CN101521901A - Method, system and equipment for detecting blind areas - Google Patents

Abstract

The invention discloses a method for detecting a blind area, which includes the following steps: a user terminal records detection information within a preset time, the information includes the identity of the serving base station, and the information may also include neighbor related information and/or the user The last positioning information of the terminal; the user terminal moves out of the blind zone, and obtains the current blind zone information according to the measurement information detected when reacquiring the signal; after the user terminal is confirmed by the base station, it reports the obtained blind zone information to the network side, Make the network side obtain the position of the blind area. The invention discloses a system and equipment for detecting blind areas. The present invention realizes blind area location positioning through user feedback, and provides an information reference for subsequent network operators to deploy base stations, eliminating the need for the operator to perform a drive test to determine the blind area, saving the cost of the operator, and ensuring network security. full coverage problem.

Description

A method, system and device for detecting blind spots

technical field

The present invention relates to the field of communication technology, in particular to a method, system and equipment for detecting blind spots.

Background technique

During the operation of the network, such as base station hardware failures and transmission problems often occur, which can be discovered through network operation and maintenance equipment, and solutions can be found. However, some problems such as uplink and downlink interference and unreasonable coverage that do not cause serious call drop are difficult to be found in statistics, and these problems are the most closely and directly related to users. For this, it should be based on the collected Data, through the analysis to make accurate judgments on network problems, and at the same time, based on the test results, propose adjustment plans for the improvement or optimization of the problems. In the prior art, the above functions can be realized through a drive test device.

Drive test equipment is software and hardware equipment specially produced for network optimization and planning, including data acquisition front-end, Global Positioning System (Global Positioning System, Global Positioning System) and special test software. The current data acquisition front-end is mostly a test mobile phone with special software inside, which can rely on the network to complete some special functions, such as frequency locking, forced switching, displaying network information to determine the network busy area, etc.; also can complete some functions without relying on the network, such as full Frequency band scanning and frequency point scanning, etc.; at the same time, it can also receive instructions from the computer through the communication cable between the computer and the mobile phone, and transmit the collected data to the computer for further processing.

However, using the drive test method to detect blind spots requires human intervention, which is relatively expensive and expensive, and does not meet the needs of service operators for network costs. In addition, when the drive test is carried out, the call drop phenomenon is often serious, and has already caused a great impact on users, and the coverage problem cannot be solved in time. Furthermore, not all places are suitable for the road test method, so the road test method is subject to certain geographical limitations.

Aiming at the above-mentioned problems of the drive test technology, another blind spot detection method is proposed in the prior art, and the MS (Mobile Station, mobile station) reports the measurement information; or in the active state, the MS does not need to provide the measurement information, and the network records the terminal The whereabouts, information collection for special status, where the special status includes: the cell loses coverage; or reselects a cell; or initiates a service in an idle state and finds that coverage is lost.

However, although this existing technical solution provides a detection report of the coverage area, it does not take into account the current load of the reported cell or the accumulated situation of the report. As long as there is blind area information, it will be reported, which will eventually affect the reporting of other user services in the cell. In severe cases, it may lead to serious consequences such as paralysis of the community.

Contents of the invention

The embodiment of the present invention provides a method, system and equipment for detecting blind spots. The blind spot is positioned through the detection function of the user terminal and related blind spot detection is performed in a reporting manner, so as to realize the blind spot detection work more effectively and at low cost. ; and avoid delaying reporting or rejecting user reports under heavy load conditions.

An embodiment of the present invention provides a method for detecting blind spots, including the following steps:

The user terminal records the detection information within a preset time, and the information includes the identity of the serving base station,

The user terminal moves out of the blind area, and obtains the current blind area information according to the measurement information detected when reacquiring the signal;

After being confirmed by the base station, the user terminal reports the obtained blind area information to the network side, so that the network side obtains the position of the blind area.

An embodiment of the present invention provides a system for detecting blind spots, including:

The user terminal is used to record the detection information within the preset time, and the information includes the identity of the serving base station; if it moves out of the blind area, obtain the current blind area information according to the measurement information detected when the signal is reacquired; and after confirmation by the network side equipment , reporting the obtained blind area information to the network side, so that the network side acquires the position of the blind area;

The network-side device is configured to perform blind area statistics and position calculation according to received confirmed user terminal report information, and obtain the position information of the blind area.

An embodiment of the present invention provides a user terminal, including:

A blind spot detection unit, configured to determine whether the user terminal enters a blind spot or moves out of a blind spot;

The information acquisition and buffering unit is used to record the detection information within a preset time, and the information includes the identification of the serving base station; if the blind area is moved out, the current blind area information is obtained according to the measurement information detected when the signal is reacquired;

The information reporting unit is configured to report the obtained blind area information to the network side after obtaining confirmation from the network side device, so that the network side obtains the position of the blind area.

An embodiment of the present invention provides a network side device, including:

a report information receiving unit, configured to receive the report information sent by the user terminal;

The position calculation unit is used to perform blind area statistics and position calculation according to the received user terminal report information, and obtain the position information of the blind area;

A judging unit, configured to judge whether it is necessary to report blind spot detection information, and if not, perform normal communication; if necessary, send a blind spot detection information reporting request message to the user terminal, the message carries relevant content and allocates resources for reporting the message Location.

In the embodiment of the present invention, the location of the blind area is realized through the user's feedback, and an information reference is provided for the subsequent network operator to deploy the base station, eliminating the need for the operator to perform a drive test to determine the blind area, saving the operator's time The cost ensures the full coverage of the network. And avoid delaying reporting or rejecting user reports under heavy load conditions.

