WO2014000715A1 - Method and apparatus for locating mobile terminal - Google Patents

Abstract

Disclosed are a method and an apparatus for locating a mobile terminal. The method comprises: sending a request for obtaining reference point information to a currently connected wireless network; receiving reference point information returned by the wireless network, the reference point information comprising information about a short distance reference point near the mobile terminal and determined by the wireless network according to information about a cell or location where the mobile terminal is currently located; and determining, according to the reference point information, a measurement reference point used for locating, and obtaining the location of the mobile terminal according to the measurement reference point. By means of the present invention, an indoor or outdoor network device existing on the wireless network can be used to locate the mobile terminal, and the locating precision in an indoor or outdoor environment is improved.

Description

 The present invention claims the Chinese patent application filed on June 25, 2012 by the Chinese Patent Office, the application number is 201210209735.6, and the invention name is "a mobile terminal positioning method and device". Priority is hereby incorporated by reference in its entirety. Technical field

 The present invention relates to the field of wireless communications, and in particular, to a method and a device for locating a mobile terminal. Background technique

 Wireless positioning is a necessary means to ensure human traffic safety and military activities. It can play a role in many fields and scenarios, such as geodesy, earthquake prediction, vehicle transportation scheduling, forest fire prevention, address exploration and land development, navigation. /Aviation of safe navigation and traffic control, positioning and control of spacecraft and timing, mobile communications, search and rescue, etc.

 The positioning methods of existing mobile terminals are roughly classified into two categories, satellite wireless positioning and terrestrial wireless positioning. The satellite wireless positioning technology represented by Global Positioning System (GPS) acquires the wireless signal sent by the satellite through the ground receiver, and uses the relevant technology to obtain the measured code pseudorange or phase pseudorange, and uses the space rear intersection method to solve Calculate the coordinates of the ground point and finally achieve the purpose of positioning and navigation. In addition to the GPS global positioning system, other satellite wireless positioning and navigation systems include the GLONASS system, the European Union's Galileo system, and China's Beidou navigation system; now, such positioning systems are generally referred to as Global Navigation Satellite System (Global Navigation Satellite System). , GNSS λ

 The terrestrial wireless positioning method mainly includes cellular wireless positioning technology. The basic principle of wireless cellular is to measure the wireless signal propagation time or the direction of the propagation direction between a series of cellular base stations and mobile stations, and use spatial geometric knowledge to perform mobile station location. Calculation, such as a cell identification (CELL ID) based positioning method, and the like.

However, whether it is cellular wireless positioning technology or GNSS positioning technology, there are similar problems, that is, because the penetration performance of GNSS signals is very poor, as long as the mobile terminal enters indoors In the environment, the receiver can only receive very weak signals. Usually, even if the signal is not received at all, the positioning of the mobile user cannot be achieved. For the wireless positioning technology of the cellular network, once the non-line-of-sight propagation phenomenon occurs, When other harsh environmental factors are affected, the positioning accuracy will be greatly reduced, and even the meaning of positioning navigation will be completely lost.

 That is to say, when the two technologies are in the case of non-line-of-sight propagation outdoors or indoors, their positioning will be severely limited. Summary of the invention

 The technical problem to be solved by the embodiments of the present invention is to provide a positioning method and device for a mobile terminal. It can improve the presence of non-line-of-sight propagation outdoors or the positioning accuracy when indoors.

 In one aspect, an embodiment of the present invention provides a method for locating a mobile terminal, including: sending a reference point information acquisition request to a currently connected wireless network;

 Receiving reference point information returned by the wireless network, where the reference point information includes information of a short-distance reference point near the mobile terminal determined by the wireless network according to cell information and/or location information currently in which the mobile terminal is currently located. ;

 A measurement reference point for positioning is determined based on the reference point information, and a location of the mobile terminal is obtained according to the measurement reference point.

 In another aspect, the embodiment of the present invention further provides a method for locating a mobile terminal, including: receiving, by a wireless network, a reference point information acquisition request sent by the mobile terminal;

 Determining, by the wireless network, information of a short-distance reference point in the vicinity of the mobile terminal according to the cell information and/or location information of the mobile terminal, and generating reference point information according to the information of the short-distance reference point;

 Returning the reference point information to the mobile terminal, so that the mobile terminal determines a measurement reference point for positioning according to the reference point information, and obtains a location of the mobile terminal according to the measurement reference point.

 On the other hand, the implementation of the present invention provides a mobile terminal, including:

a request sending unit, configured to send a reference point information acquisition request to the currently connected wireless network; the information receiving unit, configured to receive the reference point information returned by the wireless network after the request sending unit sends the reference point information obtaining request The reference point information includes the wireless network Information about a short-distance reference point near the mobile terminal determined according to cell information and/or location information currently in which the mobile terminal is currently located;

 And a positioning unit, configured to determine a measurement reference point for positioning according to the reference point information received by the information receiving unit, and obtain a location of the mobile terminal according to the measurement reference point.

