JP6456018B2 - Network device, wireless communication system, and communication control method - Google Patents

Description

  The present invention relates to a network device, a wireless communication system, and a communication control method for transitioning a connection between a wireless terminal and a core network to a preservation state.

  In the 3rd Generation Partnership Project (3GPP), in order to make effective use of radio resources, if the no-communication state between the radio terminal and the core network continues for a certain time or longer, the wireless connection is maintained while maintaining the connection in the core network. A reservation function for releasing only a wireless connection including a section is defined (for example, Non-Patent Document 1).

  FIG. 1 is a diagram illustrating a typical wireless connection release state by the preservation function. As shown in FIG. 1, the wireless terminal (MS) connects to the Application Server (AS) via the Radio Network Controller (RNC), Serving GPRS Support Node (SGSN), and Gateway GPRS Support Node (GGSN). Specifically, a PDP context) is set, and packets are transmitted and received using the connection (see the upper part of FIG. 1).

  When the non-communication state between the MS and the AS continues for a certain time or more, the wireless connection (the layer 2 or lower) between the MS and the RNC and between the RNC and the SGSN is released (see the lower part of FIG. 1). On the other hand, the connection between SGSN and GGSN, that is, the connection in the core network (and the connection between GGSN and AS) is maintained. For this reason, when resuming communication between MS and AS, it is only necessary to re-establish the wireless connection, shortening the connection time associated with resuming communication while effectively utilizing wireless resources that are more resource-constrained than the core network. Is realized.

  Further, as an extension of such a reservation function, the core network not only monitors the no-communication state, but the wireless terminal actively transitions to the reservation state when the wireless terminal transmits a wireless release request ( Fast Dormancy) is also stipulated.

  Furthermore, in 3GPP Technical Standard (TS) after Release 8, when the core network receives a wireless release request from a wireless terminal, the connection state of the wireless terminal is not changed directly to the reservation state, but “Cell_PCH (cell A function (Network Controlled Fast Dormancy) that transitions to a state called “PCH)” and then transitions to a preservation state under the initiative of the core network is also defined. According to such Network Controlled Fast Dormancy, since the timing of transition to the preservation state can be controlled on the core network side, the amount of signaling and the power consumption of the wireless terminal when frequently communicating can be suppressed.

3GPP TS 23.060 V8.15.0 Subclause 9.2.5 Preservation Procedures, 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; General Packet Radio Service (GPRS); Service description; Stage 2 (Release 8), 3GPP, March 2012

  Incidentally, in recent years, a wide variety of wireless terminals have been introduced, and it is known that the behavior of communication varies greatly depending on the type of wireless terminal. For example, in the case of a smartphone capable of freely installing various applications, communication due to the application is more frequently performed than a conventional general mobile phone terminal.

  Further, in the case of an M2M terminal used for machine-to-machine communication (M2M (Machine-to-Machine)), the communication time (data amount) and frequency of communication are small, and the communication interval is often constant. On the other hand, the introduction of a huge number of M2M terminals is expected in the future.

  However, the conventional preservation function described above has a problem that it is difficult to make a transition to the preservation state at an appropriate timing according to the communication behavior of the wireless terminal.

  Therefore, the present invention has been made in view of such a situation, and a network device, a wireless communication system, and communication control capable of transitioning a wireless terminal to a preservation state at an appropriate timing according to the communication behavior of the wireless terminal The purpose is to provide a method.

  A first feature of the present invention is a reservation in which a wireless terminal maintains a connection in the core network among connections established with a core network via a wireless section and releases only a wireless connection including the wireless section. A network device that makes a transition to a state, the monitoring time determining unit that determines a monitoring time from when the wireless terminal is in a no-communication state to a transition to the reservation state, and determined by the monitoring time determining unit A gist is provided with a preservation processing execution unit that measures the duration of the no-communication state based on the monitoring time, and transitions to the preservation state when the duration exceeds the monitoring time.

