[0001]The present invention relates to a communication system and a control method.
Background technique
[0002]
　LTE (Long Term Evolution) scheme, MDT (Minimization of Driving Test) is defined (non-patent document 1).
[0003]
　Technology for such MDT measurement is described in Patent Document 1. Patent Document 1, the target mobile station only when it the MDT measurement process with respect to (mobile terminal) is accepted, how to start a MDT measurement is described.
[0004]
　Also, when moving the mobile terminal, the handover is performed. Technology for this handover is described in Patent Documents 2 and 3. For example, Patent Document 2, based on the current position of the mobile terminal, the mobile terminal is described which switches the connection of the handover target to the radio base station.
[0005]
　In Patent Document 3, by using the information of the wireless terminal by the base station to grasp, by calculating the moving speed of the owner of the wireless terminal, it is described that estimate the behavior of the owner.
CITATION
Patent Literature
[0006]
Patent Document 1: JP 2012-129641 Patent Publication
Patent Document 2: JP 2005-252623 Patent Publication
Patent Document 3: JP 2013-168787 JP
Non-Patent Document
[0007]
Non-Patent Document 1: 3GPP TS32.422 V12.4.0 (2014-12)
Summary of the Invention
Problems that the Invention is to Solve
[0008]
　The moving speed of the mobile terminal, in the technology related to the above documents is estimated from the movement history of the cell. In such estimation, there is a difference between the actual moving speed, when the estimation accuracy is low in many cases. Accordingly, in handover such estimation accuracy with low moving speed, the success rate of handover is disadvantageously low.
[0009]
　The present invention has been made in view of the above problems, its object is to provide a technique for improving the success rate of the handover.
Means for Solving the Problems
[0010]
　Communication system according to one embodiment of the present invention includes a base station and mobile management device, the mobile management device, first receives the speed information of the mobile terminal based on the measurement information by the MDT (Minimization of Driving Test) comprising a first receiving means, and a first transmission means for transmitting to the base station a message including the speed information, the base station, a second receiving means for receiving a message including the speed information, the received based on the speed information, and a control means for performing handover control, the.
[0011]
　Control method according to one embodiment of the present invention is a control method for a communication system having a base station and mobile management device, the mobile management device, the mobile terminal based on the measurement information by the MDT (Minimization of Driving Test) receiving the speed information, and sends the message including the speed information to the base station,
　the base station receives the message including the speed information, on the basis of the received speed information, performs a handover control.
Effect of the invention
[0012]
　According to the present invention, it is possible to improve the success rate of the handover.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013]
FIG. 1 is a diagram showing an example of the overall configuration of a communication system according to a first embodiment of the present invention.
[2] a first base station of a communication system according to the embodiment, a functional block diagram illustrating an example of a mobile management device and trace collection server of the functional configuration of the present invention.
3 is a first base station of a communication system according to the embodiment, a block diagram illustrating an example of a hardware configuration of a mobile management device and trace collection server of the present invention.
4 is a sequence diagram showing an example of the operation of the first communication system according to an embodiment of the present invention.
5 is a sequence diagram showing an example of the operation of the first communication system according to an embodiment of the present invention.
6 is a sequence diagram showing an example of the operation of the first communication system according to an embodiment of the present invention.
7 is a sequence diagram showing an example of operation of the communication system according to a first embodiment of the present invention.
[8] The base station of the communication system according to a second embodiment of the present invention is a functional block diagram showing an example of a functional configuration of a mobile management device.
DESCRIPTION OF THE INVENTION
[0014]
　
　A first embodiment of the present invention, with reference to the accompanying drawings. Figure 1 is a diagram showing an example of the configuration of a communication system 1 according to this embodiment. Communication system shown in FIG. 1 1 is, for example, a communication system such as a cellular telephone network that is based on standards such as LTE (Long Term Evolution).
[0015]
　As shown in FIG. 1, a communication system 1 according to this embodiment, the user equipment (mobile terminal) 10, a base station 20, the mobile management device 30, and a trace collection server 40. Hereinafter, it referred to the user equipment 10 with UE (User Equipment) 10, a base station 20, also referred to as eNB (eNodeB) 20. Furthermore, the mobile management device 30, known as MME (Mobility Management Entity) 30, a trace collection server 40, also referred to as TCE (Trace Collection Entity) 40.
