JP2020136797A - Mobile unit, relay node, and communication control method - Google Patents

Abstract

To reduce the power consumption of a mobile unit by reducing transmission and reception of periodic information necessary for communication of the mobile unit.SOLUTION: A mobile unit 10 performs mobile communication in a mobile communication network 30, and includes: a message reception unit 11 for receiving a message including information informing a relay node that relays data involved in its own unit and indicating a valid period of the relay node from the mobile communication network 30; a communication unit 12 for establishing a bearer and transmitting and receiving data based on information included in the received message; and a mobile unit-side control unit 13 for requesting suspension of transmission of the message and prohibiting release of the bearer after the elapse of the valid period. When there is transmission data from its own unit after the elapse of the valid period, the message reception unit 11 requests transmission of a message via the bearer, and when there is transmission data to its own unit after the elapse of the valid period, the message reception unit 11 receives a message via the bearer.SELECTED DRAWING: Figure 1

Description

The present invention relates to a mobile device that performs mobile communication in a mobile communication network, a relay node that is included in the mobile communication network and relays data, and a communication control method that is an operation method thereof.

Information related to the IPv6 prefix and default router used by the mobile device for communication in the mobile communication network is notified to the mobile device by an ICMPv6 RA (Router Advertisement) message from the P-GW (PDN Gateway) when the PDN (Packet Data Network) is connected. To. In the RA message, the validity period of the default router or the like is set. The P-GW sends a new RA message to the mobile device within this valid period, so that the mobile device always holds valid information. As a result, the mobile device can continuously communicate. RA messages are usually sent on a regular basis. In EPC (Evolved Packet Core), the periodic transmission interval of RA messages is defined as a time interval of 4.5 hours to 6 hours (see Non-Patent Document 1).

TS29.061

If it is a terminal that constantly communicates, such as a smartphone, sending RA messages at the above intervals does not matter. While terminals such as smartphones are used, the number of IoT (Internet of Things) devices that have mobile communication functions and are battery-powered has increased in recent years due to the reduction in power consumption of terminals due to the evolution of wireless technology. There is. In some cases, IoT devices are required to operate for several to 10 years without battery replacement, and even for regular communication using control signals, which could not be a problem for terminals that can be charged frequently. Reduction is needed. For IoT devices that are trying to reduce power consumption by minimizing regular communication, it is assumed that the power consumption associated with the establishment and release of wireless connection by periodic transmission of RA messages will be a bottleneck in extending battery life. To.

The present invention has been made in view of the above, and is capable of reducing the transmission and reception of periodic information required for communication of a mobile device and reducing the power consumption of the mobile device, a relay node, and communication. The purpose is to provide a control method.

In order to achieve the above object, the mobile device according to the present invention is a mobile device that performs mobile communication in the mobile communication network, and is a relay node that relays data related to the own device from the mobile communication network. A message receiver that receives a message containing information indicating the validity period of the relay node and a bearer in the mobile communication network are established to move based on the information contained in the message received by the message receiver. A communication unit that transmits and receives data via the body communication network, and a mobile unit side control unit that requests the mobile communication network to stop transmitting messages and prohibits the release of bearers after the expiration of the valid period. In preparation, if there is data transmitted from the own unit via the mobile communication network after the expiration of the valid period, the message receiving unit must have the transmitted data from the own unit to the mobile communication network after the expiration of the valid period. Is detected, the mobile communication network is requested to send a message via the bearer established by the communication unit, the message is received from the mobile communication network in response to the request, and the message is moved after the expiration date. When there is data transmitted to the own unit via the body communication network, the message receiving unit receives a message from the mobile communication network via the bearer established by the communication unit, and the communication unit receives the message by the message receiving unit. Sends and receives transmission data based on the information contained in the received message.

In order to achieve the above object, the relay node according to the present invention is a relay node included in the mobile communication network and relays data, and relays data related to the mobile device to the mobile device. Establish a message transmitter that notifies its own node as a relay node and sends a message containing information indicating the validity period of the relay node, and a bearer in the mobile communication network related to the mobile device that transmits the message by the message transmitter. The relay unit that relays data and the mobile unit that transmits the message by the message transmission unit accepts a request to stop transmitting the message to the mobile communication network, stops the transmission of the message to the mobile unit, and has a valid period. The message transmission unit is a relay unit when there is data transmitted from the mobile device via the mobile communication network after the expiration of the valid period, with a relay node side control unit that prohibits the release of the bearer after the lapse of. Receives a request to send a message from a mobile device via a bearer established by, sends a message to the mobile device, and has data sent to the mobile device via the mobile communication network after the expiration date. In this case, the message transmission unit transmits a message to the mobile device via the bearer established by the relay unit, and the relay unit relays the transmission data in response to the transmission of the message by the message transmission unit.

According to the mobile device and the relay node according to the present invention, it is possible to perform communication related to the mobile device without transmitting and receiving a periodic message. In addition, the above can be realized without changing the message itself (for example, without changing the framework of the validity period of the default router set in the RA message). Therefore, according to the mobile device and the relay node according to the present invention, it is possible to reduce the transmission and reception of periodic information required for communication of the mobile device and reduce the power consumption of the mobile device.

By the way, the present invention can be described as an invention of a mobile device and a relay node as described above, and can also be described as an invention of a communication control method which is an operation method thereof as described below. This is a substantially identical invention, only in different categories, and has similar actions and effects.

That is, the communication control method according to the present invention is a communication control method that is an operation method of a mobile device that performs mobile communication in a mobile communication network, and relays data related to the own device from the mobile communication network. In the message receiving step of notifying the relay node and receiving a message including information indicating the validity period of the relay node, and establishing a bearer in the mobile communication network, the information included in the message received in the message receiving step Based on the communication step of transmitting and receiving data via the mobile communication network, and the mobile control step of requesting the mobile communication network to stop sending messages and prohibiting the release of the bearer after the expiration of the valid period. If there is data transmitted from the own device via the mobile communication network after the expiration of the valid period, the data transmitted from the own device to the mobile communication network after the expiration of the valid period is sent in the message receiving step. It detects that there is, requests the mobile communication network to send a message via the bearer established in the communication step, receives the message from the mobile communication network in response to the request, and after the expiration of the validity period. When there is data to be transmitted to the own device via the mobile communication network, the message is received from the mobile communication network via the bearer established in the communication step in the message receiving step, and the message is received in the communication step. Transmission / reception of transmission data is performed based on the information contained in the message received in the step.

