JP2006074620A - Calling method in telephone system, telephone system, calling unit, base station and mobile station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a network load constituting a telephone system. <P>SOLUTION: A telephone system 1 is a system for use in a limited area such as a premise network. A calling server 100 collects into a single list the calling requests requested in each certain period, and simultaneously performs packet transmission of the calling list to the whole radio base stations 410. When calling completion is notified from a calling terminal 200, the corresponding calling request is deleted from the calling list. A target terminal 300 receives the calling list packet from neighboring radio base stations 410 and 420 in the telephone system 1. The target terminal 300 confirms whether the self-terminal is included in the list concerned, and when the self-terminal is included, the target terminal 300 registers the own location information into the calling server 100, and extracts the information related to the calling terminal 200 from the calling server 100. Then, a calling response is transmitted to the calling terminal 200 of the calling source via the radio base station 410, etc., and communication is started accordingly. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a calling technique in a telephone system, and more particularly to a calling method, a telephone system, a calling device, a base station, and a mobile station in a telephone system used in a limited area such as a private telephone.

  Currently, in the mobile phone system, the location of each mobile phone terminal is registered on the system side. Therefore, when a call is made to a desired mobile phone terminal, a call request is transmitted to the base station to which the terminal belongs. In such a system, since data transmission for location registration of each mobile phone terminal is necessary, there are problems such as an increase in power consumption of the terminal, an increase in traffic volume, and a decrease in channel efficiency. In particular, the increase in power consumption of the terminal decreases the battery duration and decreases the convenience of the mobile phone.

On the other hand, a system that does not require location registration on the system side is also disclosed. For example, Patent Document 1 discloses a system for multicasting transmission packets to a radio base station corresponding to a general call area.
Japanese Patent Laid-Open No. 2003-110498

  However, Patent Document 1 has a heavy load on the network, and a multicast with a high communication cost occurs every time a call is made. In addition, when a large number of multicasts for calling occur, the original call is hindered by the traffic. In particular, the larger the area for multicasting, the greater these problems.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a calling method, a telephone system, a calling device, a base station, and a mobile station in a telephone system that can reduce the load on the network that constitutes the telephone system. It is to provide.

  In order to solve the above-described problem, a calling method in a telephone system according to an aspect of the present invention is a calling method in a telephone system constructed in a predetermined area, and a plurality of call requests are collected together in an area. Send. According to this aspect, the number of simultaneous transmissions can be reduced, and the load on the network can be reduced.

  Another aspect of the present invention is also a calling method in a telephone system. This method is a calling method in a telephone system constructed in a predetermined area, and one or more call requests are transmitted simultaneously in the area at predetermined time intervals. According to this aspect, the number of simultaneous transmissions can be reduced, and the load on the network can be reduced.

  Yet another aspect of the present invention is also a calling method in a telephone system. This method is a calling method in a telephone system constructed in a predetermined area, and one or more calling requests are broadcasted in the area using a communication channel dedicated to calling. According to this aspect, the standby terminal only needs to monitor the call-dedicated channel, and the number of switching of the communication channel can be reduced.

  Yet another aspect of the present invention is a telephone system. This telephone system is a telephone system constructed in a predetermined area, and collects a plurality of call requests and broadcasts them all within the area, receives the broadcast request sent simultaneously, and assigns it to itself. And a base station for transmitting to the designated area. The “base station” may be a radio base station that transmits the received call request with a predetermined radio wave intensity. According to this aspect, the number of simultaneous transmissions can be reduced, and the load on the network can be reduced.

  Yet another aspect of the present invention is also a telephone system. This telephone system is a telephone system constructed in a predetermined area, and is transmitted simultaneously with a calling device that simultaneously transmits one or more call requests to the area using a communication channel dedicated to the call. A base station that receives a call request and transmits the call request to an area allocated to the call request using the communication channel. According to this aspect, the standby terminal only needs to monitor the call-dedicated channel, and the number of switching of the communication channel can be reduced.

  Yet another embodiment of the present invention is a calling device in a telephone system. This device is a call device in a telephone system constructed in a predetermined area, and collectively sends a plurality of call requests to the area. According to this aspect, the number of simultaneous transmissions can be reduced, and the load on the network can be reduced.

  Yet another aspect of the present invention is a base station in a telephone system. This base station is a base station in a telephone system constructed in a predetermined area, receives a list in which a plurality of call requests are collected, and transmits the list to an area allocated to itself. The received list may be transmitted using a communication channel dedicated to calling. According to this aspect, by transmitting the list in which the call requests are collected, it is possible to reduce the load on the network as compared with the case of individually transmitting the list.

