CN105634707A - Information transmission method, base station and terminal - Google Patents

Information transmission method, base station and terminal Download PDF

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Publication number
CN105634707A
CN105634707A CN201511030027.6A CN201511030027A CN105634707A CN 105634707 A CN105634707 A CN 105634707A CN 201511030027 A CN201511030027 A CN 201511030027A CN 105634707 A CN105634707 A CN 105634707A
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dmrs
terminals
base station
format information
port
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CN105634707B (en
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王三新
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Shenzhen Microphone Holdings Co Ltd
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Shenzhen Jinli Communication Equipment Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses an information transmission method, a base station and a terminal. The method comprises steps that the base station determines first format information of DCIs of at least one terminal in multiple terminals according to quantity of the multiple terminals where data transmission should be carried out, wherein the first format information comprises SCIDs and DMRSes, wherein the SCIDs are used for scrambling antenna ports, the DMRSes correspond to different antenna ports and DMRS sequences used by every two DMRSes are mutually orthogonal; sending the first format information of the DCIs to at least one terminal in the multiple terminals; and using determined antenna ports corresponding to the DMRSes to send data to at least one terminal in the terminals so as to allow the at least one terminal in the terminals to receive data sent by the base station based on the first format information of the DCIs. The invention also discloses the base station and the terminal. According to the invention, use rate of spectrum resources is increased and requirements of MU-MIMO are met.

Description

Information transmission method, base station and terminal
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an information transmission method, a base station, and a terminal.
Background
With the popularization and application of mobile terminals and the continuous increase of mobile services, the demand of wireless transmission rate increases exponentially, a high-rate and high-quality communication technology becomes a research target of a next-generation communication system, and a Multi-antenna technology represented by Multi-input Multi-Output (MIMO) is one of the best schemes for achieving the above target. Among them, the related stereo beamforming (EBF)/full-dimensional multiple-input multiple-Output (FD-MIMO) is a transmission technique based on channel state information reference signal (CSI-RS) feedback and demodulation reference signal (DMRS) demodulation.
However, in the prior art, transmission schemes capable of supporting CSI-RS feedback and DMRS demodulation, such as TM9 and TM10, only support Single-user multi-input multi-Output (SU-MIMO), and the use efficiency of spectrum resources in wireless communication is still insufficient to meet the requirement.
Disclosure of Invention
The technical problem to be solved in the embodiments of the present invention is to provide an information transmission method, a base station, and a terminal. The requirement of multi-user multiple input and multiple output can be met, and the use efficiency of frequency spectrum resources can be improved.
A first aspect of an embodiment of the present invention provides an information transmission method, including:
the base station determines first format information of Downlink Control Information (DCI) of at least one terminal in the plurality of terminals based on the number of the plurality of terminals needing data transmission, wherein the first format information comprises a scrambling identifier (SCID) and demodulation reference signals (DMRS), the scrambling identifier (SCID) is used for scrambling antenna ports, the demodulation reference signals (DMRS) correspond to different antenna ports, and DMRS sequences used by every two DMRSs are orthogonal to each other;
transmitting first format information of the DCI to at least one terminal of the plurality of terminals;
and transmitting data to at least one of the plurality of terminals by using the antenna port corresponding to the determined DMRS, so that the at least one of the plurality of terminals receives the data transmitted by the base station based on the first format information of the DCI.
A second aspect of the embodiments of the present invention provides a base station, including:
a determining unit, configured to determine, based on a number of multiple terminals that need to perform data transmission, first format information of downlink control information DCI of at least one terminal of the multiple terminals, where the first format information includes a scrambling identity SCID and a demodulation reference signal DMRS, where the scrambling identity SCID is used to scramble an antenna port, the demodulation reference signal DMRS corresponds to different antenna ports, and DMRS sequences used by every two DMRSs are orthogonal to each other;
a transmission unit configured to transmit first format information of DCI to at least one terminal among a plurality of terminals; and transmitting data to at least one of the plurality of terminals by using the antenna port corresponding to the determined DMRS, so that the at least one of the plurality of terminals receives the data transmitted by the base station based on the first format information of the DCI.
A third aspect of the present invention provides an information transmission method, including:
at least one terminal in a plurality of terminals receives first format information of Downlink Control Information (DCI) sent by a base station, wherein the first format information of the DCI is determined by the base station based on the number of the plurality of terminals needing data transmission, and the first format information comprises a scrambling identifier (SCID) and a demodulation reference signal (DMRS), wherein the scrambling identifier (SCID) is used for scrambling an antenna port, the demodulation reference signal (DMRS) corresponds to different antenna ports, and DMRS sequences used by every two DMRSs are mutually orthogonal;
and receiving data transmitted by the base station based on the first format information of the DCI.
A fourth aspect of the present invention provides a terminal, including:
a first receiving unit, configured to receive first format information of downlink control information DCI sent by a base station, where the first format information of the DCI is determined by the base station based on a number of a plurality of terminals that need to perform data transmission, and the first format information includes a scrambling identifier SCID and a demodulation reference signal DMRS, where the scrambling identifier SCID is used to scramble an antenna port, the demodulation reference signal DMRS corresponds to different antenna ports, and DMRS sequences used by every two DMRSs are orthogonal to each other;
and a second receiving unit, configured to receive data sent by the base station based on the first format information of the DCI.
The embodiment of the invention has the following beneficial effects:
by carrying the DMRS in the DCI format information, the number of ports is expanded without adding a new DCI load. And because the ports all use the DMRS sequences which are mutually orthogonal, interference does not exist between channel estimation of different terminals, the terminals can accurately obtain self channel estimation results, the transmission requirements under the MU-MIMO scene are met, and the utilization efficiency of frequency spectrum resources is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a first embodiment of a method for information transmission according to the present invention;
FIG. 2 is a flowchart illustrating a second embodiment of a method for transmitting information according to the present invention;
FIG. 3 is a flow chart illustrating a third embodiment of a method for transmitting information according to the present invention;
FIG. 4 is a schematic diagram of a first embodiment of a base station according to the present invention;
FIG. 5 is a schematic diagram of a second embodiment of a base station according to the present invention;
FIG. 6 is a schematic diagram of a third embodiment of a base station according to the present invention;
FIG. 7 is a flowchart illustrating a method for transmitting information according to a first embodiment of the present invention;
fig. 8 is a schematic composition diagram of a first embodiment of a terminal of the present invention;
fig. 9 is a schematic composition diagram of a second embodiment of a terminal of the present invention;
fig. 10 is a schematic diagram of a system architecture composed of a base station and a terminal according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminal in the embodiment of the present invention may include a smart phone (such as an Android phone, an iOS phone, a windows phone, etc.), a tablet computer, a palm computer, a notebook computer, a mobile internet device (MID for short), a wearable device, and the like, and the terminal is merely an example and is not exhaustive and includes but is not limited to the terminal.