Further, the communication control method according to the present invention is a communication control method that is included in a mobile communication network and is an operation method of a relay node that relays data, and relays data related to the mobile device to the mobile device. A message transmission step that notifies the own node as a relay node and sends a message containing information indicating the validity period of the relay node, and a bearer in the mobile communication network related to the mobile device that transmits the message in the message transmission step. In the relay step of establishing and relaying data, and in the message transmission step, a request to stop transmitting a message to the mobile communication network is received from the mobile device that transmits the message, and the transmission of the message to the mobile device is stopped. In the relay node side control step that prohibits the release of the bearer after the expiration of the validity period, and in the relay step in the message transmission step when there is data transmitted from the mobile device via the mobile communication network after the expiration of the validity period. When a request to send a message from a mobile device is received via an established bearer, the message is sent to the mobile device, and there is data to be sent to the mobile device via the mobile communication network after the expiration date. In the message transmission step, a message is transmitted to the mobile device via the bearer established in the relay step, and in the relay step, the transmission data is relayed according to the transmission of the message in the message transmission step.

According to the present invention, it is possible to perform communication related to a mobile device without transmitting and receiving a periodic message. In addition, the above can be realized without changing the message itself. Therefore, according to the present invention, it is possible to reduce the periodic transmission / reception of information required for communication of the mobile device and reduce the power consumption of the mobile device.

It is a figure which shows the structure of the mobile device which concerns on embodiment of this invention, and P-GW which is a relay node which concerns on embodiment of this invention. It is a sequence diagram which shows the process at the time of making a PDN connection executed by the mobile machine which concerns on embodiment of this invention, and P-GW which is a relay node which concerns on embodiment of this invention. It is a sequence diagram which shows the process when time elapses from the PDN connection which is executed by the mobile machine which concerns on embodiment of this invention, and P-GW which is a relay node which concerns on embodiment of this invention. .. It is a sequence diagram which shows the process when the data is transmitted from the mobile device to PDN, which is executed by the mobile device which concerns on embodiment of this invention, and P-GW which is the relay node which concerns on embodiment of this invention. It is a sequence diagram which shows the process when data is transmitted from PDN to a mobile device, which is executed by the mobile device which concerns on embodiment of this invention, and P-GW which is a relay node which concerns on embodiment of this invention. It is a figure which shows the hardware configuration of the mobile device which concerns on embodiment of this invention, and P-GW which is a relay node which concerns on embodiment of this invention.

Hereinafter, embodiments of the mobile device, the relay node, and the communication control method according to the present invention will be described in detail together with the drawings. In the description of the drawings, the same elements are designated by the same reference numerals, and duplicate description will be omitted.

In this embodiment, 4G LTE (Long Term Evolution) will be described as an example as a standard for mobile communication (mobile phone). FIG. 1 shows a mobile device (UE: User Equipment) 10 according to the present embodiment and a P-GW 20 which is a relay node according to the present embodiment. The mobile device 10 is a device that performs mobile communication in the mobile communication network 30. The mobile device 10 is, for example, an IoT device that is attached to or incorporated into various devices and is used for IoT. The mobile device 10 is powered by a battery. As described above, IoT devices are required to operate for several years to 10 years without battery replacement, and reduction of power consumption by communication is required. The mobile device 10 may be a device other than the IoT device. The mobile device 10 may have a function provided by a normal mobile device in addition to the function according to the present embodiment described later.

The P-GW 20 is a packet switch included in the mobile communication network 30, specifically, a packet switch that is a component of the core network of the mobile communication network 30 and is a relay node that relays data related to the mobile device 10. is there. The P-GW 20 is a connection point with the PDN 40 in the mobile communication network 30. Further, the P-GW performs packet transfer to the S-GW described later. That is, the P-GW 20 relays data between the mobile device 10 and the PDN40. The PDN40 is a connection destination network, for example, the Internet. Further, the P-GW 20 assigns an IP address and performs QoS (Quality of Service) control, bearer setting control, etc. in cooperation with PCRF (Policy and Charging Rules Function). The P-GW 20 may have a function provided by a normal mobile device in addition to the function according to the present embodiment described later.

The mobile communication network 30 is a communication network that provides a mobile communication function to the mobile device 10. The mobile communication network 30 has components other than the P-GW 20, and the mobile communication function is provided to the mobile device 10 by operating these components. For example, the mobile communication network 30 includes nodes such as eNodeB, MME (Mobility Management Entity), S-GW (Serving Gateway), and PCRF as these components.

The eNodeB is a base station in the mobile communication network 30. The MME is an exchange that accommodates the eNodeB and provides mobility control, bearer control functions, and the like. The S-GW is a packet switch in the area that accommodates the eNodeB. The PCRF is a logical node that controls QoS for user data transfer and billing. Further, the mobile communication network 30 may include other components.

Subsequently, the functions of the mobile device 10 and the P-GW 20 according to the present embodiment will be described. As shown in FIG. 1, the mobile device 10 according to the present embodiment includes a message receiving unit 11, a communication unit 12, and a mobile device side control unit 13.

The message receiving unit 11 is a functional unit that notifies a relay node that relays data related to the own machine from the mobile communication network 30 and receives a message including information indicating the validity period of the relay node. The message is specifically an RA message. The relay node notified by the RA message is P-GW20, which is the default router of PDN40. The RA message is transmitted from the P-GW 20 when, for example, the mobile device 10 makes a PDN connection (at the time of session establishment, at the time of IP address assignment), which is a connection for transmitting / receiving data to / from the PDN 40.

The PDN connection is performed, for example, when the mobile device 10 performs location registration (attachment) to the mobile communication network 30. When making a PDN connection, the mobile device 10 sends a PDN connection request including an APN (Access Point Name), which is information indicating the PDN of the connection destination stored in advance, to the mobile communication network 30. Send to the network. The PDN connection request transmitted from the mobile device 10 to the mobile communication network is transmitted to the P-GW 20 via the eNodeB, MME and S-GW. Specifically, the PDN connection request transmitted from the mobile device 10 is an ESM_PDN Connectivity Request. The MME receives the ESM_PDN Connectivity Request. When the MME receives the ESM_PDN Connectivity Request, the MME transmits the GTPv2_Create Session Request, which is a PDN connection request in the mobile communication network 30, to the P-GW 20 via the S-GW. Upon receiving the signal, the P-GW 20 transmits a PDN connection request response and also transmits an RA message to the mobile device 10. When the mobile device 10 receives the PDN connection request response, the PDN connection is established.

