JP2011077866A - Radio base station device, radio communication system, and radio communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce load of a device on a network above a radio base station device, suppress data loss, and continue communication between terminals when a failure occurs on a network above a radio base station device, in a radio communication system. <P>SOLUTION: A radio base station device 3 includes a reception processor 4, a transmission processor 5, a holding unit 6, a determining unit 7 and a transmission controller 8. The holding unit 6 holds identification information of a terminal that wirelessly communicates with the base station device. The reception processor 4 processes data received from a first terminal 1 as a transmission source. The determining unit 7 determines whether a second terminal 2 as a destination can wirelessly communicate with the base station device, based on the identification information of the second terminal 2 as the destination contained in the output data of the reception processor 4 and the identification information held in the holding unit 6. The transmission controller 8 transmits the output data of the reception processor 4 to the transmission processor 5 when the second terminal 2 can wirelessly communicate with the base station device. The transmission processor 5 processes the output data of the reception processor 4 and transmits the data to the second terminal 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a radio base station apparatus, a radio communication system, and a radio communication method.

  2. Description of the Related Art Conventionally, in a wireless communication system, a method for managing the position of a terminal in a table and updating the position information registered in the table via a network different from the wireless communication network used by the terminal is known. ing. For example, there is known a pager position registration method that automatically performs position registration and frequency switching without being aware of the service area of the destination when the pager moves. In one such pager location registration method, for example, the home station uses the pager location information, the visitor service area location information, and the channel frequency assigned to this location information as the pager individual number. Correspondingly, a location registration management table registered in advance is provided. When the pager moves to the service area of the visitor station, it connects to the ISDN public telephone, automatically calls the home station via the public network, and transfers location registration update information. The home station searches the location registration management table based on the individual number of the pager. When the received location information is registered, the home station updates the location location information in the location registration management table and the corresponding channel frequency used. Returns frequency switching information. The pager automatically switches the channel frequency based on the received frequency switching information (see, for example, Patent Document 1).

JP-A-9-18926

  However, in the conventional technique, when data is transmitted / received between the terminal B and the terminal C that wirelessly communicate with the same base station A, the data transmitted from the terminal B is transmitted to the upper network via the base station A. To the terminal C via the base station A from the upper network side. Therefore, there is a problem that the amount of data processing between the base station A and the upper network increases, and the load on the upper network side device increases due to a delay in processing time. In addition, since all user data is sent from the transmission source to the destination via the host network, there is a risk that the data may be lost in the middle. Further, there is a problem that communication between terminals cannot be continued when a failure occurs on the upper network side.

  It is an object of the present invention to provide a radio base station apparatus, a radio communication system, and a radio communication method that can reduce the load on an apparatus on the upper network side. An object of the present invention is to provide a radio base station apparatus, a radio communication system, and a radio communication method capable of suppressing data loss. An object of the present invention is to provide a radio base station apparatus, a radio communication system, and a radio communication method capable of continuing communication between terminals when a failure occurs on the upper network side.

  The radio base station apparatus includes a reception processing unit, a transmission processing unit, a holding unit, a determination unit, and a transmission control unit. The reception processing unit processes data received from the terminal. The transmission processing unit processes data to be transmitted to the terminal. The holding unit holds identification information of a terminal capable of wireless communication with the own station. Based on the identification information of the destination terminal included in the data processed by the reception processing unit and the identification information held in the holding unit, the determination unit can wirelessly communicate with the local station of the data destination terminal. Judge whether there is. The transmission control unit sends the data processed by the reception processing unit to the transmission processing unit when the determination unit determines that the destination terminal is capable of wireless communication with the own station.

  According to this radio base station apparatus, radio communication system, and radio communication method, it is possible to reduce the load on the apparatus on the network side higher than the radio base station apparatus. Data loss can be suppressed. Communication between terminals can be continued when a failure occurs on the network side higher than the radio base station apparatus.

1 is a block diagram illustrating a radio base station apparatus and a radio communication system according to a first embodiment. 3 is a flowchart illustrating a wireless communication method according to the first embodiment. It is explanatory drawing which shows an example of the header information in IPv4 of the IP protocol concerning Example 2. FIG. FIG. 6 is a block diagram of a radio base station apparatus according to a second embodiment. 7 is a flowchart for explaining an uplink routing process in the wireless communication method according to the second embodiment; 12 is a flowchart for explaining downlink routing processing in the wireless communication method according to the second embodiment; FIG. 10 is a sequence diagram illustrating a first connection example in the wireless communication method according to the second embodiment. FIG. 10 is a sequence diagram illustrating a second connection example in the wireless communication method according to the second embodiment. FIG. 10 is a sequence diagram illustrating a third connection example in the wireless communication method according to the second embodiment. FIG. 10 is a sequence diagram illustrating a fourth connection example in the wireless communication method according to the second embodiment. It is explanatory drawing which shows an example of the LCID value concerning Example 2. FIG. FIG. 10 is a sequence diagram illustrating a fifth connection example in the wireless communication method according to the second embodiment.

  Exemplary embodiments of a radio base station apparatus, a radio communication system, and a radio communication method will be described below in detail with reference to the accompanying drawings.

Example 1
FIG. 1 is a block diagram of a radio base station apparatus and a radio communication system according to the first embodiment. As illustrated in FIG. 1, in the first embodiment, when a transmission source terminal and a destination terminal are communicable with the same wireless base station apparatus, data transmitted from the transmission source terminal is transmitted to the wireless base station. The wireless base station device transfers the packet to the destination terminal without going through the upper network of the station device. In FIG. 1, a first terminal 1 is a terminal that is a data transmission source. The second terminal 2 is a terminal that is a data destination.

