JP2006352744A - Method for controlling originating by radio telephone system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for controlling originating by radio telephone systems for reliably carrying out a service of a speaking system and for controlling originating by the radio telephone set without causing malfunction etc. at the radio telephone sets. <P>SOLUTION: In the method for controlling originating in the radio telephone system where a radio channel is shared by a plurality of radio telephone sets by a random access system, the number of simultaneous speeches at the radio channel is monitored by a radio access point or its controller. When the number of simultaneous speeches reaches the allowable number of simultaneous speeches set in advance when receiving originating from a radio telephone set, a connection control instruction to the radio telephone set is sent to a high-order call controller to control originating by the radio telephone set by the call controller. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an outgoing call restriction method in a radio telephone system in which a radio channel is shared by a plurality of radio telephones by a random access method.

  As a conventional radiotelephone system, for example, a configuration shown in FIG. 3 is known. This wireless telephone system has a plurality of IEEE802.11b wireless access points (AP) (two AP1 and AP2 in FIG. 3), which are base stations that use wireless channels of different bands. A plurality of wireless telephones (HS) 5 can belong to each of AP1 and AP2.

  AP 1 and AP 2 are connected to a LAN switch (LAN-SW) 6, and a controller 7, which is a control device for managing communication by managing the number of calls in AP 1 and AP 2, is connected to the LAN-SW 6. In addition, a SIP server 8 which is a higher-level call control device for controlling the HS 5 by the SIP protocol is connected.

  In such a radiotelephone system, when the HS 5 makes a call, the outgoing message (INVITE) is received by, for example, the AP 1 to which it belongs, transmitted to the controller 7 via the LAN-SW 6, and sent from the controller 7 to the SIP server 8 via the LAN-SW 6. Transferred. When the SIP server 8 receives the INVITE, the SIP server 8 recognizes the connection destination by referring to the connection destination information (Requested uri) therein, and calls the connection destination. When the connection destination responds, a voice packet is transmitted and received between the connection destination terminal and the HS 5 to enter a call.

  Since these voice packets are transmitted and received between AP1 and HS5, the free time of the wireless channel decreases as the number of simultaneous calls increases. Then, if a call connection is made exceeding the number of simultaneous calls determined from the maximum throughput of the radio channel, there arises a problem that the call quality of the other HS 5 in the call is deteriorated or the call is disconnected.

  For this reason, in such a conventional radio telephone system, connection is restricted when calls exceeding the allowable number of simultaneous calls occur. For example, in FIG. 3, when the number of simultaneous calls of the assigned AP1 has already reached an allowable maximum number of simultaneous calls at the time of receiving a call from the HS5, as shown in FIG. In response to INVITE from the controller 7, the controller 7 returns 486 / BUSY without performing the outgoing call processing, thereby restricting the outgoing call, thereby outputting a busy tone from the HS 5 and prompting the user to press the disconnect key. When the disconnect key is pressed, CANCEL sent from the HS 5 is transmitted to the controller 7 via the AP 1, and 200 OK is returned from the controller 7 to the HS 5 via the AP 1 by receiving CANCEL. To end.

  In the case of an incoming call, as shown in FIG. 5, the incoming call is restricted by returning 486 / BUSY from the controller 7 to the INVITE from the SIP server 8, and then the controller for the CANCEL from the SIP server 8. The incoming call restriction process is terminated by sending a reply of 7 to 200 OK.

  In FIG. 3, the controller 7 connected to the LAN-SW 6 manages the number of simultaneous calls in each of the AP1 and AP2, and controls communication. The function of the controller 7 is similar to that of the AP1 and AP2. In some cases, the controller 7 may be omitted so that each controller is provided.

  However, in the above-described conventional outgoing call restriction method, the controller 7 executes the outgoing call restriction process locally independently of the SIP server 8, so that the SIP server 8 recognizes the current state of the HS 5. I can't.

