CN108012323B - Terminal positioning method and device based on narrowband Internet of things - Google Patents
Terminal positioning method and device based on narrowband Internet of things Download PDFInfo
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- CN108012323B CN108012323B CN201610942934.6A CN201610942934A CN108012323B CN 108012323 B CN108012323 B CN 108012323B CN 201610942934 A CN201610942934 A CN 201610942934A CN 108012323 B CN108012323 B CN 108012323B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention relates to the field of wireless communication, in particular to a terminal positioning method and a device of a narrowband Internet of things, wherein a positioning server respectively receives time offset values respectively sent by at least three base stations corresponding to a terminal, wherein the time offset value sent by one base station represents the offset value of the receiving time of an access message received by the one base station and the starting time of a wireless frame header of the one base station, and the access message is sent to the one base station by the terminal based on a positioning request; the positioning server calculates the position of the terminal based on the respective position information of the at least three base stations and the received time offset values sent by the at least three base stations, so that the terminal sends access messages to the at least three base stations in turn, and positioning can be completed through the position information of the base stations and the time offset values, thereby avoiding power consumption of the terminal, ensuring positioning accuracy and avoiding new cost.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a terminal positioning method and device of a narrowband Internet of things.
Background
The Internet of Things is an important component of a new Generation of information technology and also an important development stage of the information era, the Internet of Things is an Internet with connected objects, and the narrowband Internet of Things (Narrow Band Internet of Things, NB-IoT) is a technical standard defined by the 3rd Generation Partnership Project (3 GPP) standardization organization, is a narrowband radio frequency technology specially designed for the Internet of Things, and is characterized by indoor coverage, low cost, low power consumption and wide connection. The positioning of the terminal under the narrowband Internet of things is realized, the terminal can be applied more, the management of the terminal can be satisfied, and the terminal is paid more and more attention. The current terminal positioning methods mainly include two categories: 1) for the application scene of the terminal outdoors: satellite Positioning based on Global Positioning System (GPS) and outdoor Positioning based on a macro station; 2) for the indoor application scene of the terminal: mainly comprises indoor positioning based on small stations and indoor positioning based on short-distance technology.
However, these positioning methods have certain disadvantages.
1) Satellite positioning methods based on GPS and the like.
The initial satellite search time is long (about 5 minutes), the power consumption is high, the service life of the NB-IoT terminal is short (the NB-IoT terminal can only be positioned for about 50 times), the service life requirement of the terminal cannot be met, and the terminal is required to be chargeable due to high power consumption and high power consumption, so that the terminal cost is increased.
Further, if the auxiliary positioning information is added, although the satellite search time can be accelerated, due to the low downlink rate of NB-IoT, the time required for transmitting the ephemeris information for assisting satellite search is long, for example, about 8 seconds is required at the edge of a cell, and the time is longer than the update period (5 seconds) of the GPS ephemeris information, which may result in long satellite search time and large power consumption, and also may result in that the service life of the NB-IoT terminal cannot meet the service life requirement, and it needs to be chargeable, which increases the terminal cost.
2) A method for macro station based outdoor positioning.
The outdoor positioning based on the macro station mainly comprises the following schemes: A) Cell-ID (Cell-ID); B) angle of Arrival (Angle of Arrival, AOA) + Timing Advance (TA); C) Uplink-Time Difference of Arrival (UTDOA).
A) Cell-ID is positioned based on the ID of the Cell where the terminal is located, the positioning accuracy is about 500-1000 m, and the accuracy error is large.
B) The maximum number of 2 NB-IOT network antennas is 2, so that accurate azimuth information cannot be obtained, AOA cannot be used, and AOA + TA cannot be used.
C) UTDOA requires a terminal to send an access request message to different base stations at a time, requires multiple base stations to receive simultaneously, is not easy to implement due to limited bandwidth, and requires to define a special positioning pilot, and the mechanism is not defined in NB-IOT protocol at present.
3) A method for indoor positioning based on small stations.
The method needs a low-power base station, such as a Pico Radio Remote Unit (PicoRRU), to be deployed indoors, and the positioning accuracy is related to the deployment density of the low-power base station, for example, under the current general deployment density, the positioning accuracy is about 50 meters to 100 meters, but this positioning method needs to deploy a small connected station indoors, and needs to increase the deployment cost of a special indoor station.
4) A method for indoor positioning based on short-distance technology.