  The radio base station apparatus 3 includes a reception processing unit 4, a transmission processing unit 5, a holding unit 6, a determination unit 7, and a transmission control unit 8. The reception processing unit 4 processes data received from the first terminal 1. The transmission processing unit 5 processes data to be transmitted to the second terminal 2. The holding unit 6 holds identification information of a terminal capable of wireless communication with the own station. Based on the identification information of the second terminal 2 included in the data processed by the reception processing unit 4 and the identification information held in the holding unit 6, the determination unit 7 determines that the second terminal 2 is wireless with its own station. It is determined whether or not communication is possible. The transmission control unit 8 sends the data processed by the reception processing unit 4 to the transmission processing unit 5 when the determination unit 7 determines that the second terminal 2 can wirelessly communicate with the own station. In FIG. 1, a solid arrow indicates a data signal flow, and a broken arrow indicates a control signal flow (the same applies to FIG. 4).

FIG. 2 is a flowchart for explaining the wireless communication method according to the first embodiment. As shown in FIG. 2, first, the radio base station apparatus 3 receives data transmitted from the first terminal 1 to the second terminal 2 and performs reception processing by the reception processing unit 4 (step S1). Next, the radio base station apparatus 3 uses the determination unit 7 to identify the second terminal 2 included in the reception-processed data, and the identification of the terminal that is held in the holding unit 6 and is capable of wireless communication with the own station. Based on the information, it is determined whether or not the second terminal 2 is capable of wireless communication with the own station (step S2). That is, the determination unit 7 determines whether or not the identification information of the second terminal 2 is included in the identification information of the terminal that is held in the holding unit 6 and capable of wireless communication with the own station. When the determination unit 7 determines that the second terminal 2 can wirelessly communicate with the own station (step S2: Yes), the radio base station apparatus 3 uses the reception processing unit 4 according to an instruction from the transmission control unit 8. The received data is sent to the transmission processing unit 5. The data transmitted by the transmission processing unit 5 is transferred to the second terminal 2 (step S3). On the other hand, when the determination unit 7 determines that the second terminal 2 cannot wirelessly communicate with the own station (step S2: No), the radio base station apparatus 3 receives a reception processing unit according to an instruction from the transmission control unit 8 The data received and processed by 4 is transferred to the upper network (step S4). Data is sent from the first terminal 1 to the second terminal 2 as described above.

  According to the first embodiment, the radio base station device 3 uses the terminal identification information held in the holding unit 6 to allow the second terminal 2 that is the destination of data received from the first terminal 1 to perform radio communication with the own station. You can know if it is possible. When the second terminal 2 can wirelessly communicate with its own station, the wireless base station device 3 transfers the data received from the first terminal 1 to the second terminal 2 without going through the upper network. The load on the device on the network side can be reduced. In addition, it is possible to suppress data loss that may occur when all data transmitted and received between terminals passes through a higher-level network. Further, even if a failure occurs on the upper network side, communication between terminals can be continued.

(Example 2)
The wireless base station device, the wireless communication system, and the wireless communication method according to the first embodiment operate as an interface device through which the wireless base station device wirelessly communicates with a terminal, and user data from a transmission source terminal It can be applied to a system that transfers data to a destination network and sends it to a destination terminal or server device via the higher-level network. As an example, the present invention can be applied to a system that is being standardized by, for example, 3GPP (3rd Generation Partnership Project, a standardization project for third generation mobile communication systems). In the second embodiment, an example applied to a long term evolution (LTE, long term evolution) / system architecture evolution (SAE, system architecture evolution) system, which is one of the systems being standardized by 3GPP, will be described. In the LTE / SAE standard, a radio communication system includes a radio base station apparatus (eNB: Evolved Node B, Evolved Node B), Mobility Management Entity (MME, mobility management entity), and Serving Gateway (serving gateway, serving GW). And a core network such as a public data network gateway (public data network gateway, PDN GW).

  In the second embodiment, when terminals (UE: User Equipment) in the same cell or sector perform data transmission / reception, the radio base station apparatus transmits user data received from a transmission source terminal. Transfer to the destination terminal without transferring to the core network side. When terminals located in different cells or sectors perform data transmission / reception, user data is transferred from the radio base station apparatus to the core network side. On the core network side, user data is transferred between the radio base station apparatus and the serving gateway, between the serving gateway and the public data network gateway, and between the public data network gateway and a public service network such as the Internet. The

  The radio base station apparatus monitors header information of Internet Protocol (IP, Internet protocol, IP protocol) that is a layer 3 function between the terminal and the radio base station apparatus. The radio base station apparatus performs routing of the IP packet described above by managing the source IP address and the destination IP address included in the header information of the IP protocol. The IP address of the terminal corresponds to terminal identification information.

Description of IP Protocol Header Information FIG. 3 is an explanatory diagram of an example of header information in IPv4 of the IP protocol according to the second embodiment. As shown in FIG. 3, the IP header information 11 has a source IP address field 12, a destination IP address field 13, and a total data length field 14. The radio base station apparatus acquires the source IP address and the destination IP address from the source IP address field 12 and the destination IP address field 13, respectively. The source IP address is the IP address of the terminal that is the source of the IP address. The destination IP address is the IP address of the terminal that is the destination of the IP address. The radio base station apparatus acquires the total data length of the IP packet from the total data length field 14. The radio base station apparatus accumulates the total data length of the acquired IP packet and notifies the core network side, whereby the billing process can be performed on the core network side.

