CN114422007B - Uplink data modulation method and device - Google Patents
Uplink data modulation method and device Download PDFInfo
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- CN114422007B CN114422007B CN202210296481.XA CN202210296481A CN114422007B CN 114422007 B CN114422007 B CN 114422007B CN 202210296481 A CN202210296481 A CN 202210296481A CN 114422007 B CN114422007 B CN 114422007B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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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
Abstract
The application provides an uplink data modulation method and device, which are applied to a base station. A base station measures an uplink reference signal sent by a target user terminal to obtain a first signal-to-noise ratio for representing the current uplink channel state and a codebook index of a target codebook selected for the target user terminal; determining power offset when a target user terminal uses a target codebook; according to the first signal-to-noise ratio and the determined power offset, a second signal-to-noise ratio when the target user terminal transmits uplink data by using a target codebook is estimated; and sending scheduling information to the target user terminal, wherein the scheduling information comprises a modulation order corresponding to the second signal-to-noise ratio and a codebook index of the target codebook, so that the target user terminal modulates the uplink data transmitted based on the target codebook by adopting a modulation mode represented by the modulation order. By adopting the modulation mode, the uplink data error rate can be effectively reduced, and the purposes of fully utilizing channel resources and improving data flow are achieved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for uplink data modulation.
Background
In a mobile communication system, a base station generally instructs a user terminal to adjust signal transmission parameters, such as a modulation order, the number of transmission layers, a codebook index, and the like, for transmitting uplink data at fixed transmission time intervals, so that relatively stable uplink transmission performance can be obtained under different channel conditions.
The modulation order is usually determined by the base station according to the measured signal-to-noise ratio of the uplink reference signal, and the user terminal is instructed to adjust the modulation order according to the measured bit error rate of the uplink data. For example, when the error rate is high, the user terminal is instructed to reduce the modulation order, that is, a modulation mode with high transmission reliability but relatively low data throughput is selected to reduce the error rate; when the error rate is low, the user terminal is instructed to increase the modulation order, that is, a modulation mode with relatively low transmission reliability but high data throughput is selected to increase the data flow.
The method for adaptively adjusting the modulation order through the error rate is an a posteriori adjustment method, that is, adjustment is performed after real transmission errors occur in uplink data, and the modulation order matching the current channel state may need to be found through multiple adjustments. Obviously, the adjustment efficiency of this adjustment method is not high, and the uplink data transmission quality is still affected to a certain extent, and the radio resources are not fully utilized, so that the overall flow is limited.
Disclosure of Invention
In view of the above, the present application provides an uplink data modulation method and apparatus, so as to quickly and accurately determine a modulation order, and achieve the purposes of fully utilizing radio resources and increasing data traffic.
In order to achieve the purpose of the application, the application provides the following technical scheme:
in a first aspect, the present application provides an uplink data modulation method, which is applied to a base station, and the method includes:
measuring an uplink reference signal sent by a target user terminal to obtain a first signal-to-noise ratio for representing the current uplink channel state and a codebook index of a target codebook selected for the target user terminal;
determining a power offset when the target user terminal uses the target codebook;
according to the first signal-to-noise ratio and the power offset, estimating a second signal-to-noise ratio when the target user terminal transmits uplink data by using the target codebook;
and sending scheduling information to the target user terminal, wherein the scheduling information comprises a modulation order corresponding to the second signal-to-noise ratio and a codebook index of the target codebook, so that the target user terminal modulates the uplink data transmitted based on the target codebook in a modulation mode represented by the modulation order.
Optionally, the determining the power offset when the target user terminal uses the target codebook includes:
acquiring the antenna capacity, the number of supported antenna ports and the number of transmission layers of uplink data of the target user terminal;
inquiring power offset corresponding to the antenna capability, the number of supported antenna ports and the number of transmission layers of the target user terminal from a preset power offset table;
the power offset table is used for recording the corresponding relation among the antenna capability of the user terminal, the number of supported antenna ports, the number of transmission layers and the power offset.
Optionally, the power offset is determined according to a ratio of the number of antenna ports through which the user terminal sends uplink data to the number of antenna ports supported by the user terminal.