Description of drawings

FIG. 1 is a schematic diagram of scene 1 in which a terminal assists in detecting blind spots in an embodiment of the present invention;

FIG. 2 is a schematic diagram of scene 2 in which a terminal assists in detecting blind spots in an embodiment of the present invention;

FIG. 3 is a flow chart of terminal-assisted blind spot detection in an embodiment of the present invention;

FIG. 4 is a flow chart of MS-assisted blind spot detection in the presence of GPS/OTDOA in Embodiment 1 of the present invention;

Fig. 5 is the flow chart of the CELL_ID positioning method centered on the RNC in the embodiment of the present invention;

Fig. 6 is a flow chart of a CELL_ID positioning method centered on SAS in an embodiment of the present invention;

Fig. 7 is the flowchart of the OTDOA positioning method based on RNC in the embodiment of the present invention;

FIG. 8 is a flow chart of a SAS-based OTDOA positioning method in an embodiment of the present invention;

FIG. 9 is a flowchart of an RNC-based network-assisted GPS positioning method in an embodiment of the present invention;

10 is a flowchart of a SAS-based network-assisted GPS positioning method in an embodiment of the present invention;

Fig. 11 is a flow chart of the user terminal assisting detection of blind areas in the case of Cell_ID positioning without GPS/OTDOA in the embodiment of the present invention;

Fig. 12 is a flow chart of the user terminal sending assistance detection of blind area information through an indication message in an embodiment of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the specific embodiment of the present invention is described in further detail:

An embodiment of the present invention provides a method for MS-assisted detection of blind spots in a station replenishment scenario in a SON (Self-Organization Network, self-organizing network). The blind area refers to the area where the user cannot communicate with the network, including the area where the network information can be received but cannot be reported, and the area where the network information cannot be obtained and cannot be reported.

Among them, SON mainly includes the automatic management, configuration and optimization process in the planning, construction, configuration and upgrading process of the base station, and may also include the automatic management, configuration and optimization process caused by the status change of network elements in the network, for example, when the network management alarm occurs , the network needs to be able to automatically detect, judge and repair the network.

For the interference situation, the basis parameters for the interference classification in the network are RSSI, SNR, I, and INR as follows:

First, the threshold values determined by each relevant parameter are as follows:

[RSSI _min ] = R;

[SNR _min ]=S;

[I _margin ] = I;

[INR _min ]=log ₁₀ 10^(1/10)-1=N;

Among them, RSSI (Receive Signal Strength Indicator) is the received signal strength indicator; SNR (Signal Noise Ratio) is the signal-to-noise ratio; INR (Interference-to-Noise Ratio) is the interference-to-noise ratio; I (Interference) is interference;

Interference is categorized as follows:

Acceptable interference conditions:

RSSI>R, SNR>S, INR<N

Harmful Interference Conditions:

RSSI>R, SNR>S, INR>N

Denaturation interference conditions:

RSSI>R, SNR<S, INR>N

According to different interference conditions, there are also differences in processing. For example, for acceptable interference, communication can continue without adjustment; for harmful interference, although users can communicate, there is a risk that interference will cause communication interruption at any time. A certain technology can be used to identify other sources of interference, and through coordination The mechanism ensures the solution of network signal interference; for denatured interference, users can no longer communicate with the network, but they can still receive relevant information. If there is no way to eliminate the interference at this time, users will interrupt communication due to interference.

The judgment basis and relevant information of the above blind spots are as follows:

RSSI>R, SNR<S, INR>N (with signal blind area, that is, denatured interference) or RSSI<R, SNR<S, INR>N (no signal blind area).

The embodiment of the present invention mainly deals with no-signal blind areas, and its main scenarios are shown in Figures 1 and 2: a user terminal is in an active state in a certain cell, as shown in Figure 1 or Figure 2 in the ServingBS coverage area position 1.

Step 101, the user terminal passes through the blind area during the movement process, such as the area where position 2 is located in Figure 1 or Figure 2, it can judge whether it has entered a no-signal blind area by RSSI, SNR and INR values, and the user terminal in the blind area cannot receive When receiving any information from the network, the detection information within a preset time period is recorded, and the information includes the identity of the serving base station.

Step 102, when the user terminal continues to move and returns to an area with network signals from the blind area, such as the Target BS coverage area position 3 in Figure 1 or the Serving BS coverage area position 3 in Figure 2, the user terminal detects according to the time when the signal is regained The obtained measurement information obtains current dead zone related information.

In step 103, the user terminal reports the acquired information about blind spots to the network side after being confirmed by the network side device. It specifically includes: the user terminal establishes a communication channel with the network-side device that has regained the signal; the user terminal sends indication information to the network-side device, indicating that the user terminal has entered a blind zone before, and needs to report relevant information about the blind zone, triggering the system to enter the blind zone detection Processing process stage: the network side device judges whether it is necessary to report blind spot detection information, and if not, conducts normal communication; if necessary, sends a blind spot detection information reporting request message to the user terminal, the message carries relevant content, and distributes the reporting message The resource location of the resource; the user terminal uniformly reports all the information that the network side device needs to report to the network side device through the response message; the network side device performs blind area statistics and position calculation according to the received report information, and obtains The position information of the blind area.

In step 104, the network side calculates the position of the blind area by a blind area related processing module or device.

During the above dynamic movement process, there is a communication mechanism or communication method between the user terminal and the node on the network side (such as the serving base station or the target base station) to ensure that the user has relevant resources to use when he needs to report blind area information to the network side.

A process for detecting blind spots in the embodiment of the present invention is shown in Figure 3, which specifically includes the following steps:

Step 301, the MS performs the initial network access process through the Serving BS (serving base station), wherein it is optional to negotiate whether the MS and the network side support the user-assisted blind spot detection function in the SBC (SS Based Capability, user capability) negotiation process, and then Attached to the network through Serving BS.

Step 302, MS is in the activated state, records the relevant information needed for blind spot detection through the information obtained from the service network and association (association), and then due to movement, the MS enters the blind spot, that is, RSSI<R, SNR<S, INR>N .

Step 303, when the MS moves out of the blind zone, that is, when the RSSI and SNR received by the MS are lower than a certain threshold, it judges and records some relevant information about leaving the blind zone through the signal.