  Yet another aspect of the present invention is a mobile station in a telephone system. This mobile station is a mobile station in a telephone system constructed in a predetermined area, and when a list summarizing a plurality of call requests is received and a call request to itself is included in the list, respond. According to this aspect, by receiving a list in which a plurality of call requests are collected, the load on the network can be reduced as compared with the case of receiving individual call requests.

  Yet another aspect of the present invention is also a mobile station in a telephone system. This mobile station is a mobile station in a telephone system constructed in a predetermined area. When the same call request is received from a plurality of base stations, the mobile station selects one call request and relays the call request. Reply via the base station. A call request having a high radio field intensity may be selected. According to this aspect, it is possible to select a high quality channel from among a plurality of communication channels.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a computer program, a recording medium, and the like are also effective as an aspect of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the load of the network which comprises a telephone system can be reduced.

Embodiment 1
In the first embodiment, in a wireless IP (Internet Protocol) telephone system used in a limited area such as a private telephone, a call server 100 that manages calls broadcasts a call list listing target terminals to the area. Is.

  FIG. 1 is a diagram showing a configuration of a telephone system 1 according to Embodiment 1 of the present invention. The telephone system 1 is a system used in a limited area such as a private telephone. Of course, the system is not limited to the premises, and may be a system including the outdoors. For example, the present invention can also be applied to a unit such as one company or school in which a plurality of buildings are built on the site.

  The telephone system 1 includes a plurality of radio base stations 410 and 420. These radio base stations 410 and 420 function as access points for the terminals 200 and 300. Each of the wireless base stations 410 and 420 can directly communicate with a terminal in an area where its own radio wave reaches. The wireless base stations 410 and 420 are connected to a server on the system 1 side such as the calling server 100 by a wired dedicated line. The radio base stations 410 and 420 and the call server 100 communicate with each other through different channels so as not to interfere with each other. For example, a different frequency may be used for each of the radio base stations 410 and 420. Note that the same channel may be used between radio base stations that are far enough to prevent interference.

  The call server 100 manages calls to the target terminal 300 in the system 1. The call server 100 collects the call requests requested from the call terminal 200 in a call list. FIG. 2 is a diagram illustrating a call list according to the first embodiment. The call server 100 collects the requested call requests into one list at regular intervals. Specifically, the call list is generated within one second, for example, every several hundred ms. This time interval can be set in consideration of a reduction in traffic volume by collecting call requests and a delay time viewed from the call terminal 200 by not calling immediately.

  The call list in FIG. 2 lists n call requests together. The call list includes a call request requested within the time interval and a call request that is included in the previous call list but has no response. The target terminal and the calling terminal in the call list are specified by the IP address.

  The call server 100 transmits the call list to all the radio base stations 410 and 420 in the system 1 at the same time. If there is a call completion notification from the call terminal 200, the corresponding call request is deleted from the call list. On the other hand, until the notification is obtained, the calling terminal 200 and the target terminal 300 are continuously listed in the calling list transmitted at regular intervals.

  The calling terminal 200 or the target terminal 300 is a mobile station such as a mobile phone. These terminals can connect to the system 1 from the radio base stations 410 and 420 and can talk to other terminals. The call terminal 200 connects a call request specifying its own IP address and the IP address of the call target terminal 300 to an adjacent radio base station (not shown) and transmits the call request to the call server 100. The call terminal 200 sends a call completion notification to the call server 100 before starting a call.

  The target terminal 300 receives the call list packet from the adjacent radio base station 410. It is confirmed whether or not the user is included in the list. If the user is included in the list, the position information of the user is registered in the call server 100 and information on the call terminal 200 is extracted from the call server 100. Then, a call response is made to the calling terminal 200 via the radio base station 410 and the call is started.

  FIG. 3 is a flowchart for explaining the operation of the telephone system 1 according to the first embodiment. First, the calling terminal 200 registers its own location information with respect to the calling server 100 from an adjacent radio base station (not shown) (S10). If the calling terminal 200 is not a mobile station, this process is not necessary. Further, when the calling terminal 200 moves and the access point is changed before a response is received from the target terminal 300, the changed location information is registered. Next, the calling terminal 200 transmits a calling request for the target terminal 300 to the calling server 100 (S12). Then, it waits for a call response from the target terminal 300 (S14).

  When the call server 100 receives a call request from the call terminal 200, the call server 100 adds information on the target terminal 300 and the call terminal 200 to the call list (S16). Then, it waits for a certain time to elapse (S18). When the predetermined time has elapsed (Y in S18), the generated call list is packet-transmitted to all the radio base stations simultaneously (S20).

  The radio base station 410 is waiting for a call list while performing normal operation. When the call list is received from the call server 100, the call list is packet-transmitted toward its own area with a predetermined radio wave intensity (S22). Thereafter, the next call list is awaited while performing the normal operation in the same manner.

