CN111163421B - Small base station coverage system - Google Patents
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- CN111163421B CN111163421B CN202010146898.9A CN202010146898A CN111163421B CN 111163421 B CN111163421 B CN 111163421B CN 202010146898 A CN202010146898 A CN 202010146898A CN 111163421 B CN111163421 B CN 111163421B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/021—Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences
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- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
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- H—ELECTRICITY
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- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- H—ELECTRICITY
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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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Abstract
The present application relates to a small cell coverage system, comprising: the cell positioning distributed unit subsystem is used for acquiring a Bluetooth measuring signal and an uplink radio frequency signal sent by a terminal, converting the Bluetooth measuring signal and the uplink radio frequency signal into a first uplink baseband digital signal and sending the first uplink baseband digital signal to the cell positioning switching unit subsystem; the Bluetooth measurement signal carries the position information of the terminal; the cell positioning switching unit subsystem is used for converting the first uplink baseband digital signal into a second uplink baseband digital signal and sending the second uplink baseband digital signal to the cell positioning access unit subsystem; the cell positioning access unit subsystem is used for analyzing the second uplink baseband digital signal to obtain uplink baseband data and Bluetooth measurement data, transmitting the uplink baseband data to the core network and transmitting the Bluetooth measurement data to the positioning server subsystem; and the positioning server subsystem is used for positioning the terminal according to the Bluetooth measurement data. The system can reduce the cost.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a small cell coverage system.
Background
At present, based on the continuous improvement of the positioning technology of the terminal in the mobile communication network, the application of the location service is developed vigorously, and the location service permeates into aspects of social life, such as various information services derived from location information, such as navigation service, location push, association search, big data behavior, and the like.
One conventional bluetooth positioning technology is based on a bluetooth positioning system to implement bluetooth positioning; specifically, the bluetooth positioning system includes: a server, a plurality of Bluetooth gateways and a plurality of Bluetooth beacons; the bluetooth beacon is used for broadcasting a bluetooth reference Signal, the bluetooth gateway is used for receiving a bluetooth measurement Signal (RSSI, Received Signal Strength Indication) which is sent by the terminal through a Wi-Fi network (wireless network) and is measured aiming at the bluetooth reference Signal, and sending the bluetooth measurement Signal to the server, and the server is used for positioning the terminal according to the Received bluetooth measurement Signal.
However, the above bluetooth positioning system has a problem of excessive cost.
Disclosure of Invention
In view of the above, it is necessary to provide a small cell coverage system capable of reducing the cost.
A small base station coverage system, the system comprising:
the cell positioning distributed unit subsystem is used for acquiring a Bluetooth measuring signal and an uplink radio frequency signal sent by a terminal, converting the Bluetooth measuring signal and the uplink radio frequency signal into a first uplink baseband digital signal and sending the first uplink baseband digital signal to the cell positioning switching unit subsystem; the Bluetooth measurement signal carries position information of the terminal;
the cell positioning switching unit subsystem is connected with at least one cell positioning distributed unit subsystem and is used for converting the first uplink baseband digital signal into a second uplink baseband digital signal and sending the second uplink baseband digital signal to the cell positioning access unit subsystem; wherein the transmission speed of the first uplink baseband digital signal is lower than the transmission speed of the second uplink baseband digital signal;
the cell positioning access unit subsystem is connected between a core network and at least one cell positioning switching unit subsystem and is used for analyzing the second uplink baseband digital signal to obtain uplink baseband data and Bluetooth measurement data, sending the uplink baseband data to the core network and sending the Bluetooth measurement data to the positioning server subsystem;
and the positioning server subsystem is connected with the cell positioning access unit subsystem and used for positioning the terminal according to the Bluetooth measurement data.
In one embodiment, each cell positioning switching unit subsystem is connected with at least one positioning subsystem group, different positioning subsystem groups are located in different reference positioning areas, and each positioning subsystem group comprises at least one cell positioning distributed unit subsystem; the cell positioning distributed unit subsystem comprises a first Bluetooth module, wherein the first Bluetooth module is used for broadcasting a Bluetooth reference signal and acquiring a Bluetooth measurement signal sent by a terminal; the bluetooth measurement signal carries a receiving intensity value of the terminal for the bluetooth reference signal.
In one embodiment, the positioning subsystem group comprises at least three cell positioning distributed unit subsystems; the bluetooth measurement signal also carries an identifier of a bluetooth module that sends the bluetooth reference signal.
In one embodiment, the positioning subsystem group comprises one cell positioning distributed unit subsystem and at least two bluetooth expansion subsystems connected with the cell positioning distributed unit subsystem; the Bluetooth expansion subsystem comprises a second Bluetooth module; the second Bluetooth module is used for broadcasting Bluetooth reference signals.
In one embodiment, the cell location distributed unit subsystem is in communication connection with the bluetooth expansion subsystem through an ethernet protocol, and is further configured to perform power over ethernet over the bluetooth expansion subsystem through an internet access.
In one embodiment, the cell positioning access unit subsystem is in communication connection with the cell positioning switching unit subsystem through a CPRI protocol/eccri protocol/ethernet protocol, and is in communication connection with the positioning server subsystem through an IP protocol; the cell positioning switching unit subsystem is in communication connection with the cell positioning distributed unit subsystem through an Ethernet protocol.
In one embodiment, the data packets corresponding to the first uplink baseband digital signal and the second uplink baseband digital signal include: the data package comprises a packet head, package data and a packet tail, wherein the package data comprises: bluetooth measurement data corresponding to the Bluetooth measurement signal and baseband data corresponding to the baseband signal; the header and the trailer comprise at least one of the following: ethernet preamble, destination media access control address, source media access control address, data type, virtual local area network identification, cyclic redundancy check, and packet interval.