  The second feature of the present invention is that only a wireless terminal and a wireless connection including the wireless section are maintained among the connections established by the wireless terminal and the core network via the wireless section. And a network device that transitions to a reservation state in which the terminal is released, wherein the wireless terminal transmits terminal information capable of determining a behavior of communication of the wireless terminal to the network device. The network device includes: a terminal information acquisition unit that acquires the terminal information from the wireless terminal; and the wireless terminal is in a no-communication state based on the terminal information acquired by the terminal information acquisition unit. A monitoring time determining unit for determining a monitoring time from the transition to the preservation state, and the monitoring time A preservation processing execution unit that measures the duration of the no-communication state based on the monitoring time determined by the determining unit, and transitions to the preservation state when the duration exceeds the monitoring time. This is the gist.

  A third feature of the present invention is a reservation in which a wireless terminal maintains a connection in the core network among connections established with the core network via a wireless section and releases only the wireless connection including the wireless section. A network device that makes a transition to a state, a terminal information acquisition unit that acquires terminal information from which the wireless terminal communication behavior can be determined from the wireless terminal, and the terminal information acquired by the terminal information acquisition unit On the basis of the monitoring time determined by the monitoring time determination unit, the monitoring time determination unit for determining the monitoring time from the wireless terminal becoming a non-communication state until the transition to the preservation state When the duration of no communication is measured and the duration exceeds the monitoring time, the preservation status And summarized in that and a preservation process execution unit to transition to.

  A fourth feature of the present invention is a reservation in which a wireless terminal maintains a connection in the core network among connections established with the core network via a wireless section and releases only the wireless connection including the wireless section. A communication control method for transitioning to a state, wherein the network device determines a monitoring time until the wireless terminal transitions to the reservation state after the wireless terminal is in a no-communication state, and the network device determines And measuring the duration of the no-communication state based on the monitoring time, and transitioning to the preservation state when the duration exceeds the monitoring time.

  A fifth feature of the present invention is a reservation in which a wireless terminal maintains a connection in the core network among connections established with the core network via a wireless section and releases only the wireless connection including the wireless section. A communication control method for transitioning to a state, wherein the wireless terminal transmits terminal information capable of determining a behavior of communication of the wireless terminal to a network device, and the network device acquires the wireless terminal from the wireless terminal A step of determining a monitoring time from when the wireless terminal enters a non-communication state to a transition to the preservation state based on terminal information; and the network device determines the non-communication based on the determined monitoring time If the duration of the state is measured and the duration exceeds the monitoring time, the pre-base And summarized in that it comprises the step of transitioning to ® down state.

  According to the features of the present invention, it is possible to provide a network device, a wireless communication system, and a communication control method that can transition a wireless terminal to a preservation state at an appropriate timing according to the communication behavior of the wireless terminal.

It is a figure which shows the releasing state of the typical radio | wireless connection by the conventional preservation function. 1 is an overall schematic configuration diagram of a radio communication system 10 according to an embodiment of the present invention. It is a functional block block diagram of SGSN310 which concerns on embodiment of this invention. FIG. 3 is a functional block configuration diagram of a radio terminal 100A according to the embodiment of the present invention. FIG. 4 is a diagram showing a communication sequence in a case where the connection of the wireless terminal 100A is transitioned to a preservation state under the initiative of the core network 300 according to the embodiment of the present invention. FIG. 6 is a diagram showing a communication sequence in a case where the connection of the wireless terminal 100A is changed to a preservation state based on terminal information transmitted by the wireless terminal 100A according to the embodiment of the present invention. It is a figure which shows the specific example of the conditions which determine the monitoring time until making it change to the preservation state which concerns on embodiment of this invention.

  Next, an embodiment of the present invention will be described. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

  Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

(1) Overall Schematic Configuration of Radio Communication System FIG. 2 is an overall schematic configuration diagram of the radio communication system 10 according to the present embodiment. As shown in FIG. 2, the radio communication system 10 includes a mobile communication system that conforms to the 2G / 3G scheme defined in the 3rd Generation Partnership Project (3GPP), and a mobile communication system that conforms to the Long Term Evolution (LTE) scheme. Consists of. The radio terminal 100A and the radio terminal 100B can execute radio communication via 2G / 3G and LTE mobile communication systems.

