CN101702638B - Indication method and device of transmission mode - Google Patents
Indication method and device of transmission mode Download PDFInfo
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- H—ELECTRICITY
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
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Abstract
The invention discloses indication method and device of a transmission mode. The method comprises the following step of adding indication information in a downlink control information format, wherein the indication information is used for indicating the transmission mode of user equipment and information corresponding to the transmission mode. The invention solves the problem of nonsupport of MIMO multi-user transmission based on demodulation pilot frequency in LTE of version 10 and realizes support of MIMO multi-user transmission based on the demodulation pilot frequency.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for indicating a transmission mode.
Background
In wireless communication, if a transmitting end (eNB) uses multiple antennas, we can use a spatial multiplexing method to increase the transmission rate, that is, different antenna positions on the same time-frequency resource at the transmitting end transmit different data, and a receiving end (UE) also uses multiple antennas, we can allocate resources of all antennas to the same user under the condition of a single user, and this transmission form is called SU-MIMO (single user MIMO), and in addition, we can allocate resources of different antenna spaces to different users under the condition of multiple users, and this transmission form is called MU-MIMO (multi-user MIMO). If the transmission system is to support single-user MIMO and multi-user MIMO at the same time, it is necessary for the eNB to provide the UE with data in both transmission modes using control signaling. The UE needs to know the Rank (Rank) used by the eNB for the UE transmission in both transmission modes, and in the single-user mode, because the resources of all antennas are allocated to the same user, the number of layers used for transmission is equal to the Rank used by the eNB for the transmission, while in the multi-user transmission, the number of layers used for transmission for one user is less than the total number of layers for the transmission. To achieve dynamic switching between single-user and multi-user transmission, the eNB needs to notify the UE of different data in different transmission modes.
In a version number 8(Release 8) of Long-Term Evolution (Long-Term Evolution, LTE for short), the following three downlink physical control channels are defined: physical downlink Control Format Indicator Channel (PCFICH for short), Physical hybrid automatic repeat request Indicator Channel (PCFICH)(Physical hybrid automatic transmission Request Indicator Channel, PHICH for short) and Physical Downlink Control Channel (PDCCH for short). The PDCCH is configured to carry Downlink Control Information (DCI), and includes: uplink and downlink scheduling information, and uplink power control information. The format of DCI (DCI format) is classified into the following: DCI format0, DCI format 1A, DCI format 1B, DCI format 1C, DCI format 1D, DCI format 2A, DCI format 3, and DCI format 3A; wherein the transmission mode 5 supporting multi-user MIMO utilizes the Downlink control information of DCIformat 1D, and the Downlink power offset field in DCI format 1Dpower-offsetIs used to display the information that the power of multi-user MIMO for one user is halved (i.e., -10log10(2)), because this mode only supports user MIMO transmission of two users, because with this bit, transmission mode 5 can support dynamic switching of single-user and multi-user transmission, but can support transmission of only one stream for each UE regardless of single-user or multi-user transmission, although lte elease 8 supports single-user transmission of at most two streams in transmission mode 4, because switching between transmission modes can only be semi-static, so it is impossible to achieve dynamic switching of single-user multi-stream transmission and multi-user transmission at version number 8.
In addition, in the version number 10 of LTE, the MIMO transmission mode already determines a Demodulation pilot (DMRS) to be used as a Demodulation pilot, and the UE needs to acquire the position of the pilot to estimate the channel and interference on the pilot. For example, in version number 10 of LTE, three different patterns (DMRS patterns) are preliminarily defined, and when the total number of transmission layers or rank is 1 to 2, the first Pattern (DMRS Pattern 1) is used, when the total number of transmission layers or rank is 3 to 4, the second Pattern (DMRS Pattern 2) is used, and when the total number of transmission layers or rank is 5 to 8, the third Pattern (DMRS Pattern 3) is used. In single-user transmission, data of all transmission layers are sent to the same UE, so the UE can know the pilot pattern and the position of the pilot as long as acquiring the rank. In multi-user transmission, the UE needs to know the rank and layer to start transmitting to the UE, and the UE needs to know the pilot pattern for transmission to obtain the interfered pilot position. In the existing technology of release number 8, the same requirement does not exist, so that the release number 10 of the LTE needs a new signaling to support the DMRS-based MIMO multi-user transmission.
Disclosure of Invention
The present invention is proposed to solve the problem that MIMO multi-user transmission based on demodulation pilot is not supported in the LTE version number 10, and therefore, the main object of the present invention is to provide a method and an apparatus for indicating a transmission scheme, so as to solve the above problem.