Referring to fig. 1, a flowchart of a first embodiment of a method for transmitting information according to the present invention is shown, in which the method includes the following steps:
s101, a base station determines first format information of Downlink Control Information (DCI) of at least one terminal in a plurality of terminals based on the number of the terminals needing data transmission.
The first format information comprises a scrambling identity SCID and a demodulation reference signal DMRS, wherein the scrambling identity SCID is used for scrambling antenna ports, the demodulation reference signal DMRS corresponds to different antenna ports, and DMRS sequences used by every two DMRSs are mutually orthogonal.
S102, transmitting the first format information of the DCI to at least one of the plurality of terminals.
S103, transmitting data to at least one of the plurality of terminals by using the antenna port corresponding to the determined DMRS, so that the at least one of the plurality of terminals receives the data transmitted by the base station based on the first format information of the DCI.
In this embodiment, by carrying the DMRS in the DCI format information, the number of ports is extended without adding a new DCI payload. And because the ports all use the DMRS sequences which are mutually orthogonal, interference does not exist between channel estimation of different terminals, the terminals can accurately obtain self channel estimation results, the transmission requirements under the MU-MIMO scene are met, and the utilization efficiency of frequency spectrum resources is improved.
Referring to fig. 2, a flowchart of a first embodiment of a method for transmitting information according to the present invention is shown, in which the method includes the following steps:
s201, a base station sets DCI first format information, removes scrambling identification SCID and configures a preset table entry for carrying a demodulation reference signal DMRS in a port information table corresponding to the DCI first format information. Wherein, the DMRS comprises a port number and a DMRS sequence.
This expands the number of orthogonal ports, since the SCID is removed and the DMRS is added. And the SCIDs may then be uniformly configured to zero by the base station.
For example, for a DMRS scheme using orthogonal codes (OCC) supporting ports of 4 and 12 Resource Elements (REs).
Port for MU-MIMO OCC
Port 7 [1 1 1 1]
Port 8 [1-1 1-1]
Port 11 [1 1-1 -1]
Port 13 [1 -1 -1 1]
Port information such as port numbers, DMRS sequences and the like is configured to preset table entries in a port information table, such as table entries originally carrying SCID or other unused table entries in MU-MIMO. This implements the modification of the DCI format.
Specifically, refer to the protocol 36.212 table 5.3.3.1.5C-1 and the following table generated after setting the first format of DCI:
wherein, the right table entry is the content of the original protocol, and the left table entry is the table entry generated after the first format of the DCI is set. The original orthogonal port number is only two, and the orthogonal port number can be expanded to 4 by removing the contents in the table entries 0 and 1 carrying the SCID in the original port information table, storing the relevant information of the ports 7 and 8, such as the port number and the DMRS sequence, and replacing the contents in the table entries 2 and 3 with the relevant information of the ports 11 and 13.
S202, if the number of the terminals needing data transmission is less than or equal to four, the base station allocates different ports for each terminal, and sets SCIDs of DMRS sequences used by all the ports to be zero.
For example, when there are four terminals initiating data transmission requests at the same time, the base station may allocate port numbers to the four terminals according to the number of extended DMRS ports and the port numbers, for example, the terminal 1 uses the port 7, and the OCC sequence is [1111 ]; the terminal 2 uses a port 8, and the OCC sequence is [1-11-1 ]; the terminal 3 uses a port 11, and the OCC sequence is [11-1-1 ]; terminal 4 uses port 13 with OCC sequence 1-1-11. The DMRS sequences for the four terminals remain orthogonal to each other.
S203, the base station sends the DCI carrying the DMRS to each terminal according to the DCI first format and completes data scheduling of each terminal so that each terminal completes channel estimation and data demodulation according to the allocated port and the DMRS sequence.
After the base station sends the message to the terminal according to the first format of the DCI, the terminal firstly decodes the DCI, acquires the DCI content, obtains the DMRS port number allocated by the terminal, and then completes channel estimation and data demodulation by using the DMRS sequence. Because the four ports use orthogonal OCC sequences, interference does not exist between channel estimation of different users, and the UE can accurately obtain the self channel estimation result.
In this embodiment, by removing the SCID and carrying the DMRS in the DCI format information, the number of ports is extended without adding a new DCI load. And because the ports all use the DMRS sequences which are mutually orthogonal, interference does not exist between channel estimation of different terminals, the terminals can accurately obtain self channel estimation results, the transmission requirements under the MU-MIMO scene are met, and the utilization efficiency of frequency spectrum resources is improved.
Referring to fig. 3, a flowchart of a second embodiment of a method for transmitting information according to the present invention is shown, in which the method includes the following steps:
s301, the base station sets DCI first format information, removes scrambling identification SCID and configures a preset table entry for carrying a demodulation reference signal DMRS in a port information table corresponding to the DCI first format information. Wherein, the DMRS comprises a port number and a DMRS sequence.
This expands the number of orthogonal ports, since the SCID is removed and the DMRS is added. And the SCIDs may then be uniformly configured to zero by the base station.
For example, for a DMRS scheme using orthogonal codes (OCC) supporting ports of 4 and 12 Resource Elements (REs).
Port for MU-MIMO OCC
Port 7 [1 1 1 1]
Port 8 [1 -1 1-1]
Port 11 [1 1-1 -1]
Port 13 [1 -1 -1 1]
Port information such as port numbers, DMRS sequences and the like is configured to preset table entries in a port information table, such as table entries originally carrying SCID or other unused table entries in MU-MIMO. This implements the modification of the DCI format.
S302, if the number of the terminals needing data transmission is more than four, the base station allocates ports with mutually orthogonal DMRS sequences for the four terminals, and SCIDs of the DMRS sequences used by the four terminals are set to be zero.
And S303, for other terminals except the four terminals, the base station allocates ports for the other terminals.
Here, the same DMRS port may be allocated to other terminals than the four terminals, for example, eight terminals in total, different ports 7, 8, 11, and 13 may be sequentially allocated to the first four terminals, and the last four terminals may fixedly allocate the port 7 or any other port; different DMRS ports may be allocated to other terminals than the four terminals, for example, different ports are allocated to terminals 5 to 8, or the same port is allocated to terminals 5 and 6 and the same port is allocated to terminals 7 and 8, or the same port is allocated to terminals 5 to 7 and a different port is allocated to terminal 8, which is not limited in this embodiment of the present invention.
And S304, calculating the pseudo-orthogonal DMRS sequences of all the other terminals.
Optionally, the pseudo-orthogonal DMRS sequence is calculated according to a Radio Network Temporary Identity (RNTI) of the terminal. Because the RNTI of each terminal is different, the calculated pseudo-orthogonal DMRS sequences are different, and the calculated pseudo-orthogonal DMRS sequences can also play a role in limiting interference between terminals, so that the channel estimation performance of each terminal can be ensured.
