CN107026719B

CN107026719B - Signal transmission method and communication device

Info

Publication number: CN107026719B
Application number: CN201610063757.4A
Authority: CN
Inventors: 郝兵琼; 夏林峰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-01-29
Filing date: 2016-01-29
Publication date: 2021-02-23
Anticipated expiration: 2036-01-29
Also published as: CN107026719A

Abstract

The embodiment of the application provides a signal transmission method and communication equipment, wherein the method comprises the steps of obtaining at least one first Orthogonal Frequency Division Multiplexing (OFDM) symbol which passes through a first remote radio node and needs to be sent to an uplink processing unit; transmitting at least one second OFDM symbol; the at least one second OFDM symbol is obtained by adding S zeros before the at least one first OFDM symbol in a time domain and removing the last S bit of the at least one first OFDM symbol, wherein S is an integer greater than or equal to 1; or, the at least one second OFDM symbol is obtained by dividing each OFDM symbol of the at least one first OFDM symbol into a previous part and a next part in a time domain, and placing the previous part after the next part. The embodiment of the application can distinguish the source of the combining signal, can realize that only part of signals need to be combined, and reduces the influence on the system performance.

Description

Signal transmission method and communication device

Technical Field

The present application relates to the field of communications, and more particularly, to a signal transmission method and a communication device.

Background

The existing indoor coverage system generally has the condition of signal combination. After the signals are combined, the indoor coverage can be enhanced, the user switching probability can be reduced, and the like. However, the uplink processing unit cannot well distinguish which radio remote node the combined signal comes from, and cannot obtain information of the radio remote node.

Therefore, a technical solution is urgently needed to better distinguish the sources of the combined signals.

Disclosure of Invention

The embodiment of the application provides a signal transmission method and communication equipment, which can distinguish the source of a combined signal.

In a first aspect, a signal transmission method is provided, including: acquiring at least one first Orthogonal Frequency Division Multiplexing (OFDM) symbol which passes through a first radio remote node and needs to be sent to an uplink processing unit; transmitting at least one second OFDM symbol; the at least one second OFDM symbol is obtained by adding S zeros before the at least one first OFDM symbol in a time domain and removing the last S bits of the at least one first OFDM symbol, wherein S is an integer greater than or equal to 1; or, the at least one second OFDM symbol is obtained by dividing each OFDM symbol of the at least one first OFDM symbol into a previous part and a next part in a time domain, and placing the previous part after the next part.

Optionally, in this embodiment of the present application, the at least one second OFDM symbol is delayed compared to the at least one first OFDM symbol. In one mode, adding S zeros before a foremost cyclic prefix of at least one first OFDM symbol, and removing a last S bit of the at least one first OFDM symbol to obtain at least one second OFDM symbol; in the second way, a cyclic shift is adopted, i.e. each OFDM symbol in the at least one first OFDM symbol is divided into a previous part and a next part in the time domain, and the previous part is placed after the next part to obtain at least one second OFDM symbol.

The two processing modes can realize that the uplink processing unit can distinguish and obtain the information of the plurality of radio remote nodes, and only part of OFDM symbols need to be subjected to delayed combining processing, and other OFDM symbols are not affected.

In addition, the time-frequency resources can be expanded by performing the delay processing in the cyclic shift manner, for example, the time-frequency resources can be expanded by nearly one time.

Optionally, in order to enable different radio remote nodes to have different delays, the value of S may be different for different radio remote nodes.

Optionally, in this embodiment of the present application, the length of S may be less than or equal to the length of a Cyclic Prefix (CP), so that the integrity of the delayed OFDM symbol may be ensured, and system performance degradation caused by delay is avoided.

In this embodiment of the present application, the Radio Remote node may be a Radio Remote Unit (RRU). The uplink processing Unit may obtain a signal sent by the radio remote node, demodulate the signal, and obtain a measurement amount from the demodulated signal, and may further schedule a resource for the terminal to send uplink data, specifically, the uplink processing Unit may be a Base Band Unit (BBU). The combining unit may be an RRU hub (rHub).

In the embodiment of the application, the method can be applied to a long term evolution LTE system, and the first OFDM symbol is an OFDM symbol where a sounding reference signal SRS is located. That is, only the OFDM symbol where the SRS is located may be subjected to the delay processing. The OFDM symbol where the SRS is located is delayed and combined, so that other OFDM symbols are not affected, and the overall influence on the system is small.

Optionally, in this embodiment of the present application, the first OFDM symbol is a specific OFDM symbol carried in a predetermined time period, where a time interval exists between every two predetermined time periods.

In the embodiment of the application, for a certain radio remote node, the delay processing may be performed on OFDM symbols where all SRSs received by the radio remote node are located, or may be performed only on OFDM symbols where SRSs received by the radio remote node in a part of time. For example, the delay processing may be performed only on the OFDM symbol where the SRS is received in all or part of the predetermined time period. Of course, the delay processing may also be performed on all or part of other specific OFDM symbols in the predetermined time period, or the delay processing may be performed on all or part of OFDM symbols in the predetermined time period.

The predetermined time period mentioned here is a general term for the time period of carrying the OFDM symbol that needs to be delayed in the system. The division of the predetermined period of time may be case-specific. For example, the predetermined time period is 3 time periods out of every 7 consecutive time periods, wherein any two predetermined time periods out of the 3 predetermined time periods are separated by at least one non-predetermined time period.

Optionally, in this embodiment of the present application, after receiving the first OFDM symbol that passes through the first radio remote node for a first predetermined time period, discard M-1 consecutive OFDM symbols that pass through the first radio remote node for the predetermined time period, where M is an integer greater than or equal to 2. Wherein, the M is the number of remote radio node groups, and the M remote radio node groups have the same transmitting antenna configuration. For example, antenna 0 is configured to be used by the M groups of remote radio nodes to transmit OFDM symbols that need to be subjected to delay processing, and

antennas

0 and 1 are configured to be used by the M groups of remote radio nodes to transmit other OFDM symbols that do not need to be subjected to delay processing.

Specifically, for M groups of remote radio nodes, different groups of remote radio nodes correspond to different predetermined time periods, and each predetermined time period is used for transmitting the OFDM symbol after the delay processing corresponding to the corresponding remote radio node group. The remote radio node is subjected to delay processing and combined sending in a polling mode, so that more measurement information of the remote radio node can be acquired, each polling period is shorter than the previous measurement period, and the method is particularly suitable for a scene in which the measurement information of the remote radio node in the adjacent cell needs to be acquired.

