CN112929764B

CN112929764B - Signal transmission method, device, system and storage medium

Info

Publication number: CN112929764B
Application number: CN202011637582.6A
Authority: CN
Inventors: 徐慧俊; 方绍湖; 黄文昌
Original assignee: Comba Network Systems Co Ltd
Current assignee: Comba Network Systems Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2022-11-29
Anticipated expiration: 2040-12-31
Also published as: CN112929764A

Abstract

The application relates to a signal transmission method, equipment, a system and a storage medium, wherein a host unit acquires a transmission signal to be sent to a target cell through a physical layer channel; then, according to preset cell configuration parameters, selecting a target optical port in communication connection with the physical layer channel from a plurality of optical ports of the host unit; transmitting the transmission signal to a target expansion unit corresponding to the target optical port through the target optical port so as to send the transmission signal to a target cell through the target expansion unit; wherein, different optical ports are in communication connection with different extension units. By adopting the method, the antenna port corresponding to the transmission signal of the target cell can be flexibly adjusted, and the technical requirement of multiple antennas in a 5G system is met.

Description

Signal transmission method, device, system and storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method, a unit, a device, and a storage medium for transmitting a channel signal.

Background

With the rapid development of science and technology, a fifth generation mobile communication system (5 th generation wireless systems, 5G for short) is widely applied to the fields of live broadcast of large-scale events, remote training, remote medical treatment and the like. In an application scenario with high transmission rate and low time delay in 5G, many signal transmission services are applied to indoor environments, such as services of ultra high definition video, virtual Reality (VR), augmented Reality (AR), and the like, and indoor coverage can be achieved by using an indoor distribution base station.

In a conventional method, when an indoor sub-base station configures antennas for cells, the number of antennas corresponding to one cell is often limited by a corresponding relationship between the physical layer channels in the cell and the indoor sub-base station, that is, after the physical layer channel corresponding to one cell is determined, an extension unit and a remote unit in the indoor sub-base station corresponding to the cell are also determined at the same time, and further, the number of antennas covering the cell is also fixed accordingly. Therefore, the indoor base station in the conventional technology cannot meet the multi-antenna technology requirement in the 5G system.

Disclosure of Invention

In view of the above, it is necessary to provide a signal transmission method, device, system and storage medium for solving the above technical problems.

A signal transmission method is applied to a host unit in base station equipment, and comprises the following steps:

acquiring a transmission signal to be sent to a target cell through a physical layer channel of a host unit;

selecting a target optical port in communication connection with a physical layer channel from a plurality of optical ports of a host unit according to preset cell configuration parameters; different optical ports are in communication connection with different extension units;

and transmitting the transmission signal to a target expansion unit corresponding to the target optical port through the target optical port so as to send the transmission signal to the target cell through the target expansion unit.

In one embodiment, the transmitting the transmission signal to the target expansion unit corresponding to the target optical port through the target optical port includes:

determining a transmission path from a physical layer channel to a target optical port according to the target optical port;

and transmitting the transmission signal to the target optical port through the transmission path, so that the target optical port transmits the target transmission signal to the target expansion unit.

In one embodiment, before sending the transmission signal to the target optical port through the transmission path, the method further includes:

carrying out route adaptation processing on the transmission signal according to the transmission configuration of the target extension unit; the transmission configuration includes the transmission bit width and the sampling rate of the target expansion unit.

In one embodiment, the selecting the target optical port in communication connection with the physical layer channel from the plurality of optical ports of the host unit includes:

and determining the optical port connected with the target expansion unit as a target optical port according to the identification of the target expansion unit.

In one embodiment, the cell configuration parameter includes the number of remote units corresponding to the target cell and/or the number of antenna ports corresponding to the target cell.

acquiring the number of remote units connected with each extension unit connected with the host unit;

selecting at least one target expansion unit matched with the cell configuration parameters from the plurality of expansion units according to the number of the remote units connected with each expansion unit;

and determining the optical port of at least one target expansion unit as a target optical port.

acquiring the number of antenna ports of a remote unit connected with each expansion unit connected with the host unit;

selecting at least one target expansion unit matched with the cell configuration parameters from the plurality of expansion units according to the number of antenna ports of the remote unit connected with each expansion unit;

acquiring a first number of remote units connected with each expansion unit and a second number of antenna ports of each remote unit;

selecting at least one target expansion unit matched with the cell configuration parameters from the plurality of expansion units according to the first quantity and the second quantity corresponding to each expansion unit;

In one embodiment, the method further includes:

sending a routing indication to a target expansion unit through a target optical port; the route indication is used to indicate a target extension unit, select at least one target remote unit among a plurality of remote units connected to the target extension unit, and send a transmission signal to the target cell through the target remote unit.

In one embodiment, the routing indication includes an identifier of the target remote unit, and the identifier of the target remote unit is used to instruct the target expansion unit to send the transmission signal to the target remote unit matching the identifier.

In one embodiment, the routing indication includes the number of target remote units and/or the number of antenna ports corresponding to the target cell; the route indication is used to instruct the target expansion unit to select at least one target remote unit matching the route indication and to send the transmission signal to the target remote unit.

In one embodiment, the physical layer channel includes a plurality of physical layer channels; the transmission signal comprises a transmission data stream output by a physical layer channel of at least one standard.

In one embodiment, the physical layer channel includes a first physical layer channel disposed in the host unit and/or a second physical layer channel connected to the host unit through the optical port.

A host unit is applied to a base station and comprises at least one physical layer channel, a routing module and a plurality of optical ports connected with the routing module; different optical ports are in communication connection with different extension units;

the physical layer channel is used for acquiring a transmission signal to be sent to a target cell;

and the routing module is used for selecting a target optical port in communication connection with the physical layer channel from a plurality of optical ports of the host unit according to preset cell configuration parameters, and transmitting the transmission signal to a target expansion unit corresponding to the target optical port through the target optical port.

In one embodiment, the routing module is configured to implement the steps of the signal transmission method.

A signal transmission method is applied to an extension unit in a base station, and comprises the following steps:

receiving a transmission signal of a target cell sent by a host unit through a target optical port; the transmission signal is transmitted to the target optical port through a transmission path between the physical layer channel and the target optical port; the target optical port is a target optical port which is selected by the host unit from a plurality of optical ports of the host unit to be in communication connection with the physical layer channel according to preset cell configuration parameters; different optical ports are in communication connection with different extension units;

and transmitting the transmission signal to the target cell.

In one embodiment, the sending the transmission signal to the target cell includes:

acquiring a first routing instruction sent by a host unit;

selecting at least one target remote unit among the plurality of remote units connected to the expansion unit in accordance with the first routing indication;

the transmission signal is transmitted to the target cell by at least one target remote unit.

