CN107689857A - The method of demodulated reference signal and configuration - Google Patents

The method of demodulated reference signal and configuration Download PDF

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Publication number
CN107689857A
CN107689857A CN201610640481.1A CN201610640481A CN107689857A CN 107689857 A CN107689857 A CN 107689857A CN 201610640481 A CN201610640481 A CN 201610640481A CN 107689857 A CN107689857 A CN 107689857A
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mtd
mtr
users
dmrs
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王夏男
孙鹏
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Beijing Xinwei Telecom Technology Inc
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Beijing Xinwei Telecom Technology Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal

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

Abstract

The invention discloses the collocation method of demodulated reference signal and device, this method includes：Base station is defined as multiple users and is assigned with identical resource, wherein, resource is used to transmit the data data in V2X message；Base station is at least one in the following manner multiple user configuration demodulated reference signal DMRS：For the first different deviant of multiple user configurations, using frequency domain OCC code words, extend DMRS transmission bandwidth, wherein, the first deviant be time domain OCC codeword selections foundation.Solve the problems, such as not ensureing in correlation technique caused by the orthogonality between DMRS by the present invention, ensure that DMRS orthogonality to a certain extent.

Description

Method and arrangement for demodulating reference signals
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an arrangement for demodulating a reference signal.
Background
The V2X is a communication technology designed by 3GPP for car networking, and the technology is enhanced based on the D2D technology according to the characteristics of car networking communication.
In D2D, one D2D message is composed of two parts, SA (scheduling information) and data (data information). After the user successfully decodes the SA, the resource position where the associated data is located and information required for decoding the data, such as the SA _ ID, the MCS, a frequency hopping indication and the like, can be obtained through the information in the SA. Wherein the SA _ ID is also called Destination _ Group _ ID, and is used to identify a target reception Group of the D2D message and scrambling of the data message, and also to indicate a Group Hopping (GH), Cyclic Shift (CS), and orthogonal mask (OCC) of a DMRS (demodulation reference signal) used in transmitting data.
In V2X, all communications are in broadcast form, so there is no need to identify the target reception group, and the SA _ ID can be used to identify the ID of the source node that sent the V2X message. However, since the user density of V2X communication scenarios is much larger than D2D, in case there is more V2X traffic and less available communication resources, some users have to be allocated (part of) the same data resources even if scheduled by the base station. Due to the randomness of the SA _ ID, the GH, CS, and OCC configurations and indication schemes using DMRS sequences fixed in the current D2D protocol cannot guarantee good orthogonality among DMRSs indicated by different SA _ IDs, which may reduce the channel estimation performance of the receiving end.
Disclosure of Invention
The invention provides a method and a configuration for demodulating a reference signal, which are used for at least solving the problem caused by the fact that orthogonality among DMRSs cannot be guaranteed in the related art.
According to an aspect of the present invention, there is provided a method for configuring a demodulation reference signal, including:
the base station determines that the same resource is allocated to a plurality of users, wherein the resource is used for transmitting data in a V2X message; the base station configures demodulation reference signals (DMRS) for the plurality of users by at least one of the following modes: configuring different first offset values for the plurality of users, using frequency domain OCC code words, and expanding the transmission bandwidth of the DMRS, wherein the first offset values are the basis for selecting time domain OCC code words.
Further, in the case of the frequency domain OCC code word, the base station configures different second offset values for the plurality of users, where the second offset value is a basis for selecting the frequency domain OCC code word.
Further, the base station selects the time domain OCC codeword using the first offset value; and/or, the base station selects the frequency domain OCC codeword using the second offset value; and/or, the base station selects the time domain OCC codeword using the first offset value and the value of SA _ ID; and/or the base station selects the frequency domain OCC codeword using the second offset value and the value of the SA _ ID.
Further, in the case that the first offset value or the second offset value is 1bit, the OCC codeword satisfies the following condition:
or ,
wherein ,Δ1Is the first offset value or the second offset value.
