KR101270709B1 - Apparatus and method for supplying standard clock in mobile commnuication - Google Patents

Abstract

The present invention relates to a mobile communication system, comprising: a satellite signal reference base station for providing a reference time to a base station of a mobile communication system, receiving satellite signals and generating auxiliary data that can be used to determine the reference time; A base station management server collecting the auxiliary data and storing the auxiliary data stored in the satellite receiver database server and transmitting the auxiliary data stored in the satellite receiver database server to the base station when the base station requests the auxiliary data; and receiving the auxiliary data from the base station management server. Including the base station connected to an indoor satellite receiver to obtain a reference time, an indoor satellite receiver (SPSR) does not need to implement an additional external network to provide an SNM of auxiliary data, and there is no existing commercial satellite receiver server (SPSR). server) Without the need, to obtain the SNM in the mobile communication network itself, and it is possible to collect data in a format used by the indoor satellite receiver it is possible to reduce the processing workload of the SNM data.

GPS, sync signal, reference clock, and assistant data.

Description

Apparatus and method for providing a reference time of a base station in a mobile communication system {APPARATUS AND METHOD FOR SUPPLYING STANDARD CLOCK IN MOBILE COMMNUICATION}

1 is a device for receiving reference time information using an outdoor satellite receiver (outdoor SPSR) according to the prior art,

2 is an overall network configuration for providing a reference time using an indoor satellite receiver (indoor SPSR) according to the prior art,

3 is a block diagram of an apparatus for receiving a reference time using an indoor satellite receiver according to the prior art;

4 is a flowchart for transmitting auxiliary data from a base station management server according to the prior art to an indoor satellite receiver;

5 is a flowchart for transmitting updated auxiliary data to an indoor satellite receiver in a base station management server according to the prior art;

6 is a processing block diagram of a satellite receiver server according to the prior art;

7 is a diagram illustrating a network providing a reference clock of a base station using SRSS according to an embodiment of the present invention;

8 is a configuration diagram when using the indoor satellite receiver as a SNM supply source according to an embodiment of the present invention,

9 is a processing block diagram of a satellite receiver database server according to the present invention;

10 is a flow chart of an SNM between an indoor satellite receiver 1000 and a satellite receiver database server according to an embodiment of the present invention;

11 is a flowchart illustrating an SNM between an indoor satellite receiver and a satellite receiver database server according to an embodiment of the present invention;

12 is a diagram illustrating a network configuration for providing a base station clock by connecting an outdoor satellite receiver to a base station management server according to an embodiment of the present invention;

13 is a diagram illustrating a network configuration for providing a base station clock by connecting an outdoor satellite receiver to a base station management server according to an exemplary embodiment of the present invention.

The present invention relates to an apparatus and method for providing a reference time to a base station of a mobile communication system, and more particularly to a base station of the mobile communication system The present invention relates to an apparatus and method for providing a reference time by transmitting auxiliary data provided by a satellite signal reference base station through a mobile communication network itself.

Typically, mobile communication systems are divided into cell units to provide services. The cell is an area serviced by a base station of a mobile communication system, and the base station receives reference time information directly from a Global Positioning System (GPS) satellite or the like and receives a message for determining the reference time from an external network. Can be obtained.

When the base station directly receives reference time information from a GPS satellite, the base station uses an outdoor satellite positioning service receiver (outoor SPSR), and receives a reference time information from an external network to receive the reference time information. In this case, an indoor satellite positioning service receiver (indoor SPSR) is used.

1 illustrates an apparatus for receiving reference time information using an outdoor satellite receiver (outdoor SPSR) according to the prior art.

Referring to FIG. 1, an outdoor SPSR 101 in a base station 100 receives satellite signals from a GPS satellite 110 and provides reference time information to the base station 100. In this case, the outdoor satellite receiver may provide reference time information without assistance data.

In order to provide reference time information to the base station 100 of the mobile communication system by using the outdoor satellite receiver 101, the GPS antenna installed outside the base station 101 can be visually received so that the GPS signal can be well received. It should be installed to secure it. For this reason, indoor installation of GPS antennas is impossible, and indoor base stations cannot use outdoor satellite receivers to obtain reference visual information. However, when the indoor satellite receiver (Indoor SPSR) is used, the GPS antenna can be installed indoors rather than outdoors, and thus can be installed close to the indoor base station, thereby reducing installation space and cost. However, in order to obtain a reference time using an indoor satellite receiver, some assistance data must be periodically transmitted from the outside. The auxiliary data are "current time within a certain error", "current position of the SPSR within a certain error", and "SPSR Nav. Message (SNM)".