The method needs short-distance technologies, such as bluetooth and Radio Frequency Identification (RFID), deployed indoors, and the positioning accuracy is related to the deployment density, and the corresponding cost of network device deployment in the short-distance technologies needs to be increased.
Therefore, in the prior art, the positioning method of the terminal cannot reduce power consumption and cost under the condition of ensuring precision.
Disclosure of Invention
The embodiment of the invention provides a terminal positioning method and device of a narrowband Internet of things, and aims to solve the problems that in the prior art, power consumption and cost cannot be reduced under the condition that precision cannot be guaranteed.
The embodiment of the invention provides the following specific technical scheme:
a terminal positioning method of a narrowband Internet of things comprises the following steps:
the terminal sequentially sends access messages to at least three base stations corresponding to the terminal;
and when the terminal receives the confirmation information sent by the positioning server, the positioning server is determined to finish positioning the terminal.
Preferably, the at least three base stations corresponding to the terminal are a base station of the local cell of the terminal and base stations of at least two neighboring cells of the terminal, respectively.
Preferably, the sequentially sending, by the terminal, the access messages to the at least three base stations corresponding to the terminal specifically includes:
a terminal sends an access message to a base station of a local cell of the terminal, and records the offset time between the time of sending the access message and the starting time of a wireless frame header of the terminal;
and the terminal respectively sends access messages to the base stations of at least two adjacent cells of the terminal at the offset time with the starting time of the wireless frame head of the terminal according to the offset time.
Preferably, further comprising:
and when the terminal determines that the base station of the cell is successfully accessed, reporting the terminal identification to the base station of the cell, and when determining that the base stations of the at least two adjacent cells are successfully accessed, reporting the terminal identification to the base stations of the at least two adjacent cells of the terminal at the offset time of the starting time of the wireless frame header of the terminal.
A terminal positioning method of a narrowband Internet of things comprises the following steps:
the positioning server respectively receives time offset values sent by at least three base stations corresponding to the terminal, wherein the time offset value sent by one base station represents the offset value of the receiving time of the access message received by the one base station and the starting time of a wireless frame header of the one base station, and the access message is sent to the one base station by the terminal;
and the positioning server calculates the position of the terminal based on the position information of the at least three base stations and the received time offset values sent by the at least three base stations.
Preferably, the at least three base stations corresponding to the terminal are a base station of the local cell of the terminal and base stations of at least two neighboring cells of the terminal, respectively.
Preferably, before calculating the position of the terminal, the method further includes:
respectively receiving terminal identifications respectively sent by at least three base stations corresponding to the terminal;
and when the terminal identifications sent by the at least three base stations are determined to be the same and the at least three base stations are different, sending an acknowledgement character ACK to the terminal.
Preferably, the calculating, by the positioning server, the position of the terminal based on the respective position information of the at least three base stations and the received time offset value sent by the at least three base stations includes:
and the positioning server calculates the position of the terminal by adopting a preset three-point positioning method based on the respective position information of the at least three base stations and the received time offset values respectively sent by the at least three base stations.
Preferably, further comprising:
and the positioning server reports the position of the terminal and the terminal identification to the positioning demand party.
A terminal positioning device of a narrowband Internet of things comprises:
a sending unit, configured to send access messages to at least three base stations corresponding to the apparatus in sequence;
and the determining unit is used for determining that the positioning server finishes positioning the device when receiving the confirmation information sent by the positioning server.
Preferably, the at least three base stations corresponding to the apparatus are a base station of a cell of the apparatus and base stations of at least two neighboring cells of the apparatus, respectively.
Preferably, when the access message is sequentially sent to at least three base stations corresponding to the apparatus, the sending unit is specifically configured to:
sending an access message to a base station of a local cell of the device, and recording offset time between the time of sending the access message and the starting time of a wireless frame header of the device;
and respectively sending access messages to the base stations of at least two adjacent cells of the device at the offset time with the starting time of the wireless frame header of the device according to the offset time.
Preferably, the sending unit is further configured to:
and reporting the device identifications to the base station of the local cell when the base station of the local cell is successfully accessed, and reporting the device identifications to the base stations of the at least two adjacent cells of the device at the offset time of the starting time of the wireless frame header of the device respectively when the base stations of the at least two adjacent cells are successfully accessed.