Step 304, for the situation shown in Figure 1, that is, after the user moves from the Serving BS coverage area to the blind area, and then moves to the target base station (Target BS) coverage area, in the MS moving process, the Target BS signal may be obtained, In the Target BS signal, after obtaining relevant information, establish a communication channel with the network side, access the network side through the communication channel and exchange blind area information with the network side (such as Target BS), and then the network side uses special modules or special equipment for statistics And calculate the position of the blind spot. For the situation shown in Figure 2, that is, the user moves from the Serving BS coverage area to the blind area, and then moves to the Serving BS coverage area. During the MS movement process, the Serving BS signal is obtained again, and the correlation is obtained in the Serving BS signal. After the information, a communication channel is established with the network side, and through this communication channel, it is connected to the network side and interacts with the network side (such as Serving BS) to exchange blind area related information. After that, the network side uses special modules or special equipment to make statistics and calculate the position of the blind area.

Step 302 in the above-mentioned embodiment is the process of detecting and reporting the blind area without signal, but in practice, a similar method can be used to mark and report the blind area with signal, such as judging RSSI>R, SNR<S, INR>N;

At the same time, step 304 is adjusted to: after the confirmation by the network side equipment, the MS sends the identification and information of the signal blind area to the network side equipment, so that the network side equipment can know that there is a signal blind area, and according to the statistical results fed back within a certain period of time, the presence of signal blind areas The coverage of network cells near the blind area is adjusted.

In Embodiment 1 of the present invention, there is an embodiment of the user terminal assisting detection of blind areas in the case of GPS or OTDOA (Observed Time Difference of Arrival), the flow is shown in Figure 4, and the specific steps are as follows:

Step 401, the MS performs the initial network access process through the Serving BS, wherein the SBC process negotiates whether the MS and the network side support the GPS/OTDOA function, and can negotiate whether the user equipment and the network side support the blind area detection function, etc. online.

Step 402, MS is in the activated state, through the information obtained in the serving network, such as the identification Serving BS ID of the serving base station, etc., may also include neighbor related information recorded in an association (association) mode, such as the identification list of the neighbor base station the list of the neighbor BSs, etc., and/or the last positioning information of the MS obtained through the positioning system, etc.

Step 403, when the MS enters the blind area, that is, when the received RSSI and SNR are lower than a certain threshold, it will judge and record some relevant information of the blind area through the signal, such as the last GPS/OTDOA positioning information before entering the blind area.

Step 404, when the user moves from the Serving BS coverage area to the blind area, and then moves to the TargetBS coverage area, the MS judges by receiving the RSSI and SNR detection value that it has entered a network with a signal and then exits the blind area, and the MS accesses the new The communication channel is established in the network; then, the MS initiates a positioning request to the network side, and then starts the positioning process and obtains the current position information of the MS; the MS reports the information recorded during the blind zone process and the position information obtained out of the blind zone to the Target BS , Target BS sends the received report information to the blind spot detection module or equipment to use a certain algorithm (such as GPS positioning algorithm, OTDOA positioning algorithm, or Cell_ID positioning algorithm, etc.) to perform blind spot statistics and position calculation, and obtain the blind spot position information.

For the case where the user moves from the Serving BS coverage area to the blind area and then moves to the Serving BS coverage area, the MS obtains relevant information and then re-establishes a communication channel with the network side, and the MS sends a positioning request message to the Serving BS through the established communication channel and enters the positioning process. The process obtains the current location, and then exchanges blind area related information with the network (Serving BS in Figure 2) through the reporting process, such as GPS/OTDOA positioning information entering and leaving the blind area, or Serving BS ID and neighbor BS ID list before entering the blind area, or SNR/RSSI/CINR, etc.; Serving BS sends the received information about the blind area to a special module or special equipment, and uses a certain algorithm (such as GPS positioning algorithm, OTDOA positioning algorithm, or Cell_ID positioning algorithm, etc.) to perform statistics and calculations out of the blind spot.

The embodiment of the present invention can be applied to the 3GPP environment, and can also be applied to the IEEE 802.16 standard environment, but the entity names in the two application environments are different. In the following embodiments, in the 3GPP environment, the terminal is UE, and the base station is Node B+SRNC, wherein, Node B is responsible for functions such as receiving transfer, and SRNC is responsible for processing functions such as scheduling; in the IEEE 802.16 standard, the terminal is MS, and the base station for BS. Although the entity names in the two environments are different, they actually perform similar functions. Therefore, the following embodiments are described in the 3GPP environment.

Wherein, the positioning method based on Cell_ID determines the location of the target UE by acquiring the cell ID of the target UE, and provides it to the positioning user. The target UE is in different states, such as CELL_DCH (in this state, a dedicated physical channel is allocated to the UE in the uplink and downlink, and the cell where the UE is located can be known according to the current active set of the UE, and the UE can use a dedicated transmission channel, downlink/uplink sharing transport channel or a combination of these transport channels), CELL_FACH (in this state, no dedicated transport channel is allocated to the UE, the UE continuously monitors a downlink FACH channel, and a default uplink common channel or uplink shared transport channel is allocated to the UE, so that Can be used at any time during the access process, the location of the UE is known to UTRAN at the cell level, specifically the cell reported when the UE initiated a cell update last time), etc. When the core network sends a request for LCS, the SRNC will query In UE state, if the UE is not active, the SRNC will page the UE to determine the ID of the cell where the UE is located. In order to improve the accuracy, SRNC can also use RTT (Round Trip Time, used in FDD) or Rx time deviation (used in TDD) measurement method. When the UE is in the soft handover state, it may be in the link state with multiple cells. Usually, the ID of the cell is determined by the following methods: select the cell with better signal quality; select the cell used by the UE and NodeB for linking; select the most recent UE-related cell. Cell; select the cell that is used by the UE and is not ready to be handed over; select the cell with the shortest distance to the NodeB; select the cell that is in the link state with the UE when receiving the SRNC request. The selection of the cell can also be based on RTT measurement or the power strength of the signal received by the UE, NodeB or LMU. Others such as IPDL (Idle Period Downlink) or SSDT (Site Selection Diversity Transmit) may also be used to select the cell. After the ID of the cell is determined, it is also necessary to convert the ID of the cell into geographic coordinates or a service area. The RNC-centered CELL_ID location method is shown in Figure 5, and the SAS-centered CELL_ID location method is shown in Figure 6.

