Signal sending method and device, network equipment and computer readable storage medium

Abstract

The invention discloses a signal sending method and device, network equipment and a computer readable storage medium. The method comprises the following steps: configuring a channel state information reference signal CSI-RS resource set for a target cell; wherein the target cell represents a cell corresponding to radio frequency combination of at least two radio remote units (RRUs) of the network equipment; the CSI-RS resource set comprises at least two CSI-RS resources, and the base sequences of the at least two CSI-RS resources are the same; the at least two CSI-RS resources are sent to user equipment (UE); the at least two CSI-RS resources are used for the UE to measure corresponding reference signal received power (RSRP) to obtain a measurement result, and the measurement result is used for reflecting a coverage relationship between the UE and the RRU.

Description

Technical Field

[0001] This application relates to the field of communication network technologies, and in particular, to a signal sending method, apparatus, network device, and computer-readable storage medium. Background Art

[0002] Currently, the problem of inter-cell interference can be solved through the cell merging technology of Radio Remote Units (RRUs). Although radio frequency merging is simple to implement, does not increase the processing volume of the Baseband Unit (BBU), and has the advantage of low cost, however, direct merging in the uplink direction will increase the noise floor and affect the performance of the receiver; in the downlink direction, multiple RRUs can only send the same signal. Therefore, when multiple RRU signals in the uplink are merged, only all terminals can be seen, and it is impossible to distinguish the RRU to which the terminal is connected, that is, it is impossible to identify in which main coverage area of which RRU each terminal is located. There is no effective solution in the related art. Summary of the Invention

[0003] To solve the technical problems existing in the related art, embodiments of this application provide a signal sending method, apparatus, network device, and computer-readable storage medium.

[0004] To achieve the above object, the technical solution of the embodiments of this application is implemented as follows:

[0005] In a first aspect, an embodiment of this application provides a signal sending method, which is applied to a network device, and the method includes:

[0006] Configure a Channel State Information-Reference Symbol (CSI-RS) resource set for a target cell; wherein, the target cell represents a cell corresponding to the radio frequency merging of at least two RRUs of the network device; the CSI-RS resource set includes at least two CSI-RS resources, and the basic sequences of the at least two CSI-RS resources are the same;

[0007] Send the at least two CSI-RS resources to a User Equipment (UE); the at least two CSI-RS resources are used for the UE to measure the corresponding Reference Signal Receiving Power (RSRP) to obtain a measurement result, and the measurement result is used to reflect the coverage relationship between the UE and the RRU.

[0008] In a second aspect, an embodiment of this application further provides a signal sending apparatus, which is applied to a network device, and includes:

[0009] A configuration unit, configured to configure a CSI-RS resource set for a target cell; wherein, the target cell represents a cell corresponding to radio frequency combination of at least two RRUs of the network device; the CSI-RS resource set includes at least two CSI-RS resources, and the base sequences of the at least two CSI-RS resources are the same;

[0010] A sending unit, configured to send the at least two CSI-RS resources to a UE; the at least two CSI-RS resources are used for the UE to measure the corresponding RSRP to obtain a measurement result, and the measurement result is used to reflect the coverage relationship between the UE and the RRU.

[0011] In a third aspect, an embodiment of the present application further provides a network device, including: a processor and a memory for storing a computer program that can run on the processor;

[0012] Wherein, when the processor is used to run the computer program, it executes the steps of the signal sending method described in the embodiment of the present application.

[0013] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the signal sending method described in the embodiment of the present application.

[0014] The signal sending method, device, network device, and computer-readable storage medium provided by the embodiments of the present application configure a CSI-RS resource set for a target cell through a network device, wherein the target cell represents a cell corresponding to radio frequency combination of at least two RRUs of the network device; the CSI-RS resource set includes at least two CSI-RS resources, and the base sequences of the at least two CSI-RS resources are the same; send the at least two CSI-RS resources to a UE; the at least two CSI-RS resources are used for the UE to measure the corresponding RSRP to obtain a measurement result, and the measurement result is used to reflect the coverage relationship between the UE and the RRU. By adopting the solution of the embodiment of the present application, each CSI-RS resource in the CSI-RS resource set has the same base sequence through the configuration of the CSI-RS resource set. Based on this, the CSI-RS resources for multiple RRUs to send are generated by cyclically shifting the first CSI-RS resource sequence, that is, the base sequence, so that each RRU in the radio frequency combination of the network device can send different CSI-RS resources respectively. Furthermore, the UE measures the corresponding RSRP for different CSI-RS resources, and judges the coverage relationship between the UE and the RRU based on the measurement result; that is to say, based on the measurement results of the RSRP of at least two CSI-RS resources, the UE can accurately identify the RRU to which each UE belongs, that is, which RRU's main coverage range each terminal is in. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the architecture of the extended pico base station provided by this application;

[0016] Figure 2 It is a schematic diagram of radio frequency combining provided by this application Figure 1 ;

[0017] Figure 3 It is a schematic diagram of radio frequency combining provided by this application Figure 2 ;

[0018] Figure 4 It is a schematic diagram of radio frequency combining provided by this application Figure 3 ;

[0019] Figure 5 It is a schematic flow diagram of the signal sending method according to an embodiment of this application Figure 1 ;

[0020] Figure 6 It is a schematic flow diagram of the signal sending method according to an embodiment of this application Figure 2 ;

[0021] Figure 7 It is a schematic diagram of the structure of the CSI-RS resource set provided by this application;