[0016]
　2, the base station 20 of the communication system 1 according to this embodiment is a functional block diagram showing an example of a functional configuration of a mobile management device 30 and the trace collection server 40. As shown in FIG. 2, the base station 20 includes a transmitter 21, receiver 22 and control unit 23. The mobile management device 30 includes a transmitter 31, receiver 32, controller 33 and a storage unit 34. Also, trace collection server 40 includes a transmitter 41, receiver 42, the calculating unit 43 and the storage unit 44. The base station 20 of the communication system 1 shown in FIG. 2, the mobile management device 30 and trace collection server 40 is a diagram illustrating the configuration specific to this embodiment. Accordingly, it is shown in FIG. 2, the base station 20, the mobile management device 30 and the trace collection server 40 may of course be have a member that is not shown in FIG.
[0017]
　(Base station 20)
　transmitting unit 21 of the base station 20 to the mobile management device 30, for example, transmits a signal such as initial UE message (Initial UE Message). The transmission section 21, to the user equipment 10 transmits an RRC (Radio Resource Control) signal such as a connection reconfiguration (RRC Connection Reconfiguration) message.
[0018]
　Receiver 22 of base station 20, from the user equipment 10, for example, receives a signal such as a RRC connection request (RRC Connection Request). Receiving unit 22 receives a signal such as initial context setup request (Initial Context Setup Request) from the mobile management device 30.
[0019]
　Signal transmitting unit 21 transmits to the user equipment 10 or the mobility management device 30, and the reception section 22 for the signal received from the user device 10 or the mobile management device 30 will be described later with reference to sequence diagrams.
[0020]
　Control unit 23 of the base station 20 controls the entire base station 20. Control unit 23, for example, the receiving unit 22 receives a certain request, a response to the request, and controls the transmission section 21 to transmit to the source of the request.
[0021]
　(Mobile management device 30)
　transmitting unit 31 of the mobile management device 30 transmits a signal such as initial context setup request to the base station 20. The transmitting unit 31, the trace collection server 40 transmits the velocity prediction value inquiry message will be described later, for example.
[0022]
　Receiving unit 32 of the mobile management device 30 receives a signal such as an initial UE message from the base station 20. The receiving unit 32 receives a speed prediction value response message from the trace collection server 40.
[0023]
　Incidentally, the signal transmitting unit 31 transmits to the base station 20 or trace collection server 40, and the receiving portion 32 for the signal received from the base station 20 or trace collection server 40, described later with reference to sequence diagrams.
[0024]
　Storage unit 34 of the mobile management device 30 stores the S1-ID, the IMSI of the user equipment 10 (International Mobile Subscriber Identity) and are associated with the data (also referred to as a table).
[0025]
　Control unit 33 of the mobile management device 30 controls the entire mobile management device 30. Control unit 33, for example, the receiving unit 32 receives a certain request, and controls to perform a process corresponding to the request. For example, the control unit 33, receiving unit 32 receives the initial UE messages from the base station 20, using the S1-ID included in the initial UE message, referring to stored in the storage unit 34 tables. Then, the control unit 33 identifies the IMSI associated with the S1-ID. Then, the control unit 33, to the transmission unit 31, an instruction to transmit the speed estimated value inquiry message including the IMSI to the trace collection server 40.
[0026]
　Further, for example, the control unit 33, the reception section 32 trace collection server 40, when receiving the speed predictive value response message, the rate prediction value included in the rate prediction value response message, initial context setup request information element ( IE: to set as the Information Element). Then, the control unit 33, to the transmission unit 31, an instruction to transmit the initial context setup request to the base station 20.
[0027]
　(Trace collection server 40)
　transmitting unit 41 of the trace collection server 40 transmits a response (speed prediction value response message) to the speed estimated value inquiry message to the mobile management device 30.
[0028]
　Receiver 42 of the trace collection server 40, as described in Non-Patent Document 1, have been reported from the user device 10 receives the measurement information according to the Logged MDT or Immediate MDT. Receiving unit 42 stores the measurement information received in the storage unit 44. The receiving unit 42 receives a speed prediction value query message from the mobile management device 30.
[0029]
　Storage unit 44 of the trace collection server 40 is stored measurement information according to the Logged MDT or Immediate MDT. This measurement information is managed for each IMSI. Further, the measurement information includes position information of the user equipment 10 at a given time.
