CN109168198B - Individual soldier uplink signal blind detection method for 4G detection and control - Google Patents
Individual soldier uplink signal blind detection method for 4G detection and control Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/11—Allocation or use of connection identifiers
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
- H04L1/0038—Blind format detection
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- H—ELECTRICITY
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- H04W24/00—Supervisory, monitoring or testing arrangements
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W76/19—Connection re-establishment
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- H—ELECTRICITY
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Abstract
The invention belongs to the technical field of mobile communication 4G, and discloses a blind detection method for uplink signals of individual soldiers for 4G detection and control.A target UE is adsorbed by positioning equipment, and then a cell frequency point and a Physical Cell Identifier (PCI) for adsorbing the target UE are set by a decoding individual soldier; the decoding individual soldier and the positioning equipment are synchronized in a downlink mode, a frame header is aligned, and a positioning process is started; the decoding individual soldiers respectively stay for the first time in multiple directions to carry out C-RNTI blind test, and a target C-RNTI is obtained; and the decoding individual soldier selects the direction with the maximum power measurement to advance, and the target UE is obtained. According to the invention, the decoding individual soldier obtains the target C-RNTI through an uplink signal blind detection method, so that a link between the positioning equipment and the individual soldier in the positioning system for monitoring in the prior art can be eliminated, and the problem of the decoding individual soldier in the prior art is solved.
Description
Technical Field
The invention relates to the field of mobile communication 4G, in particular to a blind detection method for an individual soldier uplink signal for 4G detection.
Background
In the prior art, a positioning system for monitoring and controlling is configured as shown in fig. 1, in order to locate a target UE (user equipment, terminal), a background of a public network base station is used to query a cell where the target UE resides in a public network and a coverage Area of the cell, a positioning person moves a positioning device to the queried range, then moves the positioning device from an edge to the inside of the queried range, the positioning device adsorbs the target UE, and after adsorbing the UE, the UE keeps online for a long time by periodically changing TAC (Tracking Area Code), and continuously issues uplink authorization, so that the UE continuously transmits uplink data, while a single soldier uses a directional antenna to continuously measure uplink signal intensity of the UE, when the directional antenna faces the UE, power is stronger than that in other directions, and according to the same location, the signal intensities of different orientations of the single soldier are different, and an operator controls the single soldier to approach to the target continuously, thereby achieving a positioning purpose.
Three types of individual soldiers currently exist as follows:
simulating an individual soldier: and measuring uplink full-bandwidth power. The problems that exist are that: when a large number of terminals reside in the public network around a single soldier, the power difference values in different directions are very small, and the target direction is difficult to judge.
(II) digital individual soldiers: the positioning vehicle reserves a fixed RB (Resource Block ) for the target UE, and the individual soldier measures the power in a narrow frequency range (namely the frequency range occupied by the RB), so that the influence of other frequencies on power measurement can be filtered, and the signal anti-interference capability is improved by reducing interference. The problems that exist are that: when a large number of terminals around an individual soldier reside in a public network, the terminals around the individual soldier still have a certain probability to send signals to the public network, the frequency points same as target UE are used, the directionality is improved to a certain extent compared with that of a simulated individual soldier, but the directionality is unstable, and the direction is difficult to distinguish in a large user scene.
And (III) decoding the individual soldier, namely reserving a fixed RB and a Modulation and Coding Scheme (MCS) for the target UE by the positioning vehicle, and sending a C-RNTI (CELL Radio Network temporary identity) to the individual soldier through a link ④ in fig. 1, so that the individual soldier can demodulate an uplink signal of the UE, when the uplink PUSCH (Physical uplink shared channel) signal of the target UE reaches the intensity of the individual soldier and the intensity of a peripheral interference signal are opposite, comparing the individual soldier towards the target UE and not towards the target UE, wherein the decoding success rate of the individual soldier is high due to a directional antenna, and at the moment, the direction of the target UE can be indicated by multiplying weighted values of all the demodulated signal intensities by a weighted value (a coefficient more than 1), so that the problems of a large-user multi-interference scene and individual-soldier directivity can be solved.
