JP4906594B2 - Wireless communication system - Google Patents

Description

  The present invention relates to a wireless communication system, and more particularly, to a wireless communication system in which start processing of group communication is made efficient.

  In a conventional radio communication system, a line control unit (LCU) and a radio base station unit (BS) are connected by a dedicated line, and the radio base station unit and a radio mobile terminal unit (MS) communicate with each other by radio. Was done. However, such a dedicated line is expensive.

With reference to FIG. 7, a case where a SIP (Session Initiation Protocol) session is applied is shown as a reference example. This reference example is not necessarily a conventional technique.
In this reference example, the configuration of the wireless communication system is such that, for example, the access gateway 102 is not provided in FIG.
In FIG. 7, a base station apparatus is interposed between the group call server and the wireless mobile terminal apparatuses # 2 and # 3, but the description of the base station apparatus is omitted.

  In a group call using the SIP protocol on an IP (Internet Protocol) network, a group call request is made from a wireless mobile terminal device, and then the session control is performed to the group call server using the SIP protocol. Session control is performed for each wireless mobile terminal device that is called into the group call from the server. When a session is established between each wireless mobile terminal device and the SIP server, a group call can be started.

FIG. 7 shows an example of the flow of starting a group call.
(1) When the press switch is turned on by a user (person), the wireless mobile terminal device # 1 wirelessly transmits a group call start request signal to the wireless base station device. This group call start request includes information on the IP addresses of the wireless mobile terminal devices # 2 and # 3 that are the other party of the group call. This IP address information is stored in advance in the memory of the wireless mobile terminal device # 1, for example.
(2) When the radio base station apparatus receives the above-described group call start request, an INVITE signal indicating that the radio mobile terminal apparatus # 1 requests a group call with the radio mobile terminal apparatuses # 2 and # 3 To the group call server.

(3) Upon receiving the above INVITE, the group call server transmits a 100 Trying signal indicating that processing is in progress to the radio base station apparatus.
(4) In addition, the group call server transmits an INVITE signal to the wireless mobile terminal device # 2.
(5) Similarly, the group call server transmits an INVITE signal to the wireless mobile terminal device # 3.
(6) Upon receipt of the above-mentioned INVITE, the wireless mobile terminal device # 2 transmits a 180 Ringing signal indicating that a call is being made to the group call server.
(7) Similarly, when receiving the above-mentioned INVITE, the wireless mobile terminal device # 3 transmits a 180 Ringing signal indicating that it is calling to the group call server.

(8) Radio | wireless mobile terminal apparatus # 2 transmits the signal of 200OK for notifying the IP address and port number of an own apparatus to a group call server.
(9) Upon receiving the 200 OK signal, the group call server transmits an ACK signal to the wireless mobile terminal device # 2.
(10) As a result, an RTP (Real-time Transport Protocol) / RTCP (RTP Control Protocol) connection is established between the group call server and the wireless mobile terminal device # 2.

(11) Similarly, the wireless mobile terminal device # 3 transmits a 200 OK signal for notifying its own IP address and port number to the group call server.
(12) Upon receiving the 200 OK signal, the group call server transmits an ACK signal to the wireless mobile terminal device # 3.
(13) Thereby, an RTP / RTCP connection is established between the group call server and the wireless mobile terminal device # 3.

(14) The group call server transmits a 200 OK signal indicating that the connection with the wireless mobile terminal devices # 2 and # 3 is established to the wireless base station device.
(15) Upon receiving the above-described 200 OK, the radio base station apparatus transmits an ACK signal to the group call server.
(16) Thereby, an RTP / RTCP connection is established between the group call server and the radio base station apparatus.
(17) Then, the radio base station apparatus transmits a group call start response signal to the radio mobile terminal apparatus # 1. As a result, it is possible to send voice from the wireless mobile terminal device # 1 to the wireless mobile terminal devices # 2 and # 3.

JP 2004-336617 A

However, in the processing shown in FIG. 7, the following (Problem 1) and (Problem 2) occur.
(Problem 1) Each time a group call is started, session control must be performed between the wireless mobile terminal device and the SIP server, and the processing efficiency is not good.
(Problem 2) Since it is necessary to perform session control as many as the number of wireless mobile terminal devices, when the number of wireless mobile terminal devices calling into a group call increases, a delay occurs in the start of the group call.

