WO2016139900A1 - 通信制御装置、通信システム、通信制御方法及び非一時的なコンピュータ可読媒体 - Google Patents
通信制御装置、通信システム、通信制御方法及び非一時的なコンピュータ可読媒体 Download PDFInfo
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- WO2016139900A1 WO2016139900A1 PCT/JP2016/000741 JP2016000741W WO2016139900A1 WO 2016139900 A1 WO2016139900 A1 WO 2016139900A1 JP 2016000741 W JP2016000741 W JP 2016000741W WO 2016139900 A1 WO2016139900 A1 WO 2016139900A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
- H04W28/12—Flow control between communication endpoints using signalling between network elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
- H04L47/2466—Traffic characterised by specific attributes, e.g. priority or QoS using signalling traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0205—Traffic management, e.g. flow control or congestion control at the air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
Definitions
- the present invention relates to a communication control device, a communication system, a communication control method, and a program, for example, a communication control device, a communication system, a communication control method, and a program that control parameters related to a mobile station.
- Mobile carriers manage mobile networks and provide voice communication and data communication services to users.
- control data necessary for executing data transmission between users or between a user and a server and user data such as audio data, image data, or moving image data are transmitted and received.
- the control data is also referred to as C-Plane data
- the user data is also referred to as U-Plane data.
- Patent Document 1 describes C-Plane data transmitted and received between a mobile terminal and a base station.
- the amount of C-Plane data transmitted / received at one time is about 100 bytes, and a handover process is performed to change the base station to which the mobile terminal is connected when the user having the mobile terminal moves.
- the amount of C-Plane data used for the execution is about 150 bytes.
- messages used when the handover process is performed include RRCControlConnection Reconfiguration (including mobilityControlInfo) (Downlink), RRC Connection Reconfiguration Complete (Uplink), and the like.
- messages used during normal operations other than handover processing include RRC Connection Connection Request (Uplink), RRC Connection Connection Setup (Downlink), RRC Connection Connection Setup Complete (Uplink), RRC Connection Connection Reconfiguration (not including mobilityControlInfo) (Downlink), RRC Connection Reconfiguration Complete (Uplink) etc.
- the amount of C-Plane data when one mobile terminal executes the handover process is about 150 bytes.
- the base station needs to secure a large amount of radio resources for the large number of mobile terminals that execute the handover process. For example, when many people having mobile terminals are moving by using a train, the handover process associated with the movement of the train is simultaneously executed in many mobile terminals. In such a case, the base station needs to allocate radio resources for transmitting and receiving a large amount of C-Plane data accompanying the handover process.
- An object of the present invention is to provide a communication control device, a communication system, a communication control method, and a program capable of reducing the influence on the throughput of U-Plane data when the communication amount of C-Plane data increases. It is in.
- the communication control apparatus includes a communication amount of the control data and a user data of a user data from a base station that allocates radio resources to transmit / receive control data and user data to / from a mobile station.
- a communication amount of the control data and a user data of a user data from a base station that allocates radio resources to transmit / receive control data and user data to / from a mobile station.
- the ratio of the communication amount of the control data and the information acquisition unit that acquires the ratio information indicating the ratio with the communication amount is greater than a predetermined threshold, the information is transmitted and received between the mobile station and the base station.
- a parameter control unit that changes a parameter related to the mobile station so as to reduce the control data.
- a communication system includes a base station that allocates radio resources for transmitting and receiving control data and user data between a mobile station and the mobile station, and the control station from the base station.
- An information acquisition unit that acquires communication information determined using a data communication amount and a user data communication amount; and that the control data communication amount is greater than a predetermined threshold in the communication information.
- a parameter control unit that changes a parameter related to the mobile station so as to reduce the control data transmitted and received between the mobile station and the base station. It is to be prepared.
- a communication control method includes a communication amount of the control data and a transmission amount of the user data from a base station that allocates radio resources to transmit / receive control data and user data to / from a mobile station. Communication information determined using communication amount, and when the communication information indicates that the control data communication amount is greater than a predetermined threshold, the mobile station and the base station The parameter related to the mobile station is changed so as to reduce the control data transmitted / received between the mobile stations.
- the program according to the fourth aspect of the present invention includes a communication amount of the control data and a communication amount of the user data from a base station that allocates radio resources to transmit / receive control data and user data to / from a mobile station. Between the mobile station and the base station, when the communication information of the control data is greater than a predetermined threshold in the communication information. The computer is caused to change a parameter related to the mobile station so as to reduce the control data transmitted and received in the mobile station.
