CN110839278A - Indoor base station and positioning method - Google Patents
Indoor base station and positioning method Download PDFInfo
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- CN110839278A CN110839278A CN201810942477.XA CN201810942477A CN110839278A CN 110839278 A CN110839278 A CN 110839278A CN 201810942477 A CN201810942477 A CN 201810942477A CN 110839278 A CN110839278 A CN 110839278A
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- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
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Abstract
The invention provides an indoor base station and a positioning method, which belong to the technical field of wireless communication, and the indoor base station comprises: the device comprises a signal processing module, at least two antennas and a control module; the signal processing module is connected with each antenna through a corresponding connecting channel; at least one antenna of the at least two antennas is an external antenna connected with the signal processing module through a cable; the control module is connected with the connecting channels and used for controlling the connecting channels corresponding to the at least two antennas to be sequentially connected according to a time sequence in a time period when the terminal sends the uplink positioning information, so that the signal processing module sequentially obtains the radio-frequency signals which are received by the at least two antennas and contain the uplink positioning information; and the signal processing module is used for processing the acquired radio frequency signal containing the uplink positioning information to obtain a processed signal for positioning the terminal. The invention improves the indoor positioning precision of the terminal by adding the external antenna and has low cost.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to an indoor base station and a positioning method.
Background
A pico base station (also called pico RRU or pRRU) is a miniaturized, low-power, and low-power indoor coverage Radio frequency Unit (RRU), that is, an indoor base station, which performs substantially the same functions as a conventional RRU for macro coverage, and has functions of a receiver and a transmitter, that is, both convert a digital signal (first converted into an intermediate frequency signal) into a Radio frequency signal at a Remote end, and then amplify and transmit the Radio frequency signal; or the radio frequency signal received by the receiving antenna is converted into a digital signal and then transmitted to a baseband processing unit (BBU), so the Pico RRU also comprises functional modules such as an intermediate frequency module, a transceiver module, a power amplifier module, a filter module and the like, and the baseband function is also completed by the BBU.
However, Pico RRU also has some different characteristics of its own compared to macro-covered normal RRU: 1) as PicoRRU is used for indoor coverage, the transmission power is low, generally in the order of hundreds of milliwatts, and the volume is small, so as to beautify and hide; 2) for convenience of indoor deployment and construction, the Pico RRU generally adopts a three-level architecture, that is, a plurality of Pico base stations (Pico RRUs) 01 are connected to a dedicated centralized switching unit (HUB)02 through network cables, and then a plurality of HUBs are connected to a base band processing unit (BBU)04 through optical fibers 03, as shown in fig. 1. In addition, as the Pico RRU has a complete radio frequency unit processing capability, flexible cell merging and splitting can be performed among the plurality of Pico RRUs, for example, when the capacity requirement of a deployment area is large, the plurality of Pico RRUs can be split into a plurality of cells to increase the capacity. Therefore, Pico RRU is mostly used in large-capacity indoor coverage scenes such as malls, airport stations, stadiums, and the like.
After the Pico RRU is deployed in a large-capacity room, indoor positioning service can be provided based on the Pico RRU. The main principle of the positioning scheme is that a plurality of Pico RRUs can simultaneously receive uplink signals sent by the same terminal, then a BBU or a positioning server and the like can jointly perform signal processing based on the characteristics of the uplink signals, such as arrival angle, arrival time, receiving power and the like, and the indoor position of the terminal is calculated by adopting algorithms such as a fingerprint library or triangulation positioning and the like.
Generally, the accuracy of indoor positioning is higher when the Pico RRU deployment density is higher (i.e. the spacing between two adjacent Pico RRUs is smaller). For example, to achieve a positioning accuracy of 5m, the average deployment pitch of Pico RRUs needs to be around 20 m. However, the actual deployment distance of the Pico RRUs is usually about 40-50 m, which means that the Pico RRUs need to be deployed in an encrypted manner in order to meet the accuracy requirement (such as about 5 m) of indoor positioning.
However, for indoor location services, the deployment of the encrypted Pico RRU generally has the following problems:
1) the investment of the operator will increase significantly. This investment consists of two parts: one part is equipment investment, the number of Pico RRUs can multiply along with the deployment density, and the number of required hubs, the amount of network cables and optical fibers and the like can also increase in proportion; another part is the construction investment, since this is almost equivalent to re-constructing a new set of Pico RRU indoor coverage system.
2) The indoor coverage needs to be planned again, because the Pico RRU deployment is encrypted, if the Pico RRU deployment is split into different cells, the interference is obviously increased; if the cell combining is performed to avoid interference, if the cell combining is performed by baseband combining, the amount of baseband processing resources will be significantly increased, and reconfiguration is required, and if the cell combining is performed by radio frequency combining, the uplink background noise of the cell will be raised. In summary, network planning and network optimization need to be performed anew due to changes in the network structure.
Therefore, there is a need for another scheme for improving the indoor positioning accuracy, instead of the scheme deployed by the encryption Pico RRU, which has the above-mentioned problems.
Disclosure of Invention
In view of this, the present invention provides an indoor base station and a positioning method, which are used to solve the problems that the existing scheme for improving the indoor positioning accuracy is high in cost and needs to re-plan indoor coverage.