  For this reason, for example, if there is an incoming call to the HS 5 during the outgoing call restriction process of the HS 5 by the controller 7, the SIP server 8 determines that the HS 5 is empty and executes the connection process. If a busy service such as busy forwarding is set, the service is not executed, and the outgoing call restriction message from the controller 7 and the connection processing message from the SIP server 8 conflict, There is a possibility that HS5 malfunctions.

  Accordingly, an object of the present invention made in view of such circumstances is to make a call in a radio telephone system that can reliably execute a busy service and can regulate the call of a radio telephone without causing malfunction or the like in the radio telephone. To provide a regulatory method.

The invention according to claim 1, which achieves the above object, is a method of restricting calls in a radio telephone system in which a radio channel is shared by a plurality of radio telephones in a random access system.
When the number of simultaneous calls in the wireless channel is monitored by a wireless access point or its control device and the call from the wireless telephone is received, when the number of simultaneous calls reaches a preset allowable simultaneous number of calls, A connection restriction instruction for the radio telephone is sent to a higher-level call control apparatus, and the call control apparatus regulates outgoing calls of the radio telephone.

  According to a second aspect of the present invention, in the outgoing call restriction method in the wireless telephone system according to the first aspect, the connection restriction instruction rewrites the outgoing message from the wireless telephone to a message for restricting outgoing call and sends it out. It is characterized by.

  According to the present invention, when the number of simultaneous calls in the wireless channel reaches the allowable number of simultaneous calls when a call from a wireless telephone is received, a connection restriction instruction is sent to the upper call control device, and this call is sent. Since the control device performs outgoing call restriction processing for the radio telephone, the call control apparatus can recognize the current state of the radio telephone. Therefore, if there is an incoming call to the wireless telephone during the outgoing call restriction process, it is possible to reliably execute a busy system service such as busy transfer and to the wireless telephone. Since a message related to the process is sent and a message related to the incoming call process is not sent, a malfunction due to message contention is not induced.

  Hereinafter, an embodiment of a method for restricting outgoing calls in a wireless telephone system of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a sequence of outgoing call restriction. In the present embodiment, in the radiotelephone system having the configuration shown in FIG. 3, the controller 7 monitors the number of simultaneous calls in each of AP1 and AP2, and when each AP detects a call from the belonging HS5, When the number of simultaneous calls has reached the preset allowable number of simultaneous calls, the controller 7 sends a connection restriction instruction for the HS 5 to the SIP server 8, and the SIP server 8 restricts the transmission of the HS 5. It is what I did.

  That is, as shown in FIG. 1, for example, when AP1 receives INVITE from the belonging HS 5, the INVITE is supplied to the controller 7. When the controller 7 receives the INVITE from the AP 1, the controller 7 confirms the number of simultaneous calls of the AP 1 at that time. If the number of simultaneous calls has already reached the allowable number of simultaneous calls, the controller 5 sends the HS 5 to the SIP server 8. The connection restriction instruction is sent.

  In the present embodiment, as a connection restriction instruction from the controller 7 to the SIP server 8, a value that does not normally use the requested uri of the INVITE from the HS 5, for example, the telephone number portion of the connection destination information consisting of the telephone number @ domain is normally used As the INVITE rewritten to *** (indicated by INVITE revision in FIG. 1), that is, the outgoing message from the HS 5 is rewritten as a message for restricting outgoing and sent.

  When the SIP server 8 receives the INVITE revision from the controller 7, the SIP server 8 recognizes that the requested uri is a value that is not normally used, and sends back 486 / BUSY to the HS 5 via the controller 7 and AP1. This causes the busy sound to be output from the HS 5 and prompts the user to press the disconnect key.

  Thereafter, when the disconnect key is pressed, the CANCEL sent from the HS 5 is transmitted to the SIP server 8 via the AP 1 and the controller 7, and the SIP server 8 receives the CANCEL and sends 200 OK to the controller 7 and the AP 1. Then, it returns to HS5, and the outgoing call restriction process ends.

