CN112398618A

CN112398618A - Sending method, receiving method, terminal and network equipment of sounding reference signal

Info

Publication number: CN112398618A
Application number: CN201910758987.6A
Authority: CN
Inventors: 胡丽洁; 王飞; 徐晓东; 王启星
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2021-02-23
Anticipated expiration: 2039-08-16
Also published as: CN112398618B; WO2021031777A1

Abstract

A sending method, a receiving method, a terminal and a network device of a sounding reference signal are provided, the method comprises: a terminal receives first configuration information of SRS resources sent by a network, wherein the first configuration information comprises a first symbol interval between repeated symbols in the SRS resources; the terminal determines a mapping mode of the SRS resource in a time slot according to the first symbol interval; and the terminal sends the SRS to the network according to the mapping mode of the SRS resource in the time slot. The embodiment of the invention introduces the symbol interval between the SRS symbols which are repeatedly transmitted, and provides support for realizing more accurate uplink frequency offset estimation based on the SRS.

Description

Sending method, receiving method, terminal and network equipment of sounding reference signal

Technical Field

The invention relates to the technical field of mobile communication, in particular to a sending method, a receiving method, a terminal and network equipment of a sounding reference signal.

Background

In a scenario where a terminal (e.g., UE) moves fast (e.g., high-speed rail), in order to avoid frequent handover of the terminal, a coverage area may be enlarged by Remote Radio Head (RRH) in a Remote manner. Taking a high-speed rail as an example, a plurality of RRHs belonging to the same cell are deployed along a high-speed rail, the RRHs simultaneously transmit data to a terminal, usually, the data can be transmitted in a Single Frequency Network (SFN), the data transmitted by each RRH are completely the same and arrive at the terminal after experiencing different multipath, and the terminal performs channel estimation, equalization, demodulation and decoding on the multipath data to transmit the data and judges whether the data is received correctly. In the above receiving process, it is difficult for the terminal to distinguish which RRH each path comes from.

As shown in FIG. 1, a network coverage scenario is shown for RRHs 1-3 deployed along a high-speed rail. When a train runs to the middle of two RRH sites, the same data sent by the two RRHs closest to each other usually experience frequency offsets with similar magnitude and opposite polarities when arriving at the terminal on the train. In addition, because the signal strengths of the two RRHs are close, the used pilot frequencies are completely the same, the terminal is difficult to perform effective frequency offset estimation and compensation, so that the channel estimation performance is poor, and the decoding accuracy probability is greatly reduced.

In order to solve the above problems in the existing network, a method of RRH estimating uplink frequency offset is adopted, and frequency offset pre-compensation is performed before data is sent. As shown in fig. 1, RRH1 estimates the uplink frequency offset of the terminal to be negative frequency offset, and then performs pre-compensation of reverse frequency offset, i.e. adding a positive frequency offset, before performing downlink transmission. Thus, when the signal experiences a negative frequency offset to the terminal, the frequency offset will be partially or fully cancelled. And the RRH2 also performs similar frequency offset precompensation operation, so that the frequency offsets in the positive and negative directions are very small when the signal reaches the terminal, and the purpose of improving the demodulation performance is achieved.

The existing network usually estimates an uplink frequency offset based on a Demodulation Reference Signal (DMRS) of an uplink traffic channel to perform uplink frequency offset pre-compensation. However, DMRS depends on the transmission of an uplink traffic channel, and only when there is uplink traffic channel scheduling, there is a corresponding DMRS to transmit.

Disclosure of Invention

At least one embodiment of the present invention provides a sending method, a receiving method, a terminal and a network device for sounding reference signals SRS, wherein a symbol interval is introduced between SRS symbols which are repeatedly sent, so as to provide support for implementing more accurate uplink frequency offset estimation based on SRS.