OTDOA (Observed Time Difference of Arrival) positioning method, as shown in Figure 4, the UE measures the downlink pilot signals of different base stations, and obtains the TOA (Time of Arrival, arrival time) of the downlink pilot signals of different base stations, which is the so-called pilot phase Measurement. Based on the measurement results and in combination with the coordinates of the base station, an appropriate location estimation algorithm is used to calculate the location of the UE. The actual location estimation algorithm needs to consider the positioning of multiple base stations (3 or more), so the algorithm is relatively complicated. Generally speaking, the more the number of base stations measured by the UE, the higher the measurement accuracy, the more obvious the performance change of positioning, and the more complex the algorithm. Using this positioning method requires the base station measured by the UE to transmit downlink pilot signals at the same time. Therefore, all base stations in the network must realize time synchronization. Generally, base station synchronization can be realized by installing a GPS receiver in the base station or linking to a time synchronization network.

The OTDOA positioning method based on SRNC, as shown in Figure 7, includes the following steps:

In step 701, the CN sends a Location Request message to the SRNC to request the location information of the target UE. The SRNC will take into account the request and the positioning capabilities of the UTRAN and UE.

In step 702, the SRNC sends an OTDOA measurements request message to the UE, requesting an OTDOA positioning method. At this time, the UE should be in the CELL_DCH state, and if the location request message in step 501 includes the information of the periodic location report, the SRNC will request the periodic OTDOA measurement report.

In step 703, the SRNC sends a UE Rx-Tx timing Request message to the UE, requesting Rx-Tx time difference (for FDD) or TA (for TDD) or Tadv (for 1.28Mcps in TDD) information. If the location request message in step 501 includes the information of the periodic location report, the SRNC will request the periodic OTDOA measurement report. This step is optional.

Step 704, UE sends OTDOA measurement response to SRNC, returns OTDOA measurement result, SRNC receives OTDOA measurement information, and collects other calculation information.

Step 705, UE will send UE Rx-Tx timing Request message to SRNC, return Rx-Tx time difference (for FDD) or TA and Tadv (for TDD) information, and corresponding timestamp to SRNC. This step is optional.

Step 706, if the measurement information of OTDOA is insufficient, or in order to improve the measurement effect, SRNC will request RTT (for FDD) or TA of Rx (for TDD) from Serving Node B. In FDD, the SRNC will request the RTD from the relevant database. If constant, the RTD may be stored locally; if variable, the RTD must be updated at the TOD measured by OTDOA.

Step 707, Node B returns RTT (for FDD) or Rx timing deviation (for TDD) and/or arrival angle (1.28Mcps in TDD) to SRNC. The SRNC uses OTDOA to perform positioning, or to measure velocity. Calculations include positioning transformations; positioning estimates include the results of positioning and the resulting estimated accuracy; optional velocity estimates may also include accuracy.

Step 708, SRNC sends location estimate to CN, including location method and location accuracy. If the CN requires positioning accuracy, it should also include an indication of whether the positioning accuracy meets the required accuracy.

Step 709, if periodic reports are required in steps 701, 702 and 703, repeat steps 704-710. If only step 701 requires periodic reports (CN requires periodic reports), but steps 702 and 703 do not require periodic reports (SRNC does not require periodic reports), repeat steps 702-708.

The SAS-based OTDOA positioning method, as shown in Figure 8, includes the following steps:

In step 801, the CN sends a Location Request message to the SRNC to request the location information of the target UE. The SRNC will take into account the request and the positioning capabilities of the UTRAN and UE.

Step 802, SRNC will send PCAP Position Initiation Request message to SAS. The message includes the information of the Location Request, the periodic report message, the CELL_ID and the positioning capability of the UE.

Step 803, SAS (Stand Alone Serving mobile location centre, independent service mobile location center) sends PCAP Position Initiation Response message to SRNC, requests OTDOA positioning method, may request RTT (for FDD) or TA (for TDD) or at the same time Tadv (for 1.28Mcps in TDD). This message may include periodic reporting messages.

In step 804, the SRNC sends an OTDOA measurement request message to the UE, requesting an OTDOA positioning method. At this point, the UE should be in the CELL_DCH state. If the location request message in step 801 includes periodic location report information, the SRNC will request periodic OTDOA measurement reports.

Step 805, if the SAS requests Rx-Tx timing information, the SRNC will request Rx-Tx time difference (for FDD) or TA (for TDD) or Tadv (for 1.28Mcps in TDD) information from the UE. This request may include periodic reporting information. This step is optional.

In step 806, the UE returns an OTDOA measurement report to the SRNC. The SRNC receives OTDOA measurement information and collects other computational information.

Step 807, UE returns Rx-Tx time difference (for FDD) or TA (for TDD) or Tadv (for 1.28Mcps in TDD) information, and the timestamp to SRNC. This step is optional.

In step 808, the SRNC forwards the OTDOA measurement report information to the SAS, the information is included in the PCAPPosition Activation Response message, and may also include the RTT measurement report information.

Step 809, if the measurement information of OTDOA is insufficient, or in order to improve the measurement effect, SASServing Node B requests RTT (for FDD) or TA of Rx (for TDD). This step is optional.

Step 810, in FDD, based on the input from LMU, calculate RTD and save in SAS. This step is optional.

Step 811, Node B returns RTT (for FDD) or Rx timing deviation (for TDD) and/or arrival angle (1.28Mcps in TDD) to SRNC. This step is optional.

Step 812, SRNC forwards CELL_ID and RTT (for FDD) or TA (for TDD) or arrival angle information (for 1.28Mcps in TDD) to SAS, and these messages are included in the PCAPPosition Activation Response message. This step is optional.

In step 813, the SAS executes OTDOA-based or CELL_ID-based positioning calculation. If step 801 does not require periodic reporting, the SAS forwards the positioning information to the SRNC in the PCAP Position InitiationResponse message. If the periodic report is required in step 801, the SAS forwards the positioning information to the SRNC in the PCAP Position Periodic Result message. Calculations include positioning transformations; positioning estimates include the results of positioning and the resulting estimated accuracy; optional velocity estimates may also include accuracy.

In step 814, the SRNC transmits the positioning estimate to the CN, and the information transmitted at the same time includes the positioning method and an optional rate estimate. If the CN requires positioning accuracy, it should also include an indication of whether the positioning accuracy meets the required accuracy.