FIG. 4 is a block diagram of the radio base station apparatus according to the second embodiment. As shown in FIG. 4, the radio base station apparatus 21 includes an uplink processing unit 22, an uplink MAC / RLC / PDCP processing unit 23, an IP processing unit 24, a scheduler 25, a downlink MAC / RLC / PDCP processing unit 26, a downlink A processing unit 27 and a control information processing unit 28 are provided. The uplink processing unit 22 includes a data receiving unit 31, a data channel receiving unit 32, and a control channel receiving unit 33. The data receiving unit 31 demodulates the uplink signal received from the terminal. The data channel receiving unit 32 decodes the data channel of the output signal of the data receiving unit 31. The control channel receiving unit 33 decodes the uplink control channel of the output signal from the data receiving unit 31. The control channel receiving unit 33 sends feedback information such as retransmission information to the scheduler 25. The uplink processing unit 22 sends various control signals to the scheduler 25.

  The uplink MAC / RLC / PDCP processing unit 23 includes a MAC (Media Access Control) 41, an RLC (Radio Link Control) processing unit 42, a PDCP (Packet Data Convergence Protocol), and a packet data convergence protocol. ) A processing unit 43 is included. The MAC processing unit 41 performs transport channel processing on user data output from the data channel receiving unit 32. The process performed by the MAC processing unit 41 includes a process of Hybrid Automatic Repeat Request (HARQ, hybrid automatic repeat request). The RLC processing unit 42 performs upper layer data transfer on the output data of the MAC processing unit 41. The PDCP processing unit 43 performs header compression or encryption on the output data of the RLC processing unit 42. The uplink MAC / RLC / PDCP processing unit 23 is controlled by an instruction from the scheduler 25 and returns a response to the scheduler 25. The uplink processing unit 22 and the uplink MAC / RLC / PDCP processing unit 23 operate as a reception processing unit.

  The IP processing unit 24 includes a first buffer 51, an IP address monitoring unit 52, an IP address table 53, and a second buffer 54. The first buffer 51 stores user data output from the PDCP processing unit 43 of the uplink MAC / RLC / PDCP processing unit 23. The first buffer 51 sends stored user data as an IP packet to the downlink MAC / RLC / PDCP processing unit 26 or the core network side according to an instruction from the scheduler 25. The second buffer 54 stores user data IP packets sent from the core network side. The second buffer 54 sends the stored user data IP packet to the downlink MAC / RLC / PDCP processing unit 26 in accordance with an instruction from the scheduler 25. The first buffer 51 and the second buffer 54 may be provided separately or may be a common buffer.

  The IP address monitor unit 52 reads the address in the IP header of the user data output from the PDCP processing unit 43 of the uplink MAC / RLC / PDCP processing unit 23. The IP address monitor unit 52 reads the address in the IP header of the user data sent from the core network side. The IP address monitoring unit 52 may read the address in the IP header from the user data stored in the first buffer 51 or the user data stored in the second buffer 54, respectively. The IP address table 53 holds the IP address read by the IP address monitor unit 52 according to an instruction from the scheduler 25. Therefore, the IP address table 53 holds the IP addresses of terminals that are located in the cell or sector of the radio base station apparatus 21 and can communicate with the radio base station apparatus 21. The IP address table 53 determines whether or not the IP address read by the IP address monitor unit 52 is held by an instruction from the scheduler 25. When the IP address table 53 holds the IP address read by the IP address monitor unit 52, the IP address table 53 determines that the terminal having the IP address is capable of wireless communication with the own station, and sends the determination result to the scheduler 25. return. The IP address table 53 operates as a holding unit. The IP address table 53 operates as a determination unit.

  The downlink MAC / RLC / PDCP processing unit 26 includes a PDCP processing unit 61, an RLC processing unit 62, and a MAC processing unit 63. The downlink MAC / RLC / PDCP processing unit 26 applies the uplink MAC / RLC to the output data of the first buffer 51 or the output data of the second buffer 54 in the order of the PDCP processing unit 61, the RLC processing unit 62, and the MAC processing unit 63. / Reverses the process of the PDCP processing unit 23. The processing performed by the MAC processing unit 63 includes processing of a hybrid automatic repeat request. The downlink MAC / RLC / PDCP processing unit 26 is controlled by an instruction from the scheduler 25 and returns a response to the scheduler 25.

  The downlink processing unit 27 includes a data channel transmission unit 71, a control channel transmission unit 72, and a data transmission unit 73. The data channel transmission unit 71 encodes the data channel of the output signal of the MAC processing unit 63. The control channel transmission unit 72 receives control information such as retransmission information from the scheduler 25 and encodes the downlink control channel. The data transmission unit 73 modulates the output signal of the data channel transmission unit 71 and the output signal of the control channel transmission unit 72, and transmits the modulated signal to the terminal as a radio signal. The downlink processing unit 27 receives various control signals from the scheduler 25. The downlink MAC / RLC / PDCP processing unit 26 and the downlink processing unit 27 operate as a transmission processing unit.

  The control information processing unit 28 notifies the core network of various control data according to instructions from the scheduler 25. As an example of the control data notified to the core network, for example, the amount of packets in which the radio base station apparatus 21 internally processes a reception signal from a transmission source terminal as a transmission signal to a destination terminal can be cited. By notifying the amount of packets from the radio base station apparatus 21 to the core network, for example, in the serving gateway, the charging process can be performed including the packets routed inside the radio base station apparatus 21. The control information processing unit 28 receives control data from the core network, and notifies the scheduler 25 of the received control data. The control information processing unit 28 operates as a notification unit.

  The scheduler 25 controls the radio base station apparatus 21, the IP processing unit 24, and the downlink MAC / RLC / PDCP processing unit 26 based on various control signals received from the uplink processing unit 22, and performs uplink and downlink Perform scheduling. The scheduler 25 performs feedback control, for example, by receiving feedback information such as retransmission information from the uplink processing unit 22 and sending control information such as retransmission information to the downlink processing unit 27. When the destination IP address included in the received signal from the transmission source terminal is held in the IP address table 53, the scheduler 25 sets the destination of user data stored in the first buffer 51 to the downlink MAC / RLC / The PDCP processing unit 26 is assumed. When the destination IP address is not held in the IP address table 53, the scheduler 25 sets the destination of user data stored in the first buffer 51 as the core network. The scheduler 25 notifies the control information processing unit 28 of the amount of packets routed within the radio base station apparatus 21. The scheduler 25 deletes from the IP address table 53 the IP address of the terminal that does not respond to the call from its own station. The scheduler 25 operates as a transmission control unit.

