CN115988553A

CN115988553A - Signal monitoring method and device and monitoring equipment

Info

Publication number: CN115988553A
Application number: CN202211657681.XA
Authority: CN
Inventors: 冯志勇; 黄赛; 郭冬倩; 张平; 昌硕; 应山川
Original assignee: Beijing University of Posts and Telecommunications
Current assignee: Beijing University of Posts and Telecommunications
Priority date: 2022-12-22
Filing date: 2022-12-22
Publication date: 2023-04-18

Abstract

The invention provides a signal monitoring method, a signal monitoring device and monitoring equipment, and relates to the technical field of mobile communication. The method comprises the following steps: determining user information of an uplink user in a target LTE cell according to a downlink signal of the target LTE cell, wherein the user information comprises: a cell radio network temporary identifier C-RNTI and uplink resource position information; acquiring uplink service data bits of a target user according to the uplink signal of the target LTE cell and the user information, wherein the target user is at least one of the uplink users; the downlink signal is acquired through an omnidirectional antenna, the uplink signal is acquired through a unidirectional antenna, and the unidirectional antenna is aligned to the direction of the target user. The scheme of the invention solves the problem that the prior art is difficult to provide user-level uplink air interface signal monitoring.

Description

Signal monitoring method and device and monitoring equipment

Technical Field

The present invention relates to the field of mobile communications technologies, and in particular, to a signal monitoring method, a signal monitoring device, and a monitoring apparatus.

Background

At present, the fourth generation mobile communication technology Long Term Evolution (LTE) is very mature, mobile communication services using the LTE technology as a carrier are also widely used, macro base stations and sub base stations deployed in an LTE system are distributed throughout the country, and the number of users and the data transmission amount are increased year by year. Meanwhile, LTE system monitoring means for the purpose of improving spectrum utilization efficiency and scientifically and comprehensively recognizing the use of the LTE system are also being developed. In the period, a large number of non-cooperative monitoring devices for evaluating the overall service condition of the LTE system in the cell from the dimensions of frequency band occupancy rate, resource element utilization rate and the like emerge, so that the supervision department has macroscopic cognition on the overall service condition of the LTE cell.

However, recently domestic telecommunication fraud frequently occurs, and some illegal persons use the LTE uplink voice service to conduct criminal activities. However, in the LTE system, the user-level resources are flexibly allocated and difficult to acquire, and it is difficult for the regulatory department to acquire data sent by a certain user from many user data in a cell and analyze and identify the data, so that it is difficult to attack the illegal activities wrapped in a legal shell, which means that the macro-cognition of the regulatory department on the cell cannot meet the present regulatory requirements, and the existing monitoring means cannot provide user-level uplink air interface signal monitoring and resource usage assessment.

Disclosure of Invention

The embodiment of the invention provides a signal monitoring method, a signal monitoring device and monitoring equipment, which are used for solving the problem that the prior art is difficult to provide user-level uplink air interface signal monitoring.

In order to solve the technical problem, the invention adopts the following technical scheme:

according to an aspect of the present invention, there is provided a signal monitoring method, including:

determining user information of an uplink user in a target LTE cell according to a downlink signal of the target LTE cell, wherein the user information comprises: cell Radio Network Temporary Identifier (C-RNTI) and uplink resource location information;

acquiring uplink service data bits of a target user according to the uplink signal of the target LTE cell and the user information, wherein the target user is at least one of the uplink users;

the downlink signal is acquired through an omnidirectional antenna, the uplink signal is acquired through a unidirectional antenna, and the unidirectional antenna is aligned to the direction of the target user.

In accordance with another aspect of the present invention, there is provided a signal monitoring apparatus comprising:

a first processing module, configured to determine user information of an uplink user in a target long term evolution LTE cell according to a downlink signal of the target LTE cell, where the user information includes: a cell radio network temporary identifier C-RNTI and uplink resource position information;

a second processing module, configured to obtain uplink service data bits of a target user according to the uplink signal of the target LTE cell and the user information, where the target user is at least one of the uplink users;

According to another aspect of the invention, there is provided a monitoring device comprising a memory, a processor and a computer program stored on the memory and executable on the processor; the processor, when executing the computer program, implements the signal monitoring method as described above.

According to another aspect of the present invention, there is provided a readable storage medium having stored thereon a program or instructions which, when executed by a processor, implement the steps in the signal monitoring method as described above.

The invention has the beneficial effects that:

according to the scheme, by utilizing the characteristics of different antennas, the downlink signal is selected to be acquired through the omnidirectional antenna, the uplink signal is selected to be acquired through the unidirectional antenna, the interference of other users on the uplink signal of the target user can be reduced, and the uplink resource position information of the uplink user in the target LTE cell is further determined according to the acquired downlink signal.