Step 815, if step 804 and step 805 require periodic positioning report, UE will send OTDOA measurement report or RTT (for FDD) or TA (for TDD) or arrival angle information (for 1.28Mcps in TDD) every interval And the timestamp is sent to SRNC, and SRNC includes these messages in the PCAP Position Periodic Report message and sends it to SAS. For each new positioning estimation, steps 809-812 will be repeated, and the SAS will perform positioning estimation based on OTDOA or CELL_ID, and forward the new positioning information to the SRNC in the PCAP Position Periodic Result message. The SRNC forwards the position estimate of the information along with the positioning method and optional rate to the CN. The Location Response message may contain an indication of whether the accuracy of the location estimate meets the required accuracy. Step 815 is repeated until the number of reports meets the requirement or the position estimation is stopped. The SAS may include the final position estimate in the PCAP Position Initiation Response message and send it to the SRNC, and the SRNC forwards it to the CN.

Step 816, if step 804 or step 805 does not require periodic position estimation, but step 802 requires periodic position estimation, SAS may repeat steps 803-814 until the number of positioning times reaches the requirement or terminate the positioning process. When the last positioning was repeated to step 813, the SAS may send the last position estimate included in the PCAP Position Initiation Response message to the SRNC.

Based on the GPS positioning method, the implementation steps are as follows: the network side receives the GPS auxiliary information; the network side sends the GPS auxiliary information to the UE; the UE obtains the GPS auxiliary information and calculates its own accurate position; the UE sends the position information to the core network. There are two types of GPS-based positioning methods: assisted and autonomous.

Among them, the assisted GPS positioning method transplants most of the functions of the traditional GPS receiver to the network processor for realization, which requires equipment such as antenna, RF unit and data processor. The network side sends a series of extremely short auxiliary information to the UE, including time, a list of observable satellites, Doppler parameters of satellites and a code phase search window. These parameters help the built-in GPS module reduce the acquisition time of GPS signals. The assistance data comes from the pseudo-range data processed by the UE's GPS module, and can last for several minutes. After receiving the pseudo-range data, the corresponding network processor or positioning server can roughly estimate the position of the UE, and after adding necessary corrections on the network side, the positioning accuracy can be improved.

Among them, in the autonomous GPS positioning mode, the UE includes a full-featured GPS receiver, which has all the functions of the UE in the UE-assisted GPS positioning mode, and also has the calculation function of the satellite position and the UE position. At the beginning of position calculation, UE needs more data than UE-assisted methods. These data can last for more than 4 hours or be updated as needed, and usually include time, reference position, satellite ephemeris and time calibration parameters. If higher accuracy is required for certain applications, differential GPS (DGPS) signals must be continuously sent to the UE. DGPS signals are effective in a very wide geographical range, and a reference receiver can serve a wide geographical range as the center. The final location is calculated by the UE itself, and this positioning information can be sent to any application if necessary.

The RNC-based network-assisted GPS positioning method, as shown in Figure 9, comprises the following steps:

Step 901, the application program in the CN sends a Location Request message to the SRNC, requesting the location information of the target UE. The SRNC will take into account the request as well as the location capabilities of the UTRAN and UE.

Step 902, according to the capabilities of the UE, the network side sends a GPS measurement request carrying GPS assistance information to the UE. GPS auxiliary information includes GPS reference time, satellite ID, Doppler power, search window and center point, ephemeris and clock correction, almanac, etc. According to the capabilities of the UE, the network side sends a GPS positioning request to the UE. If the Location Request message in step 901 contains periodic report information, the SRNC will periodically request a periodic report; if the UE does not have enough auxiliary information to perform measurement, it will request more auxiliary information from the SRNC; if it is a UE-based positioning method , go to step 908.

Step 903, if it is a UE-based positioning method, before the auxiliary information is sent to the UE, the SRNC will request the following information: LMU update, RTT measurement, etc. LMU will return the time difference between NodeB and GPS to SRNC; Node B will return RTT measurement to CRNC. If CRNC is not SRNC, then CRNC will forward these information to SRNC.

Step 904, the network side requests the UE to measure the pseudo-range of the GPS satellite, and requests other information. SRNC may request SFN-SFN Observed Time Difference measurement and Rx-Tx Timing Difference information from UE.

In step 905, the UE returns the measurement information and other information of the GPS satellite pseudo-range to the network. If necessary, the UE will also return the SFN-SFN Observed Time Difference measurement and Rx-Tx TimingDifference information, and their timestamps to the SRNC.

Step 906, the network side calculates a location estimate and an optional rate estimate.

Step 907, if the information of the location estimation is insufficient, the SRNC will restart the new location process from step 703.

Step 908, if it is a UE-based positioning method, the UE will send a position estimate and an optional rate estimate to the SRNC. The message includes position information, optional velocity information, accuracy and a timestamp.

Step 909, in the network including the SAS, the SAS will deliver the location estimate to the SRNC.

Step 910, SRNC transmits location information and optional velocity estimate to CN. The message also includes a positioning method. If the CN requires the accuracy of the location estimation, the Location Response message will include an indication of whether the accuracy of the location estimation meets the required accuracy.

Step 911, if periodic reporting is requested in steps 901 and 902, steps 905-910 will be repeated. The UE shall send a new position estimate every interval. If CN requests periodic report in step 901, but SRNC does not request periodic report in step 902, SRNC will repeat step 902-step 910. The SRNC will send a new location estimate to the CN every interval until the number of location reports reaches the required number of requests.

The network-assisted GPS positioning method of SAS initialization, as shown in Figure 10, comprises the following steps:

Step 1001, the application program in the CN sends a Location Request message to the SRNC, requesting the location information of the target UE. The SRNC will take into account the request and the positioning capabilities of the UTRAN and UE.

In step 1002, the SRNC receives the Location Request message which also includes the periodic report message, and the CELL_ID and the positioning capability of the UE included in the PCAP Position Initiation Request.