To solve the above technical problem, in a first aspect, the present invention provides an indoor base station, including:
the device comprises a signal processing module, at least two antennas and a control module;
the signal processing module is connected with each antenna through a corresponding connecting channel;
at least one antenna of the at least two antennas is an external antenna connected with the signal processing module through a cable;
the control module is connected with the connection channel and is used for controlling the connection channel between the at least two antennas and the signal processing module to be sequentially connected according to a time sequence in a time period when the terminal sends uplink positioning information, so that the signal processing module sequentially acquires radio frequency signals which are received by the at least two antennas and contain the uplink positioning information;
and the signal processing module is used for processing the acquired radio frequency signal containing the uplink positioning information to obtain a processed signal for positioning the terminal.
Preferably, the signal processing module includes:
the radio frequency channel unit is respectively connected with the at least two antennas through corresponding connecting channels and is used for acquiring radio frequency signals which are received by the at least two antennas and contain the uplink positioning information and converting the radio frequency signals into intermediate frequency signals;
and the digital intermediate frequency unit is connected with the radio frequency channel unit and used for receiving the intermediate frequency signal sent by the radio frequency channel unit and converting the intermediate frequency signal into a baseband signal.
Preferably, switches are respectively arranged on connecting channels between the at least two antennas and the radio frequency channel unit;
and the control module is respectively connected with the switches and used for controlling the connection channels between the at least two antennas and the radio frequency channel unit to be sequentially connected according to a time sequence by controlling the switches in a time period when the terminal sends uplink positioning information.
Preferably, the signal processing module includes:
each radio frequency channel unit is respectively connected with the at least two antennas and is used for acquiring radio frequency signals which are received by the at least two antennas and contain the uplink positioning information and converting the radio frequency signals into intermediate frequency signals;
and the digital intermediate frequency unit is respectively connected with the at least two radio frequency channel units and is used for receiving the intermediate frequency signals sent by the radio frequency channel units and converting the intermediate frequency signals into baseband signals.
Preferably, a switch is respectively arranged on a connecting channel between at least one radio frequency channel unit and the at least two antennas;
the control module is connected with the switches respectively and is used for controlling the connection channels between the at least two antennas and the at least one radio frequency channel unit to be sequentially connected according to a time sequence by controlling the switches in a time period when the terminal sends uplink positioning information.
Preferably, the signal processing module includes:
the four radio frequency channel units are respectively connected with one part of the antennas in the at least two antennas, the other two radio frequency channel units are respectively connected with the other parts of the antennas in the at least two antennas, and the radio frequency channel units are used for acquiring radio frequency signals which contain the uplink positioning information and are received by the connected parts of the antennas and converting the radio frequency signals into intermediate frequency signals;
and the digital intermediate frequency unit is respectively connected with the four radio frequency channel units and is used for receiving the intermediate frequency signals sent by the radio frequency channel units and converting the intermediate frequency signals into baseband signals.
Preferably, the radio frequency channel unit includes:
the system comprises a receiving channel, a transmitting channel, an antenna multiplexing unit and a splitter;
the receiving channel is respectively connected with the digital intermediate frequency unit and the antenna multiplexing unit;
the transmitting channel is respectively connected with the digital intermediate frequency unit and the antenna multiplexing unit;
the antenna multiplexing unit is respectively connected with the receiving channel, the transmitting channel and the branching unit;
one end of the splitter is connected to the antenna multiplexing unit, and the other end of the splitter is respectively connected to the antenna connected with the radio frequency channel unit where the splitter is located;
the receiving channel is used for acquiring the radio-frequency signals received by the antenna through the antenna multiplexing unit and the splitter, converting the radio-frequency signals into intermediate-frequency signals and sending the intermediate-frequency signals to the digital intermediate-frequency unit;
the transmitting channel is used for receiving the intermediate frequency signal sent by the digital intermediate frequency unit, converting the received intermediate frequency signal into a radio frequency signal and sending the radio frequency signal to the antenna through the antenna multiplexing unit and the splitter;
the antenna multiplexing unit is used for isolating the radio-frequency signal transmitted from the transmitting channel and sent to the antenna from the radio-frequency signal transmitted from the antenna;
the splitter is used for receiving the radio frequency signals transmitted from the antenna multiplexing unit and splitting the radio frequency signals into at least two paths of signals which are respectively transmitted to the antennas connected with the splitter.
Preferably, the splitter is a splitter divided into two parts, the radio frequency channel units corresponding to the splitter are respectively connected to the two antennas, and the splitter is configured to receive the radio frequency signal transmitted from the antenna multiplexing unit and split the radio frequency signal into two paths to transmit the two paths to the two antennas; alternatively, the first and second electrodes may be,
the splitter is a splitter with four branches, the radio frequency channel unit corresponding to the splitter is respectively connected with the four antennas, and the splitter is used for receiving the radio frequency signals transmitted from the antenna multiplexing unit and dividing the radio frequency signals into four paths to transmit the radio frequency signals to the four antennas.
Preferably, the antenna multiplexing unit includes a duplexer, and the duplexer includes three terminals respectively connected to the transmitting channel, the receiving channel, and the splitter; alternatively, the first and second electrodes may be,
the antenna multiplexing unit comprises a circulator and a protection switch, the circulator comprises three wiring ends, two of the wiring ends are respectively connected with the transmitting channel and the branching unit, the other wiring end is connected with one end of the protection switch, and the other end of the protection switch is connected with the receiving channel.