Specifically, the pseudo-orthogonal DMRS sequence is generated according to a pseudo-random sequence initialization factor, and the pseudo-random sequence initialization factor is calculated according to the following formula:
wherein, cinitInitializing a factor, n, for a pseudorandom sequencesIs an index of a time slot and is,is a cell identification code, nRNTIA wireless network temporary identifier for the terminal;
the pseudo-orthogonal DMRS sequence is calculated according to the following formula:
r n s ( m ) = 1 2 [ 1 - 2 c * ( 2 m ) ] + j * 1 2 [ 1 - 2 c * ( 2 m + 1 ) ]
wherein,is a pseudo-orthogonal DMRS sequence, c is according to cinitA generated pseudo-random sequence, j is an imaginary part (whose value is minus 1) of the pseudo-orthogonal DMRS sequence, m is a sequence index, and indicating the number of physical blocks occupied by the physical downlink shared channel.
S305, setting DCI second format information, and configuring a Reserved (Reserved) table entry in the port information table to carry a pseudo-orthogonal DMRS sequence corresponding to the terminal identity. Specifically, reference may be made to table entry 7 in the list in the second embodiment of the information transmission method of the present invention, where table entry 7 is a reserved table entry.
S306, transmitting the second format information of the DCI to at least one terminal in the plurality of terminals so that the terminal receiving the second format information receives the data transmitted by the base station based on the allocated port and the DMRS sequence or the pseudo-orthogonal DMRS sequence corresponding to the port.
Fig. 10 is a schematic view of a system architecture composed of a base station and a terminal according to the present invention. As shown in fig. 10, at the same time, eight terminals need to perform data transmission, four users are configured in MU-MIMO mode according to the scheduling of the base station, DMRS ports 7, 8, 11, and 13 are allocated to the first four users, and the latter four users fixedly occupy port 7, and transmit DCI to the terminals through the second DCI format information by using terminal-specific pseudo-orthogonal DMRS sequences.
The base station statically configures the SCID of the DMRS sequences used by the first four terminals to be zero, and the last four ports use the terminal-specific pseudo-orthogonal DMRS sequences, so that the SCID parameters do not need to be statically configured. According to the above configuration, the terminal 1 uses the port 7, and the OCC sequence is [1111 ]; the terminal 2 uses a port 8, and the OCC sequence is [1-11-1 ]; the terminal 3 uses a port 11, and the OCC sequence is [11-1-1 ]; terminal 4 uses port 13 with OCC sequence 1-1-11. The DMRS sequences for the four terminals remain orthogonal to each other. The terminals 5-7 use port 7, the OCC sequence is [1111], and interference is limited by pseudo-orthogonal DMRS sequences between each other. At the terminal side, the terminal firstly decodes the DCI, acquires the DCI content, obtains the DMRS port number allocated by the terminal, and then completes channel estimation and subsequent data demodulation by utilizing the DMRS sequence. The first four ports use orthogonal OCC sequences, so that interference does not exist among the channel estimation of the terminals 1-4, and the terminal can accurately obtain the self channel estimation result. The terminals 5-8 limit the interference among users through the pseudo-orthogonality of the DMRS sequences, and can also ensure the performance of channel estimation.
In this embodiment, a port information table carries a specific pseudo-orthogonal DMRS sequence, and the number of ports can be further extended by using the pseudo-orthogonality, so that MIMO requirements of more users are supported, and the utilization efficiency of spectrum resources is further improved.
Referring to fig. 4, a schematic composition diagram of a base station according to a first embodiment of the present invention is shown, in which the base station includes:
a determining unit 100, configured to determine, based on a number of multiple terminals that need to perform data transmission, first format information of downlink control information DCI of at least one terminal of the multiple terminals, where the first format information includes a scrambling identifier SCID and a demodulation reference signal DMRS, where the scrambling identifier SCID is used to scramble an antenna port, the demodulation reference signal DMRS corresponds to different antenna ports, and DMRS sequences used by every two DMRSs are orthogonal to each other;
a transmitting unit 200 configured to transmit first format information of DCI to at least one terminal among a plurality of terminals; and transmitting data to at least one of the plurality of terminals by using the antenna port corresponding to the determined DMRS, so that the at least one of the plurality of terminals receives the data transmitted by the base station based on the first format information of the DCI.
The determining unit is specifically configured to set DCI first format information, remove a scrambling identifier SCID and configure a preset entry for carrying a DMRS in a port information table corresponding to the DCI first format information, where the DMRS includes a port number and a DMRS sequence;
if the number of the terminals needing data transmission is less than or equal to four, allocating different ports for each terminal, and setting SCIDs of DMRS sequences used by all the ports to be zero.
This expands the number of orthogonal ports, since the SCID is removed and the DMRS is added. And the SCIDs may then be uniformly configured to zero by the base station.
For example, for a DMRS scheme using orthogonal codes (OCC) supporting ports of 4 and 12 Resource Elements (REs).
Port for MU-MIMO OCC
Port 7 [1 1 1 1]
Port 8 [1 -1 1-1]
Port 11 [1 1 -1 -1]
Port 13 [1 -1 -1 1]
Port information such as port numbers, DMRS sequences and the like is configured to preset table entries in a port information table, such as table entries originally carrying SCID or other unused table entries in MU-MIMO. This implements the modification of the DCI format.
For example, when there are four terminals initiating data transmission requests at the same time, the base station may allocate port numbers to the four terminals according to the number of extended DMRS ports and the port numbers, for example, the terminal 1 uses the port 7, and the OCC sequence is [1111 ]; the terminal 2 uses a port 8, and the OCC sequence is [1-11-1 ]; the terminal 3 uses a port 11, and the OCC sequence is [11-1-1 ]; terminal 4 uses port 13 with OCC sequence 1-1-11. The DMRS sequences for the four terminals remain orthogonal to each other.
After the base station sends the message to the terminal according to the first format information of the DCI, the terminal firstly decodes the DCI, acquires the DCI content, obtains the DMRS port number allocated by the terminal, and then completes channel estimation and data demodulation by using the DMRS sequence. Because the four ports use orthogonal OCC sequences, interference does not exist between channel estimation of different users, and the UE can accurately obtain the self channel estimation result.
By removing the SCID and carrying the DMRS port information in the table entry preset in the port information table, the number of the DMRS ports is expanded on the premise of not increasing a new DCI load. And because the ports use the DMRS sequences which are orthogonal with each other, interference does not exist between channel estimation of different terminals, the terminals can accurately obtain self channel estimation results, the transmission requirements under the MU-MIMO scene are met, and the utilization efficiency of frequency spectrum resources is improved.
