CN101932073A - Method for sending and receiving DRS (Dedicated Reference Signal), base station and user equipment - Google Patents
Method for sending and receiving DRS (Dedicated Reference Signal), base station and user equipment Download PDFInfo
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Abstract
The invention provides a method for sending and receiving a DRS (Dedicated Reference Signal), a base station and user equipment (UE). Aiming at a physical resource block distributed by the base station to the UE, the base station distributes DRS patterns which correspond to downlink data of various links to the UE so that information of the DRS patterns distributed to the UE and DRS-RE information distributed for transmitting the DRS can be sent to the UE; according to the information of the DRS patterns distributed to the UE, the base station sends the DRS to the UE, but does not send downlink data on the DRS-RE which is distributed for transmitting the DRS, wherein the DRS patterns are position information of the DRS on a time-frequency resource, or the combination of position information and extended code information; and the DRS patterns which correspond to the downlink data of various links of various UE are all different. By adopting the invention, the DRS for various UE can be transmitted in the multi-user multi-input multi-output technology so that various UE can accurately demodulate the downlink data.
Description
Technical Field
The present invention relates to the field of mobile communication technologies, and in particular, to a method, a base station, and a user terminal for transmitting and receiving a dedicated reference signal.
Background
In an enhanced long term evolution (LTE-a) system, in order to support higher peak speed, each cell may be configured with multiple transmit antennas, for example, 8 transmit antennas, and meanwhile, in order to reduce overhead of pilot signals, a user terminal (UE) demodulates downlink data using a Dedicated Reference Signal (DRS) transmitted by a base station. When the base station transmits the DRS, the base station transmits the DRS for each path of data of the UE, that is, each data stream, and the UE performs demodulation processing on the corresponding path of data after receiving each DRS.
As shown in fig. 1, in one Physical Resource Block (PRB), Resource Elements (REs) for DRSs are divided into two groups in a Frequency Division Multiplexing (FDM) manner, wherein the REs for DRSs are referred to as DRS REs, the REs denoted by reference numeral 1 in fig. 1 are first groups of DRS REs, the REs denoted by reference numeral 2 are second groups of DRS REs, other REs can be used for common reference signals, control signaling and data transmission, and the DRSs for multiplexing data can be multiplexed by Code Division Multiplexing (CDM) on each group of DRS REs. The method specifically comprises the following steps: for single stream data transmission, the DRS of the UE only occupies one set of DRS REs for transmission, and another set of DRS REs may be used for data transmission. For dual-stream data transmission, DRSs still only occupy one set of DRS REs for transmission and are multiplexed by CDM, and another set of DRS REs may be used for data transmission. And for transmission of the N-path data streams, where N is greater than or equal to 3, DRSs are transmitted on two groups of DRS REs, where DRSs corresponding to a part of data streams are transmitted on a first group of DRS REs by CDM, and DRSs corresponding to another part of data streams are transmitted on a second group of DRS REs by CDM, where the number of paths of DRSs transmitted on the first group of DRS REs and the number of paths of DRSs transmitted on the second group of DRSREs are both performed according to the number of paths specified by the protocol.
The above processes are all for single-user Multiple Input Multiple Output (MIMO), and the base station and the UE only need to transmit and receive DRSs on fixed DRS REs according to the number of downlink data paths on pre-determined DRS REs. However, for multi-user MIMO (MU-MIMO), multiple users for MU-MIMO may use the same PRB at the same time, and the DRSs of each user cannot be distinguished according to the above method, so that each user cannot accurately demodulate downlink data.
Disclosure of Invention
In view of this, the present invention provides a method, a base station, and a UE for sending and receiving a DRS, so as to implement DRS transmission for each UE in an MU-MIMO technology, so that each UE can accurately demodulate downlink data.
A method of transmitting DRS, the method comprising:
aiming at a physical resource block PRB allocated by a base station to a user terminal UE, the base station allocates DRS patterns corresponding to downlink data of each path for the UE, and transmits DRS pattern information allocated to the UE and DRS resource unit RE information allocated for transmitting DRS to the UE;
the base station sends DRS to the UE according to the DRS pattern information distributed to the UE, and does not send downlink data on the DRS RE distributed for transmitting the DRS;
the DRS patterns are location information of DRS on time-frequency resources, or a combination of the location information and spreading code information, and DRS patterns corresponding to each downlink data of each UE are different.
A method of receiving a DRS, the method comprising:
the method comprises the steps that UE receives DRS pattern information corresponding to downlink data of each path distributed by a base station for the UE and DRS RE information distributed for transmitting DRS in PRB distributed for the UE, does not receive the downlink data on DRS REs distributed for transmitting DRS, and demodulates the downlink data of each path according to the DRS pattern information;
the DRS pattern is position information of the DRS on time-frequency resources, or combination of the position information and spreading code information.
