CN102882566A - Method and equipment for reducing transmission interlamination interference in multi-user MIMO (Multiple Input Multiple Output) system - Google Patents
Method and equipment for reducing transmission interlamination interference in multi-user MIMO (Multiple Input Multiple Output) system Download PDFInfo
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Abstract
The invention relates to the technical field of communication and discloses a method and equipment for reducing transmission interlamination interference in a multi-user MIMO (Multiple Input Multiple Output) system. The method comprises the following steps that: a base station is a multiple-access MIMO and is provided with four orthogonal DM-RS (Demodulation-Reference Signals) ports which respectively include a port 7, a port 8, a port 9 and a port 10; the number of transmission layers and the DM-RS ports corresponding to each layer are distributed for a relay node; the distributed number of the transmission layers, information of the DM-RS ports corresponding to each layer and bit information corresponding to a DM-RS resource occupation condition are announced to the relay node; a special frequency guide signal is sent to the relay node by a time frequency resource corresponding to the distributed DM-RS ports; and data is sent to the relay node by using other time frequency resources except resources corresponding to the distributed DM-RS ports. With the adoption of the invention, an application scene of the DM-RS only exists in a first time slot of one sub-frame; and when the total layer number of a MU-MIMO (Multi-User Multiple Input Multiple Output) is more than 2, the performance of the MU-MIMO is effectively improved.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of method and apparatus that reduces transmission interlayer interference in the multi-user MIMO system.
Background technology
At LTE-Advanced (Long Term Evolution Advanced, advanced Long Term Evolution) in the system, the data throughout performance of MIMO (Multiple-Input and Multiple-Output, multi-emitting receives more) precoding technique elevator system can be adopted in the base station.The MIMO precoding technique comprises SU-MIMO (Single-User MIMO, alone family multi-emitting receives more) precoding and MU-MIMO (Multi-User MIMO, multi-user's multi-emitting receives more) precoding.For the SU-MIMO precoding, 1 UE (User Equipment, subscriber equipment) is only served at identical running time-frequency resource in the base station.And for the MU-MIMO precoding, a plurality of UE are served at identical running time-frequency resource in the base station.Be compared to the SU-MIMO precoding, the MU-MIMO precoding can realize larger throughput of system.
In the LTE-Advanced system, transmitting terminal known reference signal in base station is used for the channel estimating of UE.A kind of reference signal is DM-RS (Demodulation Refrrence Signals, demodulated reference signal).The base station is by the DM-RS port of the descending control signaling notice employed transmission number of plies of UE and each layer correspondence.At receiving terminal, the reception signal that UE is corresponding according to each DM-RS port obtains the needed channel estimation value of data demodulates, and carries out corresponding data demodulates according to this channel estimation value, obtains business datum.
DM-RS port corresponding to each transport layer quadrature of should trying one's best does not disturb between each transport layer when guaranteeing channel estimating.The quadrature of DM-RS port can pass through CDM (Code Division Multiplexing, code division multiplexing), FDM (Frequency Division Multiplexing, frequency division multiplexing), TDM (Time Division Multiplexing, time division multiplexing) or their combination realize.Adopt CDM+FDM to support maximum 8 quadrature DM-RS ports among the LTE-Advanced, thereby support maximum 8 layers of transmission.
In the LTE-Advanced system, each UE supports at most 2 layers of MU-MIMO transmission, and the number of plies summation of all pairing UE is no more than 4.The DM-RS port that two quadratures are arranged when adopting the MU-MIMO transmission, if therefore the total number of plies of data of MU-MIMO transmission is 2, then each layer can take respectively 1 DM-RS port wherein.But, when the total number of plies of pairing UE greater than 2 the time, the performance of MU-MIMO will be subject to the impact of nonopiate DM-RS port, thereby disturbs the performance that affects channel estimating because cause between the nonopiate DM-RS port.
Summary of the invention
The embodiment of the invention provides a kind of method and apparatus that reduces transmission interlayer interference in the multi-user MIMO system, with the total number of plies of data that solves the MU-MIMO transmission greater than 2 o'clock, between transport layer because nonopiate DM-RS port produces disturbs, affect the MU-MIMO systematic function between inscribe.