Further, in the case that the first offset value or the second offset value is 2 bits, the OCC codeword satisfies the following condition:
or ,
wherein ,Δ1Is the first offset value or the second offset value.
Further, when the first offset value or the second offset value is greater than 2 bits, the OCC codeword is correspondingly extended, including but not limited to being obtained in a hadamard matrix generation manner.
Further, the base station expanding the transmission bandwidth of the DMRS to configure the DMRS for the plurality of users comprises: the base station instructs the plurality of users to use different cyclic shifts of the same DMRS sequence when transmitting the DMRS on the transmission bandwidth of the extended DMRS.
Further, the base station: configuring SA _ ID as cell ID to make GH of different users identical;
and configuring different third offset values and fourth offset values for the plurality of users respectively, wherein the third offset values are used for enabling SS patterns of different users to be the same, and the fourth offset values are used for enabling CS of different users to be different, and the SS patterns and the CS are used for calculating different cyclic shifts of the same DMRS sequence.
Further, the base station notifies the user of the DMRS through DCI or high-layer signaling.
Further, still include: and when the user side transmits the data, the DMRS configured by the base station is used, and the data corresponds to the SA to additionally indicate the DMRS related parameters.
According to another aspect of the present invention, there is also provided a device for configuring a demodulation reference signal, located in a base station, including: a determining module, configured to determine that the same resource is allocated to multiple users, where the resource is used for transmitting data in a V2X message; a configuration module, configured to configure demodulation reference signals, DMRS, for the plurality of users by at least one of: configuring different first offset values for the plurality of users, using frequency domain OCC code words, and expanding the transmission bandwidth of the DMRS, wherein the first offset values are the basis for selecting time domain OCC code words.
Further, in the case of the frequency domain OCC codeword, the configuration module configures a second different offset value for the plurality of users, where the second offset value is a basis for selection of the frequency domain OCC codeword.
Further, the configuration module selects the time domain OCC codeword using the first offset value; and/or the configuration module selects the frequency domain OCC codeword using the second offset value; and/or the configuration module selects the time domain OCC codeword using the first offset value and a value of SA _ ID; and/or the configuration module selects the frequency domain OCC codeword using the second offset value and the value of the SA _ ID.
Further, the apparatus includes means for using different cyclic shifts of a same DMRS sequence when the plurality of users are instructed to transmit the DMRS on a transmission bandwidth of an extended DMRS.
Further, the configuration module is to: configuring SA _ ID as cell ID to make GH of different users identical; and configuring different third offset values and fourth offset values for the plurality of users respectively, wherein the third offset values are used for enabling SS patterns of different users to be the same, and the fourth offset values are used for enabling CS of different users to be different, and the SS patterns and the CS are used for calculating different cyclic shifts of the same DMRS sequence.
The invention provides a mode for configuring demodulation reference signals DMRS for a plurality of users, solves the problem caused by the fact that the orthogonality among the DMRSs cannot be ensured in the related technology, and ensures the orthogonality of the DMRSs to a certain extent.
Drawings
Fig. 1 is a flowchart of a method for configuring a demodulation reference signal according to an embodiment of the present invention;
fig. 2 is a block diagram of a configuration apparatus for demodulating a reference signal according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In this embodiment, a method for configuring a demodulation reference signal is provided, and fig. 1 is a flowchart of a method for configuring a demodulation reference signal according to an embodiment of the present invention, as shown in fig. 1, the flowchart includes the following steps:
step S102, the base station determines that the same resource is allocated to a plurality of users, wherein the resource is used for transmitting data in a V2X message;
step S104, the base station configures demodulation reference signals DMRS for a plurality of users by at least one of the following modes: configuring different first offset values for a plurality of users, using frequency domain OCC code words and expanding transmission bandwidth of DMRS, wherein the first offset values are the basis for selecting time domain OCC code words.
