JP2014057215A - Radio communication system, mobile station device, base station devices, control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication system which surely reestablishes connection between a mobile station device and a base station device.SOLUTION: A first communication unit of a mobile station device transmits connection reestablishment request including identification information of a first base station device to a second base station device. A second communication unit of the second base station device acquires mobile station device information concerning the mobile station device on the basis of the identification information of the first base station device included in the connection reestablishment request. A connection unit of the second base station device establishes connection with the mobile station device on the basis of the mobile station device information acquired by the second communication unit.

Description

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

  Conventionally, 3G (3rd generation mobile communication system) radio access network (UTRAN: Universal Terrestrial Radio Access Network), LTE (Long Term Evolution) radio access network (E-UTRAN: Evolved UTRAN) can be accommodated. Mobile communication systems are known.

  At 3GPP (3rd Generation Partnership Project), specifications of LTE-A (LTA, Long Term Evolution-Advanced) are currently being studied.

  The technology described in Patent Document 1 is based on the path of the data signal for voice communication between the first mobile station and the second mobile station from the path via the first radio access network that does not support circuit-switched communication. A mobile communication method for switching to a route through a second radio access network that supports circuit-switched communication. The predetermined server for the second radio access network transmits a path switching signal and starts a timer. Based on the path switching signal, the second mobile station switches the transmission destination of the voice communication data signal addressed to the first mobile station from the gateway device connected to the first radio access network to the predetermined server. If the predetermined server does not detect completion of the handover from the first radio access network to the second radio access network of the first mobile station before the timer expires, the predetermined server transmits a path restoration instruction signal. The second mobile station switches the transmission destination of the voice communication data signal addressed to the first mobile station from the predetermined server to the gateway device in response to the path restoration instruction signal.

  In the technique described in Non-Patent Document 1, when handover between base station apparatuses fails, the mobile station apparatus selects the best cell and transmits a radio resource control connection reconfiguration request. The mobile station apparatus receives a message indicating completion of reconfiguration of radio resource control connection or failure of reconfiguration of radio resource control connection.

JP 2012-033983 A

3GPP TS 36.331 3GPP RAN2 # 75bis R2-1115732

  However, the technique described in Patent Document 1 has a drawback in that failure to reestablish connection in handover cannot be avoided. In the technique described in Non-Patent Document 1, a mobile station apparatus (UE: User Equipment) moves when a connection is reset due to a radio link failure or a handover failure. There is a case in which a cell that does not have station apparatus information (UE context: UE Context) may be selected, and connection reconfiguration fails.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a radio communication system, a mobile station apparatus, a base station apparatus, a control method, and a program that can be reliably re-established.

  (1) The present invention has been made to solve the above problems, and one aspect of the present invention provides a mobile station apparatus, a first base station apparatus that is a connection source of the mobile station apparatus, A wireless communication system comprising a second base station device that is a candidate for a connection destination of a mobile station device, wherein the mobile station device sends a connection reconfiguration request including identification information about the first base station device, A first communication unit configured to transmit to a second base station device, wherein the second base station device is based on identification information related to the first base station device included in the connection reset request; And a connection unit that establishes a connection with the mobile station device based on the mobile station device information acquired by the second communication unit.

  (2) Further, according to one aspect of the present invention, in the wireless communication system according to (1), the second communication unit is connected to the first base station apparatus indicated by the identification information included in the connection reconfiguration request. A third communication unit that transmits a transfer request for the mobile station apparatus information, and the first base station apparatus transmits the mobile station apparatus information to the second base station apparatus based on the transfer request. It is characterized by providing.

  (3) Further, according to one aspect of the present invention, in the wireless communication system according to (1) or (2), the identification information regarding the base station device is identification information indicating a cell of the base station device. Features.

  (4) In addition, according to one aspect of the present invention, in the wireless communication system according to any one of (1), (2), and (3), the mobile station apparatus information is the first base station apparatus. And control information of a mobile station apparatus held by a radio access network including the second base station apparatus.

  (5) According to another aspect of the present invention, in the wireless communication system according to (1), the wireless communication system includes a gateway device that communicates with the first base station device, and the second communication unit Transmits a transfer request for the mobile station apparatus information to the gateway apparatus based on the identification information regarding the first base station apparatus included in the connection resetting request, and the gateway apparatus responds to the transfer request. Based on this, the mobile station apparatus information is provided with the 3rd communication part which transmits the said 2nd base station apparatus to the said 2nd base station apparatus.

