JP2008104105A - Radio communication system and mobile terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a radio communication system in which call control delay is reduced and radio efficiency is improved for call control using an SIP. <P>SOLUTION: The present invention relates to a radio communication system which includes a base station (5) and a mobile gateway device (6) and uses an SIP as a call control protocol between a mobile terminal (4) under control of the base station (5) and an SIP device (8). Each of the mobile terminal (4), the base station (5) and the mobile gateway device (6) has a function of transmitting/receiving an SIP message on a radio signaling channel, and the mobile gateway device (6) puts an SIP message received from the SIP device (8) on the radio signaling channel and delivers to the SIP device (8) an SIP message received within the radio signaling channel with the base station (5). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a radio communication system to which a communication standard defined in 3GPP (3rd Generation Partnership Project) or the like is applied, and more particularly to a radio communication system using SIP (Session Initiation Protocol) as a call control protocol. is there.

  There is a method using SIP as one of methods for providing VoIP (Voice over IP) service in the current 3GPP network (network defined in 3GPP). FIG. 12 is a configuration diagram of a radio control network using SIP that provides a VoIP service. This communication network includes a RAN (Radio Access Network) 1 that is a radio access network, a CN (Core Network) 2 that is a core network, an IMS (IP Multimedia Subsystem) 3, and a mobile terminal 4 that can transmit and receive SIP messages. SIP device (SIP Equipment) that implements SIP and transmits / receives SIP messages to / from mobile terminals (UE: User Equipment) 4, base station 5, mobile gateway device 6, router (Router) 7, and SIP 8. The SIP device 8 represents, for example, a SIP server. The RAN 1, CN 2, the base station 5, the mobile gateway device 6 and the router 7 constitute a mobile network 9.

  The following non-patent document 1 exists as one of the standards defined by 3GPP for SIP. FIGS. 13-1 and 13-2 are diagrams showing a sequence example of SIP radio control based on the concept of Non-Patent Document 1 below, and FIG. 13-1 is a sequence when the power of the mobile terminal 4 is turned on. An example is shown, and FIG. 13-2 shows a sequence example during transmission. When providing a VoIP service using SIP in a 3GPP network, first, a GPRS (General Packet Radio Service) control procedure (GPRS protocol), which is a packet network unique to 3GPP, is used. As illustrated in FIG. 13A, when the mobile terminal 4 is powered on, the mobile terminal 4 first registers a location in the mobile gateway device 6, and sets a user channel for transmitting a SIP message by setting a user channel for SIP signaling in GPRS. At this time, the mobile terminal 4 is notified of the IP address of the mobile terminal 4 and the IP address of the SIP device 8 that is the destination of the SIP message. Thereafter, the SIP device 8 in the IMS, which is the request destination, with the mobile terminal 4 performs transmission / reception of the SIP message related to the correspondence registration between the telephone number and the IP address via the mobile gateway device 6. At this time, the SIP message is In the mobile gateway device 6 and the base station 5, the SIP message is transmitted on the user plane. Therefore, the mobile gateway device 6 and the base station 5 are not aware of the SIP message.

  At the time of communication such as a voice call and a video call, as shown in FIG. 13B, a user channel for transmitting a SIP message is first restored using a GPRS service request. After returning, negotiation of the bandwidth and the like is performed between the mobile terminal 4 and the SIP device 8 by call control of the SIP message (SIP call request-response in the figure). Then, based on the result, the mobile terminal 4 uses the GPRS protocol to request the mobile gateway device 6 to set the call user channel, thereby securing a call resource. Thus, the GPRS function is indispensable also when making a call. If the call user channel is set prior to the SIP call request, the call resource securing flow in FIG. 13 is not applied.

3GPP Specification “TS 23.221, V5.11.0”, p.32-33

  As described above, in the current 3GGP network, in order to transmit the SIP message, first, the GPRS protocol independent of the SIP message is executed, and the user channel for SIP message transmission is set between the mobile terminal 4 and the base station 5. It is necessary to set up a user channel for SIP message transmission between the base station 5 and the mobile gateway device 6. Therefore, the resources for managing the radio resources and the radio connections are wasted for the circuit switching mechanism that transmits the call control message through the radio signaling channel. In the LTE (Long Term Evolution) network, which is the next generation 3GPP network, there is no circuit switched network and only a packet network is configured. However, in this case as well, a GPRS control procedure is required to transmit the SIP message. There are similar problems.