 On the other hand, the implementation of the present invention further provides a wireless network device, including: a request receiving unit, configured to receive a reference point information acquisition request sent by the mobile terminal; and a reference point determining unit, configured to receive at the request receiving unit After the reference point information acquisition request, determining, according to the cell information and/or location information that the mobile terminal is currently located, information about the short-distance reference point in the vicinity of the mobile terminal, and generating information according to the information of the short-distance reference point Reference point information;

 An information sending unit, configured to return the reference point information to the mobile terminal after the reference point determining unit determines the reference point information, so that the mobile terminal determines a measurement reference for positioning according to the reference point information And obtaining a location of the mobile terminal according to the measurement reference point.

 In the embodiment of the present invention, the reference point is configured for the mobile terminal according to the cell or location where the mobile terminal is located, and the mobile terminal is located through the reference point, because the reference point may be any in the wireless network. The network element, and not necessarily limited to the base station equipment, enables the mobile terminal to perform positioning through such reference points in both indoor and outdoor environments where the GPS signal strength is poor, and indoor and outdoor environments where the station signal is weak. , greatly improving the positioning accuracy of the mobile terminal in various complicated situations. DRAWINGS

 In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description It is merely some embodiments of the present invention, and those skilled in the art can obtain other drawings according to the drawings without any creative work.

 1 is a schematic diagram of a specific composition of a mobile terminal in an embodiment of the present invention;

 2 is a schematic diagram of a principle for positioning a mobile terminal with two reference points in an embodiment of the present invention;

3 is a mobile terminal having three or more reference points in an embodiment of the present invention; Schematic diagram of the principle of positioning;

 4 is a schematic diagram of a specific configuration of a request sending unit in an embodiment of the present invention; FIG. 5 is a schematic diagram of a specific configuration of a wireless network device according to an embodiment of the present invention; FIG. 6 is a reference point determining unit in an embodiment of the present invention. FIG. 7 is a schematic diagram of another specific configuration of a wireless network device in an embodiment of the present invention; FIG. 8 is a schematic flowchart of a specific method for positioning a mobile terminal in the implementation of the present invention; FIG. 10 is a schematic diagram of a specific flow chart of a positioning method of a mobile terminal according to an embodiment of the present invention; FIG. 10 is a schematic diagram of a positioning process in which a network side performs an allocation of reference points by an EPC network element in the embodiment of the present invention, and the terminal preferentially determines whether GPS positioning can be used when performing positioning;

 11 is a schematic flowchart of sending a positioning result to an EPC and triggering a reference point to perform positioning after the UE performs positioning according to the prior art manner in the embodiment of the present invention;

 FIG. 12 is a schematic flowchart of positioning by using a combination of a fixed reference point and a moving reference point in the embodiment of the present invention; FIG.

 FIG. 13 is a schematic diagram of a process of performing positioning by using a combination of a fixed reference point and a mobile reference point in the embodiment of the present invention, but the EPC does not group the UE;

 FIG. 14 is a flow chart showing the cyclical location reporting and the EPC periodic delivery of group location information in a group according to an embodiment of the present invention. detailed description

 The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In the embodiment of the present invention, a new wireless positioning technology is provided. When an existing GPS or other precise positioning method is not available, such as wireless positioning in an environment with poor GPS signals. In the positioning mode in the embodiment of the present invention, the network side may acquire the location of multiple network elements in the vicinity of the mobile terminal, and use these network elements as reference points to locate the mobile terminal; in the indoor/outdoor environment, the network elements may It is a network element such as an access point, an indoor router or a gateway in Wireless High-Fidelity (WiFi), so that accurate location services can be performed based on short-distance reference point positioning by these network elements. A mobile terminal and a wireless network device are included in the wireless network system of the embodiment of the present invention. As shown

As shown in FIG. 1, the mobile terminal 1 includes: a request sending unit 10, configured to send a reference point information acquisition request to a currently connected wireless network; and an information receiving unit 12, configured to send the reference point information in the request sending unit 10. Receiving, after the obtaining the request, the reference point information returned by the wireless network, where the reference point information includes the short-distance reference point of the mobile terminal determined by the wireless network according to the cell information or the location information currently located by the mobile terminal. The positioning unit 14 is configured to determine a measurement reference point for positioning according to the reference point information received by the information receiving unit 12, and obtain a location of the mobile terminal according to the measurement reference point.

 The measurement reference point may be two reference points, three reference points or more than three reference points. For a different number of reference points, the positioning manner is different, that is, the positioning unit 14 can be specifically used to measure the distance between the two reference points when the measurement reference point is two reference points, and determine Determining, by the mobile terminal, a position of the projection point as a position of the mobile terminal at a projection point where the two measurement reference points are connected; the positioning unit 14 may be specifically configured to be used when the measurement reference point is When three or more reference points are used, the position of the mobile terminal is obtained according to the Observed Time Difference of Arrival (OTDOA) method according to the three or three reference points. The existing OTDOA is a technology for locating a plurality of (eg, three or more) base stations and mobile terminal signal propagation time difference. In the embodiment of the present invention, based on the technical principle, a corresponding basis is proposed. A technique of locating a plurality of reference points from a distance of a mobile terminal. The above principles are explained separately below.