Drawings

Fig. 1 is a schematic flow chart of a signal monitoring method according to an embodiment of the present invention;

fig. 2 is a schematic flowchart illustrating a process of acquiring downlink common parameter information according to an embodiment of the present invention;

fig. 3 is a schematic flow chart of a Physical Downlink Control Channel (PDCCH) blind solution according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating a ratio of uplink subframes to downlink subframes of a TD-LTE system according to an embodiment of the present invention;

fig. 5 is a schematic flowchart illustrating uplink signal synchronization according to an embodiment of the present invention;

FIG. 6 is a schematic diagram illustrating a determination process of a valid user according to an embodiment of the present invention;

fig. 7 shows a schematic diagram of a PUSCH physical layer bit decoding flow according to an embodiment of the present invention;

fig. 8 is a schematic diagram illustrating an overall structure of a signal monitoring apparatus according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a signal monitoring device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

The invention provides a signal monitoring method, a device and monitoring equipment, aiming at the problem that the prior art is difficult to provide user-level uplink air interface signal monitoring.

As shown in fig. 1, an embodiment of the present invention provides a signal monitoring method, including:

step 101, determining user information of an uplink user in a target Long Term Evolution (LTE) cell according to a downlink signal of the target LTE cell, wherein the user information comprises: a cell radio network temporary identifier C-RNTI and uplink resource position information.

Here, the uplink user refers to a user transmitting an uplink signal.

102, obtaining uplink service data bits of a target user according to an uplink signal of the target LTE cell and the user information, where the target user is at least one of the uplink users; the downlink signal is acquired through an omnidirectional antenna, the uplink signal is acquired through a unidirectional antenna, and the unidirectional antenna is aligned to the direction of the target user.

As an optional embodiment of the present invention, when the signal monitoring method provided by the embodiment of the present invention is used for signal monitoring, the following specific settings may be set: unidirectional antenna, omnidirectional antenna, radio frequency receiver and upper computer program, etc. The unidirectional antenna can be connected with an A board card of the radio frequency receiver and used for receiving an uplink signal; the omnidirectional antenna can be connected with a B board card of the radio frequency receiver and used for receiving downlink signals; the radio frequency receiver and the upper computer program can be connected through a PCI-e interface. The upper computer program refers to a program for executing the signal monitoring method provided by the embodiment of the present invention.

It should be noted that, in the embodiment of the present invention, on one hand, the uplink acquisition port of the radio frequency receiver adopts the unidirectional antenna, and since the unidirectional antenna has the characteristic that the capability of receiving electromagnetic waves in a certain specific direction is very strong, and the capability of receiving electromagnetic waves in other directions approaches to zero, the interference of other users on the uplink signal of the target user can be reduced. On the other hand, the downlink acquisition port of the radio frequency receiver adopts the omnidirectional antenna, and the omnidirectional antenna has the characteristic of receiving signals in all directions, so that downlink synchronization can be obtained at any position in a cell. Therefore, the characteristics of different antennas can be utilized to ensure that the radio frequency receiver obtains downlink synchronization at any position in the cell, and the interference of other users on the uplink signals of the target user can be reduced.

In this embodiment, by using the characteristics of different antennas, the downlink signal is selected to be acquired through the omnidirectional antenna, and the uplink signal is acquired through the unidirectional antenna, so that interference of other users on the uplink signal of the target user can be reduced, and then the uplink resource location information of the uplink user in the target LTE cell is determined according to the acquired downlink signal.

Furthermore, the unidirectional antenna can be aligned to the direction of the target user, the uplink frequency point, the downlink frequency point and the acquisition gain of the target LTE cell are input in the upper computer software (if the network system corresponding to the target LTE cell is TD-LTE, only one frequency point is input), and the start button is clicked. The clock synchronization between the radio frequency receiver A board card and the radio frequency receiver B board card, the radio frequency daughter board collects signals (for example, the radio frequency receiver A board card collects uplink signals at a sampling rate of 30.72MHz through a one-way antenna, and the radio frequency receiver B board card collects downlink signals at a sampling rate of 30.72MHz through an antenna), and transmits the signals to an upper computer program.

Optionally, the determining, according to the downlink signal of the target long term evolution LTE cell, the user information of the uplink user in the target LTE cell includes:

acquiring the C-RNTI of the uplink user and Downlink Control Information (DCI) corresponding to the uplink user according to the Downlink signal;

determining DCI0 corresponding to the uplink user in the DCI;

and determining the uplink resource position information of the uplink user according to the DCI0 corresponding to the uplink user.

Here, after obtaining the user identifier (i.e. C-RNTI) and the DCI message in the current cell, the DCI0 message needs to be screened out. It should be noted that, according to the protocol, the DCI0 message has the characteristics that the first bit is 0 and the last two bits are idle bits. For the current public network LTE signal, the DCI0 message frequency hopping Indication bit is 0, and the starting and stopping range of the Resource Block (RB) calculated according to the Resource Indication Value (RIV) does not include four RBs at two ends of the frequency band. According to the characteristics of the DCI0 message, the uplink users in the cell and the DCI0 message thereof can be screened out, so that the number of the uplink users in the cell can be obtained, and the RB starting and ending positions of the resources allocated to each user in each uplink subframe can be calculated according to the RIV field in the DCI0 message, so that the uplink resource position information of the uplink users can be determined.

