JP2009111776A - Radio communication terminal and control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique of starting communication smoothly with the counterpart terminal in an ad-hoc mode while suppressing power consumption of the own terminal. <P>SOLUTION: A terminal (100) includes: a first communication part (100) for performing wide-range radio communication with another radio terminal through a radio base station; a second communication part (100) for dedicated narrow-range radio communication with another radio terminal; a message transmission part (100) for transmitting a message requesting the start of dedicated narrow-range radio communication to another radio terminal by the first communication part through a base station; and a control part (100) for controlling so as to connect to another radio terminal using the second communication part after transmitting the message. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radio communication terminal and a control method thereof, and more particularly to a radio communication terminal and a control method thereof capable of smoothly starting communication with a counterpart terminal in an ad hoc mode while suppressing power consumption of the terminal.

  Conventionally, a wireless LAN (WLAN) system includes an infrastructure mode (FIG. 20) in which communication is performed via an access point (AP) as a relay station and an ad hoc mode (FIG. 21) in which wireless LAN communication is performed directly between terminals. There are two modes: Therefore, as shown in both figures, the wireless terminals TM1-3 that support the wireless LAN can operate in these two modes depending on the situation. For example, in FIG. 20, the wireless terminals TM1 and TM2 are within the communicable range of the WLAN access point, and the wireless terminal TM1 and the wireless terminal TM2 are communicating in the infrastructure mode via the access point (AP). . On the other hand, in FIG. 21, since the wireless terminal TM2 is located in the WLAN ad hoc communicable area of the wireless terminal TM1, the wireless terminal TM1 and the wireless terminal TM2 do not pass through the access point (AP) and are in the ad hoc mode. Communicating with

  In addition, SMS (Short Message Service) message transmission that allows simple data exchange on the standby channel without establishing a dedicated communication channel in the cellular network (cellular phone network) of conventional wide area wireless communication systems There is a technology (refer to Patent Document 1). With the development of communication technology, one wireless terminal connects to a cellular network with a first communication means (wide area communication connection function) and a second communication means (WLAN connection function) that enables terminals to connect with each other. It has become possible to have

  In WLAN ad hoc mode, since terminals can communicate without going through AP, there is an advantage that they can always communicate as long as the distance between each other's terminals is close, but in advance, each terminal starts communication in ad hoc mode and communicates with the other party in advance. Needed to have authentication information. Therefore, there is a problem that ad hoc communication cannot be performed unless at least two wireless terminals TM1 and TM2 can communicate with each other (FIG. 22). As shown in FIG. 22, when there are rooms R1 and R2 and the users of the two wireless terminals TM1 and TM2 are located in one room R1, it is easy for both users to communicate with each other. It is possible to start communication in ad hoc mode. On the other hand, in the case of FIG. 23, there is a wall WL between the wireless terminal TM1 located in the room R1 and the wireless terminal TM2 located in the room R2, and the wall WL becomes a visual obstacle. Both users who use the respective terminals cannot communicate with each other.

  Thus, for example, when the distance between each other is within a range where communication with a wireless LAN device is possible but communication is not possible with each other (FIG. 23), one (wireless terminal TM1) starts communication in the WLAN ad hoc mode. When desiring to do so, in the hope that the other party (wireless terminal TM2) is operating in the ad hoc mode, there is no choice but to start in the ad hoc mode and try to start communication. In this case, it is unlikely that the partner terminal is operating in the ad hoc mode, and it is unlikely that communication in the ad hoc mode can be started. Will consume. Or when a terminal waits for another terminal in ad hoc mode, it will continue to consume useless electric power similarly.

  In addition, when a mobile terminal performs a channel scan to try to start ad hoc communication, or when waiting for another terminal, in many cases, the mobile terminal intermittently scans or waits to reduce power consumption. In such a case, even if two terminals exist in the ad hoc communication enabled area, ad hoc communication cannot be established unless the scanning and standby timings coincide with each other. In particular, in the case of a portable terminal, since it is necessary to suppress the power consumption of the battery, the scan time and the transmission time are often set short, and conversely the pause time is often set long. In such a case, the timing of reception and transmission between terminals, or the channel and frequency used for reception and transmission become more difficult to match, making ad hoc construction even more difficult.

