KR20100055745A - Dmb service terminal for performing handover base on position information, controll apparatus and method for handover - Google Patents

Abstract

PURPOSE: A DMB service terminal for performing handover based on position information, and a handover control apparatus and a device therefor are provided to perform handover based on distance information between a service terminal and a base station, thereby simply configuring technical configuration. CONSTITUTION: A position perceiving unit(110) grasps present position information of a terminal. A base station information storage unit(130) stores a plurality of base station information in which location information is included. A handover performing unit(120) decides whether to perform handover based on the present position information and the stored base station information. The handover performing unit performs handover according to the determination result. A channel information storage unit(140) stores channel information about one or more neighboring base stations.

Description

DMB service terminal for performing handover base on position information, Controll Apparatus and Method for Handover}

The present invention relates to a handover, and more particularly, to a technique for performing a handover function when a terminal for digital multimedia broadcasting (DMB) moves between transmission zones belonging to different base stations.

The present invention is derived from the research conducted as part of the radio broadcasting industry promotion development project of the Ministry of Knowledge Economy and the Ministry of Information and Communication Research. [Task Management Number: 2005-S-301-03, Title: Communication Maritime Satellite Satellite Communication System]

In the case of digital multimedia broadcasting (DMB) service, even the same channel is provided through different frequencies according to regions. Therefore, when a user moves to another area while watching a broadcast of a specific channel using a DMB terminal, the service is interrupted when passing between transmission zones.

The DMB service is divided into a transmission zone A belonging to a base station and a transmission zone B belonging to another base station according to its location, and the terminal belonging to the transmission zone is provided through the base station of the transmission zone. However, at this time, the corresponding channel is provided at different frequencies in the A zone and the B zone for the same channel. Therefore, when the DMB terminal moves from the A region to the B region, the service is cut off at the boundary of the service area of the A region, and after moving to the B region, the DMB channel frequency re-search is performed to provide the service through the frequency of the corresponding channel in the B region. Will be provided.

In order to compensate for this disadvantage, a method of performing handover according to the received signal strength by detecting the strength of the received signal received by the DMB terminal has been proposed. In order to continuously receive DMB service while moving from the boundary of the transmission zone of region A to the transmission zone of region B, the channel frequency is searched in the regions where the signal strength is strong in region A and region B, and the channel strength is changed. Handover is performed.

However, the method of performing handover based on the signal reception strength may cause a problem in handover in a signal shadow area if the DMB terminal is located in a weak electric field area in the transmission area, thereby causing a problem in that the service is cut off.

Disclosure of Invention The present invention is derived from the above-described technical background, and an object of the present invention is to provide a digital multimedia broadcasting service terminal and a method for performing handover that can implement a handover decision by a simpler configuration in a digital multimedia broadcasting service.

In addition, the present invention provides a broadcast service terminal and a handover method for providing a broadcast service without interruption even in a weak field or a signal shadow area.

According to an aspect of the present invention, there is provided a digital multimedia broadcasting service terminal that receives digital multimedia broadcasting data and outputs the received digital multimedia broadcasting data, the digital multimedia broadcasting service terminal comprising: a position determining unit configured to determine current location information of the apparatus; A base station information storage unit for storing a plurality of base station information including location information; And a handover performing unit determining whether to perform a handover based on the current location information and the stored base station information, and performing a handover according to the determination result. It is achieved by a digital multimedia broadcasting service terminal comprising a.

The handover performing unit calculates distance information between the neighbor base stations and the digital multimedia broadcasting service terminal according to the base station information of the neighbor base stations, and according to whether the currently connected base station is a base station that exists at the shortest distance from the service terminal, If another base station in distance is found, handover is performed to the base station.

The apparatus may further include a channel information storage unit for storing channel information of the at least one neighboring base station, wherein the handover performing unit pre-sees channel information of another base station existing at the shortest distance based on the stored channel information. It is characterized by grasping.

On the other hand, the technical problem in the handover control device linked to the digital multimedia broadcasting service terminal that receives the digital multimedia broadcasting data, and outputs the received digital multimedia broadcasting data, the position grasping to determine the current position information of the device part; A base station information storage unit for storing base station information including location information of the base station; And a controller for determining whether to perform a handover based on the current location information and the base station information, and providing a handover control command to the digital multimedia broadcasting service terminal according to the determination result. It is also achieved by the device.

