WO2021031777A1

WO2021031777A1 - Sounding reference signal sending method and sounding reference signal receiving method, terminal, and network device

Info

Publication number: WO2021031777A1
Application number: PCT/CN2020/103509
Authority: WO
Inventors: 胡丽洁; 王飞; 徐晓东; 王启星
Original assignee: 中国移动通信有限公司研究院; 中国移动通信集团有限公司
Priority date: 2019-08-16
Filing date: 2020-07-22
Publication date: 2021-02-25
Also published as: CN112398618B; CN112398618A

Abstract

A sounding reference signal sending method and a sounding reference signal receiving method, a terminal, and a network device. The method comprises: a terminal receiving first configuration information, sent over a network, of an SRS resource, wherein the first configuration information comprises a first symbol interval between repeated symbols in the SRS resource; the terminal determining, according to the first symbol interval, a mapping mode of the SRS resource in a time slot; and the terminal sending, according to the mapping mode of the SRS resource in the time slot, an SRS to the network.

Description

Sounding reference signal sending method, receiving method, terminal and network equipment

Cross references to related applications

This application claims the priority of Chinese Patent Application No. 201910758987.6 filed in China on August 16, 2019, the entire content of which is incorporated herein by reference.

Technical field

The present disclosure relates to the field of mobile communication technology, and in particular to a method for sending, receiving, a terminal, and a network device of a sounding reference signal.

Background technique

In a scenario where a terminal (such as a UE) is moving rapidly (such as a high-speed rail), in order to avoid frequent handovers of the terminal, the coverage of a cell can be expanded by means of a remote radio head (RRH). Taking high-speed rail as an example, multiple RRHs belonging to the same cell are deployed along the high-speed rail track. These RRHs send data to the terminal at the same time. Usually, the single frequency network (Single Frequency Network, SFN) method can be used to send the data. It is the same and arrives at the terminal through different multipaths. The terminal performs channel estimation, equalization, demodulation and decoding of the multipath data to determine whether the received data is correct. In the above receiving process, it is difficult for the terminal to distinguish which RRH each path comes from.

As shown in Figure 1, the network coverage scenarios of RRH1 to RRH3 deployed along the high-speed rail track are shown. When the train travels to the middle of two RRH sites, the same data sent by the two nearest RRHs usually experience similar and opposite frequency deviations when they reach the terminal on the train. Moreover, since the signal strengths of the two RRHs are close and the pilots used are exactly the same, it is difficult for the terminal to perform effective frequency offset estimation and compensation, resulting in poor channel estimation performance and greatly reduced probability of correct decoding.

In order to solve the above problems in the current network, RRH is used to estimate the uplink frequency offset, and the frequency offset pre-compensation is performed before the data is sent. As shown in Figure 1, RRH1 estimates that the uplink frequency offset of the terminal is a negative frequency offset, so it performs reverse frequency offset pre-compensation before downlink transmission, that is, adds a positive frequency offset. In this way, when the signal experiences a negative frequency offset and arrives at the terminal, the frequency offset will be partially or completely offset. Similarly, the RRH2 also performs a similar frequency offset pre-compensation operation, so that when the signal reaches the terminal, the frequency offset in the positive and negative directions is very small, and the demodulation performance is improved.

The current network usually estimates the uplink frequency offset based on the Demodulation Reference Signal (DMRS) of the uplink traffic channel for pre-compensation of the frequency offset. However, the DMRS depends on the transmission of the uplink traffic channel, and the corresponding DMRS is sent only when there is uplink traffic channel scheduling.

Summary of the invention

At least one embodiment of the present disclosure provides a sounding reference signal SRS sending method, receiving method, terminal, and network equipment, and a symbol interval is introduced between the repeatedly sent SRS symbols to achieve a more accurate uplink frequency offset based on SRS It is estimated to provide support.

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

Receiving 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;

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

According to the mapping mode of the SRS resource in the time slot, the SRS is sent to the network.