Optionally, the number of the antenna ports for sending uplink data is determined according to the number of antenna ports with nonzero power in a codebook matched by the user terminal.
Optionally, the obtaining the antenna capability of the target user terminal includes:
inquiring the number of antenna ports supported by the target user terminal, the number of transmission layers and the antenna capacity corresponding to the codebook index of the target codebook from a preset antenna capacity table;
the antenna capability table is used for recording the corresponding relation between the number of antenna ports supported by the user terminal, the number of transmission layers, the codebook index and the antenna capability.
In a second aspect, the present application provides an uplink data modulation apparatus, which is disposed in a base station, and includes:
the system comprises a measuring unit, a processing unit and a processing unit, wherein the measuring unit is used for measuring an uplink reference signal sent by a target user terminal to obtain a first signal-to-noise ratio for representing the current uplink channel state and a codebook index of a target codebook selected for the target user terminal;
a determining unit, configured to determine a power offset when the target user terminal uses the target codebook;
the estimating unit is configured to estimate a second signal-to-noise ratio when the target user terminal transmits uplink data using the target codebook according to the first signal-to-noise ratio and the power offset;
and a sending unit, configured to send scheduling information to the target user terminal, where the scheduling information includes a modulation order corresponding to the second snr and a codebook index of the target codebook, so that the target user terminal modulates uplink data transmitted based on the target codebook in a modulation manner represented by the modulation order.
Optionally, the determining unit determines the power offset when the target ue uses the target codebook, including:
acquiring the antenna capacity, the number of supported antenna ports and the number of transmission layers of uplink data of the target user terminal;
inquiring power offset corresponding to the antenna capability, the number of supported antenna ports and the number of transmission layers of the target user terminal from a preset power offset table;
the power offset table is used for recording the corresponding relation among the antenna capability of the user terminal, the number of supported antenna ports, the number of transmission layers and the power offset.
Optionally, the power offset is determined according to a ratio of the number of antenna ports through which the user terminal sends uplink data to the number of antenna ports supported by the user terminal.
Optionally, the number of the antenna ports for sending uplink data is determined according to the number of antenna ports with nonzero power in a codebook matched by the user terminal.
Optionally, the obtaining, by the determining unit, the antenna capability of the target user terminal includes:
inquiring the number of antenna ports supported by the target user terminal, the number of transmission layers and the antenna capacity corresponding to the codebook index of the target codebook from a preset antenna capacity table;
the antenna capability table is used for recording the corresponding relation between the number of antenna ports supported by the user terminal, the number of transmission layers, the codebook index and the antenna capability.
It can be seen from the above description that, in the embodiment of the present application, the signal-to-noise ratio measured based on the uplink reference signal is taken as a reference, and the signal-to-noise ratio when the uplink data is transmitted based on the codebook is estimated by combining the power offsets of the user terminals in different codebooks, and the adjusted signal-to-noise ratio can more accurately reflect the uplink channel state when the uplink data is transmitted based on the codebook, so that the modulation order determined based on the adjusted signal-to-noise ratio can more accurately match the uplink channel state when the uplink data is transmitted based on the codebook, thereby achieving the purposes of reducing the error rate of the uplink data, fully utilizing the channel resources, and improving the data flow.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart illustrating an uplink data modulation method according to an embodiment of the present application;
FIG. 2 is a flowchart illustrating an implementation of step 102 according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an uplink data modulation apparatus according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. As used in the embodiments of the present application, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present application to describe various information, the information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, the negotiation information may also be referred to as second information, and similarly, the second information may also be referred to as negotiation information without departing from the scope of the embodiments of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
The base station predicts the signal-to-noise ratio when the user terminal transmits uplink data by using a codebook, and issues a modulation order corresponding to the predicted signal-to-noise ratio to the user terminal, so that the issued modulation order is more matched with the uplink channel state when the user terminal transmits the uplink data based on the codebook, the error rate of the uplink data is reduced, channel resources are fully utilized, and the data flow is improved.
For the purpose of making the objects, aspects and advantages of the present application more apparent, the following detailed description of the present application is made with reference to the accompanying drawings and specific embodiments:
referring to fig. 1, a flowchart of an uplink data modulation method according to an embodiment of the present application is shown, where the flowchart is applied to a base station.
