A signal processing method, multi-stage distributed antenna system and storage medium

Abstract

An embodiment of the present invention discloses a signal processing method applied to a multi-stage distributed antenna system. The multi-stage distributed antenna system includes: a baseband pool and at least one radio remote unit, wherein the at least one radio remote unit is divided into at least one level. The method includes: a first radio remote unit processes a received uplink signal according to a preset merging strategy to obtain a first signal; wherein the first radio remote unit is a radio remote unit of any level; and the first radio remote unit uploads the first signal to the baseband pool.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a signal processing method, a multi-stage distributed antenna system and a storage medium. Background Art

[0002] Currently, distributed base stations typically utilize a baseband processing unit (BBU) and a radio remote unit (RRU). The BBU and RRU are connected by optical fiber, with the BBU responsible for baseband processing and the RRU for mid-range radio frequency processing. The optical fiber transmits the baseband time-domain signals.

[0003] In existing technologies, one BBU and one RRU serve a single cell, with little inter-cell coordination. With the advent of array antennas, the RRU needs to process an increasing number of RF channels, and the amount of signals required to be transmitted over optical fibers is also increasing. Furthermore, to improve the user experience at the cell edge and with the rise of user-centricity, a baseband pool consisting of multiple BBUs is often used to centrally process baseband signals. This means that the RRU needs to transmit a large number of signals to the baseband pool, which then performs various processing operations. However, existing distributed antenna systems have limited performance and cannot meet the requirements for processing and transmitting a large number of baseband and intermediate frequency signals. Summary of the Invention

[0004] In order to solve the existing technical problems, the embodiments of the present invention hope to provide a signal processing method, a multi-stage distributed antenna system and a storage medium. Signal processing is performed based on the constructed multi-stage distributed antenna system, which can reduce the signal transmission volume and meet the needs of large-scale networks.

[0005] To achieve the above-mentioned purpose, the technical solution of the embodiment of the present invention is implemented as follows:

[0006] An embodiment of the present invention provides a signal processing method applied to a multi-stage distributed antenna system, wherein the multi-stage distributed antenna system includes: a baseband pool and at least one remote radio unit, wherein the at least one remote radio unit is divided into at least one level, and the method includes:

[0007] The first remote radio unit combines the received uplink signals according to a preset combining strategy to obtain a first signal; wherein the first remote radio unit is a remote radio unit of any level;

[0008] The first radio remote unit uploads the first signal to the baseband pool.

[0009] In the above solution, after obtaining the second signal, the method further includes:

[0010] The first remote radio unit performs space division performance evaluation on the uplink signal according to a preset space division performance evaluation strategy to obtain space division performance evaluation information;

[0011] The first radio remote unit uploads the space division performance evaluation information to the baseband pool.

[0012] In the above solution, when the first remote radio unit is not at the lowest level, the method further includes:

[0013] The first remote radio unit performs weighted processing on the received downlink signal according to a preset weighting strategy to obtain a second signal;

[0014] The first remote radio unit sends the second signal to a second remote radio unit; wherein the second remote radio unit is a next-level remote radio unit directly connected to the first remote radio unit.

[0015] In the above solution, the first remote radio unit combines the received uplink signals according to a preset combining strategy to obtain the first signal, including:

[0016] The first radio remote unit determines the interference value between the uplink signals according to a preset interference determination method;

[0017] The first remote radio unit determines an uplink weight calculation method according to an interference value between the uplink signals;

[0018] The first remote radio unit calculates the combined weight according to the uplink weight calculation method;

[0019] The first remote radio unit combines the uplink signals according to the combining weight to obtain the first signal.

[0020] In the above solution, the first remote radio unit performs weighted processing on the received downlink signal according to a preset weighting strategy to obtain a second signal. The method further includes:

[0021] The first radio remote unit determines the interference value between the downlink signals according to a preset interference determination method;

[0022] The first remote radio unit determines a downlink weight calculation method according to an interference value between the downlink signals;

[0023] The first remote radio unit calculates a weighted weight according to the downlink weight calculation method;

[0024] The first remote radio unit weights the downlink signal according to the weighted value to obtain the second signal.

[0025] In the above solution, the first remote radio unit determines an uplink weight calculation method according to the interference value between the uplink signals, including:

[0026] When the interference value between the uplink signals is greater than or equal to a preset interference threshold, the first remote radio unit determines the first weight calculation method as the uplink weight calculation method;

[0027] When the interference value between the uplink signals is less than the preset interference threshold, the first remote radio unit determines the second weight calculation method as the uplink weight calculation method.

