WO2018082244A1

WO2018082244A1 - Method and device for configuring demodulation reference signal, computer storage medium

Info

Publication number: WO2018082244A1
Application number: PCT/CN2017/078110
Authority: WO
Inventors: 蒋创新; 弓宇宏; 梅猛; 陈艺戬; 张楠; 李儒岳; 鲁照华
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-11-04
Filing date: 2017-03-24
Publication date: 2018-05-11
Also published as: CN108024342B; CN108024342A

Abstract

Disclosed in the present disclosure are a method and a device for configuring a demodulation reference signal, and a computer storage medium. The method comprises: a first communication node instructs a second communication node a parameter for a demodulation reference signal through a preset signaling, wherein the parameter for the demodulation reference signal comprises at least one of the following: the type of the sequence of the demodulation reference signal, a time domain position, a pattern, a density, the length of an orthogonal code, a root sequence, a cyclic shift sequence, and the number of ports.

Description

Method and device for configuring demodulation reference signal, computer storage medium

Technical field

The present disclosure relates to the field of wireless communications, and more particularly to a method and apparatus for configuring a demodulation reference signal, and a computer storage medium, relating to the research direction of 5G communication.

Background technique

At present, the physical layer technology of NR (New Radio) is under discussion in the RAN1 of the 3rd Generation Partnership Project (3GPP). Flexibility and efficiency have always been the goal pursued by the NR physical layer design. The pursuit of maximum flexibility in the physical layer demodulation reference signal also seems to be a trend. This is because the requirements for demodulating reference signals may be different for different application scenarios.

For example, for a high-speed mobile user, in a time domain transmitting unit, the density of the demodulation reference signal in the time domain should be high to meet the characteristics of fast change in the channel time domain caused by high Doppler shift, and For low-speed users, the demodulation reference signal in the time domain can be loose due to the slower change of the channel in the time domain. As shown in FIG. 1, in one time domain unit, the base station can be configured to provide high speed user 2 column reference signals, and configured to low speed user 1 column demodulation reference signals.

For another example, for a user with a large angle expansion, since the channel is not flat in the frequency domain, the base station is required to configure the user to configure a high-density demodulation reference signal in the frequency domain, and if the user's channel is relatively flat in the frequency domain. Then, the base station can configure the user to configure a low-density demodulation reference signal in the frequency domain. As shown in Figure 2, the left picture shows the high-density demodulation reference signal in the frequency domain, and the right picture shows the low-density demodulation reference signal in the frequency domain.

For another example, if the demodulation reference signal is placed at the front end of a time domain unit, the demodulation device can quickly demodulate the demodulation reference signal to demodulate the data, that is, speed up data demodulation. However, there may be an impact on channel estimation. And if the demodulation reference signal is placed in a time domain In the middle of the element, the performance of the channel estimation will be better, but it is not conducive to fast data demodulation. As shown in FIG. 3, the left picture shows the demodulation reference signal placed at the front end of the transmitting unit, and the right picture is placed in the middle of the transmitting unit.

In addition, in order to support scheduling flexibility, a scheduling manner in which multiple minimum scheduling units are aggregated can reduce scheduling overhead. If a minimum scheduling unit is a time slot, in order to reduce signaling overhead and pursue flexibility, in one scheduling, the base station may allocate a resource of one time slot or a resource of multiple time slots to the user. As shown in FIG. 4, the base station allocates one slot to the user 1 in one scheduling, and allocates resources to the two slots of the user 2.

In addition, if the base station allocates a time slot to the user and only one demodulation reference signal of the time domain symbol is configured in one time slot, then the orthogonal mask (OCC) cannot be used to distinguish multiple times in the time domain. user. If the base station allocates two demodulation reference signals of the time domain symbols to the user in one time slot, the length 2 OCC sequence can be applied to the symbols of the two demodulation reference signals, which is similar to long term evolution. (LTE, Long Term Evolution) R10 uplink demodulation reference signal. Since the number of time slots allocated in the time domain may dynamically change in one scheduling, and the number of time domain symbols of the demodulation reference signal of each time slot may also change, the length of the OCC in the time domain cannot be determined.

In order to pursue maximum flexibility, if the time-frequency domain position, density, length of the time domain scheduling unit, etc. of the demodulation reference signal are all configured in the physical layer control signaling, the overhead of the control signaling will become enormous.

In addition, a multi-segment cascade approach is suggested if the NR employs a ZC sequence. As shown in FIG. 5, the bandwidth used to demodulate the reference signal is divided into a plurality of sub-bands, each of which is used to transmit a complete ZC sequence, that is, the length of the ZC sequence is equal to the length of the sub-band. The advantage of this scheme is that the sequence of demodulation reference signals can be derived from the allocated resource locations and does not vary according to the allocated resource length. However, the details have yet to be further designed to achieve maximum interference randomization and minimal signaling overhead. Root or root of the ZC sequence as described in LTE 36.211 The sequence refers to the u value or v value of the uplink reference signal in LTE.

Summary of the invention

To solve the above technical problem, an embodiment of the present disclosure provides a method and apparatus for configuring a demodulation reference signal, and a computer storage medium.

A method for configuring a demodulation reference signal provided by an embodiment of the present disclosure includes:

The first communication node indicates to the second communication node, by using preset signaling, a parameter used for demodulating the reference signal; wherein the parameter used for demodulating the reference signal includes at least one of: a type of sequence of the demodulation reference signal, Time domain location, pattern, density, orthogonal code length, root sequence, cyclic shift sequence, number of ports, number of time domain symbols, indication information whether or not to transmit simultaneously with data.

The second communication node determines a parameter used for demodulating the reference signal by receiving preset signaling sent by the first communication node; wherein the parameter used for demodulating the reference signal includes at least one of: demodulating the reference signal The type of the sequence, the time domain position, the pattern, the density, the orthogonal code length, the root sequence, the cyclic shift sequence, the number of ports, the number of time domain symbols, and whether or not the information is transmitted simultaneously with the data.

An apparatus for configuring a demodulation reference signal provided by an embodiment of the present disclosure is applied to a first communication node, where the apparatus includes:

The indicating unit is configured to indicate, by using preset signaling, the second communication node, the parameter used for demodulating the reference signal; wherein the parameter used for demodulating the reference signal comprises at least one of: a type of sequence of the demodulated reference signal Time domain location, pattern, density, orthogonal code length, root sequence, cyclic shift sequence, number of ports, number of time domain symbols, and indication information whether or not to transmit simultaneously with data.

An apparatus for configuring a demodulation reference signal provided by an embodiment of the present disclosure is applied to a second communication node, where the apparatus includes:

a determining unit, configured to determine a parameter used for demodulating the reference signal by receiving preset signaling sent by the first communications node; wherein the parameter used for demodulating the reference signal comprises at least one of: demodulating a reference signal The type of the sequence, the time domain position, the pattern, the density, the orthogonal code length, the root sequence, the cyclic shift sequence, the number of ports, the number of time domain symbols, and whether or not the information is transmitted simultaneously with the data.

A computer storage medium provided by an embodiment of the present disclosure stores a computer program configured to perform the above-described method of configuring a demodulation reference signal.

In the technical solution of the embodiment of the present disclosure, the first communication node indicates, by using preset signaling, the second communication node, the parameter used for demodulating the reference signal; wherein the parameter used for demodulating the reference signal includes at least one of the following: The type of the demodulation reference signal, the time domain position, the pattern, the density, the orthogonal code length, the root sequence, the cyclic shift sequence, the number of ports, the number of time domain symbols, and whether or not the information is transmitted simultaneously with the data. . With the technical solution of the embodiment of the present disclosure, the configuration parameter indicating the demodulation reference signal implied by other signaling is implemented, which saves signaling overhead. In addition, for the multi-segment cascading method, the root sequence on different sub-bands, the loop thinks that the pattern change can bring interference randomization.

DRAWINGS

1 is a schematic diagram 1 of a data structure according to an embodiment of the present disclosure;

2 is a second schematic diagram of a data structure according to an embodiment of the present disclosure;

3 is a schematic diagram 3 of a data structure according to an embodiment of the present disclosure;

4 is a schematic diagram 4 of a data structure according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram 5 of a data structure according to an embodiment of the present disclosure;

6 is a schematic diagram 6 of a data structure according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a data structure according to an embodiment of the present disclosure.

FIG. 8 is a schematic diagram of a data structure of an embodiment of the present disclosure.

9a is a schematic diagram IX of a data structure according to an embodiment of the present disclosure;

9b is a schematic diagram of a data structure of an embodiment of the present disclosure;

Figure 10a is a schematic diagram 11 of the data structure of the embodiment of the present disclosure;

FIG. 10b is a schematic diagram of a data structure of an embodiment of the present disclosure;

FIG. 10c is a schematic diagram of a data structure of an embodiment of the present disclosure;

Figure 10d is a schematic diagram showing the data structure of the embodiment of the present disclosure;

11 is a schematic diagram of a data structure of an embodiment of the present disclosure.

12 is a schematic diagram of a data structure of an embodiment of the present disclosure;

FIG. 13 is a schematic diagram of a data structure of an embodiment of the present disclosure;

FIG. 14 is a schematic diagram of a data structure of an embodiment of the present disclosure;

15 is a schematic diagram of a data structure of an embodiment of the present disclosure;

16 is a schematic diagram of a data structure of an embodiment of the present disclosure;

FIG. 17 is a schematic flowchart 1 of a method for configuring a demodulation reference signal according to an embodiment of the present disclosure;

FIG. 18 is a second schematic flowchart of a method for configuring a demodulation reference signal according to an embodiment of the present disclosure;

FIG. 19 is a first schematic structural diagram of an apparatus for configuring a demodulation reference signal according to an embodiment of the present disclosure;

FIG. 20 is a second structural diagram of an apparatus for configuring a demodulation reference signal according to an embodiment of the present disclosure;

FIG. 21 is a schematic diagram of frequency division multiplexing of DMRS and data according to an embodiment of the present disclosure; FIG.

FIG. 22 is a schematic diagram of a DMRS occupying one or two columns of time domain symbols according to an embodiment of the present disclosure; FIG.

FIG. 23 is a schematic diagram of different DMRS ports corresponding to different DMRS patterns according to an embodiment of the present disclosure; FIG.

Figure 24a is a schematic diagram 1 of a time slot according to an embodiment of the present disclosure;

Figure 24b is a second schematic diagram of a time slot according to an embodiment of the present disclosure;

Figure 24c is a schematic diagram of a time slot of the embodiment of the present disclosure;

FIG. 25 is a diagram showing different DMRS subset spacings corresponding to different slot structures according to an embodiment of the present disclosure; intention;

26 is a schematic diagram of a DMRS pattern of two symbols of an embodiment of the present disclosure.

detailed description

The embodiments of the present disclosure are described in detail with reference to the accompanying drawings.

A time slot in the present disclosure may refer to a minimum time unit scheduled at one time, and is composed of multiple time domain symbols, such as multiple Orthogonal Frequency Division Multiplexing (OFDM) symbols. A time slot can also refer to one subframe.

In the technical solution of the embodiment of the present disclosure, the time domain location or the other parameters such as the pattern of the demodulation reference signal are implicitly indicated by the indication signaling of the positive/negative acknowledgement (ACK/NACK) feedback delay; The cell length, frequency domain length, etc., implicitly indicate the density and/or pattern of the demodulation reference signal. The signaling indicating the number of demodulation reference signal ports indicates whether the demodulation reference signal is continuous or discontinuous in the frequency domain. The first communication node indicates an orthogonal code length used to demodulate the reference signal by indicating one or more of the following signaling. Signaling indicating a length of the time domain scheduling symbol, signaling indicating a maximum length of the orthogonal code, signaling indicating the parameter of the demodulation reference signal. For the multi-segment cascaded ZC sequence method, the root sequence on different subbands, the cyclic shift sequence, the pattern can be different, and jump over time. In addition, two or more sub-band lengths can be supported.

The first communication node in the embodiment of the present disclosure refers to a base station, a cell, and the like, and of course, other devices are not excluded. The second communication node generally refers to a user terminal or the like.

A method for configuring a demodulation reference signal according to an embodiment of the present disclosure includes:

The first communication node indicates to the second communication node the parameters used for demodulating the reference signal by preset signaling. The parameters used for demodulating the reference signal include one or more of a sequence of a demodulation reference signal, a time domain position, a pattern, a density, an orthogonal code length, a root sequence, a cyclic shift sequence, and a number of ports. . The preset signaling here may be radio resource control (RRC, Radio) Resource Control) High-level signaling, which can also be predefined information, can be physical layer dynamic signaling. The sequence of the demodulated reference signal generally refers to a PN sequence or a ZC sequence. The time domain location refers to which time domain symbol in the demodulation reference signal is located in a time domain unit. For example, the left and right diagrams of FIG. 3 refer to different demodulation reference signal time domain settings. The density of the demodulation reference signal refers to the number of reference signals in a time-frequency resource, such as a resource block (RB, Resource Block). For the length of the orthogonal code, if it is an OCC code, the length is 2, The sequence [1 1] and [1 -1] are included, and the OCC can be used to distinguish two users. And if the length of the OCC code is 4, then the OCC sequence includes [1 1 1 1], [1 -1 1 -1], [1 1 -1 -1], and [1 -1 -1 1], which can be used. To distinguish 4 users. Of course, the orthogonal code can also be other codes, such as DFT codes, such as length 3, including [1 1 1], [1 exp(j*2*pi/3) exp(j*2*pi*2/ 3)], [1 exp(j*2*pi*2/3) exp(j*2*pi*4/3)], three users can be multiplexed using DFT orthogonal codes. In the embodiment of the present disclosure, when the orthogonal code length is 1, that is, there is no orthogonal code, the orthogonal code sequence of length 1 may be considered as [1]. If there are two time domain symbols of the demodulation reference signal (DMRS, Demodulation Reference Signal), orthogonality of length 2 can be performed on the REs of the same subcarrier on the two time domain symbols, as shown in FIG. The code used by User 1 on two different time domain symbols on the same subcarrier is [1 1], while User 2 uses [1 -1].