Optionally, in this embodiment of the present application, at least one OFDM symbol of the radio remote node received in a first predetermined time period may be subjected to delay processing; and transmitting the at least one OFDM symbol after the delay processing in a second predetermined time period, wherein the second predetermined time period is different from the first predetermined time period. Or, the delay processing may be performed on at least one OFDM symbol of the radio remote node received in a first predetermined time period; and transmitting the at least one OFDM symbol after the delay processing in the first preset time period.

That is, the OFDM symbol that needs to be processed and is currently received may be delayed and transmitted in the current predetermined time period, or the OFDM symbol that needs to be processed and is received in a certain predetermined time period may be stored in another predetermined time period and delayed and transmitted. Thereby a flexible configuration of the predetermined time period can be achieved.

Optionally, in this embodiment of the present application, the method is performed by the first remote radio node, that is, the delay processing may be performed by the remote radio node itself. The radio remote node may send the at least one second OFDM symbol to the combining unit through a single antenna. The data of each remote radio node is transmitted in a single antenna mode, so that the uplink processing unit can acquire more information of the remote radio nodes.

Optionally, in this embodiment of the present application, the method is performed by the combining unit, that is, the delay processing may be performed by the combining unit.

The combining unit also acquires at least one third OFDM symbol which passes through a second remote radio node and needs to be sent to the uplink processing unit; transmitting at least one fourth OFDM symbol; the at least one second OFDM symbol and the at least one fourth OFDM symbol are sent to the uplink processing unit in a combined manner, where the at least one second OFDM symbol and the at least one fourth OFDM symbol have different delays; the at least one fourth OFDM symbol is obtained by adding R zeros before the at least one third OFDM symbol in the time domain and removing the last R bit of the at least one third OFDM symbol, wherein R is an integer greater than or equal to 1; or, the at least one fourth OFDM symbol is obtained by dividing each OFDM symbol of the at least one fourth OFDM symbol into a previous part and a next part in a time domain, and placing the previous part after the next part.

In a second aspect, a signal transmission method is provided, where the method is performed by an uplink processing unit, and includes: determining the number of remote radio nodes needing to acquire measurement information; grouping the remote radio nodes needing to acquire the measurement information according to the number of the remote radio nodes needing to acquire the measurement information; configuring different predetermined time periods for remote radio node groups using the same transmitting antenna, wherein the predetermined time periods are used for at least two remote radio nodes in the remote radio node groups to transmit at least one OFDM symbol corresponding to each remote radio node, and the at least one OFDM symbol corresponding to each remote radio node has different time delays.

Optionally, the uplink processing unit configures the following processing for at least one OFDM symbol corresponding to each remote radio node in at least one remote radio node of the remote radio node group: the processing comprises adding at least one zero before the at least one OFDM symbol in time domain and removing at least one bit of the at least one OFDM symbol, wherein the number of bits added with zero is the same as the length of the removed number of bits; or, each OFDM symbol of the at least one OFDM symbol is divided into a previous part and a next part in a time domain, and the previous part is placed after the next part.

Optionally, the uplink processing unit determines the number of cells to which the radio remote node that needs to acquire the measurement information belongs and the number of transmitting antennas; grouping the remote radio nodes needing to acquire the measurement information according to the number of the remote radio nodes needing to acquire the measurement information, the number of cells to which the remote radio nodes belong and the data of the transmitting antenna; and configuring a single antenna for each remote radio node group to be used for transmitting the OFDM symbols corresponding to each remote radio node.

Optionally, the method is applied to a long term evolution LTE system, and the OFDM symbol is an OFDM symbol where a sounding reference signal SRS is located.

In a third aspect, a communication device is provided for performing the method of the first aspect or any optional implementation manner of the first aspect. In particular, the communication device comprises module means for performing the method of the first aspect described above or any possible implementation manner of the first aspect.

In a fourth aspect, there is provided a communication device for performing the method of the second aspect or any alternative implementation manner of the second aspect. In particular, the communication device comprises module means for performing the method of the second aspect described above or any possible implementation of the second aspect.

In a fifth aspect, a communication device is provided, comprising: a memory for storing instructions and a processor for executing the instructions stored by the memory and when the processor executes the instructions stored by the memory, the execution causes the processor to perform the method of the first aspect or any alternative implementation of the first aspect.

In a sixth aspect, there is provided a communication device comprising: a memory for storing instructions and a processor for executing the instructions stored by the memory and which, when executed by the processor, causes the processor to carry out the method of the second aspect or any alternative implementation of the second aspect.

In a seventh aspect, a computer storage medium is provided, in which program code is stored, and the program code is used to instruct execution of the method in the first aspect or any optional implementation manner of the first aspect.

In an eighth aspect, a computer storage medium is provided, in which program code is stored, the program code being for instructing execution of the method of the second aspect or any alternative implementation manner of the second aspect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art 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 that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a diagram of an application scenario according to an embodiment of the present application.

Fig. 2 is a schematic flow chart of a signal transmission method according to an embodiment of the present application.

Fig. 3 is a schematic diagram of an OFDM symbol requiring delay processing according to an embodiment of the present application.

Fig. 4 is a schematic diagram of an OFDM symbol requiring delay processing according to an embodiment of the present application.

Fig. 5 is a schematic flowchart of a configuration of delay processing for a remote radio node according to an embodiment of the present application.

Fig. 6 is a diagram of a scheduled time period allocation according to an embodiment of the present application.

Fig. 7 is a diagram of a scheduled time period allocation according to an embodiment of the present application.

Fig. 8 is a diagram of a scheduled time period allocation according to an embodiment of the present application.

Fig. 9 is a diagram of a scheduled time period allocation according to an embodiment of the present application.

Fig. 10 is a diagram of a latency processing scheme according to an embodiment of the present application.

Fig. 11 is a diagram of a latency processing scheme according to an embodiment of the present application.

Fig. 12 is a diagram of a latency processing scheme according to an embodiment of the present application.

Fig. 13 is a diagram of a latency processing scheme according to an embodiment of the present application.

Fig. 14 is a diagram of a latency processing scheme according to an embodiment of the present application.

Fig. 15 is a diagram of a latency processing scheme according to an embodiment of the present application.

Fig. 16 is a schematic diagram of obtaining a multi-path cluster of each remote radio node by performing matching on a delay profile according to an embodiment of the present application.

Fig. 17 is a schematic block diagram of a communication device according to an embodiment of the present application.

Fig. 18 is a schematic block diagram of a communication device according to an embodiment of the present application.

Fig. 19 is a schematic block diagram of a communication device according to an embodiment of the present application.

Fig. 20 is a schematic block diagram of a communication device according to an embodiment of the present application.

Detailed Description

As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).