As shown in Figure 2, when there are two reference points, the mobile terminal (ie with the positioning point A) can measure the distance between each reference point (reference point 1 and reference point 2 in the figure) and calculate two references. The distance between the points further determines the position of the 'mid point, and the distance h from the midpoint to the point to be positioned. Positioning through two reference points cannot determine which point in the A and A mirrors to be located is the point to be located, and which point is the mirror image. Therefore, the midpoint of the point to be located and the mirror is selected as the positioning result, and the error is h. If h is less than a certain limit, it can be selected according to the positioning accuracy requirements. For example, a system with a requirement of 10 meters accuracy can be positioned with two reference points when h is less than 10 meters. This positioning method is to meet the system requirements. If h is greater than 10 meters, the requirements are not met and other methods need to be considered. Of course, if the wireless terminal to be located is closer to a certain reference point, the location of the reference terminal can be used instead of the location of the wireless terminal. As shown in FIG. 3, for a case where there are three or more reference points, the mobile terminal (measured point in the figure) measures the distance to different reference points (eg, by measuring the delay to reach different reference points). distance). According to the measurement result, the difference between the reference point 0 and the reference point 1 is the hyperbola A of the measured distance difference, and the difference between the reference point 0 and the reference point 1 is the hyperbola B of the measured distance difference, The intersection of the two hyperbolas is the position of the measured point. When the number of reference points is larger, the more measured points are measured, and the actual position of the measured points can be more accurately estimated based on these positions, that is, the measurement accuracy is higher.

 In the embodiment of the present invention, the reference point information acquisition request sent by the request sending unit 10 may include the cell information where the mobile terminal is currently located and the historical location information of the mobile terminal. The historical location information may be the location of the mobile terminal measured according to other methods, or the location information previously measured by the same method.

 Further, in the embodiment of the present invention, the GPS measurement may be performed first. When the GPS measurement accuracy is found to be insufficient, the reference point measurement mode in the embodiment of the present invention is adopted. As shown in FIG. 4, the request sending unit 10 may include: The GPS positioning unit 100 is configured to search for a GPS signal, and determine whether the GPS signal is lower than a measurement threshold. When the determination result is yes, check whether the reference point information is saved locally; the reference point positioning unit 102 is configured to be used. When the GPS positioning unit 100 confirms that the reference point information is not locally present, it transmits a reference point information acquisition request to the currently connected wireless network.

 Further, when measuring, not only a fixed network element in the wireless network can be used as a reference point, but also other mobile terminals can be used as a reference point, and the reference point information received by the information receiving unit 12 can include fixed reference point information and a mobile reference. Point information, the mobile reference point is another mobile terminal in the vicinity of the mobile terminal.

As shown in FIG. 5, it is a schematic diagram of a specific composition of a wireless network device in the embodiment of the present invention, and the wireless network device may be an evolved packet core network device. The wireless network device 2 includes: a request receiving unit 20, configured to receive a reference point information acquisition request sent by the mobile terminal, and a reference point determining unit 22, configured to: after the request receiving unit 20 receives the reference point information obtaining request, Determining, according to information about the short-distance reference point in the vicinity of the mobile terminal, the information about the short-distance reference point in the vicinity of the mobile terminal, and the information sending unit 24, Returning the reference point information to the mobile terminal after the reference point determining unit 22 determines the reference point information, so that the mobile terminal determines according to the reference point information A measurement reference point for positioning is obtained, and a position of the mobile terminal is obtained according to the measurement reference point. The reference point information determined by the reference point determining unit 22 includes one or more of a location of the reference point, a carrier frequency, a modulation and coding mode, and a device identifier. Of course, the foregoing embodiment may also be .

 Wherein, when the reference point information acquisition request received by the request receiving unit 20 may include the cell information in which the mobile terminal is currently located and the historical location information of the mobile terminal, the reference point determining unit 22 is further configured to use the Information about a short-distance reference point in the vicinity of the mobile terminal determined by the cell information in which the mobile terminal is currently located and the historical location information of the mobile terminal, and generating reference point information according to the information of the short-distance reference point.

 When the reference point information determined by the reference point determining unit 22 may include fixed reference point information and moving reference point information, as shown in FIG. 6, the reference point determining unit 22 includes: a grouping module 220, configured to obtain a plurality of mobile terminals. Location information, and grouping according to the location information of the mobile terminal, where the mobile terminals with similar geographical locations are grouped into one group; the reference point determining module 222 is configured to determine, after the grouping module 220 determines the group to which the mobile terminal belongs And determining, according to the cell information or location information that the mobile terminal is currently located, and the information of the short-distance reference point near the mobile terminal determined by the group to which the mobile terminal belongs, the short-distance reference point includes a fixed reference point and the movement A mobile reference point composed of other mobile terminals of the group to which the terminal belongs.