[0030]
　Calculating section 43, based on the measurement information of the IMSI the receiving unit 42 is included in the rate prediction value inquiry message received, and calculates the speed estimated value of the user equipment 10 specified by the IMSI (velocity information). Specifically, the calculation unit 43 uses the IMSI for identifying the user equipment 10 calculates the target speed estimated value, stored in the storage unit 44, the measurement information of the user equipment 10 to be identified by the IMSI Extract. The calculation unit 43, based on the extracted measurement information to predict the speed of the user equipment 10 at the present time, and calculates the information representing the rate predicted as a speed prediction value. The rate prediction value, such as speed of the user device 10, the numerical may be one represented by the data, a numerical data from the mapped values ​​of such speed (e.g., a High / Medium / Low) it may be.
[0031]
　Here, the method of calculating the velocity prediction value by the calculating unit 43 will be described. Incidentally, the method of calculating the velocity predicted values ​​described below is merely an example, the rate prediction value calculating unit 43 in this embodiment is calculated is not limited thereto.
[0032]
　First, the calculation unit 43, based on the measurement information, for example, to predict the speed of the user equipment 10 from the current time until after the predetermined time. For example, calculation unit 43 uses the time and date information included in the measurement information, the current date (weekdays and holidays, weekday, etc.) to identify the measurement information similar to and times. The calculation unit 43, based on the specified measurement information, to predict the speed of the user equipment 10 from the current time until after the predetermined time. At this time, the calculation unit 43 of the speed calculated by using the measurement information identified, to the maximum speed may be speed prediction value may be the speed estimated value of average speed.
[0033]
　(Hardware For Hardware Configuration)
　FIG. 3, the base station 20 of the communication system 1 according to this embodiment is a diagram illustrating an example of a hardware configuration of a mobile management device 30 and the trace collection server 40. As shown in FIG. 3, the base station 20 includes a transmitter 201, a receiver 202 and a processor 203. The mobile management device 30 includes a transmitter 301, a receiver 302, a processor 303 and memory 304. Also, trace collection server 40 includes a transmitter 401, a receiver 402, a processor 403 and memory 404. The base station 20 of the communication system 1 shown in FIG. 3, the mobile management device 30 and trace collection server 40 is a diagram illustrating the configuration specific to this embodiment. Accordingly, it is shown in FIG. 3, the base station 20, the mobile management device 30 and the trace collection server 40 may of course be have a member that is not shown in FIG.
[0034]
　Transmitter 21 of the base station 20 described above is implemented by the transmitter 201. Receiver 22 of the base station 20 is implemented by the receiver 202. The control unit 23 of the base station 20 is realized by the processor 203. Note that transmitter 201 and receiver 202 of base station 20 can also operate as together, transceiver or transceiver circuitry.
[0035]
　Transmitter 31 of the mobile management device 30 described above is implemented by the transmitter 301. Receiving unit 32 of the mobile management device 30 is realized by the receiver 302. The control unit 33 of the mobile management device 30 is realized by the processor 303. Storage unit 34 of the mobile management device 30 is realized by the memory 304. Note that transmitter 301 and receiver 302 of the mobile management device 30 can also operate as together, transceiver or transceiver circuitry.
[0036]
　Transmitter 41 of the trace collection server 40 described above is implemented by the transmitter 401. Receiver 42 of the trace collection server 40 is implemented by the receiver 402. Further, the calculation unit 43 of the trace collection server 40 is implemented by the processor 403. Storage unit 44 of the trace collection server 40 is realized by the memory 404. Note that transmitter 401 and receiver 402 of the trace collection server 40 may also operate as together, transceiver or transceiver circuitry.
[0037]
　(Operation of Communication System 1)
　will now be described with reference to the communication system 1 operates to FIGS 4. FIGS. 4-7, respectively, is a sequence diagram showing the operation of the communication system 1 according to this embodiment. Sequence diagram of FIG. 4, during RRC connection establishment, the base station 20 shows the flow for determining the measurement configuration information corresponding to the moving speed of the user equipment 10.
