JP2005101820A - Communication terminal device and method for selecting communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve low power consumption in a mobile communication system which can selectively communicate with a plurality of communication systems by a mobile unit with another communication system existing in a certain communication system. <P>SOLUTION: A communication terminal device includes a mobile unit 300 having a receiver 310 which receives a signal including system information and position information of a local system existing in the certain communication system, and a position detector 318 which detects an own position based on a received signal. A system selector 320 selects a communication system which can perform a receiving operation or a random accessing operation at the lowest power consumption from a certain communication system and the local system, based on the local system information and position information of a local system included in the received signal and own position information detected. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a communication terminal apparatus and a communication system selection method in which another communication system exists in a certain communication system and can selectively communicate with the plurality of communication systems.

  Usually, in a mobile communication system (hereinafter simply referred to as “communication system”), a system (cellular system) of a method (cell configuration) for covering a service area with a plurality of base stations is used. In such a communication system, there is a case where another communication system exists in a certain communication system, and the mobile device is compatible with the plurality of communication systems. As an example, there is a system such as a wireless local area network (LAN) in a cellular system such as PDC (Personal Digital Cellular) or W-CDMA (Wideband Code Division Multiple Access), and a mobile device is included in these communication systems. The case where it corresponds is mentioned.

  For example, when there is a base station of the local communication system B in the area of a base station of a certain communication system A and the mobile device supports each of the communication system A and the local communication system B, the mobile device This is achieved by selecting a standby communication system based on a search result of each system. When the mobile device is located in the area of the local communication system B, it is usually possible to operate with lower power consumption by selecting the local communication system B.

  That is, in the configuration in which the mobile device is configured to manually select the communication system, the communication system A is selected when it is known that the user (mobile device) is located outside the area of the local communication system B. If the local communication system B is known to be located in the area, the local communication system B is selected and awaited.

In addition, if each communication system is searched periodically, it is possible to determine whether or not the communication system A or the local communication system B is within the area of the local communication system B by periodically receiving the communication system A or the local communication system B. In response to the determination, a communication system that waits is selected. In addition, as a structure which searches each communication system regularly in this way, it can implement by applying the structure of patent document 1, for example.
JP 2002-199428 A

  However, when manually selecting the communication system to be awaited, if the user (mobile device) moves from outside the area of the local communication system B into the area of the local communication system B, the local communication is performed unless the user switches the communication system. There is a problem that the system B cannot stand by and does not lead to low power consumption.

  In addition, when searching for each communication system periodically, switching to the local communication system B is automatically possible, but a delay corresponding to the time for searching occurs, and switching to the local communication system B without delay is possible. Can not. Further, when the vehicle is located outside the area of the local communication system B and does not move into the area of the local communication system B, the process of searching for the local communication system B is wasted and the power consumption due to the search operation is increased. There is a problem that arises. In other words, there is a certain limit to reducing power consumption.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a communication terminal device, a base station device, a mobile communication system, and a communication system selection method capable of improving power consumption. .

  The communication terminal device of the present invention is a communication terminal device capable of selectively communicating with a first communication system having a first area and a second communication system having a second area existing in the first area. Receiving means for receiving a signal including system information and position information of the second communication system, detecting means for detecting its own position, system information and position information of the second communication system contained in the received signal, and the detecting means And a selection unit that selects one communication system from the first communication system and the second communication system based on the detection result.

  According to this configuration, the communication terminal apparatus receives the signal including the system information and the position information of the second communication system (local communication system), detects its own position, and determines the system information and the position of the second communication system. In order to select one communication system from among the first communication system and the second communication system based on the information and the detected position information of the self, which communication system is used in which communication system is used. It is possible to determine whether the power consumption is low, and by selecting the communication system that has the lowest power consumption, it is possible to improve the power consumption.

  In the communication terminal device according to the present invention, in the above configuration, the signal received by the reception unit includes information for detecting the position of the device, and the detection unit detects the position of the device. A configuration is adopted in which the position of the self is detected based on information.

  According to this configuration, the detecting unit detects the position of itself based on the information for detecting the position of itself included in the signal received by the receiving unit. One communication system can be selected from the first communication system and the second communication system on the basis of the system information and the position information and the detected own position information.

  In the communication terminal device according to the present invention, in the configuration described above, the selection unit is configured to determine the first communication system and the second communication system based on system information and position information included in a received signal and a detection result of the detection unit. A configuration is adopted in which a communication system capable of a standby operation with the lowest power consumption is selected from the second communication system.