Through the steps, the problem caused by the fact that orthogonality among the DMRSs cannot be guaranteed in the related technology is solved, and the orthogonality of the DMRSs is guaranteed to a certain extent.
In an optional embodiment, in the case of the frequency domain OCC code word, the base station configures different second offset values for multiple users, where the second offset value is a basis for selecting the frequency domain OCC code word.
In an optional embodiment, the base station selects the time domain OCC codeword using the first offset value; and/or the base station selects the frequency domain OCC code word by using the second offset value; and/or the base station selects the time domain OCC code word by using the first offset value and the value of the SA _ ID; and/or the base station selects the frequency domain OCC codeword using the second offset value and the value of SA _ ID.
In an optional embodiment, in the case that the first offset value or the second offset value is 1bit, the OCC codeword satisfies the following condition:
or ,
wherein ,Δ1Is the first offset value or the second offset value.
In an optional embodiment, in the case that the first offset value or the second offset value is 2 bits, the OCC codeword satisfies the following condition:
or ,
wherein ,Δ1Is the first offset value or the second offset value.
In an optional embodiment, when the first offset value or the second offset value is greater than 2 bits, the OCC codeword is correspondingly extended, including but not limited to being obtained in a hadamard matrix generation manner.
In an optional embodiment, the configuring, by the base station, the demodulation reference signal DMRS for the plurality of users by expanding the transmission bandwidth of the DMRS includes: the base station instructs multiple users to use different cyclic shifts of the same DMRS sequence when transmitting DMRSs over the transmission bandwidth of the extended DMRS.
In an optional embodiment, the base station configures SA _ ID as cell ID, so that GH of different users are the same; and respectively configuring different third offset values and fourth offset values for the plurality of users, wherein the third offset values are used for enabling SSpattern of different users to be the same, the fourth offset values are used for enabling CS of different users to be different, and the SS pattern and the CS are used for calculating different cyclic shifts of the same DMRS sequence.
In an optional embodiment, the base station notifies the user of the DMRS through DCI or higher layer signaling.
In an optional embodiment, further comprising: and when the user side transmits the data, the DMRS configured by the base station is used, and the data corresponds to the SA to additionally indicate the DMRS related parameters.
In this embodiment, there is also provided a device for configuring a demodulation reference signal, which is located in a base station, and fig. 2 is a block diagram of a structure of the device for configuring a demodulation reference signal according to an embodiment of the present invention, as shown in fig. 2, the device includes: a determining module 22, configured to determine that the same resource is allocated to multiple users, where the resource is used for transmitting data in a V2X message; a configuring module 24, configured to configure a demodulation reference signal DMRS for a plurality of users by at least one of: configuring different first offset values for a plurality of users, using frequency domain OCC code words and expanding transmission bandwidth of DMRS, wherein the first offset values are the basis for selecting time domain OCC code words.
In an alternative embodiment, in the case of a frequency domain OCC code word, the configuration module 24 configures a different second offset value for a plurality of users, where the second offset value is a basis for selection of the frequency domain OCC code word.
In an alternative embodiment, configuration module 24 uses the first offset value to select the time domain OCC codeword; and/or, configuration module 24 selects a frequency domain OCC codeword using the second offset value; and/or, configuration module 24 selects a time domain OCC codeword using the first offset value and the value of SA _ ID; and/or configuration module 24 selects a frequency domain OCC codeword using the second offset value and the value of SA _ ID.
In an optional embodiment, the module 24 is configured to use different cyclic shifts of the same DMRS sequence when multiple users are instructed to transmit DMRSs on the transmission bandwidth of the extended DMRSs.
In an optional embodiment, the configuration module 24 is configured to configure the SA _ ID as a cell ID, so that GH of different users are the same; and respectively configuring different third offset values and fourth offset values for a plurality of users, wherein the third offset values are used for enabling SS patterns of different users to be the same, the fourth offset values are used for enabling CS of different users to be different, and the SS patterns and the CS are used for calculating different cyclic shifts of the same DMRS sequence.