A base station, the base station comprising: the device comprises a pattern allocation unit, a signaling sending unit and a signal sending unit;
the pattern allocation unit is configured to allocate, for a PRB allocated for a UE, a DRS pattern corresponding to each downlink data path for the UE;
the signaling sending unit is configured to send DRS pattern information allocated to the UE and DRS RE information allocated to transmit DRS in a PRB allocated to the UE;
the signal transmitting unit is configured to transmit DRSs to the UE according to pattern information allocated to the UE, and not transmit downlink data on the DRS REs allocated for transmission of DRSs;
the DRS patterns are location information of DRS on time-frequency resources, or a combination of the location information and spreading code information, and DRS patterns corresponding to each downlink data of each UE are different.
A UE, comprising: a signaling receiving unit and a data receiving unit;
the signaling receiving unit is configured to receive DRS pattern information corresponding to each path of downlink data allocated by the base station to the UE and DRS RE information allocated to transmit DRS in a PRB allocated to the UE;
the data receiving unit is configured to not receive downlink data on the DRS REs allocated for transmission of the DRS, and demodulate each received downlink data according to the DRS pattern information;
the DRS pattern is position information of the DRS on time-frequency resources, or combination of the position information and spreading code information.
According to the technical scheme, the base station distributes different DRS patterns for each path of downlink data of each UE in the PRB, and sends DRS pattern information corresponding to each path of downlink data distributed for the UE to the UE, so that the UE can demodulate each path of downlink data according to the DRS pattern information; in addition, the base station does not send downlink data on the DRS REs allocated for transmission of the DRS, and also sends DRS RE information allocated for transmission of the DRS in the PRB to the UE, so that the UE does not receive downlink data on the DRS REs allocated for transmission of the DRS, thereby avoiding transmission collision and ensuring normal transmission of the DRS. Therefore, the invention can realize DRS transmission aiming at each UE in MU-MIMO technology, so that each UE can accurately demodulate the downlink data.
Drawings
Fig. 1 is a schematic diagram of DRS REs on one PRB;
fig. 2 is a schematic diagram of a first PDCCH structure according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a second PDCCH structure according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a third PDCCH structure according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a fourth PDCCH structure according to an embodiment of the present invention;
fig. 6 is a structural diagram of a base station according to an embodiment of the present invention;
fig. 7 is a structure diagram of a UE according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The method provided by the invention mainly comprises the following steps: aiming at a PRB allocated to the UE by a base station, the base station allocates a DRS pattern corresponding to each path of downlink data for the UE, and transmits DRS pattern information allocated to the UE and DRS RE information allocated for transmitting DRS to the UE; the base station transmits DRS to the UE according to the DRS pattern information allocated to the UE, and does not transmit downlink data on DRS RE allocated for transmitting the DRS; the DRS patterns are location information of DRS on time-frequency resources, or a combination of the location information and spreading code information, and DRS patterns corresponding to each downlink data of each UE are different.
Accordingly, the UE receives DRS pattern information transmitted by the base station, receives a DRS using the DRS pattern information so as to perform demodulation of downlink data, and does not perform downlink data reception on DRS REs allocated for transmission of the DRS.
For MU-MIMO, multiple downlink data of multiple UEs may be transmitted on one PRB, each downlink data corresponds to one DRS, and different DRS patterns need to be defined to distinguish DRSs of each UE. Preferably, in order to obtain better channel estimation performance, the DRS patterns are orthogonal to each other.
In addition, the multiplexing of the DRS patterns to the time-frequency resources can adopt a CDM mode, that is, the time-frequency resources corresponding to the DRS patterns occupy the same REs; the method may also adopt FDM, Time Division Multiplexing (TDM), or at least two of CDM, FDM, and TDM in combination, and at this time, the time-frequency resource corresponding to each DRS pattern may occupy different REs. When the multiplexing of each DRS pattern to the time-frequency resources can adopt a CDM mode, or a combination of CDM and other modes, the DRS pattern reflects the combination of the position information of the DRS on the time-frequency resources and spreading code information; if the multiplexing of the DRS pattern on the time-frequency resources adopts TDM, FDM or TDM and FDM combined mode, the DRS pattern reflects the position information of the DRS on the time-frequency resources.
The invention mainly relates to the following modes: each DRS pattern adopts an FDM mode, a TDM mode or a mode combining at least two modes of CDM, FDM and TDM. Because each UE may adopt different DRS REs, assuming that there are two UEs, a first UE adopts a first group of DRS REs, and a second UE adopts a second group of DRS REs, in order to avoid data transmission by the first UE on the second group of DRS REs, the base station needs to transmit RE information allocated for transmission of DRS in a PRB allocated to the UE, and the base station cannot perform downlink data transmission on the DRS REs, and accordingly, the UE cannot perform downlink data reception on the DRS REs.
The DRS pattern information transmitted by the base station may be index information for transmitting a DRS pattern. The base station and the terminal can pre-store the corresponding relation between the indexes of the DRS patterns and the DRS patterns, and the base station acquires the indexes of the DRS patterns corresponding to the determined DRS patterns according to the corresponding relation and sends the index information of the DRS patterns to the UE; correspondingly, after receiving the index information of the DRS pattern, the UE determines DRS pattern information corresponding to the index of the DRS pattern according to the corresponding relationship, thereby receiving the DRS.