The first communication node instructs the second communication node to indicate a parameter used for demodulating the reference signal by signaling indicating an ACK/NACK feedback delay. Due to the current flexible A/N feedback delay configuration is very popular. The base station schedules downlink data in the time slot n, and after the k time slots, that is, the time slot n+k, the user will feedback to the base station whether the data is demodulated correctly or not. The value of k can be semi-statically configured or dynamically configured. If the value of k is relatively small, such as k=0, then A/N feedback and data scheduling will be in one time slot, and the user needs to quickly demodulate the data. At this time, it is better that the demodulation reference signal is located at the front end of one subframe. If the user has sufficient time to demodulate the data, that is, the value of k is large, the position of the demodulation reference signal can be placed in the middle of the time slot, which is advantageous for channel estimation.

The preset signaling is used to indicate a demodulation reference when demodulating the reference signal pattern. The type of sequence used by the signal. Since the ZC sequence is preferably transmitted continuously, or at equal intervals, the interval is preferably not too large. If the frequency range of the DMRS pattern configured by the base station to the user is too large, the sequence may not be a ZC sequence by default. Since the uplink supports both cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveforms and discrete Fourier transform spread spectrum orthogonal frequency division multiplexing (DFT-S-OFDM) waveforms, DMRS The PN sequence is used in the CP-OFDM mode (similar to the sequence adopted by the LTE downlink DMRS), and two consecutive OFDM symbols can be used for uplink DMRS transmission to support multi-user multiplexing because 2 consecutive OFDM symbols can support More multi-users. However, the ZC sequence may be adopted in the DFT-S-OFDM mode, but it may not be necessary to support multi-user scheduling, or it is not necessary to schedule too many users at the same time. In this case, two consecutive time domain symbols are not required to transmit the DMRS. Therefore, the preset signaling is used to indicate the type of sequence used to demodulate the reference signal when demodulating the reference signal pattern. The pattern of the demodulation reference signal refers to whether two consecutive time domain symbols are supported to transmit the DMRS.

Other parameters may also be implicitly indicated to indicate the sequence type of the demodulation reference signal. For example, the signaling of frequency domain resource allocation is used to implicitly indicate the length of the ZC sequence. Different frequency domain resource allocation modes indicate different sequences. For example, if the resources allocated by the base station to the user by using a certain resource allocation mode are continuous in the frequency domain, or are divided into multiple segments in the frequency domain, and each segment is continuous, then the resource allocation is performed. The sequence corresponding to the mode is the ZC sequence. And if the resource allocation method is discrete, then the corresponding PN sequence. Or determine whether it is a ZC sequence according to the length of the frequency domain resource allocation.

The preset signaling is used to indicate the number of demodulation reference signal ports, and is also used to indicate whether the transmission of the demodulation reference signal in the frequency domain is continuous or discontinuous. That is to say, whether the demodulation reference signal is continuously transmitted in the frequency domain or discrete transmission is related to the number of DMRS ports or the number of layers of data.

The preset signaling is used to indicate the demodulation reference signal pattern or density, and is also used to indicate the orthogonal code length used for demodulating the reference signal.

The first communication node indicates a demodulation reference by indicating one or more of the following signaling The orthogonal code length used by the signal.

Signaling indicating a length of the time domain scheduling symbol, signaling indicating a maximum length of the orthogonal code, signaling indicating the parameter of the demodulation reference signal.

Or it can be said that the preset signaling is used to indicate the orthogonal code length used for demodulating the reference signal, and is also used to indicate the demodulation reference signal pattern or density. That is, the base station carries the information of the demodulation reference signal pattern with some signaling, and also carries the information of the orthogonal code length of the demodulation reference signal. That is to say, the orthogonal code length used by the DMRS is related to the pattern of the demodulation reference signal, the density, the length of the time domain scheduling unit, the maximum length of the configured orthogonal code, and the like.

In the NR, the pattern of the DMRS may be configurable, that is, the base station may configure multiple DMRS patterns for the user, and different DMRS patterns may have different time-frequency densities or occupy different time-frequency resources. Then the length setting range of the orthogonal code is also related to the pattern of the DMRS. For example, in a time slot, if there is only one column of DMRS, the length of the orthogonal code in the time domain is 1, that is, it is impossible to distinguish orthogonal DMRS ports or users in the time domain by using orthogonal codes. If a time slot has two columns of DMRS, an orthogonal code of length 2 can be utilized in the time domain.

In addition, since the primary scheduling resource in the NR may include one or more time slots, the number of DMRS columns included in the primary scheduling unit is related to the number of time slots included in the scheduling unit, and also the DMRS included in one time slot. The number is related. Therefore, the length of the orthogonal code that can be used in the time domain cannot exceed the number of DMRS columns included in one scheduling unit. Since the speed of the user is different, the fast user has a fast channel change in the time domain, so the number of DMRS columns included in the time domain orthogonal code cannot be excessive, even if the scheduling unit allocated by the user is long. Therefore, the base station can give the user a maximum orthogonal code length in a semi-static configuration. If the number of DMRS time domain symbols included in the scheduling unit allocated by the user is smaller than the length of the largest orthogonal code, the orthogonal code used by the actually transmitted DMRS is used. The length is the number of DMRS symbols included in the scheduling unit. And if the number of DMRS time domain symbols included in the scheduling unit assigned by the user is greater than the length of the largest orthogonal code, then the user follows The maximum orthogonal code length set by the base station to transmit the DMRS or receive the DMRS.

The preset signaling is used to indicate the density and/or pattern of the demodulation reference signal, and is also used to indicate scheduling resources. That is to say, the density of the demodulation reference signal, and/or the pattern is related to the signaling of the allocated resource, for example, the size of the allocated resource includes the length of the time domain and the length of the frequency domain. For example, if the length of the time domain unit allocated by the base station when scheduling the user is one time slot, it is better to place more than one time domain symbol demodulation reference signal in the time slot, which is advantageous for the receiver to estimate more. Pule frequency shift and frequency offset estimation. If the base station schedules users to allocate multiple slots at a time, then some reference signals may be placed with less time domain symbols. For example, the allocation mode of resource scheduling, such as whether it is discretely allocated or continuously allocated in the frequency domain, also indicates the pattern of the DMRS.

The first communication node indicates a pattern used to demodulate the reference signal by indicating one or more of the following signaling, density and/or sequence: signaling indicating a modulation and coding mode, signaling indicating a transmission mode, and retransmission indication Signaling, receiving mode. That is to say, the user can use the MCS signaling configured by the base station, and the transmission mode signaling, such as open loop multiplexing, closed loop multiplexing, and transmit diversity, and the transmission mode is different, whether the data is retransmitted, and the receiving mode of the user is different. Get some information about the pattern or sequence of the DMRS.

The first communication node is configured by the high-level signaling to the second communication node for multiple demodulation reference signal parameters or configured by a high-level signaling from a predefined plurality of demodulation reference signal patterns to a part of the second communication node. And, the first communication node notifies, by dynamic signaling, which parameter or pattern of the demodulation reference signal used by the second communication node is the higher layer signaling.

Generally, in order to adapt to different application scenarios, the demodulation reference signal can have a variety of patterns, density, sequence, orthogonal code length, etc., corresponding to different demodulation reference signal parameters. Such a system can predefine a large DMRS pattern or set of parameters, and this DMRS set can contain all patterns, sequences, orthogonal code lengths, and the like. Since different user channel conditions are different, the base station can semi-statically select a DMRS subset from the set through high-level signaling, and the subset includes some DMRS patterns suitable for the user, and/or density, time-frequency domain. Location, and / Or sequence, and/or orthogonal code length, and the like. In actual scheduling, the base station needs to dynamically inform the user which DMRS parameter or pattern used in a certain scheduling unit is a subset of the higher layer signaling configuration.

The bandwidth used for demodulation reference signal transmission can be divided into several sub-bands. Each subband is a complete sequence.

The preset signaling is used to indicate that the demodulation reference signal is used in a subsequence used on a subband of a transmitting unit, and is also used to indicate different subbands of the demodulation reference signal on the same transmitting unit, and/ Or the same sub-bands of different transmitting units, and/or root sequences used on different sub-bands of different transmitting units;

Wherein, the root sequences on different sub-bands are different or the same; the root sequences on the same sub-band of different transmitting units are different or the same.

The preset signaling is used to indicate that the demodulation reference signal is used in a cyclic shift sequence used on a subband of a transmitting unit, and is also used to indicate different subbands of the demodulation reference signal on the same transmitting unit, And/or different sub-bands of different transmitting units, and/or cyclic shift sequences used on different sub-bands of different transmitting units;

Wherein, the order of the cyclic shift sequences on different sub-bands is different or the same; wherein, the order of the cyclic shift sequences on the same sub-band of different transmitting units is different or the same.

The preset signaling is used to indicate the code sequence number used by the demodulation reference signal on a subband of a transmitting unit, and is also used to indicate different subbands of the demodulation reference signal on the same transmitting unit, and/ Or the same sub-bands of different transmitting units, and/or the number of patterns used on different sub-bands of different transmitting units;

The sequence numbers of the different sub-bands are different or the same; wherein the code numbers on the same sub-bands of different transmission units are different or the same.

In general, in this case, each sub-band uses a ZC sequence. Thus, the base station can define that the minimum frequency domain resource allocated by each user is 1 sub-band. So, users can be based on allocated resources The subband position gets the corresponding DMRS sequence.

The first communication node uses the signaling to indicate that the bandwidth used by the second communication node to demodulate the reference signal transmission supports multiple partitioning methods according to different sub-band lengths.

If the subband division is too small, the characteristics of the ZC sequence will be destroyed. If the subband is too large, the minimum scheduling frequency domain unit is too large, and the user base stations of some small packet services can only allocate too many resources to them. This will waste resources.

The embodiment of the present disclosure is not limited to the demodulation reference signal, and the disclosure related to the embodiment 5 can also be applied to the uplink sounding reference signal as well.

The embodiments of the present disclosure are also not limited to the uplink description or the downlink transmission.

The sequences of the embodiments of the present disclosure are also not limited to the ZC sequence and the PN sequence. Especially for the contents of the embodiments 1 to 4.

FIG. 17 is a first schematic flowchart of a method for configuring a demodulation reference signal according to an embodiment of the present disclosure. As shown in FIG. 17, the method for configuring a demodulation reference signal includes:

Step 1701: The first communication node indicates, by using preset signaling, the second communication node, the parameter used for demodulating the reference signal, where the parameter used for demodulating the reference signal includes at least one of the following: a sequence of demodulating the reference signal Type, time domain position, pattern, density, orthogonal code length, root sequence, cyclic shift sequence, number of ports, number of time domain symbols, and indication information whether or not to transmit simultaneously with data.

In an embodiment of the present disclosure, the first communication node instructs the second communication node to indicate a parameter used for demodulating the reference signal by signaling indicating a positive/negative acknowledgement ACK/NACK feedback delay.

In the embodiment of the present disclosure, the preset signaling is used to indicate the type of the sequence used for demodulating the reference signal when demodulating the reference signal pattern.

In the embodiment of the present disclosure, when the preset signaling is used to indicate the number of demodulation reference signal ports, it is also used to indicate whether the transmission of the demodulation reference signal in the frequency domain is continuous or discontinuous.

In the embodiment of the present disclosure, when the preset signaling is used to indicate the demodulation reference signal pattern or density, it is also used to indicate the orthogonal code length used for demodulating the reference signal.

In an embodiment of the present disclosure, the first communication node indicates an orthogonal code length used for demodulating the reference signal by indicating at least one of the following:

Signaling indicating the length of the time domain scheduling symbol, signaling indicating the maximum length of the orthogonal code, signaling indicating the parameter of the demodulation reference signal.

In the embodiment of the present disclosure, when the preset signaling is used to indicate the density and/or pattern of the demodulation reference signal, it is also used to indicate scheduling resources.

In the embodiment of the present disclosure, the preset signaling is used to indicate a format of the demodulation reference signal, and is also used to indicate a slot structure, where the pattern of the demodulation reference signal includes at least one of the following:

The time domain position of the demodulation reference signal subset, the number of time domain symbols, the number of orthogonal ports that can support the maximum, and the number of subsets included in the demodulation reference signal.

In an embodiment of the present disclosure, the first communication node indicates, by indicating at least one of the following signaling, a pattern and/or a density and/or a sequence and/or a number of time domain symbols used for demodulating the reference signal and/or whether Simultaneous transmission with data:

Signaling indicating modulation and coding mode, signaling indicating transmission mode, retransmission indication signaling, and receiving mode;

The pattern of the demodulation reference signal includes at least one of the following:

The number of time domain symbols, whether or not the information is transmitted simultaneously with the data.

In the embodiment of the present disclosure, the preset signaling is used to indicate the multiplexing mode of the plurality of ports of the demodulation reference signal on the time domain symbol and/or the mode of demodulating the reference signal, and is also used to indicate the phase noise. Whether the reference signal exists;

The multiplexing mode refers to time division multiplexing or code division multiplexing.

In the embodiment of the present disclosure, the first communication node indicates that the density and/or the orthogonal code length of the demodulation reference signal corresponding to the different demodulation reference signal groups of the second communication node are different by signaling;

The different demodulation reference signal groups correspond to at least one of the following: different resource groups, different demodulation reference signal ports, different transmission codewords, and different transmission layers.

In the embodiment of the present disclosure, the first communication node configures, by using the high layer signaling, a plurality of demodulation reference signal parameters to the second communication node; or, by using the high layer signaling, is configured from the predefined multiple demodulation reference signal patterns. A portion of the second communication node is patterned, and the first communication node notifies which of the higher layer signaling the parameter or pattern of the demodulation reference signal used by the second communication node is dynamically signaled.

In the embodiment of the present disclosure, the bandwidth for demodulating the reference signal transmission may be divided into a plurality of sub-bands, wherein each sub-band is a complete sequence.