  (6) According to another aspect of the present invention, in the mobile station apparatus, a connection reconfiguration request including identification information related to the first base station apparatus that is the connection source is sent to the second base station apparatus that is the connection destination candidate. The communication part which transmits to is provided.

  (7) Further, according to one aspect of the present invention, in the base station apparatus, the identification information is included in the connection resetting request, and is based on the identification information regarding the other base station apparatus that is the connection source of the mobile station apparatus. A communication unit that acquires mobile station device information related to the mobile station device, and a connection unit that establishes a connection with the mobile station device based on the mobile station device information acquired by the communication unit. .

  (8) According to another aspect of the present invention, there is provided a control method in a mobile station apparatus, wherein a connection reconfiguration request including identification information related to a first base station apparatus that is a connection source is a connection destination candidate. It has the communication process transmitted to 2 base station apparatuses, It is characterized by the above-mentioned.

  (9) According to another aspect of the present invention, there is provided a control method in a base station apparatus, which is identification information included in a connection reconfiguration request and identification relating to another base station apparatus that is a connection source of the mobile station apparatus. A communication process for acquiring mobile station apparatus information related to the mobile station apparatus based on the information, and a connection process for establishing a connection with the mobile station apparatus based on the mobile station apparatus information acquired in the communication process. It is characterized by that.

  (10) Further, according to one aspect of the present invention, in the program, a connection reset request including identification information related to the first base station apparatus that is the connection source is sent to the computer as the second base station that is the connection destination candidate. A communication means for transmitting to the apparatus is executed.

  (11) Further, according to one aspect of the present invention, in the program, the computer includes identification information included in the connection reset request, which is based on identification information related to another base station apparatus that is a connection source of the mobile station apparatus. And a communication means for acquiring mobile station apparatus information related to the mobile station apparatus and a connection means for establishing a connection with the mobile station apparatus based on the mobile station apparatus information acquired in the communication process.

  According to the present invention, the connection can be reliably reset.

It is a conceptual diagram which shows an example of a structure of the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is a conceptual diagram which shows an example of a structure of the LTE network which concerns on this embodiment. It is a conceptual diagram which shows an example of a structure of the communication range (cell) in the LTE network which concerns on this embodiment. It is a schematic block diagram which shows an example of a structure of the mobile station apparatus which concerns on this embodiment. It is a schematic block diagram which shows an example of a structure of the base station apparatus which concerns on this embodiment. It is a schematic block diagram which shows an example of a structure of the base station apparatus which concerns on this embodiment. It is a schematic block diagram which shows an example of a structure of the base station apparatus which concerns on this embodiment. It is the schematic which shows an example of the allocation method of the identification information regarding the base station apparatus which concerns on this embodiment. It is a schematic sequence diagram which shows an example of the connection reset process in the mobile station apparatus and base station apparatus which concern on this embodiment. It is a sequence diagram which shows the comparative example of the connection reset process which concerns on this embodiment. It is a sequence diagram which shows an example of the connection reset process which concerns on this embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a conceptual diagram showing an example of a configuration of a wireless communication system S1 according to the first embodiment of the present invention.
In the wireless communication system S1, the 3G network N1 and the LTE network N2 are connected via a core network 200 in a wired or wireless manner. The wireless communication system S1 is a system called HetNet (Heterogeneous Network) in which networks of different communication methods are mixed. The 3G network N1 includes a radio network control device 300 and base station devices 400-1 and 400-2. On the other hand, the LTE network N2 includes base station apparatuses 500-1, 500-2, 500-3, and a base station apparatus 600.

  Base station apparatuses (eNB: Evolved Node B) 500-1, 500-2, 500-3 and base station apparatus (HeNB: Home Evolved Node B) 600 in LTE network N2 each have a function of radio network control apparatus 300. . Hereinafter, base station apparatuses 500-1, 500-2, and 500-3 may be collectively referred to as base station apparatus 500. Moreover, the base station apparatus 500 is a macrocell base station apparatus, for example. Base station apparatus 600 is, for example, a picocell base station apparatus or a home base station apparatus.