The RA message transmitted from the P-GW 20 to the mobile device 10 is transmitted to the mobile device 10 via the S-GW and eNodeB. The message receiving unit 11 outputs the received RA message to the communication unit 12.

The message receiving unit 11 can also request the P-GW 20 to transmit an RA message. The message receiving unit 11 transmits an RS (Router Solicitation) message to the P-GW 20 as the request.

The communication unit 12 is a functional unit that establishes a bearer in the mobile communication network 30 and transmits / receives data via the mobile communication network 30 based on the information contained in the RA message received by the message receiving unit 11. .. The communication unit 12 inputs an RA message from the message receiving unit 11.

The RA message contains information indicating P-GW20, which is the default router of PDN40. The communication unit 12 communicates (data transmission / reception with / from PDN40) using P-GW 20 as a default router. In addition, the RA message includes a prefix (IPv6Prefix). The communication unit 12 (mobile device 10) itself generates an Interface ID, and generates an IPv6 address based on the prefix included in the RA message and the generated Interface ID. The communication unit 12 communicates using the generated IPv6 address. The communication unit 12 manages a valid period (Router Lifetime) in which the P-GW 20 (source of RA message) is regarded as a default router, and a valid period (Preferred Lifetime / Valid Lifetime) of the generated IPv6 address. When the validity period expires, the default router or IPv6 address cannot be used, and the communication unit 12 cannot perform communication.

The RA message includes Router Lifetime, Preferred Lifetime, and Valid Lifetime as information relating to the validity period. The Router Lifetime is the validity period of the default router determined by the mobile device 10 by the RA message. In RFC4861, the maximum value that can be set for the Router Lifetime is 65,535 seconds.

The Preferred Lifetime is the time for the mobile device 10 to allow the prefix notified by the RA message as the source address of the IPv6 address at the time of communication. If a new RA message is not received after the recommended validity period, the mobile device 10 attempts to use an address other than the corresponding prefix as the source address during communication. However, if the mobile device 10 does not have another appropriate prefix, the mobile device 10 uses the prefix that has passed the recommended validity period for communication.

Valid Lifetime is the time until the prefix notified by the RA message disappears. If no new RA message is received after the expiration date, the mobile device 10 deletes the address of the corresponding prefix. In RFC4861, the maximum value that can be set for the Preferred Lifetime and the Valid Lifetime is infinity. As described above, the validity period related to the IPv6 address (prefix) can be set to infinity according to the standard. Therefore, in terms of the IPv6 address, once the mobile device 10 receives the RA message, it does not receive a new RA message. Can also communicate.

On the other hand, since the validity period of the default router has an upper limit in the standard, the mobile device 10 cannot communicate after the validity period in terms of the default router. Therefore, the conventional mobile device receives a new RA message before the expiration date of the default router. For example, according to Non-Patent Document 1, P-GW is defined to periodically transmit RA messages at intervals of 4.5 hours to 6 hours. That is, the conventional mobile device receives the RA message on a regular basis. In this embodiment, the RA message used is one recognized by the standard. Therefore, there is an upper limit to the validity period of the default router. In the present embodiment, the transmission and reception of periodic RA messages required for communication of the mobile device 10 are reduced to reduce the power consumption of the mobile device 10.

The communication unit 12 establishes a PDN connection (session) as described above and performs communication. The PDN connection includes a bearer between the mobile device 10 and the P-GW 20. When the data to be transmitted to the PDN 40 (uplink user data) is generated, the communication unit 12 transmits the data to the PDN 40 via the established PDN connection. When the data (downlink user data) is transmitted from the PDN 40 to the mobile device, the communication unit 12 receives the data via the established PDN connection. Transmission and reception of user data between the communication unit 12 and the PDN 40 is performed via the eNodeB, S-GW and P-GW 20 in the mobile communication network 30.

After the expiration date of the default router, the mobile device 10 cannot send and receive data to and from the PDN40, but keeps the PDN connection (bearer) without releasing it, that is, the PDN connection (bearer). ), It is possible to send and receive signals to and from the P-GW 20 via the PDN connection.

The mobile device side control unit 13 is a functional unit that requests the mobile communication network 30 to stop transmitting RA messages and prohibits the release of bearers after the expiration of the valid period of the default router. For example, the mobile device side control unit 13 includes an RA reduction request requesting that the transmission of the RA message be stopped in the PDN connection request transmitted from the mobile device 10 to the mobile communication network 30. Specifically, the mobile device side control unit 13 includes the RA reduction request in the PCO (Protocol Configuration Options) or ePCO of the ESM_PDN Conductivity Request. The PCO is transmitted and transferred in the MME and S-GW on the path between the mobile device 10 and the P-GW 20. If the RA message is not transmitted from the P-GW 20 and received by the mobile device 10 based on the request, the mobile device 10 cannot send and receive data to and from the PDN 40 after the expiration date of the default router. The RA reduction request may be transmitted at a preset timing other than the PDN connection request.

When the mobile communication network 30 requests the mobile communication network 30 to stop transmitting the RA message, the mobile communication unit 13 causes the message receiving unit 11 to stop transmitting the RS message. Since the RS message is not transmitted, the RA message is not transmitted from the P-GW 20 to the mobile device 10 in response to the transmission of the RS message.

When the mobile communication unit 13 requests the mobile communication network 30 to stop transmitting the RA message, the mobile communication unit 13 prohibits the communication unit 12 from releasing the PDN connection after the validity period of the default router has elapsed. By controlling the prohibition of release, the mobile device 10 can send and receive signals to and from the P-GW 20. After the expiration of the valid period of the default router, the mobile device 10 transitions to the RA update waiting mode of the next communication trigger as follows.