[0038]
　As shown in FIG. 4, first, the user equipment 10 transmits an RRC connection request to the base station 20 (RRC Connection Request) (step S401). Then, receiver 22 of base station 20 receives the RRC connection request, the transmitting unit 21 to the user equipment 10, and returns the RRC connection setup notification (RRC Connection Setup) (step S402). Thereafter, the user device 10 transmits to the process of registration in the network, RRC connection setup completion notification to the base station 20 (RRC Connection Setup Complete) (step S403). Thus, RRC connection is established.
[0039]
　When RRC connection is established, the transmission unit 21 of the base station 20 transmits an initial UE message (Initial UE Message) to the mobile management device 30 (step S404). When the receiving unit 32 of the mobile management device 30 receives the initial UE message, the control unit 33 uses the S1-ID contained in the initial UE message, with reference to the stored in the storage unit 34 the table, in step S401 It identifies the IMSI of the user equipment 10 that transmitted an RRC connection request. Then, the transmitter 31 of the mobile management device 30, at the time it receives the initial UE message, the velocity predicted value related to the identified IMSI (target IMSI), inquires to the trace collection server 40 (step S405). In other words, the transmitter 31 of the mobile management device 30 transmits the velocity prediction value inquiry message to the trace collection server 40. The speed estimated value inquiry message, including the target IMSI.
[0040]
　Receiver 42 of the trace collection server 40, the mobile management device 30 receives the speed estimated value inquiry message calculation unit 43 calculates the velocity prediction value of the target IMSI contained in the speed estimated value inquiry message (step S406 ). Then, the transmission unit 41 of the trace collection server 40, the response speed prediction value inquiry message message including the speed estimated value as (velocity prediction value response message) to the mobile management device 30 (step S407).
[0041]
　Control unit 33 of the mobile management device 30 includes a receiving unit 32 a speed prediction value included in the rate prediction value response message received from the trace collection server 40 is set as the IE initial context setup request (Initial Context Setup Request). Then, the transmitter 31 of the mobile management device 30 transmits the initial context setup request to the base station 20 (step S408).
[0042]
　Receiving part of a base station 20 22 receives the initial context setup request from the mobile management device 30. Thereafter, the control unit 23 of base station 20, corresponding to the speed prediction value included as an IE in the initial context setup request, to determine the measurement configuration information necessary terminal measurement (Measurement Configuration). Then, the transmitting unit 21 of the base station 20, the user equipment 10 transmits an RRC connection reconfiguration (RRC Connection Reconfiguration) message including the measurement configuration information (step S409). This, in the RRC connection reconfiguration message includes, for example, measurement configuration information in the following (A) ~ (C).
(A) UE 10 is RSRQ (Reference Signal Received Quality), RSRP (Reference Signal Received Power) the threshold to be met when reporting to the
eNB, the information about cells to be set as the (B) adjacent
cells, (C) Time-to Trigger ( TTT) information related to the handover parameters such as.
[0043]
　The above (B), for example, the cell set as the adjacent cell, is information indicating not to include small cell (small cell). Further, the (C) is information indicating a time longer than the current time TTT. The information included in the measurement configuration information are not intended to limit the above (A) to (C).
[0044]
　Thereafter, the user device 10, the response to the RRC connection reconfiguration message (RRC Connection Reconfiguration Complete), to the base station 20 (step S410). Then, the transmitting unit 21 of the base station 20, the mobile management device 30 transmits a response to initial context setup request (Initial Context Setup Response) (Step S411).
[0045]
　By the above operation, the base station 20 can acquire a speed prediction value of the user equipment 10 to which to obtain measurement information. Further, the base station 20 determines the measurement configuration information corresponding to the moving speed of the user equipment 10 transmits the measurement configuration information to the user equipment 10 is included in the RRC connection reconfiguration message. Accordingly, the user equipment 10 and the base station 20, according to the moving speed of the user equipment 10, it is possible to perform an RRC connection. The user equipment 10, based on the measurement configuration information corresponding to the speed of the user equipment 10 can perform MDT measurement process.
[0046]
　Next, referring to FIG. 5, the operation of the communication system 1. Sequence diagram of FIG. 5, the mobile management device 30, the trace collection server 40 illustrates a flow of sending a speed prediction value query message periodically.