  The wireless terminal 100A is a smartphone that can freely install various applications. On the other hand, the wireless terminal 100B is an M2M terminal used for machine-to-machine communication (M2M (Machine-to-Machine)) and is mounted on various meters, vending machines, vehicles, and the like that measure power consumption and gas amount. .

  A 2G / 3G (GPRS) mobile communication system includes a Radio Network Controller 220 (hereinafter RNC 220), a Serving GPRS Support Node 310 (hereinafter SGSN 310), and a Gateway GPRS Support Node 320 (hereinafter GGSN 320).

  An LTE (EPC) mobile communication system includes an eNodeB 210 (hereinafter, eNB 210), a Mobility Management Entity 330 (hereinafter, MME 330), a Serving Gateway 340 (hereinafter, SGW 340), and a PDN Gateway 350 (hereinafter, PGW 350).

  The eNB 210 and the RNC 220 constitute a radio access network 200 (hereinafter referred to as RAN 200). The SGSN 310, GGSN 320, MME 330, SGW 340, and PGW 350 constitute the core network 300. Connected to the core network 300 is an Application Server 400 (hereinafter referred to as AS400) that provides various applications in cooperation with the wireless terminals 100A and 100B.

  In the wireless communication system 10, a preservation function (see 3GPP TS23.060 Subclause 9.2.5) is introduced in order to effectively use wireless resources. Preservation function means that wireless terminals 100A and 100B maintain the connection in the core network 300 among the connections (PDP context and Radio bearer) established with the core network 300 via the wireless section, and wireless including the wireless section The connection, specifically, only the connection between the radio terminals 100A, 100B to SGSN310 is changed to a released state (preservation state).

(2) Functional Block Configuration of Radio Communication System Next, a functional block configuration of the radio communication system 10 will be described. Specifically, the functional block configurations of SGSN 310 and radio terminal 100A will be described.

(2.1) SGSN310
FIG. 3 is a functional block configuration diagram of the SGSN 310. As illustrated in FIG. 3, the SGSN 310 includes a terminal information acquisition unit 311, a condition acquisition unit 313, a monitoring time determination unit 315, and a preservation process execution unit 317.

  The terminal information acquisition unit 311 acquires terminal information capable of determining the communication behavior of the wireless terminal 100A (100B, hereinafter the same). Specifically, the terminal information acquisition unit 311 acquires terminal information included in the connection request from the wireless terminal 100A. More specifically, the terminal information acquisition unit 311 acquires terminal information included in the packet transmission request of the wireless terminal 100A.

  In the present embodiment, the terminal information includes a timer value indicating a duration from when the wireless terminal 100A is in a no-communication state until the wireless connection is released. Further, as the terminal information, a low priority identifier indicating that the wireless terminal 100A has a lower priority than other wireless terminals, specifically, a low access priority indicator (LAPI) may be used. Or as terminal information, you may use the information which shows the classification (smartphone etc.) of 100 A of radio | wireless terminals.

  The condition acquisition unit 313 acquires a condition for determining a monitoring time until the connection with the wireless terminal 100A is shifted to the preservation state. For example, the condition acquisition unit 313 specifies the contract type of the wireless terminal 100A, the Access Point Name (APN) to which the wireless terminal 100A is connected, the terminal type (IMEI, etc.) of the wireless terminal 100A, and the RAN type (3G / LTE, etc.) It can be acquired as a condition.

  FIGS. 7A to 7D show specific examples of conditions for determining the monitoring time until transition to the preservation state. As shown in FIGS. 7A to 7D, different monitoring times are associated with each other according to the above-described contract type, connection APN, terminal type, and RAN type. For example, if the contract type is “M2M contract”, since the communication frequency is low and the communication interval is often constant, a short monitoring time (for example, 2 seconds) is associated. On the other hand, if the “packet amount is unlimited”, the communication frequency is high and the communication interval is often indefinite, so a relatively long monitoring time (for example, 120 seconds) is associated. Further, instead of the contract type, the monitoring time may be determined based on the “core network type”. For example, the core network (EPC) is divided into a core network for general communication and a virtual core network (system) for M2M communication (so-called EPC Overlay), and communication related to M2M is for virtualized M2M communication. It is considered that the monitoring time of communication through the M2M communication system is made different (shortened) from the monitoring time of communication through the core network for general communication.