Also, it is necessary to notify each other's authentication information necessary for establishing ad hoc communication in advance. As a countermeasure against this point, there is a method of performing authentication once via a cellular network (see Patent Document 2). Using this method, the receiving terminal can grasp that the calling terminal is not an unauthorized terminal, but it cannot use authentication information individually set by the user. The decision of whether or not is unknown at the certification stage.
Japanese Unexamined Patent Publication No. 2000-232533 Special Table 2005-530444

  As described above, even in an environment where terminals can communicate in the ad hoc mode, a mechanism has been developed in which both terminals smoothly start communication with the desired counterpart terminal in the ad hoc mode without consuming power. Absent. In particular, wireless terminals equipped with / mounted with communication modules for cellular networks and wireless LAN networks (especially for ad hoc communication) have become practical as communication circuits / modules become smaller and less expensive However, a framework for smoothly starting ad hoc communication while minimizing power consumption has not been developed. In addition, if a nearby terminal can communicate by ad hoc communication, the user of the communication terminal is able to charge communication costs and communication speed (usually that of ad hoc communication over cellular network communication speed). On the other hand, the telecommunications carrier has the advantage of reducing the consumption of the frequency band of the cellular network.

  Therefore, an object of the present invention is to provide a technique (terminal, method) for smoothly starting communication with a counterpart terminal in an ad hoc mode while suppressing power consumption of the terminal.

In order to solve the above-described problems, the wireless communication terminal according to the first invention is
A first communication unit that performs wide-area wireless communication with another wireless terminal via a wireless base station;
A second communication unit that performs narrow-area wireless communication with another wireless terminal;
A message transmission unit that transmits a message requesting the start of narrow-area wireless communication by the second communication unit to the other wireless terminal via the base station by the first communication unit;
A control unit for controlling to connect to the other wireless terminal using the second communication unit after transmitting a message requesting the start of the narrow-band wireless communication;
With
The narrow-area wireless communication is a communication method such as wireless LAN, Bluetooth (registered trademark), and IrDA, which has a lower output than cellular communication that is wide-area wireless communication.

The wireless communication terminal according to the second invention is
A message requesting the start of the narrow area wireless communication is
Including a specific wireless LAN standard (802.11a, b, g, etc.) that the terminal desires to connect, channel information in the wireless LAN standard, and a search start time and a search interval,
The controller is
Controlling to search for the other wireless terminal using the second communication unit at the search interval from the search start time;
It is characterized by that.

A wireless communication terminal according to the third invention is
A first communication unit that performs wide-area wireless communication with another wireless terminal via a wireless base station;
A second communication unit that performs narrow-area wireless communication with another wireless terminal;
A message receiving unit that receives a message requesting the start of narrowband wireless communication from the other wireless terminal by the first communication unit;
A control unit for controlling to connect to the other wireless terminal using the second communication unit based on a message requesting the start of the narrow-area wireless communication received by the message receiving unit;
With

A wireless communication terminal according to the fourth invention is
A message requesting the start of the narrow area wireless communication is
Including a specific wireless LAN standard (802.11a, b, g, etc.) that the terminal desires to connect, channel information in the wireless LAN standard, and a search start time and a search interval,
The controller is
Controlling to search for the other wireless terminal using the second communication unit at the search interval from the search start time;
It is characterized by that.

  As described above, the solution of the present invention has been described as an apparatus. However, the present invention can be realized as a method, a program, and a storage medium storing the program, which are substantially equivalent to these. It should be understood that these are also included. Each step of the following methods and programs uses an arithmetic processing unit such as a CPU or DSP as needed for data processing. The input data, processed / generated data, etc. It is stored in a storage device such as an HDD or a memory.

For example, the control method of the wireless communication terminal according to the fifth aspect of the present invention, which is realized as a method,
Performing wide-area wireless communication with other wireless terminals via a wireless base station;
Performing narrow-area wireless communication with other wireless terminals;
Transmitting a message requesting the start of narrow area wireless communication to another wireless terminal via the base station by the wide area wireless communication;
After transmitting a message requesting the start of the narrowband wireless communication, controlling to connect to the other wireless terminal using the narrowband wireless communication;
Have

A control method for a wireless communication terminal according to the sixth invention is:
Performing wide-area wireless communication with other wireless terminals via a wireless base station;
Performing narrow-area wireless communication with other wireless terminals;
Receiving a message requesting the start of narrow-band wireless communication from the other wireless terminal by the first communication unit;
Controlling to connect to the other wireless terminal using the second communication unit based on the message requesting the start of the narrow-area wireless communication received by the message receiving unit;
Have

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to start communication smoothly with an other party terminal in ad hoc mode, suppressing the power consumption of a terminal.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention relates to a wireless communication terminal including a first communication unit capable of wide-area wireless communication and a second communication unit capable of ad-hoc communication and capable of wireless LAN communication which is narrow-area wireless communication. However, an embodiment in which the present invention is applied to a mobile phone terminal that is a terminal connectable to a cellular network (mobile phone network) that is a typical wide-area wireless communication system will be described.