Various aspects or features of the disclosure may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used herein is intended to encompass a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media can include but are not limited to magnetic storage devices (e.g., hard Disk, floppy Disk, magnetic strips, etc.), optical disks (e.g., CD (Compact Disk), DVD (Digital Versatile Disk), etc.), smart cards, and flash Memory devices (e.g., EPROM (Erasable Programmable Read-Only Memory), card, stick, or key drive, etc.). In addition, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.

Fig. 1 is a schematic diagram of a communication system used in an embodiment of the present application. As shown in fig. 1, the communication system 100 includes an uplink processing unit 101, a combining unit 102, a radio remote node 103, and a terminal device 104. The base station may include an uplink processing unit 101, a combining unit 102, and a radio remote node 103. The base station may be an evolved Node B (eNB or e-NodeB) in LTE, or a base station in 5G system, etc. The radio remote node 101, the combining unit 102, the baseband processing unit 103 and the functional unit 105 may transmit data through an optical fiber or a twisted pair. The Radio Remote node may be a Radio Remote Unit (RRU), for example, a pico RRU. The combining unit may be an rHUB, the uplink processing unit may acquire a signal sent by the remote radio node, demodulate the signal, and acquire a measurement amount from the demodulated signal, and the uplink processing unit may further schedule a resource for the terminal to send uplink data, and specifically, the uplink processing unit may be a BBU. Functional unit 105 may be a service anchor (SVA). The radio remote node 103 may communicate with a plurality of terminal devices (e.g., terminal device 104). The end devices 104 may be, for example, cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable device for communicating over the wireless communication system 100.

Some OFDM symbols of multiple radio remote nodes may be combined in a combining unit, if measurement information of the radio remote nodes needs to be obtained in an uplink processing unit, a source of a signal needs to be known, and the OFDM symbols of different radio remote nodes need to have different delays, so that delay processing needs to be performed, where the delay processing may be performed at the radio remote nodes or at the combining unit. The uplink processing unit matches the combined OFDM on the time delay spectrum to obtain the multi-path cluster of each radio remote node, and can obtain the measurement quantity of each radio remote node, and the measurement quantities can determine the coverage range of the radio remote node, position the terminal, and obtain the distribution of the thermal map.

The embodiment of the application can be applied to LTE system communication, A-LTE system communication, Wifi communication, 5G communication and the like.

How to transmit the signal of the remote radio node, specifically how to perform the delay processing on the OFDM symbol, will be described in detail below with reference to fig. 2 to 16.

Fig. 2 is a schematic flow chart diagram of a signal transmission method 200 according to an embodiment of the present application. The method 200 may be performed by the first remote radio node, or may be performed by the combining unit. The Radio Remote node mentioned in the embodiment of the present application may be a Radio Remote Unit (RRU), for example, a Pico RRU. The combining unit may be a rHub.

In 201, at least one first OFDM symbol that passes through a first remote radio node and needs to be sent to an uplink processing unit is obtained.

At 202, at least one second OFDM symbol is transmitted; the at least one second OFDM symbol is obtained by adding S zeros and removing the last S bit of the at least one first OFDM symbol in the time domain, wherein S is an integer greater than or equal to 1; or, the at least one second OFDM symbol is obtained by dividing each OFDM symbol of the at least one first OFDM symbol into a previous part and a next part in a time domain, and placing the previous part after the next part.

It should be understood that the first remote radio node may be any remote radio node that can communicate with the uplink processing unit.

In the embodiment of the present application, for simplicity of description and not limitation, a processing manner of transforming at least one first OFDM symbol into at least one second OFDM symbol is referred to as delay processing.

In the embodiment of the present application, the first OFDM symbol and the second OFDM symbol are only the first and the second OFDM symbols, and are only for describing to simply distinguish the source of the OFDM symbol and before and after the processing. For example, the OFDM symbol passing through the second radio remote node may be referred to as a third OFDM symbol, and the third OFDM symbol after the delay processing may be referred to as a fourth OFDM symbol.

In this embodiment of the present application, after obtaining the OFDM symbol, it may be determined whether the obtained OFDM symbol is an OFDM symbol that has passed through the first remote radio node and needs to be subjected to delay processing, where the OFDM symbol that needs to be subjected to delay processing is a partial OFDM symbol that has passed through the first remote radio node and is intended for the uplink processing unit. And if the OFDM symbol needs to be subjected to delay processing, performing delay processing.

The embodiment of the application can be applied to an LTE system, and the OFDM symbol to be subjected to the delay processing may be an OFDM symbol where Sounding Reference Signal (SRS) is located. For example, as shown in fig. 3, in a frame, there are 14 OFDM symbols, and only the last OFDM symbol (OFDM symbol where SRS is located) of the frame may be subjected to delay processing. The OFDM symbol where the SRS is located is delayed and combined, so that other OFDM symbols are not affected, and the overall influence on the system is small.

In the embodiment of the application, for a certain radio remote node, the delay processing may be performed on OFDM symbols where all SRSs received by the radio remote node are located, or may be performed only on OFDM symbols where SRSs received by the radio remote node in a part of time. For example, the delay processing may be performed only on the OFDM symbol where the SRS is received in all or part of the predetermined time period.

Of course, the delay processing may also be performed on all or part of other specific OFDM symbols in the predetermined time period, or the delay processing may be performed on all or part of OFDM symbols in the predetermined time period.

The predetermined time period mentioned here is a general term for the time period of carrying the OFDM symbol that needs to be delayed in the system. The division of the predetermined period of time may be case-specific. For example, as shown in fig. 4, the predetermined period is 3 periods out of every 7 consecutive periods, wherein any two predetermined periods out of the 3 predetermined periods are separated by at least one non-predetermined period. The predetermined period and the non-predetermined period shown in fig. 4 are each 40ms in length, but the present application is not limited thereto.

In the embodiment of the present application, the delay processing operation for a certain remote radio node may be performed only in a part of the predetermined time period.

For example, assuming that there are two remote radio nodes, namely, remote radio node 1 and remote radio node 2, the remote radio node 1 performs delay processing on a specific OFDM symbol in a predetermined time period 1, 3, 5 …, and the remote radio node 2 performs delay processing on a specific OFDM symbol in a predetermined time period 2, 4, 6 ….

In this embodiment of the present application, which predetermined time periods are used for which remote radio nodes to acquire measurement information thereof may be configured by the uplink processing unit. For example, as shown in the method 300 shown in fig. 5, in 301, the number of remote radio nodes that need to acquire measurement information is determined, and in 302, the remote radio nodes that need to acquire measurement information are grouped according to the number of remote radio nodes that need to acquire measurement information; in 303, different predetermined time periods are configured for remote radio node groups using the same transmit antenna, where the predetermined time periods are used for at least two remote radio nodes in the remote radio node group to transmit at least one OFDM symbol corresponding to each remote radio node, and the at least one OFDM symbol corresponding to each remote radio node has different delays.