Step 1003, according to the capabilities of the UE, the SAS sends a PCAP Position Activation Request message to the SRNC to initiate GPS positioning. The message includes GPS assistance data and possibly periodic reporting information. SAS may provide assistance data from multiple GPSs.

Step 1004, the SRNC uses the RRC signaling to forward the location request of the SAS to the UE. RRC signaling may also include periodic report information.

Step 1005, if it is UE-assisted GPS. The SRNC requests measurements of GPS satellite pseudo-range information and other information from the UE. SRNC may request SFN-SFN Observed TimeDifference measurement and Rx-Tx Timing Difference information from UE. The UE returns the measurement information and other information of the pseudo-range of the GPS satellites to the network. If necessary, the UE will also return the SFN-SFN Observed TimeDifference measurement and Rx-Tx Timing Difference information, and their timestamps to the SRNC.

Step 1006, SRNC sends PCAP Position Activation Response message to SAS. This message includes the information contained in step 805 .

Step 1007, the SAS calculates a location estimate and an optional velocity estimate. If the periodic report is not carried in step 802, the SAS will send a PCAP Position Initiation Response message to the SRNC. The message includes a location estimate and an optional velocity estimate, and possibly information about the location method and whether the accuracy of the location estimate meets the required accuracy. Otherwise, SAS will send PCAP Position PeriodicResult message to SRNC. The message includes a location estimate, possibly location method information, and an indication of whether the accuracy of the location estimate meets the required accuracy.

Step 1008, if it is a UE-based positioning method, the UE returns a positioning estimate and an optional rate estimate to the SRNC through RRC signaling. The SRNC includes the position estimate and an optional rate estimate in the PCAP Position Activation Response message and forwards it to the SAS. The message may also include location method information and an indication of whether the accuracy of the location estimate meets the required accuracy.

In step 1009, the SAS may confirm the location estimate (such as CELL_ID information) in step 808. If do not ask for periodical report in step 1002, SAS will send PCAP Position Initiation Response message to SRNC. The message includes a location estimate and an optional velocity estimate, and possibly information about the location method and whether the accuracy of the location estimate meets the required accuracy. Otherwise, SAS will send PCAP PositionPeriodic Result message to SRNC. The message includes a location estimate, possibly location method information, and an indication of whether the accuracy of the location estimate meets the required accuracy. If the information of the positioning estimation is insufficient, the SRNC will restart a new positioning process from step 1003 .

Step 1010, SRNC transmits location information and optional velocity estimate to CN. The message also includes a positioning method. If the CN requires the accuracy of the location estimation, the Location Response message will include an indication of whether the accuracy of the location estimation meets the required accuracy.

Step 1011, if a periodic report is requested in step 1004, the UE sends a GPS measurement report every interval. The SRNC includes the measurement report in the PCAP Position Periodic Report message and forwards it to the SAS. The SAS may calculate a position estimate and an optional rate estimate, and confirm the calculated position estimate and the position estimate received from the SRNC, and forward the position information to the SRNC in the PCAPPosition Periodic Result message. If the positioning method information can be obtained, the SRNC will forward the positioning method information to the CN. If the CN requires location accuracy, the LocationResponse message will include an indication of whether the location estimation accuracy meets the required accuracy. Step 1011 is repeated until the number of positioning estimates sent reaches the required number of times. The SAS may include the final positioning information in the PCAP Position Initiation Response message and send it to the SRNC, and the SRNC forwards the final positioning estimate to the CN.

Step 1012, if periodic reporting is not required in step 1004 but is required in step 1002, the SAS will repeat steps 1003-1010 until the number of positioning estimates sent reaches the required number, or the CN terminates the positioning process. When the step 1008 of the last request, the SAS will include the final positioning result in the PCAP Position Initiation Response message and send it to the SRNC.

The three basic positioning methods specified in 3GPP are introduced above. They can be used in different situations. The positioning method based on CELL_ID can be used when the positioning accuracy is low; the OTDOA method can be used when the positioning accuracy is high and the UE and the network It is used when there is no GPS receiver device; while the GPS-based positioning method is suitable for use when the positioning accuracy is high and the UE and the network have GPS devices. In addition, these several positioning methods can be used in combination at the same time to make up for the shortcomings of each other. For example, using the positioning method based on CELL_ID and OTDOA at the same time can obtain better positioning effect in rural areas and dense urban areas. The network uses multiple positioning methods at the same time to provide positioning services for different applications and different users in different situations.

In the second embodiment of the present invention, there is no GPS/OTDOA but only the Cell_ID positioning embodiment of the user terminal assisting detection of blind areas, as shown in Figure 11, the specific steps are as follows:

Step 1101, the MS performs an initial network access process through the Serving BS, in which it can negotiate whether the MS and the network support the user-assisted blind spot detection function in the user capability negotiation process, and then attaches to the network through the Serving BS.

Step 1102, the MS obtains information through the serving network in the activated state, such as the Serving BS ID of the serving base station, and records neighbor-related information in an association manner, such as the list of the neighbor BS, etc., and caches them .

Step 1103, the MS enters the blind zone, that is, when the received RSSI and SNR are lower than a certain threshold, and the INR is higher than a certain threshold, judge and record and save some relevant information of the blind zone through the signal, such as the service base station identifier cached before entering the blind zone, and Neighbor base station list information at that time, etc., and related to blind area related information.

Step 1104, for the situation shown in Figure 1, that is, after the user moves from the Serving BS coverage area to the blind area, and then moves to the Target BS coverage area; the MS judges that it has entered a network with signals through RSSI, SNR, and INR detection values That is, to exit the blind zone, the MS accesses the new network and establishes a communication channel, and then sends the information recorded by the MS in the blind zone process to the network side and obtains the information of exiting the blind zone, that is, the Serving BS ID and neighbor BS ID list before entering the blind zone , or RTD/SNR/RSSI/CINR, etc., report to the Target BS, and the Target BS sends the received report information to the blind spot detection module or equipment to use a certain algorithm (such as Cell_ID positioning algorithm, etc.) to perform blind spot statistics and position calculation, and obtain The position information of the blind area.