According to an aspect of the present invention, at least one embodiment provides a method for sending a sounding reference signal SRS, which is applied to a terminal and includes:

receiving first configuration information of SRS resources sent by a network, wherein the first configuration information comprises a first symbol interval between repeated symbols in the SRS resources;

determining a mapping mode of the SRS resource in a time slot according to the first symbol interval;

and sending the SRS to the network according to the mapping mode of the SRS resource in the time slot.

Optionally, when the SRS resource configures frequency hopping within a timeslot, the first configuration information further includes: a second symbol interval between starting symbols on two adjacent frequency-domain resources;

the step of determining a mapping manner of the SRS resource in a slot according to the first symbol interval includes:

determining the time domain position of the starting symbol mapped by the SRS resource on the frequency hopping resource of each hop according to the second symbol interval;

and determining the time domain positions of other symbols mapped on the frequency hopping resources of each hop by the SRS resources according to the starting symbol mapped on the frequency hopping resources of each hop by the SRS resources and the first symbol interval.

Optionally, a subcarrier spacing of adjacent resource elements REs in the SRS resource in a frequency domain is a predefined value, or the first configuration information further includes: a subcarrier spacing of adjacent Resource Elements (REs) in the SRS resource in a frequency domain;

the step of determining a mapping manner of the SRS resource in a slot according to the first symbol interval further includes:

and determining the frequency domain position of at least one symbol mapped by the SRS resource according to the subcarrier interval.

Optionally, the first symbol interval is an integer greater than 1, and/or the subcarrier interval is an integer greater than 4.

The embodiment of the invention also provides a method for receiving the Sounding Reference Signal (SRS), which is applied to network equipment and comprises the following steps:

sending first configuration information of SRS resources to a terminal, wherein the first configuration information comprises a first symbol interval between repeated symbols in the SRS resources;

and receiving the SRS sent by the terminal according to the mapping mode of the SRS resource in the time slot.

Optionally, after the step of receiving the SRS sent by the terminal, the method further includes:

and performing uplink frequency offset estimation according to the received repeated symbols of the SRS.

An embodiment of the present invention further provides a terminal, which is characterized by including:

a receiving module, configured to receive first configuration information of an SRS resource sent by a network, where the first configuration information includes a first symbol interval between repeated symbols in the SRS resource;

a mapping determining module, configured to determine, according to the first symbol interval, a mapping manner of the SRS resource in a slot;

and the sending module is used for sending the SRS to the network according to the mapping mode of the SRS resource in the time slot.

the mapping determining module is further configured to determine, according to the second symbol interval, a time domain position of a starting symbol mapped by the SRS resource on the hopping frequency resource of each hop; and determining the time domain positions of other symbols mapped on the frequency hopping resources of each hop by the SRS resources according to the starting symbol mapped on the frequency hopping resources of each hop by the SRS resources and the first symbol interval.

the mapping determining module is further configured to determine a frequency domain position of at least one symbol mapped by the SRS resource according to the subcarrier spacing.

An embodiment of the present invention further provides a terminal, which includes a transceiver and a processor, wherein,

the transceiver is configured to receive first configuration information of an SRS resource sent by a network, where the first configuration information includes a first symbol interval between repeated symbols in the SRS resource;

the processor is configured to determine a mapping manner of the SRS resource in a slot according to the first symbol interval;

the transceiver is further configured to send an SRS to a network according to a mapping manner of the SRS resource in a time slot.

the processor is further configured to determine, according to the second symbol interval, a time domain position of a starting symbol mapped by the SRS resource on a frequency hopping resource of each hop; and determining the time domain positions of other symbols mapped on the frequency hopping resources of each hop by the SRS resources according to the starting symbol mapped on the frequency hopping resources of each hop by the SRS resources and the first symbol interval.

the processor is further configured to determine a frequency domain position of at least one symbol mapped by the SRS resource according to the subcarrier spacing.

An embodiment of the present invention further provides a terminal, which is characterized by including: a processor, a memory and a program stored on the memory and executable on the processor, the program, when executed by the processor, implementing the steps of the method for transmitting sounding reference signals, SRSs, as described above.

