CN108024342B

CN108024342B - Method and device for configuring demodulation reference signal

Info

Publication number: CN108024342B
Application number: CN201610962502.1A
Authority: CN
Inventors: 蒋创新; 弓宇宏; 梅猛; 陈艺戬; 张楠; 李儒岳; 鲁照华
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-11-04
Filing date: 2016-11-04
Publication date: 2023-04-18
Anticipated expiration: 2036-11-04
Also published as: CN108024342A; WO2018082244A1

Abstract

The invention discloses a method and a device for configuring demodulation reference signals, wherein the method comprises the following steps: the first communication node indicates parameters used by the demodulation reference signal to the second communication node through preset signaling; wherein the parameter for demodulating the reference signal comprises at least one of: the demodulation reference signal comprises the types of sequences, time domain positions, patterns, density, orthogonal code length, root sequences, cyclic shift sequences and the number of ports.

Description

Method and device for configuring demodulation reference signal

Technical Field

The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for configuring demodulation reference signals in a 5G communication research direction.

Background

Currently, the physical layer technology of the New air interface (NR) is under fire thermal discussion in the third Generation Partnership Project (3 gpp,3rd Generation Partnership Project) RAN 1. While flexibility and efficiency have been the goals pursued by NR physical layer design. The pursuit of maximum flexibility for the physical layer demodulation reference signals also seems to be a trend. This is because the requirements for demodulating the reference signal may be different for different application scenarios.

For example, for a user moving at a high speed, in a time domain transmitting unit, the density of the demodulation reference signal in the time domain should be high to satisfy the characteristic of fast channel change in the time domain caused by high doppler shift, while for a low-speed user, the demodulation reference signal in the time domain may be looser due to the slow channel change in the time domain. As shown in fig. 1, in one time domain unit, the base station can be configured to high speed users 2 column reference signals and configured to low speed users 1 column demodulation reference signals.

For another example, for a user with a relatively large angular spread, because the channel is not flat in the frequency domain, the base station needs to configure the user with a high density of demodulation reference signals in the frequency domain, and if the channel of the user is relatively flat in the frequency domain, the base station may configure the user with a low density of demodulation reference signals in the frequency domain. As shown in fig. 2, the left graph is the high density demodulation reference signal in the frequency domain, and the right graph is 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 rapidly demodulate the demodulation reference signal to demodulate data, i.e., accelerate data demodulation. However, there may be an impact on the channel estimation. If the demodulation reference signal is placed in the middle of a time domain unit, the performance of channel estimation is good, but the fast data demodulation is not facilitated. As shown in fig. 3, the left diagram is that the demodulation reference signal is placed at the front end of the transmission unit, and the right diagram is placed in the middle of the transmission unit.

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

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

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

In addition, if the NR employs a ZC sequence, a multiple-segment concatenation method is proposed. As shown in FIG. 5, the bandwidth used for demodulating the reference signal is divided into a number of subbands, each of which is used for transmitting a complete ZC sequence, i.e., the length of a ZC sequence is equal to the length of the subband. The benefit of this scheme is that the sequence of demodulation reference signals can be derived according to the allocated resource location and does not vary according to the allocated resource length. But details are yet to be further designed to achieve maximum interference randomization and minimum signaling overhead. As described in LTE 36.211, the root or root sequence of a ZC sequence refers to the u or v value of an uplink reference signal in LTE.

Disclosure of Invention

To solve the foregoing technical problem, embodiments of the present invention provide a method and an apparatus for configuring a demodulation reference signal.

The method for configuring the demodulation reference signal provided by the embodiment of the invention comprises the following steps:

the first communication node indicates parameters used by the demodulation reference signal to the second communication node through preset signaling; wherein the parameter used for demodulating the reference signal comprises at least one of the following parameters: the demodulation reference signal comprises the types of sequences, time domain positions, patterns, density, orthogonal code length, root sequences, cyclic shift sequences and the number of ports.

the second communication node determines parameters used for demodulating the reference signal by receiving preset signaling sent by the first communication node; wherein the parameter for demodulating the reference signal comprises at least one of: the demodulation reference signal comprises the types of sequences, time domain positions, patterns, density, orthogonal code lengths, root sequences, cyclic shift sequences and the number of ports.

The device for configuring the demodulation reference signal provided by the embodiment of the invention is applied to a first communication node, and comprises:

an indicating unit, configured to indicate, to a second communication node through a preset signaling, a parameter used for demodulating a reference signal; wherein the parameter for demodulating the reference signal comprises at least one of: the demodulation reference signal comprises the types of sequences, time domain positions, patterns, density, orthogonal code length, root sequences, cyclic shift sequences and the number of ports.

The device for configuring the demodulation reference signal provided by the embodiment of the invention is applied to a second communication node, and comprises the following components:

a determining unit, configured to determine a parameter used for demodulating a reference signal by receiving a preset signaling sent from a first communication node; wherein the parameter for demodulating the reference signal comprises at least one of: the demodulation reference signal comprises the types of sequences, time domain positions, patterns, density, orthogonal code length, root sequences, cyclic shift sequences and the number of ports.

In the technical scheme of the embodiment of the invention, a first communication node indicates parameters used for demodulating a reference signal to a second communication node through a preset signaling; wherein the parameter for demodulating the reference signal comprises at least one of: the demodulation reference signal comprises the types of sequences, time domain positions, patterns, density, orthogonal code length, root sequences, cyclic shift sequences and the number of ports. By adopting the technical scheme of the embodiment of the invention, the configuration parameters of the indication demodulation reference signal hidden by other signaling are utilized, and the signaling overhead is saved. In addition, for the multi-segment concatenation method, the root sequences on different sub-bands are cycled to ensure that the pattern change can bring interference randomization.

Drawings

FIG. 1 is a first data structure diagram according to an embodiment of the present invention;

FIG. 2 is a diagram illustrating a second example of a data structure according to the present invention;

FIG. 3 is a third exemplary diagram of a data structure according to the present invention;

FIG. 4 is a fourth exemplary data structure diagram according to the present invention;

FIG. 5 is a fifth exemplary diagram illustrating a data structure according to the present invention;

FIG. 6 is a sixth data structure diagram according to an embodiment of the present invention;

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

FIG. 8 is a block diagram eight illustrating a data structure according to an embodiment of the present invention

FIG. 9 is a diagram illustrating a data structure according to an embodiment of the present invention;

FIG. 10 is a data structure diagram of an embodiment of the present invention;

FIG. 11 is a block diagram eleven illustrating a data structure according to an embodiment of the present invention

FIG. 12 is a twelfth data structure diagram according to an embodiment of the present invention;

FIG. 13 is a thirteen schematic data structures in accordance with the embodiment of the present invention;

FIG. 14 is a fourteenth illustrative data structure in accordance with the present invention;

FIG. 15 is a fifteen data structure diagram in accordance with the present invention;

FIG. 16 is a sixteen data structure diagram according to the embodiment of the present invention;

fig. 17 is a first flowchart illustrating a method for configuring a demodulation reference signal according to an embodiment of the present invention;

fig. 18 is a second flowchart illustrating a method for configuring a demodulation reference signal according to an embodiment of the present invention; a

FIG. 19 is a first block diagram illustrating an exemplary configuration of an apparatus for configuring a demodulation reference signal according to an embodiment of the present invention;

fig. 20 is a second structural schematic diagram of an apparatus for configuring a demodulation reference signal according to an embodiment of the present invention.

Detailed Description

So that the manner in which the features and aspects of the embodiments of the present invention can be understood in detail, a more particular description of the embodiments of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings.

In the present invention, a slot may refer to a minimum time unit scheduled at a time, and is composed of a plurality of time domain symbols, such as a plurality of OFDM symbols. One slot may also refer to one subframe.

In the technical scheme of the embodiment of the invention, the indication signaling of ACK/NACK feedback time delay is used for implicitly indicating other parameters such as time domain position or pattern of the demodulation reference signal; the density and/or pattern of the demodulation reference signal is implicitly indicated by a scheduled time domain unit length, a frequency domain length, and the like. Whether the demodulation reference signal is continuous or discontinuous on the frequency domain is indicated through the signaling indicating the number of the demodulation reference signal ports. The first communication node indicates the length of the orthogonal code used for demodulating the reference signal by indicating one or more of the following signaling. The signaling indicates the length of the time domain scheduling symbol, the signaling indicates the maximum length of the orthogonal code, and the signaling indicates the parameter of the demodulation reference signal. For the ZC sequence method of multi-segment concatenation, the root sequence, cyclic shift sequence, patterns may be different on different subbands and hop over time. In addition, two or more sub-band lengths may be supported.

