CN113381960B - Method and device for configuring and determining phase tracking reference signal, storage medium, base station and user equipment - Google Patents
Method and device for configuring and determining phase tracking reference signal, storage medium, base station and user equipment Download PDFInfo
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- CN113381960B CN113381960B CN202110820063.1A CN202110820063A CN113381960B CN 113381960 B CN113381960 B CN 113381960B CN 202110820063 A CN202110820063 A CN 202110820063A CN 113381960 B CN113381960 B CN 113381960B
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
Abstract
A method and a device for configuring and determining a phase tracking reference signal, a storage medium, a base station and user equipment are provided, wherein the method for configuring the phase tracking reference signal comprises the following steps: configuring frequency domain densities of phase tracking reference signals corresponding to various bandwidths for user equipment; configuring a preset maximum subcarrier number for the user equipment, wherein the maximum subcarrier number is suitable for at least one frequency domain density and is used for determining the insertion position of a phase tracking reference signal. The technical scheme of the invention can save transmission resources and improve the performance of the PT-RS.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for configuring and determining a phase tracking reference signal, a storage medium, a base station, and a user equipment.
Background
Phase-tracking Reference Signal (PT-RS) is a newly introduced Reference symbol in New Radio (NR) technology, and is used to counter Phase noise due to clock instability in high frequency communication. Since phase noise is equivalent to a time domain multiplicative channel, it is mainly embodied as Common Phase Error (CPE) on an Orthogonal Frequency Division Multiplexing (OFDM) symbol, and can be estimated by PT-RS. Since the CPE does not have frequency selectivity, in principle, only one PT-RS needs to be inserted into one OFDM symbol; however, since the received signal is usually noisy, a certain number of PT-RS subcarriers need to be inserted into one OFDM symbol, and the received signal on these PT-RS subcarriers needs to be averaged to reduce CPE estimation error due to noise.
In the prior art, a fifth Generation mobile communication technology (5th-Generation,5G) supports a frequency-domain distributed PT-RS insertion pattern, and for this purpose, a frequency-domain density of PT-RS is defined, which is the number of PT-RS subcarriers divided by the number of Resource Blocks (RBs) in a bandwidth. A frequency domain density table characterizing the correspondence between bandwidth and frequency domain density is shown in table 1, with different scheduling bandwidths corresponding to different frequency domain densities.
| Bandwidth of | Density in frequency domain |
| N RB <3 | 0 |
| 3<＝N RB <8 | 1 |
| 8<＝N RB <12 | 1/2 |
| 12<＝N RB <16 | 1/3 |
| 16<＝N RB | 1/4 |
TABLE 1
However, the problem with the frequency domain density table in the prior art is that there is a problem that the number of PT-RS subcarriers decreases as the bandwidth increases at the critical bandwidth. E.g. bandwidth N RB ＝7Then, the frequency domain density is 1, and the number of PT-RS subcarriers is 7; when the bandwidth is increased by one RB, the bandwidth N RB After 8, the frequency domain density drops to 1/2, at which point the number of PT-RS subcarriers is instead 4. That is, under the critical bandwidth, a smaller bandwidth corresponds to more PT-RS subcarriers resulting in resource waste, or a larger bandwidth corresponds to less PT-RS subcarriers resulting in performance loss.
Disclosure of Invention
The invention solves the technical problem of how to save transmission resources and improve the performance of the PT-RS.
To solve the foregoing technical problem, an embodiment of the present invention provides a method for configuring a phase tracking reference signal, where the method for configuring a phase tracking reference signal includes: configuring frequency domain density of phase tracking reference signals corresponding to various bandwidths for user equipment; configuring a preset maximum subcarrier number for the user equipment, wherein the maximum subcarrier number is suitable for at least one frequency domain density and is used for determining the insertion position of the phase tracking reference signal.
Optionally, the configuring the preset maximum number of subcarriers for the ue includes: configuring the maximum number of subcarriers corresponding to a current frequency domain density for the user equipment, the maximum number of subcarriers being a minimum of the number of subcarriers in a next adjacent frequency domain density of the current frequency domain density.
Optionally, the maximum number of subcarriers is applicable to all frequency densities.
Optionally, the maximum number of subcarriers is applicable to all frequency domain densities except the minimum non-zero density.
Optionally, the maximum number of subcarriers is applicable to a specified frequency domain density.
Optionally, the method for configuring the phase tracking reference signal further includes: and for the frequency domain density to which the maximum subcarrier number is not applicable, determining the insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth of the user equipment and the frequency domain density corresponding to the scheduling bandwidth.
Optionally, the scheduling bandwidth of the user equipment includes a plurality of scheduling RBs, and the insertion position of the phase tracking reference signal in the scheduling bandwidth is:
Optionally, the method for configuring the phase tracking reference signal further includes: and for the frequency domain density applicable to the maximum subcarrier number, determining the insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth of the user equipment, the frequency domain density corresponding to the scheduling bandwidth and the maximum subcarrier number.
Optionally, the scheduling bandwidth of the user equipment includes a plurality of scheduling RBs, and the insertion position of the phase tracking reference signal in the scheduling bandwidth is:
Optionally, the preset offset is a preset value of 0, or is determined by a demodulation reference signal port associated with the phase tracking reference signal.
Optionally, the maximum number of subcarriers is 4.