- a communication control device capable of reducing the influence on the throughput of U-Plane data when the communication amount of C-Plane data increases.
- FIG. 1 is a configuration diagram of a communication system according to a first exemplary embodiment
- FIG. 3 is a configuration diagram of a communication system according to a second exemplary embodiment. It is a figure which shows the flow of the parameter change control process concerning Embodiment 2.
- FIG. It is a figure explaining Inactivity Timer concerning Embodiment 2.
- FIG. It is a figure which shows the flow of the change process of Inactivity
- FIG. It is a figure which shows the flow of the change process of Inactivity
- FIG. It is a figure which shows the flow of the change process of Inactivity
- FIG. 10 is a diagram showing a flow of parameter change control processing according to the third exemplary embodiment. It is a figure which shows the flow of the parameter change control process concerning Embodiment 4.
- FIG. 10 is a diagram showing a flow of parameter change control processing according to the third exemplary embodiment. It is a figure which shows the
- the communication system in FIG. 1 includes a mobile station 10, a base station 20, and a communication control device 30.
- the mobile station 10 may be a computer device such as a mobile phone terminal, a smartphone, a tablet terminal, or a personal computer having a communication function.
- the base station 20 allocates radio resources to transmit / receive control data and user data to / from the mobile station 10.
- the mobile station 10, the base station 20, and the communication control device 30 may be computer devices that operate when a processor executes a program stored in a memory.
- each component configuring the mobile station 10, the base station 20, and the communication control device 30 may be software or a module that is executed by a processor executing a program stored in a memory, It may be configured by a circuit or the like.
- the base station 20 and the mobile station 10 may perform wireless communication using a predetermined communication standard.
- the predetermined communication standard may be LTE (Long Term Evolution) whose standard is defined in 3GPP (3rd Generation Partnership Project), or other standard such as UMTS.
- LTE Long Term Evolution
- UMTS Universal Mobile Telecommunication Standard
- a base station control station (RNC) may correspond to the base station.
- the communication control device 30 includes an information acquisition unit 31 and a parameter control unit 32.
- the information acquisition unit 31 acquires ratio information indicating the ratio between the communication amount of control data and the communication amount of user data from the base station 20.
- the ratio information may be a ratio between the communication amount of control data and the communication amount of user data in the entire data transmitted and received by the base station 20, and when the base station 20 communicates with a plurality of mobile stations, each mobile station It may be a ratio between the amount of control data generated and the amount of user data transmitted.
- the communication amount may be a message size (content size) of control data or user data, for example, or may be a radio resource amount used when actually transmitting the data from the base station 20 to the mobile station 10.
- the parameter control unit 32 compares the communication data rate of the control data indicated in the ratio information with a predetermined threshold value.
- the predetermined threshold value may be, for example, information input by an administrator (for example, an operator) who manages the communication control device 30.
- the parameter control unit 32 sets parameters related to the mobile station 10 so as to reduce the control data transmitted and received between the mobile station 10 and the base station 20 when the ratio of the communication amount of control data is larger than the threshold. change. In other words, the parameter control unit 32 changes a parameter related to the mobile station 10 so as to reduce or suppress the generation frequency or generation opportunity of control data between the mobile station 10 and the base station 20.
- the parameter related to the mobile station 10 may be, for example, a parameter managed in the base station 20 or a parameter managed in another device.
- the parameter control unit 32 causes the mobile station 10 to increase or maintain control data transmitted / received between the mobile station 10 and the base station 20 when the ratio of the communication amount of control data is smaller than the threshold value. Change related parameters. In other words, the parameter control unit 32 changes the parameter related to the mobile station so as to increase or not suppress the generation frequency or generation opportunity of the control data between the mobile station 10 and the base station 20.
- the communication control apparatus 30 can acquire ratio information regarding the ratio of the communication amount of control data and user data communicated in the base station 20. Furthermore, the communication control apparatus 30 can adjust the increase / decrease of the control data transmitted / received between the mobile station 10 and the base station 20 according to the ratio of the control data.
- the communication control device 30 when the communication control device 30 determines that the ratio of the communication amount of the control data is larger than the threshold value, the communication control device 30 can be used due to the decrease of the control data by setting the parameter so as to decrease the control data. It is also possible to allocate radio resources to user data. In this case, since the throughput of the user data is improved, the communication control device 30 can prevent the throughput of the user data from being lowered due to the increase of the control data.