FIG. 2 is a conceptual diagram showing an example of the configuration of the LTE network N2 according to the present embodiment.
The LTE network N2 includes core networks 200-1 and 200-2 and base station apparatuses 500-1, 500-2, and 500-3. The core networks 200-1 and 200-2 are, for example, MME (Mobility Management Entity) devices or S-GW (Serving Gateway) devices, and accommodate the base station device 500.

  Base station apparatuses 500-1, 500-2, and 500-3 have communication ranges (cells) CE1, CE2, and CE3, respectively. The base station devices 500-1, 500-2, and 500-3 and the core networks 200-1 and 200-2 are connected by S1 links (S1 interfaces), respectively. The base station device 500-1, the base station device 500-2, and the base station device 500-3 are connected by an X2 link (X2 interface). A base station apparatus 500-1, a base station apparatus 500-2, a base station apparatus 500-3, each cell CE1, CE2, CE3 and each X2 link are included, and E-UTRAN (Evolved Universal Terrestrial Radio) Called Access Network).

FIG. 3 is a conceptual diagram illustrating an example of a configuration of a communication range (cell) in the LTE network N2 according to the present embodiment.
The base station device 500-1 has a communication range (cell) CE1 and performs communication with mobile station devices belonging to the cell CE1. Base station apparatus 500-2 has communication range (cell) CE2, and communicates with a mobile station apparatus belonging to cell CE2. The base station device 500-3 has a communication range (cell) CE3 and performs communication with mobile station devices belonging to the cell CE3.

  In the present embodiment, the cells CE1, CE2, and CE3 are cells that do not overlap each other, but may be cells in which part of the cells overlap. In the following description, it is assumed that the mobile station device 100 moves from the position P1 in the cell CE1 to the position P2 in the cell CE2, and further moves from the position P2 in the cell CE2 to the position P3 in the cell CE3. Also, the cell CE1 of the base station device 500-1 is called a source cell, the cell CE2 of the base station device 500-2 is called a target cell, and the cell CE3 of the base station device 500-3 is called. It shall be called a reconnection cell (Re-establishment Cell).

FIG. 4 is a schematic block diagram illustrating an example of the configuration of the mobile station apparatus 100 according to the present embodiment.
The mobile station apparatus 100 includes a transmission / reception antenna 101, a communication unit 102, a measurement unit 103, a notification generation unit 104, a notification processing unit 105, and a detection unit 106.
In addition, the mobile station apparatus 100 has other generally known functions of the mobile station apparatus, but illustration and description thereof are omitted.

  The communication unit 102 performs up-conversion / down-conversion, modulation / demodulation, encoding / decoding, mapping / demapping, and the like, and transmits / receives data. The communication unit 102 outputs communication environment information to the measurement unit 103. The communication unit 102 receives a radio resource control reconfiguration (RRC Connection Reconfiguration) message that is a handover command (Handover Command). The communication unit 102 outputs the received radio resource control reset message to the notification processing unit 105.

  When the communication environment information is input, the measurement unit 103 performs measurement related to communication quality such as received power and propagation path characteristics in the downlink. The measurement unit 103 outputs the measurement result to the notification generation unit 104. The notification generation unit 104 generates a measurement result report (Measurement Report) message based on the measurement result input from the measurement unit 103. The notification generation unit 104 notifies the generated measurement result report to the base station device 500-1 (cell CE1) via the communication unit 102.

The notification processing unit 105 outputs a handover instruction to the notification generation unit 104 based on a radio resource control reconfiguration (RRC Connection Reconfiguration) message input from the communication unit 102. The notification generation unit 104 outputs a target cell detection request to the detection unit 106 based on the handover instruction input from the notification processing unit 105.
The detection unit 106 detects a target cell based on the target cell detection request input from the notification generation unit 104. The detection unit 106 reports the detection result to the notification generation unit 104.

  When the detection success is notified from the detection unit 106, the notification generation unit 104 generates a random access preamble (Random Access Preamble) message for the target cell. The notification generation unit 104 notifies the generated random access preamble message to the base station device 500-2 (cell CE2) that is the target cell via the communication unit 102.

  The communication unit 102 monitors the response to the random access preamble from the base station device 500-2 (cell CE2) and reports the result (ACK / NACK / no response) to the notification generation unit 104.