The embodiment of the invention also discloses a method for determining the phase tracking reference signal, which comprises the following steps: receiving frequency domain densities of phase tracking reference signals corresponding to various bandwidths configured by a base station; receiving a preset maximum subcarrier number configured by the base station, wherein the maximum subcarrier number is suitable for at least one frequency domain density and is used for determining the insertion position of a phase tracking reference signal.
Optionally, the receiving the preset maximum number of subcarriers configured by the base station includes: receiving the maximum subcarrier number corresponding to the current frequency domain density, which is configured by the base station, wherein the maximum subcarrier number is the minimum value of the subcarrier number in the next adjacent frequency domain density of the current frequency domain density.
Optionally, the maximum number of subcarriers is applicable to all frequency densities.
Optionally, the maximum number of subcarriers is applicable to all frequency domain densities except the minimum non-zero density.
Optionally, the maximum number of subcarriers is applicable to a specified frequency domain density.
Optionally, the method for determining the phase tracking reference signal further includes: and determining the insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth and the frequency domain density corresponding to the scheduling bandwidth for the frequency domain density with the inapplicable maximum subcarrier number so as to obtain the phase tracking reference signal.
Optionally, the scheduled bandwidth includes a plurality of scheduled RBs, and the insertion position of the phase tracking reference signal in the scheduled bandwidth is:
Optionally, the method for determining the phase tracking reference signal further includes: and determining the insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth, the frequency domain density corresponding to the scheduling bandwidth and the maximum subcarrier number for acquiring the phase tracking reference signal.
Optionally, the scheduling bandwidth includes a plurality of scheduling RBs, and the insertion position of the phase tracking reference signal in the scheduling bandwidth is:
Optionally, the preset offset is a preset value of 0, or is determined by a demodulation reference signal port associated with the phase tracking reference signal.
Optionally, the maximum number of subcarriers is 4.
The embodiment of the invention also discloses a configuration device of the phase tracking reference signal, which comprises the following steps: the frequency domain density configuration module is suitable for configuring the frequency domain densities of the phase tracking reference signals corresponding to various bandwidths for the user equipment; a maximum subcarrier number configuration module, adapted to configure a preset maximum subcarrier number for the ue, where the maximum subcarrier number is applicable to at least one frequency domain density, so as to determine an insertion position of the phase tracking reference signal.
The embodiment of the invention also discloses a device for determining the phase tracking reference signal, which comprises the following steps: the frequency domain density receiving module is suitable for receiving the frequency domain densities of the phase tracking reference signals corresponding to various bandwidths configured by the base station; a maximum subcarrier number receiving module, adapted to receive a preset maximum subcarrier number configured by the base station, where the maximum subcarrier number is applicable to at least one frequency domain density, so as to determine an insertion position of a phase tracking reference signal.
The embodiment of the invention also discloses a storage medium, on which computer instructions are stored, and when the computer instructions are executed, the steps of the configuration method of the phase tracking reference signal or the steps of the determination method of the phase tracking reference signal are executed.
The embodiment of the invention also discloses a base station, which comprises a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor, and the processor executes the steps of the configuration method of the phase tracking reference signal when running the computer instructions.
The embodiment of the invention also discloses user equipment, which comprises a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor, and the processor executes the steps of the phase tracking reference signal determination method when running the computer instructions.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
in the technical scheme of the invention, a base station configures frequency domain density of phase tracking reference signals corresponding to various bandwidths for user equipment; and the base station configures a preset maximum subcarrier number for the user equipment, wherein the maximum subcarrier number is suitable for at least one frequency domain density and is used for determining the insertion position of the phase tracking reference signal. According to the technical scheme, the base station configures the maximum subcarrier number suitable for at least one frequency domain density for the user equipment, and the upper limit of the subcarrier number under at least one frequency domain density can be limited, so that the problem that the PT-RS subcarrier number is reduced along with the increase of the bandwidth at the critical bandwidth is avoided, and the PT-RS performance is improved while transmission resources are saved.
Further, the base station configures the maximum number of subcarriers corresponding to the current frequency domain density for the user equipment, where the maximum number of subcarriers is a minimum value of the number of subcarriers in a next adjacent frequency domain density to the current frequency domain density. In the technical scheme of the invention, the specific value of the maximum subcarrier number is determined to be the minimum value of the subcarrier numbers in the next adjacent frequency domain density of the current frequency domain density, so that the phenomenon that the PT-RS subcarrier number at the critical bandwidth position is reduced along with the increase of the bandwidth can be further avoided, and the performance of the PT-RS is further improved.
Further, the maximum number of subcarriers is applicable to all frequency densities; or, the maximum number of subcarriers applies to all frequency domain densities except the minimum non-zero density; or, the maximum number of subcarriers is applicable to a specified frequency domain density. The maximum subcarrier number in the technical scheme of the invention can be suitable for various scenes, and the configuration flexibility of the phase tracking reference signal is realized.
Drawings
Fig. 1 is a flowchart of a method for configuring a phase tracking reference signal according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for determining a phase tracking reference signal according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an apparatus for configuring a phase tracking reference signal according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for determining a phase tracking reference signal according to an embodiment of the present invention.
Detailed Description
As described in the background art, the problem with the frequency domain density table in the prior art is that there is a problem that the number of PT-RS subcarriers decreases as the bandwidth increases at the critical bandwidth. E.g. bandwidth N RB When the frequency domain density is 7, the frequency domain density is 1, and the number of PT-RS subcarriers is 7; when the bandwidth is increased by one RB, the bandwidth N RB After 8, the frequency domain density drops to 1/2, at which point the number of PT-RS subcarriers is instead 4. That is, under the critical bandwidth, a smaller bandwidth corresponds to more PT-RS subcarriers resulting in resource waste, or a larger bandwidth corresponds to less PT-RS subcarriers resulting in performance loss.
