CN113938939B - Accurate concurrent positioning method and system for GSM terminal - Google Patents
Accurate concurrent positioning method and system for GSM terminal Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
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- H04W72/00—Local resource management
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The embodiment of the invention discloses a method and a system for precisely and concurrently positioning a GSM terminal, which are based on the application of a GSM mobile network same-frequency time division strategy, propose a scheme for mapping time slot resources and terminal behaviors, different mobile terminals can multiplex the same uplink frequency resource in time division, signal measurement is carried out on different uplink time slot windows by pre-configuring a multiframe time slot table of a mobile cell, and mark mapping is carried out on sampling data received at different windows and the terminal, so that the function of simultaneously measuring different terminal signals is realized. Based on the physical layer time slot mapping scheme, concurrent measurement of multi-terminal signals in the same mobile cellular cell can be realized, interference caused by frequency resource multiplexing does not exist in multi-terminal measurement in a target cell, so that a signal detection result is accurate, positioning precision is improved, positioning time is shortened, and effective evaluation and accurate searching of distances and positions of different terminals according to power calculation are supported.
Description
Technical Field
The embodiment of the invention relates to the technical field of mobile communication, in particular to a method and a system for precisely and concurrently positioning a GSM terminal.
Background
For the concurrent positioning of the GSM terminal, for the bypass detection mode, there is no effective solution temporarily, for the network-based positioning method, in the prior art, by applying the technology of monitoring the downlink parameter advance time TA by the wireless device, TA is the result obtained by the measurement of the base station, then the mobile terminal is informed to send data in advance for a period of Time (TA) by immediately assigning a message, so that the sent data just fall into the receiving window of the base station, the purpose of TA is to deduct the transmission delay between the base station and the mobile terminal, and because the distance between the base station and the terminal can be estimated by utilizing the TA parameter, the distance information between multiple terminals and the base station can be estimated by the concurrent detection of multiple TAs. Defects of the prior art: 1) Concurrent measurement and reporting of the multi-target terminal based on the bypass mode cannot be realized; 2) The concurrent searching of the abutting type multi-target terminal cannot be realized; 3) If the immediate assignment message is required to be monitored and intercepted, otherwise, the TA information cannot be obtained by decoding, and the distance cannot be estimated; 4) The positioning accuracy is low.
Disclosure of Invention
Therefore, the embodiment of the invention provides a method and a system for accurately and concurrently positioning a GSM terminal, which are used for solving the problems that the concurrent measurement and reporting of a multi-target terminal based on a bypass mode cannot be realized, the concurrent searching of a close-type multi-target terminal cannot be realized, the positioning precision is low and the like in the prior art.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
according to a first aspect of an embodiment of the present invention, a method for precisely and concurrently positioning a GSM terminal is provided, where the method includes:
pre-configuring an uplink multiframe time slot table of a mobile cell, wherein the uplink multiframe time slot table comprises mapping relations between different terminals in the cell and uplink time slots;
acquiring real-time sampling data of different uplink time slot window signals reported by a wireless detection device, performing time slot mapping on the acquired IQ data according to a preconfigured uplink multiframe time slot table, acquiring the IQ data of uplink time slots respectively corresponding to different terminals in a cell, and performing power calculation and concurrent positioning analysis of a plurality of terminals according to the acquired IQ data.
Further, before acquiring the real-time sampling data of different uplink time slot window signals reported by the wireless detection device, the method specifically further comprises:
configuring the working frequency of the wireless detection device as the downlink center frequency, so that the wireless detection device samples downlink signals of a mobile cellular cell working at the same frequency in real time by taking a time slot as a period, and reports acquired IQ data;
and detecting signal characteristics of the obtained downlink sampling data and completing time slot synchronization of the wireless detection device and the mobile cell.
Further, acquiring real-time sampling data of different uplink time slot window signals reported by the wireless detection device specifically includes:
triggering the wireless detection device to convert the downlink central frequency into the uplink central frequency, and performing time slot offset so that the wireless detection device samples the uplink signal of the terminal in real time by taking the time slot as a period after the working frequency is switched into the uplink central frequency, and reporting the acquired IQ data.