When there is data (uplink user data) transmitted from the mobile device 10 to the PDN40 via the mobile communication network 30 after the expiration of the validity period of the default router (that is, in the RA update waiting mode of the next communication trigger) (uplink communication). (In the case of an opportunity), the transmission data is transmitted as follows. When uplink user data is generated in the mobile device 10, the message receiving unit 11 detects the occurrence of uplink user data and transmits an RA message to the mobile communication network 30 via the PDN connection maintained by the communication unit 12. To request. That is, the message receiving unit 11 transmits an RS message to the P-GW 20 via the PDN connection. At this point, the wireless connection between the mobile device 10 and the mobile communication network 30 is also disconnected, so that the mobile device 10 has a wireless connection with the mobile communication network 30 before transmitting the RS message. Establishment, specifically, processing of UE activation Service Request between eNodeB, MME and S-GW. Further, the communication unit 12 buffers the uplink user data received from the upper layer.

The message receiving unit 11 receives the RA message transmitted from the P-GW 20 in response to the transmission of the RS message. The message receiving unit 11 outputs the received RA message to the communication unit 12. The communication unit 12 transmits uplink user data based on the information included in the RA message received by the message receiving unit 11. That is, the communication unit 12 enables transmission of data to the PDN40 by updating the validity period of the default router with the RA message, and transmits the buffered uplink user data to the PDN40. When a new RA message is received, an IPv6 address may be generated based on the RA message, and the validity period of the IPv6 address may be managed (the same applies to the following).

When there is transmission data (downlink user data) from the PDN 40 to the mobile device 10 via the mobile communication network 30 after the expiration of the validity period of the default router (that is, in the RA update wait mode of the next communication trigger) (downlink communication). In the case of an opportunity), the transmission data is received as follows. In this case, an RA message is transmitted from the P-GW 20 as described later. At this point, the wireless connection between the mobile device 10 and the mobile communication network 30 is also disconnected, so that the mobile device 10 establishes a wireless connection with the mobile communication network 30 before transmitting the RA message. Specifically, the NW activation Service Request process is performed between the eNodeB, the MME, and the S-GW. The message receiving unit 11 receives the RA message transmitted from the P-GW 20. The message receiving unit 11 outputs the received RA message to the communication unit 12. The communication unit 12 receives downlink user data based on the information included in the RA message received by the message receiving unit 11. That is, the communication unit 12 enables reception of data from the PDN 40 by updating the validity period of the default router with the RA message, and receives downlink user data transmitted from the P-GW 20.

Further, as described above, when the expiration date of the default router is updated, the communication unit 12 can transmit transmission data (uplink user data) (for example, Ac of the application layer) to the PDN40. The above is the function of the mobile device 10 according to the present embodiment.

As shown in FIG. 1, the P-GW 20 according to the present embodiment includes a message transmission unit 21, a relay unit 22, and a relay node side control unit 23.

The message transmission unit 21 is a functional unit that notifies the mobile device 10 of its own node 20 as the default router related to the mobile device 10 and transmits an RA message including information indicating the validity period of the default router. For example, the message transmission unit 21 transmits an RA message when the mobile device 10 is connected to the PDN. Specifically, when the mobile device 10 is connected to the PDN, the P-GW 20 receives the PDN connection request (GTPv2_Create Session Request from the S-GW) from the mobile device 10. The P-GW 20 transmits a PDN connection request response to the PDN connection request to the mobile device 10. The PDN connection request response transmitted from the P-GW 20 is transmitted to the mobile device 10 via the S-GW, MME and eNodeB. Specifically, the PDN connection request response transmitted from the P-GW 20 is GTPv2_Create Session Response. The MME receives the GTPv2_Create Session Response via the S-GW. When the MME receives the GTPv2_Create Session Response, the MME transmits an ESM_Activate Defeat EPS Bearer Context Request, which is a PDN connection request response to the mobile device 10, to the mobile device 10. When the mobile device 10 receives the PDN connection request response, the PDN connection is established. Upon receiving the ESM_Activate Defeat EPS Bearer Context Request, the mobile device 10 transmits the response ESM_Activate Defeat EPC Bearer Context Assist to the MME. In the P-GW 20, when the PDN connection request response is transmitted, the message transmission unit 21 transmits the RA message to the mobile device 10.

As will be described later, the message transmission unit 21 is controlled by the relay node side control unit 23 to prohibit transmission of RA messages. When the message transmission unit 21 is not receiving the control, the message transmission unit 21 may periodically transmit an RA message so that the validity period of the default router in the mobile device 10 does not elapse.

The relay unit 22 is a functional unit that establishes a bearer in the mobile communication network 30 related to the mobile device 10 that transmits an RA message by the message transmission unit 21 and relays data. The relay unit 22 establishes a PDN connection (session) related to the mobile device 10 as described above, and relays data between the mobile device 10 and the PDN 40 via the PDN connection.

The relay unit 22 receives data (uplink user data) addressed to the PDN 40 from the mobile device 10 via the PDN connection and transmits the data (uplink user data) to the PDN 40. The relay unit 22 receives data (downlink user data) addressed to the mobile device 10 from the PDN 40 and transmits the data (downlink user data) to the mobile device 10 via the PDN connection.

After the valid period of the default router indicated by the RA message transmitted to the mobile device 10, the relay unit 22 cannot send and receive data to and from the mobile device 10, but release the PDN connection (bearer). That is, by storing the information related to the PDN connection (bearer), it is possible to transmit and receive a signal to and from the mobile device 10 via the PDN connection.

The relay node side control unit 23 receives a request from the mobile device 10 that transmits the RA message by the message transmission unit 21 to stop transmitting the RA message to the mobile communication network 30, and transmits the RA message to the mobile device 10. It is a functional part that suspends and prohibits the release of the bearer after the expiration date of the default router. As described above, the request for canceling the transmission of the RA message is performed, for example, by including the RA reduction request in the PDN connection request transmitted from the mobile device 10 to the P-GW 20. When the relay node side control unit 23 receives the PDN connection request including the RA reduction request by the relay unit 22, the relay node side control unit 23 receives the request for canceling the transmission of the RA message from the mobile device 10. In response to the request, the relay node side control unit 23 causes the message transmission unit 21 to stop the periodic transmission of the RA message to the mobile device 10. However, when PDN is connected, that is, the transmission of the first RA message is not stopped. If the RA message is not transmitted from the P-GW 20 and received by the mobile device 10 based on the request, the P-GW 20 relays data between the mobile device 10 and the PDN 40 after the expiration date of the default router. Cannot be done.