In one embodiment, said first routing indication comprises an identification of the target remote unit; selecting at least one target remote unit among a plurality of remote units connected to the expansion unit, comprising:

and determining the remote unit corresponding to the identifier as a target remote unit of the target cell.

In one embodiment, the first routing indication includes the number of target remote units and/or the number of antenna ports corresponding to the target cell.

In one embodiment, the selecting at least one target remote unit from the plurality of remote units connected to the extension unit if the first routing indication includes the number of target remote units includes:

at least one target remote unit matching the number of target remote units is selected among the plurality of remote units based on the number of target remote units.

In one embodiment, if the first routing indication includes the number of antenna ports corresponding to the target cell, selecting at least one target remote unit from a plurality of remote units connected to the extension unit includes:

respectively acquiring the number of antenna ports of each remote unit connected with the expansion unit;

selecting at least one target remote unit from the plurality of remote units that matches the number of antenna ports corresponding to the target cell based on the number of antenna ports of each remote unit.

In one embodiment, before the transmitting the transmission signal to the target cell by the at least one target remote unit, the method further includes:

transmitting a second routing indication to the target remote unit; the second routing indication is used to instruct the target remote unit to select at least one target radio frequency channel from the plurality of radio frequency channels of the remote unit, and to send the transmission signal to the target cell through the target radio frequency channel.

In one embodiment, the second routing indication includes an antenna identifier corresponding to the target cell; the second routing indication is used for indicating the remote unit to determine a target radio frequency channel based on the antenna identification and the corresponding relation between the preset radio frequency channel and the antenna identification.

In one embodiment, the second route indicates the number of antenna ports including the antenna port corresponding to the target cell in the target remote unit; the second routing indication is specifically configured to instruct the target remote unit to select, based on the number of antenna ports, a target radio frequency channel that matches the number of antenna ports from among the plurality of radio frequency channels of the target remote unit.

An extension unit is applied to a base station and comprises a routing module; the routing module is used for realizing the following steps:

and transmitting the transmission signal to the target cell.

A signal transmission method for a remote unit in a base station, the method comprising:

receiving a transmission signal of a target cell sent by a target extension unit in a base station; the transmission signal is sent to a target remote unit by a host unit in the base station through a target optical port; the transmission signal is transmitted to the target optical port through a transmission path between the physical layer channel and the target optical port; the target optical port is a target optical port which is selected by the host unit from a plurality of optical ports of the host unit to be in communication connection with the physical layer channel according to preset cell configuration parameters; different optical ports are in communication connection with different extension units;

and transmitting the transmission signal to the target cell.

acquiring a routing indication sent by a target expansion unit;

selecting at least one target radio frequency channel from the plurality of radio frequency channels of the remote unit according to the routing indication;

and transmitting the transmission signal to the target cell through the target radio frequency channel.

In one embodiment, the routing indication includes an antenna identifier corresponding to the target cell; selecting at least one target radio frequency channel among a plurality of radio frequency channels in a remote unit, comprising:

and determining a target radio frequency channel based on the antenna identification and the corresponding relation between the preset radio frequency channel and the antenna identification.

In one embodiment, the routing indication includes the number of antenna ports corresponding to the target cell in the target remote unit; selecting at least one target radio frequency channel among a plurality of radio frequency channels in a remote unit, comprising:

based on the number of antenna ports, at least one target radio frequency channel matching the number of antenna ports is selected among the plurality of radio frequency channels of the target remote unit.

A remote unit, the remote unit comprising a routing module, a plurality of radio frequency channels, and an antenna module connected to the radio frequency channels; the radio frequency channel is connected with the routing module; the routing module is used for realizing the following steps:

the transmission signal is sent to the target cell.

A base station system, comprising: a host unit, a plurality of expansion units and a plurality of remote units; the host unit is in communication connection with a plurality of extension units, each extension unit in the plurality of extension units is in communication connection with at least one remote unit, and the plurality of remote units are used for being in communication connection with the user equipment so that the user equipment can be accessed to the base station system;

the host unit is used for acquiring a transmission signal to be sent to a target cell through a physical layer channel of the host unit; selecting a target optical port in communication connection with the physical layer channel from a plurality of optical ports of the host unit according to preset cell configuration parameters; different optical ports are in communication connection with different extension units; transmitting the transmission signal to a target expansion unit corresponding to the target optical port through the target optical port, so as to transmit the transmission signal to the target expansion unit through the target expansion unit;

the extension unit is used for receiving a transmission signal of a target cell sent by the host unit through the target optical port; transmitting the transmission signal to the remote unit;

the remote unit is used for receiving a transmission signal of a target cell sent by a target extension unit in the base station; and transmits the transmission signal to the target cell.

A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the signal transmission method.

According to the signal transmission method, the signal transmission equipment, the signal transmission system and the signal transmission storage medium, the host unit acquires a transmission signal to be sent to a target cell through a physical layer channel; then, according to preset cell configuration parameters, selecting a target optical port in communication connection with the physical layer channel from a plurality of optical ports of the host unit; transmitting the transmission signal to a target expansion unit corresponding to the target optical port through the target optical port so as to send the transmission signal to a target cell through the target expansion unit; wherein, different optical ports are in communication connection with different extension units. The host unit selects a target optical port in communication connection with the physical layer channel from the plurality of optical ports according to the cell configuration parameters, so that transmission signals in the same physical layer channel can be sent to one or more target expansion units through different optical ports, and the transmission signals can be sent to a target cell through antenna ports under different expansion units; when the cells in the 5G system are configured with different numbers of antennas, the host unit may flexibly adjust the antenna ports corresponding to the transmission signals of the target cell by the method, so as to meet the technical requirements of multiple antennas in the 5G system.

Drawings

FIG. 1 is a diagram of an exemplary embodiment of a signal transmission method;

FIG. 2 is a flow chart illustrating a signal transmission method according to an embodiment;

FIG. 3 is a schematic diagram of a host unit in one embodiment;

FIG. 4 is a schematic diagram of a host unit in one embodiment;

FIG. 5 is a schematic diagram of a host unit in one embodiment;

FIG. 6 is a flow chart illustrating a method of signal transmission according to one embodiment;

FIG. 7 is a flow chart illustrating a method of signal transmission according to one embodiment;

FIG. 8 is a schematic diagram of an expansion unit in one embodiment;

FIG. 9 is a flow chart illustrating a method of signal transmission according to one embodiment;

FIG. 10 is a flow chart illustrating a method of signal transmission according to one embodiment;

FIG. 11 is a schematic diagram of a remote unit in one embodiment;

FIG. 12 is a diagram of a base station system in one embodiment;

fig. 13 is a schematic diagram of a base station system in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application 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 present application and are not intended to limit the present application.