In addition, DRS RE information used in a PRB allocated to the UE and transmitted by the base station may take the following four forms:
in a first form: and transmitting indication information of a DRS RE group used for transmitting the DRS in the PRB allocated to the UE. For example, the indication information is a bitmap; if the base station determines that all DRSs of all the UEs in the PRB allocated to the UE are transmitted on the first group of DRS REs, setting bits corresponding to the first group of DRS REs in the indication information sent to the UE, and enabling the UE to use the second group of DRSREs for data transmission; if the base station determines that all DRSs of all the UEs in the PRB allocated to the UE are transmitted on two groups of DRS REs, bit positions corresponding to the first group of DRS REs and the second group of DRS REs are simultaneously set in indication information sent to the UE, and the UE cannot transmit data on the two groups of DRS REs.
In a second form: and transmitting the number L of DRS RE groups used for transmitting the DRS in the PRB allocated to the UE. The base station and the UE may agree on a usage order of each DRS RE group, where the agreed usage order may be a fixed order, or may determine the usage order of each DRS RE according to a preset policy, and the UE may determine that all L DRS RE groups according to the usage order are DRSRE groups for transmitting DRSs. For example, 1-bit signaling may be adopted to indicate the number of DRS RE groups for transmitting DRSs, where 0 indicates that the number of DRS RE groups for transmitting DRSs is 1, and if the agreed usage order is from the first DRS RE group, the DRS REs for transmitting DRSs are determined to be the first DRS RE group, and 1 indicates that the number of DRS RE groups for transmitting DRSs is 2, then both sets of DRS REs are determined to be used for transmitting DRSs. The shapeIn the formula, determining the use order of the DRS REs according to a preset policy may specifically be: the use order of each DRS RE is determined according to the corresponding relationship between the preset parameters and the use order, for example, mod (Cell _ ID, 2) may be determined as the DRS RE group to be used first with the Cell identifier Cell _ ID as a parameter. When the second form is used, the number of signalling bits required is
Wherein P is the maximum number of DRS RE groups,indicating rounding up.
In a third form: and sending the total number M of all DRS patterns distributed in the PRB distributed for the UE. The base station and the UE may agree a usage order of each DRS pattern and a mapping relationship between each DRS pattern and a DRS RE group, the base station sends a total number M of DRS patterns allocated in a PRB allocated to the UE, and accordingly, after the UE acquires the total number of the allocated DRS patterns, the UE determines DRS RE information for transmitting DRSs in the PRB allocated to the UE according to the agreed usage order of each DRS pattern and the mapping relationship between each DRS pattern and the DRS RE group. For example, assuming that a use order of 4 DRS patterns is predefined, and the first 2 DRS patterns are mapped to a first group of DRS REs, and the last 2 DRS patterns are mapped to a second group of DRS REs, if a total number of DRS patterns allocated in a PRB allocated for a UE is 2 or less, it is assumed that a DRS RE group for transmitting DRS in the PRB is only the first group, and if a total number of DRS patterns allocated in a PRB allocated for the UE is 3 or more, it is assumed that a DRS RE group for transmitting DRS in the PRB is the first group and the second group. It should be noted that, when the value of the total number M of all DRS patterns allocated to the PRB allocated for the UE is greater than or equal to the number of DRS patterns currently and actually used by one PRB, for example, when the total number of DRS patterns allocated to the PRB allocated for the UE is 3, the base station may actually use 2 patterns to schedule two MU-MIMO UEs with single data stream, and the DRS of each UE is mapped onto a different set of DRS REs, so as to enhance the performance of channel estimation. When the third form is used, the number of signalling bits required isWherein Q is the maximum number of DRS patterns,indicating rounding up.
A fourth form: and sending the number of DRS patterns distributed in each DRS RE group in the PRB distributed for the UE. Correspondingly, after acquiring the number of used DRS patterns in each DRS RE group, the UE determines DRS RE information used by the PRB for transmitting the DRS. If the number of the DRS patterns used in one DRS RE group is 0, the DRS RE group is not used for transmitting DRS; and if the number of the DRS patterns used in one DRS RE group is more than 0, representing that the DRS RE group is used for transmitting DRS.
It should be noted that the number of DRS patterns allocated in one DRS RE group of the PRB allocated for the UE is greater than or equal to the number of DRS patterns currently and actually used by the one DRS RE group in one PRB. The information of the number of DRS patterns allocated to each set of DRS REs may be encoded and independently transmitted, or jointly encoded to compress signaling overhead.
In order to further optimize the performance of MU-MIMO, the UE may further acquire patterns allocated to other UEs in the PRB, in addition to acquiring the DRS pattern allocated to itself, so as to perform channel estimation and interference suppression processing.
The following two ways to obtain the patterns allocated to other UEs in the PRB can be adopted:
the first mode is as follows: if the using order of the DRS patterns is agreed in advance, the base station may further send the total number of DRS patterns used in the PRBs allocated for the UE to the UE. The UE can know which DRS patterns are allocated to other UEs by using the total number of DRS patterns used in the PRB allocated for the UE and the DRS pattern allocated to the UE, so as to know resources used by the other UEs to receive the DRS, and perform channel estimation and interference suppression processing.
