CN110719151A

CN110719151A - Method and equipment for determining demodulation reference signal parameters of uplink data channel

Info

Publication number: CN110719151A
Application number: CN201810759491.6A
Authority: CN
Inventors: 邢艳萍
Original assignee: Telecommunications Science and Technology Research Institute Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2018-07-11
Filing date: 2018-07-11
Publication date: 2020-01-21
Anticipated expiration: 2038-07-11
Also published as: CN110719151B; WO2020011079A1

Abstract

The embodiment of the invention provides a method and equipment for determining demodulation reference signal parameters of an uplink data channel, wherein terminals independently select DMRS parameters adopted by the terminals from DMRS resource pools, so that the probability that different terminals adopt the same DMRS ports to transmit DMRS can be reduced, the probability of pilot frequency collision is reduced, and the reliability of data transmission is improved.

Description

Method and equipment for determining demodulation reference signal parameters of uplink data channel

Technical Field

The invention relates to the technical field of mobile communication, in particular to a method and equipment for determining Demodulation Reference Signal (DMRS) parameters of an uplink data channel.

Background

Currently, non-orthogonal multiple access transmission techniques are being studied in new air interface (NR) systems, i.e. signals of different terminals (UE) can be multiplexed for transmission on the same time-frequency resource. When different terminals use the same DMRS port and transmit uplink data channels on the same time-frequency resource, pilot collisions may occur, and data transmission performance is affected, so a solution is urgently needed to reduce or avoid the above problems to a certain extent.

Disclosure of Invention

The technical problem to be solved in the embodiments of the present invention is to provide a method and a device for determining demodulation reference signal parameters of an uplink data channel, which can reduce or avoid pilot collision of different terminals and improve data transmission performance.

In order to solve the above technical problem, an embodiment of the present invention provides a method for determining a DMRS parameter of an uplink data channel, including:

when a terminal performs initial transmission of an uplink data channel, transmitting DMRS by using a first DMRS parameter, wherein the first DMRS parameter is selected from a pre-obtained DMRS resource pool, the DMRS resource pool comprises at least one DMRS parameter, and the DMRS parameter comprises a DMRS port and/or a DMRS sequence.

The embodiment of the invention also provides another method for determining the DMRS parameters of the demodulation reference signals of the uplink data channels, which comprises the following steps:

the base station receives an uplink data channel initially transmitted by a first terminal and determines DMRS parameters adopted by the first terminal when the uplink data channel is initially transmitted, wherein the adopted DMRS parameters are selected by the first terminal from a pre-obtained DMRS resource pool, the DMRS resource pool comprises at least one DMRS parameter, and the DMRS parameters comprise DMRS ports and/or DMRS sequences;

and the base station distinguishes the uplink data channel transmitted by the first terminal according to the DMRS parameter of the DMRS sent by the first terminal and estimates the uplink data channel of the first terminal according to the received DMRS.

An embodiment of the present invention further provides a terminal, including: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor; it is characterized in that the preparation method is characterized in that,

the transceiver is used for transmitting the DMRS by adopting a first DMRS parameter when the initial transmission of an uplink data channel is carried out, wherein the first DMRS parameter is selected from a pre-obtained DMRS resource pool, and the DMRS parameter comprises a DMRS port and/or a DMRS sequence.

The embodiment of the invention also provides another terminal, which comprises:

the base station comprises a transmitting unit and a receiving unit, wherein the transmitting unit is used for transmitting the DMRS by adopting a first DMRS parameter when the initial transmission of an uplink data channel is carried out, the first DMRS parameter is selected from a pre-obtained DMRS resource pool, and the DMRS parameter comprises a DMRS port and/or a DMRS sequence.

An embodiment of the present invention further provides a base station, including: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor; it is characterized in that the preparation method is characterized in that,

the transceiver is used for receiving an uplink data channel initially transmitted by a first terminal;

the processor is used for reading the program in the memory and executing the following processes: determining DMRS parameters adopted by the first terminal in the initial transmission of an uplink data channel, wherein the adopted DMRS parameters are selected by the first terminal from a pre-obtained DMRS resource pool, and the DMRS parameters comprise DMRS ports and/or DMRS sequences; and distinguishing the uplink data channel transmitted by the first terminal according to the DMRS parameter of the DMRS sent by the first terminal, and estimating the uplink data channel of the first terminal according to the received DMRS.

The embodiment of the present invention further provides another base station, including:

a parameter determining unit, configured to receive an uplink data channel initially transmitted by a first terminal, and determine a DMRS parameter used by the first terminal when the uplink data channel is initially transmitted, where the DMRS parameter used is selected by the first terminal from a pre-obtained DMRS resource pool, and the DMRS parameter includes a DMRS port and/or a DMRS sequence;

and the channel estimation unit is used for distinguishing the uplink data channel transmitted by the first terminal according to the DMRS parameter of the DMRS sent by the first terminal and estimating the uplink data channel of the first terminal according to the received DMRS.

An embodiment of the present invention further provides a computer-readable storage medium, which includes instructions, and when the instructions are executed on a computer, the instructions cause the computer to execute the method for determining the DMRS parameter of the demodulation reference signal of the uplink data channel.

Compared with the prior art, the method and the device for determining the demodulation reference signal parameters of the uplink data channel provided by the embodiment of the invention have the advantages that the terminals independently select the DMRS parameters adopted by the terminals from the DMRS resource pool, so that the probability that different terminals adopt the same DMRS port to transmit the DMRS can be reduced, the probability of pilot frequency collision is reduced, and the reliability of data transmission is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 illustrates a block diagram of a wireless communication system in which embodiments of the present invention are applicable;

fig. 2 is a flowchart of a method for determining demodulation reference signal parameters of an uplink data channel according to an embodiment of the present invention;

fig. 3 is a flow chart of random access in the prior art;

fig. 4 is a diagram illustrating a MAC PDU structure of a RAR in the prior art;

fig. 5 is a diagram illustrating a MAC RAR structure in the prior art;

fig. 6 is another flowchart of a method for determining demodulation reference signal parameters of an uplink data channel according to an embodiment of the present invention;

fig. 7 is a flowchart of a method for determining a demodulation reference signal parameter of an uplink data channel according to an embodiment of the present invention;

fig. 8 is one of the flow diagrams of example 1 provided by the embodiments of the present invention;

fig. 9 is a second schematic flow chart of example 1 according to the embodiment of the present invention;

fig. 10 is a schematic flow chart of example 2 provided by an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a terminal according to an embodiment of the present invention.

Fig. 13 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 14 is another schematic structural diagram of a base station according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. In the description and in the claims "and/or" means at least one of the connected objects.