 Certainly, when the reference point information includes the fixed reference point information and the mobile reference point information, the reference point determining unit may also not perform grouping, but use other mobile terminals in the vicinity of the mobile terminal as reference points and correspondingly transmit reference point information, by moving The terminal selects the applicable reference point from it.

 Further, when the mobile reference point is used, the network side may require the mobile terminal to periodically report the location information, so that the network side provides the mobile terminal as a mobile reference point to other mobile terminals for positioning. As shown in FIG. 7, the wireless network device 2 further includes: a period processing unit 26, configured to notify the mobile terminal of periodic location information.

 It can be understood that the mobile terminal in the embodiment of the present invention can obtain the reference point for positioning by using the network side, and the reference point is provided by the network side, and may be any network element of a known location in the current network. It greatly enriches the number of reference points when the mobile terminal performs reference point positioning, improves the positioning accuracy, and can be used in various environments indoors and outdoors.

Meanwhile, in the above embodiment, the GNSS positioning and the reference point positioning technology are also collected. It is ensured that the mobile terminal can be converted between the two positioning modes under appropriate conditions, so that the mobile terminal can select the most suitable positioning mode according to the environmental characteristics, and further improve the positioning accuracy as a whole.

 On the other hand, the reference point is positioned in combination with the positioning method based on the mobile terminal, and the mobile terminal is used as a reference point, thereby improving the positioning capability in a complex environment.

 Various specific embodiments of the present invention are further described below in terms of a process flow of positioning. As shown in FIG. 8, a specific flow diagram of a positioning method of a mobile terminal in an implementation of the present invention includes:

 101. Send a reference point information acquisition request to the currently connected wireless network. The reference point information obtaining request may be an explicit cell reference point information request, or may be a location reporting information sent by the mobile terminal (the location reporting may be location information obtained based on other positioning methods), or may be a mobile terminal in the group service. The initiated group call establishment request and the like.

 Then, according to the specific situation of the specific transmission request, the reference point information acquisition request may include the cell information or location information currently in the mobile terminal, or the cell information and the historical location information of the mobile terminal.

 At the same time, before the step, the method further includes: searching for a GPS signal, and determining whether the GPS signal is lower than a measurement threshold, and when the determination result is yes, checking whether the reference point information is saved locally; when the reference is not locally When the information is clicked, step 101 is executed to send a reference point information acquisition request to the currently connected wireless network.

 102. Receive reference point information returned by the wireless network, where the reference point information includes a short-distance reference point in the vicinity of the mobile terminal determined by the wireless network according to cell information or location information currently in which the mobile terminal is currently located. information.

 The reference point information may include fixed reference point information and mobile reference point information, where the mobile reference point is another mobile terminal in the vicinity of the mobile terminal. Certainly, in a specific embodiment, the network side may first return the fixed reference point information, and then send the mobile reference point information in the next positioning; of course, the fixed and moving reference point information may also be returned according to the known situation on the network side.

 103. Determine a measurement reference point for positioning according to the reference point information, and obtain a location of the mobile terminal according to the measurement reference point.

In this step, different positioning methods can be used depending on the reference point. The measurement reference point may be two reference points, three reference points or more than three reference points. When the measurement reference point is two reference points, the obtaining the location of the mobile terminal according to the measurement reference point comprises: the mobile terminal separately measuring distances of the two reference points, and determining the Determining, by the mobile terminal, a position of the projection point as a position of the mobile terminal at a projection point of the connection between the two measurement reference points;

 When the measurement reference point is three or more reference points, obtaining the location of the mobile terminal according to the measurement reference point comprises: obtaining the according to the OTDOA method according to the three or three reference points The location of the mobile terminal.

 The specific details of the above positioning method have been described in the foregoing embodiments, and will not be described herein.

 Correspondingly, as shown in FIG. 9, FIG. 9 is a specific flowchart of another method for locating a mobile terminal according to an embodiment of the present invention, where the method includes:

 201. The wireless network side receives a reference point information acquisition request sent by the mobile terminal. The reference point information obtaining request may be an explicit cell reference point information request, or may be a location reporting information sent by the mobile terminal (the location reporting may be location information obtained based on other positioning methods), or may be a mobile terminal in the group service. The initiated group call establishment request and the like.

 The reference point information obtaining request may include cell information in which the mobile terminal is currently located, or may further include historical location information of the mobile terminal.

 202. The wireless network side has no information about a short-distance reference point in the vicinity of the mobile terminal determined according to the cell information currently in which the mobile terminal is currently located, and generates reference point information according to the information of the short-distance reference point. Specifically, the reference point information may include one or more of a location of the reference point, a carrier frequency, a modulation and coding mode, and a device identifier.

 When the reference point information acquisition request includes the cell information in which the mobile terminal is currently located and the historical location information of the mobile terminal, in this step, the wireless network side according to the cell information currently in the mobile terminal and the mobile The information of the short-distance reference point near the mobile terminal determined by the historical location information of the terminal.