A terminal positioning device of a narrowband Internet of things comprises:
a receiving unit, configured to receive time offset values sent by at least three base stations corresponding to a terminal, respectively, where a time offset value sent by one base station indicates an offset value between a receiving time when the one base station receives an access message and a start time of a radio frame header of the one base station, and the access message is sent to the one base station by the terminal;
and the calculating unit is used for calculating the position of the terminal based on the position information of the at least three base stations and the received time offset values sent by the at least three base stations.
Preferably, the at least three base stations corresponding to the terminal are a base station of the local cell of the terminal and base stations of at least two neighboring cells of the terminal, respectively.
Preferably, before calculating the position of the terminal, the receiving unit is further configured to: respectively receiving terminal identifications respectively sent by at least three base stations corresponding to the terminal;
and the sending unit is used for sending an acknowledgement character ACK to the terminal when the terminal identifications sent by the at least three base stations are determined to be the same and the at least three base stations are different.
Preferably, when the position of the terminal is calculated based on the respective position information of the at least three base stations and the received time offset values sent by the at least three base stations, the calculating unit is specifically configured to:
and calculating the position of the terminal by adopting a preset three-point positioning method based on the respective position information of the at least three base stations and the received time offset values sent by the at least three base stations.
Preferably, the sending unit is further configured to:
and reporting the position of the terminal and the terminal identification to a positioning demand party.
In the embodiment of the invention, a positioning server sends a positioning request to a terminal; the positioning server receives time offset values respectively sent by at least three base stations corresponding to the terminal, wherein the time offset value sent by one base station indicates the offset value of the receiving time of the access message received by the one base station and the starting time of the radio frame header of the one base station, and the access message is sent to the one base station by the terminal based on the positioning request; the positioning server calculates the position of the terminal based on the respective position information of the at least three base stations and the received time offset values respectively sent by the at least three base stations, so that the terminal sends access messages to the at least three base stations in turn instead of sending the access messages at one time, and the method does not need to occupy larger bandwidth and is easier to realize; and the positioning server calculates the position of the terminal according to the position information and the time deviation values of the at least three base stations to complete positioning, so that the power consumption of the terminal is avoided, the positioning precision can be ensured, and the deployment cost of network equipment does not need to be newly increased.
Drawings
Fig. 1 is a flowchart illustrating an overview of a terminal positioning method for positioning a narrowband internet of things on a server side in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a three-point positioning method according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating an overview of a terminal positioning method of a narrowband internet of things on a terminal side in an embodiment of the present invention;
fig. 4 is a detailed flowchart of a terminal positioning method of a narrowband internet of things in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a terminal positioning device of a narrowband internet of things at a positioning server side in the embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal positioning device of a narrowband internet of things on a terminal side in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and 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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the problem that power consumption and cost cannot be reduced under the condition of ensuring precision in the prior art, in the embodiment of the invention, after a positioning server sends a positioning request to a terminal, the terminal sends access messages to at least three base stations in sequence, then the base stations report time deviation values to the positioning server, and the positioning server calculates the position of the terminal based on respective position information of the at least three base stations and the respective time deviation values sent by the at least three base stations to complete positioning.
The present invention will be described in detail with reference to specific examples, but it is to be understood that the present invention is not limited to the examples.
Referring to fig. 1, in the embodiment of the present invention, a specific process of a terminal positioning method of a narrowband internet of things at a positioning server side is as follows:
step 100: the positioning server sends a positioning request to the terminal.
In practice, when a location demander needs to locate a certain terminal, the location demander sends a location requirement to the location server, and the location server sends a location request to the terminal.
Step 110: the positioning server receives time offset values respectively sent by at least three base stations corresponding to the terminal, wherein the time offset value sent by one base station indicates the offset value of the receiving time of the access message received by the one base station and the starting time of the radio frame header of the one base station, and the access message is sent to the one base station by the terminal based on the positioning request.
The at least three base stations corresponding to the terminal are respectively a base station of the cell of the terminal and base stations of at least two adjacent cells of the terminal.
When step 110 is executed, specifically:
1) firstly, after receiving a positioning request, a terminal sends an access message to a base station of the cell.
The method specifically comprises the following steps: the terminal application layer initiates access in the cell, for example, random access, and the terminal communication layer needs to record the offset time Tp between the transmission time of the access message msg1 and the start time of the radio frame header of the terminal.