In the embodiment, the user identity (C-RNTI) of the current uplink of the cell and the position and the size of the allocated uplink PUSCH resource can be obtained, so that the number of the uplink users of the current cell and the initial knowledge of the service type of each uplink user can be obtained through statistics.

Optionally, the obtaining the C-RNTI of the uplink user and the downlink control information DCI corresponding to the uplink user according to the downlink signal includes:

decoding a downlink physical channel of the downlink signal to obtain downlink common parameter information corresponding to the target LTE cell;

and performing Physical Downlink Control Channel (PDCCH) blind search according to the downlink common parameter information to obtain the C-RNTI of the uplink user and the DCI corresponding to the uplink user.

It should be noted that, as shown in fig. 2, the downlink physical channel decoding may be performed on the downlink signal, and the process may specifically include: cell synchronization, orthogonal Frequency Division Multiplexing (OFDM) demodulation, channel estimation and equalization, physical Broadcast Channel (PBCH) decoding, physical Control Format Indicator Channel (PCFICH) decoding, common search space PDCCH decoding, and common search space Physical Downlink Shared Channel (PDSCH) decoding, so as to obtain Downlink common parameter information corresponding to the target LTE cell, where the Downlink common parameter information may specifically include at least one of the following: a Physical Cell Identifier (PCI), a Cyclic Prefix (CP) type, uplink subframe configuration Information, downlink subframe configuration Information, a Master Information Block (MIB), a System Information Block (SIB), the number of PDCCH symbols, and other Information.

In this embodiment, based on the downlink common parameter information obtained by decoding the downlink physical channel, a PDCCH blind search may be performed, so as to obtain the C-RNTI of the uplink user and the DCI corresponding to the uplink user.

Optionally, the downlink common parameter information includes: downlink subframe configuration information and the number of PDCCH symbols, wherein the performing physical downlink control channel PDCCH blind search according to the downlink common parameter information to obtain the C-RNTI of the uplink user and the DCI corresponding to the uplink user comprises:

determining at least one downlink subframe according to the downlink subframe configuration information;

and for each downlink subframe, decoding the downlink subframe according to the number of the PDCCH symbols and a first set, and determining the C-RNTI of the uplink user and the DCI corresponding to the uplink user, wherein the first set comprises at least one first C-RNTI to be verified.

For a target LTE cell of Frequency Division multiplexing Long Term Evolution (FDD-LTE), because a device applying the signal monitoring method belongs to non-cooperative third-party monitoring equipment and cannot acquire C-RNTI (radio network temporary identity) allocated to a user terminal by a base station when the user terminal is randomly accessed, 65535 possible C-RNTI values need to be traversed, and calculation of CCE (control channel element) initial positions corresponding to downlink subframes and decoding of PDCCH (physical downlink control channel) time-Frequency resource positions are carried out by combining at least one aggregation level type (such as

aggregation levels

1, 2, 4, 8 and the like), and finally whether DCI (Downlink control channel) information is successfully decoded is verified in a Cyclic redundancy check code (CRC) checking mode.

For a target LTE cell of Time Division Long Term Evolution (TD-LTE), the DCI decoding flow is slightly different. Taking the current LTE public network signal as an example, the matching types of the uplink subframe and the downlink subframe are shown in fig. 4, and it can be known according to the protocol that after a terminal detects a DCI0 message sent by a base station on a PDCCH channel, uplink PUSCH data is sent at the positions of the following four subframes, and only the 2 nd subframe and the 7 th subframe are uplink subframes, that is, only the 3 rd subframe and the 8 th subframe will have the DCI0 message. Therefore, when the DCI of the TD-LTE is decoded, only the PDCCH time-frequency resource positions in the 3 rd sub-frame and the 8 th sub-frame are extracted, and the rest steps are consistent with those in the FDD-LTE.

Optionally, the decoding, according to the number of PDCCH symbols and the first set, the downlink subframe to determine the C-RNTI of the uplink user and the DCI corresponding to the uplink user for each downlink subframe includes:

determining at least one first Control Channel Element (CCE) starting position corresponding to the downlink subframe by respectively using each first C-RNTI in the first set;

determining the PDCCH time-frequency resource position in the downlink subframe according to the initial position of each first CCE, the number of the PDCCH symbols and at least one aggregation level type;

decoding the PDCCH time-frequency resource position to obtain a decoding result;

and performing Cyclic Redundancy Check (CRC) on the decoding result, determining the decoding result passing the CRC as the DCI corresponding to the uplink user, and determining the first C-RNTI corresponding to the DCI as the C-RNTI of the uplink user.

The CCE starting position may be determined based on the C-RNTI, the cell number, the number of downlink RBs, and the like.