The reference point information may include fixed reference point information and mobile reference point information, where the mobile reference point is another mobile terminal in the vicinity of the mobile terminal, and the packet process may be included in the step: the wireless network side obtains multiple Mobile terminal location information, and grouping according to the mobile terminal location information, where mobile terminals with similar geographical locations are grouped into groups; according to the mobile terminal Information about a short-distance reference point in the vicinity of the mobile terminal determined by the cell information (or location information) in which the mobile terminal is located, and the short-distance reference point includes a fixed reference point and a packet to which the mobile terminal belongs The other mobile terminals are composed of mobile reference points.

 Of course, in the case where the reference point information may include fixed reference point information and mobile reference point information, the wireless network device may also not perform grouping, but use other mobile terminals in the vicinity of the mobile terminal as moving reference points, and use these mobile references. The point information is sent to the mobile terminal.

 Meanwhile, for the case where the reference point information includes the mobile reference point information, before the step, the wireless network side may also notify the mobile terminal to periodically upload the location information. Of course, the mobile terminal that is notified may be a mobile terminal subordinate to the network element on the wireless network side.

 203. Return the reference point information to the mobile terminal, so that the mobile terminal determines a measurement reference point for positioning according to the reference point information, and obtains a location of the mobile terminal according to the measurement reference point.

 The foregoing describes the positioning method in the embodiment of the present invention from the mobile terminal side and the network side. In order to further illustrate the technical solution of the present invention, the specific network architecture is taken as an example to describe each device in the network during positioning. Interaction process.

 As shown in FIG. 10, in this embodiment, the network side is an Evolved Packet Core (EPC) network element (of course, it may be other types of core network elements, but in this example, an EPC is taken as an example). The reference point allocation is performed, and the terminal preferentially determines whether GPS positioning can be used when performing positioning, and the process includes the following steps:

 301. A user equipment (User Equipment, UE) starts a location service.

 302. The UE preferentially searches for the GPS signal. If the GPS signal is lower than the corresponding threshold and cannot be used for precise positioning, it is checked whether the locally saved reference point list is empty: if the reference point list is not empty, it indicates that the GPS signal can be utilized. The reference point is located, and step 309 is performed; if the reference point list is empty, the UE requests the reference point information of the local cell from the EPC.

 303-304: The UE sends a cell reference point information request to the EPC by using an evolved NodeB (eNB), and carries an identifier of the current cell (Identification, ID) and a recently measured location information record, requesting all the cells in the cell. Reference point information. Of course, the location information may not be carried. If the UE has no history information record of the location, the location information does not need to be carried in the signaling.

305. The EPC searches for available reference point information according to the cell ID and location information of the UE. 306-307, the EPC sends the reference point information (fixed reference point or mobile reference point, or both) that can assist the UE to locate by the eNB responding to the request information of the UE. The reference point information may include a carrier frequency, a modulation and coding scheme, an ID, and the like.

 308-309, according to the locally maintained reference point information list, search for available reference points, and measure the time delay of the reference point to reach the UE. Three reference points, two reference points or one reference point positioning can be selected based on the accuracy requirement and the actual scene.

 310. Calculate the accurate position of the UE by using the time delay value measured from the reference point. When the number of reference points is greater than three, the calculation method of the hyperbola in the OTDOA is adopted, and when the number of reference points is two, the calculation in FIG. 2 is adopted. In the method, when the number of reference points is only one time, the position of the UE is replaced by the position of the reference point.

 As shown in FIG. 11, in this embodiment, after the UE performs positioning according to the prior art, the UE sends the positioning result to the EPC and triggers the reference point positioning process. It includes the following steps:

 401. The UE performs positioning (or referred to as providing location service) by using a base station or a GPS-based positioning method.

 402-403, the UE performs location reporting by using the eNB, and reports the result of the location in step 401 to

EPC.

 404-405, the EPC detects whether there is a positioning reference point available according to the location of the UE, and if so, the reference point information is summarized and sent to the UE. The reference point information includes reference point position, frequency, modulation coding mode, reference point ID, and the like.

 407. The UE updates the reference point list according to the received reference point information. If the positioning method satisfies the reference point-based mode jump condition, such as a reference point information that can search for a sufficient number of auxiliary positioning, the UE measures the reference point in the reference point list, and selects the short-distance reference point for the reference point-based positioning.

 408. Measure the delay of the UE to the reference point based on the reference point location.

 409-411, calculate the position of the UE and measure the result.

As shown in FIG. 12, in the embodiment of the present invention, positioning is performed by combining a fixed reference point and a mobile reference point; and in this example, the EPC groups the UE. At this point, the UE can maintain two lists: a fixed reference point list and a mobile reference point list. The UE may determine the location of the mobile UE by using a fixed reference point of the known location, and the UE needs to maintain a fixed reference point list internally; when the UE cannot search for a fixed reference point or searches for a less fixed reference point, the mobile UE may be adopted. The pass-through mode (moving reference point) assists in positioning, so the UE needs to maintain a list of moving reference points. A hybrid positioning is initiated using a list of mobile reference points stored within the UE. The process is shown in Figure 12 and includes the following steps:

 501. The group UE initiates a positioning request based on the reference point, and requests the surrounding fixed reference point information from the EPC.