  When the notification generation unit 104 is notified of the target cell detection failure from the detection unit 106 or receives a NACK / no response report from the communication unit 102, the notification generation unit 104 determines that the handover has failed, and the detection unit 106 Request detection of (Best Cell). The detection unit 106 determines a reconnection cell, for example, the base station device 500-3 (CE3), based on the detected best cell. The detection unit 106 outputs information regarding the detected best cell (reconnection cell), for example, the base station device 500-3 (cell CE3), to the notification generation unit 104.

  When the information related to the best cell is input from the detection unit 106, the notification generation unit 104 is based on the information on the base station device related to the best cell stored in the notification generation unit 104, for example, the ID of the base station device, the cell ID, and the like. Then, a radio resource control connection reconfiguration request (RRC Connection Re-establishment Request) message for the base station apparatus is generated.

  Here, in the radio resource control connection reconfiguration request message, a global cell identifier (GCI: Global Cell Identity) (identification information on the base station device) of the base station device 500-1 (CE1) that is the source cell (Source Cell). Is included. GCI is an identifier (ID) assigned to each cell (Cell) in a public mobile network (Public Land Mobile Network). The notification generation unit 104 notifies the generated radio resource control connection reconfiguration request message to the base station device 500-3 (CE3) that is a reconnection cell via the communication unit 102.

  When a radio resource control connection re-establishment (Radio Resource Control Connection Re-establishment) message is input via the communication unit 102, the notification processing unit 105 receives identification information about the connection destination base station apparatus to the notification generation unit 104. Output. When the identification information regarding the connection destination base station apparatus is input from the notification processing unit 105, the notification generation unit 104 generates a radio resource control connection reconfiguration complete (RRC Connection Re-establishment Complete) message. The notification generation unit 104 notifies the generated radio resource control connection reconfiguration completion message to the base station device 500-3 (CE3) of the reconnection cell via the communication unit 102.

FIG. 5 is a schematic block diagram illustrating an example of the configuration of the base station device 500-1 according to the present embodiment.
Base station apparatus 500-1 includes transmission / reception antenna 501, mobile station apparatus communication section 502, reception section 503, notification section 504, and network communication section 505.
In addition, base station apparatus 500-1 has other generally known functions of the base station apparatus, but illustration and description thereof are omitted.

  The mobile station apparatus communication unit 502 performs up-conversion / down-conversion, modulation / demodulation, encoding / decoding, mapping / demapping, etc., and performs data transmission / reception with the mobile station apparatus 100. The mobile station apparatus communication unit 502 outputs the measurement result report message notified from the mobile station apparatus 100 to the reception unit 503. The accepting unit 503 outputs a handover instruction to the notification unit 504 based on the measurement result report message input from the mobile station apparatus communication unit 502. When a handover instruction is input from the reception unit 503, the notification unit 504 generates a handover pre-processing message.

  The notification unit 504 notifies the generated handover preprocessing message to the base station device 500-2 (CE2) that is the target cell via the network communication unit 505. Upon receiving a handover pre-processing Ack (Handover Preparation Ack) message via the network communication unit 505, the reception unit 503 outputs a handover instruction to the notification unit 504.

  When a handover instruction is input from the accepting unit 503, the notification unit 504 generates a radio resource control reconfiguration message (RRC Connection Reconfiguration) that is a handover command. The notification unit 504 notifies the mobile station apparatus 100 of the generated radio resource control reset message via the mobile station apparatus communication unit 502. The accepting unit 503 is notified of the information transfer request (Request ‘UE context’) message regarding the mobile station apparatus (UE) 100 via the network communication unit 505.

  The accepting unit 503 outputs the received request message for mobile station apparatus information to the notifying unit 504. Here, the mobile station apparatus information (UE Context) is information on the call type (bearer) of the mobile station apparatus (UE) 100, communication network internal path information (network internal routing information), and the base station apparatus 500-1. , 500-2, 500-3, and the base station apparatus 600, information such as control information of the mobile station apparatus 100 held by the radio access network. The notification unit 504 generates a mobile station apparatus information message based on the input request for mobile station apparatus information. The notification unit 504 notifies the generated mobile station device information message to the base station device 500-3 via the network communication unit 505.

FIG. 6 is a schematic block diagram illustrating an example of the configuration of the base station device 500-2 according to the present embodiment.
When the base station device 500-1 and the base station device 500-2 are compared, the receiving unit 503 is deleted, and the processing unit 506 is added. The other configuration is the same as that of the base station device 500-1, and a description thereof will be omitted. The notification unit 504 will be described because the operation is different.
In addition, the base station device 500-2 has other generally known functions of the base station device, but illustration and description thereof are omitted.