[0022] Figure 8 It is a schematic diagram of the cyclic shift process provided by this application;

[0023] Figure 9 It is a schematic diagram of the composition structure of the signal sending device according to an embodiment of this application;

[0024] Figure 10 It is a schematic diagram of the hardware composition structure of the network device according to an embodiment of this application. Detailed Description of the Invention

[0025] The present application will be further described in detail below with reference to the drawings and embodiments.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0027] Figure 1 It is a schematic diagram of the architecture of the extended pico base station provided by this application, as Figure 1As shown in the figure, in the architecture of a common extended pico base station, the BBU is connected to the expansion unit (EU), and the EU is connected to the RRU. Usually, the same EU supports connecting multiple RRUs to cover a larger area, which is more cost-effective. In the uplink direction, the uplink signals sent by multiple RRUs connected to the same EU are radio frequency combined in the EU, and the uplink signal received by the BBU is a combined set of signals. In the downlink direction, a set of signals generated by the BBU is replicated into multiple sets according to the number of RRUs in the EU.

[0028] It can be seen that whether in the uplink direction or the downlink direction, there is only one set of signal transmission between the BBU and the EU. The interface design, link bandwidth, and baseband processing resources of the same logical cell are all designed according to the processing volume of one set of signals to give full play to the cost advantage of the extended pico base station. Among them, each set of signals can be set to 2T2R, 4T4R, etc. according to the different number of channels of the RRU, which is not specifically limited here.

[0029] Considering that radio frequency combination will increase the noise floor and thus affect the receiver performance, the common requirement of operators is to support at least 32 RRUs for cell combination, and the radio frequency combination does not exceed 8 RRUs; that is to say, when supporting cell combination of more than 8 RRUs, it will be achieved by two-level combination, namely radio frequency combination and baseband combination. Figure 2 Schematic diagram of radio frequency combination provided by this application Figure 1 , as Figure 2 shown, the expansion unit 1, expansion unit 2, expansion unit 3, and expansion unit 4 respectively perform radio frequency combination on no more than 8 RRUs, and the BBU receives multiple sets of signals from multiple EUs and combines them for cell processing.

[0030] Among them, the specific quantities of radio frequency combination and baseband combination can be flexibly set according to different coverage requirements. Figure 3 Schematic diagram of radio frequency combination provided by this application Figure 2 , as Figure 3 shown, for each expansion unit, multiple RRUs are radio frequency combined to form four independent cells correspondingly.

[0031] Two-level operations for cell aggregation: baseband aggregation and radio frequency aggregation, each with its own functions and problems. For baseband aggregation, since multiple sets of signals are visible, the processing method is more flexible, providing the basis for supporting more advanced cell aggregation functions. In the uplink direction, multiple sets of signals can be processed separately to pursue processing efficiency, or multiple sets of signals can be aggregated for processing to obtain diversity gain, etc.; in the downlink direction, the BBU can generate only one set of signals and duplicate it into multiple sets of signals to save processing resources, or generate different multiple sets of signals and send different contents to achieve advanced functions such as spatial multiplexing. However, the processing resources for baseband aggregation are equivalent to those of multiple independent cells, and the implementation complexity is higher.

[0032] For radio frequency aggregation, in the uplink direction, multiple sets of signals are combined into one set of signals; in the downlink direction, one set of signals can be duplicated into multiple identical sets of signals. It can be seen that although radio frequency aggregation is simple to implement and does not increase the processing volume of the BBU, it has a cost advantage. However, the direct combination in the uplink direction will increase the noise floor and affect the receiver performance; in the downlink direction, multiple RRUs can only send the same signal and cannot send different signals on different RRUs.

[0033] In the actual use of extended pico base stations, considering multiple dimensions such as cost and complexity, radio frequency aggregation is a more basic requirement and is used more widely. Therefore, it is necessary to accept its disadvantages of increasing the noise floor in the uplink and not being able to send different signals on different RRUs in the downlink.

[0034] Figure 4 Schematic diagram of radio frequency aggregation provided by this application Figure 3 , as Figure 4 shown, after the signals of multiple RRUs are combined in the uplink direction, only all terminals are visible, but the RRUs to which the terminals are connected cannot be distinguished, and thus more refined functions cannot be completed. For example, Figure 4 the BBU in

[0035] However, this solution has the following problems: on the one hand, punching operations can only be performed in the frequency domain, which limits the type of the RRU's fronthaul interface to option 7-2; on the other hand, the RRU needs to perform baseband operations based on the time-frequency resource information, which increases the implementation complexity of the RRU and loses the cost advantage of the extended pico base station. In addition, the real-time transmission and coordination of information such as time-frequency resources between the BBU and the RRU or EU is very complex, difficult to implement and has poor system stability.

[0036] It can be seen that there is no effective solution in the related art for sending different reference signals in the RRU with RF merger, and thus it is impossible to accurately identify which RRU's main coverage area each terminal is in.

[0037] Based on this, an embodiment of the present application proposes a signal sending method. In various embodiments of the present application, the CSI-RS resource set is configured so that each CSI-RS resource in the CSI-RS resource set has the same base sequence. Based on this, the CSI-RS resources for transmission by multiple RRUs are generated by cyclically shifting the first CSI-RS resource sequence, i.e., the base sequence, so that the network device can send different CSI-RS resources respectively in each RRU merged in the RF, and then perform corresponding RSRP measurements on different CSI-RS resources through the UE, and judge the coverage relationship between the UE and the RRU based on the measurement results; that is, the UE can accurately identify the RRU to which each UE belongs, i.e., the main coverage range of which RRU each terminal is in, based on the measurement results of the RSRP of at least two CSI-RS resources.

