JP5172731B2 - Wireless communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication system 10 for reducing communication interruption caused by time-out in signaling via a femto cell 60. <P>SOLUTION: In the radio communication system 10, a GW 50 measures a response time of the femto cell 60 over the Internet 15 to calculate from the measured response time a correction value of a threshold to be used for determining time-out in signaling via the femto cell 60, and the femto cell 60 determines time-out of signaling using the calculated correction value. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a radio communication system using femtocells.

  Non-Patent Document 1 below discloses a technique called a femtocell that is connected to a mobile wireless communication provider's network via the Internet, communicates with a mobile wireless terminal by wireless communication, and relays the communication of the mobile wireless terminal. It is disclosed. The femtocell is assumed to be installed by a user in a place where radio waves from a base station installed by a mobile radio communication provider do not reach.

3gpp2 S.R.0126-0 “System Requirements for Femto Cell Systems”

  The femtocell performs handoff, paging, and the like, similar to a normal base station. In handoff, paging, and the like, various signaling timer thresholds are used to manage signaling timeouts. The threshold value of each signaling timer is set in advance to an appropriate value by the designer of the wireless communication system according to the situation assumed in each signaling.

  By the way, since it is assumed that the femtocell disclosed in Non-Patent Document 1 is connected to the network of a mobile communication carrier via the Internet, the signal from the femtocell is the traffic of the Internet. May be affected and delayed. Therefore, when the same signaling timer threshold as that of a normal base station provided in the network of a mobile communication carrier is used, the probability that signaling will time out due to the influence of traffic in the Internet increases.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce communication disconnection due to timeout in signaling through a femtocell.

  In order to solve the above-described problem, the wireless communication system of the present invention is configured such that a gateway measures a response time of a femtocell via the Internet, and a threshold value used for time-out determination in signaling via the femtocell from the measured response time. And the femtocell determines signaling timeout using the calculated correction value.

  For example, one embodiment of the present invention includes a plurality of femtocells connected to the Internet, and a gateway provided between the operator network managed by the mobile phone operator and the Internet, and each femtocell includes: A correction value calculation request unit that transmits a correction value calculation request for requesting calculation of a correction value of a timeout threshold used for timeout determination in signaling involving itself via the Internet, and receives and holds the correction value from the gateway And a timeout determination unit that executes a timeout determination after adding the stored correction value to a timeout threshold used for the determination when performing a timeout determination in signaling. A reference value storage unit for storing reference values, and a femtocell When a correction value calculation request is received from the response time measurement unit that measures the response time for the femtocell via the Internet, and the response time measured by the response time measurement unit is greater than the response time in the reference value storage unit If the response time is too long, a correction value is calculated based on the response time measured by the response time measurement unit and the reference value of the response time in the reference value storage unit, and the calculated correction value is the target of the correction value. Provided is a wireless communication system comprising a correction value calculation unit that transmits to a femtocell.

  According to the wireless communication system of the present invention, communication interruption due to timeout can be reduced in signaling via a femtocell.

1 is a system configuration diagram showing a configuration of a wireless communication system 10 according to an embodiment of the present invention. 3 is a block diagram illustrating an example of a functional configuration of a femto information management device 30. FIG. 6 is a diagram illustrating an example of a structure of data stored in a correction value storage unit 31. FIG. It is a block diagram which shows an example of a function structure of GW50. It is a figure which shows an example of the structure of the data stored in the measurement time storage part. 3 is a block diagram illustrating an example of a functional configuration of a femtocell 60. FIG. 4 is a diagram illustrating an example of a structure of data stored in a threshold storage unit 64. FIG. 3 is a block diagram illustrating an example of a functional configuration of a general base station 40. FIG. It is a block diagram which shows an example of a function structure of PCF20 for femtocells. It is a sequence diagram which shows an example of a correction value registration / update process. It is a sequence diagram which shows an example of a handoff process. It is a hardware block diagram which shows an example of the computer 70 which implement | achieves the function of GW50. 2 is a hardware configuration diagram illustrating an example of a computer 80 that realizes the function of the femtocell 60. FIG.