On the one hand, provide a kind of method that reduces transmission interlayer interference in the multi-user MIMO system, having comprised:
The base station is that multiuser MIMO arranges four quadrature DM-RS ports, is respectively: port 7, port 8, port 9 and port one 0;
The DM-RS port that distributes the transmission number of plies and each layer correspondence for via node;
Notify described via node with information and the corresponding bit information of DM-RS occupation condition of the DM-RS port of the transmission number of plies of distributing, each layer correspondence;
Use running time-frequency resource corresponding to DM-RS port that distributes to send dedicated pilot signal to described via node;
Other running time-frequency resources outside resource corresponding to the DM-RS port that use to distribute send data to described via node.
On the other hand, also provide a kind of method that reduces transmission interlayer interference in the multi-user MIMO system, comprising:
Information and the corresponding bit information of DM-RS occupation condition of the transmission number of plies of via node reception base station assigns, the DM-RS port of each layer correspondence, described DM-RS port-for-port 7, port 8, port 9 and/or port one 0;
Described via node receives dedicated pilot signal, and described dedicated pilot signal is that described base station sends by running time-frequency resource corresponding to the DM-RS port of described distribution;
Described via node receive data, described data are that other running time-frequency resources outside resource corresponding to the DM-RS port of base station use distribution send.
On the other hand, also provide a kind of equipment that reduces transmission interlayer interference in the multi-user MIMO system, having comprised:
Setting unit is used to multiuser MIMO that four quadrature DM-RS ports are set, and is respectively: port 7, port 8, port 9 and port one 0;
Allocation units, the DM-RS port that is used to via node to distribute the described setting unit of the transmission number of plies and each layer correspondence to arrange;
Notification unit is used for distributing information and the corresponding bit information of DM-RS occupation condition of the DM-RS port of the transmission number of plies, each layer correspondence to notify described via node described allocation units;
Transmitting element, running time-frequency resource corresponding to DM-RS port that is used for using described allocation units to distribute sends dedicated pilot signal to described via node, and other running time-frequency resources outside resource corresponding to the DM-RS port that uses described allocation units to distribute send data to described via node.
On the other hand, also provide a kind of equipment that reduces transmission interlayer interference in the multi-user MIMO system, having comprised:
Receiving element be used for to receive information and the corresponding bit information of DM-RS occupation condition of DM-RS port of the transmission number of plies, each layer correspondence of base station assigns, described DM-RS port-for-port 7, port 8, port 9 and/or port one 0; And reception dedicated pilot signal, described dedicated pilot signal is that described base station sends by running time-frequency resource corresponding to the DM-RS port of described distribution, and receive data, described data are that other running time-frequency resources outside resource corresponding to the DM-RS port of base station use distribution send.
The method and apparatus of transmission interlayer interference in the reduction multi-user MIMO system that the embodiment of the invention provides, the application scenarios that DM-RS is only arranged in the 1st time slot for 1 subframe, the DM-RS port of four quadratures is provided for MU-MIMO, thereby can be in the total number of plies of MU-MIMO greater than 2 o'clock, the corresponding resource of the DM-RS port of four quadratures keeps the frequency division state, can not produce interference, Effective Raise based on the precision of the channel estimating of DM-RS, improve the performance of MU-MIMO.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use among the embodiment, apparently, the accompanying drawing that the following describes only is some embodiment that put down in writing among the present invention, for those of ordinary skills, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1, Fig. 2 are the schematic diagrames that MU-MIMO supports the DM-RS port of 2 quadratures in the existing LTE-Advanced system;
Fig. 3 is the schematic diagram that has DM-RS port corresponding when transmission mode is configured to TM9 in the TE-Advanced system now;
Fig. 4 is the schematic diagram of DM-RS port in the relay backhaul channel in the existing TE-Advanced system;
Fig. 5 is the flow chart that the embodiment of the invention reduces the method for transmission interlayer interference in the MU-MIMO system;
Fig. 6 is the schematic diagram of four quadrature DM-RS ports providing for MU-MIMO in the embodiment of the invention;
Fig. 7 is a kind of structural representation that the embodiment of the invention reduces the equipment of transmission interlayer interference in the MU-MIMO system;
Fig. 8 is the flow chart that another embodiment of the present invention reduces the method for transmission interlayer interference in the multi-user MIMO system.