According to the technical scheme, the base station configures the maximum subcarrier number suitable for at least one frequency domain density for the user equipment, and the upper limit of the subcarrier number under at least one frequency domain density can be limited, so that the problem that the PT-RS subcarrier number is reduced along with the increase of the bandwidth at the critical bandwidth is avoided, and the PT-RS performance is improved while transmission resources are saved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart of a method for configuring a phase tracking reference signal according to an embodiment of the present invention.
The configuration method of the phase tracking reference signal shown in fig. 1 may be used on the base station side, and the configuration method of the phase tracking reference signal may include the following steps:
step S101: configuring frequency domain densities of phase tracking reference signals corresponding to various bandwidths for user equipment;
step S102: configuring a preset maximum subcarrier number for the user equipment, wherein the maximum subcarrier number is suitable for at least one frequency domain density and is used for determining the insertion position of the phase tracking reference signal.
In a specific implementation of step S101, the base station may configure, for a User Equipment (UE), a plurality of corresponding relationships between bandwidths and frequency-domain densities of Phase-tracking Reference signals (PT-RSs), and specifically, may be a corresponding relationship between a bandwidth range and a frequency-domain density of PT-RSs. Specifically, reference may be made to a frequency domain density table shown in table 1.
In specific application, the corresponding relation between the bandwidth and the frequency domain density of the PT-RS in the frequency domain density table can be adaptively changed and modified. Specifically, the base station may change the configuration critical bandwidth. The critical bandwidth refers to adjacent bandwidth in two adjacent bandwidth ranges. For example, in bandwidth range 3<＝N RB <8 and a bandwidth range 8<＝N RB <12, the bandwidth 7 and the bandwidth 8 are critical bandwidths; in the bandwidth range 8<＝N RB <12 and a bandwidth range 12<＝N RB <In 16, the bandwidth 11 and the bandwidth 12 are critical bandwidths. A frequency domain density table after configuration modification is shown in table 2.
| Bandwidth of | Density in frequency domain |
| N RB <3 | 0 |
| 3<＝N RB <8 | 1 |
| 8<＝N RB <13 | 1/2 |
| 13<＝N RB <16 | 1/3 |
| 16<＝N RB | 1/4 |
TABLE 2
As shown in table 2, the base station may change the frequency domain density of the critical bandwidth 12 from the original 1/3 to 1/2.
Another frequency domain density table after the configuration is changed is shown in table 3.
TABLE 3
As shown in table 3, the base station may configure only 4 frequency domain densities (i.e., 0,1, 1/2, and 1/4) and their corresponding bandwidths.
In the specific implementation of step S102, the base station may further configure a preset maximum number of subcarriers for the ue, so as to determine an insertion position of the phase tracking reference signal, that is, determine a frequency domain pattern of the PT-RS. Specifically, the insertion position of the phase tracking reference signal may be a frequency domain position of a Resource Block (RB).
In an implementation, the maximum number of subcarriers may be applied to at least one frequency domain density. The preset maximum number of subcarriers may be a preset number or may be a number calculated by any other implementable manner. Further, the base station may configure the preset maximum number of subcarriers by Radio Resource Control (RRC) signaling. In other words, the base station may send the UE with the preset maximum number of subcarriers in RRC signaling.
The embodiment of the invention configures the maximum subcarrier number suitable for at least one frequency domain density for the user equipment through the base station, and can limit the upper limit of the subcarrier number under at least one frequency domain density, thereby avoiding the problem that the PT-RS subcarrier number is reduced along with the increase of the bandwidth at the critical bandwidth, and further improving the PT-RS performance while saving transmission resources.
Preferably, the maximum number of subcarriers is 4. Specifically, the too large number of subcarriers of the PT-RS will cause the waste of resources; too small number of sub-carriers of PT-RS will also affect the estimation accuracy of PT-RS. By configuring the maximum number of subcarriers to be 4, the estimation accuracy of the PT-RS can be ensured while resource saving is realized by limiting the number of subcarriers of the PT-RS under at least one frequency domain density.
Preferably, step S102 may include the steps of: configuring the maximum number of subcarriers corresponding to a current frequency domain density for the user equipment, the maximum number of subcarriers being a minimum of the number of subcarriers in a next adjacent frequency domain density of the current frequency domain density.
In this embodiment, the base station may independently configure the maximum number of subcarriers corresponding to the current frequency domain density. The determination method of the maximum number of subcarriers corresponding to the current frequency domain density is as follows: a minimum value of a number of subcarriers in a next adjacent frequency domain density of the current frequency domain density.
Taking the frequency domain density table shown in table 1 as an example, for the current frequency domain density 1, the maximum number of subcarriers corresponding to the current frequency domain density 1 is 4, that is, the minimum value 8/2 of the number of subcarriers in the frequency domain density 1/2 is 4. Thus, critical bandwidth N RB PT-RS subcarrier number of 7 is 4, critical bandwidth N RB The number of the PT-RS sub-carriers of 8 is 4, thereby avoiding the problem that the number of the PT-RS sub-carriers is reduced along with the increase of the bandwidth.