The disadvantages of decoding individual soldiers in the prior art include:
1) compared with digital individual soldiers and analog individual soldiers, the single soldier needs to pass through the link ④ in the figure 1, which means that a transmitting module is added on a positioning vehicle, and a receiving module is added at the end of the individual soldier, so that the hardware cost is increased;
2) meanwhile, the link ④ has a risk of chain scission in the positioning process, and if the C-RNTI of the UE is changed (link ② is reconstructed or disconnected) in the chain scission process, all uplink data individual soldiers cannot be correctly demodulated in the disconnection period, so that the advantages of the digital individual soldiers cannot be reflected;
3) since the decoding individual soldier needs to add a transmission module of the link ④ to the vehicle-mounted positioning equipment, the decoding individual soldier cannot be compatible in the aspect of hardware of the old positioning equipment.
Disclosure of Invention
In the prior art, the link between the positioning equipment and the decoding individual soldier causes hardware cost increase, the link has a link breaking risk, and the link causes the hardware equipment to have compatibility problem. The invention aims to provide a blind detection method of an uplink signal of an individual soldier for 4G detection and control, and solves the problems.
The embodiment of the application provides a 4G detection individual soldier uplink signal blind detection method, which comprises the following steps:
step f, after the target UE is adsorbed by the positioning equipment, decoding a cell frequency point and a Physical Cell Identifier (PCI) which are set by an individual soldier and adsorb the target UE; the decoding individual soldier and the positioning equipment are synchronized in a downlink mode, a frame header is aligned, and a positioning process is started; the decoding individual soldiers respectively stay for the first time in multiple directions to carry out C-RNTI blind test, and a target C-RNTI is obtained; and the decoding individual soldier selects the direction with the maximum power measurement to advance, and the target UE is obtained.
Preferably, the blind detection of the C-RNTI in the step f includes the following steps:
step 2.1, the decoding individual soldier sets X ═ RNTIiniWhere X is a temporary variable, RNTIiniDistributing a minimum value for the RNTI, wherein i is the uplink continuous solution pair times;
2.2, the decoding individual soldier schedules TTI on each uplink, and demodulates the uplink data by taking X as a C-RNTI value;
step 2.3, judging whether the uplink data can be correctly demodulated by using the X; if not, entering the step 2.4; if yes, entering step 2.5;
step 2.4, judging whether X +1 is larger than RNTI or notendWherein, RNTIendAllocating a maximum value for the RNTI; if yes, returning to the step 2.1; if not, then X ═ X +1, and return to step 2.2;
step 2.5, i is i +1, and whether i is smaller than m is judged, wherein m is an uplink continuous solution pair number threshold; if yes, returning to the step 2.2; if not, the RNTI is X, and the target C-RNTI value is X.
Preferably, the step f further comprises: and in the positioning process, detecting whether the target UE is disconnected and reconnected, and if so, re-executing the C-RNTI blind test.
Preferably, the detecting whether the target UE is disconnected and reconnected includes the following steps:
step 4.1, after the C-RNTI value is successfully detected, setting j to 0, wherein j is the uplink continuous error-solving frequency; the decoding individual soldier uses the C-RNTI to demodulate the uplink data in each uplink scheduling TTI;
step 4.2, judging whether the uplink data can be correctly demodulated by using the C-RNTI or not; if yes, returning to the step 4.1; if not, j is j +1, and go to step 4.3;
4.3, judging whether j is smaller than n, wherein n is an uplink continuous error-solving frequency threshold value; if yes, returning to the step 4.2; and if not, the target UE is considered to be disconnected and reconnected.
Preferably, before step f, the method further comprises:
step a, the positioning equipment sends a short message to the target UE, and the target UE establishes RRC connection;
b, inquiring a cell where the target UE resides and a cell geographic coverage range through a background of a public network base station;
c, the positioning equipment travels to the geographic coverage area of the cell to establish a common-frequency cell;
d, the positioning equipment moves in the geographic coverage area of the cell, so that the target UE reselects the same-frequency cell established by the positioning equipment;
and e, the target UE initiates a tracking area update TAU.
Preferably, in the step e, the initiating, by the target UE, a tracking area update TAU includes: establishing RRC connection and carrying out identity inquiry; setting a C-RNTI distribution range in the RRC connection establishment; and distinguishing the target UE and the non-target UE through the query result in the identity query.