The second mode is as follows: the base station respectively sends the number of the DRS patterns used in each DRS RE group, and after the UE obtains the number of the DRS patterns used in each DRS RE group in the PRB allocated to the UE, the UE can know which DRS patterns are allocated to other UEs according to the DRS patterns allocated to the UE by the base station, so that the resources used by the other UEs for receiving the DRS are known, and channel estimation and interference suppression processing are carried out.
When the two manners of acquiring the patterns allocated to other UEs are described above, the set of DRS patterns used in the PRB allocated by the UE is P, and after the UE acquires the number of total DRS patterns used in each DRS RE group, if the set of DRS patterns allocated to the UE is P ', the UE may know that the DRS patterns allocated to other UEs necessarily belong to the set P-P ', and may detect the strength of the signal of the DRS pattern in the set P-P ', and when the strength exceeds a certain threshold, the UE considers that the DRS pattern exists, and performs channel estimation and interference suppression processing according to the resource used by the DRS.
As shown in fig. 2, in the drawing, DRS _ idx field carries index information of DRS pattern allocated to the UE, and DRS _ RE _ tot field carries DRS RE information allocated to transmit DRS.
In addition, the total number of DRS patterns allocated for the above PRB may also be sent through a PDCCH, as shown in fig. 3, where an N _ DRS field in the figure carries the total number of DRS patterns.
DRS RE information used in a PRB allocated for a UE or the total number of all DRS patterns allocated may also be sent through higher layer signaling, and in this case, DRS pattern information allocated to the UE may be sent only in a PDCCH, as shown in fig. 4. DRS pattern information allocated to the UE and the total number of all DRS patterns allocated in the PRB may also be transmitted in the PDCCH, as shown in fig. 5.
If the DRS pattern information allocated to the UE, the DRS RE information allocated in the PRB and used for transmitting the DRS, and the total number of all DRS patterns allocated in the PRB allocated for the UE are all transmitted through the PDCCH, the base station may perform joint coding on the information, so as to reduce signaling bit overhead.
In order to randomize interference of DRSs between neighboring cells or different UEs, a base station may average DRS RE groups mapped by DRS patterns allocated to UEs on the same PRB. For example, there are 2 UEs on the PRB, and downlink data of both the two UEs are 3 paths, then, in 3 DRS patterns of one UE, DRS patterns mapped to the DRS REs in the first group are 1 less than those mapped to the DRS REs in the second group, and in 3 DRS patterns allocated to another UE, DRS patterns mapped to the DRS REs in the second group are 1 less than those mapped to the DRS REs in the first group, so that DRSs transmitted on two groups of DRSREs are averaged, and mutual interference is also averaged.
After the averaged allocation, the base station may send, to the UE, a mapping relationship between each DRS pattern allocated to the UE and the DRS RE group, where the mapping relationship may also be sent through the PDCCH. For example, the mapping relationship may be carried in 1 bit in the PDCCH, and when the number of downlink data paths of the UE is 1 or 2, 0 is carried in the 1 bit to indicate that the first group of DRS REs is used, and 1 is carried to indicate that the second group of DRS REs is used; when the number of downlink data paths of the UE is more than 3 and is an odd number, carrying 0 in the 1 bit indicates that the DRS patterns mapped by the first group of DRS REs are 1 less than the DRS patterns mapped by the second group of DRS REs, and carrying 1 indicates that the DRS patterns mapped by the second group of DRS REs are 1 less than the DRS patterns mapped by the first group of DRS REs. This information indicating the mapping relationship of the DRS patterns of the UE to the DRS RE groups may be jointly encoded with other signaling bits.
The base station and the UE may adopt a predetermined mapping relationship, and the base station averages the DRS patterns of each UE mapped on each DRS RE group according to the predetermined mapping relationship, and sends the distributed DRS pattern information to the UE.
The base station and the UE may also determine a mapping relationship between each DRS pattern and the DRSRE group according to a predetermined parameter policy, where the parameter policy may be a policy determined according to a cell identifier, a user identifier, or a slot number. Taking the Cell identifier as an example, for a UE whose Cell identifier is Cell _ ID, when the number of downlink data paths of the UE is 1 or 2, a DRS RE group with a frequency offset mod (Cell _ ID, 2) is used. When the number of downlink data paths of the UE is 3 or more and an odd number, DRS patterns mapped to DRS RE groups with a frequency offset of mod (Cell _ ID, 2) are 1 less than DRS patterns mapped to DRS RE groups with a frequency offset of mod (mod (Cell _ ID, 2) +1, 2).
The above is a detailed description of the method provided by the present invention, and the following is a detailed description of the base station and the UE provided by the present invention.
Fig. 6 is a structural diagram of a base station according to an embodiment of the present invention, and as shown in fig. 6, the base station may include: pattern allocation section 601, signaling transmission section 602, and signal transmission section 603.
A pattern allocating unit 601, configured to allocate, to a PRB allocated to a UE, a DRS pattern corresponding to each downlink data for the UE.