  The present invention has been made in view of such a conventional situation, and an object of the present invention is to provide a wireless communication system in which group communication start processing is made efficient.

In order to achieve the above object, in the present invention, a wireless communication system having one or more wireless base station devices, a plurality of wireless mobile terminal devices, and one or more group communication servers has the following configuration. .
That is, the communication path connection means is a communication path for each of a plurality of IP addresses that are unassigned (that is, not assigned) to the wireless mobile terminal device between the wireless base station device and the group communication server. Connect.

  Therefore, before group communication is performed by the wireless mobile terminal device, it is possible to prepare for group communication by connecting a communication path for an IP address to be allocated to the wireless mobile terminal device in advance. Thereby, when group communication is actually performed, the start of group communication can be realized quickly, and thus the start process of group communication can be made more efficient.

Here, the function of the communication path connection means is provided in, for example, a radio base station apparatus or a group communication server. Further, as one configuration example, an access gateway may be provided. In this case, the function of the communication path connection means is provided in, for example, a radio base station apparatus, an access gateway, or a group communication server.
Various communications such as voice communications (calls) and data communications such as texts and images may be used as communications.

The radio communication system according to the present invention has the following configuration as an example configuration.
That is, in the radio base station apparatus, the terminal detection unit detects the radio mobile terminal apparatus accommodated in the own apparatus (the radio base station apparatus). An assigning means assigns the unassigned IP address to the wireless mobile terminal device detected by the terminal detecting means. The notifying means notifies the group communication server of the identification information of the wireless mobile terminal device detected by the terminal detecting means and the IP address assigned by the assigning means.
In the group communication server, a notification receiving unit receives the notification from the radio base station apparatus. Corresponding storage means stores the correspondence between the identification information of the wireless mobile terminal device and the IP address based on the content of the notification received by the notification receiving means.

  Accordingly, when a wireless mobile terminal device is detected by the wireless base station device, an IP address is assigned to the wireless mobile terminal device, and the correspondence between the identification information of the wireless mobile terminal device and the IP address is registered in the group communication server. Therefore, in the group communication server, the correspondence between the identification information of the wireless mobile terminal device and the IP address can be grasped in advance, whereby the start of the group communication can be realized quickly, and the group communication The start process can be made more efficient.

Here, various types of information may be used as the identification information of the wireless mobile terminal device. For example, information on a telephone number can be used. Note that the identification information of the wireless mobile terminal device is included in a communication signal from the wireless mobile terminal device to the wireless base station device and detected by the wireless base station device, for example.
The correspondence storage means can be configured using a memory, for example.

The radio communication system according to the present invention has the following configuration as an example configuration.
That is, in the wireless mobile terminal device, the terminal start requesting unit wirelessly transmits a group communication start request including identification information of another wireless mobile terminal device with which the group communication is performed to the wireless base station device.
In the radio base station apparatus, a base station start request receiving means receives the group communication start request from the radio mobile terminal apparatus. Based on the content of the group communication start request received by the base station start request receiving means, the base station start requesting means performs identification information of the requesting wireless mobile terminal device and wireless mobile as a partner for group communication A group communication start request including identification information of the terminal device is transmitted to the group communication server.
In the group communication server, a server start request receiving unit receives the group communication start request from the radio base station apparatus. The IP address specifying means determines the IP address and group communication of the requesting wireless mobile terminal device based on the content of the group communication start request received by the server start request receiving means and the content stored in the correspondence storage means. The IP address of the wireless mobile terminal device to be performed is specified. Group communication establishment means establishes group communication using the communication path connected by the communication path connection means using the IP address specified by the IP address specifying means.