[0028] In the above solution, the first remote radio unit determines a downlink weight calculation method according to the interference between the downlink signals, including:

[0029] When the interference value between the downlink signals is greater than or equal to a preset interference threshold, the first remote radio unit determines the third weight calculation method as the downlink weight calculation method;

[0030] When the interference value between the downlink signals is less than the preset interference threshold, the first remote radio unit determines the fourth weight calculation method as the downlink weight calculation method.

[0031] An embodiment of the present invention provides a multi-stage distributed antenna system, comprising: a baseband pool and at least one first radio remote unit, wherein:

[0032] The first remote radio unit is configured to combine the received uplink signals according to a preset weighted combining strategy to obtain a first signal; and upload the first signal to the baseband pool; wherein the first remote radio unit is a remote radio unit of any level;

[0033] The baseband pool is configured to receive the first signal.

[0034] In the above system, the first radio remote unit is further configured to perform a space division performance evaluation on the uplink signal according to a preset space division performance evaluation strategy to obtain space division performance evaluation information; and upload the space division performance evaluation information to the baseband pool;

[0035] The baseband pool is further configured to receive the space division performance evaluation information.

[0036] In the above system, when the first remote radio unit is not the lowest level, the system further includes: a second remote radio unit; wherein the second remote radio unit is a next-level remote radio unit directly connected to the first remote radio unit;

[0037] The first remote radio unit is further configured to perform weighted processing on the received downlink signal according to a preset weighting strategy to obtain a second signal; and send the second signal to the second remote radio unit;

[0038] The second radio remote unit is configured to receive the second signal.

[0039] An embodiment of the present invention provides a first radio remote unit, the first radio remote unit comprising: a processor, a memory, and a communication bus;

[0040] The communication bus is used to realize the connection and communication between the processor and the memory;

[0041] The processor is used to implement the signal processing program stored in the memory to implement the above-mentioned signal processing method.

[0042] An embodiment of the present invention further provides a computer-readable storage medium, which stores one or more programs. The one or more programs can be executed by one or more processors to implement the above-mentioned signal processing method.

[0043] Thus, in the technical solution of the embodiment of the present invention, the first remote radio unit combines and processes the received uplink signals according to a preset combining strategy to obtain a first signal; wherein the first remote radio unit is a remote radio unit of any level; and the first remote radio unit uploads the first signal to the baseband pool. In other words, in the technical solution of the embodiment of the present invention, the first remote radio unit has the relevant signal processing capabilities and can perform signal processing on the received signals, thereby reducing the amount of data that needs to be sent to the baseband pool and meeting the needs of large-scale networks. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of an exemplary multi-stage distributed antenna system provided by an embodiment of the present invention;

[0045] Figure 2 A flow chart of a signal processing method provided by an embodiment of the present invention Figure 1 ;

[0046] Figure 3 A schematic diagram of a flow chart for combining uplink signals provided in an embodiment of the present invention;

[0047] Figure 4 A schematic diagram of an exemplary uplink signal combination provided by an embodiment of the present invention;

[0048] Figure 5 An exemplary signal transmission diagram provided by an embodiment of the present invention;

[0049] Figure 6 A flow chart of a signal processing method provided by an embodiment of the present invention Figure 2 ;

[0050] Figure 7 A schematic diagram of a flow chart for weighted processing of a downlink signal provided by an embodiment of the present invention;

[0051] Figure 8 A schematic diagram of an exemplary weight distribution provided in an embodiment of the present invention;

[0052] Figure 9 A schematic structural diagram of a multi-stage distributed antenna system provided by an embodiment of the present invention;

[0053] Figure 10 A schematic structural diagram of a first radio remote unit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0055] In an embodiment of the present invention, a multi-level distributed antenna system is provided. The multi-level distributed antenna system includes a baseband pool and at least one remote radio unit (RRU). The RRU can be divided into multiple levels. The specific number of RRUs and the RRU level division are not limited in this embodiment.

[0056] It should be noted that in the embodiment of the present invention, the number of next-stage remote radio units connected to each remote radio unit of the multi-stage distributed antenna system is flexible and variable, and the specific connection method of the remote radio units is not limited in the embodiment of the present invention.