  The monitoring time determination unit 315 determines the monitoring time from when the wireless terminal 100A enters the non-communication state until the wireless terminal 100A transitions to the preservation state. Specifically, the monitoring time determination unit 315 determines the monitoring time based on the condition acquired by the condition acquisition unit 313. For example, when the condition acquisition unit 313 acquires the contract type of the wireless terminal 100A as “packet amount unlimited”, the monitoring time determination unit 315 sets “120 seconds” as the monitoring time.

  In addition, the monitoring time determination unit 315 can also determine the monitoring time from when the wireless terminal enters the no-communication state until the transition to the preservation state based on the terminal information acquired by the terminal information acquisition unit 311. . Specifically, the monitoring time determination unit 315 determines the monitoring time based on a timer value or LAPI indicating a duration time until the wireless connection is released.

  If it is determined that the communication frequency of the wireless terminal 100A is higher than a predetermined value (for example, once / minute) based on the condition acquired by the condition acquisition unit 313, the monitoring time determination unit 315 sets the monitoring time. Increase (eg, 120 seconds). On the other hand, when it is determined that the communication frequency of the wireless terminal 100A is equal to or less than the predetermined value based on the condition acquired by the condition acquisition unit 313, the monitoring time determination unit 315 determines that the communication frequency is higher than the predetermined value. The monitoring time is shortened (for example, 60 seconds).

  Similarly, the monitoring time determination unit 315 increases the monitoring time when it is determined that the communication frequency of the wireless terminal 100A is higher than a predetermined value based on the terminal information acquired by the terminal information acquisition unit 311. On the other hand, when it is determined that the communication frequency of the wireless terminal 100A is equal to or lower than the predetermined value based on the terminal information acquired by the terminal information acquisition unit 311, the monitoring time determination unit 315 determines that the communication frequency is higher than the predetermined value. The monitoring time is made shorter than when judged.

  The monitoring time determination unit 315 may dynamically change the monitoring time according to a change in communication frequency, or may determine the monitoring time based on a correspondence relationship between a preset communication frequency and the monitoring time. May be.

  The preservation process execution unit 317 measures the duration of the no-communication state based on the monitoring time determined by the monitoring time determination unit 315, and if the duration exceeds the monitoring time, the connection with the wireless terminal 100A is pre-established. Transition to the reservation state. Specifically, the preservation process execution unit 317 determines that the connection established by the wireless terminal 100A with the core network 300 via the wireless section when the duration of the no-communication state exceeds the monitoring time (for example, 120 seconds). Among them, the connection in the core network 300 (and the connection between the GGSN 320 and AS400) is maintained, and only the wireless connection including the wireless section (between the wireless terminals 100A and SGSN310) is released.

(2.2) Wireless terminal 100A
FIG. 4 is a functional block configuration diagram of the wireless terminal 100A. As illustrated in FIG. 4, the wireless terminal 100A includes a terminal information transmission unit 101, a connection processing unit 103, and a preservation process execution unit 105. Note that the wireless terminal 100B also has the same functional block configuration as the wireless terminal 100A.

  The terminal information transmission unit 101 is a network device that configures the core network 300, specifically terminal information (such as a timer value or LAPI indicating a duration until the wireless connection is released) that can determine the communication behavior of the wireless terminal. Is transmitted to SGSN310. Specifically, terminal information transmitting section 101 includes terminal information in a packet transmission request and transmits the request to SGSN 310.

  The connection processing unit 103 executes connection processing with the core network 300. Specifically, the connection processing unit 103 performs connection processing at the RRC layer and connection processing with the AS 400 in response to a request for packet transmission from an application implemented in the wireless terminal 100A, and the wireless terminal 100A to Establish AS400 connection.