Wherein, the accuracy of Tp time is at least 1 Ts, and Ts is 1/30.72 ns.
Here, the recording Tp is for the terminal to transmit at an offset time Tp from the start time of the radio frame header of the terminal when subsequently transmitting the access message to the base station in the neighboring cell, but not for the same radio frame header, where the period of the radio frame header is 5 ms.
2) Then, after receiving the access message msg1, the base station of the cell calculates a time offset value Tenb1, that is, an offset value between the receiving time of the access message received by the base station of the cell and the starting time of the radio frame header of the base station of the cell.
Wherein, the time precision of the Tenb1 is at least 1 Ts, and the Ts is 1/30.72 ns.
3) Then, after determining that the access is successful, the terminal sends a Radio Resource Control (RRC) connection request to the base station of the cell.
The access identifier carried in the RRC connection request is a preset positioning access identifier, for example, the EstablishmentCause is set to be mt-location.
Here, the preset positioning access identifier may be agreed in advance for the terminal and the base station, so that the base station may determine that the access reason of the RRC connection request initiated by the terminal is positioning, and the base station may perform subsequent operations accurately and timely.
Further, the RRC connection request needs to carry a terminal identifier, so that when the subsequent positioning server performs positioning calculation, it can be determined whether the time offset value sent by the base station is for the same terminal.
The terminal identifier is, for example, a Temporary Mobile Subscriber Identity (TMSI) or a terminal Temporary Identity (S-TMSI).
4) Then, after receiving the RRC connection request, if it is determined that the access identifier carried in the RRC connection request sent by the terminal is the preset positioning access identifier, the base station of the cell sends the terminal identifier in the RRC connection request and the calculated time offset value Tenb1 to the positioning server.
Further, after receiving the RRC connection request, the base station of the local cell sends an RRC connection setup message to the terminal, so as to save power and reduce signaling processes as much as possible, and after receiving the RRC connection setup message, the terminal replies to the completion of the RRC connection setup, and then immediately initiates an RRC connection release process.
5) Finally, the terminal selects at least adjacent cells from the adjacent cell relations in the cell broadcast, for example, the adjacent cells with the best signals are selected, and the access message is sent at the offset time Tp from the starting time of the wireless frame header of the terminal. Here, the access messages sent to the base stations of at least two neighboring cells are not sent at the same time.
The subsequent procedure is the same as the procedure of 2), 3), 4), for example, access messages are sent to the base stations of two adjacent cells, namely, adjacent cell 1 and adjacent cell 2, the adjacent cell 1 base station and the adjacent cell 2 base station respectively record time offset values Tenb2 and Tenb3, and when it is determined that the access identifier carried in the RRC connection request sent by the terminal is the preset positioning access identifier, the terminal identifier in the RRC connection request and the calculated time offset values Tenb2 and Tenb3 are sent to the positioning server respectively.
Wherein, Tenb2 is the offset value between the receiving time of the access message received by the base station of the adjacent cell 1 and the starting time of the wireless frame header of the base station of the adjacent cell 1; tenb3 is the offset value between the receiving time of the access message received by the base station of the neighboring cell 2 and the starting time of the radio frame header of the base station of the neighboring cell 2.
It should be noted that, the sequence of the step 5) is not necessarily after the step 2), 3), 4), and may be after any step 2), 3), or 4), and is not limited here for convenience of detailed description, that is, in the embodiment of the present invention, the terminal mainly transmits the access message to at least three base stations by turns with the uniform offset time Tp, and does not transmit the access message to at least three base stations at one time.
Step 120: the positioning server calculates the position of the terminal based on the position information of each of the at least three base stations and the received time offset values transmitted by each of the at least three base stations.
When step 120 is executed, specifically: and the positioning server calculates the position of the terminal by adopting a preset three-point positioning method based on the position information of the at least three base stations and the received time offset values sent by the at least three base stations.
For example, referring to fig. 2, three-point positioning means that three circles are drawn by taking the positions of three base stations as the center and taking the distance as the radius, and the intersection of the three circles is the position of the terminal.
The method specifically comprises the following steps: first, the distances from the terminal to the corresponding base station are calculated from Tenb1, Tenb2, and Tenb3, respectively.
Then, the respective positions of the three base stations are taken as the origin points, the distance from the terminal is taken as the radius, and the intersection point of the three circles is the position of the terminal.