  When setting a channel for transmitting user data such as a voice call and a video call, after the mobile terminal 4 interprets the SIP message for call control, the mobile terminal 4 uses the GPRS protocol, and the mobile terminal 4 and the base station 5 Requests setting of a user channel for a call between the body gateway devices 6. For this reason, there has been a problem that the call setup delay time becomes longer as compared with the conventional circuit switching in which the RAN directly interprets the call control message and sets the wireless and wired channels in the RAN.

  In addition, when SIP is used, an area such as an IP header is added to the message, so that the size of the message is larger than that of conventional circuit switching. For this reason, there is a problem that more radio resources are required and the use efficiency of the radio band is deteriorated.

  In addition, when VoIP such as SIP is used, an area such as an IP header is added to user data, so that the data size is larger than that of conventional circuit switching. For this reason, there is a problem that more radio resources are required and the use efficiency of the radio band is deteriorated.

  The present invention has been made in view of the above, and an object of the present invention is to provide a wireless communication system that suppresses an increase in call control delay in call control using SIP.

  Another object of the present invention is to obtain a wireless communication system that suppresses the consumption of wireless resources and improves the usage efficiency of wireless bands.

  In order to solve the above-described problems and achieve the object, a wireless communication system according to the present invention includes a base station and a mobile gateway device, and between a mobile terminal under the base station and a SIP device serving as a communication partner terminal. A wireless communication system using SIP as a call control protocol of the mobile terminal, wherein the mobile terminal, the base station, and the mobile gateway device have a function of transmitting and receiving a SIP message through a wireless signaling channel, and the mobile gateway device The SIP message received from the SIP device is placed on a radio signaling channel, and the SIP message received in the radio signaling channel with the base station is delivered to the SIP device.

  In addition, the wireless communication system is configured by the same device as described above, wherein the mobile terminal and the base station have a function of transmitting and receiving a SIP message through a wireless signaling channel, and the base station targets the SIP message, The base station has a function of exchanging information on the radio signaling channel for the mobile terminal and information on the SIP signaling user channel for the mobile gateway device, and the base station receives the SIP signaling user channel from the mobile gateway device. The SIP message is transferred onto a radio signaling channel, and the SIP message received in the radio signaling channel with the mobile terminal is transferred onto a user channel for SIP signaling with the mobile gateway device.

  In addition, when the mobile gateway device receives a call control SIP message from the mobile terminal via the base station, the mobile gateway device controls the base station based on the call control information included in the SIP message. And the generated radio control message is transmitted to the base station. When the base station receives a radio control message from the mobile gateway device, the base station controls a user channel for communication between the mobile terminal and the base station based on the content of the radio control message.

  In addition, the mobile gateway device and the mobile terminal perform mobility management of the mobile terminal by using a mobility management function of the GPRS protocol.

  Further, the mobile gateway device and the mobile terminal use the mobile IP protocol mobility management function to perform mobility management of the mobile terminal.

  Further, the mobile gateway device or base station notifies the mobile gateway device or base station of header area information such as an IP address used for the SIP message through a radio signaling channel. Remember. The mobile terminal and the mobile gateway device or the base station communicate with each other in a form that excludes a header area with respect to a SIP message, and the mobile terminal and the mobile gateway device or the base station receive a SIP message. A header area is added to the SIP message from the stored header information.

  When the mobile gateway device or base station and the mobile terminal receive the SIP message and the header area is not included in the SIP message, the header information is specified based on the information included in the SIP message. It is added to the SIP message.

  In addition, the mobile gateway device or base station notifies the mobile gateway device or base station of header area information such as an IP address used for user data transmission / reception via a radio signaling channel. In addition to storing information, the mobile terminal and the mobile gateway device or the base station communicate user data with a header area excluded, and the mobile gateway device or the base station and the mobile terminal The header area is added to the user data from the information of the header area stored when the user data is received.

  According to the present invention, since a mobile terminal, a base station, and a mobile gateway device transmit and receive a SIP message using a radio signaling channel that is indispensable for radio control, a user channel for SIP message transmission is provided. This eliminates the need for setting and achieves the effect that wireless resources and wireless connections can be used efficiently.

  Further, the mobile gateway device acquires information necessary for controlling the RAN from the SIP message for performing the call control, and controls the RAN using the acquired information, thereby controlling the RAN according to the GPRS protocol. You can shortcut the procedure. For this reason, there is an effect that it is possible to suppress an increase in call control delay when performing call control using SIP.

