KR101638745B1 - Long Term Evolution based Location Based Service System - Google Patents

Long Term Evolution based Location Based Service System Download PDF

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KR101638745B1
KR101638745B1 KR1020150131298A KR20150131298A KR101638745B1 KR 101638745 B1 KR101638745 B1 KR 101638745B1 KR 1020150131298 A KR1020150131298 A KR 1020150131298A KR 20150131298 A KR20150131298 A KR 20150131298A KR 101638745 B1 KR101638745 B1 KR 101638745B1
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signal
lte
unit
synchronization signal
terminal
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KR1020150131298A
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Korean (ko)
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심준형
박종호
우대호
구환모
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에스케이텔레시스 주식회사
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • 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
    • H04W64/003—Locating users or terminals or network equipment for network management purposes, e.g. mobility management locating network equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2211/00—Orthogonal indexing scheme relating to orthogonal multiplex systems
    • H04J2211/003—Orthogonal indexing scheme relating to orthogonal multiplex systems within particular systems or standards
    • H04J2211/005—Long term evolution [LTE]

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention relates to a LTE-based LBS service providing system, and more particularly, to a LTE-based LBS service providing system, in which a terminal for performing location registration when moving, a base station for providing an LTE service signal to the terminal, An LD (Location Detection) server for storing and managing location information including an installation location of the BS and an installation location of the RS, and a relay When the terminal performs the location registration, receives the location information of the repeater relaying the communication between the terminal and the base station from the LD server, generates the LD signal including the location information of the repeater, And an LD generation device for combining the LTE-DL signal and the LTE-DL signal, the repeater comprising: an LTE- And transmitting the DL signal to the terminal.

Description

[0001] The present invention relates to an LTE based LBS service providing system,

The present invention relates to an LTE based LBS service providing system.

2. Description of the Related Art [0002] With the rapid development of electronic communication technology, various wireless communication services using a wireless network have been provided. Accordingly, a service provided by a mobile communication system using a wireless communication network is being developed as a multimedia communication service for transmitting packet data as well as voice service.

Among various wireless Internet services using a terminal, a location based service (LBS) has been greatly attracted to a wide use and convenience.

The location-based service refers to a communication service that grasps the location of a mobile communication terminal such as a mobile phone and a personal digital assistant (PDA), and provides additional information in association with the detected location.

A positioning technique for providing a location-based service includes a network-based method of confirming a position by software using a propagation environment which is a cell radius of a base station of a mobile communication network, and a GPS receiver A handset based method using a hybrid method, and a hybrid method using both methods.

Among them, network-based positioning technology is widely used in shaded areas where the propagation of GPS is insufficient.

In this example, Korean Patent Laid-Open No. 10-2010-0021747 receives a location request transmitted from a terminal, identifies a service base station and a neighbor base station for the terminal, confirms at least one subway history served by the service base station, The subway history of at least one subway and the distance to the adjacent base station are respectively calculated and the subway history of the smallest distance value among the calculated distance values is extracted from the selected one or more subway history, To the positioning server.

However, there is a problem that the positioning accuracy is lower than that of the ground when the station is installed in a subway station, an underground parking lot, a station within the building, or the like.

In addition, in the case of existing network-based positioning services, positioning is performed using the CDMA communication method. However, until 2018, the CDMA-based standard is aimed at the complete conversion to the LTE-based standard.

Accordingly, the present invention seeks to provide a location location service based on LTE.

As described above, the present invention aims at providing a position location service based on LTE while improving the accuracy of position location.

(LTE-UL) signal between the terminal and the base station in a specific region, and an LTE-DL (Long Term Evolution Uplink) signal between the base station and the base station in a specific region. An LD (Location Detection) server for storing and managing location information including an installation location of the base station and an installation location of the repeater, and a location registration server interworking with the relay, The mobile station receives the position information of the repeater relaying the communication between the terminal and the base station from the LD server, generates an LD signal including the position information of the repeater, and outputs the LD signal and the LTE- , And the repeater transmits the LTE-DL signal combined by the LD generation apparatus to the terminal Can be achieved by LTE-based LBS service providing system characterized in that the terminal group is a location registration.