In this embodiment, the possible C-RNTI values (i.e., the C-RNTI values in the first set) need to be traversed to determine the CCE initial position corresponding to the downlink subframe, and then the PDCCH time-frequency resource position in the downlink subframe is determined in combination with the PDCCH symbol number and aggregation level type, so as to decode the PDCCH time-frequency resource position, and the DCI message is finally obtained through CRC check.

As an optional embodiment of the present invention, after determining that the decoding result passing the CRC check is the DCI corresponding to the uplink user, the method further includes:

storing a first C-RNTI corresponding to the DCI into a first subset, wherein the first subset is a proper subset of the first set; and when each first C-RNTI in the first set is used for determining at least one first CCE starting position corresponding to the downlink subframe, the first C-RNTIs in the first subset are preferentially used.

In this embodiment, as shown in fig. 3, in consideration of that a user, to which uplink resources are allocated, of a current subframe is more likely to continue to be allocated with resources in a subsequent subframe that is close to the current subframe, each time a DCI message is decoded successfully, a first C-RNTI corresponding to the DCI that is decoded successfully is stored in the first subset, so that the C-RNTI that is decoded successfully is marked by using the first subset, and then, when a new subframe is decoded each time, a C-RNTI value that is decoded successfully in the first subset can be tried preferentially, so that calculation of DCI that is not possible to be decoded successfully can be avoided in advance, the amount of calculation is reduced, and decoding efficiency is improved.

As an optional embodiment of the present invention, after determining that the decoding result passing the CRC check is the DCI corresponding to the uplink user, the method further includes at least one of:

storing a first CCE occupation position corresponding to the DCI to a first list;

and when the decoding of each downlink subframe is completed, emptying the first list.

Here, the first CCE occupying position corresponding to the DCI may be determined according to the first CCE starting position corresponding to the DCI and the number of PDCCH symbols.

In this embodiment, considering that in the same subframe, the CCE where the DCI that has passed the CRC check (i.e., the DCI that is successfully decoded) is located is not used by other DCIs, each time a DCI message is successfully decoded, the CCE occupied position corresponding to the DCI is stored in the first list, so that the CCE occupied by the DCI that is successfully decoded is marked by the first list, so that the CCE in the first list is no longer subjected to subsequent detection in the current subframe. In addition, the first list is cleared correspondingly every time decoding of one downlink subframe is completed. Therefore, the calculation of DCI which cannot be decoded successfully can be avoided in advance, the calculation amount is reduced, and the decoding efficiency is improved.

Optionally, the determining, according to each first CCE starting location, the number of PDCCH symbols, and at least one aggregation level type, a PDCCH time-frequency resource location in the downlink subframe includes:

determining a second CCE occupation position according to the first CCE starting position and the PDCCH symbol number;

judging whether the second CCE occupation position exists in the first list or not;

and under the condition that the second CCE occupation position does not exist in the first list, determining the PDCCH time-frequency resource position in the downlink subframe according to the second CCE occupation position and at least one aggregation level type.

In this embodiment, as shown in fig. 3, when determining the PDCCH time-frequency resource location in the downlink subframe, it is first determined whether the second CCE occupying location exists in the first list, and if not, the PDCCH time-frequency resource location in the downlink subframe is determined according to the second CCE occupying location and the at least one aggregation level type. Therefore, the calculation of DCI which is impossible to decode successfully can be avoided in advance, the calculation amount is reduced, and the decoding efficiency is improved.

Through the steps, the embodiment of the invention realizes that the PDCCH blind search is carried out to obtain the DCI message by marking CCE and C-RNTI under the condition of unknown RNTI, thereby effectively avoiding unnecessary calculation verification process and reducing time complexity.

It should be noted that, because the calculation and verification processes of different C-RNTIs are relatively independent, all C-RNTIs can be divided into a plurality of threads for parallel calculation, and CCE and C-RNTI flag values are transmitted by using inter-thread communication, thereby achieving the purpose of further decoding acceleration.

Optionally, the obtaining uplink service data bits of the target user according to the uplink signal of the target LTE cell and the user information includes:

acquiring uplink signal synchronization based on a timing algorithm of a Cyclic Prefix (CP);

determining the target user in the uplink user according to the uplink signal and the user information;

decoding a Physical Uplink Shared Channel (PUSCH) signal of the target user to obtain decoded data;

and performing CRC (cyclic redundancy check) on the decoded data, and determining the decoded data passing the CRC as the uplink service data bits of the target user.

As shown in fig. 7, by decoding PUSCH channel data (PUSCH signal) of the target user, uplink traffic data bits of the target user passing the CRC check can be acquired, and monitoring is completed. Since the number of bits of the PUSCH Channel Rank Indication (RI), the Channel Quality Indication (CQI), and the Acknowledgement (ACK) is unknown, after the decoded data is obtained, the bits are verified through CRC check, and the uplink service data bits of the target user are finally determined.