FIG. 5 is a flowchart for explaining uplink routing processing in the wireless communication method according to the second embodiment. As shown in FIG. 5, in the uplink processing, when the radio base station apparatus 21 receives an IP packet from a transmission source terminal (step S11), the uplink processing unit 22 and the uplink MAC / RLC / PDCP processing unit 23 Then, reception processing is performed on the IP packet. The first buffer 51 stores the received IP packet (step S12). Next, the IP address monitor unit 52 reads the IP address (source address) of the source terminal and the IP address (destination address) of the destination terminal included in the header information of the IP packet (step S13). The IP address table 53 refers to the held IP address and collates with the IP address of the source terminal and the IP address of the destination terminal read by the IP address monitor unit 52 (step S14). The IP address table 53 determines whether the IP address of the destination terminal has already been registered in the IP address table 53 (step S15). When the IP address of the destination terminal is registered in the IP address table 53 (step S15: Yes), the scheduler 25 determines that the communication is between terminals located in the cell or sector of the local station, and the uplink Routing processing is performed so as to send the IP packet to the downlink (step S16). Next, the downlink MAC / RLC / PDCP processing unit 26 and the downlink processing unit 27 perform transmission processing on the IP packet routed to the downlink (step S17). The transmitted IP packet is transmitted to the destination terminal.

  On the other hand, when the IP address of the destination terminal is not registered in the IP address table 53 (step S15: No), the scheduler 25 determines that the communication is not between terminals located in its own cell or sector. Then, the scheduler 25 performs a routing process so that the uplink IP packet is directly sent to the core network as uplink data (step S18). The IP packet routed to the core network is transmitted to the core network. If the IP address of the transmission source terminal is registered in the IP address table 53 (step S19: Yes), the IP address table 53 assumes that the IP address of the transmission source terminal is known, and sets the IP address. Do not write. On the other hand, when the IP address of the transmission source terminal is not registered in the IP address table 53 (step S19: No), the IP address table 53 assumes that the IP address of the transmission source terminal is new and sets the IP address. A writing process is performed (step S20).

FIG. 6 is a flowchart for explaining downlink routing processing in the wireless communication method according to the second embodiment. As shown in FIG. 6, in the downlink processing, when the radio base station apparatus 21 receives an IP packet from the core network (step S31), the second buffer 54 stores the IP packet (step S32). Next, the downlink MAC / RLC / PDCP processing unit 26 and the downlink processing unit 27 perform transmission processing on the IP packet (step S33). The transmitted IP packet is transmitted to the destination terminal.

  In addition, the IP address monitor unit 52 reads the IP address of the destination terminal included in the header information of the IP packet (step S34). The IP address table 53 refers to the held IP address and collates with the IP address of the destination terminal read by the IP address monitor unit 52 (step S35). The IP address table 53 determines whether or not the IP address of the destination terminal has been registered in the IP address table 53 (step S36). When the IP address of the destination terminal is registered in the IP address table 53 (step S36: Yes), the IP address table 53 performs a process of writing the IP address on the assumption that the IP address of the destination terminal is known. Absent. On the other hand, if the IP address of the destination terminal is not registered in the IP address table 53 (step S36: No), the IP address table 53 assumes that the IP address of the destination terminal is new and writes the IP address. Is performed (step S37).

Description of First Connection Example in Wireless Communication Method FIG. 7 is a sequence diagram illustrating a first connection example in the wireless communication method according to the second embodiment. As shown in FIG. 7, the first connection example is an example when the IP address table 53 of the radio base station apparatus 21 does not register the IP address of the transmission source terminal and the IP address of the destination terminal. First, the first terminal (UE # 1) serving as a transmission source and the second terminal (UE # 2) serving as a destination perform a cell search (step S41). After the cell search is completed, although not shown in the figure, the first terminal transmits to the radio base station apparatus (eNB) 21 detected by the cell search, for example, by random access and RRC (Radio Resource Control, radio resource control) signaling. Connecting. Then, a default bearer is established between the first terminal and the core network side, and an IP address is assigned to the first terminal (step S42).

  For example, the radio base station apparatus 21 and the MME are connected by SCTP (Stream Control Transmission Protocol, stream control transmission protocol) or S1-AP (S1-interface Application, S1 interface application). The MME and the serving gateway are connected by GTP-C (GPRS Tunneling Protocol Control, GPRS Tunneling Protocol Control) and AP (Application Protocol, Application Protocol). When authentication of a terminal is newly required, for example, an HSS (Home Subscriber Server) may be accessed.

  After the establishment of the default bearer, when user data destined for the second terminal is transmitted from the first terminal, the radio base station apparatus 21 receives the user data and stores the received user data in the first buffer 51. Store (step S43). Then, the radio base station apparatus 21 uses the IP address monitor unit 52 to monitor the IP address of the transmission source terminal and the IP address of the destination terminal included in the user data (step S44). Next, the radio base station apparatus 21 refers to the IP address table 53 according to an instruction from the scheduler 25, and confirms whether or not the IP address of the source terminal and the IP address of the destination terminal have been registered (step S45). ). Here, it is assumed that neither the IP address of the first terminal nor the IP address of the second terminal is registered in the IP address table 53. Accordingly, the radio base station apparatus 21 transmits user data destined for the second terminal to the serving gateway, for example (step S46). Further, the radio base station apparatus 21 registers the IP address of the transmission source terminal as information of the first terminal in the IP address table 53 according to an instruction from the scheduler 25 (step S47).