  Embodiments of the present invention will be described below.

  FIG. 1 is a system configuration diagram showing a configuration of a wireless communication system 10 according to an embodiment of the present invention. The wireless communication system 10 includes a general base station PCF (Packet Control Function) 12, a femtocell PCF 20, a femto information management device 30, a general base station 40, a GW (Gateway) 50, and a femtocell 60. The general base station PCF 12, the femtocell PCF 20, the femto information management device 30, the general base station 40, and the GW 50 are connected to the carrier IP network 13 and constitute a RAN (Radio Access Network) 11. The plurality of femtocells 60 are connected to the GW 50 via the Internet 15.

  The GW 50 relays the communication of the terminal 14 via each femtocell 60 to the RAN 11. Note that a firewall may be provided between the GW 50 and the Internet 15, and a firewall function may be provided in the GW 50.

  The general base station PCF 12 communicates with the general base station 40 and the host device in the RAN 11 and controls data communication of the terminal 14 via the general base station 40. The femtocell PCF 20 communicates with each femtocell 60 and the host device, and controls data communication of the terminal 14 via the femtocell 60. The femto information management apparatus 30 stores, for each femtocell 60, a timeout threshold correction value used for timeout determination in signaling related to call control of the terminal 14.

  The GW 50 measures the response time of the femtocell 60 via the Internet 15 when the femtocell 60 is newly connected to the Internet 15 or when a predetermined time has elapsed since the previous correction value was calculated, The correction value of the femtocell 60 is calculated from the measured response time and registered in the femto information management apparatus 30. Each femtocell 60 relays the communication of the terminal 14 to the RAN 11 via the GW 50.

  The femtocell PCF 20, the femto information management device 30, the general base station 40, and the femtocell 60 set the correction value of the femtocell 60 when a communication partner communicates via the femtocell 60 in signaling related to call control. Acquired from the femto information management apparatus 30 and adds the acquired correction value to the timeout threshold used for the timeout determination to determine the timeout.

  FIG. 2 is a block diagram illustrating an example of a functional configuration of the femto information management apparatus 30. The femto information management device 30 includes a correction value storage unit 31 and a correction value management unit 32. For example, as illustrated in FIG. 3, the correction value storage unit 31 stores a correction value 311 for a timeout threshold in signaling via the femtocell 60 in association with the femto ID 310 that identifies each femtocell 60. .

  When the correction value management unit 32 receives a correction value registration request including a femto ID and a correction value from the GW 50 via the provider IP network 13, the correction value management unit 32 associates the correction value with the femto ID and stores a correction value storage unit. 31. Further, when the correction value management unit 32 receives a correction value request including a femto ID from the femtocell PCF 20, the general base station 40, or the GW 50 via the carrier IP network 13, the correction value management unit 32 responds to the femto ID. The correction value to be extracted is extracted from the correction value storage unit 31 and returned to the transmission source of the correction value request.

  FIG. 4 is a block diagram illustrating an example of a functional configuration of the GW 50. The GW 50 includes a reference value storage unit 51, a response time measurement unit 52, a correction value calculation unit 53, and a measurement time storage unit 54.

  The reference value storage unit 51 stores a reference value for response time in advance. In the present embodiment, the reference value for the response time is, for example, 200 milliseconds. For example, as shown in FIG. 5, the measurement time storage unit 54 stores a measurement time 541 obtained by measuring the response time of the femtocell 60 in association with the femto ID 540 that identifies each femtocell 60.

  When the response time measurement unit 52 receives a correction value calculation request from the femtocell 60 via the Internet 15, the response time measurement unit 52 measures the response time of the femtocell 60 via the Internet 15, and calculates the measured response time as a correction value. Send to part 53. Further, when the femto ID is notified from the correction value calculation unit 53, the response time measurement unit 52 measures the response time of the femto cell 60 corresponding to the femto ID, and the measured response time is the correction value calculation unit 53. Send to.