In one embodiment, the positioning server subsystem is further configured to send bluetooth operation information to the cell positioning access unit subsystem; the Bluetooth operation information carries a Bluetooth media access control address;
the cell positioning access unit subsystem is also used for sending the Bluetooth operation information to the cell positioning distributed unit subsystem through the cell positioning exchange unit subsystem;
and the cell positioning distributed unit subsystem is also used for controlling and operating the Bluetooth module corresponding to the Bluetooth media access control address according to the Bluetooth operation information.
In one embodiment, the cell positioning access unit subsystem is further configured to receive downlink baseband data sent by the core network for the terminal, convert the downlink baseband data into a first downlink baseband digital signal, and send the first downlink baseband digital signal to the cell positioning switching unit subsystem;
the cell positioning switching unit subsystem is further configured to convert the first downlink baseband digital signal into a second downlink baseband digital signal, and send the second downlink baseband digital signal to the cell positioning distributed unit subsystem; wherein the transmission speed of the first downlink baseband digital signal is higher than the transmission speed of the second downlink baseband digital signal;
and the cell positioning distributed unit subsystem is further configured to convert the second downlink baseband digital signal into a downlink radio frequency signal, and send the downlink radio frequency signal to the terminal.
In one embodiment, the method further comprises the following steps:
and the gateway subsystem is connected between at least one cell positioning access unit subsystem and the core network, connected between at least one cell positioning access unit subsystem and the positioning server subsystem, and used for forwarding baseband data between the cell positioning access unit subsystem and the core network and forwarding Bluetooth measurement data between the cell positioning access unit subsystem and the positioning server subsystem.
In the small base station coverage system, the cell positioning distributed unit subsystem can acquire a Bluetooth measurement signal and an uplink radio frequency signal sent by a terminal, convert the Bluetooth measurement signal and the uplink radio frequency signal into a first uplink baseband digital signal, convert the first uplink baseband digital signal into a second uplink baseband data signal through the cell positioning switching unit subsystem and send the second uplink baseband data signal to the cell positioning access unit subsystem; the cell positioning access unit subsystem can analyze the second uplink baseband digital signal to obtain uplink baseband data and Bluetooth measurement data, send the uplink baseband data to the core network to realize uplink transmission between the terminal and the core network, and send the Bluetooth measurement data to the positioning server subsystem to realize terminal positioning through the positioning server subsystem; therefore, the small cell coverage system of the embodiment can realize the coverage and terminal positioning of uplink signals, improve the utilization rate and application value of the small cell coverage system, and reduce the deployment difficulty and cost by multiplexing the cell positioning distributed unit subsystem-the cell positioning switching unit subsystem-the cell positioning access unit subsystem.
Drawings
Fig. 1 is a schematic environment diagram of a small cell coverage system according to an embodiment;
fig. 2 is a schematic structural diagram of a small base station coverage system in one embodiment;
fig. 3a is a schematic structural diagram of a small cell coverage system in one embodiment;
fig. 3b is a schematic structural diagram of a small cell coverage system in one embodiment;
fig. 4 is a schematic structural diagram of a small base station coverage system in one embodiment;
FIG. 5 is a diagram illustrating the packaging format of a packet in one embodiment;
FIG. 6 is a diagram illustrating a control process of a Bluetooth module in one embodiment;
FIG. 7a is a schematic diagram illustrating an exemplary configuration of a cell location distributed unit subsystem;
FIG. 7b is a diagram illustrating an exemplary configuration of a cell positioning switch unit subsystem;
FIG. 7c is a block diagram that illustrates a location server subsystem, in one embodiment;
figure 7d is a block diagram of a gateway subsystem 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 small cell coverage system provided in this embodiment may be applied in the wireless communication network shown in fig. 1, where the wireless communication network may include: the system comprises a core network, a small base station coverage system and a terminal, wherein the small base station coverage system can realize the communication between the core network and the terminal and can also realize the positioning of the terminal. The terminal may be a User Equipment (UE), a handheld device with a wireless communication function, a vehicle-mounted device, a wearable device, a computing device or other processing device connected to a wireless modem, a Mobile Station (MS), or the like, and the number of the terminals may be one or more.
In one embodiment, as shown in fig. 2, a small cell coverage system is provided, which is described by taking the environment in fig. 1 as an example and taking the above process as an example, and includes:
a cell positioning Distributed unit subsystem (DP, Distributed Part)21, configured to acquire a bluetooth measurement signal and an uplink radio frequency signal sent by a terminal, convert the bluetooth measurement signal and the uplink radio frequency signal into a first uplink baseband digital signal, and send the first uplink baseband digital signal to the cell positioning switching unit subsystem; the Bluetooth measurement signal carries the position information of the terminal;
a cell positioning switching unit subsystem (Hub)22, connected to at least one cell positioning distributed unit subsystem, for converting the first uplink baseband digital signal into a second uplink baseband digital signal and sending the second uplink baseband digital signal to the cell positioning access unit subsystem; the transmission speed of the first uplink baseband digital signal is lower than that of the second uplink baseband digital signal;
a cell positioning Access Unit subsystem (AU, Access Unit)23, connected between the core network and at least one cell positioning exchange Unit subsystem, for analyzing the second uplink baseband digital signal to obtain uplink baseband data and bluetooth measurement data, and sending the uplink baseband data to the core network and the bluetooth measurement data to the positioning server subsystem;
and the positioning server subsystem 24 is connected with the cell positioning access unit subsystem and is used for positioning the terminal according to the Bluetooth measurement data.