In particular, the SNM decodes the data directly decoded from the live SPS signal by the SPSR as follows.

Map of the entire satellite (Almanac)

-Information to determine the location of a particular satellite (Ephemeris)

-Information to determine UTC time (UTC offset)

-Information about errors caused by the ionosphere (Ionosphere)

The SNM is an essential element for the satellite receiver to determine its location and the current time at that location. Indoor satellite receiver should also decode SNM to secure its position and time, but it is impossible to decode them directly in wireless environment where signal reception is bad (not able to determine bit). do.

2 illustrates an entire network configuration for providing a reference time using an indoor satellite receiver (indoor SPSR) according to the prior art.

Referring to FIG. 2, a satellite receiver local server (250) for storing satellite data from a GPS satellite and storing auxiliary data decoded in a satellite receiver server (SPSR Server) 200 via a public network 270. And a satellite receiver server 200 which periodically provides the auxiliary data to the base station management server 210 through the public network 280 and a base station management server that collects or provides base station management functions and auxiliary data to the base station 240 ( Base service management server 210 and the user database server 230 for providing user information to the base station management server 210 and the base station management server 210 receive the reference time information to provide a communication service. It consists of a base station 240 to provide.

The network consisting of the satellite receiver server 200 and the satellite receiver local server 210 provides an SNM as an indoor satellite receiver of a base station and is a network directly implemented by a base station manufacturer or a network of a service provider having an existing commercial satellite receiver server. would.

3 is a block diagram of an apparatus for receiving a reference time using an indoor satellite receiver according to the prior art.

The base station 300 must maintain synchronization with other base stations 300 in order to provide communication services. Therefore, the indoor satellite receiver 310 is used as a source for providing a reference time internally for synchronization. The indoor satellite receiver 310 is a kind of high sensitivity SPSR that enables the SPS signal to be operated in an environment in which the intensity of the SPS signal is significantly lower than that of the outside and has a lot of interference. In order to drive the indoor satellite receiver 301, some assistance data is required. The auxiliary data includes almanac and ephemeris information of the satellite, current time and current location information of the base station 300. The information is provided from the base station management server 200 to the base station 300 at an initial setting step and at regular intervals.

Almanac and ephemeris information is generated and transmitted by the satellite receiver server 340 and the satellite receiver local server 340. The satellite receiver local server 340, which is distributed over various regions, receives almanac and ephemeris information received from a GPS satellite by an internal outdoor satellite receiver 341 to the satellite receiver server 330 through a public network in real time. When transmitting, the satellite receiver server 330 collects almanac and ephemeris information received from the satellite receiver local server 340 in various regions and transmits the information to the base station management server 310 and the base station management server 310 transmits the base station 300. Each time the auxiliary data (REQ_auxiliary data) is transmitted from the indoor satellite receiver 301 of the control unit, Almanac and ephemeris information is transmitted. The user database server 320 transmits the position information of the corresponding user info when the base station management server 310 sends a User info message.

4 illustrates a flowchart of transmitting auxiliary data from a base station management server according to the prior art to an indoor satellite receiver.

Referring to FIG. 4, the initial setting step of the indoor SPSR 400 and periodically or whenever the base station requests auxiliary data (1. REQ_assist_data), the base station management server 410 is configured to provide time information and the base station. Provides location information of where you are located. The time information transmits a system time provided by an internal clock of the base station management server 410. In the case of location information, when the base station sends REQ_assist_data and user info together, the base station management server 420 transmits the user info to the user database server 420. Here, the user info may be a user call num, an ID or an address. The user database server 420 receives the user info, finds a user address, and transmits a user position suitable for the user address to the base station database server 410.

5 is a flowchart illustrating the transmission of updated auxiliary data from the base station management server according to the prior art to the indoor satellite receiver.