The first communication node in the embodiment of the present invention refers to a base station, a cell, or other devices, although other devices are not excluded. And the second communication node is typically referred to as a user terminal or the like.

the first communication node indicates the parameters used for demodulating the reference signal to the second communication node through preset signaling. The parameters used by the demodulation reference signal include one or more of the type of the sequence of the demodulation reference signal, the time domain position, the pattern, the density, the orthogonal code length, the root sequence, the cyclic shift sequence and the number of ports. The preset signaling may be Radio Resource Control (RRC) high layer signaling, or predefined information, or physical layer dynamic signaling. And the sequence of the demodulation reference signal generally refers to a PN sequence or a ZC sequence. The time domain position refers to which time domain symbol of a time domain unit the demodulation reference signal is located, for example, the left graph and the right graph of fig. 3 refer to different demodulation reference signal time domain positions. For the length of the orthogonal code, if the length is an OCC code, the length is 2, and then the length includes sequences [1] and [1-1], and two users can be distinguished by depending on OCC. And if the length of the OCC code is 4, the OCC sequence includes [ 11 1], [1-1-1 ] and [1-1-1 ], which can be used to distinguish 4 users. Of course, the orthogonal code may be other codes, such as a DFT code, for example, having a length of 3, including [1], [1exp (j × 2 × pi/3) exp (j × 2 × pi 2/3) ], [1exp (j × 2 × pi 2/3) exp (j × 2 × pi 4/3) ], and 3 users may be multiplexed by using the DFT orthogonal code. In the embodiment of the present invention, when the length of the orthogonal code is 1, that is, there is no orthogonal code, the orthogonal code sequence with the length of 1 may also be considered as [1]. If there are 2 time domain symbols of the Demodulation Reference Signal (DMRS), length-2 orthogonality may be performed on REs of the same subcarrier on the two time domain symbols, as shown in fig. 6, where [1] is used for user 1 and [1-1] is used for user 2 on two different time domain symbols on the same subcarrier.

The first communication node indicates parameters used for demodulating the reference signal to the second communication node through signaling indicating ACK/NACK feedback time delay. Due to the fact that flexible A/N feedback delay configuration is popular at present. The base station schedules the downlink data in the time slot n, and after k time slots, users can feed back whether the data demodulation is correct or not to the base station at the time of the time slot n + k. The value of k may be semi-statically configured or dynamically configured. If the value of k is small, for example, k =0, the a/N feedback and data scheduling may require a user to demodulate data quickly in one slot, and it is better that the demodulation reference signal is located at the front end of one subframe. And if the user has enough time to demodulate the data, namely the k value is large, the position of the demodulation reference signal can be placed in the middle of the time slot, which is beneficial to channel estimation.

The preset signaling is used for indicating the type of the sequence used for demodulating the reference signal when the preset signaling is used for indicating the demodulation reference signal pattern. Since the ZC sequence is preferably transmitted continuously or at equal intervals, the intervals are preferably not too large. If the base station allocates too large frequency interval of DMRS pattern to the user, the sequence can be defaulted not to be ZC sequence.

Other parameters may also implicitly indicate the kind of sequence of the demodulation reference signal. Such as implicitly indicating the length of the ZC sequence using signaling of frequency domain resource allocation. For example, if the resource allocated to the user by the base station using a certain resource allocation manner is continuous in frequency domain, or is divided into multiple segments in frequency domain, and each segment is continuous, the sequence corresponding to this resource allocation manner is a ZC sequence. If the resource allocation is discrete, the corresponding is the PN sequence. Or judging whether the ZC sequence exists according to the length of the frequency domain resource allocation.

The preset signaling is used for indicating whether the sending of the demodulation reference signal on the frequency domain is continuous or discontinuous when the preset signaling is used for indicating the number of the demodulation reference signal ports. That is, whether the demodulation reference signal is continuously transmitted or discretely transmitted in the frequency domain is related to the number of DMRS ports or the number of data layers.

When the preset signaling is used for indicating the demodulation reference signal pattern or density, the preset signaling is also used for indicating the length of the orthogonal code used by the demodulation reference signal.

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

The signaling indicates the length of the time domain scheduling symbol, the signaling indicates the maximum length of the orthogonal code, and the signaling indicates the parameter of the demodulation reference signal.

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

In NR, the DMRS patterns may be configurable, that is, the base station may configure multiple DMRS patterns for users, and different DMRS patterns may have different time-frequency densities or occupy different time-frequency resources. The length setting range of the orthogonal code may also be related to the pattern of the DMRS. For example, if there is only one DMRS column in a time slot, the length of the orthogonal code in the time domain is 1, i.e., it is not possible to distinguish different DMRS ports or users by using the orthogonal code in the time domain. And if one time slot has two columns of DMRSs, an orthogonal code with the length of 2 can be utilized in the time domain.

In addition, since the primary scheduling resource in NR may include 1 or more slots, the number of DMRS columns included in the primary scheduling element is related to the number of slots included in the scheduling element, and also related to the number of DMRSs included in one slot. The length of the orthogonal code that can be used in the time domain cannot exceed the number of DMRS columns contained in one scheduling unit at maximum. Since the speed of the users is different and the channel of the fast user changes fast in the time domain, the number of DMRS columns included in the time domain orthogonal code cannot be too large, even if the scheduling unit to which the user is allocated is long. Therefore, the base station can configure the user with a maximum orthogonal code length in a semi-static manner, and if the number of DMRS time-domain symbols contained in the scheduling unit allocated by the user is smaller than the length of the maximum orthogonal code, the length of the orthogonal code used by the actually transmitted DMRS is the number of DMRS symbols contained in the scheduling unit. And if the number of the DMRS time domain symbols contained in the scheduling unit allocated by the user is greater than the length of the maximum orthogonal code, the user transmits the DMRS or receives the DMRS according to the length of the maximum orthogonal code set by the base station.

The preset signaling is used for indicating the density and/or pattern of the demodulation reference signal and is also used for indicating scheduling resources. That is, the density and/or pattern of the demodulation reference signals is related to the signaling of the allocated resources, such as the size of the allocated resources including the time domain size and the frequency domain size. For example, if the time domain unit length allocated by the base station when scheduling users at one time is 1 time slot, it is preferable to place more than 1 demodulation reference signal of time domain symbol in the time slot, which is favorable for the receiving end to estimate doppler frequency shift and frequency offset. If the base station schedules users to allocate a plurality of slots (slots) at a time, some slots may be less populated with reference signal time domain symbols. For another example, the allocation manner of resource scheduling, such as discrete allocation or continuous allocation in the frequency domain, also indicates the DMRS pattern.

The first communication node indicates a pattern, density and/or sequence for demodulating the reference signal by indicating one or more of: signaling for indicating modulation coding mode, signaling for indicating transmission mode, signaling for retransmitting indication, and receiving mode. That is, the user may obtain information of some patterns or sequences of the DMRS according to MCS signaling configured by the base station, transmission mode signaling, such as open loop multiplexing, closed loop multiplexing, transmit diversity, and the like, whether data is retransmitted, and different reception modes of the user.

The first communication node is configured to a plurality of demodulation reference signal parameters of a second communication node through high-level signaling or configured to a part of patterns of the second communication node from a plurality of predefined demodulation reference signal patterns through high-level signaling. And, the first communication node informs the second communication node which one of the parameters or patterns of the demodulation reference signal is higher layer signaling through dynamic signaling.

Generally, in order to adapt to different application scenarios, the demodulation reference signal may have a variety of patterns, densities, sequences, orthogonal code lengths, etc. corresponding to different parameters of the demodulation reference signal. Thus, the system can predefine a large DMRS pattern or parameter set, and this DMRS set may contain all patterns, sequences, orthogonal code lengths, and so on. Since different users have different channel conditions, the base station may choose a DMRS subset from the set in a semi-static manner through high layer signaling, where the subset includes some DMRS patterns, and/or densities, time-frequency-domain locations, and/or sequences, and/or orthogonal code lengths, etc. suitable for the user. In actual scheduling, the base station needs to dynamically tell the user which of the subset of higher layer signaling configurations the DMRS parameters or patterns used in a certain scheduling unit are.

The bandwidth for demodulation reference signal transmission may be divided into several sub-bands. On each sub-band is a complete sequence.

When the preset signaling is used for indicating the root sequence used by the demodulation reference signal on one sub-band in one sending unit, the preset signaling is also used for indicating the root sequence used by the demodulation reference signal on different sub-bands on the same sending unit and/or the same sub-band of different sending units and/or different sub-bands of different sending units;

wherein the root sequences on different sub-bands are different or the same; the root sequences on the same subband for different transmission units are different or identical.

When the preset signaling is used for indicating the cyclic shift sequence used by the demodulation reference signal on one sub-band in one sending unit, the preset signaling is also used for indicating the cyclic shift sequence used by the demodulation reference signal on different sub-bands on the same sending unit and/or the same sub-band of different sending units and/or different sub-bands of different sending units;

wherein the order of the cyclic shift sequences on different sub-bands is different or the same; wherein, the cyclic shift sequences on the same subband of different sending units are different or same in sequence.

When the preset signaling is used for indicating the pattern sequence number of the demodulation reference signal used on one sub-band in one sending unit, the preset signaling is also used for indicating the pattern sequence number of the demodulation reference signal used on different sub-bands on the same sending unit, and/or the same sub-band of different sending units, and/or different sub-bands of different sending units;

wherein, the pattern serial numbers on different sub-bands are different or the same; wherein, the pattern numbers on the same sub-band of different sending units are different or the same.