Preferably, the method further comprises the following steps:
and the indoor baseband processing module is connected with the digital intermediate frequency unit and used for receiving the baseband signal which is sent by the digital intermediate frequency unit and contains the uplink positioning information and positioning the terminal according to the baseband signal containing the uplink positioning information.
In a second aspect, the present invention further provides a positioning method, applied to any one of the above indoor base stations, where the method includes:
controlling connecting channels between at least two antennas and a signal processing module to be sequentially communicated according to a time sequence in a time period when a terminal sends uplink positioning information;
and respectively processing the sequentially acquired radio frequency signals containing the uplink positioning information to obtain processed signals for positioning the terminal.
The technical scheme of the invention has the following beneficial effects:
in the embodiment of the present invention, when the at least two antennas are disposed at indoor reasonable positions (if an internal antenna of an indoor base station is used, the positions are reasonably planned together with an external antenna), and connection channels between the at least two antennas and the signal processing module are sequentially connected according to a time sequence (when a connection channel corresponding to one of the antennas is connected, connection channels corresponding to other antennas are disconnected), during a period in which a terminal sends uplink positioning information, the signal processing module may respectively acquire radio frequency signals including the uplink positioning information received by the at least two antennas, and then process the radio frequency signals including the uplink positioning information to position the terminal. Therefore, the embodiment of the invention can improve the indoor positioning accuracy by only adding the external antenna and controlling the at least two antennas to be sequentially connected during the period of sending the uplink positioning information by the terminal, and compared with the scheme of improving the indoor positioning accuracy by increasing the deployment density of the indoor base station, the invention has the advantages of low equipment cost (because the cost of the antenna is far lower than that of the indoor base station), no influence on the current network coverage, no need of replanning the indoor coverage and low construction cost.
Drawings
Fig. 1 is a schematic diagram of a deployment architecture of a pico base station (indoor base station);
fig. 2 is a schematic structural diagram of an indoor base station according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another indoor base station according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of the indoor base station shown in fig. 3;
fig. 5 is a schematic structural diagram of an antenna multiplexing unit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another antenna multiplexing unit in the embodiment of the present invention;
fig. 7 is a schematic structural diagram of a third indoor base station in the embodiment of the present invention;
fig. 8 is a schematic structural diagram of a fourth indoor base station in the embodiment of the present invention;
fig. 9 is a flowchart illustrating a positioning method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an indoor base station according to an embodiment of the present invention, including:
the antenna comprises a signal processing module 1, at least two antennas 2 and a control module 3;
the signal processing module 1 is connected with each antenna 2 through a corresponding connecting channel 4;
at least one antenna 2 of the at least two antennas 2 is an external antenna connected with the signal processing module 1 through a cable;
the control module 3 is connected to the connection channel 4, and configured to control the connection channels 4 between the at least two antennas 2 and the signal processing module 1 to be sequentially connected according to a time sequence in a time period when a terminal sends uplink positioning information (also referred to as SRS), so that the signal processing module 1 sequentially obtains radio frequency signals, which are received by the at least two antennas 2 and include the uplink positioning information;
the signal processing module 1 is configured to process the acquired radio frequency signal including the uplink positioning information to obtain a processed signal, so as to position the terminal.
The indoor base station provided by the embodiment of the invention comprises at least two antennas 2, wherein at least one antenna 2 is an external antenna connected with the signal processing module 1 through a cable, and the control module 3 can control the connection channels 4 between the at least two antennas 2 and the signal processing module 1 to be sequentially connected according to a time sequence in a time period when the terminal sends uplink positioning information. Therefore, when the at least two antennas are respectively arranged at indoor reasonable positions and the connection channels 4 between the at least two antennas 2 and the signal processing module 1 are sequentially connected according to a time sequence in a time period when the terminal sends uplink positioning information (when the connection channel 4 corresponding to one of the antennas 2 is connected, the connection channels 4 corresponding to the other antennas 2 are disconnected to distinguish signals received by the antennas 2), the signal processing module 1 can respectively obtain the radio frequency signals containing the uplink positioning information received by the at least two antennas 2, and then process the radio frequency signals containing the uplink positioning information to position the terminal. Therefore, the embodiment of the invention can improve the indoor positioning accuracy by only adding the external antenna and controlling the at least two antennas 2 to be sequentially connected during the period of sending the uplink positioning information by the terminal, and compared with the scheme of improving the indoor positioning accuracy by increasing the deployment density of the indoor base station, the invention has the advantages of low equipment cost (because the cost of the antenna is far lower than that of the indoor base station), no influence on the current network coverage, no need of replanning the indoor coverage and low construction cost.
The following exemplifies a specific structure of the indoor base station.
In an alternative embodiment, referring to fig. 3, the signal processing module 1 includes:
the radio frequency channel unit 11 is connected with the at least two antennas 2 through corresponding connection channels, and is configured to acquire radio frequency signals including the uplink positioning information received by the at least two antennas 2 and convert the radio frequency signals into intermediate frequency signals;
and the digital intermediate frequency unit 12 is connected to the radio frequency channel unit 11, and is configured to receive the intermediate frequency signal sent by the radio frequency channel unit 11 and convert the intermediate frequency signal into a baseband signal.