  FIG. 1 is a block diagram showing a basic configuration of a terminal according to an embodiment of the present invention. As illustrated, the terminal 100 includes a CDMA communication unit (first communication unit) 110, a WLAN communication unit (second communication unit) 120, a control unit 130, a storage unit 140, an ad hoc connection processing unit 150, and an input unit. 160 and a display unit 170. In addition, the terminal 100 includes a CDMA communication unit (first communication unit) 110 that communicates via a mobile phone network that uses a CDMA system (for example, 1x, EV-DO, etc.) that is a wide area wireless communication, and a narrow area wireless communication. Each antenna further includes a WLAN communication unit (second communication unit) 120 that communicates via a certain wireless LAN. The terminal 100 further includes a GPS unit and a GPS control unit (not shown).

  The control unit 130 controls the entire terminal, and includes a CDMA control unit 131, a WLAN control unit 132, and an SMS communication unit (message transmission unit, response transmission unit, response reception unit) 133. The CDMA control unit 131 controls communication with a counterpart terminal (another CDMA terminal) via the antenna by the CDMA communication unit 110. The WLAN control unit controls communication with the counterpart terminal (another WLAN terminal) via the antenna by the WLAN communication unit 120. Further, the terminal 100 can accurately acquire the current position information (latitude, longitude, altitude) of the terminal itself using a GPS control unit and a GPS unit (not shown). It is used to determine whether or not the own terminal or both terminals exist in the ad hoc communication possible area.

  In terminal 100, in order to synchronize the WLAN search timing with the counterpart terminal, terminal 100 receives the 1x Sync signal as a CDMA synchronization signal, and uses this synchronization signal to synchronize the search timing with the counterpart terminal. take. Alternatively, the terminal 100 may synchronize using GPS, NTP (Network Time Protocol), or long wave JJY (time signal radio wave by a standard time signal station).

  The storage unit 140 includes an ad hoc connection information storage area 141 and a local terminal connection information storage area 142. Each storage area stores data acquired, calculated, or used by each unit of the control unit and the ad hoc connection processing unit 150.

  Also, the own terminal connection information storage area 142 stores several search lists shown in Tables 1 and 2 below, and transmits them to the partner terminal, so that the search list of the own terminal and the partner terminal By comparing with those of the wireless LAN, it is possible to know the WLAN system, search order, search timing, and frequency / channel that can be used with each other. The search list can also include search intervals (signal transmission duration, pause time, start time, end time, maximum number of trials, etc.). Therefore, if such a search list can be shared with each other and the processing can be synchronized between the two terminals, the ad hoc network can be used very smoothly when both terminals exist in an area where ad hoc communication is possible. It becomes possible to complete the construction. In addition, since the conditions of both terminals do not match, even when the terminal breaks down, the process can be completed very smoothly, so that useless power is not consumed.

2 to 12 show conceptual diagrams of ad hoc construction by the parent (terminal) P1 and the child (terminal) C1. Here, the parent P1 and the child C1 operate under the following conditions.
The parent P1 is a parent information area PF1 (corresponding to the own terminal connection information storage area 142 in FIG. 1) and a parent ad hoc information area PF2 (corresponding to the ad hoc connection information storage area 141 in FIG. 1). have. The child C1 has a child information area CF1 (corresponding to the own terminal connection information storage area 142 in FIG. 1) and a child ad hoc information area CF2 (corresponds to the ad hoc connection information storage area 141 in FIG. 1). And have. The contents of the parent ad hoc information area PF2 and the child ad hoc information area CF2 are updated according to the connection status and the connection stage.
・ For WLAN search start time, enter the nearest time for WLAN search when sending SMS messages.
-The WLAN search timing is set at 10-second intervals (set a value sufficient for searching, for example, repeating a 3-second search and a 7-second pause).
The WLAN search information is described when stored in the storage unit of the terminal in advance, but the information may be obtained later by communication.
-WLAN security information is WEP (Wired Equivalent Privacy) (however, there is no need to specify)
In the embodiment, the number of trial stop determinations is 14 (assuming a total search time of about 3 minutes and a waiting time).
-In an ad hoc network, two or more terminals become a parent or a child and constitute a network.
-Here, the case where an ad hoc is formed with a parent and child is taken as an example. The terminals that exchange security information such as e-mail address, telephone number, SSID (Service Set Identifier), WEP, etc. are parent and child.