  The processing unit 506 is notified of a handover preparatory processing (Handover Preparation) message via the network communication unit 505. When the handover pre-processing message is notified, the processing unit 506 performs pre-processing related to handover. The processing unit 506 outputs to the notification unit 504 an end notification indicating that the preliminary processing related to the handover has ended.

  When an end notification is input from the processing unit 506, the notification unit 504 generates a pre-handover processing Ack (Handover Preparation Ack) message for the pre-handover processing. The notification unit 504 notifies the generated pre-handover processing Ack message to the base station device 500-1 via the network communication unit 505.

FIG. 7 is a schematic block diagram illustrating an example of the configuration of the base station device 500-3 according to the present embodiment.
When the base station device 500-1 and the base station device 500-3 are compared, the receiving unit 503 is deleted and the connection unit 507 is added. The other configuration is the same as that of the base station device 500-1, and a description thereof will be omitted. The notification unit 504 will be described because the operation is different.
In addition, the base station device 500-3 includes other generally known functions of the base station device, but illustration and description thereof are omitted.

  When the connection unit 507 is notified of a radio resource control connection re-establishment request (RRC Connection Re-establishment Request) message via the mobile station device communication unit 502, the connection unit 507 identifies identification information (GCI) related to the base station device included in the message. ). The connection unit 507 outputs the read identification information (GCI) regarding the base station device to the notification unit 504. When the identification information (GCI) related to the base station device is input from the connection unit 507, the notification unit 504 generates a mobile station device information request (Request 'UE Context') message for the base station device.

  The notification unit 504 notifies the generated mobile station device information request message to the base station device 500-1 via the network communication unit 505. When the mobile station apparatus information notification (Send 'UE Context') message is notified from the base station apparatus 500-1 via the network communication section 505, the connection section 507 resets the radio resource control connection (not shown) to the notification section 504. RRC Connection Re-establishment) message is generated. The notification unit 504 notifies the generated radio resource control connection reconfiguration message to the mobile station device 100 via the mobile station device communication unit 502.

  The connection unit 507 is notified of a radio resource control connection reconfiguration complete (RRC Connection Re-establishment Complete) message from the mobile station device 100 via the mobile station device communication unit 502. Thereby, base station apparatus 500-3 completes the handover from base station apparatus 500-1 to base station apparatus 500-3, and establishes connection with mobile station apparatus 100.

FIG. 8 is a schematic diagram illustrating an example of an identification information allocation method related to the base station apparatus according to the present embodiment.
The image G100 is an image that shows an example of a message format that the mobile station apparatus (UE) 100 transmits to E-UTRAN.
In the function G110 of the identifier of the mobile station apparatus (UE) 100 in the image G100, the process G111 sets identification information (GCI: Global Cell Identity) regarding the base station apparatus. In addition, in the GCI function G120 in the image G100, an identifier assigned to each cell is set in a public mobile network (PLMN: Public Land Mobile Network).

FIG. 9 is a schematic sequence diagram illustrating an example of connection reconfiguration processing in the mobile station device 100 and the base station device (E-UTRAN) 500 according to the present embodiment.
Mobile station apparatus 100 transmits a radio resource control connection reconfiguration request (RRC Connection Re-establishment Request) message to base station apparatus (E-UTRAN) 500 (ST101). Base station apparatus (E-UTRAN) 500 transmits a radio resource control connection reconfiguration (RRC Connection Re-establishment) message to mobile station apparatus 100 (ST102). The mobile station apparatus 100 transmits a radio resource control connection reconfiguration request completion (RRC Connection Re-establishment Complete) message. Thereby, the mobile station apparatus 100 performs a handover with the base station apparatus (E-UTRAN) 500.

FIG. 10 is a sequence diagram illustrating a comparative example of the connection resetting process according to the present embodiment.
The mobile station apparatus 100 communicates with the base station apparatus 500-1 (CE1) that is a source cell (ST200).
The measurement unit 103 of the mobile station apparatus 100 performs measurement related to communication quality. The notification generation unit 104 of the mobile station device 100 generates a measurement result report (Measurement Report) message and notifies the base station device 500-1 via the communication unit 102 (ST201).