  Therefore, when there is a group communication start request from the wireless mobile terminal device, the identification information of the wireless mobile terminal device related to the group communication is notified from the wireless base station device to the group communication server, and the group communication server Since the IP address is specified from the identification information of the mobile terminal device and the group communication is established by the already connected communication path, the start of the group communication can be realized quickly, and the start processing of the group communication is efficient. Can be

  As described above, according to the wireless communication system according to the present invention, a communication path is connected in advance for an unassigned IP address between the wireless base station device and the group communication server, An IP address is assigned to the wireless mobile terminal device detected by the wireless base station device, and the group communication server stores the correspondence between the identification information of the wireless mobile terminal device and the IP address. When there is a request to start communication, the group communication server establishes group communication using the already established communication path using the IP address of the wireless mobile terminal device or the wireless mobile terminal device that is the partner of group communication. Thus, for example, when there is a group communication start request from the wireless mobile terminal device, the group communication start is quickly performed. It can be, can be efficiently start processing of group communication.

Embodiments according to the present invention will be described with reference to the drawings.
FIG. 1 shows a configuration example of an IP network system according to an embodiment of the present invention.
The IP network system of this example includes a group call server (an example of a group communication server) 101, an access gateway 102, a network 103 composed of, for example, Ethernet (registered trademark), a router 104, and a WAN (Wide Area Network), for example. ) Etc., a managed IP network (Managed IP network) 105, a router 106, networks 107 and 108, eg, Ethernet (registered trademark), a plurality of radio base station apparatuses 111 and 112, a plurality of Wireless mobile terminal devices 121 to 124 are included.
FIG. 1 shows radio areas 131 and 132 of the radio base station apparatuses 111 and 112, respectively.

Here, group call server 101, access gateway 102, and router 104 are connected to network 103.
In addition, the router 104 and the router 106 are connected to the managed IP network 105.
The router 106 and the radio base station apparatus 111 are connected via a network 107, and the router 106 and the radio base station apparatus 112 are connected via a network 108.

The group call server 101 includes a SIP / SDP (Session Description Protocol) stack and an RTP / RTCP stack.
The access gateway 102 includes a SIP / SDP stack.
Each of the radio base station apparatuses 111 and 112 includes an RTP / RTCP stack.

In this example, the group call server 101 and the access gateway 102 are connected by Ethernet (registered trademark) using the SIP protocol, and the group call server 101 and the radio base station apparatuses 111 and 112 use the RTP / RTCP protocol. Connected via Ethernet (registered trademark).
Further, in the communication between the radio base station apparatuses 111 and 112 and the radio mobile terminal apparatuses 121 to 124, various radio communication schemes may be used in the radio section. Specific examples include the TDMA (Time Division Multiple Access) method, the FDMA (Frequency Division Multiple Access) method, the SCPC (Single Channel Per Carrier) method, and the PHS (Personal Handy method). be able to.

  FIG. 2 shows an example of an initial operation flow in the IP network system of this example. In FIG. 2, only one radio base station apparatus is shown, but the same processing is performed for each radio base station apparatus 111 and 112. In addition, the routers 104 and 106, the networks 103, 107, and 108 and the managed IP network 105 relay communication, but illustration and description are omitted.

  (1) Each wireless base station device 111, 112 has an IP address and a port number corresponding to the number of wireless mobile terminal devices 121-124 that can be accommodated by each wireless base station device 111, 112 at the time of activation. Set up. This list of IP addresses is not assigned to the wireless mobile terminal devices 121 to 124 at this point, and can be used. In this example, a port number for a group call (an example of group communication) is used as the port number. For example, the same port number is used for all IP addresses.

(2) At the time of activation, the access gateway 102 activates SIP user agents (SIP UAs) by the number of wireless mobile terminal devices 121 to 124 that can be accommodated by the access gateway 102.
Here, the access gateway 102 preliminarily sets IP address data and port number data (port number data corresponding to a list of IP addresses) set in each of the radio base station apparatuses 111 and 112 connected to the IP network. ) Stored in the memory.
The port number is created by, for example, the access gateway 102 and set in each of the radio base station apparatuses 111 and 112.

Each SIP UA of the access gateway 102 starts session control for group call by SIP with respect to the group call server 101.
(3) The first SIP UA transmits an INVITE (invite) signal to the group call server 101.
(4) Upon receiving the above-mentioned INVITE, the group call server 101 transmits a 200 OK (success) signal to the first SIP UA.
(5) When the first SIP UA receives the above-mentioned 200 OK, the first SIP UA transmits an ACK (acknowledge) signal to the group call server 101.
(6) Thereby, an RTP / RTCP connection is established between the radio base station apparatus 111 (or the radio base station apparatus 112) and the group call server 101 for the first IP address in the list of IP addresses. .

