE) used for MU-MIMO transmission, generates downlink control signaling for ith UE in the more than one cooperative transmission UE, and recods the DMRS port information of the ith UE and the DMRS port information of the UE paired with the ith UE in the downlink control signaling; and the base station frames the precoding data of the more than one cooperative transmission UE and the downlink control signaling and then sends the framed precoding data of the more than one cooperative transmission UE and downlink control signaling to the more than one cooperative transmission UE. The method provided by the invention supports a non-transparent MU-MIMO transmission mode configured by the base station so that the UE has better receiving performance.
Description
Technical field
The present invention relates to wireless communication technology, espespecially a kind of multi-user's multiple-input and multiple-output (MU-MIMO) transmission method, wireless communication system and base station.
Background technology
In a wireless communication system, nontransparent multiuser MIMO (non-transparent MU-MIMO) technology is the hot spot technology that current standardization body (as 3gpp, WiMAX etc.) pays close attention to.The difference of nontransparent multiuser MIMO and transparent multiuser MIMO is: if any one participation in one group of cooperation transmission user terminal (UE) of MU-MIMO transmission can both know demodulated pilot signal (DMRS) information of its pairing UE, such as shared DMRS port (port), port number (rank) etc. are then nontransparent multiuser MIMO; If cannot know, it is transparent multiuser MIMO.Wherein, one group of cooperation transmission UE refers to by base station scheduling to more than one UE in same resource block (RB, Resource Block), below wherein will be called i-th UE by any one user terminal, and other UE except i-th UE are called pairing UE.Such as, assuming that UE1 and UE2 pairing constitutes MU-MIMO, so according to the DMRS port information whether having the UE2 of pairing, MU-MIMO transmission Mode Areas can be divided into transparent or nontransparent multiuser MIMO at UE1.As nothing, be then transparent; If any, be then nontransparent.
About adopting transparent multiuser MIMO or nontransparent multiuser MIMO technology in standardization body, also there is no final conclusion at present.But according to the discussion in nearest 3gpp RAN1 meeting, compare transparent multiuser MIMO, the performance expectation of nontransparent multiuser MIMO is better verified.Such as, for nontransparent multiuser MIMO, owing to can obtain the DMRS port information (such as DMRS port etc.) of pairing UE at i-th UE, therefore the decoder that the receiver supportable of this user terminal can be more excellent, such as AF panel merges (interference rejection combining, IRC) algorithm etc., thus obtain larger performance gain.But in transparent multiuser MIMO, i-th UE does not match the DMRS port information of UE, therefore can only use maximum-ratio combing (maximum ratio combining, MRC) algorithm when decoding.Table 1 illustrates the comparison of MRC and IRC on performance gain, and wherein IRC can improve about 15% on the average throughput of community, and cell boarder throughput can improve about 10%.
The performance gain of table 1 IRC and MRC compares
Correspondingly, how to realize nontransparent multiuser MIMO technology in a wireless communication system, become a problem needing to solve.Such as, how base station, after scheduling completes, notifies the DMRS port information etc. of its pairing of any one user (such as i-th user) UE in cooperation transmission user.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of Multi-user mimo transmissions method, wireless communication system and base station.
For achieving the above object, technical scheme of the present invention is specifically achieved in that
A kind of multi-user's multiple-input and multiple-output MU-MIMO transmission method, comprising:
Base station is that more than one the cooperation transmission user terminal UE carrying out MU-MIMO transmission arranges demodulated pilot signal DMRS port;
For i-th user terminal in described more than one cooperation transmission user terminal generates descending control signaling, in this descending control signaling, record the DMRS port information of i-th user terminal and the DMRS port information of its pairing user terminal;
Described base station, by after the pre-code data of described more than one cooperation transmission user terminal and described descending control signaling framing, sends to described more than one cooperation transmission user terminal.
The DMRS port information of described the DMRS port information and its pairing user terminal that record i-th user terminal in this descending control signaling comprises:
The first bitmap comprising all available DMRS port is set, the first bitmap marks the DMRS port that i-th user terminal takies;
Second bitmap of other the available DMRS port comprised except the DMRS port that i-th user terminal takies is set, in the DMRS port that the second bitmap subscript note pairing user terminal takies;
Described first bitmap and second figure are recorded in the descending control signaling of i-th user terminal.
Described first bitmap adopts N
portindividual bit represents, described second bitmap adopts N
port-Rank bit represents;
Wherein, N
portfor the number of all available DMRS port, described Rank be i-th user terminal take port number.