  For example, the response time measurement unit 52 transmits an ICMP echo request to the femtocell 60 whose response time is to be measured, and measures the time until receiving an ICMP echo response to the ICMP echo request as the response time. The response time measurement unit 52 measures the response time, for example, every predetermined time (for example, 1 second) a predetermined number of times (for example, 10 times), and the longest response time among the predetermined number of measurement results is targeted. It is sent to the correction value calculation unit 53 together with the femto ID of the femto cell 60.

  Note that the response time measurement unit 52 determines the measurement time associated with the femto ID of the femtocell 60 for the femtocell 60 that does not send back an ICMP echo response even if the ICMP echo request is transmitted a predetermined number of times or more. Delete from the storage unit 54.

  When the correction value calculation unit 53 receives the response time together with the femto ID from the response time measurement unit 52, the correction value calculation unit 53 refers to the reference value storage unit 51, and the received response time is a reference of the response time in the reference value storage unit 51. It is determined whether it is longer than the value. When the response time received from the response time measurement unit 52 is longer than the reference value of the response time in the reference value storage unit 51, the correction value calculation unit 53 stores the reference value from the response time received from the response time measurement unit 52. A value obtained by subtracting the reference value of the response time of the unit 51 is calculated as the correction value ΔT.

  Then, the correction value calculation unit 53 creates a correction value registration request including the calculated correction value ΔT and the femto ID of the target femtocell 60, and sends the created correction value registration request to the provider IP network 13. The calculated correction value ΔT is transmitted to the femtocell 60 that is the target of the correction value ΔT via the Internet 15.

  Then, the correction value calculation unit 53 refers to the measurement time storage unit 54 and determines whether or not the measurement time is associated with the femto ID of the femto cell 60 that is the target of the correction value ΔT. When the measurement time is not associated with the femto ID, the correction value calculation unit 53 uses the time when the response time is received from the response time measurement unit 52 as the measurement time, and the femto ID of the femto cell 60 that is the target of the correction value ΔT. And stored in the measurement time storage unit 54.

  On the other hand, when the measurement time is already associated with the femto ID, the correction value calculation unit 53 receives the response time from the response time measurement unit 52, and the femto ID of the femto cell 60 that is the target of the correction value ΔT. The measurement time stored in the measurement time storage unit 54 is updated in association with.

  Further, the correction value calculation unit 53 refers to the measurement time storage unit 54 and determines whether or not there is a femto ID associated with the measurement time at which a predetermined time (for example, one day) has elapsed. When the femto ID associated with the measurement time at which the predetermined time has elapsed is present in the measurement time storage unit 54, the correction value calculation unit 53 notifies the response time measurement unit 52 of the femto ID.

  FIG. 6 is a block diagram illustrating an example of a functional configuration of the femtocell 60. The femtocell 60 includes a communication processing unit 61, a timeout determination unit 62, a correction value calculation request unit 63, a threshold storage unit 64, and an antenna 65.

  In the threshold storage unit 64, for example, as illustrated in FIG. 7, a timeout threshold 641 that is a default value of a timeout threshold used for timeout determination in the signaling is stored in advance in association with a signaling ID 640 that identifies each signaling. ing.

  The correction value calculation request unit 63 transmits a correction value calculation request to the GW 50 via the Internet 15 when the femtocell 60 is connected to the Internet 15. The communication processing unit 61 communicates with the terminal 14 via the antenna 65, and relays communication of the terminal 14 to the RAN 11 via the Internet 15 and the GW 50. In addition, when performing a timeout determination in signaling via the Internet 15, the communication processing unit 61 notifies the timeout determination unit 62 of the timeout determination start together with the signaling ID, and whether the timeout determination unit 62 has notified that the timeout has occurred. Determine whether or not.

  If the timeout determination unit 62 notifies that the target signaling has timed out before the target signaling ends, the communication processing unit 61 performs subsequent processing assuming that the target signaling has timed out. On the other hand, when the target signaling is completed before the timeout determination unit 62 is notified that the timeout has occurred, the communication processing unit 61 notifies the timeout determination unit 62 that the signaling is completed together with the signaling ID.