In the embodiment of the present disclosure, the preset signaling is used to indicate that the demodulation reference signal is used on the same transmitting unit when the root sequence used on one subband of one transmitting unit is used. Different sub-bands, and/or different sub-bands of different transmitting units, and/or root sequences used on different sub-bands of different transmitting units;

In the embodiment of the present disclosure, the preset signaling is used to indicate that the demodulation reference signal is in the same transmission unit when the cyclic shift sequence used on one subband of one transmitting unit is used. Different sub-bands on, and/or different sub-bands of different transmitting units, and/or cyclic shift sequences used on different sub-bands of different transmitting units;

In the embodiment of the present disclosure, the preset signaling is used to indicate that the demodulation reference signal is on the same transmitting unit when the pattern number used on one subband of one transmitting unit is used. Different sub-bands, and/or different sub-bands of different transmitting units, and/or pattern numbers used on different sub-bands of different transmitting units;

In the embodiment of the present disclosure, the first communication node uses the signaling to indicate that the bandwidth used by the second communication node for demodulation reference signal transmission supports multiple division methods according to different subband lengths.

FIG. 18 is a second schematic flowchart of a method for configuring a demodulation reference signal according to an embodiment of the present disclosure. As shown in FIG. 18, the method for configuring a demodulation reference signal includes:

Step 1801: The second communication node determines a parameter used for demodulating the reference signal by receiving preset signaling sent by the first communication node, where the parameter used for demodulating the reference signal includes at least one of: demodulation The type of the reference signal, the time domain position, the pattern, the density, the orthogonal code length, the root sequence, the cyclic shift sequence, the number of ports, the number of time domain symbols, and whether or not the information is transmitted simultaneously with the data.

In an embodiment of the present disclosure, the second communication node determines a parameter of the demodulation reference signal by signaling from the first communication node for indicating a positive/negative acknowledgement ACK/NACK feedback delay.

In an embodiment of the present disclosure, the second communication node determines the type of sequence used by the demodulation reference signal by signaling from the first communication node for indicating a demodulation reference signal pattern.

In an embodiment of the present disclosure, the second communication node determines whether the demodulation reference signal is continuously or discontinuously transmitted in the frequency domain by signaling from the first communication node for indicating the number of demodulation reference signal ports. .

In an embodiment of the present disclosure, the second communication node determines an orthogonal code length used by the demodulation reference signal by signaling from the first communication node for indicating a demodulation reference signal pattern and/or density; or ,

The second communication node determines a demodulation reference signal pattern and/or density by signaling from the first communication node indicating the orthogonal code length used by the demodulation reference signal.

In the embodiment of the present disclosure, the second communication node passes the following from the first communication node. At least one indication signaling to determine an orthogonal code length used to demodulate the reference signal:

In an embodiment of the present disclosure, the second communication node determines the density and/or pattern of the demodulation reference signal by signaling from the first communication node to indicate scheduling resources.

In an embodiment of the present disclosure, the second communication node determines the density and/or the number of patterns and/or time domain symbols of the demodulation reference signal and/or the at least one signaling from the first communication node. Whether to transmit at the same time as the data:

Signaling indicating modulation and coding mode, signaling indicating transmission mode, retransmission indication signaling, and receiving mode.

In the embodiment of the present disclosure, the second communication node receives the signaling of the first communication node, indicating that the density and/or the orthogonal code length of the demodulation reference signal corresponding to different demodulation reference signal groups are different;

In the embodiment of the present disclosure, the second communication node receives multiple demodulation reference signal parameters configured by the first communication node by using high layer signaling, or pre-defined multiple demodulation reference signal patterns by high layer signaling. And configuring a part of the pattern of the second communication node, and the second communication node knows which one of the high layer signaling is the parameter or pattern of the demodulation reference signal by dynamic signaling from the first communication node.

In the embodiment of the present disclosure, the bandwidth for demodulating the reference signal transmission is divided into a number of sub-bands, wherein each sub-band is a complete sequence.

In an embodiment of the present disclosure, the second communication node determines the demodulation reference signal by signaling from a first sequence used by the first communication node to indicate that the demodulation reference signal is used on one of the sub-bands of one of the receiving units. Different sub-bands on the same receiving unit, and/or different sub-bands of different receiving units, and/or root sequences used on different sub-bands of different receiving units;

Wherein, the root sequences on different sub-bands are different or the same; wherein the root sequences on the same sub-band of different receiving units are different or the same.

In an embodiment of the present disclosure, the second communication node determines demodulation by signaling from a first communication node for indicating a cyclic shift sequence used by the demodulation reference signal on one of the one of the receiving units. a cyclic shift sequence used by different subbands of the reference signal on the same receiving unit, and/or the same subband of different receiving units, and/or different subbands of different receiving units;

Wherein, the order of the cyclic shift sequences on different sub-bands is different or the same; wherein the order of the cyclic shift sequences on the same sub-band of different receiving units is different or the same.

In an embodiment of the present disclosure, the second communication node determines a demodulation reference signal by signaling from a first communication node for indicating a pattern number used by the demodulation reference signal on one of the one of the receiving units. Different sub-bands on the same receiving unit, and/or different sub-bands of different receiving units, and/or pattern numbers used on different sub-bands of different receiving units;

The numbers of the patterns on the different sub-bands are different or the same; wherein the numbers of the patterns on the same sub-bands of different receiving units are different or the same.

In an embodiment of the present disclosure, the second communication node determines the used subband division method according to the indication signaling from the first communication node.

The method for configuring the demodulation reference signal in the embodiment of the present disclosure is further described in detail below with reference to specific application scenarios.

Example 1

The first communication node instructs the second communication node to indicate parameters used for demodulating the reference signal, including a pattern, a density, a time domain location, a frequency domain location, and the like, by signaling indicating an A/N feedback delay. Due to the current flexible A/N feedback delay configuration is very popular. The base station schedules downlink data in slot #n, and after the k time slots, that is, the time slot #n+k, the user will feedback to the base station whether the data is demodulated correctly or not. The value of k can be semi-statically configured or dynamically configured. If the value of k is relatively small, such as k=0, then A/N feedback and data scheduling will be in one time slot, requiring the user to quickly demodulate the data. It is better to have the test signal at the front end of a sub-frame. If the user has sufficient time to demodulate the data, that is, the value of k is large, the position of the demodulation reference signal can be placed in the middle of the time slot, which is advantageous for channel estimation.

That is to say, the value of k is related to the time domain position of the demodulation reference signal, the pattern, and the like.

As shown in FIG. 7, at time slot #n, if the base station schedules transmission of the current time slot, and the base station dynamically configures the value of configuration k in the physical layer control channel, if the value of k is equal to 0, the demodulation reference signal will It will be sent at the front end of the time slot, otherwise the demodulation reference signal will be sent in the middle of the time slot. Of course, the value of k can be semi-statically configured for higher layer signaling.

The base station can set a k_throushold. If the value of k is less than k_throushold, the demodulation reference signal is at the front end of the time slot, otherwise at a certain position in the middle of the time slot. The k_throushold values of different users can be different, relying on semi-static high-level signaling configuration.

Relying on the value of k to infer the time domain position of the reference signal, such as patterns, can save signaling overhead without losing flexibility.

It should be noted that the embodiment of the present disclosure uses the k value to indicate the DMRS pattern or the time domain location, and may indicate explicit parameters such as the DMRS pattern in combination with explicit signaling or other implicit signaling. For example, if a user is configured with multiple DMRS patterns, the DMRS pattern can be divided into multiple collections, such as two. Implicitly indicating a certain set with a k value, and then using the dynamic information in the DCI to indicate a certain pattern in the set. As shown in Figure 10a. The user is configured with 4 patterns, the smaller k value can implicitly indicate

Pattern

1 and 2, and the larger k value can implicitly indicate

Pattern

3 and 4. Thus, if k=0, then the user can know that it is

DMRS pattern

1 or 2, and the base station needs to indicate whether it is

Pattern

1 or 2 with an additional 1 bit.

Example 2

When the preset signaling is used to indicate the number of demodulation reference signal ports, it is also used to indicate whether the transmission of the demodulation reference signal in the frequency domain is continuous or discontinuous, that is, the first communication node. Demodulating the reference signal to the second communication node by signaling indicating the number of demodulation reference signal ports Whether the transmission in the frequency domain is continuous or non-continuous. That is to say, whether the demodulation reference signal is continuously transmitted in the frequency domain or discrete transmission is related to the number of DMRS ports or the number of layers of data.

The uplink DMRS of LTE uses a ZC sequence, that is, on a scheduling frequency domain segment, the DMRS on a time domain symbol must be continuously transmitted. The DMRS sequence of one user in the interleaved frequency division multiple access (IFDMA) scheme can be sent at equal intervals, similar to the uplink sounding reference signal (SRS), as shown in the right figure of FIG.

Generally, when performing low rank scheduling, the delay spread is small, and in the case of high rank scheduling, the delay spread is large and the channel frequency selectivity is increased.

For some delay spreads are small, and the rank is relatively small, RS needs power boosting users. For example, for uplink, when rank<=2, IFDMA scheme can be used, that is, discontinuous transmission; rank=3or 4, continuous DRMS scheme can be adopted. . This is because when rank=4, continuous transmission assumes that the channels in each of the four consecutive frequency domains are the same for orthogonality, and if the IFDMA scheme is used, it is assumed that every eight consecutive RE channels are identical to be orthogonal. .

For example, if the DCI is notified in the DCI that the DMRS port>=3, that is, the DMRS is continuously transmitted in the frequency domain, the CS field indicator indicates that reference can be made to the chart 2. If DMRS port<=2, it means that the DMRS uses the IFDMA scheme in the frequency domain, refer to Table 1. Because the CS indication in Table 1 is repeated. Where comb## indicates that the DMRS reference signal occupies an even subcarrier, and comb#1 indicates that the reference signal occupies an odd subcarrier.

Refers to the cyclic shift, the meaning is the same as in LTE.

Table 1

Table 2

Example 3

The preset signaling is used to indicate the density and/or the pattern of the demodulation reference signal, and is also used to indicate the scheduling resource, that is, the first communication node sends the signaling to the second communication node by indicating the scheduling resource. Indicates the density and/or pattern of the demodulated reference signal.

That is, the density of the demodulation reference signal, and/or the pattern is related to the signaling of the allocated resources. For example, if the length of the time domain unit allocated by the base station when scheduling the user is one time slot, it is better to place more than one time domain symbol demodulation reference signal in the time slot, which is advantageous for the receiver to estimate more. Pule frequency shift and frequency offset estimation. If the base station schedules users to allocate multiple slots at a time, then some slots can be placed with less reference time-domain symbols instead of the same DMRS for each slot.

For example, different scheduling unit lengths configure different DMRS patterns, and one or more equally spaced DMRS time domain symbols can be used to transmit DMRS. If the user channel is slower, the base station If a time slot is scheduled, then a DMRS can be placed at the front end of the time slot, as shown in the upper figure of FIG. If the time slot scheduled by the base station is 3slots, only the DMRS may be placed on the first time domain symbol of the scheduling unit. Because the channel is slowly changed, too many DMRSs are not needed, as shown in the following figure.

A variety of DMRS patterns are shown in Figure 8 below, Figure 9-a, and Figure 9-b. The DMRS is placed only on one OFDM symbol of the scheduling time unit; in the scheduling time unit, the first time domain symbol is used as the starting position, two DMRSs are placed at equal intervals; in the scheduling time unit, the first The OFDM symbols are the starting positions, and three DMRSs are placed at equal intervals.

Optionally, the base station may configure multiple sets of DMRS patterns for each scheduling unit, and the multiple sets of DMRS patterns include DMRS configurations with different time domain densities, wherein each set of DMRS configurations includes one or more equally spaced time domain symbols available for The DMRS is sent, and the DMRS pattern used in the current scheduling time unit is notified through high layer signaling or physical layer dynamic signaling. For example, as described above, there are multiple DMRS patterns for the three slots, and then the base station notifies which type of the three slots are scheduled by signaling. Equally spaced DMRS placement refers to placing the DMRS at equal intervals before the end of the data channel in a scheduling unit, starting from the first time domain symbol of the data channel.

For example, different scheduling time unit lengths or data channel lengths are bound to different DMRS pattern sets, for example:

It is assumed that the scheduling time unit length or the data channel length is N OFDM symbols,

When the scheduling time unit/data channel length is [1, n1] OFDM symbols, corresponding to the DMRS pattern set 1;

When the scheduling time unit/data channel length is [n1+1, n2] OFDM symbols, corresponding to the DMRS pattern set 2;

When the scheduling time unit/data channel length is [n2+1, N] OFDM symbols, the corresponding DMRS pattern set is 3.

Under each DMRS pattern set, the DMRS pattern specifically used in the current scheduling time unit is notified by DCI.

Include at least one DMRS pattern in each DMRS pattern set;

One or more equally spaced OFDM symbols are included in each DMRS pattern for transmitting DMRS. Preferably, the DMRS may be mapped in equally spaced subcarriers in the OFDM symbol.

Where n1, n2 are positive integers less than N, and the values of n1, n2 are predefined or notified by broadcast/RRC signaling.

The DMRS pattern can be divided into multiple sets, and different resource allocation sizes or allocation manners can correspond to different DMRS pattern sets. Including time domain, the size and mode of resource allocation in the frequency domain.

For example, different DMRS pattern sets may be corresponding to different frequency domain resource sizes allocated by the scheduling unit. For example, the DMRS pattern includes four types, as shown in Figure 10a. If the resources allocated in the frequency domain are large, or exceed a threshold, channel estimation interpolation can be performed in the frequency domain, and the

DMRS patterns

2 and 4 can be correspondingly, that is, the density in the frequency domain can be reduced. Otherwise it is

pattern

2 or 4. After the DMRS pattern set is determined, other implicit or clear signaling indications may be required to be which of the sets.