A signaling sending unit 602, configured to send DRS pattern information allocated to the UE and DRS RE information allocated to transmit DRS in a PRB allocated to the UE.
A signal transmitting unit 603, configured to transmit DRSs to the UE according to the pattern information allocated to the UE, and not transmit downlink data on DRS REs allocated for transmission of the DRSs.
The DRS patterns are location information of DRS on time-frequency resources, or a combination of the location information and spreading code information, and DRS patterns corresponding to each downlink data of each UE are different.
Specifically, the signaling sending unit 602 may send, to the UE, a DRS pattern index corresponding to the DRS pattern allocated to the UE according to a correspondence relationship between the DRS pattern and the DRS pattern index predefined by the UE.
In addition, DRS REs may be pre-divided into K groups, where K is an integer greater than 1.
At this time, signaling sending unit 602 may specifically send, to the UE, indication information of the DRS RE group allocated for transmission of the DRS; or, according to the use sequence of each DRS RE group agreed with the UE in advance, the number of DRS RE groups allocated for transmitting the DRS is sent to the UE; or, according to the use sequence of each DRS pattern agreed with the UE in advance and the mapping relationship between each DRS pattern and the DRS RE group, transmitting the total number of all DRS patterns allocated for the PRB to the UE; or, the number of DRS patterns allocated in each DRS RE group in the PRB is sent to the UE.
The signaling transmitting unit 602 may transmit DRS pattern information allocated to the UE through a PDCCH; DRS RE information to be allocated for transmission of the DRS is transmitted through a PDCCH or higher layer signaling.
Preferably, the signaling sending unit 602 may be further configured to send, according to a usage order of each DRS pattern predefined by the UE, a total number of all DRS patterns allocated for the PRB to the UE through PDCCH or high layer signaling; or, according to the use order of each DRS pattern agreed with the UE and the mapping relationship between each DRS pattern and the DRS RE group, sending the number of DRS patterns used in each DRS RE group to the UE.
In order to randomize interference between adjacent cells or UEs, when DRS patterns corresponding to each downlink data may be allocated to a UE, pattern allocating unit 601 averages the number of DRS patterns mapped on each DRS RE group, and notifies signaling transmitting unit 602 to transmit the mapping relationship from each DRS pattern allocated to the UE to the DRS RE group to the UE through a PDCCH; or, according to a parameter policy agreed in advance with the UE, determining a mapping relationship from each DRS pattern to the DRS RE group, and allocating a DRS pattern corresponding to each downlink data for the UE according to the mapping relationship; the parameter strategy enables DRS patterns of the UE mapped on each DRS RE group to be averaged.
Fig. 7 is a structure diagram of a UE according to an embodiment of the present invention, and as shown in fig. 7, the UE may include: a signaling receiving unit 701 and a data receiving unit 702.
A signaling receiving unit 701, configured to receive DRS pattern information corresponding to each downlink data allocated by the base station to the UE and DRS RE information allocated to transmit a DRS in a PRB allocated to the UE.
A data receiving unit 702, configured to not receive downlink data on the DRS REs allocated for transmitting the DRS, and demodulate each received downlink data according to the DRS pattern information.
The DRS pattern is position information of the DRS on time-frequency resources, or combination of the position information and spreading code information.
In addition, the UE may further include: a first pattern determination unit 703.
The signaling receiving unit 701 may receive a DRS pattern index transmitted by a base station.
The first pattern determining unit 703 may determine, according to a correspondence relationship between a DRS pattern and a DRS pattern index agreed in advance with the base station, a DRS pattern corresponding to the DRS pattern index received by the signaling receiving unit 701.
DRS REs may be pre-divided into K groups, where K is an integer greater than 1.
A signaling receiving unit 701 receives indication information of a DRS RE group allocated for transmission of DRS in the PRB; or receiving the number of DRS RE groups allocated for transmission of DRSs in the PRB; or receiving the total number of all DRS patterns allocated for the PRB; or receiving the number of DRS patterns distributed in each DRS RE group in the PRB.
At this time, the UE may further include: a first information determining unit 704 determines DRS RE groups allocated for transmission of DRSs in a current PRB according to a usage order of each DRS RE group pre-agreed with a base station and the number of DRS RE groups allocated for transmission of DRSs in the PRB; or determining, according to a use order of each DRS pattern predefined with the base station and a mapping relationship between each DRS pattern and a DRS RE group, a DRS RE group allocated for transmission of DRS in the PRB by using a total number of all DRS patterns allocated for the PRB; or determining the DRS RE groups allocated for transmission of DRSs in the PRB by using the number of DRS patterns allocated in each DRS RE group according to the use order of each DRS pattern agreed with the base station in advance and the mapping relationship between each DRS pattern and the DRS RE group.
Specifically, the signaling receiving unit 701 may receive DRS pattern information allocated to the UE through a PDCCH; and receiving DRSRE information allocated for transmission of the DRS in the PRB through PDCCH or high-layer signaling.