 502. The EPC responds to the UE request, and sends a 'fixed reference point information, including frequency, modulation coding mode, ID, and the like, so that the UE can quickly locate.

 503. The UE updates the fixed reference point list maintained, and saves the received reference point information (frequency, modulation and coding mode, ID, etc.).

 504-506, the EPC periodic location request times out, and the UE is requested to measure the location information. That is, the UE reports the location reported by the network side.

 507-508, the UE initiates the location measurement based on the reference point. For the UE that applies the group location measurement for the first time, it does not obtain the location information of the neighboring UE, so its mobile reference point list is empty, and only the fixed reference point list is available. Search for reference points for precise position measurement based on reference points.

 509. The UE measures the location based on the fixed reference point.

 510-511, the UE location is only 艮.

 512. The EPC aggregates the received group location information (that is, the location information reported by each UE in the group), and groups the UEs according to the geographical relationship, and groups the geographical proximity into a group, for example, the grouping result is :

 Group 1 includes: UE1 location, UE2 location, ...

 Group 2 includes: UEm location, UEm+1 location, ....

 513-514, the EPC performs group location and group information delivery, so that the UE can obtain neighbor UE information from the packet information.

 515. After receiving the location information and the group information of the group, the UE stores the location information of the group, and adjusts the mobile UE list according to the group information, and updates the mobile UE list to the same group of UEs.

 516-519, adopting a process similar to 504~507, when the EPC periodic location request times out, the UE is ordered to measure the location information.

520. The UE searches for a fixed reference point list and a reference point in the mobile reference point list, performs reference point-based positioning, and defaults to search for a fixed reference point list. When the number of fixed reference points is not met, Search for a list of mobile reference points.

 521-523. Read the positioning information of the fixed reference point, and read the broadcast information of the mobile reference point, initiate a positioning request, and obtain positioning information. If the mobile reference point is accurately located, the neighboring UE is notified by the broadcast message, and the neighboring UE attempts to initiate a positioning request after reading the information, measures the time delay, and reads the location information of the mobile reference point for location calculation.

 524. Perform measurement based on the reference point using the measurement result.

 As shown in FIG. 13, in the embodiment of the present invention, the example similar to FIG. 12 also uses a combination of a fixed reference point and a mobile reference point for positioning, but in this example, the EPC does not group the UE, but receives it by the UE. After the group location information is selected, the UE with the close distance is selected as the mobile reference point, and the mobile reference point information list is updated. The process includes the following steps:

 601. The UE initiates a reference point-based positioning method, and requests surrounding fixed reference point information from the EPC.

602. The EPC responds to the UE request, and sends information about a fixed reference point in the vicinity of the UE, including information such as a frequency, a modulation and coding mode, and an ID, so that the UE can quickly locate.

 603. The UE updates the fixed reference point list maintained by the UE.

 604-606, the EPC periodic location request times out, and the UE is requested to measure the location information.

 607-608, the UE searches for the reference point for accurate position measurement based on the reference point, preferentially searches for the fixed reference point, and searches for the mobile reference point information in the moving reference point list when the fixed reference point does not satisfy the measurement requirement.

 609. Using reference point based positioning, which may be based on a fixed reference point or based on a moving reference point, or based on a hybrid positioning of a fixed reference point and a moving reference point.

 610. Calculate the UE location by using the measured delay value and the reference point position.

 611-614, the location of the UE is sent to the group location, and the EPC does not classify the group location. The group location is the location information of the UE delivered by the EPC according to the location information reported by each UE. That is, all UEs scattered everywhere report their location to the EPC, and the EPC organizes the locations of these UEs and delivers them to all UEs. This process allows each UE to know the location of other UEs, and can use the UE that is closer to itself to locate.

615. The UE searches for a UE that is relatively close (normally less than 50 m), and updates the mobile reference point list by using the UE information. For the case that the group has been grouped, for example, the terminal of all the public security personnel who are on the same out-of-office, the UE can also receive the location information of all the UEs in the same group, and combine the delivery. The location of other UEs in the group location further searches for UEs that are closer.

 In the embodiments described above with reference to Figures 12 and 13, the positioning of the reference point can be further referenced during positioning to improve the positioning capability in complex scenes. Especially in the case where the available fixed reference points are not enough, the positioning accuracy can be improved by means of nearby moving reference points. As shown in Figure 14, the group periodically performs the process of location reporting and EPC periodically sending group location information.

 701. The UE sends a group call setup request, where the group call setup request carries a periodic location request, where the location delivery period is Τ, and T can be 5s, 10s, 30s, lmin, 10min, 30min, and the like.