Similarly, for the current frequency-domain density 1/2, the maximum number of subcarriers corresponding to the current frequency-domain density 1/2 is configured to be 4, that is, the minimum value 12/3 of the number of subcarriers in the frequency-domain density 1/3 is 4. Thus, critical bandwidth N RB PT-RS with 11 has subcarrier number of 4 and critical bandwidth N RB The number of the PT-RS subcarriers of 12 is 4, thereby avoiding the problem that the number of PT-RS subcarriers decreases as the bandwidth increases.
In a variation of the embodiment of the present invention, the base station may independently configure the corresponding maximum number of subcarriers for each frequency domain density in all frequency domain densities.
Preferably, the maximum number of subcarriers is applicable to all frequency densities. In this embodiment, the maximum number of subcarriers is limited in all frequency domain densities. That is, for all bandwidths and their corresponding frequency-domain densities, the number of PT-RS subcarriers included in all bandwidths is at most the maximum number of subcarriers. In other words, the maximum number of subcarriers for all frequency densities may be the same.
Alternatively, the maximum number of subcarriers is applicable to all frequency domain densities except the minimum non-zero density. In this embodiment, the bandwidth corresponding to the minimum non-zero density is generally a large bandwidth, for example, as shown in table 1, the bandwidth range corresponding to the minimum non-zero density 1/4 is N RB >The bandwidth may be 50, 100 or more, 16. In this case, if the maximum number of subcarriers corresponding to the minimum non-zero density is limited, it will result in a performance degradation of the PT-RS. Therefore, the maximum number of subcarriers in this embodiment may limit the number of subcarriers for all frequency domain densities except the minimum non-zero density, so as to ensure the performance of the PT-RS.
Alternatively, the maximum number of subcarriers is applicable to a specified frequency domain density. In this embodiment, the maximum number of subcarriers may only limit the number of subcarriers for a specified frequency domain density. For frequency domain densities other than the specified frequency domain density, the maximum number of subcarriers may not be configured, or may be configured separately. Thereby achieving flexibility in configuration of the PT-RS.
The maximum subcarrier number in the embodiment of the invention can be suitable for various scenes, and the configuration flexibility of the phase tracking reference signal is realized.
Preferably, the method for configuring the phase tracking reference signal shown in fig. 1 may further include the steps of: and for the frequency domain density with the inapplicable maximum subcarrier number, determining the insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth of the user equipment and the frequency domain density corresponding to the scheduling bandwidth.
In this embodiment, for frequency domain densities other than the at least one frequency domain density, that is, the frequency domain density for which the maximum number of subcarriers is not applicable, an insertion position of the phase tracking reference signal in the scheduling bandwidth may be determined according to the scheduling bandwidth of the user equipment and the frequency domain density corresponding to the scheduling bandwidth.
Further, the scheduled bandwidth of the user equipment may include a plurality of RBs, and the determined insertion position of the phase tracking reference signal in the scheduled bandwidth is
Wherein n is 0 For a preset offset, 1/N is the frequency domain density corresponding to the scheduling bandwidth, N RB The number of scheduling RBs included in the scheduling bandwidth for the user equipment, {0,1, …, N RB -1 is an index of the plurality of scheduling RBs within the scheduling bandwidth, respectively.
For example, the original index set of the scheduled RBs contained in the scheduled wideband of the user equipment is {10,11,12,13,16,17,20,21,22,23,24,25,26,27,28,29,30,31}, and the number N of scheduled RBs RB And 18, then the index of the plurality of scheduling RBs within the scheduling bandwidth is {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17 }.
Specifically, the insertion position of the PT-RS in the scheduling bandwidth is a set of RBs. Set of RBs
In, subscript n 0 、n 0 +n、…、
May represent an index of an RB in the scheduling bandwidth. And further determining the specific frequency domain position of the RB inserted by the PT-RS in the scheduling bandwidth according to the original index of the RB.
Further, the preset offset is a preset value of 0.
For example, in an embodiment of the present invention, the maximum number of subcarriers is applicable to all frequency domain densities except the minimum non-zero density, and the maximum number of subcarriers is 4. The scheduled wideband of the user equipment contains the original set of indices of RBs as {10,11,12,13,16,17,20,21,22,23,24,25,26,27,28,29,30,31 }. The scheduled broadband comprises 18 RBs in total, and the frequency domain density of the scheduled broadband can be known to be 1/4 by querying a frequency domain density table configured by the base station. Since 1/4 is at a minimum non-zero density, the maximum subcarrier is 4 not applicable. Using subscript calculation formula
The termination index of the set of RBs can be determined as
Then the set of RBs is { RB 0 ，RB 4 ，RB 8 ，RB 12 ，RB 16 }. Thus, in conjunction with the original index set of RBs, it can be determined that the insertion position of PT-RS in the scheduling bandwidth is {10,16,22,26,30} for the original index set of RBs.
Preferably, the method for configuring the phase tracking reference signal shown in fig. 1 may further include the steps of: and determining the insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth of the user equipment, the frequency domain density corresponding to the scheduling bandwidth and the maximum subcarrier number for the frequency domain density suitable for the maximum subcarrier number.
In the embodiment of the present invention, for the frequency domain density applicable to the maximum number of subcarriers, the insertion position of the phase tracking reference signal in the scheduling bandwidth, that is, the frequency domain pattern of the PT-RS, may be determined according to the scheduling bandwidth of the user equipment, the frequency domain density corresponding to the scheduling bandwidth, and the maximum number of subcarriers.