The DMRS port information of described the DMRS port information and its pairing user terminal that record i-th user terminal in this descending control signaling comprises:
That determines i-th user terminal takies port number, and determines the port starting point that this user terminal takies;
Second bitmap of other the available DMRS port comprised except the DMRS port that i-th user terminal takies is set, in the DMRS port that the second bitmap subscript note pairing user terminal takies;
Described port number, port starting point and the described second figure of taking is recorded in the descending control signaling of i-th user terminal.
The described port number that takies adopts
individual bit represents, described port starting point adopts
individual bit represents, described second bitmap adopts N
port-Rank bit represents;
Wherein, N
portfor the number of all available DMRS port, described Rank be i-th user terminal take port number.
Described more than one the cooperation transmission user terminal for carrying out MU-MIMO transmission arranges DMRS port and comprises:
For described more than one cooperation transmission user terminal arranges multiple continuous print DMRS port, and first DMRS port in all available DMRS port or last DMRS port are taken by described more than one cooperation transmission user terminal.
The DMRS port information of described the DMRS port information and its pairing user terminal that record i-th user terminal in this descending control signaling comprises:
Determine that the port of all cooperation transmission user terminals takies sum, and determine i-th user terminal take the port starting point that port number and this user terminal take;
Described port is taken sum, i-th user terminal take port number and port starting point is recorded in the descending control signaling of i-th user terminal.
The DMRS port information of described the DMRS port information and its pairing user terminal that record i-th user terminal in this descending control signaling comprises:
Determine that the port of all cooperation transmission user terminals takies sum;
The first bitmap comprising all available DMRS port is set, the first bitmap marks the DMRS port that i-th user terminal takies;
Described port is taken sum and described first bitmap be recorded in the descending control signaling of i-th user terminal.
Described port takies sum and adopts
individual bit represents, wherein N
portfor the number of all available DMRS port.
A base station in wireless communication system, comprising:
Demodulated pilot signal DMRS port setting unit, arranges DMRS port for more than for carrying out MU-MIMO transmission cooperation transmission user terminal;
Descending control signaling generation unit, for generating descending control signaling for i-th user terminal in described more than one cooperation transmission user terminal, in this descending control signaling, record the DMRS port information of i-th user terminal and the DMRS port information of its pairing user terminal;
Transmitting element, for by after the pre-code data of described more than one cooperation transmission user terminal and described descending control signaling framing, sends to described more than one cooperation transmission user terminal.
Described descending control signaling generation unit is used for:
The first bitmap comprising all available DMRS port is set, the first bitmap marks the DMRS port that i-th user terminal takies;
Second bitmap of other the available DMRS port comprised except the DMRS port that i-th user terminal takies is set, in the DMRS port that the second bitmap subscript note pairing user terminal takies;
Described first bitmap and second figure are recorded in the descending control signaling of i-th user terminal.
Described descending control signaling generation unit is used for:
That determines i-th user terminal takies port number, and determines the port starting point that this user terminal takies;
Second bitmap of other the available DMRS port comprised except the DMRS port that i-th user terminal takies is set, in the DMRS port that the second bitmap subscript note pairing user terminal takies;
Described port number, port starting point and the described second figure of taking is recorded in the descending control signaling of i-th user terminal.
Described descending control signaling generation unit is used for:
Determine that the port of all cooperation transmission user terminals takies sum, and determine i-th user terminal take the port starting point that port number and this user terminal take;
Described port is taken sum, i-th user terminal take port number and port starting point is recorded in the descending control signaling of i-th user terminal.
Described descending control signaling generation unit is used for:
Determine that the port of all cooperation transmission user terminals takies sum;
The first bitmap comprising all available DMRS port is set, the first bitmap marks the DMRS port that i-th user terminal takies;
Described port is taken sum and described first bitmap be recorded in the descending control signaling of i-th user terminal.
A kind of multi-user's multiple-input and multiple-output MU-MIMO transmission method, comprising:
Base station is that more than one the cooperation transmission user terminal UE carrying out MU-MIMO transmission arranges demodulated pilot signal DMRS port;
The DMRS port information of i-th user terminal is sent to described i-th user terminal by descending control signaling by described base station, and additional information is sent to described i-th user terminal;
Described i-th user terminal, according to self DMRS port information and described additional information, knows the DMRS port information of partly or entirely pairing user terminal.
Described additional information comprises: orthogonal covering codes OCC length or total DMRS port number, and DMRS density.
Describedly described i-th user terminal additional information is sent to comprise:
The OCC length of i-th user terminal or total DMRS port number and DMRS density are sent to described i-th user terminal by descending control signaling by base station.