The signal transmission method provided by the present application may be applied to a base station system as shown in fig. 1, where the base station system may include: a plurality of network elements such as a host unit, a plurality of extension units, a plurality of remote units, etc., the base station system can implement the connection between the network elements based on the topology shown in fig. 1; the host unit is communicatively coupled to a plurality of expansion units, each of which is communicatively coupled to at least one remote unit. Wherein, a plurality of extension units can be in parallel relation. The host unit mainly completes the modulation and demodulation of baseband signals, the expansion unit mainly completes the forwarding and convergence of uplink/downlink signals, and the remote unit mainly completes the radio frequency receiving/radio frequency sending of the uplink/downlink signals; generally, the host is in communication connection with the core network, and the remote unit is in communication connection with the user equipment, so the base station system can implement communication between the host unit and the user equipment, communication between the core network and the user equipment, communication between the user equipment and the user equipment, and the like. The user equipment can be but not limited to smart phones, computer equipment, portable wearable equipment, internet of things equipment, vehicles, unmanned aerial vehicles, industrial equipment and other equipment with radio frequency receiving/sending functions.

In one embodiment, as shown in fig. 2, a signal transmission method is provided, which is described by taking the method as an example applied to the host unit in fig. 1, and includes:

s101, a transmission signal to be sent to a target cell is obtained through a physical layer channel of a host unit.

The host unit is a unit that completes modulation and demodulation of a baseband signal in the base station device, and may include a plurality of physical layer channels. The physical layer channels may be physical layer channels of the same system, or physical layer channels of different systems. For example, the host unit may include a physical layer channel in a 5G system and a physical layer channel in a Long Term Evolution (Long Term Evolution, LTE for short) system. The physical layer channel may include a receiving channel, a transmitting channel, and a transceiving channel (which may process a transmitting signal and a receiving signal), and the type of the physical layer channel is not limited herein.

The host unit may include cell configuration parameters, so that the host unit may correspond each physical layer channel to each cell according to the cell configuration parameters. The number of physical layer channels corresponding to each cell may also be determined by a cell configuration parameter, for example, a cell carrier configured in the cell configuration parameter may be 4T4R, which indicates that the cell corresponds to 4 transmission channels and 4 reception channels; in addition, the cell carrier may also be 2T2R or 1T2R, and the number of physical layer channels corresponding to each cell is not limited herein.

The transmission signal may be IQ data output by a physical layer channel, and the host device may obtain a transmission signal of a target cell output by the physical layer channel according to a cell configuration parameter. After the host unit obtains the transmission signal, a target cell corresponding to the transmission signal may be determined according to a correspondence between a physical layer channel in the cell configuration parameter and the cell. The transmission signal may be IQ data output by a part of physical layer channels in the host unit, or IQ data output by all physical layer channels in the host unit, which is not limited herein.

In addition, the host unit may further include a User Equipment (UE) location management subsystem, a User uplink selection subsystem, a Common Radio interface subsystem (eCPRI interface subsystem), an Operation and Maintenance (OAM) system, a scheduler subsystem, and a plurality of modules such as a Radio Access Network (RAN) subsystem defined by a third Generation Partnership Project (3 GPP), which is not limited herein with respect to the structure of the host unit.

S102, selecting a target optical port in communication connection with a physical layer channel from a plurality of optical ports of a host unit according to preset cell configuration parameters; wherein, different optical ports are in communication connection with different extension units.

The cell configuration parameters are used for the host unit to determine a forwarding unit corresponding to the cell. The host unit may determine the target extension unit corresponding to the target cell according to the cell configuration parameter, and may also determine the target extension unit and the target remote unit corresponding to the target cell according to the cell configuration parameter, thereby sending the transmission signal to the target extension unit. The transmission signal may correspond to one target expansion unit or a plurality of target expansion units.

The host unit may include a plurality of optical ports, and different optical ports are communicatively connected to different expansion units. The host unit obtains a transmission signal of a target cell, determines which expansion units to send the transmission signal to according to configuration parameters of the cell, and then can use an optical port connected with the target expansion unit as a target optical port, enable communication connection between a physical layer channel and the target optical port, and send the transmission signal to the target optical port.

Specifically, the host unit may control a conduction state between the physical layer channel and each optical port, and after the optical port is determined as the target optical port, the host unit may connect and conduct with the target optical port by controlling the physical layer channel. In one implementation, the host unit may include a routing module, an input end of the routing module may be connected to each physical layer channel, an output end of the routing module may be connected to each optical port, and after the host unit determines a target optical port corresponding to a transmission signal, the host unit may route the transmission signal to the target optical port by controlling the routing module. Specifically, the host unit may determine, according to the target optical port, a transmission path through which the physical layer channel is routed to the target optical port; and transmitting the transmission signal to the target optical port through the transmission path, so that the target optical port transmits the target transmission signal to the target expansion unit. The host unit may correspond to the target optical port according to the AXC number of the transmission signal, so that the transmission signal may be transmitted through the target optical port. The AXC number is a data stream number in optical transmission.

And S103, transmitting the transmission signal to a target expansion unit corresponding to the target optical port through the target optical port so as to send the transmission signal to the target cell through the target expansion unit.

Further, the host unit may transmit the transmission signal to a target expansion unit connected to the target optical port through the target optical port. The host unit may send the transmission signal to the target cell through one target extension unit, or send the transmission signal to the target cell through a plurality of target extension units, which is not limited herein.

In order to smoothly transmit the transmission signal to the target expansion unit, before the host unit sends the transmission signal to the target optical port, the host unit may further perform route adaptation processing on the transmission signal according to transmission configuration of the target expansion unit, where the transmission configuration includes a transmission bit width and a sampling rate of the target expansion unit. For example, the host unit may adjust the transmission bit width of the transmission signal, as well as adjust the sampling rate of the transmission signal.

In the signal transmission method, the host unit acquires a transmission signal to be sent to a target cell through a physical layer channel; then, according to preset cell configuration parameters, selecting a target optical port in communication connection with the physical layer channel from a plurality of optical ports of the host unit; transmitting the transmission signal to a target expansion unit corresponding to the target optical port through the target optical port so as to send the transmission signal to a target cell through the target expansion unit; wherein, different optical ports are in communication connection with different extension units. The host unit selects a target optical port in communication connection with the physical layer channel from the plurality of optical ports according to the cell configuration parameters, so that transmission signals in the same physical layer channel can be sent to one or more target expansion units through different optical ports, and the transmission signals can be sent to a target cell through antenna ports under different expansion units; when the cells in the 5G system are configured with different numbers of antennas, the host unit may flexibly adjust the antenna ports corresponding to the transmission signals of the target cell by the method, so as to meet the technical requirements of multiple antennas in the 5G system.