Further, the scheduling bandwidth of the user equipment comprises a plurality of scheduling RBs, and the insertion position of the phase tracking reference signal in the scheduling bandwidth is:
Specifically, the insertion position of the PT-RS in the scheduling bandwidth is a set of RBs. Set of RBs
In, subscript n 0 、n 0 +n、…、
May represent an index of an RB in the scheduling bandwidth. And further determining the specific frequency domain position of the RB inserted by the PT-RS in the scheduling bandwidth according to the original index of the RB.
For example, in an embodiment of the present invention, the maximum number of subcarriers of PT-RS configured by the base station through RRC signaling under different frequency domain densities is 4, which is applicable to all density values except the minimum non-zero density, and n 0 0. The scheduled wideband of the user equipment contains original index set of RBs as 10,11,12,13,16,17,20,21,22,23, and the scheduled wideband contains 10 RBs in total. The frequency domain density of the scheduling broadband can be known as 1/2 by querying the frequency domain density table configured by the base station. Using subscript calculation formula
The termination index of the set of RBs can be determined as
Then the set of RBs is { RB 0 ，RB 2 ，RB 4 ，RB 6 }. Thus, in conjunction with the original index set of RBs, it can be determined that the insertion location of PT-RS in the scheduling bandwidth is RB {10,12,16,20 }.
Further, the preset offset n 0 May also be determined by a Demodulation Reference Signal (DMRS) port associated with the phase tracking Reference Signal. Specifically, the preset offset n 0 May be a DMRS port number associated with the PT-RS; may also be determined by a scrambling sequence of the DMRS port associated with the PT-RS.
Fig. 2 is a flowchart of a method for determining a phase tracking reference signal according to an embodiment of the present invention.
The method for determining the phase tracking reference signal shown in fig. 2 may be used on the user equipment side, and the method for determining the phase tracking reference signal may include the following steps:
step S201: receiving frequency domain densities of phase tracking reference signals corresponding to various bandwidths configured by a base station;
step S202: receiving a preset maximum subcarrier number configured by the base station, wherein the maximum subcarrier number is suitable for at least one frequency domain density and is used for determining the insertion position of a phase tracking reference signal.
In this embodiment, the ue receives the corresponding relationship between the multiple bandwidths configured by the base station and the frequency domain density of the phase tracking reference signal, and the preset maximum number of subcarriers applicable to at least one frequency domain density, so as to avoid the problem that the number of PT-RS subcarriers decreases with the increase of bandwidth when the scheduling bandwidth of the ue is critical bandwidth, thereby saving transmission resources and improving the performance of PT-RS.
Preferably, step S201 may include the steps of: receiving the maximum subcarrier number corresponding to the current frequency domain density, which is configured by the base station, wherein the maximum subcarrier number is the minimum value of the subcarrier number in the next adjacent frequency domain density of the current frequency domain density.
In this embodiment, after determining the insertion position of the phase tracking reference signal, the user equipment may demodulate, in the following step, the phase tracking reference signal according to the RB to which the determined frequency domain position of the RB points.
In the embodiment of the invention, the specific value of the maximum subcarrier number is determined to be the minimum value of the subcarrier number in the next adjacent frequency domain density of the current frequency domain density, so that the phenomenon that the PT-RS subcarrier number at the critical bandwidth position is reduced along with the increase of the bandwidth can be further avoided, and the performance of the PT-RS is further improved.
Further, the maximum number of subcarriers is applicable to all frequency densities; or, the maximum number of subcarriers applies to all frequency domain densities except the minimum non-zero density; or, the maximum number of subcarriers is applicable to a specified frequency domain density. The maximum subcarrier number in the embodiment of the invention can be suitable for various scenes, and the configuration flexibility of the phase tracking reference signal is realized.
Preferably, the method for determining the phase tracking reference signal may further include the steps of: and determining the insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth and the frequency domain density corresponding to the scheduling bandwidth for the frequency domain density with the inapplicable maximum subcarrier number so as to obtain the phase tracking reference signal.
Further, the scheduling bandwidth of the user equipment comprises a plurality of scheduling RBs, and the insertion position of the phase tracking reference signal in the scheduling bandwidth is:
In this embodiment, under the frequency domain density where the maximum number of subcarriers is not applicable, the ue may determine, according to its scheduling bandwidth and the frequency domain density corresponding to the scheduling bandwidth,to determine the insertion position of the phase tracking reference signal in the scheduling bandwidth, i.e. the position of the RB to which the phase tracking reference signal is mapped in the scheduling bandwidth
After receiving the data subsequently, the user equipment may demodulate to obtain the phase tracking reference signal according to the RB pointed by the determined position of the RB.
Preferably, the method for determining the phase tracking reference signal may further include the steps of: and determining the insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth, the frequency domain density corresponding to the scheduling bandwidth and the maximum subcarrier number for acquiring the phase tracking reference signal.
Further, the scheduled bandwidth of the user equipment comprises a plurality of scheduled RBs, and the insertion position of the phase tracking reference signal in the scheduled bandwidth is:
In this embodiment, under the frequency domain density applicable to the maximum number of subcarriers, the ue may determine, according to its scheduling bandwidth, the frequency domain density corresponding to the scheduling bandwidth, and the maximum number of subcarriers, an insertion position of the phase tracking reference signal in the scheduling bandwidth, that is, a position of an RB mapped by the phase tracking reference signal in the scheduling bandwidth
After receiving data subsequently, the user equipment can demodulate the data according to the RB pointed by the determined position of the RB to obtain the phase trackingThe reference signal is tracked.