Describedly described i-th user terminal additional information is sent to comprise:
Base station is by OCC length or total DMRS port number, and DMRS density is by semi-static configuration, informs described i-th user terminal.
Described semi-static configuration adopts radio resource control RRC signaling to realize.
A kind of wireless communication system, comprising:
Base station, for more than for carrying out MU-MIMO transmission cooperation transmission user terminal UE, demodulated pilot signal DMRS port is set, the DMRS port information of i-th user terminal is sent to described i-th user terminal by descending control signaling, and additional information is sent to described i-th user terminal, described additional information comprises: OCC length or total DMRS port number, and DMRS density;
I-th user terminal, for according to self DMRS port information and described additional information, knows the DMRS port information of partly or entirely pairing user terminal.
As seen from the above technical solution, this MU-MIMO transmission method of the present invention, use signaling format reasonable in design that the DMRS port information of all user terminals participating in cooperation transmission is sent to each user terminal in base station side, make any one user terminal participating in cooperation transmission while obtaining self DMRS port information, also obtain the DMRS port information of the user terminal matched with it, or know the DMRS port information of partly or entirely pairing user terminal according to self DMRS port information and additional information.Like this, more excellent receiver (as IRC) can be supported at user terminal, therefore compare traditional MRC and there is better receptivity.
Accompanying drawing explanation
Fig. 1 is the Performance comparision schematic diagram of MRC and IRC;
Fig. 2 is the flow chart of MU-MIMO transmission in one embodiment of the invention;
Fig. 3 illustrates the corresponding relation of DMRS port and mapping template in one embodiment of the invention;
Fig. 4 illustrates the corresponding relation of UE and DMRS port in one embodiment of the invention;
Fig. 5 is the distribution schematic diagram of the DMRS symbol in one embodiment of the invention with different DMRS density.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, to develop simultaneously embodiment referring to accompanying drawing, the present invention is described in more detail.
The present invention proposes a kind of specific implementation of nontransparent multiuser MIMO.Fig. 2 is the flow chart of MU-MIMO transmission in one embodiment of the invention.
In base station side:
Step 201: user terminal 1,2,3 is dispatched on same RB.That is, these 3 UE form a cooperation transmission group, and such as UE2 and UE3 is the pairing UE of UE1.
Step 202: the transmitted data symbols of each UE and DMRS symbol are carried out precoding (precoding) and superposed.Be specially: use precoding vectors g1 to carry out precoding to the x1/s1 of UE1, use g2 to carry out precoding to the x2/s2 of UE2, use g3 to carry out precoding to the x3/s3 of UE3, then by the data investigation after precoding.
Step 203: generate the descending control signaling (DL control signaling) comprising Downlink Control Information (downlink control information, DCI).Particularly, the descending control signaling of each UE comprises the Downlink Control Information of self, and wherein DCI1 is the Downlink Control Information of UE1, and DCI2 is the Downlink Control Information of UE2, and DCI3 is the Downlink Control Information of UE3.
Step 204-205: after pre-code data and descending control signaling framing (Framing), be mapped on many antennas.
I-th subscriber terminal side:
Step 206-207: receive the signal being used for channel estimating, obtain equivalent channel by channel estimating.Wherein, equivalent channel G1=Hig1, equivalent channel G2=Hig2, equivalent channel G3=Hig3.
Step 208: receive the signal being used for data demodulates.
Step 209-210: perform AF panel and merge (IRC), and obtain demodulation result.
After the scheduling of step 201 completes, the DMRS port information of the DMRS port information of i-th UE and its pairing UE is sent to i-th UE by descending control signaling by base station, thus realizes nontransparent multi-user MIMO transmissions.
Such as, the DMRS port information of all cooperation transmission UE is transmitted by the first bitmap and the second bitmap in base station, wherein: the first bitmap, for embodying i-th UE situation is taken to all available DMRS port, the DMRS port taken by i-th UE is set to 1, and other unappropriated DMRS port are set to 0; Second bitmap, takies situation for embodying pairing UE to other DMRS port except the DMRS port that i-th UE takies.And for example, the DMRS port information that port number and single UE port starting point transmit i-th UE is taken by single UE, by the DMRS port information of the second bitmap transmission pairing UE, wherein: single UE takies the number that port number is the DMRS port that i-th UE is assigned to, single UE port starting point is first DMRS port that i-th UE is assigned to.And for example, for the DMRS port continuous print situation that all cooperation transmission UE take, take sum by port, single UE takies port number and single UE port starting point transmits the DMRS port information of all cooperation transmission UE.For another example, sum can be taken by port and the first bitmap transmits the DMRS port information of all cooperation transmission UE.