Of course, other three-point positioning methods may be used, and the embodiments of the present invention are not limited thereto.
Further, the positioning server may also receive terminal identifiers sent by at least three base stations corresponding to the terminal, so that before performing step 120, when the positioning server determines that the terminal identifiers sent by the at least three base stations are the same and the at least three base stations are different, an Acknowledgement Character (ACK) is sent to the terminal.
If the positioning server determines that Tenb1, Tenb2, and Tenb3 are not from three different base stations or are not for the same terminal, the positioning server does not reply ACK to the terminal and cannot calculate the accurate terminal position. At this time, if the terminal does not receive the ACK, the terminal continues to find out the neighboring cell meeting the residence condition from the neighboring cell relation to access until the ACK is received, or all the cells meeting the residence condition have been traversed, wherein the signal strength sent to the base station of the neighboring cell by the terminal is greater than the preset threshold when the terminal meets the residence condition, and the terminal is judged to be accessible.
Further, the positioning server reports the position of the terminal and the terminal identification to the positioning demand party to complete positioning.
Referring to fig. 3, in the embodiment of the present invention, a specific process of a terminal positioning method of a narrowband internet of things at a terminal side is as follows:
step 300: the terminal sequentially sends access messages to at least three base stations corresponding to the terminal.
The at least three base stations corresponding to the terminal are respectively a base station of the cell of the terminal and base stations of at least two adjacent cells of the terminal.
When step 300 is executed, the method specifically includes:
firstly, the terminal sends the access message to the base station of the local cell of the terminal, and records the offset time between the time of sending the access message and the starting time of the wireless frame header of the terminal.
Wherein the time accuracy of the offset time is at least 1 sample time.
Then, the terminal sends access messages to the base stations of at least two adjacent areas of the terminal at the offset time with the starting time of the wireless frame head of the terminal according to the offset time.
Therefore, the terminal sends the access messages to the at least three base stations in turn, and the access messages are sent at the same position instead of once, so that the terminal does not need to occupy larger bandwidth and is easier to realize.
Further, when the terminal determines that the access with the base station of the cell is successful, the terminal identifier is reported to the base station of the cell, and when the access with the base stations of at least two neighboring cells is successful, the terminal identifier is reported to the base stations of at least two neighboring cells of the terminal at the offset time of the starting time of the wireless frame header of the terminal.
Step 310: and when the terminal receives the confirmation information sent by the positioning server, the positioning server is determined to finish positioning the terminal.
The position of the terminal is calculated by the positioning server based on the position information of the at least three base stations and the received time offset values sent by the at least three base stations; the time offset value transmitted by one base station represents the offset value between the receiving time of the access message received by the one base station and the starting time of the radio frame header of the one base station.
It should be noted that the terminal positioning method based on the narrowband internet of things at the terminal side is the same as the terminal positioning method based on the narrowband internet of things at the positioning server side, and therefore, detailed description is omitted in the embodiments of the present invention here.
In the embodiment of the invention, a terminal sequentially sends access messages to at least three base stations corresponding to the terminal; when the terminal receives the confirmation information sent by the positioning server, the positioning server is determined to finish positioning the terminal, so that the terminal sends the access information to at least three base stations in turn instead of sending the access information at one time, larger bandwidth does not need to be occupied, and the method is easier to realize.
And the positioning server calculates the position of the terminal according to the position information and the time deviation values of the at least three base stations to complete positioning, so that the power consumption of the terminal is avoided, the positioning precision can be ensured, and the deployment cost of network equipment does not need to be newly increased.
The above embodiments are further described in detail below using a specific application scenario. Specifically, referring to fig. 4, in the embodiment of the present invention, an execution process of the terminal positioning method of the narrowband internet of things is specifically as follows:
in the application scenario, the terminal sends access messages to the three base stations respectively, and the access mode of the terminal is random access.
Step 400: the positioning server sends a positioning request to the terminal.
Step 401: the terminal application layer initiates random access in the cell, namely, sends access information to the base station of the cell.
Further, after receiving the access message, the base station of the local cell calculates a time offset Tenb 1.
Step 402: and after the random access is successful, the terminal communication layer reports the terminal identification to the base station of the cell.
The method specifically comprises the following steps: and sending an RRC connection request to a base station of the cell, wherein the access identification carried in the RRC connection request is a preset positioning access identification and a preset terminal identification.