Referring to fig. 5, a schematic composition diagram of a base station according to a second embodiment of the present invention is shown, in which the base station includes:
a determining unit 100, configured to determine, based on a number of multiple terminals that need to perform data transmission, first format information of downlink control information DCI of at least one terminal of the multiple terminals, where the first format information includes a scrambling identifier SCID and a demodulation reference signal DMRS, where the scrambling identifier SCID is used to scramble an antenna port, the demodulation reference signal DMRS corresponds to different antenna ports, and DMRS sequences used by every two DMRSs are orthogonal to each other;
a transmitting unit 200 configured to transmit first format information of DCI to at least one terminal among a plurality of terminals; and transmitting data to at least one of the plurality of terminals by using the antenna port corresponding to the determined DMRS, so that the at least one of the plurality of terminals receives the data transmitted by the base station based on the first format information of the DCI.
The determining unit 100 is specifically configured to set DCI first format information, remove a scrambling identifier SCID from a port information table corresponding to the DCI first format information, and configure a preset table entry for carrying a DMRS, where the DMRS includes a port number and a DMRS sequence;
if the number of the terminals needing data transmission is less than or equal to four, allocating different ports for each terminal, and setting SCIDs of DMRS sequences used by all the ports to be zero.
This expands the number of orthogonal ports, since the SCID is removed and the DMRS is added. And the SCIDs may then be uniformly configured to zero by the base station.
For example, for a DMRS scheme using orthogonal codes (OCC) supporting ports of 4 and 12 Resource Elements (REs).
Port for MU-MIMO OCC
Port 7 [1 1 1 1]
Port 8 [1 -1 1 -1]
Port 11 [1 1 -1 -1]
Port 13 [1 -1 -1 1]
Port information such as port numbers, DMRS sequences and the like is configured to preset table entries in a port information table, such as table entries originally carrying SCID or other unused table entries in MU-MIMO. This implements the modification of the DCI format.
For example, when there are four terminals initiating data transmission requests at the same time, the base station may allocate port numbers to the four terminals according to the number of extended DMRS ports and the port numbers, for example, the terminal 1 uses the port 7, and the OCC sequence is [1111 ]; the terminal 2 uses a port 8, and the OCC sequence is [1-11-1 ]; the terminal 3 uses a port 11, and the OCC sequence is [11-1-1 ]; terminal 4 uses port 13 with OCC sequence 1-1-11. The DMRS sequences for the four terminals remain orthogonal to each other.
After the base station sends the message to the terminal according to the first format information of the DCI, the terminal firstly decodes the DCI, acquires the DCI content, obtains the DMRS port number allocated by the terminal, and then completes channel estimation and data demodulation by using the DMRS sequence. Because the four ports use orthogonal OCC sequences, interference does not exist between channel estimation of different users, and the UE can accurately obtain the self channel estimation result.
If the number of terminals requiring data transmission is greater than four, the determining unit 100 is configured to allocate ports with DMRS sequences orthogonal to each other to four terminals, and set SCIDs of the DMRS sequences used by the four terminals to be zero;
for other terminals than the four terminals, the determining unit 100 is further configured to allocate ports to the other terminals;
the base station further comprises a calculating unit 300, wherein the calculating unit 300 is configured to calculate a pseudo-orthogonal DMRS sequence for each of the other terminals;
the determining unit 100 is further configured to set DCI second format information, configure a reserved table entry in the port information table to carry a pseudo-orthogonal DMRS sequence corresponding to a terminal identity;
the transmitting unit 300 is further configured to transmit the second format information of the DCI to at least one terminal of the plurality of terminals, so that the terminal receiving the second format information receives the data transmitted by the transmitting unit based on the allocated port and the DMRS sequence or pseudo-orthogonal DMRS sequence corresponding to the port.
Here, the same DMRS port may be allocated to other terminals than the four terminals, for example, eight terminals in total, different ports 7, 8, 11, and 13 may be sequentially allocated to the first four terminals, and the last four terminals may fixedly allocate the port 7 or any other port; different DMRS ports may be allocated to other terminals than the four terminals, for example, different ports are allocated to terminals 5 to 8, or the same port is allocated to terminals 5 and 6 and the same port is allocated to terminals 7 and 8, or the same port is allocated to terminals 5 to 7 and a different port is allocated to terminal 8, which is not limited in this embodiment of the present invention.
And the pseudo-orthogonal DMRS sequence is obtained by calculation according to the wireless network temporary identifier of the terminal.
The pseudo-orthogonal DMRS sequence is specifically generated according to a pseudo-random sequence initialization factor, and the calculating unit 300 is specifically configured to calculate the pseudo-random sequence initialization factor according to the following formula:
wherein, cinitInitializing a factor, n, for a pseudorandom sequencesIs an index of a time slot and is,is a cell identification code, nRNTIA wireless network temporary identifier for the terminal;
the calculating unit 300 is specifically configured to calculate a pseudo-orthogonal DMRS sequence according to the following formula:
r n s ( m ) = 1 2 [ 1 - 2 c * ( 2 m ) ] + j * 1 2 [ 1 - 2 c * ( 2 m + 1 ) ]
wherein,is a pseudo-orthogonal DMRS sequence, c is according to cinitThe generated pseudo-random sequence, j is the imaginary part of the pseudo-orthogonal DMRS sequence, m is the sequence index, and indicating the number of physical blocks occupied by the physical downlink shared channel.
Fig. 10 is a schematic view of a system architecture composed of a base station and a terminal according to the present invention. As shown in fig. 10, at the same time, eight terminals need to perform data transmission, four users are configured in MU-MIMO mode according to the scheduling of the base station, DMRS ports 7, 8, 11, and 13 are allocated to the first four users, the latter four users fixedly occupy port 7, and the DCI is transmitted to the terminals through the second DCI format by using terminal-specific pseudo-orthogonal DMRS sequences.
The base station statically configures the SCID of the DMRS sequences used by the first four terminals to be zero, and the last four ports use the terminal-specific pseudo-orthogonal DMRS sequences, so that the SCID parameters do not need to be statically configured. According to the above configuration, the terminal 1 uses the port 7, and the OCC sequence is [1111 ]; the terminal 2 uses a port 8, and the OCC sequence is [1-11-1 ]; the terminal 3 uses a port 11, and the OCC sequence is [11-1-1 ]; terminal 4 uses port 13 with OCC sequence 1-1-11. The DMRS sequences for the four terminals remain orthogonal to each other. The terminals 5-7 use port 7, the OCC sequence is [1111], and interference is limited by pseudo-orthogonal DMRS sequences between each other. At the terminal side, the terminal firstly decodes the DCI, acquires the DCI content, obtains the DMRS port number allocated by the terminal, and then completes channel estimation and subsequent data demodulation by utilizing the DMRS sequence. The first four ports use orthogonal OCC sequences, so that interference does not exist among the channel estimation of the terminals 1-4, and the terminal can accurately obtain the self channel estimation result. The terminals 5-8 limit the interference among users through the pseudo-orthogonality of the DMRS sequences, and can also ensure the performance of channel estimation.