Preferably, the C-RNTI distribution range is [ RNTIini，RNTIend]Wherein, RNTIend-RNTIini>150。
Preferably, for the non-target UE, the positioning device sends a tracking area reject message and an RRC release message; for the target UE, the positioning equipment transmits DCI0 information, and the position numbers of MCS and RB in the DCI0 information are fixed.
Preferably, in the step f, after the target UE is adsorbed by the positioning device, for TDD, the decoding individual soldier further sets an uplink ratio for adsorbing the target UE.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
in the embodiment of the application, compared with the method that the positioning equipment sends the cell radio network temporary identifier C-RNTI to the decoding individual soldier through the link in the prior art, the decoding individual soldier obtains the target C-RNTI through the uplink signal blind detection method, so that the link between the positioning equipment and the individual soldier in the positioning system for monitoring and control in the prior art can be removed, and the problem of the decoding individual soldier in the prior art is solved. The invention solves the defects of decoding individual soldiers in the prior art on the premise of not influencing the directivity of the decoding individual soldiers, is particularly suitable for 4G monitoring and control, can ensure the support of national public security battleline work, effectively protects the benefits of people, avoids great economic loss and has important application value.
Drawings
In order to more clearly illustrate the technical solution in the present embodiment, the drawings needed to be used in the description of the embodiment will be briefly introduced below, and it is obvious that the drawings in the following description are one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art positioning system for detection and control;
fig. 2 is a flowchart of C-RNTI blind detection in the individual soldier uplink signal blind detection method for 4G detection provided by the embodiment of the invention;
fig. 3 is a flowchart of the adsorption in the blind detection method for the uplink signal of the individual soldier for 4G detection provided by the embodiment of the invention.
Fig. 4 is a flowchart for determining C-RNTI failure in the individual soldier uplink signal blind detection method for 4G detection provided by the embodiment of the invention.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
The invention provides a specific principle realization process for positioning the position of target UE when the positioning equipment does not acquire the security context of the target UE, which comprises the following steps:
a. the positioning equipment sends a short message to the target UE, and the target UE establishes RRC connection;
b. a positioning person inquires a cell where target UE resides and a cell geographic coverage range through a background of a public network base station;
c. positioning personnel move positioning equipment (vehicle-mounted) to a cell coverage area and establish a common-frequency cell (the positioning equipment TAC is different from a public network);
d. the method comprises the steps that vehicle-mounted equipment is enabled to move within a cell range, and when the vehicle-mounted equipment is moved to a positioning equipment cell, a target UE can reselect to a cell established by the positioning equipment, TAC (cell identity) possibly used by a public network can be obtained from a public network background, the TAC of the positioning equipment must not be in a TAI list (tracking area list) of the public network, namely the TAC of the positioning equipment is inconsistent with all TACs of the public network, if the TAC of the public network is in the TAI list of the public network, the target UE cannot initiate connection at idle, uplink data authorization cannot be fixed (step ⑥ in figure 3), and a user cannot be positioned;
e.ue initiates TAU (Tracking Area Update) flow as shown in fig. 3, steps ① - ⑤, which is consistent for all UEs, wherein ① - ③ are RRC (Radio Resource Control) connection establishment procedures, which include random access procedures, in order to retrieve correct C-RNTI in the subsequent blind detection procedure, the C-RNTI allocation amount needs to be limited, because the time from the whole access of non-target UEs to the release procedure is shortWithin 150ms, the C-RNTI allocation range can be limited to [ RNTIini，RNTIend]Wherein RNTIend-RNTIini>④⑤ is an identity query process, the target UE and the non-target UE are distinguished by the query result, for the target UE and the non-target UE, the former 5 steps are consistent, for the non-target UE, the positioning equipment sends TAU reject message and RRC release message, for the target UE, the flow is as shown in figure 3, DCI0 is issued without stop, and the MCS and RB position number in the DCI0 are fixed;
f. after the target UE is adsorbed by the positioning equipment, setting a frequency point and a PCI for adsorbing a target UE cell on an individual soldier, performing uplink proportioning (only TDD is needed), then performing downlink synchronization with the positioning equipment, aligning a frame header, starting a positioning process, after getting off the vehicle, staying in 4 directions, namely front, back, left and right, each direction for at least 1s, and walking in the direction with the maximum power measurement until a target is found; the reason for staying more than 1s in each direction is that the blind detection scheme herein is time-division blind detection, i.e., 1C-RNTI is detected per uplink TTI (transmission time interval) until the correct C-RNTI is found. In the LTE system, each TTI1ms has 1000 TTIs in 1s, 1000 different C-RNTIs can be tried in FDD, and TDD takes the 2:7 ratio of a public network as an example, 200 different C-RNTIs can be tried, all the C-RNTIs can be polled for 1 time, and the correct C-RNTI can be found under the condition of the least ideal condition. The C-RNTI blind detection flow is as shown in figure 2:
① setting PCI for each individual soldier, finishing frequency point, working formally, and taking temporary variable X as RNTIiniI is 1, RNTIiniAnd allocating a minimum value for the RNTI, wherein i is the uplink continuous solution pair times.