Embodiment
In order to make those skilled in the art person understand better the scheme of the embodiment of the invention, below in conjunction with drawings and embodiments the embodiment of the invention is described in further detail.
The below is at first to only supporting the situation of the DM-RS port of 2 quadratures simply to introduce in the MU-MIMO pilot settings in the existing LTE-Advanced system.
As shown in Figure 1 and Figure 2, be the schematic diagram of DM-RS port in the MU-MIMO pilot settings in the existing LTE-Advanced system.
The DM-RS port of two quadratures is respectively port 7 and port 8, and wherein, Fig. 1 is the schematic diagram of port 7, and Fig. 2 is the schematic diagram of port 8.Port7 takies identical running time-frequency resource with port8, and both are superimposed in a code minute mode by OCC (Orthogonal Cover Code, quadrature mask), and the OCC code length is 2, and is as shown in table 1 below, supports two quadrature DM-RS ports.
Table 1
Port7 and port 8 support respectively two SCID (Scrambling Identity, scrambler sign) value, namely 0 and 1, can obtain non-orthogonal DM-RS port by adopting different SCID values.The LTE-Advanced system can support maximum 8 layers of transmission, and corresponding DM-RS pattern as shown in Figure 3.Wherein: grid frame represents the reference signal of cell-level; The point-like frame table shows port7 and port 8, tiltedly wire frame representation port9 and port 10.
UE can obtain the base station for the transmission number of plies of its distribution, the DM-RS port numbers of each layer correspondence/SCID information from Downlink Control Information, as shown in table 2 below.
Table 2:
The DM-RS port that two quadratures are arranged when adopting MU-MIMO, if therefore the total number of plies of data of MU-MIMO transmission is 2, then each layer can take respectively 1 DM-RS port wherein.For example, if adopt MU-MIMO to serve simultaneously two UE, the transmission number of plies of each UE is 1, then can option table 2 in sequence number be 0 and 2 pilot tone combination, namely " 1 layer, port 7, n
SCID=0 " and " 1 layer, port 8, n
SCID=0 "; At this moment, two users distinguish by DM-RS port port7 and the port8 of quadrature.
But, when the total number of plies of pairing user greater than 2 the time, the performance of MU-MIMO will be subject to the impact of nonopiate DM-RS port, thereby disturbs the performance that affects channel estimating because can cause between the nonopiate DM-RS port.For example, if total number of plies of MU-MIMO transmission is 3, each user's the transmission number of plies is 1, can option table 2 in sequence number be 0,1 and 2 pilot tone combination, namely " 1 layer, port 7, n
SCID=0 ", " 1 layer, port 7, n
SCID=1 " and " 1 layer, port 8, n
SCID=0 "; At this moment, " 1layer, port 7, n
SCID=0 " and " 1layer, port 7, n
SCID=1 " corresponding DM-RS port is identical, all is port7, only with n
SCIDDistinguish, but both complete quadratures can be introduced the demodulation interference.
For coverage and the power system capacity that improves the residential quarter; usually can adopt relaying technique; send the interference that data produce the via node receiver from the base station receive data with to the user simultaneously for fear of via node; the regulation via node can not carry out above-mentioned these two operations simultaneously in existing protocol, need to certain time interval be arranged as change-over time at these two operation rooms.Therefore, in the relay backhaul channel, based on this restriction, under some scene, last 1 OFDM of 1 subframe (Orthogonal Frequency Division Multiplexing, OFDM) symbol can not be used for the base station to the transmission of via node.In this case, the DM-RS port as shown in Figure 4.
As seen from Figure 4, under this scene, the 2nd time slot of 1 subframe will not have the DM-RS port.At this moment, channel estimating can not be carried out interpolation (purpose of interpolation is the channel estimating that obtains without the pilot resources place) between two time slots, so nonopiate DM-RS port can cause the larger performance loss of MU-MIMO.
For the total number of plies of data of MU-MIMO transmission in the above-mentioned prior art greater than 2 o'clock, owing to producing, disturbs nonopiate DM-RS port between transport layer, affect the problem of MU-MIMO systematic function, the embodiment of the invention provides the method and apparatus of transmission interlayer interference in a kind of MU-MIMO of the reduction system, so that when in 1 subframe only the 1st time slot DM-RS port and the total number of plies of MU-MIMO are arranged greater than 2 the time, can obtain mutually orthogonal DM-RS port between each transport layer.