  According to this configuration, the lowest power consumption of the first communication system and the second communication system based on the position information of the communication terminal device, the system information and position information of the second communication system, and the detected own position information. Since a communication system capable of standby operation is selected, the power consumption can be improved.

  In the communication terminal device according to the present invention, in the configuration described above, the selection unit is configured to determine the first communication system and the second communication system based on system information and position information included in a received signal and a detection result of the detection unit. The second communication system is configured to select a communication system that can perform a random access operation with the lowest power consumption.

  According to this configuration, the lowest power consumption of the first communication system and the second communication system based on the position information of the communication terminal device, the system information and position information of the second communication system, and the detected own position information. Since a communication system capable of random access operations (location registration, outgoing / incoming calls) is selected, it is possible to improve power consumption.

  A base station apparatus of the present invention is a base station apparatus that communicates with the communication terminal apparatus described above by the first communication system, and a storage unit that stores system information and position information of the second communication system, A configuration having transmission means for transmitting information stored in the storage means is adopted.

  According to this configuration, since the system information and the position information of the second communication system are stored in advance and the information is transmitted to the communication terminal device, the first communication for realizing the communication terminal device described above is performed. A base station apparatus in the system can be provided.

  The mobile communication system of the present invention includes a first base station device that manages a first area by a first communication system, and a second area that exists in the first area by a second communication system. In a mobile communication system comprising two base station apparatuses and a communication terminal apparatus capable of selectively communicating with the first base station apparatus and the second base station apparatus, the first base station apparatus is configured to transmit the second communication A storage unit that stores system information and position information of the system; and a transmission unit that transmits information stored in the storage unit, wherein the communication terminal device includes system information and position information of the second communication system. Receiving means for receiving a signal including: detecting means for detecting its own position based on the received signal; and system information and position information of the second communication system included in the received signal. On the basis of the detection result of the detecting means, a configuration having a selection means for selecting one communication system from among the first communication system and the second communication system.

  According to this configuration, the first base station apparatus stores in advance the system information and position information of the second communication system, transmits these information to the communication terminal apparatus, and the communication terminal apparatus transmits the first base station. A signal including system information and position information of the second communication system (local communication system) is received from the apparatus and its own position is detected based on the received signal, and the system information and position information of the second communication system and the detected self Since one communication system is selected from the first communication system and the second communication system based on the position information of the communication system, the power consumption can be reduced by using which communication system in which communication system is used. By selecting the communication system with the lowest power consumption, it is possible to improve power consumption. Can.

  The communication system selection method of the present invention provides communication in a communication terminal apparatus capable of selectively communicating with a first communication system having a first area and a second communication system having a second area existing in the first area. A system selection method comprising: a reception step for receiving a signal including system information and position information of the second communication system; a detection step for detecting its own position; and the first signal included in the signal received by the reception step. A selection step of selecting one communication system from the first communication system and the second communication system based on the system information and position information of the two communication systems and the detection result detected by the detection step. I made it.

  According to this method, the communication terminal apparatus receives a signal including system information and position information of the second communication system (local communication system), detects its own position, and system information and position information of the second communication system. In addition, since one communication system is selected from the first communication system and the second communication system based on the detected position information of the self, the communication system in which communication system is used and which communication system is used is lower. It is possible to determine whether the power consumption is reached, and by selecting a communication system that has the lowest power consumption, it is possible to improve power consumption.

  As described above, according to the present invention, it is possible to improve power consumption.

  The gist of the present invention is that a service network area (hereinafter referred to as “local system area”) of another communication system (local communication system) exists in a service network area (hereinafter referred to as “system area”) of a certain communication system, In the area, a signal including system information and position information of the local system is received, and its own position is detected from the received signal, and is lowest based on the system information and position information of the local communication system and its own position information. By selecting a communication system that can perform a standby operation or a random access operation with power consumption, the power consumption can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an overall view showing an outline of a mobile communication system according to an embodiment of the present invention.

  The mobile communication system 100 includes a base station 110 that manages the system area 101, a local system base station 210 that manages a local system area 201 arranged in the system area 101 in a communication system different from the base station 110, and these systems. A mobile device 300 that can move in the area 101 and the local system area 201. In FIG. 1, as an example of the position of the mobile device 300, a point X within the system area 101 and outside the local system area 201 and a point Y within the local system area 201 are shown.