Generally, each sub-band in this case uses a ZC sequence. The base station may then define the minimum frequency domain resource allocated per user to be 1 subband. Therefore, the user can obtain the corresponding DMRS sequence according to the allocated resource subband position.

And the first communication node uses the signaling to indicate that the bandwidth used by the second communication node for sending the demodulation reference signal supports a plurality of division methods according to different sub-band lengths.

If the sub-band division is too small, the characteristics of the ZC sequence are damaged, and if the sub-band is too large, the minimum scheduling frequency domain unit is too large, and a base station of some users of small packet service can only allocate too many resources to the users, so that the resources are wasted.

The embodiment of the present invention is not limited to the demodulation reference signal, and for example, the invention described in embodiment 5 can also be applied to the uplink sounding reference signal.

The embodiments of the present invention also do not limit whether uplink or downlink transmission is set forth.

The sequence of the embodiment of the present invention is not limited to the ZC sequence and the PN sequence. In particular, it relates to examples 1 to 4.

Fig. 17 is a first flowchart illustrating a method for configuring a demodulation reference signal according to an embodiment of the present invention, and as shown in fig. 17, the method for configuring a demodulation reference signal includes:

step 1701: the first communication node indicates parameters used by the demodulation reference signal to the second communication node through preset signaling; wherein the parameter for demodulating the reference signal comprises at least one of: the demodulation reference signal comprises the types of sequences, time domain positions, patterns, density, orthogonal code length, root sequences, cyclic shift sequences and the number of ports.

In the embodiment of the invention, the first communication node indicates the parameters used for demodulating the reference signal to the second communication node through a signaling indicating the ACK/NACK feedback time delay.

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

In the embodiment of the present invention, when the preset signaling is used to indicate the number of the demodulation reference signal ports, the preset signaling is also used to indicate whether the sending of the demodulation reference signal on the frequency domain is continuous or discontinuous.

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

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

signaling indicating a time domain scheduling symbol length, signaling indicating a maximum length of orthogonal codes, signaling indicating the parameter of demodulation reference signals.

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

In this embodiment of the present invention, the first communication node indicates the pattern, density and/or sequence used for demodulating the reference signal by indicating at least one of the following signaling:

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

In the embodiment of the invention, the first communication node indicates that the densities and/or orthogonal code lengths of demodulation reference signals corresponding to different demodulation reference signal groups of the second communication node are different through signaling;

wherein the different sets of demodulation reference signals correspond to at least one of: different resource groups, different demodulation reference signal ports, different transmission code words, and different transmission layer numbers.

In the embodiment of the invention, the first communication node configures a plurality of demodulation reference signal parameters for the second communication node through high-level signaling; or, a part of patterns are configured to the second communication node from a plurality of predefined demodulation reference signal patterns through high-layer signaling, and the first communication node informs the second communication node which one of the parameters or patterns of the demodulation reference signal used by the first communication node is high-layer signaling through dynamic signaling.

In the embodiment of the present invention, a bandwidth for sending the demodulation reference signal may be divided into a plurality of sub-bands, where each sub-band is a complete sequence.

In the embodiment of the present invention, when the preset signaling is used to indicate a root sequence used by a demodulation reference signal on a subband in a sending unit, the preset signaling is further used to indicate a root sequence used by a demodulation reference signal on a different subband in the same sending unit, and/or the same subband in different sending units, and/or different subbands in different sending units;

wherein the root sequences on different sub-bands are different or the same; the root sequences on the same subband for different transmission units are different or the same.

In the embodiment of the present invention, when the preset signaling is used to indicate a cyclic shift sequence used by a demodulation reference signal on a subband in a sending unit, the preset signaling is further used to indicate cyclic shift sequences used by demodulation reference signals on different subbands in the same sending unit, and/or the same subband in different sending units, and/or different subbands in different sending units;

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

In the embodiment of the present invention, when the preset signaling is used to indicate the pattern sequence number of the demodulation reference signal used on one subband in one sending unit, the preset signaling is also used to indicate the pattern sequence number of the demodulation reference signal used on different subbands in the same sending unit, and/or the same subband in different sending units, and/or different subbands in different sending units;

wherein, the pattern serial numbers on different sub-bands are different or the same; the pattern numbers on the same subband of different sending units are different or the same.

In the embodiment of the present invention, the first communication node uses the signaling to instruct the second communication node that the bandwidth used for sending the demodulation reference signal supports multiple division methods according to different sub-band lengths.

Fig. 18 is a second flowchart illustrating a method for configuring a demodulation reference signal according to an embodiment of the present invention, and as shown in fig. 18, the method for configuring a demodulation reference signal includes:

step 1801: the second communication node determines parameters used for demodulating the reference signal by receiving preset signaling sent by the first communication node; wherein the parameter for demodulating the reference signal comprises at least one of: the demodulation reference signal comprises the types of sequences, time domain positions, patterns, density, orthogonal code lengths, root sequences, cyclic shift sequences and the number of ports.

In this embodiment of the present invention, the second communication node determines the parameter of the demodulation reference signal through signaling from the first communication node for indicating ACK/NACK feedback delay.

In this embodiment of the present invention, the second communication node determines the kind of the sequence used by the demodulation reference signal through signaling indicating a demodulation reference signal pattern from the first communication node.

In this embodiment of the present invention, the second communication node determines whether the demodulation reference signal is transmitted continuously or discontinuously in the frequency domain through signaling from the first communication node, where the signaling is used to indicate the number of demodulation reference signal ports.

In the embodiment of the present invention, the second communication node determines the length of the orthogonal code used by the demodulation reference signal through a signaling indicating a demodulation reference signal pattern and/or density from the first communication node; alternatively, the first and second electrodes may be,

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

In this embodiment of the present invention, the second communication node determines the length of the orthogonal code used for demodulating the reference signal through at least one of the following indication signaling from the first communication node:

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

In this embodiment of the present invention, the second communication node determines the density and/or pattern of the demodulation reference signal through signaling from the first communication node for indicating scheduling resources.

In this embodiment of the present invention, the second communication node determines the density and/or pattern of the demodulation reference signal through at least one of the following signaling from the first communication node:

In the embodiment of the invention, the second communication node receives the signaling of the first communication node to indicate that the densities and/or the lengths of orthogonal codes of demodulation reference signals corresponding to different demodulation reference signal groups are different;

In the embodiment of the invention, the second communication node receives a plurality of demodulation reference signal parameters configured by the first communication node through high-level signaling; or a part of patterns are configured to the second communication node from a plurality of predefined demodulation reference signal patterns through high-layer signaling, and the second communication node knows which one of the parameters or the patterns of the demodulation reference signal is high-layer signaling through dynamic signaling from the first communication node.

In the embodiment of the present invention, a bandwidth for sending the demodulation reference signal is divided into a plurality of sub-bands, where each sub-band is a complete sequence.

In the embodiment of the present invention, the second communication node determines, through signaling from the first communication node, a root sequence used by a demodulation reference signal on a subband in a receiving unit, the root sequence used by a demodulation reference signal on different subbands in the same receiving unit, and/or the same subband in different receiving units, and/or different subbands in different receiving units;

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

In this embodiment of the present invention, the second communication node determines, through signaling from the first communication node, a cyclic shift sequence used by a demodulation reference signal on a subband in a receiving unit, a cyclic shift sequence used by a demodulation reference signal on a different subband in the same receiving unit, and/or a same subband in different receiving units, and/or a different subband in 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 the embodiment of the present invention, the second communication node determines, through signaling from the first communication node, the pattern sequence number used by the demodulation reference signal on one subband in one receiving unit, the pattern sequence number used by 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;

wherein, the pattern serial numbers on different sub-bands are different or the same; the pattern numbers on the same sub-band of different receiving units are different or the same.

In this embodiment of the present invention, the second communication node determines the used sub-band division method according to the indication signaling from the first communication node.

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

Example 1

The first communication node indicates parameters used by the demodulation reference signal to the second communication node through a signaling indicating A/N feedback time delay, wherein the parameters comprise patterns, density, time domain position, frequency domain position and the like. Due to the fact that flexible A/N feedback delay configuration is popular at present. The base station schedules the downlink data in the time slot # n, and after k time slots, users can feed back whether the data demodulation is correct or not to the base station at the time of the time slot # n + k. The value of k may be semi-static or dynamic. If the value of k is small, for example, k =0, the a/N feedback and data scheduling may require a user to demodulate data quickly in one slot, and it is better that the demodulation reference signal is located at the front end of one subframe. If the user has enough time to demodulate the data, i.e. the k value is large, the position of the demodulation reference signal can be placed in the middle of the time slot, which is beneficial to channel estimation.

That is, the value of k has a relationship with the time domain position, pattern, etc. of the demodulation reference signal.