[0038] The present application embodiment provides a signal sending method, which is applied to a network device. Figure 5 The signal transmission method of the present invention is shown in FIG. Figure 1 ;like Figure 5 As shown, the signal sending method includes:

[0039] Step 501: configure a CSI-RS resource set for a target cell; wherein the target cell represents a cell corresponding to at least two RRU radio frequency combinations of the network device; the CSI-RS resource set includes at least two CSI-RS resources, and the base sequences of the at least two CSI-RS resources are the same.

[0040] Here, the network device that executes the signal sending method may specifically be an extended pico base station.

[0041] In actual application, the configuration of the CSI-RS resource set includes the configuration of the time-frequency resources of the CSI-RS resources, and specifically, may include the configuration of the time-frequency resources of the single-port CSI-RS resources.

[0042] Based on this, in one embodiment, configuring the CSI-RS resource set for the target cell includes:

[0043] Configuring the time domain position of the single-port CSI-RS resource to be the same Orthogonal Frequency Division Multiplexing (OFDM) symbol;

[0044] Configuring the frequency domain position of the single-port CSI-RS resource to be continuously distributed in sequence in the frequency domain within the same Physical Resource Block (PRB).

[0045] In the embodiments of the present application, the network device configures the CSI-RS resource set, so that each CSI-RS resource in the CSI-RS resource set has the same base sequence, and then resources for multiple RRUs to send can be generated by cyclically shifting the same resource sequence, that is, the base sequence.

[0046] In actual application, before the network device sends the at least two CSI-RS resources to the UE, the network device needs to first obtain the at least two CSI-RS resources by cyclically shifting the first CSI-RS resource sequence, that is, the base sequence, in the frequency domain.

[0047] Based on this, in one embodiment, before sending the at least two CSI-RS resources to the UE, the method further includes:

[0048] Generating a first CSI-RS resource sequence; the first CSI-RS resource sequence represents the base sequence for cyclic shift;

[0049] Performing a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times to obtain the at least two CSI-RS resources; the number of the at least two CSI-RS resources matches the target number of times.

[0050] In actual application, the first CSI-RS resource sequence, which is the base sequence for cyclic shift, is generated only when the network device determines that the CSI-RS resource type meets the conditions.

[0051] Based on this, in one embodiment, the network device further includes a baseband unit, and the first CSI-RS resource sequence is generated by the baseband unit based on a pseudo-random sequence when determining that the CSI-RS resource type meets the first condition.

[0052] Before generating the first CSI-RS resource sequence, the method further includes:

[0053] When the CSI-RS resource type is a single-port CSI-RS resource selected from a set position, it is determined that the CSI-RS resource type meets the first condition.

[0054] It should be noted that the set position is the set table of CSI-RS resource positions in 3GPP standard 38.214. That is, there are various CSI-RS resource types stored in the set table of CSI-RS resource positions in 3GPP standard 38.214. When the network device determines that the obtained CSI-RS resource type is a single-port CSI-RS resource selected from the set table of CSI-RS resource positions, it is determined that the CSI-RS resource type meets the first condition. At this time, the first CSI-RS resource sequence, that is, the base sequence, can be generated.

[0055] In the embodiments of the present application, assuming that the pseudo-random sequence is c(i), the base sequence r(m) of CSI-RS can be generated based on the pseudo-random sequence through the following formula (1):

[0056]

[0057] Among them, r(m) represents the base sequence of CSI-RS, that is, the first CSI-RS resource sequence, and m represents the number of each modulation symbol in the base sequence.

[0058] Among them, the initialization factor of the pseudo-random sequence c(i) can be obtained through the following formula (2):

[0059]

[0060] Among them, c init represents the initialization factor of the pseudo-random sequence c(i); represents the number of OFDM symbols in a time slot; represents the number of time slots in a radio frame; l represents the number of the OFDM symbol in the time slot, n ID represents the configuration parameter scramblingID.

[0061] Here, for the operation of performing a target number of cyclic shifts on the first CSI-RS resource sequence in the frequency domain direction, since the CSI-RS resource sequences at different frequency domain positions within the same PRB are the same, that is, each CSI-RS resource in the CSI-RS resource set has the same base sequence, it is possible to perform a target number of cyclic shifts on the data of one of the CSI-RS resource sequences in the frequency domain direction. For example, by performing 12 cyclic shifts on the data of one of the CSI-RS resource sequences in the frequency domain direction, the frequency domain data of 12 different CSI-RS resources can be obtained, that is, at least two CSI-RS resources can be obtained. Among them, the maximum target number of cyclic shifts is 12. By performing at most 12 cyclic shifts on the base sequence of the CSI-RS, 12 different groups of data are generated, and these 12 different groups of data are respectively used for the downlink transmission of up to 12 radio frequency combined RRUs.

[0062] It should be noted that the embodiment of the present application does not limit the direction of the cyclic shift. The direction of the cyclic shift includes one of the following: forward; reverse; that is to say, it can be a forward cyclic shift operation of a target number on the first CSI-RS resource sequence in the frequency domain direction, or a reverse cyclic shift operation of a target number on the first CSI-RS resource sequence in the frequency domain direction.

[0063] The following describes the specific implementation process of the cyclic shift operation.