  Here, in this example, the group call server 101 and each of the radio base station apparatuses 111 and 112 are connected via RTP / RTCP, but the RTP control is stopped and the RTP packet is placed on the network. By not transmitting (soundless sound is not sent by RTP), unnecessary communication is omitted. Note that such RTP control stop processing is not necessarily performed.

The same processing as the first SIP UA described above is repeatedly performed by all (N in this example) SIP UAs.
Then, the same processing (7), (8), (9), (10) as the above processing (3), (4), (5), (6) is performed by the last (Nth) SIP UA. The group call is ready.
Thus, in this example, the IP address set in each of the radio base station apparatuses 111 and 112 is registered as the RTP IP address of the group call connection destination.

  FIG. 3 shows an example of a registration operation flow in the IP network system of this example. In FIG. 3, only one radio base station apparatus is shown, but the same processing is performed for each radio base station apparatus 111 and 112. In addition, the routers 104 and 106, the networks 103, 107, and 108 and the managed IP network 105 relay communication, but illustration and description are omitted.

(1) In this example, the radio base station apparatuses 111 and 112 and the radio mobile terminal apparatuses 121 to 124 may be connected by various radio communication schemes.
Each of the radio base station apparatuses 111 and 112 is activated when the radio mobile terminal apparatuses 121 to 124 are powered on in the radio areas 131 and 132 of the own apparatus or in the radio areas 131 and 132 of the own apparatus. It is detected that 124 has moved.
(2) Then, each of the radio base station apparatuses 111 and 112 assigns one IP address to the radio mobile terminal apparatuses 121 to 124. As this IP address, a usable IP address is selected from the list of IP addresses.
In this way, each of the radio base station apparatuses 111 and 112 assigns an IP address to each of the radio mobile terminal apparatuses 121 to 124 accommodated therein.

  Here, each of the radio base station apparatuses 111 and 112 stores the telephone number data of each of the radio mobile terminal apparatuses 121 to 124 accommodated by the own apparatus in association with the data of the assigned IP address in the memory. In this example, telephone number data is used as identification information (ID) of each wireless mobile terminal device 121-124, and is notified from each wireless mobile terminal device 121-124 to the wireless base station devices 111, 112. .

(3) The radio base station apparatuses 111 and 112 simultaneously (or may not be) simultaneously with the assignment of the IP address, the data of the telephone number of the radio mobile terminal apparatuses 121 to 124 and the data of the IP address. An RTCP SDES (Source Description) packet including the correspondence information is transmitted to the group call server 101 as a group call registration request.
(4) When the group call server 101 receives the group call registration request, the group call server 101 stores the telephone numbers of the wireless mobile terminal devices 121 to 124 in the location table provided in the group call server 101 based on the received content. The correspondence between the data and the IP address data is registered. The location table is configured in the memory of the group call server 101, for example.

FIG. 4 shows an example of the format of the SDES packet.
FIG. 4 (a) shows a configuration example of the SDES packet, FIG. 4 (b) shows a configuration example of the packet field, FIG. 4 (c) shows a SDES item format, 4 (d) shows a configuration example of the SDES item field.
Here, the SSRC (Synchronization Source) number represents the number of item lists, and the information in FIG. 4C is source information.
For example, in the SDES item shown in FIG. 4C, when only the IP address is transmitted after transmitting only the telephone number, it is understood that these consecutive telephone numbers correspond to the IP addresses.

  FIG. 5 shows an example of a group call start / stop flow in the IP network system of this example. 5 shows only one radio mobile terminal apparatus and one radio base station apparatus, the same processing is performed for each radio mobile terminal apparatus 121 to 124 and each radio base station apparatus 111 and 112. . In addition, the routers 104 and 106, the networks 103, 107, and 108 and the managed IP network 105 relay communication, but illustration and description are omitted. In addition, each of the wireless mobile terminal apparatuses 121 to 124 performs wireless communication with the wireless base station apparatuses 111 and 112 in which the wireless mobile terminal apparatuses 121 to 124 are accommodated.