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 a value of k in the physical layer control channel, if the value of k is equal to 0, the demodulation reference signal will be transmitted at the front end of the time slot, otherwise the demodulation reference signal is transmitted in the middle of the time slot. Of course, the value of k may be semi-statically configured for higher layer signaling.

The base station may set a k _ threshold, and if the value of k is less than the k _ threshold, the demodulation reference signal is at the front end of the time slot, otherwise at some position in the middle of the time slot. The k _ threshold values for different users may be different, depending on the semi-static higher layer signaling configuration.

By inferring the temporal position, pattern, etc. of the reference signal from the value of k, signaling overhead may be saved without failure activity.

It is noted that, in the embodiments of the present invention, the DMRS pattern or the time domain position is indicated by using the k value, and parameters such as the DMRS pattern may be indicated in combination with explicit signaling or other implicit signaling. For example, one user is configured with multiple DMRS patterns, and the DMRS patterns may be divided into multiple sets, for example, 2 sets. And implicitly indicating a certain set by using the k value, and then indicating a certain pattern in the set by using the dynamic information in the DCI. As shown in fig. 10 a. The user is configured with 4 patterns, with smaller k values implicitly indicating

patterns

1 and 2, and larger k values implicitly indicating

patterns

3 and 4. Thus, if k =0, the user can know whether

DMRS Pattern

1 or 2 is available, and the base station needs to use an extra 1bit to indicate whether

Pattern

1 or 2 is available.

Example 2

When the preset signaling is used to indicate the number of the demodulation reference signal ports, the preset signaling is also used to indicate whether the transmission of the demodulation reference signal on the frequency domain is continuous or discontinuous, that is, the first communication node indicates to the second communication node through the signaling indicating the number of the demodulation reference signal ports whether the transmission of the demodulation reference signal on the frequency domain is continuous or discontinuous. That is, whether the demodulation reference signal is continuously transmitted or discretely transmitted in the frequency domain is related to the number of DMRS ports or the number of data layers.

The uplink DMRS of LTE uses ZC sequence, i.e. DMRS must be continuously transmitted on one time domain symbol in one scheduling frequency domain section. While the DMRS sequence of one user in the interleaving-based frequency division multiple access (IFDMA) scheme may be transmitted at equal intervals, similar to the transmission of the Sounding Reference Signal (SRS) in the uplink, as shown in the right diagram of fig. 2.

Generally, when performing low rank scheduling, the delay spread (delay spread) is smaller, and when performing high rank scheduling, the delay spread is larger, and the channel frequency selectivity is increased.

For some delay spread is small, and rank is small, RS needs power boosting user, for example, for uplink, rank < =2, IFDMA scheme may be adopted, that is, discontinuous transmission; rank =3or 4, a continuous DRMS scheme may be employed. This is because when rank =4, consecutive transmission assumes that channels are the same in every 4 consecutive REs in the frequency domain for orthogonality, and if the IFDMA scheme is used, it must assume that channels are the same in every 8 consecutive REs for orthogonality.

For example, if a user DMRS port is signaled in DCI>That is, means that DMRS is continuously transmitted on the frequency domain, the CS field indicator indication may refer to table 2. And if DMRS port<=2, then indicate that DMRS uses IFDMA scheme on frequency domain, refer to table 1. Since the CS indication is repeated in table 1. Where comb #0 refers to DMRS reference signals occupying even subcarriers,and comb #1 indicates that the reference signal occupies odd subcarriers.

Referred to as cyclic shift, in the same sense as in LTE.

TABLE 1

TABLE 2

Example 3

When the preset signaling is used to indicate the density and/or pattern of the demodulation reference signal, the preset signaling is also used to indicate the scheduling resource, that is, the first communication node indicates the density and/or pattern of the demodulation reference signal to the second communication node through the signaling indicating the scheduling resource.

That is, the density, and/or pattern of the demodulation reference signals is related to the signaling of the allocated resources. For example, if the time domain unit length allocated by the base station when scheduling users at one time is 1 time slot, it is preferable to place more than 1 demodulation reference signal of time domain symbol in the time slot, which is favorable for the receiving end to estimate doppler frequency shift and frequency offset. However, if the base station allocates multiple slots for the scheduled user at a time, some slots may be less in placement of some reference signal time domain symbols, instead of the DMRSs of each slot being the same.

For example, different DMRS patterns are configured for different scheduling element lengths, and one or more DMRS time-domain symbols placed at equal intervals may be used to transmit DMRSs. If the user channel is relatively slow, if the base station schedules a slot, one DMRS may be placed at the front end of the slot, as illustrated in the upper diagram of fig. 8. And if the time slot scheduled by the base station is 3slots, only the DMRS is placed on the first time domain symbol of the scheduling unit, because the channel is slow, not too many DMRSs are needed, as shown in the lower diagram of fig. 8.

The various DMRS patterns are shown in the lower graph of fig. 8, fig. 9-a, and fig. 9-b. Respectively placing DMRS on only one OFDM symbol of a scheduling time unit; in a scheduling time unit, a first time domain symbol is taken as an initial position, and two DMRSs are placed at equal intervals; and in a scheduling time unit, the first OFDM symbol is taken as a starting position, and three DMRSs are placed at equal intervals.

Optionally, the base station may configure multiple sets of DMRS patterns for each scheduling unit, where the multiple sets of DMRS patterns include DMRS configurations with different time domain densities, where each set of DMRS configuration includes one or more time domain symbols placed at equal intervals, and may be used to send a DMRS, and notify, through a high-layer signaling or a physical layer dynamic signaling, a DMRS pattern used in a current scheduling time unit. For example, as described above, there are multiple DMRS patterns for 3slots, and then the base station informs which pattern the 3slots are scheduled in through signaling. The equally spaced DMRS placement refers to placing DMRSs equally spaced before the end position of a data channel in one scheduling unit, with the first time domain symbol of the data channel as the starting position.

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

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

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

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

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

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

Each DMRS pattern set comprises at least one DMRS pattern;

each DMRS pattern includes one or more OFDM symbols placed at equal intervals for transmitting DMRSs, and the DMRSs may be mapped in the OFDM symbols in a manner of subcarriers at equal intervals.

Where N1, N2 are positive integers smaller than N, and the values of N1, N2 are predefined or signaled through broadcast/RRC signaling.

The DMRS patterns may be divided into multiple sets, and different resource allocation sizes or allocation manners may correspond to different DMRS pattern sets. Including the size and manner of time domain and frequency domain allocation resources.

For example, if the frequency domain resources allocated by the scheduling unit are different in size, the DMRS pattern sets may also be different. For example, the pattern of the DMRS includes 4 patterns, as shown in fig. 10 a. If the allocated resource in the frequency domain is larger or exceeds a threshold, channel estimation interpolation can be performed in the frequency domain, and

patterns

2 and 4 of the DMRS can be mapped at this time, that is, the density in the frequency domain can be reduced. Otherwise it is

pattern

2 or 4. After the DMRS pattern sets are determined, other implicit or clear signaling may be needed to indicate which of the sets is.

In addition, whether PRB binding is performed during scheduling or not, the length of the bound PRB can also be used for implicitly indicating the pattern of the DMRS. The PRB binding means that the precoding used for scheduling in N PRBs is the same or similar, so that the channel estimation on DMRS or data of different PRBs can be interpolated, and whether the channel interpolation is needed in the PRBs is not needed.

Example 4

When the preset signaling is used to indicate the demodulation reference signal pattern or density, the preset signaling is also used to indicate the length of the orthogonal code used by the demodulation reference signal, that is, the signaling used by the first communication node to indicate the demodulation reference signal pattern or density to the second communication node may also be used to indicate the length of the orthogonal code used by the demodulation reference signal.

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

Or, it can also be said that the orthogonal code length used by the first communication node to indicate the demodulation reference signal to the second communication node can 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 length of the orthogonal code of the demodulation reference signal.

That is, the length of the orthogonal code used by the DMRS is related to one or more of the pattern, the density of the demodulation reference signal, the length of the time domain scheduling unit, the maximum length of the configured orthogonal code, and the like. That is, the length of the orthogonal code for the DMRS is related to the above parameters, but does not necessarily depend on the parameters completely, and it is also possible to determine the pattern position of the DMRS by combining clear signaling and the parameters.

In NR, DMRS patterns may be configurable, that is, a base station may configure users with multiple DMRS patterns, and different DMRS patterns may have different time-frequency densities or occupy different time-frequency resources. For example, a set of DMRS patterns in one slot is shown in fig. 10a, and there are 4 patterns in total. The base station may configure 1 of them using dynamic DCI signaling or higher layer RRC signaling. If

pattern

1 or 2 is configured, only one column of DMRS symbols cannot utilize the time-domain orthogonal code if the orthogonal code for DMRS joint between slots is not considered, that is, the length of the orthogonal code in the time domain is equal to 1. At this time, the orthogonal code length in the frequency domain may also need other explicit signaling or implicit indication to the user. For example, if the base station informs the user of pattern 1, the orthogonal code length in the frequency domain may be 1,2,3,4, or 1,2,4, or 2,4, and other signaling is used to inform the user. If predefined rules or higher layer signaling informs that the time domain orthogonal code can only be used in one time slot, as shown in fig. 10a, if the base station configures DMRS pattern 3or 4 to the user, the length of the time domain orthogonal code is 2. The orthogonal codes used by the two port DMRSs on the two columns RS are [1] and [1-1], respectively. And if the base station configures the

DMRS pattern

1 or 2 for the user, the length of the orthogonal code used in the time domain is 1.