[0064] In practical applications, shift parameters are transmitted between the BBU and the EU. The shift parameters are used to represent symbol shift information. Specifically, the symbol shift information, that is, the shift parameters, is transmitted through the interface between the BBU and the EU to perform a cyclic shift operation on the base sequence of the CSI-RS based on the shift parameters.

[0065] Based on this, in an embodiment, the network device further includes an expansion unit and a baseband unit. The operation of performing a target number of cyclic shifts on the first CSI-RS resource sequence in the frequency domain direction to obtain the at least two CSI-RS resources includes:

[0066] The expansion unit obtains the shift parameters sent by the baseband unit; the expansion unit performs a target number of cyclic shifts on the first CSI-RS resource sequence in the frequency domain direction based on the shift parameters to obtain the at least two CSI-RS resources.

[0067] Here, the shift parameters include at least one of the following: symbol shift number indication; shift start PRB; shift PRB length; shift PRB density.

[0068] In an embodiment, the expansion unit obtaining the shift parameters sent by the baseband unit includes:

[0069] Obtain the shift parameter sent by the baseband unit of the network device through a first interface; the first interface is an interface set between the baseband unit and the extension unit.

[0070] In actual application, when the shifted PRB density is set to different values, the cyclic shift method adopted will also be different.

[0071] Based on this, in an embodiment, when the shift parameter includes the shifted PRB density, the extension unit performs a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times based on the shift parameter to obtain the at least two CSI-RS resources, including:

[0072] When the shifted PRB density is a first value, perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction using a first cyclic shift method to obtain the at least two CSI-RS resources;

[0073] When the shifted PRB density is a second value, perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction using a second cyclic shift method to obtain the at least two CSI-RS resources.

[0074] Here, the first value and the second value can be set according to actual needs. For example, the first value can be set to 0.5 and the second value can be set to 1. When the shifted PRB density is configured to 1, it means that the CSI-RS is configured with full bandwidth. At this time, a second cyclic shift method is used to perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times to obtain at least two CSI-RS resources. For example, assuming that the target number of cyclic shifts is 12 times, then a full-bandwidth 12-cycle shift is performed on the first CSI-RS resource sequence to form 12 different reference signal frequency domain data, that is, the overall shift of the subcarrier data of the shifted PRB length * 12 starting from the starting PRB. When the shifted PRB density is configured to 0.5, a more appropriate cyclic shift method is further selected based on the bandwidth configuration state of the CSI-RS resources.

[0075] Based on this, in an embodiment, the first cyclic shift method includes a third cyclic shift method and a fourth cyclic shift method; the performing a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction using the first cyclic shift method to obtain the at least two CSI-RS resources includes:

[0076] Determine the bandwidth configuration state of the CSI-RS resource;

[0077] When the bandwidth configuration state of the CSI-RS resource represents full-bandwidth configuration, perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times using the third cyclic shift method to obtain the at least two CSI-RS resources;

[0078] When the bandwidth configuration state of the CSI-RS resource represents non-full-bandwidth configuration, perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times using the fourth cyclic shift method to obtain the at least two CSI-RS resources.

[0079] Here, the bandwidth configuration state of the CSI-RS resource includes full-bandwidth configuration and non-full-bandwidth configuration. When the bandwidth configuration state of the CSI-RS resource is different, the cyclic shift operation can be performed by distinguishing PRBs using the corresponding cyclic shift method. Among them, the PRBs can be distinguished according to the shift start PRB, the shift PRB length, and the shift PRB density.

[0080] Step 502: Send the at least two CSI-RS resources to the UE; the at least two CSI-RS resources are used for the UE to measure the corresponding RSRP to obtain a measurement result, and the measurement result is used to reflect the coverage relationship between the UE and the RRU.

[0081] Here, the coverage relationship between the UE and the RRU is used to reflect which RRU each UE belongs to. That is to say, through the coverage relationship between the UE and the RRU determined by the terminal, it can be accurately identified which RRU's main coverage range each terminal is in.

[0082] Specifically, in this embodiment, the network device may include at least two RRUs. After obtaining the at least two CSI-RS resources, the network device may send the at least two CSI-RS resources through the at least two RRUs respectively. In this way, the terminals covered by each RRU can measure the CSI-RS resources sent by this RRU. In view of the fact that the CSI-RS resources sent by different RRUs are different, therefore, the measurement result of the CSI-RS resources sent by the network device by the terminal can reflect the coverage relationship between the terminal and the RRU.

[0083] The embodiment of the present application also provides another signal sending method, which is applied to a network device, Figure 6 is a schematic flow of the signal sending method of the embodiment of the present application Figure 2 ; as Figure 6 shown, this signal sending method includes:

[0084] Step 601: Configure a CSI-RS resource set for the target cell.

[0085] Here, the target cell represents the cell corresponding to the radio frequency combination of at least two RRUs of the network device; the CSI-RS resource set includes at least two CSI-RS resources, and the base sequences of the at least two CSI-RS resources are the same.

[0086] Step 602: Determine whether the CSI-RS resource type meets the first condition.

[0087] In one embodiment, the determining whether the CSI-RS resource type meets the first condition includes:

[0088] Obtain the CSI-RS resource type; when the CSI-RS resource type is a single-port CSI-RS resource selected from a set position, determine that the CSI-RS resource type meets the first condition.

[0089] Step 603: When it is determined that the CSI-RS resource type meets the first condition, generate a first CSI-RS resource sequence based on a pseudo-random sequence.

[0090] Here, the first CSI-RS resource sequence represents the base sequence for cyclic shift.