This is described below in connection with an alternative embodiment.
In the embodiment, a DMRS configuration and indication scheme for V2X communication is provided, and when a base station allocates (part of) the same resources for multiple V2X users to transmit data, the users can be configured to use DMRS with good orthogonality, and meanwhile, a transmitting user indicates relevant configuration information in SA, which helps a receiving user to obtain better receiving performance.
Scheme one, DMRS configuration and indication scheme when using time domain OCC
The current D2D protocol provides a DMRS configuration scheme with OCC ═ 2 in the time domain, and the OCC codeword configuration scheme is shown in table 1:
TABLE 1
The selection of OCC code word in the scheme shown in Table 1 depends only on the value of SA _ IDWhen two users areThe same parity will use the same OCC code word and the channels of the two users cannot be distinguished.
The proposed enhanced time domain OCC codeword configuration scheme is shown in table 2:
TABLE 2
wherein ,Δ1A 1bit offset value is configured for the base station to the user through DCI or higher layer signaling (the values configured to different users may be different). For example, when the base station allocates (partially) the same data resource to two users, the two users are respectively configured with their respective Δ1Value such that two users are eachThe difference of parity is satisfied, so that the DMRS symbols can be modulated in time domain by using OCC code words which are orthogonal to each other.
Since one subframe in the V2X system includes 4 DMRSs (2D 2D), a time domain orthogonal scheme with OCC equal to 4 may be used, and a corresponding enhanced time domain OCC codeword configuration scheme is shown in table 3:
TABLE 3
At this time, the indication delta1Requiring 2-bit information, the base station can allocate (part of) the same data resources for at most 4 users and maintain orthogonality among DMRSs of the users.
When a user transmits data by using the DMRS configured by this scheme (scheme 1), Δ needs to be additionally indicated in the corresponding SA1The value of (c).
The OCC code word selection may also be combined withIndependent of only Δ1Regarding, tables 2 and 3 may be changed to tables 4 and 5, respectively:
TABLE 4
TABLE 5
Using the forms of tables 2 and 3 (i.e. using and Δ1Combining OCC codeword selection) or in the form of tables 4 and 5 (i.e., using Δ alone)1OCC codeword selection) for DMRS configuration may be specified in the protocol, and may also be specifiedCan be uniformly configured by a network in an actual system.
Scheme two, DMRS configuration and indication scheme when using frequency domain OCC
The current D2D protocol does not provide an OCC scheme in the frequency domain. To increase the available orthogonal dimensions, frequency domain OCC may be introduced in V2X, i.e. an orthogonal mask of OCC N1 is used on consecutive N1 (even) subcarriers in the frequency domain to distinguish N1 different users.
The same OCC codeword configuration scheme as in table 2 or table 4 may be used, as when N1 is 2, with the offset value represented as Δ2In contrast to the time domain OCC scheme, the base station may configure the value to the user through DCI or higher layer signaling, and may also need to configure the N1 value to the user. This scheme can also be extended to OCC>2 (e.g., when N1 is 4, the same OCC codeword configuration scheme as in table 3 or table 5 may be used).
When a user transmits data using the DMRS configured by this scheme (scheme 2), N1 and Δ are additionally indicated in the corresponding SA2A value of (d); it is also possible to indicate only Δ if the value of N1 is unique in the system and known to all users (e.g., as specified in the protocol or uniformly configured by the network)2The value of (c). Indication of delta2Need to make sure thatbit information.
Use of and Δ2Whether OCC codeword selection is performed in combination or using Δ alone2The DMRS configuration for OCC codeword selection may be defined in a protocol, or may be configured in a network in an actual system.
Scheme two can be used in combination with scheme.