The relay node side control unit 23 holds the last transmission time of the RA message for the mobile device 10 and the validity period of the default router, that is, the scheduled expiration time of the default router. The relay node side control unit 23 prohibits the relay unit 22 from releasing the PDN connection after the expiration date (scheduled expiration time) of the default router for the mobile device 10. By controlling the prohibition of release, the P-GW 20 can send and receive signals to and from the mobile device 10. After the expiration of the valid period of the default router, the P-GW 20 shifts to the RA update waiting mode of the next communication trigger as follows.

When the relay node side control unit 23 newly transmits an RA message from the message transmission unit 21 as described later during the above control, the relay node side control unit 23 holds the RA message for the mobile device 10. Update the last transmission time and the validity period of the default router.

When there is data (uplink user data) transmitted from the mobile device 10 to the PDN40 via the mobile communication network 30 after the expiration of the validity period of the default router (that is, in the RA update waiting mode of the next communication trigger) (uplink communication). (In the case of an opportunity), the transmission data is relayed as follows. When uplink user data is generated in the mobile device 10, the mobile device 10 requests the mobile communication network 30 to transmit an RA message via the PDN connection maintained by the relay unit 22. That is, the mobile device 10 transmits an RS message to the P-GW 20 via the PDN connection. The message transmission unit 21 receives the RS message from the mobile device 10 via the PDN connection, and transmits the RA message to the mobile device 10.

The mobile device 10 receives the RA message and transmits the uplink user data based on the information contained in the received RA message. That is, the mobile device 10 enables the transmission of data to the PDN40 by updating the validity period of the default router according to the RA message, and transmits the user data to the PDN40. The relay unit 22 receives the transmitted user data and transmits it to the PDN 40. That is, the relay unit 22 relays the transmission data in response to the transmission of the RA message by the message transmission unit 21.

When there is transmission data (downlink user data) from the PDN 40 to the mobile device 10 via the mobile communication network 30 after the expiration of the valid period of the default router (that is, in the RA update wait mode of the next communication trigger) (downlink communication). (In the case of an opportunity), the transmission data is relayed as follows. In this case, the relay unit 22 receives the downlink user data from the PDN 40. The message transmission unit 21 detects the reception of the downlink user data and transmits an RA message to the mobile device 10 via the PDN connection maintained by the relay unit 22.

The mobile device 10 receives the RA message and transmits downlink user data based on the information contained in the received RA message. That is, the mobile device 10 enables reception of data from the PDN 40 by updating the validity period of the default router according to the RA message. The relay unit 22 transmits the user data received from the PDN 40 to the mobile device 10. That is, the relay unit 22 relays the transmission data in response to the transmission of the RA message by the message transmission unit 21. The above is the function of the P-GW 20 according to the present embodiment.

It is conceivable that not all P-GWs in the mobile communication network have the above-mentioned functions of the P-GW 20 according to the present embodiment. Therefore, the P-GW may determine whether or not its own node can respond to the RA reduction request received from the mobile device 10 (that is, whether or not the RA message can be reduced). When the P-GW can respond to the RA reduction request, that is, when the P-GW is the P-GW 20 according to the present embodiment, a positive response is made to the RA reduction request and the above-mentioned RA reduction is performed. Do. If the P-GW cannot respond to the RA reduction request, that is, if the P-GW is not the P-GW 20 according to the present embodiment, a negative response is made to the RA reduction request and the RA reduction described above is performed. Absent. In this case, the P-GW transmits a periodic RA message, and the mobile device 10 side also performs processing according to the periodic RA message as in the conventional case. The above affirmative or negative response is included, for example, in the PDN connection request response. Specifically, the PCO (Protocol Configuration Options) of GTPv2_Create Session Response includes information indicating a positive or negative response. The mobile device 10 holds the information.

In this way, negotiations for reducing RA messages may be performed between the mobile device 10 and the P-GW 20. When the negotiation is successful, that is, when the above-mentioned affirmative response is given, the mobile device 10 and the P-GW 20 execute the functions according to the present embodiment described above, and when the negotiation fails, that is, the above-mentioned When a negative response is given, the mobile device 10 and the P-GW 20 execute periodical transmission / reception of RA messages and corresponding functions as in the conventional case.

Subsequently, using the sequence diagrams of FIGS. 2 to 5, a communication control method which is a process (operation method performed by the mobile device 10 and the P-GW 20) executed by the mobile device 10 and the P-GW 20 according to the present embodiment. To explain. First, the process when the PDN connection is performed will be described with reference to the sequence diagram of FIG.

In the mobile device 10, the mobile device side control unit 13 requests the mobile communication network 30 to stop transmitting the RA message. In addition, the communication unit 12 processes the establishment of the PDN connection including the bearer. Specifically, the RA reduction request is included in the PDN connection request transmitted from the mobile device 10 to the P-GW 20 (S01, communication step, mobile device side control step). In the P-GW 20, the relay node side control unit 23 receives a request from the mobile device 10 to stop transmitting the RA message to the mobile communication network 30. In addition, the relay unit 22 processes the establishment of the PDN connection including the bearer. Specifically, the PDN connection request including the RA reduction request transmitted from the mobile device 10 to the P-GW 20 is received (S01, relay step, relay node side control step).

Subsequently, the P-GW 20 determines whether or not it can respond to the RA reduction request (S02). It is determined that the P-GW 20 having the function according to the present embodiment can respond to the RA reduction request, that is, reduce the RA message. In this case, the P-GW 20 gives a positive response to the RA reduction to the mobile device 10. Specifically, this is included in the PDN connection request response transmitted from the P-GW 20 to the mobile device 10 (S03).

It is determined that the P-GW that does not have the function according to the present embodiment cannot respond to the RA reduction request, that is, does not reduce the RA message. In this case, the P-GW gives a negative response to the RA reduction to the mobile device 10. Specifically, this is included in the PDN connection request response transmitted from the P-GW to the mobile device 10 (S03).

The mobile device 10 receives the PDN connection request response. The mobile device 10 holds a response included in the PDN connection request response, that is, information indicating whether or not RA can be reduced (S04). If the above affirmative response is given, the following processing is executed. On the other hand, when the above-mentioned negative response is given, periodical transmission / reception of RA messages and processing corresponding to the transmission / reception are executed as in the conventional case (the illustration and description in this case thereafter are omitted).