- the communication control device 30 determines that the proportion of the communication amount of the control data is smaller than the threshold value, the communication control device 30 performs call control of more communication terminals by setting a parameter to increase the control data. be able to. Therefore, the base station 20 can connect more communication terminals and can effectively use radio resources.
- the base station controls the communication amount (or the quantization information) of each of the control data and the user data together with the ratio information indicating the ratio of the control data communication amount and the user data communication amount. It may be sent to the device.
- the ratio information indicating the ratio between the communication amount of control data and the communication amount of user data
- information related to other communication amounts may be used. For example, the following may be considered.
- Comparison information indicating the magnitude relationship between control data communication volume and user data communication volume
- Data volume information indicating control data communication volume and user data communication volume
- Difference between control data communication volume and user data communication volume Difference information indicating Information including ratio information, comparison information, data amount information, and difference information, which is determined using the communication amount of control data and the communication amount of user data, is used as communication information.
- the communication system in FIG. 2 includes a UE (User Equipment) 11, an eNB (eNodeB) 21, an MME (Mobility Management Entity) 22, and a communication control device 30.
- UE User Equipment
- eNB eNodeB
- MME Mobility Management Entity
- the UE 11 corresponds to the mobile station 10 in FIG. UE 11 is used as a generic name for a mobile station in 3GPP.
- the eNB 21 corresponds to the base station 20 in FIG.
- the eNB 21 is a base station that supports LTE.
- the MME 22 is a node device that executes mobility management control of a UE connected to the eNB 21.
- the MME 22 is a node device defined in 3GPP.
- the communication control device 30 may acquire ratio information indicating the ratio of the communication amount of control data and user data from the eNB 21, and may control parameters set in the eNB 21 via the MME 22. Or the communication control apparatus 30 may control the parameter set to MME22, and may adjust the quantity of the control data generate
- the control data is called C-Plane, but in the present embodiment and other embodiments, the control data may be any of the following, for example. (1) Signaling of AS RRC layer (2) AS RRC layer signaling and NAS layer signaling (3) Signaling of the NAS layer. If there is no notice in the following, description will be made assuming (2) below.
- the flow of the parameter change control process according to the second embodiment of the present invention will be described with reference to FIG. It is assumed that data transmission / reception is performed between the plurality of UEs connected to the eNB 21 and the eNB 21 (S11).
- the UE is connected to the eNB 21, for example, the UE is located in a communication area formed by the eNB 21, and a radio communication line is set in a cell in the communication area between the UE and the eNB 21. (RRC_Connected).
- the data transmitted / received between UE and eNB21 contain control data and user data.
- ENB21 allocates radio resources for transmitting / receiving control data and radio resources for transmitting / receiving user data in order to transmit / receive control data and user data to / from UE.
- the eNB 21 does not separately manage radio resources that are limited resources such as radio resources for control data and radio resources for user data.
- control data is often generated suddenly and is preferentially processed as compared with user data. Therefore, radio resources are not divided into control data and user data in advance, but when control data needs to be transmitted / received, radio resources are preferentially allocated to control data.
- radio resources that are not assigned to the control data are used as the user data. By allocating radio resources in this way, when a large amount of control data is communicated, radio resources are preferentially assigned to the control data.
- the radio resource may be narrowly defined in terms of time and frequency, or may be broadly defined, for example, a communication opportunity given to the UE, an allocated frequency band, or transmission power.
- wireless resource may be the memory amount etc. which are used in eNB21.
- the eNB 21 transmits a message indicating the usage status of the radio resource to the communication control device 30 (S12).
- the message indicating the usage status of radio resources includes ratio information indicating the ratio of radio resources allocated to control data and user data (or information replacing the ratio information described above in the first embodiment).
- the ratio information may be, for example, a ratio of radio resources allocated to control data and a ratio allocated to user data with respect to radio resources of the entire eNB 21.
- the usage rate of the entire radio resource may be 90%
- the radio resource allocated to control data may be 30%
- the radio resource allocated to user data may be 60%, and the like.
- Or ratio information may show the ratio of the radio
- the radio resources allocated to the control data are 40%
- the radio resources allocated to the user data are 60%, and so on.
- the communication control device 30 determines a parameter set in the eNB 21 or the UE 11 according to the comparison result between the ratio of the radio resources allocated to the control data and the threshold value, and sends a message indicating the parameter change value to the MME 22. Transmit (S13). For example, when the ratio of radio resources allocated to control data exceeds a threshold, the communication control device 30 has a message having a parameter value changed so as to decrease control data generated between the UE and the eNB 21. Is transmitted to the MME 22.