An embodiment of the present invention further provides a network device, which is characterized by including:

a sending module, configured to send first configuration information of an SRS resource to a terminal, where the first configuration information includes a first symbol interval between repeated symbols in the SRS resource;

a mapping determining module, configured to determine, by the network device, a mapping manner of the SRS resource in a slot according to the first symbol interval;

and the receiving module is used for receiving the SRS sent by the terminal according to the mapping mode of the SRS resource in the time slot.

Optionally, the network device further includes:

and the frequency offset estimation unit is used for performing uplink frequency offset estimation according to the received repeated symbols of the SRS after receiving the SRS sent by the terminal.

An embodiment of the present invention further provides a network device, which includes a transceiver and a processor, wherein,

the transceiver is configured to transmit first configuration information of an SRS resource to a terminal, where the first configuration information includes a first symbol interval between repeated symbols in the SRS resource;

the processor is configured to determine, by the network device, a mapping manner of the SRS resource in a slot according to the first symbol interval;

the transceiver is further configured to receive, according to a mapping manner of the SRS resource in a time slot, the SRS sent by the terminal.

Optionally, the processor is further configured to perform uplink frequency offset estimation according to the received SRS repeated symbol after receiving the SRS sent by the terminal.

An embodiment of the present invention further provides a network device, which is characterized by including: a processor, a memory and a program stored on the memory and executable on the processor, the program, when executed by the processor, implementing the steps of the method for receiving sounding reference signals, SRS, as described above.

According to another aspect of the invention, at least one embodiment provides a computer readable storage medium having a program stored thereon, which when executed by a processor, performs the steps of the method as described above.

Compared with the prior art, the sending method, the receiving method, the terminal and the network device for the sounding reference signal provided by the embodiment of the invention introduce the symbol interval between the SRS symbols which are repeatedly sent, thereby providing support for uplink frequency offset estimation based on the SRS. In addition, in the embodiment of the present invention, the network side device may further perform uplink frequency offset estimation based on a symbol having a first symbol interval in the SRS sent by the terminal, so that accuracy of uplink frequency offset estimation based on the SRS is improved.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic diagram of a network coverage scenario of RRHs deployed along a high-speed rail in the prior art;

FIG. 2 is a schematic diagram of an application scenario according to an embodiment of the present invention;

fig. 3 is a flowchart of a method for sending a sounding reference signal according to an embodiment of the present invention;

FIGS. 4-7 are several exemplary diagrams of SRS mapping provided by embodiments of the present invention;

fig. 8 is a flowchart of a method for receiving a sounding reference signal according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a network device according to an embodiment of the present invention;

fig. 12 is another schematic structural diagram of a network device according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. In the description and in the claims "and/or" means at least one of the connected objects.

The techniques described herein are not limited to NR systems and Long Time Evolution (LTE)/LTE Evolution (LTE-a) systems, and may also be used for various wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single carrier Frequency Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" are often used interchangeably. CDMA systems may implement Radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA), and so on. UTRA includes Wideband CDMA (Wideband Code Division Multiple Access, WCDMA) and other CDMA variants. TDMA systems may implement radio technologies such as Global System for Mobile communications (GSM). The OFDMA system may implement radio technologies such as Ultra Mobile Broadband (UMB), evolved-UTRA (E-UTRA), IEEE 802.21(Wi-Fi), IEEE802.16(WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are parts of the Universal Mobile Telecommunications System (UMTS). LTE and higher LTE (e.g., LTE-A) are new UMTS releases that use E-UTRA. UTRA, E-UTRA, UMTS, LTE-A, and GSM are described in documents from an organization named "third Generation Partnership Project" (3 GPP). CDMA2000 and UMB are described in documents from an organization named "third generation partnership project 2" (3GPP 2). The techniques described herein may be used for both the above-mentioned systems and radio technologies, as well as for other systems and radio technologies. However, the following description describes the NR system for purposes of example, and NR terminology is used in much of the description below, although the techniques may also be applied to applications other than NR system applications.