In addition, whether to perform PRB binding during scheduling, and the length of the bound PRB can also be used to implicitly indicate the DMRS pattern. The PRB binding means that the precoding used in the scheduling of the N PRBs is the same, or approximate, so that the channel estimates on the DMRS or data of different PRBs can be interpolated, otherwise the channel interpolation must be performed in the PRB.

Example 4

The preset signaling is used to indicate the demodulation reference signal pattern or density, and is also used to indicate the orthogonal code length used for demodulating the reference signal, that is, the first communication node is used to give the second The signaling by the communication node indicating the demodulation reference signal pattern or density may also be used to indicate the orthogonal code length used to demodulate the reference signal.

The first communication node indicates an orthogonal code length used to demodulate the reference signal by indicating one or more of the following signaling.

Signaling indicating a length of the time domain scheduling symbol, signaling indicating a maximum length of the orthogonal code, signaling indicating the parameter of the demodulation reference signal. The length of the time domain scheduling symbol may refer to the length of the time domain scheduling unit, that is, the number of time slots included in a time domain scheduling unit, or the number of subframes. The time domain scheduling symbol length may also refer to the number of time domain symbols included in the primary scheduling, such as the number of OFDM symbols, and may also refer to the number of DMRS time domain symbols included in a time domain scheduling unit.

Or it may be said that the orthogonal code length used by the first communication node to indicate to the second communication node to demodulate the reference signal may also be used to indicate the demodulation reference signal pattern or density. That is, the base station uses some signaling to carry both the information of the demodulation reference signal pattern and the information of the orthogonal code length of the demodulation reference signal.

That is to say, the orthogonal code length used by the DMRS is related to one or more of the pattern of the demodulation reference signal, the density, the length of the time domain scheduling unit, and the maximum length of the configured orthogonal code. That is to say, the orthogonal code length used by the DMRS is related to the above parameters, but may not be completely dependent on these parameters, or may be combined with clear signaling and these parameters to determine the pattern position of the DMRS.

In the NR, the pattern of the DMRS may be configurable, that is, the base station may configure multiple DMRS patterns for the user, and different DMRS patterns may have different time-frequency densities or occupy different time-frequency resources. For example, the DMRS pattern set in a slot is as shown in Figure 10a. There are 4 patterns in it. The base station may configure one of them using dynamic DCI signaling or high layer RRC signaling. If

pattern

1 or 2 is configured, then if the DMRS joint orthogonal code between slots is not considered, only one column of DMRS symbols cannot use the time domain orthogonal code, that is, the orthogonal code in the time domain. The length is equal to 1. At this time, the orthogonal code length in the frequency domain may also require other explicit signaling or implicit indication to the user. For example, if the base station informs the user that it is pattern 1, the orthogonal code length in the frequency domain may be one of 1, 2, 3, 4, or one of 1, 2, 4, or 2, 4 One of them must be notified to the user with other signaling. If the predefined specification or higher layer signaling informs that the time domain orthogonal code can only be used in one time slot, as shown in Figure 10a, if the base station gives If the user configures

DMRS pattern

3 or 4, the length of the orthogonal code in the time domain is 2. The orthogonal codes used by the DMRSs of the two ports on the two columns of RS are [1 1] and [1 -1], respectively. If the base station configures the user with

DMRS pattern

1 or 2, the orthogonal code length used in the domain is 1.

The length of the orthogonal code can be considered separately in the time domain, or the frequency domain can be considered separately. As shown in FIG. 10a, if the base station is configured with

pattern

1 or 3 of the user, the length of the orthogonal code in the frequency domain can be considered to be 4, that is, every 4 consecutive subcarriers in the frequency domain are orthogonal. As shown in FIG. 10b, four ports or users can be distinguished in the frequency domain by orthogonal codes of length 4, and the orthogonal codes of the four ports on consecutive four REs are [1 1 1 1], respectively. [1 -1 1 -1], [1 -1 -1 1], [1 1 -1 -1]. Since the four REs are continuous in the frequency domain, the channels are relatively similar, and the orthogonal code having a length of 4 is better. This situation applies to the case where the number of DMRS ports is relatively large, or the number of users is relatively large when multi-user multiplexing. If the number of users is relatively small, or the number of ports is relatively small, the density of the DMRS is not so dense in the frequency domain, and the base station can be configured to the

user DMRS pattern

2 or 4. Figure 10c. At this time, two consecutive subcarriers are used as orthogonal.

In other words, whether the orthogonal code length of the DMRS transmission is 2 or 4 can be explicitly signaled without signaling or with a small amount of signaling, because the base station can implicitly inform the user by using signaling indicating the DMRS pattern. Information about the length of the code. Of course, once the length of the orthogonal code is determined, for example, 2, then whether the sequence of the orthogonal code is [1 1] or [1 -1] still needs to be signaled.

Of course, the length of the orthogonal code can be considered in conjunction with the time domain and the frequency domain. For different DMRS patterns, the joint orthogonal code length is different. As shown in FIG. 10a, if the base station is configured to the user DMRS pattern 4, according to the above, since the time domain can be an orthogonal code of length 2, and the frequency domain can also be an orthogonal code of length 2, if integrated Considering the time-frequency domain, the length of the orthogonal code is 4. In the 4 REs as shown in FIG. 10d (2 in the time domain and 2 in the frequency domain), an orthogonal code of length 4 can be used to distinguish up to 4 DMRS ports or users.

However, since the primary scheduling resource in the NR may include one or more time slots, the number of DMRS columns included in the primary scheduling unit is related to the number of time slots included in the scheduling unit, and is also related to The number of DMRSs included in each slot is related. Therefore, the length of the orthogonal code that can be used in the time domain cannot exceed the number of DMRS columns included in one scheduling unit. Since the speed of the user is different, the fast user has a fast channel change in the time domain, so the number of DMRS columns included in the time domain orthogonal code cannot be excessive, even if the scheduling unit allocated by the user is long. Therefore, the base station can give the user a maximum orthogonal code length in a semi-static configuration. If the number of DMRS time domain symbols included in the scheduling unit allocated by the user is less than the length of the largest orthogonal code, the time domain of the actually transmitted DMRS is positive. The cross code length is the number of DMRS symbols included in the scheduling unit. If the number of DMRS time domain symbols included in the scheduling unit allocated by the user is greater than the length of the largest orthogonal code, the user transmits the DMRS or receives the DMRS according to the maximum orthogonal code length set by the base station.

As described above, since the base station may schedule multiple time slots at a time, how to achieve maximum flexibility with less signaling is also a point of the present disclosure. If 1 bit is fixed in the DCI, it indicates whether 1 time slot or 2 time slots in one scheduling, or fixed 2 bits to indicate 1, 2, 3, 4 time slots, or 1, 2, 4, 8 time slots. . Not enough flexibility. Because for some users with large data volume, it may not need to configure 1 time slot or 2 time slots, and 6 time slots are needed, or more time slots need to be scheduled in one scheduling. So a new method is as follows.

The base station can configure different minimum scheduling units for different users through high layer signaling, and the minimum scheduling unit can include, for example, 1, 2, 4, and 8 time slots. Then, with less bits signaling, the user is dynamically notified in the DCI that several minimum scheduling units are scheduled in one scheduling, for example, 2 bits are used to dynamically indicate 1, 2, 4, 8 or 1, 2, 3, 4 minimum scheduling. unit. For example, suppose the base station allocates the UE0 minimum scheduling unit to be 1slot, and the minimum scheduling unit of U1 is 2slots, then for UE0, 2bits (indicating 1, 2, 3, 4 minimum scheduling units) means 1, 2, 3, 4 slots. For U1, 2bits represents 2, 4, 6, and 8 slots scheduling.

The maximum orthogonal code lengths of different user configurations may be different or the same. For example, the predefined time domain orthogonal sequence length of all users is the number of DMRS symbols in a minimum scheduling unit. That is to say, the time domain orthogonal code can only be used in one minimum scheduling unit.

It is of course also possible to limit the orthogonal code in one time slot or in several time slots. Different user orthogonal code lengths are different. That is to say, the base station can be configured by signaling to the user that the time domain orthogonal code can be performed in several time slots. For example, the base station indicates that the user 0 orthogonal code can be used in two time slots through the high layer signaling, and the DCI indicates that the user's DMRS pattern includes two columns of DMRSs, and the scheduling resources allocated to the user for more than two time slots are Then the length of the orthogonal code in the time domain is 4, and if the scheduling resource allocated to the user 1 slot, the orthogonal code length of the time domain is 2. That is to say, the base station can limit the time domain range to which the orthogonal code can be applied by signaling, and then determine the length of the actual transmission of the orthogonal code by using the actual DMRS pattern and scheduling information.

If a scheduling unit contains N slots and a slot contains M DMRS symbols, the length of the orthogonal code such as OCC can be up to N*M. On the one hand, since the OCC length depends on the user's moving speed, the OCC length should not be too long, otherwise the channel estimation accuracy is affected. On the other hand, the introduction of proper OCC can enhance the channel estimation accuracy, and can reuse different sequences (even if the lengths of ZC sequences of two DMRSs are different or different from the sequence), so the introduction of orthogonal codes is also very necessary. . Whether the OCC depends on the DMRS pattern and the scheduling unit length, according to the number of DMRS symbols included in one slot, the scheduling unit length, the maximum OCC length of the RRC configuration, or the number of slots used by the OC configured OCC, these three At least one of the parameters implicitly indicates that the actual OCC length is better. The integrated channel estimation characteristics, standard complexity, and control signaling overhead are analyzed, and the maximum OCC length is 2 or 4. Or the maximum available time slot of the orthogonal code is 1, 2, 4 or 8 time slots. Different user ranges can be different.

It may depend on the number of DMRS symbols in the minimum scheduling unit. Do OCC in a minimum scheduling unit. If a minimum scheduling unit is 2 slots, then the OCC length is equal to the number of DMRS symbols in the two slots.

The maximum OCC length can be configured semi-statically, which is UE specific. For example, the base station configures the user with the maximum orthogonal code length = 2, and if the user only allocates one slot and only one DMRS Symbol, you do not need to do OCC, but if the user allocated resources contain more than 2 DMRS symbols, then you need to do OCC with length 2.

For example, 3 bits are used to inform CS, OCC, and Comb values.

If the LTE uplink DMRS (ZC sequence) is cyclically shifted, the OCC mapping table, if the actual OCC length is equal to 2, is shown in Table 3 below:

table 3

If the actual OCC length is equal to 1, the indication of the OCC value is ignored in Table 3 above, and different DMRS ports can also be multiplexed through the CS.

Example 5

The first communication node is configured to indicate, to the second communication node, signaling of a root sequence used by the demodulation reference signal on a subband of a transmitting unit, and may also be used to indicate that the demodulation reference signal is in the same sending unit Different subbands on, and/or different subunits of different transmission units, and/or root sequences used on different subbands of different transmission units.

Among them, the root sequences on different sub-bands can be different.

Among them, different sending units, the root sequence on the same sub-band can be different.

In general, in this case, each sub-block uses a ZC sequence. Such base station The minimum frequency domain resource that can be defined for each user is 1 subband. Therefore, the user can obtain the corresponding DMRS sequence according to the allocated resource subband position. As shown in Figure 11, for a cell, the root serial number on each block can be different and will change as the slot changes. A transmitting unit may refer to one time slot, one subframe, or multiple time slots, and multiple subframes. Signaling on a subband indicating that the root sequence used on a transmitting unit can be used to indicate the root sequence of all subbands or all subbands on other time slots. For example, the root sequence of all subbands on a time slot is obtained by the cell ID and the slot number. The root sequence on a subband is a function of one or more of a slot number, and/or a subframe number, a subband number, and a cell ID. Therefore, the signaling indicating the root sequence on a subband is the slot number, and/or the subframe number, the subband number, and the cell ID. Wherein, for different subbands, slot numbers, and/or subframe numbers, the cell ID may be shared. For the slot number, subband number, the cell ID can be shared. The root sequence on different sub-bands can change over time, so that sequence interference randomization can be achieved. For different cells, the root sequence on the subbands can be different at the same time.

A baseline order can be configured for the entire bandwidth of all cells. For example, the root sequences of

block #

0, 1...N-1 are

root#

0, 1, 2, ..., N-1, respectively. This order is used as the baseline. Root (ns, cell_ID, block_ID) = mod (ns + cell_ID + baseline order of block_ID, N) on a certain sub-band in a time slot or subframe. Here, the u value corresponding to root#n is not necessarily 0. For example, a total of 25 root values, root#n represents the #n root value.

Alternatively, the RRC signaling may configure the spec_ID instead of the cell_ID. This allows some users of different cells to configure the same spec_ID. If the root sequences are the same, then different cyclic shifts can be relied upon to achieve quadrature.

More flexible, two or more spec_IDs (including cell_ID) can be configured through RRC, and one is dynamically selected by the DCI when the base station schedules or triggers the RS. For example, two edge users of two adjacent cells have the same spec_ID value in the spec_ID, so that if the time-frequency resources overlap At the same time, the DCI triggers the same spec_ID and configures different CS values.

The first communication node is configured to indicate to the second communication node, the signaling of the cyclic shift sequence used by the demodulation reference signal on a subband of a transmitting unit, and may also be used to indicate that the demodulation reference signal is the same Different sub-bands on the transmitting unit, and/or different sub-bands of different transmitting units, and/or cyclic shift sequences used on different sub-bands of different transmitting units.

Wherein, the order of the cyclic shift sequences on different sub-bands may be different.

Wherein, the order of the cyclic shift sequences on the same subband may be different for different transmitting units.

For the case where the order of the cyclic shift sequences on different subbands is different, as shown in FIG. 12 for a cell, the order of CS Field indications on each block may be different. And it changes with time. As shown in slot 0, for subband 0, the order of indication of the CS indicator is 0, 1, 2, 3, 4, 5, 6, 7. If the base station informs the user through the DCI signaling that the value of the CSI Field is indicator#1(001), as shown in Table 4-1 below, then

The value of the cyclic shift index corresponding to the value is 1, 5, 3, 7.