Further, the uplink multiframe time slot table designates the maximum uplink concurrency special control channel number, wherein the maximum uplink concurrency special control channel number comprises SDCCH and SACCH, the number of the SDCCH and the SACCH is consistent, the upper limit number in a single carrier frequency cell is 4, the uplink multiframe time slot table is fixed at a TS0 time slot, 51 multiframes comprise 51 TDMA frames, each TDMA frame comprises TS 0-TS 7 time slots, and different terminals correspondingly transmit signals on TS0 time slots of different TDMA frames.
Further, the signal characteristic detection is performed on the obtained downlink sampling data, and the time slot synchronization between the wireless detection device and the mobile cell is completed, which specifically comprises:
the method comprises the steps of receiving and detecting downlink BURST of different types in real time, firstly identifying FCCH BURST, after correctly identifying FCCH, attempting to decode SCH BURST of the same time slot of adjacent TDMA frames, wherein SCH BURST carries TDMA frame number and BSIC information, and after correctly decoding, performing time slot alignment mark to complete time slot synchronization of a wireless detection device and a mobile cell.
Further, triggering the wireless detection device to perform conversion from the downlink center frequency to the uplink center frequency, and performing slot offset, specifically including:
the uplink time SLOT reference is offset by 3 time SLOTs, i.e. uplink slot=downlink slot+3.
Further, acquiring real-time sampling data of different uplink time slot window signals reported by a wireless detection device, and performing time slot mapping on the acquired IQ data according to a preconfigured uplink multiframe time slot table to acquire IQ data of uplink time slots respectively corresponding to different terminals in a cell, wherein the method specifically comprises the following steps:
calculating and mapping the BURST received currently, accurately identifying the specific multiframe, TDMA frame and time slot position of each BURST, for the current SDCCH/4 configuration, the BURST received by TS1 to TS7 time slots is an invalid frame, mapping an uplink multiframe time slot table for the BURST received by TS0 time slots of TS0 time slots corresponding to different terminals, obtaining IQ data hitting the TS0 time slots corresponding to different terminals, respectively carrying out power calculation, and calculating the field intensity.
According to a second aspect of the embodiment of the present invention, a system for precisely and concurrently locating a GSM terminal is provided, where the system includes a wireless detection device as described in any one of the above and an upper computer connected to the wireless detection terminal, where the upper computer is installed with upper application software, where the upper application software is configured to execute the method as described in any one of the above.
The embodiment of the invention has the following advantages:
based on the application of GSM mobile network same-frequency time division strategy, a scheme of time slot resource and terminal behavior mapping is provided, because each mobile terminal in a connection state cannot generate time slot change in the whole life cycle of single connection, the assignment of the time slot is carried with notification by the response (immediate assignment) of the mobile cell to each initial channel request, namely, different mobile terminals can multiplex the same uplink frequency resource in time division, based on the characteristic, signal measurement is carried out on different uplink time slot windows by pre-configuring a multiframe time slot table of the mobile cell, and mark mapping is carried out on sampling data received at different windows and the terminal, thereby realizing the function of simultaneous measurement of different terminal signals. Based on the physical layer time slot mapping scheme, concurrent measurement of multi-terminal signals in the same mobile cellular cell can be realized, interference caused by frequency resource multiplexing does not exist in multi-terminal measurement in a target cell, so that a signal detection result is accurate, positioning precision is improved, positioning time is shortened, and effective evaluation and accurate searching of distances and positions of different terminals according to power calculation are supported.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
Fig. 1 is a flow chart of a method for precisely and concurrently positioning a GSM terminal according to embodiment 1 of the present invention;
fig. 2 is a table of uplink multiframe TS0 time slots configured by SDCCH/4 in the method for precisely and concurrently positioning a GSM terminal according to embodiment 1 of the present invention;
fig. 3 is a diagram illustrating an implementation process of a method for precisely and concurrently positioning a GSM terminal according to embodiment 1 of the present invention.