The length of the orthogonal code may be considered in the time domain alone or in the frequency domain alone. As shown in fig. 10a, if the base station configures

pattern

1 or 3 for the user, it can be considered that the length of the orthogonal code in the frequency domain is 4, i.e. every 4 consecutive subcarriers in the frequency domain are orthogonal. As shown in fig. 10b, 4 ports or users can be distinguished in frequency domain by orthogonal codes with length of 4, and the orthogonal codes of 4 ports on consecutive 4 REs are [ 11 1], [1-1-1 ] and [1-1-1 ] respectively. Since the 4 REs are continuous in the frequency domain, the channel is relatively similar, and the effect is relatively good by using the orthogonal code with the length of 4. This case is suitable for the case that the number of DMRS ports is large, or the number of users is large when multi-user multiplexing is performed. And if the number of users is small or the number of ports is small, the density of the DMRS is not as dense in the frequency domain, and the base station can be configured to the

user DMRS pattern

2 or 4. As in fig. 10c. Two subcarriers consecutive at this time are used as orthogonality.

In other words, whether the orthogonal code length transmitted by the DMRS is 2 or 4 may not be explicitly signaled or signaled with a small amount of signaling, because the base station may implicitly notify the user of some information about the orthogonal code length using signaling indicating the DMRS pattern. Of course, once the length of the orthogonal code is determined, such as 2, then whether the sequence of the orthogonal code is [1] or [1-1] or signaled.

Of course, the length of the orthogonal code may be considered in joint time and frequency domains. For different DMRS patterns, the joint orthogonal code lengths are different. As shown in fig. 10a, if the base station is configured to the user DMRS pattern 4, according to the above description, since the time domain may be an orthogonal code with a length of 2, and the frequency domain may also be an orthogonal code with a length of 2, if the time domain and the frequency domain are considered together, the length of the orthogonal code is 4. Among the 4 REs (2 in time domain and 2 in frequency domain) as shown in fig. 10d, a maximum of 4 DMRS ports or users can be distinguished by using an orthogonal code with a length of 4.

However, since the primary scheduling resource in NR may include 1 or more slots, the number of DMRS columns included in a primary scheduling element is related to the number of slots included in the scheduling element, and also related to the number of DMRSs included in one slot. 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 at maximum. Since the speed of the users is different, and the channel of the fast user changes fast in the time domain, the number of DMRS columns included when using the time domain orthogonal code cannot be too large, even if the scheduling unit to which the user is allocated is long. Therefore, the base station can configure the user with a maximum orthogonal code length in a semi-static manner, and if the number of DMRS time-domain symbols contained in the scheduling unit allocated by the user is smaller than the length of the maximum orthogonal code, the length of the time-domain orthogonal code used by the actually transmitted DMRS is the number of DMRS symbols contained in the scheduling unit. And if the number of the DMRS time domain symbols contained in the scheduling unit allocated by the user is greater than the length of the maximum orthogonal code, the user transmits the DMRS or receives the DMRS according to the length of the maximum orthogonal code set by the base station.

As mentioned above, since the base station may schedule a plurality of timeslots at a time, it is also a point of the present invention to achieve the maximum flexibility with less signaling. If 1bit is fixed in the DCI to indicate 1slot or 2slots at a time for scheduling, or fixed 2bits to indicate 1,2,3,4 slots, or 1,2,4,8 slots. The flexibility is not sufficient. Since for some users with large data size, there may be no need to configure 1 or 2slots, while 6 slots are needed, or more slots need to be scheduled in one schedule. A new method is as follows.

The base station may configure different minimum scheduling units to different users through higher layer signaling, and the minimum scheduling unit may include, for example, 1,2,4,8 slots. Then, a few bits signaling is used to dynamically inform a user that a few minimum scheduling units are scheduled in one-time scheduling in the DCI, for example, 2bits are used to dynamically indicate 1,2,4,8 or 1,2,3,4 minimum scheduling units. For example, assuming that the base station allocates UE0 with the minimum scheduling unit of 1slot and U1 with the minimum scheduling unit of 2slots, for UE0,2bits (indicating 1,2,3,4 minimum scheduling units) represents 1,2,3,4 slots, and for U1,2bits represents 2,4,6,8 slots scheduling.

The maximum orthogonal code lengths configured by different users may be different or the same. For example, the length of a predefined time-domain orthogonal sequence configuring all users is the number of DMRS symbols in a minimum scheduling unit. I.e. the orthogonal code in time domain can only be used in a minimum scheduling unit.

Of course, the orthogonal code may be limited to one time slot or several time slots. The orthogonal code lengths of different users are different. That is, the base station can configure the user with the time domain orthogonal code in several time slots through signaling. For example, the base station indicates that a user 0 orthogonal code can be used in 2slots through high layer signaling, and indicates that the DMRS pattern of the user includes 2 columns of DMRSs through DCI, and the user has more than 2slots of scheduling resources, the length of the orthogonal code in the time domain is 4, and if the user has 1slot of scheduling resources, the length of the orthogonal code in the time domain is 2. That is, the base station may define the maximum applicable time domain range of the orthogonal code through signaling, and then determine the actual transmission length of the orthogonal code through the actual DMRS pattern and the scheduling information.

If a primary scheduling unit contains N slots and one slot contains M DMRS symbols, the length of an orthogonal code such as an OCC can be up to N × M at most. On one hand, since the OCC length depends on the moving speed of the user, the OCC length is not too long, otherwise the channel estimation accuracy is affected. On the other hand, the introduction of an appropriate OCC can enhance the channel estimation accuracy and can multiplex different sequences (even if the ZC sequences of the two DMRSs are not the same length or sequence-by-sequence), so the introduction of orthogonal codes is also necessary. Whether OCC is carried out or not depends on DMRS pattern and the length of a scheduling unit, so that the actual OCC length is better implicitly indicated by at least one parameter of the three parameters according to the number of DMRS symbols, the length of the scheduling unit, the maximum OCC length configured by RRC or the number of time slots which can be used by the OCC configured by RRC. The maximum OCC length is more appropriate to be 2 or 4 by synthesizing the channel estimation characteristics, the standard complexity and the control signaling overhead for analysis. Or the maximum usable time slot range of the orthogonal code is limited to 1,2,4 or 8 time slots. The range of different users may be different.

May depend on the number of DMRS symbols in the minimum scheduling unit. And performing OCC in a minimum scheduling unit. If one minimum scheduling unit is 2slots, the length of the OCC is equal to the number of DMRS symbols in the two slots.

The maximum OCC length can be configured semi-statically and is UE specific. For example, the base station configures the maximum orthogonal code length =2 for the user, and if the user only allocates one slot and only one DMRS symbol, the OCC is not needed, but if the resource allocated to the user includes more than 2 DMRS symbols, the OCC with the length of 2 is needed.

For example, 3bits is used to inform CS, OCC, comb values.

If cyclic shift of the LTE uplink DMRS (ZC sequence), OCC mapping table, if the actual OCC length is equal to 2, as shown in table 3 below:

TABLE 3

If the actual OCC length is equal to 1, then the indication of the OCC value is ignored in table 3 above, and different DMRS ports may also be multiplexed by 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 one subband in one transmission unit, and may also be configured to indicate a root sequence used by a demodulation reference signal on a different subband in the same transmission unit, and/or the same subband in different transmission units, and/or a different subband in different transmission units.

Where the root sequence may be different on different subbands.

Wherein, the root sequences on the same subband may be different for different transmitting units.

Generally, in this case, each sub-band (block) uses a ZC sequence. The base station may then define the minimum frequency domain resource allocated per user to be 1 subband. Therefore, the user can obtain the corresponding DMRS sequence according to the allocated resource subband position. As in fig. 11, the root sequence number on each block may be different for a cell and vary with slot. One transmission unit may refer to one slot, one subframe, or a plurality of slots, a plurality of subframes. Signaling indicating the root sequence used on one transmission unit on one subband may be used to indicate the root sequences of all subbands on other subbands or on other slots. For example, the root sequence of all subbands in a slot is derived from the cell ID and the slot number. The root sequence on a subband is a function of the slot number, and/or one or more of the subframe number, subband number, and cell ID. The signaling indicating the root sequence on a subband is therefore the slot number, and/or the subframe number, subband number, cell ID. Where the cell ID may be shared for different subbands, slot numbers, and/or subframe numbers. While for slot number, subband number, cell ID may be shared. The root sequences on different subbands may vary over time so that sequence interference randomization may be achieved. The root sequence on a subband may be different for different cells at the same time.