For the situation shown in Figure 2, that is, the user moves from the Serving BS coverage area to the blind area, and then moves to the Serving BS coverage area. During the mobile process of the MS, the MS returns to the signal coverage of the serving base station (Serving BS in Figure 2). In this signal, the MS obtains relevant information and then establishes a communication channel with the network side. After that, the MS accesses the network through the communication channel. The network side also exchanges blind zone information with ServingBS (Serving BS in Figure 2), that is, RTD/SNR/RSSI/CINR before and after entering the blind zone, and finally, Serving BS sends the received blind zone related information to special modules or special equipment, And use a certain algorithm (such as Cell_ID positioning algorithm, etc.) to perform statistics and calculate the position of the blind area.

The positioning algorithm in the second embodiment of the present invention is the same as that in the first embodiment, and will not be repeated here.

In Embodiment 3 of the present invention, the user terminal sends assist detection blind area information through an indication message. The specific process is shown in FIG. 12 , including the following steps:

Step 1201, the MS performs the initial network access process through the Serving BS, wherein it is based on the SBC negotiation process to negotiate whether the MS and the network side support the GPS/OTDOA function, and can negotiate whether the MS and the network support the user-assisted blind spot detection function, etc., and then pass the Serving BSs are attached to the network.

Step 1202, the MS is in the active state, through the information obtained in the serving network, such as the identification of the serving base station Serving BS ID, etc., the association (association) method records neighbor related information, such as the list of the identification list of the neighbor base station etc., and or if the MS performs positioning regularly, the last GPS/OTDOA positioning information of the MS obtained through the positioning system, etc., and saved.

Step 1203, the MS enters the blind zone, that is, when the RSSI and SNR received by the MS are lower than a certain threshold, it will judge and record and save some relevant information of the blind zone through the signal, such as the serving base station ID cached before entering the blind zone, and/or the current Neighbor base station list information, and/or last positioning information, etc., are associated with the blind area identification related information.

Step 1204, for the situation shown in Figure 1, that is, the user moves from the Serving BS coverage area to the blind area, and then moves to the Target BS coverage area. At this time, the MS judges by receiving the RSSI and SNR detection values that it enters the network with signals and exits the blind zone, and the MS accesses the ServingBS network and establishes a communication channel; then, the MS will send other messages or special messages to the network side Carrying a bit of indication information in it, indicating that the MS has entered the blind area before, and now needs to report the relevant information of the blind area, triggering the system to enter the blind area detection process stage; after that, the Target BS will use certain information, such as the blind area that the current network resources have collected Information status, etc., to determine whether a subsequent blind spot detection information reporting process is required. If not, the user will communicate normally after a specified period of time, otherwise the Target BS will actively send a blind spot detection information report request message, which carries relevant content, such as the name of the parameter to be reported, the resource location of the allocated report message, etc. Next, if the content to be reported by the MS includes location information, the MS and the Target BS or other neighboring BSs need to perform a GPS/OTDOA location process. After obtaining the location information of the MS, send the BS in the request message through a response message. The information that needs to be reported is reported to BS in a unified manner. Subsequently, the Target BS sends the received report information to the blind spot detection module or equipment to use a certain algorithm (such as GPS positioning algorithm, OTDOA positioning algorithm, Cell_ID positioning algorithm, etc.) to perform blind spot statistics and position calculation to obtain the blind spot location information. For the situation shown in Figure 2, that is, the user moves from the Serving BS coverage area to the blind area, and then moves to the Serving BS coverage area. During the mobile process of the MS, the MS returns to the signal coverage of the serving base station (Serving BS in Figure 2). In this signal, it obtains relevant information and then establishes a communication channel with the network. After that, it accesses the network through this communication channel and Exchange information with Serving BS (Serving BS in Figure 2). Afterwards, the MS will carry one-bit indication information in other messages or dedicated messages sent to the network side, indicating that the MS has entered a blind area before, and now needs to report information about the blind area, triggering the system to enter the blind area detection process. Afterwards, the Serving BS will judge whether it is necessary to carry out the follow-up blind spot detection information reporting process based on some information, such as the blind spot information collected by the current network resources. If not required, the user will communicate normally after the specified time period; otherwise, the Serving BS will actively send a blind spot detection information report request message, and the message carries relevant content, such as the parameter name to be reported (RSSI/SNR/CINR/RTD/RSSI /SNR/GPS/OTDOA information), resource locations for allocating reported messages, etc. Next, if the content that the MS needs to report includes GPS/OTDOA positioning information, the MS and the Serving BS or other neighboring BSs need to perform a positioning process. After obtaining the location information of the MS, the BS needs to report in the request message through the response message. All the information is uniformly reported to the BS; then, the Serving BS sends the received report information to the blind area detection module or equipment to use a certain algorithm (such as GPS positioning algorithm, OTDOA positioning algorithm, Cell_ID positioning algorithm, etc.) to perform blind area statistics and position calculation , to obtain the position information of the blind area.

An embodiment of the present invention provides a system for detecting a blind area, including: a user terminal, used to record detection information within a preset time, the information including the identity of the serving base station; The measurement information obtains the current blind area information; and after being confirmed by the network side equipment, reports the obtained blind area information to the network side, so that the network side obtains the position of the blind area; the network side equipment is used to receive the confirmed The information reported by the user terminal is used for blind area statistics and position calculation to obtain the position information of the blind area. The network side device is a target base station or a serving base station.

The user terminal includes: a blind spot detection unit, used to judge whether the user terminal enters a blind spot, or moves out of a blind spot; an information acquisition and buffer unit, used to record detection information within a preset time, and the information includes the identity of the serving base station ; If moving out of the blind zone, obtain the current blind zone information according to the measurement information detected when the signal is reacquired; the information reporting unit is used to obtain the confirmation of the network side equipment, and report the obtained blind zone information to the network side, so that the network side Obtain the position of the dead zone.

The user terminal further includes: an indication sending unit, configured to send indication information to the network side equipment, indicating that the user terminal has entered a blind area before, and needs to report information related to the blind area, and trigger the network side equipment to enter the blind area detection process; information The receiving unit is configured to receive the blind area detection information report request message sent by the network side device, and the message carries the relevant content required for blind area reporting and the resource location of the allocation report message; the negotiating unit is configured to negotiate with the user equipment whether all Support user-assisted blind spot detection function.