In this embodiment, a port information table carries a specific pseudo-orthogonal DMRS sequence, and the number of ports can be further extended by using the pseudo-orthogonality, so that MIMO requirements of more users are supported, and the utilization efficiency of spectrum resources is further improved.
Referring to fig. 6, a schematic composition diagram of a base station according to a third embodiment of the present invention is shown, in which the base station includes:
the device comprises a processor 1101, an interface circuit 1102, a memory 1103 and a bus 1104, wherein the processor 1101, the interface circuit 1102 and the memory 1103 are connected through the bus 1104 and complete mutual communication, the memory 1103 stores a set of program codes, and the processor 1101 is used for calling the program codes stored in the memory 1103 and executing the following operations:
determining first format information of Downlink Control Information (DCI) of at least one terminal in a plurality of terminals based on the number of the terminals needing data transmission, wherein the first format information comprises a scrambling identifier (SCID) and demodulation reference signals (DMRS), the scrambling identifier (SCID) is used for scrambling antenna ports, the demodulation reference signals (DMRS) correspond to different antenna ports, and DMRS sequences used by every two DMRSs are orthogonal to each other;
transmitting first format information of DCI to at least one terminal of a plurality of terminals through an interface circuit 1102; and transmitting data to at least one of the plurality of terminals by using the antenna port corresponding to the determined DMRS, so that the at least one of the plurality of terminals receives the data transmitted by the base station based on the first format information of the DCI.
Optionally, the processor 1101 is specifically configured to:
setting DCI first format information, removing a scrambling identification (SCID) and configuring a preset table entry for carrying a DMRS (demodulation reference signal) in a port information table corresponding to the DCI first format information, wherein the DMRS comprises a port number and a DMRS sequence;
if the number of the terminals needing data transmission is less than or equal to four, allocating different ports for each terminal, and setting SCIDs of DMRS sequences used by all the ports to be zero.
Optionally, if the number of terminals that need to perform data transmission is greater than four, the processor 1101 is further configured to:
allocating ports with DMRS sequences orthogonal to each other for four terminals, and setting SCIDs of the DMRS sequences used by the four terminals to be zero;
for other terminals except the four terminals, distributing ports for the other terminals;
calculating pseudo-orthogonal DMRS sequences of all the other terminals;
setting DCI second format information, and configuring a reserved table entry in the port information table to carry a pseudo-orthogonal DMRS sequence corresponding to the terminal identity;
and transmitting the second format information of the DCI to at least one terminal of the plurality of terminals through the interface circuit 1102 so that the terminal receiving the second format information receives the data transmitted by the base station based on the allocated port and the DMRS sequence or pseudo-orthogonal DMRS sequence corresponding to the port.
Optionally, the DMRS ports include port 7, port 8, port 11, and port 13.
And the pseudo-orthogonal DMRS sequence is obtained by calculation according to the wireless network temporary identifier of the terminal.
The pseudo-orthogonal DMRS sequence is specifically generated according to a pseudo-random sequence initialization factor, and the processor 1101 is specifically configured to calculate the pseudo-random sequence initialization factor according to the following formula:
wherein, cinitInitializing a factor, n, for a pseudorandom sequencesIs an index of a time slot and is,is a cell identification code, nRNTIA wireless network temporary identifier for the terminal;
the processor 1101 is specifically configured to calculate a pseudo-orthogonal DMRS sequence according to the following formula:
r n s ( m ) = 1 2 [ 1 - 2 c * ( 2 m ) ] + j * 1 2 [ 1 - 2 c * ( 2 m + 1 ) ]
wherein,is a pseudo-orthogonal DMRS sequence, c is according to cinitThe generated pseudo-random sequence, j is the imaginary part of the pseudo-orthogonal DMRS sequence, m is the sequence index, and indicating the number of physical blocks occupied by the physical downlink shared channel.
Here, the processor 1101 may be a single processor or may be a general term for a plurality of processing elements. For example, the processor may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention, such as: one or more microprocessors (DSP for short), or one or more field programmable gate arrays (FPGA for short).
The memory 1103 may be a storage device or a combination of storage elements, and is used for storing executable program codes or parameters, data, etc. required by the operation of the base station. And the memory 1103 may include a Random Access Memory (RAM) and may also include a non-volatile memory (non-volatile), such as a magnetic disk memory, Flash memory (Flash), and the like.
The bus 1104 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus 1104 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 5, but this is not intended to represent only one bus or type of bus.
In addition, the interface circuit 1102 may be further connected to a radio frequency part of the base station to enable communication with the terminal through the radio frequency part.
Fig. 7 is a flowchart illustrating a first embodiment of an information transmission method according to the present invention, wherein the method includes:
s701, at least one terminal among the plurality of terminals receives first format information of downlink control information DCI transmitted by the base station.
The first format information of the DCI is determined by the base station based on the number of a plurality of terminals needing data transmission, and comprises a scrambling identification (SCID) and a demodulation reference signal (DMRS), wherein the scrambling identification (SCID) is used for scrambling antenna ports, the demodulation reference signal (DMRS) corresponds to different antenna ports, and DMRS sequences used by every two DMRSs are orthogonal to each other.
S702, receiving data sent by the base station based on the first format information of the DCI.
If the number of terminals requiring data transmission is less than or equal to four, the receiving the data sent by the base station based on the first format information of the DCI includes:
receiving first format information sent by the base station;
acquiring the DMRS contained in the first format information, and determining a port corresponding to the DMRS and a DMRS sequence;
and performing channel estimation and receiving data sent by the base station according to the port corresponding to the DMRS and the DMRS sequence.
If the number of the terminals needing data transmission is more than four, the method further comprises the following steps:
acquiring a port which is allocated by a base station and corresponds to a DMRS sequence and has a SCID of the DMRS sequence of zero, and performing channel estimation and receiving data transmitted by the base station according to the allocated port and the DMRS sequence;
or
Receiving second format information of DCI sent by a base station, wherein a reserved table entry in a port information table corresponding to the DCI second format information is used for carrying a pseudo-orthogonal DMRS sequence corresponding to a terminal identity, acquiring a port corresponding to the pseudo-orthogonal DMRS sequence allocated by the base station, and receiving data sent by the base station according to the allocated port and the pseudo-orthogonal DMRS sequence.