  In addition, since the wireless SIP message can be communicated without the header area such as the IP address, the wireless resource can be efficiently used.

  In addition, since call data such as wireless voice and video can be communicated without a header area such as an IP address, wireless resources can be efficiently used.

  Embodiments of a wireless communication system according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
The configuration of the first embodiment of the radio communication system according to the present invention is the same as that of the radio control network (see FIG. 12) which is the above-described conventional radio communication system. FIG. 1 is a diagram showing a configuration example of a protocol stack in each component of the wireless communication system according to the present invention, in order from the left, a protocol stack in the mobile terminal 4, a protocol stack in the base station 5, and a mobile gateway. The protocol stack in the device 6, the protocol stack in the router 7, and the protocol stack in the SIP device 8 are shown. Each element of this protocol stack is defined by 3GPP and Internet standards. RRC (Radio Resource Control) is a standard for performing wireless control between the mobile terminal 4 and the base station 5, and RLC (Radio Link Control) is a standard for performing wireless error control, MAC (Media Access Control). ) Is a standard for performing access control related to information transmission on the radio, RANAP (Radio Access Network Application Protocol) is a standard for the mobile gateway 6 to perform radio control on the base station 5, and SCCP (Signaling Connection Control Part) M3UA (MTP3 User Adaptation Layer) and SCTP (Stream Control Transmission Protocol) are standards for controlling a transmission interface between the mobile gateway 6 and the base station 5. FIG. 1 shows that a SIP message transmitted as user data is converted into a wireless signaling layer in the mobile gateway device 6.

  In the communication system configured as described above, an operation when the mobile terminal 4 transmits a SIP message to the SIP device 8 at the time of power-on and transmission will be described with reference to FIGS. 2-1 and 2-2. . FIG. 2-1 shows a sequence example when the power is turned on, and FIG. 2-2 shows a sequence example when the call is made.

  As shown in FIG. 2A, the mobile terminal 4 first registers its location in the mobile gateway device 6 when the power is turned on. At this time, the mobile terminal 4 is notified of the IP address of the mobile terminal 4 and the IP address of the SIP device 8 that is the destination of the SIP message. Compared with the above-described conventional operation (see FIG. 13-1), it is not necessary to set up a user channel for SIP signaling of GPRS. Thereafter, the mobile terminal 4 and the SIP device 8 in the IMS SIP messages related to the registration of correspondence between telephone numbers and IP addresses are transmitted and received. At this time, a SIP message is transmitted between the mobile terminal 4 and the mobile gateway device 6 on the radio signaling channel. For example, the RRC message transfer function is used between the mobile terminal 4 and the base station 5, and the RANAP message transfer function is used between the base station 5 and the mobile gateway device 6. In the present embodiment, the mobile gateway device 6 that has received the SIP message from the SIP device 8 transfers the SIP message received on the radio signaling channel with the base station 5 and transfers the SIP message on the radio signaling channel. Transfer to the SIP device 8. The mobile gateway device 6 determines whether or not the message received from the SIP device 8 is a SIP message from, for example, the UDP port number that carries the SIP message.

  As shown in FIG. 2B, the operation at the time of communication such as voice call and video call is performed by returning the SIP signaling user channel using the GPRS service request as compared with the above-described conventional operation (see FIG. 13-2). Is no longer necessary. The operations of the base station 5 and the mobile gateway device 6 regarding the subsequent transmission / reception of the SIP message are the same as the operations at the time of power-on described above.

  As described above, in the present embodiment, since the mobile terminal, the base station, and the mobile gateway device retransmit the SIP message by reusing the radio signaling channel that is essential for radio control, the SIP message It is not necessary to set a user channel for use, and efficient use of radio resources and radio connections can be realized.

Embodiment 2. FIG.
The configuration of the wireless communication system of the second embodiment is the same as that of the first embodiment described above. FIG. 3 is a diagram showing a configuration example of a protocol stack in each component of the wireless communication system according to the present invention, in order from the left, the protocol stack in the mobile terminal 4, the protocol stack in the base station 5, and the mobile gateway device. 6 shows a protocol stack in the router 7, a protocol stack in the router 7, and a protocol stack in the SIP device 8. FIG. 3 shows that a SIP message transmitted as user data is converted into a wireless signaling layer in the base station 5.

  In the wireless communication system configured as described above, the operation when the mobile terminal 4 transmits a SIP message to the SIP device 8 at the time of power-on and transmission will be described based on FIG. 4A and FIG. To do.