- the communication control device 30 changes the parameter value changed so as to increase the control data generated between the UE and the eNB 21 or the UE and the eNB 21 A message having a parameter value changed so as to maintain control data generated during the period is transmitted to the MME 22. Or when maintaining the communication volume of the present control data, the communication control apparatus 30 may transmit the message which set the same value as the parameter value currently set to MME22.
- the MME 22 transmits a message indicating the parameter value after the change (or the same value as the current value) transmitted from the communication control device 30 to the eNB 21 (S14).
- the eNB 21 receives the message transmitted from the MME 22, the eNB 21 sets a parameter value included in the message transmitted from the MME 22.
- the message from the MME 22 to the eNB 21 may use, for example, S1AP MME Configuration Update message, MME Configuration Transfer message, E-RAB Setup Request message, or UE Context Modification message.
- the communication control device 30 controls parameters set in the eNB 21 via the MME 22, but the communication control device 30 sets the eNB 21 by transmitting a message directly to the eNB 21.
- the value of the parameter to be controlled may be controlled.
- the communication control device 30 and the MME 22 are described as different devices, but the MME 22 may have a function executed in the communication control device 30. That is, the communication control device 30 and the MME 22 may be an integrated device.
- Inactivity Timer is used as a parameter set by the eNB 21 .
- Inactivity Timer will be specifically described with reference to FIG.
- the horizontal axis in FIG. 4 indicates time.
- the UE is connected to the eNB 21 for a certain period after transmitting the data.
- the operation of the UE during this period is set to Connected Mode (RRC_Connected).
- RRC_Idle the operation of the UE during a period in which the UE is not connected to the eNB 21 is IdleIMode (RRC_Idle).
- Inactivity Timer (length). That is, Inactivity Timer can be considered as the connection maintenance time in the UE after completion of data transmission / reception.
- the communication control device 30 receives a message indicating the radio resource usage status transmitted from the eNB 21 (S21).
- the parameter control unit 32 determines whether or not the ratio of the control data (C-Plane) is equal to or greater than a threshold value (S22). If the parameter control unit 32 determines that the control data ratio is not equal to or greater than the threshold value, the parameter control unit 32 ends the process.
- the ratio of the control data is not equal to or greater than the threshold value, it can be estimated that the increase in the control data does not affect the user data throughput. Therefore, in such a case, in order to maintain the amount of control data generated between the UE and the eNB 21, the process is terminated so as not to change the current parameter setting.
- step S22 when the parameter control unit 32 determines that the ratio of the control data is equal to or greater than the threshold, the parameter control unit 32 determines whether the ratio of the handover control signal is equal to or greater than the threshold in the control data (S23). If the parameter control unit 32 determines that the ratio of the handover control signal is not equal to or greater than the threshold value, the parameter control unit 32 ends the process.
- step S23 when the parameter control unit 32 determines that the ratio of the handover control signal is equal to or greater than the threshold, the parameter control unit 32 transmits a message indicating that the value of the Inactivity Timer (IA timer) in the eNB 21 is changed to a short value to the MME 22. (S24).
- IA timer Inactivity Timer
- the time during which the UE operates in Connected Mode can be shortened. That is, when the value of Inactivity Timer is changed to a short value, the probability that the UE operates in Idle Mode increases.
- the UE operates in Idle Mode handover processing does not occur even when the UE moves to a communication area formed by another base station. Therefore, by changing the value of Inactivity Timer to a short value, occurrence of handover processing can be reduced (suppressed), and as a result, handover control signals can be reduced.
- the handover control signal that can be decreased may be an RRC message such as an RRCConnectionReconfiguration message and an RRCConnectionReconfigurationComplete message transmitted / received between the UE and the eNB, for example. Further, by reducing (suppressing) the occurrence of the handover process, not only signals transmitted / received between the UE and the eNB, but also Handover Request message, Handover Request Ack message, and the like between the eNBs can be reduced.
- the process in FIG. 5 is an effective process in an eNB where handover processes occur all at once, for example, an eNB that includes an area where a train passes as a communication area.
- Steps S31 and S32 are the same as steps S21 and S22 of FIG.