The LD generating apparatus includes a first receiving unit for receiving an LTE-DL signal (Long Term Evolution Downlink Signal) from the base station or the repeater, a second receiving unit for receiving a combined value of a cell ID and an offset from the LD server, And a synchronization signal (SS) including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) included in a frame of the LTE-DL signal received by the first receiver, A synchronization signal delay unit for delaying the synchronization signal generated by the synchronization signal generation unit by the Offset value, a synchronization signal delay unit for delaying the synchronization signal generated by the synchronization signal generation unit by the Offset value, A map for forming a new frame of the same size as the frame of the LTE-DL signal received by the first receiver and mapping the synchronization signal delayed by the synchronization signal delay unit A converting unit for performing inverse fast Fourier transform on a new frame generated by the mapping unit, and a demodulator for demultiplexing the bandwidth of the new frame, which has been inversely Fourier transformed by the transforming unit, And a transmitter for combining the LD signal generated by filtering by the filter unit and the LTE-DL signal received by the first receiver and transmitting the combined signal to the repeater, .

The first receiving unit converts the LTE-DL signal into a digital signal having a sampling rate of at least 100 MHz or more.

The LD generation device is implemented as an FPGA (Field-Programmable Gate Array) module embedded in the repeater.

And the synchronization signal generation unit generates a synchronization signal at a level lower than a level of the LTE-DL signal received by the first reception unit.

The LD generation apparatus may further include a frame synchronization unit for synchronizing a frame of the LTE-DL signal received by the first receiver with a frame generated by the mapping unit.

The LD generation apparatus further includes a clock synchronization unit for receiving a 10 MHz reference clock from the base station and synchronizing the base station or the repeater with the reference clock.

Accordingly, when the base station serves a plurality of specific areas (e.g., a subway station, a bus stop, a building, etc.), it is possible to precisely identify and locate one specific area among a plurality of specific areas served by one base station , And provides an accurate positioning result.

Furthermore, since the location location service can be provided to the terminal based on the LTE, the effect of coping with the changing communication standard can be expected.

In addition, it is possible to measure / predict the number of terminals located around the repeater installation location and the degree of the load of the repeater, so that the base station allocates resources differently according to the load of the repeater, Can be expected.

In addition, the terminal having received the location registration according to the present invention can be used simultaneously with the GPS, so that the positioning accuracy of the outside can be increased, and the positioning can be performed even underground or in the building where GPS can not be used.

1 is a diagram showing a frame structure of an LTE-DL signal of a frequency division duplex (FDD) scheme.
2 is a block diagram illustrating an LTE system according to an embodiment of the present invention.
3 is a block diagram showing an LD generating apparatus according to an embodiment of the present invention.

The preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, in which the technical parts already known will be omitted or compressed for the sake of brevity.

Before describing an embodiment of the present invention, an LTE system will be briefly described with reference to Fig.

1 is a diagram showing a frame structure of an LTE-DL (LTE Downlink) signal of a frequency division duplex (FDD) scheme.

In the FDD mode, since uplink and downlink transmission are separated from each other in the frequency domain, 10 subframes are transmitted in the downlink and uplink in the 10 ms frame period, respectively.

The synchronization signal SS is transmitted twice over slots 0 and 10 in one frame. The synchronization signal SSS is transmitted to the fifth symbol of each slot in a different SSS (Secondary Synchronization Signal) and the same symbol PSS (Primary Synchronization Signal Is transmitted.

In this way, the synchronous signal is composed of different SSSs and different SSSs to distinguish 504 cells, and 504 cell IDs are obtained by combining 168 unique physical layer Cell ID groups and 3 unique physical layer IDs in each group .

That is, the cell ID means that the following formula is satisfied.

Figure 112015090302206-pat00001

(here,

Figure 112015090302206-pat00002
Means a PCI (Physics Cell ID)
Figure 112015090302206-pat00003
Means {0, 1, 2} corresponding to the PSS index,
Figure 112015090302206-pat00004
Means {0,1,2 ... 167} corresponding to the SSS index.

One slot is composed of a plurality of resource blocks (RBs) in the frequency domain, and one slot may include a minimum of 6 to a maximum of 100 RBs.