  As shown in FIG. 4A, the mobile terminal 4 first registers its location in the mobile gateway device 6 when the power is turned on. Thereafter, the user channel for transmitting the SIP message is set by the user channel setting for SIP signaling of GPRS. However, it is not necessary to set up a user channel for SIP signaling between the mobile terminal 4 and the base station 5. At this time, the mobile terminal 4 is notified of the IP address of the mobile terminal 4 and the IP address of the SIP device 8 that is the destination of the SIP message. Thereafter, the mobile terminal 4 and the SIP device 8 in the IMS perform transmission / reception of the SIP message related to the correspondence registration between the telephone number and the IP address via the mobile gateway device 6. At this time, a SIP message is transmitted between the mobile terminal 4 and the base station 5 on the radio signaling channel. For example, the RRC message transfer function is used between the mobile terminal 4 and the base station 5. In the present embodiment, the mobile gateway device 6 that has received the SIP message from the SIP device 8 transfers this to the base station 5 using the user channel for SIP message transmission, and the base station 5 uses this as the radio signaling channel. Transfer with it. The base station 5 transfers the SIP message received from the mobile terminal 4 on the radio signaling channel to the mobile gateway device 6 using the user channel for SIP message transmission, and the mobile gateway device 6 transfers the SIP message to the SIP. Transfer to device 8. The base station 5 determines whether or not the message received from the mobile gateway device 6 is a SIP message from, for example, the user data channel number or the UDP port number to which the SIP message is carried.

  As shown in FIG. 4B, the operation during communication such as voice call and video call does not require the return of the SIP signaling user channel between the mobile terminal 4 and the base station 5. The operations of the base station 5 and the mobile gateway device 6 regarding the subsequent transmission / reception of the SIP message are the same as the operations at the time of power-on described above.

  As described above, in this embodiment, the mobile terminal and the base station reuse the radio signaling channel that is essential for radio control to transmit and receive the SIP message. This eliminates the need for setting and enables efficient use of wireless resources and wireless connections.

Embodiment 3 FIG.
In the third embodiment, the mobile gateway completely terminates the SIP message and shortcuts the GRPS procedure. The configuration of the wireless communication system of this embodiment and the protocol stack to be used are the same as those of the first embodiment. is there. The operation when the mobile terminal 4 transmits a SIP message to the SIP device 8 at the time of outgoing call will be described with reference to FIG. FIG. 5 shows a sequence when the mobile gateway device 6 performs radio control using SIP information. In FIG. 5, it is assumed that the processing up to transmission / reception of “SIP: transmission request message” is completed in the same procedure as in the first embodiment. The mobile terminal 4 generates a “SIP: call request message” addressed to the SIP device 8. The SIP message includes call control information such as information relating to a band necessary for communication with the SIP device 8 and information relating to QoS. This information is defined by, for example, SDP (Session Description Protocol). The mobile terminal 4 transfers the SIP message to the mobile gateway device 6 using the same radio signaling channel as in the first embodiment. Further, the mobile gateway device 6 transfers the SIP message to the SIP device 8 as in the first embodiment. In response to this request, the SIP device 8 forwards a “SIP: outgoing response message” including information on necessary bandwidth and information on QoS in the reverse direction. In general, the bandwidth and QoS used for a call are determined at this point.

  When the mobile gateway device 6 receives “SIP: outgoing response message”, it analyzes the content. As a result of the analysis, the bandwidth and QoS included in the SIP message are acquired. Then, the mobile gateway device 6 generates a “RANAP: radio control request” for securing the radio band of the base station 5 based on the acquired band and QoS information, and transmits it to the base station 5. This request secures radio resources used for the call. In addition, the base station 5 transmits “RRC: radio channel setting request” to the mobile terminal 4 to notify the used resources.

  In the present embodiment, the operation when mobile gateway device 6 performs radio control using SIP information in the communication system of the first embodiment has been described. It is also possible for the mobile gateway device 6 to perform wireless control using SIP information.

  As described above, in the present embodiment, the mobile gateway device directly analyzes the SIP message, and acquires information necessary for controlling the RAN (Radio Access Network) (information related to necessary bandwidth and QoS). Then, the RAN is controlled using the acquired information. As a result, the mobile gateway device does not need to perform the GPRS control procedure, so that an increase in call control delay can be suppressed.

Embodiment 4 FIG.
Next, the radio communication system according to the fourth embodiment will be described. The configuration of the wireless communication system of the present embodiment is the same as that of the first embodiment.