Can find out, for the descending control signaling of different UEs, its comprise DMRS port information expression be different.Such as, for one group of cooperation transmission user terminal that UE1, UE2, UE3 are formed, the DMRS port information of UE1 is sent to comprise: the DMRS port information of UE1, the DMRS port information of UE2 and UE3, send to the DMRS port information of UE2 to comprise: the DMRS port information of UE2, the DMRS port information of UE1 and UE3, the content that these two DMRS port information represent is different.
Correspondingly, in subscriber terminal side, UEi receives the descending control signaling that base station sends, and determines the DMRS port shared by this UEi according to self the DMRS port information of wherein carrying (can be the first bitmap, or take port number+port starting point); The DMRS port shared by its pairing UE is determined according to the DMRS port information (can be the second bitmap, or port taking sum) of pairing UE.
Particularly, a corresponding a kind of DMRS mapping template of DMRS port.As shown in Figure 3, supposition has 3 DMRS port here.Wherein, DMRS Port-0 distributes to UE1, and DMRS Port-1 distributes to UE2, and DMRS Port-2 distributes to UE3.That is, the template that DMRS Port-0 is corresponding distributes to UE1, and the template that DMRS Port-1 is corresponding distributes to UE2, and the template that DMRS Port-2 is corresponding distributes to UE3.In these three templates, although the time-frequency location at DMRS symbol place is identical, orthogonal DMRS symbol s1, s2, s3 that different templates is corresponding different, and this corresponding relation is all known for base station side and subscriber terminal side.For each UE, as long as know the DMRS port information of self DMRS port information and pairing UE, just can know the template that corresponding DMRS port is corresponding, what namely imply knows DMRS symbol s1, s2, s3.Can find out, transmission DMRS port information, more much smaller than the signaling consumption directly being transmitted DMRS symbol s1, s2, s3 by descending control signaling.
Further, the invention allows for several concrete signaling format, generate descending control signaling according to this signaling format.Below, operational DMRS port number is expressed as N
port.
In form 0, adopt two bitmaps (bitmap) to represent the DMRS port information of self DMRS port information and pairing UE respectively, be specially: form 0=first bitmap+the second bitmap.Can find out, the maximum cost of form 0 is 2*N
port-1.
In a specific embodiment, suppose to have 8 for the Port of one group of cooperation transmission UE, the corresponding relation of UE and DMRS port as shown in Figure 4.Wherein, UEi uses Port-1 (see oblique line portion), and namely its port number taken (rank) is 1, then the bitmap for self the DMRS port information representing UEi is 01000000; Its pairing UE uses Port-0, Port-3, Port-7 (see a filling part), then the 2nd bitmap for the DMRS port information representing pairing UE is 1010001.Can find out, a bitmap is 8 bits, and the 2nd bitmap is 7 bits.
In the DMRS port information of group cooperation transmission UE of represented by form 1, self DMRS port information is simplified, is specifically expressed as: the single UE of form 1=takies port number+single UE port starting point+the second bitmap.Wherein, single UE takies the Port number that port number takies for representing UEi self, and single UE port starting point is for representing the initial Port that UEi self takies, and the second bitmap is for representing the Port service condition of other pairings UE.Can find out, the maximum cost of form 1 is:
it may be noted that these Port should be continuous print, therefore can represent self DMRS port information with " port number+starting point " replacement " the first bitmap " if distribute multiple Port for UEi.
In a specific embodiment, UEi uses Port-1, and taking port number is 1, other pairing user terminals use Port-0, Port-3, Port-5, Port-7, then: take port number and be expressed as 000, port starting point is expressed as 001, and second figure is expressed as 1010101.
In addition, when the DMRS port information consecutive hours of one group of cooperation transmission user terminal, can represent by using form 2, be specially: form 2=port takies sum+unique user and takies port number+unique user port starting point.Wherein, port takies the port sum of sum for representing that this group cooperation transmission user terminal takies, and the definition that unique user takies in port number and unique user port starting point and form 1 is similar, repeats no more herein.The maximum cost of form 2 is:
it may be noted that and be applicable to expression one group of cooperation transmission UE by form 2 to take port continuous, and at least one the occupied situation in head end mouth and end port.
In a specific embodiment, UEi uses Port-1, and taking port number is 1, other pairing user terminals use Port-0, Port-2 to Port-5, then: port takies sum and is expressed as 101, unique user takies port number and is expressed as 000, and unique user port starting point is expressed as 001.