Table 4-1

As shown in slot 0, for subband 1, the indication order of the CS indicator is 1, 2, 3, 4, 5, 6, 7, 0. If the base station informs the user through the DCI signaling that the value of the CSI Field is indicator#1(001), as shown in Table 4-2 or 4-3, then

The cyclic shift index corresponding to the value is 0, 4, 2, 6 or 2, 6, 4, 0.

Table 4-2

Table 4-3

That is to say, since the order of the different sub-band cyclic shift sequences is different, one CSI field indication value notified in the DCI is different for different sub-band meanings, and the values of the time cyclic shifts represented are different. The same is true for different subframes or time slots. The first communication node is configured to indicate to the second communication node, the second communication node, the signaling of the cyclic shift sequence used by the demodulation reference signal on a subband of a transmitting unit, and may also be used to indicate The cyclic shift sequence used by the demodulation reference signal on different subbands on the same transmitting unit, and/or in the same subband of different transmitting units, and/or on different subbands of different transmitting units, means that multiple subbands can be shared CSIfield indicates the value. In the DCI, only the indication value of a CSI field needs to be notified, and the user can derive the true CS value according to different sub-bands.

For a slot, the order of cyclic shift sequences on each block can be calculated according to the slot number and cell ID, and no signaling configuration is required. A baseline order can be configured for the entire bandwidth of all cells, such as

CS order#

0,1,2,...N-1 as the baseline order for

Block#

0,1...N-1. The order of the cyclic shift sequence may be CS_order (ns, cell_ID, block_ID) = mod (ns + cell_ID + baseline order of block_ID, N). For the same sub-frame, the order of cyclic shifts on adjacent bandwidths is offset by one bit, as shown in FIG.

Of course, as with the root sequence above, a spec_ID can be substituted for the cell ID. This spec_ID can be the same as the spec_ID mentioned in the above root sequence. That is, the base station only needs to notify a spec_ID.

The signaling described in the embodiment of the present disclosure refers to these spec_ID or cell ID, slot number, subframe number, and the like. In one subframe or time slot, all subbands can derive the cyclic shift sequence order on each subband based on the same spec_ID.

The first communication node is configured to indicate to the second communication node that the demodulation reference signal is in a sending unit

Signaling of the pattern number used on one of the subbands may also be used to indicate different subbands of the demodulation reference signal on the same transmitting unit and/or different subbands of different transmitting units and/or different subbands of different transmitting units The number of the pattern used on it.

Among them, the pattern numbers on different sub-bands can be different.

Among them, different transmission units, the pattern numbers on the same sub-band can be different.

That is, the DMRS pattern between different blocks can be different. As shown in Figure 13. The base station can be configured with multiple DMRS patterns, and the patterns on each sub-band can be different or can change with time. The pattern on each subband can be related to the spec_ID or cell ID, slot number or subframe number.

A multi-segment cascading scheme requires the entire bandwidth to be allocated into multiple blocks.

This scheme has scheduling restrictions for the packet service because the minimum scheduling unit is limited to one block. The system of the present disclosure can support multiple sub-band partitioning. For example, support two divisions: (1) one Block=4PRBs; (2) one block=1PRBs. Different users can configure the block length by RRC configuration or DCI or according to an implicit method, such as scheduling allocation mode. If the scheduling mode of the user determines that the resources allocated by the user are discrete, or the number of PRBs is relatively small, then the default is division mode 2, otherwise it is division mode 1.

Example 6

The first communication node indicates a pattern used to demodulate the reference signal by indicating one or more of the following signaling, density and/or sequence: signaling indicating a modulation and coding mode, signaling indicating a transmission mode, and retransmission indication Signaling, receiving mode. The pattern includes at least the number of time domain symbols or whether it is transmitted simultaneously with the data.

In general, high-order modulation data transmission requires higher channel estimation, so it may be necessary to demodulate the reference signal to have a higher density, and for low-order modulation data transmission, the channel estimation requirement is lower, so the density of the demodulated reference signal is demodulated. Can be lower. Therefore, for a plurality of DMRS patterns configured by the user, the indication of the MCS may be divided into multiple sets, and the Patterns of the DMRS are also divided into multiple sets, and each MCS set corresponds to one DMRS pattern set. For example, if 5 bits signaling is used to indicate that the MCS value is from 0 to 31, MCS 0-15 corresponds to one DMRS pattern set, and MCS16-31 corresponds to another DMRS pattern set. As shown in FIG. 13, multiple patterns of the DMRS may be divided into two sets, the first and the second are a set, and the third and fourth are a set, if the value of the MCS is reported to be lower than one. The threshold value, the pattern of the DMRS is the

patterns

1 and 2, otherwise the

patterns

3 and 4.

As shown in FIG. 21, if the MCS value obtained by the user from the dynamic DCI information is greater than the threshold value of the high-level signaling configuration, the DMRS pattern can be considered as shown in the right figure, and the blank resource unit (REs, Resource) at this time. Elements) are used to transfer data, ie DMRS and data FDM. If the MCS value obtained by the user from the dynamic DCI information is smaller than the threshold of the high-level signaling configuration, the DMRS pattern can be considered as shown in the left figure, and the density of the DMRS is high, and is not frequency-multiplexed with the data. This method is especially suitable for the case where the number of DMRS ports is large, such as the port of DMRS. The number is greater than or equal to 4, as shown in FIG.

Similarly, if the MCS is low, the DMRS needs to occupy two symbols for better channel estimation, and when the MCS is higher, only one time domain symbol is needed to transmit the DMRS, and the remaining resources can be used. transfer data. As shown in Figure 22. The base station can use the dynamic signaling of the MCS and the threshold of the high-level configuration to implicitly notify the DMRS whether to occupy one OFDM symbol or two OFDM symbols.

In summary, the base station notifies the user of the dynamic MCS information and the high-level configuration threshold value can also be used to notify the DMRS time domain symbol number or to inform the DMRS whether to frequency-multiplex the data with the data.

The different DMRS ports may correspond to different MCSs, and different DMRS ports may correspond to different MCS values. For example, if the MCS value corresponding to

port

1, 2 is lower than the MCS threshold of the upper layer configuration,

port

1, 2 needs higher density, that is, it does not reuse data or requires 2 time domain symbols to transmit DMRS, and the port The MCS value corresponding to 3, 4 is higher than the threshold of the high-level configuration. At this time,

ports

3 and 4 need lower density, that is, frequency division multiplexing with data or only one time domain symbol transmission DMRS. In other words, different modulation schemes and/or coding schemes correspond to the density of different ports of the data demodulation reference signal. As shown in Figure 23.

It should be noted that the threshold of the MCS in the present disclosure may be configured at a high level or may be a predefined value without signaling. In addition, the thresholds of the dynamic MCS and the MCS can be jointly notified to the modulation and coding mode as in the LTE, and the modulation mode and the coding mode can be separately notified. At this time, the threshold of the MCS can be set only for the modulation mode, for example, 16QAM, and Regardless of coding efficiency. Of course, the threshold of the MCS can also be set only for the code rate regardless of the modulation mode.

Since the number of symbols occupied by the DMRS and whether the data frequency domain multiplexing is related to the DMR pattern, it can also be said that the base station uses the joint signaling to indicate the modulation mode and/or the coding mode configuration information and the data demodulation reference signal pattern. The modulation mode and/or coding mode configuration information includes a At least one of: a dynamic data modulation mode and/or coding mode, a modulation mode and/or a coding mode threshold. The pattern includes the number of time domain symbols of the demodulation reference signal and/or whether the demodulation reference signal is transmitted simultaneously with the data.

For the signaling of the transmission mode, the base station is generally used to tell the user whether it is transmission diversity, closed-loop spatial multiplexing, or open-loop spatial multiplexing, etc., so the signaling, the density, and the like of the DMRS can be inferred by using the signaling. Similarly, the pattern of the DMRS can be divided into multiple sets, and different demodulation reference signals correspond to different sets of DMRS patterns.

In addition, if the scheduled data is retransmitted data, the density of the DMRS can be different. It is also possible to divide the pattern of the DMRS into multiple sets, and the retransmission or the first transmission corresponds to a different set of DMRS patterns. Different retransmission times may correspond to different DMRS pattern sets. For example, the DMRS pattern of the first retransmission and the second retransmission is different. Therefore, the UE can obtain some information of the DMRS pattern according to whether it is retransmitted or the number of retransmissions.

It is worth noting that a DMRS set can contain only one DMRS pattern.

For the indication signaling of the receiving mode, the user may determine the DMRS pattern set or the pattern or the DMRS sequence according to different receiving mode indication signaling. For example, if the base station indicates that the user needs to perform beam scanning when receiving differently, the pattern of the DMRS may be as shown in FIG. 14, that is, the analog beams of the multi-row DMRS are the same, and the user may use different receiving beams to detect the multi-row DMRS, and then Pick a list of the best DMRS for demodulation. At this point, the DMRS of different columns may be simply repeated, with no sequence changes.

If the base station indicates that the user does not need to perform receive beam scanning, the DMRS pattern may not use multiple columns of DMRSs to correspond to multiple analog beams. If there are multiple columns of DMRS at this time, the corresponding sequence can be different.

Example 7

The first communication node indicates different demodulation reference signals of the second communication node by signaling The density and/or orthogonal code length of the corresponding demodulation reference signal may be different.

The different demodulation reference signal groups correspond to one or more modes: different resource groups, different demodulation reference signal ports, different transmission code words, and different transmission layers.

In LTE, one scheduling can transmit up to two codewords, and each codeword can contain multiple layers. Each codeword has a signaling indication HARQ process, indicating MCS, and the like. Each layer may correspond to a different DMRS port.

In future research in 5G, since different DMRS ports may come from different base stations or cells, and whether multiple users are scheduled under different cells or base stations, how many users are scheduled to perform multi-user MIMO may be independent. Therefore, if the density of different DMRS ports or port sets can be different, maximum flexibility can be achieved. As shown in Figure 15, port 1 and port 2 are denser than port 3 and port 4. If a user is scheduled for 2 codewords, codeword 1 corresponds to

layers

1 and 2, and

ports

1 and 2 correspond to

layers

1 and 2, respectively, correspondingly, if codeword 2 corresponds to

ports

3 and 4, then codeword 1 corresponds to The density of the DMRS is higher than the DMRS density corresponding to the code word 2. That is to say, the density of different DMRS ports, or codewords, or DMRSs corresponding to layers in the present disclosure may be different. Of course, it can be seen that the DMRS density corresponding to different DMRS resource groups is different. For example, as shown in FIG. 15, the density of the DMRS time-frequency resource group corresponding to the above box is higher than the DMRS time-frequency resource in the lower frame. The corresponding DMRS density of the group. The DMRS time-frequency resource group in the above box consists of 4 REs, while the bottom consists of only 2 REs.

Since different ports may come from different cells, the length of the orthogonal codes may also be different in order to multiplex with different numbers of users in different cells. As shown in FIG. 15, since the number of time domain DMRS symbols corresponding to

ports

1 and 2 is 2, the orthogonal code length in the time domain can be 2, so that 2 ports or 2 can be multiplexed by time domain orthogonality. user. For

ports

3 and 4, since there is only one DMRS symbol in the time domain and the orthogonal code length in the time domain is 1, the orthogonal codes can be used to distinguish between

ports

3 and 4 by frequency domain orthogonality or frequency domain. It is.

The first communication node notifies, by means of dynamic signaling, implicitly or clearly or a combination of both, which parameter or pattern of the demodulation reference signal used by the second communication node is the higher layer signaling. The implicit notification is that the base station uses other purposes of signaling to indicate DMRS pattern information, such as MCS, A/N feedback delay, etc. as mentioned in the prior art. The clear notification means that the base station needs a clear bit to indicate the DMRS information. Or a combination of the two.

Generally, in order to adapt to different application scenarios, the demodulation reference signal can have a variety of patterns, density, sequence, orthogonal code length, etc., corresponding to different demodulation reference signal parameters. Such a system can predefine a large DMRS pattern or set of parameters, and this DMRS set can contain all patterns, sequences, orthogonal code lengths, and the like. Since different user channel conditions are different, the base station can semi-statically select a DMRS subset from the set through high-level signaling, and the subset includes some DMRS patterns suitable for the user, and/or density, time-frequency domain. Location, and/or sequence, and/or orthogonal code length, and the like. In actual scheduling, the base station needs to dynamically inform the user which DMRS parameter or pattern used in a certain scheduling unit is a subset of the higher layer signaling configuration.

For example, the predefined DMRS pattern contains 8 patterns, as shown in Figure 16. The base station can use the high layer signaling to select 4 out of the 8 patterns, such as

pattern

1, 2, 3, 4. Then in the scheduling, the base station can reuse the dynamic signaling to inform the user which pattern, for example, in the DCI. 2bits to indicate which of the subsets of the higher layer signaling configuration is the Pattern. Of course, according to the technology included in the present disclosure, the base station may implicitly notify the user of some DMRS configuration information by using other parameters, such as dividing the DMRS pattern subset of the high layer signaling configuration into two small subsets, such as

pattern

1, 2 is a kid. Set 1, pattern3, 4 is a small subset of 2. Implied indication by the base station through MCS signaling Is it a small subset 1 or a small subset 2. In this way, the base station only needs an extra 1 bit in the DCI to indicate which DMRS pattern is in the small subset.

Example 8

The preset signaling is used to indicate the pattern of the demodulation reference signal, and is also used to indicate the slot structure. The pattern of the demodulation reference signal includes at least one of the following:

The time domain position of the demodulation reference signal subset, the number of time domain symbols, the maximum number of orthogonal ports that can be supported, and the number of subsets included in the demodulation reference signal.

It can also be said that the base station uses the joint signaling to indicate the slot structure and the data demodulates the pattern of the reference signal. The data solution

The pattern of the reference signal includes the number of time domain symbols and/or the number of demodulation reference signal ports that can support the maximum. Or the pattern of the data demodulation reference signal includes a time domain spacing of a plurality of subsets of the demodulation reference signal, a number of subsets, and a time domain position of the subset.