In order to achieve the above object, according to an aspect of the present invention, there is provided a method for indicating a transmission mode, including: and adding indication information in a downlink control information format, wherein the indication information is used for indicating the transmission mode of the user equipment and information corresponding to the transmission mode.
Preferably, the indication information is a plurality of bits.
Preferably, the transmission mode of the user equipment includes at least one of: single user transmission mode, multi-user transmission mode.
Preferably, when the indication information is used for indicating a multi-user transmission mode of the user equipment, the information includes: the layer index of the transmission is performed by the user equipment.
Preferably, when the indication information is used for indicating the multi-user transmission mode of the user equipment, the information further includes at least one of: pilot patterns corresponding to the multi-user transmission modes, and the total number of layers of the multi-user transmission modes.
Preferably, when the indication information is used to indicate the single-user transmission mode, the information is a rank corresponding to the single-user transmission mode.
In order to achieve the above object, according to another aspect of the present invention, there is provided a transmission mode indicating apparatus including: and the adding module is used for adding indication information in the downlink control information format, wherein the indication information is used for indicating the transmission mode of the user equipment and information corresponding to the transmission mode.
Preferably, the indication information is a plurality of bits.
Preferably, when the indication information is used for indicating a multi-user transmission mode of the user equipment, the information includes: the layer index of the transmission is performed by the user equipment.
Preferably, when the indication information is used for indicating the multi-user transmission mode of the user equipment, the information further includes at least one of: pilot patterns corresponding to the multi-user transmission modes, and the total number of layers of the multi-user transmission modes.
Preferably, when the indication information is used to indicate the single-user transmission mode, the information is a rank corresponding to the single-user transmission mode.
According to the invention, the indication information is added in the downlink control information format, wherein the indication information is used for indicating the transmission mode of the user equipment and the information corresponding to the transmission mode, so that the problem that the MIMO multi-user transmission based on the demodulation pilot frequency is not supported in the version number 10 of LTE is solved, and the MIMO multi-user transmission based on the demodulation pilot frequency is supported.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic view according to the related art;
fig. 2 is a schematic illustration of embodiment 1.1 according to the invention.
Detailed Description
Overview of the function
In view of the problem that the related art does not support MIMO multi-user transmission based on demodulation pilot in the LTE version number 10, embodiments of the present invention provide a method and an apparatus for indicating a transmission mode, where indication information is added to a downlink control information format, where the indication information is used to indicate a transmission mode of a user equipment and information corresponding to the transmission mode, so as to support MIMO multi-user transmission based on demodulation pilot.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Method embodiment
According to an embodiment of the present invention, a method for indicating a transmission mode is provided, which is applied to a multi-antenna transmission system supporting dynamic switching between single-user multi-stream transmission and multi-user transmission. The method includes adding indication information in a downlink control information format, where the indication information is used to indicate a transmission mode of a user equipment (i.e., a single-user or multi-user transmission mode) and information corresponding to the transmission mode (i.e., information required in different transmission modes).
Wherein, the downlink control information format is a new downlink control information format (DCIFormat X).
The indication information is a plurality of bits (specifically defined as K bits).
Specifically, when the indication information is used to indicate a multi-user transmission mode of the user equipment, the information includes: the rank corresponding to the multiuser transmission scheme and the number of layers the user equipment starts to transmit (i.e., the eNB notifies the UE of the rank used for transmission and which layer starts to transmit to the UE).
Specifically, when the indication information is used to indicate a multi-user transmission mode of the user equipment, the information further includes one of the following: a pilot Pattern corresponding to the multi-user transmission scheme, and the total number of layers of the multi-user transmission scheme (that is, the eNB notifies the UE of the pilot Pattern (DMRS Pattern) for this transmission or the total number of layers of the multi-user transmission).
Specifically, when the indication information is used to indicate the single-user transmission scheme, the information is a rank corresponding to the single-user transmission scheme (that is, the eNB notifies the UE that the rank is used for UE transmission).
The following describes in detail the implementation of the embodiments of the present invention with reference to examples.
As an embodiment of the present invention, in a multi-antenna input/output (MIMO) scenario, a newly defined DCI Format X may be used to indicate a single-user or multi-user transmission mode, and the K bit signaling may include the following information:
SU/MU-MIMO-S stands for single user transmission, M stands for multi-user transmission;
rank (rank value) -rank value represents the transmission to the UE for multi-user and single-user transmissions, which is also equal to the total number of layers for the transmission for single-user transmissions;
layer index-the index of the layer used in multi-user and single-user transmission, the layer index is from layer one to rank value in single-user transmission;
DMRS pattern-DMRS pattern used in transmission; or
Total layer number-total layer number used in transmission
The DCI Format X may correspond to one Transmission (TB) block, may represent single-layer transmission, and may also correspond to two Transmission (TB) blocks, if both transmission blocks are enabled, the DCI Format X may represent two-layer to eight-layer transmission, and when only one transmission block is enabled, the DCI Format X may represent single-layer to four-layer transmission according to a transmission block-to-layer mapping rule. The DCI Format X may also support the transmission of one and two Transport Block (TB) simultaneously with the same set of signaling. In addition, the following embodiments are shown, assuming that the signaling is affected differently and the required overhead (K bits) is different.