The techniques described herein are not limited to Long Time Evolution (LTE)/LTE Evolution (LTE-Advanced, LTE-a) and NR systems, and may also be used for various wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single carrier Frequency Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" are often used interchangeably. CDMA systems may implement Radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA), and so on. UTRA includes Wideband CDMA (Wideband code division Multiple Access, WCDMA) and other CDMA variants. TDMA systems may implement radio technologies such as Global System for Mobile communications (GSM). The OFDMA system may implement radio technologies such as Ultra Mobile Broadband (UMB), evolved-UTRA (E-UTRA), IEEE 1102.11(Wi-Fi), IEEE 1102.16(WiMAX), IEEE 1102.20, Flash-OFDM, and the like. UTRA and E-UTRA are parts of the Universal Mobile Telecommunications System (UMTS). LTE and higher LTE (e.g., LTE-A) are new UMTS releases that use E-UTRA. UTRA, E-UTRA, UMTS, LTE-A, and GSM are described in documents from an organization named "third Generation partnership Project" (3 GPP). CDMA2000 and UMB are described in documents from an organization named "third generation partnership project 2" (3GPP 2). The techniques described herein may be used for both the above-mentioned systems and radio technologies, as well as for other systems and radio technologies. However, the following description describes the NR system for purposes of example, and NR terminology is used in much of the description below, although the techniques may also be applied to applications other than NR system applications.

The following description provides examples and does not limit the scope, applicability, or configuration set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the spirit and scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

Referring to fig. 1, fig. 1 is a block diagram of a wireless communication system to which an embodiment of the present invention is applicable. The wireless communication system includes a terminal 11 and a base station 12. The terminal 11 may also be referred to as a user terminal or ue (user equipment), where the terminal 11 may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or a vehicle-mounted Device, and the specific type of the terminal 11 is not limited in the embodiment of the present invention. The base station 12 may be a 5G or later release base station (e.g., a gNB, a 5G NR NB, etc.), or a base station in other communication systems (e.g., an eNB, a WLAN access point, or other access points, etc.), wherein, a Base Station may be referred to as a node B, an evolved node B, an access point, a Base Transceiver Station (BTS), a radio Base Station, a radio Transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a node B, an evolved node B (eNB), a home node B, a home evolved node B, a WLAN access point, a WiFi node, or some other suitable terminology in the field, as long as the same technical effect is achieved, the Base Station is not limited to a specific technical vocabulary, and it should be noted that, in the embodiment of the present invention, only the base station in the NR system is taken as an example, but the specific type of the base station is not limited.

The base stations 12 may communicate with the terminals 11 under the control of a base station controller, which may be part of the core network or some of the base stations in various examples. Some base stations may communicate control information or user data with the core network through a backhaul. In some examples, some of the base stations may communicate with each other, directly or indirectly, over backhaul links, which may be wired or wireless communication links. A wireless communication system may support operation on multiple carriers (waveform signals of different frequencies). A multi-carrier transmitter can transmit modulated signals on the multiple carriers simultaneously. For example, each communication link may be a multi-carrier signal modulated according to various radio technologies. Each modulated signal may be transmitted on a different carrier and may carry control information (e.g., reference signals, control channels, etc.), overhead information, data, and so on.

Base station 12 may communicate wirelessly with terminal 11 via one or more access point antennas. Each base station may provide communication coverage for a respective coverage area. The coverage area of an access point may be divided into sectors that form only a portion of the coverage area. A wireless communication system may include different types of base stations (e.g., macro, micro, or pico base stations). The base stations may also utilize different radio technologies, such as cellular or WLAN radio access technologies. The base stations may be associated with the same or different access networks or operator deployments. The coverage areas of different base stations (including coverage areas of base stations of the same or different types, coverage areas utilizing the same or different radio technologies, or coverage areas belonging to the same or different access networks) may overlap.

The communication links in a wireless communication system may comprise an Uplink for carrying Uplink (UL) transmissions (e.g. from the terminal 11 to the base station 12) or a terminal for carrying Downlink (DL) transmissions (e.g. from the base station 12 to the user equipment 11). The UL transmission may also be referred to as reverse link transmission, while the DL transmission may also be referred to as forward link transmission. Downlink transmissions may be made using licensed frequency bands, unlicensed frequency bands, or both. Similarly, uplink transmissions may be made using licensed frequency bands, unlicensed frequency bands, or both.

An embodiment of the present invention provides a method for determining a DMRS parameter of a demodulation reference signal of an uplink data channel, as shown in fig. 2, where the method is applied to a terminal side, and the method may include:

step 201, when a terminal performs initial transmission of an uplink data channel, the terminal transmits DMRS using a first DMRS parameter, where the first DMRS parameter is selected from a pre-obtained DMRS resource pool, the DMRS resource pool includes at least one DMRS parameter, and the DMRS parameter includes a DMRS port and/or a DMRS sequence.

Here, the DMRS parameters including DMRS ports and/or DMRS sequences refer to: the DMRS parameter is a DMRS port, or the DMRS parameter is a DMRS sequence, or the DMRS parameter is a DMRS port or a DMRS sequence, or the DMRS parameter is a combination of a DMRS port and a DMRS sequence.

For example, when the DMRS parameters are DMRS ports, the DMRS resource pool may include at least 1 DMRS port, and any one DMRS port corresponds to one DMRS parameter. The terminal selects one DMRS port (such as a first DMRS port) from the DMRS resource pool, and transmits the DMRS by adopting the selected first DMRS port. Because each terminal independently selects the DMRS port adopted by the terminal, the probability of pilot collision caused by different terminals adopting the same DMRS port can be reduced.

For another example, when the DMRS parameters are DMRS sequences, the DMRS resource pool may include at least 1 DMRS sequence, and any one DMRS sequence corresponds to one DMRS parameter. And the terminal selects a DMRS sequence (such as a first DMRS sequence) from the DMRS resource pool as the DMRS to be transmitted, and then transmits the first DMRS sequence. Because each terminal independently selects the DMRS sequences transmitted by the terminal, the probability of pilot collision caused by different terminals adopting the same DMRS sequences can be reduced. It should be noted that the DMRS sequences in the DMRS resource pool may specifically be represented by using parameters for generating corresponding DMRS sequences. When a DMRS sequence is selected, a parameter corresponding to a certain DMRS sequence may be selected, and the DMRS sequence is calculated based on the parameter.

For another example, when the DMRS parameters are DMRS sequences, the DMRS resource pool may include at least 1 DMRS sequence and at least one DMRS port. Any one DMRS port or any one DMRS sequence corresponds to one DMRS parameter. The terminal selects a DMRS parameter (which can be a DMRS sequence or a DMRS port) from the DMRS resource pool, and then transmits the DMRS by adopting the DMRS parameter. Because each terminal independently selects the DMRS sequence or the DMRS port transmitted by the terminal, the probability of pilot collision caused by different terminals adopting the same DMRS port or DMRS sequence can be reduced.

For another example, when the DMRS parameters are DMRS ports and DMRS sequences, a combination of any one of the DMRS ports and the DMRS sequences corresponds to one of the DMRS parameters. Different combinations (e.g., different DMRS ports, different DMRS sequences, or both DMRS ports and DMRS sequences) are different DMRS parameters. The terminal may select one combination from the DMRS resource pool and transmit a DMRS sequence in the selected combination using a DMRS port in the selected combination. Because each terminal independently selects the DMRS port and/or the DMRS port adopted by the terminal, the probability of pilot collision of different terminals can be reduced.

Various scenarios of DMRS parameters are explained above. Hereinafter, the DMRS parameters are mainly used as DMRS ports for example.

Through the above steps, when the terminal of the embodiment of the present invention performs uplink data channel transmission, instead of using a fixed DMRS parameter (e.g., DMRS port), a DMRS parameter is selected from the DMRS resource pool, and the selected DMRS parameter (referred to as a first DMRS parameter) is used to transmit a DMRS.