In addition, determining the current position based on the received satellite signal; Determining distances from adjacent base stations based on the identified current position information and previously stored base station position information; Determining whether the currently connected base station is a base station located at the shortest distance according to the determination result; Determining a handover to the base station when another base station located at the shortest distance is found according to the determination result; And performing a handover according to the determination. The method is also achieved by a method for performing handover when providing a digital multimedia broadcasting service.

According to the present invention, by performing the handover based on the distance information between the service terminal and the base station, there is an effect that the technical configuration can be implemented more simply than in the conventional method of performing the handover decision according to the received signal strength.

In addition, when the mobile station is located in a weak electric field area that may be generated in a handover method according to the received signal strength in the terminal, or a broadcast interruption may be prevented in a shaded area.

The foregoing and further aspects of the present invention will become more apparent through the preferred embodiments described with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail so that those skilled in the art can easily understand and reproduce the present invention through these embodiments.

1 is an exemplary diagram of a DMB service providing network configuration diagram.

In the present embodiment, the DMB service terminal 10 is a terminal device for providing a DMB broadcasting service, and may be implemented as a mobile terminal such as a mobile phone or a PDA or an in-vehicle navigation. However, the present invention is not limited thereto and is interpreted to cover obvious modifications.

First, when the DMB service terminal 10 is located at the boundary of the zone A and zone B transmission zone while moving from the zone A transmission zone to the zone B transmission zone, the DMB service terminal 10 broadcasts the base station 15A of zone A. A broadcast service may be provided by searching for a channel by frequency.

The broadcast service is cut off when the vehicle gradually moves to the transmission zone of the region B, crosses the boundary region of the region A transmission zone and the transmission zone of the region B, and leaves the transmission zone of the region A. Therefore, in order to receive a broadcast service through the base station 15B of the B area transmission zone to which a frequency for each channel different from the A area transmission zone is allocated, the B area transmission zone channel search is performed.

In addition, the DMB service is provided through the base station 15B of the B zone transmission zone by acquiring a frequency for each channel of the B zone transmission zone. As described above, the existing DMB service terminal 10 detects the reception strength of the received signal received from the base stations of the A zone transmission zone and the B zone transmission zone to the DMB service terminal 10, and thus, the channel of the region having strong reception signal strength. Channel handover was performed in the area where the signal strength is changed by searching the frequency.

However, in this case, if the DMB service terminal 10 is located in the weak electric field area in the transmission zone, there is a concern that a problem may occur during handover due to signal shading or the like. On the other hand, according to the present invention, by performing the handover based on a physical value such as distance information with the base station, there is an effect that can increase the efficiency of the handover.

In this case, as shown in FIG. 2, the DMB service terminal 10 is located at a point where two or more zones overlap, such as transmission zones A, B, and C, and the base stations 15A, 15B, and 15C of each transmission zone. It is determined whether the handover is performed based on the distance information.

Specifically, when the DMB service terminal 10 is located at a point where two or more transmission zones overlap, the DMB service terminal 10 calculates a distance from adjacent base stations 15A, 15B, and 15C. That is, the values of d _A , d _B , and d _C are calculated. According to the result of the calculation, the values of d _A , d _B , and d _C are compared, and when the distance d _A with the base station of the transmission zone currently being accessed is the smallest, the service is maintained and the broadcast service is performed through the base station of the transmission zone A. Receive On the other hand, when d _B is the smallest, broadcast service is provided through the base station of the B transmission zone and through the base station of the C transmission zone when d _C is the smallest.

In this case, when the DMB service terminal 10 is located at the boundary of at least two transmission zones, the DMB service terminal 10 obtains channel information about the neighboring transmission zone and stores the channel information on its own. When handover is required, channel information of a transmission zone to perform handover may be acquired based on information held by itself. Accordingly, in order to perform handover, it is possible to save time and procedures that require channel information of a plurality of transmission zones.

2 is a block diagram illustrating a configuration of a DMB service terminal according to an embodiment of the present invention.

As shown in FIG. 2, the DMB service terminal according to an embodiment of the present invention includes a communication unit 100 including a broadcast receiver 102 and a GPS receiver 105, a broadcast output unit 160, and a location determiner 110. ), The base station information storage unit 130 and the handover performing unit 120.