It should be noted that the first uplink baseband digital signal may be an interface signal between the cell positioning distributed unit subsystem and the cell positioning switching unit subsystem, and specifically may be a signal of a low-speed transmission link such as a network cable, where the network cable may be a twisted pair cable, such as a category 5 cable, an ultra category 5 cable, or a category 6 cable; the second uplink baseband digital signal may be an Interface signal between the cell positioning exchange unit subsystem and the cell positioning access unit subsystem, specifically, a signal adapted to a high-speed transmission link such as an optical fiber and a data bus, or a signal transmitted on a network line according to a Common Public Radio Interface (CPRI) or other protocols. Wherein, category 5 line (CAT 5): the transmission frequency is 100MHz, is used for voice transmission and data transmission with the highest transmission rate of 100Mbps, 5 types of wires are the most common Ethernet cables, the winding density of the cables is increased, and a high-quality insulating material is sheathed outside the cables; category 5 extra line (CAT5 e): the transmission frequency is 100MHz, is mainly used for gigabit Ethernet (1000Mbps), has the advantages of reduced attenuation, less crosstalk, higher ratio of attenuation to crosstalk (ACR) and signal-to-noise ratio (structured Return Loss), smaller delay error and greatly improved performance; category 6 line (CAT 6): the transmission frequency is 250MHz, is used for the application that transmission rate is higher than 1Gbps, mainly used gigabit Ethernet (1000Mbps), and has certain difference with five types or super five types of lines in appearance and structure, not only has increased insulating cross skeleton, places four pairs of lines of twisted pair in four grooves of cross skeleton respectively, and the diameter of cable is also thicker moreover.
The cell positioning switching unit subsystem 22 is in communication connection with at least one cell positioning distributed unit subsystem 21 through an ethernet protocol, that is, one cell positioning switching unit subsystem supports simultaneous access to multiple cell positioning distributed unit subsystems, and generally can simultaneously access 8-32 cell positioning distributed unit subsystems, so as to implement wireless coverage of multiple cells.
In an optional implementation, when the number of the cell positioning switching unit subsystems is multiple, the multiple cell positioning switching unit subsystems may be connected in a cascade manner; the two cascaded cell positioning switching unit subsystems can be connected through an Ethernet protocol, and each cell positioning switching unit subsystem can be in communication connection with at least one cell positioning distributed unit subsystem. That is to say, the cell positioning switching unit subsystem can be extended to a multi-stage cell positioning switching unit subsystem to meet the requirement of remote coverage of wireless signals in a large application scene.
For example, the cell location distributed unit subsystem 21 may receive an uplink radio frequency signal sent by a terminal and a bluetooth measurement signal sent by the terminal; then, based on the ethernet protocol, the uplink radio frequency signal and the bluetooth measurement signal are encapsulated into a first uplink baseband digital signal, and the first uplink baseband digital signal is sent to the cell positioning switching unit subsystem 22 through the ethernet protocol; the cell positioning switching unit subsystem 22 may perform conversion processing on the first uplink baseband digital signal to obtain a second uplink baseband digital signal conforming to the CPRI protocol, and send the second uplink baseband digital signal to the cell positioning access unit subsystem 23 through the CPRI protocol; the cell positioning access unit subsystem 23 may analyze the second uplink baseband digital signal to obtain uplink baseband data and bluetooth measurement data sent by the terminal, send the uplink baseband data to the core network through an optical fiber, and send the bluetooth measurement data to the positioning server subsystem 24 through an IP Protocol (Internet Protocol).
Accordingly, the positioning server subsystem 24 may receive a plurality of bluetooth measurement data sent from the cell positioning access unit subsystem 23 to form an initial measurement list, determine bluetooth measurement data related to the target terminal according to a terminal identifier carried in each bluetooth measurement data in the initial measurement list, and position the target terminal according to the bluetooth measurement data related to the target terminal.
Illustratively, each cell location distributed unit subsystem may include a bluetooth module that may broadcast a bluetooth reference signal, or a bluetooth signal by other bluetooth modules associated with each cell location distributed unit subsystem (see embodiments below); the terminal can receive a plurality of Bluetooth reference signals and measure the receiving intensity values of the plurality of Bluetooth reference signals.
In a possible implementation manner, the terminal may sort the plurality of bluetooth reference signals based on the reception intensity values of the plurality of bluetooth reference signals, obtain an identifier of a bluetooth module carried in a bluetooth reference signal with the highest reception intensity value, generate a bluetooth measurement signal carrying the identifier of the bluetooth module, and send the bluetooth measurement signal to the cell location distributed unit subsystem; the server can use the position of the Bluetooth module as the positioning position of the target terminal based on the preset corresponding relation between the Bluetooth module identification and the Bluetooth module position according to the Bluetooth module identification carried by the Bluetooth measurement data related to the target terminal.
In a possible implementation manner, the terminal may generate a bluetooth measurement signal carrying the identifier of the bluetooth module and the reception strength value based on the reception strength value of each bluetooth reference signal and the identifier of the bluetooth module carried by each bluetooth reference signal, and send the bluetooth measurement signal to the cell location distributed unit subsystem; the server can determine the positions of the three Bluetooth modules near the target terminal based on the preset corresponding relation between the Bluetooth module identifications and the Bluetooth module positions according to the Bluetooth module identifications carried by the three Bluetooth measurement data related to the target terminal, and calculate the positioning position of the target terminal according to the corresponding receiving intensity value and the three-point positioning algorithm. For example, the position coordinates of the three bluetooth modules may be (x1, y1), (x2, y2), (x3, y3), respectively; the distance D of the target terminal from the bluetooth module can be calculated through the reception intensity value corresponding to the position coordinates of each of the three bluetooth modules, so that the position coordinates of the target terminal can be calculated based on the distances D1, D2, D3 of the target terminal from the three bluetooth modules and the position coordinates of the three bluetooth modules.
When the number of the Bluetooth measurement data related to the target terminal exceeds three, the server can firstly reject the Bluetooth measurement data with the lower receiving intensity value through a preset receiving intensity threshold value, and/or select the three Bluetooth measurement data with the highest receiving intensity value for positioning, so as to improve the positioning accuracy. In addition, the server can perform a first-level coarse operation based on a three-point positioning algorithm to determine a preliminary position area of the target terminal; and then performing secondary fine operation on the primary position area based on improved algorithms such as a positioning improved algorithm of a fingerprint library and the like, wherein the calculation result is the positioning position of the target terminal.