- the parameter control unit 32 determines whether or not the ratio of the connection / disconnection signal is greater than or equal to the threshold in the control data (S33). If the parameter control unit 32 determines that the ratio of the connection / disconnection signal is not equal to or greater than the threshold, the process is terminated. In step S33, if the parameter control unit 32 determines that the ratio of the connection / disconnection signal is equal to or greater than the threshold value, the parameter control unit 32 sends a message to the MME 22 indicating that the value of Inactivity Timer (IA timer) in the eNB 21 is changed to a long value. Transmit (S34).
- IA timer Inactivity Timer
- the value of Inactivity Timer is changed to a long value, the time during which the UE operates in Connected Mode can be lengthened.
- the connection connection / disconnection process does not occur even when the UE starts communication. Therefore, by changing the value of Inactivity Timer to a long value, occurrence of connection connection / disconnection processing can be reduced, and as a result, connection connection / disconnection signals can be decreased.
- connection / disconnection signal may be, for example, an Attach / Detach Request message and an RRC message (for example, RRC Connection Setup, RRC Connection Release).
- the processing in FIG. 6 is an eNB that communicates with a UE that frequently communicates but does not move frequently, for example, an eNB that communicates with a smart meter installed to notify each home periodically of power consumption and the like This is an effective process.
- Steps S41 to S44 in FIG. 7 are the same as steps S21 to S24 in FIG.
- step S43 if the parameter control unit 32 determines that the ratio of the handover control signal is not equal to or greater than the threshold, the parameter control unit 32 determines whether the ratio of the connection / disconnection signal is equal to or greater than the threshold (S45). If the parameter control unit 32 determines that the ratio of the connection / disconnection signal is not equal to or greater than the threshold, the process is terminated.
- step S45 when the parameter control unit 32 determines that the ratio of the connection / disconnection signal is equal to or greater than the threshold value, the parameter control unit 32 sends a message to the MME 22 indicating that the value of Inactivity Timer (IA timer) in the eNB 21 is changed to a long value. Transmit (S46).
- IA timer Inactivity Timer
- step S45 As shown in FIG. 7, by combining the processes in FIGS. 5 and 6, it is possible to determine whether the Inactivity Timer value is shortened or extended in one process.
- the process of S45 is executed after step S43.
- the process of S43 may be executed after step S45.
- the control data generated between the UE and the eNB according to the ratio of radio resources allocated to the control data can be changed to reduce the number.
- the number of radio resources allocated to user data can be increased, so that the influence on the throughput of user data can be suppressed.
- the processing of steps S22, S32, and S42 may be executed.
- the utilization rate of the radio resource may be an instantaneous value or an average value in a predetermined period.
- the usage rate of the radio resource may be, for example, the usage rate (total PRB usage) of PRB (Physical Resource Block).
- the threshold value used for executing the processing of steps S22, S32, and S42 is not limited to 90%, and can be arbitrarily set by an administrator or the like.
- Steps S51 and S52 in FIG. 8 are the same as steps S11 and S12 in FIG.
- step S52 when the communication control apparatus 30 receives the message indicating the usage status of the radio resource transmitted from the eNB 21, the communication control apparatus 30 changes the parameter according to the comparison result between the ratio of the radio resource allocated to the control data and the threshold value.
- the UE to be changed and the changed parameter value are specified, and the specified information is notified to the terminal control server (S53).
- the terminal control server is a device that controls the operation of the UE, and may be a device that controls the communication interval of the UE, for example.
- the terminal control server may be, for example, a server that operates as a Web proxy, or may be an OMA (Open Mobile Alliance) server or the like disposed on an M2M (Machine to Machine) platform.
- OMA Open Mobile Alliance
- the communication control apparatus 30 determines that the ratio of the connection / disconnection signal exceeds the threshold as a result of analyzing the message received in step S52, the communication control apparatus 30 identifies a UE that repeats connection / disconnection frequently. To do. Furthermore, the communication control apparatus 30 transmits the information regarding identified UE to a terminal control server in step S53.
- the terminal control server transmits a message instructing to increase the communication interval, for example, the communication interval determined in TCP, to the plurality of UEs specified in the communication control device 30 (S54).
- the terminal control server can control the operation of the UE by transmitting to the terminal control server the result of the communication control device 30 analyzing the usage status of the radio resources of the eNB 21.
- the connection connection / disconnection signal transmitted from the UE to the eNB 21 can be reduced by controlling the communication interval of the UE to be long.
- the terminal control server has been described to increase the TCP data rate when increasing the communication interval of the UE, for example, it may be controlled to increase the connection at the application level of the UE.