Scheme three, DMRS configuration and indication scheme when extended DMRS transmission bandwidth is used
When a base station allocates data resources for users, if some users are allocated (part of) the same data resources, the base station informs the users to transmit DMRS (data part bandwidth is not changed) on a larger bandwidth through DCI or higher layer signaling, and the bandwidth should contain the data bandwidth used by the users. When these users transmit DMRSs over the same bandwidth, using different cyclic shifts of the same DMRS sequence may provide ideal orthogonality.
The GH and CS configuration schemes for DMRS sequences specified in the current D2D protocol are shown in table 6:
TABLE 6
GH pattern in the scheme shown in Table 6 is represented by(i.e. the) Determining that SS (Sequence Shift) pattern is formed by fssDetermining, GH pattern and SS pattern jointly determine the result of GH, and the selection of CS depends onThe scheme cannot guarantee that different users use different cyclic shifts of the same DMRS sequence, and cannot provide ideal orthogonality.
Enhanced GH and CS configurations are proposed as shown in table 7:
TABLE 7
wherein Is a cell ID; delta3 and Δ4Two offset values configured to the user for the base station through DCI or higher layer signaling (the values configured to different users may be different);is aboutCan use the function specified in the current D2D protocolX represents the maximum number of users that can be distinguished by CS, and the size thereof can be set according to the cell size, and X ═ 8 specified in the current D2D protocol can be used.
In this caseValue usageDifferent users use the same GH pattern (assuming that the users are in the same cell; if the users support multi-cell joint scheduling and the users are in different cells, the cell id of the adjacent cell can be made to correspond to the same GH pattern through reasonable network planning); the base station configures an offset value delta for each user3Making the SSpattern of different users the same; the base station configures an offset value delta for each user4The CS of different users is made different, and finally different users use different cyclic shifts of the same DMRS sequence, providing ideal orthogonality.
When the scheme is used alone, at most X users can be allocated with (part of) the same resources and configured with ideally orthogonal DMRS. If more users need to be allocated with (part of) the same resources, the method can be used in combination with the scheme 1 and the scheme 2; DMRS configuration schemes of current D2D protocols may also be used, but do not provide ideal orthogonality.
When a user transmits data by using the DMRS configured by scheme 3, the data needs to be transmitted by the userIndicating additionally in SA bandwidth and delta used for DMRS transmission3 and Δ4A value of, indicating Δ3Requires 5bit information, indicating delta4Need to make sure thatbit information. If the DMRS configuration scheme of the current D2D protocol can also be selected for use, additional 1bit information is also needed to indicate which configuration scheme is used.
The selection of SS pattern and CS can be combined withIndependent of only Δ3 and Δ4Regarding, table 7 may change to table 8 accordingly:
TABLE 8
Using the form of Table 7 (i.e. using and Δ3、Δ4The combination of SS pattern and CS selection) is also in the form of Table 8 (i.e., Δ used alone)3、Δ4In conjunction with SS pattern and CS selection), DMRS configuration may be specified in a protocol, or may be configured by a network in an actual system.
By the embodiment, when the base station allocates (part of) the same resources to a plurality of users for transmitting data in the V2X message, the users can use orthogonal DMRSs for transmission by using the time domain OCC, and/or the frequency domain OCC and/or the method for extending the DMRS transmission bandwidth. When the time domain OCC or the frequency domain OCC is used, the base station controls different users to use orthogonal OCC code words by configuring the offset value. When the extended DMRS transmission bandwidth is used, GH pattern is determined by the cell ID, and the base station controls different users to use different cyclic shifts of the same DMRS sequence by configuring an offset value. And the base station configures the relevant parameters of the DMRS and informs the user through DCI or high-layer signaling. And when the user transmits the data, the DMRS configuration configured by the base station is used, and relevant parameters are additionally indicated in the SA corresponding to the data.
The DMRS configuration and indication scheme for V2X communication provided by this embodiment has the following advantages:
when the base station allocates (part of) the same resources for multiple users to transmit data in the V2X message, the users can be configured to use orthogonal DMRSs, which improves the channel estimation performance of the receiving end.