In the small cell coverage system of this embodiment, the cell location distributed unit subsystem may obtain a bluetooth measurement signal and an uplink radio frequency signal sent by a terminal, convert the bluetooth measurement signal and the uplink radio frequency signal into a first uplink baseband digital signal, convert the first uplink baseband digital signal into a second uplink baseband data signal through the cell location switching unit subsystem, and send the second uplink baseband data signal to the cell location access unit subsystem; the cell positioning access unit subsystem can analyze the second uplink baseband digital signal to obtain uplink baseband data and Bluetooth measurement data, send the uplink baseband data to the core network to realize uplink transmission between the terminal and the core network, and send the Bluetooth measurement data to the positioning server subsystem to realize terminal positioning through the positioning server subsystem; therefore, the small cell coverage system of the embodiment can realize the coverage and terminal positioning of uplink signals, improve the utilization rate and application value of the small cell coverage system, and reduce the deployment difficulty and cost by multiplexing the cell positioning distributed unit subsystem-the cell positioning switching unit subsystem-the cell positioning access unit subsystem.
In one embodiment, the following procedure is taken as an example, and accordingly, in the small cell coverage system:
the cell positioning access unit subsystem 23 is further configured to receive downlink baseband data sent by the core network for the terminal, convert the downlink baseband data into a first downlink baseband digital signal, and send the first downlink baseband digital signal to the cell positioning switching unit subsystem;
the cell positioning switching unit subsystem 22 is further configured to convert the first downlink baseband digital signal into a second downlink baseband digital signal, and send the second downlink baseband digital signal to the cell positioning distributed unit subsystem; the transmission speed of the first downlink baseband digital signal is higher than that of the second downlink baseband digital signal;
the cell location distributed unit subsystem 21 is further configured to convert the second downlink baseband digital signal into a downlink radio frequency signal, and send the downlink radio frequency signal to the terminal.
The description of the first downlink baseband digital signal and the second downlink baseband digital signal may refer to the above description of the first uplink baseband digital signal and the second uplink baseband digital signal, and is not repeated here. Exemplarily, the cell positioning access unit subsystem may receive downlink baseband data sent by the core network, convert the downlink baseband data into a first downlink baseband digital signal conforming to a CPRI protocol based on the CPRI protocol between the cell positioning access unit subsystem and the cell positioning switching unit subsystem, and send the first downlink baseband digital signal to the cell positioning switching unit subsystem; the cell positioning switching unit subsystem can convert the first downlink baseband digital signal into a second downlink baseband digital signal based on an ethernet protocol, and send the second downlink baseband digital signal to the cell positioning distributed unit subsystem through the ethernet protocol; the cell location distributed unit subsystem may convert the second downlink baseband digital signal into a downlink radio frequency signal, and send the downlink radio frequency signal to a terminal.
The cell coverage system of the embodiment realizes the coverage of downlink signals while realizing the coverage of uplink signals and terminal positioning by the multiplexing cell positioning distributed unit subsystem-cell positioning switching unit subsystem-cell positioning access unit subsystem.
In one embodiment, each cell positioning switching unit subsystem is connected with at least one positioning subsystem group, different positioning subsystem groups are located in different reference positioning areas, and each positioning subsystem group comprises at least one cell positioning distributed unit subsystem; the cell positioning distributed unit subsystem comprises a first Bluetooth module, a second Bluetooth module and a third Bluetooth module, wherein the first Bluetooth module is used for broadcasting a Bluetooth reference signal and acquiring a Bluetooth measurement signal sent by a terminal; the bluetooth measurement signal carries a receiving strength value of the terminal for the bluetooth reference signal.
Different reference positioning positions can be preset, similarly, a positioning subsystem group can be deployed in each reference positioning area, and for example, a positioning subsystem group can be arranged at a distance of 10-25 meters; each cell positioning switching unit subsystem is connected with at least one positioning subsystem group, and each positioning subsystem group comprises at least one cell positioning distributed unit subsystem; the cell positioning distributed unit subsystem comprises a first Bluetooth module, a second Bluetooth module and a third Bluetooth module, wherein the first Bluetooth module is used for broadcasting a Bluetooth reference signal and acquiring a Bluetooth measurement signal sent by a terminal; the bluetooth measurement signal carries a receiving intensity value of the terminal for the bluetooth reference signal, and accordingly, the server can accurately position each terminal in each reference positioning area by using the measurement intensity value in the plurality of bluetooth measurement data associated with the terminal.
Referring to fig. 3a, a schematic structural diagram of a cell wireless coverage method provided in this embodiment is shown; in order to realize accurate positioning of a certain intelligent terminal, one method is to deploy at least three cell positioning distributed unit subsystems in each reference positioning area. The positioning subsystem group comprises at least three cell positioning distributed unit subsystems 21; the bluetooth measurement signal also carries an identifier of the bluetooth module that sent the bluetooth reference signal. Correspondingly, when the target terminal passes through a certain reference positioning area, the server can realize three-point positioning of the target terminal through the Bluetooth measurement signals sent by at least three cell positioning distributed unit subsystems in the reference positioning area; the bluetooth measurement signal sent by each cell location distributed unit subsystem carries the identifier of the first bluetooth module of each cell location distributed unit subsystem.
Fig. 3b is a schematic structural diagram of another cell radio coverage method according to an embodiment of the present invention; in order to realize accurate positioning of a certain intelligent terminal, the second method is to deploy a cell positioning distributed unit subsystem 21 and two Bluetooth expansion subsystems 25 in each reference positioning area. The positioning subsystem group comprises a cell positioning distributed unit subsystem and at least two Bluetooth expansion subsystems connected with the cell positioning distributed unit subsystem; the Bluetooth expansion subsystem comprises a second Bluetooth module; the second Bluetooth module is used for broadcasting the Bluetooth reference signal. Illustratively, the cell location distributed unit subsystem and the bluetooth extension subsystem may be connected and communicate based on RS485 (a communication interface related to single chip technology) and a serial port protocol.