  In the present embodiment, there is only one local system base station having another system area in the system area 101. However, the present invention is not limited to this, and a plurality of local system base stations may exist. Good.

  FIG. 2 is a block diagram showing configurations of the base station, the local system base station, and the mobile station.

  The base station 110 shown in FIG. 2 communicates with the mobile device 300 in the system area 101 by a certain communication system, for example, a PDC system or W-CDMA system cellular system. The base station 110 includes a transmission unit 112, a reception unit 114, an antenna 116, and a local system information storage unit 118. Here, it is assumed that the base station 110 constitutes a W-CDMA system that manages the system area 101.

  The transmission unit 112 transmits downlink data including local system information to the mobile device 300 in the system area 101 managed by the base station 110 via the antenna 116 by the W-CDMA method.

  Receiving section 114 receives uplink data transmitted from mobile device 300 via antenna 116 by the W-CDMA method. The antenna 116 transmits and receives data under the control of the transmission unit 112 and the reception unit 114.

  The local system information storage unit 118 is a communication system (hereinafter referred to as “local system”) used in the local system area 201 which is an area at least partially overlapping with the system area 101 managed by the base station 110 having the local system information storage unit 118. Information) (hereinafter referred to as “local system information”).

  The local system information is system information such as a communication system used in the local system base station 210 that manages the local system area 201, position information of the local system base station 210, and the like.

  The local system information storage unit 118 supplies the stored local system information to the transmission unit 112.

  The local system base station 210 is arranged in the system area 101 and manages the local system area 201 using a communication system different from the communication system having the system area 101 (communication system of the base station 210).

  The communication system used in the local system base station 210 is a communication system having a cell radius (radius of the local system area 201) smaller than that of the system area 101 managed by the base station 110. In addition, as this communication system, when the communication system of the base station 110 is a W-CDMA cellular system, for example, a PHS (Personal Handy-phone System), a wireless LAN, and the like can be cited. Here, a wireless LAN is used, and the local system base station 210 manages communication in the local system area 201 using the wireless LAN.

  The local system base station 210 includes a transmission unit 212 that transmits downlink data, a reception unit 214 that receives uplink data, and an antenna 216.

  The mobile device 300 corresponds to a W-CDMA cellular system that is a communication system in the system area 101 and a wireless LAN in the local system area 201. By selecting these, the system area 101 and the local system area 201 are respectively selected. The base station 110 to be managed and the local system base station 210 can communicate with each other.

  That is, the mobile device 300 selects a communication system (in this case, a W-CDMA cellular system or a wireless LAN) used in each of the system area 101 and the local system area 201 and uses either communication system. Communication can be performed.

  The mobile device 300 includes a reception unit 310 that receives downlink data (signal from the outside), a transmission unit 312 that transmits uplink data, a call control unit 314 that controls the reception unit 310 and the transmission unit 312, an antenna 316, and position detection. A section 318 and a system selection section 320.

  The receiving unit 310 is configured to be able to receive via the antenna 316 using a communication system selected by the system selection unit 320 among a plurality of communication systems (here, a W-CDMA cellular system and a wireless LAN). Downlink data (signal) transmitted from both the base station 110 and the local system base station 210 is received. Then, the reception unit 310 performs the next downlink data standby operation using the selected communication system.

  The reception unit 310 includes a local system information extraction unit 311 that extracts local system information (information that the communication system of the local system base station 210 is a wireless LAN or position information of the local system base station 210) from the received downlink data. Then, the local system information extraction unit 311 outputs the extracted local system information to the system selection unit 320.

  The transmission unit 312 transmits uplink data to the outside through the antenna 316 using the communication system selected by the system selection unit 320 among a plurality of communication systems (here, W-CDMA or wireless LAN). Further, the transmission unit 312 is configured to perform a random access operation to a predetermined base station using the selected communication system.

  The call control unit 314 controls call information performed by the mobile device 300, and controls the reception unit 310 and the transmission unit 312 based on the communication system selected by the system selection unit 320.

  For example, when the communication system (W-CDMA) in the system area 101 is selected in the system selection unit 320, the call control unit 314 uses W-CDMA that has selected the reception unit 310 based on the instruction from the system selection unit 320. Control is performed so as to perform a signal waiting operation, or the transmission unit 312 is controlled to perform signal transmission by W-CDMA, here, a random access operation.