Subsequently, in the P-GW 20, the message transmission unit 21 transmits an RA message to the mobile device 10 (S05, message transmission step). In the mobile device 10 to which the RA message is transmitted, the RA message is received by the message receiving unit 11 (S05, message receiving step). Subsequently, the communication unit 12 performs processing according to the RA message. Specifically, it is the setting of the IPv6 address and the default router. By these processes, the PDN connection including the bearer related to the mobile device 10 is established. Further, the mobile device 10 enables communication between the set IPv6 address and the PDN based on the default router or the like. The above is the process when the PDN connection is made.

Subsequently, the processing when time has passed since the PDN connection was made will be described with reference to the sequence diagram of FIG. In the P-GW 20, when the time of the periodic transmission interval of the RA message elapses from the transmission of the RA message (S11), the relay node side control unit 23 controls (S12, the relay node side control step). Specifically, the relay node side control unit 23 controls the message transmission unit 21 to stop transmitting the RA message to the mobile device 10. Due to this control, the RA message is not transmitted from the P-GW 20 to the mobile device 10. Further, the relay node side control unit 23 controls the relay unit 22 to prohibit the release of the PDN connection after the expiration of the valid period of the default router. By this control, the P-GW 20 can send and receive signals to and from the mobile device 10 even after the expiration date of the default router. The timing of control by the relay node side control unit 23 does not necessarily have to be the above timing, but may be any timing at which the above control can be performed. Subsequently, the P-GW 20 transitions to the RA update waiting mode of the next communication trigger (S13).

When the valid period of the default router elapses from the reception of the RA message in the mobile device 10 (S21), the mobile device side control unit 13 performs control (S22, mobile device side control step). Specifically, the mobile device side control unit 13 controls the message receiving unit 11 to stop transmitting the RS message. Due to this control, the RS message is not transmitted from the mobile device 10 to the P-GW 20. Since the RS message is not transmitted from the mobile device 10 to the P-GW 20, the RA message is not transmitted from the P-GW 20 to the mobile device 10 in response to the transmission of the RS message. Further, the mobile device side control unit 13 controls the communication unit 12 to prohibit the release of the PDN connection after the expiration of the valid period of the default router. By this control, the mobile device 10 can send and receive signals to and from the P-GW 20 even after the expiration of the valid period of the default router. The timing of control by the mobile device side control unit 13 does not necessarily have to be the above timing, and may be any timing at which the above control can be performed. Subsequently, the mobile device 10 transitions to the RA update waiting mode of the next communication trigger (S23). After the expiration date of the default router, data cannot be transmitted / received between the mobile device 10 and the PDN40. The above is the process when time has passed since the PDN connection was made.

Subsequently, using the sequence diagram of FIG. 4, this is a process when data is transmitted from the mobile device 10 to the PDN 40 after the mobile device 10 and the P-GW 20 transition to the RA update waiting mode of the next communication trigger. When the uplink user data is generated in the mobile device 10, the message receiving unit 11 detects the occurrence of the uplink user data (S31). Subsequently, the message receiving unit 11 transmits an RS message to the P-GW 20 via the PDN connection maintained by the communication unit 12 (S32, message receiving step). In the P-GW 20, the RS message is received by the message transmission unit 21 (S32, message transmission step). Prior to the transmission of the RS message, the mobile device 10 establishes a wireless connection with the mobile communication network 30, specifically, performs a process of performing a UE activation Service Request.

Subsequently, the message transmission unit 21 transmits the RA message to the mobile device 10 (S33, message transmission step). In the mobile device 10, the message receiving unit 11 receives the RA message (S33, message receiving step). Subsequently, the communication unit 12 performs processing according to the RA message (S34). Specifically, it is an update of the validity period of the default router. By this process, data can be transmitted and received between the mobile device 10 and the PDN 40. Subsequently, the communication unit 12 transmits the uplink user data to the P-GW 20 (S35, communication step). In the P-GW 20, the upstream user data is relayed to the PDN40 by the relay unit 22 (S35, relay step). The above is the process when data is transmitted from the mobile device 10 to the PDN 40.

Subsequently, using the sequence diagram of FIG. 5, this is a process when data is transmitted from the PDN 40 to the mobile device 10 after the mobile device 10 and the P-GW 20 have transitioned to the RA update waiting mode of the next communication trigger. When the downlink user data is transmitted from the PDN40, the P-GW 20 receives the downlink user data by the relay unit 22 (S41, relay step). Subsequently, the message transmission unit 21 transmits an RA message to the mobile device 10 via the PDN connection maintained by the relay unit 22 (S42, message transmission step). Prior to the transmission of the RA message, the mobile device 10 establishes a wireless connection with the mobile communication network 30, specifically, performs a process of NW activation Service Request. In the mobile device 10, the message receiving unit 11 receives the RA message (S42, message receiving step). Subsequently, the communication unit 12 performs processing according to the RA message (S43). Specifically, it is an update of the validity period of the default router. By this process, data can be transmitted and received between the mobile device 10 and the PDN 40.

Subsequently, in the P-GW 20, the downlink user data is transmitted to the mobile device 10 by the relay unit 22 (S45, relay step). In the mobile device 10, downlink user data is received by the communication unit 12 (S45, communication step). The above is the process when data is transmitted from the PDN 40 to the mobile device 10.

According to the present embodiment, communication related to the mobile device 10, specifically, communication between the mobile device 10 and the PDN 40 can be performed without periodically transmitting and receiving RA messages. Further, the above can be realized without changing the RA message itself (for example, without changing the framework of the validity period of the default router set in the RA message). Therefore, according to the present embodiment, it is possible to reduce the transmission and reception of periodic information required for the communication of the mobile device 10 and reduce the power consumption of the mobile device 10. This can bring about the effect of increasing the use of IPv6 in IoT applications that require ultra-low power consumption.

In the above-described embodiment, the request for canceling the transmission of the RA message is uniformly made at a preset timing, but the following configuration may be adopted. The mobile device side control unit 13 may request the mobile communication network 30 to stop transmitting the RA message according to the communication status of the communication unit 12. In this case, the mobile device side control unit 13 does not transmit the RA reduction request when the PDN is established. The mobile device side control unit 13 monitors, for example, the usage status of user data communication after the PDN is established, as the communication status by the communication unit 12. Examples of usage status are the amount of data communication per unit time, the number of wireless connection establishments per unit time, and the like. The mobile device side control unit 13 transmits an RA reduction request when the communication status by the communication unit 12 is so small that periodic transmission / reception of RA messages is not required. For example, the mobile device side control unit 13 transmits an RA reduction request when the value indicating the usage status is equal to or less than a predetermined reference value set in advance. According to this configuration, the power consumption of the mobile device 10 can be further appropriately reduced.