Optionally, the obtaining uplink signal synchronization by the cyclic prefix CP-based timing algorithm includes:

estimating a first range of the initial position of the head of the uplink subframe according to the initial position of the head of the downlink subframe;

extracting a first sequence and a second sequence of a target Orthogonal Frequency Division Multiplexing (OFDM) symbol aiming at each first time domain position in the first range, and respectively performing correlation operation on the first sequence and the second sequence to obtain a correlation result corresponding to the target OFDM symbol, wherein the target OFDM symbol comprises each OFDM symbol in an uplink subframe when the first time domain position is taken as the starting position of the head of the uplink subframe, the first sequence is positioned at the head of the target OFDM symbol, the second sequence is positioned at the tail of the target OFDM symbol, and the lengths of the first sequence and the second sequence are both equal to the length of a CP;

superposing at least one correlation result corresponding to the time domain position to obtain a first correlation peak value corresponding to the time domain position;

and determining the time domain position with the highest first correlation peak value as the starting position of the uplink subframe, and acquiring uplink signal synchronization according to the starting position of the uplink subframe.

It should be noted that, in the LTE system, the user terminal uses a Timing Advance (TA) issued by the base station in the random access to eliminate the transmission delay, and ensure that the time of the transmitted uplink data reaches the base station is aligned with the time of the base station. However, since the device using the signal monitoring method of the present application belongs to a third party monitoring device, the transmission delay between the device and the user terminal cannot be measured by the TA value, and the conventional method is not suitable.

In the embodiment of the invention, the uplink signal synchronization can be obtained based on the timing algorithm of the CP. Specifically, as shown in fig. 5, first, a first range of the start position of the header of the uplink subframe is estimated by using a known downlink synchronization position (i.e., the start position of the header of the downlink subframe), specifically, an OFDM symbol is estimated forward from the start position of the header of the downlink subframe (i.e., 2048+144=2192 points), and the range of the OFDM symbol is used as the first range of the start position of the header of the uplink subframe, that is, the header of the uplink subframe may appear at a certain position within the first range (i.e., a certain position in the "possible range of the header of the uplink subframe" in fig. 5); secondly, traversing each first time domain position (namely all possible starting positions of the head of the uplink sub-frame) in a first range in the uplink signal received by the radio frequency daughter board A of the receiver, extracting a first sequence and a second sequence of each OFDM symbol in 14 OFDM symbols of the uplink sub-frame aiming at each first time domain position in the first range, respectively carrying out correlation operation on the first sequence and the second sequence of each OFDM symbol to obtain a correlation result, and further superposing at least one correlation result corresponding to the time domain position to obtain a first correlation peak value corresponding to the time domain position; and finally, determining the time domain position with the highest correlation peak as the starting position of the uplink subframe, thereby obtaining uplink synchronization.

Through the above steps, uplink signal synchronization can be obtained by using the timing algorithm of the downlink synchronization position and the CP under the non-cooperative condition (in the case of unknown TA). The embodiment of the invention belongs to non-intrusive LTE air interface signal monitoring of a third party, can not influence public network users while acquiring user data, can not influence the use of detected equipment, is more beneficial to approaching uplink users to be detected, and can meet the daily monitoring requirements of a supervision department. The monitoring object of the signal monitoring method in the embodiment of the invention can comprise the uplink user which is sending data after establishing RRC connection, and the method can be suitable for searching the scene of the object which is carrying out illegal activities by utilizing the mobile communication network.

Optionally, the determining the target user in the uplink user according to the uplink signal and the user information includes: judging whether a first uplink user meets a first preset condition, wherein the first preset condition is that the average power of PUSCH data received by the first uplink user is larger than a preset multiple of noise power, the noise power is corresponding to an uplink subframe, and the first uplink user is at least one of the uplink users; and determining the target user according to the judgment result.

As an optional embodiment, the determining the target user according to the determination result includes at least one of:

if the first uplink user meets the first preset condition, determining the first uplink user as the target user;

and if the first uplink user does not meet the first preset condition, performing correlation peak detection on the first uplink user, and determining the first uplink user as the target user under the condition that the correlation peak detection is passed.

As shown in fig. 6, calculating the noise power of the current uplink subframe and the average power of the received PUSCH data of a certain user (i.e., a first uplink user), so as to determine whether the first uplink user meets a first preset condition, and if so, directly determining the first uplink user as a target user; if not, further judgment can be carried out according to the detection of the correlation peak; under the condition that the correlation peak detection is passed, determining the first uplink user as a target user, namely, determining the first uplink user as an effective user; and if the correlation peak detection is not passed, judging the first uplink user as an invalid user. Here, the process of determining the valid users may also be understood as determining which users are in the uplink receiving antenna path direction. In the above-mentioned judging process, the rough judgment is performed by energy (power) detection, and then the fine judgment is performed by correlation peak detection, wherein the correlation peak detection is not required for the data block with energy obviously higher than noise, so as to achieve the balance between the calculation complexity and the judgment accuracy.