In the embodiment of the present invention, the signal processing module 1 may include only one rf channel unit 11. And in a time period when the terminal sends the uplink positioning information, sequentially acquiring radio frequency signals which are received by the antennas 2 corresponding to the connecting channel 4 and contain the uplink positioning information according to the connection sequence of the connecting channel 4, and respectively processing the radio frequency signals received by each antenna 2 so as to position the terminal according to the processed signals.
In addition, in the embodiment of the present invention, the internal antenna of the indoor base station may also be used as one of the antennas, and the internal antenna and the external antenna are respectively disposed at indoor reasonable positions to receive the uplink positioning information sent by the terminal.
Preferably, referring to fig. 3, switches K are respectively disposed on the connection channels 4 between the at least two antennas 2 and the radio frequency channel unit 11;
the control module 3 is connected to the switch K, and configured to control the connection channels 4 between the at least two antennas 2 and the radio frequency channel unit 11 to be sequentially connected according to a time sequence by controlling the switch K in a time period when the terminal sends uplink positioning information, so that the radio frequency channel unit 11 can only obtain a signal received by one of the antennas 2 at the same time.
In the embodiment of the invention, the connection between the at least two antennas 2 and the radio frequency channel unit 11 is controlled to be sequentially connected according to the time sequence by controlling the switches K on the connecting channels 4 between the radio frequency channel unit 11 and the antennas 2 to be sequentially connected according to the time sequence, so that the structure is simple, and the control process is simple and convenient. In other time when the terminal sends the uplink positioning information, each switch K can keep a conducting state so as to normally realize the transceiving function of other signals.
In other embodiments, other methods besides a switch may be adopted to control the connection channels 4 between the at least two antennas 2 and the signal processing module 1 (specifically, the radio frequency channel unit 11) to be sequentially connected according to a time sequence.
Specifically, referring to fig. 4, the radio frequency channel unit 11 includes:
a receiving channel 112, a transmitting channel 111, an antenna multiplexing unit 113 and a splitter 114;
the receiving channel 112 is connected to the digital intermediate frequency unit 12 and the antenna multiplexing unit 113 respectively;
the transmitting channel 111 is respectively connected with the digital intermediate frequency unit 12 and the antenna multiplexing unit 113;
the antenna multiplexing unit 113 is connected to the receiving channel 112, the transmitting channel 111, and the splitter 114 respectively;
one end of the splitter 114 is connected to the antenna multiplexing unit 113, and the other end of the splitter 114 is connected to the antenna 2 connected to the rf channel unit 11 where the splitter 114 is located;
the receiving channel 112 is configured to obtain the radio frequency signal received by the antenna 2 through the antenna multiplexing unit 113 and the splitter 114, convert the radio frequency signal into an intermediate frequency signal, and send the intermediate frequency signal to the digital intermediate frequency unit 12;
a transmitting channel 111, configured to receive the intermediate frequency signal sent by the digital intermediate frequency unit 12, convert the received intermediate frequency signal into a radio frequency signal, and send the radio frequency signal to the antenna 2 through the antenna multiplexing unit 113 and the splitter 114;
an antenna multiplexing unit 113, configured to isolate the radio frequency signal transmitted from the transmitting channel 111 and used for being sent to the antenna 2 from the radio frequency signal transmitted from the antenna 2;
a splitter 114, configured to receive the radio frequency signal transmitted from the antenna multiplexing unit 113, and split the radio frequency signal into at least two paths to be transmitted to the antennas 2 connected to the splitter 114.
In the embodiment of the present invention, the radio frequency channel unit 11 includes not only the receiving channel 112, but also the transmitting channel 111, where the transmitting channel 111 is configured to receive the intermediate frequency signal sent by the digital intermediate frequency unit 12, convert the intermediate frequency signal into a radio frequency signal, and then send the radio frequency signal to the corresponding antenna 2 through the antenna multiplexing unit 113 and the splitter 114 in sequence, so as to send the radio frequency signal to the terminal. The antenna multiplexing unit 113 is configured to isolate the radio frequency signal transmitted from the transmitting channel 111 and used for being transmitted to the antenna 2 from the radio frequency signal transmitted from the antenna 2, so that the received signal and the transmitted signal do not interfere with each other, and thus, the antenna can be shared to implement signal transceiving. Therefore, the indoor base station provided by the embodiment of the invention can not only receive the uplink positioning information sent by the terminal, but also realize other communications with the terminal.
Optionally, the splitter 114 is a splitter divided into two parts, the rf channel unit 11 corresponding to the splitter 114 is connected to the two antennas 2, and the splitter 114 is configured to receive the rf signal transmitted from the antenna multiplexing unit 113 and divide the rf signal into two parts to transmit to the two antennas 2.
Or, the splitter 114 may also be a splitter that divides four, the rf channel unit 11 corresponding to the splitter 114 is connected to the four antennas 2, respectively, and the splitter 114 is configured to receive the rf signal transmitted from the antenna multiplexing unit 113 and divide the rf signal into four paths to transmit to the four antennas 2.