A total bandwidth of all cells can be configured with a baseline sequence, for example, a root sequence for

block #

0,1 … N-1 is

root #

0,1,2, … N-1. This sequence is referred to as baseline. Root (ns, cell _ ID, block _ ID) = mod (ns + cell _ ID + baseline order of block _ ID, N) on a certain subband in one slot or subframe. The value of u for root # n is not necessarily 0. For example, 25 root values in total, and root # n represents the # n-th root value.

Alternatively, RRC signaling may configure the spec _ ID instead of the cell _ ID. This allows the same spec _ ID to be configured for some users of different cells. If the root sequences are identical, then different cyclic shifts can be relied upon to achieve orthogonality.

More flexibly, two or more spec _ IDs (including cell _ ID) can be configured by RRC, and a base station dynamically selects one DCI when scheduling or triggering RS. For example, two edge users of two adjacent cells include the same spec _ ID value in the spec _ ID, so if the time-frequency resources are overlapped, the DCI triggers the same spec _ ID and configures different CS values at the same time.

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

Wherein the order of the cyclically shifted sequences on different subbands may be different.

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

For the case where the order of the cyclically shifted sequences on different sub-bands is different, as in fig. 12 for one cell, the order indicated by the CS Field on each block may be different. And changes with time. As shown in slot0, the indicated order of cs indicators for subband 0 is 0,1,2,3,4,5,6,7. If the base station tells the user that the value of the CSI Field is indicator #1 (001) through DCI signaling, as in table 4-1 below, then

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

TABLE 4-1

As in fig. slot0, the order of indication for sub-band 1, cs indicator is 1,2,3,4,5,6,7,0. If the base station tells the user that the value of the CSI Field is indicator #1 (001) through DCI signaling, as in tables 4-2 or 4-3 below, then

The value of (a) is assigned a circular shift index of 0,4,2,6 or 2,6,4,0 ·>

TABLE 4-2

Tables 4 to 3

That is, since the order of the cyclic shift sequences of different subbands is different, one CSI field indication value signaled in DCI is different for different subband meanings, and the represented values of the time cyclic shifts are different. The same is true for different subframes or slots. The signaling used by the first communication node to indicate to the second communication node the cyclic shift sequence used by the demodulation reference signal on one subband in a transmission unit, and also to indicate the cyclic shift sequence used by the demodulation reference signal on a different subband in the same transmission unit, and/or on the same subband in different transmission units, and/or on a different subband in different transmission units, that is, that the CSI field indication value can be shared across multiple subbands, is described in the claims. Only one indicated value of the CSI field needs to be informed in the DCI, and the user can calculate the real CS value according to different sub-bands.

For one slot, the order of the cyclic shift sequences on each block can be calculated according to the slot number and cell ID, and signaling configuration is not needed. A baseline order, such as

CS order #

0,1,2, … N-1, can be configured on the whole bandwidth of all cells as baseline order for

block #

0,1 … N-1. The order of the cyclic shift sequences may be CS _ order (ns, cell _ ID, block _ ID) = mod (ns + cell _ ID + base order of block _ ID, N). The order of cyclic shifts on adjacent bandwidths is shifted by one bit for the same subframe, as shown in fig. 12.

Of course, as with the root sequence approach described above, the cell ID may be replaced with a spec _ ID. This spec _ ID may be the same as the spec _ ID mentioned in the root sequence above. I.e. the base station only needs to inform one spec _ ID.

The signaling described in the embodiment of the present invention refers to these spec _ IDs or cell IDs, timeslot numbers, subframe numbers, etc. In one sub-frame or time slot, all sub-bands can deduce the cyclic shift sequence order on each sub-band according to the same spec _ ID.

The first communication node is used for indicating the demodulation reference signal to the second communication node in a sending unit

The signaling of the pattern number used on one subband in the group may also be used to indicate the pattern number used on different subbands of the demodulation reference signal on the same transmission unit and/or the same subband of different transmission units and/or different subbands of different transmission units.

Wherein, the pattern sequence numbers on different sub-bands can be different.

The pattern numbers of different sending units on the same subband may be different.

I.e., the DMRS pattern may be different between different blocks. As shown in fig. 13. The base station may configure multiple DMRS patterns, and the patterns on each subband may be different or may vary with time. The pattern on each subband may be related to the spec _ ID or cell ID, slot number or subframe number.

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

This scheme has scheduling restrictions for packet traffic because the minimum scheduling unit is limited to one block. The system of the present invention can support multiple subband partitions. For example, two kinds of partitions are supported: (1) one block =4PRBs; (2) one block =1PRBs. Different users may decide the block length by RRC configuration or DCI or according to an implicit way, such as scheduling assignment. If the scheduling and allocation mode of the user determines that the resources allocated to the user are discrete or the number of PRBs is small, the default mode is the division mode 2, otherwise, the default mode is the division mode 1.

Example 6

The first communication node indicates a pattern, density and/or sequence used for demodulating the reference signal by indicating one or more of the following: signaling for indicating modulation coding mode, signaling for indicating transmission mode, retransmitting indication signaling, and receiving mode.

Generally, higher order modulated data transmission has higher requirements for channel estimation and therefore may require a higher density of demodulation reference signals, while lower order modulated data transmission has lower requirements for channel estimation and therefore may have a lower density of demodulation reference signals. Therefore, for a plurality of DMRS Patterns configured by a user, the indication of the MCS may be divided into a plurality of sets, and meanwhile, the Patterns of the DMRS are also divided into a plurality of sets, where each MCS set corresponds to one DMRS Pattern set. For example, 5bits signaling is used to indicate the MCS values from 0 to 31, then MCS 0-15 corresponds to one DMRS pattern set, and MCS16-31 corresponds to another DMRS pattern set. As shown in fig. 13, the multiple patterns of the DMRS may be divided into 2 sets, where the first and second are one set, and the third and fourth are one set, and if the value of the signaling MCS is lower than a threshold value, the patterns of the DMRS are

patterns

1 and 2, otherwise, the patterns are

patterns

3 and 4.

For signaling of transmission mode, the base station is generally used to inform the user of transmission diversity, closed-loop spatial multiplexing, or open-loop spatial multiplexing, etc., so the signaling can be used to infer the pattern, density, etc. of DMRS. Likewise, DMRS patterns may be divided into multiple sets, and different demodulation reference signals may correspond to different sets of DMRS patterns.

In addition, if the scheduled data is retransmission data, the density of DMRSs may be different. Likewise, the DMRS patterns may be divided into multiple sets, and different sets of DMRS patterns may correspond to retransmission or first transmission. Different retransmission times may correspond to different sets of DMRS patterns. For example, the DMRS patterns of the first and second retransmissions are different. Therefore, the UE may obtain some information of the DMRS pattern according to whether or not to retransmit, or the number of retransmissions.

It is noted that only one DMRS pattern may be included in one DMRS set.

For the indication signaling of the receiving mode, the user may determine the pattern set or the pattern or the DMRS sequence of the DMRS according to different receiving mode indication signaling. For example, if the base station indicates that the user needs to perform beam scanning when receiving different signals, the DMRS pattern may be as shown in fig. 14, that is, analog beams of multiple columns of DMRSs are the same, and the user may use different receiving beams to detect the multiple columns of DMRSs, and then select a column of the best DMRSs for demodulation. At this time, DMRSs of different columns may be simply repeated without sequence change.

And if the base station indicates that the user does not need to perform receiving beam scanning during receiving, the pattern of the DMRS can correspond to a plurality of analog beams without using a plurality of columns of DMRS. In this case, if there are multiple columns of DMRSs, the corresponding sequences may be different.

Example 7

The first communication node indicates, through signaling, that the densities and/or orthogonal code lengths of demodulation reference signals corresponding to different demodulation reference signal groups of the second communication node may be different.

Wherein, different demodulation reference signal groups correspond to one or more of the following modes: different resource groups, different demodulation reference signal ports, different transmission code words and different transmission layer numbers.

In LTE, a maximum of two codewords can be transmitted per scheduling, and each codeword can contain multiple layers. Each codeword has signaling indicating HARQ process, indicating MCS, etc. Each layer may correspond to a different DMRS port.

In the future research in 5G, since different DMRS ports may come from different base stations or cells, and for whether or not there is multi-user scheduling in different cells or base stations, how many users are scheduled for multi-user MIMO may be independent. The density of different DMRS ports or port sets may achieve maximum flexibility if they may be different. As shown in fig. 15, port 1 and port 2 are denser than port 3 and port 4. If a user is scheduled with 2 codewords, codeword 1 corresponds to

layers

1 and 2, and

ports

1 and 2 correspond to

layers

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

ports

3 and 4, the density of DMRS corresponding to codeword 1 is higher than that of codeword 2. That is, the DMRSs corresponding to different DMRS ports, or codewords, or layers may have different densities. It can be seen that different DMRS resource groups have different DMRS densities, for example, as shown in fig. 15, the DMRS time-frequency resource group density in the upper block is higher than the DMRS density in the lower block. The DMRS time-frequency resource group in the upper box consists of 4 REs, while the bottom only consists of 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 length of the orthogonal code in the time domain may be 2, so that 2 ports or 2 users may be multiplexed by time-domain orthogonality. For

port

3,4, the time domain has only one DMRS symbol, and the orthogonal code length of the time domain is 1, so that

ports

3 and 4 can be distinguished only by frequency domain orthogonality or by using orthogonal codes in the frequency domain.