The base station instructs the user terminal to adjust transmission parameters for sending uplink data at transmission time intervals, and the transmission parameters may include a modulation order, a number of transmission layers, and a codebook index.
The modulation order is used for representing a modulation mode. For example, the modulation order 2 is used to represent a Quadrature Phase Shift Keying (QPSK) modulation scheme; the Modulation order 4 is used for representing a 16 Quadrature Amplitude Modulation (QAM) Modulation mode; the modulation order 6 is used for representing a 64QAM modulation mode. The user terminal can modulate the uplink data by adopting a corresponding modulation mode according to the modulation order determined by the base station.
The number of transmission layers is used to characterize the number of data streams. The user terminal can map the uplink data to different layers according to the number of transmission layers determined by the base station, so as to obtain multiple layers (data streams) under the same time-frequency resource.
The codebook index is used to identify the codebook. The user terminal can use the codebook selected by the base station to precode the multilayer data streams under the same time-frequency resource so as to realize the spatial multiplexing between the multiple data streams and the multiple antennas and improve the utilization rate of channel resources.
As shown in fig. 1, the uplink data modulation process according to the embodiment of the present application may include the following steps:
step 101, an uplink reference signal sent by a target user terminal is measured to obtain a first signal-to-noise ratio used for representing a current uplink channel state and a codebook index of a target codebook selected for the target user terminal.
The user terminal can periodically send uplink reference signals, and the base station obtains the signal-to-noise ratio for reflecting the current uplink channel state by measuring the uplink reference signals transmitted by the uplink channel.
Here, a user terminal currently transmitting an uplink reference signal is referred to as a target user terminal; and the signal-to-noise ratio measured by the base station based on the uplink parameter signal is called as a first signal-to-noise ratio. It is to be understood that the first snr, so called target ue, is only named for the convenience of distinction and is not intended to be limiting.
In addition, through the measurement of the uplink reference signal, the base station can also select an optimal codebook matching the current uplink channel state for the target user terminal. Here, the codebook selected by the base station for the target user terminal is referred to as a target codebook. It is to be understood that the reference to a target codebook is merely a name for convenience of distinction and is not intended to be limiting. The process of selecting the codebook can be implemented by using an existing processing method, and is not described herein again.
Step 102, determining a power offset when the target user terminal uses the target codebook.
See the following codebook example:
codebook a =
Codebook B =
Here, it should be noted that each row in the codebook (also referred to as a codebook matrix) corresponds to one transmission antenna (antenna port), and each column corresponds to one layer of data stream. Therefore, it can be known that the codebook a is a codebook example when a four-antenna port single-layer data stream is transmitted; codebook B is an example of a codebook for four-antenna port three-layer data stream transmission.
The codebook A is used for indicating a user terminal to transmit uplink data in a mode of transmitting a single-layer data stream through a first transmitting antenna; the codebook B is used to instruct the ue to transmit uplink data by transmitting one layer of data stream through each of the first, second, and third transmit antennas (in other words, three antennas simultaneously transmit three layers of data streams).
When the user terminal uses one antenna of the four antennas to transmit uplink data based on the codebook a, the transmission power of the user terminal may be 1/4 of the total power; when the user terminal transmits uplink data using three antennas of the four antennas based on the codebook B, the transmission power of the user terminal may be 3/4 of the total power.
It can be seen that, when the user terminal uses different codebooks to transmit uplink data, the transmission power of the user terminal may change.
In uplink data transmission, there is inevitably a codebook change, resulting in a change in the transmission power of the user terminal. If the modulation order is determined based on the signal-to-noise ratio (the first signal-to-noise ratio in step 101) when the uplink reference signal is transmitted, the modulation order cannot be approximately matched with the uplink channel state (the transmission power is different, and the corresponding channel state is different) when the uplink data is transmitted based on the codebook, which results in an increase in the error rate of the uplink data.