  In the group call of this example, one wireless mobile terminal device sends the same information (voice information in this example) to m wireless mobile terminal devices that are one or more other devices, that is, one-to-m communication is performed. Communication is performed in the reverse direction. Further, in this example, a press talk system is used in which a call process is started when a user presses a press switch of a wireless mobile terminal device.

(1) When a user presses a press switch in a certain wireless mobile terminal device # 1, processing related to a group call is started. Here, for example, an aspect designated by the user may be used as the destination of the group call, or a group (combination) of a plurality of wireless mobile terminal devices that perform group calls may be set in advance. Good. In this example, it is assumed that the other party of the group call is two wireless mobile terminal devices # 2 and # 3.
When starting a group call, the wireless mobile terminal device # 1 first determines the telephone numbers of one or more (in this example, a plurality) wireless mobile terminal devices # 2 and # 3 to be called into the group call.
(2) Then, the wireless mobile terminal device # 1 transmits a group call start request signal including data of the determined telephone number to the wireless base station devices 111 and 112 (the wireless base station accommodating the wireless mobile terminal device # 1). To the station device).

(3) Upon receipt of the group call start request, the radio base station apparatuses 111 and 112 call the group call (in this example, a plurality of) radio number data and groups of the radio mobile terminal apparatuses # 2 and # 3. An RTCP APP (Application Defined) packet including a call start request message is created.
(4) The radio base station apparatuses 111 and 112 transmit the created RTCP APP packet to the group call server 101 as a group call start request signal.

Here, in this example, the group call server 101 is set with a maximum number (maximum number of group call controls) for controlling group calls, and controls group calls equal to or less than this maximum number. The maximum group call control number is determined, for example, as 10 groups according to the processing load.
When the group call server 101 receives the above-described APP packet, the group call server 101 determines whether or not the maximum group call control number is exceeded when a new group call is controlled based on the number of group calls currently being controlled. When it does not exceed, the processing of (5) to (8) is performed, and when it exceeds, the processing of (9) to (10) is performed.

(5) The group call server 101 recognizes that the wireless mobile terminal device # 1 desires a group call to the wireless mobile terminal devices # 2 and # 3 based on the contents of the APP packet. When the maximum number of group call controls is not exceeded even when a new group call is controlled, the group call server 101 determines the IP address of the connection destination from the specified telephone number (in this example, wireless) based on the contents of the location table. Mobile terminal apparatuses # 2 and # 3), and a group call is established using the searched IP addresses.
(6) Further, the group call server 101 starts RTP control.

In this way, the source IP address of the APP packet (in this example, the IP address of the wireless mobile terminal device # 1) and the searched IP address (in this example, the IP addresses of the wireless mobile terminal devices # 2 and # 3) Address), RTP control is started and a group call session is established.
(7) The group call server 101 transmits an RTCP APP packet including an ACK message to the transmission source IP address as a group call start ACK response signal, and the group call is transmitted to the wireless mobile terminal device # 1. Notify that it has started. This APP packet is first transmitted to the radio base station apparatuses 111 and 112.
(8) Then, this APP packet (group call start ACK response signal) is wirelessly transmitted from the wireless base station devices 111 and 112 to the wireless mobile terminal device # 1.
Thereby, the group call (voice communication in this example) from the wireless mobile terminal device # 1 to the wireless mobile terminal devices # 2 and # 3 is started.

(9) On the other hand, when a new group call is controlled and the maximum number of group call controls is exceeded, the group call server 101 sends an RTCP APP packet including a NACK message to the group IP start NACK for the source IP address. This is transmitted as a response signal to notify the wireless mobile terminal device # 1 that the group call cannot be started. This APP packet is first transmitted to the radio base station apparatuses 111 and 112.
(10) The APP packet (group call start NACK response signal) is wirelessly transmitted from the wireless base station devices 111 and 112 to the wireless mobile terminal device # 1.