  When the base station apparatus 500-1 is notified of the measurement result report message from the mobile station apparatus 100, the base station apparatus 500-2 (CE2), which is a target cell (Target Cell), transmits a handover preparatory message. (ST202). When the base station apparatus 500-2 is notified of the handover pre-processing message from the base station apparatus 500-1, the base station apparatus 500-2 performs pre-handling processing of the handover, and sends a handover pre-processing Ack (Handover Preparation Ack) message to the base station apparatus 500-1. Notification is made (ST203).

Base station apparatus 500-1 notifies mobile station apparatus 100 of a radio resource control reconfiguration message that is a handover command (ST204).
When the mobile station apparatus 100 is notified of the radio resource control reconfiguration message from the base station apparatus 500-1, the mobile station apparatus 100 notifies the base station apparatus 500-2 of a random access preamble message (ST205). Here, it is assumed that the mobile station apparatus 100 is not notified of the random access preamble that the base station apparatus 500-2 is to notify. That is, the handover from the base station device 500-1 to the base station device 500-2 fails.

Detection unit 106 of mobile station apparatus 100 detects the best cell, for example, base station apparatus 500-3 (CE3) (ST206).
The mobile station apparatus 100 notifies a radio resource control connection reconfiguration request (RRC Connection Re-establishment Request) message to the base station apparatus 500-3 (CE3) which is a reconnection cell (Re-establishment Cell) (ST207). .

Base station apparatus 500-3 notifies mobile station apparatus 100 of a radio resource control connection reconfiguration (RRC Connection Re-establishment) message (ST208).
Mobile station apparatus 100 transmits a radio resource control connection reconfiguration complete (RRC Connection Re-establishment Complete) message to base station apparatus 500-3 (ST209). Thereby, the handover from base station apparatus 500-1 to base station apparatus 500-3 is performed.

FIG. 11 is a sequence diagram illustrating an example of the connection resetting process according to the present embodiment.
The mobile station apparatus 100 communicates with the base station apparatus 500-1 (CE1) which is a source cell (ST300).
The measurement unit 103 of the mobile station apparatus 100 performs measurement related to communication quality. The notification generation unit 104 of the mobile station apparatus 100 generates a measurement result report (Measurement Report) message and notifies the base station apparatus 500-1 via the communication unit 102 (ST301).

  When the base station apparatus 500-1 is notified of the measurement result report message from the mobile station apparatus 100, the base station apparatus 500-2 (CE2), which is a target cell (Target Cell), transmits a handover preparatory message. (ST302). When the base station apparatus 500-2 is notified of the handover pre-processing message from the base station apparatus 500-1, the base station apparatus 500-2 performs pre-handling processing of the handover, and sends a handover pre-processing Ack (Handover Preparation Ack) message to the base station apparatus 500-1. Notification is made (ST303).

Base station apparatus 500-1 notifies mobile station apparatus 100 of a radio resource control reset (RRC Reconfiguration) message that is a handover command (Handover Command) (ST304).
When the mobile station apparatus 100 is notified of the radio resource control reconfiguration message from the base station apparatus 500-1, the mobile station apparatus 100 notifies the base station apparatus 500-2 of a random access preamble message (ST305). Here, it is assumed that the mobile station apparatus 100 is not notified of the random access preamble that the base station apparatus 500-2 is to notify. That is, the handover from the base station device 500-1 to the base station device 500-2 fails.

Detection unit 106 of mobile station apparatus 100 detects the best cell, for example, base station apparatus 500-3 (CE3) (ST306).
The mobile station apparatus 100 notifies a radio resource control connection reconfiguration request (RRC Connection Re-establishment Request) message to the base station apparatus 500-3 (CE3) which is a reconnection cell (ST-307). . At this time, the radio resource control connection reconfiguration request message includes identification information (GCI) related to the base station apparatus. Here, the identification information (GCI) related to the base station apparatus is identification information indicating a cell of the base station apparatus.

Base station apparatus 500-3 notifies mobile station apparatus information (UE context) transfer request (Request 'UE Context') message to base station apparatus 500-1 (ST308).
Base station apparatus 500-1 notifies mobile station apparatus information (UE context) notification (Send 'UE Context') message to base station apparatus 500-3 (ST309).