  SIP cannot perform mobility management (MM). That is, in order to perform mobility management in communication control using SIP, it is necessary to use another protocol together. Therefore, in the present embodiment, a method for realizing mobility management in a radio communication system using SIP as a call control protocol will be described.

  FIG. 6 is a diagram illustrating a configuration example of a protocol stack in each component of the wireless communication system according to the fourth embodiment. In order from the left, the protocol stack in the mobile terminal 4, the protocol stack in the base station 5, and the mobile gateway The protocol stack in the device 6, the protocol stack in the router 7, and the protocol stack in the SIP device 8 are shown.

  As shown in FIG. 4, in the wireless communication system according to the present embodiment, the mobile gateway device 6 controls the mobile terminal 4 using the GPRS protocol mobility management (GPRS MM) protocol. Note that the GPRS protocol includes a session management (SM) protocol for performing call control. In the third embodiment, for example, call control is realized by SIP. Does not use the Session Management (GPRS SM) protocol. Further, since the call control operation is the same as that of the first embodiment, the description thereof is omitted.

  In this embodiment, the MM protocol of the GPRS protocol is applied to the wireless communication system of the first embodiment. However, the MM protocol of the GPRS protocol is applied to the wireless communication systems of the second and third embodiments. By applying, mobility management can be realized also in the wireless communication systems of the second and third embodiments.

  Thus, in the present embodiment, mobility management is performed using the MM protocol of the GPRS protocol. Thereby, movement management of a mobile terminal can be performed in a wireless communication system that performs call control by SIP.

Embodiment 5. FIG.
Next, the radio communication system according to the fifth embodiment will be described. The configuration of the wireless communication system of the present embodiment is the same as that of the first embodiment. In the wireless communication system of the fourth embodiment described above, the mobility management is performed using the GPRS protocol. However, in the wireless communication system of the present embodiment, the mobile IP (Mobile IP) protocol is used. Perform mobility management. FIG. 7 is a diagram illustrating a configuration example of a protocol stack in each component of the wireless communication system according to the fifth embodiment. The wireless communication system according to the present embodiment is the same as that of the above-described fourth embodiment except that the mobile IP protocol is used, and thus detailed description thereof is omitted.

  Note that it is also possible to perform mobility management using the mobile IP protocol for the wireless communication systems of the second and third embodiments.

  Thus, in this embodiment, mobility management is performed using the mobile IP protocol instead of the MM protocol of the GPRS protocol. Thereby, similarly to Embodiment 4 described above, the mobility management of the mobile terminal can be performed in the radio communication system that performs call control by SIP.

Embodiment 6 FIG.
Next, the radio communication system according to the sixth embodiment will be described. The configuration of the wireless communication system of the present embodiment is the same as that of the second embodiment. In the present embodiment, a radio communication system that improves the use efficiency of radio bands in the RAN will be described.

  FIG. 8 is a diagram illustrating a configuration example of a protocol stack in each component of the wireless communication system according to the sixth embodiment. In order from the left, the protocol stack in the mobile terminal 4, the protocol stack in the base station 5, and the mobile gateway The protocol stack in the device 6, the protocol stack in the router 7, and the protocol stack in the SIP device 8 are shown. As shown in FIG. 8, the UDP and IP header related to the SIP message are excluded between the mobile terminal 4 and the base station 5.

  In the wireless communication system of the present embodiment, the use efficiency of the wireless band is improved by transmitting and receiving SIP messages excluding the IP and UDP headers. As an example, the operation when the mobile terminal 4 transmits a SIP message to the base station 5 will be described with reference to FIG. First, the mobile terminal 4 acquires its own IP address and the IP address of the SIP device 8 at the timing of setting the user channel for SIP signaling of GPRS, and stores them. In the present embodiment, the mobile terminal 4 transmits an SIP message excluding the IP and UDP headers to the base station 5. In particular, in the case of the first SIP message transmission after the radio signaling connection is set, the mobile terminal 4 transmits its own IP address and the IP address of the SIP device 8 together with the SIP message excluding the header. The base station 5 stores the received IP address list (the IP addresses of the mobile terminal 4 and the SIP device 8), reproduces the IP and UDP headers, adds them to the SIP message, and forwards them to the SIP device 8. To do. Further, when the base station 5 receives the SIP message from the SIP device 8, the SIP message from which the header information is deleted is transmitted to the mobile terminal 4. The mobile terminal 4 reproduces the IP and UDP headers using the stored IP address list. The UDP information is determined in advance by the system, or the mobile terminal 4 and the base station 5 share the information in the same manner as the IP address.