In the embodiment of the present invention, the splitter 114 may divide the received radio frequency signal into two or four signals and correspondingly send the two or four signals to the two antennas 2 or the four antennas 2, so that when the positioning accuracy of the indoor terminal is improved by adding the antennas 2, the indoor base station may normally implement other communication functions with the terminal.
In a specific implementation, the splitter 114 may also be another type of splitter, which is not limited herein.
Optionally, the external antenna may be a dual-polarized indoor-division antenna. Through reasonable antenna set point planning and antenna port power design, the signal coverage is more uniform and the signal quality is better.
Optionally, referring to fig. 5, the antenna multiplexing unit 113 includes a duplexer, and the duplexer includes three terminals, which are respectively connected to the transmitting channel 111, the receiving channel 112, and the splitter 114.
Alternatively, referring to fig. 6, the antenna multiplexing unit 113 may also include a circulator and a protection switch K1, where the circulator includes three terminals, two of the terminals are respectively connected to the transmitting channel 111 and the splitter 114, the other terminal is connected to one end of the protection switch K1, and the other end of the protection switch K1 is connected to the receiving channel 112. The protection switch K1 is used to disconnect the receiving channel 112 from the circulator when the transmitting channel 111 transmits a high power signal.
The indoor base station provided by the embodiment of the present invention may be a distributed pico base station (also abbreviated as pico RRU), wherein a baseband processing unit for positioning the terminal may be arranged at a remote location, as shown in fig. 1.
Alternatively, the indoor base station provided in the embodiment of the present invention may be an integrated pico-base station including an indoor baseband processing module (BBU, which may also be referred to as an indoor baseband processing unit). Specifically, the indoor baseband processing module (not shown in the figure) is connected to the digital intermediate frequency unit 12, and is configured to receive a baseband signal that includes the uplink positioning information and is sent by the digital intermediate frequency unit 12, and position the terminal according to the baseband signal that includes the uplink positioning information.
In another alternative embodiment, the antenna 2 is a multi-channel antenna;
the signal processing module 1 includes:
each radio frequency channel unit 11 is connected to the at least two antennas 2, and is configured to acquire a radio frequency signal including the uplink positioning information received by the at least two antennas 2, and convert the radio frequency signal into an intermediate frequency signal;
and the digital intermediate frequency unit 12 is respectively connected with the at least two radio frequency channel units 11, and is configured to receive the intermediate frequency signal sent by the radio frequency channel units 11 and convert the intermediate frequency signal into a baseband signal.
For example, referring to fig. 7, the antenna 2 may be a dual-channel antenna, and includes a first channel and a second channel, and the signal processing module 1 includes two rf channel units 11, where one of the rf channel units 11 is connected to the first channels of the at least two antennas 2, and the other of the rf channel units 11 is connected to the second channels of the at least two antennas 2.
In the indoor base station provided in the embodiment of the present invention, at least two radio frequency channel units 11 are provided and are respectively connected to the at least two antennas 2, and in a time period when the terminal sends uplink positioning information, if the connection channels 4 corresponding to the at least two radio frequency channel units 11 are all sequentially connected according to a time sequence (for example, if the connection channels 4 between the at least two antennas 2 and a first radio frequency channel unit 11 are sequentially connected according to a preset time sequence, the connection channels 4 between the at least two antennas 2 and a second radio frequency channel unit 11 are also sequentially connected according to the preset time sequence, and if the digital intermediate frequency unit 12 can distinguish signals from different radio frequency channel units 11, the connection channels 4 between the at least two antennas 2 and the second radio frequency channel unit can also be sequentially connected according to other time sequences), the reliability of the indoor base station for receiving the uplink positioning information can be improved, and the terminal can be timely and accurately positioned.
Optionally, a switch K is respectively disposed on a connection channel 4 between at least one of the radio frequency channel units 11 and the at least two antennas 2;
the control module 3 (not shown in fig. 7) is respectively connected to the switches K, and configured to control the connection channels 4 between the at least two antennas 2 and the at least one radio frequency channel unit 11 to be sequentially connected according to a time sequence by controlling the switches K in a time period when the terminal sends uplink positioning information, so that the at least one radio frequency channel unit 11 can only obtain a signal received by one of the antennas 2 at the same time.
In this embodiment, the at least two antennas 2 and the at least two connection channels 4 between the radio frequency channel units 11 may be controlled to be sequentially connected according to a time sequence, and then a switch K needs to be arranged on the connection channel 4 between each radio frequency channel unit 11 and each antenna 2. Or only the connection channels 4 between the at least two antennas 2 and one of the radio frequency channel units 11 may be controlled to be sequentially connected according to a time sequence, and then only the switches K need to be respectively arranged on the connection channels 4 between the at least two antennas and one of the radio frequency channel units 11. For example, when the antenna 2 is a dual-channel antenna including a first channel and a second channel, and there are only two rf channel units 11 in the signal processing module 1, one of the rf channel units 11 is connected to the first channels of the at least two antennas 2, and the other rf channel unit 11 is connected to the second channels of the at least two antennas 2, the switch K may be set only on the connection channel 4 connected to the first channel of each antenna 2, and the switch K is not set on the connection channel 4 connected to the second channel of each antenna 2.