  When receiving an ICMP echo request from the GW 50 via the Internet 15, the timeout determination unit 62 transmits an ICMP echo response to the GW 50 via the Internet 15. Further, the timeout determination unit 62 holds the correction value notified from the GW 50 via the Internet 15.

  The timeout determination unit 62 starts the internal timer of the femtocell 60 and responds to the signaling ID notified from the communication processing unit 61 when notified of the start of timeout determination together with the signaling ID from the communication processing unit 61. In addition, a value obtained by adding the correction value notified from the GW 50 to the timeout threshold stored in the threshold storage unit 64 is calculated as a new timeout threshold. Then, the timeout determination unit 62 determines whether or not the value of the internal timer has exceeded the newly calculated timeout threshold value.

  If the communication processing unit 61 notifies that the signaling subject to timeout determination has ended before the value of the internal timer exceeds the newly calculated timeout threshold, the timeout determination unit 62 Terminate timeout judgment. On the other hand, if the value of the internal timer exceeds the newly calculated timeout threshold before the communication processing unit 61 is notified that the signaling subject to timeout determination has ended, the timeout determination unit 62 Is notified to the communication processing unit 61, and the timeout determination of the target signaling is ended.

  In this way, in signaling via the Internet 15, it is possible to prevent communication interruption due to timeout by increasing the timeout threshold of the signaling timer. However, during the time-out determination, it is necessary to store information related to waiting communication in the memory. For this reason, if the timeout threshold is set too long, the time for which the memory area of the femtocell 60 is occupied becomes longer, and it is necessary to use a memory with a large capacity, or timeout determinations of a large number of terminals 14 can be performed simultaneously. It may not be possible. For this reason, in this embodiment, the timeout threshold value is not set too long.

  FIG. 8 is a block diagram illustrating an example of a functional configuration of the general base station 40. The general base station 40 includes a communication processing unit 41, a timeout determination unit 42, a threshold storage unit 43, and an antenna 44.

  In the threshold storage unit 43, for example, a timeout threshold is stored in advance in association with the signaling ID with the same data structure as in FIG. The communication processing unit 41 communicates with the terminal 14 via the antenna 44 and relays communication of the terminal 14 to other terminals 14 and the like via the provider IP network 13. In addition, when the communication partner is the terminal 14 belonging to the femtocell 60, the communication processing unit 41 requests the timeout determination unit 42 to perform timeout determination in signaling via the carrier IP network 13.

  More specifically, the communication processing unit 41 starts the timeout determination to the timeout determination unit 42 together with the femto ID of the femtocell 60 to which the communication partner terminal 14 belongs and the signaling ID of the signaling to be subjected to timeout determination. Notification is made, and it is determined whether or not the timeout determination unit 42 has notified that the timeout has occurred.

  If the timeout determination unit 42 is notified that the target signaling has timed out before the target signaling ends, the communication processing unit 41 executes subsequent processing assuming that the target signaling has timed out. On the other hand, when the target signaling is completed before the timeout determination unit 42 is notified that the timeout has occurred, the communication processing unit 41 notifies the timeout determination unit 42 of the completion of signaling together with the signaling ID.

  The timeout determination unit 42 starts the internal timer of the general base station 40 and creates a correction value request including the femto ID when the communication processing unit 41 is notified of the start of timeout determination together with the femto ID and signaling ID. Then, the created correction value request is transmitted to the femto information management apparatus 30 via the provider IP network 13.

  Then, the timeout determination unit 42 receives the correction value of the femto cell 60 corresponding to the femto ID notified from the communication processing unit 41 from the femto information management apparatus 30 and associates it with the signaling ID notified from the communication processing unit 41. Then, a value obtained by adding the correction value received from the femto information management apparatus 30 to the timeout threshold stored in the threshold storage unit 43 is calculated as a new timeout threshold.