Correspondingly, when the target terminal passes through a certain reference positioning area, the server may implement three-point positioning of the target terminal through at least three bluetooth measurement signals sent by the cell positioning distributed unit subsystem in the reference positioning area, where the at least three bluetooth measurement signals include: the terminal aims at a Bluetooth measurement signal A of a Bluetooth reference signal broadcasted by a first Bluetooth module of the cell positioning distributed unit subsystem and Bluetooth measurement signals B and C of Bluetooth reference signals broadcasted by second Bluetooth modules of the two Bluetooth expansion subsystems respectively. It should be noted that, the cell location distributed unit subsystem may receive the at least three bluetooth measurement signals A, B, C sent by the terminal; it can also receive the bluetooth measurement signal a sent by the terminal, and receive the bluetooth measurement signal B, C forwarded by the two bluetooth extension subsystems and originated from the terminal.
Optionally, the cell location distributed unit subsystem is in communication connection with the bluetooth expansion subsystem through an ethernet protocol, and the cell location distributed unit subsystem is further configured to perform ethernet power supply on the bluetooth expansion subsystem through the internet access, so that a flexible and convenient power supply mode is realized, and the adaptability of the small base station coverage system to the environment is improved.
It can be understood that the small cell coverage system shown in fig. 3a improves the wireless signal coverage density, which can improve the communication quality. Compared with the small base station coverage system shown in fig. 3a, the small base station coverage system shown in fig. 3b is equivalent to that two cell positioning distributed unit subsystems are replaced by two bluetooth expansion subsystems for each positioning subsystem group, so that the hardware cost related to radio frequency is reduced, and the cost is further reduced.
The first Bluetooth module and the second Bluetooth module can be Bluetooth beacons, Bluetooth communication processes such as broadcasting of Bluetooth reference signals and receiving of Bluetooth measurement signals are carried out based on a low-power-consumption Bluetooth protocol, and cost and power consumption can be reduced.
Illustratively, the bluetooth positioning procedure of the present embodiment is described from another aspect as follows:
(1) firstly, laying a cell positioning distributed unit subsystem in a reference positioning area, wherein a Bluetooth Beacon (Beacon) is built in the cell positioning distributed unit subsystem, generally at least 3 Bluetooth Beacons need to be laid, and a positioning algorithm requires that RSSI (received signal strength indicator) values of at least three points can be known to accurately calculate positioning;
(2) the bluetooth Beacon broadcasts a data packet (bluetooth reference signal) to the surrounding area at regular time intervals (for example, the default of the bluetooth Beacon is 100 milliseconds);
(3) when a terminal (such as a smart phone) enters a signal coverage area of a bluetooth Beacon, the terminal, as an independent bluetooth host, may receive a data packet (for example, the content of the data packet may contain at most 31 bytes) broadcasted by the bluetooth Beacon at intervals when performing a bluetooth scanning action;
(4) when the terminal receives a broadcasted data packet, the terminal can measure and obtain a receiving strength indicating value RSSI of a receiving signal when the data packet is received, and analyze and obtain an MAC address of a Bluetooth Beacon (each Bluetooth Beacon has a unique MAC address and an identifier of a Bluetooth module) of a data packet source; the RSSI value is a basis for determining the distance between the terminal and the Bluetooth Beacon;
(5) the terminal can generate a Bluetooth measuring signal according to the RSSI and the MAC address of the corresponding Bluetooth beacon, and sends the Bluetooth measuring signal to the cell positioning distributed unit subsystem;
(6) the positioning server can calculate the current specific position of the terminal based on the Bluetooth measuring signal, the positioning algorithm and the interaction with the map engine database.
Referring to fig. 4, taking the above fig. 3b as an example, based on the small cell coverage system shown in fig. 3b, the small cell coverage system of this embodiment may further include: a Gateway (GW) subsystem 26, connected between the at least one cell positioning access unit subsystem 23 and the core network, and connected between the at least one cell positioning access unit subsystem 23 and the positioning server subsystem 24, for forwarding baseband data between the cell positioning access unit subsystem and the core network, and forwarding bluetooth measurement data between the cell positioning access unit subsystem and the positioning server subsystem.
The gateway subsystem and the core network can be connected through optical fiber communication, connected with the cell positioning access unit subsystem through an IP protocol, and connected with the positioning server subsystem through the IP protocol. In an alternative embodiment, the gateway subsystem may include a data interface, and the cell positioning access unit subsystem includes a third generation partnership project 3GPP protocol interface; the data interface of the gateway subsystem is in communication connection with the 3GPP protocol interface of the cell positioning access unit subsystem through an IP protocol. In an alternative embodiment, when the number of cell positioning access unit subsystems is multiple, the gateway subsystem may be communicatively coupled to each of the multiple cell positioning access unit subsystems via an IP protocol.
The gateway subsystem can send uplink baseband data sent by the cell positioning access unit subsystem to the core network and send Bluetooth measurement data to the positioning server subsystem; the uplink baseband data includes uplink service data and/or uplink signaling data. The gateway subsystem routes the uplink service data to the core network on the basis of realizing the routing function of the uplink baseband data and the Bluetooth measurement data, converges the signaling data, and then carries out signaling data interaction with the core network through a unified signaling link, thereby greatly reducing the communication pressure of the signaling data at the core network side, avoiding communication congestion, improving the communication efficiency and ensuring the communication quality.
The gateway subsystem can also receive downlink baseband data sent by the core network and send the downlink baseband data to the cell positioning access unit subsystem; the downlink baseband data comprises downlink service data and downlink signaling data; the gateway subsystem can route the downlink service data to the cell positioning access unit subsystem on the basis of realizing the routing function of the downlink baseband data, converge the signaling data and then interact the signaling data with the core network through a uniform signaling link.