  The preservation process execution unit 105, in cooperation with the preservation process execution unit 317 of the SGSN 310, transitions the connection set by the connection processing unit 103 to the preservation state. Specifically, the preservation process execution unit 105 and the preservation process execution unit 317 establish the wireless terminal 100A with the core network 300 via the wireless section based on the terminal information transmitted by the terminal information transmission unit 101. Among the connections, the connection in the core network 300 (and the connection between the GGSN 320 and AS400) is maintained, and only the wireless connection including the wireless section (between the wireless terminals 100A and SGSN310) is released.

(3) Operation of Radio Communication System Next, the operation of the radio communication system 10 will be described. Specifically, the connection of the wireless terminal 100A is predicated based on the operation of causing the core network 300 to lead the connection of the wireless terminal 100A to the preservation state (operation example 1) and the terminal information transmitted by the wireless terminal 100A. An operation (operation example 2) for transitioning to the reservation state will be described.

(3.1) Operation example 1
FIG. 5 shows a communication sequence in the case where the connection of the wireless terminal 100A is shifted to the preservation state under the initiative of the core network 300.

  As shown in FIG. 5, the core network 300 (for example, SGSN 310) holds in advance subscriber information (contract type, connectable APN, etc.) of the wireless terminal 100A (S10). In such a state, the wireless terminal 100A transmits a packet transmission request including the connection destination APN to the core network 300 (S20).

  The core network 300 determines the non-communication state monitoring time based on the reception of the packet transmission request from the wireless terminal 100A (S30). Specifically, the core network 300 determines the monitoring time based on the subscriber information of the wireless terminal 100A and the monitoring time determination conditions as illustrated in FIGS. The core network 300 establishes a connection with the wireless terminal 100A (and connection with the AS 400), specifically, a PDP context based on the reception of the packet transmission request from the wireless terminal 100A (S40). .

  When the core network 300 establishes the connection, the core network 300 transmits a response to the packet transmission request (S50). When the core network 300 transmits the response, the core network 300 starts a measurement timer for monitoring time in a no-communication state (S60). Specifically, the core network 300 monitors transmission / reception of a packet via the connection, and resets the measurement timer when the packet is transmitted / received.

  When the duration of the no-communication state measured by the measurement timer exceeds the monitoring time, the core network 300 maintains the connection in the core network 300 among the connections established by the wireless terminal 100A with the core network 300, Only the wireless connection including the wireless section is released (S70). As a result, the connection of the wireless terminal 100A transitions to the preservation state (S80).

(3.2) Operation example 2
FIG. 6 shows a communication sequence in the case where the connection of the wireless terminal 100A is changed to the preservation state based on the terminal information transmitted by the wireless terminal 100A.

  As shown in FIG. 6, the wireless terminal 100A transmits a packet transmission request including a timer value indicating the duration until the wireless connection is released to the core network 300 (S110). Note that the radio terminal 100A may transmit a packet transmission request including LAPI to the core network 300 instead of the timer value.

  The core network 300 determines the non-communication state monitoring time based on the reception of the packet transmission request from the wireless terminal 100A (S120). Specifically, the core network 300 determines the monitoring time based on a timer value indicating a duration time until the wireless connection is released. For example, when 10 seconds is set as the timer value, the monitoring time is similarly determined as 10 seconds based on the timer value. Alternatively, the core network 300 may extend or shorten the monitoring time instead of the similar monitoring time depending on the congestion status of the core network 300.

  Further, when receiving a packet transmission request including LAPI, the core network 300 determines a monitoring time (2 seconds) based on LAPI and a timer value (for example, 2 seconds) defined in advance. Alternatively, the core network 300 receives a packet transmission request including information indicating the type of the wireless terminal 100A (such as a smartphone) from the wireless terminal 100A instead of the timer value or LAPI indicating the duration, and based on the information The monitoring time may be determined.

  The subsequent processing of S130 to S170 is the same as S40 to S80 of the operation example 1 shown in FIG.