DMRS configuration is performed by using the SA ID and the Cell ID, and signaling overhead is reduced.
It should be apparent that the modules or steps of the present invention described above can be implemented by a general-purpose computing device, they can be centralized on a single computing device or distributed over a network of multiple computing devices, and they can be implemented by program code executable by a computing device, so that they can be stored in a storage device and executed by a computing device, or they can be separately manufactured into integrated circuit modules. Thus, the present invention is not limited to any specific combination of hardware and software. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (15)

1. A method for configuring demodulation reference signals, comprising:
the base station determines that the same resource is allocated to a plurality of users, wherein the resource is used for transmitting data in a V2X message;
the base station configures demodulation reference signals (DMRS) for the plurality of users by at least one of the following modes: configuring different first offset values for the plurality of users, using frequency domain OCC code words, and expanding the transmission bandwidth of the DMRS, wherein the first offset values are the basis for selecting time domain OCC code words.
2. The method of claim 1, wherein in the case of the frequency-domain OCC codeword, the base station configures a second offset value for the plurality of users, wherein the second offset value is a basis for selection of the frequency-domain OCC codeword.
3. The method according to claim 1 or 2,
the base station selects the time domain OCC codeword using the first offset value; and/or the presence of a gas in the gas,
the base station selects the frequency domain OCC codeword using the second offset value; and/or the presence of a gas in the gas,
the base station selects the time domain OCC codeword using the first offset value and the value of SA _ ID; and/or the presence of a gas in the gas,
the base station selects the frequency domain OCC codeword using the second offset value and the value of the SA _ ID.
4. The method according to claim 1 or 2,
when the first offset value or the second offset value is 1bit, the OCC code word satisfies the following condition:
or ,
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wherein ,Δ1Is the first offset value or the second offset value.
5. The method according to claim 1 or 2,
when the first offset value or the second offset value is 2 bits, the OCC code word satisfies the following condition:
or ,
<mrow> <mo>&amp;lsqb;</mo> <mtable> <mtr> <mtd> <mrow> <msup> <mi>w</mi> <mi>&amp;lambda;</mi> </msup> <mrow> <mo>(</mo> <mn>0</mn> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <msup> <mi>w</mi> <mi>&amp;lambda;</mi> </msup> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <msup> <mi>w</mi> <mi>&amp;lambda;</mi> </msup> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <msup> <mi>w</mi> <mi>&amp;lambda;</mi> </msup> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> <mo>&amp;rsqb;</mo> <mo>=</mo> <mtable> <mtr> <mtd> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <mrow> <mo>+</mo> <mn>1</mn> </mrow> </mtd> <mtd> <mrow> <mo>+</mo> <mn>1</mn> </mrow> </mtd> <mtd> <mrow> <mo>+</mo> <mn>1</mn> </mrow> </mtd> <mtd> <mrow> <mo>+</mo> <mn>1</mn> </mrow> </mtd> </mtr> </mtable> </mfenced> </mtd> <mtd> <mrow> <msub> <mi>if&amp;Delta;</mi> <mn>1</mn> </msub> <mi>mod</mi> <mn>4</mn> <mo>=</mo> <mn>0</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <mrow> <mo>+</mo> <mn>1</mn> </mrow> </mtd> <mtd> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </mtd> <mtd> <mrow> <mo>+</mo> <mn>1</mn> </mrow> </mtd> <mtd> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </mtd> </mtr> </mtable> </mfenced> </mtd> <mtd> <mrow> <msub> <mi>if&amp;Delta;</mi> <mn>1</mn> </msub> <mi>mod</mi> <mn>4</mn> <mo>=</mo> <mn>1</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <mrow> <mo>+</mo> <mn>1</mn> </mrow> </mtd> <mtd> <mrow> <mo>+</mo> <mn>1</mn> </mrow> </mtd> <mtd> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </mtd> <mtd> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </mtd> </mtr> </mtable> </mfenced> </mtd> <mtd> <mrow> <msub> <mi>if&amp;Delta;</mi> <mn>1</mn> </msub> <mi>mod</mi> <mn>4</mn> <mo>=</mo> <mn>2</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <mrow> <mo>+</mo> <mn>1</mn> </mrow> </mtd> <mtd> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </mtd> <mtd> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </mtd> <mtd> <mrow> <mo>+</mo> <mn>1</mn> </mrow> </mtd> </mtr> </mtable> </mfenced> </mtd> <mtd> <mrow> <msub> <mi>if&amp;Delta;</mi> <mn>1</mn> </msub> <mi>mod</mi> <mn>4</mn> <mo>=</mo> <mn>3</mn> </mrow> </mtd> </mtr> </mtable> <mo>;</mo> </mrow>
wherein ,Δ1Is the first offset value or the second offset value.