More preferably, the signaling receiving unit 701 may be further configured to receive, through PDCCH or higher layer signaling, a total number of all DRS patterns allocated for the PRB or a number of DRS patterns used in each DRS RE group.
At this time, the UE may further include: a second pattern determining unit 705, configured to determine DRS pattern information allocated to other UEs according to a usage order of DRS patterns predefined with the base station, a total number of all DRS patterns allocated for the PRB, and DRS pattern information allocated to the UE; or, determining DRS pattern information allocated to other UEs according to a use sequence of DRS patterns agreed with the base station in advance, the number of DRS patterns used in each DRS RE group, a mapping relationship between each DRS pattern and a DRS RE group, and DRS pattern information allocated to the UE.
In order to randomize interference between DRSs of neighboring cells or UEs, the signaling receiving unit 701 is further configured to receive, through the PDCCH, a mapping relationship between DRS patterns allocated to the UE and DRS RE groups.
At this time, the UE may further include: a second information determining unit 706, configured to determine, according to the mapping relationship received by the signaling receiving unit 701, DRS RE groups mapped to each DRS pattern allocated to the UE; or, according to a parameter policy agreed with the base station in advance, determining the DRS RE groups mapped by each DRS pattern allocated to the UE, and averaging the DRS patterns of each UE mapped on each DRS RE group by the parameter policy.
As can be seen from the above description, in the present invention, the base station allocates different DRS patterns for each downlink data of each UE in the PRB, and sends DRS pattern information corresponding to each downlink data allocated for the UE to the UE, so that the UE can demodulate each downlink data according to the DRS pattern information; in addition, the base station does not send downlink data on the DRS REs allocated for transmission of the DRS, and also sends DRS RE information allocated for transmission of the DRS in the PRB to the UE, so that the UE does not receive downlink data on the DRS REs allocated for transmission of the DRS, thereby avoiding transmission collision and ensuring normal transmission of the DRS. Therefore, the invention can realize DRS transmission aiming at each UE in MU-MIMO technology, so that each UE can accurately demodulate the downlink data.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (25)
1. A method for transmitting a dedicated reference signal DRS, the method comprising:
aiming at a physical resource block PRB allocated by a base station to a user terminal UE, the base station allocates DRS patterns corresponding to downlink data of each path for the UE, and transmits DRS pattern information allocated to the UE and DRS resource unit RE information allocated for transmitting DRS to the UE;
the base station sends DRS to the UE according to the DRS pattern information distributed to the UE, and does not send downlink data on the DRS RE distributed for transmitting the DRS;
the DRS patterns are location information of DRS on time-frequency resources, or a combination of the location information and spreading code information, and DRS patterns corresponding to each downlink data of each UE are different.
2. The method of claim 1, wherein DRS patterns corresponding to each downlink data of each UE are orthogonal to each other, and DRS REs are multiplexed by using one of Code Division Multiplexing (CDM), Frequency Division Multiplexing (FDM), and Time Division Multiplexing (TDM), or by using at least two of them jointly.
3. The method of claim 1, wherein sending DRS pattern information allocated for the UE to the UE specifically comprises: the base station and the UE agree in advance on a corresponding relation between a DRS pattern and a DRS pattern index, and the base station sends the DRS pattern index corresponding to the DRS pattern distributed to the UE according to the corresponding relation.
4. The method of claim 1, wherein sending DRS RE information allocated for transmission of DRSs to the UE specifically comprises:
dividing DRS RE into K groups in advance, wherein K is an integer larger than 1;
the base station sends indication information of a DRS RE group allocated for transmission of DRS to the UE; or, the base station and the UE agree in advance a usage order of each DRS RE group, and the base station sends the number of DRS RE groups allocated for transmission of DRSs to the UE; or, the base station and the UE agree in advance a use order of each DRS pattern and a mapping relationship between each DRS pattern and a DRS RE group, and the base station sends a total number of all DRS patterns allocated for the PRB to the UE; or, the base station sends the number of DRS patterns allocated in each DRS RE group in the PRB to the UE.
5. The method according to any one of claims 1 to 4, wherein the DRS pattern information allocated to the UE is sent via a Physical Downlink Control Channel (PDCCH);
and the DRS RE information allocated for transmitting the DRS is sent through a PDCCH or a higher layer signaling.
6. The method of claim 1, further comprising: the base station and the UE agree the use sequence of each DRS pattern in advance, and the base station further sends the total number of all DRS patterns allocated for the PRBs to the UE through a PDCCH or a high-level signaling, or sends the number of DRS patterns used in each DRS RE group to the UE according to the use sequence of each DRS pattern agreed with the UE and the mapping relation between each DRS pattern and the DRS RE group.
7. The method of claim 1, wherein the DRS REs are pre-grouped into K groups, where K is an integer greater than 1;
when a base station allocates DRS patterns corresponding to downlink data of each path to UE, averaging DRS patterns of each UE mapped on each DRS RE group, and further sending mapping relation from each DRS pattern allocated to the UE to the DRS RE group to the UE through a PDCCH; or,
the base station determines the mapping relation from each DRS pattern to a DRS RE group according to a parameter strategy agreed in advance with the UE, and distributes the DRS pattern corresponding to each path of downlink data for the UE according to the mapping relation; the parameter strategy enables DRS patterns of the UE mapped on the DRS RE groups to be averaged.