Optionally, when the SRS resource is configured with intra-slot frequency hopping, the first configuration information further includes: a second symbol interval between start symbols on two adjacent frequency-hopping frequency domain resources;

The step of determining the mapping mode of the SRS resource in the time slot according to the first symbol interval includes:

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

According to the start symbol mapped by the SRS resource on the frequency hopping resource of each hop and the first symbol interval, the time domain positions of other symbols mapped by the SRS resource on the frequency hopping resource of each hop are determined.

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

The step of determining the mapping mode of the SRS resource in the time slot according to the first symbol interval further includes:

According to the subcarrier interval, the frequency domain position of at least one symbol mapped by the SRS resource is determined.

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 present disclosure also provides a sounding reference signal SRS receiving method, which is applied to network equipment, and includes:

Sending 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;

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

Optionally, the subcarrier spacing of the adjacent resource elements RE in the SRS resource in the frequency domain is a predefined value, or the first configuration information further includes: adjacent resource elements in the SRS resource The sub-carrier spacing of the RE in the frequency domain;

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

Perform uplink frequency offset estimation according to the received repetitive symbols of the SRS.

The embodiment of the present disclosure also provides a terminal, which includes:

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

The sending module is used to send 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, the time domain position of the start symbol mapped by the SRS resource on the frequency hopping resource of each hop; according to the hop of the SRS resource at each hop The start symbol mapped on the frequency resource and the first symbol interval determine the time domain position of other symbols mapped on the frequency hopping resource of each hop by the SRS resource.

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

The embodiment of the present disclosure also provides a terminal, which includes a transceiver and a processor, wherein,

The transceiver is configured to receive first configuration information of SRS resources 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 time slot according to the first symbol interval;

The transceiver is also configured to send SRS to the network according to the mapping mode of the SRS resource in the time slot.

The processor is further configured to determine, according to the second symbol interval, the time domain position of the start symbol mapped by the SRS resource on the frequency hopping resource of each hop; and according to the frequency hopping of the SRS resource at each hop The start symbol mapped on the resource and the first symbol interval determine the time domain position of other symbols mapped on the frequency hopping resource of each hop by the SRS resource.

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

The embodiments of the present disclosure also provide a terminal, which includes: a processor, a memory, and a program stored on the memory and capable of running on the processor. When the program is executed by the processor, the above The steps of the sounding reference signal SRS transmission method described above.

The embodiment of the present disclosure also provides a network device, which includes:

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

A mapping determination module, configured for the network device to determine a mapping manner of the SRS resource in a time slot according to the first symbol interval;

The receiving module is configured to receive the SRS sent by the terminal according to the mapping mode of the SRS resource in the time slot.

Optionally, the network equipment further includes:

The frequency offset estimation unit is configured to, after receiving the SRS sent by the terminal, perform uplink frequency offset estimation according to the received repetitive symbols of the SRS.

The embodiment of the present disclosure also provides a network device, which includes a transceiver and a processor, wherein:

The transceiver is configured to send first configuration information of SRS resources 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, according to the first symbol interval, the mapping mode of the SRS resource in the time slot;

The transceiver is further configured to receive the SRS sent by the terminal according to the mapping mode of the SRS resource in the time slot.

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

The embodiments of the present disclosure also provide a network device, which includes: a processor, a memory, and a program stored on the memory and capable of running on the processor. When the program is executed by the processor, the above The steps of the sounding reference signal SRS receiving method.

According to another aspect of the present disclosure, at least one embodiment provides a computer-readable storage medium having a program stored on the computer-readable storage medium, and when the program is executed by a processor, it implements the method described above. step.

Compared with related technologies, the sounding reference signal sending method, receiving method, terminal, and network equipment provided by the embodiments of the present disclosure introduce a symbol interval between repeatedly sent SRS symbols, which provides support for SRS-based uplink frequency offset estimation . In addition, in the embodiments of the present disclosure, the network-side device may also perform uplink frequency offset estimation based on the symbols with the first symbol interval in the SRS sent by the terminal, which improves the accuracy of the uplink frequency offset estimation based on the SRS.