Specifically, the remote radio nodes requiring to acquire measurement information may be grouped according to the number of remote radio nodes requiring to acquire measurement information, the number of cells to which the remote radio nodes belong, and the number of transmitting antennas; configuring a single antenna for each radio remote node group for transmission of a specific OFDM symbol (OFDM symbol needing delay processing); and configuring different preset time periods for the radio remote node group using the same transmitting antenna, and performing delay processing operation on the specific OFDM symbol and transmitting the specific OFDM symbol.

For example, assuming that the number of radio remote nodes that need to acquire measurement information is 2N, at most N radio remote nodes may distinguish signal sources by performing delay processing each time, and each radio remote node has two transmission antennas, namely antenna 0 and antenna 1 (that is, the system has two logic antennas, antenna 0 and antenna 1 in total), the radio remote nodes may be divided into two groups, the first group of radio remote nodes transmits data through antenna 0, the second group of radio remote nodes transmits data through antenna 1, and the two groups of nodes or the combining unit may perform delay processing on the specific OFDM symbols of the two groups of nodes in all predetermined time periods to combine and transmit the OFDM symbols.

For another example, assuming that the number of remote radio nodes that need to acquire measurement information is 4N, at most N remote radio nodes can distinguish signal sources by performing delay processing each time, and each remote radio node has two transmission antennas, namely an antenna 0 and an antenna 1, the remote radio nodes can be divided into four groups, the first and second remote radio nodes transmit data through the antenna 0, and the third and fourth remote radio nodes transmit data through the antenna 1. Since the first and second groups of remote radio nodes transmit data through the same antenna, different predetermined time periods need to be allocated to the two groups of remote radio nodes for performing delay processing and data transmission, and the third and fourth groups of remote radio nodes are similar. However, since the first, second, third and fourth sets of remote radio nodes transmit data through different antennas, there is no need to distinguish time periods. For example, a first group of radio remote nodes delay a specific OFDM symbol in a predetermined time period 1, 3, 5 …, a second group of radio remote nodes delay a specific OFDM symbol in a predetermined time period 2, 4, 6 …, a third group of radio remote nodes delay a specific OFDM symbol in a predetermined time period 1, 3, 5 …, and a fourth group of radio remote nodes delay a specific OFDM symbol in a predetermined time period 2, 4, 6 ….

For another example, in total, three cells are provided, the number of radio remote nodes that need to acquire measurement information in each cell is 4N, at most N radio remote nodes at each time can distinguish signal sources by performing delay processing, and each radio remote node is provided with two transmission antennas, namely, an antenna 0 and an antenna 1. The remote radio nodes corresponding to each cell may be divided into two groups, which may be 12 groups of remote radio nodes, six groups of remote radio nodes may transmit data through the antenna, and the other six groups of remote radio nodes may transmit data through the antenna 1. Different sets of remote radio nodes using the same antenna for transmitting data need to have different predetermined time periods for performing delay processing on a specific OFDM symbol and transmitting the OFDM symbol.

For another example, assuming that the number of radio remote nodes that need to acquire measurement information is N, at most N radio remote nodes can distinguish signal sources by performing delay processing each time, and each radio remote node has two transmission antennas, namely an antenna 0 and an antenna 1, the radio remote node may perform delay processing on a specific OFDM symbol in all predetermined time periods and transmit the OFDM symbol.

In the embodiment of the application, the data of each radio remote node is transmitted in a single antenna mode, so that the uplink processing unit can acquire more information of the radio remote nodes.

In this embodiment of the present application, after receiving an OFDM symbol that needs to be subjected to delay processing in a certain predetermined time period, a specific OFDM symbol received in M-1 predetermined time periods that are consecutive after the specific OFDM symbol is discarded, where M is the number of remote radio node groups, the M remote radio node groups send the OFDM symbol subjected to delay processing through the same antenna, and M is greater than or equal to 2.

In the embodiment of the present application, the M groups of remote radio nodes have the same antenna configuration. For example, antenna 0 is configured to be used by the M groups of remote radio nodes to transmit OFDM symbols that need to be subjected to delay processing, and

antennas

In this embodiment of the present application, a certain radio remote node or a combining unit may store at least one OFDM symbol of the radio remote node received in a first predetermined time period to a second predetermined time period for performing delay processing; and transmitting the at least one OFDM symbol subjected to the delay processing in a second predetermined time period, wherein the first predetermined time period is different from the second predetermined time period.

Or, a certain radio remote node or combining unit may perform, in a first predetermined time period, delay processing on at least one OFDM symbol of the radio remote node received in the first predetermined time period; and transmitting the at least one OFDM symbol after the delay processing in the first preset time period.

That is to say, for a specific OFDM symbol of a certain radio remote node, the currently received OFDM symbol which needs to be processed may be delayed and transmitted in a current predetermined time period, or the OFDM symbol which needs to be processed and received in a certain predetermined time period may be stored in another predetermined time period and delayed and transmitted. Both of these cases will be described below in conjunction with fig. 6-9.

For example, assuming that the number of radio remote nodes that need to acquire measurement information is 4N, at most N radio remote nodes can distinguish signal sources by performing delay processing each time, and each radio remote node has two transmission antennas, namely an antenna 0 and an antenna 1, the radio remote nodes can be divided into four groups, the first and second groups of radio remote nodes transmit data through the antenna 0, and the third and fourth groups of radio remote nodes transmit data through the antenna 1. Assume that the data combined by the first group of remote radio nodes is data 0, and the data combined by the second group of remote radio nodes is data 1. The two sets of data combined by the remote radio nodes may be transmitted through the antenna 0 in two polling manners as shown in fig. 6 and fig. 7, where the combined data 0 represents the data combined by the first set of remote radio nodes, and the combined data 1 represents the data combined by the second set of remote radio nodes. The data transmission modes of the third group and the fourth group of remote radio nodes are similar and are not described again.

As shown in fig. 6, transmitting, at a predetermined time period 0, combined data of a specific OFDM symbol received by a first group of radio remote nodes within the predetermined time period 0, and discarding the specific OFDM symbol of a second group of radio remote nodes received within the predetermined time period 0; transmitting the combined data of the specific OFDM symbols received by the second group of radio remote nodes in the preset time period 1, and discarding the specific OFDM symbols of the first group of radio remote nodes received in the preset time period 1; and transmitting the combined data of the specific OFDM symbols received by the first group of radio remote nodes in the predetermined time period 2, discarding the specific OFDM symbols of the second group of radio remote nodes received in the predetermined time period 2, and so on.