Referring to fig. 8, a schematic composition diagram of a terminal according to a first embodiment of the present invention is shown, in which the terminal includes:
a first receiving unit 400, configured to receive first format information of downlink control information DCI sent by a base station, where the first format information of the DCI is determined by the base station based on a number of a plurality of terminals that need to perform data transmission, and the first format information includes a scrambling identifier SCID and a demodulation reference signal DMRS, where the scrambling identifier SCID is used to scramble an antenna port, the demodulation reference signal DMRS corresponds to different antenna ports, and DMRS sequences used by every two DMRSs are orthogonal to each other;
a second receiving unit 500, configured to receive data sent by the base station based on the first format information of the DCI.
If the number of terminals that need to perform data transmission is less than or equal to four, the first receiving unit 400 is specifically configured to:
receiving first format information sent by the base station;
acquiring the DMRS contained in the first format information, and determining a port corresponding to the DMRS and a DMRS sequence;
the second receiving unit 500 is specifically configured to perform channel estimation according to the port corresponding to the DMRS and the DMRS sequence, and receive data sent by the base station.
If the number of terminals that need to perform data transmission is greater than four, the first receiving unit 400 is specifically configured to:
acquiring a port which is allocated by a base station and corresponds to a DMRS sequence and the SCID of the DMRS sequence is zero;
the second receiving unit 500 is specifically configured to perform channel estimation according to the allocated port and the DMRS sequence and receive data sent by the base station;
or
The first receiving unit 400 is configured to receive second format information of DCI sent by a base station, where a reserved entry in a port information table corresponding to the second format information of DCI is used to carry a pseudo-orthogonal DMRS sequence corresponding to a terminal identity, and obtain a port of the corresponding pseudo-orthogonal DMRS sequence allocated by the base station;
the second receiving unit 500 is configured to receive data transmitted by the base station according to the allocated port and the pseudo-orthogonal DMRS sequence.
Referring to fig. 9, a schematic composition diagram of a second embodiment of a terminal according to the present invention is shown, in this embodiment, the terminal includes:
the processor 2101, the first interface circuit 2102, the second interface circuit 2103, the memory 2104 and the bus 2105, wherein the processor 2101, the first interface circuit 2102, the second interface circuit 2103 and the memory 2104 are connected through the bus 2105 and perform communication with each other, a set of program codes is stored in the memory 2104, and the processor 2101 is configured to call the program codes stored in the memory 2104 and perform the following operations:
receiving, by a first interface circuit 2102, first format information of downlink control information DCI sent by a base station, where the first format information of DCI is determined by the base station based on the number of a plurality of terminals that need to perform data transmission, and the first format information includes a scrambling identifier SCID and a demodulation reference signal DMRS, where the scrambling identifier SCID is used to scramble an antenna port, the demodulation reference signal DMRS corresponds to different antenna ports, and DMRS sequences used by every two DMRSs are orthogonal to each other;
receiving, by the second interface circuit 2103, data transmitted by the base station based on the first format information of the DCI.
If the number of terminals requiring data transmission is less than or equal to four, the processor 2101 is configured to:
receiving, by a first interface circuit 2102, first format information transmitted by the base station;
acquiring the DMRS contained in the first format information, and determining a port corresponding to the DMRS and a DMRS sequence;
and performing channel estimation and receiving data sent by the base station through a second interface circuit 2103 according to the port corresponding to the DMRS and the DMRS sequence.
If the number of terminals requiring data transmission is greater than four, the processor 2101 is configured to:
acquiring a port which is allocated by a base station and corresponds to a DMRS sequence and has a SCID of the DMRS sequence of zero through a first interface circuit 2102, and performing channel estimation and receiving data transmitted by the base station through a second interface circuit 2103 according to the allocated port and the DMRS sequence;
or
Receiving second format information of DCI sent by a base station through a first interface circuit, wherein a reserved table entry in a port information table corresponding to the DCI second format information is used for carrying a pseudo-orthogonal DMRS sequence corresponding to a terminal identity, acquiring a port corresponding to the pseudo-orthogonal DMRS sequence allocated by the base station, and receiving data sent by the base station through a second interface circuit 2103 according to the allocated port and the pseudo-orthogonal DMRS sequence.
Here, the processor 1101 may be a single processor or may be a general term for a plurality of processing elements. For example, the processor may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention, such as: one or more microprocessors (DSP for short), or one or more field programmable gate arrays (FPGA for short).
The memory 1103 may be a storage device or a combination of storage elements, and is used for storing executable program codes or parameters, data, etc. required by the operation of the base station. And the memory 1103 may include a Random Access Memory (RAM) and may also include a non-volatile memory (non-volatile), such as a magnetic disk memory, Flash memory (Flash), and the like.
The bus 1104 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus 1104 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 5, but this is not intended to represent only one bus or type of bus.
Referring to fig. 9, a schematic diagram of a system architecture composed of a base station and a terminal according to the present invention is shown.
The base station is used for determining first format information of Downlink Control Information (DCI) of at least one terminal in a plurality of terminals based on the number of the terminals needing data transmission, wherein the first format information comprises a scrambling identifier (SCID) and a demodulation reference signal (DMRS), the scrambling identifier (SCID) is used for scrambling antenna ports, the demodulation reference signal (DMRS) corresponds to different antenna ports, and DMRS sequences used by every two DMRSs are mutually orthogonal;
transmitting first format information of the DCI to at least one terminal of the plurality of terminals;
and transmitting data to at least one of the plurality of terminals by using the antenna port corresponding to the determined DMRS, so that the at least one of the plurality of terminals receives the data transmitted by the base station based on the first format information of the DCI.
The method specifically comprises the following steps: setting DCI first format information, removing a scrambling identification (SCID) and configuring a preset table entry for carrying a DMRS (demodulation reference signal) in a port information table corresponding to the DCI first format information, wherein the DMRS comprises a port number and a DMRS sequence;
and if the number of the terminals needing data transmission is less than or equal to four, the base station allocates different ports for each terminal, and sets SCIDs of DMRS sequences used by all the ports to be zero. If the number of the terminals needing data transmission is more than four, the base station allocates ports with mutually orthogonal DMRS sequences for the four terminals, and SCIDs of the DMRS sequences used by the four terminals are set to be zero;
for other terminals except the four terminals, the base station allocates ports for the other terminals;
calculating pseudo-orthogonal DMRS sequences of all the other terminals;
setting DCI second format information, and configuring a reserved table entry in the port information table to carry a pseudo-orthogonal DMRS sequence corresponding to the terminal identity;
and transmitting the second format information of the DCI to at least one terminal in the plurality of terminals so that the terminal receiving the second format information receives the data transmitted by the base station based on the allocated port and the DMRS sequence or the pseudo-orthogonal DMRS sequence corresponding to the port.
Optionally, the DMRS ports include port 7, port 8, port 11, and port 13.
And the pseudo-orthogonal DMRS sequence is obtained by calculation according to the wireless network temporary identifier of the terminal.