Generally, in an LTE system, a DU (donor unit, or a digital unit, which means a base station in the embodiment of the present invention), which is responsible for digital signal processing and resource control, (RU, Remote Unit or Radio Unit, which means a repeater in the embodiment of the present invention) that performs a passive function of amplifying a radio wave signal and delivering it to an antenna through an optical cable.

≪ Description of LTE based service providing system of the present invention >

Referring to FIG. 2, the LTE-based LBS service providing system of the present invention includes a terminal M, a base station DU, a repeater RU, an LD server LD, a repeater management server RM, ).

The terminal M performs location registration with a base station DU or a relay unit (RU) that manages the area currently located at the time of movement.

Meanwhile, the terminal M in the embodiment of the present invention may be a personal communication service (PCS), a global system for mobile (GSM), a wideband CDMA (W-CDMA) (Mobile Broadband System), and Long Term Evolution (LTE).

The base station DU is a component for providing an LTE service signal to the terminal M and transmits registrant information and a call request, a data transmission request, a wireless Internet access request, etc. of the terminal M to the exchange, , Data information, and the like to the terminal.

The repeater RU is a component for relaying a Long Term Evolution Uplink (LTE-UL) signal and a Long Term Evolution Downlink (LTE-DL) signal between a terminal M and a base station DU in a specific area.

The LD server LD stores location information including the installation location of the base station DU and the installation location of the relay unit RU to construct a location information database made up of the combination values and to manage the location information database Element.

The combination value is a data table stored in the location information database stored in the LD server (LD). As described above, the combination value is represented by a maximum of 31752 values including 504 cell IDs and Offset values ranging from 0 to 62 .

That is, as shown in the following table, it means that a total of 63 pieces of position information per cell ID can be expressed.

Location information Cell ID Offset One 500 0 2 One 3 2 .. .. .. .. .. .. 61 500 60 62 61 63 62

The LD generating apparatus 100 transmits the location information of the repeater relaying the communication between the terminal M and the base station DU from the LD server LD when the terminal M performs the location registration in cooperation with the repeater RU, Generates an LD signal including position information of a repeater (RU), and combines the LD signal and the LTE-DL signal.

In this case, the LD generating apparatus 100 may be provided as an external device connected to an output terminal of a repeater (RU) embedded in a repeater (that is, when the repeater is incorporated as a module of an RU).

The LD generating apparatus 100 of the present invention is most preferably implemented as an FPGA (Field-Programmable Gate Array) module incorporated in a repeater RU.

A field-programmable gate array (FPGA) is a semiconductor device that includes a programmable logic element and a programmable internal line. The programmable logic element is a basic element such as a combination of AND, OR, XOR, NOT, The function of the logic gate can be duplicated and programmed.

Most FPGAs contain a memory element with a simple flip-flop or memory block in the programmable logic element. The FPGA acquires the input data from the signal input device, processes the acquired input data through the specified signal processing logic, And outputs the output data to the signal output device.

The repeater management server RM is a component that receives the generation history of the LD signal generated by the LD generation apparatus 100 and analyzes and manages the number of registered terminals and the load of the repeater RU to which the terminal is connected .

In other words, the location registration of the terminal M is completed means that the terminal M is located around the installation position of the relay (RU) (the coverage of the relay (RU)). It is possible to determine the number of terminals relayed by the relay unit (RU) by analyzing the generated details of the signal, and thereby it is possible to measure or estimate the load (traffic) of the relay unit (RU)

If there are a plurality of relay units (RUs) installed at different positions from each other and there is a heavy load repeater having a large number of connected terminals or a heavy load compared to other repeaters, the repeater management server (RM) It is possible to allocate more resources to a high-load repeater so as to eliminate the traffic of the high-load repeater.

Hereinafter, the LD signal generating apparatus 100 for generating an LD signal for registering the position of the terminal M will be described in detail.

≪ Description of Components of LD Generating Apparatus 100 of the Present Invention >

2 and 3, the LD generating apparatus 100 of the present invention includes a first receiving unit 110, a second receiving unit 111, an information analyzing unit 120, a synchronization signal generating unit 121, And includes a synchronization signal delay unit 122, a mapping unit 130, a conversion unit 140, a filter unit 150, a transmission unit 160, a frame synchronization unit 170, and a clock synchronization unit 180.