As shown in Figure 5, be the flow chart that the embodiment of the invention reduces the method for transmission interlayer interference in the MU-MIMO system, may further comprise the steps:
As shown in Figure 6, above-mentioned four quadrature DM-RS ports adopt CDM (Code division multiplexing, code division multiplexing)+FDM (Frequency division multiplexing, frequency division multiplexing).Wherein, port 7 and port 8 take identical running time-frequency resource and are that 2 OCC distinguishes by the length in the table 1; Similarly, port 9 takies identical running time-frequency resource with port 10, and is 2 OCC differentiation by length in the table 1.Distinguish by frequency resource between port 7, port 8 and port 9, the port 10, namely port 7, port 8 take respectively different frequency resources from port 9, port 10.
Information and the corresponding bit information of DM-RS occupation condition of the transmission number of plies that can will distribute by descending control signaling particularly,, the DM-RS port of each layer correspondence are notified described via node.
The base station arranges the number of plies of scheduling, the corresponding relation that the port numbers of distributing and DM-RS running time-frequency resource take situation, every kind of corresponding relation represents with a bit value, DM-RS running time-frequency resource wherein takies situation and represents with halfDM-RS or full DM-RS, the transmission number of plies that the base station will distributed, when the information of the DM-RS port of each layer correspondence and the corresponding bit information of occupation condition are notified described via node, the base station is the DM-RS port-for-port 7 that distributes of via node or/and during port 8, if the running time-frequency resource of port 9 and port one 0 correspondence is taken by DM-RS, then the described via node number of plies is notified in the base station, port numbers, the corresponding bit information of full DM-RS; If the running time-frequency resource of port 9 and port one 0 correspondence is not taken by DM-RS, then the described via node number of plies, port numbers, the corresponding bit information of half DM-RS are notified in the base station.
Such as, notify to via node by the mode of following table 3.
Table 3:
Wherein, half DM-RS shows that the running time-frequency resource of port 9 and port 10 correspondences is not taken by DM-RS, and full DM-RS shows that the running time-frequency resource of port 9 and port 10 correspondences is taken by DM-RS.
Need to prove, above-mentioned corresponding relation needs base station and via node to make an appointment, so that via node is being received above-mentioned bit information, can know that the base station is information and the DM-RS occupation condition of the DM-RS port of this via node transmission number of plies of distributing, each layer correspondence.
The embodiment of the invention reduces the method for transmission interlayer interference in the MU-MIMO system, the situation that DM-RS is only arranged in the 1st time slot for 1 subframe, adopt MU-MIMO to serve a plurality of users, four quadrature DM-RS ports are provided, thereby can be in the total number of plies of MU-MIMO greater than 2 o'clock, Effective Raise improves the performance of MU-MIMO based on the precision of the channel estimating of DM-RS.
Need to prove, disturb to improve the quality of channel estimating for guaranteeing DM-RS not to be caused, the base station guarantees not send data on the running time-frequency resource that DM-RS takies when sending data.Therefore, when the relaying node only takies port 7 or port 8 or takies simultaneously port 7 and port 8, whether the base station needs explicitly to notify this via node to be taken by DM-RS on the running time-frequency resource position of port 9 and port 10 correspondences, thereby allow via node know whether oneself has data in this running time-frequency resource position, because if port 9 and/or port 10 do not distribute to other via nodes, that is to say, the running time-frequency resource of port 9 and/or port 10 correspondences is not taken by DM-RS, and then the base station can send data by corresponding running time-frequency resource in the corresponding port.Usually, because the base station is when distributing above-mentioned four ports, can distribute successively port 7, port 8, port 9, port 10, and therefore when the base station was notified certain via node only to take port 9 or port 10 or taken simultaneously port 9 and 10, then this via node can know implicitly that the running time-frequency resource of port 7 and port 8 correspondences is taken by DM-RS.
The method that the embodiment of the invention reduces transmission interlayer interference in the MU-MIMO system is applicable to wireless communication system, LTE-Advanced relay system particularly, and the below is described in further details as example to be applied to the LTE-Advanced relay system.
