CN113543302A

CN113543302A - Data transmission method and base station

Info

Publication number: CN113543302A
Application number: CN202110732082.9A
Authority: CN
Inventors: 邱明清; 符永逸; 卢会群
Original assignee: Guangzhou Huiruisitong Technology Co Ltd
Current assignee: Guangzhou Huiruisitong Technology Co Ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-10-22

Abstract

The invention is suitable for the technical field of wireless communication, and provides a data transmission method and a base station applying the method, wherein the method comprises the following steps: the method comprises the steps that an RHUB receives RE data issued by a baseband processing unit (BBU) and caches the RE data, wherein the RE data carries symbol numbers; the RHUB and RE data issued by the BBU synchronously generate a control signal, and the control signal has the same symbol number as the initial data of the RE data; and the RHUB controls the reading of the cached RE data based on the comparison between the control signal and the symbol number of the RE data, and sends the read RE data to a Remote Radio Unit (RRU) so as to align the time delay. The invention can solve the problem of time delay misalignment during the transmission between the existing BBU and the RRU, and improves the accuracy and the robustness of data transmission.

Description

Data transmission method and base station

Technical Field

The invention belongs to the technical field of wireless communication, and particularly relates to a data transmission method and a base station for use between a BBU (base band unit) and a RRU (remote radio unit).

Background

In an existing wireless communication system, an indoor Base Band Unit (BBU) and a Remote Radio Unit (RRU) are usually included, and communication between the BBU and the RRU often needs to perform corresponding processing on data. Taking frequency domain Resource (RE) data of an enhanced common radio interface, eCPRI, protocol for transmission as an example, when a BBU uses the eCPRI protocol to send RE data to an RRU, the RE data needs to perform Inverse Fast Fourier Transform (IFFT) and add a Cyclic Prefix (CP) to the transformed RE data, and the above processing needs a certain processing time, so that a certain time delay exists between the BBU and the RRU in the data transmission process, and the length of the time delay is related to the processing time needed for the data.

In the existing data transmission technology between the BBU and the RRU, under the conditions of complex structure, insufficient processing capacity or abnormity in the transmission process, RE data is easy to lose or overtime processing, and the like, so that time delay is not aligned.

Disclosure of Invention

In view of this, embodiments of the present invention provide a method and a base station for data transmission between a BBU and an RRU, so as to solve the problem of time delay misalignment of the existing data transmission technology between the BBU and the RRU.

A first aspect of an embodiment of the present invention provides a downlink data transmission method, including:

the radio remote hub RHUB receives RE data issued by a baseband processing unit BBU and caches the RE data, wherein the RE data carries a symbol number;

the RHUB and RE data issued by the BBU synchronously generate a control signal, and the control signal has the same symbol number as the initial data of the RE data;

and the RHUB controls the reading of the cached RE data based on the comparison between the control signal and the symbol number of the RE data, and sends the read RE data to a Remote Radio Unit (RRU) so as to align the time delay.

A second aspect of an embodiment of the present invention provides a radio remote hub RHUB, including:

the receiving module is used for receiving RE data issued by the baseband processing unit BBU;

a cache module, configured to cache the RE data, where the RE data carries a symbol number;

the control module is used for generating a control signal synchronously with RE data issued by the BBU, and the control signal has the same symbol number as the initial data of the RE data; the control module is further configured to control reading of the RE data based on a comparison of the control signal and a symbol number of the RE data;

and the sending module is used for sending the read RE data to a Remote Radio Unit (RRU) so as to align time delay. .

A third aspect of an embodiment of the present invention provides a base station, including: at least one BBU, at least one RHUB provided by the second aspect, and at least one RRU.

A fourth aspect of the embodiments of the present invention provides an uplink data transmission method, where a first RHUB and a second RHUB are cascaded between a BBU and an RRU; wherein the first RHUB is an upper link RHUB of the second RHUB;

the uplink data transmission method comprises the following steps:

if the first RHUB detects the cached first uplink data sent by the RRU, starting a waiting window;

and the first RHUB controls the combination of the first uplink data and the second uplink data based on whether the second uplink data uploaded by the second RHUB is received in the waiting window or not, and sends the first uplink data or the data obtained by combining the first uplink data and the second uplink data to the BBU so as to align time delay.

A fifth aspect of an embodiment of the present invention provides a base station, including: the RRU comprises at least one BBU, a first RHUB, an RRU connected with the first RHUB, a second RHUB and an RRU connected with the second RHUB; wherein the first RHUB is an upper link RHUB of the second RHUB;

the first RHUB is configured to start a waiting window if the cached first uplink data sent by the RRU is detected;

the first RHUB is configured to control, based on whether second uplink data uploaded by a second RHUB is received in the waiting window, combination of the first uplink data and the second uplink data, and send the first uplink data or data obtained by combining the first uplink data and the second uplink data to the BBU, so that time delays are aligned.

A sixth aspect of embodiments of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the method of the first aspect and/or the method of the fourth aspect.