Step 403: and the base station of the cell reports the time deviation value Tenb1 and the terminal identification to the positioning server.
The method specifically comprises the following steps: and when determining that the access identifier carried in the received RRC connection request is a preset positioning access identifier, the base station of the cell reports the time deviation value Tenb1 and the terminal identifier to a positioning server.
Step 404: the terminal application layer initiates random access in the adjacent cell 1, that is, sends an access message to the base station of the adjacent cell 1.
Further, after receiving the access message, the base station of the neighboring cell 1 calculates a time offset value Tenb 2.
Step 405: and after the random access is successful, the terminal communication layer reports the terminal identification to the base station of the adjacent cell 1.
The method specifically comprises the following steps: and sending an RRC connection request to a base station of the adjacent cell 1, wherein an access identifier carried in the RRC connection request is a preset positioning access identifier and a preset terminal identifier.
Step 406: and the base station of the neighboring cell 1 reports the time offset value Tenb2 and the terminal identification to the positioning server.
The method specifically comprises the following steps: and when determining that the access identifier carried in the received RRC connection request is the preset positioning access identifier, the base station of the neighboring cell 1 reports the time offset value Tenb2 and the terminal identifier to the positioning server.
Step 407: the terminal application layer initiates random access in the neighboring cell 2, that is, sends an access message to the base station of the neighboring cell 2.
Further, after receiving the access message, the base station of the neighboring cell 2 calculates a time offset Tenb 3.
Step 408: and after the random access is successful, the terminal communication layer reports the terminal identification to the base station of the adjacent cell 2.
The method specifically comprises the following steps: and sending an RRC connection request to the base station of the adjacent cell 2, wherein the access identifier carried in the RRC connection request is a preset positioning access identifier and a preset terminal identifier.
Step 409: and the base station of the neighboring cell 2 reports the time offset value Tenb3 and the terminal identification to the positioning server.
The method specifically comprises the following steps: and when determining that the access identifier carried in the received RRC connection request is the preset positioning access identifier, the base station of the neighboring cell 2 reports the time offset value Tenb3 and the terminal identifier to the positioning server.
Step 410: and the positioning server sends ACK to the terminal to confirm that the positioning is finished.
The method specifically comprises the following steps: and the positioning server determines that the terminal identifications sent by the three base stations are the same, and sends ACK to the terminal when the three base stations are different.
Further, the location server calculates the location of the terminal based on the Tenb1, the Tenb2, the Tenb3 and the location information of the three base stations, and transmits the terminal identification and the calculated location of the terminal to the location demander.
Based on the above embodiments, referring to fig. 5, in an embodiment of the present invention, a terminal positioning device for positioning a narrowband internet of things on a server side specifically includes:
a receiving unit 50, configured to receive time offset values sent by at least three base stations corresponding to a terminal, respectively, where a time offset value sent by one base station indicates an offset value between a receiving time when the one base station receives an access message and a start time of a radio frame header of the one base station, where the access message is sent to the one base station by the terminal;
a calculating unit 51, configured to calculate a location of the terminal based on the location information of each of the at least three base stations and the received time offset values sent by each of the at least three base stations.
Preferably, the at least three base stations corresponding to the terminal are a base station of the local cell of the terminal and base stations of at least two neighboring cells of the terminal, respectively.
Preferably, before calculating the position of the terminal, the receiving unit 50 is further configured to: respectively receiving terminal identifications respectively sent by at least three base stations corresponding to the terminal;
a sending unit 52, configured to send an acknowledgement character ACK to the terminal when it is determined that the terminal identifiers sent by the at least three base stations are the same and the at least three base stations are different.
Preferably, when the position of the terminal is calculated based on the respective position information of the at least three base stations and the received time offset values sent by the at least three base stations, the calculating unit 51 is specifically configured to:
and calculating the position of the terminal by adopting a preset three-point positioning method based on the respective position information of the at least three base stations and the received time offset values sent by the at least three base stations.
Preferably, the sending unit 52 is further configured to:
and reporting the position of the terminal and the terminal identification to a positioning demand party.
Based on the above embodiments, referring to fig. 6, in an embodiment of the present invention, a terminal positioning device of a narrowband internet of things at a terminal side specifically includes:
a sending unit 60, configured to send access messages to at least three base stations corresponding to the apparatus in sequence;
the determining unit 61 is configured to determine that the positioning server has completed positioning the device when receiving the confirmation information sent by the positioning server.