The pseudo-orthogonal DMRS sequence is specifically generated according to a pseudo-random sequence initialization factor, and the pseudo-random sequence initialization factor is calculated according to the following formula:
wherein, cinitInitializing a factor, n, for a pseudorandom sequencesIs an index of a time slot and is,is a cell identification code, nRNTIA wireless network temporary identifier for the terminal;
the pseudo-orthogonal DMRS sequence is calculated according to the following formula:
r n s ( m ) = 1 2 [ 1 - 2 c * ( 2 m ) ] + j * 1 2 [ 1 - 2 c * ( 2 m + 1 ) ]
wherein,is a pseudo-orthogonal DMRS sequence, c is according to cinitThe generated pseudo-random sequence, j is the imaginary part of the pseudo-orthogonal DMRS sequence, m is the sequence index, and indicating the number of physical blocks occupied by the physical downlink shared channel.
The terminal is used for receiving first format information of Downlink Control Information (DCI) sent by a base station, wherein the first format information of the DCI is determined by the base station based on the number of a plurality of terminals needing data transmission, and the first format information comprises a scrambling identifier (SCID) and a demodulation reference signal (DMRS), wherein the scrambling identifier (SCID) is used for scrambling antenna ports, the demodulation reference signal (DMRS) corresponds to different antenna ports, and DMRS sequences used by every two DMRSs are orthogonal to each other;
and receiving data transmitted by the base station based on the first format information of the DCI.
Receiving DCI sent by a base station, decoding the DCI, acquiring DCI content, obtaining a DMRS port number allocated by the terminal, and then completing channel estimation and data demodulation by using the DMRS sequence.
If the number of the terminals needing data transmission is less than or equal to four, the terminals are used for receiving first format information sent by the base station;
acquiring the DMRS contained in the first format information, and determining a port corresponding to the DMRS and a DMRS sequence;
and performing channel estimation and receiving data sent by the base station according to the port corresponding to the DMRS and the DMRS sequence.
If the number of terminals needing data transmission is more than four, the terminals are used for:
acquiring a port which is allocated by a base station and corresponds to a DMRS sequence and has a SCID of the DMRS sequence of zero, and performing channel estimation and receiving data transmitted by the base station according to the allocated port and the DMRS sequence;
or
Receiving second format information of DCI sent by a base station, wherein a reserved table entry in a port information table corresponding to the DCI second format information is used for carrying a pseudo-orthogonal DMRS sequence corresponding to a terminal identity, acquiring a port corresponding to the pseudo-orthogonal DMRS sequence allocated by the base station, and receiving data sent by the base station according to the allocated port and the pseudo-orthogonal DMRS sequence.
By carrying the DMRS in the DCI format information, the number of ports is expanded without adding a new DCI load. Because the ports all use the DMRS sequences which are mutually orthogonal, interference does not exist between channel estimation of different terminals, the terminals can accurately obtain self channel estimation results, the transmission requirements under the MU-MIMO scene are met, and the utilization efficiency of frequency spectrum resources is improved; and by carrying the specific pseudo-orthogonal DMRS sequences in the port information table, the number of ports can be further expanded by utilizing the pseudo-orthogonality, the MIMO requirements of more users are supported, and the utilization efficiency of frequency spectrum resources is further improved.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The units in the terminal of the embodiment of the invention can be merged, divided and deleted according to actual needs.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a Random Access Memory (RAM), or the like.
The method, the base station and the terminal for information transmission provided by the embodiment of the present invention are described in detail above, and a specific example is applied in the description to explain the principle and the embodiment of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (16)

1. A method of information transmission, comprising:
the base station determines first format information of Downlink Control Information (DCI) of at least one terminal in the plurality of terminals based on the number of the plurality of terminals needing data transmission, wherein the first format information comprises a scrambling identifier (SCID) and demodulation reference signals (DMRS), the scrambling identifier (SCID) is used for scrambling antenna ports, the demodulation reference signals (DMRS) correspond to different antenna ports, and DMRS sequences used by every two DMRSs are orthogonal to each other;
transmitting first format information of the DCI to at least one terminal of the plurality of terminals;
and transmitting data to at least one of the plurality of terminals by using the antenna port corresponding to the determined DMRS, so that the at least one of the plurality of terminals receives the data transmitted by the base station based on the first format information of the DCI.
2. The method of claim 1, wherein the determining, by the base station, format information of Downlink Control Information (DCI) of at least one of the plurality of terminals based on the number of the plurality of terminals that need to perform data transmission comprises:
setting DCI first format information by a base station, removing a scrambling identification (SCID) and configuring a preset table entry for carrying a DMRS (demodulation reference signal) in a port information table corresponding to the DCI first format information, wherein the DMRS comprises a port number and a DMRS sequence;
and if the number of the terminals needing data transmission is less than or equal to four, the base station allocates different ports for each terminal, and sets SCIDs of DMRS sequences used by all the ports to be zero.
3. The method of claim 2, wherein if the number of terminals requiring data transmission is greater than four, the base station allocates ports, in which DMRS sequences are orthogonal to each other, to four of the terminals, and sets SCIDs of the DMRS sequences used by the four terminals to zero;
for other terminals except the four terminals, the base station allocates ports for the other terminals;
calculating pseudo-orthogonal DMRS sequences of all the other terminals;
setting DCI second format information, and configuring a reserved table entry in the port information table to carry a pseudo-orthogonal DMRS sequence corresponding to the terminal identity;
and transmitting the second format information of the DCI to at least one terminal in the plurality of terminals so that the terminal receiving the second format information receives the data transmitted by the base station based on the allocated port and the DMRS sequence or the pseudo-orthogonal DMRS sequence corresponding to the port.
4. The method of claim 3, wherein the pseudo-orthogonal DMRS sequences are calculated from a radio network temporary identity of a terminal.
5. The method according to claim 3 or 4, wherein the pseudo-orthogonal DMRS sequences are generated in particular from a pseudo-random sequence initialization factor, which is calculated according to the following formula:
wherein, cinitInitializing a factor, n, for a pseudorandom sequencesIs an index of a time slot and is,is a cell identification code, nRNTIA wireless network temporary identifier for the terminal;
the pseudo-orthogonal DMRS sequence is calculated according to the following formula:
r n s ( m ) = 1 2 [ 1 - 2 c * ( 2 m ) ] + j * 1 2 [ 1 - 2 c * ( 2 m + 1 ) ]
wherein,(m) is a pseudo-orthogonal DMRS sequence, c is according to cinitThe generated pseudo-random sequence, j is the imaginary part of the pseudo-orthogonal DMRS sequence, m is the sequence index, andindicating the number of physical blocks occupied by the physical downlink shared channel.