[0047]
　Transmitter 31 of the mobile management device 30 periodically transmits a speed prediction value inquiry message to the trace collection server 40 (step S501). The trace collection server 40 which has received the rate prediction value inquiry message, calculates the speed estimated value (step S502), and transmits the velocity prediction value response message (step S503). Incidentally, step S503 from step S501, respectively, it is the same operation as steps S405 ~ step S407 described above, and detailed description thereof will be omitted.
[0048]
　Thereafter, the receiving unit 32 of the mobile management device 30 receives a speed prediction value response message transmitted from the trace collection server 40. Then, the control unit 33 of the mobile management device 30 determines a speed prediction value included in the speed estimated value response message, whether the speed prediction value included in the rate prediction value response message received in the past the same . When the speed estimated value is different (the speed estimated value is changed), the transmission unit 31, UE context modification request including the rate prediction value received from the trace collection server 40 as the IE (UE Context Modification Request) to send (step S504). The control unit 33, the speed predictive value, for example, if the speed, if the speed difference is greater than a predetermined threshold value, the speed predictive value may be determined to differ.
[0049]
　Then, receiver 22 of base station 20, when the mobile management device 30 receives the UE context modification request, control unit 23 of base station 20, corresponding to the speed prediction value included as an IE in the UE context modification request, determining a measurement configuration information necessary terminal measurement. Then, the transmitting unit 21 of the base station 20, the RRC connection reconfiguration message including the measurement configuration information to the user device 10 (step S505). This, in the RRC connection reconfiguration message includes measurement configuration information described above (A) ~ (C).
[0050]
　Thereafter, the user device 10, the response to the RRC connection reconfiguration message (RRC Connection Reconfiguration Complete), to the base station 20 (step S506). Then, the transmitting unit 21 of the base station 20, the mobile management device 30 transmits the response of the UE context modification request (UE Context Modification Response) (Step S507).
[0051]
　By the above operation, the mobile management device 30 can be notified that the moving speed of the user equipment 10 is changed to the base station 20. Further, the base station 20, each time the moving speed of the user equipment 10 is changed, to determine the measurement configuration information to the user equipment 10, including the measurement configuration information to the RRC connection reconfiguration message. Accordingly, the user equipment 10 and the base station 20, according to the moving speed of the user equipment 10, it is possible to perform an RRC connection. The user equipment 10, based on the measurement configuration information corresponding to the speed of the user equipment 10 can perform MDT measurement process.
[0052]
　The base station 20 periodically, the mobile management device 30 may send a message inquiring the speed estimated value. The mobile management device 30 receives the message, it may perform the step S501. In this case, the mobile management device 30, the presence or absence of a change in the velocity estimated value, without determining, as a response to the message, may be carried out step S504.
[0053]
　With the above configuration, the base station 20, at an arbitrary timing, it is possible to obtain a speed prediction value of the user equipment 10 of interest.
[0054]
　Next, referring to FIG. 6, the operation of the communication system 1. Sequence diagram of FIG. 6 shows a flow of operation of the communication system 1 when taking the S1 handover. In FIG. 6, the base stations 20 is called a handover source base station 20 and SeNB (Source eNodeB), referred to as handover destination base station 20 and TeNB (Target eNodeB). Here, as described with reference to FIGS. 4 and 5, between the user equipment 10 and the base station 20, the RRC connection corresponding to the moving speed of the user equipment 10 is established.
[0055]
　SeNB, based on the speed estimated value contained in the UE context modification request sent by the initial context setup request or step S504 that was transmitted in step S408 described above, performs the handover. Specifically, SeNB transmits to the mobile management device 30 requires handover (Handover required) message (step S601). SeNB this time, regarding the user equipment 10 of the handover target, the speed estimated value received in step S408 or step S504 (the speed information), and transmits included in the handover required message.
[0056]
　When the receiving unit 32 of the mobile management device 30 receives the handover required message, the control unit 33 uses the S1-ID indicating the user equipment 10 of the handover target, with reference to the stored in the storage unit 34 tables the It identifies the IMSI of the user equipment 10. Then, the transmitter 31 of the mobile management device 30, at the time of receiving the handover required message, the speed predictive value inquiry message about the identified IMSI (target IMSI), and transmits to the trace collection server 40 (step S602). The speed estimated value inquiry message, including the target IMSI.
[0057]
　The trace collection server 40 which has received the rate prediction value inquiry message, calculates the speed estimated value (step S603), and transmits the velocity prediction value response message (step S604). Incidentally, step S604 from step S602, respectively, it is the same operation as steps S405 ~ step S407 described above, and detailed description thereof will be omitted.
