CN104735689A - Mobile communication network air interface monitoring system - Google Patents

Abstract

The invention discloses a monitoring system for an air interface of a mobile communication network. A signal collector receives an air interface signal, and selects narrowband sampling or wideband sampling to perform preliminary quantification on the air interface signal according to channel configuration information of a cell to be monitored; a signal processing unit After receiving the preliminary quantified data, according to the different network types of the cells to be monitored, different digital signal processing functions are selected to demodulate the preliminary quantized data, and the sub-channel data of single or multiple physical channels are output; signaling After the analysis unit receives the sub-channel data, it selects the processing module in the program according to the network structure of the cell to be monitored, processes the data and outputs the signaling report transmitted in the logical channel; the system control unit controls the entire system locally or remotely and monitoring. The invention realizes the analysis of the signaling of the uplink and downlink communication of the air interface of the mobile communication network through the combination of the software radio platform and the general computer.

Description

Mobile Communication Network Air Interface Monitoring System

technical field

The invention belongs to the technical field of mobile communication networks, and in particular relates to a mobile communication network air interface monitoring system based on software radio technology.

Background technique

The mobile communication network is the basis for mobile operators to operate. The operating efficiency and the income brought to the operator ultimately depend on the coverage area of the network, the capacity of the network system, and the quality of service. The most important part is the wireless network interface. The air interface of the mobile communication network system is the most important interface in the mobile communication network system. In the operation of the mobile communication network system, the air interface, as the wireless interface for communication between the mobile terminal and the base station, is easily affected by various factors, and there are many factors that induce instability. The protocol and signaling of the mobile communication system Messaging is more complex than a wired network interface. When monitoring the mobile communication system, real-time monitoring of the air interface becomes the key, so that more accurate analysis of network failures can be implemented. At the same time, the analysis of the air interface is also an important part of mobile network planning, network optimization and network evaluation. Due to the complex and changeable wireless network air environment, one of the hot spots that mobile network operators pay attention to is the dynamic monitoring of the air interface of the mobile communication network.

Contents of the invention

The technical problem to be solved by the present invention is to provide a monitoring system for the air interface of a mobile communication network, which can analyze the signaling of the uplink and downlink communication of the air interface of the mobile communication network through the combination of a software radio platform and a general computer.

In order to solve the above problems, the present invention is achieved through the following technical solutions:

A mobile communication network air interface monitoring system, comprising:

The signal collector receives the air interface signal, and selects narrowband sampling or wideband sampling to perform preliminary quantification on the air interface signal according to the channel configuration information of the cell to be monitored;

The signal processing unit, after receiving the preliminary quantified data, selects different digital signal processing functions to demodulate the preliminary quantified data according to the network type of the cell to be monitored, and outputs sub-channels of one or more physical channels. channel data;

The signaling analysis unit, after receiving the sub-channel data, selects the processing module in the program according to the network structure of the cell to be monitored, and after processing the sub-channel data, outputs the signaling report transmitted in the logical channel;

The system control unit controls and monitors the entire system locally or remotely.

The above-mentioned signal collector is preferably composed of a motherboard and a daughter board, wherein the motherboard receives the air interface signal, and the daughter board performs preliminary quantification on the air interface signal.

The working modes of the above-mentioned signal processing unit are: down-convert the demodulated signal to the sub-channel data of a physical channel; or obtain the sub-channel data of a physical channel by selective filtering on the demodulated signal; or The resulting signal is channelized and filtered to obtain sub-channel data of multiple physical channels.

In the above solution, the signaling analysis unit specifically includes the following functions:

According to the mapping relationship between the logical channel of the physical layer of the communication protocol and the physical channel, the received sub-channel data blocks are stored, reassembled and decoded to obtain the signaling in the broadcast channel;

According to the relevant specifications of the message in the signaling in the communication protocol, the system information of the cell to be monitored is obtained from the broadcast channel, and then the message in the system information of the cell to be monitored is analyzed to obtain the mapping structure of the logical channel of the cell to be monitored on the physical channel. The common control channel is reassembled and decoded downlink to obtain the signaling in the common control channel;

Analyze the message in the public control channel, filter out the immediate allocation command and store it, analyze it according to the immediate allocation command, obtain the allocation information of the dedicated control channel for this communication, and reassemble and decode the sub-channel data block according to the allocation information of the dedicated control channel , to obtain the signaling in the dedicated control channel;

Output the air interface signaling report of the cell.

In the above scheme, the system control unit specifically includes the following functions:

Automatically start the signal collector, signal processing unit and signaling analysis unit to search for cell signals in the environment, and analyze the cell information of each cell and the main frequency points of each cell and save them;

Output the searched cell and the main frequency point of the cell to the screen for the user to select the cell to be monitored;

After the user selects a cell, the system uses the saved cell information when scanning base stations as system configuration parameters, and restarts the signal collector, signal processing unit and signaling analysis unit to monitor the cell.