The network side equipment includes: a report information receiving unit, configured to receive the report information sent by the user terminal; a position calculation unit, configured to perform blind spot statistics and position calculation according to the received user terminal report information, and obtain the position of the blind spot Information; a judging unit, used to judge whether it is necessary to report blind spot detection information, and if not, perform normal communication; if necessary, send a blind spot detection information reporting request message to the user terminal, the message carries relevant content, and distributes the reporting message resource location; a negotiation unit, configured to negotiate with the user equipment whether to support the user-assisted blind spot detection function.

In the embodiment of the present invention, the location of the blind area is realized through the user's feedback, and an information reference is provided for the subsequent network operator to deploy the base station, eliminating the need for the operator to perform a drive test to determine the blind area, saving the operator's time The cost ensures the full coverage of the network. And avoid delaying reporting or rejecting user reports under heavy load conditions.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is a better implementation Way. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions to make a A computer device (which may be a personal computer, a server, or a network device, etc.) executes the methods described in various embodiments of the present invention.

The above disclosures are only a few specific embodiments of the present invention, however, the present invention is not limited thereto, and any changes conceivable by those skilled in the art shall fall within the protection scope of the present invention.

Claims (13)

1, a kind of method that detects the blind area is characterized in that, may further comprise the steps:

Detection information in the user terminal record Preset Time, described information comprises the sign of serving BS;

Described user terminal shifts out the blind area, detects the metrical information that obtains when recapturing signal and obtains present dead zone information;

Described user terminal is reported the described dead zone information that obtains after confirming by the base station, is made network side obtain the position of described blind area to network side.

2, detect the method for blind area according to claim 1, it is characterized in that, described user terminal reports to network side that with the blind area relevant information of obtaining the position that makes network side calculate the blind area specifically comprises after confirming by the base station:

User terminal is set up communication port with the network equipment of recapturing signal;

Described user terminal sends indication information to network equipment, shows that described user terminal entered the blind area before, need report the blind area relevant information, and triggering system enters the blind area detection procedure stage;

Network equipment judges whether to carry out blind area detection information and reports, if do not need, communicates by letter normally; If need, send blind area detection information to described user terminal and report request message, carry the resource location of related content, distribution reporting message in the message;

Described user terminal is offered described network equipment by response message with the information unification that described network equipment need report, and described information comprises and enters neighbor information and locating information before the blind area;

Described network equipment carries out blind area statistics and position calculation according to the report information of receiving, draws the positional information of blind area.

3, detect the method for blind area according to claim 1, it is characterized in that, described user terminal reports to network side that with the blind area relevant information of obtaining the position that makes network side calculate the blind area specifically comprises after confirming by the base station:

User terminal is set up communication port with the network equipment of recapturing signal;

User terminal is initiated Location Request to described network equipment, obtains the user terminal current position information;

The positional information that the information that user terminal will write down before entering the blind area and obtaining shifts out the blind area reports described network equipment, and described network equipment carries out blind area statistics and position calculation according to the report information of receiving, draws the positional information of blind area.

4, detect the method for blind area according to claim 1, it is characterized in that, the deterministic process that described user terminal shifts out the blind area specifically comprises:

Judge whether to shift out described no signal blind area by received signal intensity indication RSSI, signal to noise ratio snr and interference-to-noise ratio INR.

5, detect the method for blind area according to claim 1, it is characterized in that, also comprise before the detection information in the described user terminal record Preset Time:

User terminal and network side are consulted both sides and whether are all supported the auxiliary blind area of user measuring ability.

6, as the method for detection blind area as described in claim 2 or 3, it is characterized in that the mode that described network side calculates the position of blind area comprises: GPS location, OTDOA location or Cell_ID location.

7, as the method for detection blind area as described in claim 2 or 3, it is characterized in that described network equipment is target BS or serving BS.

8, a kind of system that detects the blind area is characterized in that, comprising:

User terminal is used to write down the detection information in the Preset Time, and described information comprises the sign of serving BS; If shift out the blind area, detect the metrical information that obtains when recapturing signal and obtain present dead zone information; And by after the network equipment affirmation, the described dead zone information that obtains is reported to network side, make network side obtain the position of described blind area;

Network equipment is used for carrying out blind area statistics and position calculation according to receiving through the user terminal report information of confirming, draws the positional information of blind area.

9, a kind of user terminal is characterized in that, comprising:

The blind area detecting unit is used to judge whether described user terminal enters the blind area, or shifts out the blind area;

Information is obtained and buffer unit, is used to write down the detection information in the Preset Time, and described information comprises the sign of serving BS; If shift out the blind area, detect the metrical information that obtains when recapturing signal and obtain present dead zone information;

Information reports the unit, after being used to obtain the affirmation of network equipment, the described dead zone information that obtains is reported to network side, makes network side obtain the position of described blind area.

10, as user terminal as described in the claim 9, it is characterized in that, also comprise:

The indication transmitting element is used for sending indication information to network equipment, shows that described user terminal entered the blind area before, need report the blind area relevant information, triggers described network equipment and enters the blind area detection procedure;

Information receiving unit is used to receive the blind area detection information that described network equipment sends and reports request message, carries the resource location that the blind area reports required related content, distributes reporting message in the described message.

11, as user terminal as described in the claim 9, it is characterized in that, also comprise:

Negotiation element is used for consulting whether all to support the auxiliary blind area of user measuring ability with network side.

12, a kind of network equipment is characterized in that, comprising:

The report information receiving element is used to receive the report information that described user terminal sends;

Position calculation unit is used for carrying out blind area statistics and position calculation according to the user terminal report information of receiving, draws the positional information of blind area;

Judging unit is used to judge whether to carry out blind area detection information and reports, if do not need, communicates by letter normally; If need, send blind area detection information to described user terminal and report request message, carry the resource location of related content, distribution reporting message in the message.

13, as network equipment as described in the claim 12, it is characterized in that, also comprise:

Negotiation element is used for consulting whether all to support the auxiliary blind area of user measuring ability with subscriber equipment.

Images