Further, can with form 3 represent one group of cooperation transmission user terminal, continuous print DMRS port information, be specially: form 3=port takies sum+the first bitmap, and its maximum cost is
Table 2 is with N
port=8 is example, illustrates that the maximum cost of different signaling format compares.Wherein, increasing percentage is the pairing DMRS port information of UE and the ratio of self DMRS port information, for representing nontransparent multiuser MIMO and the overhead bit only transmitting increase compared with self DMRS information.
The maximum cost comparative example of the different signaling format of table 2
In concrete scene, the maximum cost of above-mentioned signaling format 0-3 also can reduce further, as shown in table 3.
Scene 1:N
porthave at most 4 UE in=8, cooperation transmission group, each UE distributes at most 2 DMRS port.
Scene 2:N
porthave at most 2 UE in=4, cooperation transmission group, each UE distributes at most 2 DMRS port.
Scene 3:N
porthave at most 4 UE in=4, cooperation transmission group, each UE distributes at most 1 DMRS port.
Signaling consumption in the concrete scene of table 3
In addition, after the scheduling of step 201 completes, the DMRS port information of i-th UE and additional information also can (comprise: orthogonal covering codes (Orthogonal Cover Code by base station, OCC) length or total DMRS port number, and DMRS density etc.) send to i-th UE, thus realize nontransparent multi-user MIMO transmissions.I-th UE, according to self the DMRS port information received, simultaneously in conjunction with additional information, all or part ofly can know the DMRS port distribution condition of all UE in cooperation transmission group.It may be noted that DMRS density is Resource Unit (RE, the resource element) number that DMRS symbol takies in a RB, one of them RB comprises multiple RE; Total DMRS port number is the number of all available DMRS port.
In a specific implementation, additional information according to the corresponding relation shown in table 4, for multiple UE arranges DMRS port, and can be informed UE according to mode 1 or mode 2 by base station.Such as: when total DMRS port number is 4, DMRS density is 24, OCC length is 2.
| Total DMRS port number | 2 | 4 | 8 |
| DMRS density | 12 | 24 | 24 |
| OCC length | 2 | 2 | 2 or 4 |
The corresponding relation of the DMRS port number that table 4 is total and DMRS density, OCC length
Mode 1: by the Downlink Control Information in descending control signaling, DMRS density, OCC length or total DMRS port number are informed corresponding UE, be specially: two bit are set in Downlink Control Information.Wherein, a bit for representing DMRS density, such as: 1 represent 12RE, 0 represent 24RE.Fig. 5 illustrates the DMRS symbol distribution of these two kinds of DMRS density, and oblique line is filled and some filling part is DMRS symbol, and wherein the DMRS density of (a) is 12, and the DMRS density of (b) is 24.The implication of another bit is as follows: when OCC length total DMRS port number be 8 give a definition be 4 time, base station utilizes this bit to indicate OCC length to UE, and such as 1 represents that 4,0 represents 2; When all OCC length is all defined as 2, base station utilizes this bit to indicate total DMRS port number (now only needing differentiation 4 and 8) to UE, and the such as total DMRS port number of 1 expression is the total DMRS port number of 4,0 expression is 8.
Mode 2: carry out semi-static configuration by modes such as wireless heterogeneous networks (RRC, Radio Resource Control) signalings, by OCC length or total DMRS port number, and DMRS density informs corresponding UE.
Further, the present invention also provides a kind of wireless communication system, comprising:
Base station, for more than for carrying out MU-MIMO transmission cooperation transmission user terminal UE, demodulated pilot signal DMRS port is set, the DMRS port information of i-th user terminal and additional information are sent to described i-th user terminal, described additional information comprises: OCC length or total DMRS port number, and DMRS density;
I-th user terminal, for according to self DMRS port information and in conjunction with described additional information, knows the DMRS port information of partly or entirely pairing user terminal.
Further, present invention also offers the base station in a kind of wireless communication system, comprising:
DMRS port setting unit, arranges DMRS port for more than for carrying out MU-MIMO transmission cooperation transmission user terminal;
Descending control signaling generation unit, for generating Downlink Control Information for i-th user terminal in described more than one cooperation transmission user terminal, in this Downlink Control Information, record the DMRS port information of i-th user terminal and the DMRS port information of its pairing user terminal, and generate the descending control signaling comprising this Downlink Control Information;
Transmitting element, for by after the pre-code data of described more than one cooperation transmission user terminal and described descending control signaling framing, sends to described more than one cooperation transmission user terminal.