In the present embodiment, the message to be reduced is an RA message, but if it is a message having the same framework, a message other than the RA message may be targeted for reduction. Further, in the present embodiment, the relay node according to the present embodiment is the P-GW 20, but if it is a relay node having the same framework, a relay node other than the P-GW 20 may be used as the relay node according to the present invention. ..

Further, in the present embodiment, 4G LTE has been described as an example, but it may be 2G / 3G or 5G. In the case of 2G / 3G, the MME and S-GW in this embodiment are SGSN (Serving GPRS Support Node), the P-GW 20 in this embodiment is GGSN (Gateway GPRS Support Node), and the eNodeB is RNC (Radio Network Controller). You can read each as. In the case of 5G, the MME in the present embodiment is AMF (Access and Mobility management Function), the S-GW in this embodiment is UPF (User Plane. Function), and the P-GW 20 in this embodiment is SMF (Session Management Function). ), The eNodeB may be read as gNodeB, respectively. In the case of 5G, the signal at the time of establishing PDN may be directly transmitted and received between AMF and SMF.

The block diagram used in the description of the above embodiment shows a block of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by using two or more physically or logically separated devices). , Wired, wireless, etc.) and may be realized using these plurality of devices. The functional block may be realized by combining the software with the one device or the plurality of devices.

Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption. There are broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but only these. I can't. For example, a functional block (constituent unit) for functioning transmission is called a transmitting unit or a transmitter. As described above, the method of realizing each of them is not particularly limited.

For example, the mobile device 10 and the P-GW 20 in one embodiment of the present disclosure may function as a computer that performs the processing of the method of the present disclosure. FIG. 6 is a diagram showing an example of the hardware configuration of the mobile device 10 and the P-GW 20 according to the embodiment of the present disclosure. The mobile device 10 and the P-GW 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. ..

In the following description, the word "device" can be read as a circuit, a device, a unit, or the like. The hardware configuration of the mobile device 10 and the P-GW 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.

For each function of the mobile device 10 and the P-GW 20, the processor 1001 performs an operation by loading predetermined software (program) on the hardware such as the processor 1001 and the memory 1002, and controls the communication by the communication device 1004. It is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

Processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic unit, a register, and the like. For example, each function in the mobile device 10 and the P-GW 20 described above may be realized by the processor 1001.

Further, the processor 1001 reads a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. For example, each function in the mobile device 10 and the P-GW 20 may be realized by a control program stored in the memory 1002 and operating in the processor 1001. Although it has been described that the various processes described above are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunication line.

The memory 1002 is a computer-readable recording medium, and is composed of at least one such as a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). May be done. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can be executed to carry out the method according to the embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, and is, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, or a Blu-ray). It may consist of at least one (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. The storage 1003 may be referred to as an auxiliary storage device. The storage medium described above may be, for example, a database, server or other suitable medium containing at least one of the memory 1002 and the storage 1003.

The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. Communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of. For example, each function in the mobile device 10 and the P-GW 20 described above may be realized by the communication device 1004.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.

Further, the mobile device 10 and the P-GW 20 are hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). It may be configured to include hardware, and a part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these hardware.

Notification of information is not limited to the embodiments / embodiments described in the present disclosure, and may be performed by other methods. For example, information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, etc. It may be carried out by notification information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. Further, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

Each aspect / embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), and 5G (5th generation mobile communication). system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)) )), IEEE 802.16 (WiMAX®), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth®, and other systems that utilize and extend based on these. It may be applied to at least one of the next generation systems. Further, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.

Information and the like can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.

The input / output information and the like may be stored in a specific location (for example, memory), or may be managed using a management table. Input / output information and the like can be overwritten, updated, or added. The output information and the like may be deleted. The input information or the like may be transmitted to another device.

The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the value).

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution. Further, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit notification, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.

Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure may be implemented as an amendment or modification without departing from the purpose and scope of the present disclosure, which is determined by the description of the scope of claims. Therefore, the description of this disclosure is for purposes of illustration only and does not have any restrictive meaning to this disclosure.

Software is an instruction, instruction set, code, code segment, program code, program, subprogram, software module, whether called software, firmware, middleware, microcode, hardware description language, or another name. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted to mean.

Further, software, instructions, information and the like may be transmitted and received via a transmission medium. For example, a website, where the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.). When transmitted from a server, or other remote source, at least one of these wired and wireless technologies is included within the definition of transmission medium.

The information, signals, etc. described in the present disclosure may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.

The terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, the signal may be a message. Further, the component carrier (CC: Component Carrier) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

The terms "system" and "network" used in this disclosure are used interchangeably.

Further, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented. For example, the radio resource may be one indicated by an index.

The names used for the above parameters are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (eg, PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are in any respect limited names. is not.

In the present disclosure, "Base Station (BS)", "Wireless Base Station", "Fixed Station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", " "Access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "cell group" Terms such as "carrier" and "component carrier" can be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

The base station can accommodate one or more (eg, three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH:)). Communication services can also be provided by Remote Radio Head). The term "cell" or "sector" is used in this coverage as part or all of the coverage area of at least one of the base station and base station subsystem providing communication services. Point to.

In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" may be used interchangeably. ..

Mobile stations can be subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless, depending on the trader. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be. It should be noted that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation. For example, at least one of a base station and a mobile station may be an IoT (Internet of Things) device such as a sensor.

Further, the base station in the present disclosure may be read by the user terminal. For example, communication between a base station and a user terminal has been replaced with communication between a plurality of user terminals (for example, it may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In addition, words such as "up" and "down" may be read as words corresponding to communication between terminals (for example, "side"). For example, the uplink, downlink, and the like may be read as side channels. Similarly, the user terminal in the present disclosure may be read as a base station.