In the embodiment of the present invention, when the connection channels between the at least two radio frequency channel units 11 and the at least two antennas 2 are synchronously and sequentially connected according to a time sequence, the reliability of receiving the uplink positioning information can be improved. When only one of the rf channel units 11 is sequentially connected to the connection channels 4 of the at least two antennas 2 according to a time sequence (i.e., only one of the rf channel units 11 is used for positioning the terminal, and the other rf channel units 11 are used for transceiving other signals), the circuit and the control process can be simplified.
Specifically, referring to fig. 7, in the embodiment of the present invention, each of the at least two rf channel units 11 may include a receiving channel 112, a transmitting channel 111, an antenna multiplexing unit 113, and a splitter 114, where the splitter 114 and the connection channel 4 of the antenna 2 are respectively provided with a switch K. When there are only two antennas 2, in the time period when the terminal sends the uplink positioning information, the switch K on the connection channel 4 (which may be the connection channels 4 respectively connected to the at least two radio frequency channel units 11) connected to the first antenna in the first time period (or the first uplink subframe) is turned on, the switch K on the connection channel 4 (which may be the connection channels 4 respectively connected to the at least two radio frequency channel units 11) connected to the second antenna 2 connected to the second antenna is turned off, the switch K on the connection channel 4 connected to the first antenna in the next time period (or the second uplink subframe) is turned off, and the switch K on the connection channel 4 connected to the second antenna is turned on. That is, in the first time period (or the first uplink subframe), the signal received by the first antenna is transmitted to the splitter 114 of the corresponding rf channel unit 11 through the first channel and the second channel, and then the splitter 114 transmits the signal to the antenna multiplexing unit 113 in the same rf channel unit 11 and transmits the signal to the digital intermediate frequency unit 12 through the receiving channel 112; the signal received by the second antenna cannot be transmitted to the digital intermediate frequency unit 12 through the rf channel unit 11 because the switch K on the connection channel 4 between the second antenna and the corresponding rf channel unit 11 is disconnected. Or, only one rf channel unit 11 may receive signals received by two antennas 2 in a time-sharing manner, and the other rf channel unit 11 may receive signals received by two antennas 2 simultaneously, during the period that the terminal sends the uplink positioning information, if the switch K is disposed on the connection channel 4 between the splitter 114 in one rf channel unit 11 and two antennas 2.
In a third alternative embodiment, referring to fig. 8, the signal processing module 1 includes:
four radio frequency channel units 11, wherein two of the radio frequency channel units 11 are respectively connected to a part of the antennas of the at least two antennas 2, the other two of the radio frequency channel units 11 are respectively connected to the rest of the antennas of the at least two antennas, and the radio frequency channel units 11 are configured to acquire radio frequency signals containing the uplink positioning information received by the part of the antennas connected thereto, and convert the radio frequency signals into intermediate frequency signals;
and the digital intermediate frequency unit 12 is respectively connected with the four radio frequency channel units 11, and is configured to receive the intermediate frequency signals sent by the radio frequency channel units 11 and convert the intermediate frequency signals into baseband signals.
For example, the antennas 2 are four, which are respectively a first antenna, a second antenna, a third antenna and a fourth antenna, the antennas 2 may be dual-channel antennas, which include a first channel and a second channel, and the four rf channel units 11 are respectively a first rf channel unit, a second rf channel unit, a third rf channel unit and a fourth rf channel unit. The first radio frequency channel unit is connected with the first channels of the first antenna and the second antenna respectively, the second radio frequency channel unit is connected with the second channels of the first antenna and the second antenna respectively, the third radio frequency channel unit is connected with the first channels of the third antenna and the fourth antenna respectively, and the fourth radio frequency channel unit is connected with the second channels of the third antenna and the fourth antenna respectively, so that an indoor base station with four receiving and four transmitting functions is formed.
The indoor base station provided by the embodiment of the invention can not only improve the reliability of receiving uplink data (including uplink positioning information), but also improve the speed of downlink data.
In addition, in the indoor base station, the connection channel 4 between each channel of each antenna 2 and the radio frequency channel unit 11 is provided with a switch K. The control module 3 (not shown in fig. 8) is connected to the switches K, and configured to control the four antennas to be sequentially connected to the connection channels 4 of the corresponding radio frequency channel units 11 according to a time sequence by controlling the switches K in a time period when the terminal sends the uplink positioning information. Namely:
in a first time period (or a first uplink subframe), only the connection channel 4 between the first antenna and the first radio frequency channel unit and the connection channel 4 between the first antenna and the second radio frequency channel unit are turned on (specifically, the switches K on the two connection channels 4 are closed), and the other connection channels 4 are turned off (specifically, the switches K on the other connection channels 4 are turned off);
in the second time period (or the second uplink subframe), only the connection channel 4 between the second antenna and the first radio frequency channel unit and the connection channel 4 between the second antenna and the second radio frequency channel unit are turned on (specifically, the switches K on the two connection channels 4 are closed), and the other connection channels 4 are turned off (specifically, the switches K on the other connection channels 4 are turned off);
in a third time period (or a third uplink subframe), only the connection channel 4 between the third antenna and the third rf channel unit and the connection channel 4 between the third antenna and the fourth rf channel unit are turned on (specifically, the switches K on the two connection channels 4 are closed), and the other connection channels 4 are turned off (specifically, the switches K on the other connection channels 4 are turned off);
in a fourth time period (or a fourth uplink subframe), only the connection channel 4 between the fourth antenna and the third radio frequency channel unit and the connection channel 4 between the fourth antenna and the third radio frequency channel unit are turned on (specifically, the switches K on the two connection channels are closed), and the other connection channels 4 are turned off (specifically, the switches K on the other connection channels 4 are turned off);
or, in the above-mentioned indoor base station, the switch K is provided on the connection channel 4 between only one channel of each antenna 2 and the corresponding radio frequency channel unit 11, and the connection channel 4 between the other channel of each antenna 2 and the corresponding radio frequency channel unit 11 is always kept in the on state (including in the time period when the terminal sends the uplink positioning information or in other time periods). Specifically, a switch K is disposed on a connection channel 4 between the first antenna and the first radio frequency channel unit, the connection channel 4 between the first antenna and the second radio frequency channel unit is not provided with the switch K but maintains a connected state, the connection channel 4 between the second antenna and the first radio frequency channel unit is provided with the switch K, the connection channel 4 between the second antenna and the second radio frequency channel unit is not provided with the switch K but maintains a connected state, the connection channel 4 between the third antenna and the third radio frequency channel unit is provided with the switch K, the connection channel 4 between the third antenna and the fourth radio frequency channel unit is not provided with the switch K but maintains a connected state, the connection channel 4 between the fourth antenna and the third radio frequency channel unit is provided with the switch K, and the connection channel 4 between the fourth antenna and the fourth radio frequency channel unit is not provided with the switch K but maintains a connected state.