Therefore, in the embodiment of the application, before the modulation order is issued to the target user terminal, the power offset generated by the target user terminal by using the target codebook is taken into account in advance, so that the issued modulation order is accurately matched with the uplink channel state when the uplink data is transmitted based on the target codebook, and the problem of the increase of the error rate of the uplink data caused by inaccurate modulation order is solved.
In this step, the process of determining the power offset when the target ue uses the target codebook is described below, and is not repeated here.
And 103, estimating a second signal-to-noise ratio when the target user terminal transmits uplink data by using the target codebook according to the first signal-to-noise ratio and the determined power offset.
Here, the second signal-to-noise ratio is used to characterize an uplink channel state when the uplink data is transmitted using the codebook. It is to be understood that the reference to the second signal to noise ratio is merely a nomenclature for ease of distinction and is not intended to be limiting.
For one embodiment, the second signal-to-noise ratio may be expressed by the following equation:
SINRd=SINRc+Poffsetformula (1)
Wherein, the SINRcA first signal-to-noise ratio determined for the uplink reference signal; poffsetA power offset determined for a codebook; SINRdAnd estimating a second signal-to-noise ratio when the uplink data is transmitted based on the codebook.
And 104, sending scheduling information to the target user terminal, wherein the scheduling information comprises a modulation order corresponding to the second signal-to-noise ratio and a codebook index of the target codebook, so that the target user terminal modulates the uplink data transmitted based on the target codebook in a modulation mode represented by the modulation order.
Namely, the modulation order is determined based on the estimated signal-to-noise ratio when the uplink data is transmitted, so that the modulation order is matched with the uplink channel state when the uplink data is transmitted, and the purpose of reducing the error rate of the uplink data is achieved.
The process of determining the modulation order based on the snr can be implemented by using the prior art, which is not described herein again.
The flow shown in fig. 1 is thus completed.
As can be seen from the process shown in fig. 1, in the embodiment of the present application, the signal-to-noise ratio measured based on the uplink reference signal is used as a reference, and the signal-to-noise ratio when the uplink data is transmitted based on the codebook is estimated by combining power offsets of the user terminals under different codebooks, and the adjusted signal-to-noise ratio can more accurately reflect the uplink channel state when the uplink data is transmitted based on the codebook, so that the modulation order determined based on the adjusted signal-to-noise ratio can also more accurately match the uplink channel state when the uplink data is transmitted based on the codebook, thereby achieving the purposes of reducing the error rate of the uplink data, fully utilizing channel resources, and improving data traffic.
The following describes the procedure for determining the power offset when the target user terminal uses the target codebook in step 102. Referring to fig. 2, a flow of implementing step 102 is shown for the embodiment of the present application.
As shown in fig. 2, the process may include the following steps:
step 201, obtaining the antenna capability of the target user terminal, the number of supported antenna ports, and the number of transmission layers of uplink data.
The antenna capabilities of a user terminal can be divided into: fully coherent, partially coherent, incoherent.
Wherein, the full coherence means that all antennas can transmit multi-layer data stream simultaneously; partial coherence means that partial antennas can transmit multiple layers of data streams simultaneously; noncoherence means that the same data stream can only be transmitted through the same antenna and cannot be transmitted through multiple antennas.
The process of obtaining the antenna capability of the target user terminal in this step is described below, and is not described herein again.
The number of antenna ports supported by the target user terminal can be obtained from the device information reported when the target user terminal is accessed.
The number of transmission layers of the uplink data of the target user terminal may be determined by the base station using an existing implementation manner, which is not described herein again.
Step 202, querying a power offset corresponding to the antenna capability, the number of supported antenna ports, and the number of transmission layers of the target user equipment from a preset power offset table.
The power offset table is used for recording the corresponding relation among the antenna capability of the user terminal, the number of supported antenna ports, the number of transmission layers and the power offset.
Referring to table 1, an example of a power offset table is shown for the embodiment of the present application.
Where NA represents the power bias in the absence of a corresponding condition. For example, there is no situation where two antenna ports transmit three layers of data streams, i.e., there is no corresponding power bias.
As an example, if the number of antenna ports supported by the target user terminal is 4, the antenna capability is incoherent, and the number of transmission layers is three, look up table 1, and obtain the power offset of the target user terminal as-1.23 db.