The implementation of the data transmission method and the electronic equipment for the BBU and the RRU provided by the embodiment of the invention has the following beneficial effects that:

in the embodiment of the invention, in the process of executing the downlink service of sending data to the RRU by the BBU, the RE data sent to the RHUB by the BBU carries the symbol number, and when receiving the RE data sent by the BBU, the RHUB also generates the control signal synchronously with the RE data sent by the BBU, wherein the control signal has the same symbol number as the RE data. The RHUB identifies whether the time delay between the BBU and the RHUB is aligned by comparing whether the symbol numbers of the RE data and the control signal are consistent, controls reading of the cached RE data based on whether the time delay is aligned, and sends the read RE data to the RRU to align the time delay, so that the problem that the time delay is not aligned when the existing BBU and the RRU are transmitted is solved, and the accuracy and the robustness of data transmission are improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a conventional base station;

fig. 2 is a schematic diagram of timeslot matching according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a corresponding time slot when a downlink service is executed between a BBU and an RRU according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 5 is a flowchart of an implementation of a data transmission method applied between a BBU and an RRU according to a first embodiment of the present invention;

fig. 6 is a diagram illustrating initial RE data according to an embodiment of the present invention;

FIG. 7 is a diagram illustrating the comparison of the control signal and the initial RE data according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a process of comparing RHUB with buffered RE data according to a control signal according to an embodiment of the present invention;

fig. 9 is a flowchart of a data transmission method according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a base station according to a second embodiment of the present invention;

fig. 11 is a flowchart of a specific implementation of a data transmission method applied between a BBU and an RRU according to another embodiment of the present invention;

fig. 12 is a flowchart of a specific implementation of a data transmission method applied to an uplink service executed between a BBU and an RRU according to another embodiment of the present invention;

FIG. 13 is a diagram illustrating data writing and reading during an uplink service according to an embodiment of the present invention

Fig. 14 is a schematic diagram illustrating a comparison between processing procedures of an uplink service and a downlink service in a scenario of multi-stage cascade RHUB according to an embodiment of the present invention;

fig. 15 is a block diagram of a base station according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Exemplarily, fig. 1 shows a schematic structural diagram of an existing base station. The base station can be used for transmitting various types of mobile communication data, such as 3G-standard mobile communication data, 4G-standard mobile communication data, 5G-standard mobile communication data, and the like. Referring to fig. 1, the base station at least includes the following three units, which are an indoor baseband processing unit BBU, a radio remote hub RHUB, and a radio remote unit RRU. The transmission path between the BBU and the RRU is provided with RHUB, namely, one end of the RHUB is connected with one end of the BBU, and the other end of the RHUB is connected with the RRU. In this embodiment, two RRUs, that is, the RRU1 and the RRU2, are connected to the BBU, and it should be noted that the number of the RRUs connected to the BBU can be determined according to actual situations, one RRU may be connected to the BBU, or two or more RRUs may be connected to the BBU below, and the number of the RRUs connected to the BBU is not limited herein. In the process of data transmission between the BBU and the RRU, the service may be specifically divided into two types of services, namely, a downlink service in which the BBU sends data to the RRU, and an uplink service in which the RRU sends data to the BBU. The following description will take RE data transmission under the eccri protocol as an example. It should be noted that, for RE data, for example, as shown in fig. 2, one data frame corresponds to one period, and one period includes 10 slots, which are an uplink slot U, a special slot S, and a downlink slot D, and each slot may also be divided into a plurality of characters. It is easily understood that data corresponding to uplink symbols (hereinafter referred to as "uplink symbol data") is used for uplink traffic transmission, and data corresponding to downlink symbols (hereinafter referred to as "downlink symbol data") is used for downlink traffic transmission. It should be understood that the number of slots in one cycle and the number of symbols in one slot may be set according to the clock frequency; the ratio of the uplink time slot U, the special time slot S and the downlink time slot D in one period, and the ratio of the uplink symbol U, the downlink symbol D and the gap symbol G in one special time slot can be set according to actual needs. The number of cycles (frames) in data (or signals), the number or type of slots contained in a cycle, the number of symbols in a slot, and the allocation of each type of symbol in a particular slot may be collectively referred to as the slot allocation of data (or signals). In the process of uplink service and downlink service of the BBU and the RRU, data transmission may be performed by using an agreed timeslot ratio.

In the process of executing the downlink service, the BBU encapsulates RE data to be sent into a plurality of data frames, compresses the data frames to obtain RE data to be sent, which is encapsulated based on an eCPRI protocol, and sends the RE data to the RHUB, the RHUB receives the RE data through the receiving module, decompresses the RE data to be sent in the decompression module, performs IFFT processing on decompressed data blocks in the IFFT module, stores the processed RE data in a cache region in the cache module to obtain cached RE data, and the RHUB can read the RE data from the cache region, and distributes the RE data to a corresponding RRU for sending after inserting a CP in the CP inserting module. Because certain time is needed for executing the processing, in order to realize the time delay alignment between the units, a preset time delay compensation time length can be set between the BBU and the RRU, the BBU sends data to the RHUB in advance for processing, and the length of the advance time is the time delay compensation time length.

Exemplarily, fig. 3 shows a schematic diagram of a corresponding time slot when a downlink service is executed between a BBU and an RRU according to an embodiment of the present application. Referring to fig. 3, the preset time delay compensation duration between the BBU and the RRU is 4 time slots. If the BBU needs to send Data1 in the first downlink timeslot (i.e., timeslot 6) of the 2T sending cycle, the BBU sends Data to the RHUB 4 timeslots in advance for processing and storing, that is, the RHUB receives Data1 sent by the BBU in the last downlink timeslot (i.e., timeslot 1) of the previous cycle and processes Data1, which may refer to the above description, and is not described herein again. And the RHUB stores the processed data in a cache region to obtain the pre-stored data. When the RHUB is in the first downlink time slot (i.e., time slot 6) of the 2T cycle, the pre-stored data that has been stored in the buffer region may be sent to the RRU, so that the delay alignment between the BBU and the RRU is realized. The subsequent Data can also be completed by referring to the above manner, and Data2 to Data4 are sequentially sent to RHUB at the time slot corresponding to the delay compensation time length preset in advance.