Detailed Description
Other advantages and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1, this embodiment proposes a method for accurately and concurrently positioning a GSM terminal, where the method includes:
s100, pre-configuring an uplink multiframe time slot table of the mobile cell, wherein the uplink multiframe time slot table comprises mapping relations between different terminals in the cell and uplink time slots.
The method solves the key technical difficulty that uplink mutual interference is realized and concurrent positioning is realized, a GSM mobile network bottom layer divides time slot, TDMA frame and multi-frame (26/51 TDMA frame) fine granularity time resource fragments by a physical layer, and distributes the time resource fragments to different mobile terminals to occupy uplink frequency resources in a time sharing way, and the designated window frequency resources are periodically applied to complete residence, service and other signaling transmission and interaction.
Based on the application of GSM mobile network same-frequency time division strategy, a scheme of mapping time slot resources and terminal behaviors is provided, because each mobile terminal in a connection state cannot generate time slot change in the whole life cycle of single connection, the assignment of the time slot is carried with notification by the response (immediate assignment) of the mobile cell to each initial channel request, namely, different mobile terminals can multiplex the same uplink frequency resources in time division, based on the characteristic, signal measurement is carried out on different uplink time slot windows by pre-configuring an uplink multiframe time slot table of the mobile cell, and the mark mapping is carried out on sampling data received at different windows and terminal behaviors by upper layer application, thereby realizing the function of simultaneous measurement of different terminal signals.
In this embodiment, the uplink multiframe timeslot table designates the maximum uplink concurrency dedicated control channel number, including SDCCH and SACCH, where the numbers of the two are consistent, the upper limit number in a single carrier frequency cell is 4 and fixed in a TS0 timeslot, as shown in fig. 2, the 51 multiframe includes 51 TDMA frames, each TDMA frame includes a TS 0-TS 7 timeslot, different terminals correspondingly transmit signals in the TS0 timeslots of different TDMA frames, and macroscopically, the signals are transmitted at different moments of the multiframe.
S200, acquiring real-time sampling data of different uplink time slot window signals reported by a wireless detection device, performing time slot mapping on the acquired IQ data according to a pre-configured uplink multiframe time slot table, acquiring the IQ data of uplink time slots respectively corresponding to different terminals in a cell, and performing power calculation and concurrent positioning analysis of a plurality of terminals according to the acquired IQ data.
The scheme mainly comprises a wireless detection hardware device and background application software, wherein the wireless detection hardware device is used for receiving and sampling wireless signals of an appointed cell, and the background software mainly completes functions of sampling data demodulation, protocol decoding, time slot mapping, power calculation, behavior marking and the like. The method mainly comprises two parts, wherein the first part is used for realizing downlink synchronization of cells affiliated to a target terminal and completing time slot alignment and frequency switching of a system, and the second part is used for realizing sampling measurement and time slot mapping of a terminal uplink frequency signal and finally completing mapping of time slot window power and the target terminal.
Further, before acquiring the real-time sampling data of different uplink time slot window signals reported by the wireless detection device, the method specifically further comprises:
configuring the working frequency of the wireless detection device as the downlink center frequency, so that the wireless detection device samples downlink signals of a mobile cellular cell working at the same frequency in real time by taking a time slot as a period, and reports acquired IQ data;
and detecting signal characteristics of the obtained downlink sampling data and completing time slot synchronization of the wireless detection device and the mobile cell.
The wireless detection device works at the appointed frequency through static configuration, the downlink signals of the mobile cells working at the same frequency are monitored in real time, the physical layer samples wireless signals by taking time slots as periods, sampled data are reported to the upper layer, and the upper layer detects signal characteristics to realize synchronization. The method specifically comprises the following steps: the method comprises the steps of receiving and detecting downlink BURST of different types in real time, firstly identifying FCCH BURST, after correctly identifying FCCH, attempting to decode SCH BURST of the same time slot of adjacent TDMA frames, wherein the SCH BURST carries TDMA frame number and BSIC information, and after correctly decoding, performing time slot alignment mark to complete time slot synchronization of a wireless detection device and a mobile cell. The synchronization with the downlink time slot of the cell and switching to uplink frequency monitoring ensures that the following power calculation can fall into the correct time slot, and the corresponding terminal is identified.