For example, in the LTE or NR system in the prior art, the contention-based random access procedure generally includes 4 steps, as shown in fig. 3, which are respectively: step 301, the terminal randomly selects a preamble in a preamble resource pool to send an Msg1 (message 1); step 302, after detecting that there is a terminal sending an access preamble, the base station sends a Random Access Response (RAR) message, i.e. a message 2(MSG 2), to the terminal to inform the terminal of uplink resource information that can be used; step 303, after receiving the random access response, the terminal sends a scheduling message (first scheduled UL transmission), i.e. a message 3(MSG 3), in the uplink resource specified by the random access response message, where the message includes unique identification information of the UE; in step 304, the base station sends a collision Resolution message (collision Resolution), i.e., message 4(MSG 4), to the terminal.

Taking NR as an example, the MAC PDU structure of RAR is shown in fig. 4, where a MAC subheader (MAC subPDU 3) containing RAPID and MAC RAR is used to simultaneously allocate Msg3 initial transmission resources in response to the Msg1 message. Specifically, RAPID is a random access preamble ID, which indicates which preamble is responded to and the corresponding Msg3 resource allocation; the MAC RAR includes a Timing Advance (TA) command, an uplink grant (UL grant) including Information such as time-frequency resource allocation, Modulation and Coding Strategy (MCS), power control command, and Channel State Information (CSI), and a Temporary Cell-Radio Network Temporary Identifier (TC-RNTI), where the MAC RAR structure in the NR is shown in fig. 5.

After receiving the Msg2 message, the terminal judges whether a preamble ID (RAPID) adopted by the corresponding Msg1 is included, and if the preamble ID (RAPID) is included, the terminal sends Msg3 initial transmission according to the UL grant corresponding to the RAPID. For the initial transmission of Msg3, the terminal fixedly uses DMRS port 0 for pilot transmission. And then, the terminal monitors a downlink control channel and retransmits the Msg3 according to the control channel instruction. Wherein the control channel may indicate a DMRS port used for retransmission.

If a non-orthogonal multiple access transmission technology is introduced into the NR system, that is, signals of different terminals are multiplexed and transmitted on the same time-frequency resource, for example, the Msg3 message can also adopt the non-orthogonal multiple access technology, it is found that the existing scheme is not well supported.

For example, in the prior art, different terminals may simultaneously select the same preamble to initiate random access, and then receive the same RAR message, which includes the same UL grant. And the UE selecting the same preamble sends Msg3 initial transmission on the same time-frequency resource and uses the same DMRS port, so that pilot collision occurs. The base station cannot distinguish channels of different terminals, and further cannot distinguish Msg3 initial messages of different terminals. Although the retransmission message of the Msg3 may indicate the DMRS port used for retransmission through the control channel, since the terminals selecting the same preamble may receive the same retransmission schedule at the same time, the terminals still use the same DMRS port during retransmission, which results in a failure of Msg3 transmission and finally a failure of the random access process.

For another example, in the prior art, although the RAR message is subjected to resource allocation of Msg3 for different preambles, in theory, the base station may allocate the same Msg3 time-frequency resource for different preambles. Because the RAR cannot notify the DMRS port, if Msg3 of different terminals are initially transmitted on the same time-frequency resource, the same DMRS port is used, and pilot collision occurs. The base station cannot distinguish channels of different terminals, and further cannot distinguish Msg3 primary messages of different UEs. Although the base station can schedule the Msg3 retransmission and allocate different DMRS ports for different preambles by using different TC-RNTIs, the failure of the initial transmission message may result in the reduction of the combining performance and the increase of the access delay.

After the method of the embodiment of the present invention is adopted, when the terminal performs initial transmission of an Uplink data Channel, such as initial transmission of a Physical Uplink Shared Channel (PUSCH) of MSG3, that is, when transmitting a message 3 in a random access process, a DMRS port may be selected from a pre-obtained DMRS resource pool, and the DMRS is transmitted using the DMRS port, instead of being transmitted using a DMRS port 0 in the prior art, the base station may distinguish channels of the terminal according to different DMRS ports, identify transmission signals of different terminals, and estimate channels of different terminals respectively. Through the method, the probability that different terminals adopt the same DMRS ports to transmit the DMRS can be reduced, the probability of pilot frequency collision is reduced, the reliability of data transmission is improved, and the system performance can be improved.

After the step 201, as shown in fig. 6, the above method of the embodiment of the present invention may further include:

step 202, listening to a retransmission schedule for the uplink data channel.

Step 203, when the DMRS parameter indicated by the retransmission scheduling is the first DMRS parameter, performing retransmission of the uplink data channel according to the retransmission scheduling; and when the DMRS parameter indicated by the retransmission scheduling is not the first DMRS parameter, ignoring the retransmission scheduling.

Through the steps, the terminal which adopts the first DMRS parameter for primary transmission can be instructed to retransmit, and the terminal which does not adopt the first DMRS parameter can ignore the retransmission message, so that the problems of pilot collision and the like caused by simultaneous retransmission of a plurality of terminals can be avoided.

As an implementation manner, the DMRS resource pool in step 201 may be predefined by a relevant protocol and then configured on the terminal side, or notified by the network side, for example, notified to the terminal by the base station through a broadcast message, and received and stored locally by the terminal. In this case, the initial transmission of the uplink data channel in step 201 may be a message 3 for transmitting a random access procedure, or a PUSCH for transmitting a message other than the message 3.

As another implementation manner, the DMRS resource pool may only include 1 DMRS parameter, and at this time, the initial transmission of the uplink data channel in step 201 may be to send a message 3 of a random access procedure. Before the step 201, the terminal may also send a message 1 of the random access procedure by using the first preamble; then, the terminal receives a random access response message, acquires a DMRS resource pool corresponding to the first preamble from the random access response message, and uses the DMRS parameters in the DMRS resource pool as the first DMRS parameters, so that the terminal may acquire the DMRS resource pool and the first DMRS parameters before step 201.

As another implementation manner, the DMRS resource pool may include at least 2 DMRS parameters, and in this case, the initial transmission of the uplink data channel in step 201 may be to send a message 3 of a random access procedure. Before the step 201, the terminal may also send a message 1 of the random access procedure by using the first preamble; then, the terminal receives a random access response message, acquires a DMRS resource pool corresponding to the first preamble from the random access response message, and selects one DMRS parameter from the DMRS resource pool as the first DMRS parameter, so that the terminal may acquire the DMRS resource pool and the first DMRS parameter before step 201.

Here, when the DMRS parameters include DMRS ports, the indication of the DMRS ports may be performed in the following manner. For example, the random access response message carries:

a starting port number of the DMRS ports in the DMRS resource pool, wherein the number of the DMRS ports included in the DMRS resource pool is predefined by a protocol or is pre-configured by a network;

alternatively, the first and second electrodes may be,

the random access response message carries: the starting port number and the ending port number of the DMRS port in the DMRS resource pool;

alternatively, the first and second electrodes may be,

the random access response message carries: the starting port number of the DMRS ports in the DMRS resource pool and the number of the DMRS ports included in the DMRS resource pool.