  In the present embodiment, the operation of the IP and UDP headers is performed by the base station 5, but this operation may be performed by the mobile gateway device 6. The mobile terminal 4 obtains its own IP address and the IP address of the SIP device 8 at the timing of setting the user channel for SIP signaling of GPRS, but there is a case where this becomes the timing of location registration. For this reason, the deletion of the IP and UDP headers of the SIP message transmitted and received between the mobile terminal 4 and the base station 5 has been described by taking the case of the wireless communication system of the second embodiment as an example. The present technique can be similarly applied to a wireless communication system.

  Thus, in this embodiment, the IP and UDP headers are deleted from the SIP message transmitted / received between the mobile terminal and the base station. Thereby, the use efficiency of the radio | wireless band in RAN can be improved.

Embodiment 7 FIG.
Next, the radio communication system according to the seventh embodiment will be described. The configuration of the wireless communication system of the present embodiment is the same as that of the sixth embodiment. In the present embodiment, a radio communication system that improves the use efficiency of the radio band in the RAN using a method different from that of the above-described sixth embodiment will be described.

  First, as in the sixth embodiment, the mobile terminal 4 obtains its own IP address and the IP address of the SIP device at the timing of setting the user channel for GPRS SIP signaling, and stores them. In the present embodiment, the mobile terminal 4 transmits an SIP message excluding the IP and UDP headers to the base station 5. Unlike the sixth embodiment, even when the first SIP message is transmitted after the wireless signaling connection is set, the own IP address and the IP address of the SIP device are not transmitted at the same time. In general, the SIP message includes the IP address of the endpoint to be transmitted / received (corresponding to the mobile terminal 4 and the SIP device 8 in this embodiment), and the base station 5 analyzes the content of the received SIP message. And obtain these addresses. The base station 5 stores these IP addresses, reproduces the IP and UDP headers, adds them to the SIP message, and transfers them to the SIP device 8. When the base station 5 receives the SIP message from the SIP device 8, the SIP message from which the header information is deleted is transmitted to the mobile terminal 4. The mobile terminal 4 reproduces the IP and UDP headers using the stored IP address. Note that UDP information is already determined by the system.

  In this embodiment, the operation of the IP and UDP headers is performed at the base station, but this operation may be performed at the mobile gateway device. In addition, the mobile terminal acquires its own IP address and the IP address of the SIP device at the timing of setting the user channel for SIP signaling in GPRS, but there is a case where this becomes the timing of location registration. For this reason, this method can also be applied to all the wireless communication systems of the first to fifth embodiments.

  Thus, in this embodiment, the IP and UDP headers are deleted from the SIP message transmitted / received between the mobile terminal and the base station. Thereby, the use efficiency of the radio | wireless band in RAN can be improved.

Embodiment 8 FIG.
Next, the radio communication system according to the eighth embodiment will be described. The configuration of the wireless communication system of the present embodiment is the same as that of the second embodiment. In the present embodiment, a radio communication system that improves the use efficiency of radio bands in the RAN will be described.

  In the wireless communication system of the present embodiment, the use efficiency of the wireless band is improved by transmitting / receiving the call data IP packet excluding the IP header. As an example, an operation when the mobile terminal 4 transmits using FIG. 10 will be described. In FIG. 10, it is assumed that the processing is completed in the same procedure as in the second embodiment until “SIP: transmission request / response message” is transmitted and received. First, the mobile terminal 4 obtains the IP address of the communication end terminal in the transmission / reception process of “SIP: transmission request / response message” and stores it. Further, this IP address is notified to the base station 5 at the timing of “RRC: radio channel setting response”, for example, and the base station 5 stores this. Further, it is assumed that the mobile terminal 4 and the base station 5 hold the IP address of the mobile terminal 4 by the same method as in the sixth embodiment, for example. In this embodiment, when the base station 5 receives a call data IP packet from a communication end terminal, the base station 5 transmits data with the IP header removed to the mobile terminal 4, and the mobile terminal 4 The IP header is reproduced from the stored information (the IP address of the communication end terminal acquired and stored above). The mobile terminal 4 transmits a call data IP packet excluding the IP header to the base station 5. The base station 5 reproduces the IP header from the stored information, attaches it to the call data IP packet, and transmits it to the communication end terminal.