Example 1
Assumption in example 1:
when MU-MIMO (multi-user MIMO), the multiplexing layer number is at most 4, and each UE multiplexing layer number is at most 2;
there are three modes for dmrs, mode 1: maximum number of layers 1 and 2, mode 2: maximum number of layers 3 and 4, mode 3: the maximum number of layers being 5 to 8
c. Only UE is informed of DMRS Pattern, and different DMRS patterns have different signaling
Example 1.1
DCI Format may represent signaling (unified signaling) of one or two Transport Blocks (TB)
The DCI Format X of embodiment 1.1 supports the transmission of one and two Transport (TB) blocks simultaneously with the same set of signaling:
SU-MIMO has 8 states
The state is as follows: 1 to 8 layers; (number of layers)
MU-MIMO has 6 states
Rank1：
DMRS pattern 1: layer 1, layer 2 (layer index)
DMRS pattern 2: layer 1, layer 2, layer 3, layer 4
Rank 2: (2 states)
DMRS pattern 2: layers 1 and 2, layers 3 and 4
The total number of states is 8+6+ 2-16, and the signaling overhead is K-4 bits
| Signaling | SU/MU-MIMO | Rank value | Indexing of layers | DMRS patterns |
| 0 | S | 1 | 1 | 1 |
| 1 | S | 2 | 1，2 | 1 |
| 2 | S | 3 | 1，2，3 | 2 |
| 3 | S | 4 | 1 to 4 | 2 |
| 4 | S | 5 | 1 to 5 | 3 |
| 5 | S | 6 | 1 to 6 | 3 |
| 6 | S | 7 | 1 to 7 | 3 |
| 7 | S | 8 | 1 to 8 | 3 |
| 8 | M | 1 | 1 | 1 |
| 9 | M | 1 | 2 | 1 |
| 10 | M | 1 | 1 | 2 |
| 11 | M | 1 | 2 | 2 |
| 12 | M | 1 | 3 | 2 |
| 13 | M | 1 | 4 | 2 |
| 14 | M | 2 | 1，2 | 2 |
| 15 | M | 2 | 3，4 | 2 |
Fig. 2 is a schematic diagram of embodiment 1.1 according to the present invention, as shown in fig. 2, including steps S202 to S220 as follows:
step S202, the eNB sends a downlink control signaling to the UE.
In step S204, the UE determines whether MU?
In step S206, the UE knows that this is a multi-user transmission and knows the rank used for the transmission from the rank value.
In step S208, the UE knows the pilot pattern for transmission from the DMRS pattern, and at the same time, the UE knows from the index of the layer that transmission is started, so that the UE can know the position of the pilot.
In step S210, the UE knows the position of the layer transmitted by the UE, and then can measure the channel and the interference, and then continue to demodulate.
Step S212, the processing for multi-user transmission is completed.
In step S214, the UE knows that this is a single-user transmission and knows the rank used for the transmission from the rank value.
In step S216, the rank used by the UE for transmission is equal to the known pilot pattern for transmission, and the position of the pilot is known.
In step S218, the UE knows the position of the layer for transmitting itself, and then can measure the channel and interference, and then continue to demodulate.
Step S220, completing the processing of single-user transmission.