As shown in fig. 7, the combined data of the specific OFDM symbol received by the first group of radio remote node in the predetermined time period 0 is transmitted in the predetermined time period 0, and the specific OFDM symbol of the second group of radio remote node received in the predetermined time period 0 is stored in the predetermined time period 1; transmitting combined data of the specific OFDM symbols received by the second group of radio remote nodes in the preset time period 0 in the preset time period 1, and discarding the specific OFDM symbols of the first group and the second group of radio remote nodes received in the preset time period 1; transmitting combined data of a specific OFDM symbol received by a first group of radio remote node in a preset time period 2, and storing the data of a second group of radio remote nodes received in the preset time period 2 to a preset time period 3; transmitting the combined data of the specific OFDM symbols received by the second group of radio remote nodes in the preset time period 2 in the preset time period 3, and discarding the specific OFDM symbols of the first group and the second group of radio remote nodes received in the preset time period 3; and so on.

Assuming that there are three cells, the number of radio remote nodes in each cell that need to acquire measurement information is 4N, at most N radio remote nodes at a time can distinguish signal sources by delay processing, and each radio remote node has two transmission antennas, namely antenna 0 and antenna 1. The remote radio nodes corresponding to each cell may be divided into two groups, which may be 12 groups of remote radio nodes, assuming that the first to sixth groups of remote radio nodes transmit data through the antenna 0, and the 7 th to 12 th groups of remote radio nodes transmit data through the antenna 1. The data of the six groups of remote radio nodes may be transmitted through the antenna 0 by two polling manners as shown in fig. 8 and fig. 9, where the combined data 0 represents combined data of a specific OFDM symbol of a first group of remote radio nodes, the combined data 1 represents combined data of a specific OFDM symbol of a second group of remote radio nodes, the combined data 2 represents combined data of a specific OFDM symbol of a third group of remote radio nodes, the combined data 3 represents combined data of a specific OFDM symbol of a fourth group of remote radio nodes, the combined data 4 represents combined data of a specific OFDM symbol of a fifth group of remote radio nodes, and the combined data 5 represents combined data of a specific OFDM symbol of a sixth group of remote radio nodes. The data transmission mode of other six remote radio nodes through the antenna 1 is similar and will not be described again.

As shown in fig. 8, the combined data of the specific OFDM symbol received by the first group of radio remote node in the predetermined time period 0 is transmitted in the predetermined time period 0, and the specific OFDM symbols of the other five groups of radio remote nodes received in the predetermined time period 0 are discarded; transmitting the combined data of the specific OFDM symbols received by the second group of radio remote nodes in the preset time period 1, and discarding the specific OFDM symbols of the other five groups of radio remote nodes received in the preset time period 1; transmitting the combined data of the specific OFDM symbols received by the third group of radio remote nodes in the preset time period 2, and discarding the specific OFDM symbols of the other five groups of radio remote nodes received in the preset time period 2; transmitting the combined data of the specific OFDM symbols received by the fourth group of radio remote node in the predetermined time period 3, and discarding the specific OFDM symbols of the other five groups of radio remote nodes received in the predetermined time period 3; transmitting the combined data of the specific OFDM symbols received by the fifth group of radio remote node in the preset time period 4, and discarding the specific OFDM symbols of the other five groups of radio remote nodes received in the preset time period 4; transmitting the data combined by the specific OFDM symbols received by the sixth group of radio remote nodes in the preset time period 5, and discarding the specific OFDM symbols of the other five groups of radio remote nodes received in the preset time period 5; transmitting the data of the combined specific OFDM symbols received by the first group of radio remote nodes in the preset time period 6, and discarding the specific OFDM symbols of the other five groups of radio remote nodes received in the preset time period 6; and so on.

As shown in fig. 9, the combined data of the specific OFDM symbol received by the first group of radio remote node in the predetermined time period 0 is transmitted in the predetermined time period 0, and the specific OFDM symbols of the other five groups of radio remote nodes received in the predetermined time period 0 are stored; transmitting the combined data of the specific OFDM symbols received by the second group of remote radio nodes in the preset time period 0 in the preset time period 1, and discarding the specific OFDM symbols of the six groups of nodes received in the preset time period 1; transmitting the combined data of the specific OFDM symbols received by the third group of radio remote nodes in the predetermined time period 0 in the predetermined time period 2, and discarding the specific OFDM symbols of the six groups of nodes received in the predetermined time period 2; transmitting the combined data of the specific OFDM symbols received by the fourth group of remote radio nodes in the predetermined time period 0 in the predetermined time period 3, and discarding the specific OFDM symbols of the six groups of nodes received in the predetermined time period 3; transmitting the combined data of the specific OFDM symbols received by the fifth group of remote radio nodes in the predetermined time period 0 in the predetermined time period 4, and discarding the specific OFDM symbols of the six groups of nodes received in the predetermined time period 4; transmitting the combined data of the specific OFDM symbols received by the sixth group of remote radio nodes in the predetermined time period 0 in the predetermined time period 5, and discarding the specific OFDM symbols of the six groups of nodes received in the predetermined time period 5; transmitting combined data of a specific OFDM symbol received by the first group of radio remote node in a preset time period 6, and storing the specific OFDM symbol of other five groups of radio remote nodes received in the preset time period 6; transmitting the combined data of the specific OFDM symbols received by the second group of remote radio nodes in the predetermined time period 7, and discarding the specific OFDM symbols of the six groups of nodes received in the predetermined time period 7; and so on.

In the embodiment of the application, the remote radio nodes are subjected to delay processing and combined transmission by adopting the polling mode, more measurement information of the remote radio nodes can be acquired, each polling period is shorter than the previous measurement period, and the method is particularly suitable for a scene in which the measurement information of the remote radio nodes in the adjacent cell needs to be acquired.

It has been explained above how to group the remote radio nodes, and each group needs to delay when and how to combine and transmit a specific OFDM symbol in which time period. The following describes how to perform delay processing and combining on a group of remote radio nodes.

In the embodiment of the present application, data of each group of remote radio nodes may be transmitted through a single antenna, or may be transmitted through multiple antennas (e.g., dual antennas).

If the transmission is performed through the dual antennas, the delay processing may be performed for any group of remote radio nodes in the manner shown in fig. 10. As shown in fig. 10, assuming that there are n nodes, the data of each remote radio node is transmitted through the dual antennas, the data of each antenna of the same remote radio node is subjected to the same delay processing, and different remote radio nodes have different delays, i.e. T1 and T2 … Tn.