[0057] Figure 1 Schematic diagram of an exemplary multi-stage distributed antenna system provided by an embodiment of the present invention. Figure 1 As shown, the multi-stage distributed antenna system includes: a baseband pool, two first-stage remote radio units (RRUs), and three second-stage remote radio units (RRUs). The two first-stage RRUs are directly connected to the baseband pool, one second-stage RRU is directly connected to one first-stage RRU, and two second-stage RRUs are directly connected to another first-stage RRU.

[0058] It should be noted that, in the embodiments of the present invention, each level of the remote radio unit can perform signal processing on the received uplink signal or downlink signal, transmit the processed signal to the remote radio unit of the previous level, and finally upload it to the baseband pool, or send the processed signal to the remote radio unit of the next level. Among them, for the uplink signal, the remote radio unit is also required to perform spatial separation performance evaluation based on the received uplink signal, obtain spatial separation performance evaluation information, and transmit it to the remote radio unit of the previous level, and finally upload it to the baseband pool. The baseband pool performs corresponding operations based on the processed uplink signal and spatial separation performance evaluation information. For the downlink signal, the processed downlink signal is continuously transmitted to the remote radio unit of the next level, and finally fed back to the user to provide services to the user.

[0059] Based on the above multi-stage distributed antenna system, a signal processing method at each remote radio unit level is proposed.

[0060] Example 1

[0061] An embodiment of the present invention provides a signal processing method applied to a multi-stage distributed antenna system. Figure 2 A flow chart of a signal processing method provided by an embodiment of the present invention Figure 1 ,like Figure 2 As shown, the method may include:

[0062] S201: A first remote radio unit combines received uplink signals according to a preset combining strategy to obtain a first signal. The first remote radio unit is a remote radio unit of any level.

[0063] In the embodiment of the present invention, the first remote radio unit may receive an uplink signal and then combine the uplink signals, where the combined uplink signal is the first signal.

[0064] It should be noted that, in an embodiment of the present invention, the first radio remote unit may receive multiple uplink signals, and the uplink signal may be obtained by uploading from a next-level radio remote unit directly connected to the first radio remote unit, or may be obtained by transmitting from a radio remote unit of the same level directly connected to the first radio remote unit. The specific uplink signal is not limited in the embodiment of the present invention.

[0065] Specifically, in an embodiment of the present invention, Figure 3 A schematic diagram of a process for combining uplink signals provided by an embodiment of the present invention. Figure 3 As shown, it mainly includes the following steps:

[0066] S301: A first remote radio unit determines an interference value between uplink signals according to a preset interference determination method.

[0067] It should be noted that, in the embodiment of the present invention, the preset interference determination method may be pre-set autonomously in the first remote radio unit, and the embodiment of the present invention does not limit the specific preset interference determination method.

[0068] It is understandable that the preset interference determination method may be to detect signal characteristics of uplink signals, such as noise and other information, so as to measure the interference value between uplink signals.

[0069] It is understandable that the interference between the first signals is actually the impact between uplink signals. For example, when the first remote radio frequency unit receives a signal sent by user 1 and a signal sent by user 2, that is, the first remote radio frequency unit receives two uplink signals, therefore, there is interference between the uplink signals. When the first remote radio frequency unit receives a signal sent by user 1 or a signal sent by user 2, that is, the first remote radio frequency unit receives a single uplink signal, therefore, there is no interference.

[0070] S302: The first remote radio unit determines an uplink weight calculation method according to an interference value between uplink signals.

[0071] In the embodiment of the present invention, the first remote radio unit determines the uplink weight calculation method according to the interference value between uplink signals.

[0072] Specifically, in an embodiment of the present invention, the first radio frequency remote unit determines the uplink weight calculation method based on the interference value between the uplink signals, including: when the interference value between the uplink signals is greater than or equal to the preset interference threshold, the first radio frequency remote unit determines the first weight calculation method as the uplink weight calculation method; when the interference value between the uplink signals is less than the preset interference threshold, the first radio frequency remote unit determines the second weight calculation method as the uplink weight calculation method.

[0073] It should be noted that, in the embodiment of the present invention, the first remote radio unit stores a preset interference threshold, and the specific preset interference threshold is not limited in the embodiment of the present invention.

[0074] It should be noted that, in the embodiment of the present invention, a weight calculation method applicable to uplink signals is preset in the first remote radio unit, and the embodiment of the present invention does not limit the specific weight calculation method applicable to uplink signals.