However, in the actual transmission process, possibly due to the fact that the transmission link is just established or has insufficient processing capability or the delay fluctuates, although the BBU sends Data1 to the RHUB a certain time ahead, the RHUB does not obtain the Data1 in the first downlink slot (i.e., slot 6) of the 2T period, and the Data1 may be received in the second downlink slot (i.e., slot 7). In the existing Data transmission mode, Data1 is sent in the second downlink time slot (i.e., time slot 7), and each subsequent Data is sent after being delayed in sequence, so that delay offset between the BBU and the RRU is caused, and robustness and accuracy of the Data transmission process are reduced.

To solve the problems in the prior art, fig. 4 shows a schematic structural diagram of a base station according to another embodiment of the present application. In this embodiment, the RHUB is configured with a control module, and the control module outputs a control signal to keep the delay alignment between the BBU and the RHUB when transmitting the downlink traffic.

In the embodiment of the present invention, the main execution body of the process is a data transmission system between a BBU and an RRU, and the data transmission system may specifically be a base station, where the base station includes at least one BBU, at least one RHUB, and at least one RRU. Fig. 5 shows a flowchart of an implementation of the downlink data transmission method according to the first embodiment of the present invention, which is detailed as follows:

in S501, the radio remote hub RHUB receives RE data issued by the baseband processing unit BBU, and caches the RE data, where the RE data carries a symbol number.

In this embodiment, the BBU sends RE data to the RHUB when executing the downlink service. Wherein the RE data carries a number. The numbering includes cycle numbering, slot numbering and symbol numbering, and the numbering is performed according to the slot ratio, and one embodiment of the numbering is performed from 1 to n according to the slot or symbol type. As shown in fig. 6, a data structure of initial RE data generated for a BBU. The cycle number 1T represents the first cycle, the slot number 1T1D represents the first downlink slot of the first cycle, the symbol number 1T1D1D represents the first downlink symbol of the first downlink slot of the first cycle, and so on, and nTnDnD represents the nth downlink symbol of the nth downlink slot of the nth cycle. It should be noted that the length of one RE data may be one period or multiple periods. It is easy to understand that, because only the downlink symbol is sent in the downlink service, the RE data sent by the BBU and the buffered RE data do not include the G and U symbols.

In S502, the RHUB generates a control signal in synchronization with the RE data issued by the BBU, the control signal having the same number as the initial RE data corresponding to the issued RE data.

In this embodiment, when performing downlink traffic, the RHUB may generate a control signal through a built-in control module, where the control signal has the same number as the initial RE data. Note that the same numbers of the control signal and the RE data mean that the slot allocation and the numbering scheme are the same. The initial RE data corresponding to the delivered RE data may be referred to as the initial data of the delivered RE data for short. Illustratively, fig. 7 shows a schematic diagram of a control signal provided by an embodiment of the present application. Referring to fig. 6, the control signal and the initial RE Data have the same slot ratio, that is, the signal length is a period, and one period T includes 10 slots, which are 7 downlink slots D, 1 special slot S, and 2 uplink slots U, respectively, where each slot includes 14 symbols, and for the special slot, the special slot includes 6 downlink symbols D, 4 interval symbols g, and 4 uplink symbols U, and each symbol may carry corresponding symbol Data, that is, Data. The periods, the time slots and the symbols are numbered, and the numbering modes of the periods, the time slots and the symbols are the same. It is easy to understand that when the symbol numbers of the two are the same, the corresponding cycle and slot numbers are also the same. Accordingly, the numbering is the same, i.e., the numbering is the same.

It should be noted that, in the process of executing the downlink service, the control signal may be generated at a certain rate, and the rate is the same as the data transmission rate of the BBU, that is, the transmission of the RE data of the BBU and the generation of the control signal by the control module are executed synchronously. The synchronization means that, in order to implement the delay alignment, the BBU will send RE data to the RHUB for a preset delay compensation duration in advance.

In S503, the RHUB controls reading of the cached RE data based on the comparison between the control signal and the symbol number of the RE data, and sends the read RE data to the remote radio unit RRU, so as to align the time delays.

During data transmission, the RHUB compares the code of the control signal generated by the control module with the symbol number of the RE data stored in the buffer area. The RHUB can control reading of the cached RE data according to a comparison result of the two, and send the read RE data to the remote radio unit RRU, so as to align the time delays.

In a possible implementation manner, if two or more RRUs are connected below the RHUB, the read RE data may be distributed to the corresponding RRUs for transmission.

Fig. 8 is a schematic diagram illustrating a process of comparing the RHUB with the buffered RE data according to the control signal. It should be noted that, in the downlink service processing, the BBU only sends downlink symbol data to the RHUB; similarly, in the uplink service processing, the RRU only sends uplink symbol data to the RHUB. Specifically, S503 can be specifically divided into the following two cases:

case 1: and if the control signal is consistent with the symbol number of the cached RE data, the RHUB reads the cached RE data corresponding to the consistent symbol number and sends the RE data corresponding to the consistent symbol number to the RRU.

The symbol numbers being identical mean that the symbol numbers of the control signal and the RE data are identical at the same time. It is easy to understand that, in practice, when the symbol numbers are the same, the corresponding cycle and slot numbers are also the same. At this time, the cached RE data corresponding to the same symbol number may be read, and the read RE may be sent to the RRU.

Case 2: and if the symbol numbers of the control signal and the RE data are not consistent, the RHUB sends appointed data to the RRU.

It is easy to understand that if the two are not matched, it indicates that there is a case of delay misalignment, and at this time, corresponding operations are performed to repair the above case and maintain the delay alignment between the units in the whole transmission process.