  When receiving the call list from the radio base station 410, the target terminal 300 determines whether or not its own call is included in the call list (S24). If the self-call is included (Y in S24), the self-location information is registered in the call server 100 (S26). Actually, registration is performed via an adjacent radio base station, but the route is omitted for the sake of simplification of the drawing. The same applies to steps S28, S30, and S36.

  The target terminal 300 acquires information related to the calling terminal 200 from the calling server 100 (S28). This information includes the current position information of the calling terminal 200. Thereby, it becomes possible to respond to the radio base station which is the current access point, and the accuracy of the response can be improved.

  The target terminal 300 makes a call response to the calling terminal 200 based on the previously acquired position information (S30). When receiving the call response from the target terminal 300, the call terminal 200 transmits a call completion notification to the call server 100 (S32). When the call server 100 receives the call completion notification from the call terminal 200, the call server 100 deletes the corresponding call request from the call list (S34). This is because the call is successful and it is not necessary to include it in the next call list. When the calling terminal 200 receives a call response from the target terminal 300, a call can be started between the calling terminal 200 and the target terminal 300 (S36).

  As described above, according to the first embodiment, it is possible to reduce communication overhead by transmitting the call requests collectively. If the call requests are transmitted together, the packet length becomes long. However, in the case of wireless communication, it is necessary to leave a space between packets. Therefore, reducing the number of packets is advantageous in suppressing the traffic volume of the entire system. In addition, since the call list is transmitted to all the radio base stations all at once, there is no need for mobile stations such as mobile terminals to perform location registration, and the power consumption of the mobile stations can be reduced.

Embodiment 2
In the second embodiment, in addition to the processing of the first embodiment, a call-dedicated channel is provided, the channel on which the call is made is fixed, and the call channel and the call channel are separated.

  The overall configuration of the telephone system 1 according to the second embodiment of the present invention is the same as that of the first embodiment shown in FIG. Hereinafter, a configuration and operation different from those of the first embodiment will be described. The radio base stations 410 and 420 corresponding to each access point usually transmit and receive call packets on the assigned communication channel. On the other hand, in the second embodiment, when a call packet is transmitted, the call packet is changed to a call-dedicated channel and transmitted. This dedicated call channel may be a channel common to all radio base stations. If the call is made on the common call-dedicated channel, the target terminal 300 does not need to switch channels regardless of the location.

  FIG. 4 is a diagram illustrating a call list according to the second embodiment. The normal use channel is added for each access point to the call list of the first embodiment shown in FIG. For example, when the normal use channel of a certain radio base station 410 is channel CH1, information indicating the channel CH1 is added to the call list to the radio base station 410. When the normal use channel of another radio base station 420 is channel CH2, information indicating the channel CH2 is added to the call list to the radio base station 420. This information is added by the call server 100 or each of the radio base stations 410 and 420.

  The target terminal 300 can immediately recognize which channel it should transmit by using the information indicating the channel added to the call list. When the target terminal 300 is in a place where radio waves from a plurality of radio base stations reach, the call-dedicated channel is fixed, so that a plurality of call lists are received. In this case, the optimum radio base station can be selected and communicated by detecting the radio field intensity from each radio base station and selecting the one with the highest radio field intensity.

  FIG. 5 is a flowchart for explaining the operation of the telephone system 1 according to the second embodiment. First, the calling terminal 200 registers its own location information from the adjacent radio base station (not shown) to the calling server 100 (S40). Next, the calling terminal 200 transmits a calling request for the target terminal 300 to the calling server 100 (S42). Then, it waits for a call response from the target terminal 300 (S44).

  When the call server 100 receives a call request from the call terminal 200, the call server 100 adds information on the target terminal 300 and the call terminal 200 to the call list (S46). Then, it waits for a certain time to elapse (S48). When a certain time has elapsed (Y in S48), the corresponding communication channel information is added to the call list transmitted to each radio base station (S50), and packets are transmitted to all radio base stations all at once (S52). .

  The radio base station 410 is waiting for a call list while performing normal operation. When a packet is received from the call server 100, it is determined whether it is a call packet or a call packet (S54). If the packet is for a call (N in S54), the packet is transmitted on the assigned own channel. If it is a call packet (Y in S54), the transmission channel is changed to a call channel (S56). Then, the call list is transmitted to the own area with a predetermined radio field intensity using the call channel (S58). After the transmission of the call list is completed, the transmission channel is returned to its own channel that is normally used (S60). Thereafter, the next call list is awaited while performing the normal operation in the same manner. The other radio base station 420 performs the same processing.

  The target terminal 300 monitors the call channel and waits for the call list to be transmitted (S62). When the call list is received from the radio base station 410, it is determined whether or not the call list is included in the call list (S64). When the self call is not included (N in S64), the process proceeds to step S62 and waits for the next call list.