  Then, the timeout determination unit 42 determines whether or not the value of the internal timer has exceeded the newly calculated timeout threshold. If the communication processing unit 41 notifies that the signaling subject to timeout determination has ended before the value of the internal timer exceeds the newly calculated timeout threshold value, the timeout determination unit 42 Terminate timeout judgment.

  On the other hand, if the value of the internal timer exceeds the newly calculated timeout threshold before the communication processing unit 41 is notified that the signaling subject to timeout determination has ended, the timeout determination unit 42 Is notified to the communication processing unit 41, and the timeout determination of the target signaling is terminated.

  FIG. 9 is a block diagram illustrating an example of a functional configuration of the femtocell PCF 20. The femtocell PCF 20 includes a communication processing unit 21, a timeout determination unit 22, and a threshold storage unit 23.

  In the threshold storage unit 23, a timeout threshold is stored in advance in association with the signaling ID, for example, in the same data structure as in FIG. The communication processing unit 21 relays communication of the terminal 14 to which at least one of the transmission source and the reception source belongs to the femtocell 60. In addition, prior to relaying communication, the communication processing unit 21 performs the timeout determination together with the femto ID of the femto cell 60 to which the source or destination terminal 14 belongs and the signaling ID of the signaling subject to timeout determination. The timeout determination unit 22 is notified of the start. Then, the communication processing unit 21 determines whether or not the timeout determination unit 22 has notified that the timeout has occurred.

  If the timeout determination unit 22 notifies that the target signaling has timed out before the target signaling ends, the communication processing unit 21 performs subsequent processing assuming that the target signaling has timed out. On the other hand, when the target signaling is completed before the timeout determination unit 22 is notified that the timeout has occurred, the communication processing unit 21 notifies the timeout determination unit 22 of the completion of signaling together with the signaling ID.

  When the timeout determination unit 22 is notified of the start of timeout determination together with the femto ID and signaling ID from the communication processing unit 21, the timeout determination unit 22 starts the internal timer of the femtocell PCF 20 and creates a correction value request including the femto ID. Then, the created correction value request is transmitted to the femto information management apparatus 30 via the provider IP network 13.

  Then, the timeout determination unit 22 receives the correction value of the femto cell 60 corresponding to the femto ID notified from the communication processing unit 21 from the femto information management device 30 and associates the correction value with the signaling ID notified from the communication processing unit 21. Then, a value obtained by adding the correction value received from the femto information management device 30 to the timeout threshold stored in the threshold storage unit 23 is calculated as a new timeout threshold.

  Then, the timeout determination unit 22 determines whether or not the value of the internal timer has exceeded the newly calculated timeout threshold. If the communication processing unit 21 notifies that the signaling for timeout determination has ended before the value of the internal timer exceeds the newly calculated timeout threshold, the timeout determination unit 22 Terminate timeout judgment.

  On the other hand, if the value of the internal timer exceeds the newly calculated timeout threshold before the communication processing unit 21 is notified that the signaling subject to timeout determination has ended, the timeout determination unit 22 Notifying the communication processing unit 21 that the signaling is timed out, and the timeout determination of the target signaling is terminated.

  FIG. 10 is a sequence diagram illustrating an example of correction value registration / update processing executed by the wireless communication system 10.

  First, the femtocell 60 detects that it is connected to the Internet 15 after being activated, and transmits a correction value calculation request to the GW 50 via the Internet 15 (S100). The GW 50 creates an ICMP echo request and transmits it to the femtocell 60 a predetermined number of times via the Internet 15 (S101, S103). The femtocell 60 creates an ICMP echo response and transmits it to the GW 50 via the Internet 15 (S102, S104).

  The GW 50 measures the maximum value of the response time for a predetermined number of times from the transmission of the ICMP echo request to the reception of the ICMP echo response. Then, the GW 50 calculates, as the correction value ΔT, a value obtained by subtracting the response time reference value from the measured response time maximum value when the maximum response time value is longer than a predetermined response time reference value. (S105).