Below the embodiment of the invention for durther example details reduce the concrete application of the method for transmission interlayer interference in the MU-MIMO system.
Base station hypothesis LTE-Advanced system adopts two via nodes of MU-MIMO service, the number of plies of each via node is 1, then can notify " 1 layer; port 7; half DM-RS " to one of them via node, " 1 layer, port 8; half DM-RS " gives another via node, and wherein half DM-RS shows that the running time-frequency resource of port 9 and port 10 correspondences is not taken by DM-RS.
Base station hypothesis LTE-Advanced system adopts two via nodes of MU-MIMO service, the number of plies of one of them via node is 1, the number of plies of another via node is 2, then can notify " 2 layers; ports7-8, full DM-RS " to one of them via node, " 1 layer; port 9 " gives another via node, and wherein full DM-RS shows that the running time-frequency resource of port 9 and port 10 correspondences is taken by DM-RS.
Suppose that the LTE-Advanced system adopts two via nodes of MU-MIMO service, the number of plies of two via nodes is 2, then can notify " 2 layers; ports 7-8; full DM-RS " to one of them via node, and " 2 layers, ports 9-10 " gives another via node.
Suppose that the LTE-Advanced system adopts three via nodes of MU-MIMO service, the number of plies of each via node is 1, then can notify " 1 layer; port 7, full DM-RS " to the 1st via node, " 1layer; port 8; full DM-RS " gives the 2nd via node, and " 1 layer, port 9 " gives the 3rd via node.
Suppose that the LTE-Advanced system adopts three via nodes of MU-MIMO service, wherein the number of plies of two via nodes is 1, the number of plies of another via node is 2, then can notify " 1 layer, port 7; full DM-RS " to first via node, " 1 layer, port 8, full DM-RS " gives second via node, " 2 layers, port 9-10 " gives the 3rd via node.
Suppose that the LTE-Advanced system adopts four via nodes of MU-MIMO service, the number of plies of each via node is 1, then can notify " 1 layer, port 7; full DM-RS " to first via node, " 1layer, port 8, full DM-RS " gives second via node, " 1 layer; port 9 " gives the 3rd via node, and " 1 layer, port 10 " gives the 4th via node.
The concrete advice method of above-mentioned various situations can adopt the mode of front table 3.
Correspondingly, the embodiment of the invention also provides the equipment of transmission interlayer interference in a kind of MU-MIMO of the reduction system, as shown in Figure 7, is a kind of structural representation of this equipment.
In this embodiment, described equipment comprises:
Setting unit 701 is used to multiuser MIMO that four quadrature DM-RS ports are set, and is respectively: port 7, port 8, port 9 and port 10.
Above-mentioned four quadrature DM-RS ports adopt the CDM+FDM multiplex mode, and wherein, port 7 and port8 take identical running time-frequency resource and be that 2 OCC distinguishes by the length in the table 1; Similarly, port 9 and port 10 take identical running time-frequency resource and are that 2 OCC distinguishes by length in the table 1.Distinguish by frequency resource between port 7, port 8 and port 9, the port 10, namely port 7, port 8 take respectively different frequency resources from port 9, port 10.
Allocation units 702, the DM-RS port that is used to via node to distribute the above-mentioned setting unit 701 of the transmission number of plies and each layer correspondence to arrange.
Being different via node when distributing the DM-RS port, can distribute successively according to the order of port 7, port 8, port 9, port 10.
Notification unit 703, information and the corresponding bit information of DM-RS occupation condition of the transmission number of plies that is used for above-mentioned allocation units 702 are distributed, the DM-RS port of each layer correspondence are notified described via node.Particularly, notification unit 703 can be notified by descending control signaling information and the corresponding bit information of DM-RS occupation condition of the DM-RS port of the transmission number of plies that above-mentioned allocation units 701 distribute, each layer correspondence.
Transmitting element 704, running time-frequency resource corresponding to DM-RS port that is used for using allocation units 702 to distribute sends dedicated pilot signal to described via node; Other running time-frequency resources outside resource corresponding to the DM-RS port that uses allocation units 702 to distribute send data to described via node.