Example 1.2
Signaling that represents only one Transport (TB) block in DCI Format
DCI Format X of embodiment 1.2 corresponds to one Transport (TB) block, DCIFormat X indicates that SU-MIMO has 8 states for single-layer transmission or two-layer transmission corresponding to one Transport (TB) block
The state is as follows: 1 to 8 layers; (number of layers)
MU-MIMO has 6 states
Rank1：
DMRS pattern 1: layer 1, layer 2 (layer index)
DMRS pattern 2: layer 1, layer 2, layer 3, layer 4
Rank 2: (2 states)
DMRS pattern 2: layers 1 and 2, layers 3 and 4
The total number of states is 2+6+ 2-10, and the signaling overhead is K-4 bits
Example 1.3
Signaling that only represents one TB in DCI Format
Signaling that represents only one Transport (TB) block in DCI Format
DCI Format X of embodiment 1.3 corresponds to one Transport (TB) block, DCI Format X denotes single layer transport
SU-MIMO has 1 state
The state is as follows: 1 layer; (number of layers)
MU-MIMO has 6 states
Rank1：
DMRS pattern 1: layer 1, layer 2 (layer index)
DMRS pattern 2: layer 1, layer 2, layer 3, layer 4
The total number of states is 1+ 6-7, and the signaling overhead is K-3 bits
Example 1.4
Signaling of two TBs in DCI Format
DCI Format X corresponds to two Transport (TB) blocks, which would indicate a two to eight layer transmission if both transport blocks were enabled
Both TBs are enabled
SU-MIMO has 7 states
The state is as follows: 2 to 8 layers; (number of layers)
MU-MIMO has 2 states
Rank 2: (2 states)
DMRS pattern 1: layer 1 and layer 2 (layer index)
DMRS pattern 2: layers 1 and 2, layers 3 and 4
The total number of states is 7+ 2-9, and the signaling overhead is K-4 bits
Example 1.5
One TB Enable
The DCI Format X may also correspond to two Transport Block (TB) blocks, and if only one TB block is enabled, the DCI Format X may indicate single-layer to four-layer transmission according to a transport block to layer mapping rule.
SU-MIMO has 4 states
The state is as follows: 1 to 4 layers; (number of layers)
MU-MIMO has 2 states
Rank 1: (6 states)
DMRS pattern 1: layer 1, layer 2
DMRS pattern 2: layer 1, layer 2, layer 3, layer 4
Rank 2: (2 states)
DMRS pattern 1: layer 1 and layer 2 (layer index)
DMRS pattern 2: layers 1 and 2, layers 3 and 4
The total number of states is 4+6+ 2-12, and the signaling overhead is K-4 bits
Example 2
Assumption in example 2:
when in MU-MIMO, the multiplexing layer number is at most 8, and each UE multiplexing layer number is at most 2;
there are three modes for dmrs, mode 1: maximum number of layers 1 and 2, mode 2: maximum number of layers 3 and 4, mode 3: the maximum number of layers being 5 to 8
c. Only UE is informed of DMRS Pattern, and different DMRS patterns have different signaling
Example 2.1
DCI Format may represent signaling of one or two TBs (unified signaling)
The DCI Format X of embodiment 2.1 supports the transmission of one and two Transport (TB) blocks simultaneously with the same set of signaling:
SU-MIMO has 8 states
The state is as follows: 1 to 8 layers; (number of layers)
MU-MIMO has 20 states
Rank 1: (14 states)
DMRS pattern 1: layer 1, layer 2
DMRS pattern 2: layer 1, layer 2, layer 3, layer 4
DMRS pattern 3: layer 1, layer 2, layer 3, layer 4, layer 5, layer 6, layer 7, layer 8
Rank 2: (6 states)
DMRS pattern 2: layers 1 and 2, layers 3 and 4
DMRS pattern 3: layers 1 and 2, layers 3 and 4, layers 5 and 6, and layers 7 and 8
The total number of states is 8+14+ 6-28, and the signaling overhead is K-5 bits