Preferably, the at least three base stations corresponding to the apparatus are a base station of a cell of the apparatus and base stations of at least two neighboring cells of the apparatus, respectively.
Preferably, when sequentially sending the access message to at least three base stations corresponding to the apparatus, the sending unit 60 is specifically configured to:
sending an access message to a base station of a local cell of the device, and recording offset time between the time of sending the access message and the starting time of a wireless frame header of the device;
and respectively sending access messages to the base stations of at least two adjacent cells of the device at the offset time with the starting time of the wireless frame header of the device according to the offset time.
Preferably, the sending unit 60 is further configured to:
and reporting the device identifications to the base station of the local cell when the base station of the local cell is successfully accessed, and reporting the device identifications to the base stations of the at least two adjacent cells of the device at the offset time of the starting time of the wireless frame header of the device respectively when the base stations of the at least two adjacent cells are successfully accessed.
In summary, in the embodiments of the present invention, the positioning server receives time offset values sent by at least three base stations corresponding to the terminal, respectively, where the time offset value sent by one base station indicates an offset value between a receiving time when the one base station receives an access message and a starting time of a radio frame header of the one base station, and the access message is sent by the terminal to the one base station based on the positioning request; the positioning server calculates the position of the terminal based on the respective position information of the at least three base stations and the received time offset values respectively sent by the at least three base stations, so that the terminal sends access messages to the at least three base stations in turn instead of sending the access messages at one time, and the method does not need to occupy larger bandwidth and is easier to realize; and the positioning server calculates the position of the terminal according to the position information and the time deviation values of the at least three base stations to complete positioning, so that the power consumption of the terminal is avoided, the positioning precision can be ensured, and the deployment cost of network equipment does not need to be newly increased.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (14)
1. A terminal positioning method of a narrowband Internet of things is characterized by comprising the following steps:
a terminal sends an access message to a base station of a local cell of the terminal, and records the offset time between the time of sending the access message and the starting time of a wireless frame header of the terminal; the terminal sends access messages to base stations of at least two adjacent cells of the terminal at the offset time with the starting time of a wireless frame header of the terminal respectively according to the offset time;
when a terminal receives confirmation information sent by a positioning server, the terminal is determined to have completed positioning of the terminal by the positioning server, wherein the position of the terminal is calculated by the positioning server based on respective position information of a base station of a cell of the terminal and base stations of at least two adjacent cells of the terminal and based on received time offset values sent by the base station of the cell of the terminal and the base stations of at least two adjacent cells of the terminal, and the time offset value sent by one base station represents an offset value between the receiving time of receiving an access message by the one base station and the starting time of a radio frame header of the one base station.
2. The method of claim 1, further comprising:
and when the terminal determines that the base station of the cell is successfully accessed, reporting the terminal identification to the base station of the cell, and when determining that the base stations of the at least two adjacent cells are successfully accessed, reporting the terminal identification to the base stations of the at least two adjacent cells of the terminal at the offset time of the starting time of the wireless frame header of the terminal.
3. A terminal positioning method of a narrowband Internet of things is characterized by comprising the following steps:
the method comprises the steps that a positioning server respectively receives time offset values sent by at least three base stations corresponding to a terminal, wherein the time offset value sent by one base station indicates that the receiving time of an access message received by the one base station and the offset value of the starting time of a radio frame header of the one base station are offset values, the access message is the offset time of the time for sending the access message and the starting time of the radio frame header of the terminal when the terminal sends the access message to the base station of a local cell of the terminal, and the access message is sent to the base stations of at least two adjacent cells of the terminal at the offset time with the starting time of the radio frame header of the terminal according to the offset time;
and the positioning server calculates the position of the terminal based on the position information of the at least three base stations and the received time offset values sent by the at least three base stations.
4. The method of claim 3, wherein the at least three base stations corresponding to the terminal are a base station of a local cell of the terminal and base stations of at least two neighboring cells of the terminal, respectively.
5. The method of claim 3, wherein calculating the location of the terminal further comprises:
respectively receiving terminal identifications respectively sent by at least three base stations corresponding to the terminal;
and when the terminal identifications sent by the at least three base stations are determined to be the same and the at least three base stations are different, sending an acknowledgement character ACK to the terminal.