[0075] Exemplarily, in an embodiment of the present invention, the weight calculation methods preset in the first remote radio unit and applicable to uplink signals include: maximum ratio combining and minimizing mean square error, and the preset interference threshold is A. If the interference value between the uplink signals is greater than or equal to A, minimizing mean square error is determined as the uplink weight calculation method, that is, minimizing mean square error is the first weight calculation method, which is applicable to situations where the interference between the uplink signals is large. If the interference value between the uplink signals is less than A, maximum ratio combining is determined as the uplink weight calculation method, that is, maximum ratio combining is the second weight calculation method, which is applicable to situations where the interference between the uplink signals is small.

[0076] It can be understood that, in the prior art, the merging and processing of the uplink signals received by the first radio remote unit needs to be performed by the baseband pool, while in an embodiment of the present invention, the first radio remote unit can realize the merging and processing of the received uplink signals without the need for centralized processing in the baseband pool.

[0077] S303: The first remote radio unit calculates a combining weight according to an uplink weight calculation method.

[0078] In the embodiment of the present invention, after the first remote radio unit determines the uplink weight calculation method, the combined weight may be calculated according to the uplink weight calculation method.

[0079] It should be noted that, in the embodiment of the present invention, the combining weight is used to combine uplink signals.

[0080] Specifically, in an embodiment of the present invention, when the uplink weight calculation method determined by the first remote radio unit is the first weight calculation method, the first remote radio unit calculates the combined weight according to the first weight calculation method. When the uplink weight calculation method determined by the first remote radio unit is the second weight calculation method, the first remote radio unit calculates the combined weight according to the second weight calculation method.

[0081] Exemplarily, when the uplink weight calculation method is to minimize mean square error, the first remote radio unit calculates the combining weight according to the minimum mean square error. When the uplink weight calculation method is maximum ratio combining, the first remote radio unit calculates the combining weight according to maximum ratio combining. Both minimum mean square error and maximum ratio combining are existing technologies and are not further described here.

[0082] S304: The first remote radio unit combines the uplink signals according to the combining weight to obtain a first signal.

[0083] In the embodiment of the present invention, after determining the combining weight, the first remote radio unit combines the uplink signals according to the combining weight, thereby obtaining the first signal.

[0084] It will be appreciated that in this embodiment of the present invention, when the first remote radio unit receives an uplink signal, it combines the uplink signal to obtain a first signal. Compared to the uplink signal, the first signal has a different spatial dimension, reducing the data volume. Therefore, uploading the first signal by the first remote radio unit significantly reduces the amount of uplink transmission data compared to directly uploading the uplink signal.

[0085] Figure 4 A schematic diagram of an exemplary uplink signal combination provided by an embodiment of the present invention. Figure 4 As shown, the first remote radio unit receives uplink signals through four radio antennas, specifically including the signal sent by user 1 and the signal sent by user 2. In other words, the first remote radio unit actually receives four streams of data through the four radio antennas. These four streams of data can constitute the signal sent by user 1 and the signal sent by user 2. Therefore, the first remote radio unit combines the four streams of data to obtain two streams of data, which effectively reduces the amount of data for subsequent uplink transmission.

[0086] S202: The first radio remote unit uploads the first signal to a baseband pool.

[0087] In an embodiment of the present invention, the first radio remote unit combines and processes the uplink signals to obtain a first signal, and then uploads the first signal to the baseband pool. The baseband pool may perform preset physical layer sublayer processing on the first signal.

[0088] It can be understood that in an embodiment of the present invention, if the first radio remote unit is directly connected to the baseband pool, the first signal can be directly uploaded to the baseband pool. If the first radio remote unit is not directly connected to the baseband pool, the first signal can be first uploaded to the upper-level radio remote unit directly connected to itself, and the first signal can be finally uploaded to the baseband pool through continuous uplink transmission.

[0089] It can be understood that in the embodiment of the present invention, since the first signal is a signal obtained after the uplink signal is combined and processed, its data volume is much smaller than the data volume of the uplink signal. Therefore, the amount of data that the first radio frequency remote unit needs to upload to the baseband pool is reduced.

[0090] It should be noted that, in the embodiment of the present invention, the baseband pool performs physical layer sub-layer processing on the second signal, which may include modulation and demodulation, encoding and decoding, etc. The embodiment of the present invention does not limit the specific physical layer sub-layer processing.

[0091] It should be noted that, in the embodiment of the present invention, after step S201, the first remote radio unit may further perform space division performance evaluation on the uplink signal according to a preset space division performance evaluation strategy to obtain space division performance evaluation information.

[0092] In the embodiment of the present invention, the preset space division performance evaluation strategy is actually to evaluate the spatial correlation between uplink signals. The embodiment of the present invention does not limit the specific preset space division performance evaluation strategy.