  Although not shown in the figure, for example, when the serving gateway receives user data from the radio base station apparatus 21, the serving gateway tries to connect to the second terminal via the MME and the radio base station apparatus 21. The radio base station apparatus 21 is connected to the second terminal by, for example, RRC signaling. When a new terminal authentication is required, for example, an HSS may be accessed. Then, a default bearer is established between the second terminal and the core network side, and an IP address is assigned to the second terminal (step S48). After the default bearer is established, for example, when user data destined for the second terminal is transmitted from the serving gateway, the radio base station apparatus 21 receives the user data and stores it in the second buffer 54 (step S49). . Then, the radio base station apparatus 21 transmits user data to the second terminal according to an instruction from the scheduler 25 (step S50).

  In addition, the radio base station apparatus 21 monitors the IP address of the destination terminal included in the user data by the IP address monitor unit 52 (step S51). Next, the radio base station apparatus 21 refers to the IP address table 53 according to an instruction from the scheduler 25, and checks whether or not the IP address of the destination terminal has been registered (step S52). Since the IP address of the second terminal is not registered in the IP address table 53, the radio base station apparatus 21 registers the IP address of the destination terminal as information on the second terminal in the IP address table 53 according to an instruction from the scheduler 25. (Step S53).

  Subsequently, when the radio base station apparatus 21 receives user data addressed to the second terminal from the first terminal (step S54), in the same manner as in steps S44 and S45, the IP address of the source terminal and the destination terminal The IP address of the transmission source terminal is monitored (step S55), and it is confirmed whether the IP address of the transmission source terminal and the IP address of the destination terminal are registered (step S56). Since the IP address of the second terminal is already registered in the IP address table 53, the radio base station apparatus 21 transmits the user data received from the first terminal to the second terminal without transmitting to the core network side. (Step S57).

  Further, the radio base station apparatus 21 notifies the serving gateway, for example, of the amount of IP packets transmitted to the second terminal without transmitting to the core network side by the control information processing unit 28 (step S58). Accordingly, for example, the serving gateway transmits the amount of IP packets transmitted from the first terminal to the second terminal via the core network, and is transmitted to the second terminal by the radio base station apparatus 21 without passing through the core network. By adding the amount of IP packets, the information related to the charging process of the subscriber database can be updated. For example, the serving gateway can perform billing processing based on information related to billing processing in the subscriber database.

Description of Second Connection Example in Wireless Communication Method FIG. 8 is a sequence diagram illustrating a second connection example in the wireless communication method according to the second embodiment. As shown in FIG. 8, the second connection example is an example in which the IP address table 53 of the radio base station apparatus 21 has already registered the IP address of the source terminal and the IP address of the destination terminal. . Similarly to the first connection example, after the cell search of the first terminal and the second terminal is completed (step S61), the default bearer is connected between the first terminal and the core network side by, for example, random access and RRC signaling. Is established and an IP address is assigned to the first terminal (step S62). For the second terminal, for example, a default bearer is established between the second terminal and the core network side by RRC signaling, and an IP address is assigned to the second terminal (step S63).

  Thereafter, upon receiving user data addressed to the second terminal from the first terminal (step S64), the radio base station apparatus 21 monitors the IP address of the source terminal and the IP address of the destination terminal (step S65). It is checked by referring to the IP address table 53 whether the IP address of the transmission source terminal and the IP address of the destination terminal have been registered (step S66). Since the IP address of the second terminal has already been registered in the IP address table 53, the radio base station apparatus 21 connects to the second terminal by, for example, RRC signaling, and transmits user data received from the first terminal to the core network side. Without transmitting to the second terminal (step S67). Similarly to the first connection example, the radio base station apparatus 21 notifies the serving gateway of the amount of IP packets transmitted to the second terminal without transmitting to the core network side (step S68). For example, the serving gateway can perform billing processing in the same manner as in the first connection example.

FIG. 9 is a sequence diagram illustrating a third connection example in the wireless communication method according to the second embodiment. As shown in FIG. 9, the third connection example is an example in the case where there is no response from the destination terminal. As an example, similarly to the second connection example, a case will be described in which the IP address of the source terminal and the IP address of the destination terminal are already registered in the IP address table 53 of the radio base station apparatus 21. The process from the cell search of the first terminal and the second terminal to the reference to the IP address table 53 is the same as Step S61 to Step S66 in the second connection example (Step S71 to Step S76). Since the IP address of the second terminal has already been registered in the IP address table 53, the radio base station apparatus 21 transmits, for example, RRC signaling to the second terminal (step S77). When there is no response to the RRC signaling from the radio base station apparatus 21 from the second terminal, the radio base station apparatus 21 transmits user data destined for the second terminal to the serving gateway, for example (step S78).

  If there is no response from the second terminal to the RRC signaling, the radio base station apparatus 21 may transmit the RRC signaling again to the second terminal (step S79). When transmitting RRC signaling again, the radio base station apparatus 21 may transmit user data to, for example, a serving gateway when there is no response to the first RRC signaling transmission (step S78). Alternatively, the radio base station apparatus 21 may transmit user data to, for example, a serving gateway when the number of RRC signaling transmissions reaches a preset number (step S80). When performing a re-transmission of RRC signaling, the communication carrier can set a timing for transmitting user data to, for example, a serving gateway. When there is no response to the RRC signaling from the second terminal, the radio base station apparatus 21 deletes the IP address of the destination terminal from the IP address table 53 according to an instruction from the scheduler 25, and updates the IP address table 53 (step S81). ).