In this embodiment, if the RHUB identifies that the symbol number of the RE data in the buffer area is inconsistent with the symbol number of the control signal, the symbol number inconsistency indicates that the symbol numbers of the control signal and the RE data are different at the same time, that is, it indicates that one or more of the period number, the slot number, and the symbol number are inconsistent, and at this time, it indicates that the time delays between the BBU and the RHUB are not aligned. The reason for the misalignment of the time delay may be that the time delay between the BBU and the RHUB is not aligned because the data sent by the BBU is late or related preprocessing is still performed in the RHUB, and in this case, the RHUB does not send the RE data with inconsistent numbers, but sends preset appointed data to the RRU.

For the case of inconsistent symbol numbers, the method can be divided into two cases, which are respectively:

case 2.1 if during the downlink symbol period of the control signal, RHUB sends the provisioning data to RRU.

Case 2.2, if the RHUB sends appointed data to the RRU during the interval symbol or uplink period of the control signal, and determines whether RE data is stored in the cache region; and if the RE data is stored in the cache region, the RHUB executes response operation based on the comparison of the RE data and the symbol number of the next downlink symbol.

In this embodiment, when detecting that the control signal is in the period of the uplink symbol or the interval symbol, the RHUB indicates that the transmission of the downlink service is not performed, and in a normal case, the RE data sent by the BBU is not received, that is, the RE data is not written in the buffer area. In this case, the RHUB may send preset provisioning data to the RRU.

During the control signal uplink symbol or interval symbol, the number of the next downlink symbol of the control signal is compared with the symbol number of the RE data, and a responsive operation is performed according to the comparison result.

The comparison result can be divided into two types, wherein the first type is that the symbol number of RE data is consistent with the symbol number of the next downlink symbol; the second type is that the RE data is not consistent with the symbol number of the next downlink symbol.

For the case of consistency, the RHUB may read RE data corresponding to the consistent symbol number in the next downlink symbol, and send the RE data corresponding to the consistent symbol number to the RRU.

The case of inconsistency represents data exception, wherein the abnormal case is divided into two cases of data late arrival exception and data error exception (sending null data or data inconsistent with the symbol number, which will be considered as error data), as shown in fig. 8. At this time, an error number clear enable is generated to delete the RE data of the inconsistent symbol number.

Exemplarily, after the above steps, the data transmission method in this embodiment further includes continuous inconsistent downlink symbol detection. During the downlink symbol period of the control signal, when the RHUB detects that the number of symbols in which the RE data and the control signal are continuously inconsistent exceeds the threshold, it indicates that the delay difference is large at this time, and at this time, the RHUB terminates reading the cached RE data, and RE-agrees the preset delay compensation duration with the RRU, and the above steps S501-S503 are performed again. The threshold value can be preset according to actual needs.

Exemplarily, fig. 9 shows a flowchart of a data transmission method provided by an embodiment of the present application. Referring to fig. 9, the downlink data transmission method specifically includes the following steps:

step 1: in the process of executing downlink traffic, the RHUB generates a control signal having the same number as the initial RE data in the BBU.

Step 2: RHUB determines whether the control signal is in the downlink symbol. If yes, executing step 3; if not, go to step 7.

And step 3: and the RHUB acquires the serial number of the RE data of the cache region.

And 4, step 4: and judging whether the RE data is consistent with the serial number of the control signal. If yes, executing step 5; if not, executing step 6.

And 5: and reading RE data corresponding to the consistent symbol number, and sending the RE data corresponding to the consistent symbol number to the RRU.

Step 6: and not reading RE data corresponding to the inconsistent symbol numbers, and sending preset appointed data to the RRU.

And 7: and if the control signal is in the uplink symbol and the interval symbol period, the RHUB sends preset appointed data to the RRU.

And 8: and if the RHUB detects that the RE data exists in the cache region, reading the number of the RE data.

And step 9: and judging whether the symbol number of the RE data is consistent with the symbol number of the next downlink symbol. If yes, waiting for the next downlink symbol to arrive, returning to the step 1, reading RE data corresponding to the consistent symbol number during the next downlink symbol period, and sending the RE data corresponding to the consistent symbol number to the RRU; if not, go to step 10.

Step 10: and deleting the RE data corresponding to the inconsistent symbol numbers in the cache region.

In the process of executing the uplink service, the RRU may buffer the uplink service data in the RHUB, remove the CP in the uplink service data, and execute inverse processing corresponding to the downlink service, that is, perform FFT (fast Fourier transform), compress and send the inversely processed data to the BBU for decompression, so as to complete the uplink service. If two RRUs are connected below the RHUB, uplink service data of the two RRUs can be cached in the RHUB in the first stage and aligned in a time domain, the data is generated according to a data frame header associated with a channel, a write address trigger signal is generated, the RHUB can write the uplink service data into a cache region in response to the write address trigger signal, and a read side reads the data by using a uniform read address, so that data alignment is realized. And then the CP removing module carries out CP removing operation.

As can be seen from the above, in the data transmission method applied between the BBU and the RRU provided in the embodiment of the present invention, in the process of executing the downlink service of sending data from the BBU to the RRU, the RE data sent from the BBU to the RHUB carries a symbol number, and when receiving the RE data sent from the BBU, the RHUB also generates a control signal in synchronization with the RE data sent from the BBU, where the control signal has the same symbol number as the RE data. The RHUB identifies whether the time delay between the BBU and the RHUB is aligned by comparing whether the symbol numbers of the RE data and the control signal are consistent, controls reading of the cached RE data based on whether the time delay is aligned, and sends the read RE data to the RRU to align the time delay, so that the problem that the time delay is not aligned when the existing BBU and the RRU are transmitted is solved, and the accuracy and the robustness of data transmission are improved.