[0093] Optionally, in an embodiment of the present invention, the preset space division performance evaluation strategy can be evaluated by the presence or absence of a signal, or by a spatial correlation inequality.

[0094] Illustratively, the first radio remote unit may evaluate the space division performance according to the presence or absence of a signal. Figure 5 This is an exemplary signal transmission diagram provided by an embodiment of the present invention. Figure 5 As shown in the figure, user 1 sends a signal to RRU1 and RRU3, but RRU2 cannot receive it due to its distance and excessive path loss. Similarly, user 2 sends a signal to RRU2 and RRU3, but RRU1 does not receive it. Therefore, only the signal sent by user 1 or user 2 is transmitted to RRU1 and RRU2. In other words, the spatial correlation between the signals sent by user 1 and user 2 is low. However, both signals are transmitted to RRU3, with high spatial correlation. The signals sent by user 1 and user 2 are both uplink signals.

[0095] Exemplarily, the first radio remote unit can evaluate the space division performance according to the spatial correlation inequality, that is, inequality (1). Inequality (1) is:

[0096]

[0097] The first radio remote unit manages N radio antennas, namely An, n = 0, 1, ..., N-1, where N is a natural number greater than or equal to 1, R 1,n is the signal sent by user 1 received by RF antenna An, R 2,n is the signal sent by user 2 received by RF antenna An, th is a threshold constant, and th can be set between 0 and 1. The smaller the th value is, the lower the spatial correlation between the uplink signals that satisfy inequality (1). The specific value of th is not limited in this embodiment of the present invention. The signal sent by user 1 and the signal sent by user 2 are both uplink signals. That is, when inequality (1) holds, the spatial correlation between the uplink signals received by the first radio remote unit is low.

[0098] It should be noted that, in the embodiment of the present invention, since the signals received by the first radio remote unit are all uplink signals, that is, the number of uplink signals may be large, the first radio remote unit performs space division performance evaluation on the uplink signals according to the preset space division performance evaluation strategy, which is actually to evaluate the spatial correlation between the two uplink signals, and finally constitute the space division performance evaluation information.

[0099] It can be understood that the space division performance evaluation information obtained by the first radio frequency remote unit will eventually be uploaded to the baseband pool, and there is no need to upload other redundant information to the baseband pool, which reduces the amount of uploaded data. The baseband pool does not need to perform a large amount of analysis and evaluation, and can make the final decision directly based on the space division performance evaluation information.

[0100] Specifically, in the embodiment of the present invention, after receiving the space division performance evaluation information, the baseband pool may determine the space allocation decision according to the space division performance evaluation information.

[0101] It is understandable that in the prior art, signal processing of the uplink signal to obtain the first signal, as well as spatial performance evaluation of the uplink signal and obtaining spatial performance evaluation information, are all performed centrally in the baseband pool. In the present invention, however, both signal processing and spatial performance evaluation are performed by the first remote radio unit. Therefore, the baseband pool can directly obtain relevant information, meaning that the baseband pool can simply make decisions. During this process, because the first remote radio unit processes the uplink signal, the amount of data transmitted between the first remote radio unit and the baseband pool is reduced.

[0102] It should be noted that, in the embodiment of the present invention, when the first remote radio unit is not at the lowest level, the first remote radio unit may further process the downlink signal and send it down. Figure 6 A flow chart of a signal processing method provided by an embodiment of the present invention Figure 2 , including steps S601 to S602, the specific steps are as follows:

[0103] S601: A first remote radio unit performs weighted processing on a received downlink signal according to a preset weighting strategy to obtain a second signal.

[0104] In the embodiment of the present invention, the first remote radio unit may receive a downlink signal and then perform weighted processing on the downlink signal, where the downlink signal after weighted processing is the second signal.

[0105] It should be noted that, in the embodiment of the present invention, when the first remote radio unit is at the lowest level, that is, when there is no next-level remote radio unit connected to the first remote radio unit, the first remote radio unit directly sends the received downlink signal to the user terminal.

[0106] Specifically, in an embodiment of the present invention, Figure 7 A schematic diagram of a flow chart for weighted processing of downlink signals provided in an embodiment of the present invention. Figure 7 As shown, it mainly includes the following steps:

[0107] S701: A first remote radio unit determines an interference value between downlink signals according to a preset interference determination method.