  Then, the GW 50 transmits the calculated correction value ΔT to the target femtocell 60 via the Internet 15 (S106). Further, the GW 50 creates a correction value registration request including the calculated correction value ΔT and the femto ID of the target femtocell 60, and manages the created correction value registration request via the provider IP network 13. It transmits to the apparatus 30 (S107). The femto information management apparatus 30 registers the correction value in the correction value storage unit 31 in association with the femto ID (S108).

  Then, the GW 50 holds the measurement time of the response time of the femtocell 60 (S109), and determines whether a predetermined time has elapsed from the held measurement time. When a predetermined time has elapsed from the stored measurement time (S110), the femto information management devices 30, 50 and the femtocell 60 execute the processes from step S101 to S109 again (S111).

  FIG. 11 is a sequence diagram for explaining a handoff process which is an example of signaling.

  The terminal 14 belongs to the general base station 40 and communicates with the terminal 14 belonging to another general base station 40 via the general base station 40 (S200). Thereafter, the terminal 14 moves near the femtocell 60 and transmits a handoff request to the belonging general base station 40 in order to handoff to the femtocell 60 (S201). The handoff request includes the femto ID of the handoff destination femtocell 60, and the general base station 40 recognizes that the handoff destination base station is the femtocell 60.

  Then, the general base station 40 transmits a correction value request including the femto ID of the handoff destination femtocell 60 to the femto information management apparatus 30 (S202). The femto information management device 30 prepares a correction value corresponding to the femto ID included in the correction value request, creates a correction value response including the prepared correction value, and transmits the response to the general base station 40 (S203).

  Next, the general base station 40 transmits a request for securing a handoff destination channel to the femtocell 60 via the Internet 15, and starts an internal timer of the general base station 40, and a timeout corresponding to the request for securing the handoff destination channel. A value obtained by adding the correction value included in the correction value response to the threshold value is used as a new timeout threshold value, and it is determined whether or not the value of the internal timer exceeds the newly calculated timeout threshold value.

  If the handoff destination channel reservation response is received from the femtocell 60 before the value of the internal timer exceeds the newly calculated timeout threshold (S205), the general base station 40 determines that the signaling has ended normally, A handoff response is transmitted to the terminal 14 (S206).

  FIG. 12 is a hardware configuration diagram illustrating an example of a computer 70 that realizes the functions of the GW 50. The computer 70 includes a central processing unit (CPU) 71, a random access memory (RAM) 72, a read only memory (ROM) 73, a hard disk drive (HDD) 74, a communication interface (I / F) 75, an input / output interface (I). / F) 76 and a media interface (I / F) 77.

  The CPU 71 operates based on a program stored in the ROM 73 or the HDD 74 and controls each part. The ROM 73 stores a boot program executed by the CPU 71 when the computer 70 is started up, a program depending on the hardware of the computer 70, and the like.

  The HDD 74 stores a program executed by the CPU 71. The communication interface 75 receives data from other devices via the carrier IP network 13 or the Internet 15 and sends the data to the CPU 71, and transmits the data generated by the CPU 71 to the other devices via the carrier IP network 13 or the Internet 15. Send to device.

  The CPU 71 controls an output device such as a monitor and an input device such as a keyboard and a mouse via the input / output interface 76. The CPU 71 acquires data from the input device via the input / output interface 76, and outputs the generated data to the output device via the input / output interface 76.

  The media interface 77 reads a program or data stored in the recording medium 78 and provides it to the CPU 71 via the RAM 72. The CPU 71 loads the program from the recording medium 78 onto the RAM 72 via the media interface 77 and executes the loaded program. The recording medium 78 is, for example, an optical recording medium such as a DVD (Digital Versatile Disk) or PD (Phase change rewritable disk), a magneto-optical recording medium such as an MO (Magneto-Optical disk), a tape medium, a magnetic recording medium, or a semiconductor memory. Etc.