Description of the drawings

By reading the detailed description of the optional embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only used for the purpose of showing alternative embodiments, and are not considered as a limitation to the present disclosure. Also, throughout the drawings, the same reference symbols are used to denote the same components. In the attached picture:

Figure 1 is a schematic diagram of a network coverage scenario of an RRH deployed along a high-speed rail track in related technologies;

FIG. 2 is a schematic diagram of an application scenario of an embodiment of the disclosure;

FIG. 3 is a flowchart of a sounding reference signal sending method provided by an embodiment of the disclosure;

4 to 7 are diagrams of several examples of SRS mapping provided by embodiments of the disclosure;

FIG. 8 is a flowchart of a sounding reference signal receiving method provided by an embodiment of the disclosure;

FIG. 9 is a schematic structural diagram of a terminal provided by an embodiment of the disclosure;

FIG. 10 is a schematic diagram of another structure of a terminal provided by an embodiment of the disclosure;

FIG. 11 is a schematic diagram of a structure of a network device provided by an embodiment of the disclosure;

FIG. 12 is a schematic diagram of another structure of a network device provided by an embodiment of the disclosure.

detailed description

Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

The terms "first" and "second" in the specification and claims of this application are used to distinguish similar objects, and not necessarily used to describe a specific sequence or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein, for example, can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to the clearly listed Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment. In the specification and claims, "and/or" means at least one of the connected objects.

The technology described in this article is not limited to NR systems and Long Time Evolution (LTE)/LTE-Advanced (LTE-A) systems, and can also be used in various wireless communication systems, such as code division multiple access. (Code Division Multiple Access, CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (Frequency Division Multiple Access, FDMA), Orthogonal Frequency Division Multiple Access (Orthogonal Frequency Division Multiple Access, OFDMA), Single-carrier Frequency-Division Multiple Access (Single-carrier Frequency-Division Multiple Access, SC-FDMA) and other systems. The terms "system" and "network" are often used interchangeably. The CDMA system can implement radio technologies such as CDMA2000 and Universal Terrestrial Radio Access (UTRA). UTRA includes Wideband Code Division Multiple Access (WCDMA) and other CDMA variants. The TDMA system can implement radio technologies such as the Global System for Mobile Communication (GSM). OFDMA systems can implement radios such as UltraMobile Broadband (UMB), Evolved UTRA (Evolution-UTRA, E-UTRA), IEEE 802.16 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. technology. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE and more advanced LTE (such as LTE-A) are new UMTS versions that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The technology described in this article can be used for the systems and radio technologies mentioned above as well as other systems and radio technologies. However, the following description describes the NR system for exemplary purposes, and NR terminology is used in most of the description below, although these techniques can 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 to the function and arrangement of the discussed elements without departing from the spirit and scope of the present disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described method may be performed in an order different from that 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.

Please refer to FIG. 2, which shows a block diagram of a wireless communication system to which the embodiments of the present disclosure are applicable. The wireless communication system includes a terminal 21 and a network device 22. Among them, the terminal 21 may also be referred to as a user terminal or user equipment (User Equipment, UE), and the terminal 21 may be a mobile phone, a tablet (Tablet Personal Computer), a laptop computer (Laptop Computer), or a personal digital assistant (Personal Digital Assistant). , PDA), mobile Internet device (Mobile Internet Device, MID), wearable device (Wearable Device) or vehicle-mounted equipment and other terminal side devices, it should be noted that the specific type of terminal 21 is not limited in the embodiments of the present disclosure . Network device 22 may be the RRH, a base station or core network element, wherein, the base station may be a fifth-generation (5 ^th generation, 5G) and later a base station (e.g.: gNB, 5G NR NB, etc.), or other communication systems The base station (for example: eNB, wireless local area network (Wireless Local Area Network, WLAN) access point, or other access points, etc.), where the base station can be called Node B, evolved Node B, access point, base transceiver Station (Base Transceiver Station, BTS), radio base station, radio transceiver, basic service set (Basic Service Set, BSS), extended service set (Extended Service Set, ESS), Node B, Evolved Node B (eNB), Home Node B, Home Evolved Node B, WLAN Access Point, Wireless Fidelity (WiFi) node, RRH or some other appropriate term in the field, as long as the same technical effect is achieved, the base station is not Limited to specific technical vocabulary, it should be noted that in the embodiments of the present disclosure, only the base station in the NR system is taken as an example, but the specific type of the base station is not limited.