  The position detection unit 318 detects the position of the mobile device 300 based on the received signal from the base station 110 and outputs the detected position to the system selection unit 320. Specifically, for example, the self position is calculated using two elements of the time (propagation time) until the signal transmitted from the base station 110 reaches the mobile device 300 and the position information of the base station 110. To do. The former information is calculated by the mobile device 300, and the latter information is notified from the base station 110 to the mobile device 300. The position of the user can also be detected based on a predetermined signal from another system such as GPS (Global Positioning System). When GPS is used, its own position can be detected from the GPS signal received by the GPS receiver and the received signal from the base station.

  The system selection unit 320 includes the local system information extracted from the downlink data by the local system information extraction unit 311 (information that the communication system of the local system base station 210 is a wireless LAN or position information of the local system base station 210), Based on the position information of the mobile device 300 detected by the detection unit 318, a communication system for communication performed by the mobile device 300 is selected and output to the call control unit 314.

  By selecting the communication system, the call control unit 314 controls the reception unit 310 and the transmission unit 312 using the corresponding communication systems in the communication system in which the selected communication system is used. Communication such as standby operation and random access operation is performed.

  Further, in this system selection unit 320, based on the input information, the base station 110 or the local system base station 210 that is the closest to the mobile device 300, or actually the mobile device 300. Control is performed so as to communicate with the base station that manages the system area in which is located.

  Next, a standby operation in the mobile device 300 of the mobile communication system 100 configured as described above will be described with reference to FIG.

  For example, when the mobile device 300 is at the point X, the mobile device 300 can determine that the mobile device 300 is outside the local system area 201 from the position detected by the position detection unit 318 (see FIG. 2). The control unit 310 is controlled to perform a standby operation in a communication system (W-CDMA cellular system) that manages the system area 101.

  When the mobile device 300 is in the system area 101, the mobile device 300 always receives a signal including the local system information from the base station 110. Therefore, the mobile device 300 performs communication by the communication system in the system area 101 and the local system. Since information is always input, the local system is constantly monitored.

  When the mobile device 300 moves from the system area 101 to the local system area 201, such as when the mobile device 300 moves from the location X to the location Y, the position detection unit 318 and the local system information extraction unit Based on the local system information extracted from the received data by 311, it can be determined that the mobile device 300 itself enters the local system area 201 from the position (point X). The communication system (wireless LAN) for managing the local system system area 201 is selected, and the call control unit 314 controls the reception unit 320 to select the standby operation in the communication system (wireless LAN) for managing the local system system area 201. it can.

  Further, when in the system area 101 and the local system area 201 (point Y), the distance from the mobile device 300 is the highest among the base station 110 and the local base station 210 based on the information input to the system selection unit 320. A communication system used in a nearer base station (here, the local system area 201) is selected, and communication is performed using the selected communication system. As described above, since communication is performed with a base station (here, the local system area 201) that is close to the mobile device 300, the power consumption is reduced, and a communication system that can stand by with lower power consumption is selected. You can also.

  This selection may be determined by information included in advance in the local system information extracted from the received signal. According to this configuration, it is possible to perform control so as to select a system that can stand by with lower power consumption.

  In addition, an operation for selecting a communication system capable of random access in the mobile device 300 of the mobile communication system 100 configured as described above will be described.

  A feature of selecting a communication system capable of random access in the mobile device 300 is that a communication system with the lowest power consumption is selected.

  For example, when the mobile device 300 is in the system area 101 and the local system area 201 (point Y shown in FIG. 1), the base station 110 that manages the system area 101 and the local system base station 210 that manages the local system area 201 Any of these can be randomly accessed.

  In this case, if the power consumption during the random access operation is different, it is desirable to select and transmit a system with lower power consumption. In general, transmission with lower power consumption is possible when the distance from the base station is shorter. Therefore, the system selection unit 320 selects a communication system used in the base station closer to the mobile device 300 (the local system base station 210 because the mobile device 300 is at the point Y), and performs call control on a signal to that effect. By outputting to the unit 314, the transmission unit 312 can perform random access with reduced power consumption, that is, a random access operation to the local system base station 210.

  As described above, according to the present embodiment, it is possible to perform control so as to select a system capable of random access operation with lower power consumption.

  That is, according to the present embodiment, a standby operation and a random access operation are included in the system areas 101 and 201 under the management of a plurality of different communication systems easily and without delay, with the lowest power consumption. It is possible to automatically switch to a communication system capable of communication, and to increase the standby time.