The following description provides examples and does not limit the scope, applicability, or configuration set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the spirit and scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

Referring to fig. 2, fig. 2 is a block diagram of a wireless communication system to which an embodiment of the present invention is applicable. The wireless communication system includes a terminal 21 and a network device 22. The terminal 21 may also be referred to as a User terminal or a User Equipment (UE), where the terminal 21 may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or a vehicle-mounted Device, and the specific type of the terminal 21 is not limited in the embodiment of the present invention. The network device 22 may be an RRH, a Base Station or a core network element, wherein the Base Station may be a 5G or later-version Base Station (e.g., a gNB, a 5G NR NB, etc.), or a Base Station in other communication systems (e.g., an eNB, a WLAN access point, or other access points, etc.), wherein the Base Station may be referred to as a node B, an evolved node B, an access point, a Base Transceiver Station (BTS), a radio Base Station, a radio Transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a node B, an evolved node B (eNB), a home node B, a home evolved node B, a WLAN access point, a WiFi node, an RRH, or some other suitable terminology in the field, as long as the same technical effect is achieved, the Base Station is not limited to a specific technical vocabulary, it should be noted that in the embodiment of the present invention only uses the Base Station in the NR system as an example, but does not limit the specific type of base station.

The base stations may communicate with the terminals 21 under the control of a base station controller, which may be part of the core network or some of the base stations in various examples. Some base stations may communicate control information or user data with the core network through a backhaul. In some examples, some of the base stations may communicate with each other, directly or indirectly, over backhaul links, which may be wired or wireless communication links. A wireless communication system may support operation on multiple carriers (waveform signals of different frequencies). A multi-carrier transmitter can transmit modulated signals on the multiple carriers simultaneously. For example, each communication link may be a multi-carrier signal modulated according to various radio technologies. Each modulated signal may be transmitted on a different carrier and may carry control information (e.g., reference signals, control channels, etc.), overhead information, data, and so on.

The base stations may communicate wirelessly with the terminals 21 via one or more access point antennas. Each base station may provide communication coverage for a respective coverage area. The coverage area of an access point may be divided into sectors that form only a portion of the coverage area. A wireless communication system may include different types of base stations (e.g., macro, micro, or pico base stations). The base stations may also utilize different radio technologies, such as cellular or WLAN radio access technologies. The base stations may be associated with the same or different access networks or operator deployments. The coverage areas of different base stations (including coverage areas of base stations of the same or different types, coverage areas utilizing the same or different radio technologies, or coverage areas belonging to the same or different access networks) may overlap.

The communication links in a wireless communication system may comprise an Uplink for carrying Uplink (UL) transmissions (e.g., from terminal 21 to network device 22) or a Downlink for carrying Downlink (DL) transmissions (e.g., from network device 22 to terminal 21). The UL transmission may also be referred to as reverse link transmission, while the DL transmission may also be referred to as forward link transmission. Downlink transmissions may be made using licensed frequency bands, unlicensed frequency bands, or both. Similarly, uplink transmissions may be made using licensed frequency bands, unlicensed frequency bands, or both.

As described in the background art, uplink frequency offset estimation in a high-speed rail scenario, for example, depends on a DMRS of an uplink traffic channel, and the DMRS is transmitted only in the presence of uplink traffic channel scheduling, so that it is difficult to achieve stable and reliable uplink frequency offset estimation based on the DMRS.

Considering that the uplink frequency offset estimation by using DMRS is limited to the scheduling of uplink services, a terminal generally needs to send Sounding Reference Signals (SRS) to perform uplink channel Sounding all the time, so that repeated sending of SRS provides a better way to perform uplink channel estimation.

For example, when a New Radio (NR) system is designed, in order to support coverage enhancement of an SRS, SRS retransmission is introduced, for example, the number of SRS retransmission times R may be configured to be 2 or 4 by a network. The number Ns of symbols of the SRS may be allocated. Wherein:

when frequency hopping is not on, for example, R ═ Ns, then in one slot (slot), each SRS port (port) uses the same subcarrier transmission on all Ns symbols;

when the frequency hopping is turned on, for example, R is 2, Ns is 4, in this case, the first 2 symbols are repeatedly transmitted, and the last 2 symbols are repeatedly transmitted after frequency hopping. Wherein the repeatedly transmitted symbols are consecutive.