Referring to FIG. 5, the position value of the position database inside the user database server 520 is based on an initial value (address-to-position matched data), but after the initial operation, the indoor satellite receiver 500 of the base station is performed. Received the user position received from the user value stored in the user database server 530 through the user address message of the base station management server 510 and updated the position value (updated user position) for the next REQ_assist_data To the base station management server 510.

Figure 6 shows a processing block diagram inside the satellite receiver server according to the prior art.

Referring to FIG. 6, the SNM format of auxiliary data generated by receiving and decoding satellite signals for each satellite receiver may be different for each satellite receiver. Therefore, when the SNM format decoded by the outdoor satellite receiver is different from the SNM format or the type of data required by the indoor satellite receiver, reformatting (603) in the processing block 600 inside the satellite receiver server, It is sent to the base station management server through a series of rearrangement (602). If the SNM format decoded by the outdoor satellite receiver is the same as the SNM format or data type required by the indoor satellite receiver, the SNM format is transmitted to the base station management server without reformatting and rearranging.

The controller 601 transmits a corresponding control signal to a database when a REQ requesting an SNM is input.

In the related art, an independent network including a satellite receiver server (SPSR server) and a satellite receiver local server (SPSR local server) is implemented to provide auxiliary data for the operation of an indoor satellite receiver (SPSR). The network for providing auxiliary data must be serviced by the base station manufacturer directly configuring the network or by accessing the satellite receiver server of the service provider. This can be an additional burden from a human / temporal / cost perspective.

Accordingly, there is a need for an apparatus and method for generating and transmitting auxiliary data in a mobile communication system itself without constructing an independent satellite receiver server network for providing auxiliary data for operation of an indoor satellite receiver.

Accordingly, an object of the present invention is to provide an apparatus and method for providing a reference time of a base station.

Another object of the present invention is to provide an apparatus and method for providing a reference time in a mobile communication network itself without using an external network.

Another object of the present invention is to provide an apparatus and method for providing auxiliary data to an indoor satellite receiver in a base station.

An apparatus according to the present invention for achieving the above object is a system for providing a reference time to a base station of a mobile communication system, the satellite signal reference base station for receiving satellite signals to generate auxiliary data that can be used to determine the reference time And a base station management server which collects the auxiliary data and stores the auxiliary data in the satellite receiver database server and transmits the auxiliary data stored in the satellite receiver database server to the base station when the base station requests the auxiliary data. And the base station connected to an indoor satellite receiver receiving from the base station to obtain a reference time.

According to an aspect of the present invention, there is provided a method for providing a reference time to a base station of a mobile communication system, the method comprising: generating auxiliary data that can be used to determine a reference time by receiving a satellite signal; Collecting and storing the auxiliary data in the satellite receiver database server and transmitting the auxiliary data stored in the satellite receiver database server to the base station when the base station requests the auxiliary data; and receiving the auxiliary data from the base station management server. It is characterized in that it comprises a process of obtaining a reference time in connection with the satellite receiver.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, the present invention will be described an apparatus and method for providing auxiliary data necessary for the operation of an indoor SPSR to a base station of a mobile communication system without adding a separate network.

7 is a diagram illustrating a network providing a reference clock of a base station using SRSS according to an embodiment of the present invention.

Referring to FIG. 7, an indoor satellite reception antenna (outdoor SPS ANT) or an outdoor satellite reception antenna (outdoor SPS ANT) is used to supply only a base station 740 that provides a communication service by receiving a reference time and auxiliary data. A satellite signal reference base station (hereinafter referred to as "SRBS") 750 and a base station management server 720 for collecting or providing base station management functions and necessary information; A user database server (710) for providing user information to the base station management server and a satellite receiver database server (SPSR) for processing and storing auxiliary data collected at each base station and forwarding it to an indoor satellite receiver (SPSR). Database Server 730 is connected to the mobile communication network 700.

Using the SRBS 750 or the base station 740, the auxiliary data can be decoded and collected in its own mobile communication network without an independent satellite receiver server network and supplied to the base station 740 as needed.

SRBS 750 is identical in hardware to base station 740 in the same network. However, in order to supply auxiliary data exclusively, software processing is performed, and instead of receiving and operating the auxiliary data, the self-decoded auxiliary data is transmitted to the base station management server 720, which is again the satellite receiver database server 730. Are stored in. The SRBS 750 may connect an outdoor satellite receiver antenna (outdoor SPS ANT) to receive the satellite signal more stably. However, it is also possible to use an indoor SPS ANT.