Fig. 10 is a schematic structural diagram of a base station according to a second embodiment of the present invention. Referring to fig. 10, the base station includes a BBU and at least two RHUBs, and two RRUs are connected below each RHUB, where the two RHUBs are respectively RUB1 and RHUB2, that is, two RHUBs are cascaded between the BBU and the RRU in the distributed reference, and certainly, in other scenarios, more than two RHUBs may also be cascaded. As shown in fig. 8, RHUB2 in the figure is a downstream RHUB of RHUB1, and correspondingly, RHUB1 is an upstream RHUB of RHUB 2. Of course, in other scenarios, the RHUB2 may be further followed by the RHUB3 and so on. The operation processes executed by the units may refer to the description of the above embodiment, and are not described herein again.

Fig. 11 is a flowchart illustrating a specific implementation of a downlink data transmission method according to another embodiment of the present application. Referring to fig. 11, the downlink data transmission method provided in this embodiment is used in a base station with multiple RHUB cascades, and specifically includes: s1101 to S1105 are described in detail as follows:

in S1101, the RHUB1 receives RE data issued by the BBU; wherein the RE data carries a number.

In S1102, the RHUB1 forwards the RE data sent by the BBU to the RHUB of the downlink RHUB1, that is, to the RHUB 2.

In this embodiment, if there are multiple cascaded RHUBs in the base station, the uplink RHUB forwards the received data sent by the BBU to the cascaded RHUB. As shown in fig. 10, if RHUB1 is the head-level RHUB connected to the BBU, the BBU will send the downlink data to be sent to the RHUB 1; and RHUB2 is the downlinked RHUB of RHUB1, therefore, RHUB1 will forward the received RE data to the downlinked RHUB, i.e., RHUB 2. If RHUB2 is also connected to a subordinate RHUB, for example, RHUB3, RE data received by the uplink RHUB may be forwarded to the subordinate RHUB, that is, downlink data received by RHUB1 may be forwarded to RHUB3, and so on.

In S1103, the RHUB1 preprocesses the RE data, and stores the preprocessed RE data in a cache area; meanwhile, the RHUB2 preprocesses the RE data and stores the preprocessed RE data in the cache region of the RHUB 2.

In S1104, the RHUB1 generates a control signal synchronized with the RE data issued by the BBU; the control signal has the same symbol number as the RE data. Meanwhile, the RHUB2 generates a control signal synchronous with RE data issued by the BBU.

In S1105, RUB1 controls reading of the buffered RE data based on a comparison between the local control signal and the symbol number of the RE data, and sends the read RE data to the RRU connected to RUB1, so as to align the time delays. Meanwhile, the RHUB2 controls reading of the cached RE data based on comparison between the local control signal and the symbol number of the RE data, and sends the read RE data to the RRU connected to the RHUB2, so as to align the time delay.

In the subsequent process of executing the downlink service, similar to the way of single RHUB processing, the specific description may refer to the related description of the above embodiment. And will not be described in detail herein.

In the embodiment of the application, under the condition that multiple stages of cascaded RHUBs exist, the upper stage of RHUB forwards corresponding data to the secondary stage of RHUB, and the operation of time delay alignment is executed at each stage of RHUB, so that the accuracy and robustness of a data transmission process in a scene of multiple stages of cascaded RHUBs can be improved.

Fig. 12 is a flowchart illustrating a specific implementation of an uplink data transmission method according to another embodiment of the present invention. Referring to fig. 12, the base station provided in this embodiment includes multiple cascaded RHUBs, and the uplink data transmission method includes: s1201 to S1209 are specifically described as follows:

in S1201, during the uplink service execution process, the RHUB1 detects whether the first uplink data sent by the RRU is stored in the local cache region; the first uplink data carries a number; for example, the numbering is consistent with the numbering in the downlink data transmission process, and reference may be specifically made to the above description, which is not described herein again.

In S1202, if the RHUB1 does not detect that the first uplink data sent by the RRU is stored in the local cache region, that is, the cache region is empty, the operation of S1001 is executed again.

In this embodiment, in the monitoring process, whether the first uplink data is written into the local cache region may be determined by generating a corresponding write instruction in the cache region.

Exemplarily, fig. 13 shows a schematic diagram of data writing and reading when performing an uplink service according to an embodiment of the present application. Referring to fig. 13, an RRU writes uplink data to a corresponding RHUB, where the RRU connected to RHUB1 writes first uplink data; and the RRU connected to the secondary RHUB2 writes the second uplink data. Similar to the downlink data, the uplink data will be transmitted in the uplink time slot and the uplink symbol of the special time slot, as shown in the write-side sequence. Correspondingly, the writing sequence of RHUB2 is the same as that of RHUB1, and is not described herein again.

In S1203, if it is detected that the first uplink data sent to the BBU1 by the RRU is stored in the buffer area, the RUB1 starts a waiting window, and monitors whether the second uplink data sent by the RHUB2 is received.

In this embodiment, in order to implement delay alignment, in the process that the RRU sends the uplink data to the BBU, the RHUB1 needs to configure a waiting window, so as to send the RE data of the uplink service to the BBU within a preset waiting time. Wherein the wait window is associated with an uplink window of the BBU.

In other scenarios, if the RHUB2 is connected to the next, for example, RHUB3, when receiving the second uplink data sent by the RRU connected to the RHUB2, the RHUB2 may also start a local waiting window, and in this case, the waiting window of the RHUB2 is related to the number of cascaded layers where the RHUB2 is located in the multiple-stage cascaded RHUB.