Optionally, the performing correlation peak detection on the first uplink user includes:

acquiring a Demodulation Reference Signal (DMRS) sequence of the PUSCH of the first uplink user;

performing correlation operation on the DMRS sequence and the PUSCH signal of the first uplink user to obtain a second correlation peak value;

and determining that the detection of the correlation peak is passed in the case that the second correlation peak value is larger than a first threshold.

As shown in fig. 6, the DMRS sequence of the PUSCH of the first uplink user may be generated based on information such as the known C-RNTI and SIB2, and may be further correlated with the received PUSCH signal. Wherein the first threshold is dynamic.

Through the steps, the monitoring and data decoding of the uplink user of the LTE system can be realized by analyzing the interface signal in real time without the assistance of core network data.

As shown in fig. 8, as an alternative embodiment of the present invention, the upper computer program may specifically include the following modules:

and the downlink data processing module is mainly used for completing synchronization and demodulation of downlink signals and acquisition of basic parameters borne on a downlink channel, and comprises a DCI0 message obtained by blind decoding the PDCCH and a C-RNTI corresponding to the DCI0 message.

And the uplink signal judgment module is mainly used for completing uplink signal synchronization, judging the effectiveness of the uplink signal (namely determining a target user) according to the power and the related peak detection, and extracting effective uplink users and data in the cell.

And the uplink data processing module is used for carrying out bit decoding on the PUSCH on the user passing the judgment.

When the upper computer program runs, the upper computer program firstly enters a downlink data processing module, and the downlink data processing module processes downlink signals acquired by a board card of the radio frequency receiver B through a series of processes as shown in fig. 2, so that downlink common parameter information can be acquired. After entering the uplink signal judgment module, uplink signal synchronization is firstly carried out. And if the uplink signal judgment module judges that the user is valid, the uplink signal judgment module enters an uplink data processing module, the uplink data processing module decodes the PUSCH data of the user, and finally, the uplink service data bit of the target user passing the CRC check is obtained to complete monitoring.

In the embodiment of the invention, by utilizing the characteristics of different antennas, under a non-intervention mode, the LTE uplink signal and the LTE downlink signal are synchronously acquired by using double channels (the downlink signal is acquired by using an omnidirectional antenna, and the uplink signal is acquired by using a unidirectional antenna), so that the interference of other users on the uplink signal of a target user can be reduced, and data (the uplink signal and the downlink signal) can be acquired under a non-real-time condition, so that the uplink resource position information distributed for the uplink user by a base station in the downlink signal can be decoded under a non-cooperative condition, and the target user in the downlink signal can be extracted and further decoded and analyzed. Therefore, resources occupied by different uplink users can be finely and accurately divided, uplink service data bits of a target user are finally obtained, user-level uplink air interface signal monitoring and resource use condition evaluation are achieved, an LTE monitoring range is improved from cell level analysis to user level analysis, data acquisition and processing are separated, and effective observation of uplink user services can be achieved under the condition of limited detection terminal performance.

As shown in fig. 9, an embodiment of the present invention further provides a signal monitoring apparatus, including:

a first processing module 901, configured to determine, according to a downlink signal of a target long term evolution LTE cell, user information of an uplink user in the target LTE cell, where the user information includes: a cell radio network temporary identifier C-RNTI and uplink resource position information;

a second processing module 902, configured to obtain uplink service data bits of a target user according to the uplink signal of the target LTE cell and the user information, where the target user is at least one of the uplink users;

Optionally, the first processing module 901 includes:

the first processing submodule is used for acquiring the C-RNTI of the uplink user and downlink control information DCI corresponding to the uplink user according to the downlink signal;

a second processing sub-module, configured to determine, in the DCI, DCI0 corresponding to the uplink user;

and the third processing sub-module is configured to determine uplink resource location information of the uplink user according to the DCI0 corresponding to the uplink user.

Optionally, the first processing sub-module includes:

a decoding unit, configured to perform downlink physical channel decoding on the downlink signal to obtain downlink common parameter information corresponding to the target LTE cell;

and the searching unit is used for carrying out Physical Downlink Control Channel (PDCCH) blind search according to the downlink common parameter information to obtain the C-RNTI of the uplink user and the DCI corresponding to the uplink user.

Optionally, the downlink common parameter information includes: downlink subframe configuration information and the number of PDCCH symbols, wherein the search unit comprises:

a first processing subunit, configured to determine at least one downlink subframe according to the downlink subframe configuration information;

and the second processing subunit is configured to, for each downlink subframe, decode the downlink subframe according to the number of PDCCH symbols and the first set, and determine the C-RNTI of the uplink user and the DCI corresponding to the uplink user, where the first set includes at least one first C-RNTI to be verified.