6. A base station, comprising:
a determining unit, configured to determine, based on a number of multiple terminals that need to perform data transmission, first format information of downlink control information DCI of at least one terminal of the multiple terminals, where the first format information includes a scrambling identity SCID and a demodulation reference signal DMRS, where the scrambling identity SCID is used to scramble an antenna port, the demodulation reference signal DMRS corresponds to different antenna ports, and DMRS sequences used by every two DMRSs are orthogonal to each other;
a transmission unit configured to transmit first format information of DCI to at least one terminal among a plurality of terminals; and transmitting data to at least one of the plurality of terminals by using the antenna port corresponding to the determined DMRS, so that the at least one of the plurality of terminals receives the data transmitted by the base station based on the first format information of the DCI.
7. The base station of claim 6, wherein the determining unit is specifically configured to:
setting DCI first format information, removing a scrambling identification (SCID) and configuring a preset table entry for carrying a DMRS (demodulation reference signal) in a port information table corresponding to the DCI first format information, wherein the DMRS comprises a port number and a DMRS sequence;
if the number of the terminals needing data transmission is less than or equal to four, allocating different ports for each terminal, and setting SCIDs of DMRS sequences used by all the ports to be zero.
8. The base station according to claim 7, wherein if the number of terminals requiring data transmission is greater than four, the determining unit is configured to allocate ports, in which DMRS sequences are orthogonal to each other, to four of the terminals, and set SCIDs of the DMRS sequences used by the four terminals to zero;
for other terminals than the four terminals, the determining unit is further configured to allocate ports to the other terminals;
the base station further comprises a calculating unit, wherein the calculating unit is used for calculating the pseudo-orthogonal DMRS sequences of all the other terminals;
the determining unit is further configured to set DCI second format information, configure a reserved table entry in the port information table to carry a pseudo-orthogonal DMRS sequence corresponding to a terminal identity;
the transmitting unit is further configured to transmit second format information of the DCI to at least one terminal of the plurality of terminals, so that the terminal receiving the second format information receives the data transmitted by the transmitting unit based on the allocated port and the DMRS sequence or pseudo-orthogonal DMRS sequence corresponding to the port.
9. The base station of claim 8, wherein the pseudo-orthogonal DMRS sequences are calculated from a radio network temporary identity of a terminal.
10. The base station according to claim 8 or 9, wherein the pseudo-orthogonal DMRS sequences are generated according to a pseudo-random sequence initialization factor, and the calculating unit is specifically configured to calculate the pseudo-random sequence initialization factor according to the following formula:
wherein, cinitInitializing a factor, n, for a pseudorandom sequencesIs an index of a time slot and is,is a cell identification code, nRNTIA wireless network temporary identifier for the terminal;
the calculating unit is specifically configured to calculate and obtain the pseudo-orthogonal DMRS sequence according to the following formula:
r n s ( m ) = 1 2 [ 1 - 2 c * ( 2 m ) ] + j * 1 2 [ 1 - 2 c * ( 2 m + 1 ) ]
wherein,(m) is a pseudo-orthogonal DMRS sequence, c is according to cinitThe generated pseudo-random sequence, j is the imaginary part of the pseudo-orthogonal DMRS sequence, m is the sequence index, andphysical block representing physical downlink shared channel occupationNumber of the cells.
11. A method of information transmission, comprising:
at least one terminal in a plurality of terminals receives first format information of Downlink Control Information (DCI) sent by a base station, wherein the first format information of the DCI is determined by the base station based on the number of the plurality of terminals needing data transmission, and the first format information comprises a scrambling identifier (SCID) and a demodulation reference signal (DMRS), wherein the scrambling identifier (SCID) is used for scrambling an antenna port, the demodulation reference signal (DMRS) corresponds to different antenna ports, and DMRS sequences used by every two DMRSs are mutually orthogonal;
and receiving data transmitted by the base station based on the first format information of the DCI.
12. The method of claim 11, wherein if the number of terminals requiring data transmission is less than or equal to four, the receiving data sent by the base station based on the first format information of the DCI comprises:
receiving first format information sent by the base station;
acquiring the DMRS contained in the first format information, and determining a port corresponding to the DMRS and a DMRS sequence;
and performing channel estimation and receiving data sent by the base station according to the port corresponding to the DMRS and the DMRS sequence.
13. The method of claim 11, wherein if the number of terminals requiring data transmission is greater than four, the method further comprises:
acquiring a port which is allocated by a base station and corresponds to a DMRS sequence and has a SCID of the DMRS sequence of zero, and performing channel estimation and receiving data transmitted by the base station according to the allocated port and the DMRS sequence;
or
Receiving second format information of DCI sent by a base station, wherein a reserved table entry in a port information table corresponding to the DCI second format information is used for carrying a pseudo-orthogonal DMRS sequence corresponding to a terminal identity, acquiring a port corresponding to the pseudo-orthogonal DMRS sequence allocated by the base station, and receiving data sent by the base station according to the allocated port and the pseudo-orthogonal DMRS sequence.
14. A terminal, comprising:
a first receiving unit, configured to receive first format information of downlink control information DCI sent by a base station, where the first format information of the DCI is determined by the base station based on a number of a plurality of terminals that need to perform data transmission, and the first format information includes a scrambling identifier SCID and a demodulation reference signal DMRS, where the scrambling identifier SCID is used to scramble an antenna port, the demodulation reference signal DMRS corresponds to different antenna ports, and DMRS sequences used by every two DMRSs are orthogonal to each other;
and a second receiving unit, configured to receive data sent by the base station based on the first format information of the DCI.
15. The terminal of claim 14, wherein if the number of terminals requiring data transmission is less than or equal to four, the first receiving unit is specifically configured to:
receiving first format information sent by the base station;
acquiring the DMRS contained in the first format information, and determining a port corresponding to the DMRS and a DMRS sequence;
the second receiving unit is specifically configured to perform channel estimation according to the port corresponding to the DMRS and the DMRS sequence, and receive data sent by the base station.
16. The terminal of claim 14, wherein if the number of terminals requiring data transmission is greater than four, the first receiving unit is specifically configured to:
acquiring a port which is allocated by a base station and corresponds to a DMRS sequence and the SCID of the DMRS sequence is zero;
the second receiving unit is specifically configured to perform channel estimation according to the allocated port and the DMRS sequence and receive data sent by the base station;
or
The first receiving unit is used for receiving second format information of DCI sent by the base station, and a reserved table entry in a port information table corresponding to the DCI second format information is used for carrying a pseudo-orthogonal DMRS sequence corresponding to the terminal identity and acquiring a port corresponding to the pseudo-orthogonal DMRS sequence allocated by the base station;
and the second receiving unit is used for receiving the data sent by the base station according to the allocated port and the pseudo-orthogonal DMRS sequence.
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WO2018050088A1 (en) * 2016-09-19 2018-03-22 中兴通讯股份有限公司 Method and device for increasing data forming gain, base station and communication system
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