The base station 740 may be configured without a separate SRBS 750. In this case, all base stations 740 may receive and use auxiliary data as well as a function of directly transmitting decoded auxiliary data. Therefore, in response to an auxiliary data request command (command) of the base station management server 720, the auxiliary data is transmitted to the base station management server 720, which is stored in the satellite receiver database server 730 again.

8 is a block diagram of a case where an indoor satellite receiver according to an embodiment of the present invention is used as a SNM source.

Referring to FIG. 8, the satellite receiver database server 830 collects and stores the SNM decoded from the GPS satellite signal by the indoor satellite receiver 801 inside the base station 830 connected to the base station management server 800. . That is, indoor satellite receiver 801 is a user and supplier of SNM. The SNM supplied by the indoor satellite receiver 801 should not be received from the base station management server 800 but decoded from the GPS satellites.

In the above method, the SNM use and the supply base station 830 coincide with each other, but there is also a method of designating the SRBS 840 in order to use the existing indoor satellite receiver 801 as the SNM source only. This is intended to simplify the function more simply by limiting the function of the base station 830 to the user. In this case, in order to supply more stable SNM, an SRBS 850 using an outdoor satellite receiver antenna (outdoor SPS ANT) may be connected.

This means that the user database server 810, the satellite receiver database server 820, and the base station management server 800 may exist in the same network, separated or integrated. This is different from that of being separated from the base station management server when the SNM is supplied from the conventional external network.

9 shows a processing block diagram of a satellite receiver database server according to the present invention.

Referring to FIG. 9, the auxiliary data collected by the base station management server matches a data format or data type used by an indoor SPSR, thus reformatting or rearranging. It can be stored or transmitted to satellite receiver database server without any process. In addition, when the base station requests auxiliary data, the controller transmits a control signal to the internal database.

10 is a flowchart illustrating an SNM between an indoor satellite receiver 1000 and a satellite receiver database server according to an exemplary embodiment of the present invention.

Referring to FIG. 10, when the indoor satellite receiver 1000 in the base station is used as the SNM source, the satellite receiver database server 1020 requests the SNM to the target indoor satellite receiver at predetermined intervals during the operation of the indoor satellite receiver 1000. And (1. REQ_auxiliary data, 2. REQ_auxiliary data) collection (3. Decoded auxiliary data) and storage (4. Decoded auxiliary data), the indoor satellite receiver (1000) needs to be restarted or during operation. When the SNM is requested (5. REQ_auxiliary data, 6. REQ_auxiliary data), the satellite receiver database server 1020 transmits the stored SNM back to the indoor satellite receiver 1000 (7. Decoded auxiliary data, 8. Decoded ancillary data). Between the indoor satellite receiver 1000 and the satellite receiver database server 1020, the base station management server 1010 collects SNM from the indoor satellite receiver 1000 and transmits the SNM to the satellite receiver database server 1020.

11 is a flowchart illustrating an SNM between an indoor satellite receiver and a satellite receiver database server according to an exemplary embodiment of the present invention.

Referring to FIG. 11, when the indoor satellite receiver 1100 in the SRBS 1130 is used as the SNM source, the satellite receiver database server 1120 requests the SNM to the indoor satellite receiver in the target SRBS 1130 at regular intervals (1. REQ_auxiliary data, 2.REQ_auxiliary data) to collect and store (3. decoded auxiliary data, 4. decoded auxiliary data) and request SNM when the indoor satellite receiver is needed during restart or operation. (5.REQ_auxiliary data, 6.REQ_auxiliary data), the satellite receiver database server 1120 transmits the stored SNM back to the indoor satellite receiver 1100 through the base station management server 1110 (7). Decoded auxiliary data, 8. decoded auxiliary data).

12 illustrates a network for providing a base station clock by connecting an outdoor satellite receiver to a base station management server according to an embodiment of the present invention.