<Connection operation from child to parent (FIGS. 2 to 4)>
FIG. 2-4 is a diagram for explaining a network configuration when building an ad hoc from the child (terminal) C1 to the parent (terminal) P1. Of course, the ad hoc construction from the parent P1 to the child C1 can be constructed in the same manner only by the reverse operation. The operation of the child C1 will be described.
(1). As shown in FIGS. 2 and 3, when connecting from the child C1 to the parent P1, the SMS message including the WLAN search information stored in the child information area CF1 is sent to the access point AP1 and the SMS server SS. To the parent P1.
(2). When the SMS message indicating OK is returned from the parent P1, the child C1 starts a WLAN search using the WLAN search information of the own terminal stored in the child information area CF1.
(3). When the child C1 receives an SMS message including the WLAN search information stored in the parent information area PF1 from the parent P1, the use status of the WLAN, the connection status to the CDMA network, whether or not the user can accept it. Whether or not to accept ad hoc communication from the parent P1 is determined by an operation or the like (OK or NG).
(4). When the child C1 determines that the acceptance is OK (possible), the child C1 transmits an SMS message indicating OK to the parent P1, and uses the parent P1 WLAN search information as the ad hoc connection information of this time for the child Stored in the ad hoc information area CF2.
(5) When the child C1 determines that the acceptance is NG (impossible), the child C1 transmits an SMS message indicating a break (BreakDown) to the parent P1, and terminates the current connection.
(6). As shown in FIG. 4, the child C1 starts the search at the WLAN search start time designated by itself or the parent.
(7). If the ad hoc communication partner is not found in the WLAN search, the child C1 repeats the WLAN search a predetermined number of times.
(8). If the child C1 is not found even after repeating a predetermined number of times in the WLAN search, or if it is within the CDMA network range, the child C1 transmits an ad hoc disconnection request using an SMS message. If it is out of the CDMA network range, the process ends.
(9). The child C1 constructs an ad hoc with the partner parent P1 when the partner parent P1 is found in the WLAN search within a predetermined number of times.

<Parent action (FIGS. 2 to 4)>
(1). As shown in FIG. 3, after receiving the SMS message including the WLAN search information from the child C1, the parent P1 uses the WLAN usage status, the connection status to the CDMA network, the acceptability operation by the user, and the parent information. Whether to accept ad hoc communication from the child C1 is determined according to conditions such as own WLAN search information stored in the area PF1.
(2). If acceptance is OK, the parent P1 transmits an SMS message indicating OK to the child, and uses the child WLAN search information received from the child C1 as the current ad hoc connection information, and the parent ad hoc information area PF2. And use this information to perform a WLAN search.
(3). If the acceptance is NG, the parent P1 transmits an SMS message including its own WLAN search information stored in the parent information area PF1 to the child C1.
(4). When an SMS message indicating OK is returned, the parent P1 starts a WLAN search using its own WLAN search information.
(5). When the SMS message indicating the break (BreakDown) is returned from the child C1, the parent P1 ends the current connection.
(6). As shown in FIG. 4, the parent P1 starts the search at the WLAN search start time designated by itself or the child C1.
(7). When the parent P1 does not find an ad hoc communication partner in the WLAN search, it repeats the WLAN search a predetermined number of times.
(8). If the parent P1 is not found even after repeating the predetermined number of times in the WLAN search, or if it is within the CDMA network range, the parent P1 transmits an ad hoc disconnection request using an SMS message. If it is out of the CDMA network range, the process ends.
(9). The parent P1 constructs an ad hoc when the partner child C1 is found in the WLAN search within a predetermined number of times.

<Operation at the time of out-of-service transition after ad hoc construction (FIGS. 5 to 8 (the same operation for both parent and child))>
(1). After the ad hoc communication is established as shown in FIG. 5, the parent P1 and the child C1 are out of the communication area as shown in FIG.
(2). Then, as shown in FIG. 7, a WLAN search is performed using the WLAN search information used for ad hoc construction before transitioning to the outside of the service area.
(3). The parent P1 and the child C1 perform a WLAN search, and when an opponent is found, reconstruct the ad hoc as shown in FIG.
(4). If the parent P1 and the child C1 are not found even after repeating the WLAN search a predetermined number of times, and if they are within the CDMA network range, the parent P1 and the child C1 transmit an ad hoc disconnection request using an SMS message. If it is out of the CDMA network range, the process ends.