In one embodiment, the host unit is configured to select a target optical port from a plurality of optical ports, and when the cell configuration parameters are different in parameter type, the host unit is configured to select the target optical port differently. In one implementation, the cell configuration parameter may include an identifier of a target extension unit corresponding to the target cell, and the host unit may determine, according to the identifier of the target extension unit, an optical port connected to the target extension unit as the target optical port.

In another implementation, the cell configuration parameter includes the number of remote units corresponding to the target cell and/or the number of antenna ports corresponding to the target cell, and the host unit may select the target optical port according to the cell configuration parameter.

The cell configuration parameters include the number of remote units corresponding to the target cell, and the host unit can acquire the number of remote units connected to each extension unit connected to the host unit; then, according to the number of remote units connected with each extension unit, selecting at least one target extension unit matched with the cell configuration parameters from the plurality of extension units; and determining the optical port of at least one target expansion unit as a target optical port. For example, 8 remote units are configured for the target cell in the cell configuration parameters, the host unit can know that the extension unit 1 and the extension unit 2 are both connected to 4 remote units in the connected multiple extension units, and the host unit can determine the extension unit 1 and the extension unit 2 as target remote units and determine the optical port 1 and the optical port 2 connected to the extension unit 1 and the extension unit 2 as target optical ports.

The cell configuration parameters include the number of antenna ports corresponding to the target cell, and the host unit can acquire the number of antenna ports of the remote unit connected to each expansion unit connected to the host unit; selecting at least one target expansion unit matched with the cell configuration parameters from the plurality of expansion units according to the number of antenna ports of the remote unit connected with each expansion unit; and determining the optical port of at least one target expansion unit as a target optical port. For example, 16 antenna ports are configured for the target cell in the cell configuration parameters, the host unit can know that the expansion unit 1 is connected with 2 remote units and each remote unit is connected with 4 antenna ports in a plurality of connected expansion units, the expansion units 2 are connected with 2 remote units and each remote unit is connected with 8 antenna ports, and the host unit can use the expansion unit 2 as a target expansion unit and use the optical port 2 connected with the expansion unit 2 as a target optical port; alternatively, the host unit may use both the extension unit 1 and the extension unit 2 as target extension units, and determine the

optical ports

1 and 2 to which the extension unit 1 and the extension unit 2 are connected as target optical ports.

The cell configuration parameters comprise the number of remote units corresponding to the target cell and the number of antenna ports corresponding to the target cell, and the host unit can acquire the first number of the remote units connected with each expansion unit and the second number of the antenna ports of each remote unit; selecting at least one target expansion unit matched with the cell configuration parameters from the plurality of expansion units according to the first quantity and the second quantity corresponding to each expansion unit; and determining the optical port of at least one target expansion unit as a target optical port. For example, 16 antenna ports are configured for the target cell in the cell configuration parameters, and 2 remote units are configured for the target cell, the host unit can know that the extension unit 1 and the extension unit 2 are both connected to 2 remote units and each remote unit is connected to 4 antenna ports in a plurality of connected extension units, and can use both the extension unit 1 and the extension unit 2 as target extension units and determine the optical port 1 and the optical port 2 connected to the extension unit 1 and the extension unit 2 as target optical ports.

According to the signal transmission method, the host unit selects the appropriate target expansion unit according to the cell configuration parameters, and transmits the transmission signals to each target expansion unit through the target optical port connected with the target expansion unit, so that after the working personnel configure different cell configuration parameters in the host unit, the host unit can flexibly transmit the transmission signals to the target cell through selecting the target expansion unit, and therefore the cell can be configured more flexibly.

In an embodiment, on the basis of the foregoing embodiment, when the host unit sends the transmission signal to the target expansion unit, the host unit may further send a routing instruction to the target expansion unit through the target optical port, so that the target expansion unit may select at least one target remote unit from the plurality of remote units connected to the target expansion unit according to the routing instruction, and send the transmission signal to the target cell through the target remote unit.

The routing indication may indicate to select the target remote unit through different types of parameters, and the target extension unit may select the target remote unit in a manner corresponding to the parameters after receiving the routing indication. In one implementation, the routing indication includes an identifier of the target remote unit, and the identifier of the target remote unit is used to instruct the target expansion unit to send the transmission signal to the target remote unit matching the identifier. In another implementation, the routing indication may include the number of target remote units and/or the number of antenna ports corresponding to the target cell; the route indication is used to instruct the target expansion unit to select at least one target remote unit matching the route indication and to send the transmission signal to the target remote unit.

The target extension unit may determine, after receiving the routing indication, which target remote units to send the transmission signal to according to the indication, and establish a connection between the optical port that receives the transmission signal and the optical port of the target remote unit, so that the target remote unit may receive the transmission signal and send the transmission signal to the target cell.

In the signal transmission method, the host unit sends the routing indication to the target expansion unit, so that the target expansion unit can select the target remote unit from the plurality of connected remote units according to the routing indication and send the transmission signal to the target remote unit, but does not send the transmission signal to all the remote units connected with the target expansion unit, so that the host unit can flexibly adjust the cell capacity and the cell coverage; in addition, the host unit can flexibly adjust configuration parameters such as cell capacity, coverage and the like in the base station without indication based on the core network, thereby reducing signaling interaction between the base station and the core network and reducing the burden of the core network.

In one embodiment, on the basis of the above embodiments, the physical layer channel of the host unit may include physical layer channels of multiple formats; accordingly, the transmission signal may include a transmission data stream output by a physical layer channel of at least one standard.

The physical layer channel may include a first physical layer channel disposed in the host unit and/or a second physical layer channel connected to the host unit through an optical port. The first physical layer channel and the second physical layer channel may have the same or different standards. As shown in fig. 3, the host unit includes multiple physical layer channels of a 5G system, and multiple physical layer channels of an LTE system and multiple physical layer channels of a GSM system are accessed through an optical interface, and the multiple physical layer channels may be connected to an input port of a routing module in the host unit. Fig. 4 shows another host unit, where the host unit includes multiple physical layer channels of a 5G system, multiple physical layer channels of an LTE system, and multiple physical layer channels of a GSM system.

The host unit can flexibly switch physical layer channels of multiple systems to different extension units, for example, the physical layer channel indicated by LTE can be sent to an LTE cell through the extension unit 1 and multiple remote units connected to the extension unit 1, after frequency re-cultivation, the frequency corresponding to the remote unit can be applied to a 5G system, and the host unit can connect the physical layer channel of the 5G system with an optical port corresponding to the extension unit 1, so that transmission signals of the 5G system can be sent to the 5G cell through the extension unit 1 and the multiple remote units connected to the extension unit 1.