[0091] Step 604: Perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times to obtain at least two CSI-RS resources.

[0092] Here, the number of the at least two CSI-RS resources matches the target number of times.

[0093] In one embodiment, the network device further includes an expansion unit and a baseband unit. The performing a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times to obtain at least two CSI-RS resources includes:

[0094] The expansion unit obtains the shift parameter sent by the baseband unit; the shift parameter includes at least one of the following: symbol shift number indication; shift start PRB; shift PRB length; shift PRB density;

[0095] The expansion unit performs a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction based on the shift parameter to obtain the at least two CSI-RS resources.

[0096] Step 605: Send at least two CSI-RS resources to the UE; the at least two CSI-RS resources are used for the UE to measure the corresponding RSRP to obtain a measurement result, and the measurement result is used to reflect the coverage relationship between the UE and the RRU.

[0097] It should be noted that the specific processing process of the network device for signal transmission has been described in detail above and will not be elaborated here.

[0098] By adopting the technical solution of the embodiment of the present application, each CSI-RS resource in the CSI-RS resource set has the same basic sequence through the configuration of the CSI-RS resource set. Based on this, the CSI-RS resources for multiple RRUs to send are generated by cyclically shifting the first CSI-RS resource sequence, that is, the basic sequence, so that each RRU in the radio frequency combination of the network device can send different CSI-RS resources respectively. Furthermore, the UE performs corresponding RSRP measurements on different CSI-RS resources, and determines the coverage relationship between the UE and the RRU based on the measurement results; that is to say, based on the measurement results of the RSRP of at least two CSI-RS resources, the UE can accurately identify the RRUs to which each UE belongs, that is, which RRU's main coverage range each terminal is in.

[0099] The present application will be described below in conjunction with application embodiments.

[0100] The present application proposes a method for transmitting CSI-RS of an extended pico base station. In the case of radio frequency combination, instead of adopting the puncturing technology in the related art or the scheme of generating multiple groups of baseband data by performing resource mapping for CSI-RS respectively, at least two CSI-RS resources are generated by cyclically shifting in the frequency domain based on the first CSI-RS resource sequence, that is, different RRUs send different CSI-RS through a simple cyclic shift rule, which is used for the terminal to measure the RSRP of at least two CSI-RS resources, and then determine the coverage relationship between the UE and the RRU based on the measurement results of the RSRP.

[0101] Among them, in the present application, a CSI-RS resource set for RSRP measurement is configured. The number of CSI-RS resource sets (CSI-RS resource sets configured for the target cell) cannot exceed 16, and each CSI-RS resource set contains at most 64 CSI-RS resources. The total number of resources in all CSI-RS resource sets does not exceed 128. In actual application, the CSI-RS resource type selects the single-port CSI-RS resource in Row 2 of Table 7.4.1.5.3-1 of 3GPP standard 38.214.

[0102] Generally, the maximum configuration in the CSI-RS resource set does not exceed 12 single-port CSI-RS resources in Row 2, and sequentially occupies 12 subcarriers in the PRB. Among them, the time domain positions of the 12 single-port CSI-RS resources in Row 2 are configured as the same symbol, and the frequency domain positions Configured in sequence as 0...11 or 11...0 (forward or reverse), represented by CSI-RS0, CSI-RS1,..., CSI-RS11 respectively. Figure 7 It is a schematic structural diagram of the CSI-RS resource set provided by this application. As Figure 7 shown, when the CSI-RS resource set configured by the network device for the target cell contains 12 CSI-RS resources, all 12 subcarriers of the PRB are occupied. When the CSI-RS resource set configured by the network device for the target cell contains less than 12 CSI-RS resources, the remaining subcarriers of the PRB are left empty and not used for other data transmissions.

[0103] Under the above configuration, since the CSI-RS resource sequences at different frequency domain positions within the same PRB are the same, that is, the base sequences of at least two CSI-RS resources in the CSI-RS resource set are the same. Therefore, by performing 12 cyclic shifts (forward or reverse cyclic shifts) on the frequency domain data of one CSI-RS resource, the frequency domain data of 12 different CSI-RS resources can be obtained.

[0104] In the architecture of the extended pico base station, the baseband unit only performs resource mapping on CSI-RS0 and maps its sequence to the symbols configured with CSI-RS resources; the baseband unit and the extended unit transfer the symbol shift count indication, the starting PRB of the shift, the length of the shifted PRB, and the density of the shifted PRB. When the density of the shifted PRB is 1, the data of 12 subcarriers with the length of the shifted PRB starting from the starting PRB are shifted as a whole; when the density of the shifted PRB is 0.5, the PRBs to be shifted are cyclically shifted respectively. The extended unit performs up to 12 cyclic shifts on the indicated symbols and PRBs according to the above information to generate 12 groups of different data, which are respectively used for the downlink transmission of up to 12 RRU for radio frequency combining.

[0105] The cyclic shift will be described below with a specific embodiment.

[0106] Taking the subcarrier spacing of 30KHz and the bandwidth of 100MHz as an example, the last OFDM symbol of a certain time slot (slot) is reserved entirely for configuring 12 single-port CSI-RS resources of Row 2, the density ρ of the shifted PRB is configured as 1, the starting PRB is 0, and the length is the full bandwidth. Then the baseband unit generates the sequence of CSI-RS0 and maps it to 3276 (for a 5G 100MHz bandwidth including 273 PRBs, each PRB corresponds to 12 subcarriers, so the total number of subcarriers is 273 * 12 = 3276) subcarriers. The extended unit performs an overall cyclic shift on the 3276 subcarriers, as Figure 8 shown in the cyclic shift process, so as to obtain at least two CSI-RS resources.