Here, it should be noted that, in the embodiment of the present application, the power offset may be determined according to a ratio that the number of antenna ports through which the user terminal sends uplink data occupies the number of antenna ports supported by the user terminal.
As an example, it can be expressed by the following formula:
Poffset=10lg (N/M) equation (2)
Wherein, N is the number of antenna ports for transmitting uplink data by the user terminal; m is the number of antenna ports supported by the user terminal; poffsetIs a power bias.
The number of antenna ports for the user terminal to transmit uplink data may be determined according to the number of antenna ports with non-zero power in the codebook matched by the user terminal.
See tables 2-7 for a set of codebooks in different configurations (number of supported antenna ports, number of transmission layers) defined for the R1538.211 protocol.
Taking a codebook set during single-layer transmission of two antenna ports shown in table 2 as an example, the codebook set includes 6 codebooks, and the codebooks are respectively identified by codebook indexes 0 to 5.
Wherein, the codebook identified by codebook index 0 and the codebook identified by codebook index 1 are suitable for a user terminal with incoherent antenna capability, i.e. a single-layer data stream is transmitted through only one antenna port. The number of antenna ports with non-zero power (antenna ports with non-zero element values in the row where the antenna ports are located) in the two codebooks is 1, the total number of the antenna ports is 2, and the power bias of the user terminal using the two codebooks is-3 db by the formula (2). I.e., two antenna ports, non-coherent antenna capability, power bias at single layer transmission-3 db in table 1.
For another example, the codebooks identified by codebook indexes 2 to 5 in table 2 are suitable for a user terminal with full coherent antenna capability, that is, all antenna ports are used to transmit a single-layer data stream. The number of antenna ports with non-zero power in the codebook is 2, the total number of antenna ports is 2, and the power bias of the user terminal using the codebook identified by the codebook indexes 2-5 can be obtained to be 0 through the formula (2). I.e., two antenna ports, full coherent antenna capability, power bias at single layer transmission of 0db in table 1.
For another example, the codebooks identified by codebook indexes 4 to 11 in table 3 are suitable for a user terminal with a partially coherent antenna capability, that is, a single-layer data stream is transmitted by using a portion of antenna ports. The number of antenna ports with nonzero power in the codebook is 2, the total number of the antenna ports is 4, and the power bias of the user terminal using the codebook identified by the codebook indexes 4-11 can be-3 db through the formula (2). I.e., four antenna ports, partially coherent antenna capability, power bias at single layer transmission-3 db in table 1.
Similarly, after the above processing is performed on each codebook in tables 2 to 7, the power offset table shown in table 1 can be obtained.
At this point, the flow shown in fig. 2 is completed.
Through the process shown in fig. 2, the base station may obtain the power offset when the user terminal uses different codebooks.
The following describes a process of acquiring the antenna capability of the target ue by the base station in step 201.
As an embodiment, the base station may directly obtain the antenna capability reported when the target user terminal accesses.
As another embodiment, the base station queries, from a preset antenna capability table, the antenna capabilities corresponding to the number of antenna ports supported by the target user equipment, the number of transmission layers, and the codebook index of the target codebook.
Referring to table 8, an example of an antenna capability table is shown in the embodiment of the present application.
The antenna capability table is used for recording the corresponding relation among the number of antenna ports, the number of transmission layers, codebook indexes and antenna capabilities supported by the user terminal.
The antenna capability table may also be derived from a codebook set defined by the R1538.211 protocol.
For example, table 2 shows a codebook set in single-layer transmission of two antenna ports, where codebooks identified by codebook index 0 and codebook index 1 are suitable for a user terminal with incoherent antenna capability; the codebooks identified by the codebook indexes 2-5 are suitable for the user terminal with the full coherent antenna capability. Thus, the first entry shown in Table 8 is obtained.
Similarly, table 3 shows a codebook set in single-layer transmission of four antenna ports, where codebooks identified by codebook indices 0 to 3 are suitable for a user terminal with incoherent antenna capability; the codebook identified by the codebook index 4-11 is suitable for the user terminal with the capability of a partial coherent antenna; the codebooks identified by the codebook indexes 12-27 are suitable for the user terminal with the full coherent antenna capability. Thus, a second entry shown in Table 8 is obtained.