For a cascade of multiple stages of RHUB,. The RHUB stores data after completing FFT in the current stage in a local first buffer area, where the first buffer area is specifically used to store symbol data after completing FFT in the current stage, and for example, for the RHUB1, the first uplink data is stored in the first buffer area. The RHUB1 is further configured with another buffer area, which is a second buffer area, and is configured to store symbol data after FFT processing sent by a downlink RHUB, for example, for the RHUB1, the second buffer area is specifically configured to store second uplink data. If the cascade level where the RHUB is located is lower, that is, the number of the upstream RHUBs is larger, the more the subsequent merging operations need to be executed, so that the waiting window should be set to be smaller to reserve enough time for the subsequent merging operations; conversely, the higher the cascade level where the RHUB is located, i.e., the smaller the number of the upstream RHUBs, the larger the waiting window, but the maximum value of the waiting window does not exceed the uplink window of the BBU. By configuring corresponding waiting windows for different levels, the overtime condition can be identified and processed in time, the condition that the lower-level overtime condition affects the upper-level RHUB is avoided, and the accuracy of data transmission and the timeliness of abnormity identification are improved.

In S1204, RHUB1 determines whether or not the waiting window is exceeded. If yes, the operation of S1210 is performed; if not, whether second uplink data sent by the downlink RHUB2 is received or not is judged.

In S1205, if the second uplink data sent by the secondary connection RHUB is not received, the operation of S1204 is executed again.

In S1206, if the RHUB1 receives the second uplink data uploaded by the RHUB (i.e., RHUB2) downlinked by the RHUB1 in the waiting window, the RHUB1 obtains the number of the second uplink data. Similarly, the second uplink data uploaded by the RHUB2 also carries a number, and the numbering manner of the number is the same as that described in the above embodiment, and is not described again here.

In S1207, it is determined whether the number of the first uplink data matches the number of the second uplink data. If yes, executing the operation of S1208; otherwise, the operation of S1209 is performed.

In S1208, if the symbol numbers of the first uplink data and the second uplink data are consistent, the RHUB1 merges the first uplink data and the second uplink data corresponding to the consistent symbol numbers, and sends the merged data of the first uplink data and the second uplink data to the BBU.

In this embodiment, the RHUB1 will combine the first uplink data and the second uplink data, and send the combined data to the BBU. Of course, if there is also an uplinked RHUB from RHUB1, the merged data may be sent to the uplinked RHUB.

Exemplarily, the merging method is cell merging, where the method for performing cell merging specifically includes: merging the data with the same symbol number in the first uplink data and the second uplink data, for example, merging the data of 1T1U1U in the first uplink data and the data of 1T1U1U in the second uplink data, merging the data of 1T1U2U in the first uplink data and the data of 1T1U2U in the second uplink data, and so on, thereby completing merging all the data in the first uplink data and the second uplink data. Under the condition that the base station has multiple stages of cascaded RHUBs, the RHUBs at all stages can generate control signals according to the synchronized control module, and the received uplink data can be locally processed by removing the CP at all stages of RHUBs and inserted with the serial numbers. At this time, if time delay alignment between the multiple stages of RHUBs and the BBU is to be realized, the first stage RHUB needs to perform cell merging on the received uplink data of other stages of RHUBs, and then return the merged data to the BBU. This requires that the last-level RHUB has a cache capability for storing the data uploaded by the secondary RHUB, for example, the RHUB1 needs to have a capability for storing the cache data uploaded by the RHUB2, and the first uplink data of the RHUB1 needs to wait for the second uplink data with the same data number uploaded by the RHUB2, and then merge and send the second uplink data to the BBU.

In S1209, if the symbol numbers of the first uplink data and the second uplink data do not match, the RUB1 deletes the second uplink data corresponding to the non-matching symbol number, and transmits the first uplink data corresponding to the non-matching symbol number to the BBU.

In this embodiment, if the RHUB1 recognizes that the symbol numbers of the first uplink data and the second uplink data are not identical, the RUB1 deletes the second uplink data corresponding to the non-identical symbol number and transmits the first uplink data corresponding to the non-identical symbol number to the BBU. As described above, the second uplink data will be stored in the second buffer area, and the BBU will delete the second uplink data of the symbol numbers that are inconsistent in the second buffer area.

In S1210, if the second data uploaded by the RHUB2 is not received within the waiting window, the first uplink data is sent to the BBU.

In this embodiment, since hardware processing time of different RHUBs is basically fixed, as long as the waiting window is set reasonably, data of a higher-level RHUB will definitely arrive within the waiting threshold, and if the data does not arrive beyond the waiting window, that is, it indicates that the waiting time is out, only uplink data of the current-level RHUB (that is, the first uplink data is used for RHUB 1) is sent.

In the embodiment of the application, in the process of executing the uplink service, in the base station with the multiple cascaded RHUBs, the uplink data can be combined and time delay aligned in the buffer areas of the RHUBs at all levels, corresponding waiting windows can be configured for the RHUBs corresponding to different levels, abnormal conditions of processing overdue and symbol number consistency can be identified in time, and the accuracy and robustness of data transmission are improved.

Exemplarily, fig. 14 shows a schematic diagram illustrating a comparison between processing procedures of an uplink service and a downlink service in a scenario of multi-stage cascade RHUB according to an embodiment of the present application. Referring to fig. 14, in the process of executing the downlink service, each stage of the RHUB and the BBU are synchronized, and after the synchronization is completed, the BBU sends RE data of the downlink service to the highest stage of the RHUB, that is, sends RE data of the downlink service to the RHUB 1. The RHUB1 sends the received RE data of the downlink service to the secondary RHUB connected downstream, that is, the RHUB2 receives the RE data of the downlink service sent by the RHUB1, and if there is a secondary RHUB in the RHUB2, the RE data of the downlink service is forwarded continuously. After receiving the RE data of the downlink service, the RHUB1 and the RHUB2 may process the RE data, and simultaneously send the RE data of the downlink service to the connected RRU in the corresponding time slot.