Need to prove, disturb to improve the quality of channel estimating for guaranteeing DM-RS not to be caused, described equipment need to guarantee not send data on the running time-frequency resource that DM-RS takies when sending data.Therefore, when the DM-RS port-for-port 7 that distributes for via node when allocation units 702 or port 8 or port 7 and port 8, whether notification unit 703 also needs to notify the running time-frequency resource of described via node port 9 and port one 0 correspondence to be taken by DM-RS.Because allocation units 702 can distribute successively according to the order of port 7, port 8, port 9, port 10 when be different via node distribution DM-RS port.Therefore, if the DM-RS port that allocation units 702 distribute for above-mentioned via node is port 9 or port10 or port 9 and 10 o'clock, described via node can know implicitly that the running time-frequency resource of port 7 and port 8 correspondences is taken by DM-RS, in this case, whether notification unit 703 also can notify the running time-frequency resource of described via node port 7 and port 8 correspondences to be taken by DM-RS.
In another embodiment of the present invention, above-mentioned setting unit 701 also is used for arranging the number of plies of scheduling, the port numbers of distribution and the corresponding relation that the DM-RS running time-frequency resource takies situation, every kind of corresponding relation represents with a bit value, and described DM-RS running time-frequency resource takies situation and represents with half DM-RS or full DM-RS.
In this case, if the DM-RS port-for-port 7 that above-mentioned allocation units 702 distribute is or/and port 8, the running time-frequency resource of port 9 and port one 0 correspondence is taken by DM-RS, and then notification unit 703 is notified the described via node number of plies, port numbers, the corresponding bit information of full DM-RS; If the DM-RS port-for-port 7 that above-mentioned allocation units 702 distribute is or/and port 8, the running time-frequency resource of port 9 and port one 0 correspondence is not taken by DM-RS, and then notification unit 703 is notified the described via node number of plies, port numbers, the corresponding bit information of half DM-RS.
The embodiment of the invention reduces the equipment of transmission interlayer interference in the MU-MIMO system, can be used as the part of base station, the situation that DM-RS is only arranged in the 1st time slot for 1 subframe, adopt MU-MIMO to serve a plurality of users, four quadrature DM-RS ports are provided, thereby can be in the total number of plies of MU-MIMO greater than 2 o'clock, Effective Raise improves the performance of MU-MIMO based on the precision of the channel estimating of DM-RS.
Correspondingly, the present invention executes example and also provides in a kind of reduction MU-MIMO system and transmit interlayer interference, as shown in Figure 8, is the flow chart of the method, may further comprise the steps:
Step 801, information and the corresponding bit information of DM-RS occupation condition of the transmission number of plies of via node reception base station assigns, the DM-RS port of each layer correspondence, described DM-RS port-for-port 7, port 8, port 9 and/or port one 0.
Above-mentioned port 7 takies identical running time-frequency resource with port 8, and is 2 quadrature mask differentiation by length; Port 9 takies identical running time-frequency resource with port one 0, and is 2 quadrature mask differentiation by length; Port 7, port 8 take respectively different frequency resources from port 9, port one 0.
Particularly, above-mentioned via node can obtain above-mentioned information by the descending control signaling that the base station sends.
Step 802, above-mentioned via node receives dedicated pilot signal, and described dedicated pilot signal is that described base station sends by running time-frequency resource corresponding to the DM-RS port of described distribution.
Step 803, above-mentioned via node receive data, described data are that other running time-frequency resources outside resource corresponding to the DM-RS port of base station use distribution send.
Correspondingly, the embodiment of the invention also provides the equipment of transmission interlayer interference in a kind of MU-MIMO of the reduction system, and this equipment comprises:
Receiving element be used for to receive information and the corresponding bit information of DM-RS occupation condition of DM-RS port of the transmission number of plies, each layer correspondence of base station assigns, described DM-RS port-for-port 7, port 8, port 9 and/or port one 0; And reception dedicated pilot signal, described dedicated pilot signal is that described base station sends by running time-frequency resource corresponding to the DM-RS port of described distribution, and receive data, described data are that other running time-frequency resources outside resource corresponding to the DM-RS port of base station use distribution send.