  In addition, after the radio base station apparatus 21 transmits user data to, for example, a serving gateway when there is no response from the second terminal to the first RRC signaling, the second terminal responds to the retransmission of RRC signaling to the second terminal. May respond. In this case, the radio base station apparatus 21 transmits user data to the second terminal in response to a response from the second terminal. Therefore, there is a possibility that the user data via the core network and the user data transmitted from the radio base station apparatus 21 to the second terminal arrive at the second terminal in an overlapping manner. As a countermeasure against this, the user data returned from the core network and the user data transmitted from the radio base station apparatus 21 to the second terminal may be set to be discarded. Alternatively, the radio base station apparatus 21 monitors the protocol (see FIG. 3) included in the header information of the IP packet, and determines whether or not packet duplication is permitted based on the type of the upper protocol. Also good. The radio base station apparatus 21 transmits user data to, for example, the serving gateway when packet duplication is allowed, and does not transmit user data to the serving gateway until the set (re) transmission number is reached, for example, when not allowed. You may do it.

Description of Fourth Connection Example in Wireless Communication Method FIG. 10 is a sequence diagram illustrating a fourth connection example in the wireless communication method according to the second embodiment. As illustrated in FIG. 10, the fourth connection example is an example in the case of transferring user data between radio base station apparatuses. The process from the cell search of the first terminal and the second terminal to the reference to the IP address table 53 is the same as Step S61 to Step S66 in the second connection example (Step S91 to Step S96). However, the first terminal connects to the radio base station apparatus (eNB # 1) detected by the cell search, for example, by random access and RRC signaling, and a default bearer is established between the first terminal and the core network side (step S92). The second terminal connects to the radio base station apparatus (eNB # 2) detected by the cell search, for example, by RRC signaling, and a default bearer is established between the second terminal and the core network side (step S93). The radio base station apparatus (eNB # 2) exists around the radio base station apparatus (eNB # 1). Here, it is assumed that the radio base station apparatus (eNB # 1) receives user data from the first terminal in step S94. Therefore, step S95 and step S96 are implemented in the radio base station apparatus (eNB # 1). The radio base station apparatus (eNB # 1) and the surrounding radio base station apparatus (eNB # 2) are assumed to have the same configuration.

  The radio base station apparatus (eNB # 1) exchanges the IP address table 53 with the neighboring radio base station apparatus (eNB # 2) (step S97). The timing for exchanging the IP address table 53 is not limited to when the radio base station apparatus (eNB # 1) receives user data from the terminal. For example, the IP address table 53 may be exchanged periodically, or an IP address is newly registered in the IP address table 53 of any one of the radio base station devices, or the IP address is deleted from the IP address table 53 For example, the IP address table 53 may be updated.

  Here, the IP address of the second terminal is not in the IP address table 53 of the radio base station apparatus (eNB # 1) that has received the user data, but in the IP address table 53 of the neighboring radio base station apparatus (eNB # 2). Suppose that it is registered. Therefore, the radio base station apparatus (eNB # 1) transfers the user data received from the first terminal to the neighboring radio base station apparatus (eNB # 2) (step S98). When exchanging the IP address table 53 between radio base station apparatuses or transferring user data between radio base station apparatuses, for example, the X2 interface of the interface between radio base station apparatuses (eNBs) may be used. it can.

  When the neighboring radio base station apparatus (eNB # 2) receives the user data addressed to the second terminal from the radio base station apparatus (eNB # 1), it monitors the IP address of the source terminal and the IP address of the destination terminal. Then (step S99), referring to the IP address table 53, it is confirmed whether or not the IP address of the transmission source terminal and the IP address of the destination terminal have been registered (step S100). Since the IP address of the second terminal is already registered in the IP address table 53 of the radio base station apparatus (eNB # 2), the radio base station apparatus (eNB # 2) is connected to the second terminal by RRC signaling, for example. The user data received from the radio base station apparatus (eNB # 1) is transmitted to the second terminal without being transmitted to the core network side (step S101).

  Also, the radio base station apparatus (eNB # 2) notifies the serving gateway, for example, of the amount of IP packets transmitted to the second terminal without transmitting to the core network side as in the first connection example (step S102). For example, the serving gateway can perform billing processing in the same manner as in the first connection example. Note that the range in which user data is transferred between radio base station apparatuses is not limited to adjacent radio base station apparatuses, but the first radio base station apparatus and the second radio adjacent to the first radio base station apparatus. It may be continuously spread between the base station apparatuses and between the second radio base station apparatus and the third radio base station apparatus adjacent to the second radio base station apparatus.

Description of the fifth connection example in the wireless communication method In the first to fourth connection examples described above, the RRC protocol that is a layer 3 function between the terminal and the wireless base station apparatus, the terminal and the wireless base By linking with the MAC protocol, which is a layer 2 function with the station device, the process of monitoring the IP address and the process of referring to the IP address table may be omitted. The fifth connection example is an example in the case of linking with an LCID (Logical Channel ID, logical channel ID) of a MAC header that is a logical channel identifier in the MAC protocol, for example.

  FIG. 11 is an explanatory diagram of an example of the LCID value according to the second embodiment. As shown in FIG. 11, there is an identity of the logical channel 81 as one of LCID values. For example, the index 82 of this identity of the logical channel is associated with the IP address of the destination terminal. The index 82 of the identity of the logical channel corresponds to the identification information of the logical channel.

  FIG. 12 is a sequence diagram illustrating a fifth connection example in the wireless communication method according to the second embodiment. As an example, similarly to the second connection example, a case will be described in which the IP address of the source terminal and the IP address of the destination terminal are already registered in the IP address table 53 of the radio base station apparatus 21. As shown in FIG. 12, the cell search from the first terminal and the second terminal to the reference to the IP address table 53 are the same as steps S61 to S66 in the second connection example (steps S111 to S116). . The radio base station apparatus 21 starts monitoring the LCID of, for example, UL-SCH (Uplink Shared Channel, uplink shared channel) (step S117). Also, the radio base station apparatus 21 transmits the user data received from the first terminal to the second terminal without transmitting to the core network side (step S118).