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

The base station can wirelessly communicate with the terminal 21 via one or more access point antennas. Each base station can provide communication coverage for its corresponding coverage area. The coverage area of an access point can be divided into sectors that constitute only a part of the coverage area. The wireless communication system may include different types of base stations (for example, macro base stations, micro base stations, or pico base stations). The base station can also utilize different radio technologies, such as cellular or WLAN radio access technologies. The base stations can be associated with the same or different access networks or operator deployments. The coverage areas of different base stations (including coverage areas of the same or different types of base stations, coverage areas using the same or different radio technologies, or coverage areas belonging to the same or different access networks) may overlap.

The communication link in the wireless communication system may include an uplink for carrying uplink (UL) transmission (for example, from the terminal 21 to the network device 22), or for carrying a downlink (DL) Transmission (for example, from network device 22 to terminal 21) downlink. UL transmission may also be referred to as reverse link transmission, and DL transmission may also be referred to as forward link transmission. Downlink transmission can use licensed frequency bands, unlicensed frequency bands, or both. Similarly, uplink transmission can be performed using licensed frequency bands, unlicensed frequency bands, or both.

As described in the background art, the uplink frequency offset estimation in the high-speed rail scenario depends on the DMRS of the uplink traffic channel, and the DMRS is only sent when there is uplink traffic channel scheduling. Therefore, it is difficult to achieve a stable and reliable uplink frequency based on the DMRS. Partial estimate.

Considering that the use of DMRS for uplink frequency offset estimation is limited by the scheduling of uplink services, and the terminal always needs to send Sounding Reference Signal (SRS) to detect the uplink channel, so the repeated transmission of SRS provides a way A better way to perform uplink channel estimation.

For example, in the design of the New Radio (NR) system, in order to support the coverage enhancement of the SRS, repeated transmission of the SRS is introduced. For example, the number of repeated transmissions of the SRS R can be configured to 2 or 4 times through the network. In addition, the number of SRS symbols Ns can also be configured. among them:

When frequency hopping is not enabled, for example, R=Ns, at this time, in a slot, each SRS port uses the same subcarrier for transmission on all Ns symbols;

When frequency hopping is enabled, for example, R=2, Ns=4, at this time, in a slot, the first 2 symbols are repeatedly sent, and the last 2 symbols are repeatedly sent after frequency hopping. Among them, the repeated symbols are continuous.

It can be seen from the above introduction that in the related technology, whether or not the frequency hopping in the time slot is turned on, the symbols of the R SRS are transmitted continuously. That is to say, in the related art, the repeated transmission of SRS is usually transmitted using adjacent Orthogonal Frequency Division Multiplexing (OFDM) symbols, which may easily affect the accuracy of frequency offset estimation. On the other hand, considering the large number of users in scenarios such as high-speed rail, the channel capacity of SRS also needs to be improved.

In order to solve at least one of the above problems, the embodiments of the present disclosure improve SRS transmission, and introduce a symbol interval between repeated SRS symbols, which provides support for more accurate uplink frequency offset estimation based on SRS. In addition, in the embodiments of the present disclosure, the network-side device may also perform uplink frequency offset estimation based on the symbols with the first symbol interval in the SRS sent by the terminal, which improves the accuracy of the uplink frequency offset estimation based on the SRS.

Referring to FIG. 3, the SRS sending method provided by the embodiment of the present disclosure, when applied to the 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, the embodiment of the present disclosure configures the first symbol interval between SRS symbols repeatedly sent by the terminal through the first configuration information. In the embodiment of the present disclosure, the symbol interval refers to the interval between two symbols, and the interval is expressed in units of symbols. For example, the 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 means that the time domain positions of the two symbols are adjacent; for example, two The symbol interval between the two symbols is 2, which means that the time domain positions of the two symbols are not adjacent, and there is another symbol between them. Specifically, the first symbol interval may be an integer greater than or equal to 1, that is, there is at least 1 symbol interval between adjacent SRS symbols that are repeatedly sent. Therefore, the first symbol interval in the embodiment of the present disclosure is an integer greater than one.