After synchronization is completed, the conversion from downlink to uplink frequency can be triggered, but the sampling period of the bottom layer is unchanged, the sampling behavior is not interrupted, the physical offset of the whole time slot can not occur after the reset frequency is switched to the uplink frequency through the period report of each group of sampling data, and the whole time slot is still in a synchronous state, but the asynchronous problem of a terminal transceiver refers to the downlink offset of the uplink time slot by 3 time slots according to the stipulation on a protocol, and the logic function of an uplink detection subsystem is started at the moment.
Further, acquiring real-time sampling data of different uplink time slot window signals reported by the wireless detection device specifically includes:
triggering the wireless detection device to convert the downlink central frequency into the uplink central frequency, and performing time slot offset so that the wireless detection device samples the uplink signal of the terminal in real time by taking the time slot as a period after the working frequency is switched into the uplink central frequency, and reporting the acquired IQ data. The time slot bias specifically includes:
the uplink time SLOT reference is offset by 3 time SLOTs, i.e. uplink slot=downlink slot+3.
Further, acquiring real-time sampling data of different uplink time slot window signals reported by a wireless detection device, and performing time slot mapping on the acquired IQ data according to a preconfigured uplink multiframe time slot table to acquire IQ data of uplink time slots respectively corresponding to different terminals in a cell, wherein the method specifically comprises the following steps:
calculating and mapping the BURST received currently, accurately identifying the specific multiframe, TDMA frame and time slot position of each BURST, for the current SDCCH/4 configuration, the BURST received by TS1 to TS7 time slots is an invalid frame, mapping an uplink multiframe time slot table for the BURST received by TS0 time slots of TS0 time slots corresponding to different terminals, obtaining IQ data hitting the TS0 time slots corresponding to different terminals, respectively carrying out power calculation, and calculating the field intensity. In this embodiment, the data detected in the time slot window is power calculated and the field intensity value is calculated when the data hit in d0\d1\d2\d3 or a0\a1\a2\a3 time slot, and the signal power is represented by the field intensity value. And carrying out IQ data calculation power on different time slot windows, and mapping different windows into different terminals through a configured multiframe time slot table. The method can store, mark and report the power of the memory area binding the time slot, and further comprehensively analyze and process the power information sets carrying different marks, thereby realizing the final application functions such as proximity positioning, physical position coordinate drawing and the like.
The physical layer of the uplink detection is consistent with the downlink function, continuous signal sampling is carried out for data submission, the upper layer continuously receives a data frame stream based on time slot window sampling, an uplink multiframe time slot table is applied for carrying out time slot mapping on different independent logic control and accompanying channels, wherein each type of control channel distributes different time slot resources for different concurrent service terminals, the time slot resources occupied by the connection before the service is finished are unchanged, and the control and accompanying channels mapped at different multiframe time domain positions can be associated and bound and measured based on the characteristics. For example, the initial connection of the terminal 1 is that a cell allocates SDCCH1 (multiframe time slot table is abbreviated as D1) as an independent control channel of the terminal, and other terminals are not occupied, all uplink signaling messages are sent on the channel in the whole service period, so that the subsystem performs power calculation on the sampled data received by the same type (SDCCH 1: 1) and resource number (SDCCH 1: SDCCH) logic channels based on the multiframe time slot table, and completes storage and display of the power corresponding to the SDCCH1, and performs procedure operation on the same type channels of other resource numbers, thereby completing synchronous measurement of uplink signals of concurrent multiple terminals, and realizing the concurrent positioning function of multiple terminals, as shown in fig. 3.