By analogy, through the analysis of tables 2 to 7, an antenna capability table shown in table 8 for recording the corresponding relationship among the number of antenna ports, the number of transmission layers, the codebook index and the antenna capability can be obtained.
When the base station obtains the codebook index of the target codebook selected for the target user equipment in step 101, it may know that the antenna capability of the target user equipment is fully coherent based on the codebook index (e.g., 4), the number of antenna ports supported by the target user equipment (e.g., 2), and the number of transmission layers (e.g., single layer) in the lookup table 8.
This completes the description of the present embodiment. Through the embodiment, the base station may reversely deduce the antenna capability of the user terminal based on the codebook index selected for the user terminal, so as to query the power offset table (table 2) based on the antenna capability in the following, obtain the power offset of the user terminal, and then complete the uplink data modulation through the process shown in fig. 1.
The method provided by the embodiment of the present application is described above, and the uplink data modulation apparatus provided by the embodiment of the present application is described below:
referring to fig. 3, a schematic structural diagram of an uplink data modulation apparatus provided in the embodiment of the present application is disposed in a base station. The device includes: a measurement unit 301, a determination unit 302, a pre-estimation unit 303 and a transmission unit 304, wherein:
a measurement unit 301, configured to measure an uplink reference signal sent by a target user terminal, to obtain a first signal-to-noise ratio for characterizing a current uplink channel state and a codebook index of a target codebook selected for the target user terminal;
a determining unit 302, configured to determine a power offset when the target user terminal uses the target codebook;
a predicting unit 303, configured to predict, according to the first signal-to-noise ratio and the power offset, a second signal-to-noise ratio when the target user terminal transmits uplink data using the target codebook;
a sending unit 304, configured to send scheduling information to the target user terminal, where the scheduling information includes a modulation order corresponding to the second snr and a codebook index of the target codebook, so that the target user terminal modulates uplink data transmitted based on the target codebook in a modulation manner represented by the modulation order.
As an embodiment, the determining unit 302 determines the power offset when the target user terminal uses the target codebook, including:
acquiring the antenna capacity, the number of supported antenna ports and the number of transmission layers of uplink data of the target user terminal;
inquiring power offset corresponding to the antenna capability, the number of supported antenna ports and the number of transmission layers of the target user terminal from a preset power offset table;
the power offset table is used for recording the corresponding relation among the antenna capability of the user terminal, the number of supported antenna ports, the number of transmission layers and the power offset.
As an embodiment, the power offset is determined according to a ratio of the number of antenna ports through which the user terminal transmits uplink data to the number of antenna ports supported by the user terminal.
As an embodiment, the number of the antenna ports for transmitting uplink data is determined according to the number of antenna ports with non-zero power in a codebook matched by the user terminal.
As an embodiment, the determining unit 302 obtains the antenna capability of the target ue, including:
inquiring the number of antenna ports supported by the target user terminal, the number of transmission layers and the antenna capacity corresponding to the codebook index of the target codebook from a preset antenna capacity table;
the antenna capability table is used for recording the corresponding relation between the number of antenna ports supported by the user terminal, the number of transmission layers, the codebook index and the antenna capability.
The description of the apparatus shown in fig. 3 is thus completed. In the embodiment of the application, the signal-to-noise ratio measured based on the uplink reference signal is taken as a reference, the signal-to-noise ratio when the uplink data is transmitted based on the codebook is estimated by combining the power offset of the user terminal under different codebooks, and the adjusted signal-to-noise ratio can more accurately reflect the uplink channel state when the uplink data is transmitted based on the codebook, so that the modulation order determined based on the adjusted signal-to-noise ratio can more accurately match the uplink channel state when the uplink data is transmitted based on the codebook, thereby achieving the purposes of reducing the error rate of the uplink data, fully utilizing the channel resources and improving the data flow.
The above description is only a preferred embodiment of the present application, and should not be taken as limiting the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present application shall be included in the scope of the present application.