The communication unit 100 includes a broadcast receiving unit 102 for receiving DMB broadcast data and a GPS receiving unit 105 for receiving a GPS satellite from a GPS satellite. In the present embodiment, the GPS receiver 105 may be implemented by including a Global Positioning System (GPS) module that receives a GPS signal from a GPS satellite. When the broadcast receiver 102 starts to receive the DMB broadcast data, the GPS receiver 105 starts to receive the GPS satellite signals in real time from the GPS satellites.

The broadcast receiver 102 receives the DMB broadcast data. The broadcast output unit 160 screen-outputs the DMB broadcast data received by the broadcast receiver 102.

The location determiner 110 determines the current location information of the device based on the signal received through the communication unit 100. In the present embodiment, the location determiner 110 determines the location of the current terminal based on the signal received from the GPS satellites through the GPS receiver 105. The positioning unit 110 may measure the exact time and distance from three or more GPS satellites, and calculate the current position according to the triangulation method of three different distances.

The base station information storage unit 130 stores a plurality of base station information including location information. The base station information storage unit 130 may be implemented as a conventional memory that is externally accessible. In the present embodiment, the base station information storage unit 130 stores location information about the plurality of base stations and their output information.

The DMB service terminal according to an embodiment of the present invention further includes an information update unit 150. The information updater 150 may perform a function of additionally inputting, modifying, updating, and deleting base station information stored in the base station information storage unit 130. In the present embodiment, the information update unit 150 updates contents stored in the base station information storage unit 130 based on data input from the outside through a PC, an external memory such as a UBS or a memory card, or the Internet.

The handover performer 120 determines whether to perform the handover based on the current location information identified by the location determiner 110 and the base station information stored in the base station information storage 130. Then, handover is performed according to the determination result.

In the present embodiment, the handover performer 120 calculates the distance between the digital multimedia service terminal and the adjacent base stations in real time based on the current location information. In this case, the handover performer 120 may calculate a distance between two or more adjacent base stations. When the DMB service terminal is located in the boundary area of the transmission zone, it is determined whether to perform the handover based on the distance information with the base station of the transmission zone to which the current DMB service terminal belongs and the distance information with other adjacent base stations.

In this case, the handover performer 120 may previously determine channel information of neighboring base stations in addition to the base station of the currently connected transmission zone based on the channel information stored in the channel information storage 140.

In this case, the channel information storage unit 140 may be implemented as a storage device such as a memory, and may be configured in a single configuration with the above-described base station information storage unit or may be implemented in separate configurations. The channel information storage unit 140 stores at least two base station channel information.

When the DMB service terminal is located in a boundary area of a plurality of transmission zones using the calculated distance information between the service terminal and the base station, the handover performing unit 120 acquires channel information about the base stations of the neighboring area in advance. The information is stored in the storage unit 140.

Thereafter, when performing the handover, the handover performing unit 120 does not separately perform channel information retrieval of the base station to perform the handover, and quickly performs channel information based on information previously stored in the channel information storage unit 140. I can figure it out. When performing the handover, the channel handover may be performed by performing channel synchronization on the channel frequency in the transmission zone currently connected and the channel frequency in the transmission zone in which the handover is to be performed.

3 is a block diagram illustrating a configuration of a handover control apparatus according to an embodiment of the present invention.

In the present embodiment, the handover control device 30 may be implemented in a separate configuration from the DMB service terminal 20 that provides the digital multimedia broadcasting service. The handover control device 30 according to an embodiment of the present invention may operate in conjunction with the DMB service terminal 20 without a GPS signal receiving function. The handover control apparatus 30 according to the present embodiment transmits a control signal for performing handover to the DMB service terminal 20. Then, the DMB service terminal 20 performs the handover according to the handover control signal input from the handover control device 30.

In more detail, the handover control apparatus 30 according to an embodiment includes a communication unit 300 including a GPS receiver 305, a location determiner 310, a controller 320, a base station information storage unit 330, and channel information. The storage unit 340 includes an information update unit 350 and an interface unit 360.

The communicator 300 includes a GPS receiver 105. In the present embodiment, the communication unit 300 not only receives the GPS signal for identifying the current position information, but also the channel stored in the base station information or channel information storage unit 340 stored in the base station information storage unit 330. In order to update the information, the configuration may be configured to receive data from an external memory such as a PC, a UBS, or a memory card. Or it may be implemented as a communication module that can receive data through the Internet, short-range wireless communication, and the like.