[0058]
　Then, it transmits the reception unit 32 of the mobile management device 30 receives the speed estimated value response message, transmitting unit 31 for TeNB, handover request indicating the S1 handover for the user equipment 10 of the handover target (Handover Request) (step S605). At this time, the transmission unit 31, to the handover request, including a speed prediction value included in the rate prediction value response message IE. The transmitter 31 is, in the handover request, including the S1-ID of the user device 10 of the handover target. The mobile management device 30, when transmitting from the step S602 the handover request before performing the step S604 to the TeNB, the rate prediction value included in the handover required message step S601, be transmitted included in the handover request good. Thus, SeNB is a speed prediction value of the acquired user equipment 10 can inform the TeNB.
[0059]
　Receiver 22 of the TeNB receives the handover request from the mobile management device 30. The TeNB by S1-ID included in the handover request, it is possible to identify the user equipment 10 of the handover destination. Control unit 23 of the TeNB, according to the speed prediction value included as an IE in the handover request, determines the measurement configuration information necessary terminal measurement (Measurement Configuration). Then, the transmission unit 21 of the TeNB, the mobile management device 30 transmits a handover request response including the measurement configuration information (Handover Request Acknowledge) (step S606).
[0060]
　When the receiving unit 32 of the mobile management device 30 receives the handover request response transmission unit 31, to the SeNB, it transmits a handover instruction (Handover Command) (step S607). At this time, the transmission unit 31, a measurement configuration information included in the handover request response, including a handover instruction.
[0061]
　Receiver 22 of the SeNB has received the handover instruction, the transmission unit 21, an RRC connection reconfiguration message prompting an RRC connection destination change, and transmits to the user equipment 10 (step S608). At this time, the transmission unit 21, a measurement configuration information included in the handover instruction, included in the RRC connection reconfiguration message. This, in the RRC connection reconfiguration message includes, for example, measurement configuration information described above (A) ~ (C).
[0062]
　The communication system 1 continues processing relating S1 handover in accordance with the moving speed of the user equipment 10.
[0063]
　By the above processing, the base station 20 can perform the S1 handover for the user equipment 10 of a subject. The user equipment 10 can perform the TeNB, an RRC connection based on the measurement configuration information determined according to the moving speed of the user equipment 10.
[0064]
　Next, with reference to FIG. 7, the operation of the communication system 1. Sequence diagram of FIG. 7 shows the flow of operation of the communication system 1 when X2 handover. In FIG. 7, similarly to FIG. 6, referred to the handover source base station 20 and SeNB, called the handover destination base station 20 and TeNB.
[0065]
　SeNB, based on the speed estimated value contained in the UE context modification request sent by the initial context setup request or step S504 that was transmitted in step S408 described above, to start the handover. Specifically, SeNB transmits a handover request to the TeNB the (Handover Request) (step S701). SeNB this time, regarding the user equipment 10 of the handover target, the speed estimated value received in step S408 or step S504 (the speed information), and S1-ID indicating the user equipment 10 of the handover target, included in the handover request to send Te. Thus, SeNB is a speed prediction value of the user equipment 10 can inform the TeNB.
[0066]
　Receiver 22 of the TeNB is, upon receiving the handover request, the transmitting unit 21 of the TeNB, the SeNB, transmits a handover request response (Handover Request Acknowledge) (step S702).
[0067]
　The communication system 1 continues processing relating X2 handover in accordance with the moving speed of the user equipment 10.
[0068]
　Thereafter, the transmitting unit 21 of the TeNB to the mobile management device 30, and transmits a path switching request (Path Switch Request) (step S703).
[0069]
　When the receiving unit 32 of the mobile management device 30 receives the path switching request, the transmitting unit 31 transmits the velocity prediction value inquiry message to the trace collection server 40 (step S704). The trace collection server 40 which has received the rate prediction value inquiry message, calculates the speed estimated value (step S705), and transmits the velocity prediction value response message (step S706). Incidentally, step S706 from step S704, respectively, it is the same operation as steps S405 ~ step S407 described above, and detailed description thereof will be omitted.