According to the signal transmission method, the host unit comprises the physical layer channels of multiple systems, multi-system fusion can be achieved, transmission signals of the physical layer channels of multiple indications can share the same set of extension unit and remote unit, and deployment cost of deploying the multi-system base station is reduced; in addition, the channel data of the physical layer of the multi-system can be flexibly switched to different extension units, so that the transmission channel switching of the transmission data can be conveniently realized by switching the extension units after the frequency between the multi-system is repeatedly ploughed, and the multi-system communication system is more flexible in the formula evolution.

In one embodiment, a host unit is provided, as shown in fig. 5, the host unit is applied in a base station, and includes at least one physical layer channel, a routing module, and a plurality of optical ports connected to the routing module; different optical ports are in communication connection with different extension units;

the physical layer channel is used for acquiring a transmission signal to be sent to a target cell; the routing module is configured to select a target optical port in communication connection with the physical layer channel from among the multiple optical ports of the host unit according to a preset cell configuration parameter, and transmit a transmission signal to a target expansion unit corresponding to the target optical port through the target optical port.

In another embodiment, the routing module is further configured to determine, according to the target optical port, a transmission path from the physical layer channel to the target optical port; and transmitting the transmission signal to the target optical port through the transmission path so that the target optical port transmits the target transmission signal to the target expansion unit.

In another embodiment, the routing module is further configured to perform routing adaptation processing on the transmission signal according to the transmission configuration of the target extension unit; the transmission configuration includes the transmission bit width and the sampling rate of the target expansion unit.

In another embodiment, the routing module is further configured to determine, according to an identifier of a target extension unit corresponding to a target cell included in the cell configuration parameter, an optical port connected to the target extension unit as a target optical port.

In another embodiment, the cell configuration parameter includes the number of remote units corresponding to the target cell, and the routing module is further configured to obtain the number of remote units connected to each extension unit; selecting at least one target expansion unit matched with the cell configuration parameters from the plurality of expansion units according to the number of the remote units connected with each expansion unit; and determining the optical port of at least one target expansion unit as a target optical port.

In another embodiment, the cell configuration parameter includes the number of antenna ports corresponding to the target cell, and the routing module is further configured to obtain the number of antenna ports of the remote unit connected to each extension unit; selecting at least one target expansion unit matched with the cell configuration parameters from the plurality of expansion units according to the number of antenna ports of the remote unit connected with each expansion unit; and determining the optical port of at least one target expansion unit as a target optical port.

In another embodiment, the cell configuration parameters include the number of remote units corresponding to the target cell and the number of antenna ports corresponding to the target cell, and the routing module is further configured to obtain a first number of remote units connected to each expansion unit and a second number of antenna ports of each remote unit; selecting at least one target expansion unit matched with the cell configuration parameters from the plurality of expansion units according to the first quantity and the second quantity corresponding to each expansion unit; and determining the optical port of at least one target expansion unit as a target optical port.

In another embodiment, the routing module is further configured to send a routing indication to the target expansion unit through the target optical port; the route indication is used to indicate the target extension unit, select at least one target remote unit among a plurality of remote units connected to the target extension unit, and transmit the transmission signal to the target cell through the target remote unit.

The implementation principle and technical effect of the host unit are similar to those of the signal transmission method, and are not described herein again.

In one embodiment, as shown in fig. 6, a signal transmission method is provided, which is described by taking an example of the method applied to the extension unit in fig. 1, and includes:

s201, receiving a transmission signal of a target cell sent by a host unit through a target optical port; the transmission signal is transmitted to the target optical port through a transmission path between the physical layer channel and the target optical port; the target optical port is a target optical port which is selected by the host unit from a plurality of optical ports of the host unit to be in communication connection with the physical layer channel according to preset cell configuration parameters; different optical ports are in communication connection with different extension units.

S202, the transmission signal is sent to the target cell.

The implementation principle and technical effect of the signal transmission method are similar to those of the embodiment corresponding to fig. 2, and are not described herein again.

Fig. 7 is a flowchart illustrating a signal transmission method in another embodiment, where this embodiment relates to an implementation manner in which an extension unit sends a transmission signal to a target cell, and on the basis of the foregoing embodiment, as shown in fig. 7, the foregoing S102 includes:

s301, a first routing instruction sent by the host unit is obtained.

The first routing indication is indication information sent from the host unit to the target expansion unit, and is used for indicating to the target expansion unit which remote units to send the transmission signals to, and establishing connection between the optical port for receiving the transmission signals and the optical port of the target remote unit, so that the target remote unit can receive the transmission signals and send the transmission signals to the target cell. The first routing instruction may include the number of the target remote units corresponding to the target cell, or may also include the number of the antenna ports corresponding to the target cell in the extension unit, and the content of the first routing instruction is not limited herein.

S302, selecting at least one target remote unit from the plurality of remote units connected to the extension unit according to the first routing indication.

After the extension unit receives the first routing indication, at least one target remote unit may be selected among the plurality of remote units connected to the extension unit according to the first routing indication.

Specifically, the extension unit may control a conduction state between the extension unit and each remote unit, and after the remote unit is determined as the target remote unit, the extension unit may control a connection conduction between the extension unit and the target remote unit. In one implementation, the extension unit may include a routing module, an input of the routing module may be connected to the host unit, an output of the routing module may be connected to each remote unit, and after the extension unit determines the target remote unit, the routing module may be controlled to route the transmission signal to the target remote unit.

In order to smoothly transmit the transmission signal to the target remote unit, before the host unit sends the transmission signal to the target remote unit, the host unit may further perform route adaptation processing on the transmission signal according to transmission configuration of the target remote unit, where the transmission configuration includes a transmission bit width and a sampling rate of the target remote unit. For example, the extension unit may further include a plurality of IQ processing channels, and the extension unit may adjust transmission bit widths of the transmission signals and adjust sampling rates of the transmission signals through different IQ processing channels, so that the adjusted transmission signals may be respectively adapted to the respective target remote units.

In one implementation, the first routing indication includes an identification of the target remote unit; the extension unit may determine the remote unit corresponding to the identifier as the target remote unit of the target cell.