From the above description, it can be seen that in the prior art, the symbols for repeatedly transmitting R SRS are continuously transmitted regardless of whether the frequency hopping in the slot is turned on. That is, in the prior art, repeated SRS transmission is usually performed by using adjacent OFDM symbols, which easily results in the accuracy of frequency offset estimation being affected. On the other hand, considering that the number of users is large in a scene such as a high-speed rail, the channel capacity of the SRS needs to be increased.

In order to solve at least one of the above problems, the embodiments of the present invention improve SRS transmission, introduce a symbol interval between repeatedly transmitted SRS symbols, and provide support for implementing more accurate uplink frequency offset estimation based on SRS. In addition, in the embodiment of the present invention, the network side device may also perform uplink frequency offset estimation based on a symbol having a first symbol interval in the SRS sent by the terminal, so that the accuracy of uplink frequency offset estimation based on the SRS is improved.

Referring to fig. 3, a sending method for SRS according to an embodiment of the present invention, when applied to a terminal side, includes:

step 31, the terminal receives first configuration information of the SRS resource sent by the network, where the first configuration information includes a first symbol interval between repeated symbols in the SRS resource.

Here, in the embodiment of the present invention, the first symbol interval between SRS symbols repeatedly transmitted by the terminal is configured by the first configuration information. In the embodiment of the present invention, the symbol interval refers to an interval between two symbols, and the interval is expressed by taking a symbol as a unit. For example, a symbol interval between two symbols is 0, which means that the time domain positions of the two symbols are the same; the symbol interval between two symbols is 1, which indicates that the time domain positions of the two symbols are adjacent; for another example, a symbol interval between two symbols is 2, which means that the two symbols are not adjacent to each other in time domain position and one other symbol exists between the two symbols. Specifically, the first symbol interval may be an integer greater than or equal to 1, that is, at least 1 symbol is separated between adjacent SRS symbols that are repeatedly transmitted. Accordingly, the first symbol interval of the embodiment of the present invention is an integer greater than 1.

Fig. 4 shows a schematic spacing diagram of repeatedly transmitted SRS symbols, where each rectangle filled with a pattern in fig. 4 represents one SRS symbol, the left side of fig. 4 is an example of two repeatedly transmitted SRS symbols in the prior art, that is, the repeatedly transmitted SRS symbols are continuous, and the right side of fig. 4 is a schematic diagram of two repeatedly transmitted SRS symbols improved by the embodiment of the present invention, it can be seen that the symbol spacing between two SRS symbols is 2, and there is one other symbol between the two SRS symbols.

For example, when the number of repeatedly transmitted symbols is 2, the first symbol interval is 2 to 5 symbols. It is assumed here that the SRS configures 6 symbols at most, wherein when 6 symbols are configured, the symbol interval of the first SRS symbol and the second SRS symbol is 5 symbols at most.

And step 32, the terminal determines the mapping mode of the SRS resource in the time slot according to the first symbol interval.

Here, the terminal determines a mapping manner of the SRS resource in the slot according to the first symbol interval, for example, determines at least one symbol mapped by the SRS resource in the slot, so as to determine a symbol position mapped by the SRS resource in a time domain.

And step 33, the terminal sends the SRS to the network according to the mapping mode of the SRS resource in the time slot.

Here, the terminal may perform SRS symbol according to a mapping manner of SRS resources on the slot, for example, a mapped symbol, in this case, the SRS transmitted by the terminal includes repeatedly transmitted SRS symbols, and at least one symbol is separated between adjacent repeatedly transmitted SRS symbols.