[0070]
　Then, the receiving unit 32 of the mobile management device 30 receives the speed estimated value response message, transmitting unit 31 for TeNB, and transmits the response of the path switching request (Path Switch Request Acknowledge) (step S707). At this time, the transmission unit 31, the response of the path change request, including the rate prediction value included in the rate prediction value response message.
[0071]
　When the receiver section 22 of the TeNB receives the response of the path switching request, the control unit 23, determined according to the speed prediction value included in the response path switching request, the measurement configuration information necessary terminal measurement (Measurement Configuration) to. Then, the transmission unit 21 of the TeNB, including measurement configuration information described above (A) ~ (C), and transmits an RRC connection reconfiguration message (RRC Connection Reconfiguration) (step S 708).
[0072]
　Thereafter, the user device 10, the response to the RRC connection reconfiguration message (RRC Connection Reconfiguration Complete), and transmits to the TeNB (step S709).
[0073]
　By the above operation, the base station 20 can perform a handover according to the moving speed of the user equipment 10.
[0074]
　Incidentally, after completion of step S701, the words, the receiving section 22 of the TeNB is a handover request, when received from the SeNB, the control unit 23 according to the speed prediction value included in the handover request, required terminal measurement the measurement configuration information may be determined. Then, the mobile management device 30, before receiving a speed prediction value response message, when transmitting a response path switching request to the TeNB, transmitter 21 of the TeNB, RRC connection, including the measurement configuration information determined above it may send a reconfiguration message to the user equipment 10. With this configuration, the user equipment 10 via the base station 20 (TeNB) after the handover, it is possible to perform the MDT measurement process.
[0075]
　(Effect)
　communication system 1 in the present embodiment, as described above, the mobility management unit 30, the speed prediction value received from the trace collection server 40 message (speed information) was included as IE (e.g., initial context setup request ) to the base station 20. Then, the base station 20, on the basis of the velocity estimated value, performs handover control. Thus, the communication system 1 according to the present embodiment, a handover can be performed according to the moving speed.
[0076]
　For example, the moving speed is high user equipment, in HetNet (Heterogeneous Network), when is connected to a base station that covers a narrow range such as small cell or pico cell, it is necessary to frequently perform the handover. In this case, the handover fails or will be or not be synchronized between the base station 20, the success rate of handover may be reduced.
[0077]
　However, the communication system 1 according to this embodiment, in order to perform a handover according to the moving speed of the user equipment 10, for example, control such that the moving speed is not connected fast user equipment 10 to the base station that covers a narrow range It can be performed. Thus, it is possible to improve the success rate of the handover. The communication system 1, it is possible to control that the user equipment 10 performs a frequent handover, it is possible to reduce the amount of signals to be communicated.
[0078]
　
　Next, with reference to FIG. 8, a description will be given of a communication system 1 according to this embodiment. In this embodiment, a description will be given of a communication system 1 having the minimum configuration for solving the problems of the present invention. Since the overall configuration of the communication system 1 is the same as the communication system 1 shown in FIG. 1, the description thereof is omitted.
[0079]
　Figure 8 is included in the communication system 1 according to this embodiment is a functional block diagram showing an example of a functional configuration of a base station 50 and the mobile management device 60. As shown in FIG. 8, the base station 50 according to this embodiment includes a control unit 51, a receiving unit (second receiving unit) 52. The mobile management device 60 includes a transmitting unit (first transmitting unit) 61, and a receiving unit (first receiving unit) 62.
[0080]
　Receiving unit 62 of the mobile management device 60, similarly to the receiving portion 32 described above, it receives the speed information of the mobile terminal based on the mobile management device (TCE) in the measurement information by the MDT.
[0081]
　Transmission unit 61, like the transmitting unit 31 described above, the speed information receiving section 62 has received, including as IE, for example, initial context setup request (Initial Context Setup Request), to the base station 50.
[0082]
　Receiver 52 of base station 50, similarly to the receiving portion 22 described above, the mobile management device 60, a message including speed information (e.g., initial context setup request) to receive.
[0083]
　Control unit 51, based on the speed information is receiving unit 52 has received, performs handover control.
[0084]
　As described above, the communication system 1 according to this embodiment, as in the first embodiment described above, it is possible to perform a handover according to the moving speed.