The NR may support two or more slot structures, for example, support two slot structures, the first is a slot structure containing seven time domain symbols, and the second is a slot structure containing 14 time domain symbols. At the same time, the NR needs to support the self-contained slot structure, that is, in the same slot, the base station schedules downlink data transmission in the slot through dynamic control signaling (such as PDCCH), and the user detects the PDSCH in the same slot. And report whether the reception is correct or not, that is, scheduling, data transmission, ACK/NACK feedback is completed in the same slot. This requires a high degree of user demodulation speed. At this point, the DMRS needs to be placed in the front part of the PDSCH area in the slot. We call this top DMRS bit loaded DMRS. For the self-contained slot structure, the last one or two time domain symbols are generally used to transmit ACK/NACK, and a guard interval of at least one symbol is required between the downlink data and the ACK/NACK.

As shown in Fig. 24a, the 7-symbol slot structure assumes that symbol #7 is used for user feedback ACK/NACK, and symbol #6 is used for guard interval, that is, no data is transmitted for uplink and downlink cuts. change. The symbols #1, #2 are used by the base station to transmit the PDCCH. At this time, only the

symbols

3, 4, and 5 can be used to transmit data and DMRS. If the DMRS occupies 2 time domain symbols, then there are very few resources available for the data. Therefore, when the time slot is 7 symbols, it is necessary to limit the front loaded DMRS to one symbol. At this time, the base station can implicitly notify the number of symbols of the DMRS by using signaling of the notification slot structure. That is, the base station can use the combined information to indicate the slot structure and the number of DMRS symbols. This indication is especially useful when the DMRS is front loaded. If the front loaded DMRS is not required, or when the ACK/NACK is not required to be transmitted in the same subframe as the PDSCH, the joint indication information may not be referred to.

As shown in Figures 24b and 24c, if the slot structure is 14 symbols, the number of symbols of the front loaded DMRS may be one or two. Therefore, the base station can use the information of the slot structure to indicate whether the number of symbols used by the DMRS for fast demodulation is one or two. For example, the base station uses the 1-bit DCI information to indicate the user slot structure, where 0 represents 7 symbols and 1 represents 14 symbols. If the DMRS is front loaded DMRS, that is, fast demodulation and feedback are required, the DMRS only occupies one time domain symbol. 1 also indicates that the DMRS can occupy 1 or 2 time domain symbols.

Since the maximum number of DMRS ports that can be supported by one DMRS time domain symbol is smaller than the maximum number of DMRS ports that can be supported by two DMRS time domain symbols, it can also be said that the base station uses the joint information to indicate that the reference signal pattern can support the maximum. Demodulate the number of reference signal ports.

In order to obtain better channel estimation characteristics, DMRS can be divided into multiple subsets, such as two. The time domain spacing of the two sets of DMRSs can also be communicated to the time slot mechanism through the combined information. In general, each DMRS subset contains the same DMRS pattern. For example, in the case of only two DMRS subsets, in a time slot containing only seven time domain symbols, the time domain spacing of two DMRS subsets is D_A, and in a time slot containing 14 time domain symbols, The time domain spacing of the two DMRS subsets is D_B, then D_A is less than D_B. Since the 7symbol time slot is shorter and the 14symbol time slot is longer, the shorter time slot corresponding DMRS subset spacing is smaller than the longer time slot corresponding DMRS subset spacing.

After the number of subsets of the DMRS is determined, the locations of the DMRS subsets may be configured for pre-defined or higher layer signaling for different slot structures, so that the base station can use the joint information to inform the slot structure and the location of the DMRS subset. .

As shown in FIG. 25, if the number of DMRS subsets is 2, the base station can utilize joint signaling 1 bit, 0 represents a slot structure of 7 symbols, and the positions of two DMRSs are

symbols

3, 5; and 1 represents 14 The slot structure of symbol and the positions of the two DMRS subsets are 3, 10 respectively. At the same time, it can be seen that the positional spacing of the two subsets of DMRS in the seven symbol slots is 2, and the positional spacing of the two DMRS subsets in the 14 symbol slots is 7, which is relatively large.

A DMRS subset can be viewed as a DMRS transmitted on one or two consecutive OFDM symbols, or can be a period of DMRS transmission. As shown in the left figure of Figure 25, the first subset of DMRS is mapped to the third symbol, the second subset is mapped to the fifth symbol, and in the third and fifth symbols, all ports of the DMRS are completely transmitted. It is. That is to say, the subset of the plurality of DMRSs has the same resource location in the frequency domain mapping, and all of the same ports are mapped, but differ in time. It can be seen that the DMRS pattern on symbol 5 is a repetition of symbol 3, but is mapped on different time domain symbols. It is worth noting that the method described herein can be applied to multiple DMRS subsets. Of course, the patterns of the first subset and the second subset are not excluded, and the number of ports or the density is different. In addition, the disclosure herein is not limited to the case of two subsets, and can be applied to a plurality of subsets. It can be easily seen that the slot structure of the seven time domain symbols supports fewer DMRS subsets than the number of DMRS subsets supported by the 14 symbol slot structures. In the case of high Doppler shift, 14 symbol slot structures often require more DMRS in the time domain, which means more DMRS subsets are needed.

Different DMRS time domain symbols, DMRS subset position, spacing, port number, port number, etc. all belong to the DMRS pattern, so in general, the base station can use the joint indication information to notify the user of the slot structure and data. Demodulate the pattern of the reference signal. Therefore, the disclosure also includes that the base station can use the joint indication information to notify the user of the slot structure and the data demodulation reference signal. The sequence number of the port and/or the sequence of reference signals (including scrambling sequences, OCC orthogonal sequences, etc.).

Example 9

The preset signaling is used to indicate the multiplexing mode of the plurality of ports of the demodulation reference signal on the time domain symbol and/or the mode of demodulating the reference signal, and is also used to indicate whether the phase noise reference signal exists.

It can also be said that the base station uses the joint signaling to indicate the phase noise tracking signal (PTRS: phase noise tracking RS).

Whether there is a multiplexing mode of multiple ports of the demodulation reference signal on the time domain symbol, wherein the multiplexing mode of the plurality of ports of the demodulation reference signal in the time domain is divided into code division multiplexing and time division multiplexing. The configuration information of the reference signal of the phase noise includes whether a high-level configuration phase noise reference signal exists and/or a dynamic data modulation coding mode size.

For example, the configuration information of the phase noise reference signal includes high layer signaling, and the base station uses the high layer RRC signaling to semi-statically indicate whether the user PTRS can exist. If the PTRS exists semi-statically, the frequency band of the transmitted data is proved to be high, and the phase noise is (phase noise) is likely to exist, in which case phase noise causes phase changes on different time domain OFDM symbols. That is to say, if the phase noise is relatively serious, the channel difference on adjacent OFDM symbols is relatively large. In general, when multiple DMRS ports are code-multiplexed on multiple time-domain symbols, the best case is that the channels on multiple time-domain symbols are the same or close, otherwise the effect of code division multiplexing (CDM) will be poor. As a result, the performance of the channel estimation is degraded. In summary, the presence of phase noise affects the performance of multiple DMRS ports in the time domain for CDM, and whether phase noise can exist can be judged according to RRC signaling. Therefore, the base station uses the same signaling to indicate whether the PTRS can exist or not, and indicates whether multiple ports of the DMRS are CDM in the time domain symbol. If the CDM is not available, multiple ports are preferably time division multiplexed (TDM) in the time domain.

This joint information is only applicable to the case where the DMRS has multiple time domain symbols, and is particularly suitable for including at least two columns of adjacent DMRS OFDM symbols.

As shown in FIG. 26, in the case of CDM, DMRS ports p#1, p#3 are code division multiplexed on two adjacent OFDM symbols, and ports p#1 and p#3 occupy the same REs at this time. For example, in the two REs adjacent in the time domain, the OCC code used by p#1 is [1 1], and the OCC code used by p#3 is [1 -1]. For a DMRS port of a user, if the channels on two adjacent OFDM symbols are the same or close, the CDM can bring a code division gain, thereby increasing the accuracy of channel estimation to improve transmission efficiency. However, in the high frequency band, the phase noise often causes the phase deviation of the channel between different OFDM symbols, so that the channel estimation accuracy of the CDM method is lowered, and TDM is a good choice at this time. As shown in the figure, in TDM, ports p#1, p#3 are time division multiplexed on two adjacent OFDM symbols, and p#1 and p#3 occupy different REs. In the figure, port p#1 is mapped on the first OFDM symbol where the DMRS is located, and p#3 is mapped on the second OFDM symbol. Ports p#2, p#4 and p#1, p#3 are similar in the figure. Therefore, whether different ports are CDM or TDM on different OFDM symbols can be judged according to whether there is phase noise, TDM is used for phase noise, and CDM is used when there is no phase noise. The presence or absence of phase noise can be judged based on whether PTRS can exist. In this way, the base station can use the combined information to indicate whether the PTRS can exist, and whether the different ports are CDM or TDM on different OFDM symbols can be judged according to whether there is phase noise. For example, the base station indicates with 1 bit RRC signaling, 0 indicates that PTRS cannot exist and different DMRS ports are CDM on different time domain symbols, and 1 indicates that PTRS can exist and different DMRS ports are TDM on different time domain symbols. In other words, the base station notifies the PTRS whether there is high-level signaling and whether the signaling that the DMRS multi-port is CDM or TDM is the same signaling.

It is worth noting that the presence of PT signaling to configure PTRS does not necessarily mean that a user's PTRS must exist. If the RRC is configured to be PTRS, the UE can determine whether the PTRS is actually sent according to the dynamically configured MCS. For example, if the MCS is greater than a threshold, the PTRS is Send, otherwise not sent. This threshold is also configured for RRC signaling. If the RRC configuration PTRS does not exist, then the PTRS will not be sent, no matter how many MCS. Therefore, whether the DMRS multiple ports are CDM or TDM can also be determined according to the RRC signaling, MCS, and threshold values of the configured PTRS. For example, the actual RRC is configured with PTRS. When the MCS is greater than the threshold, the DMRS multi-port is TDM, otherwise it is CDM. In other words, the base station indicates the DMRS multi-port multiplexing mode, the PTRS-related RRC signaling, the MCS indication, and the threshold value through the joint information.

In addition, the DMRS pattern involved in this example does not discuss the mapping manner of the DMRS port in the frequency domain, so the manner in which the DMRS port is multiplexed in the frequency domain does not affect the present disclosure. As shown in FIG. 1 , p#1, p#2 may be frequency division multiplexing (FDM) on two adjacent REs in the frequency domain, and p#1, p#2 are in the frequency domain. Different REs are occupied; it can also be Code Division Multiplexing (CDM).

The preset signaling is used to indicate whether the phase noise reference signal exists when the pattern of the reference signal is demodulated. The number of orthogonal ports that different demodulation reference signals can support is different. For example, for demodulation reference signal pattern A, up to 12 orthogonal ports can be supported, and demodulation reference signal pattern B can only support a maximum of 8 orthogonal ports. In the high frequency band, the coverage of the cell is limited, and the number of base stations TxRU is also limited. At this time, it is not necessary to support the pattern A. The high-level RRC signaling configuration PTRS means that it is transmitted in the high frequency band, and it is implied that there is no need to support the pattern A. That is, the base station can use PTRS related signaling to indicate which demodulation reference signals are not supported.

FIG. 19 is a first schematic structural diagram of an apparatus for configuring a demodulation reference signal according to an embodiment of the present disclosure. As shown in FIG. 19, the apparatus includes:

The indicating unit 1901 is configured to indicate, by using preset signaling, a parameter used by the second communication node to demodulate the reference signal, where the parameter used for demodulating the reference signal includes at least one of: demodulating a sequence of reference signals Type, time domain location, pattern, density, orthogonal code length, root sequence, cyclic shift sequence, number of ports, number of time domain symbols, whether or not to transmit simultaneously with data Instructions.

In the embodiment of the present disclosure, the indication unit 1901 is further configured to: indicate, by the signaling indicating the positive/negative acknowledgement ACK/NACK feedback delay, the parameter used by the second communication node to demodulate the reference signal.

In the embodiment of the present disclosure, the indicating unit 1901 is further configured to: indicate, by indicating at least one of the following signaling, an orthogonal code length used for demodulating the reference signal:

In the embodiment of the present disclosure, the indicating unit 1901 indicates, by indicating at least one of the following signaling, a pattern and/or a density and/or a sequence and/or a number of time domain symbols used for demodulating the reference signal and/or whether Data is transmitted simultaneously:

In the embodiment of the present disclosure, the indicating unit 1901 indicates that the density and/or the orthogonal code length of the demodulation reference signal corresponding to the different demodulation reference signal groups of the second communication node are different by signaling;

In the embodiment of the present disclosure, the indication unit 1901 configures, by the high layer signaling, a plurality of demodulation reference signal parameters to the second communication node; or, by using the high layer signaling, the configuration is configured from the predefined multiple demodulation reference signal patterns. A part of the two communication nodes, and the indication unit 1901 notifies which of the higher layer signaling the parameter or pattern of the demodulation reference signal used by the second communication node is dynamically signaled.

In the embodiment of the present disclosure, the preset signaling is used to indicate that the demodulation reference signal is in a cyclic shift sequence used on one subband of a transmitting unit, and is also used to indicate that the demodulation reference signal is Different sub-bands on the same transmitting unit, and/or different sub-bands of different transmitting units, and/or cyclic shift sequences used on different sub-bands of different transmitting units;

In the embodiment of the present disclosure, the indicating unit 1901 indicates, by using the signaling, that the bandwidth used by the second communications node for demodulating the reference signal to support multiple partitioning methods according to different lengths of the subbands.

The above-described apparatus for configuring a demodulation reference signal of an embodiment of the present disclosure is located at a first communication node, such as a base station.