 702. Authenticate the user identity, and determine whether to allow the group call to be established.

 703. The cluster UE or the group call initiated by the dispatching station is established.

 704. The group call establishes a response.

 705-706, the EPC notifies the UE of the location period through the NAS protocol or the application layer protocol, and the UE initializes the 'periodic location measurement and reporting clock after receiving the value.

 707. The EPC delivers a 'group location reporting period, and after the command, initializes the group group location broadcast timer after the delay dt, regardless of signaling transmission and decoding delay, 'UE location measurement and reporting timer, and 'Group location broadcast timer, the delay difference dt, the UE will measure and report its own position information in dt time, dt can choose T/2, 3Τ/4, etc.

 708-709, after the timeout request of the UE is timed out, the location measurement operation of the UE is started; 710. The measured UE location information is reported;

 711, EPC's group location broadcast timer, after receiving the timeout, the received group location information is sent;

712-712, the EPC periodically broadcasts the group location information to the cluster UE.

 In the embodiment of the present invention, a specific scheme for reporting and delivering a periodic group location is provided, and a corresponding signaling procedure is illustrated. It is better to obtain the information of the available mobile reference points in the scene with the mobile reference point for positioning.

 In summary, by adopting the solution in the embodiment of the present invention, accurate positioning of the GPS signal in the room can not be covered; and, in the embodiment of the present invention, the GPS positioning and the reference point based positioning can be performed. Quickly switch between.

Further, in the embodiment of the present invention, the reference point information adjacent to the UE may be sent. The fast reference point search, that is, the network sends a reference point list near the UE, so that the UE can quickly find the available reference point location. At this time, the UE may not have any information, and a blind search reference point needs to be performed. For the group positioning situation, the UEs that are geographically close to each other are grouped by the EPC, or the UE searches for the neighboring UEs according to the group information, updates the mobile reference point list, and assists the fixed reference point positioning.

 A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. In execution, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

 The above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and the equivalent changes made in the claims of the present invention are still within the scope of the present invention.