In the embodiment of the present invention, the specific structure of the radio frequency channel unit 11 may refer to the above embodiments, and details are not described herein.
Referring to fig. 9, fig. 9 is a schematic flow chart of a positioning method according to another embodiment of the present invention, which can be applied to any of the indoor base stations in the foregoing embodiments, where the method includes:
step 11: controlling connecting channels between at least two antennas and a signal processing module to be sequentially communicated according to a time sequence in a time period when a terminal sends uplink positioning information;
step 12: and respectively processing the sequentially acquired radio frequency signals containing the uplink positioning information to obtain processed signals for positioning the terminal.
In the embodiment of the present invention, when the at least two antennas of the indoor base station are disposed at indoor reasonable positions (if an internal antenna of the indoor base station is used, the positions are reasonably planned together with an external antenna), and connection channels between the at least two antennas and the signal processing module are sequentially connected according to a time sequence in a time period when the terminal sends uplink positioning information (when a connection channel corresponding to one of the antennas is connected, connection channels corresponding to other antennas are disconnected to distinguish signals received by the antennas 2), the signal processing module may respectively obtain radio frequency signals received by the at least two antennas and including the uplink positioning information, and then process the radio frequency signals including the uplink positioning information to position the terminal. Therefore, the embodiment of the invention can improve the indoor positioning accuracy by only adding the external antenna and controlling the at least two antennas to be sequentially connected during the period of sending the uplink positioning information by the terminal, and compared with the scheme of improving the indoor positioning accuracy by increasing the deployment density of the indoor base station, the invention has the advantages of low equipment cost (because the cost of the antenna is far lower than that of the indoor base station), no influence on the current network coverage, no need of replanning the indoor coverage and low construction cost.
The indoor Base Station in the embodiment of the present invention may be a Base Transceiver Station (BTS) in Global System for mobile communications (GSM) or Code Division Multiple Access (CDMA), may also be a Base Station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), may also be an evolved Node B (evolved Node B, eNB or eNodeB) in LTE, or a relay Station or Access point, or a Base Station in a future 5G network, and the like, which is not limited herein.
A terminal in embodiments of the present invention may be a wireless terminal, which may be a device that provides voice and/or other traffic data connectivity to a user, a handheld device having wireless connection capability, or other processing device connected to a wireless modem. A wireless terminal, which may be a mobile terminal such as a mobile telephone (or "cellular" telephone) and a computer having a mobile terminal, e.g., a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device, may communicate with one or more core networks via a Radio Access Network (RAN), and may exchange language and/or data with the RAN. For example, devices such as Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs) are used. The wireless Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), a Remote Terminal (Remote Terminal), an access Terminal (access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), and a Terminal (User Device or User Equipment), which are not limited herein.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (11)
1. An indoor base station, comprising:
the device comprises a signal processing module, at least two antennas and a control module;
the signal processing module is connected with each antenna through a corresponding connecting channel;
at least one antenna of the at least two antennas is an external antenna connected with the signal processing module through a cable;
the control module is connected with the connection channel and is used for controlling the connection channel between the at least two antennas and the signal processing module to be sequentially connected according to a time sequence in a time period when the terminal sends uplink positioning information, so that the signal processing module sequentially acquires radio frequency signals which are received by the at least two antennas and contain the uplink positioning information;
and the signal processing module is used for processing the acquired radio frequency signal containing the uplink positioning information to obtain a processed signal for positioning the terminal.
2. The indoor base station of claim 1, wherein the signal processing module comprises:
the radio frequency channel unit is respectively connected with the at least two antennas through corresponding connecting channels and is used for acquiring radio frequency signals which are received by the at least two antennas and contain the uplink positioning information and converting the radio frequency signals into intermediate frequency signals;
and the digital intermediate frequency unit is connected with the radio frequency channel unit and used for receiving the intermediate frequency signal sent by the radio frequency channel unit and converting the intermediate frequency signal into a baseband signal.