For more specific implementation of the method for determining the phase tracking reference signal, reference may be made to the description related to the embodiment shown in fig. 1, and details are not repeated here.
Fig. 3 is a schematic structural diagram of an apparatus for configuring a phase tracking reference signal according to an embodiment of the present invention.
The phase tracking reference signal configuration apparatus 30 shown in fig. 3 may be used on the base station side, and the phase tracking reference signal configuration apparatus 30 may include a frequency domain density configuration module 301 and a maximum subcarrier number configuration module 302.
The frequency domain density configuration module 301 is adapted to configure frequency domain densities of phase tracking reference signals corresponding to multiple bandwidths for the user equipment; the maximum subcarrier number configuring module 302 is adapted to configure a preset maximum subcarrier number for the ue, where the maximum subcarrier number is applicable to at least one frequency-domain density, so as to determine an insertion position of a phase tracking reference signal.
The embodiment of the invention can limit the upper limit of the subcarrier number under at least one frequency domain density by configuring the maximum subcarrier number suitable for at least one frequency domain density for the user equipment through the base station, thereby avoiding the problem that the PT-RS subcarrier number is reduced along with the increase of the bandwidth at the critical bandwidth, and further improving the PT-RS performance while saving transmission resources.
Preferably, the maximum subcarrier number configuring module 302 may include a configuring unit 3021 adapted to configure the maximum subcarrier number corresponding to the current frequency-domain density for the user equipment, where the maximum subcarrier number is a minimum value of subcarrier numbers in a next adjacent frequency-domain density of the current frequency-domain density.
In the embodiment of the invention, the specific value of the maximum subcarrier number is determined to be the minimum value of the subcarrier number in the next adjacent frequency domain density of the current frequency domain density, so that the phenomenon that the PT-RS subcarrier number at the critical bandwidth position is reduced along with the increase of the bandwidth can be further avoided, and the performance of the PT-RS is further improved.
Further, the maximum number of subcarriers is applicable to all frequency densities; or, the maximum number of subcarriers applies to all frequency domain densities except the minimum non-zero density; or, the maximum number of subcarriers is applicable to a specified frequency domain density. The maximum subcarrier number in the technical scheme of the invention can be suitable for various scenes, and the configuration flexibility of the phase tracking reference signal is realized
Preferably, the phase tracking reference signal configuring apparatus 30 may further include a first insertion position determining module 303, where the first insertion position determining module 303 is adapted to determine, according to the scheduling bandwidth of the user equipment and the frequency domain density corresponding to the scheduling bandwidth, an insertion position of the phase tracking reference signal in the scheduling bandwidth, for the frequency domain density to which the maximum number of subcarriers is not applicable.
Further, the first insertion position determining module 303 may determine that the insertion position of the phase tracking reference signal in the scheduling bandwidth is:
wherein n is 0 For a preset offset, 1/N is the frequency domain density corresponding to the scheduling bandwidth, N RB For the number of scheduling RBs included in the scheduling bandwidth, {0,1, …, N RB -1 is an index of the plurality of scheduling RBs within the scheduling bandwidth, respectively.
Preferably, the phase tracking reference signal configuring apparatus 30 may further include a second insertion position determining module 304, and the second insertion position determining module 304 is adapted to determine, for the frequency-domain density applicable to the maximum number of subcarriers, an insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth of the user equipment and its corresponding frequency-domain density and the maximum number of subcarriers.
Further, the second insertion position determining module 304 may determine that the insertion position of the phase tracking reference signal in the scheduling bandwidth is:
For more details of the working principle and the working mode of the phase tracking reference signal configuration apparatus 30, reference may be made to the relevant descriptions in fig. 1 to fig. 2, and details are not repeated here.
Fig. 4 is a schematic structural diagram of an apparatus for determining a phase tracking reference signal according to an embodiment of the present invention.
The phase tracking reference signal determining apparatus 40 shown in fig. 4 may be used on the user equipment side, and the phase tracking reference signal determining apparatus 40 may include a frequency domain density receiving module 401 and a maximum subcarrier number receiving module 402.
The frequency domain density receiving module 401 is adapted to receive frequency domain densities of phase tracking reference signals corresponding to multiple bandwidths configured by a base station; the maximum subcarrier number receiving module 402 is adapted to receive a preset maximum subcarrier number configured by the base station, where the maximum subcarrier number is applicable to at least one frequency-domain density for determining an insertion position of a phase tracking reference signal.
In this embodiment, the ue receives the correspondence between the multiple bandwidths configured by the base station and the frequency domain density of the phase tracking reference signal, and the preset maximum number of subcarriers suitable for at least one frequency domain density, so as to avoid the problem that the number of PT-RS subcarriers decreases as the bandwidth increases when the scheduling bandwidth of the ue is a critical bandwidth, thereby saving transmission resources and improving the performance of PT-RS.
Preferably, the maximum subcarrier number receiving module 402 may include a receiving unit 4021, and the receiving unit 4021 is adapted to receive the maximum subcarrier number corresponding to the current frequency-domain density, configured by the base station, where the maximum subcarrier number is the minimum value of the subcarrier numbers in the next adjacent frequency-domain density of the current frequency-domain density.
Further, the maximum number of subcarriers is applicable to all frequency densities; or, the maximum number of subcarriers applies to all frequency domain densities except the minimum non-zero density; or, the maximum number of subcarriers is applicable to a specified frequency domain density. The maximum subcarrier number in the technical scheme of the invention can be suitable for various scenes, and the configuration flexibility of the phase tracking reference signal is realized.