  Thereafter, when the radio base station apparatus 21 receives user data from the first terminal (step S119), if the LCID is the same as the value monitored when receiving the previous user data, the process of monitoring the IP address and the IP Processing to refer to the address table 53 is omitted. And the radio base station apparatus 21 transmits the user data received from the 1st terminal to the 2nd terminal, without transmitting to the core network side (step S120). Similarly to the first connection example, the radio base station apparatus notifies the serving gateway of the amount of IP packets transmitted to the second terminal without transmitting to the core network side (step S121). For example, the serving gateway can perform billing processing in the same manner as in the first connection example.

  According to the second embodiment, the radio base station apparatus 21 can wirelessly communicate with a terminal serving as a destination of data received from a transmission source terminal based on the IP address of the terminal held in the IP address table 53. You can know if there is. When the destination terminal is capable of wireless communication with the own station, the data received by the wireless base station device 21 from the source terminal is transferred to the destination terminal without going through the core network. Can be reduced. In addition, it is possible to suppress data loss that may occur when all data transmitted and received between terminals passes through the core network. Even if a failure occurs on the core network side, communication between terminals can be continued. In addition, the wireless base station device 21 notifies the core network of the amount of IP packets transmitted to the second terminal without transmitting to the core network side, so that charging processing can be performed, for example, at the serving gateway. Further, when there is no response from the destination terminal to the radio base station apparatus 21, the IP address table 53 can be updated at any time by deleting the IP address of the destination terminal having no response from the IP address table 53. . Moreover, the load on the core network side can be reduced by transferring user data between radio base station apparatuses. Further, for example, the load on the radio base station apparatus 21 can be reduced by omitting the process of monitoring the IP address and the process of referring to the IP address table in conjunction with the RRC protocol or the MAC protocol. For example, in a system including a monitoring camera and a monitor that displays video captured by the monitoring camera as an example, the second embodiment is applied when the monitoring camera and the monitor can wirelessly communicate with the same wireless base station device. can do.

  The following additional notes are disclosed with respect to the first and second embodiments.

(Supplementary Note 1) A reception processing unit that processes data received from a terminal, a transmission processing unit that processes data to be transmitted to the terminal, a holding unit that holds identification information of a terminal that can wirelessly communicate with the own station, and the reception Whether the destination terminal of the data is capable of wireless communication with the own station based on the identification information of the destination terminal included in the data processed by the processing unit and the identification information held in the holding unit And a transmission control unit that sends data processed by the reception processing unit to the transmission processing unit when the determination unit determines that the destination terminal is capable of wireless communication with the local station. And a radio base station apparatus.

(Additional remark 2) It is provided with the notification part which notifies the quantity of the data sent to the said transmission processing part from the said reception processing part by the said transmission control part to the high-order network to which an own station connects. The radio base station apparatus described in 1.

(Supplementary Note 3) When there is no response from the destination terminal to the information transmitted from the local station to the destination terminal, the transmission control unit transmits the data processed by the reception processing unit The wireless base station apparatus according to appendix 1 or 2, wherein the wireless base station apparatus transfers to a higher-level network to be connected and deletes the identification information of the destination terminal from the holding unit.

(Supplementary Note 4) When there is no response from the destination terminal to the information transmitted from the local station to the destination terminal, the transmission control unit transmits the information to the destination terminal again. 4. The radio base station apparatus according to appendix 3, wherein a timing at which the data processed by the reception processing unit is transferred to an upper network to which the own station is connected is controlled.

(Additional remark 5) The identification information currently hold | maintained at the said holding | maintenance part is exchanged between other base stations, The said determination part and the identification information of the destination terminal contained in the data processed by the said reception process part, Whether or not the destination terminal of the data can wirelessly communicate with the own station or the other base station based on the identification information held in the holding unit and the identification information acquired from the other base station. The transmission control unit determines that the destination terminal can wirelessly communicate with the other base station by the determination unit, and transmits the data processed by the reception processing unit to the other base station. The radio base station apparatus according to appendix 1, wherein the radio base station apparatus transfers to a station.

(Supplementary Note 6) By linking with a logical channel identifier between the terminal and the radio base station apparatus, the holding unit omits a process of holding identification information of a terminal capable of wireless communication with the own station, The wireless base station apparatus according to supplementary note 1, wherein the determination unit omits a process of determining whether or not the terminal of the data destination is capable of wireless communication with the own station.

(Supplementary Note 7) The destination terminal identification information and the logical channel identification information included in the data processed by the reception processing unit are related in advance, and the determination unit is configured to process the data processed by the reception processing unit. After determining that the destination terminal of the data is capable of wireless communication with the own station based on the identification information of the destination terminal included in the information and the identification information held in the holding unit, transmission of the data If the identification information of the logical channel used for the transmission and the identification information of the logical channel used for transmission of the newly received data are the same, the identification information of the destination terminal included in the newly received data The process of determining whether the destination terminal of the newly received data is wirelessly communicable with the own station based on the identification information held in the holding unit is omitted. In Appendix 1 Placing the radio base station apparatus.

(Appendix 8) A first terminal that is a data transmission source, a second terminal that is a destination of data transmitted from the first terminal, a reception processing unit that processes data received from the terminal, and data that is transmitted to the terminal A transmission processing unit that processes the identification information of a terminal that can wirelessly communicate with its own station, a destination terminal identification information included in the data processed by the reception processing unit, and the holding unit A determination unit that determines whether or not the destination terminal of the data can wirelessly communicate with the own station based on the identification information, and the determination unit enables the terminal of the destination to wirelessly communicate with the own station. A radio base station apparatus including a transmission control unit that transmits data processed by the reception processing unit to the transmission processing unit, the reception processing unit received from the first terminal Data is processed, and the determination unit receives the reception processing unit. Based on the identification information of the second terminal included in the processed data and the identification information held in the holding unit, it is determined whether or not the second terminal is capable of wireless communication with the own station. When the determination unit determines that the second terminal is capable of wireless communication with the own station, the transmission control unit transmits the data to the transmission processing unit.