In the process of executing the uplink service, each stage of RHUB receives uplink service data sent by the connected RRU, and then the upper stage of RHUB waits for uplink service data uploaded by the secondary RHUB, for example, the RHUB1 waits for uplink service data uploaded by the RHUB2, and starts a waiting window. And if the uplink data uploaded by the secondary RHUB is received in the waiting window, combining the uplink data of the current stage with the uplink data uploaded by the secondary RHUB to obtain combined uplink data, and sending the combined uplink data to the BBU.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

Fig. 15 is a block diagram illustrating a structure of a base station according to an embodiment of the present invention, where the base station includes units for performing steps in the embodiments corresponding to fig. 5, fig. 11, and fig. 12. Please refer to fig. 5, fig. 11, and fig. 12 for related descriptions. For convenience of explanation, only the portions related to the present embodiment are shown.

Referring to fig. 15, a base station comprises at least one BBU131, at least one RHUB152, and at least one RRU 153;

the RHUB152 is configured to receive RE data issued by the BBU151 and cache the RE data in the downlink service execution process, where the RE data carries a symbol number;

the RHUB152 is configured to generate a control signal in synchronization with the RE data issued by the BBU152, where the control signal has the same symbol number as the RE data;

the RUHB152 is configured to control reading of the cached RE data based on comparison between the control signal and the symbol number of the RE data, and send the read RE data to the RRU153, so as to align the time delay.

Optionally, the RHUB152 is configured to control reading of the buffered RE data based on a comparison between the control signal and a symbol number of the RE data, and send the read RE data to the RRU153, and includes:

the RHUB152 is configured to, if the control signal is consistent with the symbol number of the RE data, read the cached RE data corresponding to the consistent symbol number, and send the RE data corresponding to the consistent symbol number to the RRU;

the RHUB152 is configured to send contracted data to the RRU if the symbol numbers of the control signal and the RE data are not consistent.

Optionally, the RHUB152 is configured to send appointed data to the RRU if the symbol number of the control signal and the symbol number of the RE data are inconsistent, and includes:

the RHUB152 is configured to send appointed data to the RRU if the interval symbol or the uplink symbol period of the control signal is reached, and determine whether RE data is stored in a cache region;

the RHUB152 is configured to, if RE data is stored in the cache area, perform a response operation based on a comparison between the RE data and a symbol number of a next downlink symbol.

Optionally, the RHUB152 is configured to, if RE data is stored in the cache region, perform a response operation based on a comparison between the RE data and a symbol number of a next downlink symbol, where the response operation includes:

the RHUB152 is configured to, if the RE data is consistent with the symbol number of the next downlink symbol, read the RE data corresponding to the consistent symbol number in the next downlink symbol, and send the RE data corresponding to the consistent symbol number to the RRU;

the RHUB152 is configured to generate a clear enable if the RE data is inconsistent with the symbol number of the next downlink symbol, so as to delete the RE data corresponding to the inconsistent symbol number in the cache region.

Optionally, the BBU151 in the base station has a RHUB152 and a RHUB154 connected thereunder; wherein RHUB152 is an uplink RHUB of RHUB 154;

the RHUB152 is configured to, in a process of executing an uplink service, start a waiting window if the buffered first uplink data sent by the RRU153 is detected;

the RHUB152 is configured to control, based on whether second uplink data uploaded by the RHUB154 is received in the waiting window, combination of the first uplink data and the second uplink data, and send the first uplink data or data obtained by combining the first uplink data and the second uplink data to the BBU, so as to align time delays.

Optionally, the controlling, by the first RHUB152, combining the first uplink data and the second uplink data based on whether the second uplink data uploaded by the RHUB154 is received in the waiting window, and sending the first uplink data or the data obtained by combining the first uplink data and the second uplink data to the BBU, so as to align the time delays includes:

the RHUB152 is configured to determine whether symbol numbers of the first uplink data and the second uplink data are consistent if the second uplink data uploaded by the RHUB154 is received in the waiting window;

the RHUB1532 is configured to, if the symbol numbers of the first uplink data and the second uplink data are consistent, merge the first uplink data and the second uplink data corresponding to the consistent symbol numbers, and send data obtained by merging the first uplink data and the second uplink data to the BBU 151;

the RHUB1532 is configured to delete the second uplink data corresponding to the inconsistent symbol number and send the first uplink data corresponding to the inconsistent symbol number to the BBU if the symbol numbers of the first uplink data and the second uplink data are inconsistent.

Optionally, the combining the first uplink data and the second uplink data corresponding to the consistent symbol numbers specifically includes: and carrying out cell merging on the first uplink data and the second uplink data corresponding to the consistent symbol numbers.

Optionally, the RHUB152 is configured to control, based on whether second uplink data uploaded by the RHUB154 is received in the waiting window, combination of the first uplink data and the second uplink data, and send the first uplink data or the data obtained by combining the first uplink data and the second uplink data to the BBU, so as to align time delays, and includes:

the RHUB152 is configured to send the first uplink data to the BBU if the first RHUB does not receive the second uplink data uploaded by the RHUB154 in the waiting window.

Therefore, the base station provided in the embodiment of the present invention may also be configured to, in the process of executing the downlink service in which the BBU sends the data to the RRU, carry a symbol number in the RE data sent by the BBU to the RHUB, and when receiving the RE data sent by the BBU, the RHUB may also generate a control signal in synchronization with the RE data sent by the BBU, where the control signal has the same symbol number as the RE data. The RHUB identifies whether the time delay between the BBU and the RHUB is aligned by comparing whether the symbol numbers of the RE data and the control signal are consistent, controls reading of the cached RE data based on whether the time delay is aligned, and sends the read RE data to the RRU to align the time delay, so that the problem that the time delay is not aligned when the existing BBU and the RRU are transmitted is solved, and the accuracy and the robustness of data transmission are improved.