[0108] In an embodiment of the present invention, when the first remote radio unit receives a downlink signal, it may determine the interference value between the downlink signals according to a preset interference determination method.

[0109] It should be noted that, in this embodiment of the present invention, the method for the first remote radio unit to determine the interference value between downlink signals is the same as the method for determining the interference value between uplink signals, the only difference being whether the determination is made on uplink signals or downlink signals. Step S301 already describes how to determine the interference value between uplink signals, and therefore, this description is omitted here.

[0110] S702: The first remote radio unit determines a downlink weight calculation method according to an interference value between downlink signals.

[0111] In the embodiment of the present invention, when the first remote radio unit receives a downlink signal, the downlink weight calculation method is determined according to the interference value between the downlink signals.

[0112] Specifically, in an embodiment of the present invention, the first radio remote unit determines the downlink weight calculation method based on the interference size between the downlink signals, including: when the interference between the downlink signals is greater than or equal to the preset interference threshold, the first radio remote unit determines the third weight calculation method as the downlink weight calculation method; when the interference between the downlink signals is less than the preset interference threshold, the first radio remote unit determines the fourth weight calculation method as the downlink weight calculation method.

[0113] It should be noted that, in the embodiment of the present invention, the first remote radio unit stores a preset interference threshold, and the specific preset interference threshold is not limited in the embodiment of the present invention.

[0114] It should be noted that, in the embodiment of the present invention, a weight calculation method applicable to downlink signals is preset in the first remote radio unit, and the embodiment of the present invention does not limit the specific weight calculation method applicable to downlink signals.

[0115] Exemplarily, in an embodiment of the present invention, the weight calculation methods preset in the first remote radio unit and applicable to downlink signals include: maximum ratio transmission and zero forcing, and the preset interference threshold is B. If the interference value between the downlink signals is greater than or equal to B, zero forcing is determined as the downlink weight calculation method, i.e., zero forcing is the third weight calculation method, which is applicable to situations where the interference between the downlink signals is large. If the interference value between the downlink signals is less than B, maximum ratio transmission is determined as the downlink weight calculation method, i.e., maximum ratio transmission is the fourth weight calculation method, which is applicable to situations where the interference between the downlink signals is small.

[0116] S703: The first remote radio unit calculates a weighted weight according to a downlink weight calculation method.

[0117] In the embodiment of the present invention, after the first remote radio unit determines the downlink weight calculation method, it can calculate the combined weight according to the downlink weight calculation method.

[0118] It should be noted that, in the embodiment of the present invention, the weighted value is used to perform weighted shaping on the downlink signal.

[0119] Specifically, in an embodiment of the present invention, when the downlink weight calculation method determined by the first remote radio unit is the third weight calculation method, the first remote radio unit calculates the weighted weight according to the third weight calculation method. When the downlink weight calculation method determined by the first remote radio unit is the fourth weight calculation method, the first remote radio unit calculates the weighted weight according to the fourth weight calculation method.

[0120] For example, when the downlink weight calculation method is zero forcing, the first remote radio unit calculates the weighted weight according to zero forcing. When the downlink weight calculation method is maximum ratio transmission, the first remote radio unit calculates the weighted weight according to maximum ratio transmission. Zero forcing and maximum ratio transmission are both existing technologies and are not further described here.

[0121] S704: The first remote radio unit weights the downlink signal according to the weighted value to obtain a second signal.

[0122] In the embodiment of the present invention, after determining the weighted value, the first radio remote unit weights the downlink signal according to the weighted value, thereby obtaining the second signal.

[0123] It will be appreciated that in this embodiment of the present invention, when the first remote radio unit receives a downlink signal, it performs weighted processing on the downlink signal to obtain a second signal. Compared to the downlink signal, the second signal has a different spatial dimension, reducing the data volume. Therefore, the first remote radio unit sending the second signal significantly reduces the amount of downlink transmission data compared to directly sending the downlink signal.

[0124] It should be noted that in the embodiments of the present invention, the determination of the uplink weight calculation method or the downlink weight calculation method, as well as the calculation of the combined weight or weighted weight, can be implemented not only by the first remote radio frequency unit, but also by the upper-level remote radio frequency unit directly connected to the first remote radio frequency unit. This is to address the situation where the processing capacity of the first remote radio frequency unit is insufficient. The upper-level remote radio frequency unit sends the calculated combined weight or weighted weight to the first remote radio frequency unit, and the first remote radio frequency unit then merges or weights the first signal. If the first remote radio frequency unit is the highest-level remote radio frequency unit directly connected to the baseband pool, the baseband pool can also calculate and send the weight. The method for calculating the weight by the baseband pool is the same as the method for calculating the weight by the first remote radio frequency unit.