(Supplementary note 9) The radio base station apparatus includes a notification unit for notifying the amount of data transmitted from the reception processing unit to the transmission processing unit by the transmission control unit to an upper network to which the station is connected. The notification unit notifies the higher-level network of the amount of data transmitted from the reception processing unit to the transmission processing unit, and the higher-level network transmits the data notified from the radio base station device. The wireless communication system according to appendix 8, wherein billing processing is performed based on the amount.

(Supplementary Note 10) The radio base station apparatus associates in advance identification information of a destination terminal and logical channel identification information included in the data processed by the reception processing unit, and the determination unit Based on the identification information of the second terminal included in the data processed by the processing unit and the identification information held in the holding unit, it is determined that the second terminal can wirelessly communicate with the own station. Thereafter, when the identification information of the logical channel used for transmitting the data is the same as the identification information of the logical channel used for transmitting the newly received data, the destination included in the newly received data The process of determining whether or not the destination terminal of the newly received data is capable of wireless communication with the own station based on the identification information of the terminal and the identification information held in the holding unit is omitted. Special to do The wireless communication system according to Supplementary Note 8,.

(Supplementary Note 11) The step of receiving data transmitted from the first terminal to the second terminal by the radio base station apparatus, the identification information of the second terminal included in the data, the radio base station apparatus and the radio Determining whether the second terminal is capable of wireless communication with the radio base station apparatus based on identification information of a communicable terminal; and the second terminal is in radio communication with the radio base station apparatus And a step of transferring the data from the radio base station apparatus to the second terminal when it is determined to be possible.

DESCRIPTION OF SYMBOLS 1, 2 Terminal 3, 21 Wireless base station apparatus 4, 22, 23 Reception processing part 5, 26, 27 Transmission processing part 6, 53 Holding part 7, 53 Judgment part 8, 25 Transmission control part

Claims (8)

A reception processing unit for processing data received from the terminal;
A transmission processing unit for processing data to be transmitted to the terminal;
A holding unit for holding identification information of a terminal capable of wireless communication with the own station;
Based on the identification information of the destination terminal included in the data processed by the reception processing unit and the identification information held in the holding unit, the destination terminal of the data can wirelessly communicate with the own station. A determination unit for determining whether or not,
A transmission control unit that sends data processed by the reception processing unit to the transmission processing unit when the determination unit determines that the destination terminal is capable of wireless communication with the own station;
A radio base station apparatus comprising:   2. The notification unit according to claim 1, further comprising: a notification unit configured to notify an upper network to which the local station is connected of the amount of data transmitted from the reception processing unit to the transmission processing unit by the transmission control unit. Wireless base station device.   The transmission control unit, when there is no response from the destination terminal to the information transmitted from the own station to the destination terminal, the data processed by the reception processing unit The wireless base station apparatus according to claim 1 or 2, wherein the wireless base station apparatus transfers to a network and deletes the identification information of the destination terminal from the holding unit.   When there is no response from the destination terminal to the information transmitted from the local station to the destination terminal, the transmission control unit transmits the information to the destination terminal again and performs the reception process. The radio base station apparatus according to claim 3, wherein a timing at which the data processed by the unit is transferred to an upper network to which the own station is connected is controlled. Exchange the identification information held in the holding unit with other base stations,
The determination unit, based on the identification information of the destination terminal included in the data processed by the reception processing unit, the identification information held in the holding unit and the identification information acquired from another base station, Determining whether the terminal of the data destination is capable of wireless communication with the own station or the other base station;
When the determination unit determines that the destination terminal is capable of wireless communication with the other base station, the transmission control unit transfers the data processed by the reception processing unit to the other base station. The radio base station apparatus according to claim 1.   By linking with a logical channel identifier between the terminal and the radio base station apparatus, the holding unit omits a process of holding identification information of a terminal that can wirelessly communicate with the own station, and the determining unit 2. The radio base station apparatus according to claim 1, wherein a process of determining whether or not the data destination terminal can perform radio communication with the own station is omitted. A first terminal as a data transmission source;
A second terminal that is a destination of data transmitted from the first terminal;
A reception processing unit for processing data received from the terminal, a transmission processing unit for processing data to be transmitted to the terminal, a holding unit for holding identification information of a terminal capable of wireless communication with the own station, and data processed by the reception processing unit A determination unit that determines whether the destination terminal of the data is capable of wireless communication with the own station based on the identification information of the destination terminal included in the information and the identification information held in the holding unit; A radio base station apparatus comprising: a transmission control unit configured to transmit data processed by the reception processing unit to the transmission processing unit when the determination unit determines that the destination terminal is capable of wireless communication with the own station; ,
Including
The reception processing unit processes data received from the first terminal,
Based on the identification information of the second terminal included in the data processed by the reception processing unit and the identification information held in the holding unit, the determination unit determines that the second terminal is wireless with the local station. Determine whether communication is possible,
The wireless communication system, wherein the transmission control unit sends the data to the transmission processing unit when the determination unit determines that the second terminal is capable of wireless communication with the own station. Receiving at the radio base station device data transmitted from the first terminal to the second terminal;
Whether the second terminal can wirelessly communicate with the radio base station apparatus based on the identification information of the second terminal included in the data and the identification information of the terminal capable of wireless communication with the radio base station apparatus Determining whether or not,
A step of transferring the data from the radio base station apparatus to the second terminal when it is determined that the second terminal is capable of radio communication with the radio base station apparatus;
A wireless communication method comprising:

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