8. A method of receiving a dedicated reference signal DRS, the method comprising:
the method comprises the steps that UE receives DRS pattern information corresponding to downlink data of each path distributed by a base station for the UE and DRS RE information distributed for transmitting DRS in PRB distributed for the UE, does not receive the downlink data on DRS REs distributed for transmitting DRS, and demodulates the downlink data of each path according to the DRS pattern information;
the DRS pattern is position information of the DRS on time-frequency resources, or combination of the position information and spreading code information.
9. The method of claim 8, wherein the receiving, by the UE, the DRS pattern information corresponding to each downlink data path allocated by the base station to the UE specifically includes: and the UE receives the DRS pattern index sent by the base station and determines a DRS pattern corresponding to the received DRS pattern index according to a corresponding relation between the DRS pattern and the DRS pattern index agreed with the base station in advance.
10. The method of claim 8, wherein receiving, by the UE, DRS RE information allocated for transmission of DRS in a PRB allocated for the UE specifically comprises:
dividing DRS RE into K groups in advance, wherein K is an integer larger than 1;
the UE receives indication information of a DRS RE group allocated for transmission of DRS in the PRB; or, the UE receives the number of DRS RE groups allocated for transmission of DRSs in the PRB, and determines, according to a usage order of each DRS RE group agreed in advance with the base station, the DRS RE groups allocated for transmission of DRSs in the PRB; or, the UE receives the total number of all DRS patterns allocated for the PRB, and determines, according to a use order of DRS patterns agreed in advance with the base station and a mapping relationship between DRS patterns and DRS RE groups, a DRSRE group allocated in the PRB for transmitting DRS; or, the UE receives the number of DRS patterns allocated in each DRS RE group in the PRB, and determines, according to a use sequence of DRS patterns agreed in advance with the base station and a mapping relationship between the DRS patterns and the DRS RE groups, the DRS RE groups allocated in the PRB for transmitting DRSs.
11. The method according to claim 8, 9 or 10, wherein the UE receives DRS pattern information allocated to the UE through a PDCCH; and receiving DRS RE information allocated for transmission of DRS in the PRB through PDCCH or higher layer signaling.
12. The method of claim 8, wherein the UE further receives a total number of all DRS patterns allocated for the PRBs through a PDCCH or a higher layer signaling, and determines DRS pattern information allocated to other UEs according to a usage order of DRS patterns pre-agreed with the base station and DRS pattern information allocated to the UE; or,
and receiving the number of DRS patterns used in each DRS RE group through a PDCCH or a high-level signaling, and determining DRS pattern information allocated to other UE according to the use sequence of each DRS pattern pre-agreed with the base station, the mapping relation between each DRS pattern and the DRS RE group and DRS pattern information allocated to the UE.
13. The method of claim 8, wherein the DRS REs are pre-grouped into K groups, where K is an integer greater than 1;
the UE is also used for receiving the mapping relation from each DRS pattern allocated to the UE to the DRS RE group through the PDCCH, and determining the DRSRE group mapped by each DRS pattern allocated to the UE according to the mapping relation; or, according to a parameter policy agreed in advance with the base station, determining DRS RE groups mapped by each DRS pattern allocated to the UE, where the parameter policy makes DRS patterns of each UE mapped on each DRSRE group averaged.
14. A base station, comprising: the device comprises a pattern allocation unit, a signaling sending unit and a signal sending unit;
the pattern allocation unit is configured to allocate, for a PRB allocated for a UE, a DRS pattern corresponding to each downlink data path for the UE;
the signaling sending unit is configured to send DRS pattern information allocated to the UE and DRS RE information allocated to transmit DRS in a PRB allocated to the UE;
the signal transmitting unit is configured to transmit DRSs to the UE according to pattern information allocated to the UE, and not transmit downlink data on the DRS REs allocated for transmission of DRSs;
the DRS patterns are location information of DRS on time-frequency resources, or a combination of the location information and spreading code information, and DRS patterns corresponding to each downlink data of each UE are different.
15. The base station of claim 14, wherein the signaling sending unit sends, to the UE, a DRS pattern index corresponding to a DRS pattern allocated to the UE according to a correspondence between a DRS pattern and a DRS pattern index agreed in advance with the UE.
16. The base station of claim 14, wherein DRS REs are pre-grouped into K groups, where K is an integer greater than 1;
the signaling sending unit sends indication information of a DRS RE group allocated for transmission of a DRS to the UE; or, according to the use sequence of each DRS RE group agreed with the UE in advance, sending the number of DRS RE groups allocated for DRS transmission to the UE; or, according to a use order of each DRS pattern agreed in advance with the UE and a mapping relationship between each DRS pattern and a DRS RE group, transmitting a total number of all DRS patterns allocated for the PRB to the UE; or, the number of DRS patterns allocated in each DRS RE group in the PRB is sent to the UE.