[0125] Figure 8 The following is a schematic diagram of an exemplary weight distribution provided by an embodiment of the present invention. Figure 8 As shown, in the three-level distributed antenna system, the weights that need to be combined or weighted by the second-level remote radio units are uniformly calculated and issued by the first-level remote radio units.

[0126] S602: The first remote radio unit sends the second signal to the second remote radio unit; wherein the second remote radio unit is a next-level remote radio unit directly connected to the first remote radio unit.

[0127] In the embodiment of the present invention, after obtaining the second signal, the first remote radio unit sends the second signal to the second remote radio unit; wherein the second remote radio unit is a next-level remote radio unit directly connected to the first remote radio unit.

[0128] It is understandable that, in the embodiment of the present invention, the second remote radio unit may perform further signal transmission based on the received second signal. The specific operations performed by the second remote radio unit are not limited in the embodiment of the present invention.

[0129] An embodiment of the present invention provides a signal processing method for a multi-level distributed antenna system. A first remote radio frequency unit (RRU) processes a received uplink signal according to a preset combining strategy to obtain a first signal. The first RRU, which can be a RRU at any level, uploads the first signal to a baseband pool. Specifically, in the technical solution of this embodiment of the present invention, the first RRU is equipped with signal processing capabilities and can perform signal processing and spatial division performance evaluation on the received signal, thereby reducing the amount of data required to be sent to the baseband pool and meeting the requirements of large-scale networks.

[0130] Example 2

[0131] Figure 9FIG1 is a structural diagram of a multi-stage distributed antenna system provided by an embodiment of the present invention. Figure 9 As shown, the multi-stage distributed antenna system includes: a baseband pool 901 and at least one first radio remote unit, wherein:

[0132] The first remote radio unit 902 is configured to combine the received uplink signals according to a preset combining strategy to obtain a first signal; and upload the first signal to the baseband pool 901; wherein the first remote radio unit 902 is a remote radio unit of any level;

[0133] The baseband pool 901 is configured to receive the first signal.

[0134] Optionally, the first radio remote unit 902 is further configured to perform a space division performance evaluation on the uplink signal according to a preset space division performance evaluation strategy to obtain space division performance evaluation information; and upload the space division performance evaluation information to the baseband pool 901;

[0135] The baseband pool 901 is further configured to receive the space division performance evaluation information.

[0136] Optionally, when the first remote radio unit is not at the lowest level, the system further includes: a second remote radio unit 903; wherein the second remote radio unit 903 is a next-level remote radio unit directly connected to the first remote radio unit 902;

[0137] The first remote radio unit 902 is further configured to perform weighted processing on the received downlink signal according to a preset weighting strategy to obtain a second signal; and send the second signal to the second remote radio unit 903;

[0138] The second radio remote unit 903 is configured to receive the second signal.

[0139] An embodiment of the present invention provides a multi-level distributed antenna system in which a first remote radio unit (RRU) processes received uplink signals according to a preset combining strategy to obtain a first signal. The first RRU, which can be a RRU at any level, uploads the first signal to a baseband pool. Specifically, in the technical solution of this embodiment of the present invention, the first RRU possesses signal processing capabilities and can perform signal processing and spatial division performance evaluation on received signals, thereby reducing the amount of data required to be sent to the baseband pool and meeting the requirements of large-scale networks.

[0140] Figure 10 This is a structural diagram of a first radio remote unit provided by an embodiment of the present invention. Figure 10As shown, the first radio remote unit includes: a processor 1001, a memory 1002 and a communication bus 1003;

[0141] The communication bus 1003 is used to realize the connection and communication between the processor 1001 and the memory 1002;

[0142] The processor 1001 is configured to implement the signal processing program stored in the memory 1002 to implement the above-mentioned signal processing method.

[0143] An embodiment of the present invention further provides a computer-readable storage medium storing one or more programs, wherein the one or more programs can be executed by one or more processors to implement the above-mentioned signal processing method. The computer-readable storage medium can be a volatile memory (volatile memory), such as a random-access memory (RAM); or a non-volatile memory (non-volatile memory), such as a read-only memory (ROM), a flash memory, a hard disk drive (HDD), or a solid-state drive (SSD); or it can be a respective device including one or any combination of the above-mentioned memories, such as a mobile phone, a computer, a tablet device, a personal digital assistant, etc.