| Signaling | SU/MU-MIMO | Rank value | Indexing of layers | DMRS patterns |
| 0 | S | 1 | 1 | 1 |
| 1 | S | 2 | 1，2 | 1 |
| 2 | S | 3 | 1，2，3 | 2 |
| 3 | S | 4 | 1 to 4 | 2 |
| 4 | S | 5 | 1 to 5 | 3 |
| 5 | S | 6 | 1 to 6 | 3 |
| 6 | S | 7 | 1 to 7 | 3 |
| 7 | S | 8 | 1 to 8 | 3 |
| 8 | M | 1 | 1 | 1 |
| 9 | M | 1 | 2 | 1 |
| 10 | M | 1 | 1 | 2 |
| 11 | M | 1 | 2 | 2 |
| 12 | M | 1 | 3 | 2 |
| 13 | M | 1 | 4 | 2 |
| 14 | M | 2 | 1，2 | 2 |
| 15 | M | 2 | 3，4 | 2 |
| 16 | M | 1 | 1 | 3 |
| 17 | M | 1 | 2 | 3 |
| 18 | M | 1 | 3 | 3 |
| 19 | M | 1 | 4 | 3 |
| 20 | M | 1 | 5 | 3 |
| 21 | M | 1 | 6 | 3 |
| 22 | M | 1 | 7 | 3 |
| 23 | M | 1 | 8 | 3 |
| 24 | M | 2 | 1，2 | 3 |
| 25 | M | 2 | 3，4 | 3 |
| 26 | M | 2 | 5，6 | 3 |
| 27 | M | 2 | 7，8 | 3 |
Example 2.2
Signaling that represents only one Transport (TB) block in DCI Format
DCI Format X of embodiment 2.2 corresponds to one Transport (TB) block, DCI Format X denotes single layer transport
SU-MIMO has 2 states
The state is as follows: 2 layers; (number of layers)
MU-MIMO has 21 states
Rank 1: (14 states)
DMRS pattern 1: layer 1, layer 2
DMRS pattern 2: layer 1, layer 2, layer 3, layer 4
DMRS pattern 3: layer 1, layer 2, layer 3, layer 4, layer 5, layer 6, layer 7, layer 8
Rank 2: (6 states)
DMRS pattern 2: layers 1 and 2, layers 3 and 4
DMRS pattern 3: layers 1 and 2, layers 3 and 4, layers 5 and 6, and layers 7 and 8
The total number of states is 2+14+ 6-22, and the signaling overhead is K-5 bits
Example 2.3
Signaling that represents only one Transport (TB) block in DCI Format
DCI Format X of embodiment 2.3 corresponds to one Transport (TB) block, DCI Format X denotes single layer transport
SU-MIMO has 1 state
The state is as follows: 1 layer; (number of layers)
MU-MIMO has 21 states
Rank 1: (14 states)
DMRS pattern 1: layer 1, layer 2 (layer index)
DMRS pattern 2: layer 1, layer 2, layer 3, layer 4
DMRS pattern 3: layer 1, layer 2, layer 3, layer 4, layer 5, layer 6, layer 7, layer 8
Rank 2: (7 states)
The total number of states is 1+ 14-15, and the signaling overhead is K-4 bits
Example 2.4
Signaling of two TBs in DCI Format
DCI Format X corresponds to two Transport (TB) blocks, which would indicate a two to eight layer transmission if both transport blocks were enabled
Two TB person enablement
SU-MIMO has 7 states
The state is as follows: 2 to 8 layers; (number of layers)
MU-MIMO has 6 states
Rank 2: (6 states)
DMRS pattern 1: layer 1 and layer 2 (layer index)
DMRS pattern 2: layers 1 and 2, layers 3 and 4
DMRS pattern 3: layers 1 and 2, layers 3 and 4, layers 5 and 6, and layers 7 and 8
The total number of states is 7+ 6-13, and the signaling overhead is K-4 bits
Example 2.5
One TB Enable
The DCI Format X may also correspond to two Transport Block (TB) blocks, and if only one TB block is enabled, the DCI Format X may indicate single-layer to four-layer transmission according to a transport block to layer mapping rule.
SU-MIMO has 4 states
The state is as follows: 1 to 4 layers; (number of layers)
MU-MIMO has 20 states
Rank 1: (14 states)
DMRS pattern 1: layer 1, layer 2
DMRS pattern 2: layer 1, layer 2, layer 3, layer 4
DMRS pattern 3: layer 1, layer 2, layer 3, layer 4, layer 5, layer 6, layer 7, layer 8
Rank 2: (6 states)
DMRS pattern 1: layer 1 and layer 2
DMRS pattern 2: layers 1 and 2, layers 3 and 4
Mode 3: layers 1 and 2, layers 3 and 4, layers 5 and 6, and layers 7 and 8
The total number of states is 4+14+ 6-24, and the signaling overhead is K-5 bits
Example 3.