The base station comprises a distributed base station and an integrated base station, wherein the BBU, the RRU and the RHUB are usually used as independent equipment in the distributed base station and are commonly found in the macro base station. An all-in-one base station will typically assemble or integrate the BBU, RRU, RHUB described above into the same device, commonly found in micro base stations.

The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps in the above method embodiments. The computer readable storage medium may be non-volatile or volatile. The computer-readable storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims

1. A downlink data transmission method is characterized by comprising the following steps:

2. The downlink data transmission method according to claim 1, wherein the RHUB controls reading of the buffered RE data based on a comparison between the control signal and a symbol number of the RE data, and sends the read RE data to a remote radio unit RRU, and the method includes:

if the control signal is consistent with the symbol number of the RE data, the RHUB reads the cached RE data corresponding to the consistent symbol number and sends the RE data corresponding to the consistent symbol number to the RRU;

and if the symbol numbers of the control signal and the RE data are not consistent, the RHUB sends appointed data to the RRU.

3. The downlink data transmission method according to claim 2, wherein the sending, by the RHUB, appointed data to the RRU if the symbol numbers of the control signal and the RE data are not consistent includes:

if the RHUB is in the interval symbol or the uplink symbol period of the control signal, the RHUB sends appointed data to the RRU and judges whether RE data are stored in a cache region;

and if the RE data is stored in the cache region, the RHUB executes response operation based on the comparison of the RE data and the symbol number of the next downlink symbol.

4. The downlink data transmission method according to claim 3, wherein if RE data is stored in the buffer area, the RHUB performs a response operation based on a comparison between the RE data and a symbol number of a next downlink symbol, including:

if the RE data is consistent with the symbol number of the next downlink symbol in the control signal, the RHUB reads the RE data corresponding to the consistent symbol number in the next downlink symbol and sends the RE data corresponding to the consistent symbol number to the RRU;

and if the RE data is not consistent with the symbol number of the next downlink symbol in the control signal, the RHUB generates a clear enable so as to delete the RE data corresponding to the inconsistent symbol number in the cache region.

5. The downlink data transmission method according to any one of claims 1 to 4, wherein the RHUB controls reading of the cached RE data based on the comparison between the control signal and the symbol number of the RE data, and after the step of sending the read RE data to a Remote Radio Unit (RRU), the method comprises: and detecting the number of continuous inconsistent symbols during the downlink symbols of the control signal, and repeating the steps of the downlink data transmission method when the detected number of symbols exceeds a threshold value.

6. A radio remote hub, RHUB, comprising:

and the sending module is used for sending the read RE data to a Remote Radio Unit (RRU) so as to align time delay.

7. The remote radio hub RHUB of claim 6, further comprising:

and the CP inserting module is used for inserting CP into the read RE data.

8. A base station, characterized in that the base station comprises: at least one BBU, at least one RHUB according to any one of claims 6 to 7, and at least one RRU.

9. An uplink data transmission method is characterized in that a first RHUB and a second RHUB are cascaded between a BBU and a RRU; wherein the first RHUB is an upper link RHUB of the second RHUB;

the uplink data transmission method comprises the following steps:

10. The uplink data transmission method according to claim 9, wherein the first RHUB controls the combining of the first uplink data and the second uplink data based on whether a second uplink data uploaded by a second RHUB is received within the waiting window, and transmits the first uplink data or the combined data of the first uplink data and the second uplink data to the BBU, so as to align the time delays, and includes:

if the first RHUB receives second uplink data uploaded by the second RHUB in the waiting window, whether the symbol numbers of the first uplink data and the second uplink data are consistent or not is judged;

if the symbol numbers of the first uplink data and the second uplink data are consistent, the first RHUB combines the first uplink data and the second uplink data corresponding to the consistent symbol numbers, and sends the data obtained by combining the first uplink data and the second uplink data to the BBU;

and if the symbol numbers of the first uplink data and the second uplink data are inconsistent, the first RHUB deletes the second uplink data corresponding to the inconsistent symbol numbers and sends the first uplink data corresponding to the inconsistent symbol numbers to the BBU.

11. The uplink data transmission method according to claim 10, wherein the combining the first uplink data and the second uplink data corresponding to the consistent symbol number specifically includes: and carrying out cell merging on the first uplink data and the second uplink data corresponding to the consistent symbol numbers.

12. The uplink data transmission method according to claim 9, wherein the first RHUB controls the combining of the first uplink data and the second uplink data based on whether a second uplink data uploaded by a second RHUB is received within the waiting window, and transmits the first uplink data or the combined data of the first uplink data and the second uplink data to the BBU, so as to align the time delays, and includes:

and if the first RHUB does not receive second uplink data uploaded by the second RHUB in the waiting window, the first RHUB sends the first uplink data to the BBU.

13. A base station, characterized in that the base station comprises: the RRU comprises at least one BBU, a first RHUB, an RRU connected with the first RHUB, a second RHUB and an RRU connected with the second RHUB; wherein the first RHUB is an upper link RHUB of the second RHUB;

14. The base station of claim 13, wherein said first RHUB comprises a storage module including a first FIFO and a second FIFO for storing said first uplink data and said second uplink data, respectively.

15. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, carries out the method according to any one of claims 1 to 5, and/or the method according to any one of claims 9 to 12.