It will be understood by those skilled in the art that the implementation function of each unit in the apparatus for configuring the demodulation reference signal shown in FIG. 19 can be understood by referring to the related description of the foregoing method of configuring the demodulation reference signal. The function of each unit in the apparatus for demodulating the reference signal shown in FIG. 19 can be realized by a program running on the processor, or can be realized by a specific logic circuit.

FIG. 20 is a second structural diagram of an apparatus for configuring a demodulation reference signal according to an embodiment of the present disclosure. As shown in FIG. 20, the apparatus includes:

The determining unit 2001 is configured to determine a parameter used for demodulating the reference signal by receiving preset signaling sent by the first communications node, where the parameter used for demodulating the reference signal includes at least one of the following: a demodulation reference The type of the sequence of the signal, the time domain position, the pattern, the density, the orthogonal code length, the root sequence, the cyclic shift sequence, the number of ports, the number of time domain symbols, and whether or not the information is transmitted simultaneously with the data.

In the embodiment of the present disclosure, the determining unit 2001 determines the parameter of the demodulation reference signal by signaling from the first communication node for indicating a positive/negative acknowledgment ACK/NACK feedback delay.

In the embodiment of the present disclosure, the determining unit 2001 determines the kind of the sequence used by the demodulation reference signal by signaling from the first communication node for indicating the demodulation reference signal pattern.

In the embodiment of the present disclosure, the determining unit 2001 determines whether the demodulation reference signal is continuously or discontinuously transmitted in the frequency domain by signaling from the first communication node for indicating the number of demodulation reference signal ports.

In an embodiment of the present disclosure, the determining unit 2001 determines an orthogonal code length used by the demodulation reference signal by signaling from the first communication node for indicating a demodulation reference signal pattern and/or density; or The demodulation reference signal pattern and/or density is determined by signaling from the first communication node indicating the orthogonal code length used by the demodulation reference signal. .

In the embodiment of the present disclosure, the determining unit 2001 determines the orthogonal code length used for demodulating the reference signal by using at least one following signaling from the first communication node:

In an embodiment of the present disclosure, the determining unit 2001 determines the density and/or pattern of the demodulation reference signal by signaling from the first communication node for indicating scheduling resources.

In an embodiment of the present disclosure, the determining unit 2001 determines the density and/or the number of patterns and/or time domain symbols of the demodulation reference signal and/or whether by the at least one signaling from the first communication node. Simultaneous transmission with data:

In the embodiment of the present disclosure, the determining unit 2001 receives the signaling of the first communications node, indicating that the density and/or the orthogonal code length of the demodulation reference signal corresponding to different demodulation reference signal groups are different;

In the embodiment of the present disclosure, the determining unit 2001 receives a plurality of demodulation reference signal parameters configured by the first communication node by using high layer signaling, or from a plurality of predefined demodulation reference signal patterns by using high layer signaling. A portion of the pattern is configured for the second communication node, and the determining unit 2001 knows which of the higher layer signaling the parameter or pattern of the demodulation reference signal is by dynamic signaling from the first communication node.

In the embodiment of the present disclosure, the determining unit 2001 determines that the demodulation reference signal is in the signaling by the root sequence used by the first communication node to indicate that the demodulation reference signal is on one subband of one of the receiving units. Different sub-bands on the same receiving unit, and/or different sub-bands of different receiving units, and/or root sequences used on different sub-bands of different receiving units;

In the embodiment of the present disclosure, the determining unit 2001 determines the demodulation reference by signaling from the first communication node for indicating a cyclic shift sequence used by the demodulation reference signal on one subband of one receiving unit. a cyclic shift sequence used on different subbands of the same receiving unit, and/or the same subband of different receiving units, and/or different subbands of different receiving units;

In the embodiment of the present disclosure, the determining unit 2001 determines that the demodulation reference signal is in the signaling by using the pattern sequence number used by the first communication node to indicate that the demodulation reference signal is used on one subband of one receiving unit. Different sub-bands on the same receiving unit, and/or different sub-bands of different receiving units, and/or pattern numbers used on different sub-bands of different receiving units;

In the embodiment of the present disclosure, the determining unit 2001 determines the used subband dividing method according to the indication signaling from the first communication node.

The above-described apparatus for configuring a demodulation reference signal of an embodiment of the present disclosure is located at a second communication node, such as a terminal.

It will be understood by those skilled in the art that the implementation function of each unit in the apparatus for demodulating the reference signal shown in FIG. 20 can be understood by referring to the related description of the foregoing method of configuring the demodulation reference signal. The functions of the units in the apparatus for demodulating the reference signal shown in FIG. 20 can be realized by a program running on the processor, or can be realized by a specific logic circuit.

In practical applications, the functions implemented by each unit in the device may be processed by a central processing unit (CPU), or a microprocessor (MPU, digital processor unit) located in the device, or digital signal processing. (DSP, Digital Signal Processor), or Field Programmable Gate Array (FPGA) implementation.

Embodiments of the Present Disclosure The above apparatus, if implemented in the form of a software function module and sold or used as a standalone product, may also be stored in a computer readable storage medium. Based on such understanding, the technical solution of the embodiments of the present disclosure may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium, including a plurality of instructions. A computer device (which may be a personal computer, server, or network device, etc.) is caused to perform all or part of the methods described in various embodiments of the present disclosure. The foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read only memory (ROM), a magnetic disk, or an optical disk. Thus, embodiments of the present disclosure are not limited to any specific combination of hardware and software.

Accordingly, embodiments of the present disclosure also provide a computer storage medium having stored therein a computer program configured to perform the configuration of the demodulation reference signal of an embodiment of the present disclosure. law.

Those skilled in the art will appreciate that embodiments of the present disclosure can be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware aspects. Moreover, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present disclosure. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

The above description is only for the preferred embodiments of the present disclosure, and is not intended to limit the scope of the disclosure.

Industrial applicability

In the technical solution of the embodiment of the present disclosure, the first communication node indicates, by using preset signaling, the second communication node, the parameter used for demodulating the reference signal, where the parameter used for demodulating the reference signal includes at least one of the following: The type of the reference signal sequence, the time domain position, the pattern, the density, the orthogonal code length, the root sequence, the cyclic shift sequence, the number of ports, the number of time domain symbols, and whether or not the information is transmitted simultaneously with the data. With the technical solution of the embodiment of the present disclosure, the configuration parameter indicating the demodulation reference signal implied by other signaling is implemented, which saves signaling overhead. In addition, for the multi-segment cascading method, the root sequence on different sub-bands, the loop thinks that the pattern change can bring interference randomization.

Claims

A method of configuring a demodulation reference signal, the method comprising:

The first communication node indicates to the second communication node, by using preset signaling, a parameter used for demodulating the reference signal; wherein the parameter used for demodulating the reference signal includes at least one of: a type of sequence of the demodulation reference signal, Time domain location, pattern, density, orthogonal code length, root sequence, cyclic shift sequence, number of ports, number of time domain symbols, indication information whether or not to transmit simultaneously with data.
The method of configuring a demodulation reference signal according to claim 1, wherein said first communication node indicates to said second communication node a parameter used for demodulating the reference signal by signaling indicating a positive/negative acknowledgment feedback delay.
The method of configuring a demodulation reference signal according to claim 1, wherein the preset signaling is used to indicate a type of a sequence used for demodulating a reference signal when demodulating a reference signal pattern.
The method for configuring a demodulation reference signal according to claim 1, wherein the preset signaling is used to indicate the number of demodulation reference signal ports, and is also used to indicate that the demodulation reference signal is transmitted in the frequency domain. Whether it is continuous or non-continuous.
The method for configuring a demodulation reference signal according to claim 1, wherein the preset signaling is used to indicate the orthogonality used for demodulating the reference signal when the demodulation reference signal pattern or density is used. Code length.
The method of configuring a demodulation reference signal according to claim 1, wherein said first communication node indicates an orthogonal code length used for demodulating a reference signal by indicating at least one of:

Signaling indicating the length of the time domain scheduling symbol, signaling indicating the maximum length of the orthogonal code, signaling indicating the parameter of the demodulation reference signal.
The method of configuring a demodulation reference signal according to claim 1, wherein the preset The signaling is used to indicate the density and/or pattern of the demodulated reference signal and is also used to indicate scheduling resources.
The method for configuring a demodulation reference signal according to claim 1, wherein the preset signaling is used to indicate a pattern of demodulating a reference signal, and is further used to indicate a slot structure, wherein the demodulation reference The pattern of the signal includes at least one of the following:

The time domain position of the demodulation reference signal subset, the number of time domain symbols, the number of orthogonal ports that can support the maximum, and the number of subsets included in the demodulation reference signal.
A method of configuring a demodulation reference signal according to claim 1 wherein said first communication node indicates a pattern and/or density and/or sequence used to demodulate the reference signal by indicating at least one of the following signals. Or the number of time domain symbols and/or whether they are transmitted simultaneously with the data:

Signaling indicating modulation and coding mode, signaling indicating transmission mode, retransmission indication signaling, and receiving mode;

The pattern of the demodulation reference signal includes at least one of the following:

The number of time domain symbols, whether or not the information is transmitted simultaneously with the data.
The method for configuring a demodulation reference signal according to claim 1, wherein the preset signaling is used to indicate a multiplexing mode and/or a demodulation reference of a plurality of ports of the demodulation reference signal on a time domain symbol. The pattern of the signal is also used to indicate whether the phase noise reference signal is present;

The multiplexing mode refers to time division multiplexing or code division multiplexing.
The method of configuring a demodulation reference signal according to claim 1, wherein said first communication node indicates, by signaling, a density and/or a demodulation reference signal corresponding to a different demodulation reference signal group of the second communication node The orthogonal code lengths are different;

The different demodulation reference signal groups correspond to at least one of the following: different resource groups, different demodulation reference signal ports, different transmission codewords, and different transmission layers.
The method for configuring a demodulation reference signal according to claim 1, wherein the first communication node configures a plurality of demodulation reference signal parameters to the second communication node by higher layer signaling; or Multiple demodulation reference signal patterns are configured for the second communication section A part of the pattern is clicked, and the first communication node notifies, by dynamic signaling, which parameter or pattern of the demodulation reference signal used by the second communication node is the higher layer signaling.
The method of configuring a demodulation reference signal according to claim 1, wherein the bandwidth of the demodulation reference signal transmission can be divided into a plurality of sub-bands, wherein each sub-band is a complete sequence.
The method of configuring a demodulation reference signal according to claim 13, wherein said predetermined signaling is used to indicate a root sequence used by a demodulation reference signal on a subband of a transmitting unit, Indicating a different subband of the demodulation reference signal on the same transmitting unit, and/or the same subband of different transmitting units, and/or a root sequence used on different subbands of different transmitting units;

Wherein, the root sequences on different sub-bands are different or the same; the root sequences on the same sub-band of different transmitting units are different or the same.
The method of configuring a demodulation reference signal according to claim 13, wherein said predetermined signaling is used to indicate a cyclic shift sequence used by a demodulation reference signal on a subband of a transmitting unit, a cyclic shift sequence used to indicate different subbands of the demodulation reference signal on the same transmitting unit, and/or the same subband of different transmitting units, and/or different subbands of different transmitting units;

Wherein, the order of the cyclic shift sequences on different sub-bands is different or the same; wherein, the order of the cyclic shift sequences on the same sub-band of different transmitting units is different or the same.
The method of configuring a demodulation reference signal according to claim 13, wherein said predetermined signaling is used to indicate a pattern number used by a demodulation reference signal on a subband of a transmitting unit, Indicating a different sub-band of the demodulation reference signal on the same transmitting unit, and/or the same sub-band of different transmitting units, and/or a pattern number used on different sub-bands of different transmitting units;

The sequence numbers of the different sub-bands are different or the same; wherein the code numbers on the same sub-bands of different transmission units are different or the same.
A method of configuring a demodulation reference signal according to claim 13, wherein said The first communication node uses the signaling to indicate that the bandwidth used by the second communication node to demodulate the reference signal transmission supports multiple partitioning methods according to different subband lengths.
A method of configuring a demodulation reference signal, the method comprising:

The second communication node determines a parameter used for demodulating the reference signal by receiving preset signaling sent by the first communication node; wherein the parameter used for demodulating the reference signal includes at least one of: demodulating the reference signal The type of the sequence, the time domain position, the pattern, the density, the orthogonal code length, the root sequence, the cyclic shift sequence, the number of ports, the number of time domain symbols, and whether or not the information is transmitted simultaneously with the data.
A method of configuring a demodulation reference signal according to claim 18, wherein said second communication node determines by means of signaling from the first communication node for indicating a positive/negative acknowledgment ACK/NACK feedback delay Describe the parameters of the demodulation reference signal.
The method of configuring a demodulation reference signal according to claim 18, wherein said second communication node determines said demodulation reference signal by signaling from said first communication node for indicating a demodulation reference signal pattern The type of sequence.
The method of configuring a demodulation reference signal according to claim 18, wherein said second communication node determines said demodulation reference by signaling from said first communication node for indicating a number of demodulation reference signal ports Whether the signal is transmitted continuously or discontinuously in the frequency domain.
The method of configuring a demodulation reference signal according to claim 18, wherein said second communication node determines said solution by signaling from said first communication node for indicating a demodulation reference signal pattern and/or density Adjust the orthogonal code length used by the reference signal; or,

The second communication node determines a demodulation reference signal pattern and/or density by signaling from the first communication node indicating the orthogonal code length used by the demodulation reference signal.
The method of configuring a demodulation reference signal according to claim 18, wherein said second communication node determines an orthogonal code length used for demodulating a reference signal by at least one of following indication signaling from a first communication node:

Signaling indicating the length of the time domain scheduling symbol, signaling indicating the maximum length of the orthogonal code, signaling indicating the parameter of the demodulation reference signal.
The method of configuring a demodulation reference signal according to claim 18, wherein said second communication node determines a density of said demodulation reference signal and/or by signaling from said first communication node for indicating a scheduling resource Or pattern.
The method of configuring a demodulation reference signal according to claim 18, wherein said second communication node determines density and/or pattern and sum of said demodulation reference signal by at least one of following signaling from a first communication node / or the number of time domain symbols and / or whether it is transmitted simultaneously with the data:

Signaling indicating modulation and coding mode, signaling indicating transmission mode, retransmission indication signaling, and receiving mode.
The method of configuring a demodulation reference signal according to claim 18, wherein said second communication node receives the signaling of the first communication node indicating a density of demodulation reference signals corresponding to different demodulation reference signal groups and / or orthogonal code length is different;

The different demodulation reference signal groups correspond to at least one of the following: different resource groups, different demodulation reference signal ports, different transmission codewords, and different transmission layers.
The method of configuring a demodulation reference signal according to claim 18, wherein said second communication node receives a plurality of demodulation reference signal parameters configured by said first communication node by higher layer signaling; or by higher layer signaling And configuring a part of the pattern of the second communication node from the predefined plurality of demodulation reference signal patterns, and the second communication node knows the parameter or pattern of the demodulation reference signal by dynamic signaling from the first communication node. Which is the higher layer signaling.
The method of configuring a demodulation reference signal according to claim 18, wherein the bandwidth of the demodulation reference signal transmission is divided into a plurality of sub-bands, wherein each sub-band is a complete sequence.
A method of configuring a demodulation reference signal according to claim 28, wherein said second communication node is configured to indicate a demodulation reference signal on a receipt by the first communication node Signaling of the root sequence used on a subband of the element to determine different subbands of the demodulation reference signal on the same receiving unit, and/or the same subband of different receiving units, and/or different subbands of different receiving units The root sequence used above;

Wherein, the root sequences on different sub-bands are different or the same; wherein the root sequences on the same sub-band of different receiving units are different or the same.
A method of configuring a demodulation reference signal according to claim 28, wherein said second communication node passes a loop from said first communication node for indicating a demodulation reference signal on a subband of a receiving unit Transmitting sequenced signaling to determine different subbands of the demodulation reference signal on the same receiving unit, and/or different subbands of different receiving units, and/or cyclic shift sequences used on different subbands of different receiving units;

Wherein, the order of the cyclic shift sequences on different sub-bands is different or the same; wherein the order of the cyclic shift sequences on the same sub-band of different receiving units is different or the same.
A method of configuring a demodulation reference signal according to claim 28, wherein said second communication node passes a pattern used by said first communication node to indicate that said demodulation reference signal is on a subband of a receiving unit Serial number signaling to determine different sub-bands of the demodulation reference signal on the same receiving unit, and/or different sub-bands of different receiving units, and/or pattern numbers used on different sub-bands of different receiving units;

The numbers of the patterns on the different sub-bands are different or the same; wherein the numbers of the patterns on the same sub-bands of different receiving units are different or the same.
The method of configuring a demodulation reference signal according to claim 28, wherein said second communication node determines the used subband division method based on the indication signaling from the first communication node.
An apparatus for configuring a demodulation reference signal is applied to a first communication node, the apparatus comprising:

The indicating unit is configured to indicate, by using preset signaling, the demodulation reference signal to the second communication node a parameter used; wherein the parameter used for demodulating the reference signal comprises at least one of: a type of a sequence of the demodulated reference signal, a time domain position, a pattern, a density, an orthogonal code length, a root sequence, and a cyclic shift sequence. The number of ports, the number of time domain symbols, and whether or not the information is sent simultaneously with the data.
The apparatus for configuring a demodulation reference signal according to claim 33, wherein the indication unit is further configured to: indicate, by the signaling indicating a positive/negative acknowledgment feedback delay, to the second communication node to use the demodulation reference signal parameter.
The apparatus for configuring a demodulation reference signal according to claim 33, wherein said predetermined signaling is used to indicate a type of a sequence used for demodulating a reference signal when demodulating a reference signal pattern.
The apparatus for configuring a demodulation reference signal according to claim 33, wherein the preset signaling is used to indicate the number of demodulation reference signal ports, and is also used to indicate that the demodulation reference signal is transmitted in the frequency domain. Whether it is continuous or non-continuous.
The apparatus for configuring a demodulation reference signal according to claim 33, wherein the predetermined signaling is used to indicate the orthogonality used for demodulating the reference signal when the demodulation reference signal pattern or density is used. Code length.
The apparatus for configuring a demodulation reference signal according to claim 33, wherein the indication unit is further configured to indicate an orthogonal code length used for demodulating the reference signal by indicating at least one of the following:

Signaling indicating the length of the time domain scheduling symbol, signaling indicating the maximum length of the orthogonal code, signaling indicating the parameter of the demodulation reference signal.
The apparatus for configuring a demodulation reference signal according to claim 33, wherein the predetermined signaling is used to indicate a density and/or a pattern of the demodulation reference signal, and is also used to indicate a scheduling resource.
The apparatus for configuring a demodulation reference signal according to claim 33, wherein the preset signaling is used to indicate a pattern of demodulating a reference signal, and is further used to indicate a slot structure, wherein The pattern of the demodulation reference signal includes at least one of the following:

The time domain position of the demodulation reference signal subset, the number of time domain symbols, the number of orthogonal ports that can support the maximum, and the number of subsets included in the demodulation reference signal.
The apparatus for configuring a demodulation reference signal according to claim 33, wherein said indication unit indicates a pattern and/or density and/or sequence and/or time for demodulating the reference signal by indicating at least one of the following signals. The number of domain symbols and / or whether it is transmitted simultaneously with the data:

Signaling indicating modulation and coding mode, signaling indicating transmission mode, retransmission indication signaling, and receiving mode;

The pattern of the demodulation reference signal includes at least one of the following:

The number of time domain symbols, whether or not the information is transmitted simultaneously with the data.
The apparatus for configuring a demodulation reference signal according to claim 33, wherein the preset signaling is used to indicate a multiplexing mode and/or a demodulation reference of a plurality of ports of the demodulation reference signal on a time domain symbol. The pattern of the signal is also used to indicate whether the phase noise reference signal is present;

The multiplexing mode refers to time division multiplexing or code division multiplexing.
The apparatus for configuring a demodulation reference signal according to claim 33, wherein said indication unit indicates, by signaling, a density and/or an orthogonality of a demodulation reference signal corresponding to a different demodulation reference signal group of the second communication node Different code lengths;

The different demodulation reference signal groups correspond to at least one of the following: different resource groups, different demodulation reference signal ports, different transmission codewords, and different transmission layers.
The apparatus for configuring a demodulation reference signal according to claim 33, wherein the indication unit configures, by the higher layer signaling, a plurality of demodulation reference signal parameters to the second communication node; or, by a higher layer signaling, from a predefined The demodulation reference signal pattern is configured to a part of the pattern of the second communication node, and the indication unit notifies, by dynamic signaling, which parameter or pattern of the demodulation reference signal used by the second communication node is the higher layer signaling .
The apparatus for configuring a demodulation reference signal according to claim 33, wherein the demodulation parameter The bandwidth of the test signal transmission can be divided into multiple sub-bands, where each sub-band is a complete sequence.
The apparatus for configuring a demodulation reference signal according to claim 45, wherein said predetermined signaling is used to indicate a root sequence used by a demodulation reference signal on a subband of a transmitting unit, Indicating a different subband of the demodulation reference signal on the same transmitting unit, and/or the same subband of different transmitting units, and/or a root sequence used on different subbands of different transmitting units;

Wherein, the root sequences on different sub-bands are different or the same; the root sequences on the same sub-band of different transmitting units are different or the same.
The apparatus for configuring a demodulation reference signal according to claim 45, wherein said predetermined signaling is used to indicate a cyclic shift sequence used by a demodulation reference signal on a subband of a transmitting unit, a cyclic shift sequence used to indicate different subbands of the demodulation reference signal on the same transmitting unit, and/or the same subband of different transmitting units, and/or different subbands of different transmitting units;

Wherein, the order of the cyclic shift sequences on different sub-bands is different or the same; wherein, the order of the cyclic shift sequences on the same sub-band of different transmitting units is different or the same.
The apparatus for configuring a demodulation reference signal according to claim 45, wherein said predetermined signaling is used to indicate a pattern number used by a demodulation reference signal on a subband of a transmitting unit, Indicating a different sub-band of the demodulation reference signal on the same transmitting unit, and/or the same sub-band of different transmitting units, and/or a pattern number used on different sub-bands of different transmitting units;

The sequence numbers of the different sub-bands are different or the same; wherein the code numbers on the same sub-bands of different transmission units are different or the same.
The apparatus for configuring a demodulation reference signal according to claim 45, wherein said indicating unit uses said signaling to indicate that a bandwidth used by said second communication node for demodulating reference signal transmission supports multiple according to different lengths of subbands Division method.
A device for configuring a demodulation reference signal applied to a second communication node, the device include:

a determining unit, configured to determine a parameter used for demodulating the reference signal by receiving preset signaling sent by the first communications node; wherein the parameter used for demodulating the reference signal comprises at least one of: demodulating a reference signal The type of the sequence, the time domain position, the pattern, the density, the orthogonal code length, the root sequence, the cyclic shift sequence, the number of ports, the number of time domain symbols, and whether or not the information is transmitted simultaneously with the data.
The apparatus for configuring a demodulation reference signal according to claim 50, wherein said determining unit determines said demodulation reference signal by signaling from said first communication node for indicating a positive/negative acknowledgment feedback delay Parameters.
The apparatus for configuring a demodulation reference signal according to claim 50, wherein said determining unit determines a sequence used for said demodulation reference signal by signaling from said first communication node for indicating a demodulation reference signal pattern kind of.
The apparatus for configuring a demodulation reference signal according to claim 50, wherein said determining unit determines said demodulation reference signal by signaling from said first communication node for indicating a number of demodulation reference signal ports Whether the frequency domain is continuous or discontinuous.
The apparatus for configuring a demodulation reference signal according to claim 50, wherein said determining unit determines said demodulation reference by signaling from said first communication node for indicating a demodulation reference signal pattern and/or density The orthogonal code length used by the signal; or,

The demodulation reference signal pattern and/or density is determined by signaling from the first communication node indicating the orthogonal code length used by the demodulation reference signal.
The apparatus for configuring a demodulation reference signal according to claim 50, wherein said determining unit determines an orthogonal code length used for demodulating the reference signal by at least one of following indication signaling from the first communication node:

Signaling indicating the length of the time domain scheduling symbol, signaling indicating the maximum length of the orthogonal code, signaling indicating the parameter of the demodulation reference signal.
The apparatus for configuring a demodulation reference signal according to claim 50, wherein said determining unit determines a density and/or a pattern of said demodulation reference signal by signaling from said first communication node for indicating a scheduling resource .
The apparatus for configuring a demodulation reference signal according to claim 50, wherein said determining unit determines density and/or pattern and/or pattern and/or pattern of said demodulation reference signal by at least one of following signaling from a first communication node The number of time domain symbols and / or whether it is transmitted simultaneously with the data:

Signaling indicating modulation and coding mode, signaling indicating transmission mode, retransmission indication signaling, and receiving mode.
The apparatus for configuring a demodulation reference signal according to claim 50, wherein said determining unit receives the signaling of the first communication node indicating a density of demodulation reference signals corresponding to different demodulation reference signal groups and/or The orthogonal code lengths are different;

The different demodulation reference signal groups correspond to at least one of the following: different resource groups, different demodulation reference signal ports, different transmission codewords, and different transmission layers.
The apparatus for configuring a demodulation reference signal according to claim 50, wherein the determining unit receives a plurality of demodulation reference signal parameters configured by the first communication node by higher layer signaling; or a plurality of demodulation reference signal patterns are defined to be allocated to a part of the pattern of the second communication node, and the determining unit knows that the parameter or pattern of the demodulation reference signal is high layer signaling by dynamic signaling from the first communication node. Which one of them.
The apparatus for configuring a demodulation reference signal according to claim 50, wherein the bandwidth of the demodulation reference signal transmission is divided into a plurality of sub-bands, wherein each sub-band is a complete sequence.
The apparatus for configuring a demodulation reference signal according to claim 60, wherein said determining unit passes a root sequence used by said first communication node for indicating a demodulation reference signal on a subband of a receiving unit Signaling to determine different subbands of the demodulation reference signal on the same receiving unit, and/or different subbands of different receiving units, and/or different subbands of different receiving units The root sequence used above;

Wherein, the root sequences on different sub-bands are different or the same; wherein the root sequences on the same sub-band of different receiving units are different or the same.
The apparatus for configuring a demodulation reference signal according to claim 60, wherein said determining unit passes a cyclic shift from said first communication node for indicating a demodulation reference signal on a subband of a receiving unit Sequence signaling to determine different subbands of the demodulation reference signal on the same receiving unit, and/or different subbands of different receiving units, and/or cyclic shift sequences used on different subbands of different receiving units;

Wherein, the order of the cyclic shift sequences on different sub-bands is different or the same; wherein the order of the cyclic shift sequences on the same sub-band of different receiving units is different or the same.
The apparatus for configuring a demodulation reference signal according to claim 60, wherein said determining unit passes a pattern number used by said first communication node for indicating a demodulation reference signal on a sub-band of a receiving unit Signaling to determine different sub-bands of the demodulation reference signal on the same receiving unit, and/or different sub-bands of different receiving units, and/or pattern numbers used on different sub-bands of different receiving units;

The numbers of the patterns on the different sub-bands are different or the same; wherein the numbers of the patterns on the same sub-bands of different receiving units are different or the same.
The apparatus for configuring a demodulation reference signal according to claim 60, wherein said determining unit determines the used subband division method based on the indication signaling from the first communication node.
A computer storage medium having stored therein computer executable instructions configured to perform the method of configuring a demodulation reference signal of any of claims 1-17.
A computer storage medium having stored therein computer executable instructions configured to perform the configuration of any one of claims 18-32 A method of demodulating a reference signal.