Optionally, the second processing subunit includes:

a third processing subunit, configured to determine, by using each first C-RNTI in the first set, at least one first control channel element CCE starting position corresponding to the downlink subframe;

a fourth processing subunit, configured to determine, according to each first CCE starting location, the number of PDCCH symbols, and at least one aggregation level type, a PDCCH time-frequency resource location in the downlink subframe;

a fifth processing subunit, configured to decode the PDCCH time-frequency resource location to obtain a decoding result;

and the sixth processing subunit is configured to perform Cyclic Redundancy Check (CRC) check on the decoding result, determine the decoding result passing the CRC check as the DCI corresponding to the uplink user, and determine the first C-RNTI corresponding to the DCI as the C-RNTI of the uplink user.

Optionally, the apparatus further comprises:

a seventh processing subunit, configured to store the first C-RNTI corresponding to the DCI in a first subset, where the first subset is a proper subset of the first set;

and when determining at least one first CCE starting position corresponding to the downlink subframe by respectively using each first C-RNTI in the first set, preferentially using the first C-RNTI in the first subset.

Optionally, the apparatus further comprises:

an eighth processing subunit, configured to store the first CCE occupying position corresponding to the DCI in a first list;

a ninth processing subunit, configured to clear the first list when decoding of each downlink subframe is completed.

Optionally, the fourth processing subunit includes:

a tenth processing subunit, configured to determine, according to the first CCE starting location and the PDCCH symbol number, a second CCE occupation location;

an eleventh processing subunit, configured to determine whether the second CCE occupying position exists in the first list;

a twelfth processing subunit, configured to, when the second CCE occupying location does not exist in the first list, determine, according to the second CCE occupying location and at least one aggregation level type, a PDCCH time-frequency resource location in the downlink subframe.

Optionally, the second processing module 902 includes:

the fourth processing submodule is used for obtaining uplink signal synchronization based on a timing algorithm of a Cyclic Prefix (CP);

a fifth processing sub-module, configured to determine the target user in the uplink user according to the uplink signal and the user information;

a sixth processing submodule, configured to decode a physical uplink shared channel PUSCH signal of the target user, to obtain decoded data;

and the seventh processing submodule is used for performing CRC check on the decoded data and determining the decoded data passing the CRC check as the uplink service data bits of the target user.

Optionally, the fourth processing submodule includes:

a first estimation unit, configured to estimate a first range of an initial position of a head of an uplink subframe according to the initial position of the head of the downlink subframe;

a first processing unit, configured to extract, for each first time domain position in the first range, a first sequence and a second sequence of a target OFDM symbol, and perform a correlation operation on the first sequence and the second sequence, respectively, to obtain a correlation result corresponding to the target OFDM symbol, where the target OFDM symbol includes each OFDM symbol in an uplink subframe when the first time domain position is used as a start position of a header of the uplink subframe, the first sequence is located at a head of the target OFDM symbol, the second sequence is located at a tail of the target OFDM symbol, and lengths of the first sequence and the second sequence are both equal to a length of a CP;

a second processing unit, configured to superimpose at least one correlation result corresponding to the time-domain position to obtain a first correlation peak corresponding to the time-domain position;

and the third processing unit is used for determining the time domain position with the highest first correlation peak value as the starting position of the uplink subframe, and acquiring uplink signal synchronization according to the starting position of the uplink subframe.

Optionally, the fifth processing sub-module includes:

a fourth processing unit, configured to determine whether a first uplink user meets a first preset condition, where the first preset condition is that a received PUSCH data average power of the first uplink user is greater than a preset multiple of a noise power, the noise power is a noise power corresponding to an uplink subframe, and the first uplink user is at least one of the uplink users;

and the fifth processing unit is used for determining the target user according to the judgment result.

Optionally, the fifth processing unit includes:

a thirteenth processing subunit, configured to determine, if the first uplink user meets the first preset condition, the first uplink user as the target user;

a fourteenth processing subunit, configured to, if the first uplink user does not meet the first preset condition, perform correlation peak detection on the first uplink user, and determine the first uplink user as the target user when the correlation peak detection passes.

Optionally, the fourteenth processing subunit includes:

a fifteenth processing subunit, configured to acquire a demodulation reference signal DMRS sequence of a PUSCH of the first uplink user;

a sixteenth processing subunit, configured to perform correlation operation on the DMRS sequence and the PUSCH signal of the first uplink user to obtain a second correlation peak;

a seventeenth processing subunit, configured to determine that the correlation peak detection is passed if the second correlation peak value is greater than the first threshold.

It should be noted that, the signal monitoring apparatus provided in the embodiment of the present invention can implement all the method steps implemented by the signal monitoring method embodiment, and can achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.

The embodiment of the invention also provides monitoring equipment, which comprises a memory, a processor and a computer program which is stored on the memory and can be run on the processor; the processor, when executing the computer program, implements the signal monitoring method as described above.

Those skilled in the art will appreciate that all or part of the steps for implementing the above embodiments may be performed by hardware, or may be instructed to be performed by associated hardware by a computer program that includes instructions for performing some or all of the steps of the above methods; and the computer program may be stored in a readable storage medium, which may be any form of storage medium.