Preferably, the phase tracking reference signal determining apparatus 40 may further include a third insertion position determining module 403, where the third insertion position determining module 403 is adapted to determine, according to the scheduling bandwidth and the frequency domain density corresponding to the scheduling bandwidth, an insertion position of the phase tracking reference signal in the scheduling bandwidth for acquiring the phase tracking reference signal, for the frequency domain density for which the maximum number of subcarriers is not applicable.
Further, the third insertion position determining module 403 may determine that the insertion position of the phase tracking reference signal in the scheduling bandwidth is:
wherein n is 0 For a preset offset, 1/N is the frequency domain density corresponding to the scheduling bandwidth, N RB For the number of scheduled RBs included in the scheduling bandwidth, {0,1, …, N RB -1 is an index of the plurality of scheduling RBs within the scheduling bandwidth, respectively.
Preferably, the phase tracking reference signal determining apparatus 40 may further include a fourth insertion position determining module 404, where the fourth insertion position determining module 404 is adapted to determine, for the frequency domain density applicable to the maximum number of subcarriers, an insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth and the corresponding frequency domain density thereof and the maximum number of subcarriers, so as to obtain the phase tracking reference signal.
Further, the fourth insertion position determining module 404 may determine that the insertion position of the phase tracking reference signal in the scheduling bandwidth is:
For more details of the operation principle and the operation mode of the phase tracking reference signal determining apparatus 40, reference may be made to the related descriptions in fig. 1 to 3, and details thereof are not repeated here
The embodiment of the invention also discloses a storage medium, on which computer instructions are stored, and when the computer instructions are operated, the steps of the method shown in fig. 1 or fig. 2 can be executed. The storage medium may include ROM, RAM, magnetic or optical disks, etc.
The embodiment of the invention also discloses a base station which can comprise a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor. The processor, when executing the computer instructions, may perform the steps of the method shown in fig. 1.
The embodiment of the invention also discloses user equipment which can comprise a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor. The processor, when executing the computer instructions, may perform the steps of the method shown in fig. 2. The user equipment includes but is not limited to a mobile phone, a computer, a tablet computer and other terminal equipment.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (39)
1. A method for configuring a phase tracking reference signal, comprising:
configuring frequency domain density of phase tracking reference signals corresponding to various bandwidths for user equipment;
configuring a preset maximum subcarrier number for the user equipment, wherein the maximum subcarrier number is suitable for at least one frequency domain density and is used for determining the insertion position of a phase tracking reference signal;
and determining the insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth of the user equipment, the frequency domain density corresponding to the scheduling bandwidth and the maximum subcarrier number for the frequency domain density suitable for the maximum subcarrier number.
2. The method according to claim 1, wherein the maximum number of subcarriers is applied to all frequency densities.
3. The method of claim 1, wherein the maximum number of subcarriers is applicable to all frequency domain densities except a minimum non-zero density.
4. The method of claim 1, wherein the maximum number of subcarriers is applied to a specified frequency density.
5. The method of configuring a phase tracking reference signal according to claim 1, further comprising:
and for the frequency domain density with the inapplicable maximum subcarrier number, determining the insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth of the user equipment and the frequency domain density corresponding to the scheduling bandwidth.
6. The method of claim 5, wherein the scheduled bandwidth of the user equipment comprises a plurality of scheduled RBs, and the insertion position of the phase tracking reference signal in the scheduled bandwidth is:
7. The method of claim 1, wherein the scheduled bandwidth of the user equipment comprises a plurality of scheduled RBs, and wherein the insertion position of the phase tracking reference signal in the scheduled bandwidth is:
8. The method according to claim 6 or 7, wherein the preset offset is a preset value of 0 or is determined by a demodulation reference signal port associated with the phase tracking reference signal.
9. The method of claim 1, wherein the maximum number of subcarriers is 4.
10. A method for determining a phase tracking reference signal, comprising:
receiving frequency domain densities of phase tracking reference signals corresponding to various bandwidths configured by a base station;
receiving a preset maximum subcarrier number configured by the base station, wherein the maximum subcarrier number is suitable for at least one frequency domain density and is used for determining the insertion position of a phase tracking reference signal;
and determining the insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth, the frequency domain density corresponding to the scheduling bandwidth and the maximum subcarrier number for the frequency domain density suitable for the maximum subcarrier number so as to acquire the phase tracking reference signal.
11. The method of determining a phase tracking reference signal according to claim 10, wherein said maximum number of subcarriers is applied to all frequency densities.
12. The method of determining a phase tracking reference signal according to claim 10, wherein said maximum number of subcarriers is applicable to all frequency domain densities except a minimum non-zero density.
13. The method for determining the phase tracking reference signal according to claim 10, wherein the maximum number of subcarriers is applied to a specified frequency domain density.
14. The method for determining the phase tracking reference signal according to claim 10, further comprising:
and determining the insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth and the frequency domain density corresponding to the scheduling bandwidth for the frequency domain density with the inapplicable maximum subcarrier number so as to obtain the phase tracking reference signal.