The first communication node is configured to a plurality of demodulation reference signal parameters of a second communication node through high-layer signaling or configured to a part of patterns of the second communication node from a plurality of predefined demodulation reference signal patterns through high-layer signaling. And, the first communication node informs the second communication node which one of the parameters or patterns of the demodulation reference signal is higher layer signaling through dynamic signaling.

The first communication node informs the second communication node of which of the higher layer signaling the parameter or pattern of the demodulation reference signal used by the second communication node is, either implicitly or explicitly or a combination of both, through dynamic signaling. The implicit notification is that the base station uses signaling for other purposes to indicate DMRS pattern information, such as MCS, a/N feedback delay, etc. as mentioned in the foregoing technical point. And clear notification means that the base station needs explicit bit to indicate DMRS information. Or a combination of both.

Generally, in order to adapt to different application scenarios, the demodulation reference signal may have a variety of patterns, densities, sequences, orthogonal code lengths, etc., corresponding to different parameters of the demodulation reference signal. Thus, the system can predefine a large DMRS pattern or parameter set, and this DMRS set may contain all patterns, sequences, orthogonal code lengths, and so on. Since different users have different channel conditions, the base station may choose a DMRS subset from the set in a semi-static manner through high layer signaling, where the subset includes some DMRS patterns, and/or densities, time-frequency-domain locations, and/or sequences, and/or orthogonal code lengths, etc. suitable for the user. In actual scheduling, the base station needs to dynamically tell the user which of the subset of higher layer signaling configurations the DMRS parameters or patterns used in a certain scheduling unit are.

For example, the predefined DMRS pattern includes 8 patterns, as shown in fig. 16. The base station can select 4 patterns from 8 patterns by using the high layer signaling, such as

Pattern

1,2,3,4, then in scheduling, the base station can inform the user of which Pattern specifically is by using the dynamic signaling, for example, using 2bits in the DCI to indicate which Pattern in the subset configured by the high layer signaling. Of course, according to the techniques included in the present invention, the base station may implicitly notify some DMRS configuration information to the user by using other parameters, for example, the DMRS pattern subset configured by the higher layer signaling is divided into two small subsets, for example,

pattern

1,2 is small subset 1, pattern3, and 4 is small subset 2. The base station may implicitly indicate whether small subset 1 or small subset 2 through MCS signaling. Thus, the base station only needs to have an extra 1bit in the DCI to indicate which DMRS pattern in the small subset is the last one.

Fig. 19 is a first schematic structural diagram of an apparatus for configuring a demodulation reference signal according to an embodiment of the present invention, as shown in fig. 19, the apparatus includes:

an indicating unit 1901, configured to indicate, to the second communications node through a preset signaling, a parameter used for demodulating the reference signal; wherein the parameter for demodulating the reference signal comprises at least one of: the demodulation reference signal comprises the types of sequences, time domain positions, patterns, density, orthogonal code length, root sequences, cyclic shift sequences and the number of ports.

In this embodiment of the present invention, the indicating unit 1901 is specifically configured to: the parameters used for demodulating the reference signal are indicated to the second communication node by signalling indicating ACK/NACK feedback delay.

In the embodiment of the present invention, when the preset signaling is used to indicate the number of the demodulation reference signal ports, the preset signaling is further used to indicate whether the transmission of the demodulation reference signal on the frequency domain is continuous or discontinuous.

In this embodiment of the present invention, the indicating unit 1901 is specifically configured to: indicating an orthogonal code length used for demodulating a reference signal by indicating at least one of:

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

In this embodiment of the present invention, the indicating unit 1901 indicates the pattern, density and/or sequence used by the demodulation reference signal by indicating at least one of the following signaling:

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

In this embodiment of the present invention, the indicating unit 1901 configures multiple demodulation reference signal parameters to the second communication node through a high-level signaling; alternatively, a part of patterns of the demodulation reference signal used by the second communication node is allocated to the second communication node from a predefined plurality of demodulation reference signal patterns through higher layer signaling, and the indicating unit 1901 informs the second communication node of which one of the higher layer signaling the parameter or the pattern of the demodulation reference signal is.

wherein, the root sequences on different sub-bands are different or the same; the root sequences on the same subband for different transmission units are different or the same.

In the embodiment of the present invention, when the preset signaling is used to indicate a cyclic shift sequence used by a demodulation reference signal on a subband in a sending unit, the preset signaling is also used to indicate cyclic shift sequences used by different subbands of the demodulation reference signal on the same sending unit, and/or the same subband of different sending units, and/or different subbands of different sending units;

In this embodiment of the present invention, the instructing unit 1901 instructs, by using the signaling, that the bandwidth used by the second communication node for sending the demodulation reference signal supports multiple division methods according to different subband lengths.

The device for configuring the demodulation reference signal according to the embodiment of the present invention is located at a first communication node, for example, a base station.

It should be understood by those skilled in the art that the functions of the units in the apparatus for configuring a demodulation reference signal shown in fig. 19 can be understood by referring to the related description of the method for configuring a demodulation reference signal. The functions of the units in the apparatus for configuring a demodulation reference signal shown in fig. 19 may be implemented by a program running on a processor, or may be implemented by specific logic circuits.

Fig. 20 is a schematic structural diagram of a second apparatus for configuring demodulation reference signals according to an embodiment of the present invention, and as shown in fig. 20, the apparatus includes:

a determining unit 2001 for determining a parameter for demodulating a reference signal by receiving a preset signaling transmitted from the first communication node; wherein the parameter for demodulating the reference signal comprises at least one of: the demodulation reference signal comprises the types of sequences, time domain positions, patterns, density, orthogonal code lengths, root sequences, cyclic shift sequences and the number of ports.

In this embodiment of the present invention, the determining unit 2001 determines the parameter of the demodulation reference signal through signaling from the first communication node for indicating ACK/NACK feedback delay.

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

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

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

In this embodiment of the present invention, the determining unit 2001 determines the length of the orthogonal code used by the demodulation reference signal through at least one of the following indication signaling from the first communication node:

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

In this embodiment of the present invention, the determining unit 2001 determines the density and/or pattern of the demodulation reference signal through at least one of the following signaling from the first communication node:

In the embodiment of the present invention, the determining unit 2001 receives a signaling indicating that the densities and/or orthogonal code lengths of demodulation reference signals corresponding to different demodulation reference signal groups are different from each other from the first communication node;

wherein, the different demodulation reference signal groups correspond to at least one of: different resource groups, different demodulation reference signal ports, different transmission code words, and different transmission layer numbers.

In this embodiment of the present invention, the determining unit 2001 receives multiple demodulation reference signal parameters configured by the first communication node through a high-level signaling; or a part of patterns of the second communication node are allocated from a plurality of predefined demodulation reference signal patterns through higher layer signaling, and the determining unit 2001 knows which one of the parameters of the demodulation reference signal or the patterns is the higher layer signaling through dynamic signaling from the first communication node.

In this embodiment of the present invention, the determining unit 2001 determines, through signaling from the first communication node, a root sequence used by the demodulation reference signal on a sub-band in a receiving unit, the root sequence used by different sub-bands on the same receiving unit and/or the same sub-band in different receiving units and/or different sub-bands in different receiving units;

In this embodiment of the present invention, the determining unit 2001 determines, through signaling from the first communication node, cyclic shift sequences used by demodulation reference signals on different subbands of the same receiving unit and/or on the same subband of different receiving units and/or on different subbands of different receiving units, where the signaling indicates cyclic shift sequences used by the demodulation reference signals on one subband of one receiving unit;

In this embodiment of the present invention, the determining unit 2001 determines, through signaling from the first communication node, the pattern number used by the demodulation reference signal on one subband in one receiving unit, the pattern number used by 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;

wherein, the pattern serial numbers on different sub-bands are different or the same; wherein, the pattern numbers on the same sub-band of different receiving units are different or the same.

In this embodiment of the present invention, the determining unit 2001 determines the sub-band division method to be used according to the instruction signaling from the first communication node.

The device for configuring the demodulation reference signal according to the embodiment of the present invention is located at a second communication node, for example, a terminal.

It should be understood by those skilled in the art that the functions of the units in the apparatus for configuring a demodulation reference signal shown in fig. 20 can be understood by referring to the related description of the method for configuring a demodulation reference signal. The functions of the units in the apparatus for configuring a demodulation reference signal shown in fig. 20 may be implemented by a program running on a processor, or may be implemented by specific logic circuits.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention 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, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

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

the first communication node indicates parameters used by the demodulation reference signal to the second communication node through signaling;

wherein the parameter for demodulating the reference signal comprises at least one of: time domain position, pattern, density, root sequence, cyclic shift sequence, port number, time domain symbol number and indication information whether to send data at the same time;

and establishing the relation between the value of the positive or negative acknowledgement feedback time delay and the demodulation reference signal pattern or the time domain position.