- Steps S61 to S64 in FIG. 9 are the same as steps S11 to S14 in FIG.
- the communication control device 30 determines that the ratio of the handover control signal exceeds the threshold as a result of analyzing the message received in step S62.
- the communication area that is, cell coverage
- the communication areas in the eNBs around the eNB 21 May be reduced.
- the MME 22 may transmit a message instructing to increase transmission power or decrease (shallow) the antenna tilt angle to the eNB 21 that expands the communication area in step S64. Further, in step S65, the MME 22 instructs the eNBs around the eNB 21 to reduce the transmission power or increase (deep) the antenna tilt angle in order to reduce the communication area of the eNBs around the eNB 21. May be sent.
- the communication control apparatus 30 determines that the ratio of the handover control signal is increased in the eNB 21 due to the movement of the mobile station in the communication area formed by the eNB 21, the communication control apparatus 30 reduces the communication area in the eNB 21 and the eNB 21
- the communication area of the neighboring eNBs may be expanded.
- the communication control apparatus 30 controls the eNB that has transmitted the message related to the radio resource usage status and the eNB located in the vicinity thereof, so as to reduce control data between the UE and the eNB. Can be controlled.
- Embodiment 5 Next, information indicating the radio resource usage status in Embodiment 5 of the present invention will be described.
- the eNB 21 mainly transmits a radio resource usage status of the entire apparatus, that is, a message indicating statistical information as the entire apparatus to the communication control apparatus 30 has been described.
- the specific information transmitted to the communication control apparatus 30 when the eNB 21 transmits information indicating the radio resource usage status for each UE to the communication control apparatus 30 will be described.
- the eNB 21 indicates the ratio of C-Plane data and U-Plane data for each UE located in the communication area, the occurrence frequency of C-Plane data, the handover frequency, the moving speed of the UE, or the location information of the UE, Information indicating the radio resource usage status may be transmitted to the communication control device 30.
- the eNB 21 may estimate the handover frequency for each UE from UE history information passed between eNBs at the time of X2 handover.
- the communication control device 30 may adjust the value of Inactivity Timer set for each UE using the information for each UE transmitted from the eNB 21. For example, when using the moving speed of the UE, the communication control device 30 changes the value of the Inactivity Timer of the UE to a short value when the load of the eNB that forms the communication area of the moving destination of the UE is high. You may make it reduce the load accompanying the hand-over process in eNB which forms a communication area. At this time, from the moving speed of the UE, the time for the UE to reach a communication area different from the current time is estimated, and when the UE reaches a different communication area, the value of Inactivity Timer is set so that the UE operates in Idle Mode. You may control.
- the communication control device 30 may specify an eNB or a UE whose parameter is to be changed, using information indicating the radio resource usage status transmitted from a plurality of eNBs including the eNB 21.
- the communication control device 30 may acquire information indicating the radio resource usage status for each cell formed by the eNB 21 from the eNB 21.
- the eNB 21 forms a plurality of cells. Therefore, the eNB 21 can add up the usage status of radio resources for each cell.
- the communication control apparatus 30 may hand over a UE belonging to another cell to a cell with a low ratio of radio resources allocated to control data in a cell formed by the eNB 21.
- the communication control device 30 transmits a message indicating a cell identifier (Cell ID) of a cell that the UE should be a handover target (connection destination) to the eNB 21 and requests the UE to issue a handover instruction according to the instruction. May be.
- Cell ID cell identifier
- the communication control apparatus 30 may receive a message related to the radio resource usage status from a base station of a system using a communication method different from LTE. For example, the communication control apparatus 30 may hand over the UE to a system with a low control data ratio. For example, the communication control apparatus 30 may transmit a message indicating the system (RAT) that the UE should be a handover target (connection destination) to the eNB 21 and request the UE to issue a handover instruction according to the instruction. .
- RAT system
- connection destination connection destination
- the eNB can transmit information indicating various radio resource usage states, such as for each UE or for each cell, to the communication control apparatus 30. Therefore, the communication control apparatus 30 can control to reduce the control data between the UE and the eNB by controlling the parameter for each UE or for each cell, not for each eNB.
- Embodiment 6 Next, an example of control parameters in Embodiment 6 of the present invention will be described.
- the control for changing the parameter set in the eNB or the UE has been mainly described. Parameters that can reduce the data may be changed.