Through the steps, the embodiment of the invention introduces the symbol interval between the SRS symbols which are repeatedly transmitted, so that the network equipment can conveniently carry out uplink frequency offset estimation according to the SRS symbols which are repeatedly transmitted, and because a certain interval exists between the SRS symbols, the invention provides support for realizing more accurate uplink frequency offset estimation based on the SRS.

In this embodiment of the present invention, if the SRS resource further configures frequency hopping within a timeslot, the first configuration information may further include: a second symbol interval between starting symbols on frequency domain resources of two adjacent hopping frequencies. At this time, in step 32, the terminal may determine, according to the second symbol interval, a time domain position of a start symbol mapped on the frequency hopping resource of each hop by the SRS resource; and determining the time domain positions of other symbols mapped on the frequency hopping resources of each hop by the SRS resources according to the starting symbol mapped on the frequency hopping resources of each hop by the SRS resources and the first symbol interval, so that the time domain positions of the symbols mapped on the SRS resources can be determined.

Fig. 5 to 6 show two exemplary diagrams of frequency hopping within a time slot, wherein each rectangle filled with patterns in fig. 5 to 6 represents an SRS symbol, and Band1 and Band2 represent frequency domain positions of two frequency hopping resources within the time slot, respectively. The left sides of fig. 5-6 are frequency hopping examples of two repeatedly transmitted SRS symbols in the prior art, respectively, and it can be seen that SRS symbols on each frequency hopping resource and on all frequency hopping resources are continuous in the time domain (horizontal direction). The right sides of fig. 5 to 6 are schematic diagrams of the SRS symbols repeatedly transmitted after the improvement of the embodiment of the present invention, and it can be seen that two SRS symbols of the same frequency hopping in fig. 5 are separated by another symbol, that is, the first symbol interval is 2; and the starting symbol of the SRS on the hopping Band1 is symbol #1 and the starting symbol of the SRS on the hopping Band2 is symbol #2, so that the second symbol interval is 1. Two SRS symbols of the same frequency hop of fig. 6 are spaced 2 other symbols apart, i.e. the first symbol interval is 3; and the starting symbol of the SRS on the hopping Band1 is symbol #1 and the starting symbol of the SRS on the hopping Band2 is symbol #3, so that the second symbol interval is 2.

In the embodiment of the present invention, when there is frequency hopping in a timeslot, the initial symbol interval between two adjacent hops may be flexibly configured, and is not limited to the number R of times of repeated transmission of SRS configured for a network at the interval. For example, when R is 2 and the number Ns of symbols of the pre-configured SRS is 4, the repetition interval may be set to 1 to 4, and the maximum interval is 4 and the start symbol interval of two hops is 1 to 4 because two hops require an interval of the SYS symbol to be greater than 1.

By introducing the first symbol interval in the SRS repeated transmission, the embodiment of the invention can help the network side to obtain a more accurate uplink frequency offset estimation result. When frequency offset estimation is carried out, two columns of correlation values are obtained to obtain a phase phi, and the phase phi corresponds to 2pi x fd x delta t. Here, the larger the time interval Δ t, the more accurate the estimation of the frequency offset fd. By introducing the SRS structure with the time interval in the time domain, the frequency offset estimation based on the SRS can obtain a more accurate result, and further the performance of subsequent frequency offset pre-compensation is improved.

In addition, in a scenario where a channel such as a high-speed rail is updated quickly, the SRS mainly plays a role in uplink channel measurement, and the accuracy requirement is not very high. The current NR system supports only comb

factor comb

2 or 4, as shown in fig. 7 at the left side, where each small square in fig. 7 represents an RE. Embodiments of the present invention may set the comb factor to an integer greater than 4, e.g., only one RE per RB for SRS transmission, as shown on the right side of fig. 7.

Specifically, in this embodiment of the present invention, a subcarrier spacing of adjacent Resource Elements (REs) in the SRS resource in a frequency domain may be a predefined value, or may be configured by the first configuration information, where the first configuration information further includes: a subcarrier spacing of adjacent resource elements, REs, in the SRS resource over a frequency domain. Correspondingly, in step 32, the terminal may further determine a frequency domain position of at least one symbol mapped by the SRS resource according to the subcarrier spacing. Here, the subcarrier spacing may be an integer greater than 4.