[0144] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of hardware embodiments, software embodiments, or embodiments combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.

[0145] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable signal processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable signal processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0146] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable signal processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device that implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0147] These computer program instructions may also be loaded onto a computer or other programmable signal processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable device to implement the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0148] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A signal processing method, characterized in that: The method is applied to a multi-stage distributed antenna system, the multi-stage distributed antenna system comprising: a baseband pool and at least one remote radio unit, wherein the at least one remote radio unit is divided into at least one level, and the at least one remote radio unit comprises a second remote radio unit of a next level directly connected to the first remote radio unit. The method comprises: The first remote radio unit combines the received uplink signals according to a preset combining strategy to obtain a first signal; wherein the first remote radio unit is a remote radio unit of any level; The first remote radio unit performs a space division performance evaluation on the uplink signal according to a preset space division performance evaluation strategy to obtain space division performance evaluation information, wherein the preset space division performance evaluation strategy is a strategy for evaluating spatial correlation between uplink signals; The first radio remote unit uploads the first signal and the space division performance evaluation information to the baseband pool; The first remote radio unit performs weighted processing on the received downlink signal according to a preset weighting strategy to obtain a second signal; The first remote radio unit sends the second signal to the second remote radio unit.

2. The method according to claim 1, characterized in that The first remote radio unit combines the received uplink signals according to a preset combining strategy to obtain a first signal, including: The first radio remote unit determines the interference value between the uplink signals according to a preset interference determination method; The first remote radio unit determines an uplink weight calculation method according to an interference value between the uplink signals; The first remote radio unit calculates the combined weight according to the uplink weight calculation method; The first remote radio unit combines the uplink signals according to the combining weight to obtain the first signal.

3. The method according to claim 1, characterized in that The first remote radio unit performs weighted processing on the received downlink signal according to a preset weighting strategy to obtain a second signal, including: The first radio remote unit determines the interference value between the downlink signals according to a preset interference determination method; The first remote radio unit determines a downlink weight calculation method according to an interference value between the downlink signals; The first remote radio unit calculates a weighted weight according to the downlink weight calculation method; The first remote radio unit weights the downlink signal according to the weighted value to obtain the second signal.

4. The method according to claim 2, characterized in that The first remote radio unit determines an uplink weight calculation method according to the interference value between the uplink signals, including: In response to an interference value between the uplink signals being greater than or equal to a preset interference threshold, the first remote radio unit determines a first weight calculation mode as the uplink weight calculation mode; In response to the interference value between the uplink signals being less than the preset interference threshold, the first remote radio unit determines the second weight calculation mode as the uplink weight calculation mode.

5. The method according to claim 3, characterized in that The first remote radio unit determines a downlink weight calculation method according to the interference between the downlink signals, including: In response to an interference value between the downlink signals being greater than or equal to a preset interference threshold, the first remote radio unit determines a third weight calculation mode as the downlink weight calculation mode; In response to the interference value between the downlink signals being less than the preset interference threshold, the first remote radio unit determines a fourth weight calculation method as the downlink weight calculation method.

6. A multi-stage distributed antenna system, characterized in that: The multi-stage distributed antenna system includes: a baseband pool, at least one first remote radio unit and a second remote radio unit; wherein the second remote radio unit is a next-stage remote radio unit directly connected to the first remote radio unit, wherein: The first remote radio frequency unit is configured to combine the received uplink signals according to a preset combining strategy to obtain a first signal; the first remote radio frequency unit performs a spatial division performance evaluation on the uplink signal according to a preset spatial division performance evaluation strategy to obtain spatial division performance evaluation information, wherein the preset spatial division performance evaluation strategy is a strategy for evaluating spatial correlation between uplink signals; the first remote radio frequency unit is further configured to upload the first signal and the spatial division performance evaluation information to the baseband pool; wherein the first remote radio frequency unit is a remote radio frequency unit of any level; The baseband pool is configured to receive the first signal and the space division performance evaluation information; The first remote radio unit is further configured to perform weighted processing on the received downlink signal according to a preset weighting strategy to obtain a second signal; and send the second signal to the second remote radio unit; The second radio remote unit is configured to receive the second signal.

7. A first radio remote unit, characterized in that: The first radio remote unit includes: a processor, a memory and a communication bus; The communication bus is used to realize the connection and communication between the processor and the memory; The processor is configured to implement the signal processing program stored in the memory to implement the method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the method according to any one of claims 1 to 5.

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