In addition, it should be noted that, when the DMRS parameters include DMRS sequences, the DMRS resource pool may further include initialization parameters of at least one DMRS sequence, and the initialization parameters of each DMRS sequence correspond to one DMRS sequence, that is, the DMRS sequences are represented by the initialization parameters thereof. Before the DMRS is sent by using the first DMRS parameter in step 201, the terminal may calculate, according to the initialization parameter of the DMRS sequence in the first DMRS parameter, to obtain a first DMRS sequence corresponding to the first DMRS parameter, so as to obtain the DMRS to be sent.

Further, for PUSCH transmission, different data channel scrambling parameters may be used based on the selected DMRS parameters to further assist the base station in detecting different terminal signals. For example, prior to step 201, the terminal may determine a first data channel scrambling parameter corresponding to the selected first DMRS parameter; then, scrambling the DMRS transmitted by the first DMRS parameter by adopting a first data channel scrambling parameter; and then transmits the scrambled DMRS in step 201. Here, the correspondence between the DMRS parameter and the data channel scrambling parameter may be defined in advance by a protocol or notified to the terminal in advance by the network side.

In addition, in the non-orthogonal multiple access technology, in order to better distinguish signals of different terminals on the same resource, the embodiment of the invention can also use a multiple access signature (MA signature) at the transmitting end to perform processing, so as to assist the detection of the receiving end. For example, prior to step 201, the terminal may determine a first multiple access signature corresponding to the selected DMRS parameters; then, performing signature processing on the DMRS transmitted by the first DMRS parameter by adopting a first multiple access signature; further, in step 201, the DMRS after signature processing is transmitted. Here, the MA signature may specifically be a codeword, a codebook, a sequence, an interleaving pattern, a mapping pattern, and the like. For example, the MA signature may be a spreading sequence, the modulated symbol is spread by the spreading sequence at the transmitting end, and different UEs use different spreading sequences, thereby improving the detection performance of the receiving end. The correspondence between the DMRS parameters and the MA signature may be agreed in advance in a protocol or notified to the terminal in advance by the network side.

Referring to fig. 7, a method for determining a DMRS parameter of an uplink data channel according to an embodiment of the present invention is applied to a base station, where the method includes:

step 701, a base station receives an uplink data channel initially transmitted by a first terminal, and determines DMRS parameters adopted by the first terminal when the uplink data channel is initially transmitted, wherein the adopted DMRS parameters are selected by the first terminal from a pre-obtained DMRS resource pool, the DMRS resource pool includes at least one DMRS parameter, and the DMRS parameters include a DMRS port and/or a DMRS sequence.

Here, reference may be made to the above for the relevant description of the DMRS resource pool and the DMRS parameters, and details are not described here.

Step 702, the base station distinguishes the uplink data channel transmitted by the first terminal according to the DMRS parameter of the DMRS sent by the first terminal, and estimates the uplink data channel of the first terminal according to the received DMRS.

Through the steps, the base station can identify the channels of different terminals based on different DMRS parameters in the initial transmission of the uplink data channel, so as to estimate the channels of the different terminals, reduce the terminal pilot frequency collision probability to a certain extent, improve the reliability of data transmission and improve the system performance.

After the step 702, the base station may determine whether to schedule the first terminal to retransmit the uplink data channel, and the specific determination manner may refer to related implementation in the prior art, which is not described herein for brevity. When the first terminal needs to be scheduled to retransmit the uplink data channel, the base station may send a retransmission scheduling indication to the first terminal, and the retransmission scheduling indication carries the indication information of the DMRS parameter used by the first terminal. Through the DMRS parameters of the indication information, the terminal which adopts the DMRS parameters for primary transmission can be indicated for retransmission, and the terminal which does not adopt the DMRS parameters can ignore the retransmission information, so that the problems of pilot frequency collision and the like caused by simultaneous retransmission of a plurality of terminals can be avoided.

Here, the initial transmission of the uplink data channel may be to transmit message 3 of the random access procedure, or may be to transmit other messages besides message 3.

At the time of transmission of message 3:

as an implementation, the DMRS resource pool may include only 1 DMRS parameter. Before the step 701 of receiving the uplink data channel initially transmitted by the first terminal, the embodiment of the present invention may further include: a base station receives a message 1 of a random access process sent by a first terminal by adopting a first lead code; then, the base station allocates the DMRS resource pool corresponding to the first preamble, and sends a random access response message to the first terminal, where the random access response message carries indication information of the DMRS resource pool corresponding to the first preamble.

As another implementation, the DMRS resource pool may include at least 2 DMRS parameters. Before the step 701 of receiving the uplink data channel initially transmitted by the first terminal, the embodiment of the present invention may further include: a base station receives a message 1 of a random access process sent by a first terminal by adopting a first lead code; then, the base station allocates the DMRS resource pool corresponding to the first preamble, and sends a random access response message to the first terminal, where the random access response message carries indication information of the DMRS resource pool corresponding to the first preamble.

Here, when the base station receives an uplink data channel in which at least two terminals initially transmit using different preambles respectively, assuming that the at least two terminals include the first terminal, in the step of allocating DMRS resource pools corresponding to the first preamble, if time-frequency resources, which are allocated by the base station to the at least two terminals and used for transmitting a message 3 in a random access procedure, are the same, DMRS resources that do not overlap with each other are allocated to the different preambles when the DMRS resource pools corresponding to the first preamble are allocated, so that the probability that a terminal using the same time-frequency resource and generating the message 3 will collide with each other can be reduced.

In addition, similarly, when the DMRS parameters include a DMRS port, the indication information of the DMRS resource pool corresponding to the first preamble may be used to indicate:

alternatively, the first and second electrodes may be,

the starting port number and the ending port number of the DMRS port in the DMRS resource pool;

alternatively, the first and second electrodes may be,

the starting port number of the DMRS ports in the DMRS resource pool and the number of the DMRS ports included in the DMRS resource pool.

The method of the embodiments of the present invention has been described above from the terminal and base station sides, respectively. Examples are provided further below to facilitate a better understanding of the relevant aspects of embodiments of the present invention. In the following examples, DMRS parameters are used as DMRS ports, a terminal is a UE, and a base station is a gNB.

Example 1:

in this example, the UE selects one DMRS parameter in a preset DMRS resource pool for PUSCH initial transmission. And the UE judges whether the DMRS parameters of the retransmission scheduling indication are the same as the DMRS parameters selected by the UE in the initial transmission. If the data are the same, carrying out PUSCH retransmission according to retransmission scheduling; otherwise, no retransmission is performed. The DMRS resource pool is predefined in a protocol or informed by the network side. The DMRS parameters include at least a DMRS port, and may further include a DMRS sequence.

This example may also be applied to Msg3PUSCH transmissions or other PUSCH transmissions.

The following is specifically illustrated with Msg3PUSCH transmission in conjunction with fig. 11, for example: assuming that the protocol stipulates that the DMRS resource pool comprises

DMRS ports

0, 1, 2 and 3, the DMRS sequence initialization is initialized according to the cell ID, namely the DMRS sequences of the UE in the cell are the same.

In step 1101, UE1 and UE2 have simultaneously selected preamble 1 and sent Msg1 message on the same PRACH resource.

In step 1102, UE1 and UE2 receive the same RAR message, which carries RAPID1 and allocates the corresponding resource for Msg3 initial transmission.

In step 1103, the UE1 selects DMRS port 0 in the DMRS resource pool, the UE2 selects DMRS port 1 in the DMRS resource pool, and the UE1 and the UE2 simultaneously send Msg3 initial transmissions on the same time-frequency resource, and respectively use different DMRS ports.