Processes (11) to (15) for terminating the group call when the group call is performed by the processes (5) to (8) described above will be described.
(11) In wireless mobile terminal apparatus # 1, for example, when it is determined to stop a group call in response to an operation from a user, a group call stop request signal is wirelessly transmitted to wireless base station apparatuses 111 and 112. .
(12) Upon receiving the group call stop request, the radio base station apparatuses 111 and 112 transmit an RTCP APP packet including the group call stop request message to the group call server 101 as a group call stop request signal. To do.
(13) Upon receiving the group call stop request described above, the group call server 101 stops RTP control for the group call (in this example, a group call related to the wireless mobile terminal devices # 1, # 2, and # 3). To end the group call control.

(14) The group call server 101 transmits an RTCP APP packet including a group call stop response message as a group call stop response signal to the IP address of the transmission source, and transmits the group call stop response signal to the wireless mobile terminal apparatus # 1. Notify that the call has ended. This APP packet is first transmitted to the radio base station apparatuses 111 and 112.
(15) The APP packet (group call stop response signal) is wirelessly transmitted from the wireless base station devices 111 and 112 to the wireless mobile terminal device # 1.

FIG. 6 shows an example of the format of the APP packet.
FIG. 6A shows a configuration example of the APP packet, and FIG. 6B shows a configuration example of the packet field.
For example, when the wireless mobile terminal device # 1 requests a group call to the wireless mobile terminal devices # 2 and # 3, the data of the telephone number of the wireless mobile terminal device # 1 that is the sender is included in the sender identifier. The connection destination data includes the data of the telephone numbers of the wireless mobile terminal devices # 2 and # 3 that are counterparts to which the group call is to be made, and the group call start request (REQ) is used as the message type.

As described above, in the wireless communication system of this example, the group call server 101 provided with the SIP / SDP stack can control a plurality of group calls at the same time. The number of group calls that can be controlled is predetermined and set in the group call server 101, and control is not performed if the number of group calls that can be controlled is exceeded.
When the access gateway 102 having the SIP / SDP stack is activated, it activates SIP UAs corresponding to the number of wireless mobile terminal devices that can be accommodated by the access gateway 102. In addition, each SIP UA starts session control for the group call by SIP with respect to the group call server 101. In the session control for performing the group call, the RTP IP address of the group call connection destination is set to one of the IP addresses set in the radio base station apparatuses 111 and 112.

Further, in this example, the group call server 101 stops the RTP control (a state in which no voice is transmitted) when a session for the group call is established between the group call server 101 and the access gateway 102. To do.
In addition, the radio base station apparatuses 111 and 112 having the RTP / RTCP stack set IP addresses for the number of radio mobile terminals that can be accommodated by the radio base station apparatuses 111 and 112 at the time of activation. Further, the radio base station apparatuses 111 and 112 are used when the radio mobile terminal apparatuses 121 to 124 move into the radio areas 131 and 132 of the radio base station apparatuses 111 and 112, or the radio base station apparatuses 111 and 112, respectively. When the wireless mobile terminal devices 121 to 124 in the wireless areas 131 and 132 are turned on, one of the set IP addresses is assigned.

  The radio base station apparatuses 111 and 112 transmit RTCP SDES packets including the detected telephone numbers of the wireless mobile terminal apparatuses 121 to 124 to the group call server 101 at the same time as the above-described IP address assignment, for example. Upon receiving the SDES packet, the group call server 101 registers a telephone number and an IP address in a location table provided in the group call server 101.

  The wireless base station devices 111 and 112 include the telephone numbers of the wireless mobile terminal devices 121 to 124 that are called into the group call when the wireless mobile terminal devices 121 to 124 start the group call. An RTCP APP packet is transmitted. When the group call server 101 receives the APP packet, when the maximum group call control number is not exceeded, the group call server 101 searches for the IP address of the connection destination from the designated telephone number and is searched for the IP address of the transmission source of the APP packet. RTP control is started with (in this example, a plurality of) IP addresses to establish a group call. Thereafter, the group call server 101 transmits an RTCP APP packet including an ACK message to the transmission source IP address.