In the above solution, the system control unit further includes the following functions: when starting, firstly detect the system hardware part, and if the system has an unconnected error, the system control unit will output an error message.

Through the combination of the software radio platform and the general computer, the air interface signaling of the mobile communication network is analyzed, and the software radio technology is used to realize the fine-tuning and upgrading of the system only by modifying the program. More software-defined, the system can also be compatible with different mobile communication networks or next-generation networks. In this way, the service life of the system can be increased, and the system maintenance cost and the difficulty of system upgrade can be reduced at the same time. The use of software radio technology effectively reduces the system's dependence on hardware and the cost of equipment production.

Compared with prior art, the present invention has following characteristics:

1. Adopt general-purpose software wireless hardware electrical platform. When monitoring the target area, the signal acquisition of the motherboard sub-board structure can be adapted to different structural wireless communication networks by replacing the sub-board, or adopt a wider receiving bandwidth range. The sub-board realizes a system adapting to wireless communication networks with various structures.

2. Using the general software radio software platform, through different software algorithms, it can realize multi-channel narrowband sampling of multi-signal collectors connected in parallel with signal processing unit or multi-channel broadband sampling of single-signal collector and signal processing unit. The system structure is flexible.

3. According to the relevant specifications of channel allocation request and establishment in the mobile communication network protocol, the signaling analysis unit uses software to decode the signaling in the logical channel and output a report, which can better adapt to different mobile communication networks.

Description of drawings

Fig. 1 is a schematic structural diagram of a mobile communication network air interface monitoring system based on software radio technology.

Detailed ways

A mobile communication network air interface monitoring system based on software radio technology, as shown in Figure 1, is mainly composed of at least one signal collector, signal processing unit, signaling analysis unit and system control unit. Both the signal collector and the signal processing module are included in the general software radio platform. The signaling analysis unit and the system control unit can be local servers, headquarters or servers in the cloud. The output end of the signal collector is connected to the input end of the signal processing unit, the output end of the signal processing unit is connected to the input end of the signaling analysis unit, and the system control unit is connected to the signal processing unit and the signaling analysis unit.

When the mobile equipment device communicates wirelessly with the base station, access point or other mobile devices, the signal collector receives the air interface signal, and the system can select the narrowband sampling or broadband sampling method through the software according to the channel configuration information of the cell to be monitored. The signal processing unit configures the general software radio software platform according to the structure of the signal collector and the community to be monitored, selects different digital signal processing functions, demodulates the sampled signal, and outputs the sub-channel and channel information of one or more physical channels to the signal command parsing unit. The signal processing unit and the signaling analysis unit are connected through a computer network. After receiving the data sent by the signal processing unit, the signaling analysis unit can select the processing module in the program according to the network structure of the cell to be monitored, process the sub-channel data, and output the signaling report transmitted in the logical channel. The system control unit controls and monitors the entire system locally or remotely. When the system is started, the unit will detect the software and hardware of the system and feed back information through the human-computer interaction interface. After the system self-inspection is completed, the unit will Scan the wireless environment where the collector is located, and feed back the cell information through the human-computer interaction interface, and start the system through this unit to monitor the air interface of a certain cell.

Each unit of the system is further described in detail below:

The signal collector includes a motherboard and a daughter board, a connection between the daughter board and the antenna, to receive radio signals, and through software configuration, the daughter board down-converts the received radio signal to a configured frequency, and the motherboard processes the daughter board. After the final signal is quantized, the data processing center on the board performs digital signal processing on the signal, and the processed quantized data is sent to the signal processing unit through the data interface.

The signal processing unit receives the quantified data after preliminary digital signal processing, and selects different digital signal processing functions in the general software radio platform to quantify the quantized data according to the network type of the community to be monitored, through the setting of the software program. The signal undergoes digital signal processing. The signal processing unit can be divided into two working modes: the first one is to obtain the intermediate frequency signal after signal processing by the general software radio platform motherboard in the signal collector, and the broadband signal is processed by the signal processing unit and down-converted to a baseband signal of a physical channel; The second is to obtain broadband signals after signal processing by the general software radio platform motherboard in the signal collector, and the broadband signals are obtained by the signal processing unit using a selection filter or a channelization filter bank structure to obtain baseband signals of one or more physical channels .