  If the self-call is included (Y in S64), it waits for a predetermined time and waits for a call list from another radio base station 420 (S66). When a call list is received from another (Y in S66), a call list from a radio base station having the highest radio wave intensity is selected from call lists received from a plurality of radio base stations (S68).

  When no call list is received from another in step S66 (N in S66), and after selecting the call list in step S68, communication of the target terminal 300 is performed on the channel of the radio base station included in the call list. The channel is changed (S70).

  The target terminal 300 registers its own location information in the call server 100 (S72). And the information regarding the calling terminal 200 is acquired from the calling server 100 (S74). This information includes the current position information of the calling terminal 200.

  The target terminal 300 makes a call response to the calling terminal 200 based on the previously acquired position information (S76). When receiving the call response from the target terminal 300, the call terminal 200 transmits a call completion notification to the call server 100 (S78). When receiving the call completion notification from the call terminal 200, the call server 100 deletes the corresponding call request from the call list (S80). When the calling terminal 200 receives a call response from the target terminal 300, a call can be started between the calling terminal 200 and the target terminal 300 (S82).

  As described above, according to the second embodiment, in addition to the effects of the first embodiment, the standby terminal only needs to receive the call-dedicated channel, and it is necessary to change to the communication channel of the area even if it moves. There is no. In addition, since the terminal can select the optimum radio base station, the most sensitive communication channel can be used. Furthermore, since a terminal that is in a call does not receive a call packet, the call is not blocked by the call packet.

  The present invention has been described based on the embodiments. It is to be understood by those skilled in the art that the embodiments are exemplifications, and that various modifications can be made to combinations of the respective components and processing processes, and such modifications are within the scope of the present invention. Such a modification is shown below.

  In the first and second embodiments, the example in which the wireless terminal is used has been described, but the present system can also be applied to a wired terminal. Also, the present invention can be applied to a form in which a wireless terminal and a wired terminal coexist. Furthermore, although the calling terminal has been described as a terminal in the present system, a call request from outside the system can be processed in the same manner as in the first and second embodiments.

  In the second embodiment, the example in which the call-dedicated channel is used instead of the channel assigned to each radio base station when the call list is transmitted has been described. The use of this call-dedicated channel can also be applied to a configuration in which when the call server receives one call request, it is immediately transmitted to all radio base stations. In this case as well, the waiting terminal only needs to receive the call-dedicated channel, and even if it moves, there is no need to change to the communication channel in that area. The terminal can use the most sensitive communication channel. Furthermore, the call is not blocked by the call packet.

It is a figure which shows the structure of the telephone system which concerns on Embodiment 1 of this invention. It is a figure which shows the call list which concerns on Embodiment 1. FIG. 4 is a flowchart for explaining the operation of the telephone system according to the first embodiment. It is a figure which shows the call list which concerns on Embodiment 2. FIG. 10 is a flowchart for explaining an operation of the telephone system according to the second embodiment.

Explanation of symbols

  100 paging server, 200 paging terminal, 300 target terminal, 410 radio base station, 420 radio base station.

Claims (9)

A calling method in a telephone system constructed in a predetermined area,
A calling method in a telephone system, characterized in that a plurality of calling requests are collectively transmitted in the area. A calling method in a telephone system constructed in a predetermined area,
A calling method in a telephone system, wherein one or more calling requests are transmitted simultaneously in the area at predetermined time intervals. A calling method in a telephone system constructed in a predetermined area,
A calling method in a telephone system, characterized in that one or more calling requests are broadcast in the area using a communication channel dedicated to calling. A telephone system built in a predetermined area,
A paging device for collectively sending a plurality of paging requests into the area;
And a base station that receives the broadcast request transmitted simultaneously and transmits it to an area allocated to the telephone system. A telephone system built in a predetermined area,
A paging device that simultaneously broadcasts one or more paging requests into the area using a paging dedicated communication channel;
And a base station that receives the broadcast request transmitted simultaneously and transmits the call request to an area allocated to the call request using the communication channel. A calling device in a telephone system constructed in a predetermined area,
A calling device in a telephone system, characterized in that a plurality of calling requests are collectively transmitted in the area. A base station in a telephone system constructed in a predetermined area,
A base station in a telephone system, which receives a list in which a plurality of call requests are collected and transmits the list to an area assigned to the list. A mobile station in a telephone system built in a predetermined area,
A mobile station in a telephone system which receives a list in which a plurality of call requests are collected and responds when a call request to itself is included in the list. A mobile station in a telephone system built in a predetermined area,
A mobile station in a telephone system, which receives one call request from a plurality of base stations, selects one call request, and responds via a base station that relays the call request.

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