② individual soldiers use the same MCS and RB position number information as DCI0 in step ⑥ of FIG. 3 at known uplink frequency points, known PCI, and as C-RNTI value to demodulate uplink data at each uplink scheduling TTI.
③ if not, then determine if X +1 is greater than RNTIend，RNTIendAssigning a maximum value to the RNTI, and if so, proceeding from step ①And restarting, if not, then X +1, i1, and restarting step ②.
④, if the demodulation can be correctly carried out, i is i +1, if i is less than m, step ②③ is restarted, if i is m, the RNTI is considered to be X, namely the C-RNTI value is X, the uplink data can be correctly demodulated by continuous m uplink TTIs, and the target C-RNTI is found, wherein m is an uplink continuous solution frequency threshold value, namely m uplink continuous solution pairs are reached, the current RNTI is the target RNTI, m is the value of the target RNTI, which is to avoid accidental C-RNTI error, but the false detection is correct, and the m value is set to be more than or equal to 2 because the probability of the continuous m false detections is very small.
In the positioning process, the target UE may be disconnected and reconnected, after the disconnection and reconnection, the C-RNTI is changed, an individual soldier needs to blindly check the C-RNTI again, and the process of detecting the change of the C-RNTI is as shown in FIG. 4:
①, after confirming the C-RNTI value, the individual soldier uses the information of the known uplink frequency point, the known PCI and the MCS and RB position quantity which are the same as the DCI0 in the ⑥ step of the figure 3 to demodulate the uplink data in each uplink scheduling TTI;
②, if the demodulation is successful, j is 0, go on to step ①, j is the number of continuous uplink error-solving times;
③ if it can not demodulate successfully, j equals to j +1, then judges the magnitude of j and n, if j < n, repeats steps ① - ③, n is the threshold of up continuous error-resolving times;
④ if j is equal to n (the value of n depends on the number of uplink TTIs included in the time required by one-man scanning for one week), that is, n times of uplink continuous error decoding are achieved, the target RNTI is modified, the C-RNTI is considered to be changed, the C-RNTI needs to be blindly checked again, and the step in FIG. 2 is started.
By combining the two processes, a single soldier can correctly and blindly detect the target uplink signal and restore uplink signal demodulation after disconnection and reconnection.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. A4G individual soldier uplink signal blind detection method for detection and control is characterized by comprising the following steps:
step f, after the target UE is adsorbed by the positioning equipment, decoding a cell frequency point and a Physical Cell Identifier (PCI) which are set by an individual soldier and adsorb the target UE; the decoding individual soldier and the positioning equipment are synchronized in a downlink mode, a frame header is aligned, and a positioning process is started; the decoding individual soldiers respectively stay for the first time in multiple directions to carry out C-RNTI blind test, and a target C-RNTI is obtained; the decoding individual soldier selects the direction with the largest power measurement to travel to obtain the target UE;
the C-RNTI blind detection comprises the following steps:
step 2.1, the decoding individual soldier sets X ═ RNTIiniWhere X is a temporary variable, RNTIiniDistributing a minimum value for the RNTI, wherein i is the uplink continuous solution pair times;
2.2, the decoding individual soldier schedules TTI on each uplink, and demodulates the uplink data by taking X as a C-RNTI value;
step 2.3, judging whether the uplink data can be correctly demodulated by using the X; if not, entering the step 2.4; if yes, entering step 2.5;
step 2.4, judging whether X +1 is larger than RNTI or notendWherein, RNTIendAllocating a maximum value for the RNTI; if yes, returning to the step 2.1; if not, then X ═ X +1, and return to step 2.2;
step 2.5, i is i +1, and whether i is smaller than m is judged, wherein m is an uplink continuous solution pair number threshold; if yes, returning to the step 2.2; if not, the RNTI is X, and the target C-RNTI value is X.