By introducing a larger subcarrier interval of the SRS, the embodiment of the invention can improve the capacity of the SRS, and is particularly suitable for the scenes of user concentration such as high-speed rails and the like, and the reason is that:

the uplink transmission power of the terminal is limited, and for an edge user, in order to compensate for channel quality deterioration caused by path loss, the power spectral density of a single RE needs to be ensured. Therefore, as the RE density of SRS decreases, the sounding bandwidth is wider with the same power spectral density per RE.

If the UE needs Uplink (UL) bandwidth of sounding 48 RBs, due to power limitation, only 4RB bandwidth can be sent once, comb is 2, 24 REs are total, and the period is 5ms, sounding12 times is needed, and 60ms is needed in total to realize sounding of the entire bandwidth. And when the RE density becomes 1/12 and 24 REs are sent once, the UE can detect 24 RBs once, so that detection of the whole bandwidth can be completed only by 10ms, and therefore more UEs can be accommodated from the time dimension and the frequency domain dimension to perform sounding, SRS capacity is improved, and the method is very beneficial to a scene of high-speed rail, in which the number of users is large.

As a specific implementation, in the SRS-resource configuration in the SRS-config, configuration of repeatedly transmitting a symbol interval (the first symbol interval)/adjacent two-hop start symbol interval (the second symbol interval) may be introduced through RRC signaling configuration in the embodiment of the present invention, and in addition, frequency domain interval (the subcarrier interval) of adjacent REs in SRS transmission may be introduced through RRC signaling configuration, and a value of the frequency domain interval may be an integer greater than 4.

Referring to fig. 8, an embodiment of the present invention provides a SRS receiving method, which may be applied to a network device side, where the network device may be a base station, an RRH, or another device, and as shown in fig. 8, the SRS receiving method includes:

step 81, the network device sends first configuration information of the SRS resource to the terminal, where the first configuration information includes a first symbol interval between repeated symbols in the SRS resource.

Step 82, the network device determines a mapping manner of the SRS resource in the slot according to the first symbol interval.

And step 83, the network device receives the SRS sent by the terminal according to the mapping mode of the SRS resource in the time slot.

Through the above steps, the network device according to the embodiment of the present invention may receive the SRS with the first symbol interval, and further provide support for performing uplink frequency offset estimation by using the SRS.

After the step 83, the network device may further perform uplink frequency offset estimation according to the received SRS repeated symbol, so as to obtain a more accurate frequency offset estimation result, and perform frequency offset pre-compensation processing on the transmitted data by using the obtained frequency offset estimation result, so as to improve the data decoding accuracy and improve the data transmission efficiency.

Similarly, when the SRS resource configures frequency hopping within a timeslot, the first configuration information further includes: a second symbol interval between starting symbols on two adjacent frequency-domain resources; at this time, in step 82, the network device may determine, according to the second symbol interval, a time domain position of a start symbol mapped on the frequency hopping resource of each hop by the SRS resource; and determining the time domain positions of other symbols mapped on the frequency hopping resources of each hop by the SRS resources according to the starting symbol mapped on the frequency hopping resources of each hop by the SRS resources and the first symbol interval.

Similarly, the subcarrier spacing of the adjacent resource elements REs in the SRS resource in the frequency domain may be a predefined value, or the first configuration information further includes: a subcarrier spacing of adjacent resource elements, REs, in the SRS resource over a frequency domain. In step 82, the network device according to the embodiment of the present invention may further determine a frequency domain position of at least one symbol mapped by the SRS resource according to the subcarrier spacing.

Here, the first symbol interval is an integer greater than 1, and/or the subcarrier interval is an integer greater than 4.

The SRS transmission and reception method according to the embodiment of the present invention is described above. Based on the method, the embodiment of the invention also provides equipment for implementing the method.