If the transmission is performed through a single antenna, the delay processing may be performed for any group of remote radio nodes in the manner shown in fig. 11. Each logical antenna transmits data of a group of remote radio nodes in each predetermined time period, and the remote radio nodes in each group of remote radio nodes have different delays, namely T1 and T2 … Tn.

In the embodiment of the present application, two delay processing modes, namely zero padding truncation and cyclic shift, may be adopted. The zero padding truncation process may perform zero padding truncation with at least one OFDM symbol as a whole.

The zero padding and truncation processing method includes adding S zeros in front of a most front cyclic prefix of at least one OFDM symbol, and removing a last S bit of the at least one OFDM symbol, where, in order to enable different remote radio nodes to have different delays, values of S may be different for different remote radio nodes.

In the embodiment of the present application, the length of S may be less than or equal to the length of CP, so that the integrity of the delayed OFDM symbol may be ensured, and system performance degradation caused by delay may be avoided.

The cyclic shift processing mode is to place a previous part of each OFDM symbol of at least one OFDM symbol after a next part of the OFDM symbol, where the previous part of the OFDM symbol may be a part of the CP, all of the CP, or all and part of the OFDM samples of the CP.

For example, as shown in fig. 12, it is assumed that zero padding truncation processing is performed on one OFDM symbol, no processing is performed on the OFDM symbol of the node 1, one zero is padded before the cyclic shift of the OFDM symbol of the node 2, and the last bit of the OFDM symbol of the node 2 is truncated, that is, removed, two zeros are padded before the cyclic shift of the OFDM symbol of the node 3, the last two bits of the OFDM symbol of the node 2 are truncated, and so on, the longest length of the node zero padding may not be greater than the CP length.

For example, as shown in fig. 13, it is assumed that zero padding and truncation processing is performed on two OFDM symbols, no processing is performed on two OFDM symbols of the node 1, zero is padded before cyclic shift of OFDM symbol before two OFDM symbols of the node 2, and the last bit of OFDM symbol after the node 2 is truncated, that is, removed, two zeros are padded before cyclic shift of OFDM symbol before two OFDM symbols of the node 3, and the last two bits of OFDM symbol after the node 2 are truncated, and so on, the longest length of the node zero padding may not be greater than the CP length.

The cyclic shift process places samples of a previous part of an OFDM symbol after samples of a next part of the OFDM symbol while keeping the time occupied by the OFDM symbol unchanged.

For example, as shown in fig. 14, the OFDM symbol of node 1 is not processed, the first two bits of CP of the OFDM symbol of node 2 are placed behind the OFDM symbol, the first two bits of CP of the OFDM symbol of node 3 are placed behind the OFDM symbol, and so on. The shifted data may be a cyclic prefix of the OFDM symbol or a cyclic prefix of the OFDM symbol and a data sample of the OFDM symbol.

In the embodiment of the present application, the zero padding truncation process and the cyclic shift process may be simultaneously used in a group of radio remote nodes. For example, as shown in fig. 15, the OFDM symbol of node 1 is not processed, the bit before the CP of the OFDM symbol of node 2 is placed behind the OFDM symbol, two zeros are added before the CP of the OFDM symbol of node 3, and the last two bits of the OFDM symbol are truncated.

In the embodiment of the application, by adopting cyclic shift processing or zero padding truncation processing, the uplink processing unit can acquire information of a plurality of radio remote nodes, and can only perform delayed combining processing on part of OFDM symbols, without affecting other OFDM symbols.

In this embodiment of the present application, the delay processing may be performed by each remote radio node itself, and then the OFDM symbols subjected to the delay processing are sent to the combining unit, and the combining unit performs combining processing on the OFDM symbols subjected to the delay processing by each remote radio node and sends the combined OFDM symbols to the uplink processing unit.

Or, the delay processing may be performed by the combining unit, where the combining unit performs delay processing on the OFDM symbols of each radio remote node, performs combining processing on each delayed OFDM symbol, and sends the combined OFDM symbol to the uplink processing unit.

In this embodiment of the present application, the uplink processing unit may be a BBU.

In this embodiment of the application, after the OFDM symbol after being combined is sent to the uplink processing unit, the uplink processing unit may match a multi-path cluster corresponding to each node on the delay spectrum according to the delay of the radio remote node, so as to obtain a signal sent by each node. For example, as shown in fig. 16, where Δ τ represents the delay, the multiple before it represents the different delays.

The uplink processing unit may obtain a measurement quantity of each node, such as Reference Signal Receiving Power (RSRP), Signal to Interference plus Noise Ratio (SINR), Time of arrival (TOA), and the like, according to a Signal sent by each node. Specifically, the uplink processing unit may obtain RSRP and SINR according to a time-frequency domain power statistics method, and obtain TOA through a music algorithm.

The functional unit can then carry out the relevant function on the basis of the respective measurement quantities. For example, the functional unit may determine a coverage of the RRU and locate the terminal according to RSRP and TOA, obtain a special map distribution according to RSRP and SINR, and the like.

The signal transmission method according to the embodiment of the present application has been described above with reference to fig. 1 to 16. A communication apparatus according to an embodiment of the present application is described below with reference to fig. 17 to 20.

Fig. 17 is a schematic block diagram of a communication device 400 according to an embodiment of the present application. As shown in fig. 16, the communication apparatus 400 includes: an obtaining module 410, configured to obtain at least one first OFDM symbol that passes through a first remote radio node and needs to be sent to an uplink processing unit; a transmitting module 420 for transmitting at least one second OFDM symbol; the at least one second OFDM symbol is obtained by adding S zeros before the at least one first OFDM symbol in a time domain and removing the last S bits of the at least one first OFDM symbol, wherein S is an integer greater than or equal to 1; or, the at least one second OFDM symbol is obtained by dividing each OFDM symbol of the at least one first OFDM symbol into a previous part and a next part in a time domain, and placing the previous part after the next part.

Optionally, the communication device 400 is applied to a long term evolution LTE system, and the first OFDM symbol is an OFDM symbol where a sounding reference signal SRS is located.

Optionally, the first OFDM symbol is a specific OFDM symbol carried within a predetermined time period, wherein a time interval exists between every two predetermined time periods.

Optionally, the obtaining module 410 is further configured to: after receiving the first OFDM symbol passing through the first radio remote node in a first predetermined time period, discarding the first OFDM symbol passing through the first radio remote node in M-1 predetermined time periods, where M is the number of radio remote node groups, the M radio remote node groups have the same transmit antenna configuration, and M is an integer greater than or equal to 2.

Optionally, the sending module 420 is specifically configured to:

transmitting the at least one second OFDM symbol for a second predetermined time period, wherein the second predetermined time period is different from the first predetermined time period.

Optionally, the S is less than or equal to a length of a cyclic prefix of the first OFDM symbol.