<Disconnecting operation during ad hoc construction (FIGS. 9 and 10 (the same operation for both parent and child))>
(1). The parent P1 that is to be disconnected transmits an ad hoc disconnection request to the child C1 that is the partner to be disconnected using the WLAN communication unit (WLAN interface).
(2). After receiving the ad hoc disconnection request, the child C1 transmits an ad hoc disconnection response, disconnects the ad hoc, and deletes the current ad hoc connection information. In addition, when using the information of the own terminal, it is not deleted.
(3). After receiving the ad hoc disconnection response, the parent P1 that is to be disconnected disconnects the ad hoc and deletes the current ad hoc connection information, that is, discards the contents of the parent ad hoc information area PF2. If you are using your own information, do not delete it.
(4). When there is no response time (for example, 10 seconds) in response to the ad hoc disconnection request, or when it is within the CDMA network range, as shown in FIG. 10, the parent P1 is the access point AP1 and the SMS server. An ad hoc disconnection request is transmitted to the child C1 by an SMS message via the SS. Or, if you are outside the CDMA network range, forcibly disconnect.

  FIG. 11 is a diagram for explaining the status of ad hoc disconnection completion. As shown in the figure, when a WLAN search for ad hoc connection is attempted a predetermined number of times and a signal from the partner terminal cannot be captured, a disconnection process is executed, and both the parent P1 and the child C1 are ad hoc. The information in the information areas PF2 and CF2 is discarded, and the process ends.

  FIG. 12 is a diagram for explaining the status of completion of ad hoc disconnection. As shown in the figure, when the ad hoc disconnection is completed, the information in the ad hoc information areas PF2 and CF2 is discarded for both the parent P1 and the child C1, and no information is stored there.

  2 to 12 conceptually describe the processing performed by each terminal and the transition of information in the storage area at that time, but in FIG. 13 to FIG. 15, the processing sequence of each terminal is more accurately expressed in time series. explain.

  FIG. 13 is a sequence diagram (embodiment using child WLAN search information) for explaining ad hoc construction by a parent (terminal) P1 and a child (terminal) C1. First, the child C1 transmits an ad hoc connection request (SMS message including WLAN search information) to the parent P1 via an access point (such as a base station) (not shown) and the SMS server SS. The parent P1 receives this ad hoc connection request and determines whether or not to accept the ad hoc connection request mainly based on the WLAN search information included in the ad hoc connection request. In FIG. 13, the parent P1 determines to accept the ad hoc connection request, and similarly transmits an ad hoc connection response (OK) to the child C1 via the access point (base station or the like) and the SMS server SS.

  The parent P1 stores the WLAN search information included in the ad hoc connection request received from the child C1 as “current ad hoc connection information” in the ad hoc information area. Thereafter, the parent P1 tries an ad hoc connection process based on “current ad hoc connection information”, that is, “child WLAN search information” stored in the ad hoc information area (details will be described later with reference to FIG. 17). ). On the other hand, after receiving the ad hoc connection response (OK), the child C1 attempts an ad hoc connection using the WLAN search information of the own terminal (details will be described later with reference to FIG. 16). Since the parent P1 and the child C1 share WLAN search information and search for a communication partner at the same channel, frequency, and the same timing, an ad hoc can be constructed extremely smoothly (that is, in a short time).

  FIG. 14 is a sequence diagram (embodiment using parent WLAN search information) for explaining ad hoc construction by a parent (terminal) P1 and a child (terminal) C1. First, the child C1 transmits an ad hoc connection request (SMS message including WLAN search information) to the parent P1 via an access point (such as a base station) (not shown) and the SMS server SS. The parent P1 receives this ad hoc connection request and determines whether or not to accept the ad hoc connection request mainly based on the WLAN search information included in the ad hoc connection request. In FIG. 14, when the ad hoc connection based on the child WLAN search information is impossible, the parent P1 determines to reject the ad hoc connection request, and the ad hoc connection request including the WLAN information to which the parent P1 can connect ( Information that rejects the child request (NG) and the parent WLAN search information) is transmitted to the child C1 via the access point (base station, etc.) and the SMS server SS. The child C1 determines whether or not to accept the ad hoc connection request based on the “parent WLAN search information” included in the ad hoc connection request received from the parent P1. In this case, the child C1 determines that it accepts the ad hoc connection request, and similarly transmits an ad hoc connection response (OK) to the parent P1 via the access point (base station or the like) and the SMS server SS.