The signaling analysis unit can be adapted through software adjustment according to the program of the data processing center configured by different mobile communication networks according to the change of the monitoring cell network. The signaling analysis unit performs the following processing:

First, according to the mapping relationship between the physical layer logic channel of the communication protocol and the physical channel, the received sub-channel data blocks are stored, reorganized and decoded to obtain the signaling in the broadcast channel;

Then, according to the relevant specifications of the message in the signaling in the communication protocol, the system information of the detected cell can be obtained from the broadcast channel. According to the analysis of the message in the cell system information, the mapping structure of the logical channel of the cell on the physical channel can be obtained. The control channel is reassembled and decoded downlink to obtain the signaling in the common control channel;

Secondly, analyze the message in the public control channel, filter out the immediate allocation command and store it, analyze it according to the immediate allocation command, and obtain the allocation information of the dedicated control channel for this communication, and perform sub-channel data blocks according to the allocation information of the dedicated control channel Recombination and decoding to obtain the signaling in the dedicated control channel;

Finally, output the cell air interface signaling report.

The system control unit serves as a dispatch control center during the operation of the entire system. The system control unit performs the following tasks:

First of all, when the system is started, the hardware part of the system is first detected. If the system has an error of not being connected, the system control unit will output an error message;

Then, the system control unit automatically starts the signal collector, the signal processing unit, and the signaling analysis unit to search for the cell signals in the environment where the system is located, and analyze the cell information of each cell and the main frequency points of each cell and save them;

Secondly, output the cell searched by the system and the main frequency point of the cell to the screen for the user to select the cell to be monitored;

Finally, after the user selects a cell, the system uses the saved cell information when scanning base stations as system configuration parameters, restarts the signal collector, signal processing unit, and signaling analysis unit to monitor the cell.

Although the present invention has been described in terms of specific embodiments, the specific embodiments and drawings are not intended to limit the invention. Those skilled in the art can make various modifications and improvements within the scope of the spirit of the present invention, but all should fall within the protection scope of the technical content disclosed in the present invention.

Claims (6)

1. The mobile communication network air interface monitoring system is characterized in that it includes: The signal collector receives the air interface signal, and selects narrowband sampling or wideband sampling to perform preliminary quantification on the air interface signal according to the channel configuration information of the cell to be monitored; The signal processing unit, after receiving the preliminary quantified data, selects different digital signal processing functions to demodulate the preliminary quantified data according to the network type of the cell to be monitored, and outputs sub-channels of one or more physical channels. channel data; The signaling analysis unit, after receiving the sub-channel data, selects the processing module in the program according to the network structure of the cell to be monitored, and after processing the sub-channel data, outputs the signaling report transmitted in the logical channel; The system control unit controls and monitors the entire system locally or remotely. 2. mobile communication network air interface monitoring system according to claim 1, it is characterized in that, described signal collector is made of mother board and daughter board, and wherein mother board receives air interface signal, daughter board carries out air interface signal preliminary quantification. 3. according to the mobile communication network air interface monitoring system described in claim 1 or 2, it is characterized in that, the mode of work of signal processing unit has: down-converting the demodulated signal to sub-channel data of a physical channel; Or use selective filtering on the demodulated signal to obtain sub-channel data of a physical channel; Or the demodulated signal is subjected to channelization filtering to obtain sub-channel data of multiple physical channels. 4. mobile communication network air interface monitoring system according to claim 1, is characterized in that, signaling analysis unit specifically comprises following function: According to the mapping relationship between the logical channel of the physical layer of the communication protocol and the physical channel, the received sub-channel data blocks are stored, reassembled and decoded to obtain the signaling in the broadcast channel; According to the relevant specifications of the message in the signaling in the communication protocol, the system information of the cell to be monitored is obtained from the broadcast channel, and then the message in the system information of the cell to be monitored is analyzed to obtain the mapping structure of the logical channel of the cell to be monitored on the physical channel. The common control channel is reassembled and decoded downlink to obtain the signaling in the common control channel; Analyze the message in the public control channel, filter out the immediate allocation command and store it, analyze it according to the immediate allocation command, obtain the allocation information of the dedicated control channel for this communication, and reassemble and decode the sub-channel data block according to the allocation information of the dedicated control channel , to obtain the signaling in the dedicated control channel; Output the air interface signaling report of the cell. 5. mobile communication network air interface monitoring system according to claim 1, is characterized in that, system control unit specifically comprises following function: Automatically start the signal collector, signal processing unit and signaling analysis unit to search for cell signals in the environment, and analyze the cell information of each cell and the main frequency points of each cell and save them; Output the searched cell and the main frequency point of the cell to the screen for the user to select the cell to be monitored; After the user selects a cell, the system uses the saved cell information when scanning base stations as system configuration parameters, and restarts the signal collector, signal processing unit and signaling analysis unit to monitor the cell. 6. mobile communication network air interface monitoring system according to claim 5, is characterized in that, system control unit also further comprises following function: When starting up, the hardware part of the system is first detected, and if the system has been disconnected, the system control unit will output an error message.