In this way, the base station can estimate the channels of the UE1 and the UE2 through different DMRS ports, and further assist the base station in distinguishing the transmission signals of multiple UEs.

Further, referring to fig. 9, the present example may also consider the differentiation of Msg3 retransmissions. In particular, the amount of the solvent to be used,

and step 1104, the UE monitors retransmission scheduling of the Msg3 and judges whether the DMRS port indicated by the retransmission scheduling is the same as the DMRS port originally transmitted by the UE Msg 3. If the Msg3 retransmission is the same, performing Msg3 retransmission according to retransmission scheduling; otherwise, no retransmission is performed. Assuming the Msg3 retransmission schedule indicates DMRS port 1, UE2 initiates the Msg3 retransmission. The UE1 does not retransmit the Msg 3.

The following is a specific example of non-Msg 3PUSCH transmission, such as: the DMRS resource pool assumption is the same as above.

Firstly, the UE1 selects DMRS port 0 in the DMRS resource pool, the UE2 selects DMRS port 1 in the DMRS resource pool, and the UE1 and the UE2 simultaneously transmit PUSCH initial transmissions on the same time-frequency resource and respectively use different DMRS ports.

Then, the UE monitors the retransmission scheduling of the PUSCH and judges whether the DMRS port indicated by the retransmission scheduling is the same as the DMRS port originally transmitted by the UE. If the data are the same, carrying out PUSCH retransmission according to retransmission scheduling; otherwise, no retransmission is performed.

For the above example, the DMRS resource pool may further include DMRS ports and DMRS sequences, specifically, for example, the DMRS ports include DMRS ports 0 to 7, the DMRS sequence initialization parameter is a set, and different DMRS sequences are obtained through calculation based on different values in the set.

In addition, preferably, for PUSCH transmission, different data channel scrambling parameters may also be employed based on the selected DMRS resources to further assist in detection of different UE signals.

In addition, in the non-orthogonal multiple access technology, in order to better distinguish signals of different UEs on the same resource, a multiple access signature (MA signature) may be used at the transmitting end to perform processing, so as to assist the detection of the receiving end. The MA signature may be a codeword, codebook, sequence, interleaving pattern, mapping pattern, etc. For example, the MA signature may be a spreading sequence, the modulated symbol is spread by the spreading sequence at the transmitting end, and different UEs use different spreading sequences, thereby improving the detection performance of the receiving end.

In this example, the UE may further select a corresponding MA signature according to the DMRS port of the PUSCH. The correspondence between the DMRS port and the MA signature may be agreed in advance in a protocol or notified by the network side.

Example 2:

in this example 2, the RAR message notifies one DMRS resource for each preamble. Preferably, the base station notifies the DMRS resource of the Msg3 message in the UL grant of the MACRAR. Specifically, the protocol stipulates the number of bits N used for notifying DMRS resources in the UL grant.

For example, suppose that the UL grant in the protocol-agreed MAC RAR includes 2 bits for notifying the DMRS port, and an example of the corresponding relationship between the 2 bits and the DMRS port is shown in table 1:

Value	DMRS port(s)
		0	0
1	1
		2	2
3	3

TABLE 1

The base station instructs the UE to use

DMRS ports

0, 1, 2, 3 for Msg3PUSCH transmission by setting the 2-bit information field to '00', '01', '10', '11', respectively.

The following is illustrated in connection with fig. 10, for example:

step 1001, on the same PRACH resource, UE1 selects preamble 1 to send Msg1 message, and UE2 selects preamble 5 to send Msg1 message.

In step 1002, the UE1 and the UE2 receive the same RAR message, where RAPID1 and RAPID 5 are carried, and corresponding resources for Msg3 initial transmission are respectively allocated, and Msg3 initial transmission resources of the two are the same. The RAR indicates that the Msg3 initial transmission DMRS port corresponding to RAPID1 is 0, and the Msg3 initial transmission DMRS port corresponding to RAPID 5 is 1.

In step 1003, UE1 uses DMRS port 0 and UE2 uses DMRS port 1 to simultaneously send Msg3 initial transmission on the same time-frequency resource.

The base station can estimate the channels of the UE1 and the UE2 through different DMRS ports, thereby assisting the base station in distinguishing the transmission signals of multiple UEs.

As the RAR message respectively allocates temporary C-RNTIs (TC-RNTIs) for different preambles, and the control channel carrying the retransmission scheduling of the Msg3 is scrambled by using the TC-RNTIs, the base station determines which UE needs to carry out the Msg3 retransmission based on the detection of the initial transmission of the Msg3, and scrambles the control channel carrying the retransmission scheduling of the Msg3 by using the TC-RNTIs of the UE.

As in example 1, in this example 2, the DMRS resources may further include DMRS sequences. In addition, the UE may further select a corresponding data channel scrambling sequence and/or MA signature according to the DMRS of Msg 3. The correspondence between the data channel scrambling sequence and/or DMRS port and the MA signature may be agreed in advance in the protocol or notified by the network side. Alternatively, the indication is made in a RAR message or Msg3 retransmission schedule. Specifically, the indication manner in the RAR message may be the same as the method for indicating the DMRS port, that is, for different RAPID, the data channel scrambling sequence and/or the MA signature are respectively indicated. For the Msg3 retransmission schedule, a data channel scrambling sequence and/or MA signature is indicated in the scheduling information.

Example 3:

in this example 3, the RAR message notifies one DMRS resource pool for each preamble. Preferably, the base station notifies the DMRS resource pool of the Msg3 message in the UL grant of the MAC RAR. Specifically, the protocol stipulates the number of bits M in the UL grant for informing the DMRS resource pool. And the UE selects one DMRS from the notified DMRS resource pool for Msg3PUSCH transmission.

Specifically, assuming that the DMRS resource is a DMRS port, a manner of notifying a DMRS port resource pool in the MAC RAR includes:

1) informing start DMRS port numbers

For example, the MAC RAR uses 3 bits to indicate a starting DMRS port number, and the number of DMRS ports is pre-agreed by a protocol or pre-configured by a network side. An example of the 3-bit corresponding relationship with the DMRS port is shown in table 2:

Value	DMRS port(s)
		0	0
1	1
		2	2
3	3
		4	4
5	5
		6	6
7	7

TABLE 2

Assuming that the number of DMRS ports is 2, which is agreed in advance by a protocol or pre-configured by a network side, if the MAC RAR informs that the starting DMRS port number is 4, the DMRS port resource pool comprises a DMRS port 4 and a DMRS port 5.

2) Informing starting and terminating DMRS port numbers

For example, 3 bits are used in the MAC RAR to indicate the starting DMRS port number and 3 bits are used to indicate the terminating DMRS port number. Still adopting the assumption in table 2, if the MAC RAR notifies that the starting DMRS port number is 1 and the terminating DMRS port number is 4, the DMRS port resource pool includes DMRS port 1, DMRS port 2, DMRS port 3, and DMRS port 4.

3) Informing starting DMRS port number and DMRS port number

For example, the MAC RAR uses 3 bits for indicating the starting DMRS port number and 3 bits for indicating the number of DMRS ports.