Above-mentioned port 7 takies identical running time-frequency resource with port 8, and is 2 quadrature mask differentiation by length; Port 9 takies identical running time-frequency resource with port one 0, and is 2 quadrature mask differentiation by length; Port 7, port 8 take respectively different frequency resources from port 9, port one 0.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and identical similar part is mutually referring to getting final product between each embodiment, and each embodiment stresses is difference with other embodiment.Especially, for apparatus embodiments, because its basic simlarity is in embodiment of the method, so describe fairly simplely, relevant part gets final product referring to the part explanation of embodiment of the method.System embodiment described above only is schematic, wherein said unit as the separating component explanation can or can not be physically to separate also, the parts that show as the unit can be or can not be physical locations also, namely can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select according to the actual needs wherein some or all of module to realize the purpose of the present embodiment scheme.Those of ordinary skills namely can understand and implement in the situation that do not pay creative work.
Above the embodiment of the invention is described in detail, has used embodiment herein the present invention is set forth, the explanation of above embodiment just is used for helping to understand method and apparatus of the present invention; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (13)
1. a method that reduces transmission interlayer interference in the multi-user MIMO system is characterized in that, comprising:
The base station is that multiuser MIMO arranges four quadrature DM-RS ports, is respectively: port 7, port 8, port 9 and port one 0;
The DM-RS port that distributes the transmission number of plies and each layer correspondence for via node;
Notify described via node with information and the corresponding bit information of DM-RS occupation condition of the DM-RS port of the transmission number of plies of distributing, each layer correspondence;
Use running time-frequency resource corresponding to DM-RS port that distributes to send dedicated pilot signal to described via node;
Other running time-frequency resources outside resource corresponding to the DM-RS port that use to distribute send data to described via node.
2. method according to claim 1 is characterized in that, described four quadrature DM-RS ports adopt code division multiplexing and frequency division multiplexing, wherein:
Port 7 takies identical running time-frequency resource with port 8, and is 2 quadrature mask differentiation by length;
Port 9 takies identical running time-frequency resource with port one 0, and is 2 quadrature mask differentiation by length;
Port 7, port 8 take respectively different frequency resources from port 9, port one 0.
3. method according to claim 1 is characterized in that, the information of the DM-RS port of the described transmission number of plies that will distribute and each layer correspondence notifies described via node to comprise:
Information and the corresponding bit information of DM-RS occupation condition of DM-RS port of the transmission number of plies, each layer correspondence of described base station assigns notified in described base station by descending control signaling.
4. according to claim 1 to 3 each described methods, it is characterized in that, described method also comprises:
The base station arranges the number of plies of scheduling, the port numbers of distribution and the corresponding relation that the DM-RS running time-frequency resource takies situation, and every kind of corresponding relation represents with a bit value, and described DM-RS running time-frequency resource takies situation and represents with halfDM-RS or full DM-RS;
Notify described via node to comprise information and the corresponding bit information of occupation condition of the DM-RS port of the transmission number of plies of distributing, each layer correspondence:
The base station is the DM-RS port-for-port 7 that distributes of via node or/and port 8, if the running time-frequency resource of port 9 and port one 0 correspondence is taken by DM-RS, then the described via node number of plies, port numbers, the corresponding bit information of full DM-RS are notified in the base station;
The base station is the DM-RS port-for-port 7 that distributes of via node or/and port 8, if the running time-frequency resource of port 9 and port one 0 correspondence is not taken by DM-RS, then the described via node number of plies, port numbers, the corresponding bit information of half DM-RS are notified in the base station.
5. a method that reduces transmission interlayer interference in the multi-user MIMO system is characterized in that, comprising:
Information and the corresponding bit information of DM-RS occupation condition of the transmission number of plies of via node reception base station assigns, the DM-RS port of each layer correspondence, described DM-RS port-for-port 7, port 8, port 9 and/or port one 0;
Described via node receives dedicated pilot signal, and described dedicated pilot signal is that described base station sends by running time-frequency resource corresponding to the DM-RS port of described distribution;
Described via node receive data, described data are that other running time-frequency resources outside resource corresponding to the DM-RS port of base station use distribution send.
6. method according to claim 5 is characterized in that:
Port 7 takies identical running time-frequency resource with port 8, and is 2 quadrature mask differentiation by length;
Port 9 takies identical running time-frequency resource with port one 0, and is 2 quadrature mask differentiation by length;
Port 7, port 8 take respectively different frequency resources from port 9, port one 0.