Base station apparatus 500-3 notifies mobile station apparatus 100 of a radio resource control connection reconfiguration (RRC Control Connection Re-establishment) message (ST310).
Mobile station apparatus 100 transmits a radio resource control connection reconfiguration complete (RRC Connection Re-establishment Complete) message to base station apparatus 500-3 (ST311). Thereby, the connection unit 507 performs handover from the base station device 500-1 to the base station device 500-3, and establishes a connection between the mobile station device 100 and the base station device 500-3.

  In this embodiment, mobile station apparatus information (UE context) is notified from the base station apparatus 500-1 (first base station apparatus) to the base station apparatus 500-3 (second base station apparatus). However, when performing reconnection (Re-establishment) with a base station apparatus accommodated in a gateway apparatus (core network 200) that does not have mobile station apparatus information, the reconnection cell (Re-establishment Cell) The station device information may be acquired from the gateway device (core network 200).

  In addition, when the link with the base station apparatus connected while the mobile station apparatus 100 is moving, data that the mobile station apparatus 100 has not confirmed is transmitted between the base station apparatuses using the X2 link. It may be retransmitted to the apparatus 100.

  Further, the mobile station apparatus 100 measures the received signal strengths of a plurality of reference signals (Reference Signals), and compares the measured received signal strengths of the plurality of reference signals to perform handover to a cell (base station apparatus) with high reception quality. May be. Further, even in a handover between different types of systems, for example, a handover between a 3G network and an LTE network, if the mobile station apparatus supports both communication methods, the handover can be performed in the same manner.

  Thus, according to the present embodiment, the mobile station device 100, the first base station device (base station device 500-1) that is the connection source (source cell) of the mobile station device 100, and the mobile station device 100 It is a radio | wireless communications system provided with the 2nd base station apparatus (base station apparatus 500-3) which is a candidate of a connection destination (reconnection cell). The 1st communication part (communication part 102) of the mobile station apparatus 100 is a connection reset request | requirement (RRC Connection Re-establishment Request) including the identification information (GCI) regarding the 1st base station apparatus (base station apparatus 500-1). Is transmitted to the second base station apparatus (base station apparatus 500-3).

  As a result, the connection can be reliably reset. Further, even when the mobile station device selects a cell (base station device) that does not have mobile station device information as a reconnection destination, it is possible to avoid a handover failure.

  The second communication unit (network communication unit 505) of the second base station device (base station device 500-3) receives the first base station device (base station) indicated by the identification information (GCI) included in the connection resetting request. The mobile station apparatus information transfer request is transmitted to apparatus 500-1). Based on the transfer request, the third communication unit (network communication unit 505) of the first base station device (base station device 500-1) transmits the mobile station device information to the second base station device (base station device 500). -3).

  The identification information regarding the first base station apparatus is identification information indicating a cell of the base station apparatus. The mobile station apparatus information is stored in a radio access network including the first base station apparatus (base station apparatus 500-1) and the second base station apparatus (base station apparatus 500-3). Control information.

  As a result, the connection can be reliably reset. Further, even when the mobile station device selects a cell (base station device) that does not have mobile station device information as a reconnection destination, it is possible to avoid a handover failure.

  The wireless communication system S1 includes a gateway device (core network 200) that communicates with the first base station device (base station device 500-1). The second communication unit (network communication unit 505) determines the gateway device (core network 200) based on the identification information (GCI) related to the first base station device (base station device 500-1) included in the connection resetting request. The mobile station device information transfer request is transmitted. Based on the transfer request, the gateway device (core network 200) transmits the mobile station device information to the second base station device (base station device 500-3).

  As a result, the connection can be reliably reset. Further, even when the mobile station device selects a cell (base station device) that does not have mobile station device information as a reconnection destination, it is possible to avoid a handover failure.

  Note that a part or all of the mobile station device 100, the core network 200, and the base station devices 500-1, 500-2, 500-3, and 600 in the above-described embodiment may be realized by a computer. In that case, the program for realizing the control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by a computer system and executed.

  The “computer system” herein is a computer system built in the mobile station device 100, the core network 200, and the base station devices 500-1, 500-2, 500-3, 600, and includes an OS and peripherals. It shall include hardware such as equipment.

  The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” is a medium that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, In such a case, a volatile memory inside a computer system serving as a server or a client may be included and a program that holds a program for a certain period of time.