TABLE 3

The starting DMRS port number uses the assumption in table 2, and the DMRS port number uses the assumption in table 3. And if the MAC RAR informs that the number of the initial DMRS port is 1 and the number of the DMRS ports is 4, the DMRS port resource pool comprises a DMRS port 1, a DMRS port 2, a DMRS port 3 and a DMRS port 4.

And for the retransmission of the Msg3, the UE monitors the TC-RNTI allocated to the preamble in the RAR and simultaneously judges whether the DMRS port indicated in the retransmission scheduling is the same as the DMRS port initially transmitted by the Msg 3. If the ports are the same, carrying out Msg3 retransmission; otherwise, no retransmission is performed.

In this example, the correspondence between the DMRS port and the data channel scrambling code and/or the MA signature may be agreed in advance or notified by the network side. Preferably, each DMRS port corresponds to one data channel scrambling code and/or MA signature, and different DMRS ports may correspond to the same data channel scrambling code and/or MA signature or different data channel scrambling codes and/or MA signatures. The UE determines a corresponding data channel scrambling code and/or MA signature based on the determined DMRS port.

Through the above embodiments and the description of the examples, it can be seen that the embodiments of the present invention may support Msg3 initial transmission non-orthogonal multiple access transmission, including non-orthogonal multiple access transmission of different UEs that select the same preamble and non-orthogonal multiple access transmission of UEs that select different preambles. Due to the fact that the UE adopts different DMRS parameters, the base station can distinguish channel estimation of a plurality of UEs, signals of the plurality of UEs are further distinguished, and detection performance and resource utilization efficiency of the Msg3 are improved. In addition, different MA signatures may be used to further improve performance.

Based on the method, the embodiment of the invention also provides equipment for implementing the method.

Referring to fig. 11, a schematic structural diagram of a terminal according to an embodiment of the present invention is shown, where the terminal 110 includes: a processor 1101, a transceiver 1102, a memory 1103, a user interface 1104, and a bus interface, wherein:

in this embodiment of the present invention, the terminal 1100 further includes: a computer program stored on the memory 1103 and executable on the processor 1101.

In fig. 11, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 1101, and various circuits, represented by memory 1103, linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1102 may be a plurality of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. For different user devices, the user interface 1104 may also be an interface capable of interfacing with a desired device externally, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 1101 is responsible for managing the bus architecture and general processing, and the memory 1103 may store data used by the processor 1101 in performing operations.

Here, the processor 1101 is configured to read a program in the memory, and execute the following processes: monitoring retransmission scheduling aiming at the uplink data channel; when the DMRS parameter indicated by the retransmission scheduling is the first DMRS parameter, retransmitting an uplink data channel according to the retransmission scheduling; and when the DMRS parameter indicated by the retransmission scheduling is not the first DMRS parameter, ignoring the retransmission scheduling.

Optionally, the DMRS resource pool is predefined by a protocol or notified by a network side.

Optionally, the initial transmission of the uplink data channel is: message 3 of the random access procedure is transmitted.

Optionally, the DMRS resource pool only includes 1 DMRS parameter;

the transceiver 1102 is further configured to send a message 1 of a random access procedure by using a first preamble before performing initial transmission of an uplink data channel; receiving a random access response message;

the processor 1101 is further configured to acquire the DMRS resource pool corresponding to the first preamble from the random access response message, and use the DMRS parameters in the DMRS resource pool as the first DMRS parameters.

Optionally, the DMRS resource pool comprises at least 2 DMRS parameters; the transceiver 1102 is further configured to send a message 1 of a random access procedure by using a first preamble before performing initial transmission of an uplink data channel; receiving a random access response message;

the processor 1101 is further configured to acquire a DMRS resource pool corresponding to the first preamble from the random access response message, and select one DMRS parameter from the DMRS resource pool as the first DMRS parameter.

Optionally, when the DMRS parameter includes a DMRS port, the random access response message carries:

alternatively, the first and second electrodes may be,

Optionally, when the DMRS parameters include DMRS sequences, the DMRS resource pool further includes initialization parameters of at least one DMRS sequence, where the initialization parameters of each DMRS sequence correspond to one DMRS sequence; the processor 1101 is further configured to, before the transceiver 1102 transmits the DMRS using the first DMRS parameter, calculate a first DMRS sequence corresponding to the first DMRS parameter according to the initialization parameter of the DMRS sequence in the first DMRS parameter, and obtain the DMRS to be transmitted.

Optionally, the processor 1101 is further configured to determine a first data channel scrambling code parameter corresponding to the selected first DMRS parameter before the transceiver 1102 transmits the DMRS using the first DMRS parameter; and scrambling the DMRS transmitted by adopting the first DMRS parameter by adopting the first data channel scrambling parameter.

Optionally, the processor 1101 is further configured to determine a first multiple access signature corresponding to the selected DMRS parameter before the transceiver 1102 transmits the DMRS using the first DMRS parameter; and performing signature processing on the DMRS transmitted by adopting the first DMRS parameter by adopting the first multiple access signature.

Referring to fig. 12, an embodiment of the present invention provides another terminal 120, including:

a transmitting unit 121, configured to transmit the DMRS using a first DMRS parameter when performing initial transmission of an uplink data channel, where the first DMRS parameter is selected from a pre-obtained DMRS resource pool, and the DMRS parameter includes a DMRS port and/or a DMRS sequence.

Preferably, the terminal may further include:

a monitoring unit, configured to monitor retransmission scheduling for the uplink data channel after the transmitting unit transmits the DMRS;

a retransmission unit, configured to perform retransmission of an uplink data channel according to the retransmission scheduling when the DMRS parameter indicated by the retransmission scheduling is the first DMRS parameter; and when the DMRS parameter indicated by the retransmission scheduling is not the first DMRS parameter, ignoring the retransmission scheduling.

Preferably, the DMRS resource pool is predefined by a protocol or notified by a network side.

Preferably, the initial transmission of the uplink data channel is: message 3 of the random access procedure is transmitted.

Preferably, the DMRS resource pool only includes 1 DMRS parameter; the terminal further comprises:

a first access unit, configured to send a message 1 of a random access procedure by using a first preamble before performing initial transmission of an uplink data channel; and receiving a random access response message, acquiring a DMRS resource pool corresponding to the first lead code from the random access response message, and taking the DMRS parameters in the DMRS resource pool as the first DMRS parameters.

Preferably, the DMRS resource pool comprises at least 2 DMRS parameters; the terminal further comprises: the terminal sends a message 1 of a random access process by adopting a first lead code;

and the second access unit is used for receiving a random access response message, acquiring the DMRS resource pool corresponding to the first lead code from the random access response message, and selecting one DMRS parameter from the DMRS resource pool as the first DMRS parameter.

Preferably, when the DMRS parameters include DMRS ports,

the random access response message carries: a starting port number of the DMRS ports in the DMRS resource pool, wherein the number of the DMRS ports included in the DMRS resource pool is predefined by a protocol or is pre-configured by a network;

alternatively, the first and second electrodes may be,

Preferably, when the DMRS parameters include DMRS sequences, the DMRS resource pool further includes initialization parameters of at least one DMRS sequence, the initialization parameters of each DMRS sequence corresponding to one DMRS sequence; the terminal further comprises:

and the sequence calculation unit is used for calculating to obtain a first DMRS sequence corresponding to the first DMRS parameter according to the initialization parameter of the DMRS sequence in the first DMRS parameter before the first DMRS parameter is adopted to transmit the DMRS, so as to obtain the DMRS to be transmitted.