In an embodiment of the invention, described descending control signaling generation unit is used for:
The first bitmap comprising all available DMRS port is set, the first bitmap marks the DMRS port that i-th user terminal takies;
Second bitmap of other the available DMRS port comprised except the DMRS port that i-th user terminal takies is set, in the DMRS port that the second bitmap subscript note pairing user terminal takies;
Described first bitmap and second figure are recorded in the descending control signaling of i-th user terminal, specifically see form 0.
In an embodiment of the invention, described descending control signaling generation unit is used for:
That determines i-th user terminal takies port number, and determines the port starting point that this user terminal takies;
Second bitmap of other the available DMRS port comprised except the DMRS port that i-th user terminal takies is set, in the DMRS port that the second bitmap subscript note pairing user terminal takies;
Described port number, port starting point and the described second figure of taking is recorded in the descending control signaling of i-th user terminal, specifically see form 1.
In an embodiment of the invention, described descending control signaling generation unit is used for:
Determine that the port of all cooperation transmission user terminals takies sum, and determine i-th user terminal take the port starting point that port number and this user terminal take;
Described port is taken sum, i-th user terminal take port number and port starting point is recorded in the descending control signaling of i-th user terminal, specifically see form 2.
In an embodiment of the invention, described descending control signaling generation unit is used for:
Determine that the port of all cooperation transmission user terminals takies sum;
The first bitmap comprising all available DMRS port is set, the first bitmap marks the DMRS port that i-th user terminal takies;
Described port is taken sum and described first bitmap be recorded in the descending control signaling of i-th user terminal, specifically see form 3.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (20)
1. multi-user's multiple-input and multiple-output MU-MIMO transmission method, is characterized in that, comprising:
Base station is that more than one the cooperation transmission user terminal UE carrying out MU-MIMO transmission arranges demodulated pilot signal DMRS port;
For i-th user terminal in described more than one cooperation transmission user terminal generates descending control signaling, in this descending control signaling, record the DMRS port information of i-th user terminal and the DMRS port information of its pairing user terminal;
Described base station, by after the pre-code data of described more than one cooperation transmission user terminal and described descending control signaling framing, sends to described more than one cooperation transmission user terminal.
2. method according to claim 1, is characterized in that, the DMRS port information of described the DMRS port information and its pairing user terminal that record i-th user terminal in this descending control signaling comprises:
The first bitmap comprising all available DMRS port is set, the first bitmap marks the DMRS port that i-th user terminal takies;
Second bitmap of other the available DMRS port comprised except the DMRS port that i-th user terminal takies is set, in the DMRS port that the second bitmap subscript note pairing user terminal takies;
Described first bitmap and second figure are recorded in the descending control signaling of i-th user terminal.
3. method according to claim 2, is characterized in that, described first bitmap adopts N
portindividual bit represents, described second bitmap adopts N
port-Rank bit represents;
Wherein, N
portfor the number of all available DMRS port, described Rank be i-th user terminal take port number.
4. method according to claim 1, is characterized in that, the DMRS port information of described the DMRS port information and its pairing user terminal that record i-th user terminal in this descending control signaling comprises:
That determines i-th user terminal takies port number, and determines the port starting point that this user terminal takies;
Second bitmap of other the available DMRS port comprised except the DMRS port that i-th user terminal takies is set, in the DMRS port that the second bitmap subscript note pairing user terminal takies;
Described port number, port starting point and the described second figure of taking is recorded in the descending control signaling of i-th user terminal.
5. method according to claim 4, is characterized in that, described in take port number adopt
individual bit represents, described port starting point adopts
individual bit represents, described second bitmap adopts N
port-Rank bit represents;
Wherein, N
portfor the number of all available DMRS port, described Rank be i-th user terminal take port number.
6. method according to claim 1, is characterized in that, described more than one the cooperation transmission user terminal for carrying out MU-MIMO transmission arranges DMRS port and comprises:
For described more than one cooperation transmission user terminal arranges multiple continuous print DMRS port, and first DMRS port in all available DMRS port or last DMRS port are taken by described more than one cooperation transmission user terminal.
7. method according to claim 6, is characterized in that, the DMRS port information of described the DMRS port information and its pairing user terminal that record i-th user terminal in this descending control signaling comprises:
Determine that the port of all cooperation transmission user terminals takies sum, and determine i-th user terminal take the port starting point that port number and this user terminal take;
Described port is taken sum, i-th user terminal take port number and port starting point is recorded in the descending control signaling of i-th user terminal.