3. The indoor base station of claim 2, wherein a switch is respectively disposed on a connection channel between the at least two antennas and the radio frequency channel unit;
and the control module is respectively connected with the switches and used for controlling the connection channels between the at least two antennas and the radio frequency channel unit to be sequentially connected according to a time sequence by controlling the switches in a time period when the terminal sends uplink positioning information.
4. The indoor base station of claim 1, wherein the signal processing module comprises:
each radio frequency channel unit is respectively connected with the at least two antennas and is used for acquiring radio frequency signals which are received by the at least two antennas and contain the uplink positioning information and converting the radio frequency signals into intermediate frequency signals;
and the digital intermediate frequency unit is respectively connected with the at least two radio frequency channel units and is used for receiving the intermediate frequency signals sent by the radio frequency channel units and converting the intermediate frequency signals into baseband signals.
5. The indoor base station of claim 4, wherein a switch is respectively disposed on a connection channel between at least one of the radio frequency channel units and the at least two antennas;
the control module is connected with the switches respectively and is used for controlling the connection channels between the at least two antennas and the at least one radio frequency channel unit to be sequentially connected according to a time sequence by controlling the switches in a time period when the terminal sends uplink positioning information.
6. The indoor base station of claim 1, wherein the signal processing module comprises:
the four radio frequency channel units are respectively connected with one part of the antennas in the at least two antennas, the other two radio frequency channel units are respectively connected with the other parts of the antennas in the at least two antennas, and the radio frequency channel units are used for acquiring radio frequency signals which contain the uplink positioning information and are received by the connected parts of the antennas and converting the radio frequency signals into intermediate frequency signals;
and the digital intermediate frequency unit is respectively connected with the four radio frequency channel units and is used for receiving the intermediate frequency signals sent by the radio frequency channel units and converting the intermediate frequency signals into baseband signals.
7. The indoor base station of claim 2, 4 or 6, wherein the radio frequency channel unit comprises:
the system comprises a receiving channel, a transmitting channel, an antenna multiplexing unit and a splitter;
the receiving channel is respectively connected with the digital intermediate frequency unit and the antenna multiplexing unit;
the transmitting channel is respectively connected with the digital intermediate frequency unit and the antenna multiplexing unit;
the antenna multiplexing unit is respectively connected with the receiving channel, the transmitting channel and the branching unit;
one end of the splitter is connected to the antenna multiplexing unit, and the other end of the splitter is respectively connected to the antenna connected with the radio frequency channel unit where the splitter is located;
the receiving channel is used for acquiring the radio-frequency signals received by the antenna through the antenna multiplexing unit and the splitter, converting the radio-frequency signals into intermediate-frequency signals and sending the intermediate-frequency signals to the digital intermediate-frequency unit;
the transmitting channel is used for receiving the intermediate frequency signal sent by the digital intermediate frequency unit, converting the received intermediate frequency signal into a radio frequency signal and sending the radio frequency signal to the antenna through the antenna multiplexing unit and the splitter;
the antenna multiplexing unit is used for isolating the radio-frequency signal transmitted from the transmitting channel and sent to the antenna from the radio-frequency signal transmitted from the antenna;
the splitter is used for receiving the radio frequency signals transmitted from the antenna multiplexing unit and splitting the radio frequency signals into at least two paths of signals which are respectively transmitted to the antennas connected with the splitter.
8. The indoor base station of claim 7,
the splitter is a splitter divided into two parts, the radio frequency channel units corresponding to the splitter are respectively connected with the two antennas, and the splitter is used for receiving the radio frequency signals transmitted from the antenna multiplexing unit and dividing the radio frequency signals into two paths to transmit the two paths to the two antennas; alternatively, the first and second electrodes may be,
the splitter is a splitter with four branches, the radio frequency channel unit corresponding to the splitter is respectively connected with the four antennas, and the splitter is used for receiving the radio frequency signals transmitted from the antenna multiplexing unit and dividing the radio frequency signals into four paths to transmit the radio frequency signals to the four antennas.
9. The indoor base station of claim 7, wherein the antenna multiplexing unit comprises a duplexer, and the duplexer comprises three terminals connected to the transmitting channel, the receiving channel, and the splitter, respectively; alternatively, the first and second electrodes may be,
the antenna multiplexing unit comprises a circulator and a protection switch, the circulator comprises three wiring ends, two of the wiring ends are respectively connected with the transmitting channel and the branching unit, the other wiring end is connected with one end of the protection switch, and the other end of the protection switch is connected with the receiving channel.
10. The indoor base station according to claim 2, 4 or 6, further comprising:
and the indoor baseband processing module is connected with the digital intermediate frequency unit and used for receiving the baseband signal which is sent by the digital intermediate frequency unit and contains the uplink positioning information and positioning the terminal according to the baseband signal containing the uplink positioning information.
11. A positioning method applied to the indoor base station according to any one of claims 1 to 10, the method comprising:
controlling connecting channels between at least two antennas and a signal processing module to be sequentially communicated according to a time sequence in a time period when a terminal sends uplink positioning information;
and respectively processing the sequentially acquired radio frequency signals containing the uplink positioning information to obtain processed signals for positioning the terminal.
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