In another implementation, the first routing indication may include the number of target remote units, and/or the number of antenna ports corresponding to the target cell. If the first routing indication comprises the number of target remote units, the extension unit may select at least one target remote unit from the plurality of remote units that matches the number of target remote units, based on the number of target remote units. If the first routing indication includes the number of antenna ports corresponding to the target cell, the expansion unit may obtain the number of antenna ports of each remote unit connected to the expansion unit, respectively; and then selecting at least one target remote unit which is matched with the number of the antenna ports corresponding to the target cell from the plurality of remote units according to the number of the antenna ports of each remote unit. If the first routing indication may include the number of the target remote units and/or the number of the antenna ports corresponding to the target cell, then at least one target remote unit matching the number of the antenna ports corresponding to the target cell and the number of the remote units is selected from the plurality of remote units according to the number of the antenna ports of the plurality of remote units connected by the extension unit and in combination with the number of the target remote units. For example, the first routing instruction instructs the extension unit to send the received transmission signal to 4 target remote units, the extension unit may select 4 target remote units from the connected remote units, and the extension unit may select four target remote units according to a matching relationship between the target remote units and a system corresponding to the transmission signal; the selection may also be based on the operating status of a plurality of remote units, e.g. if one of the selected 4 target remote units fails, the extension unit may reselect one target remote unit.

S303, sending the transmission signal to the target cell through at least one target remote unit.

Further, the extension unit may send the transmission signal to at least one target remote unit, such that the target remote unit may send the transmission signal to the target cell.

Further, the extension unit may also send a second routing indication to the target remote unit. The second routing indication is used for instructing the target remote unit to select at least one target radio frequency channel from the plurality of radio frequency channels of the remote unit, and transmitting the transmission signal to the target cell through the target radio frequency channel.

The second routing indication may include an antenna identifier corresponding to the target cell; the second routing indication may be used to instruct the remote unit to determine the target radio frequency channel based on the antenna identifier and a preset correspondence between the radio frequency channel and the antenna identifier. In the above correspondence relationship, one antenna port may correspond to one radio frequency channel, and may also correspond to a plurality of radio frequency channels, which is not limited herein. The second routing indication may also include the number of antenna ports of the antenna port corresponding to the target cell in the target remote unit; the second routing indication may be for instructing the target remote unit to select a target radio frequency channel, among the plurality of radio frequency channels of the target remote unit, that matches the number of antenna ports based on the number of antenna ports. For example, the second routing indication indicates that the target remote unit sends the transmission signal to 4 antenna ports, and the target remote unit may select, from among the plurality of radio frequency channels, a radio frequency channel connected to the 4 antenna ports as the target radio frequency channel.

In the signal transmission method, the extension unit can select the target remote unit from the plurality of connected remote units according to the route indication by receiving the first route indication, and send the transmission signal to the target remote unit instead of sending the transmission signal to all the remote units connected with the target extension unit, so that the cell capacity and the cell coverage can be flexibly adjusted; further, the extension unit sends the second routing instruction to the target remote unit, so that the target remote unit can select the target radio frequency channel from the plurality of radio frequency channels according to the second routing instruction, and does not completely send the transmission signal to all the radio frequency channels in the target remote unit, so that the extension unit can flexibly adjust the cell capacity and the cell coverage, and the transmission flexibility of the transmission signal is further improved.

In one embodiment, an extension unit is provided, as shown in fig. 8, the extension unit includes a routing module; the routing module is configured to implement the steps of the signal transmission method in the embodiment corresponding to fig. 6 or fig. 7, and the implementation principle and the technical effect are similar to those of the above embodiment, and are not described herein again.

In another embodiment, the extension unit further includes a plurality of IQ processing channels, and the IQ processing channels can be configured to adjust a transmission bit width of the transmission signal and adjust a sampling rate of the transmission signal, so that the adjusted transmission signal can be adapted to each of the target remote units.

In one embodiment, as shown in fig. 9, a signal transmission method is provided, which is described by taking the remote unit in fig. 1 as an example, and includes:

s401, receiving a transmission signal of a target cell sent by a target extension unit in a base station; the transmission signal is sent to a target remote unit by a host unit in the base station through a target optical port; the transmission signal is transmitted to the target optical port through a transmission path between the physical layer channel and the target optical port; the target optical port is a target optical port which is selected by the host unit from a plurality of optical ports of the host unit to be in communication connection with the physical layer channel according to preset cell configuration parameters; different optical ports are in communication connection with different extension units;

s402, the transmission signal is sent to the target cell.

The implementation principle and technical effect of the signal transmission method are similar to those of the embodiments corresponding to fig. 2 and fig. 6, and are not described herein again.

Fig. 10 is a schematic flowchart of a signal transmission method in another embodiment, where this embodiment relates to an implementation manner of sending a transmission signal to a target cell by a remote unit, and on the basis of the foregoing embodiment, as shown in fig. 10, the foregoing S402 includes:

s501, obtaining a routing instruction sent by the target extension unit.

The routing indication is the same as the second routing indication in the embodiment corresponding to fig. 7, and is not described herein again.

S502, according to the route indication, at least one target radio frequency channel is selected from the plurality of radio frequency channels of the remote unit.

Further, the remote unit may select at least one target rf channel among the plurality of rf channels according to the routing indication. Specifically, the routing indication may include an antenna identifier corresponding to the target cell; the target remote unit may determine the target rf channel based on the antenna identifier and a preset correspondence between the rf channel and the antenna identifier. In the above correspondence relationship, one antenna port may correspond to one radio frequency channel, and may also correspond to a plurality of radio frequency channels, which is not limited herein.

In another implementation, the routing indication may include the number of antenna ports of the target cell corresponding to the target remote unit; the target remote unit may select at least one target radio frequency channel matching the number of antenna ports among the plurality of radio frequency channels of the target remote unit based on the number of antenna ports.

And S503, transmitting the transmission signal to the target cell through the target radio frequency channel.

Based on the above steps, the target remote unit may send the transmission signal to the target cell through the target radio frequency channel.

According to the signal transmission method, the target remote unit can select the target radio frequency channel from the plurality of radio frequency channels according to the routing indication by acquiring the routing indication, and the transmission signal is not completely sent to all the radio frequency channels in the target remote unit, so that the cell capacity and the cell coverage area can be flexibly adjusted, and the transmission flexibility of the transmission signal is further improved.

In one embodiment, a remote unit is provided, as shown in fig. 11, the remote unit includes a routing module, a plurality of rf channels, and an antenna module connected to the rf channels; the radio frequency channel is connected with the routing module; the routing module is configured to implement the steps of the signal transmission method in the embodiment corresponding to fig. 9 or fig. 10, and the implementation principle and technical effect of the routing module are similar to those of the embodiment, which are not described herein again.

It should be understood that although the various steps in the flow charts in fig. 2-11 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-11 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps.

It will be understood by those skilled in the art that the structures of the host unit, the expansion unit and the remote unit in the above embodiments are only block diagrams of partial structures related to the present application, and do not constitute limitations on the devices to which the present application applies, and a specific device may include more or less components than those shown in the drawings, or may combine some components, or have different arrangements of components.