Figure 4 shows a schematic diagram of the interval of repeatedly transmitted SRS symbols, where each rectangle filled with a pattern in Figure 4 represents one SRS symbol, and the left side of Figure 4 is an example of two SRS symbols repeatedly transmitted in the related art, namely The repetitively transmitted SRS symbols are continuous. The right side of FIG. 4 is a schematic diagram of two repetitively transmitted SRS symbols improved in the embodiment of the present disclosure. It can be seen that the symbol interval between the two SRS symbols is 2. There is another symbol between them.

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 is configured with a maximum of 6 symbols, where, when 6 symbols are configured, the symbol interval between the first SRS symbol and the second SRS symbol is a maximum of 5 symbols.

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

Step 33: The terminal sends an SRS to the network according to the mapping manner of the SRS resource in the time slot.

Here, the terminal may perform SRS symbols according to the mapping mode of SRS resources on the time slot, such as the mapped symbols. At this time, the SRS transmitted by the terminal includes repeated transmission of SRS symbols, and the repeated transmission At least one symbol is spaced between adjacent SRS symbols.

Through the above steps, the embodiment of the present disclosure introduces a symbol interval between the repeatedly sent SRS symbols, which is convenient for the network equipment to estimate the uplink frequency offset based on the repeatedly sent SRS symbols. Since there is a certain interval between the SRS symbols, it is more convenient to implement SRS-based Provides support for accurate uplink frequency offset estimation.

In the embodiment of the present disclosure, if the SRS resource is also configured with intra-slot frequency hopping, the first configuration information may further include: the first symbol between the start symbols on two adjacent frequency hopping frequency domain resources Two symbol interval. At this time, in the above step 32, the terminal may determine the time domain position of the start symbol mapped by the SRS resource on the frequency hopping resource of each hop according to the second symbol interval; and, according to the SRS The start symbol of the resource mapping on the frequency hopping resource of each hop, and the first symbol interval, determine the time domain position of other symbols mapped by the SRS resource on the frequency hopping resource of each hop, so that the SRS resource can be determined The time domain position of each symbol being mapped.

Figures 5 to 6 show two example diagrams of frequency hopping in a time slot. Each rectangle filled with patterns in Figures 5 to 6 represents an SRS symbol, and Band1 and Band2 represent two frequency hopping in the time slot. The frequency domain location where the resource is located. The left side of Figures 5 to 6 are examples of frequency hopping of two SRS symbols repeatedly sent in the related art. It can be seen that the SRS symbols on each frequency hopping resource and all frequency hopping resources are in the time domain (lateral direction). ) Are all continuous. The right side of Figs. 5 to 6 are schematic diagrams of retransmitted SRS symbols improved by the embodiments of the present disclosure. It can be seen that there is one other symbol between two SRS symbols of the same frequency hopping in Fig. 5, that is, the first The symbol interval is 2; and the start symbol of the SRS on the frequency hopping Band1 is symbol #1, and the start symbol of the SRS on the frequency hopping Band2 is symbol #2, so the second symbol interval is 1. The two SRS symbols of the same frequency hopping in FIG. 6 are separated by 2 other symbols, that is, the first symbol interval is 3; and the start symbol of the SRS on the frequency hopping Band1 is symbol #1, on the frequency hopping Band2 The start symbol of the SRS is symbol #3, so the second symbol interval is 2.

In the embodiments of the present disclosure, when there is frequency hopping within a time slot, the starting symbol interval between two adjacent hops can be flexibly configured, and is not limited to the number of repeated transmissions R of the SRS configured by the network. For example, when R=2 and the number of pre-configured SRS symbols Ns=4, the repetition interval can be set to 1~4. Due to two hops, the interval between SYS symbols on each hop needs to be greater than 1, so the maximum interval It is 4, and the starting symbol interval of two hops is 1～4.

By introducing the first symbol interval in the repeated transmission of the SRS, the embodiments of the present disclosure can help the network side obtain a more accurate uplink frequency offset estimation result. When doing frequency offset estimation, the correlation value of the two columns is obtained to obtain the phase Φ, which corresponds to 2pi*fd*Δt. Here, the larger the time interval Δt, the more accurate the estimation of the frequency offset fd. By introducing such an SRS structure with time intervals in the time domain, the embodiments of the present disclosure can make the frequency offset estimation based on the SRS obtain more accurate results, thereby improving the performance of subsequent frequency offset precompensation.