(4) Operation / Effect According to the radio communication system 10, the core network 300 (SGSN310) determines the monitoring time from when the radio terminal becomes the radio terminal 100A (100B, hereinafter the same) until the radio terminal transitions to the preservation state. To do. Furthermore, the core network 300 measures the duration of the no-communication state of the wireless terminal 100A based on the determined monitoring time, and if the duration exceeds the determined monitoring time, the core network 300 pushes the connection of the wireless terminal 100A. Transition to the reservation state.

  For this reason, it is possible to flexibly transition the connection of the wireless terminal to the preservation state according to the type of the wireless terminal (smart phone or M2M terminal), contract details, or the like. That is, the wireless terminal can be shifted to the preservation state at an appropriate timing according to the communication behavior of the wireless terminal. As a result, radio resources can be used more effectively, and the amount of signaling associated with retransmission from the reservation state can be reduced by optimizing the number of times of transition to the reservation state, and the processing load on the core network 300 is also suppressed. Is done.

  In the present embodiment, the monitoring time determination unit 315 can determine the monitoring time based on the condition (see FIG. 7) acquired by the condition acquisition unit 313. Specifically, the monitoring time determination unit 315 increases the monitoring time when it is determined that the communication frequency of the wireless terminal 100A is higher than a predetermined value based on the condition acquired by the condition acquisition unit 313. When it is determined that the communication frequency of the wireless terminal 100A is equal to or lower than the predetermined value, the monitoring time is made shorter than when the communication frequency is determined to be higher than the predetermined value. For this reason, the optimal timing according to the communication behavior of the wireless terminal can be shifted to the preservation state.

  Further, in the present embodiment, the monitoring time determination unit 315 is based on the terminal information acquired by the terminal information acquisition unit 311 (such as a timer value or LAPI indicating a duration until the wireless connection is released) 100A It is possible to determine the monitoring time from when the communication state becomes non-communication until the transition to the preservation state. For this reason, the wireless terminal can transition the wireless terminal to the preservation state at an optimal timing according to the communication behavior of the wireless terminal.

(5) Other Embodiments As described above, the content of the present invention has been disclosed through one embodiment of the present invention. However, it is understood that the description and drawings constituting a part of this disclosure limit the present invention. should not do. From this disclosure, various alternative embodiments will be apparent to those skilled in the art.

  For example, in the above-described embodiment of the present invention, the example in which the SGSN 310 determines the monitoring time and executes the process of transitioning to the preservation state has been described. However, each functional block (terminal information acquisition unit 311 and condition acquisition) included in the SGSN 310 The unit 313, the monitoring time determination unit 315, and the preservation process execution unit 317) may be provided by other network devices constituting the core network 300. For example, the RNC 220 may have the function instead of the SGSN 310. Further, in the case of the LTE system, the eNB 210 or the MME 330 may have the function.

  In the above-described embodiment, the packet transmission request includes information such as the timer value and LAPI indicating the duration until the wireless connection is released. However, instead of the packet transmission request, a location registration request (TAU , RAU).

  In the above-described embodiment, the SGSN 310 includes the condition acquisition unit 313, but the condition acquisition unit 313 is not necessarily required. In this case, the monitoring time determination unit 315 may uniquely determine the corresponding monitoring time based on the subscriber information (for example, contract type) of the wireless terminal 100A (100B).

  Further, the present invention described above may be expressed as follows. A first feature of the present invention is that a wireless terminal (for example, the wireless terminal 100A) maintains a connection in the core network among connections established with the core network via a wireless section, and includes a wireless including the wireless section. A network device (for example, SGSN310) that transitions to a reservation state in which only a connection is released, and a monitoring time determination that determines a monitoring time from when the wireless terminal is in a no-communication state to when the wireless terminal transitions to the preservation state 315 and the monitoring time determined by the monitoring time determination unit, the duration of the no-communication state is measured, and when the duration exceeds the monitoring time, the transition to the preservation state is performed. The gist is provided with a reservation processing execution unit 317.