[0107] After each CSI-RS resource in the CSI-RS resource set configured for the target cell of this application meets the condition (that is, the CSI-RS resource type is a single-port CSI-RS resource selected from a set position), when performing resource mapping subsequently, the cyclic shift method proposed in this application can be used to place the correct CSI-RS resource sequence at the correct resource position, without the need to perform resource mapping on each CSI-RS resource sequence according to complex time-frequency domain position requirements. That is to say, this application constructs 12 single-port CSI-RS resources with the same sequence, and their frequency-domain position order in the resource block is continuously distributed to form a scheme where different CSI-RS resources can be generated by cyclic shifting a single sequence in the frequency domain, so as to enable each RRU for radio frequency combination to send different CSI-RS. Neither the expansion unit nor the radio frequency unit needs to maintain the pattern of CSI-RS. Compared with the situation where the expansion unit or the radio frequency unit needs to receive relevant time-frequency information and perform operations such as punching on the baseband signal in the frequency domain, the scheme of this application is simpler and more flexible. Moreover, the power measurement of different CSI-RS by the terminal can reflect the coverage relationship between the terminal and the radio frequency unit in real time, so as to accurately identify the RRU to which each UE belongs, that is, in which main coverage range of which RRU each terminal is located.

[0108] To implement the signal transmission method of the embodiments of this application, the embodiments of this application also provide a signal transmission device. This signal transmission device is applied to a network device, and the network device can be an extended pico base station. Figure 9 For the schematic composition structure of the signal transmission device of the embodiments of this application, as Figure 9 shown, this signal transmission device includes:

[0109] A configuration unit 91, configured to configure a CSI-RS resource set for the target cell; wherein, the target cell represents a cell corresponding to the radio frequency combination of at least two RRUs of the network device; the CSI-RS resource set includes at least two CSI-RS resources, and the base sequences of the at least two CSI-RS resources are the same;

[0110] A sending unit 92, configured to send the at least two CSI-RS resources to the UE; the at least two CSI-RS resources are used for the UE to measure the corresponding RSRP to obtain a measurement result, and the measurement result is used to reflect the coverage relationship between the UE and the RRU.

[0111] In one embodiment, the configuration unit 91 is specifically configured to:

[0112] Configure the time domain position of the single-port CSI-RS resource to be the same OFDM symbol;

[0113] Configure the frequency domain position of the single-port CSI-RS resource to be continuously distributed in sequence in the frequency domain within the same PRB.

[0114] In one embodiment, the device further includes: a generating unit and a shifting unit; wherein,

[0115] The generating unit is configured to generate a first CSI-RS resource sequence; the first CSI-RS resource sequence represents the base sequence for cyclic shift.

[0116] The shifting unit is configured to perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times to obtain the at least two CSI-RS resources; the number of the at least two CSI-RS resources matches the target number of times.

[0117] In one embodiment, the network device further includes a baseband unit, and the first CSI-RS resource sequence is generated based on a pseudo-random sequence by the baseband unit when it is determined that the CSI-RS resource type meets the first condition.

[0118] In one embodiment, the device further includes: a determining unit; wherein,

[0119] The determining unit is configured to determine that the CSI-RS resource type meets the first condition when the CSI-RS resource type is a single-port CSI-RS resource selected from a set position.

[0120] In one embodiment, the network device further includes an extension unit and a baseband unit, and the shifting unit includes an obtaining subunit and a processing subunit; wherein,

[0121] The obtaining subunit is configured to obtain a shifting parameter sent by the baseband unit of the network device; the shifting parameter includes at least one of the following: symbol shifting times indication; shifting start PRB; shifting PRB length; shifting PRB density;

[0122] The processing subunit is configured to perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction based on the shifting parameter to obtain the at least two CSI-RS resources.

[0123] In one embodiment, the obtaining subunit is specifically configured to:

[0124] Obtain the shifting parameter sent by the baseband unit of the network device through a first interface; the first interface is an interface provided between the baseband unit and the extension unit.

[0125] In one embodiment, when the shifting parameter includes a shifting PRB density, the processing subunit is specifically configured to:

[0126] When the shifted PRB density is a first value, perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times by using a first cyclic shift method to obtain the at least two CSI-RS resources;

[0127] When the shifted PRB density is a second value, perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times by using a second cyclic shift method to obtain the at least two CSI-RS resources.

[0128] In one embodiment, the first cyclic shift method includes a third cyclic shift method and a fourth cyclic shift method; the processing subunit is further specifically configured to:

[0129] Determine the bandwidth configuration state of the CSI-RS resource;

[0130] When the bandwidth configuration state of the CSI-RS resource represents a full bandwidth configuration, perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times by using the third cyclic shift method to obtain the at least two CSI-RS resources;

[0131] When the bandwidth configuration state of the CSI-RS resource represents a non-full bandwidth configuration, perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times by using the fourth cyclic shift method to obtain the at least two CSI-RS resources.

[0132] In practical applications, the configuration unit 91 may be implemented by a processor in the signal sending device, and the sending unit 92 may be implemented by a communication interface in the signal sending device.