[0085]
　Incidentally, the embodiments described above is a preferred embodiment of the present invention is not intended to limit the scope of this invention only to the above embodiments, those skilled in the art without departing from the spirit and scope of the present invention There performed modifications and substitutions of the foregoing embodiments, it is possible to construct a form which has been subjected to various modifications.
[0086]
　This application claims priority based on 2015 September Japanese Patent Application No. 2015-190572, filed on 29 days, the entire disclosure of which is incorporated herein.
DESCRIPTION OF SYMBOLS
[0087]
　1 communication system
　10 user equipment
　20 base station
　21 transmission unit
　22 reception unit
　23 control unit
　201 transmitter
　202 receiver
　203 the processor
　30 mobile management device
　31 transmitting section
　32 receiving section
　33 control section
　34 memory unit
　301 transmitter
　302 receiver
　303 processor
　304 memory
　40 trace collection server
　41 transmission unit
　42 reception unit
　43 calculation unit
　44 storage unit
　401 transmitter
　402 receiver
　403 processor
　404 memory
　50 the base station
　51 the control unit
　52 receiving unit
　60 mobile management device
　61 transmitting section
　62 receiving section

claims

[Claim 1]A communication system having a base station and mobile management device,
　the mobile management
　　device, a first receiving means for receiving the speed information of the mobile terminal based on the measurement information by the MDT (Minimization of Driving Test),
　　the velocity comprising a first transmitting means for transmitting a message including information on the base station, and
　the base station,
　　a second receiving means for receiving a message including the speed information,
　　on the basis of the received speed information, handover communication system, comprising a control means for controlling the.
[Claim 2]
　It said control means, on the basis of the speed information, the a setting information in the measurement of the mobile terminal determines a measurement configuration information (Measurement Configuration),
　the base station, a radio resource control connection re-including the measurement configuration information communication system according to claim 1, further comprising a setup message (RRC Connection Reconfiguration) a second transmission means for transmitting to said mobile terminal, characterized in that.
[Claim 3]
　The communication system further includes a trace collection server that collects the measurement information,
　the first transmission means, to the trace collection server, sends a request for the rate information,
　the first receiving means, said speed information as a response to the request, the communication system according to claim 1 or 2, wherein receiving the speed information of the mobile terminal based on the measurement information, and wherein the.
[Claim 4]
　Wherein the first transmitting means
　　to periodically the trace collection server sends said request speed information,
　　and the speed information and speed information received in response to the request, included in the message transmitted to the base station If different, the communication system according to claim 3, wherein transmitting the modified request to the base station, characterized in that.
[Claim 5]
　The trace collection server, based on the measurement information, to predict the speed of the user equipment from the current time until after the predetermined time, and calculating means for calculating the speed information based on the speed that the predicted,
　and the calculated communication system according to claim 4, wherein the speed information, and transmission means for transmitting in response to the request, it is characterized.
[Claim 6]
　A method of controlling a communication system having a base station and mobile management device,
　the mobile management
　　device, receives the speed information of the mobile terminal based on the measurement information by the MDT (Minimization of Driving Test),
　　the speed information a message containing transmitted to the base station,
　the base station
　　receives a message including the speed information,
　　the control method based on the received speed information, performs handover control, characterized in that.
[Claim 7]
　Said base station, based on the speed information, the a setting information in the measurement of the mobile terminal determines a measurement configuration information (Measurement Configuration),
　said containing measurement configuration information radio resource control connection reconfiguration message (RRC Connection sending a Reconfiguration) to the mobile terminal, the control method according to claim 6, characterized in that.
[8.]
　The communication system, the further includes a trace collection server that collects measurement information,
　the mobile management device,
　　the trace collection server, sends a request for the velocity information,
　　as a response to the request of the speed information, the measurement the method according to claim 6 or 7 receives the speed information of the mobile terminal based on the information, characterized in that.
[Claim 9]
　The mobile management device,
　　regularly the trace collection server, sends a request for the rate information,
　　the rate information received in response to the request, the said speed information included in the message transmitted to the base station If different, the control method according to claim 8, wherein transmitting the modified request to the base station, characterized in that.
[Claim 10]
　The trace collection server, based on the measurement information, to predict the speed of the user equipment from the current time until after the predetermined time, calculates the velocity information based on the speed that the predicted and calculated the rate information the control method according to claim 9, wherein the transmitting in response a request, it is characterized.