Optionally, the communication device 400 is a first remote radio node, and the sending module 420 is specifically configured to:

and sending the at least one second OFDM symbol to the combining unit through a single antenna.

Optionally, the communication device 400 is a combining unit; the obtaining module 410 is further configured to obtain at least one third OFDM symbol that passes through a second remote radio node and needs to be sent to the uplink processing unit; the transmitting module 420 is further configured to transmit at least one fourth OFDM symbol; the at least one second OFDM symbol and the at least one fourth OFDM symbol are sent to the uplink processing unit in a combined manner, where the at least one second OFDM symbol and the at least one fourth OFDM symbol have different delays; the at least one fourth OFDM symbol is obtained by adding R zeros before the at least one third OFDM symbol in the time domain and removing the last R bit of the at least one third OFDM symbol, wherein R is an integer greater than or equal to 1; or, the at least one fourth OFDM symbol is obtained by dividing each OFDM symbol of the at least one fourth OFDM symbol into a previous part and a next part in a time domain, and placing the previous part after the next part.

The communication device 400 according to the embodiment of the present application may correspond to a radio remote node or a combining unit in the method according to the embodiment of the present application, and each unit, i.e., a module, and the other operations and/or functions in the communication device are respectively for implementing the corresponding process of the method 100 in fig. 2, and are not described herein again for brevity.

Fig. 18 is a schematic block diagram of a communication device 500 according to an embodiment of the present application. As shown in fig. 18, the communication device 500 includes: a determining module 510, configured to determine the number of radio remote nodes that need to acquire measurement information; a grouping module 520, configured to group the remote radio nodes that need to acquire measurement information according to the number of the remote radio nodes that need to acquire measurement information; a configuring module 530, configured to configure different predetermined time periods for remote radio node groups using the same transmitting antenna, where the predetermined time periods are used for at least two remote radio nodes in the remote radio node group to transmit at least one OFDM symbol corresponding to each remote radio node, and the at least one OFDM symbol corresponding to each remote radio node has different delays.

Optionally, the configuration module 530 is further configured to: configuring the following processing for at least one OFDM symbol corresponding to each radio remote node in at least one radio remote node of the radio remote node group: the processing comprises adding at least one zero before the at least one OFDM symbol in time domain and removing at least one bit of the at least one OFDM symbol, wherein the number of bits added with zero is the same as the length of the removed number of bits; or, each OFDM symbol of the at least one OFDM symbol is divided into a previous part and a next part in a time domain, and the previous part is placed after the next part.

Optionally, the determining module 510 is further configured to: determining the number of cells to which radio remote nodes needing to acquire measurement information belong and the number of transmitting antennas; the grouping module 520 is specifically configured to: grouping the remote radio nodes needing to acquire the measurement information according to the number of the remote radio nodes needing to acquire the measurement information, the number of cells to which the remote radio nodes belong and the data of the transmitting antenna; the configuration module 530 is further configured to: and configuring a single antenna for each remote radio node group to be used for transmitting the OFDM symbols corresponding to each remote radio node.

Optionally, the communication device 500 is applied to a long term evolution LTE system, and the OFDM symbol is an OFDM symbol where a sounding reference signal SRS is located.

The communication device 500 according to the embodiment of the present application may correspond to the uplink processing unit in the method according to the embodiment of the present application, and each unit, i.e., the module, and the other operations and/or functions described above in the communication device are respectively for implementing the corresponding flow of the method 300 in fig. 5, and are not described again here for brevity.

Fig. 19 is a schematic block diagram of a communication device 600 according to an embodiment of the present application. As shown in fig. 19, the communication device 600 includes a processor 610 and a transceiver 620. The processor 610 is coupled to the transceiver 620, optionally the device 500 further comprises a memory 630, the memory 630 being coupled to the processor 610, further optionally the device 600 comprises a bus system 640. Wherein the processor 610, the memory 630, and the transceiver 620 may be coupled via the bus system 640, the memory 630 may be configured to store instructions, and the processor 510 may be configured to execute the instructions stored by the memory 530.

The processor 610 obtains, through the transceiver 620, at least one first OFDM symbol that passes through the first remote radio node and needs to be sent to the uplink processing unit; the processor 610 transmits at least one second OFDM symbol through the transceiver 620; the at least one second OFDM symbol is obtained by adding S zeros before the at least one first OFDM symbol in a time domain and removing the last S bits of the at least one first OFDM symbol, wherein S is an integer greater than or equal to 1; or, the at least one second OFDM symbol is obtained by dividing each OFDM symbol of the at least one first OFDM symbol into a previous part and a next part in a time domain, and placing the previous part after the next part.

Optionally, the communication device 600 is applied to a long term evolution LTE system, and the first OFDM symbol is an OFDM symbol where a sounding reference signal SRS is located.

Optionally, the processor 610 discards M-1 consecutive OFDM symbols passing through the first radio remote node within a predetermined time period after receiving the first OFDM symbol passing through the first radio remote node by the transceiver 620 for a first predetermined time period, where M is the number of radio remote node groups, the M radio remote node groups have the same transmit antenna configuration, and M is an integer greater than or equal to 2.

Optionally, the processor 610 transmits the at least one second OFDM symbol via the transceiver 620 for a second predetermined time period, wherein the second predetermined time period is different from the first predetermined time period.

Optionally, the communication device is a first remote radio node, and the processor 610 sends the at least one second OFDM symbol to the combining unit through the transceiver by using a single antenna.

Optionally, the communication device 600 is a combining unit; the processor 610 is further configured to obtain, through the transceiver 620, at least one third OFDM symbol that passes through the second remote radio node and needs to be sent to the uplink processing unit, and send at least one fourth OFDM symbol; the at least one second OFDM symbol and the at least one fourth OFDM symbol are sent to the uplink processing unit in a combined manner, where the at least one second OFDM symbol and the at least one fourth OFDM symbol have different delays; the at least one fourth OFDM symbol is obtained by adding R zeros before the at least one third OFDM symbol in the time domain and removing the last R bit of the at least one third OFDM symbol, wherein R is an integer greater than or equal to 1; or, the at least one fourth OFDM symbol is obtained by dividing each OFDM symbol of the at least one fourth OFDM symbol into a previous part and a next part in a time domain, and placing the previous part after the next part.

The communication device 600 according to the embodiment of the present application may correspond to a radio remote node or a combining unit in the method according to the embodiment of the present application, and each unit, i.e., a module, and the other operations and/or functions in the communication device are respectively for implementing the corresponding process of the method 200 in fig. 2, and are not described herein again for brevity.