Claims (10)
1. An uplink data modulation method applied to a base station, the method comprising:
measuring an uplink reference signal sent by a target user terminal to obtain a first signal-to-noise ratio for representing the current uplink channel state and a codebook index of a target codebook selected for the target user terminal, wherein the target codebook is an optimal codebook matched with the current uplink channel state;
determining a power offset when the target user terminal uses the target codebook;
according to the first signal-to-noise ratio and the power offset, estimating a second signal-to-noise ratio when the target user terminal transmits uplink data by using the target codebook;
and sending scheduling information to the target user terminal, wherein the scheduling information comprises a modulation order corresponding to the second signal-to-noise ratio and a codebook index of the target codebook, so that the target user terminal modulates uplink data transmitted based on the target codebook in a modulation mode characterized by the modulation order.
2. The method of claim 1, wherein said determining the power offset at which the target user terminal uses the target codebook comprises:
acquiring the antenna capacity, the number of supported antenna ports and the number of transmission layers of uplink data of the target user terminal;
inquiring power offset corresponding to the antenna capability, the number of supported antenna ports and the number of transmission layers of the target user terminal from a preset power offset table;
the power offset table is used for recording the corresponding relation among the antenna capability of the user terminal, the number of supported antenna ports, the number of transmission layers and the power offset.
3. The method of claim 1 or 2, wherein the power offset is determined according to a ratio of the number of antenna ports for transmitting uplink data by the user terminal to the number of antenna ports supported by the user terminal.
4. The method of claim 3, wherein the number of antenna ports for transmitting uplink data is determined according to the number of antenna ports with non-zero power in a codebook matched by the user terminal.
5. The method of claim 2, wherein the obtaining the antenna capability of the target user terminal comprises:
inquiring the number of antenna ports supported by the target user terminal, the number of transmission layers and the antenna capacity corresponding to the codebook index of the target codebook from a preset antenna capacity table;
the antenna capability table is used for recording the corresponding relation between the number of antenna ports supported by the user terminal, the number of transmission layers, the codebook index and the antenna capability.
6. An uplink data modulation apparatus, provided in a base station, the apparatus comprising:
the system comprises a measuring unit, a processing unit and a processing unit, wherein the measuring unit is used for measuring an uplink reference signal sent by a target user terminal to obtain a first signal-to-noise ratio for representing the current uplink channel state and a codebook index of a target codebook selected for the target user terminal, and the target codebook is an optimal codebook matched with the current uplink channel state;
a determining unit, configured to determine a power offset when the target user terminal uses the target codebook;
the estimating unit is configured to estimate a second signal-to-noise ratio when the target user terminal transmits uplink data using the target codebook according to the first signal-to-noise ratio and the power offset;
and a sending unit, configured to send scheduling information to the target user terminal, where the scheduling information includes a modulation order corresponding to the second snr and a codebook index of the target codebook, so that the target user terminal modulates uplink data transmitted based on the target codebook in a modulation manner represented by the modulation order.
7. The apparatus of claim 6, wherein the determining unit determines the power offset for the target user terminal when using the target codebook comprises:
acquiring the antenna capacity, the number of supported antenna ports and the number of transmission layers of uplink data of the target user terminal;
inquiring power offset corresponding to the antenna capability, the number of supported antenna ports and the number of transmission layers of the target user terminal from a preset power offset table;
the power offset table is used for recording the corresponding relation among the antenna capability of the user terminal, the number of supported antenna ports, the number of transmission layers and the power offset.
8. The apparatus of claim 6 or 7, wherein the power offset is determined according to a ratio of the number of antenna ports for the user terminal to transmit uplink data to the number of antenna ports supported by the user terminal.
9. The apparatus of claim 8, wherein the number of antenna ports for transmitting uplink data is determined according to the number of antenna ports with non-zero power in a codebook matched by the ue.
10. The apparatus as claimed in claim 7, wherein said determining unit obtains the antenna capability of the target ue, comprising:
inquiring the number of antenna ports supported by the target user terminal, the number of transmission layers and the antenna capacity corresponding to the codebook index of the target codebook from a preset antenna capacity table;
the antenna capability table is used for recording the corresponding relation between the number of antenna ports supported by the user terminal, the number of transmission layers, the codebook index and the antenna capability.
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