On the other hand, when the group call server 101 receives the above-described APP packet (group call start request) from the radio base station apparatuses 111 and 112 and exceeds the maximum number of group call controls, the group call server 101 performs NACK for the source IP address. An RTCP APP packet including a message is transmitted.
The radio base station apparatuses 111 and 112 transmit RTCP APP packets including a group call stop request message when the radio mobile terminal apparatuses 121 to 124 stop the group call. When receiving the APP packet, the group call server 101 stops the RTP control and ends the group call control.

  Therefore, in the wireless communication system of the present example, for example, it is not necessary to perform session control by SIP for each wireless mobile terminal device every time a group call is performed, and a group call is possible only by RTCP. Can be shortened. Thereby, the delay in the group call connection in the conventional IP network can be eliminated, and the group call connection time in the IP network can be shortened.

  Further, in the wireless communication system of this example, the wireless base station apparatuses 111 and 112 and the group call server 101 are connected on the IP network and the group call can be performed using the RTP / RTCP protocol. And a group call can be realized without depending on the wireless communication method between the wireless mobile terminal devices 121 to 124. For this reason, group calls between the wireless mobile terminal devices 121 to 124 using different wireless communication systems can be easily realized.

  Further, in the wireless communication system of this example, when increasing the number of group calls that can be used simultaneously, for example, a group call server 101 is additionally provided (that is, a plurality of group call servers are provided) The operation of the SIP gateway UA of the access gateway 102 (which may be one) can be easily extended by changing the operation to perform session control for a plurality of group call servers.

Here, as the group call server, the access gateway, the radio base station device, the wireless mobile terminal device, the router, the network, etc., various devices may be used, respectively, and various numbers may be used. It may be provided.
Further, in this example, as shown in FIG. 2, the configuration example in which the access gateway 102 for connecting the radio base station apparatuses 111 and 112 and the group call server 101 first is provided, but another configuration example is shown. For example, a configuration in which the function is provided in the radio base station apparatuses 111 and 112 without providing the access gateway 102 may be used. In the configuration in which the access gateway 102 is provided as in this example, for example, the same radio base station apparatus as in the past can be used as it is.
In this example, unidirectional group communication is shown, but bidirectional group communication may be used, for example.
In addition, the wireless communication system as in this example can be applied to various things such as a municipal disaster prevention system.

  In the wireless communication system of this example, as shown in FIG. 2, wireless communication is performed between the wireless base station apparatuses 111 and 112 and the group call server (an example of a group communication server) 101 via the access gateway 102. A communication path connection unit is configured by a function of connecting a communication path for an IP address that is not assigned to the mobile terminal devices 121 to 124 (in this example, connecting a communication path of RTP / RTCP).

Moreover, in the radio base station apparatuses 111 and 112 of this example, as shown in FIG. 3, the terminal detection means is configured by the function of detecting the radio mobile terminal apparatuses 121 to 124 accommodated in the own apparatus. The assigning means is configured by the function of assigning the IP address to the wireless mobile terminal devices 121 to 124, and the correspondence between the identification information (phone number information in this example) of the wireless mobile terminal devices 121 to 124 and the IP address is grouped. A notification means is configured by the function of notifying the call server 101.
Further, in the group call server 101 of this example, as shown in FIG. 3, a notification receiving unit is configured by the function of receiving the notification from the radio base station apparatuses 111 and 112, and based on the content of the received notification. Corresponding storage means is configured by the function of storing the correspondence between the identification information of the wireless mobile terminal devices 121 to 124 and the IP address in the location table.

In addition, in the wireless mobile terminal devices 121 to 124 of this example, as shown in FIG. 5, the terminal has a function of wirelessly transmitting a start request for group communication (group call in this example) to the wireless base station devices 111 and 112. Start request means is configured.
Further, in the radio base station apparatuses 111 and 112 of this example, as shown in FIG. 5, a base station start request receiving means is configured by a function of receiving a group communication start request from the radio mobile terminal apparatuses 121 to 124. The base station start request means is configured by the function of transmitting a group communication start request to the group call server 101.
Further, in the group call server 101 of this example, as shown in FIG. 5, a server start request receiving unit is configured by a function of receiving a group communication start request from the radio base station apparatuses 111 and 112, and the group communication The IP address specifying means is configured by the function of specifying the IP address from the identification information of each of the wireless mobile terminal devices 121 to 124, and the group communication establishing means is configured by the function of establishing group communication using the specified IP address. It is configured.