Assumption in example 3:
multiplexing the maximum 4 UE (user equipment) in MU-MIMO (multiple user-multiple input multiple output), wherein the multiplexing layer number of each UE is maximum 2;
there are three modes for dmrs, mode 1: maximum number of layers 1 and 2, mode 2: maximum number of layers 3 and 4, mode 3: the maximum number of layers being 5 to 8
c. Only UE is informed of DMRS Pattern, and different DMRS patterns have different signaling
Example 3.1
DCI Format may represent signaling of one or two TBs (unified signaling)
The DCI Format X of embodiment 3.1 supports the transmission of one and two Transport (TB) blocks simultaneously with the same set of signaling:
SU-MIMO has 8 states
The state is as follows: 1 to 8 layers; (number of layers)
MU-MIMO has 15 states
Rank 1: (9 states)
DMRS pattern 1: layer 1, layer 2
DMRS pattern 2: layer 1, layer 2, layer 3, layer 4
DMRS pattern 3: layer 1, layer 2, layer 3, layer 4, layer 5, layer 6, layer 7, layer 8
Rank 2: (6 states)
DMRS pattern 2: layers 1 and 2, layers 3 and 4
DMRS pattern 3: layers 1 and 2, layers 3 and 4, layers 5 and 6, and layers 7 and 8
The total number of states is 8+9+ 6-23, and the signaling overhead is K-5 bits
Example 3.2
Signaling that represents only one Transport (TB) block in DCI Format
DCI Format X of embodiment 3.2 corresponds to one Transport (TB) block, DCI Format X denotes single layer transport
SU-MIMO has 1 state
The state is as follows: 1 layer; (number of layers)
MU-MIMO has 9 states
Rank 1: (9 states)
DMRS pattern 1: layer 1, layer 2
DMRS pattern 2: layer 1, layer 2, layer 3, layer 4
DMRS pattern 3: layer 1, layer 2, layer 3
The total number of states is 1+ 9-10, and the signaling overhead is K-4 bits
Example 3.3
Signaling of two TBs in DCI Format
DCI Format X corresponds to two Transport (TB) blocks, which would indicate a two to eight layer transmission if both transport blocks were enabled
Both TBs are enabled
SU-MIMO has 7 states
The state is as follows: 2 to 8 layers; (number of layers)
MU-MIMO has 6 states
Rank 2: (6 states)
DMRS pattern 1: layer 1 and layer 2 (layer index)
DMRS pattern 2: layers 1 and 2, layers 3 and 4
DMRS pattern 3: layers 1 and 2, layers 3 and 4, layers 5 and 6, and layers 7 and 8
The total number of states is 7+ 6-13, and the signaling overhead is K-4 bits
Example 3.4
One TB Enable
SU-MIMO (number of layers) (4 states)
One UE multiplexes 4 layers at most, state: 1 layer, 2 layers, 3 layers, 4 layers;
MU-MIMO (layer index)
Rank 1: (9 states)
Mode 1: layer 1, layer 2
Mode 2: layer 1, layer 2, layer 3, layer 4
Mode 3: layer 1, layer 2, layer 3, layer 4, layer 5, layer 6, layer 7, layer 8
Rank 2: (6 states)
Mode 1: layer 1 and layer 2
Mode 2: layers 1 and 2, layers 3 and 4
Mode 3: layers 1 and 2, layers 3 and 4, layers 5 and 6, and layers 7 and 8
The total number of states 4+9+6 is 19, and the signaling overhead is K5 bits
Example 4.
Assumption in example 4:
when in MU-MIMO, the multiplexing layer number is at most 4, and each UE multiplexing layer number is at most 2;
there are three modes for dmrs, mode 1: maximum number of layers 1 and 2, mode 2: maximum number of layers 3 and 4, mode 3: the maximum number of layers being 5 to 8
c. Informing the UE of the total number of layers, different total number of layers having different signaling
Example 4.1
DCI Format may represent signaling of one or two TBs (unified signaling)
SU-MIMO (number of layers) (8 states)
The state is as follows: 1 to 8 layers;
MU-MIMO (layer index)
Rank 1: (9 states)
Mode 1: layer 1, layer 2
Mode 2: layer 1, layer 2, layer 3, layer 4
Rank 2: (3 states)
Mode 2: layers 1 and 2, layers 3 and 4
The total number of states 8+9+3 is 20, and the signaling overhead is K5 bits
Example 4.2
Signaling that only represents one TB in DCI Format
SU-MIMO (number of layers) (2 states)
One UE has a maximum of layer 1, state: 1 layer of
MU-MIMO (layer index)
Rank 1: (9 states)
Mode 1: layer 1, layer 2
Mode 2: layer 1, layer 2, layer 3, layer 4
The total number of states 2+9 equals 11, and the signaling overhead is K equals 4 bits
Example 4.3
Signaling of two TBs in DCI Format
Both TBs are enabled
SU-MIMO (number of layers) (7 states)
The state is as follows: 2 to 8 layers;
MU-MIMO (layer index)
Rank 2: (3 states)
Mode 1: layers 1 and 2, layers 3 and 4
The total number of states is 7+ 3-10, and the signaling overhead is K-4 bits
Example 4.4
One TB Enable
SU-MIMO (number of layers) (4 states)
One UE multiplexes 4 layers at most, state: 1 layer, 2 layers, 3 layers, 4 layers;
MU-MIMO (layer index)
Rank 1: (9 states)
Mode 1: layer 1, layer 2
Mode 2: layer 1, layer 2, layer 3, layer 4
Rank 2: (3 states)
Mode 1: layer 1 and layer 2
Mode 2: layers 1 and 2, layers 3 and 4
The total number of states 4+9+3 equals 16, and the signaling overhead is K equals 4 bits
Example 5.