6. The method as claimed in claim 3, 4 or 5, wherein the calculating, by the positioning server, the position of the terminal based on the respective position information of the at least three base stations and the received time offset values sent by the at least three base stations specifically comprises:
and the positioning server calculates the position of the terminal by adopting a preset three-point positioning method based on the respective position information of the at least three base stations and the received time offset values respectively sent by the at least three base stations.
7. The method of claim 6, further comprising:
and the positioning server reports the position of the terminal and the terminal identification to the positioning demand party.
8. The utility model provides a terminal positioning device of narrowband thing networking which characterized in that includes:
a sending unit, configured to send an access message to a base station of a local cell of the device, and record offset time between time of sending the access message and starting time of a radio frame header of the device; the access message is sent to the base stations of at least two adjacent cells of the device at the offset time with the starting time of the wireless frame header of the device according to the offset time;
a determining unit, configured to determine that the positioning server has completed positioning the device when receiving acknowledgement information sent by a positioning server, where the position of the device is calculated by the positioning server based on respective position information of a base station of a cell of the device and base stations of at least two neighboring cells of the device, and based on received time offset values sent by the base station of the cell of the device and the base stations of at least two neighboring cells of the device, and a time offset value sent by one base station indicates an offset value between a receiving time when the one base station receives an access message and a starting time of a radio frame header of the one base station.
9. The apparatus of claim 8, wherein the sending unit is further to:
and reporting the device identifications to the base station of the local cell when the base station of the local cell is successfully accessed, and reporting the device identifications to the base stations of the at least two adjacent cells of the device at the offset time of the starting time of the wireless frame header of the device respectively when the base stations of the at least two adjacent cells are successfully accessed.
10. The utility model provides a terminal positioning device of narrowband thing networking which characterized in that includes:
a receiving unit, configured to receive time offset values sent by at least three base stations corresponding to a terminal, respectively, where a time offset value sent by one base station indicates that the time offset value indicates that the receiving time of an access message received by the one base station is offset from a start time of a radio frame header of the one base station, the access message is sent to the one base station by the terminal, and when the terminal sends the access message to a base station of a local cell of the terminal, the receiving unit records offset times of the time for sending the access message and the start time of the radio frame header of the terminal, and sends the access message to base stations of at least two neighboring cells of the terminal at offset times from the start time of the radio frame header of the terminal according to the offset times;
and the calculating unit is used for calculating the position of the terminal based on the position information of the at least three base stations and the received time offset values sent by the at least three base stations.
11. The apparatus of claim 10, wherein the at least three base stations corresponding to the terminal are a base station of a local cell of the terminal and base stations of at least two neighboring cells of the terminal, respectively.
12. The apparatus of claim 10, wherein prior to calculating the location of the terminal, the receiving unit is further configured to: respectively receiving terminal identifications respectively sent by at least three base stations corresponding to the terminal;
and the sending unit is used for sending an acknowledgement character ACK to the terminal when the terminal identifications sent by the at least three base stations are determined to be the same and the at least three base stations are different.
13. The apparatus according to claim 10, 11 or 12, wherein when calculating the position of the terminal based on the position information of each of the at least three base stations and the received time offset values sent by each of the at least three base stations, the calculating unit is specifically configured to:
and calculating the position of the terminal by adopting a preset three-point positioning method based on the respective position information of the at least three base stations and the received time offset values sent by the at least three base stations.
14. The apparatus of claim 13, wherein the sending unit is further to:
and reporting the position of the terminal and the terminal identification to a positioning demand party.
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| CN109089205A (en) * | 2018-07-10 | 2018-12-25 | 青岛海尔智能家电科技有限公司 | System, method, apparatus and the computer storage medium of terminal positioning |
| CN109255407A (en) * | 2018-08-13 | 2019-01-22 | 广东南方电力通信有限公司 | Seamless positioning method inside and outside a kind of electric power storehouse raw material storehouse based on RFID and NB-IOT |
| CN109413573B (en) * | 2018-11-23 | 2020-09-04 | 武汉虹信通信技术有限责任公司 | Internet of things terminal positioning method and device |
| CN111669749B (en) * | 2019-03-06 | 2023-08-01 | 中国移动通信有限公司研究院 | Positioning processing method, MEC server and base station |
| CN113068127B (en) * | 2021-02-23 | 2022-08-19 | 中睿通信规划设计有限公司 | Positioning method of NB-IoT terminal |
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