The first receiving unit 110 is a component that receives the LTE-DL signal from the base station DU or the repeater RU.

In this case, the first receiving unit 110 according to the embodiment of the present invention is configured to convert the LTE-DL signal into a digital signal having a sampling rate of at least 100 MHz or more.

It is most preferable that the first receiving unit 110 is converted to have a sampling rate of 122.88 MHz because it is designed to operate at a sampling rate of about 100 MHz in a general repeater, In order to operate smoothly.

The second receiving unit 111 is a component that receives a combination value of a combination of Cell ID and Offset from the LD server (LD).

The information analyzer 120 receives a synchronization signal (SS) including a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) included in a frame of the LTE-DL signal received by the first receiver 110 And extracts the frame start point of the LTE-DL signal.

As described above, the Cell ID is 504, the 504 Cell IDs are generated through a combination of 168 unique physical layer Cell ID groups and three unique physical layer IDs in each group, and the Cell ID And analyzes the synchronization signal SS (Synchronization Signal) corresponding thereto.

The synchronization signal generation unit 121 is a component that analyzes the Cell ID from the combination value received by the second reception unit 111 and generates a synchronization signal corresponding thereto.

For example, when the cell ID received from the LD server LD is 437, the synchronization signal generation unit 121 analyzes that the PSS index and the SSS index are 2 and 145, respectively, ≪ / RTI >

Of course, a combination of a plurality of PSS indexes and SSS indexes corresponding to one Cell ID can occur.

Accordingly, the synchronization signal generating section 121 further includes a correlation analysis section (not shown) for analyzing which combination of the plurality of combinations has the highest correlation, and selects a combination of the PSS index and the SSS index with the highest correlation , And is preferably provided to generate a synchronization signal in the above-described combination.

At this time, the synchronization signal generation unit 121 generates a synchronization signal SS at a level lower than the level of the LTE-DL signal received by the first reception unit 110, and in the embodiment of the present invention, ) By about -15 dB to -30 dB.

The synchronization signal delay unit 122 is a component that delays the synchronization signal SS generated by the synchronization signal generation unit 121 by an offset value.

As described above, since the offset value ranges from 0 to 62, the synchronization signal delay unit 122 means to delay the synchronization signal SS differently for each offset value.

The mapping unit 130 forms a new frame of the same standard as the LTE-DL signal received by the first receiving unit 110, and outputs a synchronization signal delay unit 122 to a resource block (RB) And a synchronization signal SS delayed by the synchronization signal SS.

At this time, the mapping unit 130 allocates the synchronization signal SS to a different resource block (RB) by reflecting the delay degree because the synchronization signal SS has a different delay level for each offset value.

The conversion unit 140 is a component for performing an inverse Fast Fourier Transform (IFFT) on a new frame to which the synchronization signal SS delayed by the mapping unit 130 is mapped. According to the embodiment of the present invention, (140) is preferably provided so as to be capable of 64-iFFT (64 Point-Inversion Fast Fourier Transform).

The filter unit 150 is a component that filters the bandwidth of a new frame that is inversely Fourier-transformed by the conversion unit 140 to correspond to the bandwidth of the LTE-DL signal in the same manner as the bandwidth of the LTE-DL signal. According to the embodiment, the filter unit 150 is provided with an RRC filter (Root Raised Cosine Filter).

The transmitter 160 combines the LD signal filtered by the filter unit 150 and the LTE-DL signal received by the first receiver 110 and transmits the combined signal to the RU. RU to the terminal M, and the transmitter 160 is provided with a digital-analog converter (DAC) for converting a digital signal into an analog signal.

The frame synchronizing unit 170 is a component for synchronizing a frame of the LTE-DL signal received by the first receiving unit 110 and a new frame generated by the mapping unit 130. Specifically, the frame synchronizing unit 170 synchronizes the LTE- DL signal is synchronized with the LD signal generated by the filter unit 150 by synchronizing the synchronization signal SS allocated to the filter unit 150 with the synchronization signal SS generated by the mapping unit 130 do.

The clock synchronizer 180 receives a 10 MHz reference clock from the base station DU to synchronize the base station DU or the repeater RU with the LD generator 100 with a reference clock to be.