2. The blind detection method for the uplink signal of the individual soldier for 4G detection and control according to claim 1, wherein the step f further comprises the following steps: and in the positioning process, detecting whether the target UE is disconnected and reconnected, and if so, re-executing the C-RNTI blind test.
3. The blind detection method for uplink signals of individual soldiers in 4G surveillance according to claim 2, wherein the step of detecting whether the target UE is disconnected and reconnected comprises the following steps:
step 4.1, after the C-RNTI value is successfully detected, setting j to 0, wherein j is the uplink continuous error-solving frequency; the decoding individual soldier uses the C-RNTI to demodulate the uplink data in each uplink scheduling TTI;
step 4.2, judging whether the uplink data can be correctly demodulated by using the C-RNTI or not; if yes, returning to the step 4.1; if not, j is j +1, and go to step 4.3;
4.3, judging whether j is smaller than n, wherein n is an uplink continuous error-solving frequency threshold value; if yes, returning to the step 4.2; and if not, the target UE is considered to be disconnected and reconnected.
4. The blind detection method for the uplink signal of the individual soldier for 4G detection and control according to claim 1, wherein before the step f, the method further comprises the following steps:
step a, the positioning equipment sends a short message to the target UE, and the target UE establishes RRC connection;
b, inquiring a cell where the target UE resides and a cell geographic coverage range through a background of a public network base station;
c, the positioning equipment travels to the geographic coverage area of the cell to establish a common-frequency cell;
d, the positioning equipment moves in the geographic coverage area of the cell, so that the target UE reselects the same-frequency cell established by the positioning equipment;
and e, the target UE initiates a tracking area update TAU.
5. The individual soldier uplink signal blind detection method according to claim 4, wherein in the step e, the target UE initiating a tracking area update TAU comprises: establishing RRC connection and carrying out identity inquiry; setting a C-RNTI distribution range in the RRC connection establishment; and distinguishing the target UE and the non-target UE through the query result in the identity query.
6. The individual soldier uplink signal blind detection method for 4G detection and control according to claim 5, wherein the C-RNTI is allocated within a range of [ RNTIini，RNTIend]Wherein, RNTIend-RNTIini>150。
7. The blind detection method for uplink signals of individual soldiers for 4G detection and control according to claim 5, wherein for the non-target UE, the positioning device sends a tracking area rejection message and an RRC release message; for the target UE, the positioning equipment transmits DCI0 information, and the position numbers of MCS and RB in the DCI0 information are fixed.
8. The blind detection method for uplink signals of individual soldiers for 4G detection and control according to claim 1, wherein in the step f, after the target UE is adsorbed by the positioning equipment, the decoding individual soldier further sets an uplink ratio for adsorbing the target UE for TDD.
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Address after: 430205 Hubei city of Wuhan province Jiangxia Hidden Dragon Island Tan lake two Road No. 1 Patentee after: CITIC Mobile Communication Technology Co., Ltd Address before: 430073 Hubei province Wuhan Dongxin East Lake high tech Development Zone, Road No. 5 Patentee before: Wuhan Hongxin Telecommunication Technologies Co.,Ltd. |
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Address after: 430205 No.1 tanhu 2nd Road, Canglong Island, Jiangxia District, Wuhan City, Hubei Province Patentee after: CITIC Mobile Communication Technology Co.,Ltd. Address before: 430205 No.1 tanhu 2nd Road, Canglong Island, Jiangxia District, Wuhan City, Hubei Province Patentee before: CITIC Mobile Communication Technology Co., Ltd |