In addition, since the main function of SRS is used for uplink channel measurement in scenarios with fast channel update such as high-speed rail, it does not require very high accuracy, so it can be considered to increase the RE interval of SRS in this scenario. In the related art, the NR system only supports comb factor comb=2 or 4. As shown on the left side of FIG. 7, comb=2, and each small square in FIG. 7 represents an RE. In the embodiment of the present disclosure, the comb factor can be set to an integer greater than 4. For example, each resource block (RB) has only one RE for SRS transmission, as shown on the right side of FIG. 7.

Specifically, in the embodiment of the present disclosure, the subcarrier spacing of adjacent resource elements (RE) in the SRS resource in the frequency domain may be a predefined value, or it may be configured through the first configuration information. At this time, the first configuration information further includes: the subcarrier spacing of adjacent resource elements RE in the SRS resource in the frequency domain. Correspondingly, in the foregoing step 32, the terminal may also determine the frequency domain position of at least one symbol mapped by the SRS resource according to the subcarrier interval. Here, the sub-carrier spacing may be an integer greater than 4.

By introducing a larger subcarrier interval for SRS, the embodiments of the present disclosure can increase the capacity of SRS, which is particularly suitable for scenarios where users are concentrated, such as high-speed rail. The reasons are:

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

If the UE needs sounding 48RB uplink (UL) bandwidth, due to power limitation, only 4RB bandwidth can be sent at a time, comb=2, a total of 24 REs, and a period of 5ms, it needs sounding 12 times, and a total of 60ms is required to achieve Full bandwidth detection. However, when the RE density becomes 1/12 and 24 REs are sent in a single time, the UE can detect 24 RBs at a time, so that it only takes 10ms to complete the detection of the full bandwidth. Therefore, it can accommodate from the time dimension and frequency domain dimension More UEs perform sounding and increase the SRS capacity, which is very beneficial for scenarios with a large number of users such as high-speed rail.

As a specific implementation, the embodiments of the present disclosure can be configured through radio resource control (Radio Resource Control, RRC) signaling. In the SRS-resource configuration in SRS-config, the repeated transmission symbol interval (the first symbol interval ) Configuration/the adjacent two-hop start symbol interval (the second symbol interval), in addition, the frequency domain interval (the subcarrier interval) of adjacent REs for SRS transmission can be introduced through RRC signaling configuration, which The value can be an integer greater than 4.

Referring to FIG. 8, an embodiment of the present disclosure provides an SRS receiving method, which can be applied to a network device side. The network device may be a base station or an RRH or other device. As shown in FIG. 8, the 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 time slot according to the first symbol interval.

Step 83: The network device receives the SRS sent by the terminal according to the mapping manner of the SRS resource in the time slot.

Through the above steps, the network device of the embodiment of the present disclosure can receive the SRS with the first symbol interval, thereby providing support for using the SRS to estimate the uplink frequency offset.

After the above step 83, the network device can also perform uplink frequency offset estimation according to the received repetitive symbols of the SRS, so as to obtain a more accurate frequency offset estimation result, and use the obtained frequency offset estimation result to perform the frequency offset estimation of the transmitted data. Partial pre-compensation processing can improve the accuracy of data decoding and improve data transmission efficiency.

Similarly, when the SRS resource is configured with frequency hopping within a time slot, the first configuration information further includes: the second symbol interval between the start symbols on two adjacent frequency hopping frequency domain resources; In the above step 82, the network device may determine the time domain position of the start symbol mapped by the SRS resource on the frequency hopping resource of each hop according to the second symbol interval; and, according to the SRS The start symbol of the resource mapping on the frequency hopping resource of each hop and the first symbol interval determine the time domain position of other symbols mapped by the SRS resource on the frequency hopping resource of each hop.

Similarly, the subcarrier spacing of the adjacent resource elements RE in the SRS resource in the frequency domain may be a predefined value, or the first configuration information may further include: adjacent resource elements in the SRS resource The sub-carrier spacing of the RE in the frequency domain. In the network device of the embodiment of the present disclosure, in step 82, the frequency domain position of at least one symbol mapped by the SRS resource may also be determined according to the subcarrier interval.