  In the first aspect of the present invention, the apparatus includes a condition acquisition unit 313 that acquires a condition for determining the monitoring time, and the monitoring time determination unit calculates the monitoring time based on the condition acquired by the condition acquisition unit. You may decide.

  In the second feature of the present invention, when the monitoring time determination unit determines that the communication frequency of the wireless terminal is higher than a predetermined value based on the condition acquired by the condition acquisition unit, When the monitoring time is lengthened and the communication frequency of the wireless terminal is determined to be equal to or less than the predetermined value based on the condition acquired by the condition acquisition unit, the communication frequency is determined to be higher than the predetermined value. The monitoring time may be shorter than the case where it is done.

  The second feature of the present invention is that a wireless terminal (for example, the wireless terminal 100A) and a connection established in the core network among connections established by the wireless terminal via a wireless section are maintained. A wireless communication system 10 including a network device (for example, SGSN 310) that transitions to a reservation state in which only a wireless connection including a wireless section is released, wherein the wireless terminal can determine a communication behavior of the wireless terminal A terminal information transmitting unit 101 configured to transmit terminal information to the network device, the network device acquiring a terminal information acquiring unit 311 that acquires the terminal information from the wireless terminal, and the terminal acquired by the terminal information acquiring unit; Based on the information, supervision from when the wireless terminal is in a no-communication state until it transitions to the preservation state. A monitoring time determination unit 315 that determines a viewing time, and measures the duration of the no-communication state based on the monitoring time determined by the monitoring time determination unit, and when the duration exceeds the monitoring time, The gist of the present invention is to include a preservation processing execution unit 317 that makes a transition to the preservation state.

  In the second aspect of the present invention, the terminal information includes a low priority identifier indicating that the wireless terminal has a lower priority than other wireless terminals, and the monitoring time determination unit includes the low priority identifier. The monitoring time may be determined based on

  In the second aspect of the present invention, when the monitoring time determination unit determines that the communication frequency of the wireless terminal is higher than a predetermined value based on the terminal information acquired by the terminal information acquisition unit. If the communication frequency of the wireless terminal is determined to be less than or equal to the predetermined value based on the terminal information acquired by the terminal information acquisition unit by extending the monitoring time, the communication frequency is greater than the predetermined value. The monitoring time may be shorter than when it is determined that the time is too high.

  A third feature of the present invention is a reservation in which a wireless terminal maintains a connection in the core network among connections established with the core network via a wireless section and releases only the wireless connection including the wireless section. A network device (for example, SGSN310) that transitions to a state, which is acquired by the terminal information acquisition unit 311 that acquires terminal information from which the behavior of communication of the wireless terminal can be determined, and the terminal information acquisition unit Based on the received terminal information, a monitoring time determining unit 315 that determines a monitoring time from when the wireless terminal is in a no-communication state to a transition to the preservation state, and the monitoring time determining unit Measure the duration of the no-communication state based on the monitoring time, and if the duration exceeds the monitoring time, The gist of the present invention is to include a preservation processing execution unit 317 that makes a transition to the preservation state.

  A fourth feature of the present invention is a reservation in which a wireless terminal maintains a connection in the core network among connections established with the core network via a wireless section and releases only the wireless connection including the wireless section. A communication control method for transitioning to a state, wherein the network device determines a monitoring time until the wireless terminal transitions to the reservation state after the wireless terminal is in a no-communication state, and the network device determines And measuring the duration of the no-communication state based on the monitoring time, and transitioning to the preservation state when the duration exceeds the monitoring time.

  A fifth feature of the present invention is a reservation in which a wireless terminal maintains a connection in the core network among connections established with the core network via a wireless section and releases only the wireless connection including the wireless section. A communication control method for transitioning to a state, wherein the wireless terminal transmits terminal information capable of determining a behavior of communication of the wireless terminal to a network device, and the network device acquires the wireless terminal from the wireless terminal A step of determining a monitoring time from when the wireless terminal enters a non-communication state to a transition to the preservation state based on terminal information; and the network device determines the non-communication based on the determined monitoring time If the duration of the state is measured and the duration exceeds the monitoring time, the pre-base And summarized in that it comprises the step of transitioning to ® down state.