The GPS receiver 305 may be implemented as a Global Positioning System (GPS) module that receives a GPS signal from a GPS satellite.

The location detecting unit 310 grasps the current location information of the handover control device 30 in real time based on the information received from the GPS satellite from the GPS receiving unit 305. The GPS receiver 305 may measure the exact time and distance from three or more GPS satellites to accurately calculate the current position according to a triangulation method of three different distances.

The base station information storage unit 330 stores a plurality of base station information including location information. The base station information storage unit 330 may be implemented as a conventional memory that is externally accessible. In the present embodiment, the base station information storage unit 330 stores location information about the plurality of base stations and their output information.

The handover control device 30 according to an embodiment of the present invention further includes an information update unit 350. The information updater 350 may perform additional input, correction, update, and deletion of the base station information stored in the base station information storage unit 330. In the present embodiment, the content stored in the base station information storage unit 330 is updated based on the data input through the communication unit 300.

The controller 320 determines whether to perform a handover based on the current location information identified by the location determiner 310 and the base station information stored in the base station information storage unit 330. Then, the handover control signal is provided to the DMB service terminal 20 according to the determination result.

In the present embodiment, the handover performing unit 320 calculates the distance between the handover control device and the neighbor base stations in real time based on the current location information. In this case, the handover performer 320 may calculate a distance between two or more adjacent base stations. When the DMB service terminal 20 is located in the boundary zone of the transmission zone, the handover is performed based on the distance from the base station of the transmission zone to which the current DMB service terminal 20 belongs and the distance information with other adjacent base stations. Determine whether to perform.

In this case, the controller 320 may previously determine channel information of neighboring base stations in addition to the base station of the currently connected transmission zone based on the channel information stored in the channel information storage unit 340.

In this case, the channel information storage unit 340 may be implemented as a storage device such as a memory. The channel information storage unit 340 may be configured in a single configuration with the base station information storage unit described above or may be implemented in a separate configuration. The channel information storage unit 340 stores at least two base station channel information.

If the control unit 320 determines that the handover control device 30 is located in a boundary area of a plurality of transmission zones by using the calculated distance information between the handover control device 30 and the base station, the base stations of the adjacent area are located. Acquire channel information about and store it in the channel information storage unit 340.

The control unit 320 transmits a handover control signal to the DMB service terminal 20 through the interface unit 360. The interface unit 360 has a configuration corresponding to the interface unit 340 of the DMB service terminal 20. For example, the interface unit 360 may be implemented as a USB port or a short range wireless communication module. However, the interface unit 360 is not limited thereto. The interface unit 360 is connected to each other to include a configuration capable of transmitting a handover control signal.

Thereafter, when performing the handover, the handover performing unit 320 of the DMB service terminal 20 does not separately perform channel information retrieval of the base station to perform the handover, but based on the information stored in the channel information storage unit 340. Channel information can be quickly identified. When performing the handover, the channel handover may be performed by performing channel synchronization on the channel frequency in the transmission zone currently connected and the channel frequency in the transmission zone in which the handover is to be performed.

The DMB service terminal 20 is a terminal device for providing a DMB broadcasting service, and may be implemented as a mobile terminal such as a mobile phone or a PDA or a vehicle-mounted navigation device. However, it is not limited thereto.

In one embodiment, the DMB service terminal 20 outputs the DMB broadcast data received through the broadcast receiver 220 through the broadcast output unit 200.

The interface unit 240 corresponds to the interface unit 360 of the handover control device 30 as described above, and receives a handover control signal from the handover control device 30.

The handover performer 230 performs a handover according to the handover control signal received from the handover control device 30 through the interface unit 240. In this case, the handover performer 230 may directly perform the handover by acquiring base station information and channel information to perform the handover included in the handover control signal received through the interface unit 240. That is, the time required for acquiring the frequency information of the broadcast channel in the transmission zone to perform the handover can be reduced, thereby performing a faster handover, so that the broadcast data in the boundary zone of the transmission zone during the DMB service can be reduced. There is an effect that can prevent the reception is cut off.

4 is a flowchart illustrating a handover method according to an embodiment of the present invention.

First, the DMB service terminal searches for a broadcast service of a specific channel and receives corresponding broadcast service data (S400). When the broadcast service data is received, the DMB service terminal determines the current location information (S410). In this case, determining the current position information may be performed based on a GPS signal received from a GPS satellite.