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

The above describes the SRS sending and receiving methods of the embodiments of the present disclosure. Based on the above method, the embodiments of the present disclosure also provide a device for implementing the above method.

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

Please refer to FIG. 10, another structure of a terminal provided by an embodiment of the present disclosure. The terminal 1000 includes a processor 1001, a transceiver 1002, a memory 1003, a user interface 1004, and a bus interface, where:

In the embodiment of the present disclosure, the terminal 1000 further includes: a program that is stored in the memory 1003 and can be run on the processor 1001. When the program is executed by the processor 1001, the following steps are implemented:

In FIG. 10, the bus architecture may include any number of interconnected buses and bridges. Specifically, one or more processors represented by the processor 1001 and various circuits of the memory represented by the memory 1003 are linked together. The bus architecture can also link various other circuits such as peripherals, voltage regulators, power management circuits, etc., which are all known in the art, and therefore, no further descriptions are provided herein. The bus interface provides the interface. The transceiver 1002 may be a plurality of elements, that is, including a transmitter and a receiver, and provide a unit for communicating with various other devices on a transmission medium. For different user equipment, the user interface 1004 may also be an interface that can externally and internally connect the required equipment. The connected equipment includes but is not limited to a keypad, a display, a speaker, a microphone, a joystick, etc.

The processor 1001 is responsible for managing the bus architecture and general processing, and the memory 1003 can store data used by the processor 1001 when performing operations.

When the program is executed by the processor 1003, the following steps may also be implemented:

Please refer to FIG. 11, an embodiment of the present disclosure provides a schematic structural diagram of a network device 110, and the network device 110 includes:

Optionally, the network equipment further includes:

Please refer to FIG. 12, an embodiment of the present disclosure provides another schematic structural diagram of a network device, including: a processor 1201, a transceiver 1202, a memory 1203, and a bus interface, where:

In the embodiment of the present disclosure, the network device 1200 further includes: a program that is stored in the memory 1203 and can run on the processor 1201, and when the program is executed by the processor 1201, the following steps are implemented:

In FIG. 12, the bus architecture may include any number of interconnected buses and bridges. Specifically, one or more processors represented by the processor 1201 and various circuits of the memory represented by the memory 1203 are linked together. The bus architecture can also link various other circuits such as peripherals, voltage regulators, power management circuits, etc., which are all known in the art, and therefore, no further descriptions are provided herein. The bus interface provides the interface. The transceiver 1202 may be a plurality of elements, that is, including a transmitter and a receiver, and provide a unit for communicating with various other devices on a transmission medium.

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

When the program is executed by the processor 1203, the following steps may also be implemented:

The network device determines, according to the second symbol interval, the time domain position of the start symbol mapped by the SRS resource on the frequency hopping resource of each hop;

Optionally, when the program is executed by the processor 1203, the following steps may also be implemented:

After receiving the SRS sent by the terminal, perform uplink frequency offset estimation according to the received repetitive symbols of the SRS.

A person of ordinary skill in the art may be aware that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of the present disclosure.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the embodiments provided in this application, it should be understood that the disclosed device and method may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments of the present disclosure.

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

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of the present disclosure essentially or the part that contributes to the related technology or the part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several The instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the SRS sending method or the SRS receiving method described in the various embodiments of the present disclosure. The aforementioned storage media include: U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk and other media that can store program codes.

A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by controlling the relevant hardware through a computer program. The program can be stored in a computer readable storage medium. When executed, it may include the processes of the above-mentioned method embodiments. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), or a random access memory (Random Access Memory, RAM), etc.

It can be understood that the embodiments described in the embodiments of the present disclosure may be implemented by hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, modules, units, and sub-units can be implemented in one or more Application Specific Integrated Circuits (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSP Device, DSPD) ), Programmable Logic Device (PLD), Field-Programmable Gate Array (FPGA), general-purpose processors, controllers, microcontrollers, microprocessors, used to implement Described functions in other electronic units or combinations thereof.

For software implementation, the technology described in the embodiments of the present disclosure can be implemented by modules (for example, procedures, functions, etc.) that perform the functions described in the embodiments of the present disclosure. The software codes can be stored in the memory and executed by the processor. The memory can be implemented in the processor or external to the processor.