  As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

10 ... Wireless communication system
100A, 100B ... Wireless terminal
101 ... Terminal information transmitter
103 ... Connection processing section
105 ... Preservation processing execution part
200 ... RAN
210 ... eNB
220… RNC
300 ... Core network
310 ... SGSN
311 ... Terminal information acquisition unit
313 ... Condition acquisition unit
315 ... Monitoring time determination unit
317 ... Preservation processing execution part
320 ... GGSN
330 ... MME
340 ... SGW
350 ... PGW
400 ... AS

Claims (3)

A wireless terminal,
A network device that maintains a connection in the core network among connections established by the wireless terminal via a wireless section and transitions to a reservation state in which only the wireless connection including the wireless section is released. A wireless communication system comprising:
The wireless terminal includes a terminal information transmission unit that transmits terminal information capable of determining a behavior of communication of the wireless terminal to the network device,
The network device is:
A terminal information acquisition unit for acquiring the terminal information from the wireless terminal;
Based on the terminal information acquired by the terminal information acquisition unit, a monitoring time determination unit that determines a monitoring time from when the wireless terminal is in a no-communication state to transition to the preservation state;
A preservation process execution unit that measures the duration of the no-communication state based on the monitoring time determined by the monitoring time determination unit, and transitions to the preservation state when the duration exceeds the monitoring time And
The terminal information transmission unit transmits the terminal information including terminal type information of the wireless terminal,
Based on the terminal type information acquired by the terminal information acquisition unit, the monitoring time determination unit is configured such that the wireless terminal is an “M2M (Machine-to-Machine) terminal” or “a terminal other than an M2M terminal”. A wireless communication system that determines whether or not the monitoring time for the “M2M terminal” is shorter than the monitoring time for the “terminal other than the M2M terminal”. A network device that maintains a connection in the core network among connections established by a wireless terminal via a wireless section and transitions to a reservation state in which only a wireless connection including the wireless section is released. ,
From the wireless terminal, a terminal information acquisition unit that acquires terminal information that can determine the behavior of communication of the wireless terminal;
Based on the terminal information acquired by the terminal information acquisition unit, a monitoring time determination unit that determines a monitoring time from when the wireless terminal is in a no-communication state to transition to the preservation state;
A preservation process execution unit that measures the duration of the no-communication state based on the monitoring time determined by the monitoring time determination unit, and transitions to the preservation state when the duration exceeds the monitoring time And
The terminal information acquisition unit acquires terminal type information of the wireless terminal,
Based on the terminal type information acquired by the terminal information acquisition unit, the monitoring time determination unit is configured such that the wireless terminal is an “M2M (Machine-to-Machine) terminal” or “a terminal other than an M2M terminal”. A network device that determines whether or not the monitoring time for the “M2M terminal” is shorter than the monitoring time for the “terminal other than the M2M terminal”. A communication control method in which a wireless terminal maintains a connection in the core network among connections established with a core network via a wireless section, and transitions to a reservation state in which only the wireless connection including the wireless section is released. And
A transmitting step in which the wireless terminal transmits terminal information capable of determining a communication behavior of the wireless terminal to a network device;
A determination step of determining a monitoring time from when the wireless terminal is in a no-communication state to when the network device is transitioned to the preservation state, based on the terminal information acquired from the wireless terminal;
The network device measures the duration of the no-communication state based on the determined monitoring time, and includes a transition step for transitioning to the preservation state when the duration exceeds the monitoring time,
In the transmission step, the wireless terminal transmits the terminal information including terminal type information of the wireless terminal,
In the determining step, the network device is a “M2M (Machine-to-Machine) terminal” or “a terminal other than an M2M terminal” based on the terminal type information acquired from the wireless terminal. A communication control method that determines whether or not the monitoring time for the “M2M terminal” is shorter than the monitoring time for the “terminal other than the M2M terminal”.

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