And, based on the previously stored information to determine the location information of the adjacent base stations. The distance between the DMB service terminal and neighboring base stations is calculated based on the location information of the base stations identified afterwards (S420). In operation S430, channel information about neighbor base stations is determined based on previously stored channel information. In this case, when it is determined that the location information is determined at the boundary of at least two transmission zones in the current location information identifying step S410, channel information about neighboring base stations may be acquired and stored in advance. Alternatively, the information may be stored to match with the stored base station information. Accordingly, before performing the handover, it is possible to grasp channel information of neighboring base stations in advance. That is, the channel information can be quickly identified based on previously stored information without separately performing channel information retrieval of the base station to perform the handover.

Then, it is determined whether the currently connected base station is a base station existing at the shortest distance (S440). If the base station currently connected is at the shortest distance, it continues to receive DMB data through the base station. On the other hand, if a base station exists at the shortest distance other than the accessing base station is found (S450), handover is performed to the transmission zone of the base station existing at the shortest distance (S460). When performing the handover, the channel handover can be quickly performed by performing channel synchronization with the channel frequency in the transmission zone currently connected and the channel frequency in the transmission zone to be handed over.

So far I looked at the preferred embodiments of the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

1 is an exemplary diagram of a DMB service providing network configuration diagram;

2 is a block diagram showing the configuration of a DMB service terminal according to an embodiment of the present invention;

3 is a block diagram showing the configuration of a handover control apparatus according to an embodiment of the present invention;

4 is a flowchart illustrating a handover method according to an embodiment of the present invention.

Claims (10)

In the digital multimedia broadcasting service terminal for receiving digital multimedia broadcasting (DMB) data and outputting the received digital multimedia broadcasting data, A location determination unit for grasping current location information of the terminal; A base station information storage unit for storing a plurality of base station information including location information; And A handover performing unit determining whether to perform a handover based on the current location information and the stored base station information, and performing a handover according to the determination result; Digital multimedia broadcasting service terminal comprising a. The method of claim 1, The handover performing unit calculates distance information between the neighbor base stations and the digital multimedia broadcasting service terminal according to the base station information of the neighbor base stations, and according to whether the currently connected base station is a base station that exists at the shortest distance from the service terminal, And if another base station in the distance is found, handover to the base station. The method of claim 2, It further comprises a channel information storage unit for storing channel information for the at least one neighboring base station, The handover performer determines in advance the channel information of another base station existing in the shortest distance based on the stored channel information. The method of claim 1, And an information update unit for updating the base station information stored in the base station information storage unit. In the handover control device linked to a digital multimedia broadcasting service terminal that receives digital multimedia broadcast (DMB) data and outputs the received digital multimedia broadcasting data, A location determination unit for grasping current location information of the device; A base station information storage unit for storing base station information including location information of the base station; And And a controller for determining whether to perform a handover based on the current location information and the base station information, and providing a handover control command to the digital multimedia broadcasting service terminal according to the determination result. . The method of claim 5, The control unit calculates distance information between the neighbor base stations and the handover control device according to the base station information of the neighbor base stations, and according to whether the currently connected base station is a base station existing at the shortest distance with the handover control device. Handover control apparatus for providing a handover control command to perform a handover to the base station if another base station located in the distance is found. The method of claim 5, And a channel information storage unit for storing channel information on at least one neighboring base station. The control unit is characterized in that the channel information of the other base station existing in the shortest distance based on the stored channel information in advance and further provides to the digital multimedia broadcasting service terminal. The method of claim 5, And the location detecting unit detects current location information based on the received GPS signal. A method for performing handover when providing a digital multimedia broadcasting service, Determining a current position based on the received satellite signal; Determining distances from adjacent base stations based on the identified current position information and previously stored base station position information; Determining whether the currently connected base station is a base station located at the shortest distance according to the determination result; Determining a handover to the base station when another base station located at the shortest distance is found according to the determination result; And Performing a handover according to the determination; handover performing method when providing a digital multimedia broadcasting service. The method of claim 9, And grasping and storing channel information of the adjacent base stations in advance. The performing of the handover is a method of performing a handover when providing a digital multimedia broadcasting service, wherein the handover is performed based on the stored channel information.

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