Fig. 20 is a schematic block diagram of a communication device 700 according to an embodiment of the present application. As shown in fig. 20, the communication device 700 includes a processor and a transceiver. The processor 710 is coupled to the transceiver 720. optionally, the device 700 further comprises a memory 730. the memory 730 is coupled to the processor 710. further optionally, the device 700 comprises a bus system 740. Wherein the processor 710, the memory 730, and the transceiver 720 may be coupled by a bus system 740, the memory 730 may be configured to store instructions, the processor 710 may be configured to execute the instructions stored by the memory 730,

the processor 710 determines the number of remote radio nodes that need to acquire measurement information; grouping the remote radio nodes needing to acquire the measurement information according to the number of the remote radio nodes needing to acquire the measurement information; configuring different predetermined time periods for remote radio node groups using the same transmitting antenna, wherein the predetermined time periods are used for at least two remote radio nodes in the remote radio node groups to transmit at least one OFDM symbol corresponding to each remote radio node, and the at least one OFDM symbol corresponding to each remote radio node has different time delays.

Optionally, the processor 710 configures, for at least one OFDM symbol corresponding to each remote radio node in at least one remote radio node of the remote radio node group, the following processes: the processing comprises adding at least one zero before the at least one OFDM symbol in time domain and removing at least one bit of the at least one OFDM symbol, wherein the number of bits added with zero is the same as the length of the removed number of bits; or, each OFDM symbol of the at least one OFDM symbol is divided into a previous part and a next part in a time domain, and the previous part is placed after the next part.

Optionally, the processor 710 determines the number of cells to which the remote radio node that needs to obtain the measurement information belongs and the number of transmitting antennas; the grouping of the remote radio nodes needing to acquire measurement information includes: grouping the remote radio nodes needing to acquire the measurement information according to the number of the remote radio nodes needing to acquire the measurement information, the number of cells to which the remote radio nodes belong and the data of the transmitting antenna; and configuring a single antenna for each remote radio node group to be used for transmitting the OFDM symbols corresponding to each remote radio node.

Optionally, the communication device 700 is applied to a long term evolution LTE system, and the OFDM symbol is an OFDM symbol where a sounding reference signal SRS is located.

The communication device 700 according to the embodiment of the present application may correspond to the uplink processing unit in the method according to the embodiment of the present application, and each unit, i.e. the module, and the other operations and/or functions described above in the communication device are respectively for implementing the corresponding flow of the method 300 in fig. 5, and are not described again here for brevity.

In the embodiment of the present application, the processor 610 or 710 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of the CPU and the NP. The processor 610 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.

The

bus system

640 or 740 may include a power bus, a control bus, a status signal bus, and the like, in addition to a data bus. For ease of illustration, the

bus system

640 or 740 is shown with only one thick line, but does not indicate only one bus or type of bus.

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

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

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

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

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned 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.

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

Claims

1. A signal transmission method, comprising:

acquiring at least one first Orthogonal Frequency Division Multiplexing (OFDM) symbol which passes through a first radio remote node and needs to be sent to an uplink processing unit, wherein the at least one first OFDM symbol is sent by combining and has different delays;

transmitting at least one second OFDM symbol;

the at least one second OFDM symbol is obtained by adding S zeros before the at least one first OFDM symbol in a time domain and removing the last S bit of the at least one first OFDM symbol, wherein S is an integer greater than or equal to 1; or, the at least one second OFDM symbol is obtained by dividing each OFDM symbol of the at least one first OFDM symbol into a previous part and a next part in a time domain, and placing the previous part after the next part.

2. The method of claim 1, wherein the method is applied to a Long Term Evolution (LTE) system, and the first OFDM symbol is an OFDM symbol where a Sounding Reference Signal (SRS) is located.

3. The method according to claim 1 or 2, wherein the first OFDM symbol is a specific OFDM symbol carried within a predetermined time period, wherein a time interval exists between every two predetermined time periods.

4. The method of claim 3, further comprising:

after receiving the first OFDM symbol passing through the first remote radio node in a first preset time period, discarding the first OFDM symbol passing through the first remote radio node in M-1 preset time periods, wherein M is the number of remote radio node groups, the M remote radio node groups have the same transmitting antenna configuration, and M is an integer greater than or equal to 2.

5. The method of claim 4, wherein transmitting at least one second OFDM symbol comprises:

6. The method of claim 1 or 2, wherein S is equal to or less than a length of a cyclic prefix of the first OFDM symbol.

7. The method according to claim 1 or 2, wherein the method is performed by the first remote radio node, and wherein the transmitting at least one second OFDM symbol comprises:

8. The method according to claim 1 or 2,

the method is performed by a combining unit, the method further comprising:

acquiring at least one third OFDM symbol which passes through a second remote radio node and needs to be sent to the uplink processing unit;

transmitting at least one fourth OFDM symbol;

the at least one second OFDM symbol and the at least one fourth OFDM symbol are sent to the uplink processing unit in a combined manner, wherein the at least one second OFDM symbol and the at least one fourth OFDM symbol have different delays;

the at least one fourth OFDM symbol is obtained by adding R zeros before the at least one third OFDM symbol in a time domain and removing the last R bit of the at least one third OFDM symbol, wherein R is an integer greater than or equal to 1; or, the at least one fourth OFDM symbol is obtained by dividing each OFDM symbol of the at least one fourth OFDM symbol into a previous part and a next part in a time domain, and placing the previous part after the next part.

9. A communication device, comprising:

an obtaining module, configured to obtain at least one first OFDM symbol that passes through a first remote radio node and needs to be sent to an uplink processing unit, where the at least one first OFDM symbol is sent by combining and has different delays;

a transmitting module for transmitting at least one second OFDM symbol;

10. The communication device according to claim 9, wherein the communication device is applied to a long term evolution LTE system, and the first OFDM symbol is an OFDM symbol where a Sounding Reference Signal (SRS) is located.

11. The communication device according to claim 9 or 10, wherein the first OFDM symbol is a specific OFDM symbol carried within a predetermined time period, wherein a time interval exists between every two predetermined time periods.

12. The communications device of claim 11, wherein the obtaining module is further configured to:

13. The communications device of claim 12, wherein the sending module is specifically configured to:

14. The communications device of claim 9 or 10, wherein S is equal to or less than the length of the cyclic prefix of the first OFDM symbol.

15. The communication device according to claim 9 or 10, wherein the communication device is the first remote radio node, and the sending module is specifically configured to:

16. The communication device of claim 9 or 10, being a combining unit;

the acquiring module is further configured to acquire at least one third OFDM symbol that passes through a second remote radio node and needs to be sent to the uplink processing unit;

the transmitting module is further configured to transmit at least one fourth OFDM symbol;