Accordingly, when the terminal M receiving the LD signal and the LTE-DL signal generated by the LD generating apparatus 100 according to the embodiment of the present invention is registered in position, Can be easily grasped.

Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection is to be construed in accordance with the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

DU: Base station RU: Repeater LD: LD server
RM: Repeater management server M: Terminal
100: LD generating device
110: first receiving unit 111: second receiving unit
120: Information analysis unit 121: Sync signal generation unit 122: Sync signal delay unit
130: mapping unit 140: conversion unit 150:
160: Transmitter 170: Frame synchronizer
180: clock synchronizing

Claims (7)

A terminal for performing location registration when moving;
A base station for providing an LTE service signal to the terminal;
A repeater for relaying an LTE-UL (Long Term Evolution Uplink) signal and an LTE-DL (Long Term Evolution Downlink) signal between the terminal and the base station in a specific area;
An LD (Location Detection) server for storing and managing location information including an installation location of the base station and an installation location of the relay device; And
When the terminal performs location registration in cooperation with the relay device, the terminal receives location information of a relay from the LD server that relays communication between the terminal and the base station, generates an LD signal including location information of the relay device And an LD generating device for combining the LD signal and the LTE-DL signal,
Wherein the repeater transmits the LTE-DL signal combined by the LD generation apparatus to the terminal, and the terminal is registered in the location. The method according to claim 1,
The LD generation apparatus includes:
A first receiver for receiving an LTE-DL signal (Long Term Evolution Downlink Signal) from the base station or the repeater;
A second receiver for receiving a combination value of a combination of a cell ID and an offset from the LD server;
A synchronization signal (SS) including a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) included in a frame of the LTE-DL signal received by the first receiving unit is analyzed to generate a frame of an LTE- An information analyzing unit for extracting a starting point;
A synchronization signal generator for generating a synchronization signal corresponding to the Cell ID;
A synchronization signal delay unit for delaying the synchronization signal generated by the synchronization signal generation unit by the Offset value;
A mapping unit for forming a new frame of the same size as a frame of the LTE-DL signal received by the first receiver and mapping a synchronization signal delayed by the synchronization signal delay unit;
A transform unit for inverse fast Fourier transforming the new frame generated by the mapping unit;
A filter unit for generating an LD signal by filtering the bandwidth of the new frame that has undergone the inverse Fourier transform by the transform unit to be equal to the bandwidth of the LTE-DL signal received by the first receiving unit; And
And a transmitter for combining the LD signal generated by filtering by the filter unit and the LTE-DL signal received by the first receiver and transmitting the combined signal to the repeater. 3. The method of claim 2,
Wherein the first receiving unit converts the LTE-DL signal into a digital signal having a sampling rate of at least 100 MHz or more. The method according to claim 1,
Wherein the LD generating device is implemented as an FPGA (Field-Programmable Gate Array) module embedded in the repeater. 3. The method of claim 2,
Wherein the synchronization signal generation unit generates a synchronization signal at a level lower than a level of the LTE-DL signal received by the first reception unit. 3. The method of claim 2,
The LD generation apparatus includes:
And a frame synchronizer for synchronizing a frame of the LTE-DL signal received by the first receiver with a frame generated by the mapping unit. 3. The method of claim 2,
And a clock synchronization unit receiving the 10 MHz reference clock from the base station and synchronizing the base station or the repeater with the reference clock by the LD generation apparatus, Based LBS service providing system.
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Publication number Priority date Publication date Assignee Title
US11621791B2 (en) 2020-07-01 2023-04-04 Electronics And Telecommunications Research Institute Apparatus and method for precise positioning based on deep learning

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150042457A (en) * 2013-10-11 2015-04-21 주식회사 엘지유플러스 Positioning System, Apparatus and Method using Mobile, Mobile and Position Display Method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150042457A (en) * 2013-10-11 2015-04-21 주식회사 엘지유플러스 Positioning System, Apparatus and Method using Mobile, Mobile and Position Display Method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11621791B2 (en) 2020-07-01 2023-04-04 Electronics And Telecommunications Research Institute Apparatus and method for precise positioning based on deep learning

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