  In this embodiment, the operation of the IP header is performed by the base station 5, but this operation may be performed by the mobile gateway device 6. For this reason, the deletion of the IP header of the SIP message transmitted and received between the mobile terminal 4 and the base station 5 has been described by taking the case of the wireless communication system of the second embodiment as an example. All wireless communication of the first to seventh embodiments This method can be similarly applied to the system.

  Thus, in this Embodiment, it decided to delete an IP header with respect to the data IP packet transmitted / received between a mobile terminal and a base station. Thereby, the use efficiency of the radio | wireless band in RAN can be improved.

Embodiment 9 FIG.
Next, the radio communication system according to the ninth embodiment will be described. When an operator provides a VoIP service, as shown in FIG. 11, a “case where a single operator provides RAN, CN, and IMS” and a “case where mobile network and IMS operators are different” are assumed.

  In FIG. 11, 10 is a wireless communication network (hereinafter referred to as network 10) when an operator providing RAN and CN provides a VoIP service, and 11 is a wireless communication network (hereinafter referred to as network 10) provided by an operator having no IMS. (Referred to as network 11) and 12 indicate a network provided by the IMS operator (hereinafter referred to as network 12).

  When receiving the provision of the VoIP service in the wireless communication system illustrated in FIG. 11, the mobile terminal 4 selects a wireless communication network that can receive the service provision at a place where the service is to be received, and selects the selected network. Connecting. The network is selected, for example, when the user operates the mobile terminal 4. In general, in the case of the network 10 provided by a single operator, the above-described Embodiments 1 to 8 can be applied, but when a VoIP service is provided by a plurality of operators as in the networks 11 and 12, It is necessary to use the existing protocol stack and execute the existing sequence shown in FIGS. 13A and 13B (SIP messages may be transmitted over PPP in the existing protocol stack). Therefore, the mobile terminal 4 adaptively switches the communication control operation (protocol stack). Specifically, when the network 10 is selected, the “protocol stack for connection to the wireless communication system described in any of the first to eighth embodiments described above” is selected. When a combination of the networks 11 and 12 is selected, an existing one defined by 3GPP is selected.

  Thus, in the present embodiment, the communication control operation is adaptively switched according to the network configuration in which the mobile terminal receives the VoIP service. Thus, in a communication system in which a network that provides a VoIP service using a conventional method and a network that provides a VoIP service using the method according to the present invention (the method described in the first to eighth embodiments) are mixed. The mobile terminal can adaptively select and execute an operation according to the service provision form.

  As described above, the wireless communication system according to the present invention is useful for a communication system that performs call control using SIP.

3 is a diagram illustrating a configuration example of a protocol stack in each component of the wireless communication system according to the first embodiment. FIG. FIG. 3 is a sequence diagram showing an operation of the first embodiment. FIG. 3 is a sequence diagram showing an operation of the first embodiment. 6 is a diagram illustrating a configuration example of a protocol stack in each component of the wireless communication system according to the second embodiment. FIG. FIG. 10 is a sequence diagram illustrating an operation of the second embodiment. FIG. 10 is a sequence diagram illustrating an operation of the second embodiment. FIG. 11 is a sequence diagram illustrating an operation of the third embodiment. FIG. 11 is a diagram illustrating a configuration example of a protocol stack in each component of the wireless communication system according to the fourth embodiment. FIG. 10 is a diagram illustrating a configuration example of a protocol stack in each component of the wireless communication system according to the fifth embodiment. FIG. 20 is a diagram illustrating a configuration example of a protocol stack in each component of the wireless communication system according to the sixth embodiment. FIG. 20 is a sequence diagram showing an operation of the sixth embodiment. FIG. 20 is a sequence diagram showing an operation of the eighth embodiment. It is a figure for demonstrating the communication system which provides a VoIP service with respect to a mobile terminal. It is a figure which shows the structural example of the communication system containing a radio | wireless communications system. It is a sequence diagram which shows the operation | movement of the existing SIP radio | wireless control. It is a sequence diagram which shows the operation | movement of the existing SIP radio | wireless control.