In the small cell coverage system of an embodiment, the cell positioning access unit subsystem and the cell positioning switching unit subsystem may be connected to the positioning server subsystem through CPRI (Common Public Radio Interface)/eCPRI (Enhanced Common Public Radio Interface)/ethernet protocol communication, and through IP protocol communication; the cell positioning switching unit subsystem is in communication connection with the cell positioning distributed unit subsystem through an Ethernet protocol. The system transmits among all subsystems based on an IP protocol, can adopt the traditional network cable to transmit data, deploys the same network, simultaneously realizes wireless coverage and positioning, reduces deployment difficulty and cost and improves application value of the network.
Referring to fig. 5, in the small cell coverage system of this embodiment, the data packets corresponding to the first uplink baseband digital signal and the second uplink baseband digital signal may include: package head, encapsulation data and package tail, the encapsulation data includes: bluetooth measurement data corresponding to the Bluetooth measurement signal and baseband data corresponding to the baseband signal; the header and the trailer include at least one of: an ethernet preamble, a Media Access Control (MAC) address, a source MAC address, a data type, a Virtual Local Area Network (VLAN) identifier, a Cyclic Redundancy Check (CRC), and a packet interval. The encapsulation format of the data packet of this embodiment provides a reliable way to implement simultaneous transmission of bluetooth measurement data and baseband data by multiplexing the cell positioning distributed unit subsystem-cell positioning switching unit subsystem-cell positioning access unit subsystem.
For example, an ethernet preamble of 8 bytes + a destination MAC address of 6 bytes + a source MAC address of 6 bytes + a data type of 2 bytes + a VLAN of 4 bytes identifies a packet interval of + base band data of N bytes + a CRC of 4 bytes +12 bytes, with an overhead of 42 bytes, where N is a positive integer of 10-64, typically 32. Of course, the encapsulated data may also include IP data; optionally, between the cell positioning access unit subsystem and the cell positioning switching unit subsystem, and between the cell positioning switching unit subsystem and the cell positioning distributed unit subsystem, data packets of baseband data, bluetooth measurement data, and IP data that may be carried by an ethernet protocol may be, as shown in fig. 5, respectively encapsulate a header and a trailer before and after the baseband data, bluetooth measurement data, or IP data.
Referring to fig. 6, a schematic diagram illustrating a bluetooth module control process of this embodiment is shown, which can implement operations such as setting, querying, and the like of a positioning server subsystem on each bluetooth module, specifically, in the small cell coverage system of this embodiment:
the positioning server subsystem is also used for sending Bluetooth operation information to the cell positioning access unit subsystem; the Bluetooth operation information carries a Bluetooth Media Access Control (MAC) address;
the cell positioning access unit subsystem is also used for sending the Bluetooth operation information to the cell positioning distributed unit subsystem through the cell positioning exchange unit subsystem;
and the cell positioning distributed unit subsystem is also used for controlling the Bluetooth module corresponding to the Bluetooth Media Access Control (MAC) address according to the Bluetooth operation information.
For example, referring to fig. 6, the positioning server subsystem may issue a single or multiple bluetooth setup/query messages to the cell positioning access unit subsystem; the sub-system of the cell positioning access unit transmits the received downlink information (including Bluetooth setting/inquiring information) to the sub-system of the cell positioning exchange unit; the sub-system of the cell positioning exchange unit forwards the downlink message (including the Bluetooth setting/inquiring information) to the sub-system of the cell positioning distributed unit; and the cell positioning distributed unit subsystem polls each Bluetooth module according to the Bluetooth MAC address carried in the Bluetooth setting/inquiring information so as to set/inquire a Bluetooth working mode, Bluetooth parameters and the like. The bluetooth working mode includes but is not limited to an active working mode, a passive working mode, a stop working mode, a failure working mode, etc.; the bluetooth parameters include, but are not limited to, transmission power, transmission period, etc. of the bluetooth reference signal.
In addition, when data transmission is performed between subsystems in a small cell coverage system, frequency synchronization and time synchronization between the subsystems are required, and for example, the time synchronization is taken as an example, two different frequency synchronization schemes are introduced as follows: in the first scheme, a physical link is adopted to extract a clock, that is, time delay is measured for multiple times and the minimum value is taken to complete time synchronization, and the method specifically comprises the following steps: the influence of IP data on the time delay of the baseband data is a probability event, that is, unaffected baseband data exists, the inherent time delay of a link can be estimated by measuring the time delay of the multi-baseband data for multiple times and taking the minimum value of the time delay, so that time synchronization is completed; scheme II: time synchronization is accomplished in accordance with the 1588V2 protocol (an institute of IEEE electrical and electronics engineers protocol for clocks), where the cell location switching unit subsystem and the cell location distributed unit subsystem support 1588V2 timestamp compensation. In short, the small cell coverage system of this embodiment implements the signal coverage and terminal positioning by the multiplexing cell positioning distributed unit subsystem-cell positioning switching unit subsystem-cell positioning access unit subsystem, and at the same time implements the control operation of the bluetooth module, and can implement multiple functions such as fault monitoring, parameter setting, status query, and the like, without additional cost.