The terms "determining" and "determining" used in this disclosure may include a wide variety of actions. "Judgment" and "decision" are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigating (investigating), search (looking up, search, inquiry). It may include (eg, searching in a table, database or another data structure), ascertaining as "judgment" or "decision". Also, "judgment" and "decision" are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (Accessing) (for example, accessing data in memory) may be regarded as "judgment" or "decision". In addition, "judgment" and "decision" mean that "resolving", "selecting", "choosing", "establishing", "comparing", etc. are regarded as "judgment" and "decision". Can include. That is, "judgment" and "decision" may include that some action is regarded as "judgment" and "decision". Further, "judgment (decision)" may be read as "assuming", "expecting", "considering" and the like.

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or connection between two or more elements, and each other. It can include the presence of one or more intermediate elements between two "connected" or "combined" elements. The connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in the present disclosure, the two elements use at least one of one or more wires, cables and printed electrical connections, and, as some non-limiting and non-comprehensive examples, the radio frequency domain. Can be considered to be "connected" or "coupled" to each other using electromagnetic energies having wavelengths in the microwave and light (both visible and invisible) regions.

The phrase "based on" as used in this disclosure does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

Any reference to elements using designations such as "first", "second" as used in the present disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Therefore, references to the first and second elements do not mean that only two elements can be adopted, or that the first element must somehow precede the second element.

When "include", "including" and variations thereof are used in the present disclosure, these terms are as comprehensive as the term "comprising". Is intended. Furthermore, the term "or" used in the present disclosure is intended not to be an exclusive OR.

In the present disclosure, if articles are added by translation, for example a, an and the in English, the disclosure may include the plural nouns following these articles.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". The term may mean that "A and B are different from C". Terms such as "separate" and "combined" may be interpreted in the same way as "different".

10 ... Mobile device, 11 ... Message receiving unit, 12 ... Communication unit, 13 ... Mobile device side control unit, 20 ... P-GW, 21 ... Message transmitting unit, 22 ... Relay unit, 23 ... Relay node side control unit, 30 ... Mobile communication network, 40 ... PDN, 1001 ... Processor, 1002 ... Memory, 1003 ... Storage, 1004 ... Communication device, 1005 ... Input device, 1006 ... Output device, 1007 ... Bus.

Claims (5)

A mobile device that performs mobile communication in a mobile communication network.
A message receiving unit that notifies a relay node that relays data related to its own device from the mobile communication network and receives a message containing information indicating the validity period of the relay node.
A communication unit that establishes a bearer in the mobile communication network and transmits / receives data via the mobile communication network based on the information contained in the message received by the message receiving unit.
It is equipped with a mobile device side control unit that requests the mobile communication network to stop transmitting messages and prohibits the release of bearers after the expiration of the valid period.
When there is data transmitted from the own unit via the mobile communication network after the expiration of the valid period, the message receiving unit has data transmitted from the own unit to the mobile communication network after the expiration of the valid period. Detecting that, the mobile communication network is requested to send a message via the bearer established by the communication unit, and the message is received from the mobile communication network in response to the request.
When there is data transmitted to the own device via the mobile communication network after the expiration of the valid period, the message receiving unit receives a message from the mobile communication network via the bearer established by the communication unit. And
The communication unit is a mobile device that transmits / receives transmission data based on information included in a message received by the message reception unit. The mobile device according to claim 1, wherein the mobile device side control unit requests the mobile communication network to stop transmitting a message according to a communication status by the communication unit. A relay node that is included in the mobile communication network and relays data.
A message transmission unit that notifies the mobile device of its own node as a relay node that relays data related to the mobile device and sends a message containing information indicating the validity period of the relay node.
A relay unit that establishes a bearer in a mobile communication network related to a mobile device that transmits a message by the message transmission unit and relays data.
The message transmitting unit receives a request from the mobile device that transmits the message to the mobile communication network to stop the transmission of the message to the mobile device, stops the transmission of the message to the mobile device, and releases the bearer after the expiration of the valid period. Equipped with a relay node side control unit that is prohibited
When there is data transmitted from the mobile device via the mobile communication network after the expiration of the valid period, the message transmitting unit requests transmission of a message from the mobile device via the bearer established by the relay unit. Accept, send a message to the mobile,
When there is data transmitted to the mobile device via the mobile communication network after the expiration of the valid period, the message transmitting unit transmits a message to the mobile device via the bearer established by the relay unit.
The relay unit is a relay node that relays transmission data in response to transmission of a message by the message transmission unit. It is a communication control method that is an operation method of a mobile device that performs mobile communication in a mobile communication network.
A message reception step of notifying a relay node that relays data related to the own machine from the mobile communication network and receiving a message including information indicating the validity period of the relay node.
A communication step that establishes a bearer in the mobile communication network and transmits / receives data via the mobile communication network based on the information contained in the message received in the message receiving step.
Includes a mobile control step that requests the mobile network to stop sending messages and prohibits the release of bearers after the expiration of the validity period.
When there is data transmitted from the own unit via the mobile communication network after the expiration of the valid period, there is data transmitted from the own unit to the mobile communication network after the expiration of the valid period in the message receiving step. Detecting that, the mobile communication network is requested to send a message via the bearer established in the communication step, and the message is received from the mobile communication network in response to the request.
When there is data transmitted to the own device via the mobile communication network after the expiration of the valid period, in the message receiving step, a message is received from the mobile communication network via the bearer established in the communication step. And
A communication control method in which transmission / reception of transmission data is performed in the communication step based on information included in the message received in the message reception step. It is a communication control method that is an operation method of a relay node that is included in the mobile communication network and relays data.
A message transmission step of notifying the mobile device of its own node as a relay node for relaying data related to the mobile device and transmitting a message including information indicating the validity period of the relay node.
In the message transmission step, a relay step of establishing a bearer in a mobile communication network related to a mobile device that transmits a message and relaying data, and a relay step.
In the message transmission step, the mobile device that transmits the message accepts the request to stop transmitting the message to the mobile communication network, stops the transmission of the message to the mobile device, and releases the bearer after the expiration of the valid period. The relay node side control step to be prohibited and
When there is data transmitted from the mobile device via the mobile communication network after the expiration of the valid period, a request for transmitting a message from the mobile device via the bearer established in the relay step in the message transmission step. Accept, send a message to the mobile,
When there is data transmitted to the mobile device via the mobile communication network after the expiration of the valid period, in the message transmission step, a message is transmitted to the mobile device via the bearer established in the relay step.
A communication control method in which transmission data is relayed in response to transmission of a message in the message transmission step in the relay step.

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