2. The method of configuring demodulation reference signals according to claim 1, wherein the signaling is used to indicate scheduling resources and time domain locations of demodulation reference signals.

3. The method for configuring demodulation reference signals according to claim 1, wherein the signaling is used for indicating a multiplexing mode of a plurality of ports of the demodulation reference signals on time domain symbols;

wherein, the multiplexing mode refers to code division multiplexing.

4. The method according to claim 1, wherein the first communication node signals that the different demodulation reference signal groups of the second communication node have different corresponding demodulation reference signal densities and/or orthogonal code lengths;

5. The method of claim 1, wherein a bandwidth of demodulation reference signal transmission is divided into a plurality of sub-bands, wherein each sub-band is a complete sequence.

6. The method for configuring demodulation reference signals according to claim 5, wherein the signaling is used for indicating the root sequence of the demodulation reference signal used on one sub-band in one transmission unit, and is also used for indicating the root sequence of the demodulation reference signal used on different sub-bands on the same transmission unit, and/or the same sub-band of different transmission units, and/or different sub-bands of different transmission units;

7. The method for configuring demodulation reference signals according to claim 5, wherein the signaling is used to indicate the cyclic shift sequence used by the demodulation reference signal on one subband in one transmission unit, and is also used to indicate the cyclic shift sequence used by the demodulation reference signal on different subbands in the same transmission unit, and/or the same subband in different transmission units, and/or different subbands in different transmission units;

8. The method of claim 5, wherein the signaling indicates the pattern number of the demodulation reference signal used in one subband in one transmitting unit, and indicates the pattern number of the demodulation reference signal used in a different subband in the same transmitting unit, and/or the same subband in different transmitting units, and/or a different subband in different transmitting units;

9. The method according to claim 5, wherein the first communication node uses the signaling to instruct the second communication node that the bandwidth for sending the demodulation reference signal supports multiple division methods according to different sub-band lengths.

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

the second communication node determines the parameters used for demodulating the reference signal by receiving the signaling sent from the first communication node; wherein the parameter for demodulating the reference signal comprises at least one of: time domain position, pattern, density, root sequence, cyclic shift sequence, port number, time domain symbol number and indication information whether to send data at the same time;

11. The method of configuring a demodulation reference signal according to claim 10, wherein the second communication node indicates the time domain position of the demodulation reference signal by signaling from the first communication node indicating the scheduling resource.

12. The method according to claim 10, wherein the second communication node receives the signaling from the first communication node indicating that the different demodulation reference signal groups have different corresponding demodulation reference signal densities and/or orthogonal code lengths;

13. The method of claim 10, wherein a bandwidth in which the demodulation reference signal is transmitted is divided into a number of sub-bands, and wherein each sub-band is a complete sequence.

14. The method of claim 13, wherein the second communication node determines the root sequence of the demodulation reference signal for different subbands in the same receiving unit and/or for the same subband in different receiving units and/or for different subbands in different receiving units by signaling from the first communication node indicating the root sequence of the demodulation reference signal for a subband in a receiving unit;

15. The method of claim 13, wherein the second communication node determines the cyclic shift sequences used by the demodulation reference signals on different subbands in the same receiving unit, and/or on the same subband in different receiving units, and/or on different subbands in different receiving units, through signaling from the first communication node indicating the cyclic shift sequences used by the demodulation reference signals on a subband in a receiving unit;

16. The method according to claim 13, wherein the second communication node determines the pattern sequence numbers of the demodulation reference signals used in different subbands of the same receiving unit and/or in the same subbands of different receiving units and/or in different subbands of different receiving units by signaling from the first communication node indicating the pattern sequence numbers of the demodulation reference signals used in a subband of a receiving unit;

17. The method of configuring a demodulation reference signal according to claim 13, wherein the second communication node determines the subband division method used according to the indication signaling from the first communication node.

18. An apparatus for configuring a demodulation reference signal, applied to a first communication node, the apparatus comprising:

an indicating unit configured to indicate, to the second communication node through signaling, a parameter used for demodulating the reference signal; wherein the parameter used for demodulating the reference signal comprises at least one of the following parameters: time domain position, pattern, density, root sequence, cyclic shift sequence, number of ports, number of time domain symbols, and indication information whether to transmit simultaneously with data.

19. The apparatus for configuring demodulation reference signals according to claim 18, wherein the signaling is used to indicate scheduling resources and time domain locations of demodulation reference signals.

20. The apparatus for configuring demodulation reference signals according to claim 18, wherein the signaling is used to indicate a multiplexing manner of the multiple ports of the demodulation reference signals on the time domain symbols;

wherein, the multiplexing mode refers to code division multiplexing.

21. The apparatus for configuring demodulation reference signals according to claim 18, wherein the instructing unit instructs, through signaling, that the demodulation reference signals corresponding to the different demodulation reference signal groups of the second communication node have different densities and/or orthogonal code lengths;

22. The apparatus for configuring a demodulation reference signal according to claim 18, wherein the bandwidth for demodulation reference signal transmission can be divided into multiple sub-bands, wherein each sub-band is a complete sequence.

23. The apparatus for configuring demodulation reference signals according to claim 22, wherein the signaling is used to indicate a root sequence used by the demodulation reference signal on a subband in a transmitting unit, and is further used to indicate a root sequence used by the demodulation reference signal on a different subband in the same transmitting unit, and/or the same subband in different transmitting units, and/or a different subband in different transmitting units;

24. The apparatus for configuring demodulation reference signals according to claim 22, wherein the signaling is used to indicate cyclic shift sequences used by the demodulation reference signals on one subband in one transmission unit, and is further used to indicate cyclic shift sequences used by the demodulation reference signals on different subbands in the same transmission unit, and/or the same subband in different transmission units, and/or different subbands in different transmission units;

25. The apparatus for configuring demodulation reference signals according to claim 22, wherein the signaling is used to indicate the pattern number used by the demodulation reference signal on a subband in a transmitting unit, and is further used to indicate the pattern number used by the demodulation reference signal on different subbands in the same transmitting unit, and/or the same subband in different transmitting units, and/or different subbands in different transmitting units;

26. The apparatus according to claim 22, wherein the instructing unit instructs, by using the signaling, the second communication node that the bandwidth for sending the demodulation reference signal supports multiple partition methods according to different subband lengths.

27. An apparatus for configuring a demodulation reference signal for use in a second communication node, the apparatus comprising:

a determining unit configured to determine a parameter for demodulation reference signals by receiving signaling transmitted from a first communication node; wherein the parameter for demodulating the reference signal comprises at least one of: the method comprises the steps of demodulating the type, time domain position, pattern, density, orthogonal code length, root sequence, cyclic shift sequence, port number, time domain symbol number and indication information of whether to send data at the same time or not;

28. The apparatus for configuring a demodulation reference signal according to claim 27, wherein the determining unit indicates the time domain location of the demodulation reference signal by signaling from the first communication node indicating the scheduling resources.

29. The apparatus for configuring demodulation reference signals according to claim 27, wherein the determining unit receives signaling from the first communication node indicating that the density and/or the length of orthogonal codes of the demodulation reference signals corresponding to different demodulation reference signal groups are different;

30. The apparatus for configuring demodulation reference signals according to claim 27, wherein the bandwidth of demodulation reference signal transmission is divided into several sub-bands, wherein each sub-band is a complete sequence.

31. The apparatus for configuring demodulation reference signals according to claim 30, wherein the determining unit determines the root sequences used by the demodulation reference signals on different subbands in the same receiving unit, and/or on the same subband in different receiving units, and/or on different subbands in different receiving units, by signaling from the first communication node indicating the root sequences used by the demodulation reference signals on one subband in one receiving unit;

32. The apparatus for configuring a demodulation reference signal according to claim 30, wherein the determining unit determines the cyclic shift sequences used by the demodulation reference signal on different subbands of the same reception unit, and/or on the same subband of different reception units, and/or on different subbands of different reception units, by signaling from the first communication node indicating the cyclic shift sequences used by the demodulation reference signal on one subband in one reception unit;

33. The apparatus for configuring demodulation reference signals according to claim 30, wherein the determining unit determines the pattern sequence numbers used by the demodulation reference signals on different subbands in the same receiving unit, and/or the same subbands in different receiving units, and/or the different subbands in different receiving units, by signaling from the first communication node indicating the pattern sequence numbers used by the demodulation reference signals on one subband in one receiving unit;

34. The apparatus for configuring a demodulation reference signal according to claim 30, wherein the determining unit determines the sub-band division method used according to indication signaling from the first communication node.

35. A computer storage medium having computer-executable instructions stored therein, the computer-executable instructions configured to perform the method of configuring a demodulation reference signal of any one of claims 1-9.

36. A computer storage medium having computer-executable instructions stored therein, the computer-executable instructions configured to perform the method of configuring a demodulation reference signal of any one of claims 10-17.