6. The method according to claim 1 or 2,
and correspondingly expanding the OCC code word under the condition that the first offset value or the second offset value is larger than 2 bits, including but not limited to obtaining the OCC code word in a Hadamard matrix generation mode.
7. The method of claim 1, wherein the base station expanding the transmission bandwidth of the DMRS to configure a demodulation reference signal (DMRS) for the plurality of users comprises:
the base station instructs the plurality of users to use different cyclic shifts of the same DMRS sequence when transmitting the DMRS on the transmission bandwidth of the extended DMRS.
8. The method of claim 7, wherein the base station:
configuring SA _ ID as cell ID to make GH of different users identical;
and configuring different third offset values and fourth offset values for the plurality of users respectively, wherein the third offset values are used for enabling SS patterns of different users to be the same, the fourth offset values are used for enabling CS of different users to be different, and the SSpatterns and the CS are used for calculating different cyclic shifts of the same DMRS sequence.
9. The method of claim 1, wherein the base station-configured demodulation reference signals (DMRS) are signaled to users through DCI or higher layers.
10. The method of claim 9, further comprising:
and when the user side transmits the data, the DMRS configured by the base station is used, and the data corresponds to the SA to additionally indicate the DMRS related parameters.
11. An apparatus for configuring demodulation reference signals, located in a base station, includes:
a determining module, configured to determine that the same resource is allocated to multiple users, where the resource is used for transmitting data in a V2X message;
a configuration module, configured to configure demodulation reference signals, DMRS, for the plurality of users by at least one of: configuring different first offset values for the plurality of users, using frequency domain OCC code words, and expanding the transmission bandwidth of the DMRS, wherein the first offset values are the basis for selecting time domain OCC code words.
12. The apparatus of claim 11, wherein in the case of the frequency-domain OCC codeword, the configuration module configures a second, different offset value for the plurality of users, wherein the second offset value is a basis for selection of the frequency-domain OCC codeword.
13. The apparatus of claim 11 or 12,
the configuration module selects the time domain OCC codeword using the first offset value; and/or the presence of a gas in the gas,
the configuration module selects the frequency domain OCC codeword using the second offset value; and/or the presence of a gas in the gas,
the configuration module selects the time domain OCC codeword using the first offset value and a value of SA _ ID; and/or the presence of a gas in the gas,
the configuration module selects the frequency domain OCC codeword using the second offset value and the value of the SA _ ID.
14. The apparatus of claim 11, wherein the means for configuring is configured to use different cyclic shifts of a same DMRS sequence when the plurality of users are instructed to transmit the DMRS on a transmission bandwidth of an extended DMRS.
15. The apparatus of claim 14, wherein the configuration module is configured to:
configuring SA _ ID as cell ID to make GH of different users identical;
and configuring different third offset values and fourth offset values for the plurality of users respectively, wherein the third offset values are used for enabling SS patterns of different users to be the same, the fourth offset values are used for enabling CS of different users to be different, and the SSpatterns and the CS are used for calculating different cyclic shifts of the same DMRS sequence.
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