- the communication control device 30 may change the location registration interval (Subscribed Periodic RAU / TAU Timer), which is a parameter managed in the HSS. For example, the amount of control data transmitted from the UE can be reduced by widening the location registration interval of the UE.
- the location registration interval Subscribed Periodic RAU / TAU Timer
- the communication control device 30 changes the location registration area (Tracking ⁇ Area List), intermittent reception interval (UE Specific DRX Parameters), and location registration interval (Subscribed Periodic RAU / TAU Timer), which are parameters managed in the MME. Also good. For example, by widening the location registration area, it is possible to reduce the opportunity for the UE to transmit control data associated with the location registration area change. Moreover, the amount of control data transmitted and received between the UE and the eNB can be reduced by widening the intermittent reception interval.
- parameters in the HSS and the MME can be changed in addition to the parameters in the UE and the eNB.
- the present invention has been described as a hardware configuration, but the present invention is not limited to this.
- the present invention can also realize the processing in the communication control device 30 by causing a CPU (Central Processing Unit) to execute a computer program.
- a CPU Central Processing Unit
- Non-transitory computer readable media include various types of tangible storage media (tangible storage medium).
- Examples of non-transitory computer-readable media include magnetic recording media (eg flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg magneto-optical discs), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable ROM), flash ROM, RAM (Random Access Memory)) are included.
- the program may also be supplied to the computer by various types of temporary computer-readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves.
- the temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
- eNB and MME have been mainly described.
- SGSN may be used instead of MME
- NB that is a base station not supporting LTE is used instead of eNB. May be used.
- Mobile station 11 UE 20 base station 21 eNB 22 MME 30 Communication Control Device 31 Information Acquisition Unit 32 Parameter Control Unit
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Abstract
Description
以下、図面を参照して本発明の実施の形態について説明する。図1を用いて本発明の実施の形態1にかかる通信システムの構成例について説明する。図1の通信システムは、移動局10、基地局20及び通信制御装置30を有している。移動局10は、例えば、携帯電話端末、スマートフォン、タブレット型端末もしくは通信機能を有するパーソナルコンピュータ、等のコンピュータ装置であってもよい。基地局20は、移動局10との間において、制御データ及びユーザデータを送受信するために無線リソースを割り当てる。
・制御データの通信量とユーザデータの通信量の大小関係を示す比較情報
・制御データの通信量とユーザデータの通信量を示すデータ量情報
・制御データの通信量とユーザデータの通信量の差分を示す差分情報。
制御データの通信量とユーザデータの通信量とを用いて定められる、比率情報、比較情報、データ量情報及び差分情報を含む情報を通信情報とする。
続いて、図2を用いて本発明の実施の形態2にかかる通信システムの構成例について説明する。図2の通信システムは、UE(User Equipment)11、eNB(eNodeB)21、MME(Mobility Management Entity)22及び通信制御装置30を有している。