  The child C1 stores the WLAN search information included in the ad hoc connection request received from the parent P1 in the ad hoc information area as “current ad hoc connection information”. Thereafter, the child C1 tries an ad hoc connection process based on “current ad hoc connection information”, that is, “parent WLAN search information” stored in the ad hoc information area (details will be described later with reference to FIG. 17). ). On the other hand, after receiving the ad hoc connection response (OK), the parent P1 attempts an ad hoc connection using the WLAN search information of the own terminal (details will be described later with reference to FIG. 16). Since the parent P1 and the child C1 share WLAN search information and search for a communication partner at the same channel, frequency, and the same timing, an ad hoc can be constructed extremely smoothly (that is, in a short time).

  FIG. 15 is a sequence diagram for explaining the failure of ad hoc construction by the parent (terminal) P1 and the child (terminal) C1 (embodiment in which both conditions do not match and breaks). That is, if both sides cannot establish an ad-hoc connection based on the WLAN search information included in the Ad-hoc connection request or the Ad-hoc connection response from the other terminal, both start a search for the other terminal. Since the processing ends without any unnecessary search operation, unnecessary power consumption is not required.

  FIG. 16 is a flowchart illustrating a process when a terminal performs ad hoc connection using its own WLAN search information according to an embodiment of the present invention. As shown in the figure, in step S11, the user's own WLAN connection information (WLAN search information) is recorded in the ad hoc information area as “current ad hoc connection information”. In step S12, a WLAN search loop is started. In step S13, a WLAN search is performed. At this time, "current ad hoc connection information" stored in the ad hoc information area is used. If an ad hoc communication partner is found in step S14, the process goes out of the loop, and in step S15, an ad hoc is constructed with the communication partner, and the process ends. If no communication partner is found, the loop is repeated until a predetermined loop end condition (such as the number of trials) is satisfied. If the loop end condition is satisfied in step S16, it is determined in step S17 whether or not the own terminal exists within the CDMA network area. If it exists within the CDMA network area, the process proceeds to step S18, and an SMS message including an ad hoc disconnect request is transmitted. If not, in step S19, the ad hoc is forcibly disconnected. Thereafter, in step S20, the “current ad hoc connection information” stored in the ad hoc connection area is deleted, and the process ends.

  FIG. 17 is a flowchart showing processing when the terminal according to an embodiment of the present invention performs ad hoc connection using the WLAN search information of the other party (parent or child). As shown in the figure, in step S31, a WLAN search loop is started. In step S32, a WLAN search is performed. At this time, “current ad hoc connection information” including the WLAN search information of the other party stored in the ad hoc information area is used. If an ad hoc communication partner is found in step S33, the process exits the loop and constructs an ad hoc with the communication partner in step S34 and ends the process. If no communication partner is found, the loop is repeated until a predetermined loop end condition (such as the number of trials) is satisfied. If the loop end condition is satisfied in step S35, it is determined in step S36 whether or not the own terminal exists within the CDMA network area. If it exists within the CDMA network area, the process proceeds to step S37, and an SMS message including an ad hoc disconnect request is transmitted. If not, in step S38, the ad hoc is forcibly disconnected. Thereafter, in step S39, the “current ad hoc connection information” stored in the ad hoc connection area is deleted, and the process ends.

  FIG. 18 is a flowchart showing processing when a terminal according to an embodiment of the present invention transitions out of service area after ad hoc construction. As shown in the figure, it is determined in step S51 whether or not an ad hoc is being constructed. If the ad hoc is being constructed, an ad hoc disconnect request is transmitted by the WLAN communication unit (WLAN interface) in step S52. Thereafter, it continues to check whether or not an ad hoc disconnection response has been received until a time-out occurs (until the set predetermined time) (steps S53 and S54). If an ad hoc disconnection response has been received, the process proceeds to step S61, in which the “current ad hoc connection information” in the ad hoc connection area is deleted and the process ends. If a time-out occurs in step S54, the process proceeds to step S56 to determine whether or not an ad hoc partner terminal has been searched a predetermined number of times. If the search has been performed a predetermined number of times, the ad hoc is forcibly disconnected in step S57, and the process proceeds to step S61.