  The CPU 71 of the computer 70 implements the functions of the reference value storage unit 51, response time measurement unit 52, correction value calculation unit 53, and measurement time storage unit 54 by executing a program loaded on the RAM 72. The ROM 73 or the HDD 74 stores data in the reference value storage unit 51 and the measurement time storage unit 54.

  The computer 70 reads these programs from the recording medium 78 and executes them. However, as another example, these programs may be acquired from another apparatus via the provider IP network 13 or the Internet 15.

  FIG. 13 is a hardware configuration diagram illustrating an example of a computer 80 that realizes the function of the femtocell 60. The computer 80 includes a central processing unit (CPU) 81, a random access memory (RAM) 82, a read only memory (ROM) 83, a hard disk drive (HDD) 84, a wireless communication device 85, and a communication interface (I / F) 86. Is provided.

  The CPU 81 operates based on a program stored in the ROM 83 or the HDD 84 and controls each unit. The ROM 83 stores a boot program executed by the CPU 81 when the computer 80 is started up, a program depending on the hardware of the computer 80, and the like.

  The HDD 84 stores a program executed by the CPU 81. The wireless communication device 85 wirelessly communicates with the terminal 14 by CDMA or the like via the antenna 65, provides data received from the terminal 14 to the CPU 81, and transmits data generated by the CPU 81 to the terminal 14. The communication interface 86 receives data from other devices via the Internet 15 and sends the data to the CPU 81, and transmits data generated by the CPU 81 to other devices via the Internet 15.

  The CPU 81 of the computer 80 implements the functions of the communication processing unit 61, timeout determination unit 62, correction value calculation request unit 63, and threshold storage unit 64 by executing a program loaded from the HDD 84 onto the RAM 82. The computer 80 reads these programs from the ROM 83 or the HDD 84 and executes them, but as another example, these programs may be acquired from other devices via the Internet 15.

  The embodiment of the present invention has been described above.

  As is clear from the above description, according to the wireless communication system 10 of the present embodiment, communication interruption due to timeout can be reduced in signaling via the femtocell 60.

  In addition, this invention is not limited to above-described embodiment, Many deformation | transformation are possible within the range of the summary.

  For example, in the above-described embodiment, the femtocell PCF 20, the general base station 40, and the femtocell 60 add the correction value acquired from the femto information management device 30 to the timeout threshold in signaling via the femtocell 60. Although timeout determination is performed, the present invention is not limited to this. For example, when the response time of the femtocell 60 measured via the Internet 15 is longer than the reference response time, the GW 50 calculates a value obtained by dividing the measured response time by the reference response time as a correction value. To do.

  Then, the femtocell PCF 20, the general base station 40, and the femtocell 60 may perform timeout determination by multiplying the timeout value by the correction value calculated by the GW 50 in signaling via the femtocell 60. . Even in this case, when the measured response time of the femtocell 60 is longer than the reference response time, the timeout threshold can be increased, so that communication interruption due to timeout can be reduced.

  Further, in the above-described embodiment, when both the source and destination terminals 14 belong to different femtocells 60, each femtocell 60 in signaling has its own correction value and the communication partner's The correction value of the femtocell 60 to which the terminal 14 belongs may be added to the timeout threshold value.

  In the above-described embodiment, the correction value calculation unit 53 of the GW 50 sends a response time measurement to the response time measurement unit 52 for the femtocell 60 after a predetermined time has elapsed from the measurement time registered in the measurement time storage unit 54. Although the remeasurement is executed, when the femtocell 60 is in communication, the remeasurement of the response time may be postponed for a predetermined time or a random time. Thereby, the increase in traffic in the Internet 15 and the information on the processing load of the femtocell 60 can be suppressed.