8. method according to claim 6, is characterized in that, the DMRS port information of described the DMRS port information and its pairing user terminal that record i-th user terminal in this descending control signaling comprises:
Determine that the port of all cooperation transmission user terminals takies sum;
The first bitmap comprising all available DMRS port is set, the first bitmap marks the DMRS port that i-th user terminal takies;
Described port is taken sum and described first bitmap be recorded in the descending control signaling of i-th user terminal.
9. the method according to claim 7 or 8, is characterized in that, described port takies sum and adopts
individual bit represents, wherein N
portfor the number of all available DMRS port.
10. the base station in wireless communication system, is characterized in that, comprising:
Demodulated pilot signal DMRS port setting unit, arranges DMRS port for more than for carrying out MU-MIMO transmission cooperation transmission user terminal;
Descending control signaling generation unit, for generating descending control signaling for i-th user terminal in described more than one cooperation transmission user terminal, in this descending control signaling, record the DMRS port information of i-th user terminal and the DMRS port information of its pairing user terminal;
Transmitting element, for by after the pre-code data of described more than one cooperation transmission user terminal and described descending control signaling framing, sends to described more than one cooperation transmission user terminal.
11. base stations according to claim 10, is characterized in that, described descending control signaling generation unit is used for:
The first bitmap comprising all available DMRS port is set, the first bitmap marks the DMRS port that i-th user terminal takies;
Second bitmap of other the available DMRS port comprised except the DMRS port that i-th user terminal takies is set, in the DMRS port that the second bitmap subscript note pairing user terminal takies;
Described first bitmap and second figure are recorded in the descending control signaling of i-th user terminal.
12. base stations according to claim 10, is characterized in that, described descending control signaling generation unit is used for:
That determines i-th user terminal takies port number, and determines the port starting point that this user terminal takies;
Second bitmap of other the available DMRS port comprised except the DMRS port that i-th user terminal takies is set, in the DMRS port that the second bitmap subscript note pairing user terminal takies;
Described port number, port starting point and the described second figure of taking is recorded in the descending control signaling of i-th user terminal.
13. base stations according to claim 10, is characterized in that, described descending control signaling generation unit is used for:
Determine that the port of all cooperation transmission user terminals takies sum, and determine i-th user terminal take the port starting point that port number and this user terminal take;
Described port is taken sum, i-th user terminal take port number and port starting point is recorded in the descending control signaling of i-th user terminal.
14. base stations according to claim 10, is characterized in that, described descending control signaling generation unit is used for:
Determine that the port of all cooperation transmission user terminals takies sum;
The first bitmap comprising all available DMRS port is set, the first bitmap marks the DMRS port that i-th user terminal takies;
Described port is taken sum and described first bitmap be recorded in the descending control signaling of i-th user terminal.
15. 1 kinds of multi-user's multiple-input and multiple-output MU-MIMO transmission methods, is characterized in that, comprising:
Base station is that more than one the cooperation transmission user terminal UE carrying out MU-MIMO transmission arranges demodulated pilot signal DMRS port;
The DMRS port information of i-th user terminal is sent to described i-th user terminal by descending control signaling by described base station, and additional information is sent to described i-th user terminal;
Described i-th user terminal, according to self DMRS port information and described additional information, knows the DMRS port information of partly or entirely pairing user terminal.
16. methods according to claim 15, is characterized in that, described additional information comprises: orthogonal covering codes OCC length or total DMRS port number, and DMRS density.
17. methods according to claim 16, is characterized in that, describedly additional information are sent to described i-th user terminal to comprise:
The OCC length of i-th user terminal or total DMRS port number and DMRS density are sent to described i-th user terminal by descending control signaling by base station.
18. methods according to claim 16, is characterized in that, describedly additional information are sent to described i-th user terminal to comprise:
Base station is by OCC length or total DMRS port number, and DMRS density is by semi-static configuration, informs described i-th user terminal.
19. methods according to claim 18, is characterized in that, described semi-static configuration adopts radio resource control RRC signaling to realize.
20. 1 kinds of wireless communication systems, is characterized in that, comprising:
Base station, for more than for carrying out MU-MIMO transmission cooperation transmission user terminal UE, demodulated pilot signal DMRS port is set, the DMRS port information of i-th user terminal is sent to described i-th user terminal by descending control signaling, and additional information is sent to described i-th user terminal, described additional information comprises: OCC length or total DMRS port number, and DMRS density;
I-th user terminal, for according to self DMRS port information and described additional information, knows the DMRS port information of partly or entirely pairing user terminal.