Referring to fig. 7a, which is a schematic diagram of a system composition structure of the cell positioning distributed unit subsystem provided in this embodiment, the cell positioning distributed unit subsystem 21 may include: a protocol processing module 211, a digital radio frequency integrated module 212, a bluetooth transceiver module 213, and a bluetooth POE (Power Over Ethernet) Power supply module 214. The protocol processing module is used for performing de-framing and decoding processing on a second downlink baseband digital signal from the cell positioning switching unit subsystem to obtain a corresponding downlink baseband signal; meanwhile, protocol conversion processing of the Bluetooth measurement signal and the uplink radio frequency signal is realized, namely the Bluetooth measurement signal and the uplink baseband signal from the digital radio frequency integrated module are coded and framed to obtain a first uplink baseband digital signal and sent to the cell positioning switching unit subsystem; the digital radio frequency integrated module realizes the digital processing of uplink radio frequency signals and Bluetooth measurement signals or the radio frequency processing of downlink baseband signals; the Bluetooth receiving and transmitting module is used for receiving a Bluetooth measuring signal transmitted by a terminal and transmitting a Bluetooth reference signal; wherein, bluetooth POE power module, based on this module, the long-range POE power supply to bluetooth extension subsystem is realized to location DP subsystem, based on the RS485 interface to realize the communication of location DP subsystem realization and bluetooth extension subsystem through serial port protocol.
Fig. 7b is a schematic diagram of a system structure of a cell positioning switching unit subsystem according to this embodiment; the cell location switching unit subsystem 22 may include: an OAM (Operation Administration and Maintenance) module 221, a protocol conversion module 222, a bluetooth beacon forwarding module 223, and a POE (Power Over Ethernet) Power supply module 224. The OAM module mainly realizes the OAM function of the cell positioning switching unit subsystem, mainly completes the monitoring information interaction with the cell positioning access unit subsystem and the cell positioning distributed unit subsystem, and monitors the working state of the whole cell positioning switching unit subsystem, including the OAM functions of power-on starting process control, system module monitoring, alarm processing, software upgrading management, cell positioning distributed unit subsystem configuration and the like, and completes the multimode expansion and cell splitting functions together with the protocol conversion module; the protocol conversion module realizes the convergence of IQ data (orthogonal data) of uplink radio frequency signals and Bluetooth measurement signals of each cell positioning distributed unit subsystem and IQ data of a downlink (cascade) cell positioning switching unit subsystem, sends the converged IQ data to a cell positioning access unit subsystem or an uplink (cascade) cell positioning switching unit subsystem, and realizes the distribution of IQ data of the cell positioning access unit subsystem to each cell positioning switching unit subsystem and the downlink cell positioning switching unit subsystem; the conversion from the CPRI protocol to the Ethernet protocol and the Ethernet switching function are realized, and a channel is provided for the interaction of monitoring data between the OAM of the cell positioning switching unit subsystem and the OAM of the cell positioning access unit subsystem; the Bluetooth beacon forwarding module can perform coding processing on uplink Bluetooth RSSI signals of each cell positioning distributed unit subsystem and each Bluetooth expansion subsystem according to an Ethernet protocol and forwards the uplink Bluetooth RSSI signals to the uplink cell positioning access unit subsystem; the POE power supply module can provide remote power supply for the cell positioning distributed unit subsystem connected downwards based on the internet access.
Correspondingly, the cell positioning access unit subsystem can decode and decapsulate the second uplink baseband digital signal (including the uplink baseband signal and the bluetooth measurement signal), acquire uplink baseband data and bluetooth measurement data, and send the uplink baseband data and the bluetooth measurement data to the gateway subsystem through an IP protocol; or coding and packaging the downlink baseband data sent by the gateway subsystem based on the Ethernet protocol to obtain a first downlink baseband data signal, and sending the first downlink baseband data signal to the cell positioning switching unit subsystem.
Optionally, when the number of the cell positioning access unit subsystems is multiple, the gateway subsystem is in communication connection with each of the cell positioning access unit subsystems in the multiple cell positioning access unit subsystems through an ethernet protocol, and each of the cell positioning access unit subsystems may be in communication connection with the cell positioning switching unit subsystem through the ethernet protocol. In addition, in order to enable data to be transmitted in the small cell coverage system, the cell positioning access unit subsystem needs to encapsulate baseband data into a standard ethernet format, and a Virtual Local Area Network (VLAN) mechanism can be introduced according to a priority forwarding principle in consideration of high requirements of the baseband data on time delay and packet loss.
Exemplarily, referring to fig. 7c, a schematic diagram of a component structure of a positioning server subsystem is shown; the positioning server subsystem 24 may include: a bluetooth positioning algorithm module 241 and a map engine module 242, wherein the bluetooth positioning algorithm module can implement the bluetooth positioning algorithm processing in the above steps to obtain a logical position (i.e. a position represented by a logical number) of the terminal; the map engine module can match the logical position of the terminal with a preset map, obtain a physical position (for example, a position of latitude and longitude information) matched with the logical position of the terminal in the map, and display the position information of the terminal on the map through a visual interface, thereby realizing accurate positioning of the terminal.
Illustratively, referring to fig. 7d, a schematic diagram of a component structure of a gateway subsystem is shown; gateway subsystem 26 may include: an access module 261, a routing module 262, a signaling aggregation module 263 and a data forwarding module 264. In the uplink: the access module is used for receiving uplink baseband data sent by the cell positioning access unit subsystem through a data interface; the routing module is used for routing uplink signaling data in the uplink baseband data to the signaling convergence module and routing uplink service data in the uplink baseband data to the data forwarding module; the signaling convergence module is used for receiving and analyzing the signaling data and sending the analyzed signaling data to the core network; modifying the source IP address of the signaling data into the IP address of the gateway subsystem, modifying the target IP address into the IP address of the core network, converting the user identification into a user mark which is unique relative to the gateway subsystem, and sending the signaling data to the core network; and the data forwarding module is used for forwarding the service data to the core network. In the downlink: the data forwarding module is used for receiving downlink service data sent by a core network and forwarding the downlink service data to the routing module; the signaling convergence module is used for converging and analyzing response signaling data issued by the core network, modifying a source IP address of the response signaling data into an IP address of the gateway subsystem, modifying a target IP address into an IP address of the cell positioning access unit subsystem, converting the user identification into a unique user identification relative to the base station, and sending the response signaling data to the routing module; the routing module is used for positioning the access unit subsystem according to the destination cell responding to the signaling data or the downlink service data and routing the access unit subsystem to the corresponding data interface of the access module; and an access module, configured to send the response signaling data or the downlink service data to a 3GPP protocol interface (e.g., S1 interface protocol, such as a communication interface between the base station and the EPC) of the corresponding cell positioning access unit subsystem through a data interface.