The above are only specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present disclosure. It should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

A method for sending sounding reference signal SRS, applied to a terminal, includes:

Receiving 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;

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

According to the mapping mode of the SRS resource in the time slot, the SRS is sent to the network.
The method of claim 1, wherein:

When the SRS resource is configured with intra-slot frequency hopping, the first configuration information further includes: a second symbol interval between the start symbols on two adjacent frequency hopping frequency domain resources;

The step of determining the mapping mode of the SRS resource in the time slot according to the first symbol interval includes:

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

According to the start symbol mapped by the SRS resource on the frequency hopping resource of each hop and the first symbol interval, the time domain positions of other symbols mapped by the SRS resource on the frequency hopping resource of each hop are determined.
The method according to claim 2, wherein the subcarrier spacing of adjacent resource elements RE in the SRS resource in the frequency domain is a predefined value, or the first configuration information further includes: the SRS The subcarrier spacing of adjacent resource elements RE in the resource in the frequency domain;

The step of determining the mapping mode of the SRS resource in the time slot according to the first symbol interval further includes:

According to the subcarrier interval, the frequency domain position of at least one symbol mapped by the SRS resource is determined.
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.
A sounding reference signal SRS receiving method, applied to network equipment, includes:

Sending 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;

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

Receiving the SRS sent by the terminal according to the mapping mode of the SRS resource in the time slot.
The method of claim 5, wherein:

When the SRS resource is configured with intra-slot frequency hopping, the first configuration information further includes: a second symbol interval between the start symbols on two adjacent frequency hopping frequency domain resources;

The step of determining the mapping mode of the SRS resource in the time slot according to the first symbol interval includes:

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

According to the start symbol mapped by the SRS resource on the frequency hopping resource of each hop and the first symbol interval, the time domain positions of other symbols mapped by the SRS resource on the frequency hopping resource of each hop are determined.
The method according to claim 6, wherein the subcarrier spacing of adjacent resource elements RE in the SRS resource in the frequency domain is a predefined value, or the first configuration information further includes: the SRS The subcarrier spacing of adjacent resource elements RE in the resource in the frequency domain;

The step of determining the mapping mode of the SRS resource in the time slot according to the first symbol interval further includes:

According to the subcarrier interval, the frequency domain position of at least one symbol mapped by the SRS resource is determined.
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.
The method according to claim 7, wherein after the step of receiving the SRS sent by the terminal, the method further comprises:

Perform uplink frequency offset estimation according to the received repetitive symbols of the SRS.
A terminal including:

A receiving module, configured to receive first configuration information of a sounding reference signal 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 a mapping manner of the SRS resource in a time slot according to the first symbol interval;

The sending module is used to send SRS to the network according to the mapping mode of the SRS resource in the time slot.
A terminal including a transceiver and a processor, wherein,

The transceiver is configured to receive first configuration information of a sounding reference signal 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 time slot according to the first symbol interval;

The transceiver is also configured to send SRS to the network according to the mapping mode of the SRS resource in the time slot.
A terminal, comprising: a processor, a memory, and a program stored on the memory and capable of running on the processor, and when the program is executed by the processor, implements any one of claims 1 to 4 The steps of the method for sending the sounding reference signal SRS.
A network device, including:

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

A mapping determination module, configured for the network device to determine a mapping manner of the SRS resource in a time slot according to the first symbol interval;

The receiving module is configured to receive the SRS sent by the terminal according to the mapping mode of the SRS resource in the time slot.
A network device including a transceiver and a processor, wherein,

The transceiver is configured to send first configuration information of a sounding reference signal 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, according to the first symbol interval, the mapping mode of the SRS resource in the time slot;

The transceiver is further configured to receive the SRS sent by the terminal according to the mapping mode of the SRS resource in the time slot.
A network device, comprising: a processor, a memory, and a program stored on the memory and capable of running on the processor. The program is executed by the processor to implement any one of claims 5 to 9 The steps of the sounding reference signal SRS receiving method described in the item.
A computer-readable storage medium having a computer program stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 9 are realized.