[0133] It should be noted that: when the signal sending device provided in the above embodiment performs signal sending, only the division of the above program modules is used for illustration. In practical applications, the above processing may be allocated to different program modules according to needs, that is, the internal structure of the device is divided into different program modules to complete all or part of the processing described above. In addition, the signal sending device provided in the above embodiment and the signal sending method embodiment belong to the same concept, and the specific implementation process thereof can be seen in the foregoing signal sending method embodiment, which will not be elaborated here.

[0134] Based on the hardware implementation of the above program modules, and in order to implement the signal sending method of the embodiments of the present application, the embodiments of the present application further provide a network device, and this network device may be an extended pico base station, Figure 10 is a schematic diagram of the hardware composition structure of the network device of the embodiments of the present application, as Figure 10As shown in the figure, the network device 1000 includes:

[0135] A communication interface 1001 capable of information interaction with the UE;

[0136] A processor 1002, connected to the communication interface 1001 to achieve information interaction with the UE, and when running a computer program, execute the signal sending method provided above, and the computer program is stored on a memory 1003.

[0137] Specifically, the processor 1002 is used to configure a CSI-RS resource set for a target cell; wherein, the target cell represents a cell corresponding to at least two RRU radio frequency merges of the network device; the CSI-RS resource set includes at least two CSI-RS resources, and the basic sequences of the at least two CSI-RS resources are the same;

[0138] The communication interface 1001 is used to send the at least two CSI-RS resources to the UE; the at least two CSI-RS resources are used for the UE to measure the corresponding RSRP to obtain a measurement result, and the measurement result is used to reflect the coverage relationship between the UE and the RRU.

[0139] In one embodiment, the processor 1002 is specifically used for:

[0140] Configure the time domain position of the single-port CSI-RS resource to be the same OFDM symbol;

[0141] Configure the frequency domain position of the single-port CSI-RS resource to be continuously distributed in sequence in the same PRB in the frequency domain.

[0142] In one embodiment, the processor 1002 is further used for: generating a first CSI-RS resource sequence; the first CSI-RS resource sequence represents the basic sequence for cyclic shift;

[0143] The processor 1002 is further used for: performing a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times to obtain the at least two CSI-RS resources; the number of the at least two CSI-RS resources matches the target number.

[0144] Here, the network device further includes a baseband unit, and the first CSI-RS resource sequence is generated by the baseband unit based on a pseudo-random sequence when it is determined that the CSI-RS resource type meets the first condition.

[0145] In one embodiment, the processor 1002 is further configured to: when the CSI-RS resource type is a single-port CSI-RS resource selected from a set position, determine that the CSI-RS resource type meets the first condition.

[0146] In one embodiment, the network device further includes an extension unit and a baseband unit. The communication interface 1001 is further configured to: obtain a shift parameter sent by the baseband unit; the shift parameter includes at least one of the following: symbol shift count indication; shift start PRB; shift PRB length; shift PRB density.

[0147] The processor 1002 is specifically configured to: based on the shift parameter, perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times to obtain the at least two CSI-RS resources.

[0148] In one embodiment, the communication interface 1001 is specifically configured to:

[0149] obtain the shift parameter sent by the baseband unit of the network device through a first interface; the first interface is an interface provided between the baseband unit and the extension unit.

[0150] In one embodiment, when the shift parameter includes a shift PRB density, the processor 1002 is specifically configured to:

[0151] when the shift PRB density is a first value, perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction using a first cyclic shift method to obtain the at least two CSI-RS resources;

[0152] when the shift PRB density is a second value, perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction using a second cyclic shift method to obtain the at least two CSI-RS resources.

[0153] In one embodiment, the first cyclic shift method includes a third cyclic shift method and a fourth cyclic shift method; the processor 1002 is specifically configured to:

[0154] determine the bandwidth configuration state of the CSI-RS resource;

[0155] when the bandwidth configuration state of the CSI-RS resource represents a full bandwidth configuration, perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction using the third cyclic shift method to obtain the at least two CSI-RS resources;

[0156] When the bandwidth configuration state of the CSI-RS resource represents a non-full bandwidth configuration, perform a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times using the fourth cyclic shift method to obtain the at least two CSI-RS resources.

[0157] It should be noted that: The specific processing procedures of the communication interface 1001 and the processor 1002 can be understood by referring to the above signal sending method.

[0158] Of course, in actual application, each component in the network device 1000 is coupled together through the bus system 1004. It can be understood that the bus system 1004 is used to realize the connection and communication between these components. In addition to the data bus, the bus system 1004 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clear illustration, in Figure 10 all kinds of buses are labeled as the bus system 1004.

[0159] The memory 1003 in the embodiments of the present application is used to store various types of data to support the operation of the network device 1000. Examples of these data include: any computer program for operating on the network device 1000.

[0160] The signal sending method disclosed in the above embodiments of the present application can be applied to the processor 1002 or implemented by the processor 1002. The processor 1002 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above signal sending method can be completed by the integrated logic circuit in the hardware of the processor 1002 or in the form of software instructions. The above-mentioned processor 1002 may be a general-purpose processor, a digital signal processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 1002 can implement or execute the various signal sending methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. Combining the steps of the signal sending method disclosed in the embodiments of the present application, it can be directly embodied as being executed by the hardware decoding processor, or executed by a combination of the hardware and software modules in the decoding processor. The software module may be located in the storage medium, and this storage medium is located in the memory 1003. The processor 1002 reads the information in the memory 1003 and combines its hardware to complete the steps of the foregoing signal sending method.

[0161] In an exemplary embodiment, the network device 1000 may be implemented by one or more application specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontroller units (MCUs), microprocessors, or other electronic components, and is used to execute the foregoing signal sending method.