The modules in the above embodiments may be implemented in whole or in part by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent of a processor in the corresponding device, and can also be stored in a memory of the corresponding device in a software form, so that the processor can call and execute operations corresponding to the modules.
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, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A small cell coverage system, the system comprising:
the cell positioning distributed unit subsystem is used for acquiring a Bluetooth measuring signal and an uplink radio frequency signal sent by a terminal, converting the Bluetooth measuring signal and the uplink radio frequency signal into a first uplink baseband digital signal and sending the first uplink baseband digital signal to the cell positioning switching unit subsystem; the Bluetooth measurement signal carries position information of the terminal;
the cell positioning switching unit subsystem is connected with at least one cell positioning distributed unit subsystem and is used for converting the first uplink baseband digital signal into a second uplink baseband digital signal and sending the second uplink baseband digital signal to the cell positioning access unit subsystem; wherein the transmission speed of the first uplink baseband digital signal is lower than the transmission speed of the second uplink baseband digital signal;
the cell positioning access unit subsystem is connected between a core network and at least one cell positioning switching unit subsystem and is used for analyzing the second uplink baseband digital signal to obtain uplink baseband data and Bluetooth measurement data, sending the uplink baseband data to the core network and sending the Bluetooth measurement data to a positioning server subsystem;
and the positioning server subsystem is connected with the cell positioning access unit subsystem and used for positioning the terminal according to the Bluetooth measurement data.
2. The system of claim 1, wherein each cell positioning switching unit subsystem is connected with at least one positioning subsystem group, different positioning subsystem groups are located in different reference positioning areas, and each positioning subsystem group comprises at least one cell positioning distributed unit subsystem; the cell positioning distributed unit subsystem comprises a first Bluetooth module, wherein the first Bluetooth module is used for broadcasting a Bluetooth reference signal and acquiring a Bluetooth measurement signal sent by a terminal; the bluetooth measurement signal carries a receiving intensity value of the terminal for the bluetooth reference signal.
3. The system of claim 2, wherein the positioning subsystem group comprises at least three of the cell positioning distributed element subsystems; the bluetooth measurement signal also carries an identifier of a bluetooth module that sends the bluetooth reference signal.
4. The system according to claim 2, wherein said positioning subsystem group comprises one said cell positioning distributed unit subsystem, and at least two bluetooth extension subsystems connected to said cell positioning distributed unit subsystem; the Bluetooth expansion subsystem comprises a second Bluetooth module; the second Bluetooth module is used for broadcasting Bluetooth reference signals.
5. The system of claim 4, wherein the cell location distributed unit subsystem is communicatively connected to the bluetooth extension subsystem via an ethernet protocol, and the cell location distributed unit subsystem is further configured to power over ethernet for the bluetooth extension subsystem via an internet access.
6. The system according to claim 1, wherein said cell positioning access unit subsystem is communicatively connected to said cell positioning switching unit subsystem via CPRI protocol/eccri protocol/ethernet protocol, and is communicatively connected to said positioning server subsystem via IP protocol; the cell positioning switching unit subsystem is in communication connection with the cell positioning distributed unit subsystem through an Ethernet protocol.
7. The system of claim 1, wherein the data packets corresponding to the first uplink baseband digital signal and the second uplink baseband digital signal comprise: the data package comprises a packet head, package data and a packet tail, wherein the package data comprises: bluetooth measurement data corresponding to the Bluetooth measurement signal and baseband data corresponding to the baseband signal; the header and the trailer comprise at least one of the following: ethernet preamble, destination media access control address, source media access control address, data type, virtual local area network identification, cyclic redundancy check, and packet interval.
8. The system of claim 1,
the positioning server subsystem is also used for sending Bluetooth operation information to the cell positioning access unit subsystem; the Bluetooth operation information carries a Bluetooth media access control address;
the cell positioning access unit subsystem is also used for sending the Bluetooth operation information to the cell positioning distributed unit subsystem through the cell positioning exchange unit subsystem;
and the cell positioning distributed unit subsystem is also used for controlling and operating the Bluetooth module corresponding to the Bluetooth media access control address according to the Bluetooth operation information.
9. The system of claim 1,
the cell positioning access unit subsystem is further configured to receive downlink baseband data sent by the core network for the terminal, convert the downlink baseband data into a first downlink baseband digital signal, and send the first downlink baseband digital signal to the cell positioning switching unit subsystem;
the cell positioning switching unit subsystem is further configured to convert the first downlink baseband digital signal into a second downlink baseband digital signal, and send the second downlink baseband digital signal to the cell positioning distributed unit subsystem; wherein the transmission speed of the first downlink baseband digital signal is higher than the transmission speed of the second downlink baseband digital signal;
and the cell positioning distributed unit subsystem is further configured to convert the second downlink baseband digital signal into a downlink radio frequency signal, and send the downlink radio frequency signal to the terminal.
10. The system of any one of claims 1-9, further comprising:
and the gateway subsystem is connected between at least one cell positioning access unit subsystem and the core network, connected between at least one cell positioning access unit subsystem and the positioning server subsystem, and used for forwarding baseband data between the cell positioning access unit subsystem and the core network and forwarding Bluetooth measurement data between the cell positioning access unit subsystem and the positioning server subsystem.
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| CN112738885B (en) * | 2020-12-22 | 2023-06-02 | 超讯通信股份有限公司 | Method for managing small base station |
| CN112713939B (en) * | 2020-12-25 | 2022-03-29 | 中国联合网络通信集团有限公司 | Data transmission method and device |
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