  If it is determined in step S51 that the ad hoc is not being constructed, it is determined in step S55 whether or not it is within the CDMA network range. If it is not within the CDMA network range, the process of step S56 is performed. If it is within the CDMA network area, in step S58, an SMS message including an ad hoc disconnect request is transmitted to the partner terminal. Thereafter, it continues to check whether or not an ad hoc disconnection response has been received (steps S59, S60) until a time-out occurs (until the set predetermined time). If an ad hoc disconnection response has been received, the process proceeds to step S61, in which the “current ad hoc connection information” in the ad hoc connection area is deleted and the process ends. If a time-out occurs in step S60, the process proceeds to step S56 and the above-described processing is performed.

  FIG. 19 is a flowchart illustrating processing of a terminal that has received a transmitted ad hoc disconnection request according to an embodiment of the present invention. As shown in the figure, in step S71, it is determined whether or not an ad hoc is being constructed. If the ad hoc is being constructed, an ad hoc disconnection response is transmitted to the sender's counterpart terminal in the WLAN communication unit (WLAN interface) in step S72. Next, in step S77, “current ad hoc connection information” in the ad hoc connection area is deleted, and the process ends. If the ad hoc is not being constructed, it is determined in step S73 whether or not it is within the CDMA range. If it is within the CDMA area, in step S74, an SMS message including an ad hoc disconnection request is transmitted, and the process proceeds to step S77 to delete “current ad hoc connection information” and end the process. If not, it is determined in step S75 whether or not an ad hoc counterpart terminal has been searched a predetermined number of times. If the search has been performed a predetermined number of times, the ad hoc is forcibly disconnected in step S77, the process proceeds to step S77, the “ad hoc connection information of this time” is deleted, and the process ends.

  As described above, according to the present invention, the ad hoc can be formed, disconnected, etc. by matching the timing of connection, disconnection, scanning, etc. with the partner terminal forming the ad hoc, or setting the channel, frequency, etc. in the SMS message. It becomes possible to carry out smoothly. In the conventional method, when ad-hoc communication is formed with a portable terminal, if a single manual or automatic scan fails, ad-hoc cannot be formed unless another operation is performed. For this reason, when it was momentarily out of range, it was not possible to return smoothly. However, according to the present invention, even when transitioning to the outside of the service area, since the other party's scan timing, scan order, frequency / channel setting, etc. are known in advance, when ad hoc reconstruction is performed, SMS or e-mail It is possible to easily and smoothly perform ad hoc reconstruction without using the. In addition, according to the present invention, ad hoc construction is realized while suppressing battery consumption of the mobile terminal by intermittently transmitting radio waves while synchronizing between terminals as described in the search list Is possible.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each unit, each means, each step, etc. can be rearranged so as not to be logically contradictory, and a plurality of means, steps, etc. can be combined or divided into one. It is. For example, although the embodiment has been described with respect to a mode in which a search list is transmitted, a PRL (Preferred Roaming List) may be transmitted instead of the search list. Furthermore, in the embodiment, the embodiment has been described in which the SMS message is transmitted / received via the SMS server. However, the present invention can also be realized by other aspects such as transmission / reception of the electronic mail via the electronic mail server.

  In the embodiment, the position information is acquired by the GPS unit. However, the position information may be calculated or acquired based on base station or cell information. In the embodiment, the wireless LAN device is activated and set to the ad hoc mode before sending the SMS message. However, after receiving the response of the SMS message that accepts the ad hoc incoming call from the other terminal, the wireless LAN device is turned on. It may be activated and set to ad hoc mode. In the embodiments, the wireless LAN has been described as an example of the narrow area wireless communication capable of ad hoc communication. However, the present invention can be applied to other narrow area wireless communication as long as the ad hoc communication is possible.