The readable storage medium of the embodiment of the present invention stores a program or an instruction thereon, and the program or the instruction when executed by the processor implements the steps in the signal monitoring method described above, and can achieve the same technical effects, and the details are not repeated here to avoid repetition. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

While the foregoing is directed to the preferred embodiment of the present invention, it will be appreciated by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method of signal monitoring, comprising:

determining user information of an uplink user in a target LTE cell according to a downlink signal of the target LTE cell, wherein the user information comprises: a cell radio network temporary identifier C-RNTI and uplink resource position information;

2. The method of claim 1, wherein the determining user information of uplink users in a target Long Term Evolution (LTE) cell according to downlink signals of the target LTE cell comprises:

determining DCI0 corresponding to the uplink user in the DCI;

3. The method according to claim 2, wherein the obtaining the C-RNTI of the uplink user and the downlink control information DCI corresponding to the uplink user according to the downlink signal comprises:

4. The method of claim 3, wherein the downlink common parameter information comprises: the downlink subframe configuration information and the number of PDCCH symbols, wherein the performing physical downlink control channel PDCCH blind search according to the downlink common parameter information to obtain the C-RNTI of the uplink user and the DCI corresponding to the uplink user comprises:

5. The method according to claim 4, wherein the decoding the downlink subframe according to the number of the PDCCH symbols and the first set for each downlink subframe, and determining the C-RNTI of the uplink user and the DCI corresponding to the uplink user, comprises:

determining at least one first Control Channel Element (CCE) starting position corresponding to the downlink subframe by using each first C-RNTI in the first set;

and performing Cyclic Redundancy Check (CRC) check on the decoding result, determining the decoding result passing the CRC check as the DCI corresponding to the uplink user, and determining the first C-RNTI corresponding to the DCI as the C-RNTI of the uplink user.

6. The method according to claim 5, wherein after determining the decoding result passing the CRC check as the DCI corresponding to the uplink user, the method further comprises:

storing a first C-RNTI corresponding to the DCI into a first subset, wherein the first subset is a proper subset of the first set;

7. The method according to claim 5, wherein after the determining the decoding result passing the CRC check as the DCI corresponding to the uplink user, the method further comprises at least one of:

and clearing the first list when the decoding of each downlink subframe is completed.

8. The method of claim 7, wherein the determining the position of the PDCCH time-frequency resource in the downlink subframe according to the starting position of each first CCE, the number of PDCCH symbols and at least one aggregation level type respectively comprises:

9. The method of claim 1, wherein the obtaining uplink service data bits of a target user according to the uplink signal of the target LTE cell and the user information comprises:

and performing CRC on the decoded data, and determining the decoded data passing the CRC as the uplink service data bits of the target user.

10. The method of claim 9, wherein the Cyclic Prefix (CP) -based timing algorithm for obtaining uplink signal synchronization comprises:

extracting a first sequence and a second sequence of a target Orthogonal Frequency Division Multiplexing (OFDM) symbol aiming at each first time domain position in the first range, and respectively performing correlation operation on the first sequence and the second sequence to obtain a correlation result corresponding to the target OFDM symbol, wherein the target OFDM symbol comprises each OFDM symbol in an uplink subframe when the first time domain position is taken as a head starting position of the uplink subframe, the first sequence is positioned at the head of the target OFDM symbol, the second sequence is positioned at the tail of the target OFDM symbol, and the lengths of the first sequence and the second sequence are both equal to the length of a CP;

11. The method of claim 9, wherein the determining the target user among the uplink users according to the uplink signal and the user information comprises:

judging whether a first uplink user meets a first preset condition, wherein the first preset condition is that the average power of PUSCH data received by the first uplink user is larger than a preset multiple of noise power, the noise power is corresponding to an uplink subframe, and the first uplink user is at least one of the uplink users;

and determining the target user according to the judgment result.

12. The method of claim 11, wherein the determining the target user according to the determination result comprises at least one of:

13. The method of claim 12, wherein the performing correlation peak detection on the first uplink user comprises:

acquiring a demodulation reference signal (DMRS) sequence of a PUSCH of the first uplink user;

14. A signal monitoring device, comprising:

the first processing module is configured to determine user information of an uplink user in a target long term evolution LTE cell according to a downlink signal of the target long term evolution LTE cell, where the user information includes: a cell radio network temporary identifier C-RNTI and uplink resource position information;

a second processing module, configured to obtain an uplink service data bit of a target user according to an uplink signal of the target LTE cell and the user information, where the target user is at least one of the uplink users;

15. A monitoring device comprising a memory, a processor and a computer program stored on the memory and executable on the processor; characterized in that the processor implements the signal monitoring method according to any one of claims 1 to 13 when executing the computer program.

16. A readable storage medium having a program or instructions stored thereon, wherein the program or instructions, when executed by a processor, implement the steps in the signal monitoring method according to any one of claims 1 to 13.