Explanation of symbols

1 RAN (Radio Access Network)
2 CN (Core Network)
3 IMS (IP Multimedia Subsystem)
4 Mobile terminal 5 Base station 6 Mobile gateway device 7 Router
8 SIP equipment
9 Mobile network 10 Wireless operator network providing RAN and CN and IMS 11 Wireless operator network providing RAN and CN 12 Operator network providing IMS

Claims (12)

A wireless communication system including a base station and a mobile gateway device, and using SIP (Session Initiation Protocol) as a call control protocol between a mobile terminal and a communication partner terminal under the base station,
The mobile terminal, the base station, and the mobile gateway device have a function of sending and receiving SIP messages over a radio signaling channel,
The mobile gateway device places an SIP message received from the communication partner terminal on a radio signaling channel, and delivers the SIP message received in the radio signaling channel with the base station to the communication partner terminal. Wireless communication system. A wireless communication system including a base station and a mobile gateway device, and using SIP as a call control protocol between a mobile terminal under a base station and a communication partner terminal,
The mobile terminal and the base station have a function of transmitting and receiving a SIP message through a radio signaling channel,
In addition, the base station has a function of exchanging information on the radio signaling channel for the mobile terminal and information on the user channel for SIP signaling for the mobile gateway device for SIP messages,
The base station transfers a SIP message received from the mobile gateway device via a SIP signaling user channel onto a radio signaling channel, and receives the SIP message received within the radio signaling channel with the mobile terminal from the mobile gateway. A wireless communication system, wherein a transfer is performed on a user channel for SIP signaling with a device. The mobile gateway device is:
When a SIP message for call control is received, a radio control message for controlling the base station is generated based on call control information included in the SIP message, and the generated radio control message is transmitted to the base station And
The base station
3. When a radio control message is received from the mobile gateway device, a user channel for communication between the mobile terminal and the base station is controlled based on the content of the radio control message. The wireless communication system described.   The wireless communication system according to claim 1, 2, or 3, wherein the mobile gateway device and the mobile terminal perform mobility management of the mobile terminal by using a mobility management function of a GPRS protocol.   The mobile gateway device and the mobile terminal perform mobility management of the mobile terminal by using a mobility management function of a mobile IP (Mobile IP) protocol. Wireless communication system. The base station stores “information of a header area such as an IP address used for SIP message transmission / reception” notified in advance from the mobile terminal using a radio signaling channel;
When the mobile terminal and the base station transmit a SIP message, the mobile terminal and the base station transmit the SIP message with its header area excluded,
When receiving the SIP message from which the header area is excluded, the mobile terminal and the base station reproduce the header area of the received SIP message based on the header area information stored in advance. The wireless communication system according to any one of claims 1 to 5. The mobile gateway device stores “information of a header area such as an IP address used for SIP message transmission / reception” notified in advance from the mobile terminal using a radio signaling channel;
When transmitting the SIP message, the mobile terminal and the mobile gateway device transmit in a form that excludes the header area,
When receiving the SIP message from which the header area is excluded, the mobile terminal and the mobile gateway device reproduce the header area of the received SIP message based on the information of the header area stored in advance. The wireless communication system according to any one of claims 1 to 5, wherein:   When the received SIP message does not include a header area, the base station and the mobile terminal specify header information based on information included in the SIP message, and based on the specified header information The radio communication system according to claim 1, wherein the header area is reproduced.   When the mobile gateway device and the mobile terminal do not include a header area in the received SIP message, the mobile gateway device and the mobile terminal specify header information based on information included in the SIP message, and based on the specified header information The wireless communication system according to claim 1, wherein the header area of the SIP message is reproduced. The base station stores “information of a header area such as an IP address used for user data transmission / reception” notified in advance from the mobile terminal using a radio signaling channel;
When transmitting the user data, the mobile terminal and the base station transmit in a form that excludes the header area,
When receiving the user data from which the header area is excluded, the mobile terminal and the base station reproduce the header area of the received user data based on the information of the header area stored in advance. The wireless communication system according to any one of claims 1 to 9. The mobile gateway device stores “information in a header area such as an IP address used for user data transmission / reception” notified in advance from the mobile terminal using a radio signaling channel;
The mobile terminal and the mobile gateway device, when transmitting user data, transmit in a form that excludes the header area,
When receiving the user data from which the header area is excluded, the mobile terminal and the mobile gateway device reproduce the header area of the received user data based on the information of the header area stored in advance. The wireless communication system according to claim 1, wherein the wireless communication system is a wireless communication system. A first protocol stack for connecting to the first wireless communication system which is the wireless communication system according to any one of claims 1 to 11, and a second wireless different from the first wireless communication system A mobile terminal equipped with a second protocol stack for connecting to a communication system,
A mobile terminal characterized by adaptively selecting the first protocol stack or the second protocol stack according to a protocol stack implemented in a wireless communication system to be connected.

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