15. The method of determining a phase tracking reference signal according to claim 14, wherein the scheduled bandwidth comprises a plurality of scheduled RBs, and wherein the insertion position of the phase tracking reference signal in the scheduled bandwidth is:
16. The method of determining a phase tracking reference signal according to claim 10, wherein the scheduled bandwidth comprises a plurality of scheduled RBs, and the insertion position of the phase tracking reference signal in the scheduled bandwidth is:
17. The method according to claim 15 or 16, wherein the predetermined offset is a predetermined value 0 or is determined through a demodulation reference signal port associated with the phase tracking reference signal.
18. The method of determining a phase tracking reference signal according to claim 10, wherein said maximum number of subcarriers is 4.
19. An apparatus for configuring a phase tracking reference signal, comprising:
the frequency domain density configuration module is suitable for configuring the frequency domain densities of the phase tracking reference signals corresponding to various bandwidths for the user equipment;
a maximum subcarrier number configuration module, adapted to configure a preset maximum subcarrier number for the ue, where the maximum subcarrier number is applicable to at least one frequency domain density, so as to determine an insertion position of a phase tracking reference signal;
and a second insertion position determining module, adapted to determine, for the frequency domain density applicable to the maximum number of subcarriers, an insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth of the user equipment, the frequency domain density corresponding to the scheduling bandwidth, and the maximum number of subcarriers.
20. The apparatus for configuring a phase tracking reference signal according to claim 19, wherein the maximum number of subcarriers is applicable to all frequency densities.
21. The apparatus for configuring a phase tracking reference signal according to claim 19, wherein said maximum number of subcarriers is applicable to all frequency domain densities except a minimum non-zero density.
22. The apparatus according to claim 19, wherein the maximum number of subcarriers is applied to a specified frequency density.
23. The apparatus for configuring a phase tracking reference signal according to claim 19, further comprising:
and a first insertion position determining module, adapted to determine, for the frequency-domain density for which the maximum number of subcarriers is not applicable, an insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth of the user equipment and the frequency-domain density corresponding thereto.
24. The apparatus for configuring phase tracking reference signal according to claim 23, wherein the scheduled bandwidth of the user equipment comprises a plurality of scheduled RBs, and the insertion position of the phase tracking reference signal in the scheduled bandwidth is:
25. The apparatus for configuring phase tracking reference signal according to claim 19, wherein the scheduled bandwidth of the user equipment comprises a plurality of scheduled RBs, and the insertion position of the phase tracking reference signal in the scheduled bandwidth is:
26. The apparatus for configuring a phase tracking reference signal according to claim 24 or 25, wherein the preset offset is a preset value of 0 or is determined by a demodulation reference signal port associated with the phase tracking reference signal.
27. The apparatus for configuring phase tracking reference signal according to claim 19, wherein the maximum number of subcarriers is 4.
28. An apparatus for determining a phase tracking reference signal, comprising:
the frequency domain density receiving module is suitable for receiving the frequency domain densities of the phase tracking reference signals corresponding to various bandwidths configured by the base station;
a maximum subcarrier number receiving module, adapted to receive a preset maximum subcarrier number configured by the base station, where the maximum subcarrier number is applicable to at least one frequency domain density, so as to determine an insertion position of a phase tracking reference signal;
a fourth insertion position determining module, adapted to determine, for the frequency-domain density applicable to the maximum number of subcarriers, an insertion position of the phase tracking reference signal in the scheduling bandwidth according to a scheduling bandwidth, a frequency-domain density corresponding to the scheduling bandwidth, and the maximum number of subcarriers, so as to obtain the phase tracking reference signal.
29. The apparatus for determining a phase tracking reference signal of claim 28, wherein the maximum number of subcarriers is applicable to all frequency densities.
30. The apparatus for determining a phase tracking reference signal according to claim 28, wherein said maximum number of subcarriers is applicable to all frequency domain densities except a minimum non-zero density.
31. The apparatus for determining a phase tracking reference signal according to claim 28, wherein said maximum number of subcarriers is adapted to a specified frequency domain density.
32. The apparatus for determining a phase tracking reference signal according to claim 28, further comprising:
and a third insertion position determining module, adapted to determine, for the frequency-domain density to which the maximum number of subcarriers is not applicable, an insertion position of the phase tracking reference signal in the scheduling bandwidth according to the scheduling bandwidth and the frequency-domain density corresponding to the scheduling bandwidth, so as to obtain the phase tracking reference signal.
33. The apparatus for determining the phase tracking reference signal of claim 32, wherein the scheduled bandwidth comprises a plurality of scheduled RBs, and wherein the insertion position of the phase tracking reference signal in the scheduled bandwidth is:
34. The apparatus for determining a phase tracking reference signal according to claim 28, wherein the scheduled bandwidth comprises a plurality of scheduled RBs, and the insertion position of the phase tracking reference signal in the scheduled bandwidth is:
35. The apparatus for determining a phase tracking reference signal according to claim 33 or 34, wherein the preset offset is a preset value of 0 or is determined by a demodulation reference signal port associated with the phase tracking reference signal.
36. The apparatus for determining a phase tracking reference signal according to claim 28, wherein said maximum number of subcarriers is 4.
37. A storage medium having stored thereon computer instructions which, when executed, perform the steps of the method for configuring a phase tracking reference signal according to any one of claims 1 to 9 or the steps of the method for determining a phase tracking reference signal according to any one of claims 10 to 18.
38. A base station comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor executes the computer instructions to perform the steps of the method for configuring a phase tracking reference signal according to any one of claims 1 to 9.
39. A user equipment comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor when executing the computer instructions performs the steps of the method for determining a phase tracking reference signal according to any one of claims 10 to 18.
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