7. method according to claim 5 is characterized in that, information and the corresponding bit information of DM-RS occupation condition of the transmission number of plies of described via node reception base station assigns, the DM-RS port of each layer correspondence comprise:
Described via node receives the transmission number of plies, each layer correspondence of described base station assigns are notified in described base station by descending control signaling information and the corresponding bit information of DM-RS occupation condition of DM-RS port.
8. an equipment that reduces transmission interlayer interference in the multi-user MIMO system is characterized in that, comprising:
Setting unit is used to multiuser MIMO that four quadrature DM-RS ports are set, and is respectively: port 7, port 8, port 9 and port one 0;
Allocation units, the DM-RS port that is used to via node to distribute the described setting unit of the transmission number of plies and each layer correspondence to arrange;
Notification unit is used for distributing information and the corresponding bit information of DM-RS occupation condition of the DM-RS port of the transmission number of plies, each layer correspondence to notify described via node described allocation units;
Transmitting element, running time-frequency resource corresponding to DM-RS port that is used for using described allocation units to distribute sends dedicated pilot signal to described via node, and other running time-frequency resources outside resource corresponding to the DM-RS port that uses described allocation units to distribute send data to described via node.
9. equipment according to claim 8 is characterized in that, four quadrature DM-RS ports that described setting unit arranges adopt code division multiplexing and frequency division multiplexing, wherein:
Port 7 takies identical running time-frequency resource with port 8, and is 2 quadrature mask differentiation by length;
Port 9 takies identical running time-frequency resource with port one 0, and is 2 quadrature mask differentiation by length;
Port 7, port 8 take respectively different frequency resources from port 9, port one 0.
10. equipment according to claim 8 is characterized in that,
Described notification unit, concrete information and the corresponding bit information of DM-RS occupation condition that is used for notifying by descending control signaling the DM-RS port of the transmission number of plies that described allocation units distribute, each layer correspondence.
11. to 10 each described equipment, it is characterized in that according to claim 8,
Described setting unit also is used for arranging the number of plies of scheduling, the port numbers of distribution and the corresponding relation that the DM-RS running time-frequency resource takies situation, every kind of corresponding relation represents with a bit value, and described DM-RS running time-frequency resource takies situation and represents with halfDM-RS or full DM-RS;
If the DM-RS port-for-port 7 that described allocation units distribute is or/and port 8, the running time-frequency resource of port 9 and port one 0 correspondence is taken by DM-RS, and then described notification unit is notified the described via node number of plies, port numbers, the corresponding bit information of full DM-RS;
If the DM-RS port-for-port 7 that described allocation units distribute is or/and port 8, the running time-frequency resource of port 9 and port one 0 correspondence is not taken by DM-RS, and then described notification unit is notified the described via node number of plies, port numbers, the corresponding bit information of half DM-RS.
12. an equipment that reduces transmission interlayer interference in the multi-user MIMO system is characterized in that, comprising:
Receiving element be used for to receive information and the corresponding bit information of DM-RS occupation condition of DM-RS port of the transmission number of plies, each layer correspondence of base station assigns, described DM-RS port-for-port 7, port 8, port 9 and/or port one 0; And reception dedicated pilot signal, described dedicated pilot signal is that described base station sends by running time-frequency resource corresponding to the DM-RS port of described distribution, and receive data, described data are that other running time-frequency resources outside resource corresponding to the DM-RS port of base station use distribution send.
13. equipment according to claim 12 is characterized in that, described port 7 takies identical running time-frequency resource with port 8, and is 2 quadrature mask differentiation by length; Port 9 takies identical running time-frequency resource with port one 0, and is 2 quadrature mask differentiation by length; Port 7, port 8 take respectively different frequency resources from port 9, port one 0.
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| CN2011101945442A CN102882566A (en) | 2011-07-12 | 2011-07-12 | Method and equipment for reducing transmission interlamination interference in multi-user MIMO (Multiple Input Multiple Output) system |
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| CN2011101945442A CN102882566A (en) | 2011-07-12 | 2011-07-12 | Method and equipment for reducing transmission interlamination interference in multi-user MIMO (Multiple Input Multiple Output) system |
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