17. The base station according to claim 14, 15 or 16, wherein the signaling sending unit sends DRS pattern information allocated for the UE through PDCCH; and transmitting the DRS RE information allocated for transmitting the DRS through a PDCCH or a higher layer signaling.
18. The base station of claim 14, wherein the signaling sending unit is further configured to send, to the UE, a total number of all DRS patterns allocated for the PRBs through PDCCH or higher layer signaling according to a usage order of DRS patterns pre-agreed with the UE; or, according to the use order of each DRS pattern agreed with the UE and the mapping relationship between each DRS pattern and the DRS RE group, sending the number of DRS patterns used in each DRS RE group to the UE.
19. The base station of claim 14, wherein DRS REs are pre-grouped into K groups, where K is an integer greater than 1;
when the pattern allocation unit allocates DRS patterns corresponding to each downlink data path to the UE, the pattern allocation unit averages the DRS patterns of each UE mapped on each DRS RE group, and notifies the signaling transmission unit to transmit the mapping relationship from each DRS pattern allocated to the UE to the DRS RE group to the UE through the PDCCH; or, according to a parameter policy agreed in advance with the UE, determining a mapping relationship between each DRS pattern and a DRS RE group, and allocating a DRS pattern corresponding to each downlink data for the UE according to the mapping relationship; the parameter strategy enables DRS patterns of the UE mapped on the DRS RE groups to be averaged.
20. A UE, comprising: a signaling receiving unit and a data receiving unit;
the signaling receiving unit is configured to receive DRS pattern information corresponding to each path of downlink data allocated by the base station to the UE and DRS RE information allocated to transmit DRS in a PRB allocated to the UE;
the data receiving unit is configured to not receive downlink data on the DRS REs allocated for transmission of the DRS, and demodulate each received downlink data according to the DRS pattern information;
the DRS pattern is position information of the DRS on time-frequency resources, or combination of the position information and spreading code information.
21. The UE of claim 20, further comprising: a first pattern determination unit;
the signaling receiving unit receives a DRS pattern index sent by the base station;
the first pattern determining unit is configured to determine, according to a correspondence between a DRS pattern and a DRS pattern index agreed in advance with the base station, a DRS pattern corresponding to the DRS pattern index received by the signaling receiving unit.
22. The UE of claim 20, wherein DRS REs are pre-grouped into K groups, where K is an integer greater than 1;
the signaling receiving unit receives indication information of a DRS RE group allocated for transmitting DRS in the PRB; or, receiving the number of DRS RE groups allocated for transmission of DRSs in the PRB; or, receiving a total number of all DRS patterns allocated for the PRB; or, receiving the number of DRS patterns allocated in each DRS RE group in the PRB;
the UE further comprises: a first information determining unit, configured to determine, according to each DRS pre-agreed with the base station, a DRS to be used for transmission of the first information
Determining a DRS RE group allocated for transmission of DRS in the PRB according to the use sequence of the RE groups and the number of the DRS RE groups allocated for transmission of DRS in the PRB; or determining, according to a use order of DRS patterns agreed in advance with the base station and a mapping relationship between DRS patterns and DRS RE groups, DRS RE groups allocated for transmission of DRSs in the PRB by using the total number of all DRS patterns allocated for the PRB; or determining, according to a use order of each DRS pattern predefined by the base station and a mapping relationship between each DRS pattern and a DRS RE group, a DRS RE group allocated for transmitting DRSs in the PRB by using the number of DRS patterns allocated in each DRS RE group.
23. The UE according to claim 20, 21 or 22, wherein the signaling receiving unit receives DRS pattern information allocated to the UE through a PDCCH; and receiving DRS RE information allocated for transmission of DRS in the PRB through PDCCH or higher layer signaling.
24. The UE of claim 20, wherein the signaling receiving unit is further configured to receive, through PDCCH or higher layer signaling, a total number of all DRS patterns allocated for the PRBs or a number of DRS patterns used in each DRS RE group;
the UE further comprises: a second pattern determining unit, configured to determine DRS pattern information allocated to other UEs according to a usage order of DRS patterns predefined with the base station, the total number of all DRS patterns allocated for the PRB, and DRS pattern information allocated to the UE; or, determining DRS pattern information allocated to other UEs according to a use sequence of DRS patterns agreed with the base station in advance, the number of DRS patterns used in each DRS RE group, a mapping relationship between each DRS pattern and a DRS RE group, and DRS pattern information allocated to the UE.
25. The UE of claim 20, wherein DRS REs are pre-grouped into K groups, where K is an integer greater than 1;
the signaling receiving unit is further configured to receive, through the PDCCH, a mapping relationship from each DRS pattern allocated to the UE to a DRS RE group;
the UE further comprises: a second information determining unit, configured to determine, according to the mapping relationship received by the signaling receiving unit, DRS RE groups mapped to each DRS pattern allocated to the UE; or, determining a DRSRE group mapped to each DRS pattern allocated to the UE according to a parameter policy agreed in advance with the base station, where the parameter policy makes DRS patterns of each UE mapped on each DRS RE group averaged.
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