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| CN201010002345.2A CN102122984B (en) | 2010-01-11 | 2010-01-11 | Multi-user multi-input multi-output (MU-MIMO) transmission method, wireless communication system and base station |
| JP2010273406A JP5661441B2 (en) | 2010-01-11 | 2010-12-08 | Multi-user multi-input multi-output (MU-MIMO) transmission method, radio communication system, and base station |
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| CN201010002345.2A CN102122984B (en) | 2010-01-11 | 2010-01-11 | Multi-user multi-input multi-output (MU-MIMO) transmission method, wireless communication system and base station |
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| JP5996540B2 (en) * | 2011-08-05 | 2016-09-21 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカＰａｎａｓｏｎｉｃ Ｉｎｔｅｌｌｅｃｔｕａｌ Ｐｒｏｐｅｒｔｙ Ｃｏｒｐｏｒａｔｉｏｎ ｏｆ Ａｍｅｒｉｃａ | Transmitting apparatus and transmitting method |
| CN102355724B (en) * | 2011-08-09 | 2017-05-24 | 中兴通讯股份有限公司 | Method and base station for notifying power information |
| FR2982103A1 (en) * | 2011-10-28 | 2013-05-03 | France Telecom | PROCESS FOR TRANSMITTING FRAMES, STATIONS AND CORRESPONDING COMPUTER PROGRAM |
| US9215694B2 (en) * | 2011-12-22 | 2015-12-15 | Qualcomm Incorporated | Reference signals design for time tracking in LTE-A |
| CN103312389B (en) | 2012-03-06 | 2016-05-25 | 华为技术有限公司 | A kind of multiuser interference suppression method, terminal and base station |
| JP6208409B2 (en) * | 2012-04-06 | 2017-10-04 | 株式会社Ｎｔｔドコモ | User device and communication method |
| CN103378883B (en) * | 2012-04-19 | 2016-09-28 | 电信科学技术研究院 | Frequency-domain equilibrium method under the conditions of a kind of up MU-MIMO and device |
| WO2014043898A1 (en) * | 2012-09-21 | 2014-03-27 | 华为技术有限公司 | Method, bs and ue for sending and receiving data |
| CN103874207A (en) * | 2012-12-14 | 2014-06-18 | 华为技术有限公司 | Resource mapping method, base station and user equipment |
| WO2014161134A1 (en) * | 2013-04-01 | 2014-10-09 | 华为技术有限公司 | Method for determining paired users, user equipment, base station, and joint detection method |
| JP2017539136A (en) * | 2014-11-07 | 2017-12-28 | 富士通株式会社 | DM-RS information instruction method, apparatus, and communication system |
| CN105846976A (en) * | 2015-01-15 | 2016-08-10 | 株式会社Ntt都科摩 | Multi-user multiple-input multiple-output transmission method and base station in wireless communication system |
| CN106487433A (en) * | 2015-08-31 | 2017-03-08 | 北京信威通信技术股份有限公司 | For transmitting device and the system of multiuser MIMO control information |
| CN106559196B (en) * | 2015-09-25 | 2019-10-22 | 华为技术有限公司 | A kind of method and device of pilot tone distribution |
| CN106685580B (en) | 2015-11-06 | 2020-03-03 | 中兴通讯股份有限公司 | Data processing method and device |
| WO2017101973A1 (en) * | 2015-12-14 | 2017-06-22 | Huawei Technologies Co., Ltd. | Information provision and processing for receiver driven precoding |
| CN108377571B (en) * | 2016-11-09 | 2021-12-07 | 上海诺基亚贝尔股份有限公司 | Method and apparatus for multi-user superposition transmission (MUST) |
| WO2018184169A1 (en) * | 2017-04-06 | 2018-10-11 | Qualcomm Incorporated | Multiple user port loading indication |
| WO2018227337A1 (en) | 2017-06-12 | 2018-12-20 | Qualcomm Incorporated | Techniques and apparatuses for signaling regarding bandwidth dependent control size |
| CN109802807B (en) | 2017-11-17 | 2020-07-28 | 电信科学技术研究院 | Information indication method, resource determination method, information indication device, resource determination device and computer storage medium |
| CN111869140B (en) * | 2018-09-11 | 2022-01-25 | Oppo广东移动通信有限公司 | Communication method, terminal equipment and network equipment |
| CN112312552B (en) * | 2019-07-31 | 2022-05-24 | 华为技术有限公司 | Data transmission method, device and system |
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| JP2011142620A (en) | 2011-07-21 |
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