Assumption in example 5:
when in MU-MIMO, the multiplexing layer number is at most 8, and each UE multiplexing layer number is at most 2;
there are three modes for dmrs, mode 1: maximum number of layers 1 and 2, mode 2: maximum number of layers 3 and 4, mode 3: the maximum number of layers being 5 to 8
c. In mode 1-2, the UE is informed of the total number of layers, and in mode 3, the UE is informed of whether the total number of layers is singular or even
Example 5.1
DCI Format may represent signaling of one or two TBs (unified signaling)
SU-MIMO (number of layers) (8 states)
The state is as follows: 1 to 8 layers;
MU-MIMO (layer index)
Rank 1: (24 states)
Mode 1: layer 1, layer 2
Mode 2: layer 1, layer 2, layer 3, layer 4
Mode 3: layer 1, layer 2, layer 3, layer 4, layer 5, layer 6, layer 7, layer 8
Rank 2: (10 states)
Mode 2: layers 1 and 2, layers 3 and 4
Mode 3: layers 1 and 2, layers 3 and 4, layers 5 and 6, and layers 7 and 8
The total number of states 8+24+10 equals 42, and the signaling overhead is K equals 6 bits
Example 6.
Multiplexing the maximum number of the UE (user equipment) in MU-MIMO (multiple user-multiple input multiple output), wherein the multiplexing layer number of each UE is 2 at most;
there are three modes for dmrs, mode 1: maximum number of layers 1 and 2, mode 2: maximum number of layers 3 and 4, mode 3: the maximum number of layers being 5 to 8
c. In mode 1-2, the UE is informed of the total number of layers, and in mode 3, the UE is informed of whether the total number of layers is singular or even
Example 6.1
DCI Format may represent signaling of one or two TBs (unified signaling)
SU-MIMO (number of layers) (8 states)
The state is as follows: 1 to 8 layers;
MU-MIMO (layer index)
Rank 1: (14 states)
Mode 1: layer 1, layer 2
Mode 2: layer 1, layer 2, layer 3, layer 4
Mode 3: layer 1, layer 2, layer 3
Rank 2: (10 states)
Mode 2: layers 1 and 2, layers 3 and 4
Mode 3: layers 1 and 2, layers 3 and 4, layers 5 and 6, and layers 7 and 8
The total number of states 8+14+10 equals 32, and the signaling overhead is K equals 5 bits
| Signaling | SU/MU-MIMO | Rank value | Indexing of layers | Total number of layers |
| 0 | S | 1 | 1 | 1 |
| 1 | S | 2 | 1，2 | 2 |
| 2 | S | 3 | 1，2，3 | 3 |
| 3 | S | 4 | 1 to 4 | 4 |
| 4 | S | 5 | 1 to 5 | 5 |
| 5 | S | 6 | 1 to 6 | 6 |
| 6 | S | 7 | 1 to 7 | 7 |
| 7 | S | 8 | 1 to 8 | 8 |
| 8 | M | 1 | 1 | 2 |
| 9 | M | 1 | 2 | 2 |
| 10 | M | 1 | 1 | 3 |
| 11 | M | 1 | 2 | 3 |
| 12 | M | 1 | 3 | 3 |
| 13 | M | 2 | 1，2 | 3 |
| 14 | M | 1 | 1 | 4 |
| 15 | M | 1 | 2 | 4 |
| 16 | M | 1 | 3 | 4 |
| 17 | M | 1 | 4 | 4 |
| 18 | M | 2 | 1，2 | 4 |
| 19 | M | 2 | 3，4 | 4 |
| 20 | M | 1 | 1 | 5or7 |
| 21 | M | 1 | 2 | 5 |
| 22 | M | 1 | 3 | 5 |
| 23 | M | 2 | 3，4 | 5or7 |
| 24 | M | 2 | 5，6 | 5or7 |
| 25 | M | 2 | 7，8 | 7 |
| 26 | M | 1 | 1 | 6or8 |
| 27 | M | 1 | 2 | 6or8 |
| 28 | M | 2 | 1，2 | 8 |
| 29 | M | 2 | 3，4 | 6or8 |
| 30 | M | 2 | 5，6 | 6or8 |
| 31 | M | 2 | 7，8 | 8 |
Example 7.