Preferably, the terminal further includes:

a scrambling unit, configured to determine a first data channel scrambling parameter corresponding to the selected first DMRS parameter before transmitting the DMRS using the first DMRS parameter; and scrambling the DMRS transmitted by adopting the first DMRS parameter by adopting the first data channel scrambling parameter.

Preferably, the terminal further includes:

a signature unit configured to determine a first multiple access signature corresponding to the selected DMRS parameter before transmitting the DMRS using the first DMRS parameter; and performing signature processing on the DMRS transmitted by adopting the first DMRS parameter by adopting the first multiple access signature.

Referring to fig. 13, an embodiment of the present invention provides a structural diagram of a base station 1300, including: a processor 1301, a transceiver 1302, a memory 1303 and a bus interface, wherein:

in this embodiment of the present invention, the base station 1300 further includes: a computer program stored on the memory 1303 and executable on the processor 1301.

The transceiver 1302 is configured to receive an uplink data channel initially transmitted by a first terminal;

the processor 1301 is configured to read a program in the memory, and execute the following processes: determining DMRS parameters adopted by the first terminal in the initial transmission of an uplink data channel, wherein the adopted DMRS parameters are selected by the first terminal from a pre-obtained DMRS resource pool, and the DMRS parameters comprise DMRS ports and/or DMRS sequences; and distinguishing the uplink data channel transmitted by the first terminal according to the DMRS parameter of the DMRS sent by the first terminal, and estimating the uplink data channel of the first terminal according to the received DMRS.

In fig. 13, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 1301 and various circuits of memory represented by memory 1303 linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1302 may be a plurality of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 1301 is responsible for managing a bus architecture and general processing, and the memory 1303 may store data used by the processor 1301 in performing operations.

Preferably, the transceiver 1302 is further configured to send a retransmission scheduling indication to the first terminal when the first terminal needs to be scheduled to retransmit the uplink data channel, and carry, in the retransmission scheduling indication, the indication information of the DMRS parameter used by the first terminal.

Preferably, the DMRS resource pool is predefined by a protocol or is informed by a base station.

Preferably, the DMRS resource pool only includes 1 DMRS parameter; the transceiver 1302 is further configured to receive, before receiving an uplink data channel initially transmitted by the first terminal, a message 1 that the first terminal sends a random access procedure by using the first preamble; the processor 1301 is further configured to allocate the DMRS resource pool corresponding to the first preamble, and send a random access response message to the first terminal through the transceiver 1302, where the random access response message carries indication information of the DMRS resource pool corresponding to the first preamble.

Preferably, the DMRS resource pool comprises at least 2 DMRS parameters; the transceiver 1302 is further configured to receive, before receiving an uplink data channel initially transmitted by the first terminal, a message 1 that the first terminal sends a random access procedure by using the first preamble; the processor 1301 is further configured to allocate the DMRS resource pool corresponding to the first preamble, and send a random access response message to the first terminal through the transceiver 1302, where the random access response message carries indication information of the DMRS resource pool corresponding to the first preamble.

Preferably, when the DMRS parameters include a DMRS port, the indication information of the DMRS resource pool corresponding to the first preamble is used to indicate:

alternatively, the first and second electrodes may be,

Preferably, when receiving uplink data channels that are initially transmitted by at least two terminals using different preambles, where the at least two terminals include the first terminal, the processor 1301 is further configured to: and if the time-frequency resources, which are allocated to the at least two terminals and used for transmitting the message 3 in the random access process, are the same, allocating non-overlapping DMRS resources for different lead codes when allocating the DMRS resource pools corresponding to the first lead code.

Referring to fig. 14, an embodiment of the present invention provides another structure of a base station 140, as shown in fig. 14, the base station 140 includes:

a parameter determining unit 141, configured to receive an uplink data channel initially transmitted by a first terminal, and determine a DMRS parameter used by the first terminal when the uplink data channel is initially transmitted, where the DMRS parameter used is selected by the first terminal from a pre-obtained DMRS resource pool, and the DMRS parameter includes a DMRS port and/or a DMRS sequence;

a channel estimation unit 142, configured to distinguish an uplink data channel transmitted by the first terminal according to the DMRS parameter sent by the first terminal, and estimate the uplink data channel of the first terminal according to the received DMRS.

Preferably, the base station further includes:

and the retransmission scheduling unit is used for sending a retransmission scheduling instruction to the first terminal when the first terminal needs to be scheduled to retransmit the uplink data channel, and the retransmission scheduling instruction carries the indication information of the DMRS parameter adopted by the first terminal.

Preferably, the DMRS resource pool only includes 1 DMRS parameter; the base station further includes:

the first allocation unit is used for receiving a message 1 of a random access process sent by a first terminal by adopting a first lead code before receiving an uplink data channel initially transmitted by the first terminal; and allocating the DMRS resource pool corresponding to the first lead code, and sending a random access response message to the first terminal, wherein the random access response message carries indication information of the DMRS resource pool corresponding to the first lead code.

Preferably, the DMRS resource pool comprises at least 2 DMRS parameters; the base station further includes:

the second allocating unit is used for receiving a message 1 of a random access process sent by the first terminal by adopting the first lead code before receiving the uplink data channel initially transmitted by the first terminal; and allocating the DMRS resource pool corresponding to the first lead code, and sending a random access response message to the first terminal, wherein the random access response message carries indication information of the DMRS resource pool corresponding to the first lead code.

alternatively, the first and second electrodes may be,

Preferably, the allocating unit is further configured to, when receiving uplink data channels that are initially transmitted by at least two terminals respectively using different preambles, where the at least two terminals include the first terminal, and if the time-frequency resources allocated to the at least two terminals and used for transmitting the message 3 in the random access procedure are the same, allocate DMRS resources that do not overlap with each other to the different preambles when allocating DMRS resource pools corresponding to the first preambles.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention or a part of the technical solution that contributes to the prior art in essence may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method for determining the DMRS parameter of the demodulation reference signal for the uplink data channel according to various embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for determining a demodulation reference signal (DMRS) parameter of an uplink data channel is characterized by comprising the following steps:

2. The determination method of claim 1, further comprising: after transmitting the DMRS, the determining method further includes:

monitoring retransmission scheduling aiming at the uplink data channel;

when the DMRS parameter indicated by the retransmission scheduling is the first DMRS parameter, retransmitting an uplink data channel according to the retransmission scheduling;

and when the DMRS parameter indicated by the retransmission scheduling is not the first DMRS parameter, ignoring the retransmission scheduling.

3. The determination method of claim 1, in which the DMRS resource pool is protocol predefined or signaled by a network side.

4. The determination method of claim 1,

the initial transmission of the uplink data channel is as follows: message 3 of the random access procedure is transmitted.

5. The determination method of claim 4, in which the DMRS resource pool comprises only 1 DMRS parameter; before performing the initial transmission of the uplink data channel, the determining method further includes:

the terminal sends a message 1 of a random access process by adopting a first lead code;

and the terminal receives a random access response message, acquires the DMRS resource pool corresponding to the first lead code from the random access response message, and takes the DMRS parameters in the DMRS resource pool as the first DMRS parameters.