It is a block diagram which shows the basic composition of the terminal by one embodiment of this invention. It is a conceptual diagram of the ad hoc construction by the parent P1 and the child C1. It is a conceptual diagram of the ad hoc construction by the parent P1 and the child C1. It is a conceptual diagram of the ad hoc construction by the parent P1 and the child C1. It is a conceptual diagram of the ad hoc construction by the parent P1 and the child C1. It is a conceptual diagram of the ad hoc construction by the parent P1 and the child C1. It is a conceptual diagram of the ad hoc construction by the parent P1 and the child C1. It is a conceptual diagram of the ad hoc construction by the parent P1 and the child C1. It is a conceptual diagram of the ad hoc construction by the parent P1 and the child C1. It is a conceptual diagram of the ad hoc construction by the parent P1 and the child C1. It is a conceptual diagram of the ad hoc construction by the parent P1 and the child C1. It is a conceptual diagram of the ad hoc construction by the parent P1 and the child C1. It is a sequence diagram explaining the ad hoc construction by the parent P1 and the child C1 (embodiment using the WLAN search information of the child). It is a sequence diagram explaining the ad hoc construction by parent P1 and child C1 (embodiment using parent WLAN search information). It is a sequence diagram explaining the failure of the ad hoc construction by the parent P1 and the child C1 (an embodiment in which both conditions do not match and breaks). It is a flowchart which shows the process in case a terminal implements an ad hoc connection using own WLAN search information. It is a flowchart which shows the process in case the terminal by one embodiment of this invention implements an ad hoc connection using the WLAN search information of the other party (parent or child). It is a flowchart which shows a process when the terminal by one embodiment of this invention changes out of service area after ad hoc construction. 4 is a flowchart illustrating processing of a terminal that has received a transmitted ad hoc disconnection request according to an embodiment of the present invention. It is a figure explaining the infrastructure mode which communicates via an access point. It is a figure explaining the ad hoc mode which performs wireless LAN communication between terminals directly. It is a figure which shows the condition where a wireless terminal can communicate with each other. It is a figure which shows the condition where a radio | wireless terminal cannot mutually communicate.

Explanation of symbols

100 terminal 110 CDMA communication unit 120 WLAN communication unit 130 control unit 131 CDMA control unit 132 WLAN control unit 133 SMS communication unit 140 storage unit 141 connection information storage area for ad hoc 142 connection information storage area for own terminal 150 ad hoc connection processing unit 160 input Part 170 Display part AP1 Access point C1 Child (terminal)
CF1 child information area CF2 child ad hoc information area P1 parent (terminal)
PF1 Parent information area PF2 Parent ad hoc information area R1, R2 Room SS SMS server TM1, TM2 Wireless terminal WL Wall

Claims (6)

A first communication unit that performs wide-area wireless communication with another wireless terminal via a wireless base station;
A second communication unit that performs narrow-area wireless communication with another wireless terminal;
A message transmission unit that transmits a message requesting the start of narrow-area wireless communication by the second communication unit to the other wireless terminal via the base station by the first communication unit;
A control unit for controlling to connect to the other wireless terminal using the second communication unit after transmitting a message requesting the start of the narrow-band wireless communication;
A wireless communication terminal. The wireless communication terminal according to claim 1,
A message requesting the start of the narrow area wireless communication is
Including the specific wireless LAN standard that the terminal desires to connect to, channel information in the wireless LAN standard, and the search start time and search interval,
The controller is
Controlling to search for the other wireless terminal using the second communication unit at the search interval from the search start time;
A wireless communication terminal characterized by the above. A first communication unit that performs wide-area wireless communication with another wireless terminal via a wireless base station;
A second communication unit that performs narrow-area wireless communication with another wireless terminal;
A message receiving unit that receives a message requesting the start of narrowband wireless communication from the other wireless terminal by the first communication unit;
A control unit for controlling to connect to the other wireless terminal using the second communication unit based on a message requesting the start of the narrow-area wireless communication received by the message receiving unit;
A wireless communication terminal. The wireless communication terminal according to claim 3, wherein
A message requesting the start of the narrow area wireless communication is
Including the specific wireless LAN standard that the terminal desires to connect to, channel information in the wireless LAN standard, and the search start time and search interval,
The controller is
Controlling to search for the other wireless terminal using the second communication unit at the search interval from the search start time;
A wireless communication terminal characterized by the above. Performing wide-area wireless communication with other wireless terminals via a wireless base station;
Performing narrow-area wireless communication with other wireless terminals;
Transmitting a message requesting the start of narrow area wireless communication to another wireless terminal via the base station by the wide area wireless communication;
After transmitting a message requesting the start of the narrowband wireless communication, controlling to connect to the other wireless terminal using the narrowband wireless communication;
A method of controlling a wireless communication terminal having Performing wide-area wireless communication with other wireless terminals via a wireless base station;
Performing narrow-area wireless communication with other wireless terminals;
Receiving a message requesting the start of narrow-band wireless communication from the other wireless terminal by the first communication unit;
Controlling to connect to the other wireless terminal using the second communication unit based on the message requesting the start of the narrow-area wireless communication received by the message receiving unit;
A method of controlling a wireless communication terminal having

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