Claims

Rights request 1. A positioning method for a mobile terminal, characterized in that the method includes: Send a reference point information acquisition request to the currently connected wireless network; Receive reference point information returned by the wireless network, where the reference point information includes information about short-distance reference points near the mobile terminal determined by the wireless network based on cell information and/or location information where the mobile terminal is currently located. ; A measurement reference point for positioning is determined based on the reference point information, and the position of the mobile terminal is obtained based on the measurement reference point. 2. The method according to claim 1, characterized in that, When the measurement reference points are two reference points, obtaining the position of the mobile terminal based on the measurement reference points includes: The mobile terminal measures the distance between the mobile terminal and the two reference points respectively, determines the projection point of the mobile terminal on the line connecting the two measurement reference points, and determines the position of the projection point as the Describe the location of the mobile terminal; When the measurement reference points are three or more reference points, obtaining the position of the mobile terminal based on the measurement reference points includes: The position of the mobile terminal is obtained according to the observable time difference of arrival OTDOA method according to the three or three reference points. 3. The method according to claim 1 or 2, wherein the reference point information acquisition request includes cell information where the mobile terminal is currently located and historical location information of the mobile terminal. 4. The method of claim 1, 2, or 3, wherein sending a reference point information acquisition request to the currently connected wireless network includes: Search for the global positioning system GPS signal, and determine whether the GPS signal is lower than the measurement threshold value. When the determination result is yes, check whether the mobile terminal stores reference point information; When the mobile terminal does not save the reference point information, it sends a reference point information acquisition request to the currently connected wireless network. 5. The method according to any one of claims 1 to 4, wherein the reference point information includes fixed reference point information and moving reference point information, and the moving reference point is the mobile terminal. other nearby mobile terminals. 6. A positioning method for a mobile terminal, characterized in that the method includes: The wireless network side receives the reference point information acquisition request sent by the mobile terminal; The wireless network side determines information about short-distance reference points near the mobile terminal based on the cell information and/or location information where the mobile terminal is currently located, and generates reference point information based on the information about the short-distance reference points. ; The reference point information is returned to the mobile terminal, so that the mobile terminal determines a measurement reference point for positioning based on the reference point information, and obtains the position of the mobile terminal based on the measurement reference point. 7. The method of claim 6, wherein the reference point information acquisition request includes cell information where the mobile terminal is currently located and/or historical location information of the mobile terminal, wherein, the mobile terminal The historical location information of the terminal is the location information; The wireless network side determines the information of the short-distance reference point near the mobile terminal based on the cell information or location information where the mobile terminal is currently located, including: the wireless network side determines the information of the cell where the mobile terminal is currently located based on the cell information or location information where the mobile terminal is currently located. and/or historical location information of the mobile terminal, information that determines short-distance reference points near the mobile terminal. 8. The method according to claim 6 or 7, wherein the reference point information includes one or more of the position, carrier frequency, modulation and coding method, and device identification of the short-distance reference point. 9. The method according to any one of claims 6 to 8, characterized in that the reference point information includes fixed reference point information and moving reference point information, and the moving reference point is other information near the mobile terminal. For a mobile terminal, the wireless network side determines the information of a short-distance reference point near the mobile terminal based on the cell information and/or location information where the mobile terminal is currently located, including: The wireless network side obtains the location information of multiple other mobile terminals and groups them according to the location information of the other mobile terminals, where the other mobile terminals are a group of mobile terminals with similar geographical locations; Determine the information of the short-distance reference point according to the cell information and/or location information where the other mobile terminal is currently located, and the group to which the other mobile terminal belongs, where the short-distance reference point includes the fixed reference point and the All the groups composed of the group of mobile terminals to which the other mobile terminals belong to move the reference point. 10. The method according to any one of claims 6 to 9, characterized in that the method further includes: The wireless network side notifies the mobile terminal of periodic location information. 11. A mobile terminal, characterized in that, the mobile terminal includes: A request sending unit, configured to send a reference point information acquisition request to the currently connected wireless network; an information receiving unit, configured to receive the reference point information returned by the wireless network after the request sending unit sends the reference point information acquisition request. , the reference point information includes information about short-distance reference points near the mobile terminal determined by the wireless network based on cell information and/or location information where the mobile terminal is currently located; A positioning unit, configured to determine a measurement reference point for positioning based on the reference point information received by the information receiving unit, and obtain the position of the mobile terminal based on the measurement reference point. 12. The mobile terminal according to claim 11, characterized in that, The positioning unit is specifically configured to measure distances from the mobile terminal to the two reference points when the measurement reference points are two reference points, and determine where the mobile terminal is at the two measurement reference points. The projection point of the connection line determines the position of the projection point as the position of the mobile terminal; the positioning unit is specifically used to determine the position of the projection point according to the three reference points when the measurement reference points are three or more reference points. One or three reference points are used to obtain the position of the mobile terminal according to the OTDOA method. 13. The mobile terminal according to claim 11 or 12, wherein the reference point information acquisition request sent by the request sending unit includes cell information where the mobile terminal is currently located and historical location information of the mobile terminal. . 14. The method according to claim 11 or 12 or 13, characterized in that the request sending unit includes: GPS positioning unit, used to search for GPS signals, and determine whether the GPS signal is lower than the measurement threshold value. When the judgment result is yes, check whether the mobile terminal saves reference point information; reference point positioning unit, used When the GPS positioning unit confirms that the mobile terminal does not save the reference point information, it sends a reference point information acquisition request to the currently connected wireless network. 15. The mobile terminal according to any one of claims 11 to 14, wherein the reference point information received by the information receiving unit includes fixed reference point information and mobile reference point information, so The mobile reference points are other mobile terminals near the mobile terminal. 16. A wireless network device, characterized in that, the wireless network device includes: a request receiving unit, configured to receive a reference point information acquisition request sent by a mobile terminal; a reference point determination unit, configured to receive in the request receiving unit After receiving the reference point information acquisition request, determine the information of short-distance reference points near the mobile terminal based on the cell information and/or location information where the mobile terminal is currently located, and generate information based on the information of the short-distance reference points. Reference point information; An information sending unit, configured to return the reference point information to the mobile terminal after the reference point determination unit determines the reference point information, so that the mobile terminal determines a measurement reference for positioning based on the reference point information. point, and obtain the position of the mobile terminal according to the measurement reference point. 17. The wireless network device according to claim 16, wherein the reference point information acquisition request received by the request receiving unit includes cell information where the mobile terminal is currently located and the historical location of the mobile terminal. information; The reference point determination unit is also configured to determine the information of the short-distance reference point near the mobile terminal based on the cell information where the mobile terminal is currently located and the historical location information of the mobile terminal, and determine the information of the short-distance reference point based on the short-distance reference Point information generates reference point information. 18. The wireless network device according to claim 16 or 17, wherein the reference point information determined by the reference point determination unit includes the position, carrier frequency, modulation and coding method of the short-distance reference point, and One or more of the device identifiers. 19. The wireless network device according to any one of claims 16 to 18, wherein the reference point information determined by the reference point determination unit includes fixed reference point information and mobile reference point information, and the mobile reference point information is The reference points are other mobile terminals near the mobile terminal, and the reference point determination unit includes: A grouping module, configured to obtain location information of multiple other mobile terminals and group them according to the location information of the other mobile terminals to obtain a group of mobile terminals with similar geographical locations; A reference point determination module, configured to determine the group of mobile terminals based on the cell information and/or location information where the other mobile terminals are currently located, and the group to which the other mobile terminals belong, after the grouping module determines the group of mobile terminals. Information about short-distance reference points. The short-distance reference points include the fixed reference points and the mobile parameters composed of the group of mobile terminals to which the other mobile terminals belong. Test points. 20. The wireless network device according to any one of claims 16 to 19, characterized in that the wireless network device further includes: A periodic processing unit, configured to notify the mobile terminal of location information periodically. 21. The wireless network device according to any one of claims 16 to 20, characterized in that the wireless network device is an evolved packet core network device.