[0162] It can be understood that the memory 1003 in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a ferromagnetic random access memory (FRAM), a flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM); the magnetic surface memory can be a disk memory or a tape memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), synchronous static random access memory (SSRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), sync link dynamic random access memory (SLDRAM), and direct rambus random access memory (DRRAM).The memory 1003 described in the embodiments of the present application is intended to include, but is not limited to, these and any other suitable types of memories.

[0163] In an exemplary embodiment, the embodiments of the present application also provide a storage medium, namely a computer storage medium, specifically a computer-readable storage medium, such as a memory 1003 that stores a computer program. The above computer program can be executed by a processor 1002 in a network device 1000 to complete the steps of the signal sending method described in the foregoing embodiments of the present application. Among them, the computer-readable storage medium can be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface memory, optical disc, or CD-ROM.

[0164] It should be noted that: "first", "second", "third", etc. are used to distinguish similar objects and do not necessarily describe a specific order or sequence.

[0165] In addition, the technical solutions described in the embodiments of the present application can be arbitrarily combined without conflict.

[0166] As described above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present application, and all of them should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A signal transmission method, characterized in that, applied to a network device, the method includes: configuring a channel state information reference signal (CSI-RS) resource set for a target cell; wherein, the target cell represents a cell corresponding to radio frequency combination of at least two radio remote units (RRUs) of the network device; the CSI-RS resource set includes at least two CSI-RS resources, and the basic sequences of the at least two CSI-RS resources are the same; sending the at least two CSI-RS resources to a user equipment (UE); the at least two CSI-RS resources are used for the UE to measure the corresponding reference signal received power (RSRP) to obtain a measurement result, and the measurement result is used to reflect the coverage relationship between the UE and the RRU.

2. The method according to claim 1, characterized in that, the configuring the CSI-RS resource set for the target cell includes: configuring the time domain position of a single-port CSI-RS resource to be the same orthogonal frequency division multiplexing (OFDM) symbol; configuring the frequency domain position of the single-port CSI-RS resource to be continuously distributed in sequence in the frequency domain within the same physical resource block (PRB).

3. The method according to claim 1, characterized in that, the method further includes: generating a first CSI-RS resource sequence; the first CSI-RS resource sequence represents the basic sequence for cyclic shift; performing a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times to obtain the at least two CSI-RS resources; the number of the at least two CSI-RS resources matches the target number of times.

4. The method according to claim 3, characterized in that, the network device further includes a baseband unit, and the first CSI-RS resource sequence is generated by the baseband unit based on a pseudo-random sequence when it is determined that the CSI-RS resource type meets a first condition.

5. The method according to claim 4, characterized in that, the method further includes: when the CSI-RS resource type is a single-port CSI-RS resource selected from a set position, determining that the CSI-RS resource type meets the first condition.

6. The method according to claim 3, characterized in that, the network device further includes an extension unit and a baseband unit, and the performing a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times to obtain the at least two CSI-RS resources includes: the extension unit obtains a shift parameter sent by the baseband unit; the shift parameter includes at least one of the following: symbol shift number indication; shift start physical resource block (PRB); shift PRB length; shift PRB density; the extension unit performs a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction based on the shift parameter to obtain the at least two CSI-RS resources.

7. The method according to claim 6, characterized in that, the extension unit obtaining the shift parameter sent by the baseband unit includes: Obtain the shift parameter sent by the baseband unit of the network device through a first interface; the first interface is an interface provided between the baseband unit and the extension unit.

8. The method according to claim 6, wherein, when the shift parameter includes a shifted PRB density, the extension unit performs a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction for a target number of times based on the shift parameter to obtain the at least two CSI-RS resources, including: when the shifted PRB density is a first value, performing a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction by using a first cyclic shift method to obtain the at least two CSI-RS resources; when the shifted PRB density is a second value, performing a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction by using a second cyclic shift method to obtain the at least two CSI-RS resources.

9. The method according to claim 8, wherein, the first cyclic shift method includes a third cyclic shift method and a fourth cyclic shift method; the performing a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction by using the first cyclic shift method to obtain the at least two CSI-RS resources includes: determining a bandwidth configuration state of the CSI-RS resource; when the bandwidth configuration state of the CSI-RS resource represents full-bandwidth configuration, performing a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction by using the third cyclic shift method to obtain the at least two CSI-RS resources; when the bandwidth configuration state of the CSI-RS resource represents non-full-bandwidth configuration, performing a cyclic shift operation on the first CSI-RS resource sequence in the frequency domain direction by using the fourth cyclic shift method to obtain the at least two CSI-RS resources.

10. A signal transmission device, wherein, applied to a network device, including: a configuration unit, configured to configure a channel state information reference signal CSI-RS resource set for a target cell; wherein, the target cell represents a cell corresponding to radio frequency combination of at least two remote radio units RRU of the network device; the CSI-RS resource set includes at least two CSI-RS resources, and the base sequences of the at least two CSI-RS resources are the same; a transmission unit, configured to transmit the at least two CSI-RS resources to a user equipment UE; the at least two CSI-RS resources are used for the UE to measure a corresponding reference signal received power RSRP to obtain a measurement result, and the measurement result is used to reflect a coverage relationship between the UE and the RRU.

11. A network device, wherein, including: a processor and a memory for storing a computer program that can run on the processor; Wherein, when the processor is used to run the computer program, it executes the steps of the method according to any one of claims 1 to 9.

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

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