  FIG. 2 is a flowchart showing the INVITE process of the controller in the radiotelephone system according to the present embodiment.

  As described above, in this embodiment, when INVITE is received from the HS (step S1), the current number of simultaneous calls of the received AP is confirmed (step S2), and whether or not the allowable number of simultaneous calls has been reached. (Step S3), if the allowable number of simultaneous calls has been reached, the value of the requested uri of the INVITE is rewritten to the *** @ domain (step S4), that is, outgoing messages from HS are restricted. Is rewritten, and the rewritten INVITE (INVITE modified in FIG. 1) is sent to the SIP server 8 (step S5), and the INVITE processing is terminated (step S6).

  On the other hand, if the current number of simultaneous calls has not reached the allowable number of simultaneous calls in step S3, the INVITE from HS is sent to the SIP server 8 without rewriting in step S5, and the INVITE process is terminated ( Step S6).

  As described above, in this embodiment, when the controller 7 receives the INVITE from the HS 5 and the number of simultaneous calls in the wireless channel has reached the allowable number of simultaneous calls, the controller 7 connects to the SIP server 8. Since the restriction instruction is transmitted and the SIP server 8 restricts the transmission of the HS 5, the SIP server 8 can recognize the current state of the HS 5. Therefore, when there is an incoming call to the HS 5 during the outgoing call restriction process of the HS 5 by the SIP server 8, it is possible to reliably execute a busy service such as busy transfer and to the HS 5. Since a message related to outgoing call restriction processing is sent and no message related to incoming call processing is sent, HS5 malfunction due to message contention is not caused.

  In addition, as a connection restriction instruction from the controller 7 to the SIP server 8, the connection destination information of the outgoing message from the HS 5 is rewritten to connection destination information that is not normally used, so that it is sent as a message for performing outgoing restriction. The existing radio telephone system can be implemented easily and inexpensively by software changes.

  It should be noted that the present invention is not limited to the above embodiment, and many changes or modifications are possible. For example, the connection restriction instruction from the controller 7 to the SIP server 8 is not limited to the case where the connection destination information of the outgoing message is rewritten to a value that is not normally used and transmitted as a message for performing outgoing restriction as in the above embodiment. It is also possible to add dedicated connection restriction information to the INVITE from the HS 5 and send it to the SIP server 8, and the SIP server 8 can detect the connection restriction information and restrict the transmission of the HS 5. The present invention can also be effectively applied to a radio telephone system in which the controller 7 is omitted by providing each AP with the function of the controller 7.

It is a figure which shows the sequence of the transmission control in the radio | wireless telephone system which concerns on one embodiment of this invention. It is a flowchart explaining the INVITE process in the controller in the radio telephone system of this Embodiment. It is a figure which shows the structure of an example of the radio telephone system which can apply this invention. It is a sequence which shows the conventional transmission restrictions. It is a sequence which shows the conventional incoming call control.

Explanation of symbols

1, 2 Wireless access point (AP)
5 Wireless telephone (HS)
6 LAN switch (LAN-SW)
7 Controller 8 SIP server

Claims (2)

In a method for restricting outgoing calls in a wireless telephone system in which a wireless channel is shared by a plurality of wireless telephones by a random access method
When the number of simultaneous calls in the wireless channel is monitored by a wireless access point or its control device and the call from the wireless telephone is received, when the number of simultaneous calls reaches a preset allowable simultaneous number of calls, An outgoing call restriction method in a wireless telephone system, wherein a connection restriction instruction for the wireless telephone is sent to a higher-level call control apparatus, and outgoing calls of the wireless telephone are restricted by the call control apparatus. 2. The call restriction method in the radio telephone system according to claim 1, wherein the connection restriction instruction rewrites a call message from the radio telephone to a message for call restriction.

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