Example 2
Corresponding to the above embodiment 1, this embodiment proposes a precise concurrent positioning system for a GSM terminal, where the system includes any one of the above wireless detection devices and an upper computer connected to the wireless detection terminal, where the upper computer is installed with upper application software, where the upper application software is configured to execute any one of the above methods.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (5)
1. The method for accurately and concurrently positioning the GSM terminal is characterized by comprising the following steps:
pre-configuring an uplink multiframe time slot table of a mobile cell, wherein the uplink multiframe time slot table comprises mapping relations between different terminals in the cell and uplink time slots;
configuring the working frequency of the wireless detection device as the downlink center frequency, so that the wireless detection device samples downlink signals of a mobile cellular cell working at the same frequency in real time by taking a time slot as a period, and reports acquired IQ data;
performing signal characteristic detection on the obtained downlink sampling data and completing time slot synchronization of the wireless detection device and the mobile cell;
acquiring real-time sampling data of different uplink time slot window signals reported by a wireless detection device, carrying out time slot mapping on the acquired IQ data according to a preconfigured uplink multiframe time slot table, acquiring IQ data of uplink time slots respectively corresponding to different terminals in a cell, carrying out power calculation according to the acquired IQ data, carrying out power storage, marking and reporting on a storage area of a binding time slot, further carrying out comprehensive analysis and processing on a power information set carrying different marks, and carrying out concurrent positioning analysis of a plurality of terminals so as to realize concurrent positioning;
the uplink multiframe time slot table designates the maximum uplink special control channel number which comprises SDCCH and SACCH, wherein the number of the SDCCH and the SACCH is consistent, the upper limit number in a single carrier frequency cell is 4, the uplink multiframe time slot table is fixed in a TS0 time slot, 51 multiframes comprise 51 TDMA frames, each TDMA frame comprises TS 0-TS 7 time slots, and different terminals correspondingly transmit signals on the TS0 time slots of different TDMA frames;
the method specifically includes the steps of obtaining real-time sampling data of different uplink time slot window signals reported by a wireless detection device, performing time slot mapping on the obtained IQ data according to a preconfigured uplink multiframe time slot table, and obtaining the IQ data of an uplink time slot corresponding to a target terminal hit in a cell, wherein the method specifically includes the steps of:
and calculating and mapping the BURST received currently, accurately identifying the specific multiframe, TDMA frame and time slot position of each BURST, for the current SDCCH/4 configuration, enabling BURST received by TS1 to TS7 time slots to be invalid frames, mapping an uplink multiframe time slot table for BURST received by TS0 time slots, and obtaining IQ data hitting the TS0 time slots corresponding to the target terminals.
2. The method for precisely and concurrently positioning a GSM terminal according to claim 1, wherein the method for obtaining real-time sampling data of different uplink time slot window signals reported by the wireless detection device specifically comprises:
triggering the wireless detection device to convert the downlink central frequency into the uplink central frequency, and performing time slot offset so that the wireless detection device samples the uplink signal of the terminal in real time by taking the time slot as a period after the working frequency is switched into the uplink central frequency, and reporting the acquired IQ data.
3. The method for precisely and concurrently positioning a GSM terminal according to claim 1, wherein the step of performing signal feature detection on the obtained downlink sampled data and performing slot synchronization between the wireless detection device and the mobile cell comprises:
the method comprises the steps of receiving and detecting downlink BURST of different types in real time, firstly identifying FCCH BURST, after correctly identifying FCCH, attempting to decode SCH BURST of the same time slot of adjacent TDMA frames, wherein SCH BURST carries TDMA frame number and BSIC information, and after correctly decoding, performing time slot alignment mark to complete time slot synchronization of a wireless detection device and a mobile cell.
4. The method for precisely and concurrently positioning a GSM terminal according to claim 1, wherein the triggering the wireless detection device to perform the conversion from the downlink center frequency to the uplink center frequency, and performing the slot offset specifically comprises:
the uplink time SLOT reference is offset by 3 time SLOTs, i.e. uplink slot=downlink slot+3.
5. A GSM terminal accurate concurrency positioning system, characterized in that the system comprises a wireless detection device according to any one of claims 1-4 and an upper computer connected to the wireless detection device, wherein an upper application software is installed in the upper computer, and the upper application software is used for executing the method according to any one of claims 1-4.
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