(1)AS RRCレイヤのSignaling
(2)AS RRCレイヤのSignalingとNASレイヤのSignaling
(3)NASレイヤのSignaling。
なお、特に断りが無い場合には、以降では(2)を想定して説明する。
続いて、図8を用いて本発明の実施の形態3にかかるパラメータ変更制御処理の流れについて説明する。図8のステップS51及びS52は、図3のステップS11及びS12と同様であるため説明を省略する。
続いて、図9を用いて本発明の実施の形態3にかかるパラメータ変更制御処理の流れについて説明する。図9のステップS61~S64は、図3のステップS11~S14と同様であるため説明を省略する。
続いて、本発明の実施の形態5における、無線リソース利用状況を示す情報について説明する。上述した実施の形態においては、主に、eNB21が、装置全体の無線リソースの利用状況、つまり、装置全体として統計情報を示すメッセージを通信制御装置30へ送信する例について説明した。ここでは、eNB21が、UE毎の無線リソース利用状況を示す情報を通信制御装置30へ送信する際に、通信制御装置30へ送信する具体的な情報について説明する。
続いて、本発明の実施の形態6における、制御パラメータの例について説明する。上述した実施の形態においては、主に、eNBもしくはUEにおいて設定するパラメータを変更する制御について説明したが、HSS及びMMEにおいて設定するパラメータであって、変更することによってUEとeNBとの間の制御データを減少させることができるパラメータを変更してもよい。
11 UE
20 基地局
21 eNB
22 MME
30 通信制御装置
31 情報取得部
32 パラメータ制御部
Claims (13)
- 移動局との間において、制御データ及びユーザデータを送受信するために無線リソースを割り当てる基地局から、前記制御データの通信量と前記ユーザデータの通信量とを用いて定められる通信情報を取得する情報取得手段と、
前記通信情報において前記制御データの通信量が、予め定められた閾値よりも多いことが示されている場合、前記移動局と前記基地局との間において送受信される前記制御データを減少させるように前記移動局に関連するパラメータを変更するパラメータ制御手段と、を備える通信制御装置。 - 前記パラメータ制御手段は、
前記通信情報において、前記制御データの通信量が、が予め定められた前記閾値よりも少ないことが示されている場合、前記移動局と前記基地局との間において送受信される前記制御データを増加もしくは維持させるように前記パラメータを変更する、請求項1に記載の通信制御装置。 - 前記通信情報は、前記制御データの通信量と前記ユーザデータの通信量との比率を示す比率情報、前記制御データの通信量と前記ユーザデータの通信量の大小関係を示す比較情報、前記制御データの通信量と前記ユーザデータの通信量を示すデータ量情報及び前記制御データの通信量と前記ユーザデータの通信量の差分を示す差分情報の少なくとも1つを含む、請求項1又は2に記載の通信制御装置。
- 前記情報取得手段は、
前記比率情報として、前記制御データを送受信するために割り当てられた無線リソースと前記ユーザデータを送受信するために割り当てられた無線リソースとの比率を示す情報を取得する、請求項3に記載の通信制御装置。 - 前記情報取得手段は、
前記基地局が有する無線リソースに対する、前記制御データ及び前記ユーザデータを送受信するために割り当てられた無線リソースの比率を示す情報を取得する、請求項4に記載の通信制御装置。 - 前記情報取得手段は、
前記移動局のハンドオーバに関する制御データの通信量に関する情報、又は、前記移動局と前記基地局との間のコネクション制御に関する制御データの通信量に関する情報を取得する、請求項1乃至5のいずれか1項に記載の通信制御装置。 - 前記パラメータ制御手段は、
前記移動局と前記基地局との間において送受信される前記ハンドオーバに関する制御データの通信量を減少させる場合、Inactivity Timerの値を現在設定されている値よりも短い値に変更する、請求項6に記載の通信制御装置。 - 前記パラメータ制御手段は、
前記移動局と前記基地局との間において送受信される前記コネクション制御に関する制御データの通信量を減少させる場合、Inactivity Timerの値を現在設定されている値よりも長い値に変更する、請求項6に記載の通信制御装置。 - 前記パラメータ制御手段は、
前記制御データの通信量に関する情報を送信してきた前記基地局及び前記基地局の周辺に位置する周辺基地局における前記パラメータを変更する、請求項6乃至8のいずれか1項に記載の通信制御装置。 - 前記情報取得手段は、
前記基地局が複数の移動局と通信している場合、前記複数の移動局毎の前記制御データの通信量に関する情報を取得する、請求項6乃至9のいずれか1項に記載の通信制御装置。 - 移動局と、
前記移動局との間において、制御データ及びユーザデータを送受信するために無線リソースを割り当てる基地局と、
前記基地局から、前記制御データの通信量と前記ユーザデータの通信量とを用いて定められる通信情報を取得する情報取得手段と、前記通信情報において前記制御データの通信量が、予め定められた閾値よりも多いことが示されている場合、前記移動局と前記基地局との間において送受信される前記制御データを減少させるように前記移動局に関連するパラメータを変更するパラメータ制御手段と、を有する通信制御装置と、を備える通信システム。 - 移動局との間において、制御データ及びユーザデータを送受信するために無線リソースを割り当てる基地局から、前記制御データの通信量と前記ユーザデータの通信量とを用いて定められる通信情報を取得し、
前記通信情報において前記制御データの通信量が、予め定められた閾値よりも多いことが示されている場合、前記移動局と前記基地局との間において送受信される前記制御データを減少させるように前記移動局に関連するパラメータを変更する、通信制御方法。 - 移動局との間において、制御データ及びユーザデータを送受信するために無線リソースを割り当てる基地局から、前記制御データの通信量と前記ユーザデータの通信量とを用いて定められる通信情報を取得し、
前記通信情報において前記制御データの通信量の割合が、予め定められた閾値よりも多いことが示されている場合、前記移動局と前記基地局との間において送受信される前記制御データを減少させるように前記移動局に関連するパラメータを変更することをコンピュータに実行させるプログラムを格納した非一時的なコンピュータ可読媒体。
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