In one embodiment, there is provided a base station system, as shown in fig. 12, including: a host unit, a plurality of expansion units and a plurality of remote units; the host unit is in communication connection with a plurality of extension units, each extension unit in the plurality of extension units is in communication connection with at least one remote unit, and the plurality of remote units are used for being in communication connection with the user equipment so that the user equipment can be accessed to the base station system;

The host unit is further configured to implement the steps of the signal transmission method applied to the host unit in the above embodiment, the extension unit is further configured to implement the steps of the signal transmission method applied to the extension unit in the above embodiment, and the remote unit is further configured to implement the steps of the signal transmission method applied to the remote unit in the above embodiment.

The implementation principle and technical effect of the base station system provided in this embodiment are similar to those of the above method embodiments, and are not described herein again.

In one embodiment, a base station system is provided, which includes a host unit, a plurality of extension units, and a plurality of remote units. The host unit is connected to a physical layer channel ANT _ L indicated by LTE and a physical layer channel ANT _ G of a GSM system through an optical interface, and the host unit further comprises a plurality of physical layer channels ANT-N of a 5G system. The host unit comprises a first routing module, the expansion unit comprises a plurality of IQ processing channels and a second routing module, and the remote unit comprises a third routing module, a plurality of radio frequency channels and a plurality of antenna ports.

As shown in fig. 13, the CELL configuration parameters in the host unit configure 4 CELLs in total, including 1T2R CELL _ G in GSM system, 2T2R CELL _ L in LTE system, and 2T2R CELL _ N1 and 4T4R CELL _ N2 in 5G system. The host unit optical port 1 hangs down the extension unit SW1-1, can configure the remote unit that the extension unit 1-1 hangs down into CELL _ N2, CELL _ G and CELL _ L; remote units hanging down the extension units SW1-M are configured into CELL _ N1, CELL _ G, and CELL _ L. In addition, the host unit optical port 2 hangs down the extension unit SW2-1, and the remote unit hung down by the extension unit 2-1 can be configured into CELL _ N2; remote units hanging down extension units SW2-M are configured into CELL _ N1 and CELL _ L. A remote unit hung under an extension unit SWN-1 hung under an optical port N of a host unit is configured into CELL _ N2 and CELL _ L; the remote units hanging down the extension unit SWN-M are configured into CELL _ N1 and CELL _ L.

For example, the host unit may send the transmission signal of the CELL _ N2 to the target expansion unit SW1-1 through the optical port 1, and send the transmission signal to the target remote unit RU1-1-1 through the target expansion unit SW1-1, and the target remote unit RU1-1-1 may select the radio frequency channel corresponding to the antenna port 1-4 as the target radio frequency channel, and send the transmission signal to the target radio frequency channel.

The implementation principle and technical effect of the base station system are similar to those of the embodiments, and are not described herein again.

In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, realizes the steps in the above-mentioned signal transmission method.

The computer storage medium provided in this embodiment has similar implementation principles and technical effects to those of the above method embodiments, and is not described herein again.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.

Claims

1. A signal transmission method applied to a host unit in a base station device, the method comprising:

selecting a target optical port in communication connection with the physical layer channel from a plurality of optical ports of the host unit according to preset cell configuration parameters; different optical ports are in communication connection with different extension units;

performing route adaptation processing on the transmission signal according to the transmission configuration of a target expansion unit corresponding to the target optical port to obtain a transmission signal after the route adaptation processing; wherein the transmission configuration comprises a transmission bit width and a sampling rate of the target expansion unit;

and transmitting the transmission signal after the route adaptation processing to a target expansion unit corresponding to the target optical port through the target optical port, so as to send the transmission signal to the target cell through the target expansion unit.

2. The signal transmission method according to claim 1, wherein the transmitting the transmission signal to the target expansion unit corresponding to the target optical port through the target optical port includes:

determining a transmission path from the physical layer channel to the target optical port according to the target optical port;

and sending the transmission signal to the target optical port through the transmission path so that the target optical port sends a target transmission signal to the target expansion unit.

3. The signal transmission method according to claim 2, wherein before the transmitting the transmission signal to the target optical port via the transmission path, the method further comprises:

carrying out route adaptation processing on the transmission signal according to the transmission configuration of the target extension unit; the transmission configuration includes a transmission bit width and a sampling rate of the target expansion unit.

4. The signal transmission method according to any one of claims 1 to 3, wherein the cell configuration parameter includes an identifier of a target extension unit corresponding to the target cell, and the selecting a target optical port in communication connection with the physical layer channel from among the plurality of optical ports of the host unit includes:

and determining the optical port connected with the target expansion unit as the target optical port according to the identifier of the target expansion unit.

5. The signal transmission method according to claim 1, wherein the cell configuration parameter includes a number of remote units corresponding to the target cell, and the selecting a target optical port in communication connection with the physical layer channel from among the plurality of optical ports of the host unit includes:

selecting at least one target expansion unit matched with the cell configuration parameters from a plurality of expansion units according to the number of remote units connected with each expansion unit;

determining the optical port of the at least one target expansion unit as the target optical port.

6. The signal transmission method according to claim 1, wherein the cell configuration parameter includes a number of antenna ports corresponding to the target cell, and the selecting a target optical port in communication connection with the physical layer channel from among a plurality of optical ports of the host unit includes:

selecting at least one target expansion unit matched with the cell configuration parameters from a plurality of expansion units according to the number of antenna ports of the remote unit connected with each expansion unit;

7. The signal transmission method according to claim 5 or 6, wherein the cell configuration parameters include a number of remote units corresponding to the target cell and a number of antenna ports corresponding to the target cell, and the selecting a target optical port in communication connection with the physical layer channel from among the plurality of optical ports of the host unit includes:

selecting at least one target expansion unit matched with the cell configuration parameters from a plurality of expansion units according to the first quantity and the second quantity corresponding to each expansion unit;

8. The signal transmission method according to any one of claims 1 to 3, characterized in that the method further comprises:

sending a routing indication to the target expansion unit through the target optical port; the routing indication is used to indicate the target extension unit, select at least one target remote unit from a plurality of remote units connected to the target extension unit, and send the transmission signal to the target cell through the target remote unit.

9. The signal transmission method according to claim 8, wherein the routing indication comprises an identification of the target remote unit, the identification of the target remote unit being used to instruct the target extension unit to send the transmission signal to the target remote unit matching the identification.

10. The signal transmission method according to claim 8, wherein the routing indication includes the number of the target remote units and/or the number of antenna ports corresponding to the target cell; the route indication is used for instructing the target expansion unit to select at least one target remote unit matched with the route indication and send the transmission signal to the target remote unit.

11. The signal transmission method according to any one of claims 1 to 3, wherein the physical layer channel includes physical layer channels of a plurality of standards; the transmission signal comprises a transmission data stream output by at least one standard physical layer channel.