  Therefore, unlike conventional systems, there is no reduction in standby time when manually selecting a communication system to wait for, and power consumption is reduced due to a delay corresponding to the search time when searching each communication system periodically. There is no increase.

  In addition, when the communication system is selected by the system selection unit 320 of the present embodiment, a communication system that can stand by with the lowest power consumption may be selected based on the battery state of the mobile device 300.

  For example, the mobile device 300 includes a rechargeable battery and a power supply circuit, and supplies a driving voltage to each unit in the mobile terminal device, and the remaining amount of the battery is detected at a certain period, and the detection is performed. A configuration is provided in which a remaining battery level detection unit that outputs the remaining battery level to the system selection unit is provided. Then, the system selection unit having the above configuration further compares the value of the remaining battery level input from the remaining battery level detection unit with a preset threshold value, and consumes less power when the remaining battery level is smaller than the threshold value. This can be realized by selecting a communication system and providing a function for outputting to the call control unit 314.

  In the present embodiment, the mobile communication system 100 has a configuration in which one local system (in this case, a wireless LAN) that is a communication system different from the communication system managed by the base station 110 exists. However, the present invention is not limited to this, and a plurality of communication systems may exist. For example, the mobile communication system 100 may have a plurality of wireless LANs. In addition, the plurality of communication systems existing in the mobile communication system are not limited to the wireless LAN, and any communication system may be used as long as the communication system is different from the mobile communication system 100.

  The communication terminal device, the base station device, the mobile communication system, and the communication system selection method according to the present invention have the effect of improving the power consumption, and there is another communication system in one communication system. It is useful as a system that can selectively communicate with the plurality of communication systems.

1 is an overall view showing the configuration of a mobile communication system according to an embodiment of the present invention. FIG. 1 is a block diagram illustrating configurations of a base station, a local system base station, and a mobile station that constitute the mobile communication system shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Mobile communication system 101 System area 110 Base station 112 Transmission part 118 Local system information storage part 201 Local system area 210 Local system base station 300 Mobile station 310 Reception part 311 Local system information extraction part 312 Transmission part 314 Call control part 318 Position Detection unit 320 System selection unit

Claims (7)

In a communication terminal apparatus capable of selectively communicating with a first communication system having a first area and a second communication system having a second area existing in the first area,
Receiving means for receiving a signal including system information and position information of the second communication system;
Detection means for detecting the position of the self;
Selection means for selecting one communication system from among the first communication system and the second communication system based on the system information and position information of the second communication system included in the received signal and the detection result of the detection means. When,
Having
A communication terminal device. The signal received by the receiving means includes information for detecting the position of itself.
The detection means detects the position of the self based on information for detecting the position of the self;
The communication terminal device according to claim 1. The selection means is the lowest power consumption of the first communication system and the second communication system based on the system information and position information of the second communication system and the detection result of the detection means included in the received signal. Select a communication system that can operate in standby mode.
The communication terminal device according to claim 1. The selection means is the lowest power consumption of the first communication system and the second communication system based on the system information and position information of the second communication system and the detection result of the detection means included in the received signal. Select a communication system capable of random access operation,
The communication terminal device according to claim 1. A base station apparatus that communicates with the communication terminal apparatus according to claim 1 by the first communication system,
Storage means for storing system information and position information of the second communication system;
Transmitting means for transmitting information stored in the storage means;
A base station apparatus comprising: A first base station device managing a first area by the first communication system;
A second base station apparatus for managing a second area existing in the first area by a second communication system;
A communication terminal device capable of selectively communicating with the first base station device and the second base station device;
In a mobile communication system comprising:
The first base station apparatus
Storage means for storing system information and position information of the second communication system;
Transmission means for transmitting the information stored in the storage means,
The communication terminal device
Receiving means for receiving a signal including system information and position information of the second communication system;
Detection means for detecting the position of itself based on the received signal;
Selection for selecting one communication system from among the first communication system and the second communication system based on the system information and position information of the second communication system and the detection result of the detection means included in the received signal Means,
A mobile communication system characterized by comprising: A communication system selection method in a communication terminal apparatus capable of selectively communicating with a first communication system having a first area and a second communication system having a second area existing in the first area,
Receiving a signal including system information and position information of the second communication system;
A detection step for detecting the position of the self;
Based on the system information and position information of the second communication system included in the signal received by the reception step and the detection result detected by the detection step, one of the first communication system and the second communication system is selected. A selection step of selecting a communication system;
A communication system selection method characterized by comprising:

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