Assumption in example 7:
when in MU-MIMO, the multiplexing layer number is at most 8, and each UE multiplexing layer number is at most 2;
there are three modes for dmrs, mode 1: maximum number of layers 1 and 2, mode 2: maximum number of layers 3 and 4, mode 3: the maximum number of layers being 5 to 8
c. Informing UE of the total number of layers
Example 7.1
DCI Format may represent signaling of one or two TBs (unified signaling)
SU-MIMO (number of layers) (8 states)
The state is as follows: 1 to 8 layers;
MU-MIMO (layer index)
Rank 1: (35 states)
Mode 1: layer 1, layer 2
Mode 2: layer 1, layer 2, layer 3, layer 4
Mode 3: layer 1, layer 2, layer 3, layer 4, layer 5, layer 6, layer 7, layer 8
Rank 2: (15 states)
Mode 2: layers 1 and 2, layers 3 and 4
Mode 3: layers 1 and 2, layers 3 and 4, layers 5 and 6, and layers 7 and 8
The total number of states 8+35+15 equals 58, and the signaling overhead is K equals 6 bits
According to the embodiment of the invention, the indication information is added in the downlink control information format, wherein the indication information is used for indicating the transmission mode of the user equipment and the information corresponding to the transmission mode, and the MIMO multi-user transmission based on the demodulation pilot frequency is supported.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
Device embodiment
According to an embodiment of the present invention, an apparatus for indicating a transmission mode is provided, which includes an adding module, configured to add indication information in a downlink control information format, where the indication information is a plurality of bits (specifically defined as K bits).
Wherein, the downlink control information format is a new downlink control information format (DCIFormat X).
Specifically, when the indication information is used to indicate a multi-user transmission mode of the user equipment, the information includes: the rank corresponding to the multiuser transmission scheme and the number of layers the user equipment starts to transmit (i.e., the eNB notifies the UE of the rank used for transmission and which layer starts to transmit to the UE).
Specifically, when the indication information is used to indicate a multi-user transmission mode of the user equipment, the information further includes one of the following: a pilot Pattern corresponding to the multi-user transmission scheme, and the total number of layers of the multi-user transmission scheme (that is, the eNB notifies the UE of the pilot Pattern (DMRS Pattern) for this transmission or the total number of layers of the multi-user transmission).
Specifically, when the indication information is used to indicate the single-user transmission scheme, the information is a rank corresponding to the single-user transmission scheme (that is, the eNB notifies the UE that the rank is used for UE transmission).
It should be noted that the indication apparatus of the transmission manner described in the apparatus embodiment corresponds to the above-mentioned method embodiment, and a specific implementation process thereof has been described in detail in the method embodiment, and is not described herein again.
In summary, according to the embodiments of the present invention, indication information is added to a downlink control information format, where the indication information is used to indicate a transmission mode of a user equipment and information corresponding to the transmission mode, so as to solve the problem that MIMO multi-user transmission based on demodulation pilot is not supported in the LTE version number 10, and implement MIMO multi-user transmission based on demodulation pilot.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A method for indicating a transmission mode, comprising:
adding indication information in a downlink control information format, wherein the indication information is used for indicating a transmission mode of user equipment and information corresponding to the transmission mode;
wherein the indication information is a plurality of bits;
the transmission mode of the user equipment comprises at least one of the following modes: single-user transmission mode, multi-user transmission mode; wherein,
when the indication information is used for indicating the multi-user transmission mode of the user equipment, the information includes: layer index transmitted by the user equipment; or,
and when the indication information is used for indicating the single-user transmission mode, the information is the rank corresponding to the single-user transmission mode.
2. The method according to claim 1, wherein when the indication information is used for indicating the multi-user transmission mode of the user equipment, the information further comprises at least one of:
a pilot pattern corresponding to the multi-user transmission mode, a total number of layers of the multi-user transmission mode.
3. An apparatus for indicating a transmission mode, comprising:
an adding module, configured to add indication information in a downlink control information format, where the indication information is used to indicate a transmission mode of a user equipment and information corresponding to the transmission mode;
the indication information is a plurality of bits;
the transmission mode of the user equipment comprises at least one of the following modes: single-user transmission mode, multi-user transmission mode; wherein,
when the indication information is used for indicating the multi-user transmission mode of the user equipment, the information includes: layer index transmitted by the user equipment; or,
and when the indication information is used for indicating the single-user transmission mode, the information is the rank corresponding to the single-user transmission mode.
4. The apparatus of claim 3, wherein when the indication information indicates the multi-user transmission mode of the UE, the information further comprises at least one of:
a pilot pattern corresponding to the multi-user transmission mode, a total number of layers of the multi-user transmission mode.
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| JP2014517580A (en) * | 2011-05-06 | 2014-07-17 | 富士通株式会社 | Transmission mode setting method, user equipment and base station |
| CN107040345B (en) * | 2016-02-03 | 2020-12-18 | 华为技术有限公司 | Method and apparatus for transmitting pilot signal |
| WO2018201410A1 (en) * | 2017-05-04 | 2018-11-08 | 华为技术有限公司 | Method and device for acquiring control information |
| WO2018227337A1 (en) | 2017-06-12 | 2018-12-20 | Qualcomm Incorporated | Techniques and apparatuses for signaling regarding bandwidth dependent control size |
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