  The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  In addition, a part or all of the mobile station device 100, the core network 200, and the base station devices 500-1, 500-2, 500-3, and 600 in the above-described embodiment are integrated with an integrated circuit such as an LSI (Large Scale Integration). It may be realized as. Each functional block of the mobile station device 100, the core network 200, and the base station devices 500-1, 500-2, 500-3, and 600 may be individually converted into a processor, or a part or all of them may be integrated into a processor. May be. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. Further, in the case where an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology may be used.

  As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the scope of the present invention. It is possible to

DESCRIPTION OF SYMBOLS 100 Mobile station apparatus 101 Transmission / reception antenna 102 Communication part 103 Measurement part 104 Notification production | generation part 105 Notification process part 106 Detection part 200, 200-1, 200-2 Core network 300 Wireless network control apparatus 400, 400-1, 400-2 Base Station device 500, 500-1, 500-2, 500-3 Base station device 501 Transmission / reception antenna 502 Mobile station device communication unit 503 Reception unit 504 Notification unit 505 Network communication unit 506 Processing unit 507 Connection unit 600 Base station device S1 Wireless communication System N1 3G network N2 LTE network CE1, CE2, CE3 cell

Claims (11)

A wireless communication system comprising a mobile station device, a first base station device that is a connection source of the mobile station device, and a second base station device that is a candidate for a connection destination of the mobile station device,
The mobile station device
A first communication unit that transmits a connection reset request including identification information about the first base station device to the second base station device;
The second base station apparatus is
A second communication unit that acquires mobile station apparatus information related to the mobile station apparatus based on identification information related to the first base station apparatus included in the connection resetting request;
A connection unit for establishing a connection with the mobile station device based on the mobile station device information acquired by the second communication unit;
A wireless communication system comprising: The second communication unit is
Transmitting a transfer request for the mobile station apparatus information to the first base station apparatus indicated by the identification information included in the connection resetting request;
The first base station apparatus
The wireless communication system according to claim 1, further comprising a third communication unit that transmits the mobile station apparatus information to the second base station apparatus based on the transfer request.   The radio communication system according to claim 1 or 2, wherein the identification information related to the first base station apparatus is identification information indicating a cell of the first base station apparatus. The mobile station apparatus information is control information of a mobile station apparatus held by a radio access network including the first base station apparatus and the second base station apparatus. The radio | wireless communications system as described in any one of Claims 3. The wireless communication system includes:
Comprising a gateway device communicating with the first base station device;
The second communication unit is
Based on the identification information related to the first base station device included in the connection resetting request, a transfer request for the mobile station device information is transmitted to the gateway device,
The gateway device is
The wireless communication system according to claim 1, further comprising a third communication unit that transmits the mobile station apparatus information to the second base station apparatus based on the transfer request. A mobile station apparatus comprising: a communication unit that transmits a connection reconfiguration request including identification information related to a first base station apparatus that is a connection source to a second base station apparatus that is a connection destination candidate. A communication unit that is identification information included in the connection resetting request and acquires mobile station apparatus information related to the mobile station apparatus based on identification information related to another base station apparatus that is a connection source of the mobile station apparatus;
A connection unit for establishing a connection with the mobile station device based on the mobile station device information acquired by the communication unit;
A base station apparatus comprising: A control method in a mobile station device,
A control method comprising: a communication process of transmitting a connection reconfiguration request including identification information relating to a first base station apparatus that is a connection source to a second base station apparatus that is a connection destination candidate. A control method in a base station apparatus,
A communication process for acquiring mobile station apparatus information related to the mobile station apparatus based on identification information related to another base station apparatus that is a connection source of the mobile station apparatus, which is identification information included in the connection resetting request;
Based on the mobile station apparatus information acquired in the communication process, a connection process for establishing a connection with the mobile station apparatus,
A control method characterized by comprising: On the computer,
A program for executing communication means for transmitting a connection resetting request including identification information relating to a first base station apparatus that is a connection source to a second base station apparatus that is a connection destination candidate. On the computer,
Communication means for acquiring mobile station apparatus information related to the mobile station apparatus based on identification information included in the connection resetting request and based on identification information related to another base station apparatus that is a connection source of the mobile station apparatus;
Connection means for establishing a connection with the mobile station apparatus based on the mobile station apparatus information acquired by the communication means;
A program for running

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