Referring to fig. 9, an embodiment of the present invention provides a terminal 90, including:

Referring to fig. 10, another structure of a terminal according to an embodiment of the present invention is shown, where the terminal 1000 includes: a processor 1001, a transceiver 1002, a memory 1003, a user interface 1004, and a bus interface, wherein:

in this embodiment of the present invention, the terminal 1000 further includes: a program stored on the memory 1003 and executable on the processor 1001, the program when executed by the processor 1001 implementing the steps of:

In fig. 10, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 1001 and various circuits of memory represented by memory 1003 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1002 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The user interface 1004 may also be an interface capable of interfacing with a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 1001 is responsible for managing a bus architecture and general processes, and the memory 1003 may store data used by the processor 1001 in performing operations.

the program when executed by the processor 1003 may further implement the steps of:

Referring to fig. 11, an embodiment of the present invention provides a structural schematic diagram of a network device 110, where the network device 110 includes:

Optionally, the network device further includes:

Referring to fig. 12, another schematic structural diagram of a network device according to an embodiment of the present invention includes: a processor 1201, a transceiver 1202, a memory 1203 and a bus interface, wherein:

in this embodiment of the present invention, the network device 1200 further includes: a program stored on the memory 1203 and executable on the processor 1201, which when executed by the processor 1201, performs the steps of:

In fig. 12, the bus architecture may include any number of interconnected buses and bridges, with various circuits linking one or more processors, represented by the processor 1201, and memory, represented by the memory 1203. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1202 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 1201 is responsible for managing a bus architecture and general processing, and the memory 1203 may store data used by the processor 1201 in performing operations.

the program when executed by the processor 1203 may further implement the steps of:

the network equipment determines the time domain position of the starting symbol mapped by the SRS resource on the frequency hopping resource of each hop according to the second symbol interval;

Optionally, when executed by the processor 1203, the program may further implement the following steps:

and after receiving the SRS sent by the terminal, carrying out uplink frequency offset estimation according to the received repeated symbol of the SRS.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the SRS transmission method or the SRS reception method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A sending method of Sounding Reference Signal (SRS) is applied to a terminal, and is characterized by comprising the following steps:

2. The method of claim 1,

when the SRS resource configures frequency hopping within a timeslot, the first configuration information further includes: a second symbol interval between starting symbols on two adjacent frequency-domain resources;

3. The method of claim 2, wherein a subcarrier spacing in a frequency domain of adjacent Resource Elements (REs) in the SRS resources is a predefined value, or wherein the first configuration information further comprises: a subcarrier spacing of adjacent Resource Elements (REs) in the SRS resource in a frequency domain;

4. The method of claim 3, wherein the first symbol interval is an integer greater than 1, and/or the subcarrier interval is an integer greater than 4.

5. A method for receiving Sounding Reference Signals (SRS) is applied to network equipment and is characterized by comprising the following steps:

6. The method of claim 5,

7. The method of claim 6, wherein a subcarrier spacing in a frequency domain of adjacent Resource Elements (REs) in the SRS resources is a predefined value, or wherein the first configuration information further comprises: a subcarrier spacing of adjacent Resource Elements (REs) in the SRS resource in a frequency domain;

8. The method of claim 7, wherein the first symbol interval is an integer greater than 1, and/or the subcarrier interval is an integer greater than 4.

9. The method of claim 7, wherein after the step of receiving the SRS transmitted by the terminal, further comprising:

10. A terminal, comprising:

11. A terminal comprising a transceiver and a processor, wherein,

12. A terminal, comprising: processor, memory and program stored on and executable on the memory, which when executed by the processor implements the steps of the method of transmitting sounding reference signals, SRSs, according to any of claims 1 to 4.

13. A network device, comprising:

14. A network device comprising a transceiver and a processor, wherein,

15. A network device, comprising: processor, memory and program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the method of reception of sounding reference signals, SRS, according to any one of claims 5 to 9.

16. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 9.