Referring to FIG. 12, another method of supplying the SNM is to connect the outdoor satellite receiver 1200 directly to the base station management server 1230 to collect the SNM. In this case, the base station management server 1230 is simply an outdoor satellite. It only needs to format and rearrange the SNM of the receiver 1200 and store it in a database without collecting SNM from various SNM sources. If the outdoor satellite receiver 1200 is replaced with an indoor satellite receiver inside the SRBS 1210, it is not necessary to format and rearrange the satellite receiver.

FIG. 13 illustrates a network for providing a base station clock by connecting an outdoor satellite receiver to a base station management server according to an embodiment of the present invention.

Referring to FIG. 13, when the outdoor satellite receiver 1310 is used as the SNM source, the base station management server 1320 requests the SNM to the outdoor satellite receiver 1310 at regular intervals to collect and store the SNM. The indoor satellite receiver 831 of the device station 830 requests the SNM stored in the base station management server 1320 to obtain the stored SNM. In addition, the user database server 1330 provides user location information to the base station management server 1320.

12 and 13 are effective when the base station 100 is adjacent to the BMS 200 to which the Outdoor SPSR 320 is connected due to the limitation of the number of SNM data. For reference, the reason why the numerical limitation of SNM occurs is explained in GPS. Message There are SNMs for all 32 satellites, but if you use the above method, you will only be able to collect SNMs that are visible in the sky of the area where the Outdoor SPSR 320 is located.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

An indoor SPSR does not need to implement an additional external network to provide an SNM of auxiliary data, and does not need to access an existing commercial satellite receiver server (SPSR server), so that an SNM can be acquired within the mobile communication network itself. In addition, data can be collected in the format used by indoor satellite receivers, reducing the amount of processing of SNM data.

Claims (16)

In the system for providing a reference time to the base station of the mobile communication system, A satellite signal reference base station that generates and decodes auxiliary data that can be used to determine a reference time by receiving a satellite signal; A base station management server for collecting the auxiliary data and storing the auxiliary data stored in the satellite receiver database server and transmitting the auxiliary data stored in the satellite receiver database server to the base station when the base station requests the auxiliary data; And the base station connected to an indoor satellite receiver for receiving the auxiliary data from the base station management server to obtain a reference time. The method of claim 1, The base station management server further comprises a user database server for transmitting the location information of the base station when requesting the location of the base station. The method of claim 1, The indoor satellite receiver is characterized in that for supporting location services and reference time information. The method of claim 1, And the satellite signal reference base station is connected to an indoor satellite receiver for decoding the satellite signal to supply the auxiliary data and transmitting the auxiliary data. The method of claim 1, The auxiliary data includes all data acquired from the satellite signal, time information for transmitting the data, and location information of the base station for receiving the data. The method of claim 1, And the satellite receiver database has a function of reformatting the auxiliary data and rearranging the auxiliary data according to the order of satellites. The method of claim 1, The base station includes a function of the satellite signal reference base station. The method of claim 1, System for using an indoor satellite receiver or an outdoor satellite receiver directly connected to the base station management server instead of a satellite receiver database server. In the method for providing a reference time to the base station of the mobile communication system, Receiving a satellite signal and decoding the auxiliary data that can be used to determine a reference time by itself; Collecting the auxiliary data and storing the auxiliary data in the satellite receiver database server and transmitting the auxiliary data stored in the satellite receiver database server to the base station when the base station requests the auxiliary data; And acquiring a reference time by connecting the auxiliary data to an indoor satellite receiver receiving the auxiliary data from the base station management server. 10. The method of claim 9, The base station management server further comprises a user database server for transmitting the location information of the base station when requesting the location of the base station. 10. The method of claim 9, And the indoor satellite receiver supports location services and reference time information. 10. The method of claim 9, And the satellite signal reference base station is connected to an indoor satellite receiver which decodes the satellite signal and supplies the auxiliary data to supply the auxiliary data. 10. The method of claim 9, The auxiliary data may include all data obtained from satellite signals, time information for transmitting the data, and location information of a base station for receiving the data. 10. The method of claim 9, And the satellite receiver database includes the function of reformatting the auxiliary data and rearranging the auxiliary data according to the order of the satellites. 10. The method of claim 9, And the base station includes a function of the satellite signal reference base station. 10. The method of claim 9, An indoor satellite receiver or an outdoor satellite receiver is directly connected to the base station management server instead of the satellite receiver database server.

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