12. The signal transmission method according to claim 11, wherein the physical layer channel comprises a first physical layer channel disposed in the host unit and/or a second physical layer channel accessed to the host unit through an optical port.

13. A host unit is applied in a base station and comprises at least one physical layer channel, a routing module and a plurality of optical ports connected with the routing module; different optical ports are in communication connection with different extension units;

the routing module is configured to select a target optical port in communication connection with the physical layer channel from among a plurality of optical ports of the host unit according to preset cell configuration parameters, and perform routing adaptation processing on the transmission signal according to transmission configuration of a target extension unit corresponding to the target optical port to obtain a transmission signal after the routing adaptation processing; wherein the transmission configuration comprises a transmission bit width and a sampling rate of the target expansion unit; and transmitting the transmission signal after the route adaptation processing to a target expansion unit corresponding to the target optical port through the target optical port.

14. Host unit according to claim 13, characterized in that the routing module is adapted to implement the steps of the signal transmission method according to any of claims 2-10.

15. A signal transmission method, applied to an extension unit in a base station, the method comprising:

receiving a transmission signal of a target cell sent by a host unit through a target optical port; the transmission signal is transmitted to the target optical port through a transmission path between a physical layer channel and the target optical port, and the transmission signal is subjected to route adaptation processing according to the transmission configuration of a target extension unit corresponding to the target optical port to obtain a transmission signal subjected to route adaptation processing; wherein the transmission configuration comprises a transmission bit width and a sampling rate of the target expansion unit; the target optical port is a target optical port which is selected by the host unit from a plurality of optical ports of the host unit to be in communication connection with the physical layer channel according to preset cell configuration parameters; different optical ports are in communication connection with different extension units;

and sending the transmission signal after the route adaptation processing to the target cell.

16. The signal transmission method of claim 15, wherein the sending the transmission signal to the target cell comprises:

acquiring a first routing indication sent by the host unit;

selecting at least one target remote unit among a plurality of remote units connected to the expansion unit in accordance with the first routing indication;

transmitting, by the at least one target remote unit, the transmission signal to the target cell.

17. The signal transmission method according to claim 16, wherein the first routing indication includes an identification of the target remote unit; said selecting at least one target remote unit among a plurality of remote units connected to the expansion unit comprises:

and determining the remote unit corresponding to the identifier as the target remote unit of the target cell.

18. The signal transmission method according to claim 16, wherein the first routing indication includes a number of target remote units and/or a number of antenna ports corresponding to the target cell.

19. The signal transmission method according to claim 18, wherein said selecting at least one target remote unit among a plurality of remote units connected to an expansion unit if said first routing indication includes a number of target remote units comprises:

selecting at least one target remote unit from the plurality of remote units that matches the number of target remote units based on the number of target remote units.

20. The signal transmission method according to claim 18, wherein if the first routing indication includes the number of antenna ports corresponding to the target cell, the selecting at least one target remote unit from a plurality of remote units connected to an extension unit comprises:

and selecting at least one target remote unit which is matched with the number of the antenna ports corresponding to the target cell from the plurality of remote units according to the number of the antenna ports of each remote unit.

21. The signal transmission method according to any of claims 16-20, wherein before transmitting the transmission signal to the target cell by the at least one target remote unit, further comprising:

transmitting a second routing indication to the target remote unit; the second routing indication is configured to instruct the target remote unit to select at least one target radio frequency channel from a plurality of radio frequency channels of the remote unit, and send the transmission signal to a target cell through the target radio frequency channel.

22. The signal transmission method of claim 21, wherein the second routing indication comprises an antenna identifier corresponding to the target cell; the second routing indication is used for indicating the remote unit to determine the target radio frequency channel based on the antenna identifier and a preset corresponding relation between the radio frequency channel and the antenna identifier.

23. The signal transmission method of claim 21, wherein the second routing indication comprises a number of antenna ports corresponding to the target cell in the target remote unit; the second routing indication is specifically configured to instruct the target remote unit to select, based on the number of the antenna ports, a target radio frequency channel that matches the number of the antenna ports from among the plurality of radio frequency channels of the target remote unit.

24. An extension unit, which is applied in a base station, and comprises a routing module; the routing module is configured to implement the steps of the signal transmission method according to any one of claims 15 to 23.

25. A signal transmission method for a remote unit in a base station, the method comprising:

receiving a transmission signal after route adaptation processing of a target cell sent by a target extension unit in a base station; the transmission signal after the route adaptation processing is transmitted to a target remote unit through a target optical port by a host unit in a base station; the transmission signal after the route adaptation processing is transmitted to the target optical port through a transmission path between a physical layer channel and the target optical port after the route adaptation processing is performed on the transmission signal according to the transmission configuration of a target extension unit corresponding to the target optical port; the target optical port is a target optical port which is selected by the host unit from a plurality of optical ports of the host unit to be in communication connection with the physical layer channel according to preset cell configuration parameters; different optical ports are in communication connection with different extension units;

26. The signal transmission method of claim 25, wherein the sending the transmission signal to the target cell comprises:

acquiring a routing indication sent by the target extension unit;

selecting at least one target radio frequency channel among a plurality of radio frequency channels of the remote unit according to the routing indication;

and sending the transmission signal to the target cell through the target radio frequency channel.

27. The signal transmission method of claim 26, wherein the routing indication comprises an antenna identifier corresponding to the target cell; said selecting at least one target radio frequency channel among a plurality of radio frequency channels of said remote unit comprises:

and determining the target radio frequency channel based on the antenna identification and the corresponding relation between the preset radio frequency channel and the antenna identification.

28. The signal transmission method of claim 26, wherein the routing indication comprises a corresponding number of antenna ports of the target cell in the target remote unit; said selecting at least one target radio frequency channel among a plurality of radio frequency channels of said remote unit comprises:

selecting at least one target radio frequency channel matching the number of antenna ports among the plurality of radio frequency channels of the target remote unit based on the number of antenna ports.

29. A remote unit, wherein the remote unit comprises a routing module, a plurality of radio frequency channels, and an antenna module connected to the radio frequency channels; the radio frequency channel is connected with the routing module;

the routing module is configured to implement the steps of the signal transmission method according to any one of the preceding claims 25 to 28.

30. A base station system, comprising: a host unit according to any one of claims 13 to 14, a plurality of expansion units according to claim 24 and a plurality of remote units according to claim 29; the host unit is in communication connection with the plurality of expansion units, each expansion unit in the plurality of expansion units is in communication connection with at least one remote unit, and the plurality of remote units are used for being in communication connection with user equipment so that the user equipment can be accessed to the base station system.

31. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the signal transmission method according to any one of claims 1 to 12, claims 15 to 23, claims 25 to 28.