Here, the configuration of the system and apparatus according to the present invention is not necessarily limited to the configuration described above, and various configurations may be used. The present invention can also be provided as, for example, a method or method for executing the processing according to the present invention, a program for realizing such a method or method, or a recording medium for recording the program. It is also possible to provide various systems and devices.
The application field of the present invention is not necessarily limited to the above-described fields, and the present invention can be applied to various fields.
In addition, as various processes performed in the system and apparatus according to the present invention, for example, the processor executes a control program stored in a ROM (Read Only Memory) in hardware resources including a processor and a memory. A controlled configuration may be used, and for example, each functional unit for executing the processing may be configured as an independent hardware circuit.
The present invention can also be understood as a computer-readable recording medium such as a floppy (registered trademark) disk or a CD (Compact Disc) -ROM storing the control program, and the program (itself). The processing according to the present invention can be performed by inputting the program from the recording medium to the computer and causing the processor to execute the program.

It is a figure which shows the structural example of the IP network system which concerns on one Example of this invention. It is a figure which shows an example of the flow of the initial stage operation in an IP network system. It is a figure which shows an example of the flow of registration operation | movement in an IP network system. It is a figure which shows an example of a format of a SDES packet. It is a figure which shows an example of the flow of the group call start / stop in an IP network system. It is a figure which shows an example of the format of an APP packet. It is a figure which shows an example of the flow of a group call start.

Explanation of symbols

  101 .. Group call server, 102. Access gateway, 103, 107, 108, Network, 104, 106, Router, 105, Managed IP network, 111, 112, Wireless base station apparatus, 121-124・ Wireless mobile terminal devices 131, 132 ・ ・ Wireless area,

Claims (2)

In a wireless communication system having one or more wireless base station devices, a plurality of wireless mobile terminal devices, and one or more group communication servers,
Communication path connection means for connecting a communication path for each of a plurality of IP addresses that are not allocated to the wireless mobile terminal device between the wireless base station device and the group communication server,
The radio base station apparatus includes a terminal detection unit for detecting the radio mobile terminal apparatus accommodated in the own apparatus, and an allocation unit for allocating the unassigned IP address to the radio mobile terminal apparatus detected by the terminal detection unit And notification means for notifying the group communication server of the identification information of the wireless mobile terminal device detected by the terminal detection means and the IP address assigned by the assignment means,
The group communication server includes: a notification receiving unit that receives the notification from the radio base station device; and correspondence between the identification information of the wireless mobile terminal device and an IP address based on the content of the notification received by the notification receiving unit And corresponding storage means for storing
The wireless mobile terminal device includes a terminal start request unit that wirelessly transmits a group communication start request including identification information of another wireless mobile terminal device that is a group communication partner, to the wireless base station device,
Further, the radio base station apparatus includes a base station start request receiving means for receiving the group communication start request from the radio mobile terminal apparatus, and a group communication start request received by the base station start request receiving means. Base station start request means for transmitting to the group communication server a group communication start request including identification information of a requesting wireless mobile terminal device and identification information of a wireless mobile terminal device with which group communication is performed, based on the content; With
The group communication server includes a server start request receiving unit that receives the group communication start request from the radio base station device, contents of the group communication start request received by the server start request receiving unit, and the correspondence memory IP address specifying means for specifying the IP address of the requesting wireless mobile terminal device and the IP address of the wireless mobile terminal device with which the group communication is performed based on the stored contents of the means, and the IP address specifying means Group communication establishment means for establishing group communication by a communication path connected by the communication path connection means using an IP address,
A wireless communication system. The wireless communication system according to claim 1, wherein
The group communication server is configured with a maximum group communication control number that is the maximum number for controlling group communication. When receiving the group communication start request, the group communication server determines whether or not the maximum group control number is exceeded. The group communication establishment means establishes group communication, and if it exceeds, the wireless base station is notified via the wireless base station that group communication cannot be started. Communications system.

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