6. The determination method of claim 4, wherein the DMRS resource pool comprises at least 2 DMRS parameters; before performing the initial transmission of the uplink data channel, the determining method further includes:

and the terminal receives a random access response message, acquires the DMRS resource pool corresponding to the first lead code from the random access response message, and selects a DMRS parameter from the DMRS resource pool as the first DMRS parameter.

7. The determination method of claim 6,

when the DMRS parameters include a DMRS port,

alternatively, the first and second electrodes may be,

8. The determination method of claim 1,

when the DMRS parameters comprise DMRS sequences, the DMRS resource pool further comprises initialization parameters of at least one DMRS sequence, and the initialization parameters of each DMRS sequence correspond to one DMRS sequence;

before the step of transmitting the DMRS using the first DMRS parameter, the method further includes:

and calculating to obtain a first DMRS sequence corresponding to the first DMRS parameter according to the initialization parameter of the DMRS sequence in the first DMRS parameter, so as to obtain the DMRS to be sent.

9. The determination method of claim 8,

determining a first data channel scrambling code parameter corresponding to the selected first DMRS parameter;

and scrambling the DMRS transmitted by adopting the first DMRS parameter by adopting the first data channel scrambling parameter.

10. The determination method of claim 8,

determining a first multiple access signature corresponding to the selected DMRS parameter;

and performing signature processing on the DMRS transmitted by adopting the first DMRS parameter by adopting the first multiple access signature.

11. A method for determining a demodulation reference signal (DMRS) parameter of an uplink data channel is characterized by comprising the following steps:

12. The determination method of claim 11, further comprising:

and when the first terminal needs to be scheduled to retransmit the uplink data channel, sending a retransmission scheduling indication to the first terminal, wherein the retransmission scheduling indication carries the indication information of the DMRS parameter adopted by the first terminal.

13. The determination method of claim 11, wherein the DMRS resource pool is protocol predefined or signaled by a base station.

14. The determination method of claim 11,

15. The determination method of claim 14, wherein the DMRS resource pool comprises only 1 DMRS parameter; before receiving the uplink data channel initially transmitted by the first terminal, the determining method further includes:

receiving a message 1 of a random access process sent by a first terminal by adopting a first lead code;

and allocating the DMRS resource pool corresponding to the first lead code, and sending a random access response message to the first terminal, wherein the random access response message carries indication information of the DMRS resource pool corresponding to the first lead code.

16. The determination method of claim 14, wherein the DMRS resource pool comprises at least 2 DMRS parameters; before receiving the uplink data channel initially transmitted by the first terminal, the determining method further includes:

17. The determination method of claim 16,

when the DMRS parameters comprise DMRS ports, the indication information of the DMRS resource pool corresponding to the first preamble is used for indicating that:

alternatively, the first and second electrodes may be,

18. The determination method according to claim 15 or 16,

when receiving an uplink data channel in which at least two terminals respectively adopt different preambles for initial transmission, where the at least two terminals include the first terminal, the step of allocating the DMRS resource pool corresponding to the first preamble includes:

and if the time-frequency resources, which are allocated to the at least two terminals and used for transmitting the message 3 in the random access process, are the same, allocating non-overlapping DMRS resources for different lead codes when allocating the DMRS resource pools corresponding to the first lead code.

19. A terminal, comprising: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor; it is characterized in that the preparation method is characterized in that,

20. The terminal of claim 19,

the processor is used for reading the program in the memory and executing the following processes: monitoring retransmission scheduling aiming at the uplink data channel; when the DMRS parameter indicated by the retransmission scheduling is the first DMRS parameter, retransmitting an uplink data channel according to the retransmission scheduling; and when the DMRS parameter indicated by the retransmission scheduling is not the first DMRS parameter, ignoring the retransmission scheduling.

21. The terminal of claim 19, in which the DMRS resource pool is protocol predefined or signaled by a network side.

22. The terminal of claim 19,

23. The terminal of claim 22,

the DMRS resource pool only includes 1 DMRS parameter;

the transceiver is further configured to send a message 1 of a random access procedure by using a first preamble before performing initial transmission of an uplink data channel; receiving a random access response message;

the processor is further configured to acquire a DMRS resource pool corresponding to the first preamble from the random access response message, and use the DMRS parameters in the DMRS resource pool as the first DMRS parameters.

24. The terminal of claim 22,

the DMRS resource pool comprises at least 2 DMRS parameters;

the processor is further configured to acquire a DMRS resource pool corresponding to the first preamble from the random access response message, and select a DMRS parameter from the DMRS resource pool as the first DMRS parameter.

25. The terminal of claim 24,

when the DMRS parameters include a DMRS port,

alternatively, the first and second electrodes may be,

26. The terminal of claim 19,

the processor is further configured to, before the transceiver transmits the DMRS using the first DMRS parameter, calculate a first DMRS sequence corresponding to the first DMRS parameter according to the initialization parameter of the DMRS sequence in the first DMRS parameter, and obtain the DMRS to be transmitted.

27. The terminal of claim 26,

the processor is further configured to determine a first data channel scrambling parameter corresponding to the selected first DMRS parameter before the transceiver transmits DMRS using the first DMRS parameter; and scrambling the DMRS transmitted by adopting the first DMRS parameter by adopting the first data channel scrambling parameter.

28. The terminal of claim 26,

the processor is further configured to determine a first multiple access signature corresponding to the selected DMRS parameter before the transceiver transmits the DMRS using the first DMRS parameter; and performing signature processing on the DMRS transmitted by adopting the first DMRS parameter by adopting the first multiple access signature.

29. A terminal, comprising:

30. A base station, comprising: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor; it is characterized in that the preparation method is characterized in that,

31. The base station of claim 30,

the transceiver is further configured to send a retransmission scheduling indication to the first terminal when the first terminal needs to be scheduled to retransmit the uplink data channel, and the retransmission scheduling indication carries indication information of a DMRS parameter used by the first terminal.

32. The base station of claim 30, wherein the DMRS resource pool is protocol predefined or signaled by a base station.

33. The base station of claim 30,

34. The base station of claim 33, wherein the DMRS resource pool comprises only 1 DMRS parameter;

the transceiver is further configured to receive a message 1 of a random access process sent by the first terminal by using the first preamble before receiving an uplink data channel initially transmitted by the first terminal;

the processor is further configured to allocate the DMRS resource pool corresponding to the first preamble, and send a random access response message to the first terminal through the transceiver, where the random access response message carries indication information of the DMRS resource pool corresponding to the first preamble.

35. The base station of claim 33, wherein the pool of DMRS resources comprises at least 2 DMRS parameters;

36. The base station of claim 35,

alternatively, the first and second electrodes may be,

37. The base station of claim 34 or 35,

when receiving uplink data channels in which at least two terminals respectively adopt different preamble initial transmissions, the at least two terminals including the first terminal, the processor is further configured to: and if the time-frequency resources, which are allocated to the at least two terminals and used for transmitting the message 3 in the random access process, are the same, allocating non-overlapping DMRS resources for different lead codes when allocating the DMRS resource pools corresponding to the first lead code.

38. A base station, comprising:

39. A computer-readable storage medium, characterized by comprising instructions which, when executed on a computer, cause the computer to perform the method for determining a demodulation reference signal, DMRS, parameter for an uplink data channel as claimed in any one of claims 1 to 18.