DESCRIPTION OF SYMBOLS 10 ... Wireless communication system, 11 ... RAN, 12 ... PCF for general base stations, 13 ... Provider IP network, 14 ... Terminal, 15 ... Internet, 20 ... Femto PCF for cells, 21 ... Communication processing unit, 22 ... Timeout determination unit, 23 ... Threshold storage unit, 30 ... Femto information management device, 31 ... Correction value storage unit, 32 ... Correction value management unit, 40 ... general base station, 41 ... communication processing unit, 42 ... timeout determination unit, 43 ... threshold storage unit, 44 ... antenna, 50 ... GW, 51 ... reference value storage unit, 52 ... response time measurement unit, 53 ... correction value calculation unit, 54 ... measurement time storage unit, 60 ... femtocell, 61 ... communication processing unit, 62 ... timeout determination unit, 63 ... correction value calculation required 64, threshold storage unit, 65, antenna, 70, computer, 71 ... CPU, 72 ... RAM, 73 ... ROM, 74 ... HDD, 75 ... Communication interface 76 ... Input / output interface, 77 ... Media interface, 78 ... Recording medium, 80 ... Computer, 81 ... CPU, 82 ... RAM, 83 ... ROM, 84 ... HDD, 85 ... Wireless communication device, 86 ... Communication interface

Claims (5)

Multiple femtocells connected to the Internet;
A gateway provided between a carrier network managed by a mobile phone carrier and the Internet;
Each said femtocell is
A correction value calculation requesting unit for transmitting a correction value calculation request for requesting calculation of a correction value of a timeout threshold value used for determination of timeout in signaling involving itself via the Internet;
When receiving and holding the correction value from the gateway and performing a timeout determination in signaling, a timeout determination unit that performs a timeout determination after adding the stored correction value to a timeout threshold used for the determination And
The gateway is
A reference value storage unit for storing a reference value of response time;
When receiving the correction value calculation request from the femtocell, a response time measuring unit that measures a response time for the femtocell via the Internet;
When the response time measured by the response time measurement unit is longer than the response time in the reference value storage unit, the response time measured by the response time measurement unit and the response time in the reference value storage unit A wireless communication system, comprising: a correction value calculating unit that calculates the correction value based on a reference value and transmits the calculated correction value to a femtocell that is a target of the correction value. The wireless communication system according to claim 1,
The correction value calculation unit
When the response time measured by the response time measurement unit is longer than the response time reference value in the reference value storage unit, the response time reference value in the reference value storage unit is subtracted from the response time measurement value. A wireless communication system, wherein a value is calculated as a correction value ΔT. The wireless communication system according to claim 1 or 2,
The gateway correction value calculation unit includes:
After calculating the correction value, the response time measurement unit is caused to remeasure the response time to the femtocell every predetermined time, and the femtocell correction value is recalculated and recalculated correction. Send the value to the femtocell that is the target of the correction value,
The femtocell timeout determination unit
A wireless communication system, wherein when performing a timeout determination in signaling, a timeout determination is executed after adding the latest correction value received from the gateway to a timeout threshold used for the determination. A wireless communication system according to claim 3,
The correction value calculation unit
A wireless communication system, wherein a recalculation of the correction value is postponed for a predetermined time when a target femtocell is communicating at the timing of the recalculation of the correction value. The wireless communication system according to any one of claims 1 to 4,
A femto information management device connected to the provider network;
A base station connected to the operator network;
A host device connected to the operator network;
The femto information management device
Each femtocell in association with the femto preparative ID identifying a correction value storage section to which the femto cell stores a correction value for the timeout threshold used for determining a timeout in the signaling involved,
When a correction value registration request including a femto ID and a correction value is received from the gateway, the correction value is registered in the correction value storage unit in association with the femto ID, and the femto ID is transmitted from the base station or the host device. when receiving the correction value request including, and a correction value management unit that provides to extract a correction value corresponding to the femto bets I D from the correction value storing unit,
The gateway correction value calculation unit further includes:
When the correction value is calculated, a correction value registration request including the calculated correction value and the femto ID of the femto cell that is the target of the correction value is transmitted to the femto management apparatus,
The base station or the host device is
When communicating with any of the femtocells, a correction value request including the femto ID of the femtocell is transmitted to the femto management apparatus to acquire the correction value of the femtocell, and the correction value is acquired using the acquired correction value. A wireless communication system, characterized by determining a timeout in signaling with a femtocell.

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